National Bank (NBHC) 10-Q 7 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Aug. 06, 2015
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
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 Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		35,055,362

Consolidated Statements of Fina

Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 57,880	$ 61,461
Due from banks	174,481	185,463
Interest bearing bank deposits	10,080	10,055
Cash and cash equivalents	242,441	256,979
Securities Purchased under Agreements to Resell	50,000	0
Investment securities available-for-sale (at fair value)	1,316,829	1,479,214
Investment securities held-to-maturity (fair value of $476,519 and $534,637 at June 30, 2015 and December 31, 2014, respectively)	472,605	530,590
Non-marketable securities	27,050	27,045
Loans (including covered loans of $167,149 and $193,697 at June 30, 2015 and December 31, 2014, respectively)	2,328,524	2,162,409
Allowance for loan losses	(20,241)	(17,613)
Loans, net	2,308,283	2,144,796
Loans held for sale	10,037	5,146
Federal Deposit Insurance Corporation (“FDIC”) indemnification asset, net	23,215	39,082
Other real estate owned	20,367	29,120
Premises and equipment, net	102,228	106,341
Goodwill	59,630	59,630
Intangible assets, net	14,210	16,883
Other assets	130,955	124,820
Total assets	4,777,850	4,819,646
Liabilities:
Non-interest bearing demand deposits	777,727	732,580
Interest bearing demand deposits	389,270	386,121
Savings and money market	1,327,953	1,290,436
Time deposits	1,267,539	1,357,051
Total deposits	3,762,489	3,766,188
Securities sold under agreements to repurchase	187,314	133,552
Advances from Federal Home Loan Banks	40,000	40,000
Due to FDIC	38,195	42,011
Other liabilities	31,586	43,320
Total liabilities	4,059,584	4,025,071
Shareholders’ equity:
Common stock, par value $0.01 per share: 400,000,000 shares authorized; 52,374,349 and 52,223,460 shares issued; 35,053,339 and 38,884,953 shares outstanding at June 30, 2015 and December 31, 2014, respectively	513	512
Additional paid in capital	994,454	993,212
Retained earnings	36,709	40,528
Treasury stock of 16,277,782 and 12,383,109 shares at June 30, 2015 and December 31, 2014, respectively, at cost	(317,854)	(245,516)
Accumulated other comprehensive income, net of tax	4,444	5,839
Total shareholders’ equity	718,266	794,575
Total liabilities and shareholders’ equity	$ 4,777,850	$ 4,819,646

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 476,519	$ 534,637
Loans receivable, net - covered	$ 167,149	$ 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	52,374,349	52,223,460
Common Stock, shares outstanding	35,053,339	38,884,953
Treasury stock, shares	16,277,782	12,383,109

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest and dividend income:
Interest and fees on loans	$ 32,166	$ 33,054	$ 64,147	$ 66,301
Interest and dividends on investment securities	9,764	12,606	20,336	25,774
Dividends on non-marketable securities	317	270	644	659
Interest on interest-bearing bank deposits	270	75	477	156
Total interest and dividend income	42,517	46,005	85,604	92,890
Interest expense:
Interest on deposits	3,451	3,556	6,850	7,062
Interest on borrowings	211	26	420	58
Total interest expense	3,662	3,582	7,270	7,120
Net interest income before provision for loan losses	38,855	42,423	78,334	85,770
Provision for loan losses	1,858	1,660	3,311	3,429
Net interest income after provision for loan losses	36,997	40,763	75,023	82,341
Non-interest income:
FDIC indemnification asset amortization	(7,283)	(5,959)	(14,953)	(13,567)
FDIC loss sharing income (expense)	1,138	(649)	328	(1,606)
Service charges	3,697	3,870	7,024	7,410
Bank card fees	2,699	2,559	5,249	4,933
Gain on sales of mortgages, net	546	202	946	410
Bank Owned Life Insurance Income	402	0	796	0
Other non-interest income	1,321	896	2,093	1,721
Gain on previously charged-off acquired loans	39	232	97	528
Other real estate owned related write-ups and other income	188	1,010	688	1,978
Total non-interest income	2,747	2,161	2,268	1,807
Non-interest expense:
Salaries and benefits	21,156	20,428	41,233	41,202
Occupancy and equipment	6,069	6,209	12,158	12,683
Telecommunications and data processing	2,578	2,982	5,640	6,130
Marketing and business development	1,252	1,762	2,261	2,785
FDIC deposit insurance	1,032	1,035	2,073	2,080
ATM/debit card expenses	789	762	1,546	1,513
Professional fees	962	688	2,082	1,326
Other non-interest expense	2,493	2,749	4,735	5,158
Gain (loss) from the change in fair value of warrant liability	508	(580)	118	(1,478)
Restructuring Charges	1,089	0	1,089	0
Intangible asset amortization	1,336	1,336	2,672	2,672
Other real estate owned (income) expenses	406	1,402	(12)	3,035
Problem loan expenses	723	1,082	1,522	1,767
Total non-interest expense	40,393	39,855	77,117	78,873
(Loss) income before income taxes	(649)	3,069	174	5,275
Income tax expense	692	940	269	1,715
Net (loss) income	$ (1,341)	$ 2,129	$ (95)	$ 3,560
Income per share—basic (in dollars per share)	$ (0.04)	$ 0.05	$ 0	$ 0.08
Income per share—diluted (in dollars per share)	$ (0.04)	$ 0.05	$ 0	$ 0.08
Weighted average number of common shares outstanding:
Basic (Shares)	36,164,617	43,868,164	37,091,412	44,341,276
Diluted (Shares)	36,164,617	43,880,263	37,091,412	44,364,639

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ (1,341)	$ 2,129	$ (95)	$ 3,560
Other comprehensive (loss) income, net of tax:
Net unrealized (losses) gains arising during the period, net of tax benefit (expense) of $4,299 and $(3,343) for the three months ended June 30, 2015 and 2014, respectively; and net of tax expense of $0 and $8,305 for the six months ended June 30, 2015 and 2014, respectively.	(6,989)	5,436	0	13,505
Net unrealized holding gains on securities transferred between available-for-sale to held-to-maturity:
Amortization of net unrealized holding gains on securities transferred between available-for-sale to held-to-maturity, net of tax benefit of $401 and $509 for the three months ended June 30, 2015 and 2014, respectively; and net of tax benefit of $857 and $1,029 for the six months ended June 30, 2015 and 2014, respectively.	(652)	(829)	(1,395)	(1,673)
Other comprehensive (loss) income	(7,641)	4,607	(1,395)	11,832
Comprehensive (loss) income	$ (8,982)	$ 6,736	$ (1,490)	$ 15,392

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Tax expense on net unrealized gains arising during the period	$ (4,299)	$ 3,343	$ 0	$ 8,305
Tax benefit of amortization of net unrealized holding gains to income	$ 401	$ 509	$ 857	$ 1,029

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income, net [Member]
Balance in the beginning at Dec. 31, 2013	$ 897,792	$ 512	$ 990,216	$ 39,966	$ (126,146)	$ (6,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,560	0	0	3,560	0	0
Stock-based compensation	1,603	0	1,603	0	0	0
Issuance under equity compensation plan	(379)	0	(379)	0	0	0
Change in corporate tax benefit related to stock-based compensation	(4)
Repurchase of shares	(45,968)	0	0	0	(45,968)	0
Dividends paid ($0.10 per share)	(4,507)	0	0	(4,507)	0	0
Other comprehensive loss	11,832	0	0	0	0	11,832
Balance in the ending at Jun. 30, 2014	863,933	512	991,440	39,019	(172,114)	5,076
Balance in the beginning at Dec. 31, 2014	794,575	512	993,212	40,528	(245,516)	5,839
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(95)	0	0	(95)	0	0
Stock-based compensation	1,510	0	1,510	0	0	0
Issuance under equity compensation plan	(267)	1	(268)	0	0	0
Change in corporate tax benefit related to stock-based compensation	(8)
Repurchase of shares	(72,338)	0	0	0	(72,338)	0
Dividends paid ($0.10 per share)	(3,724)	0	0	(3,724)	0	0
Other comprehensive loss	(1,395)	0	0	0	0	(1,395)
Balance in the ending at Jun. 30, 2015	$ 718,266	$ 513	$ 994,454	$ 36,709	$ (317,854)	$ 4,444

Consolidated Statements of Cha8

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Dividends paid per share	$ 0.10	$ 0.10
Common Stock Purchased	3,894,673	2,310,595
Treasury Stock, Shares, Retired	0	0
Excess tax benefit of stock-based compensation	$ 8	$ 4

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
Proceeds from (Payments for) Securities Purchased under Agreements to Resell	$ (50,000)	$ 0
Cash flows from operating activities:
Net income	(95)	3,560
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Provision for loan losses	3,311	3,429
Depreciation and amortization	7,754	8,368
Current income tax receivable	112	13,510
Deferred income tax asset	(3,111)	(11,230)
Discount accretion, net of premium amortization on securities	2,163	2,534
Loan accretion	(26,360)	(34,020)
Net gains on sales of mortgage loans	(946)	(410)
Originations of loans held for sale, net of repayments	(48,137)	(17,179)
Proceeds from sales of loans held for sale	44,192	18,616
Bank Owned Life Insurance Income	(796)	0
Amortization of indemnification asset	14,953	13,567
Gains on the sales of other real estate owned, net	(2,103)	(1,028)
Impairment on other real estate owned	757	880
Gain on sale of fixed assets	6	(123)
Other Restructuring Costs	1,089	0
Stock-based compensation expense	1,510	1,603
Decrease in due to FDIC, net	(3,816)	(7,699)
Increase in other assets	(1,504)	(469)
(Decrease) increase in other liabilities	(11,801)	3,636
Net cash used in operating activities	(22,822)	(2,455)
Cash flows from investing activities:
Proceeds from redemptions of FHLB stock	234	619
Proceeds from Sale of Federal Reserve Bank Stock	(239)	9,390
Maturities of investment securities held-to-maturity	55,411	50,561
Maturities of investment securities available-for-sale	160,542	157,870
Net increase in loans	(153,060)	(202,059)
Purchases of premises and equipment, net	(2,063)	(347)
Proceeds from sales of loans	11,702	1,103
Proceeds from sales of other real estate owned	11,019	16,307
Increase (decrease) in FDIC indemnification asset	914	(529)
Net cash provided by investing activities	34,460	32,915
Cash flows from financing activities:
Net (decrease) increase in deposits	(3,699)	18,024
Increase (decrease) in repurchase agreements	53,762	(14,115)
Issuance under equity compensation plan	(420)	(383)
Proceeds from exercise of stock options	160	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	8	4
Payment of dividends	(3,649)	(4,423)
Repurchases of shares	(72,338)	(45,968)
Net cash used in financing activities	(26,176)	(46,861)
Decrease in cash and cash equivalents	(14,538)	(16,401)
Cash and cash equivalents at beginning of the year	256,979	189,460
Cash and cash equivalents at end of period	242,441	173,059
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	7,228	6,754
Net tax payments (refunds)	3,194	(542)
Supplemental schedule of non-cash investing activities:
Loans transferred to other real estate owned at fair value	920	1,477
FDIC indemnification asset claims transferred to other liabilities	(2,495)	(987)
Loans purchased but not settled	$ 0	$ 16,019

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	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 those 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 six months ended June 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 six months ended June 30, 2015 was 106.6% and 154.6% , 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 our pre-tax income (loss). Furthermore, we recorded $1.7 million tax expense related to the write-off of deferred tax assets on certain stock-based compensation awards granted to former executives which expired in the quarter. We are currently in an open IRS examination for the tax year 2012.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2015
Text Block [Abstract]
Recent Accounting Pronouncements	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.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $1.8 billion at June 30, 2015 and were comprised of $1.3 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: June 30, 2015 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 349,760 $ 8,279 $ (206 ) $ 357,833 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 971,933 6,471 (19,827 ) 958,577 Other securities 419 — — 419 Total $ 1,322,112 $ 14,750 $ (20,033 ) $ 1,316,829 December 31, 2014 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 395,244 $ 9,014 $ (43 ) $ 404,215 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 1,088,834 7,464 (21,718 ) 1,074,580 Other securities 419 — — 419 Total $ 1,484,497 $ 16,478 $ (21,761 ) $ 1,479,214 At June 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: June 30, 2015 Less than 12 months 12 months or more Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 90,176 $ (206 ) $ — $ — $ 90,176 $ (206 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 86,125 (1,912 ) 577,337 (17,915 ) 663,462 (19,827 ) Total $ 176,301 $ (2,118 ) $ 577,337 $ (17,915 ) $ 753,638 $ (20,033 ) December 31, 2014 Less than 12 months 12 months or more Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 17 $ — $ 89,749 $ (43 ) $ 89,766 $ (43 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 88,854 (2,053 ) 667,368 (19,665 ) 756,222 (21,718 ) Total $ 88,871 $ (2,053 ) $ 757,117 $ (19,708 ) $ 845,988 $ (21,761 ) Management evaluated all of the available-for-sale securities in an unrealized loss position and concluded that no other-than-temporary impairment existed at June 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 June 30, 2015 were caused by changes in interest rates. The portfolio included 57 securities, having an aggregate fair value of $0.8 billion , which were in an unrealized loss position at June 30, 2015 , compared to 62 securities, with a fair value of $0.8 billion , at December 31, 2014 . The Company had 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. 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 $344.8 million at June 30, 2015 and $274.4 million 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 six months ended June 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 June 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 3.7 years as of June 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 $0.4 million have no stated contractual maturity date as of June 30, 2015 . Held-to-maturity At June 30, 2015 and December 31, 2014 , the Company held $472.6 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: June 30, 2015 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 374,915 $ 5,287 $ (148 ) $ 380,054 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 97,690 346 (1,571 ) 96,465 Total investment securities held-to-maturity $ 472,605 $ 5,633 $ (1,719 ) $ 476,519 December 31, 2014 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 422,622 $ 5,773 $ (72 ) $ 428,323 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 107,968 217 (1,871 ) 106,314 Total investment securities held-to-maturity $ 530,590 $ 5,990 $ (1,943 ) $ 534,637 The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: June 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 30,744 $ (112 ) $ 1,902 $ (36 ) $ 32,646 $ (148 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 18,762 (55 ) 50,233 (1,516 ) 68,995 (1,571 ) Total $ 49,506 $ (167 ) $ 52,135 $ (1,552 ) $ 101,641 $ (1,719 ) December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ 35,139 $ (72 ) $ 35,139 $ (72 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — 75,139 (1,871 ) 75,139 (1,871 ) Total $ — $ — $ 110,278 $ (1,943 ) $ 110,278 $ (1,943 ) The portfolio included 13 securities, having an aggregate fair value of $0.1 billion , which were in an unrealized loss position at June 30, 2015 , compared to 12 securities, with a fair value of $0.1 billion , 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 June 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 June 30, 2015 were caused by changes in interest rates. The Company had 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 $92.2 million and $88.3 million at June 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 June 30, 2015 and December 31, 2014 was 3.7 years and 3.4 years, respectively. This estimate is based on assumptions and actual results may differ.

