CVB Financial (CVBF) 10-Q 9 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
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		106,364,548

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 100,334	$ 95,030
Interest-earning balances due from Federal Reserve	207,893	10,738
Total cash and cash equivalents	308,227	105,768
Interest-earning balances due from depository institutions	33,189	27,118
Investment securities available-for-sale, at fair value (with amortized cost of $2,259,505 at September 30, 2015, and $3,083,582 at December 31, 2014)	2,312,721	3,137,158
Investment securities held-to-maturity (with fair value of $876,383 at September 30, 2015, and $2,177 at December 31, 2014)	869,650	1,528
Investment in stock of Federal Home Loan Bank (FHLB)	17,588	25,338
Loans and lease finance receivables	3,822,171	3,817,067
Allowance for loan losses	(59,149)	(59,825)
Net loans and lease finance receivables	3,763,022	3,757,242
Premises and equipment, net	31,797	33,591
Bank owned life insurance	130,076	126,927
Accrued interest receivable	22,769	23,194
Intangibles	2,487	3,214
Goodwill	74,244	74,244
Other real estate owned	7,003	5,637
Income taxes	30,402	31,461
Other assets	23,287	25,500
Total assets	7,626,462	7,377,920
Deposits:
Noninterest-bearing	3,304,967	2,866,365
Interest-bearing	2,654,505	2,738,293
Total deposits	5,959,472	5,604,658
Customer repurchase agreements	610,174	563,627
FHLB advances	0	199,479
Other borrowings	0	46,000
Accrued interest payable	273	1,161
Deferred compensation	11,100	10,291
Junior subordinated debentures	25,774	25,774
Payable for securities purchased	42,317	0
Other liabilities	56,625	48,821
Total liabilities	$ 6,705,735	$ 6,499,811
Commitments and Contingencies
Stockholders' Equity
Common stock, authorized, 225,000,000 shares without par; issued and outstanding 106,355,098 at September 30, 2015, and 105,893,216 at December 31, 2014	$ 502,102	$ 495,220
Retained earnings	384,072	351,814
Accumulated other comprehensive income, net of tax	34,553	31,075
Total stockholders' equity	920,727	878,109
Total liabilities and stockholders' equity	$ 7,626,462	$ 7,377,920

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Amortized cost	$ 2,259,505	$ 3,083,582
Fair Value, Held-to-maturity	$ 876,383	$ 2,177
Common stock, par value
Common stock, authorized	225,000,000	225,000,000
Common stock, shares issued	106,355,098	105,893,216
Common stock, shares outstanding	106,355,098	105,893,216

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income:
Loans and leases, including fees	$ 48,822	$ 46,923	$ 139,686	$ 135,137
Investment securities:
Investment securities available-for-sale	14,734	17,647	50,171	49,991
Investment securities held-to-maturity	3,436	40	3,510	125
Total investment income	18,170	17,687	53,681	50,116
Dividends from FHLB stock	509	518	2,392	1,648
Federal funds sold	167	112	496	363
Interest-earning deposits with other institutions	63	55	171	309
Total interest income	67,731	65,295	196,426	187,573
Interest expense:
Deposits	1,333	1,228	3,933	3,636
Borrowings	371	2,724	2,486	8,283
Junior subordinated debentures	110	105	323	315
Total interest expense	1,814	4,057	6,742	12,234
Net interest income before recapture of provision for loan losses	65,917	61,238	189,684	175,339
Recapture of provision for loan losses	(2,500)	(1,000)	(4,500)	(16,100)
Net interest income after recapture of provision for loan losses	68,417	62,238	194,184	191,439
Noninterest income:
Service charges on deposit accounts	3,930	4,065	11,843	11,798
Trust and investment services	2,275	2,045	6,607	6,103
Bankcard services	805	868	2,380	2,569
BOLI income	491	613	1,948	1,852
Gain on sale of loans held-for-sale	0	0	0	5,330
Decrease in FDIC loss sharing asset, net	0	(479)	(803)	(3,653)
Gain on OREO, net	158	127	414	262
Other	754	770	2,380	2,296
Total noninterest income	8,413	8,009	24,769	26,557
Noninterest expense:
Salaries and employee benefits	20,395	19,366	59,338	57,170
Occupancy and equipment	3,853	4,147	11,218	11,548
Professional services	1,937	2,080	4,617	5,090
Software licenses and maintenance	901	1,324	2,924	3,399
Promotion	1,297	1,349	3,825	3,956
Recapture of provision for unfunded loan commitments	0	(1,250)	(500)	(1,250)
Amortization of intangible assets	220	466	727	781
Debt termination expense	0	0	13,870	0
OREO expense	28	102	363	240
Acquisition related expenses	75	640	75	1,932
Other	4,036	4,257	12,290	12,096
Total noninterest expense	32,742	32,481	108,747	94,962
Earnings before income taxes	44,088	37,766	110,206	123,034
Income taxes	16,202	13,471	39,674	44,594
Net earnings	27,886	24,295	70,532	78,440
Other comprehensive income:
Unrealized gain/(loss) on securities arising during the period	18,674	(10,291)	5,974	47,272
Less: Reclassification adjustment for net loss on securities included in net income	22	0	22	0
Other comprehensive income (loss), before tax	18,696	(10,291)	5,996	47,272
Less: Income tax benefit (expense) related to items of other comprehensive income (loss)	(7,852)	4,322	(2,518)	(19,854)
Other comprehensive income (loss), net of tax	10,844	(5,969)	3,478	27,418
Comprehensive income	$ 38,730	$ 18,326	$ 74,010	$ 105,858
Basic earnings per common share	$ 0.26	$ 0.23	$ 0.66	$ 0.74
Diluted earnings per common share	0.26	0.23	0.66	0.74
Cash dividends declared per common share	$ 0.12	$ 0.10	$ 0.36	$ 0.30

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2013	$ 771,887	$ 491,068	$ 290,149	$ (9,330)
Beginning balance, shares at Dec. 31, 2013		105,370
Repurchase of common stock	(5,383)	$ (5,383)
Repurchase of common stock, shares		(377)
Exercise of stock options	5,378	$ 5,378
Exercise of stock options, shares		498
Tax benefit from exercise of stock options	983	$ 983
Shares issued pursuant to stock-based compensation plan	2,277	$ 2,277
Shares issued pursuant to stock-based compensation plan, shares		306
Cash dividends declared on common stock	(31,769)		(31,769)
Net earnings	78,440		78,440
Other comprehensive income	27,418			27,418
Ending balance at Sep. 30, 2014	849,231	$ 494,323	336,820	18,088
Ending balance, shares at Sep. 30, 2014		105,797
Beginning balance at Dec. 31, 2014	878,109	$ 495,220	351,814	31,075
Beginning balance, shares at Dec. 31, 2014		105,893
Repurchase of common stock	(606)	$ (606)
Repurchase of common stock, shares		(41)
Exercise of stock options	4,672	$ 4,672
Exercise of stock options, shares		411
Tax benefit from exercise of stock options	772	$ 772
Shares issued pursuant to stock-based compensation plan	2,044	$ 2,044
Shares issued pursuant to stock-based compensation plan, shares		92
Cash dividends declared on common stock	(38,274)		(38,274)
Net earnings	70,532		70,532
Other comprehensive income	3,478			3,478
Ending balance at Sep. 30, 2015	$ 920,727	$ 502,102	$ 384,072	$ 34,553
Ending balance, shares at Sep. 30, 2015		106,355

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends per common share	$ 0.12	$ 0.10	$ 0.36	$ 0.30

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities
Interest and dividends received	$ 208,549	$ 193,605
Service charges and other fees received	21,604	22,653
Interest paid	(7,631)	(12,120)
Net cash paid to vendors, employees and others	(98,692)	(92,766)
Income taxes paid	(38,000)	(44,000)
Payments to FDIC, loss share agreement	(460)	(1,186)
Net cash provided by operating activities	85,370	66,186
Cash Flows from Investing Activities
Proceeds from redemption of FHLB stock	7,750	10,413
Net change in interest-earning balances from depository institutions	(6,071)	62,491
Proceeds from sale of investment securities available-for-sale	975	14,271
Proceeds from repayment of investment securities available-for-sale	300,959	238,495
Proceeds from maturity of investment securities available-for-sale	83,322	63,216
Purchases of investment securities available-for-sale	(431,650)	(738,882)
Proceeds from repayment of investment securities held-to-maturity	13,177	0
Proceeds from maturity of investment securities held-to-maturity	20,550	0
Net decrease in loan and lease finance receivables	2,647	101,432
Proceeds from sales of premises and equipment	0	663
Purchase of premises and equipment	(1,249)	(1,668)
Proceeds from sales of other real estate owned	2,579	2,588
Cash acquired on purchase of American Security Bank, net of cash paid	0	50,038
Net cash used in investing activities	(7,011)	(196,943)
Cash Flows from Financing Activities
Net increase in other deposits	416,830	492,720
Net decrease in time deposits	(62,016)	(2,433)
Repayment of FHLB advances	(200,000)	0
Net decrease in other borrowings	(46,000)	(69,000)
Net increase (decrease) in customer repurchase agreements	46,547	(114,427)
Cash dividends on common stock	(36,099)	(31,718)
Repurchase of common stock	(606)	(5,383)
Proceeds from exercise of stock options	4,672	5,378
Tax benefit related to exercise of stock options	772	983
Net cash provided by financing activities	124,100	276,120
Net increase in cash and cash equivalents	202,459	145,363
Cash and cash equivalents, beginning of period	105,768	94,693
Cash and cash equivalents, end of period	308,227	240,056
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities
Net earnings	70,532	78,440
Adjustments to reconcile net earnings to net cash provided by operating activities:
Gain on sale of loans held-for-sale	0	(5,330)
Loss on sale of investment securities	22	0
Loss on sale of premises and equipment, net	154	68
Gain on sale of other real estate owned	(386)	(222)
Amortization of capitalized prepayment penalty on borrowings	521	204
Increase in bank owned life insurance	(3,149)	(1,757)
Net amortization of premiums and discounts on investment securities	14,605	15,515
Accretion of SJB discount	(3,010)	(4,546)
Recapture of provision for loan losses	(4,500)	(16,100)
Recapture of provision for unfunded loan commitments	(500)	(1,250)
Valuation adjustment on other real estate owned	162	65
Change in FDIC loss share asset	299	3,653
Payments to FDIC, loss share agreement	(460)	(1,186)
Stock-based compensation	2,044	2,277
Depreciation and amortization, net	(701)	488
Change in accrued interest receivable	425	(684)
Change in accrued interest payable	(888)	(36)
Change in other assets and liabilities	10,200	(3,413)
Total adjustments	14,838	(12,254)
Net cash provided by operating activities	85,370	66,186
Net cash provided by investing activities	(7,011)	(196,943)
Net cash provided by financing activities	124,100	276,120
Net increase in cash and cash equivalents	202,459	145,363
Supplemental Disclosure of Non-cash Investing Activities
Securities purchased and not settled	42,317	643
Transfer of loans to other real estate owned	3,721	640
Transfer of AFS securities to HTM securities	$ 898,598	$ 0

Business

Business	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	1. BUSINESS The condensed consolidated financial statements include the accounts of 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 ASC 810 Consolidation, this trust does not meet the criteria for consolidation. The Company’s primary operations are related to traditional banking activities. This includes the acceptance of deposits and the lending and investing of money through the operations of the Bank. The Bank also provides trust and investment-related services to customers through its CitizensTrust Division. The Bank’s customers consist primarily of small to mid-sized businesses and individuals located in San Bernardino County, Riverside County, Los Angeles County, Orange County, Ventura County, San Diego County, Madera County, Fresno County, Tulare County, and Kern County, California. The Bank operates 40 Business Financial Centers, seven Commercial Banking Centers, and three trust offices. The Company intends to open a new Commercial Banking Center in Santa Barbara in the fourth quarter of 2015. The Company is headquartered in the city of Ontario, California. On October 14, 2015, we announced that we have entered into a merger agreement with County Commerce Bank, pursuant to which County Commerce Bank will merge into Citizens Business Bank when the transaction closes. County Commerce Bank is headquartered in Ventura County with four branch locations in Ventura and Santa Barbara Counties and total assets of approximately $250 million. This acquisition would extend our geographic footprint northward into the central coast of California. We expect to close this announced acquisition in the first quarter of 2016, subject to regulatory and County Commerce Bank shareholders’ approvals.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	2. BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements and notes thereto have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results for the full year. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements, accounting policies and financial notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014, filed with the SEC. A summary of the significant accounting policies consistently applied in the preparation of the accompanying unaudited condensed consolidated financial statements follows. Reclassification

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [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, Use of Estimates in the Preparation of Financial Statements Recent Accounting Pronouncements In September 2015, the FASB issued ASU 2015-16, which eliminates the requirement for an acquirer to retrospectively adjust the financial statement for measurement-period adjustments that occur in periods after a business combination is consummated. ASU 2015-16 will be effective for the first interim period within annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s consolidated financial statements.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	4. INVESTMENT SECURITIES The amortized cost and estimated fair value of investment securities are summarized below. The majority of securities held are publicly traded, and the estimated fair values were obtained from an independent pricing service based upon market quotes. September 30, 2015 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSEs $ 20,753 $ 16 $ (1 ) $ 20,768 0.90 % Residential mortgage-backed securities 1,670,643 40,902 - 1,711,545 74.00 % CMOs/REMICs - residential 380,260 8,237 - 388,497 16.80 % Municipal bonds 182,849 4,049 - 186,898 8.08 % Other securities 5,000 13 - 5,013 0.22 % Total available-for-sale securities $ 2,259,505 $ 53,217 $ (1 ) $ 2,312,721 100.00 % Investment securities held-to-maturity (1): Government agency/GSEs $ 297,204 $ 3,321 $ - $ 300,525 34.18 % Residential mortgage-backed securities 238,993 1,384 - 240,377 27.48 % CMO 1,348 589 - 1,937 0.15 % Municipal bonds 332,105 1,635 (196 ) 333,544 38.19 % Total held-to-maturity securities $ 869,650 $ 6,929 $ (196 ) $ 876,383 100.00 % December 31, 2014 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSEs $ 339,071 $ - $ (8,228 ) $ 330,843 10.55% Residential mortgage-backed securities 1,884,370 36,154 (3,028 ) 1,917,496 61.12% CMOs/REMICs - residential 297,318 7,050 (277 ) 304,091 9.69% Municipal bonds 557,823 22,463 (645 ) 579,641 18.48% Other securities 5,000 87 - 5,087 0.16% Total available-for-sale securities $ 3,083,582 $ 65,754 $ (12,178 ) $ 3,137,158 100.00% Investment securities held-to-maturity (1): CMO $ 1,528 $ 649 $ - $ 2,177 100.00% Total held-to-maturity securities $ 1,528 $ 649 $ - $ 2,177 100.00% (1) Securities held-to-maturity are presented in the condensed consolidated balance sheets at amortized cost. During the quarter ended September 30, 2015, investment securities were transferred from the available-for-sale security portfolio to the held-to-maturity security portfolio. Transfers of securities into the held-to-maturity category from the available-for-sale category are transferred at fair value at the date of transfer. The fair value of these securities at the date of transfer was $898.6 million. The unrealized holding gain or loss at the date of transfer is retained in accumulated other comprehensive income (“AOCI”) and in the carrying value of the held-to-maturity securities. The net unrealized holding gain at the date of transfer was $3.9 million after-tax and will continue to be reported in AOCI and amortized over the remaining life of the securities as a yield adjustment. 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 2015 2014 2015 2014 (Dollars in thousands) Investment securities available-for-sale: Taxable $ 11,840 $ 12,420 $ 37,548 $ 34,300 Tax-advantaged 2,894 5,227 12,623 15,691 Investment securities held-to-maturity: Taxable 1,688 40 1,762 125 Tax-advantaged 1,748 - 1,748 - Total interest income from investment securities $ 18,170 $ 17,687 $ 53,681 $ 50,116 Approximately 84% of the total investment securities portfolio at September 30, 2015 represent 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 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, 2015 and December 31, 2014. Management has reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. September 30, 2015 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: Government agency/GSEs $ 9,000 $ 1 $ - $ - $ 9,000 $ 1 Residential mortgage-backed securities - - - - - - CMOs/REMICs - residential - - - - - - Municipal bonds - - - - - - Other securities - - - - - - Total available-for-sale securities $ 9,000 $ 1 $ - $ - $ 9,000 $ 1 Investment securities held-to-maturity: Government agency/GSEs $ - $ - $ - $ - $ - $ - Residential mortgage-backed securities - - - - - - CMO - - - - - - Municipal bonds 81,956 196 - - 81,956 196 Other securities - - - - - - Total held-to-maturity securities $ 81,956 $ 196 $ - $ - $ 81,956 $ 196 December 31, 2014 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: Government agency/GSEs $ 22,224 $ 28 $ 307,873 $ 8,200 $ 330,097 $ 8,228 Residential mortgage-backed securities 19,636 4 145,681 3,024 165,317 3,028 CMOs/REMICs - residential - - 31,143 277 31,143 277 Municipal bonds 1,953 23 24,812 622 26,765 645 Other securities - - - - - - Total available-for-sale securities $ 43,813 $ 55 $ 509,509 $ 12,123 $ 553,322 $ 12,178 The following summarizes our analysis of these securities and the unrealized losses. This assessment was based on the following factors: i) the length of the time and the extent to which the fair value has been less than amortized cost; ii) adverse condition specifically related to the security, an industry, or a geographic area and whether or not the Company expects to recover the entire amortized cost, iii) historical and implied volatility of the fair value of the security; iv) the payment structure of the security and the likelihood of the issuer being able to make payments in the future; v) failure of the issuer of the security to make scheduled interest or principal payments, vi) any changes to the rating of the security by a rating agency, and vii) recoveries or additional declines in fair value subsequent to the balance sheet date. Government Agency & Government-Sponsored Enterprise (“GSE”) — Mortgage-Backed Securities(“MBS”) and CMOs/REMICs— Municipal Bonds On an ongoing basis, we monitor the quality of our municipal bond portfolio in light of the current financial problems exhibited by certain monoline insurance companies. Many of the securities that would not be rated without insurance are pre-refunded and/or are general obligation bonds. We continue to monitor municipalities, which includes a review of the respective municipalities’ audited financial statements to determine whether there are any audit or performance issues. We use outside brokers to assist us in these analyses. Based on our monitoring of the municipal marketplace, to our knowledge, none of the municipalities are exhibiting financial problems that would lead us to believe that there is OTTI for any given security. At September 30, 2015 and December 31, 2014, investment securities having a carrying value of approximately $2.81 billion and $3.11 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, 2015, by contractual maturity, are shown in the table below. Although mortgage-backed securities and CMOs/REMICs have contractual maturities through 2043, expected maturities will differ from contractual maturities because borrowers may have the right to prepay such obligations without penalty. Mortgage-backed securities and CMOs/REMICs are included in maturity categories based upon estimated prepayment speeds. September 30, 2015 Available-for-sale Held-to-maturity Amortized Fair Amortized Fair (Dollars in thousands) Due in one year or less $ 91,512 $ 92,781 $ 124,536 $ 125,460 Due after one year through five years 1,894,584 1,939,712 139,716 141,134 Due after five years through ten years 118,633 121,282 554,537 558,832 Due after ten years 154,776 158,946 50,861 50,957 Total investment securities $ 2,259,505 $ 2,312,721 $ 869,650 $ 876,383 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 for the nine months ended September 30, 2015.

