National Bank (NBHC) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 06, 2014	Nov. 06, 2014
		Common Class A [Member]	Common Class B [Member]
Entity Information [Line Items]	'	'	'
Document Type	'10-Q	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Sep-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'Q3	'	'
Trading Symbol	'NBHC	'	'
Entity Registrant Name	'National Bank Holdings Corp	'	'
Entity Central Index Key	'0001475841	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	38,922,279	867,774

Consolidated_Statements_of_Fin

Consolidated Statements of Financial Condition (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks	$58,525	$67,420
Due from Federal Reserve Bank of Kansas City	50,092	107,894
Interest bearing bank deposits	10,042	14,146
Cash and cash equivalents	118,659	189,460
Investment securities available-for-sale (at fair value)	1,553,641	1,785,528
Investment securities held-to-maturity (fair value of $557,593 and $636,405 at September 30, 2014 and December 31, 2013, respectively)	557,464	641,907
Non-marketable securities	21,640	31,663
Loans (including covered loans of $219,468 and $309,397 at September 30, 2014 and December 31, 2013, respectively)	2,171,372	1,854,094
Allowance for loan losses	-16,591	-12,521
Loans, net	2,154,781	1,841,573
Loans held for sale	5,252	5,787
Federal Deposit Insurance Corporation (bFDICb) indemnification asset, net	44,413	64,447
Other real estate owned	45,885	70,125
Premises and equipment, net	108,100	115,219
Goodwill	59,630	59,630
Intangible assets, net	18,220	22,229
Other assets	125,122	86,547
Total assets	4,812,807	4,914,115
Liabilities:	'	'
Non-interest bearing demand deposits	724,186	674,989
Interest bearing demand deposits	369,917	386,762
Savings and money market	1,307,285	1,280,871
Time deposits	1,396,070	1,495,687
Total deposits	3,797,458	3,838,309
Securities sold under agreements to repurchase	109,946	99,547
Due to FDIC	35,120	41,882
Other liabilities	61,321	36,585
Total liabilities	4,003,845	4,016,323
Shareholdersb equity:	'	'
Common stock, par value $0.01 per share: 400,000,000 shares authorized; 52,405,241 and 52,289,347 shares issued; 39,862,824 and 44,918,336 shares outstanding at September 30, 2014 and December 31, 2013, respectively	512	512
Additional paid in capital	992,587	990,216
Retained earnings	40,197	39,966
Treasury stock of 11,392,009 and 6,306,551 shares at September 30, 2014 and December 31, 2013, respectively, at cost	-226,230	-126,146
Accumulated other comprehensive income (loss), net of tax	1,896	-6,756
Total shareholdersb equity	808,962	897,792
Total liabilities and shareholdersb equity	$4,812,807	$4,914,115

Consolidated_Statements_of_Fin1

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Investment securities held-to-maturity, fair value	$557,593	$636,405
Loans receivable, net - covered	'	$309,397
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	52,405,241	52,289,347
Common Stock, shares outstanding	39,862,824	44,918,336
Treasury stock, shares	11,392,009	6,306,551