Loans

Loans	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Loans	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, and Hillcrest Bank and Bank Midwest in 2010. 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, and covered loans are presented separately from non-covered loans due to the FDIC loss sharing agreements associated with these loans. Covered loans comprised 7.2% of the total loan portfolio at June 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 June 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 $8.3 million and $10.5 million as of June 30, 2015 and December 31, 2014 , respectively: June 30, 2015 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ 21,417 $ 895,309 $ 916,726 39.4 % Agriculture 18,486 122,468 140,954 6.1 % Commercial real estate 166,481 416,885 583,366 25.0 % Residential real estate 31,162 623,167 654,329 28.1 % Consumer 3,749 29,400 33,149 1.4 % Total $ 241,295 $ 2,087,229 $ 2,328,524 100.0 % Covered $ 139,250 $ 27,899 $ 167,149 7.2 % Non-covered 102,045 2,059,330 2,161,375 92.8 % Total $ 241,295 $ 2,087,229 $ 2,328,524 100.0 % December 31, 2014 ASC 310-30 loans Non 310-30 Total loans % of total Commercial $ 22,956 $ 772,440 $ 795,396 36.8 % Agriculture 19,063 118,468 137,531 6.4 % Commercial real estate 192,330 369,264 561,594 26.0 % Residential real estate 40,761 591,939 632,700 29.2 % Consumer 4,535 30,653 35,188 1.6 % Total $ 279,645 $ 1,882,764 $ 2,162,409 100.0 % Covered $ 160,876 $ 32,821 $ 193,697 9.0 % Non-covered 118,769 1,849,943 1,968,712 91.0 % Total $ 279,645 $ 1,882,764 $ 2,162,409 100.0 % Included in commercial loans are $144.2 million and $161.8 million of energy-related loans at June 30, 2015 and December 31, 2014 , respectively. Energy prices declined significantly during 2014 and 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 $256.4 million and $112.6 million at June 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 $15.1 million and $10.8 million at June 30, 2015 and December 31, 2014 , respectively. Loan delinquency for all loans is shown in the following tables at June 30, 2015 and December 31, 2014 , respectively: Total Loans June 30, 2015 30-59 days past due 60-89 days past due Greater than 90 days past due Total past due Current Total loans Loans > 90 days past due and still accruing Non- accrual Loans excluded from ASC 310-30 Commercial $ 5,998 $ 134 $ 1,089 $ 7,221 $ 888,088 $ 895,309 $ 22 $ 10,311 Agriculture 135 — — 135 122,333 122,468 — 265 Commercial real estate Construction — — — — 10,772 10,772 — — Acquisition/development — — — — 4,001 4,001 — — Multifamily — — — — 17,120 17,120 — — Owner-occupied — — 113 113 146,396 146,509 — 726 Non owner-occupied 1,383 208 — 1,591 236,892 238,483 — 49 Total commercial real estate 1,383 208 113 1,704 415,181 416,885 — 775 Residential real estate Senior lien 653 — 1,250 1,903 568,038 569,941 — 3,313 Junior lien 160 8 — 168 53,058 53,226 — 382 Total residential real estate 813 8 1,250 2,071 621,096 623,167 — 3,695 Consumer 240 4 — 244 29,156 29,400 — 31 Total loans excluded from ASC 310-30 $ 8,569 $ 354 $ 2,452 $ 11,375 $ 2,075,854 $ 2,087,229 $ 22 $ 15,077 Covered loans excluded from ASC 310-30 $ 3 $ — $ 1,052 $ 1,055 $ 26,844 $ 27,899 $ — $ 1,140 Non-covered loans excluded from ASC 310-30 8,566 354 1,400 10,320 2,049,010 2,059,330 22 13,937 Total loans excluded from ASC 310-30 $ 8,569 $ 354 $ 2,452 $ 11,375 $ 2,075,854 $ 2,087,229 $ 22 $ 15,077 Loans accounted for under ASC 310-30 Commercial $ 418 $ 70 $ 742 $ 1,230 $ 20,187 $ 21,417 $ 742 $ — Agriculture 374 — 65 439 18,047 18,486 65 — Commercial real estate 884 145 21,736 22,765 143,716 166,481 21,736 — Residential real estate 147 — 2,290 2,437 28,725 31,162 2,290 — Consumer 165 — 21 186 3,563 3,749 21 — Total loans accounted for under ASC 310-30 $ 1,988 $ 215 $ 24,854 $ 27,057 $ 214,238 $ 241,295 $ 24,854 $ — Covered loans accounted for under ASC 310-30 $ 1,197 $ — $ 23,078 $ 24,275 $ 114,975 $ 139,250 $ 23,080 $ — Non-covered loans accounted for under ASC 310-30 791 215 1,776 2,782 99,263 102,045 1,774 — Total loans accounted for under ASC 310-30 $ 1,988 $ 215 $ 24,854 $ 27,057 $ 214,238 $ 241,295 $ 24,854 $ — Total loans $ 10,557 $ 569 $ 27,306 $ 38,432 $ 2,290,092 $ 2,328,524 $ 24,876 $ 15,077 Covered loans $ 1,200 $ — $ 24,130 $ 25,330 $ 141,819 $ 167,149 $ 23,080 $ 1,140 Non-covered loans 9,357 569 3,176 13,102 2,148,273 2,161,375 1,796 13,937 Total loans $ 10,557 $ 569 $ 27,306 $ 38,432 $ 2,290,092 $ 2,328,524 $ 24,876 $ 15,077 Total Loans December 31, 2014 30-59 days past due 60-89 days past due Greater than 90 days past due Total past due Current Total loans Loans > 90 days past due and still accruing Non- accrual Loans excluded from ASC 310-30 Commercial $ 83 $ 97 $ 318 $ 498 $ 771,942 $ 772,440 $ 215 $ 4,215 Agriculture 47 — 10 57 118,411 118,468 10 495 Commercial real estate Construction — — — — 11,748 11,748 — — Acquisition/development 41 — — 41 4,532 4,573 — — Multifamily — — — — 10,856 10,856 (1 ) — Owner-occupied 336 78 101 515 119,710 120,225 — 843 Non owner-occupied 158 — 222 380 221,482 221,862 — 222 Total commercial real estate 535 78 323 936 368,328 369,264 (1 ) 1,065 Residential real estate Senior lien 378 1,403 732 2,513 537,022 539,535 — 4,335 Junior lien 133 1 101 235 52,169 52,404 — 476 Total residential real estate 511 1,404 833 2,748 589,191 591,939 — 4,811 Consumer 266 21 39 326 30,327 30,653 39 227 Total loans excluded from ASC 310-30 $ 1,442 $ 1,600 $ 1,523 $ 4,565 $ 1,878,199 $ 1,882,764 $ 263 $ 10,813 Covered loans excluded from ASC 310-30 $ 17 $ 1,016 $ 152 $ 1,185 $ 31,636 $ 32,821 $ 75 $ 1,317 Non-covered loans excluded from ASC 310-30 1,425 584 1,371 3,380 1,846,563 1,849,943 188 9,496 Total loans excluded from ASC 310-30 $ 1,442 $ 1,600 $ 1,523 $ 4,565 $ 1,878,199 $ 1,882,764 $ 263 $ 10,813 Loans accounted for under ASC 310-30 Commercial $ 152 $ — $ 1,755 $ 1,907 $ 21,049 $ 22,956 $ 1,754 $ — Agriculture — — 367 367 18,696 19,063 367 — Commercial real estate 564 92 31,013 31,669 160,661 192,330 31,013 — Residential real estate 2,014 3,826 646 6,486 34,275 40,761 646 — Consumer 369 — 54 423 4,112 4,535 54 — Total loans accounted for under ASC 310-30 $ 3,099 $ 3,918 $ 33,835 $ 40,852 $ 238,793 $ 279,645 $ 33,834 $ — Covered loans accounted for under ASC 310-30 $ 576 $ 3,892 $ 31,239 $ 35,707 $ 125,169 $ 160,876 $ 31,238 $ — Non-covered loans accounted for under ASC 310-30 2,523 26 2,596 5,145 113,624 118,769 2,596 — Total loans accounted for under ASC 310-30 $ 3,099 $ 3,918 $ 33,835 $ 40,852 $ 238,793 $ 279,645 $ 33,834 $ — Total loans $ 4,541 $ 5,518 $ 35,358 $ 45,417 $ 2,116,992 $ 2,162,409 $ 34,097 $ 10,813 Covered loans $ 593 $ 4,908 $ 31,391 $ 36,892 $ 156,805 $ 193,697 $ 31,313 $ 1,317 Non-covered loans 3,948 610 3,967 8,525 1,960,187 1,968,712 2,784 9,496 Total loans $ 4,541 $ 5,518 $ 35,358 $ 45,417 $ 2,116,992 $ 2,162,409 $ 34,097 $ 10,813 The Company's commercial substandard loans excluded from ASC 310-30 totaled $45.2 million and $19.3 million at June 30, 2015 and December 31, 2014 , respectively. The increase was primarily due to four loan relationships totaling $28.0 million at June 30, 2015 . Three of these substandard loans were energy related and totaled $21.3 million at June 30, 2015 . Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows as of June 30, 2015 and December 31, 2014 , respectively: Total Loans June 30, 2015 Pass Special mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ 819,981 $ 29,415 $ 45,234 $ 679 $ 895,309 Agriculture 109,723 12,130 615 — 122,468 Commercial real estate Construction 10,772 — — — 10,772 Acquisition/development 4,001 — — — 4,001 Multifamily 17,120 — — — 17,120 Owner-occupied 142,378 149 3,982 — 146,509 Non owner-occupied 230,394 4,856 3,228 5 238,483 Total commercial real estate 404,665 5,005 7,210 5 416,885 Residential real estate Senior lien 564,946 — 4,826 169 569,941 Junior lien 52,061 — 1,165 — 53,226 Total residential real estate 617,007 — 5,991 169 623,167 Consumer 29,369 — 31 — 29,400 Total loans excluded from ASC 310-30 $ 1,980,745 $ 46,550 $ 59,081 $ 853 $ 2,087,229 Covered loans excluded from ASC 310-30 $ 16,594 $ 163 $ 10,994 $ 148 $ 27,899 Non-covered loans excluded from ASC 310-30 1,964,151 46,387 48,087 705 2,059,330 Total loans excluded from ASC 310-30 $ 1,980,745 $ 46,550 $ 59,081 $ 853 $ 2,087,229 Loans accounted for under ASC 310-30 Commercial $ 9,813 $ 446 $ 10,854 $ 304 $ 21,417 Agriculture 10,616 6,028 1,842 — 18,486 Commercial real estate 74,320 3,319 85,073 3,769 166,481 Residential real estate 23,198 1,211 6,753 — 31,162 Consumer 3,241 100 408 — 3,749 Total loans accounted for under ASC 310-30 $ 121,188 $ 11,104 $ 104,930 $ 4,073 $ 241,295 Covered loans accounted for under ASC 310-30 $ 39,446 $ 8,901 $ 86,830 $ 4,073 $ 139,250 Non-covered loans accounted for under ASC 310-30 81,742 2,203 18,100 — 102,045 Total loans accounted for under ASC 310-30 $ 121,188 $ 11,104 $ 104,930 $ 4,073 $ 241,295 Total loans $ 2,101,933 $ 57,654 $ 164,011 $ 4,926 $ 2,328,524 Total covered $ 56,040 $ 9,064 $ 97,824 $ 4,221 $ 167,149 Total non-covered 2,045,893 48,590 66,187 705 2,161,375 Total loans $ 2,101,933 $ 57,654 $ 164,011 $ 4,926 $ 2,328,524 Total Loans December 31, 2014 Pass Special mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ 742,944 $ 10,166 $ 19,250 $ 80 $ 772,440 Agriculture 114,642 85 3,741 — 118,468 Commercial real estate Construction 11,748 — — — 11,748 Acquisition/development 4,573 — — — 4,573 Multifamily 10,856 — — — 10,856 Owner-occupied 115,178 158 4,889 — 120,225 Non owner-occupied 199,817 17,607 4,430 8 221,862 Total commercial real estate 342,172 17,765 9,319 8 369,264 Residential real estate Senior lien 533,630 23 5,744 138 539,535 Junior lien 51,059 — 1,345 — 52,404 Total residential real estate 584,689 23 7,089 138 591,939 Consumer 30,426 — 227 — 30,653 Total loans excluded from ASC 310-30 $ 1,814,873 $ 28,039 $ 39,626 $ 226 $ 1,882,764 Covered loans excluded from ASC 310-30 $ 21,240 $ 171 $ 11,301 $ 109 $ 32,821 Non-covered loans excluded from ASC 310-30 1,793,633 27,868 28,325 117 1,849,943 Total loans excluded from ASC 310-30 $ 1,814,873 $ 28,039 $ 39,626 $ 226 $ 1,882,764 Loans accounted for under ASC 310-30 Commercial $ 11,038 $ 282 $ 11,092 $ 544 $ 22,956 Agriculture 16,854 30 2,179 — 19,063 Commercial real estate 82,603 3,770 101,966 3,991 192,330 Residential real estate 29,069 1,403 10,289 — 40,761 Consumer 3,641 105 789 — 4,535 Total loans accounted for under ASC 310-30 $ 143,205 $ 5,590 $ 126,315 $ 4,535 $ 279,645 Covered loans accounted for under ASC 310-30 $ 49,856 $ 3,036 $ 103,451 $ 4,533 $ 160,876 Non-covered loans accounted for under ASC 310-30 93,349 2,554 22,864 2 118,769 Total loans accounted for under ASC 310-30 $ 143,205 $ 5,590 $ 126,315 $ 4,535 $ 279,645 Total loans $ 1,958,078 $ 33,629 $ 165,941 $ 4,761 $ 2,162,409 Total covered $ 71,096 $ 3,207 $ 114,752 $ 4,642 $ 193,697 Total non-covered 1,886,982 30,422 51,189 119 1,968,712 Total loans $ 1,958,078 $ 33,629 $ 165,941 $ 4,761 $ 2,162,409 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 June 30, 2015 , the Company measured $10.7 million of impaired loans using discounted cash flows, the loan’s initial contractual effective interest rate and observable market valuations and $22.3 million of impaired loans based on the fair value of the collateral less selling costs. Impaired loans totaling $8.2 million , that individually were less than $250 thousand each, were measured through our general allowance reserves due to their relatively small size. At June 30, 2015 and December 31, 2014 , the Company’s recorded investments in impaired loans were $41.2 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 six months ended June 30, 2015 , was primarily due to two relationships totaling $12.7 million that were deemed impaired during the period. Both of the relationships were in the commercial and industrial segment and were non-covered, one of which totaled $6.8 million and was current as to principal and interest payments as of June 30, 2015 , and the other totaled $5.9 million and was on non-accrual status at June 30, 2015 . Impaired loans had a collective related allowance for loan losses allocated to them of $0.9 million and $0.3 million at June 30, 2015 and December 31, 2014 , respectively. Additional information regarding impaired loans at June 30, 2015 and December 31, 2014 is set forth in the table below: Impaired Loans June 30, 2015 December 31, 2014 Unpaid principal balance Recorded investment Allowance for loan losses allocated Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Commercial $ 28,570 $ 28,283 $ — $ 16,953 $ 16,771 $ — Agriculture — — — 3,065 3,061 — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied 2,145 1,876 — 1,164 970 — Non-owner occupied — — — — — — Total commercial real estate 2,145 1,876 — 1,164 970 — Residential real estate Senior lien 349 310 — 694 248 — Junior lien — — — — — — Total residential real estate 349 310 — 694 248 — Consumer — — — — — — Total impaired loans with no related allowance recorded $ 31,064 $ 30,469 $ — $ 21,876 $ 21,050 $ — With a related allowance recorded: Commercial $ 1,678 $ 1,502 $ 681 $ 894 $ 693 $ 82 Agriculture 390 362 2 177 145 — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily 39 38 — — — — Owner-occupied 1,238 918 2 1,321 1,024 5 Non-owner occupied 922 846 6 1,140 1,060 9 Total commercial real estate 2,199 1,802 8 2,461 2,084 14 Residential real estate Senior lien 6,372 5,760 193 7,360 6,359 172 Junior lien 1,560 1,300 9 1,768 1,515 9 Total residential real estate 7,932 7,060 202 9,128 7,874 181 Consumer 48 46 — 277 245 2 Total impaired loans with a related allowance recorded $ 12,247 $ 10,772 $ 893 $ 12,937 $ 11,041 $ 279 Total impaired loans $ 43,311 $ 41,241 $ 893 $ 34,813 $ 32,091 $ 279 The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For the six months ended June 30, 2015 June 30, 2014 Average recorded investment Interest income recognized Average recorded investment Interest income recognized With no related allowance recorded: Commercial $ 28,670 $ 357 $ 25,329 $ 150 Agriculture — — 9,028 108 Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — — — — Owner-occupied 1,910 35 1,603 47 Non owner-occupied — — 473 15 Total commercial real estate 1,910 35 2,076 62 Residential real estate Senior lien 315 9 405 5 Junior lien — — — — Total residential real estate 315 9 405 5 Consumer — — — — Total impaired loans with no related allowance recorded $ 30,895 $ 401 $ 36,838 $ 325 With a related allowance recorded: Commercial $ 1,549 $ 1 $ 1,793 $ 4 Agriculture 407 2 171 — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily 39 — 874 — Owner-occupied 960 13 811 7 Non owner-occupied 863 26 659 13 Total commercial real estate 1,862 39 2,344 20 Residential real estate Senior lien 5,880 59 7,344 52 Junior lien 1,326 26 1,540 30 Total residential real estate 7,206 85 8,884 82 Consumer 49 — 240 — Total impaired loans with a related allowance recorded $ 11,073 $ 127 $ 13,432 $ 106 Total impaired loans $ 41,968 $ 528 $ 50,270 $ 431 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 June 30, 2015 and December 31, 2014 , the Company had $15.2 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 June 30, 2015 and December 31, 2014 , respectively. Approximately $8.8 million of loans reported as TDRs at December 31, 2014 were in compliance with their modified terms at June 30, 2015 , and therefore, are no longer reportable as TDRs at June 30, 2015 . Non-accruing TDRs at June 30, 2015 and December 31, 2014 totaled $5.4 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 June 30, 2015 and December 31, 2014 , respectively. During the six months ended June 30, 2015 , the Company restructured twelve loans with a recorded investment of $8.0 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 June 30, 2015 and December 31, 2014 : Accruing TDRs June 30, 2015 Recorded investment Average year-to- date recorded investment Unpaid principal balance Unfunded commitments to fund TDRs Commercial $ 12,635 $ 12,870 $ 12,765 $ 1,887 Agriculture 97 99 101 — Commercial real estate 394 399 399 — Residential real estate 2,071 2,105 2,119 2 Consumer 15 16 15 — Total $ 15,212 $ 15,489 $ 15,399 $ 1,889 Accruing TDRs December 31, 2014 Recorded investment Average year-to- date recorded investment Unpaid principal balance Unfunded commitments to fund TDRs Commercial $ 13,249 $ 12,496 $ 13,249 $ 375 Agriculture 2,711 3,110 2,715 — Commercial real estate 610 627 622 — Residential real estate 2,687 2,767 2,714 2 Consumer 18 20 18 — Total $ 19,275 $ 19,020 $ 19,318 $ 377 The following table summarizes the Company’s carrying value of non-accrual TDRs as of June 30, 2015 and December 31, 2014 : Non - Accruing TDRs June 30, 2015 December 31, 2014 Covered Non-covered Covered Non-covered Commercial $ — $ 3,332 $ 1 $ 3,993 Agriculture 81 154 201 164 Commercial real estate 75 300 94 364 Residential real estate 875 567 910 1,056 Consumer — 2 — 190 Total $ 1,031 $ 4,355 $ 1,206 $ 5,767 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 six months ended June 30, 2015 . During the six months ended June 30, 2014 , the Company had four TDRs that had been modified within the past 12 months that defaulted on their restructured terms. The defaulted TDRs consisted of agriculture, residential real estate, and consumer loans totaling $59 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 six months ended June 30, 2015 and 2014 : June 30, June 30, Accretable yield beginning balance $ 113,463 $ 130,624 Reclassification from non-accretable difference 15,823 18,658 Reclassification to non-accretable difference (1,390 ) (909 ) Accretion (24,466 ) (32,278 ) Accretable yield ending balance $ 103,430 $ 116,095 Below is the composition of the net book value for loans accounted for under ASC 310-30 at June 30, 2015 and December 31, 2014 : June 30, December 31, Contractual cash flows $ 689,116 $ 751,932 Non-accretable difference (344,391 ) (358,824 ) Accretable yield (103,430 ) (113,463 ) Loans accounted for under ASC 310-30 $ 241,295 $ 279,645

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Allowance for Loan Losses	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 six months ended June 30, 2015 and 2014 : Three months ended June 30, 2015 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 9,920 $ 1,151 $ 3,665 $ 3,787 $ 350 $ 18,873 Non 310-30 beginning balance 9,900 551 3,528 3,787 336 18,102 Charge-offs (1 ) — (220 ) (95 ) (357 ) (673 ) Recoveries 26 7 109 — 55 197 Provision 99 135 287 955 374 1,850 Non 310-30 ending balance 10,024 693 3,704 4,647 408 19,476 ASC 310-30 beginning balance 20 600 137 — 14 771 Charge-offs — — — — (14 ) (14 ) Recoveries — — — — — — Provision (recoupment) — 12 (11 ) 2 5 8 ASC 310-30 ending balance 20 612 126 2 5 765 Ending balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Three months ended June 30, 2014 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 5,724 $ 1,213 $ 2,213 $ 4,234 $ 588 $ 13,972 Non 310-30 beginning balance 5,581 548 1,977 4,169 473 12,748 Charge-offs (26 ) — — (49 ) (184 ) (259 ) Recoveries 59 — 17 85 74 235 Provision 806 62 741 39 102 1,750 Non 310-30 ending balance 6,420 610 2,735 4,244 465 14,474 ASC 310-30 beginning balance 143 665 236 65 115 1,224 Charge-offs — — — — (36 ) (36 ) Recoveries — — — — — — Provision (recoupment) (142 ) 132 (2 ) 1 (79 ) (90 ) ASC 310-30 ending balance 1 797 234 66 — 1,098 Ending balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Six months ended June 30, 2015 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 8,598 $ 1,009 $ 3,819 $ 3,771 $ 416 $ 17,613 Non 310-30 beginning balance 8,598 541 3,597 3,743 413 16,892 Charge-offs (4 ) (47 ) (222 ) (177 ) (565 ) (1,015 ) Recoveries 47 7 124 30 138 346 Provision 1,383 192 205 1,051 422 3,253 Non 310-30 ending balance 10,024 693 3,704 4,647 408 19,476 ASC 310-30 beginning balance — 468 222 28 3 721 Charge-offs — — — — (14 ) (14 ) Recoveries — — — — — — Provision (recoupment) 20 144 (96 ) (26 ) 16 58 ASC 310-30 ending balance 20 612 126 2 5 765 Ending balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ 681 $ 2 $ 8 $ 202 $ — $ 893 Non 310-30 loans collectively evaluated for impairment 9,343 691 3,696 4,445 408 18,583 ASC 310-30 loans 20 612 126 2 5 765 Total ending allowance balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Loans: Non 310-30 individually evaluated for impairment $ 29,785 $ 362 $ 3,677 $ 7,371 $ 46 $ 41,241 Non 310-30 collectively evaluated for impairment 865,524 122,106 413,208 615,796 29,354 2,045,988 ASC 310-30 loans 21,417 18,486 166,481 31,162 3,749 241,295 Total loans $ 916,726 $ 140,954 $ 583,366 $ 654,329 $ 33,149 $ 2,328,524 Six months ended June 30, 2014 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 4,258 $ 1,237 $ 2,276 $ 4,259 $ 491 $ 12,521 Non 310-30 beginning balance 4,029 572 1,984 4,165 491 11,241 Charge-offs (412 ) — — (69 ) (355 ) (836 ) Recoveries 117 — 54 175 150 496 Provision (recoupment) 2,686 38 697 (27 ) 179 3,573 Non 310-30 ending balance 6,420 610 2,735 4,244 465 14,474 ASC 310-30 beginning balance 229 665 292 94 — 1,280 Charge-offs (2 ) — — — (36 ) (38 ) Recoveries — — — — — — Provision (recoupment) (226 ) 132 (58 ) (28 ) 36 (144 ) ASC 310-30 ending balance 1 797 234 66 — 1,098 Ending balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ 147 $ — $ 76 $ 504 $ 3 $ 730 Non 310-30 loans collectively evaluated for impairment 6,273 610 2,659 3,740 462 13,744 ASC 310-30 loans 1 797 234 66 — 1,098 Total ending allowance balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Loans: Non 310-30 individually evaluated for impairment $ 26,320 $ 9,121 $ 3,548 $ 9,137 $ 232 $ 48,358 Non 310-30 collectively evaluated for impairment 614,814 128,367 348,518 562,428 27,069 1,681,196 ASC 310-30 loans 45,844 22,652 238,771 45,472 5,538 358,277 Total loans $ 686,978 $ 160,140 $ 590,837 $ 617,037 $ 32,839 $ 2,087,831 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 $0.5 million net charge-offs of non 310-30 loans during the three months ended June 30, 2015 and $0.7 million net charge-offs of non 310-30 loans during the six months ended June 30, 2015 . Credit quality remained at acceptable levels within the non 310-30 loan portfolio during the three and six months ended June 30, 2015 , and management's evaluation resulted in a provision for loan losses on the non 310-30 loans of $1.9 million and $3.3 million during the three and six months ended June 30, 2015 , respectively. During the six months ended June 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 $8 thousand and $58 thousand , respectively, for the three and six months ended June 30, 2015 . The net provision was comprised primarily of provision of $12 thousand and $144 thousand in the agriculture segment during the three and six months ended June 30, 2015 , respectively, and recoupments of $11 thousand and $96 thousand in the commercial real estate segment during the three and six months ended June 30, 2015 , respectively. The Company charged off $24 thousand and $0.3 million , net of recoveries, of non ASC 310-30 loans during the three and six months ended June 30, 2014 , respectively. With the exception of a large commercial and industrial loan that was added to non-accrual status during the second quarter of 2014, strong credit quality trends of the non 310-30 loan portfolio continued during the three and six months ended June 30, 2014 , and through management's evaluation, resulted in a provision for loan losses on the non 310-30 loans of $1.8 million and $3.6 million during the three and six months ended June 30, 2014 , respectively. During the six months ended June 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 valuations allowances of $90 thousand and $144 thousand for the three and six months ended June 30, 2014 , respectively, which was comprised of reversals of previous valuation allowances of $142 thousand and $226 thousand in the commercial segments, during the three and six months ended June 30, 2014 , respectively.