Acquired SJB Assets and FDIC Lo

Acquired SJB Assets and FDIC Loss Sharing Asset	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Acquired SJB Assets and FDIC Loss Sharing Asset	5. 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 At September 30, 2015, the remaining discount associated with the PCI loans approximated $4.8 million. Based on the Company’s regular forecast of expected cash flows from these loans, approximately $2.8 million of the related discount is expected to accrete into interest income over the remaining average lives of the respective pools and individual loans, which approximates 3.2 years and 0.9 years, respectively. The loss sharing agreement for commercial loans expired October 16, 2014. The following table provides a summary of PCI loans and lease finance receivables by type and their credit quality indicators for the periods indicated. September 30, 2015 December 31, 2014 (Dollars in thousands) Commercial and industrial $ 8,062 $ 14,605 SBA 414 1,110 Real estate: Commercial real estate 87,522 109,350 Construction - - SFR mortgage 198 205 Dairy & livestock and agribusiness 523 4,890 Municipal lease finance receivables - - Consumer and other loans 2,466 3,336 Gross PCI loans 99,185 133,496 Less: Purchase accounting discount (4,754 ) (7,129 ) Gross PCI loans, net of discount 94,431 126,367 Less: Allowance for PCI loans losses - - Net PCI loans $ 94,431 $ 126,367 Credit Quality Indicators The following table summarizes PCI loans by internal risk ratings for the periods indicated. September 30, 2015 December 31, 2014 (Dollars in thousands) Pass $ 22,108 $ 26,706 Watch list 57,308 77,371 Special mention 13,379 8,203 Substandard 6,390 21,216 Doubtful & loss - - Total PCI gross loans $ 99,185 $ 133,496 Allowance for Loan Losses (“ALLL”) The Company’s Credit Management Division is responsible for regularly reviewing the ALLL methodology for PCI loans. The ALLL for PCI loans is determined separately from total loans, and is based on expectations of future cash flows from the underlying pools of loans or individual loans in accordance with ASC 310-30, as more fully described in Note 3— Summary of Significant Accounting Policies

Loans and Lease Finance Receiva

Loans and Lease Finance Receivables and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans and Lease Finance Receivables and Allowance for Loan Losses	6. 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, 2015 December 31, 2014 (Dollars in thousands) Commercial and industrial $ 413,709 $ 390,011 SBA 116,126 134,265 Real estate: Commercial real estate 2,569,128 2,487,803 Construction 57,578 55,173 SFR mortgage 221,696 205,124 Dairy & livestock and agribusiness 212,670 279,173 Municipal lease finance receivables 75,839 77,834 Consumer and other loans 69,630 69,884 Gross loans, excluding PCI loans 3,736,376 3,699,267 Less: Deferred loan fees, net (8,636 ) (8,567 ) Gross loans, excluding PCI loans, net of deferred loan fees 3,727,740 3,690,700 Less: Allowance for loan losses (59,149 ) (59,825 ) Net loans, excluding PCI loans 3,668,591 3,630,875 PCI Loans 99,185 133,496 Discount on PCI loans (4,754 ) (7,129 ) PCI loans, net 94,431 126,367 Total loans and lease finance receivables $ 3,763,022 $ 3,757,242 As of September 30, 2015, 68.76% of the total gross loan portfolio (excluding PCI loans) consisted of commercial real estate loans and 1.54% of the total loan portfolio consisted of construction 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, 2015, $171.0 million, or 6.66% of the total commercial real estate loans included loans secured by farmland, compared to $165.6 million, or 6.66%, at December 31, 2014. The loans secured by farmland included $132.8 million for loans secured by dairy & livestock land and $38.2 million for loans secured by agricultural land at September 30, 2015, compared to $144.1 million for loans secured by dairy & livestock land and $21.5 million for loans secured by agricultural land at December 31, 2014. As of September 30, 2015, dairy & livestock and agribusiness loans of $212.7 million was comprised of $197.9 million for dairy & livestock loans and $14.8 million for agribusiness loans, compared to $268.1 million for dairy & livestock loans and $11.1 million for agribusiness loans at December 31, 2014. At September 30, 2015, the Company held approximately $1.84 billion of total fixed rate loans. At September 30, 2015 and December 31, 2014, loans totaling $2.89 billion and $2.78 billion, respectively, were pledged to secure borrowings and available lines of credit from the FHLB and the Federal Reserve Bank. Credit Quality Indicators Central to our credit risk management is our loan risk rating system. The originating credit 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, Pass Watch List, 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 range from minimal credit risk to lower than average, but still acceptable, credit risk. Pass Watch List — Pass Watch list loans usually require more than normal management attention. Loans which qualify for the Pass 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 are currently protected but are weak. Although concerns exist, the Company is currently protected and loss is unlikely. Such loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s credit position at some future date. Substandard – Loans classified as substandard include poor liquidity, high leverage, and erratic earnings or losses. The primary source of repayment is no longer realistic, and asset or collateral liquidation may be the only source of repayment. Substandard loans are marginal and require continuing and close supervision by credit management. Substandard loans have the distinct possibility that the Company will sustain some loss if deficiencies are not corrected. Doubtful – Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added provision that the weaknesses make collection or the liquidation, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The possibility of loss is extremely high, but because of certain important and reasonable specific pending factors which may work to the advantage and strengthening of the assets, their classifications as losses are deferred until their more exact status may be determined. Loss — Loans classified as loss are considered uncollectible and of such little value that their continuance as active assets of the Company 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 basically worthless asset even though partial recovery may be achieved in the future. The following tables summarize each class of loans, excluding PCI loans, according to our internal risk ratings for the periods presented. September 30, 2015 Pass Watch List Special Mention Substandard Doubtful & Loss Total (Dollars in thousands) Commercial and industrial $ 278,042 $ 95,419 $ 36,338 $ 3,668 $ 242 $ 413,709 SBA 72,280 22,218 13,648 6,531 1,449 116,126 Real estate: Commercial real estate Owner occupied 613,734 145,354 50,171 13,560 - 822,819 Non-owner occupied 1,462,203 216,513 27,413 40,180 - 1,746,309 Construction Speculative 28,962 6,302 - 7,651 - 42,915 Non-speculative 14,663 - - - - 14,663 SFR mortgage 194,265 20,104 4,241 3,086 - 221,696 Dairy & livestock and agribusiness 88,147 112,419 12,104 - - 212,670 Municipal lease finance receivables 46,084 24,787 4,968 - - 75,839 Consumer and other loans 53,327 11,797 1,667 2,748 91 69,630 Total gross loans, excluding PCI loans $ 2,851,707 $ 654,913 $ 150,550 $ 77,424 $ 1,782 $ 3,736,376 December 31, 2014 Pass Watch List Special Mention Substandard Doubtful & Loss Total (Dollars in thousands) Commercial and industrial $ 234,029 $ 105,904 $ 33,795 $ 16,031 $ 252 $ 390,011 SBA 84,769 24,124 15,858 7,920 1,594 134,265 Real estate: Commercial real estate Owner occupied 552,072 159,908 46,248 32,139 - 790,367 Non-owner occupied 1,347,006 241,809 56,353 52,268 - 1,697,436 Construction Speculative 28,310 613 - 7,651 - 36,574 Non-speculative 18,071 528 - - - 18,599 SFR mortgage 174,311 20,218 2,442 8,153 - 205,124 Dairy & livestock and agribusiness 174,783 85,660 8,612 10,015 103 279,173 Municipal lease finance receivables 35,463 22,349 20,022 - - 77,834 Consumer and other loans 62,904 2,233 1,789 2,763 195 69,884 Total gross loans, excluding PCI loans $ 2,711,718 $ 663,346 $ 185,119 $ 136,940 $ 2,144 $ 3,699,267 Allowance for Loan Losses The Company’s Credit Management Division is responsible for regularly reviewing the allowance for loan losses methodology, including loss factors and economic risk factors. The Bank’s Director Loan Committee provides 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 of the 2014 Annual Report on Form 10-K for a more detailed discussion concerning the allowance for loan losses. Management believes that the ALLL was appropriate at September 30, 2015 and December 31, 2014. No assurance can be given that economic conditions which adversely affect the Company’s service areas or other circumstances will not be reflected in increased provisions for loan losses in the future. The following tables present the balance and activity related to the allowance for loan losses for held-for-investment loans, by portfolio segment for the periods presented. For the Three Months Ended September 30, 2015 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 7,185 $ (82 ) $ 50 $ (620 ) $ 6,533 SBA 2,085 - 2 (122 ) 1,965 Real estate: Commercial real estate 35,414 (10 ) 2,018 (2,811 ) 34,611 Construction 746 - 8 119 873 SFR mortgage 2,564 - - 75 2,639 Dairy & livestock and agribusiness 3,974 - 98 796 4,868 Municipal lease finance receivables 1,014 - - 17 1,031 Consumer and other loans 834 - 11 (16 ) 829 Unallocated 5,738 - - 62 5,800 Total allowance for loan losses $ 59,554 $ (92 ) $ 2,187 $ (2,500 ) $ 59,149 For the Three Months Ended September 30, 2014 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 6,037 $ (2 ) $ 187 $ 1,254 $ 7,476 SBA 2,365 - - (1,157 ) 1,208 Real estate: Commercial real estate 35,918 - 2 (286 ) 35,634 Construction 605 - 37 148 790 SFR mortgage 2,214 - 188 (97 ) 2,305 Dairy & livestock and agribusiness 5,428 (1,061 ) 151 (241 ) 4,277 Municipal lease finance receivables 1,464 - - 4 1,468 Consumer and other loans 930 (7 ) 113 (169 ) 867 Unallocated 6,013 - - (456 ) 5,557 Total allowance for loan losses $ 60,974 $ (1,070 ) $ 678 $ (1,000 ) $ 59,582 For the Nine Months Ended September 30, 2015 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 7,074 $ (216 ) $ 282 $ (607 ) $ 6,533 SBA 2,557 (33 ) 39 (598 ) 1,965 Real estate: Commercial real estate 33,373 (117 ) 3,658 (2,303 ) 34,611 Construction 988 - 58 (173 ) 873 SFR mortgage 2,344 (215 ) 185 325 2,639 Dairy & livestock and agribusiness 5,479 - 308 (919 ) 4,868 Municipal lease finance receivables 1,412 - - (381 ) 1,031 Consumer and other loans 1,262 (197 ) 72 (308 ) 829 Unallocated 5,336 - - 464 5,800 Total allowance for loan losses $ 59,825 $ (778 ) $ 4,602 $ (4,500 ) $ 59,149 For the Nine Months Ended September 30, 2014 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 8,502 $ (556 ) $ 685 $ (1,155 ) $ 7,476 SBA 2,332 - 63 (1,187 ) 1,208 Real estate: Commercial real estate 39,402 (352 ) 140 (3,556 ) 35,634 Construction 1,305 - 834 (1,349 ) 790 SFR mortgage 2,718 - 188 (601 ) 2,305 Dairy & livestock and agribusiness 11,728 (1,061 ) 393 (6,783 ) 4,277 Municipal lease finance receivables 2,335 - - (867 ) 1,468 Consumer and other loans 960 (26 ) 139 (206 ) 867 Unallocated 5,953 - - (396 ) 5,557 Total allowance for loan losses $ 75,235 $ (1,995 ) $ 2,442 $ (16,100 ) $ 59,582 The following tables present the recorded investment in loans held-for-investment, excluding PCI loans, and the related allowance for loan losses by portfolio segment, based on the Company’s methodology for determining the allowance for loan losses for the periods presented. September 30, 2015 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Individually Collectively (Dollars in thousands) Commercial and industrial $ 1,687 $ 412,022 $ 607 $ 5,926 SBA 3,319 112,807 4 1,961 Real estate: Commercial real estate 43,647 2,525,481 - 34,611 Construction 7,651 49,927 23 850 SFR mortgage 6,389 215,307 22 2,617 Dairy & livestock and agribusiness 5,262 207,408 - 4,868 Municipal lease finance receivables - 75,839 - 1,031 Consumer and other loans 906 68,724 6 823 Unallocated - - - 5,800 Total $ 68,861 $ 3,667,515 $ 662 $ 58,487 September 30, 2014 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Individually Collectively (Dollars in thousands) Commercial and industrial $ 4,467 $ 376,009 $ 652 $ 6,824 SBA 3,242 129,926 59 1,149 Real estate: Commercial real estate 31,375 2,434,540 - 35,634 Construction 26,419 40,810 - 790 SFR mortgage 7,755 185,450 39 2,266 Dairy & livestock and agribusiness 18,939 173,991 - 4,277 Municipal lease finance receivables - 80,013 - 1,468 Consumer and other loans 461 69,350 4 863 Unallocated - - - 5,557 Total $ 92,658 $ 3,490,089 $ 754 $ 58,828 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 appropriateness 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 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 dependent restructured loans are measured by comparing the present value of expected future cash flows on the restructured loans discounted at the interest rate of the original loan agreement to the loan’s carrying value. These impairment reserves are recognized as a specific component to be provided for in the allowance for loan losses. Generally, when loans are identified as impaired they are moved to our Special Assets Department. When we identify a loan as impaired, we measure the loan for potential impairment using discounted cash flows, unless the loan is determined to be collateral dependent. In these cases, we use the current fair value of collateral, less selling costs. Generally, the determination of fair value is established through obtaining external appraisals of the collateral. The following tables present the recorded investment in the aging of, past due and nonaccrual loans, excluding PCI loans, by type of loans for the periods presented. September 30, 2015 30-59 60-89 Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ - $ - $ - $ 1,051 $ 412,658 $ 413,709 SBA - - - 2,634 113,492 116,126 Real estate: Commercial real estate Owner occupied - - - 4,279 818,540 822,819 Non-owner occupied 266 - 266 12,417 1,733,626 1,746,309 Construction - Speculative (2) - - - - 42,915 42,915 Non-speculative - - - - 14,663 14,663 SFR mortgage - - - 2,778 218,918 221,696 Dairy & livestock and agribusiness - - - - 212,670 212,670 Municipal lease finance receivables - - - - 75,839 75,839 Consumer and other loans 52 - 52 489 69,089 69,630 Total gross loans, excluding PCI Loans $ 318 $ - $ 318 $ 23,648 $ 3,712,410 $ 3,736,376 (1) As of September 30, 2015, $19.1 million of nonaccruing loans were current, $371,000 were 30-59 days past due, $2.3 million were 60-89 days (2) Speculative construction loans are generally for properties where there is no identified buyer or renter. December 31, 2014 30-59 60-89 Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ 943 $ 35 $ 978 $ 2,308 $ 386,725 $ 390,011 SBA 75 - 75 2,481 131,709 134,265 Real estate: Commercial real estate Owner occupied 36 86 122 4,072 786,173 790,367 Non-owner occupied - - - 19,246 1,678,190 1,697,436 Construction Speculative - - - - 36,574 36,574 Non-speculative - - - - 18,599 18,599 SFR mortgage 425 - 425 3,240 201,459 205,124 Dairy & livestock and agribusiness - - - 103 279,070 279,173 Municipal lease finance receivables - - - - 77,834 77,834 Consumer and other loans 64 17 81 736 69,067 69,884 Total gross loans, excluding PCI Loans $ 1,543 $ 138 $ 1,681 $ 32,186 $ 3,665,400 $ 3,699,267 (1) As of December 31, 2014, $20.1 million of nonaccruing loans were current, $3.7 million were 30-59 days past due, $8.5 million were 90+ days past due. Impaired Loans At September 30, 2015, the Company had impaired loans, excluding PCI loans, of $68.9 million. Of this amount, there were $16.7 million of nonaccrual commercial real estate loans, $2.8 million of nonaccrual SFR mortgage loans, $2.6 million of nonaccrual SBA loans, $1.1 million of nonaccrual commercial and industrial loans and $489,000 of nonaccrual consumer and other loans. These impaired loans included $60.4 million of loans whose terms were modified in a troubled debt restructuring, of which $15.2 million were classified as nonaccrual. The remaining balance of $45.2 million consisted of 32 loans performing according to the restructured terms. The impaired loans had a specific allowance of $662,000 at September 30, 2015. At December 31, 2014, the Company had classified as impaired loans, excluding PCI loans, with a balance of $85.8 million with a related allowance of $1.5 million. The following tables present information for held-for-investment loans, excluding PCI loans, individually evaluated for impairment by class of loans, as of and for the periods indicated below. As of and For the Nine Months Ended September 30, 2015 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 1,067 $ 1,926 $ - $ 1,166 $ 23 SBA 3,273 3,911 - 3,385 39 Real estate: Commercial real estate Owner occupied 7,665 8,806 - 7,935 178 Non-owner occupied 35,982 40,591 - 36,490 1,338 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 5,788 6,739 - 6,392 82 Dairy & livestock and agribusiness 5,262 5,650 - 5,569 180 Municipal lease finance receivables - - - - - Consumer and other loans 852 1,379 - 881 12 Total 59,889 69,002 - 61,818 1,852 With a related allowance recorded: Commercial and industrial 620 694 607 637 - SBA 46 47 4 58 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner occupied - - - - - Construction Speculative 7,651 7,651 23 7,651 290 Non-speculative - - - - - SFR mortgage 601 653 22 612 9 Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 54 59 6 56 - Total 8,972 9,104 662 9,014 299 Total impaired loans $ 68,861 $ 78,106 $ 662 $ 70,832 $ 2,151 As of and For the Nine Months Ended September 30, 2014 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 2,913 $ 3,954 $ - $ 2,912 $ 44 SBA 3,183 3,907 - 2,937 - Real estate: Commercial real estate Owner occupied 8,742 9,896 - 9,025 238 Non-owner occupied 22,633 29,545 - 23,252 541 Construction Speculative 17,318 18,407 - 17,440 232 Non-speculative 9,101 9,101 - 9,145 463 SFR mortgage 7,285 9,685 - 7,934 82 Dairy & livestock and agribusiness 18,939 20,698 - 21,205 819 Municipal lease finance receivables - - - - - Consumer and other loans 450 876 - 455 - Total 90,564 106,069 - 94,305 2,419 With a related allowance recorded: Commercial and industrial 1,554 1,882 652 1,560 - SBA 59 69 59 66 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner occupied - - - - - Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 470 484 39 476 - Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 11 15 4 12 - Total 2,094 2,450 754 2,114 - Total impaired loans $ 92,658 $ 108,519 $ 754 $ 96,419 $ 2,419 As of December 31, 2014 Recorded Unpaid Related (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 2,391 $ 3,624 $ - SBA 1,853 2,197 - Real estate: Commercial real estate Owner occupied 16,961 18,166 - Non-owner occupied 30,068 38,156 - Construction Speculative 7,651 7,651 - Non-speculative - - - SFR mortgage 6,512 7,493 - Dairy & livestock and agribusiness 15,796 17,587 - Municipal lease finance receivables - - - Consumer and other loans 673 1,094 - Total 81,905 95,968 - With a related allowance recorded: Commercial and industrial 629 698 615 SBA 1,327 1,591 296 Real estate: Commercial real estate Owner occupied - - - Non-owner occupied 982 1,278 154 Construction Speculative - - - Non-speculative - - - SFR mortgage 467 484 35 Dairy & livestock and agribusiness - - - Municipal lease finance receivables - - - Consumer and other loans 482 508 449 Total 3,887 4,559 1,549 Total impaired loans $ 85,792 $ 100,527 $ 1,549 The Company recognizes the charge-off of the impairment allowance on impaired loans in the period in which a loss is identified for collateral dependent loans. Therefore, the majority of the nonaccrual loans as of September 30, 2015 and December 31, 2014 have already been written down to the estimated net realizable value. The impaired loans with a related allowance recorded are on nonaccrual loans where a charge-off is not yet processed, on nonaccrual SFR loans where there is a potential modification in process, or on smaller balance non-collateral-dependent loans. Reserve for Unfunded Loan Commitments The allowance for off-balance sheet credit exposure relates to commitments to extend credit, letters of credit and undisbursed funds on lines of credit. The Company evaluates credit risk associated with the off-balance sheet commitments at the same time it evaluates credit risk associated with the loan and lease portfolio. The Company recorded zero provision for unfunded loan commitments for the three months ended September 30, 2015, compared to a $1.3 million recapture of provision for unfunded commitments for the same period in 2014. A $500,000 recapture of provision for unfunded loan commitments was recorded for the nine months ended September 30, 2015, compared to a $1.3 million recapture of provision for unfunded commitments for the same period of 2014. At September 30, 2015 and December 31, 2014, the balance of the reserve was $7.2 million and $7.7 million, respectively, and was included in other liabilities. Troubled Debt Restructurings (“TDRs”) Loans that are reported as TDRs are considered impaired and charge-off amounts are taken on an individual loan basis, as deemed appropriate. The majority of restructured loans are loans for which the terms of repayment have been renegotiated, resulting in a reduction in interest rate or deferral of principal. Refer to Note 3 – Summary of Significant Accounting Policies As of September 30, 2015, there were $60.4 million of loans classified as TDRs, of which $15.2 million were nonperforming and $45.2 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, 2015, performing TDRs were comprised of 11 commercial real estate loans of $27.0 million, one construction loan of $7.6 million, three dairy & livestock and agribusiness loans of $5.3 million, 11 SFR mortgage loans of $3.6 million, four commercial and industrial loans of $636,000, one SBA loan of $685,000 and one consumer loan of $417,000. There were no loans removed from TDR classification during the three and nine months ended September 30, 2015 and 2014. 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 $419,000 and $726,000 of specific allowance to TDRs as of September 30, 2015 and December 31, 2014, respectively. The following tables provide a summary of the activity related to TDRs for the periods presented. For the Three Months For the Nine Months Ended 2015 2014 2015 2014 (Dollars in thousands) Performing TDRs: Beginning balance $ 45,166 $ 61,878 $ 53,589 $ 66,955 New modifications (1) 2,353 - 2,383 41 Payoffs and payments, net (2,306 ) (6,270 ) (11,275 ) (11,388 ) TDRs returned to accrual status - - 516 - TDRs placed on nonaccrual status - - - - Ending balance $ 45,213 $ 55,608 $ 45,213 $ 55,608 Nonperforming TDRs: Beginning balance $ 15,167 $ 27,397 $ 20,285 $ 25,119 New modifications (1) 330 - 661 4,187 Charge-offs - (1,061 ) - (1,061 ) Transfer to OREO - - (842 ) - Payoffs and payments, net (349 ) (3,730 ) (4,440 ) (5,639 ) TDRs returned to accrual status - - (516 ) - TDRs placed on nonaccrual status - - - - Ending balance $ 15,148 $ 22,606 $ 15,148 $ 22,606 Total TDRs $ 60,361 $ 78,214 $ 60,361 $ 78,214 (1) New modifications for the three and nine months ended September 30, 2014 represent TDRs acquired from ASB. The following tables summarize loans modified as troubled debt restructurings for the periods presented. Modifications (1) For the Three Months Ended September 30, 2015 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity - - - - - Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Non-owner occupied Interest rate reduction 1 2,376 2,376 2,353 - Change in amortization period or maturity - - - - - Other - - - - - SFR mortgage: Interest rate reduction 1 322 322 330 - Change in amortization period or maturity - - - - - Other - - - - - Consumer: Interest rate reduction - - - - - Total loans 2 $ 2,698 $ 2,698 $ 2,683 $ - For the Three Months Ended September 30, 2014 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity - - - - - Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans - $ - $ - $ - $ - For the Nine Months Ended September 30, 2015 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity 1 30 30 15 12 Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity 1 330 330 325 - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Non-owner occupied Interest rate reduction 1 2,376 2,376 2,353 - Change in amortization period or maturity - - - - - Other - - - - - SFR mortgage: Interest rate reduction 1 322 322 330 - Change in amortization period or maturity - - - - - Other - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans 4 $ 3,058 $ 3,058 $ 3,023 $ 12 For the Nine Months Ended September 30, 2014 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction (3) 2 $ 368 $ 368 $ 337 $ - Change in amortization period or maturity - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction (3) 1 199 199 187 - Change in amortization period or maturity - - - - - Non-owner occupied Interest rate reduction (3) 3 3,573 3,573 3,469 - Change in amortization period or maturity - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans 6 $ 4,140 $ 4,140 $ 3,993 $ - (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. (3) New modifications for the nine months ended September 30, 2014 represent TDRs acquired from ASB. As of September 30, 2015, there were no loans that were previously modified as a TDR within the previous 12 months that subsequently defaulted during the three and nine months ended September 30, 2015.

