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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	CVBF
Entity Registrant Name	CVB FINANCIAL CORP
Entity Central Index Key	0000354647
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		110,259,842

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 101,714	$ 119,841
Interest-earning balances due from Federal Reserve	354,524	24,536
Total cash and cash equivalents	456,238	144,377
Interest-earning balances due from depository institutions	10,100	17,952
Investment securities available-for-sale, at fair value (with amortized cost of $1,970,076 at March 31, 2018, and $2,078,131 at December 31, 2017)	1,941,592	2,080,985
Investment securities held-to-maturity (with fair value of $776,130 at March 31, 2018, and $819,215 at December 31, 2017)	798,284	829,890
Total investment securities	2,739,876	2,910,875
Investment in stock of Federal Home Loan Bank (FHLB)	17,688	17,688
Loans and lease finance receivables	4,794,983	4,830,631
Allowance for loan losses	(59,935)	(59,585)
Net loans and lease finance receivables	4,735,048	4,771,046
Premises and equipment, net	45,542	46,166
Bank owned life insurance (BOLI)	146,702	146,486
Accrued interest receivable	21,722	22,704
Intangibles	6,507	6,838
Goodwill	116,564	116,564
Other real estate owned (OREO)	0	4,527
Income taxes	35,223	40,046
Other assets	24,950	25,317
Total assets	8,356,160	8,270,586
Deposits:
Noninterest-bearing	4,062,691	3,846,436
Interest-bearing	2,646,744	2,700,417
Total deposits	6,709,435	6,546,853
Customer repurchase agreements	487,277	553,773
Deferred compensation	18,861	18,223
Junior subordinated debentures	25,774	25,774
Other liabilities	47,955	56,697
Total liabilities	7,289,302	7,201,320
Commitments and Contingencies
Stockholders' Equity
Common stock, authorized, 225,000,000 shares without par; issued and outstanding 110,259,046 at March 31, 2018, and 110,184,922 at December 31, 2017	574,225	573,453
Retained earnings	513,484	494,361
Accumulated other comprehensive income, net of tax	(20,851)	1,452
Total stockholders' equity	1,066,858	1,069,266
Total liabilities and stockholders' equity	$ 8,356,160	$ 8,270,586

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Amortized cost	$ 1,970,076	$ 2,078,131
Fair Value, Held-to-maturity	$ 776,130	$ 819,215
Common stock, par value
Common stock, authorized	225,000,000	225,000,000
Common stock, shares issued	110,259,046	110,184,922
Common stock, shares outstanding	110,259,046	110,184,922

Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Loans and leases, including fees	$ 55,196	$ 48,641
Investment securities:
Investment securities available-for-sale	11,868	12,640
Investment securities held-to-maturity	4,765	5,507
Total investment income	16,633	18,147
Dividends from FHLB stock	332	393
Interest-earning deposits with other institutions and federal funds sold	536	267
Total interest income	72,697	67,448
Interest expense:
Deposits	1,525	1,433
Borrowings and customer repurchase agreements	453	429
Junior subordinated debentures	198	153
Total interest expense	2,176	2,015
Net interest income before recapture of provision for loan losses	70,521	65,433
Recapture of provision for loan losses	(1,000)	(4,500)
Net interest income after recapture of provision for loan losses	71,521	69,933
Noninterest income:
Service charges on deposit accounts	4,045	3,727
Trust and investment services	2,157	2,296
Bankcard services	804	765
BOLI income	979	715
Gain on OREO, net	3,540
Other	1,391	1,219
Total noninterest income	12,916	8,722
Noninterest expense:
Salaries and employee benefits	22,314	21,575
Occupancy and equipment	4,192	3,684
Professional services	1,530	1,257
Software licenses and maintenance	1,760	1,561
Marketing and promotion	1,356	1,239
Acquisition related expenses	803	676
Other	3,991	4,125
Total noninterest expense	35,946	34,117
Earnings before income taxes	48,491	44,538
Income taxes	13,578	16,034
Net earnings	34,913	28,504
Other comprehensive income (loss):
Unrealized (loss) gain on securities arising during the period, before tax	(32,170)	424
Less: Income tax benefit (expense) related to items of other comprehensive income	9,511	(178)
Other comprehensive (loss) income, net of tax	(22,659)	246
Comprehensive income	$ 12,254	$ 28,750
Basic earnings per common share	$ 0.32	$ 0.26
Diluted earnings per common share	0.32	0.26
Cash dividends declared per common share	$ 0.14	$ 0.12

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Valley Commerce Bancorp [Member]	Common Stock [Member]	Common Stock [Member] Valley Commerce Bancorp [Member]	Retained Earnings [Member]	Retained Earnings [Member] Valley Commerce Bancorp [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member] Valley Commerce Bancorp [Member]
Beginning balance at Dec. 31, 2016	$ 990,862		$ 531,192		$ 449,499		$ 10,171
Beginning balance, shares at Dec. 31, 2016			108,252
Cumulative adjustment upon adoption of ASU 2016-09	50		$ 116		(66)		0
Repurchase of common stock	(817)		$ (817)		0		0
Repurchase of common stock, shares			(36)
Issuance of common stock for acquisition		$ 37,637		$ 37,637		$ 0		$ 0
Issuance of common stock for acquisition, shares				1,634
Exercise of stock options	2,190		$ 2,190		0		0
Exercise of stock options, shares			240
Shares issued pursuant to stock-based compensation plan	679		$ 679		0		0
Shares issued pursuant to stock-based compensation plan, shares			19
Cash dividends declared on common stock	(13,018)		$ 0		(13,018)		0
Net earnings	28,504		0		28,504		0
Other comprehensive income	246		0		0		246
Ending balance at Mar. 31, 2017	1,046,333		$ 570,997		464,919		10,417
Ending balance, shares at Mar. 31, 2017			110,109
Beginning balance at Dec. 31, 2017	1,069,266		$ 573,453		494,361		1,452
Beginning balance, shares at Dec. 31, 2017			110,185
Cumulative adjustment upon adoption of ASU 2018-02	0		$ 0		(356)		356
Repurchase of common stock	(792)		$ (792)		0		0
Repurchase of common stock, shares			(34)
Exercise of stock options	828		$ 828		0		0
Exercise of stock options, shares			87
Shares issued pursuant to stock-based compensation plan	736		$ 736		0		0
Shares issued pursuant to stock-based compensation plan, shares			21
Cash dividends declared on common stock	(15,434)		$ 0		(15,434)		0
Net earnings	34,913		0		34,913		0
Other comprehensive income	(22,659)		0		0		(22,659)
Ending balance at Mar. 31, 2018	$ 1,066,858		$ 574,225		$ 513,484		$ (20,851)
Ending balance, shares at Mar. 31, 2018			110,259

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends per common share	$ 0.14	$ 0.12

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Interest and dividends received	$ 75,103	$ 71,499
Service charges and other fees received	8,414	8,008
Interest paid	(2,172)	(2,047)
Net cash paid to vendors, employees and others	(41,509)	(20,026)
Income taxes	622	165
Payments to FDIC, loss share agreement	(39)	(450)
Net cash provided by operating activities	40,419	57,149
Cash Flows from Investing Activities
Net change in interest-earning balances from depository institutions	7,852	18,006
Proceeds from repayment of investment securities available-for-sale	95,018	102,426
Proceeds from maturity of investment securities available-for-sale	9,945	5,374
Purchases of investment securities available-for-sale	0	(134,572)
Proceeds from repayment and maturity of investment securities held-to-maturity	30,273	33,411
Purchases of investment securities held-to-maturity	0	(8,895)
Net decrease in loan and lease finance receivables	39,424	92,505
Proceeds from BOLI death benefit	882
Purchase of premises and equipment	(716)	(998)
Proceeds from sales of other real estate owned	8,067	0
Cash acquired from acquisition, net of cash paid	0	28,325
Net cash provided by investing activities	190,745	135,582
Cash Flows from Financing Activities
Net increase in other deposits	175,839	181,485
Net decrease in time deposits	(13,257)	(10,149)
Net decrease in other borrowings	0	(53,000)
Net decrease in customer repurchase agreements	(66,496)	(38,641)
Cash dividends on common stock	(15,425)	(12,991)
Repurchase of common stock	(792)	(817)
Proceeds from exercise of stock options	828	2,190
Net cash provided by financing activities	80,697	68,077
Net increase in cash and cash equivalents	311,861	260,808
Cash and cash equivalents, beginning of period	144,377	121,633
Cash and cash equivalents, end of period	456,238	382,441
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities
Net earnings	34,913	28,504
Adjustments to reconcile net earnings to net cash provided by operating activities:
Gain on sale of other real estate owned	(3,540)
Increase in BOLI	(1,098)	(849)
Net amortization of premiums and discounts on investment securities	3,839	4,614
Accretion of PCI discount	(1,012)	(253)
Recapture of provision for loan losses	(1,000)	(4,500)
Payments to FDIC, loss share agreement	(39)	(450)
Stock-based compensation	736	679
Depreciation and amortization, net	257	558
Change in other assets and liabilities	7,363	28,846
Total adjustments	5,506	28,645
Net cash provided by operating activities	$ 40,419	57,149
Supplemental Disclosure of Non-cash Investing Activities
Issuance of common stock for acquisition		$ 37,637

Business

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business

1.	BUSINESS

The condensed consolidated financial statements include CVB Financial Corp. (referred to herein on an unconsolidated basis as “CVB” and on a consolidated basis as “we,” “our” or the “Company”) and its wholly owned subsidiary, Citizens Business Bank (the “Bank” or “CBB”), after elimination of all intercompany transactions and balances. The Company has one inactive subsidiary, Chino Valley Bancorp. The Company is also the common stockholder of CVB Statutory Trust III. CVB Statutory Trust III was created in January 2006 to issue trust preferred securities in order to raise capital for the Company. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 810, Consolidation, this trust does not meet the criteria for consolidation.

The Company’s primary operations are related to traditional banking activities. This includes the acceptance of deposits and the lending and investing of money through the operations of the Bank. The Bank also provides trust and investment-related services to customers through its CitizensTrust Division. The Bank’s customers consist primarily of small to mid-sized businesses and individuals located in the Inland Empire, Los Angeles County, Orange County, San Diego County, Ventura County, Santa Barbara County, and the Central Valley area of California. The Bank operates 51 banking centers and three trust office locations. The Company is headquartered in the city of Ontario, California.

On February 26, 2018, we entered into a definitive agreement to merge Community Bank with and into Citizens Business Bank. As of December 31, 2017, Community Bank had approximately $3.75 billion in total assets, $2.74 billion in gross loans and $2.86 billion in total deposits. Under the terms of the merger, Community Bank shareholders will have the right to receive, in respect of each share of common stock of Community Bank, 9.4595 shares of CVB common stock and $56.00 per share in cash, subject to any adjustments set forth in the Merger Agreement. The merger transaction is valued at approximately $885.2 million based on CVB’s closing stock price of $23.60 on February 26, 2018. Consummation of the merger is subject to customary closing conditions, including, among others, shareholder and regulatory approvals. The merger is expected to close in the third quarter of 2018.

Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

2.	BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements and notes thereto have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of the results for the full year. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements, accounting policies and financial notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, filed with the SEC. A summary of the significant accounting policies consistently applied in the preparation of the accompanying unaudited condensed consolidated financial statements follows.

Reclassification – Certain amounts in the prior periods’ unaudited condensed consolidated financial statements and related footnote disclosures have been reclassified to conform to the current presentation with no impact on previously reported net income or stockholders’ equity.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

3.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Except as discussed below, our accounting policies are described in Note 3—Summary of Significant Accounting Policies, of our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 as filed with the SEC (“Form 10-K”).

Use of Estimates in the Preparation of Financial Statements — The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. A material estimate that is particularly susceptible to significant change in the near term relates to the determination of the allowance for loan losses. Other significant estimates which may be subject to change include fair value determinations and disclosures, impairment of investments, goodwill, loans, as well as valuation of deferred tax assets.

Adoption of New Accounting Standards — In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. This update to the ASC requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU replaces most existing revenue recognition guidance in U.S. GAAP. In applying the revenue model to contracts within its scope, an entity should apply the following steps: (1) Identify the contract(s) with a customer, (2) Identify the performance obligations in the contract, (3) Determine the transaction price, (4) Allocate the transaction price to the performance obligations in the contract, and (5) Recognize revenue when (or as) the entity satisfies a performance obligation. The standard applies to all contracts with customers except those that are within the scope of other topics in the FASB Codification. The standard also requires significantly expanded disclosures about revenue recognition. In August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers (Topic 606) - Deferral of the Effective Date”, which deferred the effective date of ASU No. 2014-09 to January 1, 2018. The Company adopted the ASU during the first quarter of 2018, as required, using the modified retrospective approach. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements, as substantially all of the Company’s revenues are excluded from the scope of the new standard. Since there was no net income impact upon adoption of this ASU, a cumulative effect adjustment to opening retained earnings was not deemed necessary. See Note 14 Revenue Recognition for more information

In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities”, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The guidance in this ASU among other things, (i) requires equity investments with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the change in fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities are required to apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption. The Company adopted ASU 2016-01 effective January 1, 2018 and it did not have a material impact on the Company’s consolidated financial statements. In accordance with (iv) above, the Company measured the fair value of its loan portfolio at March 31, 2018 using an exit price notion. See Note 9 Fair Value Information.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” The new guidance clarifies the classification within the statement of cash flows for certain transactions, including debt extinguishment costs, zero-coupon debt, contingent consideration related to business combinations, insurance proceeds, equity method distributions and beneficial interests in securitizations. The guidance also clarifies that cash flows with aspects of multiple classes of cash flows or that cannot be separated by source or use should be classified based on the activity that is likely to be the predominant source or use of cash flows for the item. This guidance is effective for fiscal years beginning after December 15, 2017 and will require application using a retrospective transition method. The Company adopted this ASU retrospectively effective January 1, 2018 and it did not have a material impact on the Company’s consolidated financial statements.

In May 2017, the FASB issued ASU No. 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting.” The amendments in ASU 2017-09 provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. An entity should account for the effects of a modification unless all the following are met: (1) The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification. (2) The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified. (3) The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments in ASU No. 2017-09 are effective for annual periods, and interim within those annual reporting periods, beginning after December 15, 2017; early adoption is permitted. The amendments in this ASU should be applied prospectively to an award modified on or after the adoption date. The Company adopted this ASU and it did not have a material impact on the Company’s consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Job Act (“Tax Reform Act”). The amendments in this update also require entities to disclose their accounting policy for releasing income tax effects from accumulated other comprehensive income. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted, and the provisions of the amendment should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Reform Act is recognized. The Company elected to early adopt ASU 2018-02 in the first quarter of 2018 and reclassified $356,000 related to the stranded tax effects from accumulated other comprehensive income to retained earnings within our consolidated statements of stockholders’ equity.

Recent Accounting Pronouncements — In February 2016, FASB issued ASU No. 2016-02, “Leases (Topic 842)”. ASU 2016-02 establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard will replace the current “incurred loss” approach with an “expected loss” model. The new model, referred to as the Current Expected Credit Loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the second step in the goodwill impairment test which requires an entity to determine the implied fair value of the reporting unit’s goodwill. Instead, an entity should recognized an impairment loss if the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, with the impairment loss not to exceed the amount of goodwill allocated to the reporting unit. The standard will be effective for the Company beginning January 1, 2020, with early adoption permitted for goodwill impairment tests performed after January 1, 2017. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 changes the recognition and presentation requirements of hedge accounting and makes certain targeted improvements to simplify the application of the hedge accounting guidance in current GAAP. The amendments in this ASU better align an entity’s financial reporting and risk management activities for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. To meet that objective, the amendments expand and refine hedge accounting for both non-financial and financial risk components and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. ASU No. 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The Company currently does not designate any derivative financial instruments as qualifying hedging relationships, and therefore, does not utilize hedge accounting. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements.

Business Combinations

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Business Combinations

4.	BUSINESS COMBINATIONS

Valley Commerce Bancorp Acquisition

On March 10, 2017, the Company completed the acquisition of Valley Commerce Bancorp (“VCBP”), the holding company for Valley Business Bank (“VBB”), headquartered in the Central Valley area of California. The Company acquired all of the assets and assumed all of the liabilities of VCBP for $23.2 million in cash and $37.6 million in stock. As a result, VBB was merged with the Bank, the principal subsidiary of CVB. The Company believes this transaction serves to further strengthen its presence in the Central Valley area of California. At close, VBB had four branches located in Visalia, Tulare, Fresno, and Woodlake. The systems integration of VCBP and CBB was completed in May 2017. Three of these center locations were consolidated with nearby CBB locations in the third quarter of 2017 and the Company sold the Woodlake branch in the fourth quarter of 2017.

Goodwill of $27.0 million from the acquisition represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired.

The total fair value of assets acquired approximated $405.9 million, which included $28.3 million in cash and cash equivalents net of cash paid, $2.0 million in FHLB stock, $309.7 million in loans and lease finance receivables, $5.3 million in fixed assets, $9.4 million in BOLI, $3.2 million in core deposit intangible assets acquired and $21.0 million in other assets. The total fair value of liabilities assumed was $368.3 million, which included $361.8 million in deposits, and $6.5 million in other liabilities. The assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of March 10, 2017. The assets acquired and liabilities assumed have been accounted for under the acquisition method accounting. The purchase price allocation was finalized in the third quarter of 2017.

