National Bank (NBHC) 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	Nov. 09, 2015
Document 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	NBHC
Entity Registrant Name	National Bank Holdings Corp
Entity Central Index Key	1,475,841
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		30,327,598

Consolidated Statements of Fina

Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 58,859	$ 61,461
Due from banks	84,204	185,463
Interest bearing bank deposits	10,093	10,055
Cash and cash equivalents	153,156	256,979
Securities purchased under agreements to resell	50,000
Investment securities available-for-sale (at fair value)	1,244,267	1,479,214
Investment securities held-to-maturity (fair value of $450,148 and $534,637 at September 30, 2015 and December 31, 2014, respectively)	445,069	530,590
Non-marketable securities	27,049	27,045
Loans (including covered loans of $155,056 and $193,697 at September 30, 2015 and December 31, 2014, respectively)	2,523,128	2,162,409
Allowance for loan losses	(23,827)	(17,613)
Loans, net	2,499,301	2,144,796
Loans held for sale	11,246	5,146
Federal Deposit Insurance Corporation (“FDIC”) indemnification asset, net	18,155	39,082
Other real estate owned	19,034	29,120
Premises and equipment, net	104,452	106,341
Goodwill	59,630	59,630
Intangible assets, net	13,799	16,883
Other assets	142,891	124,820
Total assets	4,788,049	4,819,646
Liabilities:
Non-interest bearing demand deposits	820,269	732,580
Interest bearing demand deposits	408,341	386,121
Savings and money market	1,390,054	1,290,436
Time deposits	1,255,973	1,357,051
Total deposits	3,874,637	3,766,188
Securities sold under agreements to repurchase	169,488	133,552
Federal Home Loan Banks advances	40,000	40,000
Due to FDIC	38,712	42,011
Other liabilities	44,019	43,320
Total liabilities	4,166,856	4,025,071
Shareholders’ equity:
Common stock, par value $0.01 per share: 400,000,000 shares authorized; 52,223,460 and 52,289,347 shares issued; 30,318,684 and 38,884,953 shares outstanding at September 30, 2015 and December 31, 2014, respectively	513	512
Additional paid in capital	995,440	993,212
Retained earnings	36,778	40,528
Treasury stock of 21,104,160 and 12,383,109 shares at September 30, 2015 and December 31, 2014, respectively, at cost	(420,274)	(245,516)
Accumulated other comprehensive income, net of tax	8,736	5,839
Total shareholders’ equity	621,193	794,575
Total liabilities and shareholders’ equity	$ 4,788,049	$ 4,819,646

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 450,148	$ 534,637
Loans receivable, net - covered	$ 155,056	$ 193,697
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	400,000,000	400,000,000
Common Stock, shares issued	52,380,124	52,223,460
Common Stock, shares outstanding	30,318,684	38,884,953
Treasury stock, shares	21,104,160	12,383,109

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest and dividend income:
Interest and fees on loans	$ 32,650	$ 33,403	$ 96,797	$ 99,704
Interest and dividends on investment securities	9,144	11,749	29,480	37,523
Dividends on non-marketable securities	319	245	963	904
Interest on interest-bearing bank deposits	198	95	675	251
Total interest and dividend income	42,311	45,492	127,915	138,382
Interest expense:
Interest on deposits	3,424	3,563	10,274	10,625
Interest on borrowings	205	34	625	92
Total interest expense	3,629	3,597	10,899	10,717
Net interest income before provision for loan losses	38,682	41,895	117,016	127,665
Provision for loan losses	3,710	1,515	7,021	4,944
Net interest income after provision for loan losses	34,972	40,380	109,995	122,721
Non-interest income:
FDIC indemnification asset amortization	(5,798)	(6,252)	(20,751)	(19,819)
FDIC loss sharing income (expense)	(3)	(943)	325	(2,549)
Service charges	3,953	4,148	10,977	11,558
Bank card fees	2,808	2,615	8,057	7,548
Gain on sales of mortgages, net	628	264	1,574	674
Bank-owned life insurance income	421		1,217
Other non-interest income	475	836	2,568	2,557
Bargain purchase gain	1,048		1,048
Gain on previously charged-off acquired loans	46	147	143	675
OREO related write-ups and other income	183	799	871	2,777
Total non-interest income	3,761	1,614	6,029	3,421
Non-interest expense:
Salaries and benefits	20,454	21,058	61,687	62,260
Occupancy and equipment	6,098	6,155	18,256	18,838
Telecommunications and data processing	2,933	2,848	8,573	8,978
Marketing and business development	1,016	757	3,277	3,542
FDIC deposit insurance	1,031	1,029	3,104	3,109
ATM/debit card expenses	924	799	2,470	2,312
Professional fees	924	854	3,006	2,180
Other non-interest expense	2,831	2,540	7,566	7,698
Other real estate owned expenses	468	594	456	3,629
Problem loan expenses	1,115	1,267	2,637	3,034
Intangible asset amortization	1,359	1,336	4,031	4,008
Gain from the change in fair value of warrant liability	(476)	(1,256)	(358)	(2,734)
Banking center closure related expenses			1,089
Total non-interest expense	38,677	37,981	115,794	116,854
Income before income taxes	56	4,013	230	9,288
Income tax (benefit) expense	(1,580)	676	(1,311)	2,391
Net income	$ 1,636	$ 3,337	$ 1,541	$ 6,897
Income per share—basic (in dollars per share)	$ 0.05	$ 0.08	$ 0.04	$ 0.16
Income per share—diluted (in dollars per share)	$ 0.05	$ 0.08	$ 0.04	$ 0.16
Weighted average number of common shares outstanding:
Basic (Shares)	32,681,181	41,837,485	35,605,180	43,403,791
Diluted (Shares)	32,762,516	41,841,685	35,605,701	43,423,273

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,636	$ 3,337	$ 1,541	$ 6,897
Securities available-for-sale:
Net unrealized gains (losses) arising during the period, net of tax (expense) benefit of ($2,981) and $1,480 for the three months ended September 30, 2015 and 2014, respectively; and net of tax expense of ($2,981) and ($6,824) for the nine months ended, September 30, 2015 and 2014, respectively.	4,848	(2,407)	4,848	11,099
Less: amortization of net unrealized holding gains to income, net of tax benefit of $342 and $475 for the three months ended September 30, 2015 and 2014, respectively; and net of tax benefit of $1,120 and $2,943 for the nine months ended September 30, 2015 and 2014, respectively.	(556)	(774)	(1,951)	(2,447)
Other comprehensive income (loss)	4,292	(3,181)	2,897	8,652
Comprehensive income	$ 5,928	$ 156	$ 4,438	$ 15,549

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Tax expense on net unrealized gains arising during the period	$ (2,981)	$ 1,480	$ (2,981)	$ (6,824)
Tax benefit of amortization of net unrealized holding gains to income	$ 342	$ 475	$ 1,120	$ 1,505

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income, net [Member]	Total
Balance in the beginning at Dec. 31, 2013	$ 512	$ 990,216	$ 39,966	$ (126,146)	$ (6,756)	$ 897,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			6,897			6,897
Stock-based compensation		2,750				2,750
Issuance of stock under equity compensation plan		(368)				(368)
Excess tax benefit of stock-based compensation		(11)				(11)
Repurchase of shares				(100,084)		(100,084)
Dividends paid ($0.15 per share)			(6,666)			(6,666)
Other comprehensive income					8,652	8,652
Balance in the ending at Sep. 30, 2014	512	992,587	40,197	(226,230)	1,896	808,962
Balance in the beginning at Dec. 31, 2014	512	993,212	40,528	(245,516)	5,839	794,575
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,541			1,541
Stock-based compensation		2,514				2,514
Issuance of stock under purchase and equity compensation plans, including tax benefit of $8	1	(286)		290		5
Repurchase of shares				(175,048)		(175,048)
Dividends paid ($0.15 per share)			(5,291)			(5,291)
Other comprehensive income					2,897	2,897
Balance in the ending at Sep. 30, 2015	$ 513	$ 995,440	$ 36,778	$ (420,274)	$ 8,736	$ 621,193

Consolidated Statements of Cha8

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Tax benefit, issuance of stock under purchase and equity compensation plans	$ 8	$ 4
Common Stock Purchased	8,645,836	5,085,458
Dividends paid per share	$ 0.15	$ 0.15

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 1,541	$ 6,897
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	7,021	4,944
Depreciation and amortization	11,613	12,144
Current income tax receivable	(2,216)	20,364
Deferred income tax asset	(6,585)	(18,445)
Discount accretion, net of premium amortization on securities	3,229	3,828
Loan accretion	(38,073)	(48,978)
Net gains on sales of mortgage loans	(1,574)	(674)
Originations of loans held for sale, net of repayments	(78,760)	(29,622)
Proceeds from sales of loans held for sale	74,234	30,106
Bank-owned life insurance income	(1,217)
Amortization of indemnification asset	20,751	19,819
Gains on the sales of other real estate owned, net	(2,342)	(2,686)
Impairment on other real estate owned	799	1,789
Impairment on fixed assets related to banking center closures	1,089
Loss (gain) on sales of fixed assets	6	(123)
Bargain purchase gain	(1,048)
Stock-based compensation	2,514	2,750
Decrease in due to FDIC, net	(3,299)	(6,762)
Increase in other assets	(2,109)	(740)
(Decrease) increase in other liabilities	(799)	19,525
Net cash (used in) provided by operating activities	(15,225)	14,136
Cash flows from investing activities:
Proceeds from redemption of FHLB stock	493	633
(Purchase of) proceeds from FRB stock	(238)	9,390
Proceeds from maturities of investment securities held-to-maturity	81,877	80,052
Proceeds from maturities of investment securities available-for-sale	242,159	246,422
Proceeds from sales of investment securities available-for-sale	29,748
Increase in securities purchased under agreement to resell	(50,000)
Net increase in loans	(272,019)	(274,575)
Purchases of premises and equipment, net	(3,623)	(894)
Purchase of bank-owned life insurance		(40,000)
Proceeds from sales of loans	11,702	3,607
Proceeds from sales of other real estate owned	14,260	27,656
Increase in FDIC indemnification asset	176	215
Net cash activity from acquisitions	22,832
Net cash provided by investing activities	77,367	52,506
Cash flows from financing activities:
Net decrease in deposits	(21,694)	(40,851)
Increase in repurchase agreements	35,936	10,399
Issuance of stock under purchase and equity compensation plans	(148)	(383)
Proceeds from exercise of stock options	160
Excess tax benefit on stock-based compensation	8	4
Payment of dividends	(5,179)	(6,528)
Repurchases of shares	(175,048)	(100,084)
Net cash used in financing activities	(165,965)	(137,443)
Decrease in cash and cash equivalents	(103,823)	(70,801)
Cash and cash equivalents at beginning of the year	256,979	189,460
Cash and cash equivalents at end of period	153,156	118,659
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	9,913	10,168
Net tax payments	7,467	489
Supplemental schedule of non-cash investing activities:
Loans transferred to other real estate owned at fair value	1,143	2,519
FDIC submissions transferred to (other liabilities) other assets	$ (2,644)	181
Loans purchased but not settled		$ 29,906

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Note 1 Basis of Presentation National Bank Holdings Corporation ("NBHC" or the "Company") is a bank holding company that was incorporated in the State of Delaware in June 2009 with the intent to acquire and operate financial services franchises and other complementary businesses in targeted markets. The Company is headquartered immediately south of Denver, in Greenwood Village, Colorado, and its primary operations are conducted through its wholly owned subsidiary, NBH Bank, N.A. (the "Bank"). The Company provides a variety of banking products to both commercial and consumer clients through a network of 97 banking centers located in Colorado, the greater Kansas City area and Texas, and through on-line and mobile banking products. The accompanying interim unaudited consolidated financial statements serve to update the National Bank Holdings Corporation Annual Report on Form 10-K for the year ended December 31, 2014 and include the accounts of the Company and the Bank. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and where applicable, with general practices in the banking industry or guidelines prescribed by bank regulatory agencies. However, they may not include all information and notes necessary to constitute a complete set of financial statements under GAAP applicable to annual periods and accordingly should be read in conjunction with the financial information contained in the Company's most recent Form 10-K. The unaudited consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the results presented. All such adjustments are of a normal recurring nature. All significant intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications of prior years' amounts are made whenever necessary to conform to current period presentation. The results of operations for the interim period is not necessarily indicative of the results that may be expected for the full year or any other interim period. All amounts are in thousands, except share data, or as otherwise noted. GAAP requires management to make estimates that affect the reported amounts of assets, liabilities, revenues and expenses, and disclosures of contingent assets and liabilities. By their nature, estimates are based on judgment and available information. Management has made significant estimates in certain areas, such as the amount and timing of expected cash flows from assets, the valuation of the FDIC indemnification asset and clawback liability, the valuation of other real estate owned (“OREO”), the fair value adjustments on assets acquired and liabilities assumed, the valuation of core deposit intangible assets, the evaluation of investment securities for other-than-temporary impairment (“OTTI”), the valuation of stock-based compensation, the fair values of financial instruments, the allowance for loan losses (“ALL”), and contingent liabilities. Because of the inherent uncertainties associated with any estimation process and future changes in market and economic conditions, it is possible that actual results could differ significantly from these estimates. The Company's significant accounting policies followed in the preparation of the unaudited consolidated financial statements are disclosed in note 2 of the audited financial statements and notes for the year ended December 31, 2014 and are contained in the Company's Annual Report on Form 10-K. There have not been any significant changes to the application of significant accounting policies since December 31, 2014, with the exception of the following: Income taxes - For the three and nine months ended September 30, 2015, the Company has utilized the discrete effective tax rate method, as allowed by Accounting Standards Codification (“ASC”) 740-270-30-18, “Income Taxes-Interim Reporting,” to calculate its interim income tax provision. The discrete method is applied when the application of the estimated annual effective tax rate is impractical because it is not possible to reliably estimate the annual effective tax rate. The discrete method treats the year to date period as if it was the annual period and determines the income tax expense or benefit on that basis. The Company believes that, at this time, the use of this discrete method is more appropriate than the annual effective tax rate method as the estimated annual effective tax rate method is not reliable due to (1) the levels of tax-exempt income in relation to pre-tax income, (2) the impact of the warrant liability which is non-taxable and (3) the impact and variability of FDIC Indemnification amortization on our pre-tax income. The income tax rate for the three and nine months ended September 30, 2015 was (2,821.4)% and (570.0)% , respectively, based on application of the discrete approach. The quarterly tax rate differs from the federal statutory rate primarily due to interest income from tax-exempt lending, tax-exempt bank-owned life insurance income, non-taxable warrant liability fair value adjustment and the relationship of each of these items to pre-tax income. The three and nine month tax rates for 2015 are lower than prior period tax rates primarily because of the lower levels of pre-tax income in relation to the larger amounts of non-taxable income. Increased amounts from tax-exempt lending, bank-owned life insurance income, the change in the fair value of the warrant liability, and the bargain purchase gain for financial reporting purposes together exceeded the amount of pre-tax income and generated the tax benefit for the three and nine months ended September 30, 2015. We are currently in an open IRS examination for the tax year 2012.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Recent Accounting Pronouncements	Note 2 Recent Accounting Pronouncements Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure - In January 2014, the FASB issued Accounting Standards Update ("ASU") 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure . This update amends ASC Topic 310-40 and clarifies that an “in substance repossession or foreclosure” has occurred upon the creditor obtaining either legal title to the property upon completion of foreclosure, or the borrower conveying all interest in the property through completion of a deed in lieu of foreclosure. Upon occurrence, the creditor derecognizes the loan receivable and recognizes the collateralized real estate property. The amendments in the ASU became effective for the Company for interim and annual periods beginning after December 15, 2014. Early adoption was permitted. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity. Revenue from Contracts with Customers - In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." This update supersedes revenue recognition requirements in Topic 605, Revenue Recognition , including most industry-specific revenue recognition guidance in the FASB Accounting Standards Codification. The new guidance stipulates that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides specific steps that entities should apply in order to achieve this principle. In July 2015, the FASB voted to approve deferring the effective date by one year (i.e., interim and annual reporting periods beginning after December 15, 2017). Early adoption is permitted, but not before the original effective date (i.e., interim and annual reporting periods beginning after December 15, 2016). The Company is in the process of evaluating the impact of the ASU's adoption on the Company's consolidated financial statements. Simplifying the Accounting for Measurement-Period Adjustments - In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments . This update amends ASC Topic 805-10 and clarifies that an acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this ASU will become effective for the Company for interim and annual periods beginning after December 15, 2015. Early adoption is permitted. The Company adopted this ASU on September 30, 2015 with no material impact to the consolidated financial statements.