Earnings Per Share Reconciliati

Earnings Per Share Reconciliation	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share Reconciliation	7. 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 shares issuable upon the assumed exercise of outstanding common stock options. Antidilutive common shares are not included in the calculation of diluted earnings per common share. For the three and nine months ended September 30, 2015, shares deemed to be antidilutive, and thus excluded from the computation of earnings per common share, were 251,000 and 234,000, respectively. For the three and nine months ended September 30, 2014, shares deemed to be antidilutive, and thus excluded from the computation of earnings per common share, were 222,000 and 199,000 shares, respectively. The table below summarizes earnings per common share and diluted earnings per common share, and reconciles the numerator and denominator of both earnings per common share calculations. For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands, except per share amounts) Earnings per common share: Net earnings $ 27,886 $ 24,295 $ 70,532 $ 78,440 Less: Net earnings allocated to restricted stock 149 134 371 409 Net earnings allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031 Weighted average shares outstanding 105,783 104,875 105,672 105,218 Basic earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74 Diluted earnings per common share: Net income allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031 Weighted average shares outstanding 105,783 104,875 105,672 105,218 Incremental shares from assumed exercise of outstanding options 498 531 467 542 Diluted weighted average shares outstanding 106,281 105,406 106,139 105,760 Diluted earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74

Fair Value Information

Fair Value Information	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Information	8. 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, 2015. 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 measurements during the nine months ended September 30, 2015 and 2014. Determination of Fair Value The following is a description of valuation methodologies used for assets and liabilities recorded at fair value and for estimating fair value for financial instruments not recorded at fair value. Cash and Cash Equivalents Interest-Bearing Balances Due from Depository Institutions FHLB Stock Investment Securities Available-for-Sale Investment Securities Held–to-Maturity Loans Held-for-Sale — Loans — The fair value of loans, other than loans on nonaccrual status, was estimated by discounting the remaining contractual cash flows using the estimated current rate at which similar loans would be made to borrowers with similar credit risk characteristics and for the same remaining maturities, reduced by deferred net loan origination fees and the allocable portion of the allowance for loan losses. Accordingly, in determining the estimated current rate for discounting purposes, no adjustment has been made for any change in borrowers’ specific credit risks since the origination or purchase of such loans. Rather, the allocable portion of the allowance for loan losses and the purchase price discounts are considered to provide for such changes in estimating fair value. As a result, this fair value is not necessarily the value which would be derived using an exit price. These loans are included within Level 3 of the fair value hierarchy. Impaired loans and OREO are generally measured using the fair value of the underlying collateral, which is determined based on the most recent appraisal information received, less costs to sell. Appraised values may be adjusted based on factors such as the changes in market conditions from the time of valuation or discounted cash flows of the property. As such, these loans and OREO fall within Level 3 of the fair value hierarchy. The majority of our commitments to extend credit carry current market interest rates if converted to loans. Because these commitments are generally unassignable by either the borrower or us, they only have value to the borrower and us. The estimated fair value approximates the recorded deferred fee amounts and is excluded from the following table because it is not material. Swaps — Deposits & Borrowings — 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 (Level 1) Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSEs $ 20,768 $ - $ 20,768 $ - Residential mortgage-backed securities 1,711,545 - 1,711,545 - CMO’s/REMIC’s - residential 388,497 - 388,497 - Municipal bonds 186,898 - 186,898 - Other securities 5,013 - 5,013 - Total investment securities - AFS 2,312,721 - 2,312,721 - Interest rate swaps 11,694 - 11,694 - Total assets $ 2,324,415 $ - $ 2,324,415 $ - Description of liability Interest rate swaps $ 11,694 $ - $ 11,694 $ - Total liabilities $ 11,694 $ - $ 11,694 $ - Carrying Value at Quoted Prices in Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSEs $ 330,843 $ - $ 330,843 $ - Residential mortgage-backed securities 1,917,496 - 1,917,496 - CMO’s/REMIC’s - residential 304,091 - 304,091 - Municipal bonds 579,641 - 579,641 - Other securities 5,087 - 5,087 - Total investment securities - AFS 3,137,158 - 3,137,158 - Interest rate swaps 10,080 - 10,080 - Total assets $ 3,147,238 $ - $ 3,147,238 $ - Description of liability Interest rate swaps $ 10,080 $ - $ 10,080 $ - Total liabilities $ 10,080 $ - $ 10,080 $ - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis We may be required to measure certain assets at fair value on a non-recurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower of cost or fair value accounting or write-downs of individual assets. For assets measured at fair value on a non-recurring basis that were still held on the balance sheet at September 30, 2015 and December 31, 2014, respectively, the following tables provide the level of valuation assumptions used to determine each adjustment and the carrying value of the related assets for investments that experienced losses during the period. 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 $ 202 $ - $ - $ 202 $ 202 SBA 46 - - 46 4 Real estate: Commercial real estate - - - - - Construction 7,651 - - 7,651 23 SFR mortgage 610 - - 610 237 Dairy & livestock and agribusiness - - - - - Consumer and other loans 249 - - 249 81 Other real estate owned 948 - - 948 162 Total assets $ 9,706 $ - $ - $ 9,706 $ 709 Carrying Value at Quoted Prices (Level 1) Significant Other (Level 2) Significant (Level 3) Total Losses 2014 (Dollars in thousands) Description of assets Impaired loans, excluding PCI Loans: Commercial and industrial $ 1,911 $ - $ - $ 1,911 $ 771 SBA 1,327 - - 1,327 296 Real estate: Commercial real estate 2,500 - - 2,500 271 Construction - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness 103 - - 103 1,061 Consumer and other loans 482 - - 482 447 Other real estate owned - - - - - Total assets $ 6,323 $ - $ - $ 6,323 $ 2,846 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, 2015 and December 31, 2014, respectively. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. September 30, 2015 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 308,227 $ 308,227 $ - $ - $ 308,227 Interest-earning balances due from depository institutions 33,189 - 33,189 - 33,189 FHLB stock 17,588 - 17,588 - 17,588 Investment securities available-for-sale 2,312,721 - 2,312,721 - 2,312,721 Investment securities held-to-maturity 869,650 - 874,446 1,937 876,383 Total loans, net of allowance for loan losses 3,763,022 - - 3,809,324 3,809,324 Swaps 11,694 - 11,694 - 11,694 Liabilities Deposits: Noninterest-bearing $ 3,304,967 $ 3,304,967 $ - $ - $ 3,304,967 Interest-bearing 2,654,505 - 2,654,501 - 2,654,501 Borrowings 610,174 - 610,103 - 610,103 Junior subordinated debentures 25,774 - 26,031 - 26,031 Swaps 11,694 - 11,694 - 11,694 December 31, 2014 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 105,768 $ 105,768 $ - $ - $ 105,768 Interest-earning balances due from depository institutions 27,118 - 27,118 - 27,118 FHLB stock 25,338 - 25,338 - 25,338 Investment securities available-for-sale 3,137,158 - 3,137,158 - 3,137,158 Investment securities held-to-maturity 1,528 - - 2,177 2,177 Total loans, net of allowance for loan losses 3,757,242 - - 3,794,454 3,794,454 Swaps 10,080 - 10,080 - 10,080 Liabilities Deposits: Noninterest-bearing $ 2,866,365 $ 2,866,365 $ - $ - $ 2,866,365 Interest-bearing 2,738,293 - 2,739,221 - 2,739,221 Borrowings 809,106 - 822,607 - 822,607 Junior subordinated debentures 25,774 - 26,005 - 26,005 Swaps 10,080 - 10,080 - 10,080 The fair value estimates presented herein are based on pertinent information available to management as of September 30, 2015 and December 31, 2014. 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, 2015
Segment Reporting [Abstract]
Business Segments	9. BUSINESS SEGMENTS The Company has identified two principal reportable segments: Business Financial and Commercial Banking Centers (“Centers”) and the Treasury Department. The Bank has 40 Business Financial Centers and seven Commercial Banking Centers organized in geographic regions, which are the focal points for customer sales and services, and the Bank will have four additional Business Financial Centers if, as expected, the acquisition of County Commerce Bank is consummated. The Company utilizes an internal reporting system to measure the performance of various operating segments 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 segments in deciding how to allocate resources and to assess performance. Centers are considered one operating segment 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. The Treasury Department’s primary focus is managing the Bank’s investments, liquidity and interest rate risk. Information related to the Company’s remaining operating segments, which include construction lending, dairy & livestock and agribusiness lending, leasing, CitizensTrust, and centralized functions have been aggregated and included in “Other.” In addition, the Company allocates internal funds transfer pricing 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 administration. The following table represents 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 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, 2015 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 36,998 $ 18,927 $ 11,806 $ - $ 67,731 Credit for funds provided (1) 8,977 - 13,249 (22,226 ) - Total interest income 45,975 18,927 25,055 (22,226 ) 67,731 Interest expense 1,654 58 102 - 1,814 Charge for funds used (1) 1,088 15,983 5,155 (22,226 ) - Total interest expense 2,742 16,041 5,257 (22,226 ) 1,814 Net interest income 43,233 2,886 19,798 - 65,917 Recapture of provision for loan losses - - (2,500 ) - (2,500 ) Net interest income after recapture of provision for loan losses 43,233 2,886 22,298 - 68,417 Noninterest income 5,276 (22 ) 3,159 - 8,413 Noninterest expense 12,496 219 20,027 - 32,742 Debt termination expense - - - - - Segment pre-tax profit $ 36,013 $ 2,645 $ 5,430 $ - $ 44,088 Segment assets as of September 30, 2015 $ 6,419,264 $ 3,505,392 $ 809,514 $ (3,107,708 ) $ 7,626,462 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Three Months Ended September 30, 2014 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 35,384 $ 18,397 $ 11,514 $ - $ 65,295 Credit for funds provided (1) 8,190 - 12,037 (20,227 ) - Total interest income 43,574 18,397 23,551 (20,227 ) 65,295 Interest expense 1,637 2,415 5 - 4,057 Charge for funds used (1) 1,061 14,374 4,792 (20,227 ) - Total interest expense 2,698 16,789 4,797 (20,227 ) 4,057 Net interest income 40,876 1,608 18,754 - 61,238 Recapture of provision for loan losses - - (1,000 ) - (1,000 ) Net interest income after recapture of provision for loan losses 40,876 1,608 19,754 - 62,238 Noninterest income 5,288 - 2,721 - 8,009 Noninterest expense 12,221 186 20,074 - 32,481 Debt termination expense - - - - - Segment pre-tax profit $ 33,943 $ 1,422 $ 2,401 $ - $ 37,766 Segment assets as of September 30, 2014 $ 6,086,641 $ 3,431,467 $ 792,404 $ (2,887,663 ) $ 7,422,849 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Nine Months Ended September 30, 2015 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 108,179 $ 56,792 $ 31,455 $ - $ 196,426 Credit for funds provided (1) 25,718 - 38,914 (64,632 ) - Total interest income 133,897 56,792 70,369 (64,632 ) 196,426 Interest expense 4,945 1,520 277 - 6,742 Charge for funds used (1) 3,207 46,230 15,195 (64,632 ) - Total interest expense 8,152 47,750 15,472 (64,632 ) 6,742 Net interest income 125,745 9,042 54,897 - 189,684 Recapture of provision for loan losses - - (4,500 ) - (4,500 ) Net interest income after recapture of provision for loan losses 125,745 9,042 59,397 - 194,184 Noninterest income 15,662 (22 ) 9,129 - 24,769 Noninterest expense 36,604 643 57,630 - 94,877 Debt termination expense - 13,870 - - 13,870 Segment pre-tax profit (loss) $ 104,803 $ (5,493 ) $ 10,896 $ - $ 110,206 Segment assets as of September 30, 2015 $ 6,419,264 $ 3,505,392 $ 809,514 $ (3,107,708 ) $ 7,626,462 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Nine Months Ended September 30, 2014 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 103,158 $ 52,504 $ 31,911 $ - $ 187,573 Credit for funds provided (1) 22,924 - 34,914 (57,838 ) - Total interest income 126,082 52,504 66,825 (57,838 ) 187,573 Interest expense 4,835 7,178 221 - 12,234 Charge for funds used (1) 2,978 40,607 14,253 (57,838 ) - Total interest expense 7,813 47,785 14,474 (57,838 ) 12,234 Net interest income 118,269 4,719 52,351 - 175,339 Recapture of provision for loan losses - - (16,100 ) - (16,100 ) Net interest income after recapture of provision for loan losses 118,269 4,719 68,451 - 191,439 Noninterest income 15,232 - 11,325 - 26,557 Noninterest expense 35,469 564 58,929 - 94,962 Debt termination expense - - - - - Segment pre-tax profit $ 98,032 $ 4,155 $ 20,847 $ - $ 123,034 Segment assets as of September 30, 2014 $ 6,086,641 $ 3,431,467 $ 792,404 $ (2,887,663 ) $ 7,422,849 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	10. 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, 2015, the Bank has entered into 75 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 fixed rate loans. 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, 2015 and December 31, 2014, the total notional amount of the Company’s swaps was $185.0 million, and $197.4 million, respectively. The location of the asset and liability, and their respective fair values are summarized in the table below. September 30, 2015 Asset Derivatives Liability Derivatives Balance Sheet Fair Value Balance Sheet Fair Value (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 11,694 Other liabilities $ 11,694 Total derivatives $ 11,694 $ 11,694 December 31, 2014 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 10,080 Other liabilities $ 10,080 Total derivatives $ 10,080 $ 10,080 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 consolidated statement of earnings for the periods presented. Derivatives Not Designated as Hedging Instruments Location of Gain Amount of Gain Recognized in Income on Derivative Instruments For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (Dollars in thousands) Interest rate swaps Other income $ - $ - $ 199 $ - Total $ - $ - $ 199 $ -