We have included the financial results of the business combination in the condensed consolidated statement of earnings and comprehensive income beginning on the acquisition date.

For the three months ended March 31, 2018, the Company did not incur any merger related expenses associated with the VCBP acquisition and incurred $651,000 for the three months ended March 31, 2017.

Investment Securities

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investment Securities

5.	INVESTMENT SECURITIES

The amortized cost and estimated fair value of investment securities are summarized below. The majority of securities held are traded in markets where similar assets are actively traded. Estimated fair values were obtained from an independent pricing service based upon market quotes.


	March 31, 2018
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss		Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,655,742	$	2,158	$	(26,560)	$	1,631,340		84.02%
CMO/REMIC - residential		259,180		644		(4,178)		255,646		13.17%
Municipal bonds		54,416		445		(993)		53,868		2.77%
Other securities		738		-		-		738		0.04%

Total available-for-sale securities	$	1,970,076	$	3,247	$	(31,731)	$	1,941,592		100.00%

Investment securities held-to-maturity:
Government agency/GSE	$	154,194	$	473	$	(2,453)	$	152,214		19.32%
Residential mortgage-backed securities		170,573		-		(3,191)		167,382		21.36%
CMO		221,051		-		(11,522)		209,529		27.69%
Municipal bonds		252,466		760		(6,221)		247,005		31.63%

Total held-to-maturity securities	$	798,284	$	1,233	$	(23,387)	$	776,130		100.00%


	December 31, 2017
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss		Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,747,780	$	11,231	$	(8,102)	$	1,750,909		84.14%
CMO/REMIC - residential		274,634		1,277		(2,082)		273,829		13.16%
Municipal bonds		54,966		774		(244)		55,496		2.66%
Other securities		751		-		-		751		0.04%

Total available-for-sale securities	$	2,078,131	$	13,282	$	(10,428)	$	2,080,985		100.00%

Investment securities held-to-maturity:
Government agency/GSE	$	159,716	$	854	$	(2,134)	$	158,436		19.25%
Residential mortgage-backed securities		176,427		667		(382)		176,712		21.26%
CMO		225,072		-		(8,641)		216,431		27.12%
Municipal bonds		268,675		2,751		(3,790)		267,636		32.37%

Total held-to-maturity securities	$	829,890	$	4,272	$	(14,947)	$	819,215		100.00%

The following table provides information about the amount of interest income earned on investment securities which is fully taxable and which is exempt from regular federal income tax.


	For the Three Months Ended
	March 31,
	2018		2017
	(Dollars in thousands)
Investment securities available-for-sale:
Taxable	$	11,445	$	11,926
Tax-advantaged		423		714

Total interest income from available-for-sale securities		11,868		12,640

Investment securities held-to-maturity:
Taxable		2,878		3,277
Tax-advantaged		1,887		2,230

Total interest income from held-to-maturity securities		4,765		5,507

Total interest income from investment securities	$	16,633	$	18,147

Approximately 89% of the total investment securities portfolio at March 31, 2018 represents securities issued by the U.S government or U.S. government-sponsored enterprises, with the implied guarantee of payment of principal and interest.

The tables below show the Company’s investment securities’ gross unrealized losses and fair value by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018 and December 31, 2017. Management has reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. The unrealized losses on these securities were primarily attributed to changes in interest rates. The issuers of these securities have not, to our knowledge, evidenced any cause for default on these securities. These securities have fluctuated in value since their purchase dates as market rates have fluctuated. However, we have the ability and the intention to hold these securities until their fair values recover to cost or maturity. As such, management does not deem these securities to be Other-Than-Temporarily-Impaired (“OTTI”).


	March 31, 2018
	Less Than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,131,944	$	(15,259)	$	286,313	$	(11,301)	$	1,418,257	$	(26,560)
CMO/REMIC - residential		132,728		(1,662)		67,578		(2,516)		200,306		(4,178)
Municipal bonds		9,363		(156)		13,357		(837)		22,720		(993)

Total available-for-sale securities	$	1,274,035	$	(17,077)	$	367,248	$	(14,654)	$	1,641,283	$	(31,731)

Investment securities held-to-maturity:
Government agency/GSE	$	53,538	$	(262)	$	42,693	$	(2,191)	$	96,231	$	(2,453)
Residential mortgage-backed securities		115,425		(1,649)		51,956		(1,542)		167,381		(3,191)
CMO		-		-		209,529		(11,522)		209,529		(11,522)
Municipal bonds		97,851		(1,714)		57,679		(4,507)		155,530		(6,221)

Total held-to-maturity securities	$	266,814	$	(3,625)	$	361,857	$	(19,762)	$	628,671	$	(23,387)


	December 31, 2017
	Less Than 12 Months					12 Months or Longer					Total
	Fair Value		Gross Unrealized Holding Losses			Fair Value		Gross Unrealized Holding Losses			Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	414,091	$	(1,828	)	$	303,746	$	(6,274	)	$	717,837	$	(8,102	)
CMO/REMIC - residential		95,137		(487	)		71,223		(1,595	)		166,360		(2,082	)
Municipal bonds		946		(4	)		13,956		(240	)		14,902		(244	)

Total available-for-sale securities	$	510,174	$	(2,319	)	$	388,925	$	(8,109	)	$	899,099	$	(10,428	)


Investment securities held-to-maturity:
Government agency/GSE	$	18,950	$	(27	)	$	43,495	$	(2,107	)	$	62,445	$	(2,134	)
Residential mortgage-backed securities		51,297		(188	)		55,306		(194	)		106,603		(382	)
CMO		-		-			216,431		(8,641	)		216,431		(8,641	)
Municipal bonds		32,069		(492	)		66,217		(3,298	)		98,286		(3,790	)

Total held-to-maturity securities	$	102,316	$	(707	)	$	381,449	$	(14,240	)	$	483,765	$	(14,947	)

At March 31, 2018 and December 31, 2017, investment securities having a carrying value of approximately $1.90 billion and $1.91 billion, respectively, were pledged to secure public deposits, short and long-term borrowings, and for other purposes as required or permitted by law.

The amortized cost and fair value of debt securities at March 31, 2018, by contractual maturity, are shown in the table below. Although mortgage-backed and CMO/REMIC securities have contractual maturities through 2057, expected maturities will differ from contractual maturities because borrowers may have the right to prepay such obligations without penalty. Mortgage-backed and CMO/REMIC securities are included in maturity categories based upon estimated average lives which incorporate estimated prepayment speeds.


	March 31, 2018
	Available-for-sale				Held-to-maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(Dollars in thousands)
Due in one year or less	$	24,088	$	24,417	$	459	$	450
Due after one year through five years		1,718,590		1,694,629		148,566		144,099
Due after five years through ten years		192,161		188,031		283,808		276,367
Due after ten years		35,237		34,515		365,451		355,214

Total investment securities	$	1,970,076	$	1,941,592	$	798,284	$	776,130

The investment in FHLB stock is periodically evaluated for impairment based on, among other things, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through March 31, 2018.

Acquired SJB Assets and FDIC Loss Sharing Asset

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Acquired SJB Assets and FDIC Loss Sharing Asset

6.	ACQUIRED SJB ASSETS AND FDIC LOSS SHARING ASSET

FDIC Assisted Acquisition

On October 16, 2009, the Bank acquired San Joaquin Bank (“SJB”) and entered into loss sharing agreements with the Federal Deposit Insurance Corporation (“FDIC”) that is more fully discussed in Note 3 – Summary of Significant Accounting Policies, included in our Annual Report on Form 10-K for the year ended December 31, 2017. The acquisition has been accounted for under the purchase method of accounting. The assets and liabilities were recorded at their estimated fair values as of the October 16, 2009 acquisition date. The acquired loans were accounted for as Purchase Credit Impaired (“PCI”) loans.

At March 31, 2018, the remaining discount associated with the PCI loans approximated $1.1 million. The loss sharing agreement for commercial loans expired October 16, 2014 and will expire for single-family residential loans on October 16, 2019.

The following table provides a summary of PCI loans and lease finance receivables by type and by internal risk ratings (credit quality indicators) for the periods indicated.


	March 31, 2018		December 31, 2017
	(Dollars in thousands)
Commercial and industrial	$	908	$	934
SBA		1,356		1,383
Real estate:
Commercial real estate		24,275		27,431
Construction		-		-
SFR mortgage		158		162
Dairy & livestock and agribusiness		10		770
Municipal lease finance receivables		-		-
Consumer and other loans		228		228

Gross PCI loans		26,935		30,908
Less: Purchase accounting discount		(1,074)		(2,026)

Gross PCI loans, net of discount		25,861		28,882
Less: Allowance for PCI loan losses		(312)		(367)

Net PCI loans	$	25,549	$	28,515

Credit Quality Indicators

The following table summarizes gross PCI loans by internal risk ratings for the periods indicated.


	March 31, 2018		December 31, 2017
	(Dollars in thousands)
Pass	$	22,892	$	26,439
Special mention		1,066		1,088
Substandard		2,977		3,381
Doubtful & loss		-		-

Total gross PCI loans	$	26,935	$	30,908

Loans and Lease Finance Receivables and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans and Lease Finance Receivables and Allowance for Loan Losses

7.	LOANS AND LEASE FINANCE RECEIVABLES AND ALLOWANCE FOR LOAN LOSSES

The following table provides a summary of the Company’s total loans and lease finance receivables, excluding PCI loans, by type.


	March 31, 2018			December 31, 2017
	(Dollars in thousands)

Commercial and industrial	$	514,229		$	513,325
SBA		123,432			122,055
Real estate:
Commercial real estate		3,411,216			3,376,713
Construction		79,898			77,982
SFR mortgage		237,618			236,202
Dairy & livestock and agribusiness		276,379			347,289
Municipal lease finance receivables		67,892			70,243
Consumer and other loans		64,159			64,229

Gross loans, excluding PCI loans		4,774,823			4,808,038
Less: Deferred loan fees, net		(5,701	)		(6,289	)

Gross loans, excluding PCI loans, net of deferred loan fees		4,769,122			4,801,749
Less: Allowance for loan losses		(59,623	)		(59,218	)

Net loans, excluding PCI loans		4,709,499			4,742,531

PCI Loans		26,935			30,908
Discount on PCI loans		(1,074	)		(2,026	)
Less: Allowance for loan losses		(312	)		(367	)

PCI loans, net		25,549			28,515

Total loans and lease finance receivables	$	4,735,048		$	4,771,046

As of March 31, 2018, 78.09% of the Company’s total gross loan portfolio (excluding PCI loans) consisted of real estate loans, 71.44% of which consisted of commercial real estate loans. Substantially all of the Company’s real estate loans and construction loans are secured by real properties located in California. As of March 31, 2018, $203.4 million, or 5.96% of the total commercial real estate loans included loans secured by farmland, compared to $206.1 million, or 6.10%, at December 31, 2017. The loans secured by farmland included $117.1 million for loans secured by dairy & livestock land and $86.3 million for loans secured by agricultural land at March 31, 2018, compared to $118.2 million for loans secured by dairy & livestock land and $87.9 million for loans secured by agricultural land at December 31, 2017. As of March 31, 2018, dairy & livestock and agribusiness loans of $276.4 million were comprised of $245.3 million for dairy & livestock loans and $31.1 million for agribusiness loans, compared to $310.6 million for dairy & livestock loans and $36.7 million for agribusiness loans at December 31, 2017.

At March 31, 2018, the Company held approximately $2.18 billion of total fixed rate loans, including PCI loans.

At March 31, 2018 and December 31, 2017, loans totaling $3.62 billion and $3.68 billion, respectively, were pledged to secure the borrowings and available lines of credit from the FHLB and the Federal Reserve Bank.

There were no outstanding loans held-for-sale as of March 31, 2018 and December 31, 2017.

Credit Quality Indicators

An important element of our approach to credit risk management is our loan risk rating system. The originating officer assigns each loan an initial risk rating, which is reviewed and confirmed or changed, as appropriate, by credit management. Approvals are made based upon the amount of inherent credit risk specific to the transaction and are reviewed for appropriateness by senior line and credit management personnel. Credits are monitored by line and credit management personnel for deterioration or improvement in a borrower’s financial condition, which would impact the ability of the borrower to perform under the contract. Risk ratings are adjusted as necessary.

Loans are risk rated into the following categories (Credit Quality Indicators): Pass, Special Mention, Substandard, Doubtful and Loss. Each of these groups is assessed for the proper amount to be used in determining the adequacy of our allowance for losses. These categories can be described as follows:

Pass — These loans, including loans on the Bank’s internal watch list, range from minimal credit risk to lower than average, but still acceptable, credit risk. Watch list loans usually require more than normal management attention. Loans on the watch list may involve borrowers with adverse financial trends, higher debt/equity ratios, or weaker liquidity positions, but not to the degree of being considered a defined weakness or problem loan where risk of loss may be apparent.

Special Mention — Loans assigned to this category have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in the deterioration of the repayment prospects for the asset or the Company’s credit position at some future date. Special mention assets are not adversely classified and do not expose the Company to sufficient risk to warrant adverse classification.

Substandard — Loans classified as substandard are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt. Substandard loans are characterized by the distinct possibility that the Company will sustain some loss if deficiencies are not corrected.

Doubtful — Loans classified as doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or the liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable.

Loss — Loans classified as loss are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off this asset with insignificant value even though partial recovery may be affected in the future.

The following table summarizes loans by type, excluding PCI loans, according to our internal risk ratings for the periods presented.


	March 31, 2018
	Pass		Special Mention		Substandard		Doubtful & Loss		Total
	(Dollars in thousands)
Commercial and industrial	$	486,079	$	17,312	$	10,838	$	-	$	514,229
SBA		114,632		5,294		3,506		-		123,432
Real estate:
Commercial real estate
Owner occupied		1,017,210		73,607		4,913		-		1,095,730
Non-owner occupied		2,291,202		18,337		5,947		-		2,315,486
Construction
Speculative		63,544		-		-		-		63,544
Non-speculative		16,354		-		-		-		16,354
SFR mortgage		230,517		3,100		4,001		-		237,618
Dairy & livestock and agribusiness		253,498		12,706		10,175		-		276,379
Municipal lease finance receivables		67,324		568		-		-		67,892
Consumer and other loans		62,225		1,113		821		-		64,159

Total gross loans, excluding PCI loans	$	4,602,585	$	132,037	$	40,201	$	-	$	4,774,823


	December 31, 2017
	Pass		Special Mention		Substandard		Doubtful & Loss		Total
	(Dollars in thousands)
Commercial and industrial	$	483,641	$	19,566	$	10,118	$	-	$	513,325
SBA		112,835		5,358		3,862		-		122,055
Real estate:
Commercial real estate
Owner occupied		1,009,199		76,111		10,970		-		1,096,280
Non-owner occupied		2,257,130		16,434		6,869		-		2,280,433
Construction
Speculative		60,042		-		-		-		60,042
Non-speculative		17,940		-		-		-		17,940
SFR mortgage		229,032		3,124		4,046		-		236,202
Dairy & livestock and agribusiness		321,413		9,047		16,829		-		347,289
Municipal lease finance receivables		69,644		599		-		-		70,243
Consumer and other loans		61,715		1,255		1,259		-		64,229

Total gross loans, excluding PCI loans	$	4,622,591	$	131,494	$	53,953	$	-	$	4,808,038

Allowance for Loan Losses (“ALLL”)

The Bank’s Audit and Director Loan Committees provide Board oversight of the ALLL process and approves the ALLL on a quarterly basis.

Our methodology for assessing the appropriateness of the allowance is conducted on a regular basis and considers the Bank’s overall loan portfolio. Refer to Note 3 – Summary of Significant Accounting Policies of the 2017 Annual Report on Form 10-K for the year ended December 31, 2017 for a more detailed discussion concerning the allowance for loan losses.

Management believes that the ALLL was appropriate at March 31, 2018 and December 31, 2017. No assurance can be given that economic conditions which adversely affect the Company’s service areas or other circumstances will not be reflected in increased provisions for loan losses in the future.

The following tables present the balance and activity related to the allowance for loan losses for held-for-investment loans by type for the periods presented.


