CVB Financial (CVBF) 10-Q 9 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	CVBF
Entity Registrant Name	CVB FINANCIAL CORP
Entity Central Index Key	354,647
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		110,156,656

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 137,196	$ 119,445
Interest-earning balances due from Federal Reserve	6,594	2,188
Total cash and cash equivalents	143,790	121,633
Interest-earning balances due from depository institutions	20,521	47,848
Investment securities available-for-sale, at fair value (with amortized cost of $2,155,330 at September 30, 2017, and $2,255,874 at December 31, 2016)	2,175,648	2,270,466
Investment securities held-to-maturity (with fair value of $842,050 at September 30, 2017, and $897,374 at December 31, 2016)	848,382	911,676
Total investment securities	3,024,030	3,182,142
Investment in stock of Federal Home Loan Bank (FHLB)	17,688	17,688
Loans and lease finance receivables	4,746,424	4,395,064
Allowance for loan losses	(60,631)	(61,540)
Net loans and lease finance receivables	4,685,793	4,333,524
Premises and equipment, net	46,654	42,086
Bank owned life insurance (BOLI)	145,970	134,785
Accrued interest receivable	21,518	22,259
Intangibles	7,177	5,010
Goodwill	116,564	89,533
Other real estate owned (OREO)	4,527	4,527
Income taxes	48,145	45,429
Asset held-for-sale	0	3,411
Other assets	21,635	23,832
Total assets	8,304,012	8,073,707
Deposits:
Noninterest-bearing	3,908,809	3,673,541
Interest-bearing	2,699,287	2,636,139
Total deposits	6,608,096	6,309,680
Customer repurchase agreements	455,069	603,028
Other borrowings	63,000	53,000
Deferred compensation	18,024	12,361
Junior subordinated debentures	25,774	25,774
Payable for securities purchased	1,625	23,777
Other liabilities	55,960	55,225
Total liabilities	7,227,548	7,082,845
Commitments and Contingencies
Stockholders' Equity
Common stock, authorized, 225,000,000 shares without par; issued and outstanding 110,157,384 at September 30, 2017, and 108,251,981 at December 31, 2016	572,685	531,192
Retained earnings	491,935	449,499
Accumulated other comprehensive income, net of tax	11,844	10,171
Total stockholders' equity	1,076,464	990,862
Total liabilities and stockholders' equity	$ 8,304,012	$ 8,073,707

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Amortized cost	$ 2,155,330	$ 2,255,874
Fair Value, Held-to-maturity	$ 842,050	$ 897,374
Common stock, par value
Common stock, authorized	225,000,000	225,000,000
Common stock, shares issued	110,157,384	108,251,981
Common stock, shares outstanding	110,157,384	108,251,981

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans and leases, including fees	$ 55,998	$ 47,754	$ 158,253	$ 143,781
Investment securities:
Investment securities available-for-sale	12,240	11,425	37,887	36,242
Investment securities held-to-maturity	5,184	4,787	16,014	14,878
Total investment income	17,424	16,212	53,901	51,120
Dividends from FHLB stock	318	403	1,070	1,210
Interest-earning deposits with other institutions and federal funds sold	130	802	683	1,575
Total interest income	73,870	65,171	213,907	197,686
Interest expense:
Deposits	1,555	1,525	4,547	4,544
Borrowings and customer repurchase agreements	402	349	1,213	1,117
Junior subordinated debentures	174	136	492	392
Total interest expense	2,131	2,010	6,252	6,053
Net interest income before recapture of provision for loan losses	71,739	63,161	207,655	191,633
Recapture of provision for loan losses	(1,500)	(2,000)	(7,000)	(2,000)
Net interest income after recapture of provision for loan losses	73,239	65,161	214,655	193,633
Noninterest income:
Service charges on deposit accounts	4,085	3,817	11,794	11,386
Trust and investment services	2,523	2,328	7,432	7,039
Bankcard services	927	827	2,563	2,166
BOLI income	692	706	2,904	2,005
Gain on sale of loans	0	0	0	1,101
Other	1,811	1,505	4,843	3,443
Total noninterest income	10,038	9,183	29,536	27,140
Noninterest expense:
Salaries and employee benefits	21,835	20,403	65,116	63,004
Occupancy and equipment	4,400	4,102	12,638	11,940
Professional services	1,091	1,404	4,191	3,727
Software licenses and maintenance	1,510	1,358	4,698	4,077
Marketing and promotion	1,055	1,199	3,484	3,818
Acquisition related expenses	250	353	2,176	1,557
Other	4,565	4,187	13,393	13,685
Total noninterest expense	34,706	33,006	105,696	101,808
Earnings before income taxes	48,571	41,338	138,495	118,965
Income taxes	18,888	15,890	51,935	44,612
Net earnings	29,683	25,448	86,560	74,353
Other comprehensive income (loss):
Unrealized gain (loss) on securities arising during the period, before tax	1,221	(3,709)	3,287	31,054
Less: Reclassification adjustment for net (gain) loss on securities included in net income	0	(548)	(402)	(548)
Other comprehensive income (loss), before tax	1,221	(4,257)	2,885	30,506
Less: Income tax (expense) benefit related to items of other comprehensive income	(513)	1,788	(1,212)	(12,812)
Other comprehensive income (loss), net of tax	708	(2,469)	1,673	17,694
Comprehensive income	$ 30,391	$ 22,979	$ 88,233	$ 92,047
Basic earnings per common share	$ 0.27	$ 0.23	$ 0.79	$ 0.69
Diluted earnings per common share	0.27	0.23	0.79	0.69
Cash dividends declared per common share	$ 0.14	$ 0.12	$ 0.40	$ 0.36

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	County Commerce Bank [Member]	Valley Commerce Bancorp [Member]	Common Stock [Member]	Common Stock [Member]County Commerce Bank [Member]	Common Stock [Member]Valley Commerce Bancorp [Member]	Retained Earnings [Member]	Retained Earnings [Member]County Commerce Bank [Member]	Retained Earnings [Member]Valley Commerce Bancorp [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member]County Commerce Bank [Member]	Accumulated Other Comprehensive Income [Member]Valley Commerce Bancorp [Member]
Beginning balance at Dec. 31, 2015	$ 923,399			$ 502,571			$ 399,919			$ 20,909
Beginning balance, shares at Dec. 31, 2015				106,385
Repurchase of common stock	(496)			$ (496)			0			0
Repurchase of common stock, shares				(66)
Issuance of common stock for acquisition		$ 21,642			$ 21,642			$ 0			$ 0
Issuance of common stock for acquisition, shares					1,394
Exercise of stock options	3,174			$ 3,174			0			0
Exercise of stock options, shares				274
Tax benefit from exercise of stock options	236			$ 236			0			0
Shares issued pursuant to stock-based compensation plan	2,154			$ 2,154			0			0
Shares issued pursuant to stock-based compensation plan, shares				110
Cash dividends declared on common stock	(38,853)			$ 0			(38,853)			0
Net earnings	74,353			0			74,353			0
Other comprehensive income	17,694			0			0			17,694
Ending balance at Sep. 30, 2016	1,003,303			$ 529,281			435,419			38,603
Ending balance, shares at Sep. 30, 2016				108,097
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	(997)			$ (997)			0			0
Repurchase of common stock, shares				(45)
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	2,537			$ 2,537			0			0
Exercise of stock options, shares				270
Shares issued pursuant to stock-based compensation plan	2,200			$ 2,200			0			0
Shares issued pursuant to stock-based compensation plan, shares				46
Cash dividends declared on common stock	(44,058)			$ 0			(44,058)			0
Net earnings	86,560			0			86,560			0
Other comprehensive income	1,673			0			0			1,673
Ending balance at Sep. 30, 2017	$ 1,076,464			$ 572,685			$ 491,935			$ 11,844
Ending balance, shares at Sep. 30, 2017				110,157

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends per common share	$ 0.14	$ 0.12	$ 0.40	$ 0.36

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Interest and dividends received	$ 223,172	$ 208,995
Service charges and other fees received	26,769	23,185
Interest paid	(6,279)	(6,089)
Net cash paid to vendors, employees and others	(82,411)	(95,870)
Income taxes	(53,278)	(31,495)
Payments to FDIC, loss share agreement	(498)	(510)
Net cash provided by operating activities	107,475	98,216
Cash Flows from Investing Activities
Proceeds from redemption of FHLB stock	1,952	1,423
Net change in interest-earning balances from depository institutions	27,806	11,849
Proceeds from sale of investment securities held-for-sale	5,403	1,957
Proceeds from repayment of investment securities available-for-sale	320,599	325,912
Proceeds from maturity of investment securities available-for-sale	20,937	81,209
Purchases of investment securities available-for-sale	(280,365)	(208,563)
Proceeds from repayment and maturity of investment securities held-to-maturity	96,447	231,355
Purchases of investment securities held-to-maturity	(36,166)	(261,457)
Net increase in loan and lease finance receivables	(29,713)	(109,046)
Proceeds from sale of loans	0	6,417
Proceeds from sale of asset held-for-sale	4,012	0
Purchase of premises and equipment	(3,129)	(2,343)
Proceeds from sales of other real estate owned	0	1,846
Cash used in sale of branch, net	0	(8,217)
Cash acquired from acquisition, net of cash paid	28,325	(7,504)
Net cash provided by investing activities	156,108	64,838
Cash Flows from Financing Activities
Net (decrease) increase in other deposits	(23,896)	508,916
Net decrease in time deposits	(39,485)	(319,877)
Repayment of FHLB advances	0	(5,000)
Net increase (decrease) in other borrowings	10,000	(46,000)
Net decrease in customer repurchase agreements	(147,959)	(112,293)
Cash dividends on common stock	(41,626)	(38,652)
Repurchase of common stock	(997)	(496)
Proceeds from exercise of stock options	2,537	3,174
Tax benefit related to exercise of stock options	0	236
Net cash used in financing activities	(241,426)	(9,992)
Net increase in cash and cash equivalents	22,157	153,062
Cash and cash equivalents, beginning of period	121,633	106,097
Cash and cash equivalents, end of period	143,790	259,159
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities
Net earnings	86,560	74,353
Adjustments to reconcile net earnings to net cash provided by operating activities:
Gain on sale of loans	0	(1,101)
Gain on sale of branch	0	(272)
Gain on sale of investment securities	(402)	(548)
Gain on sale of other real estate owned	0	(30)
Increase in bank owned life insurance	(1,763)	(3,117)
Net amortization of premiums and discounts on investment securities	13,585	15,422
Accretion of PCI discount	(756)	(2,112)
Recapture of provision for loan losses	(7,000)	(2,000)
Valuation adjustment on other real estate owned	0	337
Payments to FDIC, loss share agreement	(498)	(510)
Stock-based compensation	2,200	2,154
Depreciation and amortization, net	(433)	3,128
Change in other assets and liabilities	15,982	12,512
Total adjustments	20,915	23,863
Net cash provided by operating activities	107,475	98,216
Supplemental Disclosure of Non-cash Investing Activities
Securities purchased and not settled	1,625	43,111
Issuance of common stock for acquisition	$ 37,637	$ 21,642

Business

Business	9 Months Ended
	Sep. 30, 2017
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 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 On March 10, 2017, we completed the acquisition of Valley Commerce Bancorp (“VCBP”), the holding company for Valley Business Bank (“VBB”), headquartered in the Central Valley area of California with four branch locations and total assets of approximately $400 million. This acquisition strengthens our market share in the Central Valley area of California. Our condensed consolidated financial statements for 2017 include VBB operations, post-merger. See Note 4 – Business Combinations, included herein.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
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 10-K Reclassification

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
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, 10-K 10-K”). Use of Estimates in the Preparation of Financial Statements Adoption of New Accounting Standard No. 2016-09, tax-withholding 2016-09 paid-in Recent Accounting Pronouncements No. 2014-09, No. 2015-14, No. 2014-09 In February 2016, FASB issued ASU No. 2016-02, 2016-02 In June 2016, the FASB issued ASU No. 2016-13, off-balance held-to-maturity available-for-sale No. 2016-13 In August 2016, the FASB issued ASU No. 2016-15, zero-coupon In January 2017, the FASB issued ASU No. 2017-04, 2017-04 In March 2017, the FASB issued ASU No. 2017-08, 310-20): 2017-08 No. 2017-08 In May 2017, the FASB issued ASU No. 2017-09, 2017-09 No. 2017-09 In August 2017, the FASB issued ASU No. 2017-12, 2017-12 non-financial No. 2017-12

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Business Combinations	4. BUSINESS COMBINATIONS Valley Commerce Bancorp Acquisition On March 10, 2017, the Company completed the acquisition of VCBP, the holding company for 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 into nearby CBB locations in the third quarter of 2017. The Company has entered into an agreement to sell the Woodlake branch, which is expected to close 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 Bank-Owned Life Insurance (“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 and nine months ended September 30, 2017, the Company incurred non-recurring County Commerce Bank Acquisition On February 29, 2016, the Bank acquired all of the assets and assumed all of the liabilities of County Commerce Bank (“CCB”) for $20.6 million in cash and $21.6 million in stock. As a result, CCB was merged with the Bank, the principal subsidiary of CVB. The Company believes this transaction served to further expand its footprint northward into and along the central coast of California. At close, CCB had four branches located in Ventura, Oxnard, Camarillo, and Westlake Village. Goodwill of $15.3 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 $252.4 million, which included $54.8 million in cash and balances due from depository institutions net of cash paid, $1.5 million in FHLB stock, $168.0 million in loans and lease finance receivables, $8.6 million in fixed assets, $3.9 million in core deposit intangible assets acquired and $289,000 in other assets. The total fair value of liabilities assumed was $230.8 million, which included $224.2 million in deposits, $5.0 million in FHLB advances and $1.6 million in other liabilities. The assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of February 29, 2016. The assets acquired and liabilities assumed have been accounted for under the acquisition method accounting. The purchase price allocation was finalized in the fourth quarter of 2016. 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 and nine months ended September 30, 2016, the Company incurred non-recurring