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest and dividend income:	'	'	'	'
Interest and fees on loans	$33,403	$35,328	$99,704	$105,783
Interest and dividends on investment securities	11,749	13,539	37,523	40,383
Dividends on non-marketable securities	245	388	904	1,170
Interest on interest-bearing bank deposits	95	267	251	762
Total interest and dividend income	45,492	49,522	138,382	148,098
Interest expense:	'	'	'	'
Interest on deposits	3,563	3,965	10,625	12,647
Interest on borrowings	34	42	92	80
Total interest expense	3,597	4,007	10,717	12,727
Net interest income before provision for loan losses	41,895	45,515	127,665	135,371
Provision for loan losses	1,515	437	4,944	3,524
Net interest income after provision for loan losses	40,380	45,078	122,721	131,847
Non-interest income:	'	'	'	'
FDIC indemnification asset amortization	-6,252	-4,208	-19,819	-11,843
FDIC loss sharing (expense) income	-943	-1,191	-2,549	3,278
Service charges	4,148	4,334	11,558	11,944
Bank card fees	2,615	2,482	7,548	7,509
Gain on sales of mortgages, net	264	345	674	1,125
Gain on previously charged-off acquired loans	147	224	675	1,118
Other real estate owned related write-ups and other income	799	727	2,777	2,713
Other non-interest income	836	625	2,557	1,969
Total non-interest income	1,614	3,338	3,421	17,813
Non-interest expense:	'	'	'	'
Salaries and benefits	21,058	22,639	62,260	69,363
Occupancy and equipment	6,155	6,556	18,838	18,391
Telecommunications and data processing	2,848	3,050	8,978	9,805
Marketing and business development	757	1,408	3,542	3,519
FDIC deposit insurance	1,029	1,021	3,109	3,074
ATM/debit card expenses	799	1,179	2,312	3,291
Professional fees	854	791	2,180	3,045
Other non-interest expense	2,540	3,210	7,698	9,667
Gain (loss) from the change in fair value of warrant liability	-1,256	441	-2,734	138
Intangible asset amortization	1,336	1,336	4,008	4,009
Other real estate owned expenses	594	459	3,629	7,675
Problem loan expenses	1,267	1,134	3,034	4,361
Banking center closure related expenses	0	3,389	0	3,389
Total non-interest expense	37,981	46,613	116,854	139,727
Income before income taxes	4,013	1,803	9,288	9,933
Income tax expense	676	856	2,391	4,006
Net income	$3,337	$947	$6,897	$5,927
Income per sharebbasic (in dollars per share)	$0.08	$0.02	$0.16	$0.11
Income per sharebdiluted (in dollars per share)	$0.08	$0.02	$0.16	$0.11
Weighted average number of common shares outstanding:	'	'	'	'
Basic (Shares)	41,837,485	51,454,200	43,403,791	51,940,245
Diluted (Shares)	41,841,685	51,501,980	43,423,273	51,973,161

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$3,337	$947	$6,897	$5,927
Other comprehensive income, net of tax:	'	'	'	'
Net unrealized gains (losses) arising during the period, net of tax benefit of $1,480 and $5,141 for the three months ended September 30, 2014 and 2013, respectively; and net of tax (expense) benefit of ($6,824) and $22,852 for the nine months ended September 30, 2014 and 2013, respectively.	-2,407	-8,214	11,099	-36,015
Securities available for sale, net	-2,407	-8,214	11,099	-36,015
Net unrealized holding gains on securities transferred between available-for-sale to held-to-maturity:	'	'	'	'
Less: amortization of net unrealized holding gains to income, net of tax benefit of $475 and $738 for the three months ended September 30, 2014 and 2013, respectively; and net of tax benefit of $1,505 and $2,943 for the nine months ended September 30, 2014 and 2013, respectively.	-774	-1,178	-2,447	-4,700
Other comprehensive income, net	-774	-1,178	-2,447	-4,700
Other comprehensive income (loss)	-3,181	-9,392	8,652	-40,715
Comprehensive income (loss)	$156	($8,445)	$15,549	($34,788)

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Tax (expense) benefit on net unrealized gains (losses) arising during the period	$1,480	$5,141	($6,824)	$22,852
Tax benefit of amortization of net unrealized holding gains to income	$475	$738	$1,505	$2,943