	For the Three Months Ended March 31, 2018
	Ending Balance December 31, 2017		Charge-offs			Recoveries		(Recapture of) Provision for Loan Losses			Ending Balance March 31, 2018
	(Dollars in thousands)
Commercial and industrial	$	7,280	$	-		$	10	$	209		$	7,499
SBA		869		-			5		10			884
Real estate:
Commercial real estate		41,722		-			-		141			41,863
Construction		984		-			1,334		(1,331	)		987
SFR mortgage		2,112		-			-		90			2,202
Dairy & livestock and agribusiness		4,647		-			-		19			4,666
Municipal lease finance receivables		851		-			-		(17	)		834
Consumer and other loans		753			(7)		8		(66	)		688
PCI loans		367		-			-		(55	)		312

Total allowance for loan losses	$	59,585	$		(7)	$	1,357	$	(1,000	)	$	59,935


	For the Three Months Ended March 31, 2017
	Ending Balance December 31, 2016		Charge-offs			Recoveries		(Recapture of) Provision for Loan Losses			Ending Balance March 31, 2017
	(Dollars in thousands)
Commercial and industrial	$	8,154	$	-		$	52	$	(250	)	$	7,956
SBA		871		-			4		(4	)		871
Real estate:
Commercial real estate		37,443		-			-		1,543			38,986
Construction		1,096		-			2,025		(2,301	)		820
SFR mortgage		2,287		-			64		(165	)		2,186
Dairy & livestock and agribusiness		8,541		-			-		(2,699	)		5,842
Municipal lease finance receivables		941		-			-		(52	)		889
Consumer and other loans		988		(2	)		29		(78	)		937
PCI loans		1,219		-			-		(494	)		725

Total allowance for loan losses	$	61,540	$	(2	)	$	2,174	$	(4,500	)	$	59,212

The following tables present the recorded investment in loans held-for-investment and the related allowance for loan losses by loan type, based on the Company’s methodology for determining the allowance for loan losses for the periods presented. Acquired loans are also supported by a credit discount established through the determination of fair value for the acquired loan portfolio.


	March 31, 2018
	Recorded Investment in Loans						Allowance for Loan Losses
	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality
					(Dollars in thousands)
Commercial and industrial	$	432	$	513,797	$	-	$	-	$	7,499	$	-
SBA		1,201		122,231		-		-		884		-
Real estate:
Commercial real estate		7,992		3,403,224		-		-		41,863		-
Construction		-		79,898		-		-		987		-
SFR mortgage		3,576		234,042		-		-		2,202		-
Dairy & livestock and agribusiness		818		275,561		-		-		4,666		-
Municipal lease finance receivables		-		67,892		-		-		834		-
Consumer and other loans		438		63,721		-		-		688		-
PCI loans		-		-		25,861		-		-		312

Total	$	14,457	$	4,760,366	$	25,861	$	-	$	59,623	$	312


	March 31, 2017
	Recorded Investment in Loans						Allowance for Loan Losses
	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality
					(Dollars in thousands)
Commercial and industrial	$	1,150	$	527,795	$	-	$	88	$	7,868	$	-
SBA		1,926		110,764		-		9		862		-
Real estate:
Commercial real estate		20,216		3,199,083		-		-		38,986		-
Construction		384		72,398		-		-		820		-
SFR mortgage		4,248		241,114		-		-		2,186		-
Dairy & livestock and agribusiness		1,324		242,940		-		-		5,842		-
Municipal lease finance receivables		-		62,416		-		-		889		-
Consumer and other loans		801		79,362		-		-		937		-
PCI loans		-		-		56,527		-		-		725

Total	$	30,049	$	4,535,872	$	56,527	$	97	$	58,390	$	725

Past Due and Nonperforming Loans

We seek to manage asset quality and control credit risk through diversification of the loan portfolio and the application of policies designed to promote sound underwriting and loan monitoring practices. The Bank’s Credit Management Division is in charge of monitoring asset quality, establishing credit policies and procedures and enforcing the consistent application of these policies and procedures across the Bank. Reviews of nonperforming, past due loans and larger credits, designed to identify potential charges to the allowance for loan losses, and to determine the adequacy of the allowance, are conducted on an ongoing basis. These reviews consider such factors as the financial strength of borrowers and any guarantors, the value of the applicable collateral, loan loss experience, estimated loan losses, growth in the loan portfolio, prevailing economic conditions and other factors. Refer to Note 3 – Summary of Significant Accounting Policies, included in our Annual Report on Form 10-K for the year ended December 31, 2017, for additional discussion concerning the Bank’s policy for past due and nonperforming loans.

A loan is reported as a Troubled Debt Restructuring (“TDR”) when the Bank grants a concession(s) to a borrower experiencing financial difficulties that the Bank would not otherwise consider. Examples of such concessions include a reduction in the interest rate, deferral of principal or accrued interest, extending the payment due dates or loan maturity date(s), or providing a lower interest rate than would be normally available for new debt of similar risk. As a result of one or more of these concessions, restructured loans are classified as impaired. Impairment reserves on non-collateral dependent restructured loans are measured by comparing the present value of expected future cash flows on the restructured loans discounted at the interest rate of the original loan agreement to the loan’s carrying value. These impairment reserves are recognized as a specific component to be provided for in the allowance for loan losses.

Generally, when loans are identified as impaired they are moved to our Special Assets Department. When we identify a loan as impaired, we measure the loan for potential impairment using discounted cash flows, unless the loan is determined to be collateral dependent. In these cases, we use the current fair value of collateral, less selling costs. Generally, the determination of fair value is established through obtaining external appraisals of the collateral.

The following tables present the recorded investment in, and the aging of, past due and nonaccrual loans, excluding PCI loans, by type of loans for the periods presented.


	March 31, 2018
	30-59 Days Past Due		60-89 Days Past Due		Total Past Due and Accruing		Nonaccrual (1)		Current		Total Loans and Financing Receivables
	(Dollars in thousands)
Commercial and industrial	$	-	$	-	$	-	$	272	$	513,957	$	514,229
SBA		-		-		-		589		122,843		123,432
Real estate:
Commercial real estate
Owner occupied		-		-		-		4,332		1,091,398		1,095,730
Non-owner occupied		-		-		-		2,414		2,313,072		2,315,486
Construction
Speculative (2)		-		-		-		-		63,544		63,544
Non-speculative		-		-		-		-		16,354		16,354
SFR mortgage		680		-		680		1,309		235,629		237,618
Dairy & livestock and agribusiness		-		-		-		818		275,561		276,379
Municipal lease finance receivables		-		-		-		-		67,892		67,892
Consumer and other loans		63		-		63		438		63,658		64,159

Total gross loans, excluding PCI loans	$	743	$	-	$	743	$	10,172	$	4,763,908	$	4,774,823

(1)

As of March 31, 2018, $3.6 million of nonaccruing loans were current, $431,000 were 30-59 days past due, and $6.2 million were 90+ days past due.

(2)

Speculative construction loans are generally for properties where there is no identified buyer or renter.


	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		Total Past Due and Accruing		Nonaccrual (1)		Current		Total Loans and Financing Receivables
	(Dollars in thousands)
Commercial and industrial	$	768	$	-	$	768	$	250	$	512,307	$	513,325
SBA		403		-		403		906		120,746		122,055
Real estate:
Commercial real estate
Owner occupied		-		-		-		4,365		1,091,915		1,096,280
Non-owner occupied		-		-		-		2,477		2,277,956		2,280,433
Construction
Speculative (2)		-		-		-		-		60,042		60,042
Non-speculative		-		-		-		-		17,940		17,940
SFR mortgage		-		-		-		1,337		234,865		236,202
Dairy & livestock and agribusiness		-		-		-		829		346,460		347,289
Municipal lease finance receivables		-		-		-		-		70,243		70,243
Consumer and other loans		1		-		1		552		63,676		64,229

Total gross loans, excluding PCI loans	$	1,172	$	-	$	1,172	$	10,716	$	4,796,150	$	4,808,038

(1)

As of December 31, 2017, $3.6 million of nonaccruing loans were current, $376,000 were 60-89 days past due and $6.8 million were 90+ days past due.

(2)

Speculative construction loans are generally for properties where there is no identified buyer or renter.

Impaired Loans

At March 31, 2018, the Company had impaired loans, excluding PCI loans, of $14.5 million. Impaired loans included $6.7 million of nonaccrual commercial real estate loans, $1.3 million of nonaccrual single-family residential (“SFR”) mortgage loans, $818,000 of nonaccrual dairy & livestock and agribusiness loans, $589,000 of nonaccrual Small Business Administration (“SBA”) loans, $438,000 of nonaccrual consumer and other loans, and $272,000 of nonaccrual commercial and industrial loans. These impaired loans included $8.2 million of loans whose terms were modified in a troubled debt restructuring, of which $3.9 million were classified as nonaccrual. The remaining balance of $4.3 million consisted of 15 loans performing according to the restructured terms. The impaired loans had a specific allowance of zero at March 31, 2018. At December 31, 2017, the Company had classified as impaired, loans, excluding PCI loans, with a balance of $15.5 million with a related allowance of $75,000.

The following tables present information for held-for-investment loans, excluding PCI loans, individually evaluated for impairment by type of loans, as and for the periods presented.


	As of and For the Three Months Ended
	March 31, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	432	$	986	$	-	$	461	$	2
SBA		1,201		1,327		-		1,220		12
Real estate:
Commercial real estate
Owner occupied		4,332		4,755		-		4,348		-
Non-owner occupied		3,660		5,033		-		3,715		22
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		3,576		4,236		-		3,599		25
Dairy & livestock and agribusiness		818		1,091		-		826		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		438		640		-		519		-

Total		14,457		18,068		-		14,688		61

With a related allowance recorded:
Commercial and industrial		-		-		-		-		-
SBA		-		-		-		-		-
Real estate:
Commercial real estate
Owner occupied		-		-		-		-		-
Non-owner occupied		-		-		-		-		-
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		-		-		-		-		-

Total		-		-		-		-		-

Total impaired loans	$	14,457	$	18,068	$	-	$	14,688	$	61

	As of and For the Three Months Ended
	March 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	1,015	$	1,985	$	-	$	1,045	$	6
SBA		1,917		2,272		-		1,960		16
Real estate:
Commercial real estate
Owner occupied		6,669		7,081		-		6,434		32
Non-owner occupied		13,547		16,198		-		13,479		401
Construction
Speculative		384		402		-		384		-
Non-speculative		-		-		-		-		-
SFR mortgage		4,248		5,024		-		4,259		34
Dairy & livestock and agribusiness		1,324		1,610		-		1,839		1
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		801		1,379		-		809		5

Total		29,905		35,951		-		30,209		495

With a related allowance recorded:
Commercial and industrial		135		136		88		152		2
SBA		9		25		9		10		-
Real estate:
Commercial real estate
Owner occupied		-		-		-		-		-
Non-owner occupied		-		-		-		-		-
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		-		-		-		-		-

Total		144		161		97		162		2

Total impaired loans	$	30,049	$	36,112	$	97	$	30,371	$	497


	As of December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	440	$	980	$	-
SBA		1,530		1,699		-
Real estate:
Commercial real estate
Owner occupied		4,365		4,763		-
Non-owner occupied		3,768		5,107		-
Construction
Speculative		-		-		-
Non-speculative		-		-		-
SFR mortgage		4,040		4,692		-
Dairy & livestock and agribusiness		829		1,091		-
Municipal lease finance receivables		-		-		-
Consumer and other loans		174		370		-

Total		15,146		18,702		-

With a related allowance recorded:
Commercial and industrial		-		-		-
SBA		1		18		1
Real estate:
Commercial real estate
Owner occupied		-		-		-
Non-owner occupied		-		-		-
Construction
Speculative		-		-		-
Non-speculative		-		-		-
SFR mortgage		-		-		-
Dairy & livestock and agribusiness		-		-		-
Municipal lease finance receivables		-		-		-
Consumer and other loans		378		391		74

Total		379		409		75

Total impaired loans	$	15,525	$	19,111	$	75

The Company recognizes the charge-off of the impairment allowance on impaired loans in the period in which a loss is identified for collateral dependent loans. Therefore, the majority of the nonaccrual loans as of March 31, 2018, December 31, 2017 and March 31, 2017 have already been written down to the estimated net realizable value. An allowance is recorded on impaired loans for the following: nonaccrual loans where a charge-off is not yet processed, nonaccrual SFR mortgage loans where there is a potential modification in process, or on smaller balance non-collateral dependent loans.

Reserve for Unfunded Loan Commitments

The allowance for off-balance sheet credit exposure relates to commitments to extend credit, letters of credit and undisbursed funds on lines of credit. The Company evaluates credit risk associated with the off-balance sheet loan commitments at the same time it evaluates credit risk associated with the loan and lease portfolio. There was no provision or recapture of provision for unfunded loan commitments for the three months ended March 31, 2018, and 2017. As of March 31, 2018 and December 31, 2017, the balance in this reserve was $6.3 million and was included in other liabilities.

Troubled Debt Restructurings (“TDRs”)

Loans that are reported as TDRs are considered impaired and charge-off amounts are taken on an individual loan basis, as deemed appropriate. The majority of restructured loans are loans for which the terms of repayment have been renegotiated, resulting in a reduction in interest rate or deferral of principal. Refer to Note 3 – Summary of Significant Accounting Policies, included in our Annual Report on Form 10-K for the year ended December 31, 2017 for a more detailed discussion regarding TDRs.

As of March 31, 2018, there were $8.2 million of loans classified as a TDR, of which $3.9 million were nonperforming and $4.3 million were performing. TDRs on accrual status are comprised of loans that were accruing interest at the time of restructuring or have demonstrated repayment performance in compliance with the restructured terms for a sustained period and for which the Company anticipates full repayment of both principal and interest. At March 31, 2018, performing TDRs were comprised of nine SFR mortgage loans of $2.3 million, two commercial real estate loans of $1.2 million, one SBA loan of $612,000, and three commercial and industrial loans of $160,000.

The majority of TDRs have no specific allowance allocated as any impairment amount is normally charged off at the time a probable loss is determined. We have allocated zero and $1,000 of specific allowance to TDRs as of March 31, 2018 and December 31, 2017, respectively.

The following table provides a summary of the activity related to TDRs for the periods presented.


	For the Three Months Ended
	March 31,
	2018			2017
	(Dollars in thousands)
Performing TDRs:
Beginning balance	$	4,809		$	19,233
New modifications		-			3,143
Payoffs/payments, net and other		(524	)		(3,003	)
TDRs returned to accrual status		-			329
TDRs placed on nonaccrual status		-			-

Ending balance	$	4,285		$	19,702

Nonperforming TDRs:
Beginning balance	$	4,200		$	1,626
New modifications		-			2,066
Charge-offs		-			-
Payoffs/payments, net and other		(291	)		(1,956	)
TDRs returned to accrual status		-			(329	)
TDRs placed on nonaccrual status		-			-

Ending balance	$	3,909		$	1,407

Total TDRs	$	8,194		$	21,109

There were no loans that were modified as TDRs during the three months ended March 31, 2018.

The following table summarizes loans modified as troubled debt restructurings for the period presented.


Modifications (1)

	For the Three Months Ended March 31, 2017
	Number of Loans		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Outstanding Recorded Investment at March 31, 2017		Financial Effect Resulting From Modifications (2)
	(Dollars in thousands)
Commercial and industrial:
Interest rate reduction		-	$	-	$	-	$	-	$	-
Change in amortization period or maturity		-		-		-		-		-
SBA:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		-		-		-		-		-
Real estate:
Commercial real estate:
Owner occupied
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		3,143		3,143		3,143		-
Non-owner occupied
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		-		-		-		-		-
Dairy & livestock and agribusiness:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		1,984		1,984		78		-
Consumer:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		82		82		80		-

Total loans		3	$	5,209	$	5,209	$	3,301	$	-

(1)

The tables above exclude modified loans that were paid off prior to the end of the period.

(2)

Financial effects resulting from modifications represent charge-offs and specific allowance recorded at modification date.

As of March 31, 2018 and 2017, there were no loans that were previously modified as a TDR within the previous 12 months that subsequently defaulted during the three months ended March 31, 2018 and 2017, respectively.

Earnings Per Share Reconciliation

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share Reconciliation

8.	EARNINGS PER SHARE RECONCILIATION

Basic earnings per common share are computed by dividing income allocated to common stockholders by the weighted-average number of common shares outstanding during each period. The computation of diluted earnings per common share considers the number of shares issuable upon the assumed exercise of outstanding common stock options. Antidilutive common shares are not included in the calculation of diluted earnings per common share. For the three months ended March 31, 2018 and 2017, shares deemed to be antidilutive, and thus excluded from the computation of earnings per common share were 16,000 and 1,000, respectively.

The table below shows earnings per common share and diluted earnings per common share, and reconciles the numerator and denominator of both earnings per common share calculations.


	For the Three Months Ended March 31,
	2018		2017
	(In thousands, except per share amounts)
Earnings per common share:
Net earnings	$	34,913	$	28,504
Less: Net earnings allocated to restricted stock		108		112

Net earnings allocated to common shareholders	$	34,805	$	28,392

Weighted average shares outstanding		109,859		108,339
Basic earnings per common share	$	0.32	$	0.26


Diluted earnings per common share:
Net income allocated to common shareholders	$	34,805	$	28,392

Weighted average shares outstanding		109,859		108,339
Incremental shares from assumed exercise of outstanding options		364		467

Diluted weighted average shares outstanding		110,223		108,806
Diluted earnings per common share	$	0.32	$	0.26

Fair Value Information

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Information

9.	FAIR VALUE INFORMATION

Fair Value Hierarchy

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

The following disclosure provides the fair value information for financial assets and liabilities as of March 31, 2018. The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels (Level 1, Level 2 and Level 3).

Level 1 – includes assets and liabilities that have an active market that provides an objective quoted value for each unit. Here the active market quoted value is used to measure the fair value. Level 1 has the most objective measurement of fair value. Level 2 is less objective and Level 3 is the least objective (most subjective) in estimating fair value.