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
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. September 30, 2017 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 1,799,972 $ 22,164 $ (4,102 ) $ 1,818,034 83.57 % CMO/REMIC - residential 291,984 2,665 (867 ) 293,782 13.50 % Municipal bonds 62,657 726 (268 ) 63,115 2.90 % Other securities 717 - - 717 0.03 % Total available-for-sale $ 2,155,330 $ 25,555 $ (5,237 ) $ 2,175,648 100.00 % Investment securities held-to-maturity: Government agency/GSE $ 164,886 $ 1,532 $ (1,489 ) $ 164,929 19.44 % Residential mortgage-backed securities 178,246 880 (61 ) 179,065 21.01 % CMO 229,885 - (6,865 ) 223,020 27.09 % Municipal bonds 275,365 2,800 (3,129 ) 275,036 32.46 % Total held-to-maturity $ 848,382 $ 5,212 $ (11,544 ) $ 842,050 100.00 % December 31, 2016 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSE $ 2,750 $ 2 $ - $ 2,752 0.12 % Residential mortgage-backed securities 1,822,168 18,812 (6,232 ) 1,834,748 80.81 % CMO/REMIC - residential 345,313 3,361 (1,485 ) 347,189 15.29 % Municipal bonds 80,137 889 (955 ) 80,071 3.53 % Other securities 5,506 200 - 5,706 0.25 % Total available-for-sale $ 2,255,874 $ 23,264 $ (8,672 ) $ 2,270,466 100.00 % Investment securities held-to-maturity: Government agency/GSE $ 182,648 $ 362 $ (1,972 ) $ 181,038 20.03 % Residential mortgage-backed securities 193,699 - (1,892 ) 191,807 21.25 % CMO 244,419 - (6,808 ) 237,611 26.81 % Municipal bonds 290,910 776 (4,768 ) 286,918 31.91 % Total held-to-maturity $ 911,676 $ 1,138 $ (15,440 ) $ 897,374 100.00 % 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 For the Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (Dollars in thousands) Investment securities available-for-sale: Taxable $ 11,767 $ 10,546 $ 36,113 $ 32,754 Tax-advantaged 473 879 1,774 3,488 Total interest income from available-for-sale 12,240 11,425 37,887 36,242 Investment securities held-to-maturity: Taxable 3,111 2,349 9,591 7,184 Tax-advantaged 2,073 2,438 6,423 7,694 Total interest income from held-to-maturity 5,184 4,787 16,014 14,878 Total interest income from investment securities $ 17,424 $ 16,212 $ 53,901 $ 51,120 Approximately 89% of the total investment securities portfolio at September 30, 2017 represents securities issued by the U.S government or U.S. government-sponsored enterprises, with the implied guarantee of payment of principal and interest. All non-agency available-for-sale 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 September 30, 2017 and December 31, 2016. 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”). September 30, 2017 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Fair Value Gross Fair Value Gross (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 352,129 $ (4,102 ) $ - $ - $ 352,129 $ (4,102 ) CMO/REMIC - residential 42,017 (463 ) 33,454 (404 ) 75,471 (867 ) Municipal bonds 15,008 (267 ) 5,996 (1 ) 21,004 (268 ) Total available-for-sale $ 409,154 $ (4,832 ) $ 39,450 $ (405 ) $ 448,604 $ (5,237 ) Investment securities held-to-maturity: Government agency/GSE $ 39,929 $ (1,305 ) $ 5,411 $ (184 ) $ 45,340 $ (1,489 ) Residential mortgage-backed securities 62,677 (61 ) - - 62,677 (61 ) CMO 173,752 (5,200 ) 49,268 (1,665 ) 223,020 (6,865 ) Municipal bonds 66,912 (1,676 ) 32,921 (1,453 ) 99,833 (3,129 ) Total held-to-maturity $ 343,270 $ (8,242 ) $ 87,600 $ (3,302 ) $ 430,870 $ (11,544 ) December 31, 2016 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Fair Value Gross Fair Value Gross (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 583,143 $ (6,232 ) $ - $ - $ 583,143 $ (6,232 ) CMO/REMIC - residential 128,595 (1,485 ) - - 128,595 (1,485 ) Municipal bonds 23,255 (954 ) 5,981 (1 ) 29,236 (955 ) Total available-for-sale $ 734,993 $ (8,671 ) $ 5,981 $ (1 ) $ 740,974 $ (8,672 ) Investment securities held-to-maturity: Government agency/GSE $ 76,854 $ (1,972 ) $ - $ - $ 76,854 $ (1,972 ) Residential mortgage-backed securities 191,807 (1,892 ) - - 191,807 (1,892 ) CMO 237,611 (6,808 ) - - 237,611 (6,808 ) Municipal bonds 145,804 (3,711 ) 36,971 (1,057 ) 182,775 (4,768 ) Total held-to-maturity $ 652,076 $ (14,383 ) $ 36,971 $ (1,057 ) $ 689,047 $ (15,440 ) At September 30, 2017 and December 31, 2016, investment securities having a carrying value of approximately $1.88 billion and $2.19 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 September 30, 2017, 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. September 30, 2017 Available-for-sale Held-to-maturity Amortized Fair Value Amortized Fair Value (Dollars in thousands) Due in one year or less $ 18,711 $ 18,895 $ 885 $ 887 Due after one year through five years 1,985,884 2,005,750 251,948 249,473 Due after five years through ten years 116,933 116,800 237,282 235,069 Due after ten years 33,802 34,203 358,267 356,621 Total investment securities $ 2,155,330 $ 2,175,648 $ 848,382 $ 842,050 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 September 30, 2017.

Acquired SJB Assets and FDIC Lo

Acquired SJB Assets and FDIC Loss Sharing Asset	9 Months Ended
	Sep. 30, 2017
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 10-K At September 30, 2017, the remaining discount associated with the PCI loans approximated $758,000. 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. September 30, 2017 December 31, 2016 (Dollars in thousands) Commercial and industrial $ 1,002 $ 2,309 SBA 1,410 327 Real estate: Commercial real estate 33,799 67,594 Construction - - SFR mortgage 166 178 Dairy & livestock and agribusiness 335 1,216 Municipal lease finance receivables - - Consumer and other loans 594 1,469 Gross PCI loans 37,306 73,093 Less: Purchase accounting discount (758 ) (1,508 ) Gross PCI loans, net of discount 36,548 71,585 Less: Allowance for PCI loan losses (431 ) (1,219 ) Net PCI loans $ 36,117 $ 70,366 Credit Quality Indicators The following table summarizes gross PCI loans by internal risk ratings for the periods indicated. September 30, 2017 December 31, 2016 (Dollars in thousands) Pass $ 32,309 $ 59,409 Special mention 147 1,162 Substandard 4,850 12,522 Doubtful & loss - - Total gross PCI loans $ 37,306 $ 73,093

Loans and Lease Finance Receiva

Loans and Lease Finance Receivables and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
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 total loans and lease finance receivables, excluding PCI loans, by type. September 30, 2017 December 31, 2016 (Dollars in thousands) Commercial and industrial $ 528,659 $ 485,078 SBA 124,091 97,184 Real estate: Commercial real estate 3,332,517 2,930,141 Construction 74,148 85,879 SFR mortgage 244,662 250,605 Dairy & livestock and agribusiness 270,482 338,631 Municipal lease finance receivables 71,352 64,639 Consumer and other loans 70,415 78,274 Gross loans, excluding PCI loans 4,716,326 4,330,431 Less: Deferred loan fees, net (6,450 ) (6,952 ) Gross loans, excluding PCI loans, net of deferred loan fees 4,709,876 4,323,479 Less: Allowance for loan losses (60,200 ) (60,321 ) Net loans, excluding PCI loans 4,649,676 4,263,158 PCI Loans 37,306 73,093 Discount on PCI loans (758 ) (1,508 ) Less: Allowance for loan losses (431 ) (1,219 ) PCI loans, net 36,117 70,366 Total loans and lease finance receivables $ 4,685,793 $ 4,333,524 As of September 30, 2017, 77.42% of the total gross loan portfolio (excluding PCI loans) consisted of real estate loans, 70.66% 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 September 30, 2017, $180.2 million, or 5.41% of the total commercial real estate loans included loans secured by farmland, compared to $180.6 million, or 6.16%, at December 31, 2016. The loans secured by farmland included $102.0 million for loans secured by dairy & livestock land and $78.2 million for loans secured by agricultural land at September 30, 2017, compared to $127.1 million for loans secured by dairy & livestock land and $53.6 million for loans secured by agricultural land at December 31, 2016. As of September 30, 2017, dairy & livestock and agribusiness loans of $270.5 million were comprised of $235.2 million for dairy & livestock loans and $35.3 million for agribusiness loans, compared to $317.9 million for dairy & livestock loans and $20.7 million for agribusiness loans at December 31, 2016. At September 30, 2017, the Company held approximately $2.16 billion of total fixed rate loans, including PCI loans. At September 30, 2017 and December 31, 2016, loans totaling $3.61 billion and $3.11 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 Credit Quality Indicators Central to our 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 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. September 30, 2017 Pass Special Substandard Doubtful & Total (Dollars in thousands) Commercial and industrial $ 485,025 $ 30,675 $ 12,959 $ - $ 528,659 SBA 113,423 4,504 6,164 - 124,091 Real estate: Commercial real estate Owner occupied 960,523 88,507 21,327 - 1,070,357 Non-owner 2,238,827 16,363 6,970 - 2,262,160 Construction Speculative 51,596 2,966 - - 54,562 Non-speculative 19,586 - - - 19,586 SFR mortgage 236,027 4,560 4,075 - 244,662 Dairy & livestock and agribusiness 206,720 46,614 17,148 - 270,482 Municipal lease finance receivables 70,723 629 - - 71,352 Consumer and other loans 67,362 1,457 1,594 2 70,415 Total gross loans, excluding PCI loans $ 4,449,812 $ 196,275 $ 70,237 $ 2 $ 4,716,326 December 31, 2016 Pass Special Substandard Doubtful & Total (Dollars in thousands) Commercial and industrial $ 449,658 $ 21,610 $ 13,809 $ 1 $ 485,078 SBA 80,138 10,553 6,482 11 97,184 Real estate: Commercial real estate Owner occupied 842,992 87,781 19,046 - 949,819 Non-owner 1,941,203 23,534 15,585 - 1,980,322 Construction Speculative 48,841 - - - 48,841 Non-speculative 37,038 - - - 37,038 SFR mortgage 243,374 4,930 2,301 - 250,605 Dairy & livestock and agribusiness 187,819 114,106 36,706 - 338,631 Municipal lease finance receivables 60,102 4,537 - - 64,639 Consumer and other loans 74,328 2,123 1,819 4 78,274 Total gross loans, excluding PCI loans $ 3,965,493 $ 269,174 $ 95,748 $ 16 $ 4,330,431 Allowance for Loan Losses (“ALLL”) The Bank’s Audit and Director Loan Committees provide Board oversight of the ALLL process and approves the ALLL methodology 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 10-K Management believes that the ALLL was appropriate at September 30, 2017 and December 31, 2016. 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 For the Three Months Ended September 30, 2017 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,060 $ (138 ) $ 12 $ 129 $ 8,063 SBA 913 - 5 (54 ) 864 Real estate: Commercial real estate 39,927 - - 943 40,870 Construction 1,059 - 2,055 (2,181 ) 933 SFR mortgage 2,369 - - (49 ) 2,320 Dairy & livestock and agribusiness 5,440 - - (66 ) 5,374 Municipal lease finance receivables 852 - - 54 906 Consumer and other loans 922 (9 ) 5 (48 ) 870 PCI loans 659 - - (228 ) 431 Total allowance for loan losses $ 60,201 $ (147 ) $ 2,077 $ (1,500 ) $ 60,631 For the Three Months Ended September 30, 2016 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 9,387 $ - $ 49 $ 30 $ 9,466 SBA 1,177 - 6 (179 ) 1,004 Real estate: Commercial real estate 39,919 - 156 (1,267 ) 38,808 Construction 1,228 - 1,731 (1,851 ) 1,108 SFR mortgage 2,501 - - 70 2,571 Dairy & livestock and agribusiness 4,882 - - 1,089 5,971 Municipal lease finance receivables 1,115 - - (82 ) 1,033 Consumer and other loans 419 (7 ) 128 (100 ) 440 PCI loans 310 - - 290 600 Total allowance for loan losses $ 60,938 $ (7 ) $ 2,070 $ (2,000 ) $ 61,001 For the Nine Months Ended September 30, 2017 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,154 $ (138 ) $ 106 $ (59 ) $ 8,063 SBA 871 - 47 (54 ) 864 Real estate: Commercial real estate 37,443 - 154 3,273 40,870 Construction 1,096 - 5,774 (5,937 ) 933 SFR mortgage 2,287 - 64 (31 ) 2,320 Dairy & livestock and agribusiness 8,541 - 19 (3,186 ) 5,374 Municipal lease finance receivables 941 - - (35 ) 906 Consumer and other loans 988 (11 ) 76 (183 ) 870 PCI loans 1,219 - - (788 ) 431 Total allowance for loan losses $ 61,540 $ (149 ) $ 6,240 $ (7,000 ) $ 60,631 For the Nine Months Ended September 30, 2016 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,588 $ (85 ) $ 253 $ 710 $ 9,466 SBA 993 - 9 2 1,004 Real estate: Commercial real estate 36,995 - 791 1,022 38,808 Construction 2,389 - 2,615 (3,896 ) 1,108 SFR mortgage 2,103 (102 ) - 570 2,571 Dairy & livestock and agribusiness 6,029 - 206 (264 ) 5,971 Municipal lease finance receivables 1,153 - - (120 ) 1,033 Consumer and other loans 906 (8 ) 166 (624 ) 440 PCI loans - - - 600 600 Total allowance for loan losses $ 59,156 $ (195 ) $ 4,040 $ (2,000 ) $ 61,001 The following tables present the recorded investment in loans held-for-investment September 30, 2017 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Acquired with Individually Collectively Acquired with (Dollars in thousands) Commercial and industrial $ 745 $ 527,914 $ - $ 2 $ 8,061 $ - SBA 2,273 121,818 - 3 861 - Real estate: Commercial real estate 8,168 3,324,349 - - 40,870 - Construction - 74,148 - - 933 - SFR mortgage 4,550 240,112 - - 2,320 - Dairy & livestock and agribusiness 829 269,653 - - 5,374 - Municipal lease finance receivables - 71,352 - - 906 - Consumer and other loans 743 69,672 - 83 787 - PCI loans - - 36,548 - - 431 Total $ 17,308 $ 4,699,018 $ 36,548 $ 88 $ 60,112 $ 431 September 30, 2016 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Acquired with Individually Collectively Acquired with (Dollars in thousands) Commercial and industrial $ 1,349 $ 493,134 $ - $ 493 $ 8,973 $ - SBA 3,867 100,176 - 33 971 - Real estate: Commercial real estate 15,806 2,895,959 - - 38,808 - Construction 7,651 83,059 - 4 1,104 - SFR mortgage 5,502 235,988 - 6 2,565 - Dairy & livestock and agribusiness 659 238,583 - - 5,971 - Municipal lease finance receivables - 68,309 - - 1,033 - Consumer and other loans 850 78,814 - 12 428 - PCI loans - - 73,035 - - 600 Total $ 35,684 $ 4,194,022 $ 73,035 $ 548 $ 59,853 $ 600 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 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 these concessions, restructured loans are classified as impaired. Impairment reserves on non-collateral 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. September 30, 2017 30-59 Days 60-89 Days Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ 45 $ - $ 45 $ 313 $ 528,301 $ 528,659 SBA - - - 1,611 122,480 124,091 Real estate: Commercial real estate Owner occupied 220 - 220 4,184 1,065,953 1,070,357 Non-owner - - - 2,544 2,259,616 2,262,160 Construction Speculative (2) - - - - 54,562 54,562 Non-speculative - - - - 19,586 19,586 SFR mortgage - - - 1,349 243,313 244,662 Dairy & livestock and agribusiness - - - 829 269,653 270,482 Municipal lease finance receivables - - - - 71,352 71,352 Consumer and other loans 6 - 6 743 69,666 70,415 Total gross loans, excluding PCI Loans $ 271 $ - $ 271 $ 11,573 $ 4,704,482 $ 4,716,326 (1) As of September 30, 2017, $4.5 million of nonaccruing loans were current, $1.4 million were 30-59 60-89 (2) Speculative construction loans are generally for properties where there is no identified buyer or renter. December 31, 2016 30-59 Days 60-89 Days Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ - $ - $ - $ 156 $ 484,922 $ 485,078 SBA 352 - 352 2,737 94,095 97,184 Real estate: Commercial real estate Owner occupied - - - 635 949,184 949,819 Non-owner - - - 1,048 1,979,274 1,980,322 Construction Speculative (2) - - - - 48,841 48,841 Non-speculative - - - - 37,038 37,038 SFR mortgage - - - 2,207 248,398 250,605 Dairy & livestock and agribusiness - - - - 338,631 338,631 Municipal lease finance receivables - - - - 64,639 64,639 Consumer and other loans 84 - 84 369 77,821 78,274 Total gross loans, excluding PCI Loans $ 436 $ - $ 436 $ 7,152 $ 4,322,843 $ 4,330,431 (1) As of December 31, 2016, $4.7 million of nonaccruing loans were current, $514,000 were 30-59 60-89 (2) Speculative construction loans are generally for properties where there is no identified buyer or renter. Impaired Loans At September 30, 2017, the Company had impaired loans, excluding PCI loans, of $17.3 million and included $4.5 million of loans acquired from VBB in the first quarter of 2017. Impaired loans included $6.7 million of nonaccrual commercial real estate loans, $1.6 million of nonaccrual Small Business Administration (“SBA”) loans, $1.3 million of nonaccrual single-family residential (“SFR”) mortgage loans, $829,000 of nonaccrual dairy & livestock and agribusiness loans, $743,000 of nonaccrual consumer and other loans, and $313,000 of nonaccrual commercial and industrial loans. These impaired loans included $10.0 million of loans whose terms were modified in a troubled debt restructuring, of which $4.3 million were classified as nonaccrual. The remaining balance of $5.7 million consisted of 21 loans performing according to the restructured terms. The impaired loans had a specific allowance of $88,000 at September 30, 2017. At December 31, 2016, the Company had classified as impaired, loans, excluding PCI loans, with a balance of $26.4 million with a related allowance of $141,000. The following tables present information for held-for-investment As of and For the Nine Months Ended Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 726 $ 1,256 $ - $ 870 $ 15 SBA 2,270 2,573 - 2,489 38 Real estate: Commercial real estate Owner occupied 4,313 4,625 - 4,361 42 Non-owner 3,855 5,155 - 4,010 72 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 4,550 5,345 - 4,620 109 Dairy & livestock and agribusiness 829 1,091 - 1,035 1 Municipal lease finance receivables - - - - - Consumer and other loans 356 571 - 381 - Total 16,899 20,616 - 17,766 277 With a related allowance recorded Commercial and industrial 19 20 2 42 1 SBA 3 20 3 7 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner - - - - - Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 387 394 83 390 - Total 409 434 88 439 1 Total impaired loans $ 17,308 $ 21,050 $ 88 $ 18,205 $ 278 As of and For the Nine Months Ended Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 786 $ 1,687 $ - $ 858 $ 20 SBA 3,665 4,452 - 3,770 38 Real estate: Commercial real estate Owner occupied 2,773 3,786 - 3,039 63 Non-owner 13,033 15,764 - 13,386 130 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 5,239 6,118 - 5,370 93 Dairy & livestock and agribusiness 659 722 - 695 24 Municipal lease finance receivables - - - - - Consumer and other loans 838 1,409 - 896 11 Total 26,993 33,938 - 28,014 379 With a related allowance recorded Commercial and industrial 563 625 493 671 8 SBA 202 217 33 209 10 Real estate: Commercial real estate Owner occupied - - - - - Non-owner - - - - - Construction Speculative 7,651 7,651 4 7,651 291 Non-speculative - - - - - SFR mortgage 263 263 6 273 4 Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 12 12 12 12 - Total 8,691 8,768 548 8,816 313 Total impaired loans $ 35,684 $ 42,706 $ 548 $ 36,830 $ 692 As of December 31, 2016 Recorded Unpaid Related (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 730 $ 1,646 $ - SBA 3,386 4,189 - Real estate: Commercial real estate Owner occupied 1,797 2,276 - Non-owner 13,331 15,842 - Construction Speculative - - - Non-speculative - - - SFR mortgage 5,174 6,075 - Dairy & livestock and agribusiness 747 747 - Municipal lease finance receivables - - - Consumer and other loans 853 1,423 - Total 26,018 32,198 - With a related allowance recorded Commercial and industrial 171 171 114 SBA 196 212 27 Real estate: Commercial real estate Owner occupied - - - Non-owner - - - Construction Speculative - - - Non-speculative - - - SFR mortgage - - - Dairy & livestock and agribusiness - - - Municipal lease finance receivables - - - Consumer and other loans - - - Total 367 383 141 Total impaired loans $ 26,385 $ 32,581 $ 141 The Company recognizes the charge-off charge-off non-collateral Reserve for Unfunded Loan Commitments The allowance for off-balance off-balance Troubled Debt Restructurings (“TDRs”) Loans that are reported as TDRs are considered impaired and charge-off Summary of Significant Accounting Policies 10-K As of September 30, 2017, there were $10.0 million of loans classified as a TDR, of which $4.3 million were nonperforming and $5.7 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 September 30, 2017, performing TDRs were comprised of three commercial real estate loans of $1.4 million, 11 SFR mortgage loans of $3.2 million, two SBA loans of $662,000, and five commercial and industrial loans of $432,000. 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 $5,000 and $141,000 of specific allowance to TDRs as of September 30, 2017 and December 31, 2016, respectively. The following table provides a summary of the activity related to TDRs for the periods presented. For the Three Months Ended For the Nine Months Ended 2017 2016 2017 2016 (Dollars in thousands) Performing TDRs: Beginning balance $ 16,574 $ 20,292 $ 19,233 $ 42,687 New modifications - 759 3,143 1,877 Payoffs/payments, net and other (10,839 ) (2,584 ) (13,826 ) (26,097 ) TDRs returned to accrual status - 8,551 329 8,551 TDRs placed on nonaccrual status - - (3,144 ) - Ending balance $ 5,735 $ 27,018 $ 5,735 $ 27,018 Nonperforming TDRs: Beginning balance $ 4,391 $ 12,029 $ 1,626 $ 12,622 New modifications - 20 2,066 102 Charge-offs - - - (38 ) Payoffs/payments, net and other (81 ) (465 ) (2,197 ) (1,102 ) TDRs returned to accrual status - (8,551 ) (329 ) (8,551 ) TDRs placed on nonaccrual status - - 3,144 - Ending balance $ 4,310 $ 3,033 $ 4,310 $ 3,033 Total TDRs $ 10,045 $ 30,051 $ 10,045 $ 30,051 There were no loans that were modified as TDRs during the three months ended September 30, 2017. The following tables summarize loans modified as troubled debt restructurings for the periods presented. Modifications (1) For the Three Months Ended September 30, 2016 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (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 1 20 20 14 - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner Interest rate reduction - - - - - Change in amortization period or maturity 1 759 759 759 - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Total loans 2 $ 779 $ 779 $ 773 $ - For the Nine Months Ended September 30, 2017 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (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 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 76 - Total loans 3 $ 5,209 $ 5,209 $ 3,297 $ - For the Nine Months Ended September 30, 2016 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity 1 112 112 184 - SBA: Interest rate reduction - - - - - Change in amortization period or maturity 2 214 214 202 28 Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner Interest rate reduction - - - - - Change in amortization period or maturity 1 759 759 759 - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Change in amortization period or maturity 1 24 24 22 - Total loans 5 $ 1,109 $ 1,109 $ 1,167 $ 28 (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 September 30, 2017, there was one commercial real estate loan with an outstanding balance of $3.1 million and one dairy & livestock and agribusiness loan with an outstanding balance of $78,000 that was modified as a TDR within the previous 12 months that subsequently defaulted during the nine months ended September 30, 2017.