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income, net [Member]
In Thousands, unless otherwise specified
Balance in the beginning at Dec. 31, 2012	$1,090,559	$523	$1,006,194	$43,273	($4)	$40,573
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	5,927	0	0	5,927	0	0
Stock-based compensation	4,003	0	4,003	0	0	0
Repurchase of shares	-20,590	-11	-20,583	0	4	0
Dividends paid ($.15 per share)	-7,934	0	0	-7,934	0	0
Other comprehensive income	-40,715	0	0	0	0	-40,715
Balance in the ending at Sep. 30, 2013	1,031,250	512	989,614	41,266	0	-142
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	6,897	0	0	6,897	0	0
Stock-based compensation	2,750	0	2,750	0	0	0
Issuance under equity compensation plan	-368	0	-368	0	0	0
Change in corporate tax benefit related to stock-based compensation	-11	0	-11	0	0	0
Repurchase of shares	-100,084	0	0	0	-100,084	0
Dividends paid ($.15 per share)	-6,666	0	0	-6,666	0	0
Other comprehensive income	8,652	0	0	0	0	8,652
Balance in the ending at Sep. 30, 2014	$808,962	$512	$992,587	$40,197	($226,230)	$1,896

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'
Dividends paid per share	$0.15	$0.15
Common Stock Purchased	5,085,458	1,114,628
Treasury Stock, Shares, Retired	0	1,114,868

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net income	$6,897,000	$5,927,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'	'
Provision for loan losses	4,944,000	3,524,000
Depreciation and amortization	12,144,000	11,698,000
Current income tax receivable	20,364,000	-11,249,000
Deferred income tax asset	-18,445,000	-10,848,000
Discount accretion, net of premium amortization on securities	3,828,000	6,692,000
Loan accretion	-48,978,000	-66,906,000
Net gain on sale of mortgage loans	-674,000	-1,125,000
Origination of loans held for sale, net of repayments	-29,622,000	-47,754,000
Proceeds from sales of loans held for sale	30,106,000	47,832,000
Amortization of indemnification asset	19,819,000	11,843,000
Gain on the sale of other real estate owned, net	-2,686,000	-7,384,000
Impairment on other real estate owned	1,789,000	9,142,000
Impairment on fixed assets related to banking center closures	0	2,531,000
Gain on sale of fixed assets	-123,000	0
Stock-based compensation	2,750,000	4,003,000
(Decrease) increase in due to FDIC, net	-6,762,000	693,000
(Increase) decrease in other assets	-740,000	1,739,000
Increase in other liabilities	19,525,000	1,338,000
Net cash provided by (used in) operating activities	14,136,000	-38,304,000
Cash flows from investing activities:	'	'
Proceeds from redemption of FHLB stock	633,000	1,271,000
Proceeds from redemption of FRB stock	9,390,000	0
Maturities of investment securities held-to-maturity	80,052,000	149,991,000
Maturities of investment securities available-for-sale	246,422,000	456,122,000
Purchase of investment securities held-to-maturity	0	-244,502,000
Purchase of investment securities available-for-sale	0	-693,977,000
Increase in securities purchased under agreements to resell	0	-75,000,000
Net (increase) decrease in loans	-274,575,000	91,068,000
Purchase of premises and equipment, net	-894,000	-6,069,000
Purchase of bank-owned life insurance	-40,000,000	0
Proceeds from sales of loans	3,607,000	26,984,000
Proceeds from sales of other real estate owned	27,656,000	54,705,000
Increase in FDIC indemnification asset	215,000	72,634,000
Net cash provided by (used in) investing activities	52,506,000	-166,773,000
Cash flows from financing activities:	'	'
Net decrease in deposits	-40,851,000	-249,216,000
Increase in repurchase agreements	10,399,000	62,786,000
Issuance under equity compensation plan	-379,000	0
Payment of dividends	-6,528,000	-7,839,000
Repurchase of shares	-100,084,000	-20,590,000
Net cash used in financing activities	-137,443,000	-214,859,000
Decrease in cash and cash equivalents	-70,801,000	-419,936,000
Cash and cash equivalents at beginning of the year	189,460,000	769,180,000
Cash and cash equivalents at end of period	118,659,000	349,244,000
Supplemental disclosure of cash flow information:	'	'
Cash paid during the period for interest	10,168,000	13,741,000
Cash paid during the period for taxes	489,000	26,271,000
Supplemental schedule of non-cash investing activities:	'	'
Loans transferred to other real estate owned at fair value	2,519,000	32,408,000
FDIC indemnification asset claims transferred to other assets	181,000	24,460,000
Loans purchased but not settled	$29,906,000,000	$0