FDIC Indemnification Asset

FDIC Indemnification Asset	6 Months Ended
	Jun. 30, 2015
Banking and Thrift [Abstract]
FDIC Indemnification Asset	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 six months ended June 30, 2015 and 2014 : For the six months ended June 30, June 30, Balance at beginning of period $ 39,082 $ 64,447 Amortization (14,953 ) (13,567 ) FDIC portion of recoveries exceeding fair value marks (3,409 ) (458 ) Changes for FDIC loss share submissions 2,495 987 Balance at end of period $ 23,215 $ 51,409 The $15.0 million of amortization of the FDIC indemnification asset recognized during the six months ended June 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 six months ended June 30, 2015 , the Company paid a net $2.5 million to the FDIC. During the six months ended June 30, 2014 , the Company recognized $13.6 million of amortization on the FDIC indemnification asset. During the six months ended June 30, 2014 , the Company paid $987 thousand to the FDIC.

Other Real Estate Owned

Other Real Estate Owned	6 Months Ended
	Jun. 30, 2015
Banking and Thrift [Abstract]
Other Real Estate Owned	Other Real Estate Owned A summary of the activity in the OREO balances during the six months ended June 30, 2015 and 2014 is as follows: For the six months ended June 30, 2015 2014 Beginning balance $ 29,120 $ 70,125 Transfers from loan portfolio, at fair value 920 1,477 Impairments (757 ) (880 ) Sales (11,019 ) (16,307 ) Gain on sale of OREO, net 2,103 1,028 Ending balance $ 20,367 $ 55,443 Of the $20.4 million of OREO at June 30, 2015 , $13.4 million , or 65.8% , 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 June 30, 2015 and December 31, 2014 , OREO balances excluded $6.5 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	6 Months Ended
	Jun. 30, 2015
Disclosure of Repurchase Agreements [Abstract]
Federal Home Loan Bank Advances, Disclosure [Text Block]	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 June 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 $166 thousand and $330 thousand for the three and six months ended June 30, 2015 , respectively. More information about FHLB advances at June 30, 2015 is detailed in the table below: Maturity Year June 30, 2015 Rate 2016 $ 15,000 0.84 % 2018 $ 10,000 1.81 % 2020 $ 15,000 2.33 %

Regulatory Capital

Regulatory Capital	6 Months Ended
	Jun. 30, 2015
Banking and Thrift [Abstract]
Regulatory Capital	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. In March 2015, the Bank received approval from the OCC under the OCC Operating Agreement to permanently reduce the Bank's capital by $50.0 million . As a result, the Bank distributed $50.0 million cash to the Company during the first quarter of 2015. At June 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: June 30, 2015 Actual Required to be considered well capitalized (1) Required to be considered adequately capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated 13.5 % $ 648,508 N/A N/A 4 % $ 192,007 NBH Bank, N.A. 11.3 % 538,878 10 % $ 478,176 4 % 191,270 Common equity tier 1 risk-based capital Consolidated 24.0 % $ 648,508 6.5 % $ 312,011 4.5 % $ 216,008 NBH Bank, N.A. 20.1 % 538,878 6.5 % 310,815 4.5 % 215,179 Tier 1 risk-based capital ratio (2) Consolidated 24.0 % $ 648,508 8 % $ 215,999 6 % $ 161,999 NBH Bank, N.A. 20.1 % 538,878 11 % 295,069 6 % 160,947 Total risk-based capital ratio (2) Consolidated 24.8 % $ 669,000 10 % $ 269,998 8 % $ 215,999 NBH Bank, N.A. 20.9 % 559,369 12 % 321,894 8 % 214,596 December 31, 2014 Actual Required to be considered well capitalized (1) Required to be considered adequately capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated 15.0 % $ 712,222 N/A N/A 4 % $ 190,148 NBH Bank, N.A. 12.1 % 573,934 10 % $ 473,478 4 % 189,391 Tier 1 risk-based capital ratio (2) Consolidated 28.9 % $ 712,222 6 % $ 147,796 4 % $ 98,530 NBH Bank, N.A. 23.5 % 573,934 11 % 268,855 4 % 97,766 Total risk-based capital ratio (2) Consolidated 29.6 % $ 730,086 10 % $ 246,326 8 % $ 197,061 NBH Bank, N.A. 24.2 % 591,799 12 % 293,297 8 % 195,531 (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. (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

FDIC Loss Sharing Income	6 Months Ended
	Jun. 30, 2015
Text Block [Abstract]
FDIC Loss Sharing Income	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 six months ended June 30, 2015 and 2014 : For the three months ended For the six months ended June 30, 2015 June 30, 2014 June 30, 2015 June 30, 2014 Clawback liability amortization $ (380 ) $ (336 ) $ (748 ) $ (664 ) Clawback liability remeasurement (2 ) (538 ) (1,109 ) (1,054 ) Reimbursement to FDIC for gain on sale of and income from covered OREO (315 ) (782 ) (987 ) (1,700 ) Reimbursement to FDIC for recoveries (10 ) (33 ) (18 ) (118 ) FDIC reimbursement of covered asset resolution costs 1,845 1,040 3,190 1,930 Total $ 1,138 $ (649 ) $ 328 $ (1,606 )

Stock-based Compensation and Em

Stock-based Compensation and Employee Benefits	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation and Employee Benefits	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 June 30, 2015 , the aggregate number of Class A common stock available for issuance under the 2014 Plan is 5,074,473 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 Company issued stock options and restricted stock in accordance with the plans during the six months ended June 30, 2015 . The following table summarizes stock option activity for the six months ended June 30, 2015 : Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term in Years Aggregate Intrinsic Value Outstanding at December 31, 2014 3,597,111 $ 19.90 4.46 $ 223,211 Granted 136,903 19.09 Forfeited (23,493 ) 18.63 Surrendered (130,841 ) 19.87 Exercised (12,359 ) 19.93 Expired (508,500 ) 20.00 Outstanding at June 30, 2015 3,058,821 $ 19.86 5.10 $ 2,963,912 Options fully vested and exercisable at June 30, 2015 2,715,711 $ 19.98 4.61 $ — Options expected to vest 330,763 $ 18.94 8.67 $ 2,810,087 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 June 30, 2015 and 2014 , respectively, and $0.3 million and $0.6 million for the six months ended June 30, 2015 and 2014 , respectively. At June 30, 2015 , there was $1.0 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 2.3 years. Expense related to non-vested restricted stock totaled $0.7 million and $0.6 million during the three months ended June 30, 2015 and 2014 , respectively, and $1.2 million and $1.0 million during the six months ended June 30, 2015 and 2014 , respectively, and is included in salaries and benefits in the consolidated statements of operations. As of June 30, 2015 , there was $3.6 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 2.4 years. The following table summarizes restricted stock activity for the six months ended June 30, 2015 : Total Restricted Shares Weighted Average Grant-Date Fair Value Unvested at December 31, 2014 955,398 $ 15.16 Vested (50,720 ) 18.80 Granted 165,658 19.13 Forfeited (8,346 ) 18.64 Surrendered (18,762 ) 18.77 Unvested at June 30, 2015 1,043,228 $ 15.58

Warrants

Warrants	6 Months Ended
	Jun. 30, 2015
Warrants and Rights Note Disclosure [Abstract]
Warrants	Warrants At June 30, 2015 and December 31, 2014 , the Company had 830,750 issued and outstanding warrants to purchase Company stock. 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 range from October 20, 2019 to September 30, 2020 . The fair value of the warrants was estimated to be $3.4 million and $3.3 million at June 30, 2015 and December 31, 2014 , respectively. The fair value of the warrants was estimated using a Black-Scholes option pricing model utilizing the following assumptions at the indicated dates: June 30, 2015 December 31, 2014 Risk-free interest rate 1.53 % 1.67 % Expected volatility 21.04 % 24.18 % Expected term (years) 4-5 5-6 Dividend yield 0.96 % 1.03 % 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 an expense of $0.5 million and $0.1 million for the three and six months ended June 30, 2015 , respectively, and a benefit of $0.6 million and $1.5 million for the three and six months ended June 30, 2014 , respectively, in the consolidated statements of operations resulting from the change in fair value of the warrant liability.

Common Stock

Common Stock	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Common Stock	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. During the three and six months ended June 30, 2015 , the Company repurchased 1,807,507 and 3,894,673 shares for $34.7 million and $72.3 million at a weighted average price of $19.16 and $18.55 per share, respectively. The Company had 35,053,339 shares of Class A common stock and zero shares of Class B common stock outstanding as of June 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 June 30, 2015 and December 31, 2014 , the Company had 1,043,228 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 Per Share

Income Per Share	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Income Per Share	Income (Loss) 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 35,053,339 and 42,637,687 shares outstanding (inclusive of Class A and B) as of June 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 six months ended June 30, 2015 . The following table illustrates the computation of basic and diluted (loss) income per share for the three and six months ended June 30, 2015 and 2014 : For the three months ended For the six months ended June 30, June 30, June 30, June 30, Net (loss) income $ (1,341 ) $ 2,129 $ (95 ) $ 3,560 Less: earnings allocated to participating securities — (11 ) — (17 ) (Loss) earnings allocated to common shareholders $ (1,341 ) $ 2,118 $ (95 ) $ 3,543 Weighted average shares outstanding for basic (loss) earnings per common share 36,164,617 43,868,164 37,091,412 44,341,276 Dilutive effect of equity awards — 12,099 — 23,363 Weighted average shares outstanding for diluted earnings per common share 36,164,617 43,880,263 37,091,412 44,364,639 Basic (loss) earnings per share $ (0.04 ) $ 0.05 $ 0.00 $ 0.08 Diluted (loss) earnings per share $ (0.04 ) $ 0.05 $ 0.00 $ 0.08 The Company had 3,058,821 and 3,616,871 outstanding stock options to purchase common stock at weighted average exercise prices of $19.86 and $19.89 per share at June 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 830,750 outstanding warrants to purchase the Company’s common stock as of June 30, 2015 and 2014 . The warrants have an exercise price of $20.00 , which was out-of-the-money for purposes of dilution calculations during the three and six months ended June 30, 2015 . The Company had 1,043,228 and 1,149,014 unvested restricted shares issued as of June 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	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	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 June 30, 2015 and December 31, 2014 . Information about the valuation methods used to measure fair value is provided in note 17 of the unaudited consolidated financial statements. Asset Derivatives Liability Derivatives Fair Value Fair Value Balance Sheet Location June 30, 2015 December 31, 2014 Balance Sheet Location June 30, 2015 December 31, 2014 Derivatives designated as hedging instruments Interest rate products Other assets $ 2,372 $ 10 Other liabilities $ 2,464 $ 3,206 Total derivatives designated as hedging instruments $ 2,372 $ 10 $ 2,464 $ 3,206 Derivatives not designated as hedging instruments Interest rate products Other assets $ 1,414 $ 1,418 Other liabilities $ 1,495 $ 1,522 Total derivatives not designated as hedging instruments $ 1,414 $ 1,418 $ 1,495 $ 1,522 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 June 30, 2015 , the Company had 23 interest rate swaps with a notional amount of $199.9 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 six months ended June 30, 2015 , the Company recognized a net gain of $405 thousand and $266 thousand , respectively, in non-interest income related to hedge ineffectiveness. During the three and six months ended June 30, 2014 , the Company recognized a net loss of $67 thousand and $140 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 June 30, 2015 , the Company had 13 matched interest rate swap transactions with an aggregate notional amount of $51.0 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 six months ended June 30, 2015 and 2014 : Derivatives in fair value hedging relationships Location of gain (loss) recognized in income on derivatives Amount of gain or (loss) recognized in income on derivatives Three months ended June 30, For the six months ended June 30, 2015 2014 2015 2014 Interest rate products Other non-interest income $ 5,256 $ (721 ) $ 3,104 $ (1,335 ) Total $ 5,256 $ (721 ) $ 3,104 $ (1,335 ) Derivatives in fair value hedging relationships Location of gain (loss) recognized in income on derivatives Amount of gain or (loss) recognized in income on hedged items Three months ended June 30, For the six months ended June 30, 2015 2014 2015 2014 Interest rate products Other non-interest income $ (4,851 ) $ 655 $ (2,839 ) $ 1,195 Total $ (4,851 ) $ 655 $ (2,839 ) $ 1,195 Amount of gain or (loss) recognized in income on derivatives Three months ended June 30, For the six months ended June 30, Derivatives not designated as hedging instruments Location of gain (loss) recognized in income on derivatives 2015 2014 2015 2014 Interest rate products Other non-interest expense $ 65 $ (37 ) $ 26 (51 ) Total $ 65 $ (37 ) $ 26 (51 ) 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 June 30, 2015 and December 31, 2014 , the termination value of derivatives in a net liability position related to these agreements was $2.6 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 June 30, 2015 and December 31, 2014 , the Company had posted $3.1 million and $5.5 million , respectively, in eligible collateral.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 June 30, 2015 and December 31, 2014 , the Company had loan commitments totaling $463.2 million and $485.5 million , respectively, and standby letters of credit that totaled $9.4 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 June 30, 2015 and December 31, 2014 were as follows: June 30, 2015 December 31, 2014 Covered Non-covered Total Covered Non-covered Total Commitments to fund loans Residential $ — $ 1,748 $ 1,748 $ — $ 1,683 $ 1,683 Commercial and commercial real estate — 184,563 184,563 11 202,593 202,604 Construction and land development — 42,368 42,368 — 35,814 35,814 Consumer — 4,310 4,310 — 4,376 4,376 Credit card lines of credit — 16,712 16,712 — 18,065 18,065 Unfunded commitments under lines of credit 4,248 209,282 213,530 7,645 215,305 222,950 Commercial and standby letters of credit 71 9,330 9,401 234 9,731 9,965 Total $ 4,319 $ 468,313 $ 472,632 $ 7,890 $ 487,567 $ 495,457 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	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 six months ended June 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 June 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 June 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 sharing. 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 June 30, 2015 and December 31, 2014 on the consolidated statements of financial condition utilizing the hierarchy structure described above: June 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 $ — $ 357,833 $ — $ 357,833 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 958,577 — 958,577 Other securities — — 419 419 Derivatives — 3,786 — 3,786 Total assets at fair value $ — $ 1,320,196 $ 419 $ 1,320,615 Liabilities: Warrant liability $ — $ — $ 3,446 $ 3,446 Clawback liability — — 38,195 38,195 Derivatives — 3,959 — 3,959 Total liabilities at fair value $ — $ 3,959 $ 41,641 $ 45,600 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 $ — $ 404,215 $ — $ 404,215 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 1,074,580 — 1,074,580 Other securities — — 419 419 Derivatives — 1,428 — 1,428 Total assets at fair value $ — $ 1,480,223 $ 419 $ 1,480,642 Liabilities: Warrant liability $ — $ — $ 3,328 $ 3,328 Clawback liability — — 36,338 36,338 Derivatives — 4,728 — 4,728 Total liabilities at fair value $ — $ 4,728 $ 39,666 $ 44,394 The table below details the changes in level 3 financial instruments during the six months ended June 30, 2015 and June 30, 2014 : Warrant liability Clawback liability Balance at December 31, 2013 $ 6,281 $ 32,465 Change in value (1,478 ) 1,054 Amortization — 664 Net change in level 3 $ (1,478 ) $ 1,718 Balance at June 30, 2014 $ 4,803 $ 34,183 Balance at December 31, 2014 $ 3,328 $ 36,338 Change in value 118 748 Amortization — 1,109 Net change in level 3 118 1,857 Balance at June 30, 2015 $ 3,446 $ 38,195 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 six months ended June 30, 2015 , the Company measured six loans not accounted for under ASC 310-30 at fair value on a non-recurring basis. These loans carried specific reserves totaling $0.9 million at June 30, 2015 . During the six months ended June 30, 2015 , the Company added specific reserves of $0.7 million for three loans with carrying balances of $1.8 million at June 30, 2015 . The Company also decreased specific reserves of $0.1 million for three loans during the six months ended June 30, 2015 , primarily due to updated appraisals. 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 six months ended June 30, 2015 , of which $0.5 million , or 65.5% , were on OREO that was covered by loss sharing agreements with the FDIC. During the six months ended June 30, 2014 , the Company recognized $0.9 million of OREO impairments in its unaudited consolidated statements of operations, of which $0.6 million , or 65.1% , 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. Premise 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 six months ended June 30, 2015 . The table below provides information regarding the assets recorded at fair value on a non-recurring basis during the six months ended June 30, 2015 and 2014 : June 30, 2015 Total Losses from fair value changes Other real estate owned $ 20,367 $ 757 Impaired loans 41,241 110 Premise and equipment 813 1,089 June 30, 2014 Total Losses from fair value changes Other real estate owned $ 55,443 $ 880 Impaired loans 48,352 1,242 Premise and equipment — — The Company did not record any liabilities for which the fair value was made on a non-recurring basis during the six months ended June 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 June 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 June 30, 2015 Valuation Technique Unobservable Input Quantitative Measures Other securities $ 419 Cash investment in private equity fund Realizable value Impaired loans 41,241 Appraised value Appraised values Discount rate 0-25% Clawback liability 38,195 Contractually defined discounted cash flows Intrinsic loss estimates $323.3 million - Expected credit losses — Discount rate 4% Warrant liability 3,446 Black-Scholes Volatility 21%-28%

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	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 and Community Banks of Colorado 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 June 30, 2015 and December 31, 2014 , including methods and assumptions utilized for determining fair value of financial instruments, are set forth below: June 30, 2015 December 31, 2014 Level in fair value measurement hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value ASSETS: Cash and cash equivalents Level 1 $ 242,441 $ 242,441 $ 256,979 $ 256,979 Securities purchased under agreements to resell Level 2 50,000 50,011 — — Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 357,833 357,833 404,215 404,215 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 958,577 958,577 1,074,580 1,074,580 Other securities Level 3 419 419 419 419 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 374,915 380,054 422,622 428,323 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 97,690 96,465 107,968 106,314 Capital stock of FHLB Level 2 7,361 7,361 7,595 7,595 Capital stock of FRB Level 2 19,689 19,689 19,450 19,450 Loans receivable, net Level 3 2,308,283 2,347,359 2,144,796 2,193,222 Loans held-for-sale Level 2 10,037 10,037 5,146 5,146 Accrued interest receivable Level 2 10,808 10,808 11,465 11,465 Derivatives Level 2 3,786 3,786 1,428 1,428 LIABILITIES: Deposit transaction accounts Level 2 2,494,950 2,494,950 2,409,137 2,409,137 Time deposits Level 2 1,267,539 1,267,539 1,357,051 1,357,885 Securities sold under agreements to repurchase Level 2 187,314 187,314 133,552 133,552 Federal Home Loan Bank advances Level 2 40,000 40,511 40,000 40,465 Due to FDIC Level 3 38,195 38,195 42,011 42,011 Warrant liability Level 3 3,446 3,446 3,328 3,328 Accrued interest payable Level 2 3,650 3,650 3,608 3,608 Derivatives Level 2 3,959 3,959 4,728 4,728 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 17 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 12 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	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 6, 2015 the Company announced an offer to purchase for cash up to $100.0 million of shares of its issued and outstanding Class A common stock at a price not less than $19.60 and not more than $22.50 per share, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions set forth in the offer. The tender offer expired on July 31, 2015. The Company expects to accept the purchase of approximately 4,651,162 shares at a price of $21.50 , for a total price of $ 100.0 million , excluding fees and expenses. Immediately following the settlement of the tender offer, the Company expects to have approximately 30,404,200 shares of Class A common stock outstanding, excluding 1,037,564 shares of Class A common stock issued but not yet vested. During the second quarter of 2015, the Company approved plans to consolidate three banking centers located in the greater Kansas City market into nearby banking centers, effective September 30, 2015. Included in the three and six months ended June 30, 2015 operating results are $1.1 million of expenses incurred in connection with the consolidations related to fair market value adjustments of banking centers held-for-sale as of June 30, 2015. On August 1, 2015, the Company completed its previously announced acquisition of Pine River Bank Corporation for $9.5 million cash, based on tangible book value at closing, adjusted for certain items. At acquisition date, Pine River Bank Corporation held assets of $140.3 million ; loans of $65.2 million ; deposits of $130.2 million ; and capital of $8.9 million . In June 2015, NBH Bank, N.A. received approval from the OCC under the OCC Operating Agreement to permanently reduce the Bank’s capital by $36.0 million . As a result, the Bank distributed $36.0 million cash to the Company in July 2015, which decreased the Bank's tier 1 leverage ratio to 10.5% .