Earnings Per Share Reconciliati

Earnings Per Share Reconciliation	9 Months Ended
	Sep. 30, 2017
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 tax-effected 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 For the Nine Months 2017 2016 2017 2016 (In thousands, except per share amounts) Earnings per common share: Net earnings $ 29,683 $ 25,448 $ 86,560 $ 74,353 Less: Net earnings allocated to restricted stock 107 98 325 305 Net earnings allocated to common shareholders $ 29,576 $ 25,350 $ 86,235 $ 74,048 Weighted average shares outstanding 109,754 108,984 109,280 107,144 Basic earnings per common share $ 0.27 $ 0.23 $ 0.79 $ 0.69 Diluted earnings per common share: Net income allocated to common shareholders $ 29,576 $ 25,350 $ 86,235 $ 74,048 Weighted average shares outstanding 109,754 108,984 109,280 107,144 Incremental shares from assumed exercise of outstanding options 365 386 392 403 Diluted weighted average shares outstanding 110,119 109,370 109,672 107,547 Diluted earnings per common share $ 0.27 $ 0.23 $ 0.79 $ 0.69

Fair Value Information

Fair Value Information	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017. 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 • Level 2 • Level 3 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 nine months ended September 30, 2017 and 2016. 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 Quoted Prices in Significant Other (Level 2) Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSE $ - $ - $ - $ - Residential mortgage-backed securities 1,818,034 - 1,818,034 - CMO/REMIC - residential 293,782 - 293,782 - Municipal bonds 63,115 - 63,115 - Other securities 717 - 717 - Total investment securities - AFS 2,175,648 - 2,175,648 - Interest rate swaps 4,819 - 4,819 - Total assets $ 2,180,467 $ - $ 2,180,467 $ - Description of liability Interest rate swaps $ 4,819 $ - $ 4,819 $ - Total liabilities $ 4,819 $ - $ 4,819 $ - Carrying Value at Quoted Prices in Active Markets for Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSE $ 2,752 $ - $ 2,752 $ - Residential mortgage-backed securities 1,834,748 - 1,834,748 - CMO/REMIC - residential 347,189 - 347,189 - Municipal bonds 80,071 - 80,071 - Other securities 5,706 - 5,706 - Total investment securities - AFS 2,270,466 - 2,270,466 - Interest rate swaps 5,783 - 5,783 - Total assets $ 2,276,249 $ - $ 2,276,249 $ - Description of liability Interest rate swaps $ 5,783 $ - $ 5,783 $ - Total liabilities $ 5,783 $ - $ 5,783 $ - Assets and Liabilities Measured at Fair Value on a Non-Recurring We may be required to measure certain assets at fair value on a non-recurring non-recurring Carrying Value at Quoted Prices in Significant Other Significant Total Losses (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 386 - - 386 83 Other real estate owned - - - - - Asset held-for-sale - - - - - Total assets $ 386 $ - $ - $ 386 $ 83 Carrying Value at Quoted Prices in Significant Other Significant Total Losses (Dollars in thousands) Description of assets Impaired loans, excluding PCI loans: Commercial and industrial $ 65 $ - $ - $ 65 $ 8 SBA 196 - - 196 27 Real estate: Commercial real estate - - - - - Construction - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness - - - - - Consumer and other loans - - - - - Other real estate owned - - - - - Asset held-for-sale 3,411 3,411 2,558 Total assets $ 3,672 $ - $ - $ 3,672 $ 2,593 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 September 30, 2017 and December 31, 2016, respectively. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. September 30, 2017 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 143,790 $ 143,790 $ - $ - $ 143,790 Interest-earning balances due from depository institutions 20,521 - 20,567 - 20,567 FHLB stock 17,688 - 17,688 - 17,688 Investment securities available-for-sale 2,175,648 - 2,175,648 - 2,175,648 Investment securities held-to-maturity 848,382 - 842,050 - 842,050 Total loans, net of allowance for loan losses 4,685,793 - - 4,619,896 4,619,896 Swaps 4,819 - 4,819 - 4,819 Liabilities Deposits: Noninterest-bearing $ 3,908,809 $ 3,908,809 $ - $ - $ 3,908,809 Interest-bearing 2,699,287 - 2,697,349 - 2,697,349 Borrowings 518,069 - 517,827 - 517,827 Junior subordinated debentures 25,774 - - 18,260 18,260 Swaps 4,819 - 4,819 - 4,819 December 31, 2016 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 119,445 $ 119,445 $ - $ - $ 119,445 Interest-earning balances due from depository institutions 2,188 - 2,188 - 2,188 FHLB stock 17,688 - 17,688 - 17,688 Investment securities available-for-sale 2,270,466 - 2,270,466 - 2,270,466 Investment securities held-to-maturity 911,676 - 897,374 - 897,374 Total loans, net of allowance for loan losses 4,333,524 - - 4,306,225 4,306,225 Swaps 5,783 - 5,783 - 5,783 Liabilities Deposits: Noninterest-bearing $ 3,673,541 $ 3,673,541 $ - $ - $ 3,673,541 Interest-bearing 2,636,139 - 2,634,443 - 2,634,443 Borrowings 656,028 - 655,820 - 655,820 Junior subordinated debentures 25,774 - - 18,463 18,463 Swaps 5,783 - 5,783 - 5,783 The fair value estimates presented herein are based on pertinent information available to management as of September 30, 2017 and December 31, 2016. 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.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Business Segments	10. BUSINESS SEGMENTS The Company has identified two principal reportable segments: Business Financial and Commercial 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. In 2016, Dairy & Livestock and Agribusiness was reflected as our second reportable segment. All other operating departments have been aggregated and included in “Other” for reporting purposes. Recapture of provision for loan losses was allocated by segment based on loan type in 2016. Prior period information has been conformed to the current presentation. 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 10-K 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 September 30, 2017 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 50,539 $ 2,728 $ 18,472 $ 71,739 (Recapture of) provision for loan losses 772 (66 ) (2,206 ) (1,500 ) Net interest income after (recapture of) provision for loan losses 49,767 2,794 20,678 73,239 Noninterest income 5,764 84 4,190 10,038 Noninterest expense 12,963 479 21,264 34,706 Segment pre-tax $ 42,568 $ 2,399 $ 3,604 $ 48,571 Goodwill $ 116,564 $ - $ - $ 116,564 Segment assets as of September 30, 2017 $ 7,166,356 $ 377,670 $ 759,986 $ 8,304,012 (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 September 30, 2016 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 45,499 $ 2,008 $ 15,654 $ 63,161 (Recapture of) provision for loan losses (1,164 ) 1,089 (1,925 ) (2,000 ) Net interest income after (recapture of) provision for loan losses 46,663 919 17,579 65,161 Noninterest income 5,182 73 3,928 9,183 Noninterest expense 12,423 474 20,109 33,006 Segment pre-tax $ 39,422 $ 518 $ 1,398 $ 41,338 Goodwill $ 88,174 $ - $ - $ 88,174 Segment assets as of September 30, 2016 $ 6,945,214 $ 376,862 $ 722,917 $ 8,044,993 (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 Nine Months Ended September 30, 2017 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 144,879 $ 7,241 $ 55,535 $ 207,655 (Recapture of) provision for loan losses 2,158 (3,186 ) (5,972 ) (7,000 ) Net interest income after (recapture of) provision for loan losses 142,721 10,427 61,507 214,655 Noninterest income 16,274 188 13,074 29,536 Noninterest expense 38,607 1,484 65,605 105,696 Segment pre-tax $ 120,388 $ 9,131 $ 8,976 $ 138,495 Goodwill $ 116,564 $ - $ - $ 116,564 Segment assets as of September 30, 2017 $ 7,166,356 $ 377,670 $ 759,986 $ 8,304,012 (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 Nine Months Ended September 30, 2016 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 132,316 $ 5,927 $ 53,390 $ 191,633 (Recapture of) provision for loan losses 2,251 (264 ) (3,987 ) (2,000 ) Net interest income after (recapture of) provision for loan losses 130,065 6,191 57,377 193,633 Noninterest income 15,335 180 11,625 27,140 Noninterest expense 37,924 1,452 62,432 101,808 Segment pre-tax $ 107,476 $ 4,919 $ 6,570 $ 118,965 Goodwill $ 88,174 $ - $ - $ 88,174 Segment assets as of September 30, 2016 $ 6,945,214 $ 376,862 $ 722,917 $ 8,044,993 (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 Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017, 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 a swap with its customers to allow them to convert variable rate loans to fixed rate loans, and at the same time, the Bank enters into a swap with the counterparty bank to allow the Bank to pass on the interest-rate risk associated with the customer fixed rate swaps. 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 September 30, 2017 and December 31, 2016, the total notional amount of the Company’s swaps was $199.9 million, and $202.7 million, respectively. The location of the asset and liability, and their respective fair values are summarized in the tables below. September 30, 2017 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 4,819 Other liabilities $ 4,819 Total derivatives $ 4,819 $ 4,819 December 31, 2016 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 5,783 Other liabilities $ 5,783 Total derivatives $ 5,783 $ 5,783 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 For the Nine Months Ended 2017 2016 2017 2016 (Dollars in thousands) Interest rate swaps Other income $ 198 $ 136 $ 592 $ 521 Total $ 198 $ 136 $ 592 $ 521