Level 2 – assets and liabilities are ones where there is no active market in the same assets, but where there are parallel markets or alternative means to estimate fair value using observable information inputs such as the value placed on similar assets or liability that were recently traded.

Level 3 – fair values are based on information from the entity that reports these values in their financial statements. Such data are referred to as unobservable, in that the valuations are not based on data available to parties outside the entity.

Observable and unobservable inputs are the key elements that separate the levels in the fair value hierarchy. Inputs here refer explicitly to the types of information used to obtain the fair value of the asset or liability.

Observable inputs include data sources and market prices available and visible outside of the entity. While there will continue to be judgments required when an active market price is not available, these inputs are external to the entity and observable outside the entity; they are consequently considered more objective than internal unobservable inputs used for Level 3 fair value.

Unobservable inputs are data and analyses that are developed within the entity to assess the fair value, such as management estimates of future benefits from use of assets.

There were no transfers in and out of Level 1 and Level 2 during the three months ended March 31, 2018 and 2017.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The tables below present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented.


	Carrying Value at March 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
Description of assets
Investment securities - AFS:
Residential mortgage-backed securities	$	1,631,340	$	-	$	1,631,340	$	-
CMO/REMIC - residential		255,646		-		255,646		-
Municipal bonds		53,868		-		53,868		-
Other securities		738		-		738		-

Total investment securities - AFS		1,941,592		-		1,941,592		-
Interest rate swaps		1,645		-		1,645		-

Total assets	$	1,943,237	$	-	$	1,943,237	$	-

Description of liability
Interest rate swaps	$	1,645	$	-	$	1,645	$	-

Total liabilities	$	1,645	$	-	$	1,645	$	-


	Carrying Value at December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
Description of assets
Investment securities - AFS:
Residential mortgage-backed securities	$	1,750,909	$	-	$	1,750,909	$	-
CMO/REMIC - residential		273,829		-		273,829		-
Municipal bonds		55,496		-		55,496		-
Other securities		751		-		751		-

Total investment securities - AFS		2,080,985		-		2,080,985		-
Interest rate swaps		3,211		-		3,211		-

Total assets	$	2,084,196	$	-	$	2,084,196	$	-

Description of liability
Interest rate swaps	$	3,211	$	-	$	3,211	$	-

Total liabilities	$	3,211	$	-	$	3,211	$	-

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

We may be required to measure certain assets at fair value on a non-recurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower of cost or fair value accounting or impairment write-downs of individual assets.

There were no assets measured at fair value on a non-recurring basis that were held on the balance sheet at March 31, 2018. For assets measured at fair value on a non-recurring basis that were held on the balance sheet at December 31, 2017, the following tables provide the level of valuation assumptions used to determine each adjustment and the carrying value of the related assets that had losses during the period.


	Carrying Value at December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Losses For the Year Ended December 31, 2017
	(Dollars in thousands)
Description of assets
Impaired loans, excluding PCI loans:
Commercial and industrial	$	-	$	-	$	-	$	-	$	-
SBA		-		-		-		-		-
Real estate:
Commercial real estate		-		-		-		-		-
Construction		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Consumer and other loans		378		-		-		378		74
Other real estate owned		-		-		-		-		-
Asset held-for-sale		-		-		-		-		-

Total assets	$	378	$	-	$	-	$	378	$	74

Fair Value of Financial Instruments

The following disclosure presents estimated fair value of our financial instruments. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is required to develop the estimates of fair value. Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company may realize in a current market exchange as of March 31, 2018 and December 31, 2017, respectively. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.


	March 31, 2018
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Total cash and cash equivalents	$	456,238	$	456,238	$	-	$	-	$	456,238
Interest-earning balances due from depository institutions		10,100		-		10,095		-		10,095
FHLB stock		17,688		-		17,688		-		17,688
Investment securities available-for-sale		1,941,592		-		1,941,592		-		1,941,592
Investment securities held-to-maturity		798,284		-		776,130		-		776,130
Total loans, net of allowance for loan losses (1)		4,735,048		-		-		4,555,459		4,555,459
Swaps		1,645		-		1,645		-		1,645
Liabilities
Deposits:
Noninterest-bearing	$	4,062,691	$	4,062,691	$	-	$	-	$	4,062,691
Interest-bearing		2,646,744		-		2,643,627		-		2,643,627
Borrowings		487,277		-		486,924		-		486,924
Junior subordinated debentures		25,774		-		-		19,909		19,909
Swaps		1,645		-		1,645		-		1,645

	December 31, 2017
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Total cash and due from banks	$	144,377	$	144,377	$	-	$	-	$	144,377
Interest-earning balances due from depository institutions		17,952		-		17,951		-		17,951
FHLB stock		17,688		-		17,688		-		17,688
Investment securities available-for-sale		2,080,985		-		2,080,985		-		2,080,985
Investment securities held-to-maturity		829,890		-		819,215		-		819,215
Total loans, net of allowance for loan losses		4,771,046		-		-		4,678,402		4,678,402
Swaps		3,211		-		3,211		-		3,211
Liabilities
Deposits:
Noninterest-bearing	$	3,846,436	$	3,846,436	$	-	$	-	$	3,846,436
Interest-bearing		2,700,417		-		2,697,781		-		2,697,781
Borrowings		553,773		-		553,416		-		553,416
Junior subordinated debentures		25,774		-		-		18,070		18,070
Swaps		3,211		-		3,211		-		3,211

(1)

The fair value of loans as of March 31, 2018 was measured using an exit price notion.

The fair value estimates presented herein are based on pertinent information available to management as of March 31, 2018 and December 31, 2017. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date, and therefore, current estimates of fair value may differ significantly from the amounts presented above.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Business Segments

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Business Segments

10.

BUSINESS SEGMENTS

The Company has identified two principal reportable segments: Banking Centers (“Centers”) and Dairy & Livestock and Agribusiness. All other operations have been aggregated in “Other”. The Bank has 51 Banking Centers organized in geographic regions, which are the focal points for customer sales and services. The Company utilizes an internal reporting system to measure the performance of various operating departments within the Bank which is the basis for determining the Bank’s reportable segments. The chief operating decision maker (currently our CEO) regularly reviews the financial information of these two segments in deciding how to allocate resources and to assess performance. Our two principal reporting segments, Centers and Dairy & Livestock and Agribusiness, are aggregated into separate operating segments as their products and services are similar and are sold to similar types of customers, have similar production and distribution processes, have similar economic characteristics, and have similar reporting and organizational structures. All other operating departments have been aggregated and included in “Other” for reporting purposes. Recapture of provision for loan losses was allocated by reporting segment based on loan type. In addition, the Company allocates internal funds to the segments using a methodology that charges users of funds interest expense and credits providers of funds interest income with the net effect of this allocation being recorded in the “Other” category.

The following tables represent the selected financial information for these two business segments. GAAP does not have an authoritative body of knowledge regarding the management accounting used in presenting segment financial information. The accounting policies for each of the business units is the same as those policies identified for the consolidated Company and disclosed in Note 3 – Summary of Significant Accounting Policies, included in our Annual Report on Form 10-K for the year ended December 31, 2017. The income numbers represent the actual income and expenses of each business unit. In addition, each segment has allocated income and expenses based on management’s internal reporting system, which allows management to determine the performance of each of its business units. Loan fees included in the Centers category are the actual loan fees paid to the Company by its customers. These fees are eliminated and deferred in the “Other” category, resulting in deferred loan fees for the condensed consolidated financial statements. All income and expense items not directly associated with the Centers’ business segment are grouped in the “Other” category. Future changes in the Company’s management structure or reporting methodologies may result in changes in the measurement of operating segment results.

The following tables present the operating results and other key financial measures for the individual operating segments for the periods presented.


	For the Three Months Ended March 31, 2018
	Centers		Dairy & livestock and agribusiness		Other (1)			Total
	(Dollars in thousands)
Net interest income	$	49,583	$	3,851	$	17,087		$	70,521
(Recapture of) provision for loan losses		329		19		(1,348	)		(1,000	)

Net interest income after (recapture of) provision for loan losses		49,254		3,832		18,435			71,521

Noninterest income		5,301		45		7,570			12,916
Noninterest expense		13,225		517		22,204			35,946

Segment pre-tax profit	$	41,330	$	3,360	$	3,801		$	48,491

Goodwill	$	116,564	$	-	$	-		$	116,564

Segment assets as of March 31, 2018	$	7,231,624	$	407,527	$	717,009		$	8,356,160

(1)

Includes the elimination of certain items that are included in more than one department, most of which represents products and services for Centers’ customers.


	For the Three Months Ended March 31, 2017
	Centers		Dairy & livestock and agribusiness			Other (1)			Total
	(Dollars in thousands)
Net interest income	$	45,578	$	2,144		$	17,711		$	65,433
(Recapture of) provision for loan losses		511		(2,699	)		(2,312	)		(4,500	)

Net interest income after (recapture of) provision for loan losses		45,067		4,843			20,023			69,933

Noninterest income		5,207		55			3,460			8,722
Noninterest expense		12,438		501			21,178			34,117

Segment pre-tax profit	$	37,836	$	4,397		$	2,305		$	44,538

Goodwill	$	119,193	$	-		$	-		$	119,193

Segment assets as of March 31, 2017	$	7,399,909	$	363,029		$	796,183		$	8,559,121

(1)

Includes the elimination of certain items that are included in more than one department, most of which represents products and services for Centers’ customers.

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

11.

DERIVATIVE FINANCIAL INSTRUMENTS

The Bank is exposed to certain risks relating to its ongoing business operations and utilizes interest rate swap agreements (“swaps”) as part of its asset/liability management strategy to help manage its interest rate risk position. As of March 31, 2018, the Bank has entered into 77 interest-rate swap agreements with customers. The Bank then entered into identical offsetting swaps with a counterparty bank. The swap agreements are not designated as hedging instruments. The purpose of entering into offsetting derivatives not designated as a hedging instrument is to provide the Bank a variable-rate loan receivable and to provide the customer the financial effects of a fixed-rate loan without creating significant volatility in the Bank’s earnings.

The structure of the swaps is as follows. The Bank enters into an interest rate swap with its customers in which the Bank pays the customer a variable rate and the customer pays the Bank a fixed rate, therefore allowing customers to convert variable rate loans to fixed rate loans. At the same time, the Bank enters into a swap with the counterparty bank in which the Bank pays the counterparty a fixed rate and the counterparty in return pays the Bank a variable rate, which has the effect of passing on the interest-rate risk associated with the customer’s fixed rate swap to the counterparty bank. The net effect of the transaction allows the Bank to receive interest on the loan from the customer at a variable rate based on LIBOR plus a spread. The changes in the fair value of the swaps primarily offset each other and therefore should not have a significant impact on the Company’s results of operations, although the Company does incur credit and counterparty risk with respect to performance on the swap agreements by the Bank’s customer and counterparty, respectively. Our interest rate swap derivatives are subject to a master netting arrangement with one counterparty bank. None of our derivative assets and liabilities are offset in the balance sheet.

We believe our risk of loss associated with our counterparty borrowers related to interest rate swaps is mitigated as the loans with swaps are underwritten to take into account potential additional exposure, although there can be no assurances in this regard since the performance of our swaps is subject to market and counterparty risk.

Balance Sheet Classification of Derivative Financial Instruments

As of March 31, 2018 and December 31, 2017, the total notional amount of the Company’s swaps was $191.4 million, and $198.5 million, respectively. The location of the asset and liability, and their respective fair values are summarized in the tables below.

March 31, 2018

Asset Derivatives

Liability Derivatives

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

(Dollars in thousands)

Derivatives not designated as hedging instruments:

Interest rate swaps

Other assets

1,645

Other liabilities

1,645

Total derivatives

1,645

December 31, 2017

Asset Derivatives

Liability Derivatives

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

(Dollars in thousands)

Derivatives not designated as hedging instruments:

Interest rate swaps

Other assets

3,211

Other liabilities

3,211

Total derivatives

3,211

The Effect of Derivative Financial Instruments on the Condensed Consolidated Statements of Earnings

The following table summarizes the effect of derivative financial instruments on the condensed consolidated statement of earnings for the periods presented.


Derivatives Not Designated as Hedging Instruments	Location of Gain Recognized in Income on Derivative Instruments		Amount of Gain Recognized in Income on Derivative Instruments
			For the Three Months Ended March 31,
			2018		2017
			(Dollars in thousands)
Interest rate swaps		Other income	$	116	$	323

Total			$	116	$	323

Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Other Comprehensive Income

12.

OTHER COMPREHENSIVE INCOME

The table below provides a summary of the components of other comprehensive income (“OCI”) for the periods presented.


	For the Three Months Ended March 31,
	2018									2017
	Before-tax			Tax effect			After-tax			Before-tax			Tax effect			After-tax
	(Dollars in thousands)
Investment securities:
Net change in fair value recorded in accumulated OCI	$	(31,338	)	$	(9,265	)	$	(22,073	)	$	1,207		$	507		$	700
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity		(832	)		(246	)		(586	)		(783	)		(329	)		(454	)

Net change	$	(32,170	)	$	(9,511	)	$	(22,659	)	$	424		$	178		$	246

Balance Sheet Offsetting

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Balance Sheet Offsetting

13.

BALANCE SHEET OFFSETTING

Assets and liabilities relating to certain financial instruments, including, derivatives and securities sold under repurchase agreements (“repurchase agreements”), may be eligible for offset in the condensed consolidated balance sheets as permitted under accounting guidance. As noted above, our interest rate swap derivatives are subject to a master netting arrangement with one counterparty bank. Our interest rate swap derivatives require the Company to pledge investment securities as collateral based on certain risk thresholds. Investment securities that have been pledged by the Company to the counterparty bank continue to be reported in the Company’s condensed consolidated balance sheets unless the Company defaults. We offer a repurchase agreement product to our customers, which include master netting agreements that allow for the netting of collateral positions. This product, known as Citizens Sweep Manager, sells certain of our securities overnight to our customers under an agreement to repurchase them the next day. The repurchase agreements are not offset in the condensed consolidated balances.


	Gross Amounts Recognized in the Condensed		Gross Amounts Offset in the Condensed			Net Amounts of Assets Presented in the Condensed		Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
	Consolidated Balance Sheets		Consolidated Balance Sheets			Consolidated Balance Sheets		Financial Instruments		Collateral Pledged			Net Amount
	(Dollars in thousands)
March 31, 2018
Financial assets:
Derivatives not designated as hedging instruments	$	1,645	$	-		$	-	$	1,645	$	-		$	1,645

Total	$	1,645	$	-		$	-	$	1,645	$	-		$	1,645


Financial liabilities:
Derivatives not designated as hedging instruments	$	5,014	$	(3,369	)	$	1,645	$	3,369	$	(12,526	)	$	(7,512	)
Repurchase agreements		487,277		-			487,277		-		(626,413	)		(139,136	)

Total	$	492,291	$	(3,369	)	$	488,922	$	3,369	$	(638,939	)	$	(146,648	)


December 31, 2017
Financial assets:
Derivatives not designated as hedging instruments	$	3,211	$	-		$	-	$	3,211	$	-		$	3,211

Total	$	3,211	$	-		$	-	$	3,211	$	-		$	3,211


Financial liabilities:
Derivatives not designated as hedging instruments	$	4,495	$	(1,284	)	$	3,211	$	1,284	$	(12,760	)	$	(8,265	)
Repurchase agreements		553,773		-			553,773		-		(573,759	)		(19,986	)

Total	$	558,268	$	(1,284	)	$	556,984	$	1,284	$	(586,519	)	$	(28,251	)

Revenue Recognition

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

14.

REVENUE RECOGNITION

On January 1, 2018, the Company adopted ASU No. 2014-09 “Revenue from Contracts with Customers” (Topic 606) and all subsequent ASUs that modified Topic 606. As stated in Note 3 Summary of Significant Accounting Policies, the implementation of the new standard did not have a material impact on the measurement or recognition of revenue; as such, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts were not adjusted and continue to be reported in accordance with our historic accounting under Topic 605.

Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of the new guidance. Topic 606 is applicable to noninterest revenue streams such as trust and asset management income, deposit related fees, interchange fees, and merchant income. However, the recognition of these revenue streams did not change significantly upon adoption of Topic 606. Substantially all of the Company’s revenue is generated from contracts with customers. Noninterest revenue streams in-scope of Topic 606 are discussed below.

Trust and Investment Services

Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Company does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. The Company’s performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered.

Wealth Management contracts with customers have no clauses that would entitle customers to additional services. Fees are earned based on market value of assets under management (AUM) and miscellaneous fees are transaction driven and are charged based on an agreed upon fee schedule. Performance obligation is satisfied upon execution of the transaction and there is no need to allocate transaction price to the performance obligation(s) in the contract. Wealth management customers can also terminate the contract at will. Based on our review, we did not find provisions in the contracts that will require changes to the current accounting under Topic 606.

For Investment Services, the fees are earned based on services performed for customers of an affiliated broker-dealer. Fees are earned from gross dealer commission based on trade date. Performance obligation is satisfied upon execution of the transaction and there is no need to allocate transaction price to the performance obligation(s) in the contract. Based on our review, we did not find provisions in the contracts that will require changes to the current accounting under Topic 606.