Recent Accounting Pronounceme29

Recent Accounting Pronouncements - (Policies)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure [Policy Text Block]	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 [Policy Text Block]	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.

Investment Securities - (Tables

Investment Securities - (Tables)	6 Months Ended
	Jun. 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: June 30, 2015 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 349,760 $ 8,279 $ (206 ) $ 357,833 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 971,933 6,471 (19,827 ) 958,577 Other securities 419 — — 419 Total $ 1,322,112 $ 14,750 $ (20,033 ) $ 1,316,829 December 31, 2014 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 395,244 $ 9,014 $ (43 ) $ 404,215 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 1,088,834 7,464 (21,718 ) 1,074,580 Other securities 419 — — 419 Total $ 1,484,497 $ 16,478 $ (21,761 ) $ 1,479,214
Summary of Unrealized Losses	The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period: June 30, 2015 Less than 12 months 12 months or more Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 90,176 $ (206 ) $ — $ — $ 90,176 $ (206 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 86,125 (1,912 ) 577,337 (17,915 ) 663,462 (19,827 ) Total $ 176,301 $ (2,118 ) $ 577,337 $ (17,915 ) $ 753,638 $ (20,033 ) December 31, 2014 Less than 12 months 12 months or more Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 17 $ — $ 89,749 $ (43 ) $ 89,766 $ (43 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 88,854 (2,053 ) 667,368 (19,665 ) 756,222 (21,718 ) Total $ 88,871 $ (2,053 ) $ 757,117 $ (19,708 ) $ 845,988 $ (21,761 )
Held-to-maturity Securities	Held-to-maturity investment securities are summarized as follows as of the dates indicated: June 30, 2015 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 374,915 $ 5,287 $ (148 ) $ 380,054 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 97,690 346 (1,571 ) 96,465 Total investment securities held-to-maturity $ 472,605 $ 5,633 $ (1,719 ) $ 476,519 December 31, 2014 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 422,622 $ 5,773 $ (72 ) $ 428,323 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 107,968 217 (1,871 ) 106,314 Total investment securities held-to-maturity $ 530,590 $ 5,990 $ (1,943 ) $ 534,637
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: June 30, 2015 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 30,744 $ (112 ) $ 1,902 $ (36 ) $ 32,646 $ (148 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 18,762 (55 ) 50,233 (1,516 ) 68,995 (1,571 ) Total $ 49,506 $ (167 ) $ 52,135 $ (1,552 ) $ 101,641 $ (1,719 ) December 31, 2014 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ — $ 35,139 $ (72 ) $ 35,139 $ (72 ) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — — 75,139 (1,871 ) 75,139 (1,871 ) Total $ — $ — $ 110,278 $ (1,943 ) $ 110,278 $ (1,943 )

Loans - (Tables)

Loans - (Tables)	6 Months Ended
	Jun. 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 $8.3 million and $10.5 million as of June 30, 2015 and December 31, 2014 , respectively: June 30, 2015 ASC 310-30 loans Non 310-30 loans Total loans % of total Commercial $ 21,417 $ 895,309 $ 916,726 39.4 % Agriculture 18,486 122,468 140,954 6.1 % Commercial real estate 166,481 416,885 583,366 25.0 % Residential real estate 31,162 623,167 654,329 28.1 % Consumer 3,749 29,400 33,149 1.4 % Total $ 241,295 $ 2,087,229 $ 2,328,524 100.0 % Covered $ 139,250 $ 27,899 $ 167,149 7.2 % Non-covered 102,045 2,059,330 2,161,375 92.8 % Total $ 241,295 $ 2,087,229 $ 2,328,524 100.0 % December 31, 2014 ASC 310-30 loans Non 310-30 Total loans % of total Commercial $ 22,956 $ 772,440 $ 795,396 36.8 % Agriculture 19,063 118,468 137,531 6.4 % Commercial real estate 192,330 369,264 561,594 26.0 % Residential real estate 40,761 591,939 632,700 29.2 % Consumer 4,535 30,653 35,188 1.6 % Total $ 279,645 $ 1,882,764 $ 2,162,409 100.0 % Covered $ 160,876 $ 32,821 $ 193,697 9.0 % Non-covered 118,769 1,849,943 1,968,712 91.0 % Total $ 279,645 $ 1,882,764 $ 2,162,409 100.0 %
Past Due Financing Receivables	Loan delinquency for all loans is shown in the following tables at June 30, 2015 and December 31, 2014 , respectively: Total Loans June 30, 2015 30-59 days past due 60-89 days past due Greater than 90 days past due Total past due Current Total loans Loans > 90 days past due and still accruing Non- accrual Loans excluded from ASC 310-30 Commercial $ 5,998 $ 134 $ 1,089 $ 7,221 $ 888,088 $ 895,309 $ 22 $ 10,311 Agriculture 135 — — 135 122,333 122,468 — 265 Commercial real estate Construction — — — — 10,772 10,772 — — Acquisition/development — — — — 4,001 4,001 — — Multifamily — — — — 17,120 17,120 — — Owner-occupied — — 113 113 146,396 146,509 — 726 Non owner-occupied 1,383 208 — 1,591 236,892 238,483 — 49 Total commercial real estate 1,383 208 113 1,704 415,181 416,885 — 775 Residential real estate Senior lien 653 — 1,250 1,903 568,038 569,941 — 3,313 Junior lien 160 8 — 168 53,058 53,226 — 382 Total residential real estate 813 8 1,250 2,071 621,096 623,167 — 3,695 Consumer 240 4 — 244 29,156 29,400 — 31 Total loans excluded from ASC 310-30 $ 8,569 $ 354 $ 2,452 $ 11,375 $ 2,075,854 $ 2,087,229 $ 22 $ 15,077 Covered loans excluded from ASC 310-30 $ 3 $ — $ 1,052 $ 1,055 $ 26,844 $ 27,899 $ — $ 1,140 Non-covered loans excluded from ASC 310-30 8,566 354 1,400 10,320 2,049,010 2,059,330 22 13,937 Total loans excluded from ASC 310-30 $ 8,569 $ 354 $ 2,452 $ 11,375 $ 2,075,854 $ 2,087,229 $ 22 $ 15,077 Loans accounted for under ASC 310-30 Commercial $ 418 $ 70 $ 742 $ 1,230 $ 20,187 $ 21,417 $ 742 $ — Agriculture 374 — 65 439 18,047 18,486 65 — Commercial real estate 884 145 21,736 22,765 143,716 166,481 21,736 — Residential real estate 147 — 2,290 2,437 28,725 31,162 2,290 — Consumer 165 — 21 186 3,563 3,749 21 — Total loans accounted for under ASC 310-30 $ 1,988 $ 215 $ 24,854 $ 27,057 $ 214,238 $ 241,295 $ 24,854 $ — Covered loans accounted for under ASC 310-30 $ 1,197 $ — $ 23,078 $ 24,275 $ 114,975 $ 139,250 $ 23,080 $ — Non-covered loans accounted for under ASC 310-30 791 215 1,776 2,782 99,263 102,045 1,774 — Total loans accounted for under ASC 310-30 $ 1,988 $ 215 $ 24,854 $ 27,057 $ 214,238 $ 241,295 $ 24,854 $ — Total loans $ 10,557 $ 569 $ 27,306 $ 38,432 $ 2,290,092 $ 2,328,524 $ 24,876 $ 15,077 Covered loans $ 1,200 $ — $ 24,130 $ 25,330 $ 141,819 $ 167,149 $ 23,080 $ 1,140 Non-covered loans 9,357 569 3,176 13,102 2,148,273 2,161,375 1,796 13,937 Total loans $ 10,557 $ 569 $ 27,306 $ 38,432 $ 2,290,092 $ 2,328,524 $ 24,876 $ 15,077 Total Loans December 31, 2014 30-59 days past due 60-89 days past due Greater than 90 days past due Total past due Current Total loans Loans > 90 days past due and still accruing Non- accrual Loans excluded from ASC 310-30 Commercial $ 83 $ 97 $ 318 $ 498 $ 771,942 $ 772,440 $ 215 $ 4,215 Agriculture 47 — 10 57 118,411 118,468 10 495 Commercial real estate Construction — — — — 11,748 11,748 — — Acquisition/development 41 — — 41 4,532 4,573 — — Multifamily — — — — 10,856 10,856 (1 ) — Owner-occupied 336 78 101 515 119,710 120,225 — 843 Non owner-occupied 158 — 222 380 221,482 221,862 — 222 Total commercial real estate 535 78 323 936 368,328 369,264 (1 ) 1,065 Residential real estate Senior lien 378 1,403 732 2,513 537,022 539,535 — 4,335 Junior lien 133 1 101 235 52,169 52,404 — 476 Total residential real estate 511 1,404 833 2,748 589,191 591,939 — 4,811 Consumer 266 21 39 326 30,327 30,653 39 227 Total loans excluded from ASC 310-30 $ 1,442 $ 1,600 $ 1,523 $ 4,565 $ 1,878,199 $ 1,882,764 $ 263 $ 10,813 Covered loans excluded from ASC 310-30 $ 17 $ 1,016 $ 152 $ 1,185 $ 31,636 $ 32,821 $ 75 $ 1,317 Non-covered loans excluded from ASC 310-30 1,425 584 1,371 3,380 1,846,563 1,849,943 188 9,496 Total loans excluded from ASC 310-30 $ 1,442 $ 1,600 $ 1,523 $ 4,565 $ 1,878,199 $ 1,882,764 $ 263 $ 10,813 Loans accounted for under ASC 310-30 Commercial $ 152 $ — $ 1,755 $ 1,907 $ 21,049 $ 22,956 $ 1,754 $ — Agriculture — — 367 367 18,696 19,063 367 — Commercial real estate 564 92 31,013 31,669 160,661 192,330 31,013 — Residential real estate 2,014 3,826 646 6,486 34,275 40,761 646 — Consumer 369 — 54 423 4,112 4,535 54 — Total loans accounted for under ASC 310-30 $ 3,099 $ 3,918 $ 33,835 $ 40,852 $ 238,793 $ 279,645 $ 33,834 $ — Covered loans accounted for under ASC 310-30 $ 576 $ 3,892 $ 31,239 $ 35,707 $ 125,169 $ 160,876 $ 31,238 $ — Non-covered loans accounted for under ASC 310-30 2,523 26 2,596 5,145 113,624 118,769 2,596 — Total loans accounted for under ASC 310-30 $ 3,099 $ 3,918 $ 33,835 $ 40,852 $ 238,793 $ 279,645 $ 33,834 $ — Total loans $ 4,541 $ 5,518 $ 35,358 $ 45,417 $ 2,116,992 $ 2,162,409 $ 34,097 $ 10,813 Covered loans $ 593 $ 4,908 $ 31,391 $ 36,892 $ 156,805 $ 193,697 $ 31,313 $ 1,317 Non-covered loans 3,948 610 3,967 8,525 1,960,187 1,968,712 2,784 9,496 Total loans $ 4,541 $ 5,518 $ 35,358 $ 45,417 $ 2,116,992 $ 2,162,409 $ 34,097 $ 10,813
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 June 30, 2015 and December 31, 2014 , respectively: Total Loans June 30, 2015 Pass Special mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ 819,981 $ 29,415 $ 45,234 $ 679 $ 895,309 Agriculture 109,723 12,130 615 — 122,468 Commercial real estate Construction 10,772 — — — 10,772 Acquisition/development 4,001 — — — 4,001 Multifamily 17,120 — — — 17,120 Owner-occupied 142,378 149 3,982 — 146,509 Non owner-occupied 230,394 4,856 3,228 5 238,483 Total commercial real estate 404,665 5,005 7,210 5 416,885 Residential real estate Senior lien 564,946 — 4,826 169 569,941 Junior lien 52,061 — 1,165 — 53,226 Total residential real estate 617,007 — 5,991 169 623,167 Consumer 29,369 — 31 — 29,400 Total loans excluded from ASC 310-30 $ 1,980,745 $ 46,550 $ 59,081 $ 853 $ 2,087,229 Covered loans excluded from ASC 310-30 $ 16,594 $ 163 $ 10,994 $ 148 $ 27,899 Non-covered loans excluded from ASC 310-30 1,964,151 46,387 48,087 705 2,059,330 Total loans excluded from ASC 310-30 $ 1,980,745 $ 46,550 $ 59,081 $ 853 $ 2,087,229 Loans accounted for under ASC 310-30 Commercial $ 9,813 $ 446 $ 10,854 $ 304 $ 21,417 Agriculture 10,616 6,028 1,842 — 18,486 Commercial real estate 74,320 3,319 85,073 3,769 166,481 Residential real estate 23,198 1,211 6,753 — 31,162 Consumer 3,241 100 408 — 3,749 Total loans accounted for under ASC 310-30 $ 121,188 $ 11,104 $ 104,930 $ 4,073 $ 241,295 Covered loans accounted for under ASC 310-30 $ 39,446 $ 8,901 $ 86,830 $ 4,073 $ 139,250 Non-covered loans accounted for under ASC 310-30 81,742 2,203 18,100 — 102,045 Total loans accounted for under ASC 310-30 $ 121,188 $ 11,104 $ 104,930 $ 4,073 $ 241,295 Total loans $ 2,101,933 $ 57,654 $ 164,011 $ 4,926 $ 2,328,524 Total covered $ 56,040 $ 9,064 $ 97,824 $ 4,221 $ 167,149 Total non-covered 2,045,893 48,590 66,187 705 2,161,375 Total loans $ 2,101,933 $ 57,654 $ 164,011 $ 4,926 $ 2,328,524 Total Loans December 31, 2014 Pass Special mention Substandard Doubtful Total Loans excluded from ASC 310-30 Commercial $ 742,944 $ 10,166 $ 19,250 $ 80 $ 772,440 Agriculture 114,642 85 3,741 — 118,468 Commercial real estate Construction 11,748 — — — 11,748 Acquisition/development 4,573 — — — 4,573 Multifamily 10,856 — — — 10,856 Owner-occupied 115,178 158 4,889 — 120,225 Non owner-occupied 199,817 17,607 4,430 8 221,862 Total commercial real estate 342,172 17,765 9,319 8 369,264 Residential real estate Senior lien 533,630 23 5,744 138 539,535 Junior lien 51,059 — 1,345 — 52,404 Total residential real estate 584,689 23 7,089 138 591,939 Consumer 30,426 — 227 — 30,653 Total loans excluded from ASC 310-30 $ 1,814,873 $ 28,039 $ 39,626 $ 226 $ 1,882,764 Covered loans excluded from ASC 310-30 $ 21,240 $ 171 $ 11,301 $ 109 $ 32,821 Non-covered loans excluded from ASC 310-30 1,793,633 27,868 28,325 117 1,849,943 Total loans excluded from ASC 310-30 $ 1,814,873 $ 28,039 $ 39,626 $ 226 $ 1,882,764 Loans accounted for under ASC 310-30 Commercial $ 11,038 $ 282 $ 11,092 $ 544 $ 22,956 Agriculture 16,854 30 2,179 — 19,063 Commercial real estate 82,603 3,770 101,966 3,991 192,330 Residential real estate 29,069 1,403 10,289 — 40,761 Consumer 3,641 105 789 — 4,535 Total loans accounted for under ASC 310-30 $ 143,205 $ 5,590 $ 126,315 $ 4,535 $ 279,645 Covered loans accounted for under ASC 310-30 $ 49,856 $ 3,036 $ 103,451 $ 4,533 $ 160,876 Non-covered loans accounted for under ASC 310-30 93,349 2,554 22,864 2 118,769 Total loans accounted for under ASC 310-30 $ 143,205 $ 5,590 $ 126,315 $ 4,535 $ 279,645 Total loans $ 1,958,078 $ 33,629 $ 165,941 $ 4,761 $ 2,162,409 Total covered $ 71,096 $ 3,207 $ 114,752 $ 4,642 $ 193,697 Total non-covered 1,886,982 30,422 51,189 119 1,968,712 Total loans $ 1,958,078 $ 33,629 $ 165,941 $ 4,761 $ 2,162,409
Schedule Of Impaired Financing Receivable With And Without Related Allowance	Additional information regarding impaired loans at June 30, 2015 and December 31, 2014 is set forth in the table below: Impaired Loans June 30, 2015 December 31, 2014 Unpaid principal balance Recorded investment Allowance for loan losses allocated Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded: Commercial $ 28,570 $ 28,283 $ — $ 16,953 $ 16,771 $ — Agriculture — — — 3,065 3,061 — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Owner-occupied 2,145 1,876 — 1,164 970 — Non-owner occupied — — — — — — Total commercial real estate 2,145 1,876 — 1,164 970 — Residential real estate Senior lien 349 310 — 694 248 — Junior lien — — — — — — Total residential real estate 349 310 — 694 248 — Consumer — — — — — — Total impaired loans with no related allowance recorded $ 31,064 $ 30,469 $ — $ 21,876 $ 21,050 $ — With a related allowance recorded: Commercial $ 1,678 $ 1,502 $ 681 $ 894 $ 693 $ 82 Agriculture 390 362 2 177 145 — Commercial real estate Construction — — — — — — Acquisition/development — — — — — — Multifamily 39 38 — — — — Owner-occupied 1,238 918 2 1,321 1,024 5 Non-owner occupied 922 846 6 1,140 1,060 9 Total commercial real estate 2,199 1,802 8 2,461 2,084 14 Residential real estate Senior lien 6,372 5,760 193 7,360 6,359 172 Junior lien 1,560 1,300 9 1,768 1,515 9 Total residential real estate 7,932 7,060 202 9,128 7,874 181 Consumer 48 46 — 277 245 2 Total impaired loans with a related allowance recorded $ 12,247 $ 10,772 $ 893 $ 12,937 $ 11,041 $ 279 Total impaired loans $ 43,311 $ 41,241 $ 893 $ 34,813 $ 32,091 $ 279
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 the six months ended June 30, 2015 June 30, 2014 Average recorded investment Interest income recognized Average recorded investment Interest income recognized With no related allowance recorded: Commercial $ 28,670 $ 357 $ 25,329 $ 150 Agriculture — — 9,028 108 Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily — — — — Owner-occupied 1,910 35 1,603 47 Non owner-occupied — — 473 15 Total commercial real estate 1,910 35 2,076 62 Residential real estate Senior lien 315 9 405 5 Junior lien — — — — Total residential real estate 315 9 405 5 Consumer — — — — Total impaired loans with no related allowance recorded $ 30,895 $ 401 $ 36,838 $ 325 With a related allowance recorded: Commercial $ 1,549 $ 1 $ 1,793 $ 4 Agriculture 407 2 171 — Commercial real estate Construction — — — — Acquisition/development — — — — Multifamily 39 — 874 — Owner-occupied 960 13 811 7 Non owner-occupied 863 26 659 13 Total commercial real estate 1,862 39 2,344 20 Residential real estate Senior lien 5,880 59 7,344 52 Junior lien 1,326 26 1,540 30 Total residential real estate 7,206 85 8,884 82 Consumer 49 — 240 — Total impaired loans with a related allowance recorded $ 11,073 $ 127 $ 13,432 $ 106 Total impaired loans $ 41,968 $ 528 $ 50,270 $ 431
Additional Information Related to Accruing TDR's	The table below provides additional information related to accruing TDRs at June 30, 2015 and December 31, 2014 : Accruing TDRs June 30, 2015 Recorded investment Average year-to- date recorded investment Unpaid principal balance Unfunded commitments to fund TDRs Commercial $ 12,635 $ 12,870 $ 12,765 $ 1,887 Agriculture 97 99 101 — Commercial real estate 394 399 399 — Residential real estate 2,071 2,105 2,119 2 Consumer 15 16 15 — Total $ 15,212 $ 15,489 $ 15,399 $ 1,889 Accruing TDRs December 31, 2014 Recorded investment Average year-to- date recorded investment Unpaid principal balance Unfunded commitments to fund TDRs Commercial $ 13,249 $ 12,496 $ 13,249 $ 375 Agriculture 2,711 3,110 2,715 — Commercial real estate 610 627 622 — Residential real estate 2,687 2,767 2,714 2 Consumer 18 20 18 — Total $ 19,275 $ 19,020 $ 19,318 $ 377
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 June 30, 2015 and December 31, 2014 : Non - Accruing TDRs June 30, 2015 December 31, 2014 Covered Non-covered Covered Non-covered Commercial $ — $ 3,332 $ 1 $ 3,993 Agriculture 81 154 201 164 Commercial real estate 75 300 94 364 Residential real estate 875 567 910 1,056 Consumer — 2 — 190 Total $ 1,031 $ 4,355 $ 1,206 $ 5,767
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 six months ended June 30, 2015 and 2014 : June 30, June 30, Accretable yield beginning balance $ 113,463 $ 130,624 Reclassification from non-accretable difference 15,823 18,658 Reclassification to non-accretable difference (1,390 ) (909 ) Accretion (24,466 ) (32,278 ) Accretable yield ending balance $ 103,430 $ 116,095
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 June 30, 2015 and December 31, 2014 : June 30, December 31, Contractual cash flows $ 689,116 $ 751,932 Non-accretable difference (344,391 ) (358,824 ) Accretable yield (103,430 ) (113,463 ) Loans accounted for under ASC 310-30 $ 241,295 $ 279,645