Other Comprehensive Income

Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 2016 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 $ 2,083 $ 875 $ 1,208 $ (4,006 ) $ (1,683 ) $ (2,323 ) Amortization of unrealized gain (loss) on securities transferred from available-for-sale held-to-maturity (862 ) (362 ) (500 ) 297 125 172 Net realized gain reclassified into earnings (1) - - - (548 ) (230 ) (318 ) Net change $ 1,221 $ 513 $ 708 $ (4,257 ) $ (1,788 ) $ (2,469 ) For the Nine Months Ended September 30, 2017 2016 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 $ 6,128 $ 2,574 $ 3,554 $ 31,617 $ 13,279 $ 18,338 Amortization of unrealized gain on securities transferred from available-for-sale held-to-maturity (2,841 ) (1,193 ) (1,648 ) (563 ) (237 ) (326 ) Net realized gain reclassified into earnings (1) (402 ) (169 ) (233 ) (548 ) (230 ) (318 ) Net change $ 2,885 $ 1,212 $ 1,673 $ 30,506 $ 12,812 $ 17,694 (1) Included in other noninterest income.

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2017
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 Gross Amounts Net Amounts of Gross Amounts Not Offset in the Condensed Consolidated Balance Net Amount Consolidated Consolidated Consolidated Financial Collateral (Dollars in thousands) September 30, 2017 Financial assets: Derivatives not designated as hedging instruments $ 4,819 $ - $ - $ 4,819 $ - $ 4,819 Total $ 4,819 $ - $ - $ 4,819 $ - $ 4,819 Financial liabilities: Derivatives not designated as hedging instruments $ 5,709 $ (890 ) $ 4,819 $ 890 $ (12,778 ) $ (7,069 ) Repurchase agreements 455,069 - 455,069 - (510,351 ) (55,282 ) Total $ 460,778 $ (890 ) $ 459,888 $ 890 $ (523,129 ) $ (62,351 ) December 31, 2016 Financial assets: Derivatives not designated as hedging instruments $ 5,783 $ - $ - $ 5,783 $ - $ 5,783 Total $ 5,783 $ - $ - $ 5,783 $ - $ 5,783 Financial liabilities: Derivatives not designated as hedging instruments $ 6,855 $ (1,072 ) $ 5,783 $ 1,072 $ (12,800 ) $ (5,945 ) Repurchase agreements 603,028 - 603,028 - (683,413 ) (80,385 ) Total $ 609,883 $ (1,072 ) $ 608,811 $ 1,072 $ (696,213 ) $ (86,330 )

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Reclassification	Reclassification
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements
Adoption of New Accounting Standard and Recent Accounting Pronouncements	Adoption of New Accounting Standard No. 2016-09, tax-withholding 2016-09 paid-in Recent Accounting Pronouncements No. 2014-09, No. 2015-14, No. 2014-09 In February 2016, FASB issued ASU No. 2016-02, 2016-02 In June 2016, the FASB issued ASU No. 2016-13, off-balance held-to-maturity available-for-sale No. 2016-13 In August 2016, the FASB issued ASU No. 2016-15, zero-coupon In January 2017, the FASB issued ASU No. 2017-04, 2017-04 In March 2017, the FASB issued ASU No. 2017-08, 310-20): 2017-08 No. 2017-08 In May 2017, the FASB issued ASU No. 2017-09, 2017-09 No. 2017-09 In August 2017, the FASB issued ASU No. 2017-12, 2017-12 non-financial No. 2017-12
Fair Value Hierarchy	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 September 30, 2017. 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 • Level 2 • Level 3

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Value of 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. September 30, 2017 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 1,799,972 $ 22,164 $ (4,102 ) $ 1,818,034 83.57 % CMO/REMIC - residential 291,984 2,665 (867 ) 293,782 13.50 % Municipal bonds 62,657 726 (268 ) 63,115 2.90 % Other securities 717 - - 717 0.03 % Total available-for-sale $ 2,155,330 $ 25,555 $ (5,237 ) $ 2,175,648 100.00 % Investment securities held-to-maturity: Government agency/GSE $ 164,886 $ 1,532 $ (1,489 ) $ 164,929 19.44 % Residential mortgage-backed securities 178,246 880 (61 ) 179,065 21.01 % CMO 229,885 - (6,865 ) 223,020 27.09 % Municipal bonds 275,365 2,800 (3,129 ) 275,036 32.46 % Total held-to-maturity $ 848,382 $ 5,212 $ (11,544 ) $ 842,050 100.00 % December 31, 2016 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSE $ 2,750 $ 2 $ - $ 2,752 0.12 % Residential mortgage-backed securities 1,822,168 18,812 (6,232 ) 1,834,748 80.81 % CMO/REMIC - residential 345,313 3,361 (1,485 ) 347,189 15.29 % Municipal bonds 80,137 889 (955 ) 80,071 3.53 % Other securities 5,506 200 - 5,706 0.25 % Total available-for-sale $ 2,255,874 $ 23,264 $ (8,672 ) $ 2,270,466 100.00 % Investment securities held-to-maturity: Government agency/GSE $ 182,648 $ 362 $ (1,972 ) $ 181,038 20.03 % Residential mortgage-backed securities 193,699 - (1,892 ) 191,807 21.25 % CMO 244,419 - (6,808 ) 237,611 26.81 % Municipal bonds 290,910 776 (4,768 ) 286,918 31.91 % Total held-to-maturity $ 911,676 $ 1,138 $ (15,440 ) $ 897,374 100.00 %
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 For the Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (Dollars in thousands) Investment securities available-for-sale: Taxable $ 11,767 $ 10,546 $ 36,113 $ 32,754 Tax-advantaged 473 879 1,774 3,488 Total interest income from available-for-sale 12,240 11,425 37,887 36,242 Investment securities held-to-maturity: Taxable 3,111 2,349 9,591 7,184 Tax-advantaged 2,073 2,438 6,423 7,694 Total interest income from held-to-maturity 5,184 4,787 16,014 14,878 Total interest income from investment securities $ 17,424 $ 16,212 $ 53,901 $ 51,120
Summary of Continuous Unrealized Loss Position of Securities	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 September 30, 2017 and December 31, 2016. 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”). September 30, 2017 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Fair Value Gross Fair Value Gross (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 352,129 $ (4,102 ) $ - $ - $ 352,129 $ (4,102 ) CMO/REMIC - residential 42,017 (463 ) 33,454 (404 ) 75,471 (867 ) Municipal bonds 15,008 (267 ) 5,996 (1 ) 21,004 (268 ) Total available-for-sale $ 409,154 $ (4,832 ) $ 39,450 $ (405 ) $ 448,604 $ (5,237 ) Investment securities held-to-maturity: Government agency/GSE $ 39,929 $ (1,305 ) $ 5,411 $ (184 ) $ 45,340 $ (1,489 ) Residential mortgage-backed securities 62,677 (61 ) - - 62,677 (61 ) CMO 173,752 (5,200 ) 49,268 (1,665 ) 223,020 (6,865 ) Municipal bonds 66,912 (1,676 ) 32,921 (1,453 ) 99,833 (3,129 ) Total held-to-maturity $ 343,270 $ (8,242 ) $ 87,600 $ (3,302 ) $ 430,870 $ (11,544 ) December 31, 2016 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Fair Value Gross Fair Value Gross (Dollars in thousands) Investment securities available-for-sale: Residential mortgage-backed securities $ 583,143 $ (6,232 ) $ - $ - $ 583,143 $ (6,232 ) CMO/REMIC - residential 128,595 (1,485 ) - - 128,595 (1,485 ) Municipal bonds 23,255 (954 ) 5,981 (1 ) 29,236 (955 ) Total available-for-sale $ 734,993 $ (8,671 ) $ 5,981 $ (1 ) $ 740,974 $ (8,672 ) Investment securities held-to-maturity: Government agency/GSE $ 76,854 $ (1,972 ) $ - $ - $ 76,854 $ (1,972 ) Residential mortgage-backed securities 191,807 (1,892 ) - - 191,807 (1,892 ) CMO 237,611 (6,808 ) - - 237,611 (6,808 ) Municipal bonds 145,804 (3,711 ) 36,971 (1,057 ) 182,775 (4,768 ) Total held-to-maturity $ 652,076 $ (14,383 ) $ 36,971 $ (1,057 ) $ 689,047 $ (15,440 )
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. September 30, 2017 Available-for-sale Held-to-maturity Amortized Fair Value Amortized Fair Value (Dollars in thousands) Due in one year or less $ 18,711 $ 18,895 $ 885 $ 887 Due after one year through five years 1,985,884 2,005,750 251,948 249,473 Due after five years through ten years 116,933 116,800 237,282 235,069 Due after ten years 33,802 34,203 358,267 356,621 Total investment securities $ 2,155,330 $ 2,175,648 $ 848,382 $ 842,050

Acquired SJB Assets and FDIC 23

Acquired SJB Assets and FDIC Loss Sharing Asset (Tables)	9 Months Ended
	Sep. 30, 2017
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. September 30, 2017 December 31, 2016 (Dollars in thousands) Commercial and industrial $ 1,002 $ 2,309 SBA 1,410 327 Real estate: Commercial real estate 33,799 67,594 Construction - - SFR mortgage 166 178 Dairy & livestock and agribusiness 335 1,216 Municipal lease finance receivables - - Consumer and other loans 594 1,469 Gross PCI loans 37,306 73,093 Less: Purchase accounting discount (758 ) (1,508 ) Gross PCI loans, net of discount 36,548 71,585 Less: Allowance for PCI loan losses (431 ) (1,219 ) Net PCI loans $ 36,117 $ 70,366
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. September 30, 2017 December 31, 2016 (Dollars in thousands) Pass $ 32,309 $ 59,409 Special mention 147 1,162 Substandard 4,850 12,522 Doubtful & loss - - Total gross PCI loans $ 37,306 $ 73,093