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Other Comprehensive Income (Loss)	11. OTHER COMPREHENSIVE INCOME (LOSS) The tables below provide a summary of the components of other comprehensive income (loss) (“OCI”) for the periods presented. For the Three Months Ended September 30, 2015 2014 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 $ 12,318 $ 5,175 $ 7,143 $ (10,291 ) $ (4,322 ) $ (5,969 ) Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity 6,690 2,808 3,882 - - - Amortization of unrealized gains on securities (334 ) (140 ) (194 ) - - - transferred from available-for-sale to held-to-maturity Net realized loss reclassified into earnings 22 9 13 - - - Net change $ 18,696 $ 7,852 $ 10,844 $ (10,291 ) $ (4,322 ) $ (5,969 ) For the Nine Months Ended September 30, 2015 2014 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 $ (382 ) $ (159 ) $ (223 ) $ 47,272 $ 19,854 $ 27,418 Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity 6,690 2,808 3,882 - - - Amortization of unrealized gains on securities (334 ) (140 ) (194 ) - - - transferred from available-for-sale to held-to-maturity Net realized loss reclassified into earnings 22 9 13 - - - Net change $ 5,996 $ 2,518 $ 3,478 $ 47,272 $ 19,854 $ 27,418 The following table provides a summary of the change in accumulated other comprehensive income for the periods presented. Investment Securities (Dollars in thousands) Balance, January 1, 2015 $ 31,075 Net change in fair value recorded in accumulated OCI 3,465 Net realized loss reclassified into earnings 13 Balance, September 30, 2015 $ 34,553 Investment Securities (Dollars in thousands) Balance, January 1, 2014 $ (9,330 ) Net change in fair value recorded in accumulated OCI 27,418 Net realized loss reclassified into earnings - Balance, September 30, 2014 $ 18,088

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Balance Sheet Offsetting	12. 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 Consolidated Consolidated Consolidated Financial Collateral Balance Sheets Balance Sheets Balance Sheets Instruments Pledged Net Amount (Dollars in thousands) September 30, 2015 Financial assets: Derivatives not designated as hedging instruments $ 11,694 $ - $ - $ 11,694 $ - $ 11,694 Total $ 11,694 $ - $ - $ 11,694 $ - $ 11,694 Financial liabilities: Derivatives not designated as hedging instruments $ 11,694 $ - $ 11,694 $ - $ (16,581 ) $ (4,887 ) Repurchase agreements 610,174 - 610,174 - (673,853 ) (63,679 ) Total $ 621,868 $ - $ 621,868 $ - $ (690,434 ) $ (68,566 ) December 31, 2014 Financial assets: Derivatives not designated as hedging instruments $ 10,080 $ - $ - $ 10,080 $ - $ 10,080 Total $ 10,080 $ - $ - $ 10,080 $ - $ 10,080 Financial liabilities: Derivatives not designated as hedging instruments $ 10,200 $ (120 ) $ 10,080 $ 120 $ (16,734 ) $ (6,534 ) Repurchase agreements 563,627 - 563,627 - (624,578 ) (60,951 ) Total $ 573,827 $ (120 ) $ 573,707 $ 120 $ (641,312 ) $ (67,485 )

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Reclassification	Reclassification
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements
Recent Accounting Pronouncements	Recent Accounting Pronouncements In September 2015, the FASB issued ASU 2015-16, which eliminates the requirement for an acquirer to retrospectively adjust the financial statement for measurement-period adjustments that occur in periods after a business combination is consummated. ASU 2015-16 will be effective for the first interim period within annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s consolidated financial statements.
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, 2015. 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, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Value of Investment Securities	The majority of securities held are publicly traded, and the estimated fair values were obtained from an independent pricing service based upon market quotes. September 30, 2015 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSEs $ 20,753 $ 16 $ (1 ) $ 20,768 0.90 % Residential mortgage-backed securities 1,670,643 40,902 - 1,711,545 74.00 % CMOs/REMICs - residential 380,260 8,237 - 388,497 16.80 % Municipal bonds 182,849 4,049 - 186,898 8.08 % Other securities 5,000 13 - 5,013 0.22 % Total available-for-sale securities $ 2,259,505 $ 53,217 $ (1 ) $ 2,312,721 100.00 % Investment securities held-to-maturity (1): Government agency/GSEs $ 297,204 $ 3,321 $ - $ 300,525 34.18 % Residential mortgage-backed securities 238,993 1,384 - 240,377 27.48 % CMO 1,348 589 - 1,937 0.15 % Municipal bonds 332,105 1,635 (196 ) 333,544 38.19 % Total held-to-maturity securities $ 869,650 $ 6,929 $ (196 ) $ 876,383 100.00 % December 31, 2014 Amortized Gross Gross Fair Value Total (Dollars in thousands) Investment securities available-for-sale: Government agency/GSEs $ 339,071 $ - $ (8,228 ) $ 330,843 10.55% Residential mortgage-backed securities 1,884,370 36,154 (3,028 ) 1,917,496 61.12% CMOs/REMICs - residential 297,318 7,050 (277 ) 304,091 9.69% Municipal bonds 557,823 22,463 (645 ) 579,641 18.48% Other securities 5,000 87 - 5,087 0.16% Total available-for-sale securities $ 3,083,582 $ 65,754 $ (12,178 ) $ 3,137,158 100.00% Investment securities held-to-maturity (1): CMO $ 1,528 $ 649 $ - $ 2,177 100.00% Total held-to-maturity securities $ 1,528 $ 649 $ - $ 2,177 100.00% (1) Securities held-to-maturity are presented in the condensed consolidated balance sheets at amortized cost.
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 2015 2014 2015 2014 (Dollars in thousands) Investment securities available-for-sale: Taxable $ 11,840 $ 12,420 $ 37,548 $ 34,300 Tax-advantaged 2,894 5,227 12,623 15,691 Investment securities held-to-maturity: Taxable 1,688 40 1,762 125 Tax-advantaged 1,748 - 1,748 - Total interest income from investment securities $ 18,170 $ 17,687 $ 53,681 $ 50,116
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, 2015 and December 31, 2014. Management has reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. September 30, 2015 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: Government agency/GSEs $ 9,000 $ 1 $ - $ - $ 9,000 $ 1 Residential mortgage-backed securities - - - - - - CMOs/REMICs - residential - - - - - - Municipal bonds - - - - - - Other securities - - - - - - Total available-for-sale securities $ 9,000 $ 1 $ - $ - $ 9,000 $ 1 Investment securities held-to-maturity: Government agency/GSEs $ - $ - $ - $ - $ - $ - Residential mortgage-backed securities - - - - - - CMO - - - - - - Municipal bonds 81,956 196 - - 81,956 196 Other securities - - - - - - Total held-to-maturity securities $ 81,956 $ 196 $ - $ - $ 81,956 $ 196 December 31, 2014 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: Government agency/GSEs $ 22,224 $ 28 $ 307,873 $ 8,200 $ 330,097 $ 8,228 Residential mortgage-backed securities 19,636 4 145,681 3,024 165,317 3,028 CMOs/REMICs - residential - - 31,143 277 31,143 277 Municipal bonds 1,953 23 24,812 622 26,765 645 Other securities - - - - - - Total available-for-sale securities $ 43,813 $ 55 $ 509,509 $ 12,123 $ 553,322 $ 12,178
Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	Mortgage-backed securities and CMOs/REMICs are included in maturity categories based upon estimated prepayment speeds. September 30, 2015 Available-for-sale Held-to-maturity Amortized Fair Amortized Fair (Dollars in thousands) Due in one year or less $ 91,512 $ 92,781 $ 124,536 $ 125,460 Due after one year through five years 1,894,584 1,939,712 139,716 141,134 Due after five years through ten years 118,633 121,282 554,537 558,832 Due after ten years 154,776 158,946 50,861 50,957 Total investment securities $ 2,259,505 $ 2,312,721 $ 869,650 $ 876,383

Acquired SJB Assets and FDIC 22

Acquired SJB Assets and FDIC Loss Sharing Asset (Tables)	9 Months Ended
	Sep. 30, 2015
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 their credit quality indicators for the periods indicated. September 30, 2015 December 31, 2014 (Dollars in thousands) Commercial and industrial $ 8,062 $ 14,605 SBA 414 1,110 Real estate: Commercial real estate 87,522 109,350 Construction - - SFR mortgage 198 205 Dairy & livestock and agribusiness 523 4,890 Municipal lease finance receivables - - Consumer and other loans 2,466 3,336 Gross PCI loans 99,185 133,496 Less: Purchase accounting discount (4,754 ) (7,129 ) Gross PCI loans, net of discount 94,431 126,367 Less: Allowance for PCI loans losses - - Net PCI loans $ 94,431 $ 126,367
Summary of PCI Loans by Internal Risk Ratings	The following table summarizes PCI loans by internal risk ratings for the periods indicated. September 30, 2015 December 31, 2014 (Dollars in thousands) Pass $ 22,108 $ 26,706 Watch list 57,308 77,371 Special mention 13,379 8,203 Substandard 6,390 21,216 Doubtful & loss - - Total PCI gross loans $ 99,185 $ 133,496