Acquisition Activities

Acquisition Activities	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisition Activities	Note 3 Acquisition Activities On August 1, 2015, the Company completed the acquisition of Pine River Bank Corporation (“Pine River”) for $9.5 million cash. The Company determined that this acquisition constitutes a business combination as defined in ASC Topic 805, Business Combinations . Accordingly, as of the date of the acquisition, the Company recorded the assets acquired and liabilities assumed at fair value. The Company determined fair values in accordance with the guidance provided in ASC Topic 820, Fair Value Measurements and Disclosures . Fair value is established by discounting the expected future cash flows with a market discount rate for like maturities and risk instruments. The estimation of expected future cash flows, market conditions and other future events and actual results could differ materially. The determination of the initial fair values of fixed assets, loans, and OREO involve a high degree of judgment and complexity. The Company has made the determination of fair value using the best information available at the time; however, the assumptions used are subject to change and if changed, could have a material effect on the Company's financial position and results of operations. The table below summarizes the net assets acquired (at fair value) and consideration transferred in connection with the Pine River acquisition: Assets: Cash and due from banks $ Investment securities available-for-sale (at fair value) Non-marketable securities Loans, net Other real estate owned Premises and equipment, net Core deposit intangible asset Other assets Total assets acquired $ Liabilities: Deposits: Non-interest bearing demand deposits $ Interest bearing demand deposits Savings and money market Time deposits Total deposits Other liabilities Total liabilities assumed $ Identifiable net assets acquired $ Consideration: Cash $ Gain on bargain purchase $ In connection with the Pine River acquisition, the Company recognized approximately $1.0 million of bargain purchase gain and a $0.9 million core deposit intangible. The core deposit intangible will be amortized on a straight-line basis over seven years. The bargain purchase gain of $1.0 million, recorded at the date of acquisition, represents the amount by which the acquisition-date fair value of the net identifiable assets acquired exceeded the fair value of the consideration transferred. The fair value of the acquired assets and liabilities noted in the table may change during the provisional period, which may last up to twelve months subsequent to the acquisition date. The Company may obtain additional information to refine the valuation of the acquired assets and liabilities and adjust the recorded fair value, although such adjustments are not expected to be significant. Adjustments recorded to the acquired assets and liabilities will be applied prospectively in accordance with ASU 2015-16. At the date of acquisition, none of the loans were accounted for under the guidance of ASC Topic 310-30, and the gross contractual amounts receivable, inclusive of all principal and interest, was $79.0 million. The Company’s best estimate of the contractual cash flows for loans not expected to be collected was $1.4 million and recorded fair value was $64.3 million. The results of Pine River are included in the results of the Company subsequent to the acquisition date. Included in other non-interest expenses in the Company’s consolidated statements of operations for the nine months ending September 30, 2015 were $0.5 million of one-time expenses related to the acquisition of Pine River. The following pro forma information combines the historical results of Pine River and the Company. The pro forma financial information does not include the potential impacts of possible business model changes, current market conditions, revenue enhancements, expense efficiencies, or other factors. The pro forma information below reflects adjustments made to exclude the impact of the bargain purchase gain of $1.0 million, acquisition-related expenses of $0.5 million, amortization and accretion of purchase discounts and premiums of $75 thousand, and amortization of acquired identifiable intangibles of $23 thousand during the nine month period ended September 30, 2015. The pro forma information is theoretical in nature and not necessarily indicative of future consolidated results of operations of the Company or the consolidated results of operations which would have resulted had the Company acquired Pine River during the periods presented. If the Pine River acquisition had been completed on January 1, 2014, total revenue would have been approximately $136.7 million and $146.2 million for the nine months ended September 30, 2015 and September 30, 2014, respectively. Net income would have been approximately $0.9 million and $6.6 million, respectively, for the same periods. Basic and dilutive earnings per share would have been $0.03 and $0.15 , respectively, for the same periods. The Company has determined that it is impractical to report the amounts of revenue and earnings of legacy Pine River since the acquisition date due to the integration of operations shortly after the acquisition date. Accordingly, reliable and separate complete revenue and earnings information is no longer available. In addition, such amounts would require significant estimates related to the proper allocation of merger cost savings that cannot be objectively made.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 4 Investment Securities The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $1.7 billion at September 30, 2015 and were comprised of $1.2 billion of available-for-sale securities and $0.5 billion of held-to-maturity securities. At December 31, 2014, investment securities totaled $2.0 billion and were comprised of $1.5 billion of available-for-sale securities and $0.5 billion of held-to-maturity securities. Available-for-sale Available-for-sale investment securities are summarized as follows as of the dates indicated: September 30, 2015 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ — $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Other securities — — Total $ $ $ $ December 31, 2014 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Other securities — — Total $ $ $ $ At September 30, 2015 and December 31, 2014, mortgage -backed securities represented primarily all of the Company’s available-for-sale investment portfolio and all mortgage-backed securities were backed by government sponsored enterprises (“GSE”) collateral such as Federal Home Loan Mortgage Corporation (“FHLMC”) and Federal National Mortgage Association (“FNMA”), and the government sponsored agency Government National Mortgage Association (“GNMA”). The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: September 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ — $ — $ — $ — Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ — $ — $ $ $ $ December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ — $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total $ $ $ $ $ Management evaluated all of the available-for-sale securities in an unrealized loss position and concluded that no other-than-temporary impairment existed at September 30, 2015 or December 31, 2014. The unrealized losses in the Company's investments issued or guaranteed by U.S. government agencies or sponsored enterprises at September 30, 2015 were caused by changes in interest rates. The portfolio included 52 securities, having an aggregate fair value of $0.6 billion, which were in an unrealized loss position at September 30, 2015, compared to 62 securities, with a fair value of $0.8 billion, at December 31, 2014. The Company has no intention to sell these securities before recovery of their amortized cost and believes it will not be required to sell the securities before the recovery of their amortized cost. Available-for-sale securities acquired from the Pine River acquisition totaled $31.9 million at the date of acquisition. Shortly after the acquisition date, the Company sold $29.8 million of the acquired securities and recorded no gain or loss. Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase and to secure borrowing capacity at the Federal Reserve Bank, if needed. The fair value of available-for-sale investment securities pledged as collateral totaled $0.3 billion at September 30, 2015 and $0.3 billion at December 31, 2014. The increase in pledged available-for-sale investment securities was primarily attributable to an increase in average deposit account balances and client repurchase account balances during the nine months ended September 30, 2015. Certain investment securities may also be pledged as collateral for the line of credit at the Federal Home Loan Bank ("FHLB") of Des Moines; however, no investment securities were pledged for this purpose at September 30, 2015 or December 31, 2014. Mortgage-backed securities do not have a single maturity date and actual maturities may differ from contractual maturities depending on the repayment characteristics and experience of the underlying financial instruments. The estimated weighted average life of the available-for-sale mortgage-backed securities portfolio was 3.5 years as of September 30, 2015 and 3.5 years as of December 31, 2014. This estimate is based on assumptions and actual results may differ. Other securities of $1.7 million have a maturity date between October 2015 and October 2017. Other securities of $0.8 million have no stated contractual maturity date as of September 30, 2015. Held-to-maturity At September 30, 2015 and December 31, 2014, the Company held $445.1 million and $530.6 million of held-to-maturity investment securities, respectively. Held-to-maturity investment securities are summarized as follows as of the dates indicated: September 30, 2015 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total investment securities held-to-maturity $ $ $ $ December 31, 2014 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total investment securities held-to-maturity $ $ $ $ The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: September 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ $ $ $ $ $ December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ — $ — $ $ $ $ The portfolio included 7 securities, having an aggregate fair value of $50.3 million, which were in an unrealized loss position at September 30, 2015, compared to 12 securities, with a fair value of $110.3 million, at December 31, 2014. Management evaluated all of the held-to-maturity securities in an unrealized loss position and concluded that no other-than-temporary impairment existed at September 30, 2015 or December 31, 2014. The unrealized losses in the Company's investments issued or guaranteed by U.S. government agencies or sponsored enterprises at September 30, 2015 were caused by changes in interest rates. The Company has no intention to sell these securities before recovery of their amortized cost and believes it will not be required to sell the securities before the recovery of their amortized cost. The carrying value of held-to-maturity investment securities pledged as collateral totaled $120.1 million and $88.3 million at September 30, 2015 and December 31, 2014, respectively. Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments. The estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio as of September 30, 2015 and December 31, 2014 was 3.5 years and 3.4 years, respectively. This estimate is based on assumptions and actual results may differ.

Loans

Loans	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans	Note 5 Loans The loan portfolio is comprised of loans originated by the Company and loans that were acquired in connection with the Company’s acquisitions of Bank of Choice and Community Banks of Colorado in 2011, Hillcrest Bank and Bank Midwest in 2010, and Pine River in 2015. The loans acquired from Pine River totaled $64.3 million and were accounted for in accordance with ASC 805, and classified as non-covered, non 310-30 loans. The majority of the loans acquired in the Hillcrest Bank and Community Banks of Colorado transactions are covered by loss sharing agreements with the FDIC. Covered loans are presented separately from non-covered loans due to the FDIC loss sharing agreements associated with these loans. Covered loans comprised 6.1% of the total loan portfolio at September 30, 2015, compared to 9.0% of the total loan portfolio at December 31, 2014. The table below shows the loan portfolio composition including carrying value by segment of loans accounted for under ASC Topic 310-30, Receivables—Loans and Debt Securities Acquired with Deteriorated Credit Quality and loans not accounted for under this guidance, which includes our originated loans. The table also shows the amounts covered by the FDIC loss sharing agreements as of September 30, 2015 and December 31, 2014. The carrying value of loans are net of discounts, fees and costs on loans excluded from ASC 310-30 of $8.6 million and $10.5 million as of September 30, 2015 and December 31, 2014, respectively: September 30, 2015 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ $ $ % Agriculture Commercial real estate Residential real estate Consumer Total $ $ $ % Covered $ $ $ % Non-covered Total $ $ $ % December 31, 2014 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ $ $ % Agriculture Commercial real estate Residential real estate Consumer Total $ $ $ % Covered $ $ $ % Non-covered Total $ $ $ % Included in commercial loans are $147.5 million and $161.8 million of energy-related loans at September 30, 2015 and December 31, 2014, respectively. Energy prices declined significantly during 2014 and remain at cyclically low levels; prolonged or further pricing pressure could increase stress on energy clients and ultimately the credit quality of this portfolio. However, loans have been structured to mitigate credit loss under a variety of circumstances, including the impact on energy loans as a result of depressed oil prices for a sustained period. Also included in the commercial segment are tax exempt loans totaling $311.0 million and $112.6 million at September 30, 2015 and December 31, 2014, respectively. Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. Pooled loans accounted for under ASC 310-30 that are 90 days or more past due and still accreting are generally considered to be performing and are included in loans 90 days or more past due and still accruing. Non-accrual loans include troubled debt restructurings on non-accrual status. Total non-accrual loans excluded from the scope of ASC 310-30 totaled $28.6 million and $10.8 million at September 30, 2015 and December 31, 2014, respectively. Loan delinquency for all loans is shown in the following tables at September 30, 2015 and December 31, 2014, respectively: Total Loans September 30, 2015 Loans > 90 60-89 Greater days past 30-59 days than 90 due and days past past days past Total past Total still Non- due due due due Current loans accruing accrual Loans excluded from ASC 310-30 Commercial $ $ $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied — — — Non owner-occupied — — Total commercial real estate — — Residential real estate Senior lien Junior lien Total residential real estate Consumer — — Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Covered loans excluded from ASC 310-30 $ — $ — $ $ $ $ $ — $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ — $ $ $ $ $ $ — Agriculture — Commercial real estate — — Residential real estate — — Consumer — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Covered loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Non-covered loans accounted for under ASC 310-30 — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Total loans $ $ $ $ $ $ $ $ Covered loans $ $ $ $ $ $ $ $ Non-covered loans Total loans $ $ $ $ $ $ $ $ Total Loans December 31, 2014 Loans > 90 60-89 Greater days past 30-59 days than 90 due and days past past days past Total past Total still Non- due due due due Current loans accruing accrual Loans excluded from ASC 310-30 Commercial $ $ $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — — — — Acquisition/development — — — — Multifamily — — — — — Owner-occupied — Non owner-occupied — — Total commercial real estate Residential real estate Senior lien — Junior lien — Total residential real estate — Consumer Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ — $ $ $ $ $ $ — Agriculture — — — Commercial real estate — Residential real estate — Consumer — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Covered loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Non-covered loans accounted for under ASC 310-30 — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Total loans $ $ $ $ $ $ $ $ Covered loans $ $ $ $ $ $ $ $ Non-covered loans Total loans $ $ $ $ $ $ $ $ The Company's commercial substandard loans excluded from ASC 310-30 totaled $48.9 million and $19.3 million at September 30, 2015 and December 31, 2014, respectively. The increase was primarily due to four loan relationships totaling $28.8 million at September 30, 2015. Migration to special mention and substandard ratings during 2015 has been driven by a small number of agricultural clients, pressure in the energy sector, and isolated weakening in a small number of commercial and industrial clients. Two of these substandard loans were energy related and totaled $12.0 million at September 30, 2015. Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows as of September 30, 2015 and December 31, 2014, respectively: Total Loans September 30, 2015 Special Pass mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Construction — Acquisition/development — — — Multifamily — — — Owner-occupied — Non owner-occupied Total commercial real estate Residential real estate Senior lien Junior lien — Total residential real estate Consumer — Total loans excluded from ASC 310-30 $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ $ $ — $ Agriculture — Commercial real estate Residential real estate — Consumer — Total loans accounted for under ASC 310-30 $ $ $ $ $ Covered loans accounted for under ASC 310-30 $ $ $ $ $ Non-covered loans accounted for under ASC 310-30 — Total loans accounted for under ASC 310-30 $ $ $ $ $ Total loans $ $ $ $ $ Total covered $ $ $ $ $ Total non-covered Total loans $ $ $ $ $ Total Loans December 31, 2014 Special Pass mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Construction — — — Acquisition/development — — — Multifamily — — — Owner-occupied — Non owner-occupied Total commercial real estate Residential real estate Senior lien Junior lien — — Total residential real estate Consumer — — Total loans excluded from ASC 310-30 $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Residential real estate — Consumer — Total loans accounted for under ASC 310-30 $ $ $ $ $ Covered loans accounted for under ASC 310-30 $ $ $ $ $ Non-covered loans accounted for under ASC 310-30 Total loans accounted for under ASC 310-30 $ $ $ $ $ Total loans $ $ $ $ $ Total covered $ $ $ $ $ Total non-covered Total loans $ $ $ $ $ Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due in accordance with the contractual terms of the loan agreement. Impaired loans are comprised of loans excluded from ASC 310-30 on non-accrual status, accruing troubled debt restructurings (“TDRs”), loans in the process of bankruptcy, and restructured loans that are in compliance with their modified terms for one year or longer and are current as to principal and interest payments. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral dependent loans. At September 30, 2015, the Company measured $9.9 million of impaired loans using discounted cash flows, the loan’s initial contractual effective interest rate and observable market valuations and $31.5 million of impaired loans based on the fair value of the collateral less selling costs. Impaired loans that individually were less than $250 thousand were measured through the general allowance reserves due to their relatively small size totaled $9.1 million and $8.9 million at September 30, 2015 and December 31, 2014, respectively. At September 30, 2015 and December 31, 2014, the Company’s recorded investments in impaired loans were $50.5 million and $32.1 million, respectively, of which $10.9 million and $11.1 million, respectively, were covered by loss sharing agreements, for the aforementioned periods. The increase in impaired loans during the nine months ended September 30, 2015, was primarily due to three relationships totaling $19.0 million that were deemed impaired during the period. All three of the relationships were in the commercial and industrial segment, were non-covered, and on non-accrual status at September 30, 2015. Impaired loans had a collective related allowance for loan losses allocated to them of $3.3 million and $0.3 million at September 30, 2015 and December 31, 2014, respectively. Additional information regarding impaired loans at September 30, 2015 and December 31, 2014 is set forth in the table below: Impaired Loans September 30, 2015 December 31, 2014 Allowance Allowance Unpaid for loan Unpaid for loan principal Recorded losses principal Recorded losses balance investment allocated balance investment allocated With no related allowance recorded: Commercial $ $ $ — $ $ $ — Agriculture — — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied — — Non-owner occupied — — — — Total commercial real estate — — Residential real estate Senior lien — — Junior lien — — — — — — Total residential real estate — — Consumer — — — — — — Total impaired loans with no related allowance recorded $ $ $ — $ $ $ — With a related allowance recorded: Commercial $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — Owner-occupied Non-owner occupied Total commercial real estate Residential real estate Senior lien Junior lien Total residential real estate Consumer Total impaired loans with a related allowance recorded $ $ $ $ $ $ Total impaired loans $ $ $ $ $ $ The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For nine months ended September 30, 2015 September 30, 2014 Average recorded investment Interest income recognized Average recorded investment Interest income recognized With no related allowance recorded: Commercial $ $ $ $ Agriculture — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — — — — Owner-occupied Non-owner occupied — — — Total commercial real estate Residential real estate Senior lien Junior lien — — — — Total residential real estate Consumer — — — — Total impaired loans with no related allowance recorded $ $ $ $ With a related allowance recorded: Commercial $ $ $ $ Agriculture — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — Owner-occupied Non-owner occupied Total commercial real estate Residential real estate Senior lien Junior lien Total residential real estate Consumer Total impaired loans with a related allowance recorded $ $ $ $ Total impaired loans $ $ $ $ Troubled debt restructurings It is the Company’s policy to review each prospective credit in order to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include restructuring a loan to provide a concession by the Company to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Additionally, if a borrower’s repayment obligation has been discharged by a court, and that debt has not been reaffirmed by the borrower, regardless of past due status, the loan is considered to be a TDR. At September 30, 2015 and December 31, 2014, the Company had $11.0 million and $19.3 million, respectively, of accruing TDRs that had been restructured from the original terms in order to facilitate repayment. Of these, $1.7 million and $9.8 million were covered by FDIC loss sharing agreements as of September 30, 2015 and December 31, 2014, respectively. Approximately $10.0 million of loans reported as TDRs at December 31, 2014 were in compliance with their modified terms at September 30, 2015, and therefore, are no longer reportable as TDRs at September 30, 2015. Non-accruing TDRs at September 30, 2015 and December 31, 2014 totaled $21.4 million and $7.0 million, respectively. Of these, $1.0 million and $1.2 million were covered by the FDIC loss sharing agreements as of September 30, 2015 and December 31, 2014, respectively. During the nine months ended September 30, 2015, the Company restructured fourteen loans with a recorded investment of $20.4 million to facilitate repayment. Substantially all of the loan modifications were a reduction of the principal payment, a reduction in interest rate, or an extension of term. Loan modifications to loans accounted for under ASC 310-30 are not considered TDRs. The table below provides additional information related to accruing TDRs at September 30, 2015 and December 31, 2014: Accruing TDRs September 30, 2015 Average year-to- Unfunded date Unpaid commitments Recorded recorded principal to fund investment investment balance TDRs Commercial $ $ $ $ Agriculture — Commercial real estate — Residential real estate — Consumer — Total $ $ $ $ Accruing TDRs December 31, 2014 Average year-to- Unfunded date Unpaid commitments Recorded recorded principal to fund investment investment balance TDRs Commercial $ $ $ $ Agriculture — Commercial real estate — Residential real estate Consumer — Total $ $ $ $ The following table summarizes the Company’s carrying value of non-accrual TDRs as of September 30, 2015 and December 31, 2014: Non - Accruing TDRs September 30, 2015 December 31, 2014 Covered Non-covered Covered Non-covered Commercial $ $ $ $ Agriculture Commercial real estate — — Residential real estate Consumer — — Total $ $ $ $ Accrual of interest is resumed on loans that were on non-accrual only after the loan has performed sufficiently. The Company had no TDRs that were modified within the past 12 months and had defaulted on their restructured terms during the nine months ended September 30, 2015. During the nine months ended September 30, 2014, the Company had three TDRs that had been modified within the past 12 months that defaulted on their restructured terms. The defaulted TDRs consisted of a commercial loan and two consumer loans totaling $37 thousand. For purposes of this disclosure, the Company considers “default” to mean 90 days or more past due on principal or interest. Loans accounted for under ASC Topic 310-30 Loan pools accounted for under ASC Topic 310-30 are periodically remeasured to determine expected future cash flows. In determining the expected cash flows, the timing of cash flows and prepayment assumptions for smaller homogeneous loans are based on statistical models that take into account factors such as the loan interest rate, credit profile of the borrowers, the years in which the loans were originated, and whether the loans are fixed or variable rate loans. Prepayments may be assumed on loans if circumstances specific to that loan warrant a prepayment assumption. The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the nine months ended September 30, 2015 and 2014: September 30, 2015 September 30, 2014 Accretable yield beginning balance $ $ Reclassification from non-accretable difference Reclassification to non-accretable difference Accretion Accretable yield ending balance $ $ Below is the composition of the net book value for loans accounted for under ASC 310-30 at September 30, 2015 and December 31, 2014: September 30, 2015 December 31, 2014 Contractual cash flows $ $ Non-accretable difference Accretable yield Loans accounted for under ASC 310-30 $ $

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Allowance for Loan Losses	Note 6 Allowance for Loan Losses The tables below detail the Company’s allowance for loan losses (“ALL”) and recorded investment in loans as of and for the three and nine months ended September 30, 2015 and 2014: Three months ended September 30, 2015 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries — Provision Non 310-30 ending balance ASC 310-30 beginning balance Charge-offs — — — — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Three months ended September 30, 2014 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries Provision Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — — — — Recoveries — — — — — — Provision (recoupment) — — — ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Nine months ended September 30, 2015 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs Recoveries Provision (recoupment) Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ $ $ $ $ $ Non 310-30 loans collectively evaluated for impairment ASC 310-30 loans — Total ending allowance balance $ $ $ $ $ $ Loans: Non 310-30 individually evaluated for impairment $ $ $ $ $ $ Non 310-30 collectively evaluated for impairment ASC 310-30 loans Total loans $ $ $ $ $ $ Nine months ended September 30, 2014 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries Provision (recoupment) Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ $ — $ $ $ $ Non 310-30 loans collectively evaluated for impairment ASC 310-30 loans — Total ending allowance balance $ $ $ $ $ $ Loans: Non 310-30 individually evaluated for impairment $ $ $ $ $ $ Non 310-30 collectively evaluated for impairment ASC 310-30 loans Total loans $ $ $ $ $ $ In evaluating the loan portfolio for an appropriate ALL level, non-impaired loans that were not accounted for under ASC 310-30 were grouped into segments based on broad characteristics such as primary use and underlying collateral. Within the segments, the portfolio was further disaggregated into classes of loans with similar attributes and risk characteristics for purposes of applying loss ratios and determining applicable subjective adjustments to the ALL. The application of subjective adjustments was based upon qualitative risk factors, including economic trends and conditions, industry conditions, asset quality, loss trends, lending management, portfolio growth and loan review/internal audit results. The Company had $0.1 million net charge-offs of non 310-30 loans during the three months ended September 30, 2015 and $0.8 million net charge-offs of non 310-30 loans during the nine months ended September 30, 2015. Credit quality remained at acceptable levels within the non 310-30 loan portfolio during the three and nine months ended September 30, 2015, and management's evaluation resulted in a provision for loan losses on the non 310-30 loans of $3.6 million and $6.9 million during the three and nine months ended September 30, 2015, respectively. During the nine months ended September 30, 2015, the Company re-estimated the expected cash flows of the loan pools accounted for under ASC 310-30. The re-measurement resulted in net provision of $110 thousand and $168 thousand, respectively, for the three and nine months ended September 30, 2015. The net provision was comprised primarily of a provision of $87 thousand in the agriculture segment during the three months ended September 30, 2015 and $231 thousand in the agriculture segment for the nine months ended September 30, 2015, and was offset by recoupments of $133 thousand in the commercial real estate segment during the nine months ended September 30, 2015. The Company charged off $0.5 million and $0.8 million, net of recoveries, of non ASC 310-30 loans during the three and nine months ended September 30, 2014, respectively. During the three and nine months ended September 30, 2014, a large commercial and industrial loan was added to non-accrual status, and through management's evaluation, resulted in a provision for loan losses on the non 310-30 loans of $1.7 million and $5.3 million, respectively. During the nine months ended September 30, 2014, the Company remeasured the expected cash flows of the loan pools accounted for under ASC 310-30 utilizing the same cash flow methodology used at the time of acquisition. The re-measurement resulted in a net recoupment of previous valuation allowances of $191 thousand and $335 thousand for the three and nine months ended September 30, 2014, respectively, which were comprised of recoupments of previous valuation allowances of $184 thousand during the three months ended September 30, 2014 in the agriculture segment and $226 thousand during the nine months ended September 30, 2014 in the commercial segment.