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
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 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.
	These interim consolidated financial statements serve to update the National Bank Holdings Corporation Annual Report on Form 10-K for the year ended December 31, 2013. The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, NBH Bank, N.A. The accompanying 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 Form 10-K. The 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.
	The Company's significant accounting policies followed in the preparation of the consolidated financial statements are disclosed in note 2 of the audited financial statements and notes for the year ended December 31, 2013 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, 2013. 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.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2014
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 $2.1 billion at September 30, 2014 and $2.4 billion at December 31, 2013. Included in the aforementioned $2.1 billion was $1.6 billion of available-for-sale securities and $0.6 billion of held-to-maturity securities.
	Available-for-sale
	Available-for-sale investment securities are summarized as follows as of the dates indicated (in thousands):
		September 30, 2014
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Asset backed securities	$	356	$	—		$	—		$	356
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	419,852		8,089			(814		)	427,127
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	1,145,834		9,949			(30,044		)	1,125,739
	Other securities	419		—			—			419
	Total	$	1,566,461	$	18,038		$	(30,858	)	$	1,553,641
		December 31, 2013
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Asset backed securities	4,534		3			—			4,537
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	490,321		7,670			(3,001		)	494,990
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	1,320,998		10,764			(46,180		)	1,285,582
	Other securities	419		—			—			419
	Total	$	1,816,272	$	18,437		$	(49,181	)	$	1,785,528
	At September 30, 2014 and December 31, 2013, mortgage-backed securities represented 99.9% and 99.7%, respectively, 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 (in thousands):
		September 30, 2014
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		value		losses			value			losses			value		losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	75,906	$	(274	)	$	110,728		$	(540	)	$	186,634	$	(814	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	107,699		(3,038		)	672,803			(27,006		)	780,502		(30,044		)
	Total	$	183,605	$	(3,312	)	$	783,531		$	(27,546	)	$	967,136	$	(30,858	)
		December 31, 2013
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		value		losses			value			losses			value		losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	283,177	$	(3,000	)	$	13		$	(1	)	$	283,190	$	(3,001	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	876,225		(44,101		)	40,740			(2,079		)	916,965		(46,180		)
	Total	$	1,159,402	$	(47,101	)	$	40,753		$	(2,080	)	$	1,200,155	$	(49,181	)
	Management evaluated all of the available-for-sale securities in an unrealized loss position and concluded that no other-than-temporary-impairment existed at September 30, 2014 or December 31, 2013. The unrealized losses in the Company's investments issued or guaranteed by U.S. government agencies or sponsored enterprises at September 30, 2014 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 Company pledges certain securities 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 $272.1 million at September 30, 2014 and $177.6 million December 31, 2013. The increase in pledged available-for-sale investment securities was primarily attributable to an increase in average deposit account balances during the nine months ended September 30, 2014, an increase in pledged securities for derivative instruments, and well as an increase in securities pledged to the Federal Reserve Bank. Certain investment securities may also be pledged as collateral should the Company utilize its line of credit at the FHLB of Des Moines; however, no investment securities were pledged for this purpose at September 30, 2014 or December 31, 2013.
	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 3.6 years as of September 30, 2014 and 3.9 years as of December 31, 2013. 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 September 30, 2014.
	Held-to-maturity
	At September 30, 2014 and December 31, 2013 the Company held $557.5 million and $641.9 million of held-to-maturity investment securities, respectively. Held-to-maturity investment securities are summarized as follows as of the dates indicated (in thousands):
		September 30, 2014
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	444,104	$	3,774		$	(454	)	$	447,424
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	113,360		202			(3,393		)	110,169
	Total investment securities held-to-maturity	$	557,464	$	3,976		$	(3,847	)	$	557,593
		December 31, 2013
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	513,090	$	175		$	(1,776	)	$	511,489
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	128,817		104			-4,005			124,916
	Total investment securities held-to-maturity	$	641,907	$	279		$	(5,781	)	$	636,405
The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period (in thousands):
	September 30, 2014
	Less than 12 months					12 months or more						Total
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
Mortgage-backed securities (“MBS”):
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	—	$	—		$	37,164		$	(454	)	$	37,164	$	(454	)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	10,289		(91		)	82,866			(3,302		)	93,155		(3,393		)
Total	$	10,289	$	(91	)	$	120,030		$	(3,756	)	$	130,319	$	(3,847	)
	December 31, 2013
	Less than 12 months					12 months or more						Total
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
Mortgage-backed securities (“MBS”):
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	472,973	$	(1,776	)	$	—		$	—		$	472,973	$	(1,776	)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	105,124		(4,005		)	—			—			105,124		(4,005		)
Total	$	578,097	$	(5,781	)	$	—		$	—		$	578,097	$	(5,781	)
Management evaluated all of the held-to-maturity securities in an unrealized loss position and concluded that no other-than-temporary-impairment existed at September 30, 2014 or December 31, 2013. The unrealized losses in the Company's investments issued or guaranteed by U.S. government agencies or sponsored enterprises at September 30, 2014 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 $63.6 million and $68.5 million at September 30, 2014 and December 31, 2013, respectively. Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments. The estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio as of September 30, 2014 and December 31, 2013 was 3.5 years and 3.8 years, respectively. This estimate is based on assumptions and actual results may differ.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
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 will be effective for the Company for interim and annual periods beginning after December 15, 2014. Early adoption is permitted. Adoption of this amendment can be made using either a modified retrospective transition method or a prospective transition method. The adoption of this standard is not expected to 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. The amendments are effective for interim and annual periods beginning January 1, 2017 and must be applied retrospectively. The Company is in the process of evaluating the impact of the ASU's adoption on the Company's consolidated financial statements.