Loans and Lease Finance Recei23

Loans and Lease Finance Receivables and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2015
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, 2015 December 31, 2014 (Dollars in thousands) Commercial and industrial $ 413,709 $ 390,011 SBA 116,126 134,265 Real estate: Commercial real estate 2,569,128 2,487,803 Construction 57,578 55,173 SFR mortgage 221,696 205,124 Dairy & livestock and agribusiness 212,670 279,173 Municipal lease finance receivables 75,839 77,834 Consumer and other loans 69,630 69,884 Gross loans, excluding PCI loans 3,736,376 3,699,267 Less: Deferred loan fees, net (8,636 ) (8,567 ) Gross loans, excluding PCI loans, net of deferred loan fees 3,727,740 3,690,700 Less: Allowance for loan losses (59,149 ) (59,825 ) Net loans, excluding PCI loans 3,668,591 3,630,875 PCI Loans 99,185 133,496 Discount on PCI loans (4,754 ) (7,129 ) PCI loans, net 94,431 126,367 Total loans and lease finance receivables $ 3,763,022 $ 3,757,242
Summary of Loan, Excluding PCI Loans by Internal Risk Ratings	The following tables summarize each class of loans, excluding PCI loans, according to our internal risk ratings for the periods presented. September 30, 2015 Pass Watch List Special Mention Substandard Doubtful & Loss Total (Dollars in thousands) Commercial and industrial $ 278,042 $ 95,419 $ 36,338 $ 3,668 $ 242 $ 413,709 SBA 72,280 22,218 13,648 6,531 1,449 116,126 Real estate: Commercial real estate Owner occupied 613,734 145,354 50,171 13,560 - 822,819 Non-owner occupied 1,462,203 216,513 27,413 40,180 - 1,746,309 Construction Speculative 28,962 6,302 - 7,651 - 42,915 Non-speculative 14,663 - - - - 14,663 SFR mortgage 194,265 20,104 4,241 3,086 - 221,696 Dairy & livestock and agribusiness 88,147 112,419 12,104 - - 212,670 Municipal lease finance receivables 46,084 24,787 4,968 - - 75,839 Consumer and other loans 53,327 11,797 1,667 2,748 91 69,630 Total gross loans, excluding PCI loans $ 2,851,707 $ 654,913 $ 150,550 $ 77,424 $ 1,782 $ 3,736,376 December 31, 2014 Pass Watch List Special Mention Substandard Doubtful & Loss Total (Dollars in thousands) Commercial and industrial $ 234,029 $ 105,904 $ 33,795 $ 16,031 $ 252 $ 390,011 SBA 84,769 24,124 15,858 7,920 1,594 134,265 Real estate: Commercial real estate Owner occupied 552,072 159,908 46,248 32,139 - 790,367 Non-owner occupied 1,347,006 241,809 56,353 52,268 - 1,697,436 Construction Speculative 28,310 613 - 7,651 - 36,574 Non-speculative 18,071 528 - - - 18,599 SFR mortgage 174,311 20,218 2,442 8,153 - 205,124 Dairy & livestock and agribusiness 174,783 85,660 8,612 10,015 103 279,173 Municipal lease finance receivables 35,463 22,349 20,022 - - 77,834 Consumer and other loans 62,904 2,233 1,789 2,763 195 69,884 Total gross loans, excluding PCI loans $ 2,711,718 $ 663,346 $ 185,119 $ 136,940 $ 2,144 $ 3,699,267
Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Portfolio Segment	The following tables present the balance and activity related to the allowance for loan losses for held-for-investment loans, by portfolio segment for the periods presented. For the Three Months Ended September 30, 2015 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 7,185 $ (82 ) $ 50 $ (620 ) $ 6,533 SBA 2,085 - 2 (122 ) 1,965 Real estate: Commercial real estate 35,414 (10 ) 2,018 (2,811 ) 34,611 Construction 746 - 8 119 873 SFR mortgage 2,564 - - 75 2,639 Dairy & livestock and agribusiness 3,974 - 98 796 4,868 Municipal lease finance receivables 1,014 - - 17 1,031 Consumer and other loans 834 - 11 (16 ) 829 Unallocated 5,738 - - 62 5,800 Total allowance for loan losses $ 59,554 $ (92 ) $ 2,187 $ (2,500 ) $ 59,149 For the Three Months Ended September 30, 2014 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 6,037 $ (2 ) $ 187 $ 1,254 $ 7,476 SBA 2,365 - - (1,157 ) 1,208 Real estate: Commercial real estate 35,918 - 2 (286 ) 35,634 Construction 605 - 37 148 790 SFR mortgage 2,214 - 188 (97 ) 2,305 Dairy & livestock and agribusiness 5,428 (1,061 ) 151 (241 ) 4,277 Municipal lease finance receivables 1,464 - - 4 1,468 Consumer and other loans 930 (7 ) 113 (169 ) 867 Unallocated 6,013 - - (456 ) 5,557 Total allowance for loan losses $ 60,974 $ (1,070 ) $ 678 $ (1,000 ) $ 59,582 For the Nine Months Ended September 30, 2015 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 7,074 $ (216 ) $ 282 $ (607 ) $ 6,533 SBA 2,557 (33 ) 39 (598 ) 1,965 Real estate: Commercial real estate 33,373 (117 ) 3,658 (2,303 ) 34,611 Construction 988 - 58 (173 ) 873 SFR mortgage 2,344 (215 ) 185 325 2,639 Dairy & livestock and agribusiness 5,479 - 308 (919 ) 4,868 Municipal lease finance receivables 1,412 - - (381 ) 1,031 Consumer and other loans 1,262 (197 ) 72 (308 ) 829 Unallocated 5,336 - - 464 5,800 Total allowance for loan losses $ 59,825 $ (778 ) $ 4,602 $ (4,500 ) $ 59,149 For the Nine Months Ended September 30, 2014 Ending Charge-offs Recoveries (Recapture of) Ending (Dollars in thousands) Commercial and industrial $ 8,502 $ (556 ) $ 685 $ (1,155 ) $ 7,476 SBA 2,332 - 63 (1,187 ) 1,208 Real estate: Commercial real estate 39,402 (352 ) 140 (3,556 ) 35,634 Construction 1,305 - 834 (1,349 ) 790 SFR mortgage 2,718 - 188 (601 ) 2,305 Dairy & livestock and agribusiness 11,728 (1,061 ) 393 (6,783 ) 4,277 Municipal lease finance receivables 2,335 - - (867 ) 1,468 Consumer and other loans 960 (26 ) 139 (206 ) 867 Unallocated 5,953 - - (396 ) 5,557 Total allowance for loan losses $ 75,235 $ (1,995 ) $ 2,442 $ (16,100 ) $ 59,582
Schedule of Recorded Investment in Loans Held-for-Investment, Excluding PCI Loans, and Related Allowance for Loan Losses by Portfolio Segment	The following tables present the recorded investment in loans held-for-investment, excluding PCI loans, and the related allowance for loan losses by portfolio segment, based on the Company’s methodology for determining the allowance for loan losses for the periods presented. September 30, 2015 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Individually Collectively (Dollars in thousands) Commercial and industrial $ 1,687 $ 412,022 $ 607 $ 5,926 SBA 3,319 112,807 4 1,961 Real estate: Commercial real estate 43,647 2,525,481 - 34,611 Construction 7,651 49,927 23 850 SFR mortgage 6,389 215,307 22 2,617 Dairy & livestock and agribusiness 5,262 207,408 - 4,868 Municipal lease finance receivables - 75,839 - 1,031 Consumer and other loans 906 68,724 6 823 Unallocated - - - 5,800 Total $ 68,861 $ 3,667,515 $ 662 $ 58,487 September 30, 2014 Recorded Investment in Loans Allowance for Loan Losses Individually Collectively Individually Collectively (Dollars in thousands) Commercial and industrial $ 4,467 $ 376,009 $ 652 $ 6,824 SBA 3,242 129,926 59 1,149 Real estate: Commercial real estate 31,375 2,434,540 - 35,634 Construction 26,419 40,810 - 790 SFR mortgage 7,755 185,450 39 2,266 Dairy & livestock and agribusiness 18,939 173,991 - 4,277 Municipal lease finance receivables - 80,013 - 1,468 Consumer and other loans 461 69,350 4 863 Unallocated - - - 5,557 Total $ 92,658 $ 3,490,089 $ 754 $ 58,828
Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Excluding PCI Loans by Type of Loans	The following tables present the recorded investment in the aging of, past due and nonaccrual loans, excluding PCI loans, by type of loans for the periods presented. September 30, 2015 30-59 60-89 Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ - $ - $ - $ 1,051 $ 412,658 $ 413,709 SBA - - - 2,634 113,492 116,126 Real estate: Commercial real estate Owner occupied - - - 4,279 818,540 822,819 Non-owner occupied 266 - 266 12,417 1,733,626 1,746,309 Construction - Speculative (2) - - - - 42,915 42,915 Non-speculative - - - - 14,663 14,663 SFR mortgage - - - 2,778 218,918 221,696 Dairy & livestock and agribusiness - - - - 212,670 212,670 Municipal lease finance receivables - - - - 75,839 75,839 Consumer and other loans 52 - 52 489 69,089 69,630 Total gross loans, excluding PCI Loans $ 318 $ - $ 318 $ 23,648 $ 3,712,410 $ 3,736,376 (1) As of September 30, 2015, $19.1 million of nonaccruing loans were current, $371,000 were 30-59 days past due, $2.3 million were 60-89 days (2) Speculative construction loans are generally for properties where there is no identified buyer or renter. December 31, 2014 30-59 60-89 Total Past Nonaccrual Current Total Loans (Dollars in thousands) Commercial and industrial $ 943 $ 35 $ 978 $ 2,308 $ 386,725 $ 390,011 SBA 75 - 75 2,481 131,709 134,265 Real estate: Commercial real estate Owner occupied 36 86 122 4,072 786,173 790,367 Non-owner occupied - - - 19,246 1,678,190 1,697,436 Construction Speculative - - - - 36,574 36,574 Non-speculative - - - - 18,599 18,599 SFR mortgage 425 - 425 3,240 201,459 205,124 Dairy & livestock and agribusiness - - - 103 279,070 279,173 Municipal lease finance receivables - - - - 77,834 77,834 Consumer and other loans 64 17 81 736 69,067 69,884 Total gross loans, excluding PCI Loans $ 1,543 $ 138 $ 1,681 $ 32,186 $ 3,665,400 $ 3,699,267 (1) As of December 31, 2014, $20.1 million of nonaccruing loans were current, $3.7 million were 30-59 days past due, $8.5 million were 90+ days past due.
Schedule of Held-for-Investment Loans, Excluding PCI Loans, Individually Evaluated for Impairment by Class of Loans	The following tables present information for held-for-investment loans, excluding PCI loans, individually evaluated for impairment by class of loans, as of and for the periods indicated below. As of and For the Nine Months Ended September 30, 2015 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 1,067 $ 1,926 $ - $ 1,166 $ 23 SBA 3,273 3,911 - 3,385 39 Real estate: Commercial real estate Owner occupied 7,665 8,806 - 7,935 178 Non-owner occupied 35,982 40,591 - 36,490 1,338 Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 5,788 6,739 - 6,392 82 Dairy & livestock and agribusiness 5,262 5,650 - 5,569 180 Municipal lease finance receivables - - - - - Consumer and other loans 852 1,379 - 881 12 Total 59,889 69,002 - 61,818 1,852 With a related allowance recorded: Commercial and industrial 620 694 607 637 - SBA 46 47 4 58 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner occupied - - - - - Construction Speculative 7,651 7,651 23 7,651 290 Non-speculative - - - - - SFR mortgage 601 653 22 612 9 Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 54 59 6 56 - Total 8,972 9,104 662 9,014 299 Total impaired loans $ 68,861 $ 78,106 $ 662 $ 70,832 $ 2,151 As of and For the Nine Months Ended September 30, 2014 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 2,913 $ 3,954 $ - $ 2,912 $ 44 SBA 3,183 3,907 - 2,937 - Real estate: Commercial real estate Owner occupied 8,742 9,896 - 9,025 238 Non-owner occupied 22,633 29,545 - 23,252 541 Construction Speculative 17,318 18,407 - 17,440 232 Non-speculative 9,101 9,101 - 9,145 463 SFR mortgage 7,285 9,685 - 7,934 82 Dairy & livestock and agribusiness 18,939 20,698 - 21,205 819 Municipal lease finance receivables - - - - - Consumer and other loans 450 876 - 455 - Total 90,564 106,069 - 94,305 2,419 With a related allowance recorded: Commercial and industrial 1,554 1,882 652 1,560 - SBA 59 69 59 66 - Real estate: Commercial real estate Owner occupied - - - - - Non-owner occupied - - - - - Construction Speculative - - - - - Non-speculative - - - - - SFR mortgage 470 484 39 476 - Dairy & livestock and agribusiness - - - - - Municipal lease finance receivables - - - - - Consumer and other loans 11 15 4 12 - Total 2,094 2,450 754 2,114 - Total impaired loans $ 92,658 $ 108,519 $ 754 $ 96,419 $ 2,419 As of December 31, 2014 Recorded Unpaid Related (Dollars in thousands) With no related allowance recorded: Commercial and industrial $ 2,391 $ 3,624 $ - SBA 1,853 2,197 - Real estate: Commercial real estate Owner occupied 16,961 18,166 - Non-owner occupied 30,068 38,156 - Construction Speculative 7,651 7,651 - Non-speculative - - - SFR mortgage 6,512 7,493 - Dairy & livestock and agribusiness 15,796 17,587 - Municipal lease finance receivables - - - Consumer and other loans 673 1,094 - Total 81,905 95,968 - With a related allowance recorded: Commercial and industrial 629 698 615 SBA 1,327 1,591 296 Real estate: Commercial real estate Owner occupied - - - Non-owner occupied 982 1,278 154 Construction Speculative - - - Non-speculative - - - SFR mortgage 467 484 35 Dairy & livestock and agribusiness - - - Municipal lease finance receivables - - - Consumer and other loans 482 508 449 Total 3,887 4,559 1,549 Total impaired loans $ 85,792 $ 100,527 $ 1,549
Summary of Activity Related to Troubled Debt Restructurings	The following tables provide a summary of the activity related to TDRs for the periods presented. For the Three Months For the Nine Months Ended 2015 2014 2015 2014 (Dollars in thousands) Performing TDRs: Beginning balance $ 45,166 $ 61,878 $ 53,589 $ 66,955 New modifications (1) 2,353 - 2,383 41 Payoffs and payments, net (2,306 ) (6,270 ) (11,275 ) (11,388 ) TDRs returned to accrual status - - 516 - TDRs placed on nonaccrual status - - - - Ending balance $ 45,213 $ 55,608 $ 45,213 $ 55,608 Nonperforming TDRs: Beginning balance $ 15,167 $ 27,397 $ 20,285 $ 25,119 New modifications (1) 330 - 661 4,187 Charge-offs - (1,061 ) - (1,061 ) Transfer to OREO - - (842 ) - Payoffs and payments, net (349 ) (3,730 ) (4,440 ) (5,639 ) TDRs returned to accrual status - - (516 ) - TDRs placed on nonaccrual status - - - - Ending balance $ 15,148 $ 22,606 $ 15,148 $ 22,606 Total TDRs $ 60,361 $ 78,214 $ 60,361 $ 78,214 (1) New modifications for the three and nine months ended September 30, 2014 represent TDRs acquired from ASB.
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, 2015 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity - - - - - Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Non-owner occupied Interest rate reduction 1 2,376 2,376 2,353 - Change in amortization period or maturity - - - - - Other - - - - - SFR mortgage: Interest rate reduction 1 322 322 330 - Change in amortization period or maturity - - - - - Other - - - - - Consumer: Interest rate reduction - - - - - Total loans 2 $ 2,698 $ 2,698 $ 2,683 $ - For the Three Months Ended September 30, 2014 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity - - - - - Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Non-owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans - $ - $ - $ - $ - For the Nine Months Ended September 30, 2015 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction - $ - $ - $ - $ - Change in amortization period or maturity 1 30 30 15 12 Other - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity 1 330 330 325 - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Non-owner occupied Interest rate reduction 1 2,376 2,376 2,353 - Change in amortization period or maturity - - - - - Other - - - - - SFR mortgage: Interest rate reduction 1 322 322 330 - Change in amortization period or maturity - - - - - Other - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans 4 $ 3,058 $ 3,058 $ 3,023 $ 12 For the Nine Months Ended September 30, 2014 Number of Pre-Modification Post-Modification Outstanding Financial Effect (Dollars in thousands) Commercial and industrial: Interest rate reduction (3) 2 $ 368 $ 368 $ 337 $ - Change in amortization period or maturity - - - - - SBA: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Other - - - - - Real estate: Commercial real estate: Owner occupied Interest rate reduction (3) 1 199 199 187 - Change in amortization period or maturity - - - - - Non-owner occupied Interest rate reduction (3) 3 3,573 3,573 3,469 - Change in amortization period or maturity - - - - - Dairy & livestock and agribusiness: Interest rate reduction - - - - - Change in amortization period or maturity - - - - - Consumer: Interest rate reduction - - - - - Total loans 6 $ 4,140 $ 4,140 $ 3,993 $ - (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. (3) New modifications for the nine months ended September 30, 2014 represent TDRs acquired from ASB.

Earnings Per Share Reconcilia24

Earnings Per Share Reconciliation (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Common Share Reconciliation	The table below summarizes earnings per common share and diluted earnings per common share, and reconciles the numerator and denominator of both earnings per common share calculations. For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands, except per share amounts) Earnings per common share: Net earnings $ 27,886 $ 24,295 $ 70,532 $ 78,440 Less: Net earnings allocated to restricted stock 149 134 371 409 Net earnings allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031 Weighted average shares outstanding 105,783 104,875 105,672 105,218 Basic earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74 Diluted earnings per common share: Net income allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031 Weighted average shares outstanding 105,783 104,875 105,672 105,218 Incremental shares from assumed exercise of outstanding options 498 531 467 542 Diluted weighted average shares outstanding 106,281 105,406 106,139 105,760 Diluted earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74

Fair Value Information (Tables)

Fair Value Information (Tables)	9 Months Ended
	Sep. 30, 2015
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 (Level 1) Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSEs $ 20,768 $ - $ 20,768 $ - Residential mortgage-backed securities 1,711,545 - 1,711,545 - CMO’s/REMIC’s - residential 388,497 - 388,497 - Municipal bonds 186,898 - 186,898 - Other securities 5,013 - 5,013 - Total investment securities - AFS 2,312,721 - 2,312,721 - Interest rate swaps 11,694 - 11,694 - Total assets $ 2,324,415 $ - $ 2,324,415 $ - Description of liability Interest rate swaps $ 11,694 $ - $ 11,694 $ - Total liabilities $ 11,694 $ - $ 11,694 $ - Carrying Value at Quoted Prices in Significant Other Significant (Dollars in thousands) Description of assets Investment securities - AFS: Government agency/GSEs $ 330,843 $ - $ 330,843 $ - Residential mortgage-backed securities 1,917,496 - 1,917,496 - CMO’s/REMIC’s - residential 304,091 - 304,091 - Municipal bonds 579,641 - 579,641 - Other securities 5,087 - 5,087 - Total investment securities - AFS 3,137,158 - 3,137,158 - Interest rate swaps 10,080 - 10,080 - Total assets $ 3,147,238 $ - $ 3,147,238 $ - Description of liability Interest rate swaps $ 10,080 $ - $ 10,080 $ - Total liabilities $ 10,080 $ - $ 10,080 $ -
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	the following tables provide the level of valuation assumptions used to determine each adjustment and the carrying value of the related assets for investments that experienced losses during the period. 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 $ 202 $ - $ - $ 202 $ 202 SBA 46 - - 46 4 Real estate: Commercial real estate - - - - - Construction 7,651 - - 7,651 23 SFR mortgage 610 - - 610 237 Dairy & livestock and agribusiness - - - - - Consumer and other loans 249 - - 249 81 Other real estate owned 948 - - 948 162 Total assets $ 9,706 $ - $ - $ 9,706 $ 709 Carrying Value at Quoted Prices (Level 1) Significant Other (Level 2) Significant (Level 3) Total Losses 2014 (Dollars in thousands) Description of assets Impaired loans, excluding PCI Loans: Commercial and industrial $ 1,911 $ - $ - $ 1,911 $ 771 SBA 1,327 - - 1,327 296 Real estate: Commercial real estate 2,500 - - 2,500 271 Construction - - - - - SFR mortgage - - - - - Dairy & livestock and agribusiness 103 - - 103 1,061 Consumer and other loans 482 - - 482 447 Other real estate owned - - - - - Total assets $ 6,323 $ - $ - $ 6,323 $ 2,846
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, 2015 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 308,227 $ 308,227 $ - $ - $ 308,227 Interest-earning balances due from depository institutions 33,189 - 33,189 - 33,189 FHLB stock 17,588 - 17,588 - 17,588 Investment securities available-for-sale 2,312,721 - 2,312,721 - 2,312,721 Investment securities held-to-maturity 869,650 - 874,446 1,937 876,383 Total loans, net of allowance for loan losses 3,763,022 - - 3,809,324 3,809,324 Swaps 11,694 - 11,694 - 11,694 Liabilities Deposits: Noninterest-bearing $ 3,304,967 $ 3,304,967 $ - $ - $ 3,304,967 Interest-bearing 2,654,505 - 2,654,501 - 2,654,501 Borrowings 610,174 - 610,103 - 610,103 Junior subordinated debentures 25,774 - 26,031 - 26,031 Swaps 11,694 - 11,694 - 11,694 December 31, 2014 Estimated Fair Value Carrying Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Total cash and cash equivalents $ 105,768 $ 105,768 $ - $ - $ 105,768 Interest-earning balances due from depository institutions 27,118 - 27,118 - 27,118 FHLB stock 25,338 - 25,338 - 25,338 Investment securities available-for-sale 3,137,158 - 3,137,158 - 3,137,158 Investment securities held-to-maturity 1,528 - - 2,177 2,177 Total loans, net of allowance for loan losses 3,757,242 - - 3,794,454 3,794,454 Swaps 10,080 - 10,080 - 10,080 Liabilities Deposits: Noninterest-bearing $ 2,866,365 $ 2,866,365 $ - $ - $ 2,866,365 Interest-bearing 2,738,293 - 2,739,221 - 2,739,221 Borrowings 809,106 - 822,607 - 822,607 Junior subordinated debentures 25,774 - 26,005 - 26,005 Swaps 10,080 - 10,080 - 10,080