FDIC Indemnification Asset

FDIC Indemnification Asset	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
FDIC Indemnification Asset	Note 7 FDIC Indemnification Asset Under the terms of the purchase and assumption agreements with the FDIC with regard to the Hillcrest Bank and Community Banks of Colorado acquisitions, the Company is reimbursed for a portion of the losses incurred on covered assets. Covered assets may be resolved through repayment, short sale of the underlying collateral, the foreclosure on and sale of collateral, or the sale or charge-off of loans or OREO. Any gains or losses realized from the resolution of covered assets reduce or increase, respectively, the amount recoverable from the FDIC. Covered gains or losses that are incurred in excess of the expected reimbursements (which are reflected in the FDIC indemnification asset balance), are recognized in the consolidated statements of operations as FDIC loss sharing income (expense) in the period in which they occur. Below is a summary of the activity related to the FDIC indemnification asset during the nine months ended September 30, 2015 and 2014: For the nine months ended September 30, 2015 September 30, 2014 Balance at beginning of period $ $ Amortization FDIC portion of charge-offs exceeding fair value marks Changes for FDIC loss share submissions Balance at end of period $ $ The $20.8 million of amortization of the FDIC indemnification asset recognized during the nine months ended September 30, 2015 resulted from an overall increase in actual and expected cash flows of the underlying covered assets, resulting in lower expected reimbursements from the FDIC. The increase in overall expected cash flows from these underlying assets is reflected in increased accretion rates on covered loans and is being recognized over the expected remaining lives of the underlying covered loan pools as an adjustment to yield. The claims filed with the FDIC are subject to review and approval, including extensive audits by the FDIC or its assigned agents for compliance with the terms in the loss sharing agreements. During the nine months ended September 30, 2015, the Company paid a net $2.6 million to the FDIC. During the nine months ended September 30, 2014, the Company recognized $19.8 million of amortization on the FDIC indemnification asset. During the nine months ended September 30, 2014, the Company received a net $181 thousand from the FDIC .

Other Real Estate Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Other Real Estate Owned	Note 8 Other Real Estate Owned A summary of the activity in the OREO balances during the nine months ended September 30, 2015 and 2014 is as follows: For the nine months ended September 30, 2015 2014 Beginning balance $ $ Purchases through acquisition, at fair value — Transfers from loan portfolio, at fair value Impairments Sales Gain on sale of OREO, net Ending balance $ $ Of the $19.0 million of OREO at September 30, 2015, $11.4 million, or 60.0% , was covered by loss sharing agreements with the FDIC. At December 31, 2014, $18.5 million, or 63.4% , of the $29.1 million of OREO was covered by loss sharing agreements. Any losses on these assets are substantially offset by a corresponding change in the FDIC indemnification asset. At September 30, 2015 and December 31, 2014, OREO balances excluded $5.5 million and $8.1 million, respectively, of the Company’s minority interests in OREO, which are held by outside banks where the Company was not the lead bank and does not have a controlling interest. The Company maintains a receivable in other assets for these minority interests.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2015
Disclosure of Repurchase Agreements [Abstract]
Borrowings	Note 9 Borrowings As a member of the FHLB of Des Moines, the Bank has access to term financing from the FHLB. These borrowings are secured under an advance, pledge and securities agreement, which includes primarily real estate loans. Total advances at both September 30, 2015 and December 31, 2014 were $40.0 million. All of the outstanding advances have fixed interest rates and interest expense related to FHLB advances totaled $167 thousand and $498 thousand for the three and nine months ended September 30, 2015, respectively. More information about FHLB advances at September 30, 2015 is detailed in the table below: Maturity Year September 30, 2015 Rate 2016 $ % 2018 $ % 2020 $ %

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Regulatory Capital	Note 10 Regulatory Capital As a bank holding company, the Company is subject to regulatory capital adequacy requirements implemented by the Federal Reserve. In addition, the Office of the Comptroller of the Currency ("OCC") imposes capital adequacy requirements on our subsidiary bank. The federal banking agencies have risk-based capital adequacy regulations intended to provide a measure of capital adequacy that reflects the degree of risk associated with a banking organization’s operations. Under these regulations, assets are assigned to one of several risk categories, and nominal dollar amounts of assets and credit equivalent amounts of off-balance-sheet items are multiplied by a risk adjustment percentage for the category. The law requires federal bank regulatory agencies to take “prompt corrective action” with respect to FDIC-insured depository institutions that do not meet minimum capital requirements. A depository institution’s treatment for purposes of the prompt corrective action provisions will depend upon how its capital levels compare to various capital measures and certain other factors, as established by regulation. Under this system, the federal banking regulators have established five capital categories, well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized, in which all institutions are placed. The capital adequacy regulations require banks to maintain a common equity tier 1 capital ratio of 6.5% , a total tier 1 capital ratio of 8.0% , a total capital ratio of 10.0% , and a leverage ratio of 5.0% to be deemed “well capitalized.” Federal banking regulators are required to take various mandatory supervisory actions and are authorized to take other discretionary actions with respect to institutions in the three undercapitalized categories. The severity of the action depends upon the capital category in which the institution is placed. Generally, subject to a narrow exception, the banking regulator must appoint a receiver or conservator for an institution that is critically undercapitalized. Our regulatory capital ratios and those of the Bank are in excess of the levels established for “well-capitalized” institutions. In connection with the approval of the de novo charter for the Bank, the Company agreed to maintain capital levels of at least 10.0% tier 1 leverage ratio, 11.0% tier 1 risk-based capital ratio and 12.0% total risk-based capital ratio at our subsidiary bank. During 2015, the Bank received approval from the OCC under the OCC Operating Agreement to permanently reduce the Bank's capital by $86.0 million. As a result, the Bank distributed $86.0 million cash to the Company during 2015. On October 19, 2015, the operating agreement between the Bank and the OCC was terminated. The new Basel III rules, effective January 1, 2015, changed the components of regulatory capital and changed the way in which risk ratings are assigned to various categories of bank assets. Also, a new Tier I common risk-based ratio was defined. Under the Basel III requirements, at September 30, 2015, the Company met all capital adequacy requirements and had regulatory capital ratios in excess of the levels established for well-capitalized institutions. At September 30, 2015 and December 31, 2014, the Bank and the consolidated holding company exceeded all capital ratio requirements under prompt corrective action or other regulatory requirements, as is detailed in the table below: September 30, 2015 Required to be Required to be considered considered well adequately Actual capitalized (1) capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated % $ N/A N/A % $ NBH Bank, N.A. % % $ % Common equity tier 1 risk-based capital Consolidated % $ % $ % $ NBH Bank, N.A. % % % Tier 1 risk-based capital ratio (2) Consolidated % $ % $ % $ NBH Bank, N.A. % % % Total risk-based capital ratio (2) Consolidated % $ % $ % $ NBH Bank, N.A. % % % (1) These ratio requirements for NBH Bank, N.A. are reflective of the agreements NBH Bank, N.A. made with its regulator in connection with the approval of its de novo charter. On October 19, 2015, the operating agreement between the Bank and the OCC was terminated. (2) Due to the conditional guarantee represented by the loss sharing agreements, the FDIC indemnification asset and the portion of assets covered by the FDIC loss sharing agreements are risk-weighted at 20% for purposes of risk-based capital computations . December 31, 2014 Required to be Required to be considered considered well adequately Actual capitalized (1) capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated % $ N/A N/A % $ NBH Bank, N.A. % % $ % Tier 1 risk-based capital ratio (2) Consolidated % $ % $ % $ NBH Bank, N.A. % % % Total risk-based capital ratio (2) Consolidated % $ % $ % $ NBH Bank, N.A. % % % (1) These ratio requirements for NBH Bank, N.A. are reflective of the agreements NBH Bank, N.A. made with its regulator in connection with the approval of its de novo charter. On October 19, 2015, the operating agreement between the Bank and the OCC was terminated. (2) Due to the conditional guarantee represented by the loss sharing agreements, the FDIC indemnification asset and the portion of assets covered by the FDIC loss sharing agreements are risk-weighted at 20% for purposes of risk-based capital computations.

FDIC Loss Sharing Income (Expen

FDIC Loss Sharing Income (Expense)	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
FDIC Loss Sharing Income (Expense)	Note 11 FDIC Loss Sharing Income (Expense) In connection with the loss sharing agreements that the Company has with the FDIC with regard to the Hillcrest Bank and Community Banks of Colorado transactions, the Company recognizes the actual reimbursement of costs of resolution of covered assets from the FDIC through the consolidated statements of operations. The table below provides additional details of the Company’s FDIC loss sharing income (expense) during the three and nine months ended September 30, 2015 and 2014: For the three months ended For the nine months ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Clawback liability amortization $ $ $ $ Clawback liability remeasurement Reimbursement to FDIC for gain on sale of and income from covered OREO Reimbursement to FDIC for recoveries FDIC reimbursement of covered asset resolution costs Total $ $ $ $

Stock-based Compensation and Em

Stock-based Compensation and Employee Benefits	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation and Employee Benefits	Note 12 Stock-based Compensation and Benefits The Company provides stock-based compensation in accordance with shareholder-approved plans. During the second quarter of 2014, shareholders approved the 2014 Omnibus Incentive Plan (the "2014 Plan"). The 2014 Plan replaces the NBH Holdings Corp. 2009 Equity Incentive Plan (the "Prior Plan"), pursuant to which the Company granted equity awards prior to the approval of the 2014 Plan. Pursuant to the 2014 Plan, the Compensation Committee of the Board of Directors has the authority to grant, from time to time, awards of options, stock appreciation rights, restricted stock, restricted stock units, performance units, other stock-based awards, or any combination thereof to eligible persons. As of September 30, 2015, the aggregate number of Class A common stock available for issuance under the 2014 Plan is 5,189,159 shares. Any shares that are subject to stock options or stock appreciation rights under the 2014 Plan will be counted against the amount available for issuance as one share for every one share granted, and any shares that are subject to awards under the 2014 Plan other than stock options or stock appreciation rights will be counted against the amount available for issuance as 3.25 shares for every one share granted. The 2014 Plan provides for recycling of shares from both the Prior Plan and the 2014 Plan, the terms of which are further described in the Company's Proxy Statement for its 2014 Annual Meeting of Shareholders. To date, the Company has issued stock options and restricted stock under the plans. The Compensation Committee sets the option exercise price at the time of grant but in no case is the exercise price less than the fair market value of a share of stock at the date of grant. The following table summarizes stock option activity for the nine months ended September 30, 2015: Weighted Average Weighted Remaining Average Contractual Aggregate Exercise Term in Intrinsic Options Price Years Value Outstanding at December 31, 2014 $ $ Granted Forfeited Surrendered Exercised Expired Outstanding at September 30, 2015 $ $ Options fully vested and exercisable at September 30, 2015 $ $ — Options expected to vest $ $ Stock option expense is included in salaries and benefits in the consolidated statements of operations and totaled $0.2 million and $0.3 million for the three months ended September 30, 2015 and 2014, respectively, and $0.5 million and $1.0 million for the nine months ended September 30, 2015 and 2014, respectively. At September 30, 2015, there was $0.8 million of total unrecognized compensation cost related to non-vested stock options granted under the plans. The cost is expected to be recognized over a weighted average period of 2.1 years. Expense related to non-vested restricted stock totaled $0.8 million and $0.8 million during the three months ended September 30, 2015 and 2014, respectively, and $2.0 million and $1.8 million during the nine months ended September 30, 2015 and 2014, respectively, and is included in salaries and benefits in the consolidated statements of operations. As of September 30, 2015, there was $3.1 million of total unrecognized compensation cost related to non-vested restricted shares granted under the plans, which is expected to be recognized over a weighted average period of 2.3 years. The following table summarizes restricted stock activity for the nine months ended September 30, 2015: Total Weighted Restricted Average Grant- Shares Date Fair Value Unvested at December 31, 2014 $ Vested Granted Forfeited Surrendered Unvested at September 30, 2015 $

Warrants

Warrants	9 Months Ended
	Sep. 30, 2015
Warrants and Rights Note Disclosure [Abstract]
Warrants	Note 13 Warrants The Company had 725,750 and 830,750 outstanding warrants to purchase Company stock as of September 30, 2015 and December 31, 2014, respectively. The warrants were granted to certain lead shareholders of the Company, all with an exercise price of $20.00 per share. The term of the warrants is for ten years from the date of grant and the expiration dates of the warrants outstanding at September 30, 2015 range from October 20, 2019 to March 23, 2020 . The fair value of the warrants was estimated to be $2.6 million and $3.3 million at September 30, 2015, and December 31, 2014, respectively. During the quarter ended September 30, 2015, 105,000 warrants were repurchased as a result of agreements with the underlying counterparties. The fair value of the warrants was estimated using a Black-Scholes option pricing model utilizing the following assumptions at the indicated dates: September 30, 2015 December 31, 2014 Risk-free interest rate % % Expected volatility % % Expected term (years) 4 - 5 5 - 6 Dividend yield % % The Company’s shares became publicly traded on September 20, 2012, and prior to that had limited private trading. Due to the limited historical volatility of the Company's own stock, expected volatility was calculated using a time-based weighted migration of the Company’s own stock price volatility coupled with the median historical volatility, for a period commensurate with the expected term of the warrants, of those of a peer group. The risk-free rate for the expected term of the warrants was based on the U.S. Treasury yield curve and based on the expected term. The expected term was estimated based on the contractual term of the warrants. The Company recorded a benefit of $0.5 million and $0.4 million for the three and nine months ended September 30, 2015, respectively, and a benefit of $1.3 million and $2.7 million for the three and nine months ended September 30, 2014, respectively, in the consolidated statements of operations resulting from the change in fair value of the warrant liability and the repurchase of the previously mentioned 105,000 warrants.

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Common Stock	Note 14 Common Stock On February 11, 2015, the Board of Directors authorized a new share repurchase program for up to $50.0 million from time to time in either the open market or through privately negotiated transactions. This new program replaced the previous $50.0 million share repurchase program approved during the fourth quarter of 2014. On August 10, 2015, the Company completed a tender offer and repurchased a total of 4,651,163 shares for a total price of $100.0 million at a weighted average price of $21.50 per share. In total, during the three and nine months ended September 30, 2015, the Company repurchased 4,751,163 and 8,645,836 shares for $102.0 million and $174.3 million, at a weighted average price of $21.47 and $20.16 per share, respectively. The Company had 30,318,684 shares of Class A common stock and zero shares of Class B common stock outstanding as of September 30, 2015, and 38,017,179 shares of Class A common stock and 867,774 shares of Class B common stock outstanding as of December 31, 2014. Additionally, as of September 30, 2015 and December 31, 2014, the Company had 1,046,980 and 955,398 shares, respectively, of restricted Class A common stock issued but not yet vested under the 2014 Plan and the Prior Plan that are not included in shares outstanding until such time that they are vested; however, these shares do have voting and certain dividend rights during the vesting period.