Allowance for Loan Losses - (Ta

Allowance for Loan Losses - (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2015 and 2014 : Three months ended June 30, 2015 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 9,920 $ 1,151 $ 3,665 $ 3,787 $ 350 $ 18,873 Non 310-30 beginning balance 9,900 551 3,528 3,787 336 18,102 Charge-offs (1 ) — (220 ) (95 ) (357 ) (673 ) Recoveries 26 7 109 — 55 197 Provision 99 135 287 955 374 1,850 Non 310-30 ending balance 10,024 693 3,704 4,647 408 19,476 ASC 310-30 beginning balance 20 600 137 — 14 771 Charge-offs — — — — (14 ) (14 ) Recoveries — — — — — — Provision (recoupment) — 12 (11 ) 2 5 8 ASC 310-30 ending balance 20 612 126 2 5 765 Ending balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Three months ended June 30, 2014 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 5,724 $ 1,213 $ 2,213 $ 4,234 $ 588 $ 13,972 Non 310-30 beginning balance 5,581 548 1,977 4,169 473 12,748 Charge-offs (26 ) — — (49 ) (184 ) (259 ) Recoveries 59 — 17 85 74 235 Provision 806 62 741 39 102 1,750 Non 310-30 ending balance 6,420 610 2,735 4,244 465 14,474 ASC 310-30 beginning balance 143 665 236 65 115 1,224 Charge-offs — — — — (36 ) (36 ) Recoveries — — — — — — Provision (recoupment) (142 ) 132 (2 ) 1 (79 ) (90 ) ASC 310-30 ending balance 1 797 234 66 — 1,098 Ending balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Six months ended June 30, 2015 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 8,598 $ 1,009 $ 3,819 $ 3,771 $ 416 $ 17,613 Non 310-30 beginning balance 8,598 541 3,597 3,743 413 16,892 Charge-offs (4 ) (47 ) (222 ) (177 ) (565 ) (1,015 ) Recoveries 47 7 124 30 138 346 Provision 1,383 192 205 1,051 422 3,253 Non 310-30 ending balance 10,024 693 3,704 4,647 408 19,476 ASC 310-30 beginning balance — 468 222 28 3 721 Charge-offs — — — — (14 ) (14 ) Recoveries — — — — — — Provision (recoupment) 20 144 (96 ) (26 ) 16 58 ASC 310-30 ending balance 20 612 126 2 5 765 Ending balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ 681 $ 2 $ 8 $ 202 $ — $ 893 Non 310-30 loans collectively evaluated for impairment 9,343 691 3,696 4,445 408 18,583 ASC 310-30 loans 20 612 126 2 5 765 Total ending allowance balance $ 10,044 $ 1,305 $ 3,830 $ 4,649 $ 413 $ 20,241 Loans: Non 310-30 individually evaluated for impairment $ 29,785 $ 362 $ 3,677 $ 7,371 $ 46 $ 41,241 Non 310-30 collectively evaluated for impairment 865,524 122,106 413,208 615,796 29,354 2,045,988 ASC 310-30 loans 21,417 18,486 166,481 31,162 3,749 241,295 Total loans $ 916,726 $ 140,954 $ 583,366 $ 654,329 $ 33,149 $ 2,328,524 Six months ended June 30, 2014 Commercial Agriculture Commercial real estate Residential real estate Consumer Total Beginning balance $ 4,258 $ 1,237 $ 2,276 $ 4,259 $ 491 $ 12,521 Non 310-30 beginning balance 4,029 572 1,984 4,165 491 11,241 Charge-offs (412 ) — — (69 ) (355 ) (836 ) Recoveries 117 — 54 175 150 496 Provision (recoupment) 2,686 38 697 (27 ) 179 3,573 Non 310-30 ending balance 6,420 610 2,735 4,244 465 14,474 ASC 310-30 beginning balance 229 665 292 94 — 1,280 Charge-offs (2 ) — — — (36 ) (38 ) Recoveries — — — — — — Provision (recoupment) (226 ) 132 (58 ) (28 ) 36 (144 ) ASC 310-30 ending balance 1 797 234 66 — 1,098 Ending balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Ending allowance balance attributable to: Non 310-30 loans individually evaluated for impairment $ 147 $ — $ 76 $ 504 $ 3 $ 730 Non 310-30 loans collectively evaluated for impairment 6,273 610 2,659 3,740 462 13,744 ASC 310-30 loans 1 797 234 66 — 1,098 Total ending allowance balance $ 6,421 $ 1,407 $ 2,969 $ 4,310 $ 465 $ 15,572 Loans: Non 310-30 individually evaluated for impairment $ 26,320 $ 9,121 $ 3,548 $ 9,137 $ 232 $ 48,358 Non 310-30 collectively evaluated for impairment 614,814 128,367 348,518 562,428 27,069 1,681,196 ASC 310-30 loans 45,844 22,652 238,771 45,472 5,538 358,277 Total loans $ 686,978 $ 160,140 $ 590,837 $ 617,037 $ 32,839 $ 2,087,831

FDIC Indemnification Asset - (T

FDIC Indemnification Asset - (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2015 and 2014 : For the six months ended June 30, June 30, Balance at beginning of period $ 39,082 $ 64,447 Amortization (14,953 ) (13,567 ) FDIC portion of recoveries exceeding fair value marks (3,409 ) (458 ) Changes for FDIC loss share submissions 2,495 987 Balance at end of period $ 23,215 $ 51,409

Other Real Estate Owned - (Tabl

Other Real Estate Owned - (Tables)	6 Months Ended
	Jun. 30, 2015
Banking and Thrift [Abstract]
Summary of Activity in OREO Balances	A summary of the activity in the OREO balances during the six months ended June 30, 2015 and 2014 is as follows: For the six months ended June 30, 2015 2014 Beginning balance $ 29,120 $ 70,125 Transfers from loan portfolio, at fair value 920 1,477 Impairments (757 ) (880 ) Sales (11,019 ) (16,307 ) Gain on sale of OREO, net 2,103 1,028 Ending balance $ 20,367 $ 55,443

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Repurchase Agreements [Abstract]
Federal Home Loan Bank, Advances	More information about FHLB advances at June 30, 2015 is detailed in the table below: Maturity Year June 30, 2015 Rate 2016 $ 15,000 0.84 % 2018 $ 10,000 1.81 % 2020 $ 15,000 2.33 %

Regulatory Capital - (Tables)

Regulatory Capital - (Tables)	6 Months Ended
	Jun. 30, 2015
Banking and Thrift [Abstract]
Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements	At June 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: June 30, 2015 Actual Required to be considered well capitalized (1) Required to be considered adequately capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated 13.5 % $ 648,508 N/A N/A 4 % $ 192,007 NBH Bank, N.A. 11.3 % 538,878 10 % $ 478,176 4 % 191,270 Common equity tier 1 risk-based capital Consolidated 24.0 % $ 648,508 6.5 % $ 312,011 4.5 % $ 216,008 NBH Bank, N.A. 20.1 % 538,878 6.5 % 310,815 4.5 % 215,179 Tier 1 risk-based capital ratio (2) Consolidated 24.0 % $ 648,508 8 % $ 215,999 6 % $ 161,999 NBH Bank, N.A. 20.1 % 538,878 11 % 295,069 6 % 160,947 Total risk-based capital ratio (2) Consolidated 24.8 % $ 669,000 10 % $ 269,998 8 % $ 215,999 NBH Bank, N.A. 20.9 % 559,369 12 % 321,894 8 % 214,596 December 31, 2014 Actual Required to be considered well capitalized (1) Required to be considered adequately capitalized Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio Consolidated 15.0 % $ 712,222 N/A N/A 4 % $ 190,148 NBH Bank, N.A. 12.1 % 573,934 10 % $ 473,478 4 % 189,391 Tier 1 risk-based capital ratio (2) Consolidated 28.9 % $ 712,222 6 % $ 147,796 4 % $ 98,530 NBH Bank, N.A. 23.5 % 573,934 11 % 268,855 4 % 97,766 Total risk-based capital ratio (2) Consolidated 29.6 % $ 730,086 10 % $ 246,326 8 % $ 197,061 NBH Bank, N.A. 24.2 % 591,799 12 % 293,297 8 % 195,531 (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. (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 - (Tab

FDIC Loss Sharing Income - (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2015 and 2014 : For the three months ended For the six months ended June 30, 2015 June 30, 2014 June 30, 2015 June 30, 2014 Clawback liability amortization $ (380 ) $ (336 ) $ (748 ) $ (664 ) Clawback liability remeasurement (2 ) (538 ) (1,109 ) (1,054 ) Reimbursement to FDIC for gain on sale of and income from covered OREO (315 ) (782 ) (987 ) (1,700 ) Reimbursement to FDIC for recoveries (10 ) (33 ) (18 ) (118 ) FDIC reimbursement of covered asset resolution costs 1,845 1,040 3,190 1,930 Total $ 1,138 $ (649 ) $ 328 $ (1,606 )

Stock-based Compensation and 38

Stock-based Compensation and Employee Benefits - (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	The following table summarizes stock option activity for the six months ended June 30, 2015 : Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term in Years Aggregate Intrinsic Value Outstanding at December 31, 2014 3,597,111 $ 19.90 4.46 $ 223,211 Granted 136,903 19.09 Forfeited (23,493 ) 18.63 Surrendered (130,841 ) 19.87 Exercised (12,359 ) 19.93 Expired (508,500 ) 20.00 Outstanding at June 30, 2015 3,058,821 $ 19.86 5.10 $ 2,963,912 Options fully vested and exercisable at June 30, 2015 2,715,711 $ 19.98 4.61 $ — Options expected to vest 330,763 $ 18.94 8.67 $ 2,810,087
Summary of Restricted Stock Activity	The following table summarizes restricted stock activity for the six months ended June 30, 2015 : Total Restricted Shares Weighted Average Grant-Date Fair Value Unvested at December 31, 2014 955,398 $ 15.16 Vested (50,720 ) 18.80 Granted 165,658 19.13 Forfeited (8,346 ) 18.64 Surrendered (18,762 ) 18.77 Unvested at June 30, 2015 1,043,228 $ 15.58

Warrants (Tables)

Warrants (Tables)	6 Months Ended
	Jun. 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: June 30, 2015 December 31, 2014 Risk-free interest rate 1.53 % 1.67 % Expected volatility 21.04 % 24.18 % Expected term (years) 4-5 5-6 Dividend yield 0.96 % 1.03 %

Income Per Share - (Tables)

Income Per Share - (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Income Per Share	The following table illustrates the computation of basic and diluted (loss) income per share for the three and six months ended June 30, 2015 and 2014 : For the three months ended For the six months ended June 30, June 30, June 30, June 30, Net (loss) income $ (1,341 ) $ 2,129 $ (95 ) $ 3,560 Less: earnings allocated to participating securities — (11 ) — (17 ) (Loss) earnings allocated to common shareholders $ (1,341 ) $ 2,118 $ (95 ) $ 3,543 Weighted average shares outstanding for basic (loss) earnings per common share 36,164,617 43,868,164 37,091,412 44,341,276 Dilutive effect of equity awards — 12,099 — 23,363 Weighted average shares outstanding for diluted earnings per common share 36,164,617 43,880,263 37,091,412 44,364,639 Basic (loss) earnings per share $ (0.04 ) $ 0.05 $ 0.00 $ 0.08 Diluted (loss) earnings per share $ (0.04 ) $ 0.05 $ 0.00 $ 0.08

Derivatives - (Tables)

Derivatives - (Tables)	6 Months Ended
	Jun. 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 17 of the unaudited consolidated financial statements. Asset Derivatives Liability Derivatives Fair Value Fair Value Balance Sheet Location June 30, 2015 December 31, 2014 Balance Sheet Location June 30, 2015 December 31, 2014 Derivatives designated as hedging instruments Interest rate products Other assets $ 2,372 $ 10 Other liabilities $ 2,464 $ 3,206 Total derivatives designated as hedging instruments $ 2,372 $ 10 $ 2,464 $ 3,206 Derivatives not designated as hedging instruments Interest rate products Other assets $ 1,414 $ 1,418 Other liabilities $ 1,495 $ 1,522 Total derivatives not designated as hedging instruments $ 1,414 $ 1,418 $ 1,495 $ 1,522
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 six months ended June 30, 2015 and 2014 : Derivatives in fair value hedging relationships Location of gain (loss) recognized in income on derivatives Amount of gain or (loss) recognized in income on derivatives Three months ended June 30, For the six months ended June 30, 2015 2014 2015 2014 Interest rate products Other non-interest income $ 5,256 $ (721 ) $ 3,104 $ (1,335 ) Total $ 5,256 $ (721 ) $ 3,104 $ (1,335 ) Derivatives in fair value hedging relationships Location of gain (loss) recognized in income on derivatives Amount of gain or (loss) recognized in income on hedged items Three months ended June 30, For the six months ended June 30, 2015 2014 2015 2014 Interest rate products Other non-interest income $ (4,851 ) $ 655 $ (2,839 ) $ 1,195 Total $ (4,851 ) $ 655 $ (2,839 ) $ 1,195 Amount of gain or (loss) recognized in income on derivatives Three months ended June 30, For the six months ended June 30, Derivatives not designated as hedging instruments Location of gain (loss) recognized in income on derivatives 2015 2014 2015 2014 Interest rate products Other non-interest expense $ 65 $ (37 ) $ 26 (51 ) Total $ 65 $ (37 ) $ 26 (51 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Total Unfunded Commitments	Total unfunded commitments at June 30, 2015 and December 31, 2014 were as follows: June 30, 2015 December 31, 2014 Covered Non-covered Total Covered Non-covered Total Commitments to fund loans Residential $ — $ 1,748 $ 1,748 $ — $ 1,683 $ 1,683 Commercial and commercial real estate — 184,563 184,563 11 202,593 202,604 Construction and land development — 42,368 42,368 — 35,814 35,814 Consumer — 4,310 4,310 — 4,376 4,376 Credit card lines of credit — 16,712 16,712 — 18,065 18,065 Unfunded commitments under lines of credit 4,248 209,282 213,530 7,645 215,305 222,950 Commercial and standby letters of credit 71 9,330 9,401 234 9,731 9,965 Total $ 4,319 $ 468,313 $ 472,632 $ 7,890 $ 487,567 $ 495,457

Fair Value Measurements - (Tabl

Fair Value Measurements - (Tables)	6 Months Ended
	Jun. 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 June 30, 2015 and December 31, 2014 on the consolidated statements of financial condition utilizing the hierarchy structure described above: June 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 $ — $ 357,833 $ — $ 357,833 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 958,577 — 958,577 Other securities — — 419 419 Derivatives — 3,786 — 3,786 Total assets at fair value $ — $ 1,320,196 $ 419 $ 1,320,615 Liabilities: Warrant liability $ — $ — $ 3,446 $ 3,446 Clawback liability — — 38,195 38,195 Derivatives — 3,959 — 3,959 Total liabilities at fair value $ — $ 3,959 $ 41,641 $ 45,600 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 $ — $ 404,215 $ — $ 404,215 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 1,074,580 — 1,074,580 Other securities — — 419 419 Derivatives — 1,428 — 1,428 Total assets at fair value $ — $ 1,480,223 $ 419 $ 1,480,642 Liabilities: Warrant liability $ — $ — $ 3,328 $ 3,328 Clawback liability — — 36,338 36,338 Derivatives — 4,728 — 4,728 Total liabilities at fair value $ — $ 4,728 $ 39,666 $ 44,394
Table of Changes in Level 3 Financial Instruments	The table below details the changes in level 3 financial instruments during the six months ended June 30, 2015 and June 30, 2014 : Warrant liability Clawback liability Balance at December 31, 2013 $ 6,281 $ 32,465 Change in value (1,478 ) 1,054 Amortization — 664 Net change in level 3 $ (1,478 ) $ 1,718 Balance at June 30, 2014 $ 4,803 $ 34,183 Balance at December 31, 2014 $ 3,328 $ 36,338 Change in value 118 748 Amortization — 1,109 Net change in level 3 118 1,857 Balance at June 30, 2015 $ 3,446 $ 38,195
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 six months ended June 30, 2015 and 2014 : June 30, 2015 Total Losses from fair value changes Other real estate owned $ 20,367 $ 757 Impaired loans 41,241 110 Premise and equipment 813 1,089 June 30, 2014 Total Losses from fair value changes Other real estate owned $ 55,443 $ 880 Impaired loans 48,352 1,242 Premise and equipment — —
Table of Valuation Techniques and Unobservable Inputs Used in Valuation of Financial Instruments Falling Within Level 3 of Fair Value Hierarchy	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 June 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 June 30, 2015 Valuation Technique Unobservable Input Quantitative Measures Other securities $ 419 Cash investment in private equity fund Realizable value Impaired loans 41,241 Appraised value Appraised values Discount rate 0-25% Clawback liability 38,195 Contractually defined discounted cash flows Intrinsic loss estimates $323.3 million - Expected credit losses — Discount rate 4% Warrant liability 3,446 Black-Scholes Volatility 21%-28%