Deposit-related Fees

Service charges on deposit accounts consist of account analysis fees earned on analyzed business checking accounts, monthly service fees, and other deposit account related fees. The Company’s performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Company’s performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts.

Bankcard Services

The Bank generates revenues from merchant servicing to its clients. A fee schedule is part of the contract and is calculated based on sales of merchants on a monthly basis. There is no future promise or claim to deliver services as merchant fees are based on monthly merchant transactions. The Company’s performance obligations are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Therefore, the new revenue standard has no impact on revenues generated from bankcard services.

The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2018 and 2017.


	For the Three Months Ended March 31,
	2018		2017
	(Dollars in thousands)
Noninterest income:
In-scope of Topic 606:
Service charges on deposit accounts	$	4,045	$	3,727
Trust and investment services		2,157		2,296
Bankcard services		804		765
Other		1,391		1,219

Noninterest Income (in-scope of Topic 606)		8,397		8,007
Noninterest Income (out-of-scope of Topic 606)		4,519		715

Total noninterest income	$	12,916	$	8,722

Contract Balances

A contract asset balance occurs when an entity performs a service for a customer before the customer pays consideration (resulting in a contract receivable) or before payment is due (resulting in a contract asset). A contract liability balance is an entity’s obligation to transfer a service to a customer for which the entity has already received payment (or payment is due) from the customer. The Company’s noninterest revenue streams are largely based on transactional activity, or standard month-end revenue accruals such as asset management fees based on month-endmarket values. Consideration is often received immediately or shortly after the Company satisfies its performance obligation and revenue is recognized. The Company does not typically enter into long-term revenue contracts with customers, and therefore, does not experience significant contract balances. As of March 31, 2018 and December 31, 2017, the Company did not have any significant contract balances.

Contract Acquisition Costs

In connection with the adoption of Topic 606, an entity is required to capitalize, and subsequently amortize into expense, certain incremental costs of obtaining a contract with a customer if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained (for example, sales commission). The Company utilizes the practical expedient, which allows entities to immediately expense contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. Upon adoption of Topic 606, the Company did not capitalize any contract acquisition costs.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Reclassification

Use of Estimates in the Preparation of Financial Statements

Adoption of New Accounting Standard and Recent Accounting Pronouncements

Fair Value Hierarchy

Fair Value Hierarchy

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Value of Investment Securities


	March 31, 2018
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss		Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,655,742	$	2,158	$	(26,560)	$	1,631,340		84.02%
CMO/REMIC - residential		259,180		644		(4,178)		255,646		13.17%
Municipal bonds		54,416		445		(993)		53,868		2.77%
Other securities		738		-		-		738		0.04%

Total available-for-sale securities	$	1,970,076	$	3,247	$	(31,731)	$	1,941,592		100.00%

Investment securities held-to-maturity:
Government agency/GSE	$	154,194	$	473	$	(2,453)	$	152,214		19.32%
Residential mortgage-backed securities		170,573		-		(3,191)		167,382		21.36%
CMO		221,051		-		(11,522)		209,529		27.69%
Municipal bonds		252,466		760		(6,221)		247,005		31.63%

Total held-to-maturity securities	$	798,284	$	1,233	$	(23,387)	$	776,130		100.00%


	December 31, 2017
	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss		Fair Value		Total Percent
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,747,780	$	11,231	$	(8,102)	$	1,750,909		84.14%
CMO/REMIC - residential		274,634		1,277		(2,082)		273,829		13.16%
Municipal bonds		54,966		774		(244)		55,496		2.66%
Other securities		751		-		-		751		0.04%

Total available-for-sale securities	$	2,078,131	$	13,282	$	(10,428)	$	2,080,985		100.00%

Investment securities held-to-maturity:
Government agency/GSE	$	159,716	$	854	$	(2,134)	$	158,436		19.25%
Residential mortgage-backed securities		176,427		667		(382)		176,712		21.26%
CMO		225,072		-		(8,641)		216,431		27.12%
Municipal bonds		268,675		2,751		(3,790)		267,636		32.37%

Total held-to-maturity securities	$	829,890	$	4,272	$	(14,947)	$	819,215		100.00%

Summary of Interest Income Earned on Investment Securities

The following table provides information about the amount of interest income earned on investment securities which is fully taxable and which is exempt from regular federal income tax.


	For the Three Months Ended
	March 31,
	2018		2017
	(Dollars in thousands)
Investment securities available-for-sale:
Taxable	$	11,445	$	11,926
Tax-advantaged		423		714

Total interest income from available-for-sale securities		11,868		12,640

Investment securities held-to-maturity:
Taxable		2,878		3,277
Tax-advantaged		1,887		2,230

Total interest income from held-to-maturity securities		4,765		5,507

Total interest income from investment securities	$	16,633	$	18,147

Summary of Continuous Unrealized Loss Position of Securities


	March 31, 2018
	Less Than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses		Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	1,131,944	$	(15,259)	$	286,313	$	(11,301)	$	1,418,257	$	(26,560)
CMO/REMIC - residential		132,728		(1,662)		67,578		(2,516)		200,306		(4,178)
Municipal bonds		9,363		(156)		13,357		(837)		22,720		(993)

Total available-for-sale securities	$	1,274,035	$	(17,077)	$	367,248	$	(14,654)	$	1,641,283	$	(31,731)

Investment securities held-to-maturity:
Government agency/GSE	$	53,538	$	(262)	$	42,693	$	(2,191)	$	96,231	$	(2,453)
Residential mortgage-backed securities		115,425		(1,649)		51,956		(1,542)		167,381		(3,191)
CMO		-		-		209,529		(11,522)		209,529		(11,522)
Municipal bonds		97,851		(1,714)		57,679		(4,507)		155,530		(6,221)

Total held-to-maturity securities	$	266,814	$	(3,625)	$	361,857	$	(19,762)	$	628,671	$	(23,387)


	December 31, 2017
	Less Than 12 Months					12 Months or Longer					Total
	Fair Value		Gross Unrealized Holding Losses			Fair Value		Gross Unrealized Holding Losses			Fair Value		Gross Unrealized Holding Losses
	(Dollars in thousands)
Investment securities available-for-sale:
Residential mortgage-backed securities	$	414,091	$	(1,828	)	$	303,746	$	(6,274	)	$	717,837	$	(8,102	)
CMO/REMIC - residential		95,137		(487	)		71,223		(1,595	)		166,360		(2,082	)
Municipal bonds		946		(4	)		13,956		(240	)		14,902		(244	)

Total available-for-sale securities	$	510,174	$	(2,319	)	$	388,925	$	(8,109	)	$	899,099	$	(10,428	)


Investment securities held-to-maturity:
Government agency/GSE	$	18,950	$	(27	)	$	43,495	$	(2,107	)	$	62,445	$	(2,134	)
Residential mortgage-backed securities		51,297		(188	)		55,306		(194	)		106,603		(382	)
CMO		-		-			216,431		(8,641	)		216,431		(8,641	)
Municipal bonds		32,069		(492	)		66,217		(3,298	)		98,286		(3,790	)

Total held-to-maturity securities	$	102,316	$	(707	)	$	381,449	$	(14,240	)	$	483,765	$	(14,947	)

Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Mortgage-backed and CMO/REMIC securities are included in maturity categories based upon estimated average lives which incorporate estimated prepayment speeds.


	March 31, 2018
	Available-for-sale				Held-to-maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(Dollars in thousands)
Due in one year or less	$	24,088	$	24,417	$	459	$	450
Due after one year through five years		1,718,590		1,694,629		148,566		144,099
Due after five years through ten years		192,161		188,031		283,808		276,367
Due after ten years		35,237		34,515		365,451		355,214

Total investment securities	$	1,970,076	$	1,941,592	$	798,284	$	776,130

Acquired SJB Assets and FDIC Loss Sharing Asset (Tables)

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Summary of PCI Loans and Lease Finance Receivables

The following table provides a summary of PCI loans and lease finance receivables by type and by internal risk ratings (credit quality indicators) for the periods indicated.


	March 31, 2018		December 31, 2017
	(Dollars in thousands)
Commercial and industrial	$	908	$	934
SBA		1,356		1,383
Real estate:
Commercial real estate		24,275		27,431
Construction		-		-
SFR mortgage		158		162
Dairy & livestock and agribusiness		10		770
Municipal lease finance receivables		-		-
Consumer and other loans		228		228

Gross PCI loans		26,935		30,908
Less: Purchase accounting discount		(1,074)		(2,026)

Gross PCI loans, net of discount		25,861		28,882
Less: Allowance for PCI loan losses		(312)		(367)

Net PCI loans	$	25,549	$	28,515

Summary of Gross PCI Loans by Internal Risk Ratings by Loans

The following table summarizes gross PCI loans by internal risk ratings for the periods indicated.


	March 31, 2018		December 31, 2017
	(Dollars in thousands)
Pass	$	22,892	$	26,439
Special mention		1,066		1,088
Substandard		2,977		3,381
Doubtful & loss		-		-

Total gross PCI loans	$	26,935	$	30,908

Loans and Lease Finance Receivables and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Summary of Components of Loans and Lease Finance Receivables, Excluding PCI Loans

The following table provides a summary of the Company’s total loans and lease finance receivables, excluding PCI loans, by type.


	March 31, 2018			December 31, 2017
	(Dollars in thousands)

Commercial and industrial	$	514,229		$	513,325
SBA		123,432			122,055
Real estate:
Commercial real estate		3,411,216			3,376,713
Construction		79,898			77,982
SFR mortgage		237,618			236,202
Dairy & livestock and agribusiness		276,379			347,289
Municipal lease finance receivables		67,892			70,243
Consumer and other loans		64,159			64,229

Gross loans, excluding PCI loans		4,774,823			4,808,038
Less: Deferred loan fees, net		(5,701	)		(6,289	)

Gross loans, excluding PCI loans, net of deferred loan fees		4,769,122			4,801,749
Less: Allowance for loan losses		(59,623	)		(59,218	)

Net loans, excluding PCI loans		4,709,499			4,742,531

PCI Loans		26,935			30,908
Discount on PCI loans		(1,074	)		(2,026	)
Less: Allowance for loan losses		(312	)		(367	)

PCI loans, net		25,549			28,515

Total loans and lease finance receivables	$	4,735,048		$	4,771,046

Summary of Loan, Excluding PCI Loans by Internal Risk Ratings

The following table summarizes loans by type, excluding PCI loans, according to our internal risk ratings for the periods presented.


	March 31, 2018
	Pass		Special Mention		Substandard		Doubtful & Loss		Total
	(Dollars in thousands)
Commercial and industrial	$	486,079	$	17,312	$	10,838	$	-	$	514,229
SBA		114,632		5,294		3,506		-		123,432
Real estate:
Commercial real estate
Owner occupied		1,017,210		73,607		4,913		-		1,095,730
Non-owner occupied		2,291,202		18,337		5,947		-		2,315,486
Construction
Speculative		63,544		-		-		-		63,544
Non-speculative		16,354		-		-		-		16,354
SFR mortgage		230,517		3,100		4,001		-		237,618
Dairy & livestock and agribusiness		253,498		12,706		10,175		-		276,379
Municipal lease finance receivables		67,324		568		-		-		67,892
Consumer and other loans		62,225		1,113		821		-		64,159

Total gross loans, excluding PCI loans	$	4,602,585	$	132,037	$	40,201	$	-	$	4,774,823


	December 31, 2017
	Pass		Special Mention		Substandard		Doubtful & Loss		Total
	(Dollars in thousands)
Commercial and industrial	$	483,641	$	19,566	$	10,118	$	-	$	513,325
SBA		112,835		5,358		3,862		-		122,055
Real estate:
Commercial real estate
Owner occupied		1,009,199		76,111		10,970		-		1,096,280
Non-owner occupied		2,257,130		16,434		6,869		-		2,280,433
Construction
Speculative		60,042		-		-		-		60,042
Non-speculative		17,940		-		-		-		17,940
SFR mortgage		229,032		3,124		4,046		-		236,202
Dairy & livestock and agribusiness		321,413		9,047		16,829		-		347,289
Municipal lease finance receivables		69,644		599		-		-		70,243
Consumer and other loans		61,715		1,255		1,259		-		64,229

Total gross loans, excluding PCI loans	$	4,622,591	$	131,494	$	53,953	$	-	$	4,808,038

Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type

The following tables present the balance and activity related to the allowance for loan losses for held-for-investment loans by type for the periods presented.


	For the Three Months Ended March 31, 2018
	Ending Balance December 31, 2017		Charge-offs			Recoveries		(Recapture of) Provision for Loan Losses			Ending Balance March 31, 2018
	(Dollars in thousands)
Commercial and industrial	$	7,280	$	-		$	10	$	209		$	7,499
SBA		869		-			5		10			884
Real estate:
Commercial real estate		41,722		-			-		141			41,863
Construction		984		-			1,334		(1,331	)		987
SFR mortgage		2,112		-			-		90			2,202
Dairy & livestock and agribusiness		4,647		-			-		19			4,666
Municipal lease finance receivables		851		-			-		(17	)		834
Consumer and other loans		753			(7)		8		(66	)		688
PCI loans		367		-			-		(55	)		312

Total allowance for loan losses	$	59,585	$		(7)	$	1,357	$	(1,000	)	$	59,935


	For the Three Months Ended March 31, 2017
	Ending Balance December 31, 2016		Charge-offs			Recoveries		(Recapture of) Provision for Loan Losses			Ending Balance March 31, 2017
	(Dollars in thousands)
Commercial and industrial	$	8,154	$	-		$	52	$	(250	)	$	7,956
SBA		871		-			4		(4	)		871
Real estate:
Commercial real estate		37,443		-			-		1,543			38,986
Construction		1,096		-			2,025		(2,301	)		820
SFR mortgage		2,287		-			64		(165	)		2,186
Dairy & livestock and agribusiness		8,541		-			-		(2,699	)		5,842
Municipal lease finance receivables		941		-			-		(52	)		889
Consumer and other loans		988		(2	)		29		(78	)		937
PCI loans		1,219		-			-		(494	)		725

Total allowance for loan losses	$	61,540	$	(2	)	$	2,174	$	(4,500	)	$	59,212

Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type


	March 31, 2018
	Recorded Investment in Loans						Allowance for Loan Losses
	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality
					(Dollars in thousands)
Commercial and industrial	$	432	$	513,797	$	-	$	-	$	7,499	$	-
SBA		1,201		122,231		-		-		884		-
Real estate:
Commercial real estate		7,992		3,403,224		-		-		41,863		-
Construction		-		79,898		-		-		987		-
SFR mortgage		3,576		234,042		-		-		2,202		-
Dairy & livestock and agribusiness		818		275,561		-		-		4,666		-
Municipal lease finance receivables		-		67,892		-		-		834		-
Consumer and other loans		438		63,721		-		-		688		-
PCI loans		-		-		25,861		-		-		312

Total	$	14,457	$	4,760,366	$	25,861	$	-	$	59,623	$	312


	March 31, 2017
	Recorded Investment in Loans						Allowance for Loan Losses
	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Acquired with Deterioriated Credit Quality
					(Dollars in thousands)
Commercial and industrial	$	1,150	$	527,795	$	-	$	88	$	7,868	$	-
SBA		1,926		110,764		-		9		862		-
Real estate:
Commercial real estate		20,216		3,199,083		-		-		38,986		-
Construction		384		72,398		-		-		820		-
SFR mortgage		4,248		241,114		-		-		2,186		-
Dairy & livestock and agribusiness		1,324		242,940		-		-		5,842		-
Municipal lease finance receivables		-		62,416		-		-		889		-
Consumer and other loans		801		79,362		-		-		937		-
PCI loans		-		-		56,527		-		-		725

Total	$	30,049	$	4,535,872	$	56,527	$	97	$	58,390	$	725

Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Excluding PCI Loans by Class of Loans

The following tables present the recorded investment in, and the aging of, past due and nonaccrual loans, excluding PCI loans, by type of loans for the periods presented.


	March 31, 2018
	30-59 Days Past Due		60-89 Days Past Due		Total Past Due and Accruing		Nonaccrual (1)		Current		Total Loans and Financing Receivables
	(Dollars in thousands)
Commercial and industrial	$	-	$	-	$	-	$	272	$	513,957	$	514,229
SBA		-		-		-		589		122,843		123,432
Real estate:
Commercial real estate
Owner occupied		-		-		-		4,332		1,091,398		1,095,730
Non-owner occupied		-		-		-		2,414		2,313,072		2,315,486
Construction
Speculative (2)		-		-		-		-		63,544		63,544
Non-speculative		-		-		-		-		16,354		16,354
SFR mortgage		680		-		680		1,309		235,629		237,618
Dairy & livestock and agribusiness		-		-		-		818		275,561		276,379
Municipal lease finance receivables		-		-		-		-		67,892		67,892
Consumer and other loans		63		-		63		438		63,658		64,159

Total gross loans, excluding PCI loans	$	743	$	-	$	743	$	10,172	$	4,763,908	$	4,774,823

(1)

As of March 31, 2018, $3.6 million of nonaccruing loans were current, $431,000 were 30-59 days past due, and $6.2 million were 90+ days past due.