Income (Loss) Per Share

Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Income (Loss) Per Share	Note 15 Income Per Share The Company calculates income per share under the two-class method, as certain non-vested share awards contain non-forfeitable rights to dividends. As such, these awards are considered securities that participate in the earnings of the Company. The Company had 30,318,684 and 39,862,824 shares outstanding (inclusive of Class A and B) as of September 30, 2015 and 2014, respectively, exclusive of issued non-vested restricted shares. Certain stock options and non-vested restricted shares are potentially dilutive securities, but are not included in the calculation of diluted earnings per share because to do so would have been anti-dilutive for three and nine months ended September 30, 2015. The following table illustrates the computation of basic and diluted income per share for the three and nine months ended September 30, 2015 and 2014: For the three months ended For the nine months ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net income $ $ $ $ Less: earnings allocated to participating securities Earnings allocated to common shareholders $ $ $ $ Weighted average shares outstanding for basic earnings per common share Dilutive effect of equity awards Dilutive effect of warrants — — — Weighted average shares outstanding for diluted earnings per common share Basic earnings per share $ $ $ $ Diluted earnings per share $ $ $ $ The Company had 3,060,664 and 3,613,191 outstanding stock options to purchase common stock at weighted average exercise prices of $19.86 and $19.89 per share at September 30, 2015 and 2014, respectively, which have time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those stock options is dilutive. Additionally, the Company had 725,750 and 830,750 outstanding warrants to purchase the Company’s common stock as of September 30, 2015 and 2014, respectively. The warrants have an exercise price of $20.00 , which was in-the-money for the three months ended September 30, 2015, and out-of-the-money during the three months ended September 30, 2014, and nine months ended September 30, 2015 and 2014, for purposes of dilution calculations. The Company had 1,046,980 and 1,149,505 unvested restricted shares issued as of September 30, 2015 and 2014, respectively, which have performance, market and/or time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those restricted shares is dilutive.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Note 16 Derivatives Risk management objective of using derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company has established policies that neither carrying value nor fair value at risk should exceed established guidelines. The Company has designed strategies to confine these risks within the established limits and identify appropriate trade-offs in the financial structure of its balance sheet. These strategies include the use of derivative financial instruments to help achieve the desired balance sheet repricing structure while meeting the desired objectives of its clients. Currently the Company employs certain interest rate swaps that are designated as fair value hedges as well as economic hedges. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. Fair values of derivative instrument of the balance sheet The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the consolidated statements of financial condition as of September 30, 2015 and December 31, 2014. Information about the valuation methods used to measure fair value is provided in note 18 of the unaudited consolidated financial statements. Asset Derivatives Fair Value Liability Derivatives Fair Value Balance Sheet Balance Sheet Location September 30, 2015 December 31, 2014 Location September 30, 2015 December 31, 2014 Derivatives designated as hedging instruments Interest rate products Other assets $ $ Other liabilities $ $ Total derivatives designated as hedging instruments $ $ $ $ Derivatives not designated as hedging instruments Interest rate products Other assets $ $ Other liabilities $ $ Total derivatives not designated as hedging instruments $ $ $ $ Fair value hedges of interest rate risk Interest rate swaps designated as fair value hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. As of September 30, 2015, the Company had 27 interest rate swaps with a notional amount of $246.9 million that were designated as fair value hedges of interest rate risk associated with the Company’s fixed-rate loans. The Company had 11 outstanding interest rate swaps with a notional amount of $68.8 million that were designated as a fair value hedge as of December 31, 2014. For qualifying derivatives designated as fair value hedges, the gain or loss on the derivative, as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. The Company includes the gain or loss on the hedged items in the same line item as the offsetting loss or gain on the related derivatives. During the three and nine months ended September 30, 2015, the Company recognized a net loss of $522 thousand and $255 thousand, respectively, in non-interest income related to hedge ineffectiveness. During the three and nine months ended September 30, 2014, the Company recognized a net loss of $46 thousand and $186 thousand, respectively, in non-interest income related to hedge ineffectiveness. Non-designated hedges Derivatives not designated as hedges are not speculative and consist of interest rate swaps with commercial banking clients that facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the client swaps and the offsetting swaps are recognized directly in earnings. As of September 30, 2015, the Company had 19 matched interest rate swap transactions with an aggregate notional amount of $67.6 million related to this program. As of December 31, 2014, the Company had 11 matched interest rate swap transactions with an aggregate notional amount of $35.9 million related to this program. Effect of Derivative Instruments on the Consolidated Statements of Operations The tables below present the effect of the Company’s derivative financial instruments on the unaudited consolidated statements of operations for the three and nine months ended September 30, 2015 and 2014: Location of (loss) Amount of (loss) recognized in income on derivatives Derivatives in fair value recognized in income on Three months ended September 30, For the nine months ended September 30, hedging relationships derivatives 2015 2014 2015 2014 Interest rate products Other non-interest income $ $ $ $ Total $ $ $ $ Location of gain or (loss) Amount of gain or (loss) recognized in income on derivatives recognized in income on Three months ended September 30, For the nine months ended September 30, Hedged items hedged items 2015 2014 2015 2014 Interest rate products Other non-interest income $ $ $ $ Total $ $ $ $ Derivatives not Location of (loss) Amount of (loss) recognized in income on derivatives designated as recognized in income on Three months ended September 30, For the nine months ended September 30, hedging instruments derivatives 2015 2014 2015 2014 Interest rate products Other non-interest expense $ $ $ $ Total $ $ $ $ Credit-risk-related Contingent Features The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness for reasons other than an error or omission of an administrative or operational nature, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty has the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of September 30, 2015 and December 31, 2014, the termination value of derivatives in a net liability position related to these agreements was $13.5 million and $1.9 million, respectively, which includes accrued interest but excludes any adjustment for nonperformance risk. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and as of September 30, 2015 and December 31, 2014, the Company had posted $14.4 million and $5.5 million, respectively, in eligible collateral.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 17 Commitments and Contingencies In the normal course of business, the Company enters into various off-balance sheet commitments to help meet the financing needs of clients. These financial instruments include commitments to extend credit, commercial and consumer lines of credit and standby letters of credit. The same credit policies are applied to these commitments as the loans on the consolidated statements of financial condition; however, these commitments involve varying degrees of credit risk in excess of the amount recognized in the consolidated statements of financial condition. At September 30, 2015 and December 31, 2014, the Company had loan commitments totaling $499.7 million and $485.5 million, respectively, and standby letters of credit that totaled $8.5 million and $10.0 million, respectively. The total amounts of unused commitments do not necessarily represent future credit exposure or cash requirements, as commitments often expire without being drawn upon. However, the contractual amount of these commitments, offset by any additional collateral pledged, represents the Company’s potential credit loss exposure. Amounts funded under non-cancelable commitments in effect at the date of acquisition are covered under the applicable loss sharing agreements if certain conditions are met. Total unfunded commitments at September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 December 31, 2014 Covered Non-covered Total Covered Non-covered Total Commitments to fund loans: Residential $ — $ $ $ — $ $ Commercial and commercial real estate — Construction and land development — — Consumer — — Credit card lines of credit — — Unfunded commitments under lines of credit Commercial and standby letters of credit Total $ $ $ $ $ $ Commitments to fund loans —Commitments to fund loans are legally binding agreements to lend to clients in accordance with predetermined contractual provisions providing there have been no violations of any conditions specified in the contract. These commitments are generally at variable interest rates and are for specific periods or contain termination clauses and may require the payment of a fee. The total amounts of unused commitments are not necessarily representative of future credit exposure or cash requirements, as commitments often expire without being drawn upon. Credit card lines of credit —The Company extends lines of credit to clients through the use of credit cards issued by the Bank. These lines of credit represent the maximum amounts allowed to be funded, many of which will not exhaust the established limits, and as such, these amounts are not necessarily representations of future cash requirements or credit exposure. Unfunded commitments under lines of credit —In the ordinary course of business, the Company extends revolving credit to its clients. These arrangements may require the payment of a fee. Commercial and standby letters of credit —As a provider of financial services, the Company routinely issues commercial and standby letters of credit, which may be financial standby letters of credit or performance standby letters of credit. These are various forms of “back-up” commitments to guarantee the performance of a client to a third party. While these arrangements represent a potential cash outlay for the Company, the majority of these letters of credit will expire without being drawn upon. Letters of credit are subject to the same underwriting and credit approval process as traditional loans, and as such, many of them have various forms of collateral securing the commitment, which may include real estate, personal property, receivables or marketable securities. Contingencies In the ordinary course of business, the Company and the Bank may be subject to litigation. Based upon the available information and advice from the Company’s legal counsel, management does not believe that any potential, threatened or pending litigation to which it is a party will have a material adverse effect on the Company’s liquidity, financial condition or results of operations.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 18 Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For disclosure purposes, the Company groups its financial and non-financial assets and liabilities into three different levels based on the nature of the instrument and the availability and reliability of the information that is used to determine fair value. The three levels are defined as follows: · Level 1—Includes assets or liabilities in which the inputs to the valuation methodologies are based on unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2—Includes assets or liabilities in which the inputs to the valuation methodologies are based on similar assets or liabilities in inactive markets, quoted prices for identical or similar assets or liabilities in inactive markets, and inputs other than quoted prices that are observable, such as interest rates, yield curves, volatilities, prepayment speeds, and other inputs obtained from observable market input. · Level 3—Includes assets or liabilities in which the inputs to the valuation methodology are based on at least one significant assumption that is not observable in the marketplace. These valuations may rely on management’s judgment and may include internally-developed model-based valuation techniques. Level 1 inputs are considered to be the most transparent and reliable and level 3 inputs are considered to be the least transparent and reliable. The Company assumes the use of the principal market to conduct a transaction of each particular asset or liability being measured and then considers the assumptions that market participants would use when pricing the asset or liability. Whenever possible, the Company first looks for quoted prices for identical assets or liabilities in active markets (level 1 inputs) to value each asset or liability. However, when inputs from identical assets or liabilities on active markets are not available, the Company utilizes market observable data for similar assets and liabilities. The Company maximizes the use of observable inputs and limits the use of unobservable inputs to occasions when observable inputs are not available. The need to use unobservable inputs generally results from the lack of market liquidity of the actual financial instrument or of the underlying collateral. Although, in some instances, third party price indications may be available, limited trading activity can challenge the observability of these quotations. Changes in the valuation inputs used for measuring the fair value of financial instruments may occur due to changes in current market conditions or other factors. Such changes may necessitate a transfer of the financial instruments to another level in the hierarchy based on the new inputs used. The Company recognizes these transfers at the end of the reporting period that the transfer occurs. During the nine months ended September 30, 2015 and 2014, there were no transfers of financial instruments between the hierarchy levels. The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of each instrument under the valuation hierarchy: Fair Value of Financial Instruments Measured on a Recurring Basis Investment securities available-for-sale —Investment securities available-for-sale are carried at fair value on a recurring basis. To the extent possible, observable quoted prices in an active market are used to determine fair value and, as such, these securities are classified as level 1. At September 30, 2015 and December 31, 2014, the Company did not hold any level 1 securities. When quoted market prices in active markets for identical assets or liabilities are not available, quoted prices of securities with similar characteristics, discounted cash flows or other pricing characteristics are used to estimate fair values and the securities are then classified as level 2. At September 30, 2015 and December 31, 2014, the Company’s level 2 securities included mortgage-backed securities comprised of residential mortgage pass-through securities, and other residential mortgage-backed securities. All other investment securities are classified as level 3. Derivatives —The Company's derivative instruments are limited to interest rate swaps that may be accounted for as fair value hedges or non-designated hedges. The fair values of the swaps incorporate credit valuation adjustments in order to appropriately reflect nonperformance risk in the fair value measurements. The credit valuation adjustment is the dollar amount of the fair value adjustment related to credit risk and utilizes a probability weighted calculation to quantify the potential loss over the life of the trade. The credit valuation adjustments are calculated by determining the total expected exposure of the derivatives (which incorporates both the current and potential future exposure) and then applying the respective counterparties’ credit spreads to the exposure offset by marketable collateral posted, if any. Certain derivative transactions are executed with counterparties who are large financial institutions ("dealers"). International Swaps and Derivative Association Master Agreements ("ISDA") and Credit Support Annexes ("CSA") are employed for all contracts with dealers. These contracts contain bilateral collateral arrangements. The fair value inputs of these financial instruments are determined using discounted cash flow analysis through the use of third-party models whose significant inputs are readily observable market parameters, primarily yield curves, with appropriate adjustments for liquidity and credit risk, and are classified as level 2. Warrant liability —The Company measures the fair value of the warrant liability on a recurring basis using a Black-Scholes option pricing model. The Company’s shares became publicly traded on September 20, 2012 and prior to that, had limited private trading; therefore, expected volatility was estimated using a time-based weighted migration of the Company’s own stock price volatility coupled with the median historical volatility, for a period commensurate with the expected term of the warrants, of those eight comparable companies with publicly traded shares, and is deemed a significant unobservable input to the valuation model, as such these instruments are classified as level 3. Clawback liability —The Company periodically measures the net present value of expected future cash payments to the FDIC that must be made within 45 days of the conclusion of the loss share agreements. The expected cash flows are calculated in accordance with the loss sharing agreements and are based primarily on the expected losses on the covered assets, which involve significant inputs that are not market observable, as such these instruments are classified as level 3. The tables below present the financial instruments measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 on the consolidated statements of financial condition utilizing the hierarchy structure described above: September 30, 2015 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ $ — $ Other residential MBS issued or guaranteed by U.S.Government agencies or sponsored enterprises — — Other securities — — Derivatives — — Total assets at fair value $ — $ $ $ Liabilities: Warrant liability $ — $ — $ $ Clawback liability — — Derivatives — — Total liabilities at fair value $ — $ $ $ December 31, 2014 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ $ — $ Other residential MBS issued or guaranteed by U.S.Government agencies or sponsored enterprises — — Other securities — — Derivatives — — Total assets at fair value $ — $ $ $ Liabilities: Warrant liability $ — $ — $ $ Clawback liability — — Derivatives — — Total liabilities at fair value $ — $ $ $ The table below details the changes in level 3 financial instruments during the nine months ended September 30, 2015 and September 30, 2014: Other Warrant Clawback Securities liability liability Balance at December 31, 2013 $ $ $ Change in value — Amortization — — Net change in Level 3 — Balance at September 30, 2014 $ $ $ Balance at December 31, 2014 $ $ $ Change in value Purchases through acquisition — — Amortization — — Net change in Level 3 Balance at September 30, 2015 $ $ $ Fair Value Measured on a Non-recurring Basis Certain assets may be recorded at fair value on a non-recurring basis as conditions warrant. These non-recurring fair value measurements typically result from the application of lower of cost or fair value accounting or a write-down occurring during the period. The Company records collateral dependent loans that are considered to be impaired at their estimated fair value. A loan is considered impaired when it is probable that the Company will be unable to collect all contractual amounts due in accordance with the terms of the loan agreement. Collateral dependent impaired loans are measured based on the fair value of the collateral. The Company relies on third-party appraisals and internal assessments in determining the estimated fair values of these loans. The inputs used to determine the fair values of loans are considered level 3 inputs in the fair value hierarchy. During the nine months ended September 30, 2015, the Company measured fourteen loans not accounted for under ASC 310-30 at fair value on a non-recurring basis. These loans carried specific reserves totaling $3.2 million at September 30, 2015. During the nine months ended September 30, 2015, the Company added specific reserves of $3.0 million for eleven loans with carrying balances of $14.5 million at September 30, 2015. The Company also decreased specific reserves of $0.1 million for four loans during the nine months ended September 30, 2015. The Company may be required to record fair value adjustments on loans held-for-sale on a non-recurring basis. The non-recurring fair value adjustments could involve lower of cost or fair value accounting and may include write-downs. OREO is recorded at fair value of the collateral less estimated selling costs. The estimated fair values of OREO are updated periodically and further valuation adjustments may be taken to reflect a new basis. The Company recognized $0.8 million of OREO impairments in its unaudited consolidated statements of operations during the nine months ended September 30, 2015, of which $0.5 million, or 65.7% , were on OREO that was covered by loss sharing agreements with the FDIC. During the nine months ended September 30, 2014, the Company recognized $1.8 million of OREO impairments in its unaudited consolidated statements of operations, of which $1.1 million, or 60.2% , were on OREO that was covered by loss sharing agreements with the FDIC. The fair values of OREO are derived from third party price opinions or appraisals that generally use an income approach or a market value approach. If reasonable comparable appraisals are not available, then the Company may use internally developed models to determine fair values. The inputs used to determine the fair values of OREO are considered level 3 inputs in the fair value hierarchy. Premises and equipment held-for-sale are written down to estimated fair value less costs to sell in the period in which the held-for-sale criteria are met. Fair value is estimated in a process which considers current local commercial real estate market conditions and the judgment of the sales agent and often involves obtaining third party appraisals from certified real estate appraisers. These fair value measurements are classified as level 3. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. The Company recognized $1.1 million of impairments in its unaudited consolidated statements of operations related to banking centers classified as held-for-sale during the nine months ended September 30, 2015. The table below provides information regarding the assets recorded at fair value on a non-recurring basis during the nine months ended September 30, 2015 and 2014: September 30, 2015 Total Losses from fair value changes Other real estate owned $ $ Impaired loans Premises and equipment September 30, 2014 Total Losses from fair value changes Other real estate owned $ $ Impaired loans The Company did not record any liabilities for which the fair value was made on a non-recurring basis during the nine months ended September 30, 2015. The following table provides information about the valuation techniques and unobservable inputs used in the valuation of financial instruments falling within level 3 of the fair value hierarchy as of September 30, 2015. The table below excludes non-recurring fair value measurements of collateral value used for impairment measures for OREO and premise and equipment held-for-sale. These valuations utilize third party appraisal or broker price opinions, and are classified as level 3 due to the significant judgment involved: Fair value at Quantitative September 30, 2015 Valuation Technique Unobservable Input Measures Other securities $ Cash investment in private equity fund, Par value Cash and CD investment par value Impaired loans Appraised value Appraised values Discount rate 0% - 25% Clawback liability Contractually defined discounted cash flows Intrinsic loss estimates $323.3 million - $405.0 million Expected credit losses — Discount rate 4% Warrant liability Black-Scholes Volatility 21% - 28%

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 19 Fair Value of Financial Instruments The fair value of a financial instrument is the amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is determined based upon quoted market prices to the extent possible; however, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques that may be significantly impacted by the assumptions used, including the discount rate and estimates of future cash flows. Changes in any of these assumptions could significantly affect the fair value estimates. The fair value of the financial instruments listed below does not reflect a premium or discount that could result from offering all of the Company’s holdings of financial instruments at one time, nor does it reflect the underlying value of the Company, as ASC Topic 825 excludes certain financial instruments and all non-financial instruments from its disclosure requirements. In connection with the Hillcrest Bank, Bank Midwest, Bank of Choice, Community Banks of Colorado and Pine River acquisitions, the Company recorded all of the acquired assets and assumed liabilities at fair value at the respective dates of acquisition. The fair value of financial instruments at September 30, 2015 and December 31, 2014, including methods and assumptions utilized for determining fair value of financial instruments, are set forth below: Level in fair value September 30, 2015 December 31, 2014 measurement Carrying Estimated Carrying Estimated hierarchy amount fair value amount fair value ASSETS Cash and cash equivalents Level 1 $ $ $ $ Securities purchased under agreements to resell Level 2 — — Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 Other available-for-sale securities Level 3 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 Capital stock of FHLB Level 2 Capital stock of FRB Level 2 Loans receivable, net Level 3 Loans held-for-sale Level 2 Accrued interest receivable Level 2 Derivatives Level 2 LIABILITIES Deposit transaction accounts Level 2 Time deposits Level 2 Securities sold under agreements to repurchase Level 2 Federal Home Loan Bank advances Level 2 Due to FDIC Level 3 Warrant liability Level 3 Accrued interest payable Level 2 Derivatives Level 2 Cash and cash equivalents Cash and cash equivalents have a short-term nature and the estimated fair value is equal to the carrying value. S ecurities purchased under agreements to resell The fair value of securities purchased under agreements to resell is estimated by discounting contractual maturities utilizing current market rates for similar instruments. Investment securities The estimated fair value of investment securities is based on quoted market prices or bid quotations received from securities dealers. Other investment securities, including securities that are held for regulatory purposes are carried at cost, less any other- than-temporary impairment. Loans receivable The estimated fair value of the loan portfolio is estimated using a discounted cash flow analysis using a discount rate based on interest rates offered at the respective measurement dates for loans with similar terms to borrowers of similar credit quality. The allowance for loan losses is considered a reasonable estimate of any required adjustment to fair value to reflect the impact of credit risk. The estimates of fair value do not incorporate the exit-price concept prescribed by ASC Topic 820, Fair Value Measurements and Disclosures . Loans held-for-sale Loans held-for-sale are carried at the lower of aggregate cost or estimated fair value. The portfolio consists primarily of fixed rate residential mortgage loans that are sold within 45 days. The estimated fair value is based on quoted market prices for similar loans in the secondary market and is classified as level 2. Accrued interest receivable Accrued interest receivable has a short-term nature and the estimated fair value is equal to the carrying value. Deposits The estimated fair value of deposits with no stated maturity, such as non-interest bearing demand deposits, savings, NOW accounts, and money market accounts, is equal to the amount payable on demand. The fair value of interest-bearing time deposits is based on the discounted value of contractual cash flows of such deposits, taking into account the option for early withdrawal. The discount rate is estimated using the current market rates offered by the Company, at the respective measurement dates, for deposits of similar remaining maturities. Derivative assets and liabilities Fair values for derivative assets and liabilities are fully described in note 16 of the unaudited consolidated financial statements. Securities sold under agreements to repurchase The vast majority of the Company’s repurchase agreements are overnight transactions that mature the day after the transaction, and as a result of this short-term nature, the estimated fair value is equal to the carrying value. Due to FDIC The amount due to FDIC is specified in the purchase agreements and, as it relates to the clawback liability, is discounted to reflect the uncertainty in the timing and payment of the amount due by the Company. Warrant liability The warrant liability is estimated using a Black-Scholes model, the assumptions of which are detailed in note 13 of the unaudited consolidated financial statements. Accrued interest payable Accrued interest payable has a short-term nature and the estimated fair value is equal to the carrying value.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 20 Subsequent Events On October 19, 2015, the Company announced that the operating agreement between its subsidiary, NBH Bank, N.A., and its primary regulator, the Office of the Comptroller of the Currency, was terminated. The operating agreement was entered into in December 2010 as part of the Bank’s approval to operate as a de novo bank. The agreement required the Bank to maintain certain capital levels, placed restrictions on its ability to pay dividends and limited its ability to make certain other business decisions. On November 5, 2015, the Bank entered into an early termination agreement with the FDIC that terminated the Bank’s loss share agreements with the FDIC. The Bank paid consideration of $15.1 million to the FDIC for the termination of the agreements. The Bank expects to record a one-time after-tax gain of approximately $2.6 million, or $0.09 per share, in the fourth quarter of 2015. The gain results primarily from the settlement payment made to the FDIC, and the elimination of the remaining FDIC indemnification asset and the clawback payable, which totaled $18.2 million and $38.7 million, respectively, at September 30, 2015.

Recent Accounting Pronounceme30

Recent Accounting Pronouncements - (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure - In January 2014, the FASB issued Accounting Standards Update ("ASU") 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure . This update amends ASC Topic 310-40 and clarifies that an “in substance repossession or foreclosure” has occurred upon the creditor obtaining either legal title to the property upon completion of foreclosure, or the borrower conveying all interest in the property through completion of a deed in lieu of foreclosure. Upon occurrence, the creditor derecognizes the loan receivable and recognizes the collateralized real estate property. The amendments in the ASU became effective for the Company for interim and annual periods beginning after December 15, 2014. Early adoption was permitted. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity. Revenue from Contracts with Customers - In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." This update supersedes revenue recognition requirements in Topic 605, Revenue Recognition , including most industry-specific revenue recognition guidance in the FASB Accounting Standards Codification. The new guidance stipulates that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides specific steps that entities should apply in order to achieve this principle. In July 2015, the FASB voted to approve deferring the effective date by one year (i.e., interim and annual reporting periods beginning after December 15, 2017). Early adoption is permitted, but not before the original effective date (i.e., interim and annual reporting periods beginning after December 15, 2016). The Company is in the process of evaluating the impact of the ASU's adoption on the Company's consolidated financial statements. Simplifying the Accounting for Measurement-Period Adjustments - In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments . This update amends ASC Topic 805-10 and clarifies that an acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this ASU will become effective for the Company for interim and annual periods beginning after December 15, 2015. Early adoption is permitted. The Company adopted this ASU on September 30, 2015 with no material impact to the consolidated financial statements.