Loans

Loans	9 Months Ended
	Sep. 30, 2014
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 10.1% of the total loan portfolio at September 30, 2014, compared to 16.7% of the total loan portfolio at December 31, 2013.
	The table below shows the loan portfolio composition including carrying value by segment of loans accounted for under ASC Topic 310-30 Receivables—Loans and Debt Securities Acquired with Deteriorated Credit Quality and loans not accounted for under this guidance, which includes our originated loans. The table also shows the amounts covered by the FDIC loss sharing agreements as of September 30, 2014 and December 31, 2013. The carrying value of loans are net of discounts on loans excluded from Accounting Standards Codification (“ASC”) Topic 310-30, and fees and costs of $11.7 million and $13.3 million as of September 30, 2014 and December 31, 2013, respectively (in thousands):
		September 30, 2014
		ASC 310-30			Non 310-30			Total loans		% of total
		loans			loans
	Commercial	$	37,665		$	717,507		$	755,172	34.8	%
	Agriculture	20,071			142,801			162,872		7.5	%
	Commercial real estate	213,871			380,445			594,316		27.4	%
	Residential real estate	43,979			579,420			623,399		28.7	%
	Consumer	5,007			30,606			35,613		1.6	%
	Total	$	320,593		$	1,850,779		$	2,171,372	100	%
	Covered	$	183,486		$	35,982		$	219,468	10.1	%
	Non-covered	137,107			1,814,797			1,951,904		89.9	%
	Total	$	320,593		$	1,850,779		$	2,171,372	100	%
		December 31, 2013
		ASC 310-30			Non 310-30			Total loans		% of total
		loans			loans
	Commercial	$	61,511		$	421,984		$	483,495	26.1	%
	Agriculture	27,000			132,952			159,952		8.6	%
	Commercial real estate	291,198			283,022			574,220		31	%
	Residential real estate	63,011			536,913			599,924		32.3	%
	Consumer	8,160			28,343			36,503		2	%
	Total	$	450,880		$	1,403,214		$	1,854,094	100	%
	Covered	$	259,364		$	50,033		$	309,397	16.7	%
	Non-covered	191,516			1,353,181			1,544,697		83.3	%
	Total	$	450,880		$	1,403,214		$	1,854,094	100	%
	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. During 2013, the Company determined that the cash flows of one covered commercial and industrial loan pool were no longer reasonably estimable, and in accordance with the guidance in ASC 310-30, this pool was put on non-accrual status. During the nine months ended September 30, 2014, this loan pool was returned to accrual status due to improved performance and predictability of cash flows within that pool. At September 30, 2014, this loan pool had a carrying value of $13.2 million. Interest income is recognized on all accruing loans accounted for under ASC 310-30 through accretion of the difference between the carrying value of the loans and the expected cash flows.