(2)

Speculative construction loans are generally for properties where there is no identified buyer or renter.


	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		Total Past Due and Accruing		Nonaccrual (1)		Current		Total Loans and Financing Receivables
	(Dollars in thousands)
Commercial and industrial	$	768	$	-	$	768	$	250	$	512,307	$	513,325
SBA		403		-		403		906		120,746		122,055
Real estate:
Commercial real estate
Owner occupied		-		-		-		4,365		1,091,915		1,096,280
Non-owner occupied		-		-		-		2,477		2,277,956		2,280,433
Construction
Speculative (2)		-		-		-		-		60,042		60,042
Non-speculative		-		-		-		-		17,940		17,940
SFR mortgage		-		-		-		1,337		234,865		236,202
Dairy & livestock and agribusiness		-		-		-		829		346,460		347,289
Municipal lease finance receivables		-		-		-		-		70,243		70,243
Consumer and other loans		1		-		1		552		63,676		64,229

Total gross loans, excluding PCI loans	$	1,172	$	-	$	1,172	$	10,716	$	4,796,150	$	4,808,038

(1)

As of December 31, 2017, $3.6 million of nonaccruing loans were current, $376,000 were 60-89 days past due and $6.8 million were 90+ days past due.

(2)

Speculative construction loans are generally for properties where there is no identified buyer or renter.

Schedule of Held-for-Investment Loans, Excluding PCI Loans, Individually Evaluated for Impairment by Class of Loans

The following tables present information for held-for-investment loans, excluding PCI loans, individually evaluated for impairment by type of loans, as and for the periods presented.


	As of and For the Three Months Ended
	March 31, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	432	$	986	$	-	$	461	$	2
SBA		1,201		1,327		-		1,220		12
Real estate:
Commercial real estate
Owner occupied		4,332		4,755		-		4,348		-
Non-owner occupied		3,660		5,033		-		3,715		22
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		3,576		4,236		-		3,599		25
Dairy & livestock and agribusiness		818		1,091		-		826		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		438		640		-		519		-

Total		14,457		18,068		-		14,688		61

With a related allowance recorded:
Commercial and industrial		-		-		-		-		-
SBA		-		-		-		-		-
Real estate:
Commercial real estate
Owner occupied		-		-		-		-		-
Non-owner occupied		-		-		-		-		-
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		-		-		-		-		-

Total		-		-		-		-		-

Total impaired loans	$	14,457	$	18,068	$	-	$	14,688	$	61

	As of and For the Three Months Ended
	March 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	1,015	$	1,985	$	-	$	1,045	$	6
SBA		1,917		2,272		-		1,960		16
Real estate:
Commercial real estate
Owner occupied		6,669		7,081		-		6,434		32
Non-owner occupied		13,547		16,198		-		13,479		401
Construction
Speculative		384		402		-		384		-
Non-speculative		-		-		-		-		-
SFR mortgage		4,248		5,024		-		4,259		34
Dairy & livestock and agribusiness		1,324		1,610		-		1,839		1
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		801		1,379		-		809		5

Total		29,905		35,951		-		30,209		495

With a related allowance recorded:
Commercial and industrial		135		136		88		152		2
SBA		9		25		9		10		-
Real estate:
Commercial real estate
Owner occupied		-		-		-		-		-
Non-owner occupied		-		-		-		-		-
Construction
Speculative		-		-		-		-		-
Non-speculative		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Municipal lease finance receivables		-		-		-		-		-
Consumer and other loans		-		-		-		-		-

Total		144		161		97		162		2

Total impaired loans	$	30,049	$	36,112	$	97	$	30,371	$	497


	As of December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance
	(Dollars in thousands)
With no related allowance recorded:
Commercial and industrial	$	440	$	980	$	-
SBA		1,530		1,699		-
Real estate:
Commercial real estate
Owner occupied		4,365		4,763		-
Non-owner occupied		3,768		5,107		-
Construction
Speculative		-		-		-
Non-speculative		-		-		-
SFR mortgage		4,040		4,692		-
Dairy & livestock and agribusiness		829		1,091		-
Municipal lease finance receivables		-		-		-
Consumer and other loans		174		370		-

Total		15,146		18,702		-

With a related allowance recorded:
Commercial and industrial		-		-		-
SBA		1		18		1
Real estate:
Commercial real estate
Owner occupied		-		-		-
Non-owner occupied		-		-		-
Construction
Speculative		-		-		-
Non-speculative		-		-		-
SFR mortgage		-		-		-
Dairy & livestock and agribusiness		-		-		-
Municipal lease finance receivables		-		-		-
Consumer and other loans		378		391		74

Total		379		409		75

Total impaired loans	$	15,525	$	19,111	$	75

Summary of Activity Related to Troubled Debt Restructurings

The following table provides a summary of the activity related to TDRs for the periods presented.


	For the Three Months Ended
	March 31,
	2018			2017
	(Dollars in thousands)
Performing TDRs:
Beginning balance	$	4,809		$	19,233
New modifications		-			3,143
Payoffs/payments, net and other		(524	)		(3,003	)
TDRs returned to accrual status		-			329
TDRs placed on nonaccrual status		-			-

Ending balance	$	4,285		$	19,702

Nonperforming TDRs:
Beginning balance	$	4,200		$	1,626
New modifications		-			2,066
Charge-offs		-			-
Payoffs/payments, net and other		(291	)		(1,956	)
TDRs returned to accrual status		-			(329	)
TDRs placed on nonaccrual status		-			-

Ending balance	$	3,909		$	1,407

Total TDRs	$	8,194		$	21,109

Summary of Loans Modified as Troubled Debt Restructurings

The following table summarizes loans modified as troubled debt restructurings for the period presented.


Modifications (1)

	For the Three Months Ended March 31, 2017
	Number of Loans		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Outstanding Recorded Investment at March 31, 2017		Financial Effect Resulting From Modifications (2)
	(Dollars in thousands)
Commercial and industrial:
Interest rate reduction		-	$	-	$	-	$	-	$	-
Change in amortization period or maturity		-		-		-		-		-
SBA:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		-		-		-		-		-
Real estate:
Commercial real estate:
Owner occupied
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		3,143		3,143		3,143		-
Non-owner occupied
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		-		-		-		-		-
Dairy & livestock and agribusiness:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		1,984		1,984		78		-
Consumer:
Interest rate reduction		-		-		-		-		-
Change in amortization period or maturity		1		82		82		80		-

Total loans		3	$	5,209	$	5,209	$	3,301	$	-

(1)

The tables above exclude modified loans that were paid off prior to the end of the period.

(2)

Financial effects resulting from modifications represent charge-offs and specific allowance recorded at modification date.

Earnings Per Share Reconciliation (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Common Share Reconciliation

The table below shows earnings per common share and diluted earnings per common share, and reconciles the numerator and denominator of both earnings per common share calculations.


	For the Three Months Ended March 31,
	2018		2017
	(In thousands, except per share amounts)
Earnings per common share:
Net earnings	$	34,913	$	28,504
Less: Net earnings allocated to restricted stock		108		112

Net earnings allocated to common shareholders	$	34,805	$	28,392

Weighted average shares outstanding		109,859		108,339
Basic earnings per common share	$	0.32	$	0.26


Diluted earnings per common share:
Net income allocated to common shareholders	$	34,805	$	28,392

Weighted average shares outstanding		109,859		108,339
Incremental shares from assumed exercise of outstanding options		364		467

Diluted weighted average shares outstanding		110,223		108,806
Diluted earnings per common share	$	0.32	$	0.26

Fair Value Information (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The tables below present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented.


	Carrying Value at March 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
Description of assets
Investment securities - AFS:
Residential mortgage-backed securities	$	1,631,340	$	-	$	1,631,340	$	-
CMO/REMIC - residential		255,646		-		255,646		-
Municipal bonds		53,868		-		53,868		-
Other securities		738		-		738		-

Total investment securities - AFS		1,941,592		-		1,941,592		-
Interest rate swaps		1,645		-		1,645		-

Total assets	$	1,943,237	$	-	$	1,943,237	$	-

Description of liability
Interest rate swaps	$	1,645	$	-	$	1,645	$	-

Total liabilities	$	1,645	$	-	$	1,645	$	-


	Carrying Value at December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
Description of assets
Investment securities - AFS:
Residential mortgage-backed securities	$	1,750,909	$	-	$	1,750,909	$	-
CMO/REMIC - residential		273,829		-		273,829		-
Municipal bonds		55,496		-		55,496		-
Other securities		751		-		751		-

Total investment securities - AFS		2,080,985		-		2,080,985		-
Interest rate swaps		3,211		-		3,211		-

Total assets	$	2,084,196	$	-	$	2,084,196	$	-

Description of liability
Interest rate swaps	$	3,211	$	-	$	3,211	$	-

Total liabilities	$	3,211	$	-	$	3,211	$	-

Assets and Liabilities Measured at Fair Value on Non-Recurring Basis

the following tables provide the level of valuation assumptions used to determine each adjustment and the carrying value of the related assets that had losses during the period.


	Carrying Value at December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Losses For the Year Ended December 31, 2017
	(Dollars in thousands)
Description of assets
Impaired loans, excluding PCI loans:
Commercial and industrial	$	-	$	-	$	-	$	-	$	-
SBA		-		-		-		-		-
Real estate:
Commercial real estate		-		-		-		-		-
Construction		-		-		-		-		-
SFR mortgage		-		-		-		-		-
Dairy & livestock and agribusiness		-		-		-		-		-
Consumer and other loans		378		-		-		378		74
Other real estate owned		-		-		-		-		-
Asset held-for-sale		-		-		-		-		-

Total assets	$	378	$	-	$	-	$	378	$	74

Estimated Fair Value of Financial Instruments

The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.


	March 31, 2018
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Total cash and cash equivalents	$	456,238	$	456,238	$	-	$	-	$	456,238
Interest-earning balances due from depository institutions		10,100		-		10,095		-		10,095
FHLB stock		17,688		-		17,688		-		17,688
Investment securities available-for-sale		1,941,592		-		1,941,592		-		1,941,592
Investment securities held-to-maturity		798,284		-		776,130		-		776,130
Total loans, net of allowance for loan losses (1)		4,735,048		-		-		4,555,459		4,555,459
Swaps		1,645		-		1,645		-		1,645
Liabilities
Deposits:
Noninterest-bearing	$	4,062,691	$	4,062,691	$	-	$	-	$	4,062,691
Interest-bearing		2,646,744		-		2,643,627		-		2,643,627
Borrowings		487,277		-		486,924		-		486,924
Junior subordinated debentures		25,774		-		-		19,909		19,909
Swaps		1,645		-		1,645		-		1,645

	December 31, 2017
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Total cash and due from banks	$	144,377	$	144,377	$	-	$	-	$	144,377
Interest-earning balances due from depository institutions		17,952		-		17,951		-		17,951
FHLB stock		17,688		-		17,688		-		17,688
Investment securities available-for-sale		2,080,985		-		2,080,985		-		2,080,985
Investment securities held-to-maturity		829,890		-		819,215		-		819,215
Total loans, net of allowance for loan losses		4,771,046		-		-		4,678,402		4,678,402
Swaps		3,211		-		3,211		-		3,211
Liabilities
Deposits:
Noninterest-bearing	$	3,846,436	$	3,846,436	$	-	$	-	$	3,846,436
Interest-bearing		2,700,417		-		2,697,781		-		2,697,781
Borrowings		553,773		-		553,416		-		553,416
Junior subordinated debentures		25,774		-		-		18,070		18,070
Swaps		3,211		-		3,211		-		3,211

(1)

The fair value of loans as of March 31, 2018 was measured using an exit price notion.

Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

The following tables present the operating results and other key financial measures for the individual operating segments for the periods presented.


	For the Three Months Ended March 31, 2018
	Centers		Dairy & livestock and agribusiness		Other (1)			Total
	(Dollars in thousands)
Net interest income	$	49,583	$	3,851	$	17,087		$	70,521
(Recapture of) provision for loan losses		329		19		(1,348	)		(1,000	)

Net interest income after (recapture of) provision for loan losses		49,254		3,832		18,435			71,521

Noninterest income		5,301		45		7,570			12,916
Noninterest expense		13,225		517		22,204			35,946

Segment pre-tax profit	$	41,330	$	3,360	$	3,801		$	48,491

Goodwill	$	116,564	$	-	$	-		$	116,564

Segment assets as of March 31, 2018	$	7,231,624	$	407,527	$	717,009		$	8,356,160

(1)

Includes the elimination of certain items that are included in more than one department, most of which represents products and services for Centers’ customers.


	For the Three Months Ended March 31, 2017
	Centers		Dairy & livestock and agribusiness			Other (1)			Total
	(Dollars in thousands)
Net interest income	$	45,578	$	2,144		$	17,711		$	65,433
(Recapture of) provision for loan losses		511		(2,699	)		(2,312	)		(4,500	)

Net interest income after (recapture of) provision for loan losses		45,067		4,843			20,023			69,933

Noninterest income		5,207		55			3,460			8,722
Noninterest expense		12,438		501			21,178			34,117

Segment pre-tax profit	$	37,836	$	4,397		$	2,305		$	44,538

Goodwill	$	119,193	$	-		$	-		$	119,193

Segment assets as of March 31, 2017	$	7,399,909	$	363,029		$	796,183		$	8,559,121

(1)

Includes the elimination of certain items that are included in more than one department, most of which represents products and services for Centers’ customers.

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivative Instruments

March 31, 2018

Asset Derivatives

Liability Derivatives

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

(Dollars in thousands)

Derivatives not designated as hedging instruments:

Interest rate swaps

Other assets

1,645

Other liabilities

1,645

Total derivatives

1,645

December 31, 2017

Asset Derivatives

Liability Derivatives

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

(Dollars in thousands)

Derivatives not designated as hedging instruments:

Interest rate swaps

Other assets

3,211

Other liabilities

3,211

Total derivatives

3,211

Effect of Derivative Instruments on Consolidated Statement of Earnings

The following table summarizes the effect of derivative financial instruments on the condensed consolidated statement of earnings for the periods presented.


Derivatives Not Designated as Hedging Instruments	Location of Gain Recognized in Income on Derivative Instruments		Amount of Gain Recognized in Income on Derivative Instruments
			For the Three Months Ended March 31,
			2018		2017
			(Dollars in thousands)
Interest rate swaps		Other income	$	116	$	323

Total			$	116	$	323

Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Summary of Components of Other Comprehensive Income

The table below provides a summary of the components of other comprehensive income (“OCI”) for the periods presented.


	For the Three Months Ended March 31,
	2018									2017
	Before-tax			Tax effect			After-tax			Before-tax			Tax effect			After-tax
	(Dollars in thousands)
Investment securities:
Net change in fair value recorded in accumulated OCI	$	(31,338	)	$	(9,265	)	$	(22,073	)	$	1,207		$	507		$	700
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity		(832	)		(246	)		(586	)		(783	)		(329	)		(454	)

Net change	$	(32,170	)	$	(9,511	)	$	(22,659	)	$	424		$	178		$	246

Balance Sheet Offsetting (Tables)

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Schedule of Balance Sheet Offsetting

The repurchase agreements are not offset in the condensed consolidated balances.


	Gross Amounts Recognized in the Condensed		Gross Amounts Offset in the Condensed			Net Amounts of Assets Presented in the Condensed		Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
	Consolidated Balance Sheets		Consolidated Balance Sheets			Consolidated Balance Sheets		Financial Instruments		Collateral Pledged			Net Amount
	(Dollars in thousands)
March 31, 2018
Financial assets:
Derivatives not designated as hedging instruments	$	1,645	$	-		$	-	$	1,645	$	-		$	1,645

Total	$	1,645	$	-		$	-	$	1,645	$	-		$	1,645


Financial liabilities:
Derivatives not designated as hedging instruments	$	5,014	$	(3,369	)	$	1,645	$	3,369	$	(12,526	)	$	(7,512	)
Repurchase agreements		487,277		-			487,277		-		(626,413	)		(139,136	)

Total	$	492,291	$	(3,369	)	$	488,922	$	3,369	$	(638,939	)	$	(146,648	)


December 31, 2017
Financial assets:
Derivatives not designated as hedging instruments	$	3,211	$	-		$	-	$	3,211	$	-		$	3,211

Total	$	3,211	$	-		$	-	$	3,211	$	-		$	3,211


Financial liabilities:
Derivatives not designated as hedging instruments	$	4,495	$	(1,284	)	$	3,211	$	1,284	$	(12,760	)	$	(8,265	)
Repurchase agreements		553,773		-			553,773		-		(573,759	)		(19,986	)

Total	$	558,268	$	(1,284	)	$	556,984	$	1,284	$	(586,519	)	$	(28,251	)

Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606 (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606

The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2018 and 2017.