Loans and Lease Finance Recei24

Loans and Lease Finance Receivables and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of Components of Loans and Lease Finance Receivables, Excluding PCI Loans	The following table provides a summary of total loans and lease finance receivables, excluding PCI loans, by type. September 30, 2017 December 31, 2016 (Dollars in thousands) Commercial and industrial $ 528,659 $ 485,078 SBA 124,091 97,184 Real estate: Commercial real estate 3,332,517 2,930,141 Construction 74,148 85,879 SFR mortgage 244,662 250,605 Dairy & livestock and agribusiness 270,482 338,631 Municipal lease finance receivables 71,352 64,639 Consumer and other loans 70,415 78,274 Gross loans, excluding PCI loans 4,716,326 4,330,431 Less: Deferred loan fees, net (6,450 ) (6,952 ) Gross loans, excluding PCI loans, net of deferred loan fees 4,709,876 4,323,479 Less: Allowance for loan losses (60,200 ) (60,321 ) Net loans, excluding PCI loans 4,649,676 4,263,158 PCI Loans 37,306 73,093 Discount on PCI loans (758 ) (1,508 ) Less: Allowance for loan losses (431 ) (1,219 ) PCI loans, net 36,117 70,366 Total loans and lease finance receivables $ 4,685,793 $ 4,333,524
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. September 30, 2017 Pass Special Substandard Doubtful & Total (Dollars in thousands) Commercial and industrial $ 485,025 $ 30,675 $ 12,959 $ - $ 528,659 SBA 113,423 4,504 6,164 - 124,091 Real estate: Commercial real estate Owner occupied 960,523 88,507 21,327 - 1,070,357 Non-owner 2,238,827 16,363 6,970 - 2,262,160 Construction Speculative 51,596 2,966 - - 54,562 Non-speculative 19,586 - - - 19,586 SFR mortgage 236,027 4,560 4,075 - 244,662 Dairy & livestock and agribusiness 206,720 46,614 17,148 - 270,482 Municipal lease finance receivables 70,723 629 - - 71,352 Consumer and other loans 67,362 1,457 1,594 2 70,415 Total gross loans, excluding PCI loans $ 4,449,812 $ 196,275 $ 70,237 $ 2 $ 4,716,326 December 31, 2016 Pass Special Substandard Doubtful & Total (Dollars in thousands) Commercial and industrial $ 449,658 $ 21,610 $ 13,809 $ 1 $ 485,078 SBA 80,138 10,553 6,482 11 97,184 Real estate: Commercial real estate Owner occupied 842,992 87,781 19,046 - 949,819 Non-owner 1,941,203 23,534 15,585 - 1,980,322 Construction Speculative 48,841 - - - 48,841 Non-speculative 37,038 - - - 37,038 SFR mortgage 243,374 4,930 2,301 - 250,605 Dairy & livestock and agribusiness 187,819 114,106 36,706 - 338,631 Municipal lease finance receivables 60,102 4,537 - - 64,639 Consumer and other loans 74,328 2,123 1,819 4 78,274 Total gross loans, excluding PCI loans $ 3,965,493 $ 269,174 $ 95,748 $ 16 $ 4,330,431
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 For the Three Months Ended September 30, 2017 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,060 $ (138 ) $ 12 $ 129 $ 8,063 SBA 913 - 5 (54 ) 864 Real estate: Commercial real estate 39,927 - - 943 40,870 Construction 1,059 - 2,055 (2,181 ) 933 SFR mortgage 2,369 - - (49 ) 2,320 Dairy & livestock and agribusiness 5,440 - - (66 ) 5,374 Municipal lease finance receivables 852 - - 54 906 Consumer and other loans 922 (9 ) 5 (48 ) 870 PCI loans 659 - - (228 ) 431 Total allowance for loan losses $ 60,201 $ (147 ) $ 2,077 $ (1,500 ) $ 60,631 For the Three Months Ended September 30, 2016 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 9,387 $ - $ 49 $ 30 $ 9,466 SBA 1,177 - 6 (179 ) 1,004 Real estate: Commercial real estate 39,919 - 156 (1,267 ) 38,808 Construction 1,228 - 1,731 (1,851 ) 1,108 SFR mortgage 2,501 - - 70 2,571 Dairy & livestock and agribusiness 4,882 - - 1,089 5,971 Municipal lease finance receivables 1,115 - - (82 ) 1,033 Consumer and other loans 419 (7 ) 128 (100 ) 440 PCI loans 310 - - 290 600 Total allowance for loan losses $ 60,938 $ (7 ) $ 2,070 $ (2,000 ) $ 61,001 For the Nine Months Ended September 30, 2017 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,154 $ (138 ) $ 106 $ (59 ) $ 8,063 SBA 871 - 47 (54 ) 864 Real estate: Commercial real estate 37,443 - 154 3,273 40,870 Construction 1,096 - 5,774 (5,937 ) 933 SFR mortgage 2,287 - 64 (31 ) 2,320 Dairy & livestock and agribusiness 8,541 - 19 (3,186 ) 5,374 Municipal lease finance receivables 941 - - (35 ) 906 Consumer and other loans 988 (11 ) 76 (183 ) 870 PCI loans 1,219 - - (788 ) 431 Total allowance for loan losses $ 61,540 $ (149 ) $ 6,240 $ (7,000 ) $ 60,631 For the Nine Months Ended September 30, 2016 Ending Balance Charge-offs Recoveries (Recapture of) Provision for Loan Losses Ending Balance (Dollars in thousands) Commercial and industrial $ 8,588 $ (85 ) $ 253 $ 710 $ 9,466 SBA 993 - 9 2 1,004 Real estate: Commercial real estate 36,995 - 791 1,022 38,808 Construction 2,389 - 2,615 (3,896 ) 1,108 SFR mortgage 2,103 (102 ) - 570 2,571 Dairy & livestock and agribusiness 6,029 - 206 (264 ) 5,971 Municipal lease finance receivables 1,153 - - (120 ) 1,033 Consumer and other loans 906 (8 ) 166 (624 ) 440 PCI loans - - - 600 600 Total allowance for loan losses $ 59,156 $ (195 ) $ 4,040 $ (2,000 ) $ 61,001
Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type	The following tables present the recorded investment in loans held-for-investment September 30, 2017 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Acquired with Individually Collectively Acquired with (Dollars in thousands) Commercial and industrial $ 745 $ 527,914 $ - $ 2 $ 8,061 $ - SBA 2,273 121,818 - 3 861 - Real estate: Commercial real estate 8,168 3,324,349 - - 40,870 - Construction - 74,148 - - 933 - SFR mortgage 4,550 240,112 - - 2,320 - Dairy & livestock and agribusiness 829 269,653 - - 5,374 - Municipal lease finance receivables - 71,352 - - 906 - Consumer and other loans 743 69,672 - 83 787 - PCI loans - - 36,548 - - 431 Total $ 17,308 $ 4,699,018 $ 36,548 $ 88 $ 60,112 $ 431 September 30, 2016 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Acquired with Individually Collectively Acquired with (Dollars in thousands) Commercial and industrial $ 1,349 $ 493,134 $ - $ 493 $ 8,973 $ - SBA 3,867 100,176 - 33 971 - Real estate: Commercial real estate 15,806 2,895,959 - - 38,808 - Construction 7,651 83,059 - 4 1,104 - SFR mortgage 5,502 235,988 - 6 2,565 - Dairy & livestock and agribusiness 659 238,583 - - 5,971 - Municipal lease finance receivables - 68,309 - - 1,033 - Consumer and other loans 850 78,814 - 12 428 - PCI loans - - 73,035 - - 600 Total $ 35,684 $ 4,194,022 $ 73,035 $ 548 $ 59,853 $ 600
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. September 30, 2017 30-59 Days 60-89 Days Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ 45 $ - $ 45 $ 313 $ 528,301 $ 528,659 SBA - - - 1,611 122,480 124,091 Real estate: Commercial real estate Owner occupied 220 - 220 4,184 1,065,953 1,070,357 Non-owner - - - 2,544 2,259,616 2,262,160 Construction Speculative (2) - - - - 54,562 54,562 Non-speculative - - - - 19,586 19,586 SFR mortgage - - - 1,349 243,313 244,662 Dairy & livestock and agribusiness - - - 829 269,653 270,482 Municipal lease finance receivables - - - - 71,352 71,352 Consumer and other loans 6 - 6 743 69,666 70,415 Total gross loans, excluding PCI Loans $ 271 $ - $ 271 $ 11,573 $ 4,704,482 $ 4,716,326 (1) As of September 30, 2017, $4.5 million of nonaccruing loans were current, $1.4 million were 30-59 60-89 (2) Speculative construction loans are generally for properties where there is no identified buyer or renter. December 31, 2016 30-59 Days 60-89 Days Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ - $ - $ - $ 156 $ 484,922 $ 485,078 SBA 352 - 352 2,737 94,095 97,184 Real estate: Commercial real estate Owner occupied - - - 635 949,184 949,819 Non-owner - - - 1,048 1,979,274 1,980,322 Construction Speculative (2) - - - - 48,841 48,841 Non-speculative - - - - 37,038 37,038 SFR mortgage - - - 2,207 248,398 250,605 Dairy & livestock and agribusiness - - - - 338,631 338,631 Municipal lease finance receivables - - - - 64,639 64,639 Consumer and other loans 84 - 84 369 77,821 78,274 Total gross loans, excluding PCI Loans $ 436 $ - $ 436 $ 7,152 $ 4,322,843 $ 4,330,431 (1) As of December 31, 2016, $4.7 million of nonaccruing loans were current, $514,000 were 30-59 60-89 (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 As of and For the Nine Months Ended Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 726 $ 1,256 $ - $ 870 $ 15 SBA 2,270 2,573 - 2,489 38 Real estate: Commercial real estate Owner occupied 4,313 4,625 - 4,361 42 Non-owner 3,855 5,155 - 4,010 72 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 4,550 5,345 - 4,620 109 Dairy & livestock and agribusiness 829 1,091 - 1,035 1 Municipal lease finance receivables - - - - - Consumer and other loans 356 571 - 381 - Total 16,899 20,616 - 17,766 277 With a related allowance recorded Commercial and industrial 19 20 2 42 1 SBA 3 20 3 7 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner - - - - - Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 387 394 83 390 - Total 409 434 88 439 1 Total impaired loans $ 17,308 $ 21,050 $ 88 $ 18,205 $ 278 As of and For the Nine Months Ended Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 786 $ 1,687 $ - $ 858 $ 20 SBA 3,665 4,452 - 3,770 38 Real estate: Commercial real estate Owner occupied 2,773 3,786 - 3,039 63 Non-owner 13,033 15,764 - 13,386 130 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 5,239 6,118 - 5,370 93 Dairy & livestock and agribusiness 659 722 - 695 24 Municipal lease finance receivables - - - - - Consumer and other loans 838 1,409 - 896 11 Total 26,993 33,938 - 28,014 379 With a related allowance recorded Commercial and industrial 563 625 493 671 8 SBA 202 217 33 209 10 Real estate: Commercial real estate Owner occupied - - - - - Non-owner - - - - - Construction Speculative 7,651 7,651 4 7,651 291 Non-speculative - - - - - SFR mortgage 263 263 6 273 4 Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 12 12 12 12 - Total 8,691 8,768 548 8,816 313 Total impaired loans $ 35,684 $ 42,706 $ 548 $ 36,830 $ 692 As of December 31, 2016 Recorded Unpaid Related (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 730 $ 1,646 $ - SBA 3,386 4,189 - Real estate: Commercial real estate Owner occupied 1,797 2,276 - Non-owner 13,331 15,842 - Construction Speculative - - - Non-speculative - - - SFR mortgage 5,174 6,075 - Dairy & livestock and agribusiness 747 747 - Municipal lease finance receivables - - - Consumer and other loans 853 1,423 - Total 26,018 32,198 - With a related allowance recorded Commercial and industrial 171 171 114 SBA 196 212 27 Real estate: Commercial real estate Owner occupied - - - Non-owner - - - Construction Speculative - - - Non-speculative - - - SFR mortgage - - - Dairy & livestock and agribusiness - - - Municipal lease finance receivables - - - Consumer and other loans - - - Total 367 383 141 Total impaired loans $ 26,385 $ 32,581 $ 141
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 For the Nine Months Ended 2017 2016 2017 2016 (Dollars in thousands) Performing TDRs: Beginning balance $ 16,574 $ 20,292 $ 19,233 $ 42,687 New modifications - 759 3,143 1,877 Payoffs/payments, net and other (10,839 ) (2,584 ) (13,826 ) (26,097 ) TDRs returned to accrual status - 8,551 329 8,551 TDRs placed on nonaccrual status - - (3,144 ) - Ending balance $ 5,735 $ 27,018 $ 5,735 $ 27,018 Nonperforming TDRs: Beginning balance $ 4,391 $ 12,029 $ 1,626 $ 12,622 New modifications - 20 2,066 102 Charge-offs - - - (38 ) Payoffs/payments, net and other (81 ) (465 ) (2,197 ) (1,102 ) TDRs returned to accrual status - (8,551 ) (329 ) (8,551 ) TDRs placed on nonaccrual status - - 3,144 - Ending balance $ 4,310 $ 3,033 $ 4,310 $ 3,033 Total TDRs $ 10,045 $ 30,051 $ 10,045 $ 30,051
Summary of Loans Modified as Troubled Debt Restructurings	The following tables summarize loans modified as troubled debt restructurings for the periods presented. Modifications (1) For the Three Months Ended September 30, 2016 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (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 1 20 20 14 - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner Interest rate reduction - - - - - Change in amortization period or maturity 1 759 759 759 - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Total loans 2 $ 779 $ 779 $ 773 $ - For the Nine Months Ended September 30, 2017 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (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 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 76 - Total loans 3 $ 5,209 $ 5,209 $ 3,297 $ - For the Nine Months Ended September 30, 2016 Number of Pre-Modification Post-Modification Investment Outstanding Investment at Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity 1 112 112 184 - SBA: Interest rate reduction - - - - - Change in amortization period or maturity 2 214 214 202 28 Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner Interest rate reduction - - - - - Change in amortization period or maturity 1 759 759 759 - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Change in amortization period or maturity 1 24 24 22 - Total loans 5 $ 1,109 $ 1,109 $ 1,167 $ 28 (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 Reconcilia25

Earnings Per Share Reconciliation (Tables)	9 Months Ended
	Sep. 30, 2017
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 For the Nine Months 2017 2016 2017 2016 (In thousands, except per share amounts) Earnings per common share: Net earnings $ 29,683 $ 25,448 $ 86,560 $ 74,353 Less: Net earnings allocated to restricted stock 107 98 325 305 Net earnings allocated to common shareholders $ 29,576 $ 25,350 $ 86,235 $ 74,048 Weighted average shares outstanding 109,754 108,984 109,280 107,144 Basic earnings per common share $ 0.27 $ 0.23 $ 0.79 $ 0.69 Diluted earnings per common share: Net income allocated to common shareholders $ 29,576 $ 25,350 $ 86,235 $ 74,048 Weighted average shares outstanding 109,754 108,984 109,280 107,144 Incremental shares from assumed exercise of outstanding options 365 386 392 403 Diluted weighted average shares outstanding 110,119 109,370 109,672 107,547 Diluted earnings per common share $ 0.27 $ 0.23 $ 0.79 $ 0.69

Fair Value Information (Tables)

Fair Value Information (Tables)	9 Months Ended
	Sep. 30, 2017
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 Quoted Prices in Significant Other (Level 2) Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSE $ - $ - $ - $ - Residential mortgage-backed securities 1,818,034 - 1,818,034 - CMO/REMIC - residential 293,782 - 293,782 - Municipal bonds 63,115 - 63,115 - Other securities 717 - 717 - Total investment securities - AFS 2,175,648 - 2,175,648 - Interest rate swaps 4,819 - 4,819 - Total assets $ 2,180,467 $ - $ 2,180,467 $ - Description of liability Interest rate swaps $ 4,819 $ - $ 4,819 $ - Total liabilities $ 4,819 $ - $ 4,819 $ - Carrying Value at Quoted Prices in Active Markets for Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSE $ 2,752 $ - $ 2,752 $ - Residential mortgage-backed securities 1,834,748 - 1,834,748 - CMO/REMIC - residential 347,189 - 347,189 - Municipal bonds 80,071 - 80,071 - Other securities 5,706 - 5,706 - Total investment securities - AFS 2,270,466 - 2,270,466 - Interest rate swaps 5,783 - 5,783 - Total assets $ 2,276,249 $ - $ 2,276,249 $ - Description of liability Interest rate swaps $ 5,783 $ - $ 5,783 $ - Total liabilities $ 5,783 $ - $ 5,783 $ -
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	For assets measured at fair value on a non-recurring Carrying Value at Quoted Prices in Significant Other Significant Total Losses (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 386 - - 386 83 Other real estate owned - - - - - Asset held-for-sale - - - - - Total assets $ 386 $ - $ - $ 386 $ 83 Carrying Value at Quoted Prices in Significant Other Significant Total Losses (Dollars in thousands) Description of assets Impaired loans, excluding PCI loans: Commercial and industrial $ 65 $ - $ - $ 65 $ 8 SBA 196 - - 196 27 Real estate: Commercial real estate - - - - - Construction - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness - - - - - Consumer and other loans - - - - - Other real estate owned - - - - - Asset held-for-sale 3,411 3,411 2,558 Total assets $ 3,672 $ - $ - $ 3,672 $ 2,593
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. September 30, 2017 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 143,790 $ 143,790 $ - $ - $ 143,790 Interest-earning balances due from depository institutions 20,521 - 20,567 - 20,567 FHLB stock 17,688 - 17,688 - 17,688 Investment securities available-for-sale 2,175,648 - 2,175,648 - 2,175,648 Investment securities held-to-maturity 848,382 - 842,050 - 842,050 Total loans, net of allowance for loan losses 4,685,793 - - 4,619,896 4,619,896 Swaps 4,819 - 4,819 - 4,819 Liabilities Deposits: Noninterest-bearing $ 3,908,809 $ 3,908,809 $ - $ - $ 3,908,809 Interest-bearing 2,699,287 - 2,697,349 - 2,697,349 Borrowings 518,069 - 517,827 - 517,827 Junior subordinated debentures 25,774 - - 18,260 18,260 Swaps 4,819 - 4,819 - 4,819 December 31, 2016 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 119,445 $ 119,445 $ - $ - $ 119,445 Interest-earning balances due from depository institutions 2,188 - 2,188 - 2,188 FHLB stock 17,688 - 17,688 - 17,688 Investment securities available-for-sale 2,270,466 - 2,270,466 - 2,270,466 Investment securities held-to-maturity 911,676 - 897,374 - 897,374 Total loans, net of allowance for loan losses 4,333,524 - - 4,306,225 4,306,225 Swaps 5,783 - 5,783 - 5,783 Liabilities Deposits: Noninterest-bearing $ 3,673,541 $ 3,673,541 $ - $ - $ 3,673,541 Interest-bearing 2,636,139 - 2,634,443 - 2,634,443 Borrowings 656,028 - 655,820 - 655,820 Junior subordinated debentures 25,774 - - 18,463 18,463 Swaps 5,783 - 5,783 - 5,783