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2015
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, 2015 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 36,998 $ 18,927 $ 11,806 $ - $ 67,731 Credit for funds provided (1) 8,977 - 13,249 (22,226 ) - Total interest income 45,975 18,927 25,055 (22,226 ) 67,731 Interest expense 1,654 58 102 - 1,814 Charge for funds used (1) 1,088 15,983 5,155 (22,226 ) - Total interest expense 2,742 16,041 5,257 (22,226 ) 1,814 Net interest income 43,233 2,886 19,798 - 65,917 Recapture of provision for loan losses - - (2,500 ) - (2,500 ) Net interest income after recapture of provision for loan losses 43,233 2,886 22,298 - 68,417 Noninterest income 5,276 (22 ) 3,159 - 8,413 Noninterest expense 12,496 219 20,027 - 32,742 Debt termination expense - - - - - Segment pre-tax profit $ 36,013 $ 2,645 $ 5,430 $ - $ 44,088 Segment assets as of September 30, 2015 $ 6,419,264 $ 3,505,392 $ 809,514 $ (3,107,708 ) $ 7,626,462 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Three Months Ended September 30, 2014 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 35,384 $ 18,397 $ 11,514 $ - $ 65,295 Credit for funds provided (1) 8,190 - 12,037 (20,227 ) - Total interest income 43,574 18,397 23,551 (20,227 ) 65,295 Interest expense 1,637 2,415 5 - 4,057 Charge for funds used (1) 1,061 14,374 4,792 (20,227 ) - Total interest expense 2,698 16,789 4,797 (20,227 ) 4,057 Net interest income 40,876 1,608 18,754 - 61,238 Recapture of provision for loan losses - - (1,000 ) - (1,000 ) Net interest income after recapture of provision for loan losses 40,876 1,608 19,754 - 62,238 Noninterest income 5,288 - 2,721 - 8,009 Noninterest expense 12,221 186 20,074 - 32,481 Debt termination expense - - - - - Segment pre-tax profit $ 33,943 $ 1,422 $ 2,401 $ - $ 37,766 Segment assets as of September 30, 2014 $ 6,086,641 $ 3,431,467 $ 792,404 $ (2,887,663 ) $ 7,422,849 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Nine Months Ended September 30, 2015 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 108,179 $ 56,792 $ 31,455 $ - $ 196,426 Credit for funds provided (1) 25,718 - 38,914 (64,632 ) - Total interest income 133,897 56,792 70,369 (64,632 ) 196,426 Interest expense 4,945 1,520 277 - 6,742 Charge for funds used (1) 3,207 46,230 15,195 (64,632 ) - Total interest expense 8,152 47,750 15,472 (64,632 ) 6,742 Net interest income 125,745 9,042 54,897 - 189,684 Recapture of provision for loan losses - - (4,500 ) - (4,500 ) Net interest income after recapture of provision for loan losses 125,745 9,042 59,397 - 194,184 Noninterest income 15,662 (22 ) 9,129 - 24,769 Noninterest expense 36,604 643 57,630 - 94,877 Debt termination expense - 13,870 - - 13,870 Segment pre-tax profit (loss) $ 104,803 $ (5,493 ) $ 10,896 $ - $ 110,206 Segment assets as of September 30, 2015 $ 6,419,264 $ 3,505,392 $ 809,514 $ (3,107,708 ) $ 7,626,462 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation. For the Nine Months Ended September 30, 2014 Centers Treasury Other Eliminations Total (Dollars in thousands) Interest income, including loan fees $ 103,158 $ 52,504 $ 31,911 $ - $ 187,573 Credit for funds provided (1) 22,924 - 34,914 (57,838 ) - Total interest income 126,082 52,504 66,825 (57,838 ) 187,573 Interest expense 4,835 7,178 221 - 12,234 Charge for funds used (1) 2,978 40,607 14,253 (57,838 ) - Total interest expense 7,813 47,785 14,474 (57,838 ) 12,234 Net interest income 118,269 4,719 52,351 - 175,339 Recapture of provision for loan losses - - (16,100 ) - (16,100 ) Net interest income after recapture of provision for loan losses 118,269 4,719 68,451 - 191,439 Noninterest income 15,232 - 11,325 - 26,557 Noninterest expense 35,469 564 58,929 - 94,962 Debt termination expense - - - - - Segment pre-tax profit $ 98,032 $ 4,155 $ 20,847 $ - $ 123,034 Segment assets as of September 30, 2014 $ 6,086,641 $ 3,431,467 $ 792,404 $ (2,887,663 ) $ 7,422,849 (1) Credit for funds provided and charges for funds used are eliminated in the condensed consolidated presentation.

Derivative Financial Instrume27

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	The location of the asset and liability, and their respective fair values are summarized in the table below. September 30, 2015 Asset Derivatives Liability Derivatives Balance Sheet Fair Value Balance Sheet Fair Value (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 11,694 Other liabilities $ 11,694 Total derivatives $ 11,694 $ 11,694 December 31, 2014 Asset Derivatives Liability Derivatives Balance Sheet Fair Balance Sheet Fair (Dollars in thousands) Derivatives not designated as hedging instruments: Interest rate swaps Other assets $ 10,080 Other liabilities $ 10,080 Total derivatives $ 10,080 $ 10,080
Effect of Derivative Instruments on Consolidated Statement of Earnings	The following table summarizes the effect of derivative financial instruments on the consolidated statement of earnings for the periods presented. Derivatives Not Designated as Hedging Instruments Location of Gain Amount of Gain Recognized in Income on Derivative Instruments For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (Dollars in thousands) Interest rate swaps Other income $ - $ - $ 199 $ - Total $ - $ - $ 199 $ -

Other Comprehensive Income (L28

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Summary of Components of Other Comprehensive Income (Loss)	The tables below provide a summary of the components of other comprehensive income (loss) (“OCI”) for the periods presented. For the Three Months Ended September 30, 2015 2014 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 $ 12,318 $ 5,175 $ 7,143 $ (10,291 ) $ (4,322 ) $ (5,969 ) Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity 6,690 2,808 3,882 - - - Amortization of unrealized gains on securities (334 ) (140 ) (194 ) - - - transferred from available-for-sale to held-to-maturity Net realized loss reclassified into earnings 22 9 13 - - - Net change $ 18,696 $ 7,852 $ 10,844 $ (10,291 ) $ (4,322 ) $ (5,969 ) For the Nine Months Ended September 30, 2015 2014 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 $ (382 ) $ (159 ) $ (223 ) $ 47,272 $ 19,854 $ 27,418 Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity 6,690 2,808 3,882 - - - Amortization of unrealized gains on securities (334 ) (140 ) (194 ) - - - transferred from available-for-sale to held-to-maturity Net realized loss reclassified into earnings 22 9 13 - - - Net change $ 5,996 $ 2,518 $ 3,478 $ 47,272 $ 19,854 $ 27,418
Summary of Change in Accumulated Other Comprehensive Income	The following table provides a summary of the change in accumulated other comprehensive income for the periods presented. Investment Securities (Dollars in thousands) Balance, January 1, 2015 $ 31,075 Net change in fair value recorded in accumulated OCI 3,465 Net realized loss reclassified into earnings 13 Balance, September 30, 2015 $ 34,553 Investment Securities (Dollars in thousands) Balance, January 1, 2014 $ (9,330 ) Net change in fair value recorded in accumulated OCI 27,418 Net realized loss reclassified into earnings - Balance, September 30, 2014 $ 18,088

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2015
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 Consolidated Consolidated Consolidated Financial Collateral Balance Sheets Balance Sheets Balance Sheets Instruments Pledged Net Amount (Dollars in thousands) September 30, 2015 Financial assets: Derivatives not designated as hedging instruments $ 11,694 $ - $ - $ 11,694 $ - $ 11,694 Total $ 11,694 $ - $ - $ 11,694 $ - $ 11,694 Financial liabilities: Derivatives not designated as hedging instruments $ 11,694 $ - $ 11,694 $ - $ (16,581 ) $ (4,887 ) Repurchase agreements 610,174 - 610,174 - (673,853 ) (63,679 ) Total $ 621,868 $ - $ 621,868 $ - $ (690,434 ) $ (68,566 ) December 31, 2014 Financial assets: Derivatives not designated as hedging instruments $ 10,080 $ - $ - $ 10,080 $ - $ 10,080 Total $ 10,080 $ - $ - $ 10,080 $ - $ 10,080 Financial liabilities: Derivatives not designated as hedging instruments $ 10,200 $ (120 ) $ 10,080 $ 120 $ (16,734 ) $ (6,534 ) Repurchase agreements 563,627 - 563,627 - (624,578 ) (60,951 ) Total $ 573,827 $ (120 ) $ 573,707 $ 120 $ (641,312 ) $ (67,485 )

Business - Additional Informati

Business - Additional Information (Detail) $ in Millions	Oct. 14, 2015USD ($)Branch	Sep. 30, 2015FinancialCentersSubsidiary
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary		1
Bank operated Business Financial Centers, number		40
Bank operated Commercial Banking Centers, number		7
Bank operated trust offices, number		3
County Commerce Bank [Member] | Subsequent Event [Member]
Schedule Of Description Of Company [Line Items]
Total assets of merger company | $	$ 250
Number of branches owned by merger company | Branch	4

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 2,259,505	$ 3,083,582
Gross Unrealized Holding Gain, Available-for-sale	53,217	65,754
Gross Unrealized Holding Loss, Available-for-sale	(1)	(12,178)
Fair Value, Available-for-sale	$ 2,312,721	$ 3,137,158
Total Percent, Available-for-sale	100.00%	100.00%
Amortized Cost, Held-to-maturity	$ 869,650	$ 1,528
Gross Unrealized Holding Gain, Held-to-maturity	6,929	649
Gross Unrealized Holding Loss, Held-to-maturity	(196)	0
Fair Value, Held-to-maturity	$ 876,383	$ 2,177
Total Percent, Held-to-maturity	100.00%	100.00%
CMO's/REMIC's - Residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 380,260	$ 297,318
Gross Unrealized Holding Gain, Available-for-sale	8,237	7,050
Gross Unrealized Holding Loss, Available-for-sale	0	(277)
Fair Value, Available-for-sale	$ 388,497	$ 304,091
Total Percent, Available-for-sale	16.80%	9.69%
Amortized Cost, Held-to-maturity	$ 1,348	$ 1,528
Gross Unrealized Holding Gain, Held-to-maturity	589	649
Gross Unrealized Holding Loss, Held-to-maturity	0	0
Fair Value, Held-to-maturity	$ 1,937	$ 2,177
Total Percent, Held-to-maturity	0.15%	100.00%
Municipal Bonds [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 182,849	$ 557,823
Gross Unrealized Holding Gain, Available-for-sale	4,049	22,463
Gross Unrealized Holding Loss, Available-for-sale	0	(645)
Fair Value, Available-for-sale	$ 186,898	$ 579,641
Total Percent, Available-for-sale	8.08%	18.48%
Amortized Cost, Held-to-maturity	$ 332,105
Gross Unrealized Holding Gain, Held-to-maturity	1,635
Gross Unrealized Holding Loss, Held-to-maturity	(196)
Fair Value, Held-to-maturity	$ 333,544
Total Percent, Held-to-maturity	38.19%
Government Agency/GSEs [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 20,753	$ 339,071
Gross Unrealized Holding Gain, Available-for-sale	16	0
Gross Unrealized Holding Loss, Available-for-sale	(1)	(8,228)
Fair Value, Available-for-sale	$ 20,768	$ 330,843
Total Percent, Available-for-sale	0.90%	10.55%
Amortized Cost, Held-to-maturity	$ 297,204
Gross Unrealized Holding Gain, Held-to-maturity	3,321
Gross Unrealized Holding Loss, Held-to-maturity	0
Fair Value, Held-to-maturity	$ 300,525
Total Percent, Held-to-maturity	34.18%
Residential Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 1,670,643	$ 1,884,370
Gross Unrealized Holding Gain, Available-for-sale	40,902	36,154
Gross Unrealized Holding Loss, Available-for-sale	0	(3,028)
Fair Value, Available-for-sale	$ 1,711,545	$ 1,917,496
Total Percent, Available-for-sale	74.00%	61.12%
Amortized Cost, Held-to-maturity	$ 238,993
Gross Unrealized Holding Gain, Held-to-maturity	1,384
Gross Unrealized Holding Loss, Held-to-maturity	0
Fair Value, Held-to-maturity	$ 240,377
Total Percent, Held-to-maturity	27.48%
Other Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Amortized Cost, Available-for-sale	$ 5,000	$ 5,000
Gross Unrealized Holding Gain, Available-for-sale	13	87
Gross Unrealized Holding Loss, Available-for-sale	0	0
Fair Value, Available-for-sale	$ 5,013	$ 5,087
Total Percent, Available-for-sale	0.22%	0.16%

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of securities	$ 898,600,000		$ 898,600,000
Net unrealized holding gain after tax	3,900,000
Average life of investment grade debt securities, years			4 years 1 month 6 days
Credit-related impairment loss on investment securities held-to-maturity	0	$ 0	$ 0	$ 0
Investment securities pledged as collateral	2,810,000,000		2,810,000,000		$ 3,110,000,000
Investment in FHLB stock, impairment losses	$ 0		$ 0
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage	84.00%		84.00%
Government Agency/GSEs [Member]
Schedule of Available-for-sale Securities [Line Items]
Agency bond callable			$ 221,200,000
CMO's/REMIC's - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
CMOs backed by whole loans issued by private-label companies (non-government sponsored)	$ 1,500,000		$ 1,500,000
Investment contractual cash flows guaranteed by Government, percentage	99.93%		99.93%
Investment contractual cash flows guaranteed by banks, percentage	0.07%		0.07%
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average life of investment grade debt securities, years			8 years 3 months 18 days

Investment Securities - Summa33

Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Investment Income [Line Items]
Total investment income	$ 18,170	$ 17,687	$ 53,681	$ 50,116
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	11,840	12,420	37,548	34,300
Tax-advantaged	2,894	5,227	12,623	15,691
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	1,688	40	1,762	125
Tax-advantaged	$ 1,748	$ 0	$ 1,748	$ 0

Investment Securities - Summa34

Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 9,000	$ 43,813
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	1	55
Fair Value, 12 Months or Longer, Available-for-sale	0	509,509
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	12,123
Fair Value, Available-for-sale	9,000	553,322
Gross Unrealized Holding Losses, Available-for-sale	1	12,178
Fair Value, Less Than 12 Months, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	196
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Held-to-maturity	196
CMO's/REMIC's - Residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	0
Fair Value, 12 Months or Longer, Available-for-sale	0	31,143
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	277
Fair Value, Available-for-sale	0	31,143
Gross Unrealized Holding Losses, Available-for-sale	0	277
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Municipal Bonds [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	1,953
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	23
Fair Value, 12 Months or Longer, Available-for-sale	0	24,812
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	622
Fair Value, Available-for-sale	0	26,765
Gross Unrealized Holding Losses, Available-for-sale	0	645
Fair Value, Less Than 12 Months, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	196
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	81,956
Gross Unrealized Holding Losses, Held-to-maturity	196
Government Agency/GSEs [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	9,000	22,224
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	1	28
Fair Value, 12 Months or Longer, Available-for-sale	0	307,873
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	8,200
Fair Value, Available-for-sale	9,000	330,097
Gross Unrealized Holding Losses, Available-for-sale	1	8,228
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Residential Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	19,636
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	4
Fair Value, 12 Months or Longer, Available-for-sale	0	145,681
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	0	3,024
Fair Value, Available-for-sale	0	165,317
Gross Unrealized Holding Losses, Available-for-sale	0	3,028
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	0
Other Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	0	0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	0	0
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	0	0
Gross Unrealized Holding Losses, Available-for-sale	0	$ 0
Fair Value, Less Than 12 Months, Held-to-maturity	0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity	0
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	0
Gross Unrealized Holding Losses, Held-to-maturity	$ 0

Investment Securities - Summa35

Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost, Held-to-maturity	$ 124,536
Due after one year through five years, Amortized Cost, Held-to-maturity	139,716
Due after five years through ten years, Amortized Cost, Held-to-maturity	554,537
Due after ten years, Amortized Cost, Held-to-maturity	50,861
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis	869,650
Due in one year or less, Fair Value, Held-to-maturity	125,460
Due after one year through five years, Fair Value, Held-to-maturity	141,134
Due after five years through ten years, Fair Value, Held-to-maturity	558,832
Due after ten years, Fair Value, Held-to-maturity	50,957
Total, Held-to-maturity, Fair Value	876,383
Due in one year or less, Amortized Cost, Available-for-sale	91,512
Due after one year through five years, Amortized Cost, Available-for-sale	1,894,584
Due after five years through ten years, Amortized Cost, Available-for-sale	118,633
Due after ten years, Amortized Cost, Available-for-sale	154,776
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Available-for-sale	2,259,505
Due in one year or less, Amortized Cost, Available-for-sale	92,781
Due after one year through five years, Amortized Cost, Available-for-sale	1,939,712
Due after five years through ten years, Amortized Cost, Available-for-sale	121,282
Due after ten years, Amortized Cost, Available-for-sale	158,946
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Available-for-sale	$ 2,312,721

Acquired SJB Assets and FDIC 36

Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) - USD ($)	Oct. 16, 2009	Sep. 30, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition date		Oct. 16, 2009
After-tax gain included in earnings due to purchase method	$ 12,300,000
Remaining discount associated with SJB loans		$ 4,800,000
Expected cash flows		$ 2,800,000
Remaining average lives of respective pools loans		3 years 2 months 12 days
Remaining average lives of respective individual loans		10 months 24 days
Allowance for PCI loans losses		$ 0	$ 0

Acquired SJB Assets and FDIC 37

Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans and Lease Finance Receivables (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Real estate:
Less: Allowance for PCI loans losses	$ 0	$ 0
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	8,062,000	14,605,000
SBA	414,000	1,110,000
Real estate:
Commercial real estate	87,522,000	109,350,000
Construction	0	0
SFR mortgage	198,000	205,000
Dairy & livestock and agribusiness	523,000	4,890,000
Municipal lease finance receivables	0	0
Consumer and other loans	2,466,000	3,336,000
Gross PCI loans	99,185,000	133,496,000
Less: Purchase accounting discount	(4,754,000)	(7,129,000)
Gross PCI loans, net of discount	94,431,000	126,367,000
Less: Allowance for PCI loans losses	0	0
Net PCI loans	$ 94,431,000	$ 126,367,000

Acquired SJB Assets and FDIC 38

Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans by Internal Risk Ratings (Detail) - PCI Loans [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	$ 99,185	$ 133,496
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	22,108	26,706
Watch List [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	57,308	77,371
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	13,379	8,203
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	6,390	21,216
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	$ 0	$ 0