	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. At September 30, 2014 and December 31, 2013, $18.9 million and $9.5 million, respectively, of loans excluded from the scope of ASC 310-30 were on non-accrual and $14.8 million of loans accounted for under ASC 310-30 were on non-accrual status at December 31, 2013. Loan delinquency for all loans is shown in the following tables at September 30, 2014 and December 31, 2013, respectively (in thousands):
		Total Loans September 30, 2014
		30-59			60-89			Greater		Total  past		Current		Total		Loans > 90		Non-
		days  past			days			than 90		due				loans		days past		accrual
		due			past			days past								due and
					due			due								still
																accruing
	Loans excluded from ASC 310-30
	Commercial	$	2,063		$	314		$	189	$	2,566	$	714,941	$	717,507	$	77	$	12,203
	Agriculture	67			—			—		67		142,734		142,801		—		515
	Commercial real estate
	Construction	—			—			—		—		11,835		11,835		—		—
	Acquisition/development	42			—			—		42		4,553		4,595		—		—
	Multifamily	—			—			95		95		15,784		15,879		94		144
	Owner-occupied	78			89			289		456		122,023		122,479		—		946
	Non owner-occupied	1,961			—			203		2,164		223,493		225,657		—		203
	Total commercial real estate	2,081			89			587		2,757		377,688		380,445		94		1,293
	Residential real estate
	Senior lien	764			279			807		1,850		525,722		527,572		48		4,277
	Junior lien	269			112			18		399		51,449		51,848		—		417
	Total residential real estate	1,033			391			825		2,249		577,171		579,420		48		4,694
	Consumer	135			24			6		165		30,441		30,606		6		231
	Total loans excluded from ASC 310-30	$	5,379		$	818		$	1,607	$	7,804	$	1,842,975	$	1,850,779	$	225	$	18,936
	Covered loans excluded from ASC 310-30	$	78		$	188		$	30	$	296	$	35,686	$	35,982	$	—	$	1,540
	Non-covered loans excluded from ASC 310-30	5,301			630			1,577		7,508		1,807,289		1,814,797		225		17,396
	Total loans excluded from ASC 310-30	$	5,379		$	818		$	1,607	$	7,804	$	1,842,975	$	1,850,779	$	225	$	18,936
	Loans accounted for under ASC 310-30
	Commercial	$	400		$	—		$	4,981	$	5,381	$	32,284	$	37,665	$	4,981	$	—
	Agriculture	—			288			171		459		19,612		20,071		171		—
	Commercial real estate	3,878			25,013			35,870		64,761		149,110		213,871		35,870		—
	Residential real estate	879			156			1,757		2,792		41,187		43,979		1,757		—
	Consumer	147			—			151		298		4,709		5,007		151		—
	Total loans accounted for under ASC 310-30	$	5,304		$	25,457		$	42,930	$	73,691	$	246,902	$	320,593	$	42,930	$	—
	Covered loans accounted for under ASC 310-30	$	3,791		$	23,783		$	34,497	$	62,071	$	121,415	$	183,486	$	34,497	$	—
	Non-covered loans accounted for under ASC 310-30	1,513			1,674			8,433		11,620		125,487		137,107		8,433		—
Total loans accounted for under ASC 310-30	$	5,304		$	25,457		$	42,930	$	73,691	$	246,902	$	320,593	$	42,930	$	—