Fair Value of Financial Instr44

Fair Value of Financial Instruments - (Tables)	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	June 30, 2015 December 31, 2014 Level in fair value measurement hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value ASSETS: Cash and cash equivalents Level 1 $ 242,441 $ 242,441 $ 256,979 $ 256,979 Securities purchased under agreements to resell Level 2 50,000 50,011 — — Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 357,833 357,833 404,215 404,215 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 958,577 958,577 1,074,580 1,074,580 Other securities Level 3 419 419 419 419 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 374,915 380,054 422,622 428,323 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 97,690 96,465 107,968 106,314 Capital stock of FHLB Level 2 7,361 7,361 7,595 7,595 Capital stock of FRB Level 2 19,689 19,689 19,450 19,450 Loans receivable, net Level 3 2,308,283 2,347,359 2,144,796 2,193,222 Loans held-for-sale Level 2 10,037 10,037 5,146 5,146 Accrued interest receivable Level 2 10,808 10,808 11,465 11,465 Derivatives Level 2 3,786 3,786 1,428 1,428 LIABILITIES: Deposit transaction accounts Level 2 2,494,950 2,494,950 2,409,137 2,409,137 Time deposits Level 2 1,267,539 1,267,539 1,357,051 1,357,885 Securities sold under agreements to repurchase Level 2 187,314 187,314 133,552 133,552 Federal Home Loan Bank advances Level 2 40,000 40,511 40,000 40,465 Due to FDIC Level 3 38,195 38,195 42,011 42,011 Warrant liability Level 3 3,446 3,446 3,328 3,328 Accrued interest payable Level 2 3,650 3,650 3,608 3,608 Derivatives Level 2 3,959 3,959 4,728 4,728

Basis of Presentation - (Detail

Basis of Presentation - (Details) - Jun. 30, 2015 $ in Millions	Total	USD ($)banking_center
Accounting Policies [Abstract]
Number Of Full Service Banking Offices		97
Income tax rate	(106.60%)	154.60%
Income tax expense related to the write-off of deferred tax assets | $		$ 1.7

Investment Securities - (Narrat

Investment Securities - (Narrative) (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015USD ($)securities	Dec. 31, 2014USD ($)securities
Investments Schedule [Abstract]
Number of securities | securities	57	62
Fair value of available-for-sale securities in an unrealized loss position	$ 753,638	$ 845,988
Investment securities total	1,800,000	2,000,000
Available-for-sale securities	1,316,829	1,479,214
Held-to-maturity securities	$ 472,605	$ 530,590
Mortgage-backed securities as percentage of available-for-sale investment portfolio	100.00%	100.00%
Fair value of available-for-sale investment securities pledged as collateral	$ 344,800	$ 274,400
Estimated weighted average life of the available-for-sale mortgage-backed securities portfolio	3 years 8 months 8 days	3 years 5 months 15 days
Fair value of held-to-maturity securities in an unrealized loss position	$ 101,641	$ 110,278
Number of held-to-maturity securities in unrealized loss positions | securities	13	12
Held-to-maturity investment securities pledged as collateral	$ 92,200	$ 88,300
Estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio	3 years 8 months 20 days	3 years 4 months 10 days

Investment Securities - (Summar

Investment Securities - (Summary of Available-for-Sale Investment Securities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,322,112	$ 1,484,497
Gross unrealized gains	14,750	16,478
Gross unrealized losses	(20,033)	(21,761)
Investment securities available-for-sale (at fair value)	1,316,829	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	349,760	395,244
Gross unrealized gains	8,279	9,014
Gross unrealized losses	(206)	(43)
Investment securities available-for-sale (at fair value)	357,833	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	971,933	1,088,834
Gross unrealized gains	6,471	7,464
Gross unrealized losses	(19,827)	(21,718)
Investment securities available-for-sale (at fair value)	958,577	1,074,580
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	419	419
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Investment securities available-for-sale (at fair value)	$ 419	$ 419

Investment Securities - (Summ48

Investment Securities - (Summary of Unrealized Losses) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 176,301	$ 88,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,118)	(2,053)
12 months or more, Fair Value	577,337	757,117
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(17,915)	(19,708)
Total, Fair Value	753,638	845,988
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(20,033)	(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	90,176	17
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(206)	0
12 months or more, Fair Value	0	89,749
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(43)
Total, Fair Value	90,176	89,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(206)	(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	86,125	88,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,912)	(2,053)
12 months or more, Fair Value	577,337	667,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(17,915)	(19,665)
Total, Fair Value	663,462	756,222
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (19,827)	$ (21,718)

Investment Securities - (Summ49

Investment Securities - (Summary of Held-to-maturity Investment Securities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 472,605	$ 530,590
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,633	5,990
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,719)	(1,943)
Fair value	476,519	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	374,915	422,622
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,287	5,773
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(148)	(72)
Fair value	380,054	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	97,690	107,968
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	346	217
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,571)	(1,871)
Fair value	$ 96,465	$ 106,314

Investment Securities - (Summ50

Investment Securities - (Summary of Held-to-Maturity Securities, Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 49,506	$ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	167	0
Fair Value, 12 months or more	52,135	110,278
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,552)	(1,943)
Total Fair Value	101,641	110,278
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,719)	(1,943)
Residential Mortgage Backed Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	30,744	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	112	0
Fair Value, 12 months or more	1,902	35,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(36)	(72)
Total Fair Value	32,646	35,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(148)	(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, Less than 12 months	18,762	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	55	0
Fair Value, 12 months or more	50,233	75,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,516)	(1,871)
Total Fair Value	68,995	75,139
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,571)	$ (1,871)

Loans - Narrative Section (Deta

Loans - Narrative Section (Details) - Financing Receivable, Troubled Debt Restructuring [Domain] $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)SecurityLoan	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)
Debt Instrument [Line Items]
Covered Loans Percentage	7.20%	9.00%
Fees and cost related to loans	$ 8,300	$ 10,500
Carrying amount of loan investments	2,328,524	2,162,409	$ 2,087,831
Energy Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	144,200	161,800
Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	916,726	795,396
Commercial Banking [Member]
Debt Instrument [Line Items]
Loans And Leases Receivable, Tax Exempt	256,400	112,600
Non Accrual [Member]
Debt Instrument [Line Items]
Recorded investment, non-accrual status	15,077	10,813
Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,087,229	1,882,764
Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	895,309	772,440
ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	241,295	279,645
ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	21,417	22,956
Total Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,328,524	2,162,409
Recorded investment, non-accrual status	15,077	10,813
Total Loans [Member] | Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,087,229	1,882,764
Recorded investment, non-accrual status	15,077	10,813
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	895,309	772,440
Recorded investment, non-accrual status	10,311	4,215
Total Loans [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	241,295	279,645
Recorded investment, non-accrual status	0	0
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	21,417	22,956
Recorded investment, non-accrual status	0	0
Total Loans [Member] | Substandard [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	164,011	165,941
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 59,081	39,626
Number of commercial standard loans | SecurityLoan	4
Increase in carrying amount of loan investments	$ 28,000
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]
Debt Instrument [Line Items]
Number of commercial standard loans | SecurityLoan	3
Increase in carrying amount of loan investments	$ 21,300
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	45,234	19,250
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	104,930	126,315
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 10,854	$ 11,092

Loans - Impaired Loans Narrativ

Loans - Impaired Loans Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)SecurityLoan	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 2,328,524	$ 2,162,409	$ 2,087,831
Impaired loans	8,200
Recorded investment of impaired loans	41,241	32,091
Impaired loans which were covered by FDIC loss sharing agreement	$ 167,149	193,697
Number of loans resulting in increase to impaired loans | SecurityLoan	2
Loans impaired in period	$ 12,700
Collective related allowance for loan losses for impaired loans	893	279
Investment in impaired loans not covered by loan loss, current as to principal and interest	6,800
Investment in impaired loans not covered by loan loss, non-accrual status	5,900
Discounted Cash Flows [Member]
Debt Instrument [Line Items]
Impaired loans	10,700
Fair Value Of Collateral Pledged [Member]
Debt Instrument [Line Items]
Impaired loans	22,300
General Reserve [Member]
Debt Instrument [Line Items]
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	$ 916,726	$ 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	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Loans [Line Items]
Total Loans	$ 2,328,524	$ 2,162,409	$ 2,087,831
Loans receivable, net - covered	$ 167,149	$ 193,697
Covered Loans Percentage	7.20%	9.00%
% of Total	100.00%	100.00%
Covered [Member]
Loans [Line Items]
Total Loans		$ 193,697
Non-Covered [Member]
Loans [Line Items]
Total Loans	$ 2,161,375	$ 1,968,712
% of Total	92.80%	91.00%
Commercial Loan [Member]
Loans [Line Items]
Total Loans	$ 916,726	$ 795,396
% of Total	39.40%	36.80%
Agriculture [Member]
Loans [Line Items]
Total Loans	$ 140,954	$ 137,531
% of Total	6.10%	6.40%
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	$ 583,366	$ 561,594
% of Total	25.00%	26.00%
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	$ 654,329	$ 632,700
% of Total	28.10%	29.20%
Consumer [Member]
Loans [Line Items]
Total Loans	$ 33,149	$ 35,188
% of Total	1.40%	1.60%
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	$ 2,087,229	$ 1,882,764
Non ASC 310-30 [Member] | Covered [Member]
Loans [Line Items]
Total Loans	27,899	32,821
Non ASC 310-30 [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	2,059,330	1,849,943
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	895,309	772,440
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	122,468	118,468
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	416,885	369,264
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	623,167	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	29,400	30,653
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	241,295	279,645
ASC 310-30 [Member] | Covered [Member]
Loans [Line Items]
Total Loans	139,250	160,876
ASC 310-30 [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	102,045	118,769
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	21,417	22,956
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	18,486	19,063
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	166,481	192,330
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	31,162	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	$ 3,749	$ 4,535

Loans - (Loan Delinquency) (Det

Loans - (Loan Delinquency) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Loans [Line Items]
Total loans	$ 2,328,524	$ 2,162,409	$ 2,087,831
Commercial Loan [Member]
Loans [Line Items]
Total loans	916,726	795,396
Agriculture [Member]
Loans [Line Items]
Total loans	140,954	137,531
Commercial Real Estate [Member]
Loans [Line Items]
Total loans	583,366	561,594
Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	654,329	632,700
Consumer [Member]
Loans [Line Items]
Total loans	33,149	35,188
Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	2,087,229	1,882,764
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	895,309	772,440
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total loans	122,468	118,468
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	416,885	369,264
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	623,167	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	29,400	30,653
ASC 310-30 [Member]
Loans [Line Items]
Total loans	241,295	279,645
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	21,417	22,956
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total loans	18,486	19,063
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	166,481	192,330
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	31,162	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	3,749	4,535
Covered [Member]
Loans [Line Items]
Total loans		193,697
Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	27,899	32,821
Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total loans	139,250	160,876
Non-Covered [Member]
Loans [Line Items]
Total loans	2,161,375	1,968,712
Non-Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	2,059,330	1,849,943
Non-Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total loans	102,045	118,769
Total Loans [Member]
Loans [Line Items]
30-59 days past due	10,557	4,541
60-89 days past due	569	5,518
Greater than 90 days past due	27,306	35,358
Total past due	38,432	45,417
Current	2,290,092	2,116,992
Total loans	2,328,524	2,162,409
Loans 90 days past due and still accruing	24,876	34,097
Non- accrual	15,077	10,813
Total Loans [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due	8,569	1,442
60-89 days past due	354	1,600
Greater than 90 days past due	2,452	1,523
Total past due	11,375	4,565
Current	2,075,854	1,878,199
Total loans	2,087,229	1,882,764
Loans 90 days past due and still accruing	22	263
Non- accrual	15,077	10,813
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
30-59 days past due	0	0
60-89 days past due	0	0
Greater than 90 days past due	0	0
Total past due	0	0
Current	10,772	11,748
Total loans	10,772	11,748
Loans 90 days past due and still accruing	0	0
Non- accrual	0	0
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
30-59 days past due	0	41
60-89 days past due	0	0
Greater than 90 days past due	0	0
Total past due	0	41
Current	4,001	4,532
Total loans	4,001	4,573
Loans 90 days past due and still accruing	0	0
Non- accrual	0	0
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
30-59 days past due	0	0
60-89 days past due	0	0
Greater than 90 days past due	0	0
Total past due	0	0
Current	17,120	10,856
Total loans	17,120	10,856
Loans 90 days past due and still accruing	0	(1)
Non- accrual	0	0
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
30-59 days past due	0	336
60-89 days past due	0	78
Greater than 90 days past due	113	101
Total past due	113	515
Current	146,396	119,710
Total loans	146,509	120,225
Loans 90 days past due and still accruing	0	0
Non- accrual	726	843
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
30-59 days past due	1,383	158
60-89 days past due	208	0
Greater than 90 days past due	0	222
Total past due	1,591	380
Current	236,892	221,482
Total loans	238,483	221,862
Loans 90 days past due and still accruing	0	0
Non- accrual	49	222
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
30-59 days past due	1,383	535
60-89 days past due	208	78
Greater than 90 days past due	113	323
Total past due	1,704	936
Current	415,181	368,328
Total loans	416,885	369,264
Loans 90 days past due and still accruing	0	(1)
Non- accrual	775	1,065
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
30-59 days past due	653	378
60-89 days past due	0	1,403
Greater than 90 days past due	1,250	732
Total past due	1,903	2,513
Current	568,038	537,022
Total loans	569,941	539,535
Loans 90 days past due and still accruing	0	0
Non- accrual	3,313	4,335
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
30-59 days past due	160	133
60-89 days past due	8	1
Greater than 90 days past due	0	101
Total past due	168	235
Current	53,058	52,169
Total loans	53,226	52,404
Loans 90 days past due and still accruing	0	0
Non- accrual	382	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	3	17
60-89 days past due	0	1,016
Greater than 90 days past due	1,052	152
Total past due	1,055	1,185
Current	26,844	31,636
Total loans	27,899	32,821
Loans 90 days past due and still accruing	0	75
Non- accrual	1,140	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	8,566	1,425
60-89 days past due	354	584
Greater than 90 days past due	1,400	1,371
Total past due	10,320	3,380
Current	2,049,010	1,846,563
Total loans	2,059,330	1,849,943
Loans 90 days past due and still accruing	22	188
Non- accrual	13,937	9,496
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
30-59 days past due	5,998	83
60-89 days past due	134	97
Greater than 90 days past due	1,089	318
Total past due	7,221	498
Current	888,088	771,942
Total loans	895,309	772,440
Loans 90 days past due and still accruing	22	215
Non- accrual	10,311	4,215
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
30-59 days past due	135	47
60-89 days past due	0	0
Greater than 90 days past due	0	10
Total past due	135	57
Current	122,333	118,411
Total loans	122,468	118,468
Loans 90 days past due and still accruing	0	10
Non- accrual	265	495
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
30-59 days past due	813	511
60-89 days past due	8	1,404
Greater than 90 days past due	1,250	833
Total past due	2,071	2,748
Current	621,096	589,191
Total loans	623,167	591,939
Loans 90 days past due and still accruing	0	0
Non- accrual	3,695	4,811
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
30-59 days past due	240	266
60-89 days past due	4	21
Greater than 90 days past due	0	39
Total past due	244	326
Current	29,156	30,327
Total loans	29,400	30,653
Loans 90 days past due and still accruing	0	39
Non- accrual	31	227
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
30-59 days past due	1,988	3,099
60-89 days past due	215	3,918
Greater than 90 days past due	24,854	33,835
Total past due	27,057	40,852
Current	214,238	238,793
Total loans	241,295	279,645
Loans 90 days past due and still accruing	24,854	33,834
Non- accrual	0	0
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
30-59 days past due	418	152
60-89 days past due	70	0
Greater than 90 days past due	742	1,755
Total past due	1,230	1,907
Current	20,187	21,049
Total loans	21,417	22,956
Loans 90 days past due and still accruing	742	1,754
Non- accrual	0	0
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
30-59 days past due	374	0
60-89 days past due	0	0
Greater than 90 days past due	65	367
Total past due	439	367
Current	18,047	18,696
Total loans	18,486	19,063
Loans 90 days past due and still accruing	65	367
Non- accrual	0	0
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
30-59 days past due	884	564
60-89 days past due	145	92
Greater than 90 days past due	21,736	31,013
Total past due	22,765	31,669
Current	143,716	160,661
Total loans	166,481	192,330
Loans 90 days past due and still accruing	21,736	31,013
Non- accrual	0	0
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
30-59 days past due	147	2,014
60-89 days past due	0	3,826
Greater than 90 days past due	2,290	646
Total past due	2,437	6,486
Current	28,725	34,275
Total loans	31,162	40,761
Loans 90 days past due and still accruing	2,290	646
Non- accrual	0	0
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
30-59 days past due	165	369
60-89 days past due	0	0
Greater than 90 days past due	21	54
Total past due	186	423
Current	3,563	4,112
Total loans	3,749	4,535
Loans 90 days past due and still accruing	21	54
Non- accrual	0	0
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	1,197	576
60-89 days past due	0	3,892
Greater than 90 days past due	23,078	31,239
Total past due	24,275	35,707
Current	114,975	125,169
Total loans	139,250	160,876
Loans 90 days past due and still accruing	23,080	31,238
Non- accrual	0	0
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	791	2,523
60-89 days past due	215	26
Greater than 90 days past due	1,776	2,596
Total past due	2,782	5,145
Current	99,263	113,624
Total loans	102,045	118,769
Loans 90 days past due and still accruing	1,774	2,596
Non- accrual	0	0
Total Loans [Member] | Covered [Member]
Loans [Line Items]
30-59 days past due	1,200	593
60-89 days past due	0	4,908
Greater than 90 days past due	24,130	31,391
Total past due	25,330	36,892
Current	141,819	156,805
Total loans	167,149	193,697
Loans 90 days past due and still accruing	23,080	31,313
Non- accrual	1,140	1,317
Total Loans [Member] | Non-Covered [Member]
Loans [Line Items]
30-59 days past due	9,357	3,948
60-89 days past due	569	610
Greater than 90 days past due	3,176	3,967
Total past due	13,102	8,525
Current	2,148,273	1,960,187
Total loans	2,161,375	1,968,712
Loans 90 days past due and still accruing	1,796	2,784
Non- accrual	13,937	9,496
Total Loans [Member] | Covered And Non-covered [Member]
Loans [Line Items]
30-59 days past due	10,557	4,541
60-89 days past due	569	5,518
Greater than 90 days past due	27,306	35,358
Total past due	38,432	45,417
Current	2,290,092	2,116,992
Total loans	2,328,524	2,162,409
Loans 90 days past due and still accruing	24,876	34,097
Non- accrual	15,077	10,813
Non Accrual [Member]
Loans [Line Items]
Non- accrual	15,077	10,813
Non Accrual [Member] | Covered [Member] | ASC 310-30 [Member] | Total Loans [Member]
Loans [Line Items]
Non- accrual	$ 0	$ 0