Acquisition Activities - (Table

Acquisition Activities - (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Net Assets acquired (at fair value) and consideration transferred	Assets: Cash and due from banks $ Investment securities available-for-sale (at fair value) Non-marketable securities Loans, net Other real estate owned Premises and equipment, net Core deposit intangible asset Other assets Total assets acquired $ Liabilities: Deposits: Non-interest bearing demand deposits $ Interest bearing demand deposits Savings and money market Time deposits Total deposits Other liabilities Total liabilities assumed $ Identifiable net assets acquired $ Consideration: Cash $ Gain on bargain purchase $

Investment Securities - (Tables

Investment Securities - (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	Available-for-sale investment securities are summarized as follows as of the dates indicated: September 30, 2015 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ — $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Other securities — — Total $ $ $ $ December 31, 2014 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Other securities — — Total $ $ $ $
Summary of Unrealized Losses	The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: September 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ — $ — $ — $ — Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ — $ — $ $ $ $ December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ — $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total $ $ $ $ $
Held-to-maturity Securities	Held-to-maturity investment securities are summarized as follows as of the dates indicated: September 30, 2015 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total investment securities held-to-maturity $ $ $ $ December 31, 2014 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises Total investment securities held-to-maturity $ $ $ $
Held-to-maturity securities continuous unrealized loss position fair value [Table Text Block]	The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: September 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ $ $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ $ $ $ $ $ December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ $ $ $ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — Total $ — $ — $ $ $ $

Loans - (Tables)

Loans - (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30 and Loans Covered by the FDIC Loss Sharing Agreements	The carrying value of loans are net of discounts, fees and costs on loans excluded from ASC 310-30 of $8.6 million and $10.5 million as of September 30, 2015 and December 31, 2014, respectively: September 30, 2015 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ $ $ % Agriculture Commercial real estate Residential real estate Consumer Total $ $ $ % Covered $ $ $ % Non-covered Total $ $ $ % December 31, 2014 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ $ $ % Agriculture Commercial real estate Residential real estate Consumer Total $ $ $ % Covered $ $ $ % Non-covered Total $ $ $ %
Past Due Financing Receivables	Loan delinquency for all loans is shown in the following tables at September 30, 2015 and December 31, 2014, respectively: Total Loans September 30, 2015 Loans > 90 60-89 Greater days past 30-59 days than 90 due and days past past days past Total past Total still Non- due due due due Current loans accruing accrual Loans excluded from ASC 310-30 Commercial $ $ $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied — — — Non owner-occupied — — Total commercial real estate — — Residential real estate Senior lien Junior lien Total residential real estate Consumer — — Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Covered loans excluded from ASC 310-30 $ — $ — $ $ $ $ $ — $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ — $ $ $ $ $ $ — Agriculture — Commercial real estate — — Residential real estate — — Consumer — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Covered loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Non-covered loans accounted for under ASC 310-30 — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Total loans $ $ $ $ $ $ $ $ Covered loans $ $ $ $ $ $ $ $ Non-covered loans Total loans $ $ $ $ $ $ $ $ Total Loans December 31, 2014 Loans > 90 60-89 Greater days past 30-59 days than 90 due and days past past days past Total past Total still Non- due due due due Current loans accruing accrual Loans excluded from ASC 310-30 Commercial $ $ $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — — — — Acquisition/development — — — — Multifamily — — — — — Owner-occupied — Non owner-occupied — — Total commercial real estate Residential real estate Senior lien — Junior lien — Total residential real estate — Consumer Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ — $ $ $ $ $ $ — Agriculture — — — Commercial real estate — Residential real estate — Consumer — — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Covered loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Non-covered loans accounted for under ASC 310-30 — Total loans accounted for under ASC 310-30 $ $ $ $ $ $ $ $ — Total loans $ $ $ $ $ $ $ $ Covered loans $ $ $ $ $ $ $ $ Non-covered loans Total loans $ $ $ $ $ $ $ $
Credit Exposure for Loans as Determined by Company's Internal Risk Rating System	Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows as of September 30, 2015 and December 31, 2014, respectively: Total Loans September 30, 2015 Special Pass mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Construction — Acquisition/development — — — Multifamily — — — Owner-occupied — Non owner-occupied Total commercial real estate Residential real estate Senior lien Junior lien — Total residential real estate Consumer — Total loans excluded from ASC 310-30 $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ $ $ — $ Agriculture — Commercial real estate Residential real estate — Consumer — Total loans accounted for under ASC 310-30 $ $ $ $ $ Covered loans accounted for under ASC 310-30 $ $ $ $ $ Non-covered loans accounted for under ASC 310-30 — Total loans accounted for under ASC 310-30 $ $ $ $ $ Total loans $ $ $ $ $ Total covered $ $ $ $ $ Total non-covered Total loans $ $ $ $ $ Total Loans December 31, 2014 Special Pass mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Construction — — — Acquisition/development — — — Multifamily — — — Owner-occupied — Non owner-occupied Total commercial real estate Residential real estate Senior lien Junior lien — — Total residential real estate Consumer — — Total loans excluded from ASC 310-30 $ $ $ $ $ Covered loans excluded from ASC 310-30 $ $ $ $ $ Non-covered loans excluded from ASC 310-30 Total loans excluded from ASC 310-30 $ $ $ $ $ Loans accounted for under ASC 310-30 Commercial $ $ $ $ $ Agriculture — Commercial real estate Residential real estate — Consumer — Total loans accounted for under ASC 310-30 $ $ $ $ $ Covered loans accounted for under ASC 310-30 $ $ $ $ $ Non-covered loans accounted for under ASC 310-30 Total loans accounted for under ASC 310-30 $ $ $ $ $ Total loans $ $ $ $ $ Total covered $ $ $ $ $ Total non-covered Total loans $ $ $ $ $
Schedule Of Impaired Financing Receivable With And Without Related Allowance	Additional information regarding impaired loans at September 30, 2015 and December 31, 2014 is set forth in the table below: Impaired Loans September 30, 2015 December 31, 2014 Allowance Allowance Unpaid for loan Unpaid for loan principal Recorded losses principal Recorded losses balance investment allocated balance investment allocated With no related allowance recorded: Commercial $ $ $ — $ $ $ — Agriculture — — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied — — Non-owner occupied — — — — Total commercial real estate — — Residential real estate Senior lien — — Junior lien — — — — — — Total residential real estate — — Consumer — — — — — — Total impaired loans with no related allowance recorded $ $ $ — $ $ $ — With a related allowance recorded: Commercial $ $ $ $ $ $ Agriculture — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — Owner-occupied Non-owner occupied Total commercial real estate Residential real estate Senior lien Junior lien Total residential real estate Consumer Total impaired loans with a related allowance recorded $ $ $ $ $ $ Total impaired loans $ $ $ $ $ $
Schedule of Impaired Financing Receivable, Average Recorded Investment and Interest Income Recognized	The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For nine months ended September 30, 2015 September 30, 2014 Average recorded investment Interest income recognized Average recorded investment Interest income recognized With no related allowance recorded: Commercial $ $ $ $ Agriculture — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — — — — Owner-occupied Non-owner occupied — — — Total commercial real estate Residential real estate Senior lien Junior lien — — — — Total residential real estate Consumer — — — — Total impaired loans with no related allowance recorded $ $ $ $ With a related allowance recorded: Commercial $ $ $ $ Agriculture — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — Owner-occupied Non-owner occupied Total commercial real estate Residential real estate Senior lien Junior lien Total residential real estate Consumer Total impaired loans with a related allowance recorded $ $ $ $ Total impaired loans $ $ $ $
Additional Information Related to Accruing TDR's	The table below provides additional information related to accruing TDRs at September 30, 2015 and December 31, 2014: Accruing TDRs September 30, 2015 Average year-to- Unfunded date Unpaid commitments Recorded recorded principal to fund investment investment balance TDRs Commercial $ $ $ $ Agriculture — Commercial real estate — Residential real estate — Consumer — Total $ $ $ $ Accruing TDRs December 31, 2014 Average year-to- Unfunded date Unpaid commitments Recorded recorded principal to fund investment investment balance TDRs Commercial $ $ $ $ Agriculture — Commercial real estate — Residential real estate Consumer — Total $ $ $ $
Summary of Company's Carrying Value of Non-Accrual TDR's	The following table summarizes the Company’s carrying value of non-accrual TDRs as of September 30, 2015 and December 31, 2014: Non - Accruing TDRs September 30, 2015 December 31, 2014 Covered Non-covered Covered Non-covered Commercial $ $ $ $ Agriculture Commercial real estate — — Residential real estate Consumer — — Total $ $ $ $
Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield	The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the nine months ended September 30, 2015 and 2014: September 30, 2015 September 30, 2014 Accretable yield beginning balance $ $ Reclassification from non-accretable difference Reclassification to non-accretable difference Accretion Accretable yield ending balance $ $
Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30	Below is the composition of the net book value for loans accounted for under ASC 310-30 at September 30, 2015 and December 31, 2014: September 30, 2015 December 31, 2014 Contractual cash flows $ $ Non-accretable difference Accretable yield Loans accounted for under ASC 310-30 $ $

Allowance for Loan Losses - (Ta

Allowance for Loan Losses - (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Summary of Company's Allowance for Loan Losses ("ALL") and Recorded Investment in Loans	The tables below detail the Company’s allowance for loan losses (“ALL”) and recorded investment in loans as of and for the three and nine months ended September 30, 2015 and 2014: Three months ended September 30, 2015 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries — Provision Non 310-30 ending balance ASC 310-30 beginning balance Charge-offs — — — — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Three months ended September 30, 2014 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries Provision Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — — — — Recoveries — — — — — — Provision (recoupment) — — — ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Nine months ended September 30, 2015 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs Recoveries Provision (recoupment) Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ $ $ $ $ $ Non 310-30 loans collectively evaluated for impairment ASC 310-30 loans — Total ending allowance balance $ $ $ $ $ $ Loans: Non 310-30 individually evaluated for impairment $ $ $ $ $ $ Non 310-30 collectively evaluated for impairment ASC 310-30 loans Total loans $ $ $ $ $ $ Nine months ended September 30, 2014 Commercial Residential Commercial Agriculture real estate real estate Consumer Total Beginning balance $ $ $ $ $ $ Non 310-30 beginning balance Charge-offs — — Recoveries Provision (recoupment) Non 310-30 ending balance ASC 310-30 beginning balance — Charge-offs — — — Recoveries — — — — — — Provision (recoupment) ASC 310-30 ending balance — Ending balance $ $ $ $ $ $ Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ $ — $ $ $ $ Non 310-30 loans collectively evaluated for impairment ASC 310-30 loans — Total ending allowance balance $ $ $ $ $ $ Loans: Non 310-30 individually evaluated for impairment $ $ $ $ $ $ Non 310-30 collectively evaluated for impairment ASC 310-30 loans Total loans $ $ $ $ $ $

FDIC Indemnification Asset - (T

FDIC Indemnification Asset - (Tables)	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Summary of Activity Related to FDIC Indemnification Asset	Below is a summary of the activity related to the FDIC indemnification asset during the nine months ended September 30, 2015 and 2014: For the nine months ended September 30, 2015 September 30, 2014 Balance at beginning of period $ $ Amortization FDIC portion of charge-offs exceeding fair value marks Changes for FDIC loss share submissions Balance at end of period $ $

Other Real Estate Owned - (Tabl

Other Real Estate Owned - (Tables)	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Summary of Activity in OREO Balances	A summary of the activity in the OREO balances during the nine months ended September 30, 2015 and 2014 is as follows: For the nine months ended September 30, 2015 2014 Beginning balance $ $ Purchases through acquisition, at fair value — Transfers from loan portfolio, at fair value Impairments Sales Gain on sale of OREO, net Ending balance $ $

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Repurchase Agreements [Abstract]
Federal Home Loan Bank, Advances	More information about FHLB advances at September 30, 2015 is detailed in the table below: Maturity Year September 30, 2015 Rate 2016 $ % 2018 $ % 2020 $ %

FDIC Loss Sharing Income - (Tab

FDIC Loss Sharing Income - (Tables)	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Schedule of Additional Details of Company's FDIC Loss Sharing Income	The table below provides additional details of the Company’s FDIC loss sharing income (expense) during the three and nine months ended September 30, 2015 and 2014: For the three months ended For the nine months ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Clawback liability amortization $ $ $ $ Clawback liability remeasurement Reimbursement to FDIC for gain on sale of and income from covered OREO Reimbursement to FDIC for recoveries FDIC reimbursement of covered asset resolution costs Total $ $ $ $

Stock-based Compensation and 39

Stock-based Compensation and Employee Benefits - (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	The following table summarizes stock option activity for the nine months ended September 30, 2015: Weighted Average Weighted Remaining Average Contractual Aggregate Exercise Term in Intrinsic Options Price Years Value Outstanding at December 31, 2014 $ $ Granted Forfeited Surrendered Exercised Expired Outstanding at September 30, 2015 $ $ Options fully vested and exercisable at September 30, 2015 $ $ — Options expected to vest $ $
Summary of Restricted Stock Activity	The following table summarizes restricted stock activity for the nine months ended September 30, 2015: Total Weighted Restricted Average Grant- Shares Date Fair Value Unvested at December 31, 2014 $ Vested Granted Forfeited Surrendered Unvested at September 30, 2015 $

Warrants (Tables)

Warrants (Tables)	9 Months Ended
	Sep. 30, 2015
Warrants and Rights Note Disclosure [Abstract]
Schedule of Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model	The fair value of the warrants was estimated using a Black-Scholes option pricing model utilizing the following assumptions at the indicated dates: September 30, 2015 December 31, 2014 Risk-free interest rate % % Expected volatility % % Expected term (years) 4 - 5 5 - 6 Dividend yield % %

Income (Loss) Per Share - (Tabl

Income (Loss) Per Share - (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Income (Loss) Per Share	The following table illustrates the computation of basic and diluted income per share for the three and nine months ended September 30, 2015 and 2014: For the three months ended For the nine months ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net income $ $ $ $ Less: earnings allocated to participating securities Earnings allocated to common shareholders $ $ $ $ Weighted average shares outstanding for basic earnings per common share Dilutive effect of equity awards Dilutive effect of warrants — — — Weighted average shares outstanding for diluted earnings per common share Basic earnings per share $ $ $ $ Diluted earnings per share $ $ $ $

Derivatives - (Tables)

Derivatives - (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Information about the valuation methods used to measure fair value is provided in note 18 of the unaudited consolidated financial statements. Asset Derivatives Fair Value Liability Derivatives Fair Value Balance Sheet Balance Sheet Location September 30, 2015 December 31, 2014 Location September 30, 2015 December 31, 2014 Derivatives designated as hedging instruments Interest rate products Other assets $ $ Other liabilities $ $ Total derivatives designated as hedging instruments $ $ $ $ Derivatives not designated as hedging instruments Interest rate products Other assets $ $ Other liabilities $ $ Total derivatives not designated as hedging instruments $ $ $ $
Derivative Instruments, Gain (Loss)	The tables below present the effect of the Company’s derivative financial instruments on the unaudited consolidated statements of operations for the three and nine months ended September 30, 2015 and 2014: Location of (loss) Amount of (loss) recognized in income on derivatives Derivatives in fair value recognized in income on Three months ended September 30, For the nine months ended September 30, hedging relationships derivatives 2015 2014 2015 2014 Interest rate products Other non-interest income $ $ $ $ Total $ $ $ $ Location of gain or (loss) Amount of gain or (loss) recognized in income on derivatives recognized in income on Three months ended September 30, For the nine months ended September 30, Hedged items hedged items 2015 2014 2015 2014 Interest rate products Other non-interest income $ $ $ $ Total $ $ $ $ Derivatives not Location of (loss) Amount of (loss) recognized in income on derivatives designated as recognized in income on Three months ended September 30, For the nine months ended September 30, hedging instruments derivatives 2015 2014 2015 2014 Interest rate products Other non-interest expense $ $ $ $ Total $ $ $ $

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Total Unfunded Commitments	Total unfunded commitments at September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 December 31, 2014 Covered Non-covered Total Covered Non-covered Total Commitments to fund loans: Residential $ — $ $ $ — $ $ Commercial and commercial real estate — Construction and land development — — Consumer — — Credit card lines of credit — — Unfunded commitments under lines of credit Commercial and standby letters of credit Total $ $ $ $ $ $

Fair Value Measurements - (Tabl

Fair Value Measurements - (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Tables of Financial Instruments Measured At Fair Value on Recurring Basis	The tables below present the financial instruments measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 on the consolidated statements of financial condition utilizing the hierarchy structure described above: September 30, 2015 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ $ — $ Other residential MBS issued or guaranteed by U.S.Government agencies or sponsored enterprises — — Other securities — — Derivatives — — Total assets at fair value $ — $ $ $ Liabilities: Warrant liability $ — $ — $ $ Clawback liability — — Derivatives — — Total liabilities at fair value $ — $ $ $ December 31, 2014 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ $ — $ Other residential MBS issued or guaranteed by U.S.Government agencies or sponsored enterprises — — Other securities — — Derivatives — — Total assets at fair value $ — $ $ $ Liabilities: Warrant liability $ — $ — $ $ Clawback liability — — Derivatives — — Total liabilities at fair value $ — $ $ $
Table of Changes in Level 3 Financial Instruments	The table below details the changes in level 3 financial instruments during the nine months ended September 30, 2015 and September 30, 2014: Other Warrant Clawback Securities liability liability Balance at December 31, 2013 $ $ $ Change in value — Amortization — — Net change in Level 3 — Balance at September 30, 2014 $ $ $ Balance at December 31, 2014 $ $ $ Change in value Purchases through acquisition — — Amortization — — Net change in Level 3 Balance at September 30, 2015 $ $ $
Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy	The table below provides information regarding the assets recorded at fair value on a non-recurring basis during the nine months ended September 30, 2015 and 2014: September 30, 2015 Total Losses from fair value changes Other real estate owned $ $ Impaired loans Premises and equipment September 30, 2014 Total Losses from fair value changes Other real estate owned $ $ Impaired loans
Table of Valuation Techniques and Unobservable Inputs Used in Valuation of Financial Instruments Falling Within Level 3 of Fair Value Hierarchy	These valuations utilize third party appraisal or broker price opinions, and are classified as level 3 due to the significant judgment involved: Fair value at Quantitative September 30, 2015 Valuation Technique Unobservable Input Measures Other securities $ Cash investment in private equity fund, Par value Cash and CD investment par value Impaired loans Appraised value Appraised values Discount rate 0% - 25% Clawback liability Contractually defined discounted cash flows Intrinsic loss estimates $323.3 million - $405.0 million Expected credit losses — Discount rate 4% Warrant liability Black-Scholes Volatility 21% - 28%

Fair Value of Financial Instr45

Fair Value of Financial Instruments - (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	The fair value of financial instruments at September 30, 2015 and December 31, 2014, including methods and assumptions utilized for determining fair value of financial instruments, are set forth below: Level in fair value September 30, 2015 December 31, 2014 measurement Carrying Estimated Carrying Estimated hierarchy amount fair value amount fair value ASSETS Cash and cash equivalents Level 1 $ $ $ $ Securities purchased under agreements to resell Level 2 — — Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 Other available-for-sale securities Level 3 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 Capital stock of FHLB Level 2 Capital stock of FRB Level 2 Loans receivable, net Level 3 Loans held-for-sale Level 2 Accrued interest receivable Level 2 Derivatives Level 2 LIABILITIES Deposit transaction accounts Level 2 Time deposits Level 2 Securities sold under agreements to repurchase Level 2 Federal Home Loan Bank advances Level 2 Due to FDIC Level 3 Warrant liability Level 3 Accrued interest payable Level 2 Derivatives Level 2