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 50,539 $ 2,728 $ 18,472 $ 71,739 (Recapture of) provision for loan losses 772 (66 ) (2,206 ) (1,500 ) Net interest income after (recapture of) provision for loan losses 49,767 2,794 20,678 73,239 Noninterest income 5,764 84 4,190 10,038 Noninterest expense 12,963 479 21,264 34,706 Segment pre-tax $ 42,568 $ 2,399 $ 3,604 $ 48,571 Goodwill $ 116,564 $ - $ - $ 116,564 Segment assets as of September 30, 2017 $ 7,166,356 $ 377,670 $ 759,986 $ 8,304,012 (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 September 30, 2016 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 45,499 $ 2,008 $ 15,654 $ 63,161 (Recapture of) provision for loan losses (1,164 ) 1,089 (1,925 ) (2,000 ) Net interest income after (recapture of) provision for loan losses 46,663 919 17,579 65,161 Noninterest income 5,182 73 3,928 9,183 Noninterest expense 12,423 474 20,109 33,006 Segment pre-tax $ 39,422 $ 518 $ 1,398 $ 41,338 Goodwill $ 88,174 $ - $ - $ 88,174 Segment assets as of September 30, 2016 $ 6,945,214 $ 376,862 $ 722,917 $ 8,044,993 (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 Nine Months Ended September 30, 2017 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 144,879 $ 7,241 $ 55,535 $ 207,655 (Recapture of) provision for loan losses 2,158 (3,186 ) (5,972 ) (7,000 ) Net interest income after (recapture of) provision for loan losses 142,721 10,427 61,507 214,655 Noninterest income 16,274 188 13,074 29,536 Noninterest expense 38,607 1,484 65,605 105,696 Segment pre-tax $ 120,388 $ 9,131 $ 8,976 $ 138,495 Goodwill $ 116,564 $ - $ - $ 116,564 Segment assets as of September 30, 2017 $ 7,166,356 $ 377,670 $ 759,986 $ 8,304,012 (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 Nine Months Ended September 30, 2016 Centers Dairy & livestock and agribusiness Other (1) Total (Dollars in thousands) Net interest income $ 132,316 $ 5,927 $ 53,390 $ 191,633 (Recapture of) provision for loan losses 2,251 (264 ) (3,987 ) (2,000 ) Net interest income after (recapture of) provision for loan losses 130,065 6,191 57,377 193,633 Noninterest income 15,335 180 11,625 27,140 Noninterest expense 37,924 1,452 62,432 101,808 Segment pre-tax $ 107,476 $ 4,919 $ 6,570 $ 118,965 Goodwill $ 88,174 $ - $ - $ 88,174 Segment assets as of September 30, 2016 $ 6,945,214 $ 376,862 $ 722,917 $ 8,044,993 (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 Instrume28

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	As of September 30, 2017 and December 31, 2016, the total notional amount of the Company’s swaps was $199.9 million, and $202.7 million, respectively. The location of the asset and liability, and their respective fair values are summarized in the tables below. September 30, 2017 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 4,819 Other liabilities $ 4,819 Total derivatives $ 4,819 $ 4,819 December 31, 2016 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 5,783 Other liabilities $ 5,783 Total derivatives $ 5,783 $ 5,783
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 For the Nine Months Ended 2017 2016 2017 2016 (Dollars in thousands) Interest rate swaps Other income $ 198 $ 136 $ 592 $ 521 Total $ 198 $ 136 $ 592 $ 521

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 2016 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 $ 2,083 $ 875 $ 1,208 $ (4,006 ) $ (1,683 ) $ (2,323 ) Amortization of unrealized gain (loss) on securities transferred from available-for-sale held-to-maturity (862 ) (362 ) (500 ) 297 125 172 Net realized gain reclassified into earnings (1) - - - (548 ) (230 ) (318 ) Net change $ 1,221 $ 513 $ 708 $ (4,257 ) $ (1,788 ) $ (2,469 ) For the Nine Months Ended September 30, 2017 2016 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 $ 6,128 $ 2,574 $ 3,554 $ 31,617 $ 13,279 $ 18,338 Amortization of unrealized gain on securities transferred from available-for-sale held-to-maturity (2,841 ) (1,193 ) (1,648 ) (563 ) (237 ) (326 ) Net realized gain reclassified into earnings (1) (402 ) (169 ) (233 ) (548 ) (230 ) (318 ) Net change $ 2,885 $ 1,212 $ 1,673 $ 30,506 $ 12,812 $ 17,694 (1) Included in other noninterest income.

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Schedule of Balance Sheet Offsetting	The repurchase agreements are not offset in the condensed consolidated balances. Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset in the Condensed Consolidated Balance Net Amount Consolidated Consolidated Consolidated Financial Collateral (Dollars in thousands) September 30, 2017 Financial assets: Derivatives not designated as hedging instruments $ 4,819 $ - $ - $ 4,819 $ - $ 4,819 Total $ 4,819 $ - $ - $ 4,819 $ - $ 4,819 Financial liabilities: Derivatives not designated as hedging instruments $ 5,709 $ (890 ) $ 4,819 $ 890 $ (12,778 ) $ (7,069 ) Repurchase agreements 455,069 - 455,069 - (510,351 ) (55,282 ) Total $ 460,778 $ (890 ) $ 459,888 $ 890 $ (523,129 ) $ (62,351 ) December 31, 2016 Financial assets: Derivatives not designated as hedging instruments $ 5,783 $ - $ - $ 5,783 $ - $ 5,783 Total $ 5,783 $ - $ - $ 5,783 $ - $ 5,783 Financial liabilities: Derivatives not designated as hedging instruments $ 6,855 $ (1,072 ) $ 5,783 $ 1,072 $ (12,800 ) $ (5,945 ) Repurchase agreements 603,028 - 603,028 - (683,413 ) (80,385 ) Total $ 609,883 $ (1,072 ) $ 608,811 $ 1,072 $ (696,213 ) $ (86,330 )

Business - Additional Informati

Business - Additional Information (Detail) $ in Millions	Mar. 10, 2017USD ($)Branch	Sep. 30, 2017LocationSubsidiary
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary		1
Bank operated banking centers, number		51
Bank operated trust office locations, number		3
Valley Commerce Bancorp [Member]
Schedule Of Description Of Company [Line Items]
Total assets of acquired/merger company | $	$ 400
Number of bank branches acquired | Branch	4

Summary of Significant Accoun32

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits recognized in provision for income taxes	$ 1.5

Business Combinations - Additio

Business Combinations - Additional Information (Detail)	Mar. 10, 2017USD ($)Branch	Feb. 29, 2016USD ($)Branch	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Acquisition date					Oct. 16, 2009
Goodwill			$ 116,564,000	$ 88,174,000	$ 116,564,000	$ 88,174,000	$ 89,533,000
Non-recurring merger related expenses			250,000	353,000	$ 2,176,000	1,557,000
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
Non-recurring merger related expenses			$ 250,000		$ 2,200,000
Valley Business Bank [Member]
Business Acquisition [Line Items]
Number of branches owned by merger company | Branch	4
County Commerce Bank [Member]
Business Acquisition [Line Items]
Acquisition date					Feb. 29, 2016
Number of branches owned by merger company | Branch		4
Acquired assets and assumed liabilities for cash		$ 20,600,000
Assets and assumed all of the liabilities, stock		21,600,000
Goodwill		15,300,000
Total fair value of assets acquired		252,400,000
Cash and cash equivalents		54,800,000
FHLB stock		1,500,000
Loans and lease finance receivables		168,000,000
Fixed assets		8,600,000
Core deposit intangible assets		3,900,000
Other assets		289,000
Total fair value of liabilities assumed		230,800,000
Deposits		224,200,000
Other liabilities		1,600,000
Non-recurring merger related expenses				$ 145,000		$ 1,300,000
FHLB advances		$ 5,000,000

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 2,155,330	$ 2,255,874
Gross Unrealized Holding Gain, Available-for-sale	25,555	23,264
Gross Unrealized Holding Loss, Available-for-sale	(5,237)	(8,672)
Fair Value, Available-for-sale	$ 2,175,648	$ 2,270,466
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 848,382	$ 911,676
Gross Unrealized Holding Gain, Held-to-maturity	5,212	1,138
Gross Unrealized Holding Loss, Held-to-maturity	(11,544)	(15,440)
Fair Value, Held-to-maturity	$ 842,050	$ 897,374
Total Percent, Held-to-maturity	100.00%	100.00%
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 291,984	$ 345,313
Gross Unrealized Holding Gain, Available-for-sale	2,665	3,361
Gross Unrealized Holding Loss, Available-for-sale	(867)	(1,485)
Fair Value, Available-for-sale	$ 293,782	$ 347,189
Total Percent, Available-for-sale	13.50%	15.29%
Amortized Cost, Held-to-maturity	$ 229,885	$ 244,419
Gross Unrealized Holding Gain, Held-to-maturity	0	0
Gross Unrealized Holding Loss, Held-to-maturity	(6,865)	(6,808)
Fair Value, Held-to-maturity	$ 223,020	$ 237,611
Total Percent, Held-to-maturity	27.09%	26.81%
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale		$ 2,750
Gross Unrealized Holding Gain, Available-for-sale		2
Gross Unrealized Holding Loss, Available-for-sale		0
Fair Value, Available-for-sale		$ 2,752
Total Percent, Available-for-sale		0.12%
Amortized Cost, Held-to-maturity	$ 164,886	$ 182,648
Gross Unrealized Holding Gain, Held-to-maturity	1,532	362
Gross Unrealized Holding Loss, Held-to-maturity	(1,489)	(1,972)
Fair Value, Held-to-maturity	$ 164,929	$ 181,038
Total Percent, Held-to-maturity	19.44%	20.03%
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 1,799,972	$ 1,822,168
Gross Unrealized Holding Gain, Available-for-sale	22,164	18,812
Gross Unrealized Holding Loss, Available-for-sale	(4,102)	(6,232)
Fair Value, Available-for-sale	$ 1,818,034	$ 1,834,748
Total Percent, Available-for-sale	83.57%	80.81%
Amortized Cost, Held-to-maturity	$ 178,246	$ 193,699
Gross Unrealized Holding Gain, Held-to-maturity	880	0
Gross Unrealized Holding Loss, Held-to-maturity	(61)	(1,892)
Fair Value, Held-to-maturity	$ 179,065	$ 191,807
Total Percent, Held-to-maturity	21.01%	21.25%
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 62,657	$ 80,137
Gross Unrealized Holding Gain, Available-for-sale	726	889
Gross Unrealized Holding Loss, Available-for-sale	(268)	(955)
Fair Value, Available-for-sale	$ 63,115	$ 80,071
Total Percent, Available-for-sale	2.90%	3.53%
Amortized Cost, Held-to-maturity	$ 275,365	$ 290,910
Gross Unrealized Holding Gain, Held-to-maturity	2,800	776
Gross Unrealized Holding Loss, Held-to-maturity	(3,129)	(4,768)
Fair Value, Held-to-maturity	$ 275,036	$ 286,918
Total Percent, Held-to-maturity	32.46%	31.91%
Other Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost, Available-for-sale	$ 717	$ 5,506
Gross Unrealized Holding Gain, Available-for-sale	0	200
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 717	$ 5,706
Total Percent, Available-for-sale	0.03%	0.25%

Investment Securities - Summa35

Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 12,240	$ 11,425	$ 37,887	$ 36,242
Total interest income from held-to-maturity securities	5,184	4,787	16,014	14,878
Total investment income	17,424	16,212	53,901	51,120
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	11,767	10,546	36,113	32,754
Tax-advantaged	473	879	1,774	3,488
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	3,111	2,349	9,591	7,184
Tax-advantaged	$ 2,073	$ 2,438	$ 6,423	$ 7,694

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Investment securities pledged as collateral	$ 1,880,000,000	$ 2,190,000,000
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 - Summa37

Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 409,154	$ 734,993
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(4,832)	(8,671)
Fair Value, 12 Months or Longer, Available-for-sale	39,450	5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(405)	(1)
Fair Value, Available-for-sale	448,604	740,974
Gross Unrealized Holding Losses, Available-for-sale	(5,237)	(8,672)
Fair Value, Less Than 12 Months, Held-to-maturity	343,270	652,076
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(8,242)	(14,383)
Fair Value, 12 Months or Longer, Held-to-maturity	87,600	36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(3,302)	(1,057)
Fair Value, Held-to-maturity	430,870	689,047
Gross Unrealized Holding Losses, Held-to-maturity	(11,544)	(15,440)
CMO/REMIC - Residential [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	42,017	128,595
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(463)	(1,485)
Fair Value, 12 Months or Longer, Available-for-sale	33,454	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(404)	0
Fair Value, Available-for-sale	75,471	128,595
Gross Unrealized Holding Losses, Available-for-sale	(867)	(1,485)
Fair Value, Less Than 12 Months, Held-to-maturity	173,752	237,611
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(5,200)	(6,808)
Fair Value, 12 Months or Longer, Held-to-maturity	49,268	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(1,665)	0
Fair Value, Held-to-maturity	223,020	237,611
Gross Unrealized Holding Losses, Held-to-maturity	(6,865)	(6,808)
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Held-to-maturity	39,929	76,854
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(1,305)	(1,972)
Fair Value, 12 Months or Longer, Held-to-maturity	5,411	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(184)	0
Fair Value, Held-to-maturity	45,340	76,854
Gross Unrealized Holding Losses, Held-to-maturity	(1,489)	(1,972)
Residential Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	352,129	583,143
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(4,102)	(6,232)
Fair Value, 12 Months or Longer, Available-for-sale	0	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	0
Fair Value, Available-for-sale	352,129	583,143
Gross Unrealized Holding Losses, Available-for-sale	(4,102)	(6,232)
Fair Value, Less Than 12 Months, Held-to-maturity	62,677	191,807
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(61)	(1,892)
Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0	0
Fair Value, Held-to-maturity	62,677	191,807
Gross Unrealized Holding Losses, Held-to-maturity	(61)	(1,892)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	15,008	23,255
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(267)	(954)
Fair Value, 12 Months or Longer, Available-for-sale	5,996	5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(1)	(1)
Fair Value, Available-for-sale	21,004	29,236
Gross Unrealized Holding Losses, Available-for-sale	(268)	(955)
Fair Value, Less Than 12 Months, Held-to-maturity	66,912	145,804
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	(1,676)	(3,711)
Fair Value, 12 Months or Longer, Held-to-maturity	32,921	36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(1,453)	(1,057)
Fair Value, Held-to-maturity	99,833	182,775
Gross Unrealized Holding Losses, Held-to-maturity	$ (3,129)	$ (4,768)