Loans - (Credit Exposure for Lo

Loans - (Credit Exposure for Loans as Determined by Company's Internal Risk Rating System) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Loans [Line Items]
Total Loans	$ 2,328,524	$ 2,162,409	$ 2,087,831
Agriculture [Member]
Loans [Line Items]
Total Loans	140,954	137,531
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	654,329	632,700
Consumer [Member]
Loans [Line Items]
Total Loans	33,149	35,188
Commercial Loan [Member]
Loans [Line Items]
Total Loans	916,726	795,396
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	583,366	561,594
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,087,229	1,882,764
Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	122,468	118,468
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	623,167	591,939
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	29,400	30,653
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	895,309	772,440
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	416,885	369,264
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	241,295	279,645
ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	18,486	19,063
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	31,162	40,761
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	3,749	4,535
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	21,417	22,956
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	166,481	192,330
Covered [Member]
Loans [Line Items]
Total Loans		193,697
Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	27,899	32,821
Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	139,250	160,876
Non-Covered [Member]
Loans [Line Items]
Total Loans	2,161,375	1,968,712
Non-Covered [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,059,330	1,849,943
Non-Covered [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	102,045	118,769
Total Loans [Member]
Loans [Line Items]
Total Loans	2,328,524	2,162,409
Total Loans [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,087,229	1,882,764
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	10,772	11,748
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	4,001	4,573
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	17,120	10,856
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	146,509	120,225
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	238,483	221,862
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	416,885	369,264
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	122,468	118,468
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	569,941	539,535
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	53,226	52,404
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	623,167	591,939
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	29,400	30,653
Total Loans [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	27,899	32,821
Total Loans [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,059,330	1,849,943
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	895,309	772,440
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	241,295	279,645
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	18,486	19,063
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	31,162	40,761
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	3,749	4,535
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	21,417	22,956
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	166,481	192,330
Total Loans [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]
Loans [Line Items]
Total Loans	139,250	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	102,045	118,769
Total Loans [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,101,933	1,958,078
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	1,980,745	1,814,873
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	10,772	11,748
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	4,001	4,573
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	17,120	10,856
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	142,378	115,178
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	230,394	199,817
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	404,665	342,172
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	109,723	114,642
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	564,946	533,630
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	52,061	51,059
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	617,007	584,689
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	29,369	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	16,594	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	1,964,151	1,793,633
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	819,981	742,944
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	121,188	143,205
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	10,616	16,854
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	23,198	29,069
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	3,241	3,641
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	9,813	11,038
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	74,320	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	39,446	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	81,742	93,349
Total Loans [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	57,654	33,629
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	46,550	28,039
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	149	158
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	4,856	17,607
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	5,005	17,765
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	12,130	85
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	0	23
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	0	23
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	163	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	46,387	27,868
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	29,415	10,166
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	11,104	5,590
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	6,028	30
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	1,211	1,403
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	100	105
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	446	282
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	3,319	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	8,901	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	2,203	2,554
Total Loans [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	164,011	165,941
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	59,081	39,626
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	3,982	4,889
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	3,228	4,430
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	7,210	9,319
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	615	3,741
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	4,826	5,744
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	1,165	1,345
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	5,991	7,089
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	31	227
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	10,994	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	48,087	28,325
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	45,234	19,250
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	104,930	126,315
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	1,842	2,179
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	6,753	10,289
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	408	789
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	10,854	11,092
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	85,073	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	86,830	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	18,100	22,864
Total Loans [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	4,926	4,761
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	853	226
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	5	8
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	5	8
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Sr lien [Member]
Loans [Line Items]
Total Loans	169	138
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	169	138
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]
Loans [Line Items]
Total Loans	148	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	705	117
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	679	80
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	4,073	4,535
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	0	0
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	304	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	4,073	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	0	2
Total Loans [Member] | Covered [Member]
Loans [Line Items]
Total Loans	167,149	193,697
Total Loans [Member] | Covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	56,040	71,096
Total Loans [Member] | Covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	9,064	3,207
Total Loans [Member] | Covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	97,824	114,752
Total Loans [Member] | Covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	4,221	4,642
Total Loans [Member] | Non-Covered [Member]
Loans [Line Items]
Total Loans	2,161,375	1,968,712
Total Loans [Member] | Non-Covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,045,893	1,886,982
Total Loans [Member] | Non-Covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	48,590	30,422
Total Loans [Member] | Non-Covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	66,187	51,189
Total Loans [Member] | Non-Covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	705	119
Total Loans [Member] | Covered And Non-covered [Member]
Loans [Line Items]
Total Loans	2,328,524	2,162,409
Total Loans [Member] | Covered And Non-covered [Member] | Pass [Member]
Loans [Line Items]
Total Loans	2,101,933	1,958,078
Total Loans [Member] | Covered And Non-covered [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	57,654	33,629
Total Loans [Member] | Covered And Non-covered [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	164,011	165,941
Total Loans [Member] | Covered And Non-covered [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	$ 4,926	$ 4,761

Loans - (Additional Information

Loans - (Additional Information Regarding Impaired Loans) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loans [Line Items]
Unpaid principal balance, Total	$ 43,311	$ 34,813
Recorded Investment In Acquired Impaired Loans	41,241	32,091
Loans and Leases Receivable, Allowance	893	279
Commercial Loan [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	28,570	16,953
Recorded investment with no related allowance recorded	28,283	16,771
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	1,678	894
Recorded investment of impaired loans with an allowance recorded	1,502	693
Allowance for loan losses allocated with an allowance recorded	681	82
Agriculture [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	3,065
Recorded investment with no related allowance recorded	0	3,061
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	390	177
Recorded investment of impaired loans with an allowance recorded	362	145
Allowance for loan losses allocated with an allowance recorded	2	0
Commercial Construction [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	0	0
Recorded investment of impaired loans with an allowance recorded	0	0
Allowance for loan losses allocated with an allowance recorded	0	0
Commercial Acquisition/Development [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	0	0
Recorded investment of impaired loans with an allowance recorded	0	0
Allowance for loan losses allocated with an allowance recorded	0	0
Multifamily [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	39	0
Recorded investment of impaired loans with an allowance recorded	38	0
Allowance for loan losses allocated with an allowance recorded	0	0
Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	2,145	1,164
Recorded investment with no related allowance recorded	1,876	970
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	1,238	1,321
Recorded investment of impaired loans with an allowance recorded	918	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	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	922	1,140
Recorded investment of impaired loans with an allowance recorded	846	1,060
Allowance for loan losses allocated with an allowance recorded	6	9
Total Commercial Real Estate [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	2,145	1,164
Recorded investment with no related allowance recorded	1,876	970
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	2,199	2,461
Recorded investment of impaired loans with an allowance recorded	1,802	2,084
Allowance for loan losses allocated with an allowance recorded	8	14
Sr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	349	694
Recorded investment with no related allowance recorded	310	248
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	6,372	7,360
Recorded investment of impaired loans with an allowance recorded	5,760	6,359
Allowance for loan losses allocated with an allowance recorded	193	172
Jr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	1,560	1,768
Recorded investment of impaired loans with an allowance recorded	1,300	1,515
Allowance for loan losses allocated with an allowance recorded	9	9
Residential Real Estate Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	349	694
Recorded investment with no related allowance recorded	310	248
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	7,932	9,128
Recorded investment of impaired loans with an allowance recorded	7,060	7,874
Allowance for loan losses allocated with an allowance recorded	202	181
Consumer [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	0	0
Recorded investment with no related allowance recorded	0	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	48	277
Recorded investment of impaired loans with an allowance recorded	46	245
Allowance for loan losses allocated with an allowance recorded	0	2
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	31,064	21,876
Recorded investment with no related allowance recorded	30,469	21,050
Allowance for loan losses allocated with no related allowance recorded	0	0
Impaired Loans with Related Allowance Recorded [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	12,247	12,937
Recorded investment of impaired loans with an allowance recorded	10,772	11,041
Allowance for loan losses allocated with an allowance recorded	$ 893	$ 279

Loans (Impaired Loans - Average

Loans (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Loans [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 41,968	$ 50,270
Impaired Financing Receivable, Interest Income, Cash Basis Method	528	431
Commercial Loan [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	28,670	25,329
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	357	150
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,549	1,793
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	4
Agriculture [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	9,028
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	108
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	407	171
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	0
Commercial Construction [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Commercial Acquisition/Development [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Multifamily [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	39	874
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,910	1,603
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	35	47
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	960	811
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	13	7
Non Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	473
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	15
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	863	659
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	26	13
Total Commercial Real Estate [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,910	2,076
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	35	62
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,862	2,344
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	39	20
Sr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	315	405
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,880	7,344
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	59	52
Jr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,326	1,540
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	26	30
Residential Real Estate Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	315	405
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,206	8,884
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	85	82
Consumer [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	49	240
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	30,895	36,838
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	401	325
Impaired Loans with Related Allowance Recorded [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,073	13,432
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 127	$ 106

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2015USD ($)SecurityLoan	Jun. 30, 2014USD ($)SecurityLoan	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Accretable yield related for loan pool	$ 103,430	$ 116,095	$ 113,463	$ 130,624
TDR’s modified within the past year that defaulted on their restructured terms | SecurityLoan	0	4
Carrying amount of loan investments	$ 2,328,524	$ 2,087,831	2,162,409
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
Number of restructured loans | SecurityLoan	12
Recorded investment	$ 8,000
Troubled Debt Restructurings [Member] | Non Accrual [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	5,400		7,000
FDIC Covered [Member]
Debt Instrument [Line Items]
Accruing troubled debt restructurings	1,700		9,800
Agriculture and Consumer loans [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 59
Accrual Status [Member]
Debt Instrument [Line Items]
Financing Receivable, Modifications, Subsequent Compliance Recorded Investment	8,800
Recorded investment	15,212		19,275
Covered [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments			193,697
Covered [Member] | Non Accrual Status [Member]
Debt Instrument [Line Items]
Troubled Debt Restructuring Nonaccrual Loans	$ 1,031		$ 1,206

Loans - (Additional Informati59

Loans - (Additional Information Related to Accruing TDR's) (Detail) - Accruing TDR [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Loans [Line Items]
Recorded investment	$ 15,212	$ 19,275
Average year-to- date recorded investment	15,489	19,020
Unpaid principal balance	15,399	19,318
Unfunded commitments to fund TDRs	1,889	377
Commercial [Member]
Loans [Line Items]
Recorded investment	12,635	13,249
Average year-to- date recorded investment	12,870	12,496
Unpaid principal balance	12,765	13,249
Unfunded commitments to fund TDRs	1,887	375
Agriculture [Member]
Loans [Line Items]
Recorded investment	97	2,711
Average year-to- date recorded investment	99	3,110
Unpaid principal balance	101	2,715
Unfunded commitments to fund TDRs	0	0
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	394	610
Average year-to- date recorded investment	399	627
Unpaid principal balance	399	622
Unfunded commitments to fund TDRs	0	0
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	2,071	2,687
Average year-to- date recorded investment	2,105	2,767
Unpaid principal balance	2,119	2,714
Unfunded commitments to fund TDRs	2	2
Consumer [Member]
Loans [Line Items]
Recorded investment	15	18
Average year-to- date recorded investment	16	20
Unpaid principal balance	15	18
Unfunded commitments to fund TDRs	$ 0	$ 0

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	Jun. 30, 2015	Dec. 31, 2014
Covered [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	$ 1,031	$ 1,206
Covered [Member] | Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	0	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	75	94
Covered [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	875	910
Covered [Member] | Consumer [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	0	0
Non-Covered [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	4,355	5,767
Non-Covered [Member] | Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	3,332	3,993
Non-Covered [Member] | Agriculture [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	154	164
Non-Covered [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	300	364
Non-Covered [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR’s	567	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	6 Months Ended
	Jun. 30, 2015	Jun. 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	15,823	18,658
Reclassification to non-accretable difference	(1,390)	(909)
Accretion	(24,466)	(32,278)
Accretable yield ending balance	$ 103,430	$ 116,095

Loans - (Composition of Net Boo

Loans - (Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Contractual cash flows	$ 689,116	$ 751,932
Non-accretable difference	(344,391)	(358,824)
Accretable yield	(103,430)	(113,463)
Loans accounted for under ASC 310-30	$ 241,295	$ 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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 18,873	$ 13,972	$ 17,613	$ 12,521
Provision for loan losses			3,311	3,429
Ending balance	20,241	15,572	20,241	15,572
Total ending allowance balance	18,873	13,972	17,613	12,521	$ 20,241	$ 17,613	$ 15,572
Total Loans					2,328,524	2,162,409	2,087,831
Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	18,102	12,748	16,892	11,241
Charge-offs	(673)	(259)	(1,015)	(836)
Recoveries	197	235	346	496
Provision for loan losses	1,850	1,750	3,253	3,573
Ending balance	19,476	14,474	19,476	14,474
Ending allowance balance individually evaluated for impairment					893		730
Ending allowance balance collectively evaluated for impairment					18,583		13,744
Total ending allowance balance	18,102	12,748	16,892	11,241	19,476	16,892	14,474
Loans individually evaluated for impairment					41,241		48,358
Loans collectively evaluated for impairment					2,045,988		1,681,196
Total Loans					2,087,229	1,882,764
ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	771	1,224	721	1,280
Charge-offs	(14)	(36)	(14)	(38)
Recoveries	0	0	0	0
Provision for loan losses	8	(90)	58	(144)
Ending balance	765	1,098	765	1,098
Ending allowance balance					765		1,098
Total ending allowance balance	771	1,224	721	1,280	765	721	1,098
Loans					241,295		358,277
Total Loans					241,295	279,645
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,920	5,724	8,598	4,258
Ending balance	10,044	6,421	10,044	6,421
Total ending allowance balance	9,920	5,724	8,598	4,258	10,044	8,598	6,421
Total Loans					916,726		686,978
Commercial Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,900	5,581	8,598	4,029
Charge-offs	(1)	(26)	(4)	(412)
Recoveries	26	59	47	117
Provision for loan losses	99	806	1,383	2,686
Ending balance	10,024	6,420	10,024	6,420
Ending allowance balance individually evaluated for impairment					681		147
Ending allowance balance collectively evaluated for impairment					9,343		6,273
Total ending allowance balance	9,900	5,581	8,598	4,029	10,024	8,598	6,420
Loans individually evaluated for impairment					29,785		26,320
Loans collectively evaluated for impairment					865,524		614,814
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	20	143	0	229
Charge-offs	0	0	0	(2)
Recoveries	0	0	0	0
Provision for loan losses	0	(142)	20	(226)
Ending balance	20	1	20	1
Ending allowance balance					20		1
Total ending allowance balance	20	143	0	229	20	0	1
Loans					21,417		45,844
Agriculture [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,151	1,213	1,009	1,237
Ending balance	1,305	1,407	1,305	1,407
Total ending allowance balance	1,151	1,213	1,009	1,237	1,305	1,009	1,407
Total Loans					140,954		160,140
Agriculture [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	551	548	541	572
Charge-offs	0	0	(47)	0
Recoveries	7	0	7	0
Provision for loan losses	135	62	192	38
Ending balance	693	610	693	610
Ending allowance balance individually evaluated for impairment					2		0
Ending allowance balance collectively evaluated for impairment					691		610
Total ending allowance balance	551	548	541	572	693	541	610
Loans individually evaluated for impairment					362		9,121
Loans collectively evaluated for impairment					122,106		128,367
Agriculture [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	600	665	468	665
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	12	132	144	132
Ending balance	612	797	612	797
Ending allowance balance					612		797
Total ending allowance balance	600	665	468	665	612	468	797
Loans					18,486		22,652
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,665	2,213	3,819	2,276
Ending balance	3,830	2,969	3,830	2,969
Total ending allowance balance	3,665	2,213	3,819	2,276	3,830	3,819	2,969
Total Loans					583,366		590,837
Commercial Real Estate Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,528	1,977	3,597	1,984
Charge-offs	(220)	0	(222)	0
Recoveries	109	17	124	54
Provision for loan losses	287	741	205	697
Ending balance	3,704	2,735	3,704	2,735
Ending allowance balance individually evaluated for impairment					8		76
Ending allowance balance collectively evaluated for impairment					3,696		2,659
Total ending allowance balance	3,528	1,977	3,597	1,984	3,704	3,597	2,735
Loans individually evaluated for impairment					3,677		3,548
Loans collectively evaluated for impairment					413,208		348,518
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	137	236	222	292
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	(11)	(2)	(96)	58
Ending balance	126	234	126	234
Ending allowance balance					126		234
Total ending allowance balance	137	236	222	292	126	222	234
Loans					166,481		238,771
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,787	4,234	3,771	4,259
Provision for loan losses	2	1	(26)	(28)
Ending balance	4,649	4,310	4,649	4,310
Total ending allowance balance	3,787	4,234	3,771	4,259	4,649	3,771	4,310
Total Loans					654,329		617,037
Residential Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,787	4,169	3,743	4,165
Charge-offs	(95)	(49)	(177)	(69)
Recoveries	0	85	30	175
Provision for loan losses	955	39	1,051	(27)
Ending balance	4,647	4,244	4,647	4,244
Ending allowance balance individually evaluated for impairment					202		504
Ending allowance balance collectively evaluated for impairment					4,445		3,740
Total ending allowance balance	3,787	4,169	3,743	4,165	4,647	3,743	4,244
Loans individually evaluated for impairment					7,371		9,137
Loans collectively evaluated for impairment					615,796		562,428
Residential Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	65	28	94
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	2	66	2	66
Ending allowance balance					2		66
Total ending allowance balance	0	65	28	94	2	28	66
Loans					31,162		45,472
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	350	588	416	491
Ending balance	413	465	413	465
Total ending allowance balance	350	588	416	491	413	416	465
Total Loans					33,149		32,839
Consumer Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	336	473	413	491
Charge-offs	(357)	(184)	(565)	(355)
Recoveries	55	74	138	150
Provision for loan losses	374	102	422	179
Ending balance	408	465	408	465
Ending allowance balance individually evaluated for impairment					0		3
Ending allowance balance collectively evaluated for impairment					408		462
Total ending allowance balance	336	473	413	491	408	413	465
Loans individually evaluated for impairment					46		232
Loans collectively evaluated for impairment					29,354		27,069
Consumer Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14	115	3	0
Charge-offs	(14)	(36)	(14)	(36)
Recoveries	0	0	0	0
Provision for loan losses	5	(79)	16	(36)
Ending balance	5	0	5	0
Ending allowance balance					5		0
Total ending allowance balance	$ 14	$ 115	$ 3	$ 0	5	$ 3	0
Loans					$ 3,749		$ 5,538

Allowance for Loan Losses - (Na

Allowance for Loan Losses - (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses			$ (3,311)	$ (3,429)
Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Allowance for Loan and Lease Losses Write-offs, Net	$ (500)	$ 0	(700)	(300)
Provision for loan losses	(1,850)	(1,750)	(3,253)	(3,573)
ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(8)	90	(58)	144
Commercial Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(99)	(806)	(1,383)	(2,686)
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	0	142	(20)	226
Residential Portfolio Segment [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(2)	(1)	26	28
Residential Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(955)	(39)	(1,051)	27
Consumer Loan [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(374)	(102)	(422)	(179)
Consumer Loan [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(5)	79	(16)	36
Agriculture [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(135)	(62)	(192)	(38)
Agriculture [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(12)	(132)	(144)	(132)
Commercial Real Estate Portfolio Segment [Member] | Non ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	(287)	(741)	(205)	(697)
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses	$ 11	$ 2	$ 96	$ (58)

FDIC Indemnification Asset - (S

FDIC Indemnification Asset - (Summary of Activity Related to FDIC Indemnification Asset) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period			$ 39,082	$ 64,447
Amortization	$ (7,283)	$ (5,959)	(14,953)	(13,567)
FDIC portion of recoveries exceeding fair value marks			(3,409)	(458)
Change in carrying value of indemnification asset due to loss share submissions			2,495	987
Balance at end of period	$ 23,215	$ 51,409	$ 23,215	$ 51,409