Basis of Presentation - (Detail

Basis of Presentation - (Details) - item	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Accounting Policies [Abstract]
Number Of Full Service Banking Offices		97
Income tax rate	(2821.40%)	(570.00%)

Acquisition Activities - (Narra

Acquisition Activities - (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 01, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Bargain purchase gain		$ 1,048	$ 1,048
Amortization and accretion of purchase discounts and premiums			(3,229)	$ (3,828)
Pine River Bank Corporation [Member]
Business Acquisition [Line Items]
Cash	$ 9,482
Bargain purchase gain	1,048
Core deposit intangible asset	$ 948
Amortization period for core deposit intangible	7 years
Gross contractual amounts receivable	$ 79,000
Loans not expected to be collected	1,400
Recorded fair value	$ 64,300
Acquisition related expenses			500
Amortization and accretion of purchase discounts and premiums			75
Amortization of acquired identifiable intangibles			23
Pro forma information
Total revenue			136,700	146,200
Net income			$ 900	$ 6,600
Basic earnings per share (in dollars per share)			$ 0.03	$ 0.15
Diluted earnings per share (in dollars per share)			$ 0.03	$ 0.15

Acquisition Activities - (Summa

Acquisition Activities - (Summary of Net Assets Acquired) (Details) - USD ($) $ in Thousands	Aug. 01, 2015	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Liabilities:
Non-interest bearing demand deposits		$ 820,269	$ 820,269	$ 732,580
Interest bearing demand deposits		408,341	408,341	386,121
Savings and money market		1,390,054	1,390,054	1,290,436
Time deposits		1,255,973	1,255,973	$ 1,357,051
Consideration:
Gain on bargain purchase		$ 1,048	$ 1,048
Pine River Bank Corporation [Member]
Assets:
Cash and due from banks	$ 32,314
Investment secruities available-for-sale (at fair value)	31,866
Non-marketable securities	259
Loans, net	64,279
Other real estate owned	1,488
Premises and equipment, net	3,164
Core deposit intangible asset	948
Other assets	7,749
Total assets aquired	142,067
Liabilities:
Non-interest bearing demand deposits	41,432
Interest bearing demand deposits	19,632
Savings and money market	35,460
Time deposits	33,619
Total deposits	130,143
Other liabilities	1,394
Total liabilities assumed	131,537
Net identifiable net assets acquired	10,530
Consideration:
Cash	9,482
Gain on bargain purchase	$ 1,048

Investment Securities - (Narrat

Investment Securities - (Narrative) (Detail) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2014USD ($)	Sep. 30, 2015USD ($)security	Dec. 31, 2014USD ($)security	Aug. 01, 2015USD ($)
Investment securities total		$ 1,700,000	$ 2,000,000
Available-for-sale securities		1,244,267	1,479,214
Held-to-maturity securities		$ 445,069	$ 530,590
Mortgage-backed securities as percentage of available-for-sale investment portfolio		100.00%	100.00%
Number of securities | security		52	62
Fair value of available-for-sale securities in an unrealized loss position		$ 623,372	$ 845,988
Fair value of available-for-sale investment securities pledged as collateral		300,000	$ 300,000
Proceeds from sales of investment securities available-for-sale		$ 29,748
Estimated weighted average life of the available-for-sale mortgage-backed securities portfolio		3 years 6 months	3 years 6 months
Other securities having a maturity date between October 2015 and October 2017		$ 1,700
Other securities having no contractual maturity date		$ 800
Number of held-to-maturity securities in unrealized loss positions | security		7	12
Fair value of held-to-maturity securities in an unrealized loss position		$ 50,277	$ 110,278
Held-to-maturity investment securities pledged as collateral		$ 120,100	$ 88,300
Estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio		3 years 6 months	3 years 4 months 24 days
Pine River Bank Corporation [Member]
Available-for-sale securities acquired				$ 31,866
Proceeds from sales of investment securities available-for-sale	$ 29,800

Investment Securities - (Summar

Investment Securities - (Summary of Available-for-Sale Investment Securities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,241,721	$ 1,484,497
Gross unrealized gains	15,106	16,478
Gross unrealized losses	(12,560)	(21,761)
Investment securities available-for-sale (at fair value)	1,244,267	1,479,214
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	327,281	395,244
Gross unrealized gains	9,091	9,014
Gross unrealized losses		(43)
Investment securities available-for-sale (at fair value)	336,372	404,215
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	911,902	1,088,834
Gross unrealized gains	6,015	7,464
Gross unrealized losses	(12,560)	(21,718)
Investment securities available-for-sale (at fair value)	905,357	1,074,580
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,538	419
Investment securities available-for-sale (at fair value)	$ 2,538	$ 419

Investment Securities - (Summ51

Investment Securities - (Summary of Unrealized Losses) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value		$ 88,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2,053)
12 months or more, Fair Value	$ 623,372	757,117
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12,560)	(19,708)
Total, Fair Value	623,372	845,988
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(12,560)	(21,761)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value		17
12 months or more, Fair Value		89,749
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(43)
Total, Fair Value		89,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		(43)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value		88,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2,053)
12 months or more, Fair Value	623,372	667,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12,560)	(19,665)
Total, Fair Value	623,372	756,222
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (12,560)	$ (21,718)

Investment Securities - (Summ52

Investment Securities - (Summary of Held-to-maturity Investment Securities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 445,069	$ 530,590
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	6,159	5,990
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,080)	(1,943)
Fair value	450,148	534,637
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	353,026	422,622
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,801	5,773
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(15)	(72)
Fair value	358,812	428,323
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	92,043	107,968
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	358	217
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,065)	(1,871)
Fair value	$ 91,336	$ 106,314

Investment Securities - (Summ53

Investment Securities - (Summary of Held-to-Maturity Securities, Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 973
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)
Fair Value, 12 months or more	49,304	$ 110,278
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,077)	(1,943)
Total Fair Value	50,277	110,278
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,080)	(1,943)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	973
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)
Fair Value, 12 months or more	1,046	35,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12)	(72)
Total Fair Value	2,019	35,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(15)	(72)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, 12 months or more	48,258	75,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,065)	(1,871)
Total Fair Value	48,258	75,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,065)	$ (1,871)

Loans - Narrative Section (Deta

Loans - Narrative Section (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)security	Aug. 01, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)
Debt Instrument [Line Items]
Covered Loans Percentage	6.10%		9.00%
Fees and cost related to loans	$ 8,600		$ 10,500
Carrying amount of loan investments	2,523,128		2,162,409	$ 2,171,372
Energy Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	147,500		161,800
Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,018,626		795,396
Commercial Banking [Member]
Debt Instrument [Line Items]
Loans And Leases Receivable, Tax Exempt	311,000		112,600
Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,302,236		1,882,764
Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	999,400		772,440
ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	220,892		279,645
ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	19,226		22,956
Pine River Bank Corporation [Member]
Debt Instrument [Line Items]
Loans acquired		$ 64,279
Total Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,523,128		2,162,409
Recorded investment, non-accrual status	28,645		10,813
Total Loans [Member] | Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,302,236		1,882,764
Recorded investment, non-accrual status	28,645		10,813
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	999,400		772,440
Recorded investment, non-accrual status	20,339		4,215
Total Loans [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	220,892		279,645
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	19,226		22,956
Total Loans [Member] | Substandard [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	165,794		165,941
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 68,116		39,626
Number of commercial standard loans | security	4
Increase in carrying amount of loan investments	$ 28,800
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]
Debt Instrument [Line Items]
Number of commercial standard loans | security	2
Increase in carrying amount of loan investments	$ 12,000
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	48,906		19,250
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	97,678		126,315
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 9,775		$ 11,092

Loans - Impaired Loans Narrativ

Loans - Impaired Loans Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)item	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 2,523,128	$ 2,162,409	$ 2,171,372
Recorded investment of impaired loans	50,506	32,091
Impaired loans which were covered by FDIC loss sharing agreement	$ 155,056	193,697
Number of loans resulting in increase to impaired loans | item	3
Loans impaired in period	$ 19,000
Collective related allowance for loan losses for impaired loans	3,253	279
Discounted Cash Flows [Member]
Debt Instrument [Line Items]
Impaired loans	9,900
Fair Value Of Collateral Pledged [Member]
Debt Instrument [Line Items]
Impaired loans	31,500
General Reserve [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	9,100	8,900
Impaired loans	250
Covered [Member]
Debt Instrument [Line Items]
Impaired loans which were covered by FDIC loss sharing agreement	10,900	11,100
Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 1,018,626	$ 795,396

Loans - (Loan Portfolio Composi

Loans - (Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30 and Loans Covered by the FDIC Loss Sharing Agreements) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Loans [Line Items]
Total Loans	$ 2,523,128	$ 2,162,409	$ 2,171,372
Loans receivable, net - covered	$ 155,056	$ 193,697
Covered Loans Percentage	6.10%	9.00%
% of Total	100.00%	100.00%
Covered [Member]
Loans [Line Items]
Loans receivable, net - covered	$ 155,056	$ 193,697
Covered Loans Percentage	6.10%	9.00%
Non-Covered [Member]
Loans [Line Items]
Total Loans	$ 2,368,072	$ 1,968,712
% of Total	93.90%	91.00%
Commercial Loan [Member]
Loans [Line Items]
Total Loans	$ 1,018,626	$ 795,396
% of Total	40.40%	36.80%
Agriculture [Member]
Loans [Line Items]
Total Loans	$ 149,027	$ 137,531
% of Total	5.90%	6.40%
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	$ 634,255	$ 561,594
% of Total	25.10%	26.00%
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	$ 686,450	$ 632,700
% of Total	27.20%	29.20%
Consumer [Member]
Loans [Line Items]
Total Loans	$ 34,770	$ 35,188
% of Total	1.40%	1.60%
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	$ 2,302,236	$ 1,882,764
Non ASC 310-30 [Member] | Covered [Member]
Loans [Line Items]
Loans receivable, net - covered	26,767	32,821
Non ASC 310-30 [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	2,275,469	1,849,943
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	999,400	772,440
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	131,119	118,468
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	480,709	369,264
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	659,475	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	31,533	30,653
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	220,892	279,645
ASC 310-30 [Member] | Covered [Member]
Loans [Line Items]
Loans receivable, net - covered	128,289	160,876
ASC 310-30 [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	92,603	118,769
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	19,226	22,956
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	17,908	19,063
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	153,546	192,330
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	26,975	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	$ 3,237	$ 4,535

Loans - (Loan Delinquency) (Det

Loans - (Loan Delinquency) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Loans [Line Items]
Total loans	$ 2,523,128	$ 2,162,409	$ 2,171,372
Commercial Loan [Member]
Loans [Line Items]
Total loans	1,018,626	795,396
Agriculture [Member]
Loans [Line Items]
Total loans	149,027	137,531
Commercial Real Estate [Member]
Loans [Line Items]
Total loans	634,255	561,594
Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	686,450	632,700
Consumer [Member]
Loans [Line Items]
Total loans	34,770	35,188
Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	2,302,236	1,882,764
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	999,400	772,440
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total loans	131,119	118,468
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	480,709	369,264
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	659,475	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	31,533	30,653
ASC 310-30 [Member]
Loans [Line Items]
Total loans	220,892	279,645
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	19,226	22,956
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total loans	17,908	19,063
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	153,546	192,330
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	26,975	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	3,237	4,535
Non-Covered [Member]
Loans [Line Items]
Total loans	2,368,072	1,968,712
Non-Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	2,275,469	1,849,943
Non-Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total loans	92,603	118,769
Total Loans [Member]
Loans [Line Items]
30-59 days past due	2,933	4,541
60-89 days past due	3,092	5,518
Greater than 90 days past due	22,634	35,358
Total past due	28,659	45,417
Current	2,494,469	2,116,992
Total loans	2,523,128	2,162,409
Loans 90 days past due and still accruing	19,208	34,097
Non- accrual	28,645	10,813
Total Loans [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due	1,841	1,442
60-89 days past due	2,148	1,600
Greater than 90 days past due	3,692	1,523
Total past due	7,681	4,565
Current	2,294,555	1,878,199
Total loans	2,302,236	1,882,764
Loans 90 days past due and still accruing	266	263
Non- accrual	28,645	10,813
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
30-59 days past due	34
Total past due	34
Current	24,607	11,748
Total loans	24,641	11,748
Non- accrual	58
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
30-59 days past due		41
Total past due		41
Current	3,681	4,532
Total loans	3,681	4,573
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Current	17,216	10,856
Total loans	17,216	10,856
Loans 90 days past due and still accruing		(1)
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
30-59 days past due		336
60-89 days past due		78
Greater than 90 days past due	94	101
Total past due	94	515
Current	170,915	119,710
Total loans	171,009	120,225
Non- accrual	756	843
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
30-59 days past due	100	158
Greater than 90 days past due	829	222
Total past due	929	380
Current	263,233	221,482
Total loans	264,162	221,862
Non- accrual	876	222
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
30-59 days past due	134	535
60-89 days past due		78
Greater than 90 days past due	923	323
Total past due	1,057	936
Current	479,652	368,328
Total loans	480,709	369,264
Loans 90 days past due and still accruing		(1)
Non- accrual	1,690	1,065
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
30-59 days past due	1,117	378
60-89 days past due	676	1,403
Greater than 90 days past due	1,549	732
Total past due	3,342	2,513
Current	601,372	537,022
Total loans	604,714	539,535
Loans 90 days past due and still accruing	92
Non- accrual	3,999	4,335
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
30-59 days past due	209	133
60-89 days past due	123	1
Greater than 90 days past due	142	101
Total past due	474	235
Current	54,287	52,169
Total loans	54,761	52,404
Loans 90 days past due and still accruing	82
Non- accrual	464	476
Total Loans [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due		17
60-89 days past due		1,016
Greater than 90 days past due	978	152
Total past due	978	1,185
Current	25,790	31,636
Total loans	26,768	32,821
Loans 90 days past due and still accruing		75
Non- accrual	1,088	1,317
Total Loans [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due	1,841	1,425
60-89 days past due	2,148	584
Greater than 90 days past due	2,714	1,371
Total past due	6,703	3,380
Current	2,268,765	1,846,563
Total loans	2,275,468	1,849,943
Loans 90 days past due and still accruing	266	188
Non- accrual	27,557	9,496
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
30-59 days past due	231	83
60-89 days past due	50	97
Greater than 90 days past due	1,044	318
Total past due	1,325	498
Current	998,075	771,942
Total loans	999,400	772,440
Loans 90 days past due and still accruing	92	215
Non- accrual	20,339	4,215
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
30-59 days past due	59	47
60-89 days past due	1,289
Greater than 90 days past due	34	10
Total past due	1,382	57
Current	129,737	118,411
Total loans	131,119	118,468
Loans 90 days past due and still accruing		10
Non- accrual	2,123	495
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
30-59 days past due	1,326	511
60-89 days past due	799	1,404
Greater than 90 days past due	1,691	833
Total past due	3,816	2,748
Current	655,659	589,191
Total loans	659,475	591,939
Loans 90 days past due and still accruing	174
Non- accrual	4,463	4,811
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
30-59 days past due	91	266
60-89 days past due	10	21
Greater than 90 days past due		39
Total past due	101	326
Current	31,432	30,327
Total loans	31,533	30,653
Loans 90 days past due and still accruing		39
Non- accrual	30	227
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due	1,092	3,099
60-89 days past due	944	3,918
Greater than 90 days past due	18,942	33,835
Total past due	20,978	40,852
Current	199,914	238,793
Total loans	220,892	279,645
Loans 90 days past due and still accruing	18,942	33,834
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
30-59 days past due	298	152
Greater than 90 days past due	311	1,755
Total past due	609	1,907
Current	18,617	21,049
Total loans	19,226	22,956
Loans 90 days past due and still accruing	311	1,754
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
30-59 days past due	133
60-89 days past due	944
Greater than 90 days past due	152	367
Total past due	1,229	367
Current	16,679	18,696
Total loans	17,908	19,063
Loans 90 days past due and still accruing	152	367
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
30-59 days past due	522	564
60-89 days past due		92
Greater than 90 days past due	16,287	31,013
Total past due	16,809	31,669
Current	136,737	160,661
Total loans	153,546	192,330
Loans 90 days past due and still accruing	16,286	31,013
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
30-59 days past due	85	2,014
60-89 days past due		3,826
Greater than 90 days past due	2,171	646
Total past due	2,256	6,486
Current	24,719	34,275
Total loans	26,975	40,761
Loans 90 days past due and still accruing	2,172	646
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
30-59 days past due	54	369
Greater than 90 days past due	21	54
Total past due	75	423
Current	3,162	4,112
Total loans	3,237	4,535
Loans 90 days past due and still accruing	21	54
Total Loans [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
30-59 days past due	845	576
60-89 days past due	944	3,892
Greater than 90 days past due	17,816	31,239
Total past due	19,605	35,707
Current	108,683	125,169
Total loans	128,288	160,876
Loans 90 days past due and still accruing	17,816	31,238
Total Loans [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
30-59 days past due	247	2,523
60-89 days past due		26
Greater than 90 days past due	1,126	2,596
Total past due	1,373	5,145
Current	91,231	113,624
Total loans	92,604	118,769
Loans 90 days past due and still accruing	1,126	2,596
Total Loans [Member] | Covered [Member]
Loans [Line Items]
30-59 days past due	845	593
60-89 days past due	944	4,908
Greater than 90 days past due	18,794	31,391
Total past due	20,583	36,892
Current	134,473	156,805
Total loans	155,056	193,697
Loans 90 days past due and still accruing	17,816	31,313
Non- accrual	1,088	1,317
Total Loans [Member] | Non-Covered [Member]
Loans [Line Items]
30-59 days past due	2,088	3,948
60-89 days past due	2,148	610
Greater than 90 days past due	3,840	3,967
Total past due	8,076	8,525
Current	2,359,996	1,960,187
Total loans	2,368,072	1,968,712
Loans 90 days past due and still accruing	1,392	2,784
Non- accrual	27,557	9,496
Total Loans [Member] | Covered And Non-covered [Member]
Loans [Line Items]
30-59 days past due	2,933	4,541
60-89 days past due	3,092	5,518
Greater than 90 days past due	22,634	35,358
Total past due	28,659	45,417
Current	2,494,469	2,116,992
Total loans	2,523,128	2,162,409
Loans 90 days past due and still accruing	19,208	34,097
Non- accrual	$ 28,645	$ 10,813