Investment Securities - Summa38

Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost, Held-to-maturity	$ 885
Due after one year through five years, Amortized Cost, Held-to-maturity	251,948
Due after five years through ten years, Amortized Cost, Held-to-maturity	237,282
Due after ten years, Amortized Cost, Held-to-maturity	358,267
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis	848,382
Due in one year or less, Fair Value, Held-to-maturity	887
Due after one year through five years, Fair Value, Held-to-maturity	249,473
Due after five years through ten years, Fair Value, Held-to-maturity	235,069
Due after ten years, Fair Value, Held-to-maturity	356,621
Total, Held-to-maturity, Fair Value	842,050
Due in one year or less, Amortized Cost, Available-for-sale	18,711
Due after one year through five years, Amortized Cost, Available-for-sale	1,985,884
Due after five years through ten years, Amortized Cost, Available-for-sale	116,933
Due after ten years, Amortized Cost, Available-for-sale	33,802
Amortized Cost, Available-for-sale	2,155,330	$ 2,255,874
Due in one year or less, Fair Value, Available-for-sale	18,895
Due after one year through five years, Fair Value, Available-for-sale	2,005,750
Due after five years through ten years, Fair Value, Available-for-sale	116,800
Due after ten years, Fair Value, Available-for-sale	34,203
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value	$ 2,175,648	$ 2,270,466

Acquired SJB Assets and FDIC 39

Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Business Acquisition [Line Items]
Acquisition date	Oct. 16, 2009
Remaining discount associated with SJB loans	$ 758
Single Family Residential Loans [Member]
Business Acquisition [Line Items]
Loans expiration date	Oct. 16, 2019

Acquired SJB Assets and FDIC 40

Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans and Lease Finance Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Real estate:
Less: Purchase accounting discount	$ (758)
Gross PCI loans, net of discount	36,548		$ 73,035
Less: Allowance for PCI loan losses	(431)		(600)
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	1,002	$ 2,309
SBA	1,410	327
Real estate:
Commercial real estate	33,799	67,594
Construction	0	0
SFR mortgage	166	178
Dairy & livestock and agribusiness	335	1,216
Municipal lease finance receivables	0	0
Consumer and other loans	594	1,469
Gross PCI loans	37,306	73,093
Less: Purchase accounting discount	(758)	(1,508)
Gross PCI loans, net of discount	36,548	71,585	73,035
Less: Allowance for PCI loan losses	(431)	(1,219)	$ (600)
Net loans	$ 36,117	$ 70,366

Acquired SJB Assets and FDIC 41

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	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	$ 37,306	$ 73,093
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	32,309	59,409
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	147	1,162
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	4,850	12,522
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross PCI loans	$ 0	$ 0

Loans and Lease Finance Recei42

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	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding PCI loans, net of deferred loan fees	$ 4,746,424		$ 4,395,064
Less: Allowance for loan losses	(60,631)	$ (60,201)	(61,540)	$ (61,001)	$ (60,938)	$ (59,156)
Total loans and lease finance receivables	4,685,793		4,333,524
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	1,002		2,309
PCI Loans	37,306		73,093
SBA	1,410		327
Discount on PCI loans	(758)		(1,508)
Commercial real estate	33,799		67,594
Construction	0		0
SFR mortgage	166		178
Dairy & livestock and agribusiness	335		1,216
Municipal lease finance receivables	0		0
Consumer and other loans	594		1,469
Less: Allowance for loan losses	(431)	$ (659)	(1,219)	$ (600)	$ (310)	$ 0
Net loans	36,117		70,366
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	528,659		485,078
SBA	124,091		97,184
Commercial real estate	3,332,517		2,930,141
Construction	74,148		85,879
SFR mortgage	244,662		250,605
Dairy & livestock and agribusiness	270,482		338,631
Municipal lease finance receivables	71,352		64,639
Consumer and other loans	70,415		78,274
Total gross loans, excluding PCI loans	4,716,326		4,330,431
Less: Deferred loan fees, net	(6,450)		(6,952)
Gross loans, excluding PCI loans, net of deferred loan fees	4,709,876		4,323,479
Less: Allowance for loan losses	(60,200)		(60,321)
Net loans	$ 4,649,676		$ 4,263,158

Loans and Lease Finance Recei43

Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)Contract	Sep. 30, 2017USD ($)ContractSecurityLoan	Sep. 30, 2016USD ($)Contract	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total fixed rate loans held	$ 2,160,000,000		$ 2,160,000,000
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank	3,610,000,000		3,610,000,000		$ 3,110,000,000
Loans held-for-sale	0		0		0
Impaired, at carrying value	17,308,000	$ 35,684,000	17,308,000	$ 35,684,000	26,385,000
Loans classified as troubled debt restructured	10,000,000		10,000,000
Impaired, at carrying value	88,000	548,000	88,000	548,000	141,000
Provision for unfunded loan commitments	0	$ 0	0	$ 0
Reserve for credit risk for undisbursed commitments	6,700,000		6,700,000		6,700,000
Allocation of allowance to troubled debt restructuring	$ 5,000		$ 5,000		141,000
Number of loans modified as TDRs | Contract	0	2	3	5
Valley Business Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	$ 4,500,000		$ 4,500,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	70.66%		70.66%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.42%		77.42%
Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 829,000		$ 829,000
Commercial real estate loan outstanding balance modified as a TDR within the previous 12 months that subsequently defaulted			$ 78,000
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract			1
Nonaccrual Small Business Administration Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,600,000		$ 1,600,000
Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	10,000,000		10,000,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loan outstanding balance modified as a TDR within the previous 12 months that subsequently defaulted			$ 3,100,000
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract			1
Nonaccrual Single Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,300,000		$ 1,300,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	6,700,000		6,700,000
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	743,000		743,000
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	4,300,000		4,300,000
Loans classified as troubled debt restructured	4,300,000		4,300,000
Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	5,700,000		$ 5,700,000
Number of performing loans | SecurityLoan			21
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	1,400,000		$ 1,400,000
Number of loans | SecurityLoan			3
Performing Financing Receivable [Member] | Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	3,200,000		$ 3,200,000
Number of loans | SecurityLoan			11
Performing Financing Receivable [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	432,000		$ 432,000
Number of loans | SecurityLoan			5
Performing Financing Receivable [Member] | Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	662,000		$ 662,000
Number of loans | SecurityLoan			2
Performing Financing Receivable [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	0		$ 0
Number of loans | SecurityLoan			0
Allowance Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	88,000		$ 88,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	3,332,517,000		3,332,517,000		2,930,141,000
Dairy & livestock and agribusiness	270,482,000		270,482,000		338,631,000
Outstanding balance	11,573,000		11,573,000		7,152,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	235,200,000		235,200,000		317,900,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	35,300,000		35,300,000		20,700,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	829,000		829,000		0
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	313,000		313,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	313,000		313,000		156,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,611,000		1,611,000		2,737,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 743,000		$ 743,000		$ 369,000
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)	5.41%		5.41%		6.16%
Commercial real estate loans	$ 180,200,000		$ 180,200,000		$ 180,600,000
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	102,000,000		102,000,000		127,100,000
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	$ 78,200,000		$ 78,200,000		$ 53,600,000

Loans and Lease Finance Recei44

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	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	$ 528,659	$ 485,078
SBA	124,091	97,184
Commercial real estate, Owner occupied	1,070,357	949,819
Commercial real estate, Non-owner occupied	2,262,160	1,980,322
Construction, Speculative	54,562	48,841
Construction, Non-speculative	19,586	37,038
SFR mortgage	244,662	250,605
Dairy & livestock and agribusiness	270,482	338,631
Municipal lease finance receivables	71,352	64,639
Consumer and other loans	70,415	78,274
Total gross loans, excluding PCI loans	4,716,326	4,330,431
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	485,025	449,658
SBA	113,423	80,138
Commercial real estate, Owner occupied	960,523	842,992
Commercial real estate, Non-owner occupied	2,238,827	1,941,203
Construction, Speculative	51,596	48,841
Construction, Non-speculative	19,586	37,038
SFR mortgage	236,027	243,374
Dairy & livestock and agribusiness	206,720	187,819
Municipal lease finance receivables	70,723	60,102
Consumer and other loans	67,362	74,328
Total gross loans, excluding PCI loans	4,449,812	3,965,493
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	30,675	21,610
SBA	4,504	10,553
Commercial real estate, Owner occupied	88,507	87,781
Commercial real estate, Non-owner occupied	16,363	23,534
Construction, Speculative	2,966	0
Construction, Non-speculative	0	0
SFR mortgage	4,560	4,930
Dairy & livestock and agribusiness	46,614	114,106
Municipal lease finance receivables	629	4,537
Consumer and other loans	1,457	2,123
Total gross loans, excluding PCI loans	196,275	269,174
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	12,959	13,809
SBA	6,164	6,482
Commercial real estate, Owner occupied	21,327	19,046
Commercial real estate, Non-owner occupied	6,970	15,585
Construction, Speculative	0	0
Construction, Non-speculative	0	0
SFR mortgage	4,075	2,301
Dairy & livestock and agribusiness	17,148	36,706
Municipal lease finance receivables	0	0
Consumer and other loans	1,594	1,819
Total gross loans, excluding PCI loans	70,237	95,748
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	0	1
SBA	0	11
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	2	4
Total gross loans, excluding PCI loans	$ 2	$ 16

Loans and Lease Finance Recei45

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 60,201	$ 60,938	$ 61,540	$ 59,156
Charge-offs	(147)	(7)	(149)	(195)
Recoveries	2,077	2,070	6,240	4,040
(Recapture of) provision for loan losses	(1,500)	(2,000)	(7,000)	(2,000)
Ending Balance	60,631	61,001	60,631	61,001
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	659	310	1,219	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
(Recapture of) provision for loan losses	(228)	290	(788)	600
Ending Balance	431	600	431	600
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	8,060	9,387	8,154	8,588
Charge-offs	(138)	0	(138)	(85)
Recoveries	12	49	106	253
(Recapture of) provision for loan losses	129	30	(59)	710
Ending Balance	8,063	9,466	8,063	9,466
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	913	1,177	871	993
Charge-offs	0	0	0	0
Recoveries	5	6	47	9
(Recapture of) provision for loan losses	(54)	(179)	(54)	2
Ending Balance	864	1,004	864	1,004
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	39,927	39,919	37,443	36,995
Charge-offs	0	0	0	0
Recoveries	0	156	154	791
(Recapture of) provision for loan losses	943	(1,267)	3,273	1,022
Ending Balance	40,870	38,808	40,870	38,808
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,059	1,228	1,096	2,389
Charge-offs	0	0	0	0
Recoveries	2,055	1,731	5,774	2,615
(Recapture of) provision for loan losses	(2,181)	(1,851)	(5,937)	(3,896)
Ending Balance	933	1,108	933	1,108
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,369	2,501	2,287	2,103
Charge-offs	0	0	0	(102)
Recoveries	0	0	64	0
(Recapture of) provision for loan losses	(49)	70	(31)	570
Ending Balance	2,320	2,571	2,320	2,571
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5,440	4,882	8,541	6,029
Charge-offs	0	0	0	0
Recoveries	0	0	19	206
(Recapture of) provision for loan losses	(66)	1,089	(3,186)	(264)
Ending Balance	5,374	5,971	5,374	5,971
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	852	1,115	941	1,153
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
(Recapture of) provision for loan losses	54	(82)	(35)	(120)
Ending Balance	906	1,033	906	1,033
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	922	419	988	906
Charge-offs	(9)	(7)	(11)	(8)
Recoveries	5	128	76	166
(Recapture of) provision for loan losses	(48)	(100)	(183)	(624)
Ending Balance	$ 870	$ 440	$ 870	$ 440

Loans and Lease Finance Recei46

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	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 17,308		$ 35,684
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,699,018		4,194,022
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	36,548		73,035
Allowance for Loan Losses, Individually Evaluated for Impairment	88		548
Allowance for Loan Losses, Collectively Evaluated for Impairment	60,112		59,853
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	431		600
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 Deteriorated Credit Quality	36,548	$ 71,585	73,035
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 Deteriorated Credit Quality	431	$ 1,219	600
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	745		1,349
Recorded Investment in Loans, Collectively Evaluated for Impairment	527,914		493,134
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	2		493
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,061		8,973
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	0		0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	2,273		3,867
Recorded Investment in Loans, Collectively Evaluated for Impairment	121,818		100,176
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	3		33
Allowance for Loan Losses, Collectively Evaluated for Impairment	861		971
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	0		0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	8,168		15,806
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,324,349		2,895,959
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	40,870		38,808
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	0		0
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		7,651
Recorded Investment in Loans, Collectively Evaluated for Impairment	74,148		83,059
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		4
Allowance for Loan Losses, Collectively Evaluated for Impairment	933		1,104
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	0		0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	4,550		5,502
Recorded Investment in Loans, Collectively Evaluated for Impairment	240,112		235,988
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		6
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,320		2,565
Allowance for Loan Losses, Acquired with Deteriorated 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	829		659
Recorded Investment in Loans, Collectively Evaluated for Impairment	269,653		238,583
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,374		5,971
Allowance for Loan Losses, Acquired with Deteriorated 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	71,352		68,309
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	906		1,033
Allowance for Loan Losses, Acquired with Deteriorated 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	743		850
Recorded Investment in Loans, Collectively Evaluated for Impairment	69,672		78,814
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	83		12
Allowance for Loan Losses, Collectively Evaluated for Impairment	787		428
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality	$ 0		$ 0

Loans and Lease Finance Recei47

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 (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	$ 1,400	$ 514
60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	423	435
Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	829
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	271	436
Nonaccrual	11,573	7,152
Current	4,704,482	4,322,843
Total gross loans, excluding PCI loans	4,716,326	4,330,431
Loans, Excluding PCI Loans [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	271	436
Loans, Excluding PCI Loans [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	45	0
Nonaccrual	313	156
Current	528,301	484,922
Total gross loans, excluding PCI loans	528,659	485,078
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	45	0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	352
Nonaccrual	1,611	2,737
Current	122,480	94,095
Total gross loans, excluding PCI loans	124,091	97,184
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	352
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	220	0
Nonaccrual	4,184	635
Current	1,065,953	949,184
Total gross loans, excluding PCI loans	1,070,357	949,819
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	220	0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	2,544	1,048
Current	2,259,616	1,979,274
Total gross loans, excluding PCI loans	2,262,160	1,980,322
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	54,562	48,841
Total gross loans, excluding PCI loans	54,562	48,841
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	19,586	37,038
Total gross loans, excluding PCI loans	19,586	37,038
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	1,349	2,207
Current	243,313	248,398
Total gross loans, excluding PCI loans	244,662	250,605
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	829	0
Current	269,653	338,631
Total gross loans, excluding PCI loans	270,482	338,631
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	71,352	64,639
Total gross loans, excluding PCI loans	71,352	64,639
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	6	84
Nonaccrual	743	369
Current	69,666	77,821
Total gross loans, excluding PCI loans	70,415	78,274
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] | 30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	6	84
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] | 60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	$ 0	$ 0

Loans and Lease Finance Recei48

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	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing loans, current	$ 4,500	$ 4,700
30-59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	1,400	514
60-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	423	435
90+ Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual	$ 5,300	$ 1,500