Loans and Lease Finance Recei39

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, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding PCI loans, net of deferred loan fees	$ 3,822,171		$ 3,817,067
Less: Allowance for loan losses	(59,149)	$ (59,554)	(59,825)	$ (59,582)	$ (60,974)	$ (75,235)
Total loans and lease finance receivables	3,763,022		3,757,242
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	413,709		390,011
SBA	116,126		134,265
Commercial real estate	2,569,128		2,487,803
Construction	57,578		55,173
SFR mortgage	221,696		205,124
Dairy & livestock and agribusiness	212,670		279,173
Municipal lease finance receivables	75,839		77,834
Consumer and other loans	69,630		69,884
Total gross loans, excluding PCI loans	3,736,376		3,699,267
Less: Deferred loan fees, net	(8,636)		(8,567)
Gross loans, excluding PCI loans, net of deferred loan fees	3,727,740		3,690,700
Less: Allowance for loan losses	(59,149)		(59,825)
Net PCI loans	3,668,591		3,630,875
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	8,062		14,605
PCI Loans	99,185		133,496
SBA	414		1,110
Discount on PCI loans	(4,754)		(7,129)
Commercial real estate	87,522		109,350
Construction	0		0
SFR mortgage	198		205
Dairy & livestock and agribusiness	523		4,890
Municipal lease finance receivables	0		0
Consumer and other loans	2,466		3,336
Net PCI loans	$ 94,431		$ 126,367

Loans and Lease Finance Recei40

Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)SecurityLoan	Sep. 30, 2014USD ($)SecurityLoan	Sep. 30, 2015USD ($)SecurityLoan	Sep. 30, 2014USD ($)SecurityLoan	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total fixed rate loans held	$ 1,840,000,000		$ 1,840,000,000
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank	2,890,000,000		2,890,000,000		$ 2,780,000,000
Impaired, at carrying value	68,861,000	$ 92,658,000	68,861,000	$ 92,658,000	85,792,000
Loans classified as troubled debt restructured	60,400,000		60,400,000
Provision for unfunded loan commitments	0	$ 1,250,000	500,000	$ 1,250,000
Reserve for credit risk for undisbursed commitments	$ 7,200,000		$ 7,200,000		7,700,000
Number of loans | SecurityLoan	0		0
Allocation of allowance to troubled debt restructuring	$ 419,000		$ 419,000		726,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	68.76%		68.76%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	1.54%		1.54%
Nonaccrual Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 1,100,000		$ 1,100,000
Nonaccrual Small Business Administration Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,600,000		2,600,000
Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	60,400,000		60,400,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	2,569,128,000		2,569,128,000		2,487,803,000
Dairy & livestock and agribusiness	212,670,000		212,670,000		279,173,000
Impaired, at carrying value					85,800,000
Outstanding balance	23,648,000		23,648,000		32,186,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	0		0		103,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	197,900,000		197,900,000		268,100,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	14,800,000		14,800,000		11,100,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,051,000		1,051,000		2,308,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	489,000		489,000		736,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 2,634,000		$ 2,634,000		$ 2,481,000
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)	6.66%		6.66%		6.66%
Commercial real estate loans	$ 171,000,000		$ 171,000,000		$ 165,600,000
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	132,800,000		132,800,000		144,100,000
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	38,200,000		38,200,000		21,500,000
Nonaccrual Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	16,700,000		16,700,000
Nonaccrual Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	489,000		489,000
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	15,200,000		15,200,000
Loans classified as troubled debt restructured	15,200,000		15,200,000
Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	68,900,000		68,900,000
Loans classified as troubled debt restructured	45,200,000		$ 45,200,000
Number of performing loans | SecurityLoan			32
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	27,000,000		$ 27,000,000
Number of loans | SecurityLoan			11
Performing Financing Receivable [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	7,600,000		$ 7,600,000
Number of loans | SecurityLoan			1
Performing Financing Receivable [Member] | Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	5,300,000		$ 5,300,000
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	3,600,000		$ 3,600,000
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	636,000		$ 636,000
Number of loans | SecurityLoan			4
Performing Financing Receivable [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 417,000		$ 417,000
Number of loans | SecurityLoan			1
Number of loans removed from TDR classification | SecurityLoan	0	0	0	0
Performing Financing Receivable [Member] | Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 685,000		$ 685,000
Number of loans | SecurityLoan			1
Nonaccrual Single Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,800,000		$ 2,800,000
Allowance Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value					$ 1,500,000
Loans classified as troubled debt restructured	$ 662,000		$ 662,000

Loans and Lease Finance Recei41

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, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	$ 413,709	$ 390,011
SBA	116,126	134,265
Commercial real estate, Owner occupied	822,819	790,367
Commercial real estate, Non-owner occupied	1,746,309	1,697,436
Construction, Speculative	42,915	36,574
Construction, Non-speculative	14,663	18,599
SFR mortgage	221,696	205,124
Dairy & livestock and agribusiness	212,670	279,173
Municipal lease finance receivables	75,839	77,834
Consumer and other loans	69,630	69,884
Total gross loans, excluding PCI loans	3,736,376	3,699,267
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	278,042	234,029
SBA	72,280	84,769
Commercial real estate, Owner occupied	613,734	552,072
Commercial real estate, Non-owner occupied	1,462,203	1,347,006
Construction, Speculative	28,962	28,310
Construction, Non-speculative	14,663	18,071
SFR mortgage	194,265	174,311
Dairy & livestock and agribusiness	88,147	174,783
Municipal lease finance receivables	46,084	35,463
Consumer and other loans	53,327	62,904
Total gross loans, excluding PCI loans	2,851,707	2,711,718
Watch List [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	95,419	105,904
SBA	22,218	24,124
Commercial real estate, Owner occupied	145,354	159,908
Commercial real estate, Non-owner occupied	216,513	241,809
Construction, Speculative	6,302	613
Construction, Non-speculative	0	528
SFR mortgage	20,104	20,218
Dairy & livestock and agribusiness	112,419	85,660
Municipal lease finance receivables	24,787	22,349
Consumer and other loans	11,797	2,233
Total gross loans, excluding PCI loans	654,913	663,346
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	36,338	33,795
SBA	13,648	15,858
Commercial real estate, Owner occupied	50,171	46,248
Commercial real estate, Non-owner occupied	27,413	56,353
Construction, Speculative	0	0
Construction, Non-speculative	0	0
SFR mortgage	4,241	2,442
Dairy & livestock and agribusiness	12,104	8,612
Municipal lease finance receivables	4,968	20,022
Consumer and other loans	1,667	1,789
Total gross loans, excluding PCI loans	150,550	185,119
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	3,668	16,031
SBA	6,531	7,920
Commercial real estate, Owner occupied	13,560	32,139
Commercial real estate, Non-owner occupied	40,180	52,268
Construction, Speculative	7,651	7,651
Construction, Non-speculative	0	0
SFR mortgage	3,086	8,153
Dairy & livestock and agribusiness	0	10,015
Municipal lease finance receivables	0	0
Consumer and other loans	2,748	2,763
Total gross loans, excluding PCI loans	77,424	136,940
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	242	252
SBA	1,449	1,594
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	103
Municipal lease finance receivables	0	0
Consumer and other loans	91	195
Total gross loans, excluding PCI loans	$ 1,782	$ 2,144

Loans and Lease Finance Recei42

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 Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 59,554	$ 60,974	$ 59,825	$ 75,235
Charge-offs	(92)	(1,070)	(778)	(1,995)
Recoveries	2,187	678	4,602	2,442
(Recapture of) Provision for Loan Losses	(2,500)	(1,000)	(4,500)	(16,100)
Ending Balance	59,149	59,582	59,149	59,582
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,185	6,037	7,074	8,502
Charge-offs	(82)	(2)	(216)	(556)
Recoveries	50	187	282	685
(Recapture of) Provision for Loan Losses	(620)	1,254	(607)	(1,155)
Ending Balance	6,533	7,476	6,533	7,476
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,085	2,365	2,557	2,332
Charge-offs	0	0	(33)	0
Recoveries	2	0	39	63
(Recapture of) Provision for Loan Losses	(122)	(1,157)	(598)	(1,187)
Ending Balance	1,965	1,208	1,965	1,208
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	35,414	35,918	33,373	39,402
Charge-offs	(10)	0	(117)	(352)
Recoveries	2,018	2	3,658	140
(Recapture of) Provision for Loan Losses	(2,811)	(286)	(2,303)	(3,556)
Ending Balance	34,611	35,634	34,611	35,634
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	746	605	988	1,305
Charge-offs	0	0	0	0
Recoveries	8	37	58	834
(Recapture of) Provision for Loan Losses	119	148	(173)	(1,349)
Ending Balance	873	790	873	790
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,564	2,214	2,344	2,718
Charge-offs	0	0	(215)	0
Recoveries	0	188	185	188
(Recapture of) Provision for Loan Losses	75	(97)	325	(601)
Ending Balance	2,639	2,305	2,639	2,305
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,974	5,428	5,479	11,728
Charge-offs	0	(1,061)	0	(1,061)
Recoveries	98	151	308	393
(Recapture of) Provision for Loan Losses	796	(241)	(919)	(6,783)
Ending Balance	4,868	4,277	4,868	4,277
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,014	1,464	1,412	2,335
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
(Recapture of) Provision for Loan Losses	17	4	(381)	(867)
Ending Balance	1,031	1,468	1,031	1,468
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	834	930	1,262	960
Charge-offs	0	(7)	(197)	(26)
Recoveries	11	113	72	139
(Recapture of) Provision for Loan Losses	(16)	(169)	(308)	(206)
Ending Balance	829	867	829	867
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5,738	6,013	5,336	5,953
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
(Recapture of) Provision for Loan Losses	62	(456)	464	(396)
Ending Balance	$ 5,800	$ 5,557	$ 5,800	$ 5,557

Loans and Lease Finance Recei43

Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment, Excluding PCI Loans, and Related Allowance for Loan Losses by Portfolio Segment (Detail) - Loans, Excluding PCI Loans [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 68,861	$ 92,658
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,667,515	3,490,089
Allowance for Loan Losses, Individually Evaluated for Impairment	662	754
Allowance for Loan Losses, Collectively Evaluated for Impairment	58,487	58,828
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,687	4,467
Recorded Investment in Loans, Collectively Evaluated for Impairment	412,022	376,009
Allowance for Loan Losses, Individually Evaluated for Impairment	607	652
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,926	6,824
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	3,319	3,242
Recorded Investment in Loans, Collectively Evaluated for Impairment	112,807	129,926
Allowance for Loan Losses, Individually Evaluated for Impairment	4	59
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,961	1,149
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	43,647	31,375
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,525,481	2,434,540
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	34,611	35,634
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	7,651	26,419
Recorded Investment in Loans, Collectively Evaluated for Impairment	49,927	40,810
Allowance for Loan Losses, Individually Evaluated for Impairment	23	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	850	790
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	6,389	7,755
Recorded Investment in Loans, Collectively Evaluated for Impairment	215,307	185,450
Allowance for Loan Losses, Individually Evaluated for Impairment	22	39
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,617	2,266
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	5,262	18,939
Recorded Investment in Loans, Collectively Evaluated for Impairment	207,408	173,991
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,868	4,277
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	75,839	80,013
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,031	1,468
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	906	461
Recorded Investment in Loans, Collectively Evaluated for Impairment	68,724	69,350
Allowance for Loan Losses, Individually Evaluated for Impairment	6	4
Allowance for Loan Losses, Collectively Evaluated for Impairment	823	863
Unallocated [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
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	$ 5,800	$ 5,557

Loans and Lease Finance Recei44

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 Type of Loans (Detail) - Loans, Excluding PCI Loans [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	$ 318	$ 1,681
Nonaccrual	23,648	32,186
Current	3,712,410	3,665,400
Total gross loans, excluding PCI loans	3,736,376	3,699,267
30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	318	1,543
60 - 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	138
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	978
Nonaccrual	1,051	2,308
Current	412,658	386,725
Total gross loans, excluding PCI loans	413,709	390,011
Commercial and Industrial [Member] | 30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	943
Commercial and Industrial [Member] | 60 - 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	35
Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	75
Nonaccrual	2,634	2,481
Current	113,492	131,709
Total gross loans, excluding PCI loans	116,126	134,265
Small Business Administration [Member] | 30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	75
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
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	122
Nonaccrual	4,279	4,072
Current	818,540	786,173
Total gross loans, excluding PCI loans	822,819	790,367
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	0	36
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	86
Commercial Real Estate Non-owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	266	0
Nonaccrual	12,417	19,246
Current	1,733,626	1,678,190
Total gross loans, excluding PCI loans	1,746,309	1,697,436
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	266	0
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
Construction Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	42,915	36,574
Total gross loans, excluding PCI loans	42,915	36,574
Construction Speculative [Member] | 30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Construction Speculative [Member] | 60 - 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Construction Non-speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	14,663	18,599
Total gross loans, excluding PCI loans	14,663	18,599
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
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
SFR Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	425
Nonaccrual	2,778	3,240
Current	218,918	201,459
Total gross loans, excluding PCI loans	221,696	205,124
SFR Mortgage [Member] | 30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	425
SFR Mortgage [Member] | 60 - 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	103
Current	212,670	279,070
Total gross loans, excluding PCI loans	212,670	279,173
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
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
Municipal Lease Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	0	0
Nonaccrual	0	0
Current	75,839	77,834
Total gross loans, excluding PCI loans	75,839	77,834
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
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
Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	52	81
Nonaccrual	489	736
Current	69,089	69,067
Total gross loans, excluding PCI loans	69,630	69,884
Consumer and Other Loans [Member] | 30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due and Accruing	52	64
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	$ 17

Loans and Lease Finance Recei45

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 Type of Loans (Parenthetical) (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing loans, current	$ 19,100,000	$ 20,100,000
Nonaccruing loans, 30-59 days past due	371,000	3,700,000
Nonaccruing loans, 60-89 days past due	2,300,000
90+ Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing loans, 90+ days past due	$ 1,900,000	$ 8,500,000

Loans and Lease Finance Recei46

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, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, Total impaired loans	$ 68,861	$ 92,658	$ 85,792
Unpaid Principal Balance, Total impaired loans	78,106	108,519	100,527
Related Allowance, Total impaired loans	662	754	1,549
Average Recorded Investment, Total impaired loans	70,832	96,419
Interest Income Recognized, Total impaired loans	2,151	2,419
Recorded Investment, With no related allowance recorded	59,889	90,564	81,905
Unpaid Principal Balance, With no related allowance recorded	69,002	106,069	95,968
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	61,818	94,305
Interest Income Recognized, With no related allowance recorded	1,852	2,419
Recorded Investment, With a related allowance recorded	8,972	2,094	3,887
Unpaid Principal Balance, With a related allowance recorded	9,104	2,450	4,559
Related Allowance, With a related allowance recorded	662	754	1,549
Average Recorded Investment, With a related allowance recorded	9,014	2,114
Interest Income Recognized, With a related allowance recorded	299	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,067	2,913	2,391
Unpaid Principal Balance, With no related allowance recorded	1,926	3,954	3,624
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	1,166	2,912
Interest Income Recognized, With no related allowance recorded	23	44
Recorded Investment, With a related allowance recorded	620	1,554	629
Unpaid Principal Balance, With a related allowance recorded	694	1,882	698
Related Allowance, With a related allowance recorded	607	652	615
Average Recorded Investment, With a related allowance recorded	637	1,560
Interest Income Recognized, With a related allowance recorded	0	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	3,273	3,183	1,853
Unpaid Principal Balance, With no related allowance recorded	3,911	3,907	2,197
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	3,385	2,937
Interest Income Recognized, With no related allowance recorded	39	0
Recorded Investment, With a related allowance recorded	46	59	1,327
Unpaid Principal Balance, With a related allowance recorded	47	69	1,591
Related Allowance, With a related allowance recorded	4	59	296
Average Recorded Investment, With a related allowance recorded	58	66
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	7,665	8,742	16,961
Unpaid Principal Balance, With no related allowance recorded	8,806	9,896	18,166
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	7,935	9,025
Interest Income Recognized, With no related allowance recorded	178	238
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0
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	35,982	22,633	30,068
Unpaid Principal Balance, With no related allowance recorded	40,591	29,545	38,156
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	36,490	23,252
Interest Income Recognized, With no related allowance recorded	1,338	541
Recorded Investment, With a related allowance recorded	0	0	982
Unpaid Principal Balance, With a related allowance recorded	0	0	1,278
Related Allowance, With a related allowance recorded	0	0	154
Average Recorded Investment, With a related allowance recorded	0	0
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	17,318	7,651
Unpaid Principal Balance, With no related allowance recorded	0	18,407	7,651
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	17,440
Interest Income Recognized, With no related allowance recorded	0	232
Recorded Investment, With a related allowance recorded	7,651	0	0
Unpaid Principal Balance, With a related allowance recorded	7,651	0	0
Related Allowance, With a related allowance recorded	23	0	0
Average Recorded Investment, With a related allowance recorded	7,651	0
Interest Income Recognized, With a related allowance recorded	290	0
Construction Non-speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0	9,101	0
Unpaid Principal Balance, With no related allowance recorded	0	9,101	0
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	9,145
Interest Income Recognized, With no related allowance recorded	0	463
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a 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	5,788	7,285	6,512
Unpaid Principal Balance, With no related allowance recorded	6,739	9,685	7,493
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	6,392	7,934
Interest Income Recognized, With no related allowance recorded	82	82
Recorded Investment, With a related allowance recorded	601	470	467
Unpaid Principal Balance, With a related allowance recorded	653	484	484
Related Allowance, With a related allowance recorded	22	39	35
Average Recorded Investment, With a related allowance recorded	612	476
Interest Income Recognized, With a related allowance recorded	9	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	5,262	18,939	15,796
Unpaid Principal Balance, With no related allowance recorded	5,650	20,698	17,587
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	5,569	21,205
Interest Income Recognized, With no related allowance recorded	180	819
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a related allowance recorded	0	0
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
Unpaid Principal Balance, With no related allowance recorded	0	0	0
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With a related allowance recorded	0	0	0
Unpaid Principal Balance, With a related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	0	0	0
Average Recorded Investment, With a 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	852	450	673
Unpaid Principal Balance, With no related allowance recorded	1,379	876	1,094
Related Allowance, With no related allowance recorded	0	0	0
Average Recorded Investment, With no related allowance recorded	881	455
Interest Income Recognized, With no related allowance recorded	12	0
Recorded Investment, With a related allowance recorded	54	11	482
Unpaid Principal Balance, With a related allowance recorded	59	15	508
Related Allowance, With a related allowance recorded	6	4	$ 449
Average Recorded Investment, With a related allowance recorded	56	12
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