Loans - (Credit Exposure for Lo

Loans - (Credit Exposure for Loans as Determined by Company's Internal Risk Rating System) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Loans [Line Items]
Total Loans	$ 2,523,128	$ 2,162,409	$ 2,171,372
Agriculture [Member]
Loans [Line Items]
Total Loans	149,027	137,531
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	686,450	632,700
Consumer [Member]
Loans [Line Items]
Total Loans	34,770	35,188
Commercial Loan [Member]
Loans [Line Items]
Total Loans	1,018,626	795,396
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	634,255	561,594
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,302,236	1,882,764
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	131,119	118,468
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	659,475	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	31,533	30,653
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	999,400	772,440
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	480,709	369,264
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	220,892	279,645
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	17,908	19,063
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	26,975	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	3,237	4,535
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	19,226	22,956
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	153,546	192,330
Non-Covered [Member]
Loans [Line Items]
Total Loans	2,368,072	1,968,712
Non-Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,275,469	1,849,943
Non-Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	92,603	118,769
Total Loans [Member]
Loans [Line Items]
Total Loans	2,523,128	2,162,409
Total Loans [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,302,236	1,882,764
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	24,641	11,748
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	3,681	4,573
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	17,216	10,856
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	171,009	120,225
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	264,162	221,862
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	480,709	369,264
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	131,119	118,468
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	604,714	539,535
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	54,761	52,404
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	659,475	591,939
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	31,533	30,653
Total Loans [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	26,768	32,821
Total Loans [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,275,468	1,849,943
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	999,400	772,440
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	220,892	279,645
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	17,908	19,063
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	26,975	40,761
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	3,237	4,535
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	19,226	22,956
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	153,546	192,330
Total Loans [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	128,288	160,876
Total Loans [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	92,604	118,769
Total Loans [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,272,104	1,958,078
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,162,026	1,814,873
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	21,113	11,748
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	3,681	4,573
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	17,216	10,856
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	161,637	115,178
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	250,768	199,817
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	454,415	342,172
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	120,138	114,642
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	598,228	533,630
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	53,230	51,059
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	651,458	584,689
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	31,388	30,426
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	15,579	21,240
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,146,447	1,793,633
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	904,627	742,944
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	110,078	143,205
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	10,053	16,854
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	19,438	29,069
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	2,774	3,641
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	9,060	11,038
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	68,753	82,603
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	35,474	49,856
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	74,604	93,349
Total Loans [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	78,207	33,629
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	68,840	28,039
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	3,049
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	4,507	158
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	9,388	17,607
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	16,944	17,765
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	8,524	85
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	482	23
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	26
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	508	23
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	69
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	159	171
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	68,681	27,868
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	42,795	10,166
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	9,367	5,590
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	5,069	30
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	1,673	1,403
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	96	105
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	391	282
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	2,138	3,770
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	6,773	3,036
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	2,594	2,554
Total Loans [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	165,794	165,941
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	68,116	39,626
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	479
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	4,865	4,889
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	4,002	4,430
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	9,346	9,319
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	2,457	3,741
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	5,826	5,744
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	1,505	1,345
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	7,331	7,089
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	76	227
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	10,916	11,301
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	57,200	28,325
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	48,906	19,250
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	97,678	126,315
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	2,786	2,179
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	5,864	10,289
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	367	789
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	9,775	11,092
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	78,886	101,966
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	82,272	103,451
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	15,406	22,864
Total Loans [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	7,023	4,761
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	3,254	226
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	4	8
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	4	8
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	178	138
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	178	138
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	114	109
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	3,140	117
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	3,072	80
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	3,769	4,535
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans		544
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	3,769	3,991
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	3,769	4,533
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans		2
Total Loans [Member] | Covered [Member]
Loans [Line Items]
Total Loans	155,056	193,697
Total Loans [Member] | Covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	51,053	71,096
Total Loans [Member] | Covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	6,932	3,207
Total Loans [Member] | Covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	93,188	114,752
Total Loans [Member] | Covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	3,883	4,642
Total Loans [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	2,368,072	1,968,712
Total Loans [Member] | Non-Covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,221,051	1,886,982
Total Loans [Member] | Non-Covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	71,275	30,422
Total Loans [Member] | Non-Covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	72,606	51,189
Total Loans [Member] | Non-Covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	3,140	119
Total Loans [Member] | Covered And Non-covered [Member]
Loans [Line Items]
Total Loans	2,523,128	2,162,409
Total Loans [Member] | Covered And Non-covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,272,104	1,958,078
Total Loans [Member] | Covered And Non-covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	78,207	33,629
Total Loans [Member] | Covered And Non-covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	165,794	165,941
Total Loans [Member] | Covered And Non-covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	$ 7,023	$ 4,761

Loans - (Additional Information

Loans - (Additional Information Regarding Impaired Loans) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans [Line Items]
Unpaid principal balance, Total	$ 52,650	$ 34,813
Recorded Investment In Acquired Impaired Loans	50,506	32,091
Loans and Leases Receivable, Allowance	3,253	279
Commercial Loan [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	20,776	16,953
Recorded investment with no related allowance recorded	20,582	16,771
Unpaid principal balance of impaired loans with an allowance recorded	15,255	894
Recorded investment of impaired loans with an allowance recorded	14,980	693
Allowance for loan losses allocated with an allowance recorded	3,065	82
Agriculture [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	1,977	3,065
Recorded investment with no related allowance recorded	1,978	3,061
Unpaid principal balance of impaired loans with an allowance recorded	257	177
Recorded investment of impaired loans with an allowance recorded	229	145
Allowance for loan losses allocated with an allowance recorded	1
Multifamily [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	38
Recorded investment of impaired loans with an allowance recorded	38
Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	1,789	1,164
Recorded investment with no related allowance recorded	1,595	970
Unpaid principal balance of impaired loans with an allowance recorded	1,595	1,321
Recorded investment of impaired loans with an allowance recorded	1,191	1,024
Allowance for loan losses allocated with an allowance recorded	2	5
Non Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	829
Recorded investment with no related allowance recorded	829
Unpaid principal balance of impaired loans with an allowance recorded	927	1,140
Recorded investment of impaired loans with an allowance recorded	823	1,060
Allowance for loan losses allocated with an allowance recorded	5	9
Total Commercial Real Estate [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	2,618	1,164
Recorded investment with no related allowance recorded	2,424	970
Unpaid principal balance of impaired loans with an allowance recorded	2,560	2,461
Recorded investment of impaired loans with an allowance recorded	2,052	2,084
Allowance for loan losses allocated with an allowance recorded	7	14
Sr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	343	694
Recorded investment with no related allowance recorded	304	248
Unpaid principal balance of impaired loans with an allowance recorded	7,083	7,360
Recorded investment of impaired loans with an allowance recorded	6,441	6,359
Allowance for loan losses allocated with an allowance recorded	169	172
Jr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	1,702	1,768
Recorded investment of impaired loans with an allowance recorded	1,438	1,515
Allowance for loan losses allocated with an allowance recorded	10	9
Residential Real Estate Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	343	694
Recorded investment with no related allowance recorded	304	248
Unpaid principal balance of impaired loans with an allowance recorded	8,785	9,128
Recorded investment of impaired loans with an allowance recorded	7,879	7,874
Allowance for loan losses allocated with an allowance recorded	179	181
Consumer [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	79	277
Recorded investment of impaired loans with an allowance recorded	78	245
Allowance for loan losses allocated with an allowance recorded	1	2
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	25,714	21,876
Recorded investment with no related allowance recorded	25,288	21,050
Impaired Loans with Related Allowance Recorded [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	26,936	12,937
Recorded investment of impaired loans with an allowance recorded	25,218	11,041
Allowance for loan losses allocated with an allowance recorded	$ 3,253	$ 279

Loans (Impaired Loans - Average

Loans (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Loans [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 51,727	$ 48,501
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,107	815
Commercial Loan [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	21,200	25,947
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	772	342
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15,096	987
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	72	6
Agriculture [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,978	9,045
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		217
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	345	165
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3
Multifamily [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	39	156
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1
Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,635	1,578
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	59	63
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,260	627
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	20	10
Non Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	829
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	852	1,086
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	39	42
Total Commercial Real Estate [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,464	1,578
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	59	63
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,151	1,869
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	60	52
Sr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	312	391
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	12	8
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,621	6,738
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	89	81
Jr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,478	1,515
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	39	45
Residential Real Estate Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	312	391
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	12	8
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,099	8,253
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	128	126
Consumer [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	82	266
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	1
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	25,954	36,961
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	843	630
Impaired Loans with Related Allowance Recorded [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25,773	11,540
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 264	$ 185

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015USD ($)item	Sep. 30, 2014USD ($)item	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Accretable yield related for loan pool	$ 19,025	$ 30,394	$ 113,463	$ 130,624
TDR’s modified within the past year that defaulted on their restructured terms | item	0	3
Carrying amount of loan investments	$ 2,523,128	$ 2,171,372	2,162,409
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
Number of restructured loans | item	14
Recorded investment	$ 20,400
Troubled Debt Restructurings [Member] | Non Accrual [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	21,400		7,000
FDIC Covered [Member]
Debt Instrument [Line Items]
Accruing troubled debt restructurings	$ 1,700		9,800
Commercial and Consumer Loans [Member]
Debt Instrument [Line Items]
Number of consumer loans | item	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 37
Accruing TDR [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Compliance Recorded Investment			10,000
Recorded investment	11,027		19,275
Covered [Member] | Non-Accruing TDR [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring Nonaccrual Loans	$ 1,032		$ 1,206

Loans - (Additional Informati62

Loans - (Additional Information Related to Accruing TDR's) (Detail) - Accruing TDR [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Loans [Line Items]
Recorded investment	$ 11,027	$ 19,275
Average year-to- date recorded investment	11,748	19,020
Unpaid principal balance	11,283	19,318
Unfunded commitments to fund TDRs	1,943	377
Commercial [Member]
Loans [Line Items]
Recorded investment	8,381	13,249
Average year-to- date recorded investment	9,038	12,496
Unpaid principal balance	8,582	13,249
Unfunded commitments to fund TDRs	1,943	375
Agriculture [Member]
Loans [Line Items]
Recorded investment	84	2,711
Average year-to- date recorded investment	85	3,110
Unpaid principal balance	87	2,715
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	388	610
Average year-to- date recorded investment	396	627
Unpaid principal balance	392	622
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	2,161	2,687
Average year-to- date recorded investment	2,214	2,767
Unpaid principal balance	2,209	2,714
Unfunded commitments to fund TDRs		2
Consumer [Member]
Loans [Line Items]
Recorded investment	13	18
Average year-to- date recorded investment	15	20
Unpaid principal balance	$ 13	$ 18

Loans - (Summary of Company's C

Loans - (Summary of Company's Carrying Value of Non-Accrual TDR's) (Detail) - Non-Accruing TDR [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Covered [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	$ 1,032	$ 1,206
Covered [Member] | Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	99	1
Covered [Member] | Agriculture [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	81	201
Covered [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s		94
Covered [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	852	910
Non-Covered [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	20,325	5,767
Non-Covered [Member] | Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	19,596	3,993
Non-Covered [Member] | Agriculture [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	34	164
Non-Covered [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s		364
Non-Covered [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	693	1,056
Non-Covered [Member] | Consumer [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	$ 2	$ 190

Loans - (Re-Measurement of Loan

Loans - (Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield beginning balance	$ 113,463	$ 130,624
Reclassification from non-accretable difference	(3,745)	(1,264)
Reclassification to non-accretable difference	(35,728)	(46,646)
Accretion	93,015	113,108
Accretable yield ending balance	$ 19,025	$ 30,394

Loans - (Composition of Net Boo

Loans - (Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Receivables [Abstract]
Contractual cash flows	$ 657,451	$ 751,932
Non-accretable difference	(343,544)	(358,824)
Accretable yield	(93,015)	(113,463)
Loans accounted for under ASC 310-30	$ (220,892)	$ (279,645)

Allowance for Loan Losses - (Su

Allowance for Loan Losses - (Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 20,241	$ 15,572	$ 17,613	$ 12,521
Provision for loan losses			7,021	4,944
Ending balance	23,827	16,591	23,827	16,591
Ending allowance balance					$ 23,827
Total ending allowance balance	20,241	15,572	17,613	12,521	23,827	$ 17,613	$ 16,591
Total Loans					2,523,128	2,162,409	2,171,372
Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,476	14,474	16,892	11,241
Charge-offs	(212)	(786)	(1,226)	(1,622)
Recoveries	88	290	433	786
Provision for loan losses	3,600	1,706	6,853	5,279
Ending balance	22,952	15,684	22,952	15,684
Ending allowance balance individually evaluated for impairment					3,254		293
Ending allowance balance collectively evaluated for impairment					19,698		15,391
Total ending allowance balance	19,476	14,474	16,892	11,241	22,952	16,892	15,684
Loans individually evaluated for impairment					50,507		47,226
Loans collectively evaluated for impairment					2,251,729		1,803,553
Total Loans					2,302,236	1,882,764
ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	765	1,098	721	1,280
Charge-offs			(14)	(38)
Provision for loan losses	110	(191)	168	(335)
Ending balance	875	907	875	907
Ending allowance balance					875		907
Total ending allowance balance	765	1,098	721	1,280	875	721	907
Loans					220,892		320,593
Total Loans					220,892	279,645
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,044	6,421	8,598	4,258
Ending balance	12,724	7,383	12,724	7,383
Ending allowance balance					12,724
Total ending allowance balance	10,044	6,421	8,598	4,258	12,724	8,598	7,383
Total Loans					1,018,626		755,172
Commercial Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,024	6,420	8,598	4,029
Charge-offs	(12)	(86)	(17)	(498)
Recoveries	7	189	55	306
Provision for loan losses	2,624	859	4,007	3,545
Ending balance	12,643	7,382	12,643	7,382
Ending allowance balance individually evaluated for impairment					3,065		39
Ending allowance balance collectively evaluated for impairment					9,578		7,343
Total ending allowance balance	10,024	6,420	8,598	4,029	12,643	8,598	7,382
Loans individually evaluated for impairment					35,562		25,776
Loans collectively evaluated for impairment					963,838		691,731
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	20	1		229
Charge-offs				(2)
Provision for loan losses	61		81	(226)
Ending balance	81	1	81	1
Ending allowance balance					81		1
Total ending allowance balance	20	1	81	229	81		1
Loans					19,226		37,665
Agriculture [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,305	1,407	1,009	1,237
Ending balance	1,516	1,333	1,516	1,333
Ending allowance balance					1,516
Total ending allowance balance	1,305	1,407	1,009	1,237	1,516	1,009	1,333
Total Loans					149,027		162,872
Agriculture [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	693	610	541	572
Charge-offs			(47)
Recoveries		8	7	8
Provision for loan losses	124	102	316	140
Ending balance	817	720	817	720
Ending allowance balance individually evaluated for impairment					1
Ending allowance balance collectively evaluated for impairment					816		720
Total ending allowance balance	693	610	541	572	817	541	720
Loans individually evaluated for impairment					2,207		9,460
Loans collectively evaluated for impairment					128,912		133,341
Agriculture [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	612	797	468	665
Provision for loan losses	87	(184)	231	(52)
Ending balance	699	613	699	613
Ending allowance balance					699		613
Total ending allowance balance	612	797	468	665	699	468	613
Loans					17,908		20,071
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,830	2,969	3,819	2,276
Ending balance	4,359	3,144	4,359	3,144
Ending allowance balance					4,359
Total ending allowance balance	3,830	2,969	3,819	2,276	4,359	3,819	3,144
Total Loans					634,255		594,316
Commercial Real Estate Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,704	2,735	3,597	1,984
Charge-offs			(222)
Recoveries	11	16	135	70
Provision for loan losses	555	166	760	863
Ending balance	4,270	2,917	4,270	2,917
Ending allowance balance individually evaluated for impairment					8		31
Ending allowance balance collectively evaluated for impairment					4,262		2,886
Total ending allowance balance	3,704	2,735	3,597	1,984	4,270	3,597	2,917
Loans individually evaluated for impairment					4,477		3,325
Loans collectively evaluated for impairment					476,232		377,120
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	126	234	222	292
Provision for loan losses	(37)	(7)	(133)	(65)
Ending balance	89	227	89	227
Ending allowance balance					89		227
Total ending allowance balance	126	234	222	292	89	222	227
Loans					153,546		213,871
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,649	4,310	3,771	4,259
Ending balance	4,831	4,200	4,831	4,200
Ending allowance balance					4,831
Total ending allowance balance	4,649	4,310	3,771	4,259	4,831	3,771	4,200
Total Loans					686,450		623,399
Residential Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,647	4,244	3,743	4,165
Charge-offs	(26)	(470)	(200)	(539)
Recoveries	18	22	46	197
Provision for loan losses	192	338	1,242	311
Ending balance	4,831	4,134	4,831	4,134
Ending allowance balance individually evaluated for impairment					179		220
Ending allowance balance collectively evaluated for impairment					4,652		3,914
Total ending allowance balance	4,647	4,244	3,743	4,165	4,831	3,743	4,134
Loans individually evaluated for impairment					8,183		8,415
Loans collectively evaluated for impairment					651,292		571,005
Residential Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2	66	28	94
Provision for loan losses	(2)		(28)	(28)
Ending balance		66		66
Ending allowance balance							66
Total ending allowance balance	2	66	28	94		28	66
Loans					26,975		43,979
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	413	465	416	491
Ending balance	397	531	397	531
Ending allowance balance					397
Total ending allowance balance	413	465	416	491	397	416	531
Total Loans					34,770		35,613
Consumer Loan [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	408	465	413	491
Charge-offs	(174)	(230)	(740)	(585)
Recoveries	52	55	190	205
Provision for loan losses	105	241	528	420
Ending balance	391	531	391	531
Ending allowance balance individually evaluated for impairment					1		3
Ending allowance balance collectively evaluated for impairment					390		528
Total ending allowance balance	408	$ 465	413	491	391	413	531
Loans individually evaluated for impairment					78		250
Loans collectively evaluated for impairment					31,455		30,356
Consumer Loan [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5		3
Charge-offs			(14)	(36)
Provision for loan losses	1		17	$ 36
Ending balance	6		6
Ending allowance balance					6
Total ending allowance balance	$ 5		$ 3		6	$ 3
Loans					$ 3,237		$ 5,007

Allowance for Loan Losses - (Na

Allowance for Loan Losses - (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses			$ (7,021)	$ (4,944)
Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Allowance for Loan and Lease Losses Write-offs, Net	$ 100	$ 500	800	800
Provision for loan losses	(3,600)	(1,706)	(6,853)	(5,279)
ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(110)	191	(168)	335
Commercial Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(2,624)	(859)	(4,007)	(3,545)
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(61)		(81)	226
Residential Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(192)	(338)	(1,242)	(311)
Residential Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	2		28	28
Consumer Loan [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(105)	(241)	(528)	(420)
Consumer Loan [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(1)		(17)	(36)
Agriculture [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(124)	(102)	(316)	(140)
Agriculture [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(87)	184	(231)	52
Commercial Real Estate Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(555)	(166)	(760)	(863)
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	$ 37	$ 7	$ 133	$ 65

FDIC Indemnification Asset - (S

FDIC Indemnification Asset - (Summary of Activity Related to FDIC Indemnification Asset) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period			$ 39,082	$ 64,447
Amortization	$ (5,798)	$ (6,252)	(20,751)	(19,819)
FDIC portion of recoveries exceeding fair value marks			(2,819)	(34)
Change in carrying value of indemnification asset due to loss share submissions			2,643	(181)
Balance at end of period	$ 18,155	$ 44,413	$ 18,155	$ 44,413

FDIC Indemnification Asset - (N

FDIC Indemnification Asset - (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Banking and Thrift [Abstract]
Amortization	$ (5,798)	$ (6,252)	$ (20,751)	$ (19,819)
Decrease in carrying value of FDIC indemnification asset			(2,643)	181
Payments/receipts to/from FDIC related to loss share assets			$ 2,600	$ (181)

Other Real Estate Owned - (Summ

Other Real Estate Owned - (Summary of Activity in OREO Balances) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other Real Estate [Roll Forward]
Balance	$ 29,120	$ 70,125
Purchases through acquisiton at fair value	1,488
Transfers from loan portfolio, at fair value	1,143	2,519
Impairments	(799)	(1,789)
Sales	(14,260)	(27,656)
Gain on sale of OREO, net	2,342	2,686
Balance	$ 19,034	$ 45,885

Other Real Estate Owned - (Narr

Other Real Estate Owned - (Narrative) (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
OREO balance	$ 19,034	$ 29,120	$ 45,885	$ 70,125
Amount covered by the loss sharing agreements with the FDIC	$ 11,400	$ 18,500
Percentage covered by the loss sharing agreements with the FDIC	60.00%	63.40%
Minority interests in OREO which are held by outside banks	$ 5,500	$ 8,100

Borrowings (Narrative) (Detail)

Borrowings (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Disclosure of Repurchase Agreements [Abstract]
FHLB advances	$ 40,000	$ 40,000	$ 40,000
Interest expense related to FHLB advances	$ 167	$ 498

Borrowings (Federal Home Loan B

Borrowings (Federal Home Loan Bank, Advances) (Details) $ in Thousands	Sep. 30, 2015USD ($)
December 31, 2014 balance
2,016	$ 15,000
2,018	10,000
2,020	$ 15,000
Rate
2,016	0.84%
2,018	1.81%
2,020	2.33%