Loans and Lease Finance Recei49

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	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 16,899	$ 26,993	$ 26,018
Recorded Investment, With a related allowance recorded	409	8,691	367
Recorded Investment, Total impaired loans	17,308	35,684	26,385
Unpaid Principal Balance, With no related allowance recorded	20,616	33,938	32,198
Unpaid Principal Balance, With a related allowance recorded	434	8,768	383
Unpaid Principal Balance, Total impaired loans	21,050	42,706	32,581
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	88	548	141
Related Allowance, Total impaired loans	88	548	141
Average Recorded Investment, With no related allowance recorded	17,766	28,014
Average Recorded Investment, With a related allowance recorded	439	8,816
Average Recorded Investment, Total impaired loans	18,205	36,830
Interest Income Recognized, With no related allowance recorded	277	379
Interest Income Recognized, With a related allowance recorded	1	313
Interest Income Recognized, Total impaired loans	278	692
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	726	786	730
Recorded Investment, With a related allowance recorded	19	563	171
Unpaid Principal Balance, With no related allowance recorded	1,256	1,687	1,646
Unpaid Principal Balance, With a related allowance recorded	20	625	171
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	2	493	114
Average Recorded Investment, With no related allowance recorded	870	858
Average Recorded Investment, With a related allowance recorded	42	671
Interest Income Recognized, With no related allowance recorded	15	20
Interest Income Recognized, With a related allowance recorded	1	8
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,270	3,665	3,386
Recorded Investment, With a related allowance recorded	3	202	196
Unpaid Principal Balance, With no related allowance recorded	2,573	4,452	4,189
Unpaid Principal Balance, With a related allowance recorded	20	217	212
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	3	33	27
Average Recorded Investment, With no related allowance recorded	2,489	3,770
Average Recorded Investment, With a related allowance recorded	7	209
Interest Income Recognized, With no related allowance recorded	38	38
Interest Income Recognized, With a related allowance recorded	0	10
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,313	2,773	1,797
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	4,625	3,786	2,276
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	4,361	3,039
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	42	63
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	3,855	13,033	13,331
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	5,155	15,764	15,842
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	4,010	13,386
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	72	130
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	0	0
Recorded Investment, With a related allowance recorded	0	7,651	0
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	7,651	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	4	0
Average Recorded Investment, With no related allowance recorded	0	0
Average Recorded Investment, With a related allowance recorded	0	7,651
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	291
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	4,550	5,239	5,174
Recorded Investment, With a related allowance recorded	0	263	0
Unpaid Principal Balance, With no related allowance recorded	5,345	6,118	6,075
Unpaid Principal Balance, With a related allowance recorded	0	263	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	6	0
Average Recorded Investment, With no related allowance recorded	4,620	5,370
Average Recorded Investment, With a related allowance recorded	0	273
Interest Income Recognized, With no related allowance recorded	109	93
Interest Income Recognized, With a related allowance recorded	0	4
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	829	659	747
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With no related allowance recorded	1,091	722	747
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	1,035	695
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	1	24
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	356	838	853
Recorded Investment, With a related allowance recorded	387	12	0
Unpaid Principal Balance, With no related allowance recorded	571	1,409	1,423
Unpaid Principal Balance, With a related allowance recorded	394	12	0
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	83	12	$ 0
Average Recorded Investment, With no related allowance recorded	381	896
Average Recorded Investment, With a related allowance recorded	390	12
Interest Income Recognized, With no related allowance recorded	0	11
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

Loans and Lease Finance Recei50

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 10,045	$ 30,051	$ 10,045	$ 30,051
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	16,574	20,292	19,233	42,687
New modifications	0	759	3,143	1,877
Payoffs and payments, net	(10,839)	(2,584)	(13,826)	(26,097)
TDRs returned to accrual status	0	8,551	329	8,551
TDRs placed on nonaccrual status	0	0	(3,144)	0
Ending balance	5,735	27,018	5,735	27,018
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	4,391	12,029	1,626	12,622
New modifications	0	20	2,066	102
Charge-offs	0	0	0	(38)
Payoffs and payments, net	(81)	(465)	(2,197)	(1,102)
TDRs returned to accrual status	0	(8,551)	(329)	(8,551)
TDRs placed on nonaccrual status	0	0	3,144	0
Ending balance	$ 4,310	$ 3,033	$ 4,310	$ 3,033

Loans and Lease Finance Recei51

Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017Contract	Sep. 30, 2016USD ($)Contract	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	2	3	5
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 779	$ 5,209	$ 1,109
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		779	5,209	1,109
Troubled debt restructurings, Outstanding Recorded Investment		773	3,297	1,167
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 28
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 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	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 112
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	112
Troubled debt restructurings, Outstanding Recorded Investment		0	0	184
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0
Small Business Administration [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		1	0	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 20	$ 0	$ 214
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		20	0	214
Troubled debt restructurings, Outstanding Recorded Investment		14	0	202
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 28
Commercial Real Estate Owner Occupied [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 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		0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 3,143	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	3,143	0
Troubled debt restructurings, Outstanding Recorded Investment		0	3,143	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 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	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 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		1	0	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 759	$ 0	$ 759
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		759	0	759
Troubled debt restructurings, Outstanding Recorded Investment		759	0	759
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0
Dairy & Livestock and Agribusiness [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 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		0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 1,984	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	1,984	0
Troubled debt restructurings, Outstanding Recorded Investment		0	78	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0
Consumer [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Outstanding Recorded Investment		0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract		0	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		$ 0	$ 82	$ 24
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		0	82	24
Troubled debt restructurings, Outstanding Recorded Investment		0	76	22
Troubled debt restructurings, Financial Effect Resulting From Modifications		$ 0	$ 0	$ 0

Earnings Per Share Reconcilia52

Earnings Per Share Reconciliation - Additional Information (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per common share	15	299	10	281

Earnings Per Share Reconcilia53

Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings per common share:
Net earnings	$ 29,683	$ 25,448	$ 86,560	$ 74,353
Less: Net earnings allocated to restricted stock	107	98	325	305
Net earnings allocated to common shareholders	$ 29,576	$ 25,350	$ 86,235	$ 74,048
Weighted average shares outstanding	109,754	108,984	109,280	107,144
Basic earnings per common share	$ 0.27	$ 0.23	$ 0.79	$ 0.69
Diluted earnings per common share:
Net income allocated to common shareholders	$ 29,576	$ 25,350	$ 86,235	$ 74,048
Weighted average shares outstanding	109,754	108,984	109,280	107,144
Incremental shares from assumed exercise of outstanding options	365	386	392	403
Diluted weighted average shares outstanding	110,119	109,370	109,672	107,547
Diluted earnings per common share	$ 0.27	$ 0.23	$ 0.79	$ 0.69

Fair Value Information - Additi

Fair Value Information - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Fair Value Disclosures [Abstract]
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 Information - Assets

Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	$ 459,888	$ 608,811
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	4,819	5,783
Interest rate swaps, liabilities	4,819	5,783
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	2,180,467	2,276,249
Total liabilities	4,819	5,783
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	63,115	80,071
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] | Government Agency/GSE [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] | Government Agency/GSE [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	2,752
Fair Value on Recurring Basis [Member] | Government Agency/GSE [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	1,818,034	1,834,748
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	293,782	347,189
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	717	5,706
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	2,175,648	2,270,466
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	4,819	5,783
Interest rate swaps, liabilities	4,819	5,783
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	2,180,467	2,276,249
Total liabilities	4,819	5,783
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	63,115	80,071
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Government Agency/GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	0	2,752
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	1,818,034	1,834,748
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	293,782	347,189
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	717	5,706
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	2,175,648	2,270,466
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	4,819	5,783
Interest rate swaps, liabilities	$ 4,819	$ 5,783

Fair Value Information - Asse56

Fair Value Information - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value on Non-Recurring Basis [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Description of assets
Total assets	$ 83	$ 2,593
Other Real Estate Owned [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]
Description of assets
Total assets	0	2,558
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	0	8
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	0	27
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	83	0
Level 1 [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]
Description of assets
Total assets	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	0	0
Level 2 [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]
Description of assets
Total assets	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	0	0
Level 3 [Member]
Description of assets
Total assets	386	3,672
Level 3 [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	0	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]
Description of assets
Total assets	0	3,411
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	0	65
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	0	196
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	0	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	0	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	386	0
Carrying Value [Member]
Description of assets
Total assets	386	3,672
Carrying Value [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	0	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]
Description of assets
Total assets	0	3,411
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	0	65
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	0	196
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	0	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	0	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	$ 386	$ 0

Fair Value Information - Estima

Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Total cash and cash equivalents	$ 137,196	$ 119,445
Interest-earning balances due from depository institutions	20,521	47,848
FHLB stock	17,688	17,688
Investment securities available-for-sale	2,175,648	2,270,466
Investment securities held-to-maturity	848,382	911,676
Total loans, net of allowance for loan losses	4,685,793	4,333,524
Deposits:
Noninterest-bearing	3,908,809	3,673,541
Interest-bearing	2,699,287	2,636,139
Junior subordinated debentures	25,774	25,774
Swaps	459,888	608,811
Carrying Value [Member]
Assets
Total cash and cash equivalents	143,790	119,445
Interest-earning balances due from depository institutions	20,521	2,188
FHLB stock	17,688	17,688
Investment securities available-for-sale	2,175,648	2,270,466
Investment securities held-to-maturity	848,382	911,676
Total loans, net of allowance for loan losses	4,685,793	4,333,524
Swaps	4,819	5,783
Deposits:
Noninterest-bearing	3,908,809	3,673,541
Interest-bearing	2,699,287	2,636,139
Borrowings	518,069	656,028
Junior subordinated debentures	25,774	25,774
Swaps	4,819	5,783
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	143,790	119,445
Interest-earning balances due from depository institutions	20,567	2,188
FHLB stock	17,688	17,688
Investment securities available-for-sale	2,175,648	2,270,466
Investment securities held-to-maturity	842,050	897,374
Total loans, net of allowance for loan losses	4,619,896	4,306,225
Swaps	4,819	5,783
Deposits:
Noninterest-bearing	3,908,809	3,673,541
Interest-bearing	2,697,349	2,634,443
Borrowings	517,827	655,820
Junior subordinated debentures	18,260	18,463
Swaps	4,819	5,783
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	143,790	119,445
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	3,908,809	3,673,541
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	20,567	2,188
FHLB stock	17,688	17,688
Investment securities available-for-sale	2,175,648	2,270,466
Investment securities held-to-maturity	842,050	897,374
Total loans, net of allowance for loan losses	0	0
Swaps	4,819	5,783
Deposits:
Noninterest-bearing	0	0
Interest-bearing	2,697,349	2,634,443
Borrowings	517,827	655,820
Junior subordinated debentures	0	0
Swaps	4,819	5,783
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	4,619,896	4,306,225
Swaps	0	0
Deposits:
Noninterest-bearing	0	0
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	18,260	18,463
Swaps	$ 0	$ 0

Business Segments - Additional

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017LocationSegment
Segment Reporting [Abstract]
Number of principal reporting segments | Segment	2
Bank operated banking centers, number | Location	51

Business Segments - Schedule of

Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 71,739	$ 63,161	$ 207,655	$ 191,633
(Recapture of) provision for loan losses	(1,500)	(2,000)	(7,000)	(2,000)
Net interest income after (recapture of) provision for loan losses	73,239	65,161	214,655	193,633
Noninterest income	10,038	9,183	29,536	27,140
Noninterest expense	34,706	33,006	105,696	101,808
Earnings before income taxes	48,571	41,338	138,495	118,965
Goodwill	116,564	88,174	116,564	88,174	$ 89,533
Segment assets	8,304,012	8,044,993	8,304,012	8,044,993	$ 8,073,707
Operating Segments [Member] | Centers [Member]
Segment Reporting Information [Line Items]
Net interest income	50,539	45,499	144,879	132,316
(Recapture of) provision for loan losses	772	(1,164)	2,158	2,251
Net interest income after (recapture of) provision for loan losses	49,767	46,663	142,721	130,065
Noninterest income	5,764	5,182	16,274	15,335
Noninterest expense	12,963	12,423	38,607	37,924
Earnings before income taxes	42,568	39,422	120,388	107,476
Goodwill	116,564	88,174	116,564	88,174
Segment assets	7,166,356	6,945,214	7,166,356	6,945,214
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]
Segment Reporting Information [Line Items]
Net interest income	2,728	2,008	7,241	5,927
(Recapture of) provision for loan losses	(66)	1,089	(3,186)	(264)
Net interest income after (recapture of) provision for loan losses	2,794	919	10,427	6,191
Noninterest income	84	73	188	180
Noninterest expense	479	474	1,484	1,452
Earnings before income taxes	2,399	518	9,131	4,919
Goodwill	0	0	0	0
Segment assets	377,670	376,862	377,670	376,862
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net interest income	18,472	15,654	55,535	53,390
(Recapture of) provision for loan losses	(2,206)	(1,925)	(5,972)	(3,987)
Net interest income after (recapture of) provision for loan losses	20,678	17,579	61,507	57,377
Noninterest income	4,190	3,928	13,074	11,625
Noninterest expense	21,264	20,109	65,605	62,432
Earnings before income taxes	3,604	1,398	8,976	6,570
Goodwill	0	0	0	0
Segment assets	$ 759,986	$ 722,917	$ 759,986	$ 722,917

Derivative Financial Instrume60

Derivative Financial Instruments - Additional Information (Detail)	Sep. 30, 2017USD ($)Agreement	Dec. 31, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets and liabilities offset in balance sheet	$ 0
Total notional amount of the Company's swaps	$ 199,900,000	$ 202,700,000
Interest-rate Swap Agreements with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest-rate swap agreements | Agreement	77

Derivative Financial Instrume61

Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 4,819	$ 5,783
Other Liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	4,819	5,783
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	4,819	5,783
Other Assets [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4,819	$ 5,783

Derivative Financial Instrume62

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 198	$ 136	$ 592	$ 521
Interest Rate Swaps [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 198	$ 136	$ 592	$ 521

Other Comprehensive Income - Su

Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ 2,083	$ (4,006)	$ 6,128	$ 31,617
Net change in fair value recorded in accumulated OCI, Tax effect	875	(1,683)	2,574	13,279
Net change in fair value recorded in accumulated OCI, After-tax	1,208	(2,323)	3,554	18,338
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, Before-tax	(862)	297	(2,841)	(563)
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, Tax effect	(362)	125	(1,193)	(237)
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, After-tax	(500)	172	(1,648)	(326)
Net realized gain reclassified into earnings, Before-tax	0	(548)	(402)	(548)
Net realized gain reclassified into earnings, Tax Effect	0	(230)	(169)	(230)
Net realized gain reclassified into earnings, After-Tax	0	(318)	(233)	(318)
Net Change, Before-tax	1,221	(4,257)	2,885	30,506
Net Change, Tax effect	513	(1,788)	1,212	12,812
Other comprehensive income, net of tax	$ 708	$ (2,469)	$ 1,673	$ 17,694

Balance Sheet Offsetting - Sche

Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 460,778	$ 609,883
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(890)	(1,072)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	459,888	608,811
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	890	1,072
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(523,129)	(696,213)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(62,351)	(86,330)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	455,069	603,028
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	455,069	603,028
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	(510,351)	(683,413)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(55,282)	(80,385)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	4,819	5,783
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	4,819	5,783
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	4,819	5,783
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	4,819	5,783
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	4,819	5,783
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	4,819	5,783
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	5,709	6,855
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(890)	(1,072)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	4,819	5,783
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	890	1,072
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(12,778)	(12,800)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (7,069)	$ (5,945)