	For the Three Months Ended March 31,
	2018		2017
	(Dollars in thousands)
Noninterest income:
In-scope of Topic 606:
Service charges on deposit accounts	$	4,045	$	3,727
Trust and investment services		2,157		2,296
Bankcard services		804		765
Other		1,391		1,219

Noninterest Income (in-scope of Topic 606)		8,397		8,007
Noninterest Income (out-of-scope of Topic 606)		4,519		715

Total noninterest income	$	12,916	$	8,722

Business - Additional Information (Detail) $ / shares in Units, $ in Millions	Feb. 26, 2018 USD ($) $ / shares	Mar. 31, 2018 Location Subsidiary	Dec. 31, 2017 USD ($)
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries \| Subsidiary		1
Bank operated banking centers, number \| Location		51
Bank operated trust office locations, number \| Location		3
Stock price \| $ / shares	$ 23.60
Community Bank [Member]
Schedule Of Description Of Company [Line Items]
Total assets			$ 3,750.0
Gross loans			2,740.0
Total deposits			$ 2,860.0
Number of share to be received in respect of each share of common stock	9.4595
Amount of cash paid per share \| $ / shares	$ 56.00
Merger transaction value	$ 885.2

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment upon adoption of ASU 2018-02	$ 0
Accumulated Other Comprehensive Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment upon adoption of ASU 2018-02	$ 356

Business Combinations - Additional Information (Detail)		3 Months Ended
Business Combinations - Additional Information (Detail)	Mar. 10, 2017 USD ($) Branch	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Acquisition date		Oct. 16, 2009
Goodwill		$ 116,564,000	$ 119,193,000	$ 116,564,000
Merger related expenses		$ 803,000	676,000
Valley Commerce Bancorp [Member]
Business Acquisition [Line Items]
Acquisition date		Mar. 10, 2017
Acquired assets and assumed liabilities for cash	$ 23,200,000
Assets and assumed all of the liabilities, stock	37,600,000
Goodwill	27,000,000
Total fair value of assets acquired	405,900,000
Cash and cash equivalents	28,300,000
FHLB stock	2,000,000
Loans and lease finance receivables	309,700,000
Fixed assets	5,300,000
Bank-Owned Life Insurance	9,400,000
Core deposit intangible assets	3,200,000
Other assets	21,000,000
Total fair value of liabilities assumed	368,300,000
Deposits	361,800,000
Other liabilities	$ 6,500,000
Merger related expenses		$ 0	$ 651,000
Valley Business Bank [Member]
Business Acquisition [Line Items]
Number of branches owned by merger company \| Branch	4

Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,970,076	$ 2,078,131
Gross Unrealized Holding Gain, Available-for-sale	3,247	13,282
Gross Unrealized Holding Loss, Available-for-sale	(31,731)	(10,428)
Fair Value, Available-for-sale	$ 1,941,592	$ 2,080,985
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 798,284	$ 829,890
Gross Unrealized Holding Gain, Held-to-maturity	1,233	4,272
Gross Unrealized Holding Loss, Held-to-maturity	(23,387)	(14,947)
Fair Value, Held-to-maturity	$ 776,130	$ 819,215
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 259,180	$ 274,634
Gross Unrealized Holding Gain, Available-for-sale	644	1,277
Gross Unrealized Holding Loss, Available-for-sale	(4,178)	(2,082)
Fair Value, Available-for-sale	$ 255,646	$ 273,829
Total Percent, Available-for-sale	13.17%	13.16%
Amortized Cost, Held-to-maturity	$ 221,051	$ 225,072
Gross Unrealized Holding Gain, Held-to-maturity	0	0
Gross Unrealized Holding Loss, Held-to-maturity	(11,522)	(8,641)
Fair Value, Held-to-maturity	$ 209,529	$ 216,431
Total Percent, Held-to-maturity	27.69%	27.12%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Held-to-maturity	$ 154,194	$ 159,716
Gross Unrealized Holding Gain, Held-to-maturity	473	854
Gross Unrealized Holding Loss, Held-to-maturity	(2,453)	(2,134)
Fair Value, Held-to-maturity	$ 152,214	$ 158,436
Total Percent, Held-to-maturity	19.32%	19.25%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,655,742	$ 1,747,780
Gross Unrealized Holding Gain, Available-for-sale	2,158	11,231
Gross Unrealized Holding Loss, Available-for-sale	(26,560)	(8,102)
Fair Value, Available-for-sale	$ 1,631,340	$ 1,750,909
Total Percent, Available-for-sale	84.02%	84.14%
Amortized Cost, Held-to-maturity	$ 170,573	$ 176,427
Gross Unrealized Holding Gain, Held-to-maturity	0	667
Gross Unrealized Holding Loss, Held-to-maturity	(3,191)	(382)
Fair Value, Held-to-maturity	$ 167,382	$ 176,712
Total Percent, Held-to-maturity	21.36%	21.26%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 54,416	$ 54,966
Gross Unrealized Holding Gain, Available-for-sale	445	774
Gross Unrealized Holding Loss, Available-for-sale	(993)	(244)
Fair Value, Available-for-sale	$ 53,868	$ 55,496
Total Percent, Available-for-sale	2.77%	2.66%
Amortized Cost, Held-to-maturity	$ 252,466	$ 268,675
Gross Unrealized Holding Gain, Held-to-maturity	760	2,751
Gross Unrealized Holding Loss, Held-to-maturity	(6,221)	(3,790)
Fair Value, Held-to-maturity	$ 247,005	$ 267,636
Total Percent, Held-to-maturity	31.63%	32.37%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 738	$ 751
Gross Unrealized Holding Gain, Available-for-sale	0	0
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 738	$ 751
Total Percent, Available-for-sale	0.04%	0.04%

Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 11,868	$ 12,640
Total interest income from held-to-maturity securities	4,765	5,507
Total investment income	16,633	18,147
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	11,445	11,926
Tax-advantaged	423	714
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	2,878	3,277
Tax-advantaged	$ 1,887	$ 2,230

Investment Securities - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Investment securities pledged as collateral	$ 1,900,000,000	$ 1,910,000,000
Investment in FHLB stock, impairment losses	$ 0
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage	89.00%

Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 1,274,035	$ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(17,077)	(2,319)
Fair Value, 12 Months or Longer, Available-for-sale	367,248	388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(14,654)	(8,109)
Fair Value, Available-for-sale	1,641,283	899,099
Gross Unrealized Holding Losses, Available-for-sale	(31,731)	(10,428)
Fair Value, Less Than 12 Months, Held-to-maturity	266,814	102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(3,625)	(707)
Fair Value, 12 Months or Longer, Held-to-maturity	361,857	381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(19,762)	(14,240)
Fair Value, Held-to-maturity	628,671	483,765
Gross Unrealized Holding Losses, Held-to-maturity	(23,387)	(14,947)
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	132,728	95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(1,662)	(487)
Fair Value, 12 Months or Longer, Available-for-sale	67,578	71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(2,516)	(1,595)
Fair Value, Available-for-sale	200,306	166,360
Gross Unrealized Holding Losses, Available-for-sale	(4,178)	(2,082)
Fair Value, Less Than 12 Months, Held-to-maturity	0	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0	0
Fair Value, 12 Months or Longer, Held-to-maturity	209,529	216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(11,522)	(8,641)
Fair Value, Held-to-maturity	209,529	216,431
Gross Unrealized Holding Losses, Held-to-maturity	(11,522)	(8,641)
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Held-to-maturity	53,538	18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(262)	(27)
Fair Value, 12 Months or Longer, Held-to-maturity	42,693	43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(2,191)	(2,107)
Fair Value, Held-to-maturity	96,231	62,445
Gross Unrealized Holding Losses, Held-to-maturity	(2,453)	(2,134)
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	1,131,944	414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(15,259)	(1,828)
Fair Value, 12 Months or Longer, Available-for-sale	286,313	303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(11,301)	(6,274)
Fair Value, Available-for-sale	1,418,257	717,837
Gross Unrealized Holding Losses, Available-for-sale	(26,560)	(8,102)
Fair Value, Less Than 12 Months, Held-to-maturity	115,425	51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(1,649)	(188)
Fair Value, 12 Months or Longer, Held-to-maturity	51,956	55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(1,542)	(194)
Fair Value, Held-to-maturity	167,381	106,603
Gross Unrealized Holding Losses, Held-to-maturity	(3,191)	(382)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	9,363	946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(156)	(4)
Fair Value, 12 Months or Longer, Available-for-sale	13,357	13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(837)	(240)
Fair Value, Available-for-sale	22,720	14,902
Gross Unrealized Holding Losses, Available-for-sale	(993)	(244)
Fair Value, Less Than 12 Months, Held-to-maturity	97,851	32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(1,714)	(492)
Fair Value, 12 Months or Longer, Held-to-maturity	57,679	66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(4,507)	(3,298)
Fair Value, Held-to-maturity	155,530	98,286
Gross Unrealized Holding Losses, Held-to-maturity	$ (6,221)	$ (3,790)

Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost, Held-to-maturity	$ 459
Due after one year through five years, Amortized Cost, Held-to-maturity	148,566
Due after five years through ten years, Amortized Cost, Held-to-maturity	283,808
Due after ten years, Amortized Cost, Held-to-maturity	365,451
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis	798,284
Due in one year or less, Fair Value, Held-to-maturity	450
Due after one year through five years, Fair Value, Held-to-maturity	144,099
Due after five years through ten years, Fair Value, Held-to-maturity	276,367
Due after ten years, Fair Value, Held-to-maturity	355,214
Total, Held-to-maturity, Fair Value	776,130
Due in one year or less, Amortized Cost, Available-for-sale	24,088
Due after one year through five years, Amortized Cost, Available-for-sale	1,718,590
Due after five years through ten years, Amortized Cost, Available-for-sale	192,161
Due after ten years, Amortized Cost, Available-for-sale	35,237
Amortized Cost, Available-for-sale	1,970,076	$ 2,078,131
Due in one year or less, Fair Value, Available-for-sale	24,417
Due after one year through five years, Fair Value, Available-for-sale	1,694,629
Due after five years through ten years, Fair Value, Available-for-sale	188,031
Due after ten years, Fair Value, Available-for-sale	34,515
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value	$ 1,941,592	$ 2,080,985

Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Business Combinations [Abstract]
Acquisition date	Oct. 16, 2009
Remaining discount associated with SJB loans	$ 1.1

Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans and Lease Finance Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Real estate:
Less: Purchase accounting discount	$ (1,100)
Gross PCI loans, net of discount	25,861		$ 56,527
Less: Allowance for PCI loan losses	(312)		(725)
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	908	$ 934
SBA	1,356	1,383
Real estate:
Commercial real estate	24,275	27,431
Construction	0	0
SFR mortgage	158	162
Dairy & livestock and agribusiness	10	770
Municipal lease finance receivables	0	0
Consumer and other loans	228	228
Gross PCI loans	26,935	30,908
Less: Purchase accounting discount	(1,074)	(2,026)
Gross PCI loans, net of discount	25,861	28,882	56,527
Less: Allowance for PCI loan losses	(312)	(367)	$ (725)
Net loans	$ 25,549	$ 28,515

Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Gross PCI Loans by Internal Risk Ratings by Loans (Detail) - PCI Loans [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	$ 26,935	$ 30,908
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	22,892	26,439
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	1,066	1,088
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	2,977	3,381
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	$ 0	$ 0

Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Components of Loans and Lease Finance Receivables, Excluding PCI Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding PCI loans, net of deferred loan fees	$ 4,794,983	$ 4,830,631
Less: Allowance for loan losses	(59,935)	(59,585)	$ (59,212)	$ (61,540)
Total loans and lease finance receivables	4,735,048	4,771,046
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	908	934
PCI Loans	26,935	30,908
SBA	1,356	1,383
Discount on PCI loans	(1,074)	(2,026)
Commercial real estate	24,275	27,431
Construction	0	0
SFR mortgage	158	162
Dairy & livestock and agribusiness	10	770
Municipal lease finance receivables	0	0
Consumer and other loans	228	228
Less: Allowance for loan losses	(312)	(367)	$ (725)	$ (1,219)
Net loans	25,549	28,515
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	514,229	513,325
SBA	123,432	122,055
Commercial real estate	3,411,216	3,376,713
Construction	79,898	77,982
SFR mortgage	237,618	236,202
Dairy & livestock and agribusiness	276,379	347,289
Municipal lease finance receivables	67,892	70,243
Consumer and other loans	64,159	64,229
Total gross loans, excluding PCI loans	4,774,823	4,808,038
Less: Deferred loan fees, net	(5,701)	(6,289)
Gross loans, excluding PCI loans, net of deferred loan fees	4,769,122	4,801,749
Less: Allowance for loan losses	(59,623)	(59,218)
Net loans	$ 4,709,499	$ 4,742,531

Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) Contract SecurityLoan	Mar. 31, 2017 USD ($) Contract	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total fixed rate loans held	$ 2,180,000,000
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank	3,620,000,000		$ 3,680,000,000
Loans held-for-sale	0		0
Impaired, at carrying value	14,457,000	$ 30,049,000	15,525,000
Loans classified as troubled debt restructured	8,200,000
Impaired, at carrying value	0	97,000	75,000
Provision for unfunded loan commitments	0	$ 0
Reserve for credit risk for undisbursed commitments	6,300,000		6,300,000
Allocation of allowance to troubled debt restructuring	$ 0		1,000
Number of loans modified as TDRs \| Contract	0	3
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted \| Contract	0	0
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	78.09%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	71.44%
Nonaccrual Small Business Administration Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 589,000
Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	818,000
Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	8,200,000
Nonaccrual Single Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,300,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	6,700,000
Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	438,000
Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	14,500,000
Loans classified as troubled debt restructured	$ 4,300,000
Number of performing loans \| SecurityLoan	15
Performing Financing Receivable [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 1,200,000
Number of loans \| SecurityLoan	2
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 2,300,000
Number of loans \| SecurityLoan	9
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 160,000
Number of loans \| SecurityLoan	3
Performing Financing Receivable [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 612,000
Number of loans \| SecurityLoan	1
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	$ 3,900,000
Loans classified as troubled debt restructured	3,900,000
Allowance Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	0
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	3,411,216,000		3,376,713,000
Dairy & livestock and agribusiness	276,379,000		347,289,000
Impaired, at carrying value			15,500,000
Outstanding balance	10,172,000		10,716,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	245,300,000		310,600,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	31,100,000		36,700,000
Loans, Excluding PCI Loans [Member] \| Nonaccrual Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	272,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	818,000		829,000
Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	272,000		250,000
Loans, Excluding PCI Loans [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 589,000		$ 906,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	5.96%		6.10%
Commercial real estate loans	$ 203,400,000		$ 206,100,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Dairy & Livestock Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	117,100,000		118,200,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Agricultural Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	$ 86,300,000		$ 87,900,000

Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loan, Excluding PCI Loans by Internal Risk Ratings (Detail) - Loans, Excluding PCI Loans [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	$ 514,229	$ 513,325
SBA	123,432	122,055
Commercial real estate, Owner occupied	1,095,730	1,096,280
Commercial real estate, Non-owner occupied	2,315,486	2,280,433
Construction, Speculative	63,544	60,042
Construction, Non-speculative	16,354	17,940
SFR mortgage	237,618	236,202
Dairy & livestock and agribusiness	276,379	347,289
Municipal lease finance receivables	67,892	70,243
Consumer and other loans	64,159	64,229
Total gross loans, excluding PCI loans	4,774,823	4,808,038
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	486,079	483,641
SBA	114,632	112,835
Commercial real estate, Owner occupied	1,017,210	1,009,199
Commercial real estate, Non-owner occupied	2,291,202	2,257,130
Construction, Speculative	63,544	60,042
Construction, Non-speculative	16,354	17,940
SFR mortgage	230,517	229,032
Dairy & livestock and agribusiness	253,498	321,413
Municipal lease finance receivables	67,324	69,644
Consumer and other loans	62,225	61,715
Total gross loans, excluding PCI loans	4,602,585	4,622,591
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	17,312	19,566
SBA	5,294	5,358
Commercial real estate, Owner occupied	73,607	76,111
Commercial real estate, Non-owner occupied	18,337	16,434
Construction, Speculative	0	0
Construction, Non-speculative	0	0
SFR mortgage	3,100	3,124
Dairy & livestock and agribusiness	12,706	9,047
Municipal lease finance receivables	568	599
Consumer and other loans	1,113	1,255
Total gross loans, excluding PCI loans	132,037	131,494
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	10,838	10,118
SBA	3,506	3,862
Commercial real estate, Owner occupied	4,913	10,970
Commercial real estate, Non-owner occupied	5,947	6,869
Construction, Speculative	0	0
Construction, Non-speculative	0	0
SFR mortgage	4,001	4,046
Dairy & livestock and agribusiness	10,175	16,829
Municipal lease finance receivables	0
Consumer and other loans	821	1,259
Total gross loans, excluding PCI loans	40,201	53,953
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	0	0
SBA	0	0
Commercial real estate, Owner occupied	0	0
Commercial real estate, Non-owner occupied	0	0
Construction, Speculative	0	0
Construction, Non-speculative	0	0
SFR mortgage	0	0
Dairy & livestock and agribusiness	0	0
Municipal lease finance receivables	0	0
Consumer and other loans	0	0
Total gross loans, excluding PCI loans	$ 0	$ 0

Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 59,585	$ 61,540
Charge-offs	(7)	(2)
Recoveries	1,357	2,174
(Recapture of) provision for loan losses	(1,000)	(4,500)
Ending Balance	59,935	59,212
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	367	1,219
Charge-offs	0	0
Recoveries	0	0
(Recapture of) provision for loan losses	(55)	(494)
Ending Balance	312	725
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,280	8,154
Charge-offs	0	0
Recoveries	10	52
(Recapture of) provision for loan losses	209	(250)
Ending Balance	7,499	7,956
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	869	871
Charge-offs	0	0
Recoveries	5	4
(Recapture of) provision for loan losses	10	(4)
Ending Balance	884	871
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	41,722	37,443
Charge-offs	0	0
Recoveries	0	0
(Recapture of) provision for loan losses	141	1,543
Ending Balance	41,863	38,986
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	984	1,096
Charge-offs	0	0
Recoveries	1,334	2,025
(Recapture of) provision for loan losses	(1,331)	(2,301)
Ending Balance	987	820
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,112	2,287
Charge-offs	0	0
Recoveries	0	64
(Recapture of) provision for loan losses	90	(165)
Ending Balance	2,202	2,186
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,647	8,541
Charge-offs	0	0
Recoveries	0	0
(Recapture of) provision for loan losses	19	(2,699)
Ending Balance	4,666	5,842
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	851	941
Charge-offs	0	0
Recoveries	0	0
(Recapture of) provision for loan losses	(17)	(52)
Ending Balance	834	889
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	753	988
Charge-offs	(7)	(2)
Recoveries	8	29
(Recapture of) provision for loan losses	(66)	(78)
Ending Balance	$ 688	$ 937

Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 14,457		$ 30,049
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,760,366		4,535,872
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	25,861		56,527
Allowance for Loan Losses, Individually Evaluated for Impairment	0		97
Allowance for Loan Losses, Collectively Evaluated for Impairment	59,623		58,390
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	312		725
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	0		0
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	25,861	$ 28,882	56,527
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	0		0
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	312	$ 367	725
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	432		1,150
Recorded Investment in Loans, Collectively Evaluated for Impairment	513,797		527,795
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		88
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,499		7,868
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,201		1,926
Recorded Investment in Loans, Collectively Evaluated for Impairment	122,231		110,764
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		9
Allowance for Loan Losses, Collectively Evaluated for Impairment	884		862
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	7,992		20,216
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,403,224		3,199,083
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	41,863		38,986
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		384
Recorded Investment in Loans, Collectively Evaluated for Impairment	79,898		72,398
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	987		820
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	3,576		4,248
Recorded Investment in Loans, Collectively Evaluated for Impairment	234,042		241,114
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,202		2,186
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	818		1,324
Recorded Investment in Loans, Collectively Evaluated for Impairment	275,561		242,940
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,666		5,842
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	67,892		62,416
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	834		889
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	438		801
Recorded Investment in Loans, Collectively Evaluated for Impairment	63,721		79,362
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	688		937
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	$ 0		$ 0

Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Excluding PCI Loans by Class of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing loans, current	$ 3,600	$ 3,600
30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	431
60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual		376
90+ Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	$ 6,200	$ 6,800

Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Excluding PCI Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 14,457	$ 29,905	$ 15,146
Recorded Investment, With a related allowance recorded	0	144	379
Recorded Investment, Total impaired loans	14,457	30,049	15,525
Unpaid Principal Balance, With no related allowance recorded	18,068	35,951	18,702
Unpaid Principal Balance, With a related allowance recorded	0	161	409
Unpaid Principal Balance, Total impaired loans	18,068	36,112	19,111
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	97	75
Related Allowance, Total impaired loans	0	97	75
Average Recorded Investment, With no related allowance recorded	14,688	30,209
Average Recorded Investment, With a related allowance recorded	0	162
Average Recorded Investment, Total impaired loans	14,688	30,371
Interest Income Recognized, With no related allowance recorded	61	495
Interest Income Recognized, With a related allowance recorded	0	2
Interest Income Recognized, Total impaired loans	61	497
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	432	1,015	440
Recorded Investment, With a related allowance recorded	0	135	0
Unpaid Principal Balance, With no related allowance recorded	986	1,985	980
Unpaid Principal Balance, With a related allowance recorded	0	136	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	88	0
Average Recorded Investment, With no related allowance recorded	461	1,045
Average Recorded Investment, With a related allowance recorded	0	152
Interest Income Recognized, With no related allowance recorded	2	6
Interest Income Recognized, With a related allowance recorded	0	2
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,201	1,917	1,530
Recorded Investment, With a related allowance recorded	0	9	1
Unpaid Principal Balance, With no related allowance recorded	1,327	2,272	1,699
Unpaid Principal Balance, With a related allowance recorded	0	25	18
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	9	1
Average Recorded Investment, With no related allowance recorded	1,220	1,960
Average Recorded Investment, With a related allowance recorded	0	10
Interest Income Recognized, With no related allowance recorded	12	16
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,332	6,669	4,365
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,755	7,081	4,763
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	4,348	6,434
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	32
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,660	13,547	3,768
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	5,033	16,198	5,107
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,715	13,479
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	22	401
Interest Income Recognized, With a related allowance recorded	0	0
Construction Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	384	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	402	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	384
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
Construction Non-speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,576	4,248	4,040
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,236	5,024	4,692
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,599	4,259
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	25	34
Interest Income Recognized, With a related allowance recorded	0	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	818	1,324	829
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	1,091	1,610	1,091
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	826	1,839
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	1
Interest Income Recognized, With a related allowance recorded	0	0
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	0	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	438	801	174
Recorded Investment, With a related allowance recorded	0	0	378
Unpaid Principal Balance, With no related allowance recorded	640	1,379	370
Unpaid Principal Balance, With a related allowance recorded	0	0	391
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	$ 74
Average Recorded Investment, With no related allowance recorded	519	809
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	5
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 8,194	$ 21,109
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	4,809	19,233
New modifications	0	3,143
Payoffs/payments, net and other	(524)	(3,003)
TDRs returned to accrual status	0	329
TDRs placed on nonaccrual status	0	0
Ending balance	4,285	19,702
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	4,200	1,626
New modifications	0	2,066
Charge-offs	0	0
Payoffs/payments, net and other	(291)	(1,956)
TDRs returned to accrual status	0	(329)
TDRs placed on nonaccrual status	0	0
Ending balance	$ 3,909	$ 1,407

Earnings Per Share Reconciliation - Additional Information (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per common share	16	1

Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings per common share:
Net earnings	$ 34,913	$ 28,504
Less: Net earnings allocated to restricted stock	108	112
Net earnings allocated to common shareholders	$ 34,805	$ 28,392
Weighted average shares outstanding	109,859	108,339
Basic earnings per common share	$ 0.32	$ 0.26
Diluted earnings per common share:
Net income allocated to common shareholders	$ 34,805	$ 28,392
Weighted average shares outstanding	109,859	108,339
Incremental shares from assumed exercise of outstanding options	364	467
Diluted weighted average shares outstanding	110,223	108,806
Diluted earnings per common share	$ 0.32	$ 0.26

Fair Value Information - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value assets transfers from Level 1 to Level 2	$ 0		$ 0
Fair value assets transfers from Level 2 to Level 1	0		0
Fair value liabilities transfers from Level 1 to Level 2	0		0
Fair value liabilities transfers from Level 2 to Level 1	0		$ 0
Fair Value on Non-Recurring Basis [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Total assets	$ 0	$ 74,000

Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	$ 488,922	$ 556,984
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	0	0
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	1,645	3,211
Interest rate swaps, liabilities	1,645	3,211
Fair Value on Recurring Basis [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Total liabilities	0	0
Fair Value on Recurring Basis [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,943,237	2,084,196
Total liabilities	1,645	3,211
Fair Value on Recurring Basis [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Total liabilities	0	0
Fair Value on Recurring Basis [Member] \| Municipal Bonds [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Municipal Bonds [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	53,868	55,496
Fair Value on Recurring Basis [Member] \| Municipal Bonds [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Residential Mortgage-backed Securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Residential Mortgage-backed Securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	1,631,340	1,750,909
Fair Value on Recurring Basis [Member] \| Residential Mortgage-backed Securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| CMO/REMIC - Residential [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| CMO/REMIC - Residential [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	255,646	273,829
Fair Value on Recurring Basis [Member] \| CMO/REMIC - Residential [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Other Securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Other Securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	738	751
Fair Value on Recurring Basis [Member] \| Other Securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Investment Securities-AFS [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Investment Securities-AFS [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	1,941,592	2,080,985
Fair Value on Recurring Basis [Member] \| Investment Securities-AFS [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	0
Fair Value on Recurring Basis [Member] \| Interest Rate Swaps [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	0	0
Interest rate swaps, liabilities	0	0
Fair Value on Recurring Basis [Member] \| Interest Rate Swaps [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	1,645	3,211
Interest rate swaps, liabilities	1,645	3,211
Fair Value on Recurring Basis [Member] \| Interest Rate Swaps [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	0	0
Interest rate swaps, liabilities	0	0
Fair Value on Recurring Basis [Member] \| Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,943,237	2,084,196
Total liabilities	1,645	3,211
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	53,868	55,496
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	1,631,340	1,750,909
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| CMO/REMIC - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	255,646	273,829
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	738	751
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| Investment Securities-AFS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	1,941,592	2,080,985
Fair Value on Recurring Basis [Member] \| Carrying Value [Member] \| Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, assets	1,645	3,211
Interest rate swaps, liabilities	$ 1,645	$ 3,211

Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets
Total cash and cash equivalents	$ 456,238	$ 144,377	$ 382,441	$ 121,633
Interest-earning balances due from depository institutions	10,100	17,952
FHLB stock	17,688	17,688
Investment securities available-for-sale	1,941,592	2,080,985
Investment securities held-to-maturity	798,284	829,890
Total loans, net of allowance for loan losses	4,735,048	4,771,046
Deposits:
Noninterest-bearing	4,062,691	3,846,436
Interest-bearing	2,646,744	2,700,417
Junior subordinated debentures	25,774	25,774
Swaps	488,922	556,984
Carrying Value [Member]
Assets
Total cash and cash equivalents	456,238	144,377
Interest-earning balances due from depository institutions	10,100	17,952
FHLB stock	17,688	17,688
Investment securities available-for-sale	1,941,592	2,080,985
Investment securities held-to-maturity	798,284	829,890
Total loans, net of allowance for loan losses	4,735,048	4,771,046
Swaps	1,645	3,211
Deposits:
Noninterest-bearing	4,062,691	3,846,436
Interest-bearing	2,646,744	2,700,417
Borrowings	487,277	553,773
Junior subordinated debentures	25,774	25,774
Swaps	1,645	3,211
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	456,238	144,377
Interest-earning balances due from depository institutions	10,095	17,951
FHLB stock	17,688	17,688
Investment securities available-for-sale	1,941,592	2,080,985
Investment securities held-to-maturity	776,130	819,215
Total loans, net of allowance for loan losses	4,555,459	4,678,402
Swaps	1,645	3,211
Deposits:
Noninterest-bearing	4,062,691	3,846,436
Interest-bearing	2,643,627	2,697,781
Borrowings	486,924	553,416
Junior subordinated debentures	19,909	18,070
Swaps	1,645	3,211
Estimated Fair Value [Member] \| Level 1 [Member]
Assets
Total cash and cash equivalents	456,238	144,377
Interest-earning balances due from depository institutions	0	0
FHLB stock	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Total loans, net of allowance for loan losses	0	0
Swaps	0	0
Deposits:
Noninterest-bearing	4,062,691	3,846,436
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Swaps	0	0
Estimated Fair Value [Member] \| Level 2 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	10,095	17,951
FHLB stock	17,688	17,688
Investment securities available-for-sale	1,941,592	2,080,985
Investment securities held-to-maturity	776,130	819,215
Total loans, net of allowance for loan losses	0	0
Swaps	1,645	3,211
Deposits:
Noninterest-bearing	0	0
Interest-bearing	2,643,627	2,697,781
Borrowings	486,924	553,416
Junior subordinated debentures	0	0
Swaps	1,645	3,211
Estimated Fair Value [Member] \| Level 3 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	0	0
FHLB stock	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Total loans, net of allowance for loan losses	4,555,459	4,678,402
Swaps	0	0
Deposits:
Noninterest-bearing	0	0
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	19,909	18,070
Swaps	$ 0	$ 0

Business Segments - Additional Information (Detail)	3 Months Ended
Business Segments - Additional Information (Detail)	Mar. 31, 2018 Location Segment
Segment Reporting [Abstract]
Number of principal reporting segments \| Segment	2
Bank operated banking centers, number \| Location	51

Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 70,521	$ 65,433
(Recapture of) provision for loan losses	(1,000)	(4,500)
Net interest income after (recapture of) provision for loan losses	71,521	69,933
Noninterest income	12,916	8,722
Noninterest expense	35,946	34,117
Earnings before income taxes	48,491	44,538
Goodwill	116,564	119,193	$ 116,564
Segment assets	8,356,160	8,559,121	$ 8,270,586
Operating Segments [Member] \| Centers [Member]
Segment Reporting Information [Line Items]
Net interest income	49,583	45,578
(Recapture of) provision for loan losses	329	511
Net interest income after (recapture of) provision for loan losses	49,254	45,067
Noninterest income	5,301	5,207
Noninterest expense	13,225	12,438
Earnings before income taxes	41,330	37,836
Goodwill	116,564	119,193
Segment assets	7,231,624	7,399,909
Operating Segments [Member] \| Dairy & Livestock and Agribusiness [Member]
Segment Reporting Information [Line Items]
Net interest income	3,851	2,144
(Recapture of) provision for loan losses	19	(2,699)
Net interest income after (recapture of) provision for loan losses	3,832	4,843
Noninterest income	45	55
Noninterest expense	517	501
Earnings before income taxes	3,360	4,397
Goodwill	0	0
Segment assets	407,527	363,029
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Net interest income	17,087	17,711
(Recapture of) provision for loan losses	(1,348)	(2,312)
Net interest income after (recapture of) provision for loan losses	18,435	20,023
Noninterest income	7,570	3,460
Noninterest expense	22,204	21,178
Earnings before income taxes	3,801	2,305
Goodwill	0	0
Segment assets	$ 717,009	$ 796,183

Derivative Financial Instruments - Additional Information (Detail)	Mar. 31, 2018 USD ($) Agreement	Dec. 31, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets and liabilities offset in balance sheet	$ 0
Total notional amount of the Company's swaps	$ 191,400,000	$ 198,500,000
Interest-rate Swap Agreements with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest-rate swap agreements \| Agreement	77

Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,645	$ 3,211
Other Assets [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,645	3,211
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	1,645	3,211
Other Liabilities [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1,645	$ 3,211

Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 116	$ 323
Interest Rate Swaps [Member] \| Other Income [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 116	$ 323

Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (31,338)	$ 1,207
Net change in fair value recorded in accumulated OCI, Tax effect	(9,265)	507
Net change in fair value recorded in accumulated OCI, After-tax	(22,073)	700
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Before-tax	(832)	(783)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Tax effect	(246)	(329)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, After-tax	(586)	(454)
Net change, Before-tax	(32,170)	424
Net change, Tax effect	(9,511)	178
Other comprehensive (loss) income, net of tax	$ (22,659)	$ 246

Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 492,291	$ 558,268
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(3,369)	(1,284)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	488,922	556,984
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	3,369	1,284
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(638,939)	(586,519)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(146,648)	(28,251)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	487,277	553,773
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	487,277	553,773
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	0
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(626,413)	(573,759)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(139,136)	(19,986)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	1,645	3,211
Financial assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	1,645	3,211
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	1,645	3,211
Interest Rate Swaps [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	1,645	3,211
Financial assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	1,645	3,211
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	1,645	3,211
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	5,014	4,495
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(3,369)	(1,284)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	1,645	3,211
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	3,369	1,284
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(12,526)	(12,760)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (7,512)	$ (8,265)

Revenue Recognition - Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606 (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Noninterest income:
Service charges on deposit accounts	$ 4,045	$ 3,727
Trust and investment services	2,157	2,296
Bankcard services	804	765
Other	1,391	1,219
Total noninterest income	12,916	8,722
Accounting Standards Update 2014-09 [Member]
Noninterest income:
Service charges on deposit accounts	4,045	3,727
Trust and investment services	2,157	2,296
Bankcard services	804	765
Other	1,391	1,219
Total noninterest income	8,397	8,007
Accounting Standards Update 2014-09 Not Adopted [Member]
Noninterest income:
Total noninterest income	$ 4,519	$ 715

Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 Contract	Mar. 31, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract	0	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 5,209
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		5,209
Troubled debt restructurings, Outstanding Recorded Investment		3,301
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial and Industrial [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial and Industrial [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Small Business Administration [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Small Business Administration [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial Real Estate Owner Occupied [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial Real Estate Owner Occupied [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		3,143
Troubled debt restructurings, Outstanding Recorded Investment		3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial Real Estate Non-owner Occupied [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Commercial Real Estate Non-owner Occupied [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Dairy & Livestock and Agribusiness [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Dairy & Livestock and Agribusiness [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 1,984
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		1,984
Troubled debt restructurings, Outstanding Recorded Investment		78
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Consumer [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0
Troubled debt restructurings, Outstanding Recorded Investment		0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0
Consumer [Member] \| Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans \| Contract		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		82
Troubled debt restructurings, Outstanding Recorded Investment		80
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0