Regulatory Capital - (Capital R

Regulatory Capital - (Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Required to be considered well capitalized Ratio, leverage ratio	5.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio	8.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio	10.00%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-based capital computations	20.00%	20.00%
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	11.50%	15.00%
Common equity risk-based ratio	18.80%
Risk-based capital Ratio	18.80%	28.90%
Total risk-based capital Ratio	19.60%	29.60%
Leverage Amount	$ 547,307	$ 712,222
Common equity risk-based amount	547,307
Risk-based capital amount	547,307	712,222
Total risk-based capital Amount	$ 571,495	$ 730,086
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio	8.00%	6.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio	10.00%	10.00%
Required to be considered well capitalized common equity capital amount	$ 39,283
Required to be considered well capitalized risk-based capital Amount	233,467	$ 147,796
Required to be considered well capitalized Total risk-based capital Amount	$ 291,833	$ 246,326
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	4.50%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	6.00%	4.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	8.00%	8.00%
Required to be considered adequately capitalized leverage Amount	$ 190,328	$ 190,148
Required to be considered adequately capitalized common equity capital amount	214,119
Required to be considered adequately capitalized risk-based capital Amount	175,100	98,530
Required to be considered adequately capitalized Total risk-based capital Amount	$ 233,467	$ 197,061
NBH Bank, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	10.90%	12.10%
Common equity risk-based ratio	17.80%
Risk-based capital Ratio	17.80%	23.50%
Total risk-based capital Ratio	18.60%	24.20%
Leverage Amount	$ 515,047	$ 573,934
Common equity risk-based amount	515,047
Risk-based capital amount	515,047	573,934
Total risk-based capital Amount	$ 539,236	$ 591,799
Required to be considered well capitalized Ratio, leverage ratio	10.00%	10.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio	11.00%	11.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio	12.00%	12.00%
Required to be considered well capitalized leverage Amount	$ 474,026	$ 473,478
Required to be considered well capitalized common equity capital amount	308,117
Required to be considered well capitalized risk-based capital Amount	319,032	268,855
Required to be considered well capitalized Total risk-based capital Amount	$ 348,035	$ 293,297
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	4.50%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	6.00%	4.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	8.00%	8.00%
Required to be considered adequately capitalized leverage Amount	$ 189,610	$ 189,391
Required to be considered adequately capitalized common equity capital amount	213,312
Required to be considered adequately capitalized risk-based capital Amount	174,018	97,766
Required to be considered adequately capitalized Total risk-based capital Amount	$ 232,024	$ 195,531

Regulatory Capital - (Narrative

Regulatory Capital - (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio		6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio		8.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio		10.00%
Required to be considered well capitalized Ratio, leverage ratio		5.00%
Approval from bank regulators to permanently reduce capital		$ 86
Cash dividends paid	$ 86
NBH Bank, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital Ratio		18.60%	24.20%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio		6.50%
Required to be considered adequately capitalized Ratio, risk-based capital ratio		6.00%	4.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio		8.00%	8.00%
Required to be considered adequately capitalized Ratio, leverage ratio		4.00%	4.00%
Required to be considered well capitalized Ratio, risk-based capital ratio		11.00%	11.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio		12.00%	12.00%
Required to be considered well capitalized Ratio, leverage ratio		10.00%	10.00%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-based capital computations		20.00%	20.00%

FDIC Loss Sharing Income - (Sch

FDIC Loss Sharing Income - (Schedule of Additional Details of Company's FDIC Loss Sharing Income) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Banking and Thrift [Abstract]
Clawback liability amortization	$ (384)	$ (345)	$ (1,131)	$ (1,009)
Clawback liability remeasurement	(132)	(592)	(1,242)	(1,646)
Reimbursement to FDIC for gain on sale of and income from covered OREO	(142)	(1,587)	(1,128)	(3,287)
Reimbursement to FDIC for recoveries	(10)	(62)	(28)	(180)
FDIC reimbursement of covered asset resolution costs	665	1,643	3,854	3,573
Total	$ (3)	$ (943)	$ 325	$ (2,549)

Stock-based Compensation and 77

Stock-based Compensation and Employee Benefits - (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	5,189,159		5,189,159
Grants After Plan Effective Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Award Other Than An Option or Stock Appreciation Right Granted			3.25
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Option or Stock Appreciation Right Granted			1
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 0.2	$ 0.3	$ 0.5	$ 1
Unrecognized compensation expense	0.8		$ 0.8
Unrecognized compensation cost, weighted-average period, years			2 years 1 month 6 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	0.8	$ 0.8	$ 2	$ 1.8
Unrecognized compensation expense	$ 3.1		$ 3.1
Unrecognized compensation cost, weighted-average period, years			2 years 3 months 18 days

Stock-based Compensation and 78

Stock-based Compensation and Employee Benefits - (Summary of Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	3,597,111
Granted, Options	147,042
Forfeited, Options	(24,422)
Surrendered, Options	(137,592)
Exercised, Options	(12,775)
Expired, Options	(508,700)
Outstanding Options, ending	3,060,664	3,597,111
Options fully vested and exercisable at September 30, 2015, Options	2,715,344
Options expected to vest, Options	335,295
Outstanding, Weighted Average Exercise Price, beginning	$ 19.90
Granted, Weighted Average Exercise Price	19.14
Forfeited, Weighted Average Exercise Price	18.63
Surrendered, Weighted Average Exercise Price	19.87
Exercised, Weighted Average Exercise Price	19.93
Expired, Weighted Average Exercise Price	20
Outstanding, Weighted Average Exercised Price, ending	19.86	$ 19.90
Options fully vested and exercisable at September 30, 2015, Weighted Average Exercise Price	19.98
Options expected to vest, Weighted Average Exercise Price	$ 18.99
Outstanding, Weighted Average Remaining Contractual Term in Years	4 years 9 months 29 days	4 years 5 months 16 days
Options fully vested and exercisable at September 30, 2015, weighted average remaining contractual term in years	4 years 4 months 2 days
Options expected to vest, Weighted Average Remaining Contractual Term in Years	8 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value, beginning	$ 223,211
Outstanding, Aggregate Intrinsic Value, ending	2,046,799	$ 223,211
Options expected to vest, Aggregate Intrinsic Value	$ 1,938,476

Stock-based Compensation and 79

Stock-based Compensation and Employee Benefits - (Summary of Restricted Stock Activity) (Details)	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested Restricted Shares, Beginning (in shares)	955,398
Unvested Restricted Shares, Vested (in shares)	(52,327)
Unvested Restricted Shares, Granted (in shares)	175,797
Unvested Restricted Shares, Forfeited (in shares)	(12,371)
Unvested Restricted Shares, Surrendered (in shares)	(19,517)
Unvested Restricted Shares, Ending (in shares)	1,046,980
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant-Date Fair Value, Beginning (in dollars per share) | $ / shares	$ 14.61
Weighted Average Grant-Date Fair Value, Vested (in dollars per share) | $ / shares	18.85
Weighted Average Grant-Date Fair Value, Granted (in dollars per share) | $ / shares	19.17
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share) | $ / shares	18.68
Weighted Average Grant-Date, Fair Value, Surrendered (in dollars per share) | $ / shares	18.84
Weighted Average Grant-Date Fair Value, Ending (in dollars per share) | $ / shares	$ 15.54

Warrants (Narrative) (Detail)

Warrants (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Summary Activity In Gold Bullion [Line Items]
Outstanding warrants	725,750	830,750	725,750	830,750	830,750
Warrants granted, exercise price per share	$ 20	$ 20	$ 20	$ 20	$ 20
Warrant, contractual term (in years)			10 years
Fair value of the warrants	$ 2,600		$ 2,600		$ 3,300
Warrants cancelled	105,000
Gain from the change in fair value of warrant liability	$ (476)	$ (1,256)	$ (358)	$ (2,734)
Minimum [Member]
Summary Activity In Gold Bullion [Line Items]
Expiration dates of the warrants range			Oct. 20, 2019
Maximum [Member]
Summary Activity In Gold Bullion [Line Items]
Expiration dates of the warrants range			Mar. 23, 2020

Warrants (Schedule of Fair Valu

Warrants (Schedule of Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model) (Detail) - Warrant [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Warrant Fair Value Black Scholes Method [Line Items]
Risk-free interest rate	1.22%	1.67%
Expected volatility	20.19%	24.18%
Dividend yield	0.97%	1.03%
Minimum [Member]
Warrant Fair Value Black Scholes Method [Line Items]
Expected term (years)	4 years	5 years
Maximum [Member]
Warrant Fair Value Black Scholes Method [Line Items]
Expected term (years)	5 years	6 years

Common Stock - (Narrative) (Det

Common Stock - (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	Aug. 10, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Feb. 11, 2015
Schedule Of Common Stock [Line Items]
Repurchase of shares			$ 175,048	$ 100,084
Shares outstanding		30,318,684	30,318,684		38,884,953
Restricted issued but not yet vested, shares			1,046,980		955,398
Common Class A [Member]
Schedule Of Common Stock [Line Items]
Shares outstanding		30,318,684	30,318,684		38,017,179
Common Class B [Member]
Schedule Of Common Stock [Line Items]
Shares outstanding		0	0		867,774
Board Authorized Share Repurchase Programs [Member]
Schedule Of Common Stock [Line Items]
Stock repurchase program, authorized amount					$ 50,000	$ 50,000
Shares repurchased (shares)	4,651,163	4,751,163	8,645,836
Repurchase of shares	$ 100,000	$ 102,000	$ 174,300
Shares repurchased (weighted average cost per share)	$ 21.50	$ 21.47	$ 20.16

Income Per Share - (Narrative)

Income Per Share - (Narrative) (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Shares outstanding	30,318,684	39,862,824
Outstanding stock options to purchase common stock	3,060,664	3,613,191	3,597,111
Outstanding stock options to purchase common stock, per share	$ 19.86	$ 19.89	$ 19.90
Outstanding warrants	725,750	830,750	830,750
Warrants granted, exercise price per share	$ 20	$ 20	$ 20
Restricted shares outstanding	1,046,980	1,149,505

Income Per Share - (Schedule of

Income Per Share - (Schedule of Computation of Basic and Diluted Income Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 1,636	$ 3,337	$ 1,541	$ 6,897
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(14)	(12)	(39)	(28)
Income available to common stockholders (numerator)	$ 1,622	$ 3,325	$ 1,502	$ 6,869
Weighted average common shares outstanding (denominator)	32,681,181	41,837,485	35,605,180	43,403,791
Weighted average shares outstanding for diluted earnings per common share	32,762,516	41,841,685	35,605,701	43,423,273
Income per share—basic (in dollars per share)	$ 0.05	$ 0.08	$ 0.04	$ 0.16
Income per share—diluted (in dollars per share)	$ 0.05	$ 0.08	$ 0.04	$ 0.16
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities	54,969	4,200	521	19,482
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities	26,366

Derivatives - (FV of Derivative

Derivatives - (FV of Derivatives on the Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	$ 6		$ 10
Liability Derivatives	8,865	$ 3,206
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	2,798		1,418
Liability Derivatives	2,977	1,522
Other assets [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	6		10
Other assets [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	2,798		$ 1,418
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability Derivatives	8,865	3,206
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability Derivatives	$ 2,977	$ 1,522

Derivatives - (Narrative) (Deta

Derivatives - (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)item	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)item	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)item
Derivative [Line Items]
Gain (loss) related to hedge ineffectiveness	$ 522	$ 46	$ 255	$ 186
Termination value of derivatives in net liability position	13,500		13,500		$ 1,900
Collateral Already Posted, Aggregate Fair Value	$ 14,400		$ 14,400		$ 5,500
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swaps held | item	19		19		11
Notional amount	$ 67,600		$ 67,600		$ 35,900
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swaps held | item	27		27		11
Notional amount	$ 246,900		$ 246,900		$ 68,800

Derivatives - (Derivatives on t

Derivatives - (Derivatives on the Income Statement) (Details) - Interest rate products [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Hedged Item	$ 8,246	$ (10)	$ 5,408	$ 1,185
Designated as Hedging Instrument [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Hedged Item	8,246	(10)	5,408	1,185
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(8,768)	(36)	(5,663)	(1,371)
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(8,768)	(36)	(5,663)	(1,371)
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(99)	(1)	(73)	(51)
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Interest expense [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (99)	$ (1)	$ (73)	$ (51)

Commitments and Contingencies88

Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Loan commitments	$ 499.7	$ 485.5
Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Standby letters of credit	$ 8.5	$ 10

Commitments and Contingencies89

Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	$ 4,717	$ 7,890
Unfunded commitment not covered under the FDIC loss sharing agreement	503,456	487,567
Total Unfunded Loan Commitments	508,173	495,457
Credit Card Lines of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment not covered under the FDIC loss sharing agreement	17,536	18,065
Total Unfunded Loan Commitments	17,536	18,065
Unfunded Commitments Under Lines of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	4,648	7,645
Unfunded commitment not covered under the FDIC loss sharing agreement	231,167	215,305
Total Unfunded Loan Commitments	235,815	222,950
Commercial and Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	69	234
Unfunded commitment not covered under the FDIC loss sharing agreement	8,401	9,731
Standby letters of credit	8,470	9,965
Commitments to Fund Loans [Member] | Residential [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment not covered under the FDIC loss sharing agreement	6,236	1,683
Total Unfunded Loan Commitments	6,236	1,683
Commitments to Fund Loans [Member] | Commercial and Commercial Real Estate [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement		11
Unfunded commitment not covered under the FDIC loss sharing agreement	195,779	202,593
Total Unfunded Loan Commitments	195,779	202,604
Commitments to Fund Loans [Member] | Construction and Land Development [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment not covered under the FDIC loss sharing agreement	40,131	35,814
Total Unfunded Loan Commitments	40,131	35,814
Commitments to Fund Loans [Member] | Consumer [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment not covered under the FDIC loss sharing agreement	4,206	4,376
Total Unfunded Loan Commitments	$ 4,206	$ 4,376

Fair Value Measurements - (Ta90

Fair Value Measurements - (Tables of Financial Instruments 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]
Total assets at fair value	$ 1,247,071	$ 1,480,642
Total liabilities at fair value	53,156	44,394
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,538	419
Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,804	1,428
Total liabilities at fair value	11,842	4,728
Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	2,602	3,328
Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	38,712	36,338
Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	336,372	404,215
Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	905,357	1,074,580
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,244,533	1,480,223
Total liabilities at fair value	11,842	4,728
Level 2 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,804	1,428
Total liabilities at fair value	11,842	4,728
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	336,372	404,215
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	905,357	1,074,580
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,538	419
Total liabilities at fair value	41,314	39,666
Level 3 [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,538	419
Level 3 [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	2,602	3,328
Level 3 [Member] | Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	$ 38,712	$ 36,338

Fair Value Measurements - (Ta91

Fair Value Measurements - (Table of Changes in Level 3 Financial Instruments) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 419	$ 419
Change in value	58
Purchases	2,061
Net change in level 3	2,119
Ending Balance	2,538	419
Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,328	6,281
Change in value	(726)	(2,734)
Net change in level 3	(726)	(2,734)
Ending Balance	2,602	3,547
Clawback Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	36,338	32,465
Change in value	1,242	1,646
Amortization	1,132	1,009
Net change in level 3	2,374	2,655
Ending Balance	$ 38,712	$ 35,120

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Loans Reserves	$ 3,200
Additions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Loans Reserves	3,000
Nonrecurring Loans Carrying value	14,500
Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Loans Reserves	100
FDIC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate Owned Impairments Covered by the FDIC	$ 500	$ 1,100
Percentage of OREO impairments covered by the FDIC	65.70%	60.20%
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses from change in fair value	$ 799	$ 1,789
Fair value of assets on a non-recurring basis	19,034	45,885
Impaired loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses from change in fair value	433	145
Fair value of assets on a non-recurring basis	50,506	$ 47,225
Premise and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses from change in fair value	1,089
Fair value of assets on a non-recurring basis	$ 813

Fair Value Measurements - (Inpu

Fair Value Measurements - (Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on a non-recurring basis	$ 19,034	$ 45,885
Losses From Fair Value Changes	799	1,789
Impaired loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on a non-recurring basis	50,506	47,225
Losses From Fair Value Changes	433	$ 145
Premise and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on a non-recurring basis	813
Losses From Fair Value Changes	$ 1,089

Fair Value Measurements - (Ta94

Fair Value Measurements - (Table of Valuation Techniques and Unobservable Inputs Used in Valuation of Financial Instruments Falling Within Level 3 of Fair Value Hierarchy) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	$ 1,247,071	$ 1,480,642
Total liabilities at fair value	53,156	$ 44,394
Other Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	2,538
Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	50,506
Clawback Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	38,712
Warrant [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	$ 2,602
Discounted Cash Flows [Member] | Clawback Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	4.00%
Minimum [Member] | Contractually Defined [Member] | Clawback Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intrinsic loss estimates	$ 323,300
Minimum [Member] | Discounted Cash Flows [Member] | Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	0.00%
Minimum [Member] | Black-Scholes [Member] | Warrant [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Volatility	21.00%
Maximum [Member] | Contractually Defined [Member] | Clawback Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intrinsic loss estimates	$ 405,000
Maximum [Member] | Discounted Cash Flows [Member] | Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	25.00%
Maximum [Member] | Black-Scholes [Member] | Warrant [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Volatility	28.00%

Fair Value of Financial Instr95

Fair Value of Financial Instruments - (Schedule of Fair Value of Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
ASSETS:
Cash and cash equivalents	$ 153,156	$ 256,979	$ 118,659	$ 189,460
Securities purchased under agreements to resell	50,000
Investment securities available-for-sale (at fair value)	1,244,267	1,479,214
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	445,069	530,590
Loans held-for-sale	11,246	5,146
LIABILITIES:
Time deposits	1,255,973	1,357,051
Securities sold under agreements to repurchase	169,488	133,552
Federal Home Loan Banks advances	40,000	40,000
Due to FDIC	38,712	42,011
Warrant liability	2,600	3,300
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	336,372	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	353,026	422,622
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	905,357	1,074,580
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	92,043	107,968
Other Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	2,538	419
Carrying Amount [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	153,156	256,979
Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Securities purchased under agreements to resell	50,000
Capital stock of FHLB	7,361	7,595
Capital stock of FRB	19,689	19,450
Loans held-for-sale	11,246	5,146
Accrued interest receivable	13,524	11,465
Derivative asset	2,804	1,428
LIABILITIES:
Deposit transaction accounts	2,618,664	2,409,137
Time deposits	1,255,973	1,357,051
Securities sold under agreements to repurchase	169,488	133,552
Federal Home Loan Banks advances	40,000	40,000
Accrued interest payable	4,594	3,608
Derivative liability	11,842	4,728
Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	2,523,128	2,144,796
LIABILITIES:
Due to FDIC	38,712	42,011
Warrant liability	2,602	3,328
Carrying Amount [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	336,372	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	353,026	422,622
Carrying Amount [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	905,357	1,074,580
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	92,043	107,968
Carrying Amount [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	2,538	419
Estimated Fair Value [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	153,156	256,979
Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Securities purchased under agreements to resell	50,018
Capital stock of FHLB	7,361	7,595
Capital stock of FRB	19,689	19,450
Loans held-for-sale	11,246	5,146
Accrued interest receivable	13,524	11,465
Derivative asset	2,804	1,428
LIABILITIES:
Deposit transaction accounts	2,618,664	2,409,137
Time deposits	1,255,973	1,357,885
Securities sold under agreements to repurchase	169,488	133,552
Federal Home Loan Banks advances	40,937	40,465
Accrued interest payable	4,594	3,608
Derivative liability	11,842	4,728
Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	2,573,651	2,193,222
LIABILITIES:
Due to FDIC	38,712	42,011
Warrant liability	2,602	3,328
Estimated Fair Value [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	336,372	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	358,812	428,323
Estimated Fair Value [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	905,357	1,074,580
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	91,336	106,314
Estimated Fair Value [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	$ 2,538	$ 419

Fair Value of Financial Instr96

Fair Value of Financial Instruments - (Additional Information) (Detail)	9 Months Ended
	Sep. 30, 2015
Fair Value Of Financial Instruments [Abstract]
Residential mortgage loans held for sale period	45 days

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 05, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
FDIC indemnification asset		$ 18,155	$ 39,082	$ 44,413	$ 64,447
FDIC clawback payable		$ 38,712	$ 42,011
Contract Termination [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payment for early termination agreement with the FDIC	$ 15,100
One-time after-tax gain	$ 2,600
One-time after-tax gain (in dollars per share)	$ 0.09