Loans and Lease Finance Recei47

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 (Parenthetical) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Receivables [Abstract]
Recorded Investment, With no related allowance recorded	$ 59,889	$ 90,564	$ 81,905
Recorded Investment, With a related allowance recorded	8,972	2,094	3,887
Recorded Investment, Total impaired loans	68,861	92,658	85,792
Unpaid Principal Balance, With no related allowance recorded	69,002	106,069	95,968
Unpaid Principal Balance, With a related allowance recorded	9,104	2,450	4,559
Unpaid Principal Balance, Total impaired loans	78,106	108,519	100,527
Related Allowance, With no related allowance recorded	0	0	0
Related Allowance, With a related allowance recorded	662	754	1,549
Related Allowance, Total impaired loans	662	754	$ 1,549
Average Recorded Investment, With no related allowance recorded	61,818	94,305
Average Recorded Investment, With a related allowance recorded	9,014	2,114
Average Recorded Investment, Total impaired loans	70,832	96,419
Interest Income Recognized, With no related allowance recorded	1,852	2,419
Interest Income Recognized, With a related allowance recorded	299	0
Interest Income Recognized, Total impaired loans	$ 2,151	$ 2,419

Loans and Lease Finance Recei48

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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 60,361	$ 78,214	$ 60,361	$ 78,214
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	45,166	61,878	53,589	66,955
New modifications	2,353	0	2,383	41
Payoffs and payments, net	(2,306)	(6,270)	(11,275)	(11,388)
TDRs returned to accrual status	0	0	516	0
TDRs placed on nonaccrual status	0	0	0	0
Ending balance	45,213	55,608	45,213	55,608
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	15,167	27,397	20,285	25,119
New modifications	330	0	661	4,187
Charge-offs	0	(1,061)	0	(1,061)
Transfer to OREO	0	0	(842)	0
Payoffs and payments, net	(349)	(3,730)	(4,440)	(5,639)
TDRs returned to accrual status	0	0	(516)	0
TDRs placed on nonaccrual status	0	0	0	0
Ending balance	$ 15,148	$ 22,606	$ 15,148	$ 22,606

Loans and Lease Finance Recei49

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, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract
Modified Loan [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	2	0	4	6
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,698	$ 0	$ 3,058	$ 4,140
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,698	0	3,058	4,140
Troubled debt restructurings, Outstanding Recorded Investment	3,023	3,993	3,023	3,993
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 12	$ 0
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 368
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	368
Troubled debt restructurings, Outstanding Recorded Investment	0	337	0	337
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 30	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	30	0
Troubled debt restructurings, Outstanding Recorded Investment	15	0	15	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 12	0
Commercial and Industrial [Member] | Other [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	$ 0
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	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	0	0	1	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 330	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	330	0
Troubled debt restructurings, Outstanding Recorded Investment	325	0	325	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Small Business Administration [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
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	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 199
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	199
Troubled debt restructurings, Outstanding Recorded Investment	0	187	0	187
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Owner Occupied [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0		0
Troubled debt restructurings, Outstanding Recorded Investment	0		0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 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	1	0	1	3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 2,376	$ 0	$ 2,376	$ 3,573
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	2,376	0	2,376	3,573
Troubled debt restructurings, Outstanding Recorded Investment	2,353	3,469	2,353	3,469
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 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	0	0	0	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Non-owner Occupied [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0		0
Troubled debt restructurings, Outstanding Recorded Investment	0		0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0		$ 0
Single Family Mortgage Loans [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	1		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 322		$ 322
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	322		322
Troubled debt restructurings, Outstanding Recorded Investment	330		330
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0		$ 0
Single Family Mortgage Loans [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0		0
Troubled debt restructurings, Outstanding Recorded Investment	0		0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0		$ 0
Single Family Mortgage Loans [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans | Contract	0		0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0		0
Troubled debt restructurings, Outstanding Recorded Investment	0		0
Troubled debt restructurings, Financial Effect Resulting From Modifications	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	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	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	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	0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Outstanding Recorded Investment	0	0	0	0
Troubled debt restructurings, Financial Effect Resulting From Modifications	$ 0	$ 0	$ 0	$ 0

Earnings Per Share Reconcilia50

Earnings Per Share Reconciliation - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per common share	251,000	222,000	234,000	199,000

Earnings Per Share Reconcilia51

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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings per common share:
Net earnings	$ 27,886	$ 24,295	$ 70,532	$ 78,440
Less: Net earnings allocated to restricted stock	149	134	371	409
Net earnings allocated to common shareholders	$ 27,737	$ 24,161	$ 70,161	$ 78,031
Weighted average shares outstanding	105,783	104,875	105,672	105,218
Basic earnings per common share	$ 0.26	$ 0.23	$ 0.66	$ 0.74
Diluted earnings per common share:
Net income allocated to common shareholders	$ 27,737	$ 24,161	$ 70,161	$ 78,031
Weighted average shares outstanding	105,783	104,875	105,672	105,218
Incremental shares from assumed exercise of outstanding options	498	531	467	542
Diluted weighted average shares outstanding	106,281	105,406	106,139	105,760
Diluted earnings per common share	$ 0.26	$ 0.23	$ 0.66	$ 0.74

Fair Value Information - Additi

Fair Value Information - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value assets transfers from Level 1 to Level 2	$ 0	$ 0
Fair value assets transfers from Level 2 to Level 1	0	0
Fair value liabilities transfers from Level 1 to Level 2	0	0
Fair value liabilities transfers from Level 2 to Level 1	$ 0	$ 0
Minimum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Term of interest rate swap contracts by the counterparty, years	3 years
Maximum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Term of interest rate swap contracts by the counterparty, years	30 years

Fair Value Information - Assets

Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	$ 621,868	$ 573,707
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	0	0
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	11,694	10,080
Interest rate swaps	11,694	10,080
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	2,324,415	3,147,238
Total liabilities	11,694	10,080
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] | Government Agency/GSEs [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/GSEs [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	20,768	330,843
Fair Value on Recurring Basis [Member] | Government Agency/GSEs [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	1,711,545	1,917,496
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's/REMIC's - 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's/REMIC's - Residential [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	388,497	304,091
Fair Value on Recurring Basis [Member] | CMO's/REMIC's - 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] | 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	186,898	579,641
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] | 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	5,013	5,087
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	2,312,721	3,137,158
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	0	0
Interest rate swaps	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	11,694	10,080
Interest rate swaps	11,694	10,080
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	0	0
Interest rate swaps	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	2,324,415	3,147,238
Total liabilities	11,694	10,080
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Government Agency/GSEs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	20,768	330,843
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	1,711,545	1,917,496
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO's/REMIC's - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS	388,497	304,091
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	186,898	579,641
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	5,013	5,087
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	2,312,721	3,137,158
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	11,694	10,080
Interest rate swaps	$ 11,694	$ 10,080

Fair Value Information - Asse54

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, 2015	Dec. 31, 2014
Description of assets
Total assets	$ 709	$ 2,846
Other Real Estate Owned [Member]
Description of assets
Total assets	162	0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	202	771
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	4	296
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets		271
Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	23	0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	237	0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	1,061
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	81	447
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] | 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
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] | 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
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	9,706	6,323
Level 3 [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	948	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	202	1,911
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	46	1,327
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets		2,500
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	7,651	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	610	0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	103
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	249	482
Carrying Value [Member]
Description of assets
Total assets	9,706	6,323
Carrying Value [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	948	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	202	1,911
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]
Description of assets
Total assets	46	1,327
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets		2,500
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]
Description of assets
Total assets	7,651	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]
Description of assets
Total assets	610	0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	0	103
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]
Description of assets
Total assets	$ 249	$ 482

Fair Value Information - Estima

Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Assets
Total cash and cash equivalents	$ 308,227	$ 105,768	$ 240,056	$ 94,693
Interest-earning balances due from depository institutions	33,189	27,118
FHLB stock	17,588	25,338
Investment securities available-for-sale	2,312,721	3,137,158
Investment securities held-to-maturity	869,650	1,528
Total loans, net of allowance for loan losses	3,763,022	3,757,242
Deposits:
Noninterest-bearing	3,304,967	2,866,365
Interest-bearing	2,654,505	2,738,293
Junior subordinated debentures	25,774	25,774
Swaps	621,868	573,707
Carrying Value [Member]
Assets
Total cash and cash equivalents	308,227	105,768
Interest-earning balances due from depository institutions	33,189	27,118
FHLB stock	17,588	25,338
Investment securities available-for-sale	2,312,721	3,137,158
Investment securities held-to-maturity	869,650	1,528
Total loans, net of allowance for loan losses	3,763,022	3,757,242
Swaps	11,694	10,080
Deposits:
Noninterest-bearing	3,304,967	2,866,365
Interest-bearing	2,654,505	2,738,293
Borrowings	610,174	809,106
Junior subordinated debentures	25,774	25,774
Swaps	11,694	10,080
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	308,227	105,768
Interest-earning balances due from depository institutions	33,189	27,118
FHLB stock	17,588	25,338
Investment securities available-for-sale	2,312,721	3,137,158
Investment securities held-to-maturity	876,383	2,177
Total loans, net of allowance for loan losses	3,809,324	3,794,454
Swaps	11,694	10,080
Deposits:
Noninterest-bearing	3,304,967	2,866,365
Interest-bearing	2,654,501	2,739,221
Borrowings	610,103	822,607
Junior subordinated debentures	26,031	26,005
Swaps	11,694	10,080
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	308,227	105,768
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	3,304,967	2,866,365
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	33,189	27,118
FHLB stock	17,588	25,338
Investment securities available-for-sale	2,312,721	3,137,158
Investment securities held-to-maturity	874,446	0
Total loans, net of allowance for loan losses	0	0
Swaps	11,694	10,080
Deposits:
Noninterest-bearing	0	0
Interest-bearing	2,654,501	2,739,221
Borrowings	610,103	822,607
Junior subordinated debentures	26,031	26,005
Swaps	11,694	10,080
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	1,937	2,177
Total loans, net of allowance for loan losses	3,809,324	3,794,454
Swaps	0	0
Deposits:
Noninterest-bearing	0	0
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Swaps	$ 0	$ 0

Business Segments - Additional

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015FinancialCentersSegment
Segment Reporting [Abstract]
Number of principal reporting segments | Segment	2
Bank operated Business Financial Centers, number	40
Bank operated Commercial Banking Centers, number	7
Consideration of Business Financial and Commercial Banking Centers | Segment	1

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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income, including loan fees	$ 67,731	$ 65,295	$ 196,426	$ 187,573
Credit for funds provided	0	0	0	0
Total interest income	67,731	65,295	196,426	187,573
Interest expense	1,814	4,057	6,742	12,234
Charge for funds used	0	0	0	0
Total interest expense	1,814	4,057	6,742	12,234
Net interest income	65,917	61,238	189,684	175,339
(Recapture of) Provision for Loan Losses	(2,500)	(1,000)	(4,500)	(16,100)
Net interest income after recapture of provision for loan losses	68,417	62,238	194,184	191,439
Noninterest income	8,413	8,009	24,769	26,557
Noninterest expense	32,742	32,481	94,877	94,962
Debt termination expense	0	0	13,870	0
Earnings before income taxes	44,088	37,766	110,206	123,034
Segment assets	7,626,462	7,422,849	7,626,462	7,422,849	$ 7,377,920
Operating Segments [Member] | Centers [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	36,998	35,384	108,179	103,158
Credit for funds provided	8,977	8,190	25,718	22,924
Total interest income	45,975	43,574	133,897	126,082
Interest expense	1,654	1,637	4,945	4,835
Charge for funds used	1,088	1,061	3,207	2,978
Total interest expense	2,742	2,698	8,152	7,813
Net interest income	43,233	40,876	125,745	118,269
(Recapture of) Provision for Loan Losses	0	0	0	0
Net interest income after recapture of provision for loan losses	43,233	40,876	125,745	118,269
Noninterest income	5,276	5,288	15,662	15,232
Noninterest expense	12,496	12,221	36,604	35,469
Debt termination expense	0	0	0	0
Earnings before income taxes	36,013	33,943	104,803	98,032
Segment assets	6,419,264	6,086,641	6,419,264	6,086,641
Operating Segments [Member] | Treasury [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	18,927	18,397	56,792	52,504
Credit for funds provided	0	0	0	0
Total interest income	18,927	18,397	56,792	52,504
Interest expense	58	2,415	1,520	7,178
Charge for funds used	15,983	14,374	46,230	40,607
Total interest expense	16,041	16,789	47,750	47,785
Net interest income	2,886	1,608	9,042	4,719
(Recapture of) Provision for Loan Losses	0	0	0	0
Net interest income after recapture of provision for loan losses	2,886	1,608	9,042	4,719
Noninterest income	(22)	0	(22)	0
Noninterest expense	219	186	643	564
Debt termination expense	0	0	13,870	0
Earnings before income taxes	2,645	1,422	(5,493)	4,155
Segment assets	3,505,392	3,431,467	3,505,392	3,431,467
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	11,806	11,514	31,455	31,911
Credit for funds provided	13,249	12,037	38,914	34,914
Total interest income	25,055	23,551	70,369	66,825
Interest expense	102	5	277	221
Charge for funds used	5,155	4,792	15,195	14,253
Total interest expense	5,257	4,797	15,472	14,474
Net interest income	19,798	18,754	54,897	52,351
(Recapture of) Provision for Loan Losses	(2,500)	(1,000)	(4,500)	(16,100)
Net interest income after recapture of provision for loan losses	22,298	19,754	59,397	68,451
Noninterest income	3,159	2,721	9,129	11,325
Noninterest expense	20,027	20,074	57,630	58,929
Debt termination expense	0	0	0	0
Earnings before income taxes	5,430	2,401	10,896	20,847
Segment assets	809,514	792,404	809,514	792,404
Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	0	0	0	0
Credit for funds provided	(22,226)	(20,227)	(64,632)	(57,838)
Total interest income	(22,226)	(20,227)	(64,632)	(57,838)
Interest expense	0	0	0	0
Charge for funds used	(22,226)	(20,227)	(64,632)	(57,838)
Total interest expense	(22,226)	(20,227)	(64,632)	(57,838)
Net interest income	0	0	0	0
(Recapture of) Provision for Loan Losses	0	0	0	0
Net interest income after recapture of provision for loan losses	0	0	0	0
Noninterest income	0	0	0	0
Noninterest expense	0	0	0	0
Debt termination expense	0	0	0	0
Earnings before income taxes	0	0	0	0
Segment assets	$ (3,107,708)	$ (2,887,663)	$ (3,107,708)	$ (2,887,663)

Derivative Financial Instrume58

Derivative Financial Instruments - Additional Information (Detail)	Sep. 30, 2015USD ($)Agreement	Dec. 31, 2014USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets and liabilities offset in balance sheet	$ 0
Total notional amount of the Company's swaps	$ 185,000,000	$ 197,400,000
Interest-rate Swap Agreements with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest-rate swap agreements | Agreement	75

Derivative Financial Instrume59

Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 11,694	$ 10,080
Other liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	11,694	10,080
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	11,694	10,080
Other Assets [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 11,694	$ 10,080

Derivative Financial Instrume60

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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 0	$ 0	$ 199	$ 0
Interest Rate Swaps [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain Recognized in Income on Derivative Instruments	$ 0	$ 0	$ 199	$ 0

Other Comprehensive Income (L61

Other Comprehensive Income (Loss) - Summary of Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ 12,318	$ (10,291)	$ (382)	$ 47,272
Net change in fair value recorded in accumulated OCI, Tax effect	5,175	(4,322)	(159)	19,854
Net change in fair value recorded in accumulated OCI, After-tax	7,143	(5,969)	(223)	27,418
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax	6,690	0	6,690	0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect	2,808	0	2,808	0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax	3,882	0	3,882	0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax	(334)	0	(334)	0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect	(140)	0	(140)	0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax	(194)	0	(194)	0
Net realized loss reclassified into earnings, Before-Tax	22	0	22	0
Net realized loss reclassified into earnings, Tax Effect	9	0	9	0
Net realized loss reclassified into earnings, After-Tax	13	0	13	0
Net change, Before-tax	18,696	(10,291)	5,996	47,272
Net change, Tax effect	7,852	(4,322)	2,518	19,854
Net change, After-tax	$ 10,844	$ (5,969)	$ 3,478	$ 27,418

Other Comprehensive Income (L62

Other Comprehensive Income (Loss) - Summary of Change in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Beginning balance			$ 31,075	$ (9,330)
Net change in fair value recorded in accumulated OCI			3,465	27,418
Net realized loss reclassified into earnings	$ 13	$ 0	13	0
Ending balance	$ 34,553	$ 18,088	$ 34,553	$ 18,088

Balance Sheet Offsetting - Sche

Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 621,868	$ 573,827
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	(120)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	621,868	573,707
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	120
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(690,434)	(641,312)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(68,566)	(67,485)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	610,174	563,627
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	610,174	563,627
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	(673,853)	(624,578)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(63,679)	(60,951)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	11,694	10,080
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	11,694	10,080
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	11,694	10,080
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	11,694	10,080
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	11,694	10,080
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	11,694	10,080
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	11,694	10,200
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	(120)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	11,694	10,080
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	120
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(16,581)	(16,734)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (4,887)	$ (6,534)