FDIC Indemnification Asset - (N

FDIC Indemnification Asset - (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Banking and Thrift [Abstract]
Amortization	$ (7,283)	$ (5,959)	$ (14,953)	$ (13,567)
Decrease in carrying value of FDIC indemnification asset			(2,495)	(987)
Payments/receipts to/from FDIC related to loss share assets			$ 2,500	$ 987

Other Real Estate Owned - (Summ

Other Real Estate Owned - (Summary of Activity in OREO Balances) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Other Real Estate [Roll Forward]
Balance	$ 29,120	$ 70,125
Transfers from loan portfolio, at fair value	920	1,477
Impairments	(757)	(880)
Sales	(11,019)	(16,307)
Gain on sale of OREO, net	2,103	1,028
Balance	$ 20,367	$ 55,443

Other Real Estate Owned - (Narr

Other Real Estate Owned - (Narrative) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
OREO balance	$ 20,367	$ 29,120	$ 55,443	$ 70,125
Minority interests in OREO which are held by outside banks	$ 6,500	$ 8,100
Percentage covered by the loss sharing agreements with the FDIC	65.80%	63.40%
Amount covered by the loss sharing agreements with the FDIC	$ 13,400	$ 18,500

Borrowings (Narrative) (Detail)

Borrowings (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Interest expense related to FHLB advances	$ 166	$ 330
FHLB advances	$ 40,000	$ 40,000	$ 40,000

Borrowings (Federal Home Loan B

Borrowings (Federal Home Loan Bank, Advances) (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
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	Jun. 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%
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	13.50%	15.00%
Common equity risk-based ratio	24.00%
Risk-based capital Ratio	24.00%	28.90%
Total risk-based capital Ratio	24.80%	29.60%
Leverage Amount	$ 648,508	$ 712,222
Common equity risk-based amount	648,508
Risk-based capital amount	648,508	712,222
Total risk-based capital Amount	$ 669,000	$ 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	$ 312,011
Required to be considered well capitalized risk-based capital Amount	215,999	$ 147,796
Required to be considered well capitalized Total risk-based capital Amount	$ 269,998	$ 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	$ 192,007	$ 190,148
Required to be considered adequately capitalized common equity capital amount	216,008
Required to be considered adequately capitalized risk-based capital Amount	161,999	98,530
Required to be considered adequately capitalized Total risk-based capital Amount	$ 215,999	$ 197,061
NBH Bank, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	11.30%	12.10%
Common equity risk-based ratio	20.10%
Risk-based capital Ratio	20.10%	23.50%
Total risk-based capital Ratio	20.90%	24.20%
Leverage Amount	$ 538,878	$ 573,934
Common equity risk-based amount	538,878
Risk-based capital amount	538,878	573,934
Total risk-based capital Amount	$ 559,369	$ 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	$ 478,176	$ 473,478
Required to be considered well capitalized common equity capital amount	310,815
Required to be considered well capitalized risk-based capital Amount	295,069	268,855
Required to be considered well capitalized Total risk-based capital Amount	$ 321,894	$ 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	$ 191,270	$ 189,391
Required to be considered adequately capitalized common equity capital amount	215,179
Required to be considered adequately capitalized risk-based capital Amount	160,947	97,766
Required to be considered adequately capitalized Total risk-based capital Amount	$ 214,596	$ 195,531

Regulatory Capital - (Narrative

Regulatory Capital - (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 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%
NBH Bank, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital Ratio		20.90%	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%
Approval from bank regulators to permanently reduce capital	$ 50
Cash dividends paid		$ 50
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-based capital computations		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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Banking and Thrift [Abstract]
Clawback liability amortization	$ (380)	$ (336)	$ (748)	$ (664)
Clawback liability remeasurement	(2)	(538)	(1,109)	(1,054)
Reimbursement to FDIC for gain on sale of and income from covered OREO	(315)	(782)	(987)	(1,700)
Reimbursement to FDIC for recoveries	(10)	(33)	(18)	(118)
FDIC reimbursement of covered asset resolution costs	1,845	1,040	3,190	1,930
Total	$ 1,138	$ (649)	$ 328	$ (1,606)

Stock-based Compensation and 74

Stock-based Compensation and Employee Benefits - (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	5,074,473		5,074,473
Grants After Plan Effective Date [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [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 Option or Stock Appreciation Right Granted			1
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
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 0.2	$ 0.3	$ 0.3	$ 0.6
Unrecognized compensation expense	1		$ 1
Unrecognized compensation cost, weighted-average period, years			2 years 3 months 26 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	0.7	$ 0.6	$ 1.2	$ 1
Unrecognized compensation expense	$ 3.6		$ 3.6
Unrecognized compensation cost, weighted-average period, years			2 years 4 months 24 days

Stock-based Compensation and 75

Stock-based Compensation and Employee Benefits - (Summary of Option Activity) (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 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	136,903
Forfeited, Options	(23,493)
Surrendered, Options	(130,841)
Exercised, Options	(12,359)
Expired, Options	(508,500)
Outstanding Options, ending	3,058,821	3,597,111
Outstanding, Weighted Average Exercise Price, beginning	$ 19.90
Granted, Weighted Average Exercise Price	19.09
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
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	5 years 1 month 6 days	4 years 5 months 16 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	5 years 1 month 6 days	4 years 5 months 16 days
Outstanding, Aggregate Intrinsic Value, beginning	$ 223,211
Outstanding, Aggregate Intrinsic Value, ending	$ 2,963,912	$ 223,211
Options fully vested and exercisable at September 30, 2014, Options	2,715,711
Options expected to vest, Options	330,763
Options fully vested and exercisable at September 30, 2014, Weighted Average Exercise Price	$ 19.98
Options expected to vest, Weighted Average Exercise Price	$ 18.94
Options fully vested and exercisable at September 30, 2014, weighted average remaining contractual term in years	4 years 7 months 10 days
Options expected to vest, Weighted Average Remaining Contractual Term in Years	8 years 8 months 1 day
Aggregate intrinsic Value of Options fully vested and exercisable at September 30, 2014	$ 0
Options expected to vest, Aggregate Intrinsic Value	$ 2,810,087

Stock-based Compensation and 76

Stock-based Compensation and Employee Benefits - (Summary of Restricted Stock Activity) (Details) - 6 months ended Jun. 30, 2015 - Restricted Stock [Member] - Common Class A [Member] - $ / shares	Total
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)	(50,720)
Unvested Restricted Shares, Granted (in shares)	165,658
Unvested Restricted Shares, Forfeited (in shares)	(8,346)
Unvested Restricted Shares, Surrendered (in shares)	(18,762)
Unvested Restricted Shares, Ending (in shares)	1,043,228
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)	$ 15.16
Weighted Average Grant-Date Fair Value, Vested (in dollars per share)	18.80
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	19.13
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share)	18.64
Weighted Average Grant-Date, Fair Value, Surrendered (in dollars per share)	18.77
Weighted Average Grant-Date Fair Value, Ending (in dollars per share)	$ 15.58

Warrants (Narrative) (Detail)

Warrants (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Summary Activity In Gold Bullion [Line Items]
Outstanding warrants	830,750	830,750	830,750	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	$ 3,400		$ 3,400		$ 3,300
Gain (loss) from the change in fair value of warrant liability	$ 508	$ (580)	$ 118	$ (1,478)
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			Sep. 30, 2020

Warrants (Schedule of Fair Valu

Warrants (Schedule of Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model) (Detail) - Warrant [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Warrant Fair Value Black Scholes Method [Line Items]
Risk-free interest rate	1.53%	1.67%
Expected volatility	21.04%	24.18%
Dividend yield	0.96%	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	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Feb. 11, 2015	Oct. 21, 2014
Schedule Of Common Stock [Line Items]
Repurchase of shares		$ 72,338	$ 45,968
Shares outstanding	35,053,339	35,053,339		38,884,953
Restricted issued but not yet vested, shares		1,043,228		955,398
Common Class A [Member]
Schedule Of Common Stock [Line Items]
Shares outstanding	35,053,339	35,053,339		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)	1,807,507	3,894,673
Repurchase of shares	$ 34,700	$ 72,300
Shares repurchased (weighted average cost per share)	$ 19.16	$ 18.55

Income Per Share - (Narrative)

Income Per Share - (Narrative) (Detail) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Shares outstanding	35,053,339	35,053,339	42,637,687
Outstanding stock options to purchase common stock	3,058,821	3,058,821	3,616,871	3,597,111
Outstanding stock options to purchase common stock, per share	$ 19.86	$ 19.86	$ 19.89	$ 19.90
Outstanding warrants	830,750	830,750	830,750	830,750
Warrants granted, exercise price per share	$ 20	$ 20	$ 20	$ 20
Restricted shares outstanding		1,043,228	1,149,014
Dilutive equity awards (shares)	630	276

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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ (1,341)	$ 2,129	$ (95)	$ 3,560
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0	(11)	0	(17)
Income available to common stockholders (numerator)	$ (1,341)	$ 2,118	$ (95)	$ 3,543
Weighted average common shares outstanding (denominator)	36,164,617	43,868,164	37,091,412	44,341,276
Weighted average shares outstanding for diluted earnings per common share	36,164,617	43,880,263	37,091,412	44,364,639
Income per share—basic (in dollars per share)	$ (0.04)	$ 0.05	$ 0	$ 0.08
Income per share—diluted (in dollars per share)	$ (0.04)	$ 0.05	$ 0	$ 0.08
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities	0	12,099	0	23,363

Derivatives - (FV of Derivative

Derivatives - (FV of Derivatives on the Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	$ 2,372	$ 10
Liability Derivatives	2,464	3,206
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	1,414	1,418
Liability Derivatives	1,495	1,522
Other assets [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	2,372	10
Other assets [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Derivatives	1,414	1,418
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability Derivatives	2,464	3,206
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability Derivatives	$ 1,495	$ 1,522

Derivatives - (Narrative) (Deta

Derivatives - (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)Swap	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)Swap	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)Swap
Derivative [Line Items]
Termination value of derivatives in net liability position	$ 2,600,000		$ 2,600,000
Collateral Already Posted, Aggregate Fair Value	$ 3,100,000		$ 3,100,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swaps held | Swap	13		13		11
Notional amount	$ 51,000,000		$ 51,000,000		$ 35,900,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) related to hedge ineffectiveness	$ (405,000)	$ (67,000)	$ (266,000)	$ (140,000)
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swaps held | Swap	23		23		11
Notional amount	$ 199,858,000		$ 199,858,000		$ 68,800,000

Derivatives - (Derivatives on t

Derivatives - (Derivatives on the Income Statement) (Details) - Interest rate products [Member] - Fair Value Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 5,256	$ (721)	$ 3,104	$ (1,335)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	(4,851)	655	(2,839)	1,195
Designated as Hedging Instrument [Member] | Interest income [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	5,256	(721)	3,104	(1,335)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	(4,851)	655	(2,839)	1,195
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	65	(37)	26	(51)
Not Designated as Hedging Instrument [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 65	$ (37)	$ 26	$ (51)

Commitments and Contingencies85

Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Loan commitments	$ 463,200	$ 485,500
Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Standby letters of credit	$ 9,401	$ 9,965

Commitments and Contingencies86

Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	$ 4,319	$ 7,890
Unfunded commitment not covered under the FDIC loss sharing agreement	468,313	487,567
Total Unfunded Loan Commitments	472,632	495,457
Credit Card Lines of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	0	0
Unfunded commitment not covered under the FDIC loss sharing agreement	16,712	18,065
Total Unfunded Loan Commitments	16,712	18,065
Unfunded Commitments Under Lines of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	4,248	7,645
Unfunded commitment not covered under the FDIC loss sharing agreement	209,282	215,305
Total Unfunded Loan Commitments	213,530	222,950
Commercial and Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	71	234
Unfunded commitment not covered under the FDIC loss sharing agreement	9,330	9,731
Commitments to Fund Loans [Member] | Residential [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	0	0
Unfunded commitment not covered under the FDIC loss sharing agreement	1,748	1,683
Total Unfunded Loan Commitments	1,748	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	0	11
Unfunded commitment not covered under the FDIC loss sharing agreement	184,563	202,593
Total Unfunded Loan Commitments	184,563	202,604
Commitments to Fund Loans [Member] | Construction and Land Development [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	0	0
Unfunded commitment not covered under the FDIC loss sharing agreement	42,368	35,814
Total Unfunded Loan Commitments	42,368	35,814
Commitments to Fund Loans [Member] | Consumer [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment covered under the FDIC loss sharing agreement	0	0
Unfunded commitment not covered under the FDIC loss sharing agreement	4,310	4,376
Total Unfunded Loan Commitments	4,310	4,376
Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Standby letters of credit	$ 9,401	$ 9,965

Fair Value Measurements - (Ta87

Fair Value Measurements - (Tables of Financial Instruments Measured At Fair Value on Recurring Basis) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 1,320,615	$ 1,480,642
Total liabilities at fair value	45,600	44,394
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	419	419
Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	3,786	1,428
Total liabilities at fair value	3,959	4,728
Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	3,446	3,328
Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	38,195	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	357,833	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	958,577	1,074,580
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Total liabilities at fair value	0	0
Level 1 [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Level 1 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Total liabilities at fair value	0	0
Level 1 [Member] | Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	0	0
Level 1 [Member] | Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	0	0
Level 1 [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	0	0
Level 1 [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	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,320,196	1,480,223
Total liabilities at fair value	3,959	4,728
Level 2 [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Level 2 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	3,786	1,428
Total liabilities at fair value	3,959	4,728
Level 2 [Member] | Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	0	0
Level 2 [Member] | Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	0	0
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	357,833	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	958,577	1,074,580
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	419	419
Total liabilities at fair value	41,641	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	419	419
Level 3 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Total liabilities at fair value	0	0
Level 3 [Member] | Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	3,446	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	38,195	36,338
Level 3 [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	0	0
Level 3 [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	$ 0	$ 0

Fair Value Measurements - (Ta88

Fair Value Measurements - (Table of Changes in Level 3 Financial Instruments) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 3,328	$ 6,281
Change in value	118	(1,478)
Amortization	0	0
Net change in level 3	118	(1,478)
Ending Balance	3,446	4,803
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	748	1,054
Amortization	1,109	664
Net change in level 3	1,857	1,718
Ending Balance	$ 38,195	$ 34,183

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)SecurityLoanCompany	Jun. 30, 2014USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of comparable companies for expected volatility | Company	8
Measuring period for payments to the FDIC	45 days
Number of Loans measured | SecurityLoan	6
Nonrecurring Loans Reserves	$ 900
Additions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Loans measured | SecurityLoan	3
Nonrecurring Loans Reserves	$ 700
Nonrecurring Loans Carrying value	$ 1,800
Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Loans measured | SecurityLoan	3
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	$ 600
Percentage of OREO impairments covered by the FDIC	65.50%	65.10%
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses from change in fair value	$ 757	$ 880
Fair value of assets on a non-recurring basis	20,367	55,443
Collateral Dependent Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses from change in fair value	110	1,242
Fair value of assets on a non-recurring basis	41,241	48,352
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	0
Fair value of assets on a non-recurring basis	$ 813	$ 0

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	6 Months Ended
	Jun. 30, 2015	Jun. 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	$ 20,367	$ 55,443
Losses From Fair Value Changes	757	880
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	41,241	48,352
Losses From Fair Value Changes	110	1,242
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	0
Losses From Fair Value Changes	$ 1,089	$ 0

Fair Value Measurements - (Ta91

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 ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	$ 1,320,615,000	$ 1,480,642,000
Total liabilities at fair value	45,600,000	$ 44,394,000
Other Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	419,000
Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total liabilities at fair value	41,241,000
Clawback Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total liabilities at fair value	38,195,000
Warrant Liability [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total liabilities at fair value	$ 3,446,000
Discounted Cash Flows [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	4.00%
Minimum [Member] | Appraised value [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	0.00%
Minimum [Member] | Contractually Defined [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intrinsic loss estimates	$ 323,300,000
Minimum [Member] | Black-Scholes [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Volatility	21.00%
Maximum [Member] | Appraised value [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	25.00%
Maximum [Member] | Contractually Defined [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intrinsic loss estimates	$ 405,000,000
Maximum [Member] | Black-Scholes [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Volatility	28.00%

Fair Value of Financial Instr92

Fair Value of Financial Instruments - (Schedule of Fair Value of Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
ASSETS:
Cash and cash equivalents	$ 242,441	$ 256,979	$ 173,059	$ 189,460
Securities Purchased under Agreements to Resell	50,000	0
Investment securities available-for-sale (at fair value)	1,316,829	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	472,605	530,590
Loans held-for-sale	10,037	5,146
LIABILITIES:
Time deposits	1,267,539	1,357,051
Securities sold under agreements to repurchase	187,314	133,552
Advances from Federal Home Loan Banks	40,000	40,000
Due to FDIC	38,195	42,011
Warrant liability	3,400	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)	357,833	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	374,915	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)	958,577	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	97,690	107,968
Other Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	419	419
Carrying Amount [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	242,441	256,979
Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Securities Purchased under Agreements to Resell	50,000	0
Capital stock of FHLB	7,361	7,595
Capital stock of FRB	19,689	19,450
Loans held-for-sale	10,037	5,146
Accrued interest receivable	10,808	11,465
Derivative asset	3,786	1,428
LIABILITIES:
Deposit transaction accounts	2,494,950	2,409,137
Time deposits	1,267,539	1,357,051
Securities sold under agreements to repurchase	187,314	133,552
Advances from Federal Home Loan Banks	40,000	40,000
Accrued interest payable	3,650	3,608
Derivative liability	3,959	4,728
Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	2,308,283	2,144,796
LIABILITIES:
Due to FDIC	38,195	42,011
Warrant liability	3,446	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)	357,833	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	374,915	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)	958,577	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	97,690	107,968
Carrying Amount [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	419	419
Estimated Fair Value [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	242,441	256,979
Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Securities Purchased under Agreements to Resell	50,011	0
Capital stock of FHLB	7,361	7,595
Capital stock of FRB	19,689	19,450
Loans held-for-sale	10,037	5,146
Accrued interest receivable	10,808	11,465
Derivative asset	3,786	1,428
LIABILITIES:
Deposit transaction accounts	2,494,950	2,409,137
Time deposits	1,267,539	1,357,885
Securities sold under agreements to repurchase	187,314	133,552
Advances from Federal Home Loan Banks	40,511	40,465
Accrued interest payable	3,650	3,608
Derivative liability	3,959	4,728
Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	2,347,359	2,193,222
LIABILITIES:
Due to FDIC	38,195	42,011
Warrant liability	3,446	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)	357,833	404,215
Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	380,054	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)	958,577	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	96,465	106,314
Estimated Fair Value [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	$ 419	$ 419

Fair Value of Financial Instr93

Fair Value of Financial Instruments - (Additional Information) (Detail)	6 Months Ended
	Jun. 30, 2015
Fair Value Of Financial Instruments [Abstract]
Residential mortgage loans held for sale period	45 days

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	Aug. 01, 2015	Jul. 06, 2015	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Shares outstanding				35,053,339	35,053,339	38,884,953
Subsequent Event [Member]
Subsequent Event [Line Items]
Fair market value adjustments of banking centers held-for-sale				$ 1,100,000	$ 1,100,000
Capital Reduction			$ 36,000,000
Payments of capital distribution			$ 36,000,000
Tier 1 leverage ratio			10.50%
Common Class A [Member]
Subsequent Event [Line Items]
Shares outstanding				35,053,339	35,053,339	38,017,179
Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchase, authorized amount		$ 100,000,000
Shares repurchased, price per share		$ 21.50
Shares repurchased		4,651,162
Cash paid for repurchase of shares, net		$ 100,000,000
Shares outstanding		30,404,200
Shares issued, not yet vested		1,037,564
Minimum [Member] | Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares repurchased, price per share		$ 19.60
Maximum [Member] | Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares repurchased, price per share		$ 22.50
Pine River Bank Corporation [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Cash paid for acquisition	$ 9,500,000
Assets acquired	140,300,000
Loans acquired	65,200,000
Deposits acquired	130,200,000
Capital acquired	$ 8,900,000