Total loans	$	10,683		$	26,275		$	44,537	$	81,495	$	2,089,877	$	2,171,372	$	43,155	$	18,936
Covered loans	$	3,869		$	23,971		$	34,527	$	62,367	$	157,101	$	219,468	$	34,497	$	1,540
Non-covered loans	6,814			2,304			10,010		19,128		1,932,776		1,951,904		8,658		17,396
Total loans	$	10,683		$	26,275		$	44,537	$	81,495	$	2,089,877	$	2,171,372	$	43,155	$	18,936
	Total Loans December 31, 2013
	30-59			60-89			Greater		Total  past		Current		Total		Loans > 90		Non-
	days  past			days			than 90		due				loans		days past		accrual
	due			past			days past								due and
				due			due								still
															accruing
Loans excluded from ASC 310-30
Commercial	$	897		$	156		$	555	$	1,608	$	420,376	$	421,984	$	115	$	1,280
Agriculture	188			7			—		195		132,757		132,952		—		153
Commercial real estate
Construction	316			—			—		316		5,023		5,339		—		—
Acquisition/development	45			—			—		45		7,975		8,020		—		1
Multifamily	1,003			—			—		1,003		9,681		10,684		—		1,096
Owner-occupied	52			7			21		80		93,367		93,447		—		692
Non owner-occupied	329			—			203		532		165,000		165,532		—		203
Total commercial real estate	1,745			7			224		1,976		281,046		283,022		—		1,992
Residential real estate
Senior lien	733			415			1,062		2,210		482,381		484,591		—		5,326
Junior lien	204			—			80		284		52,038		52,322		—		519
Total residential real estate	937			415			1,142		2,494		534,419		536,913		—		5,845
Consumer	191			21			23		235		28,108		28,343		14		247
Total loans excluded from ASC 310-30	$	3,958		$	606		$	1,944	$	6,508	$	1,396,706	$	1,403,214	$	129	$	9,517
Covered loans excluded from ASC 310-30	194			60			155		409		49,624		50,033		115		1,944
Non-covered loans excluded from ASC 310-30	3,764			546			1,789		6,099		1,347,082		1,353,181		14		7,573
Total loans excluded from ASC 310-30	$	3,958		$	606		$	1,944	$	6,508	$	1,396,706	$	1,403,214	$	129	$	9,517
Loans accounted for under ASC 310-30
Commercial	$	582		$	322		$	4,505	$	5,409	$	56,102	$	61,511	$	4,505	$	14,827
Agriculture	714			—			296		1,010		25,990		27,000		296		—
Commercial real estate	1,902			5,179			49,228		56,309		234,889		291,198		49,227		—
Residential real estate	977			977			1,817		3,771		59,240		63,011		1,817		—
Consumer	327			265			19		611		7,549		8,160		19		—
Total loans accounted for under ASC 310-30	$	4,502		$	6,743		$	55,865	$	67,110	$	383,770	$	450,880	$	55,864	$	14,827
Covered loans accounted for under ASC 310-30	$	1,471		$	4,949		$	42,356	$	48,776	$	210,588	$	259,364	$	42,355	$	14,827
Non-covered loans accounted for under ASC 310-30	3,031			1,794			13,509		18,334		173,182		191,516		13,509		—
Total loans accounted for under ASC 310-30	$	4,502		$	6,743		$	55,865	$	67,110	$	383,770	$	450,880	$	55,864	$	14,827
Total loans	$	8,460		$	7,349		$	57,809	$	73,618	$	1,780,476	$	1,854,094	$	55,993	$	24,344
Covered loans	$	1,665		$	5,009		$	42,511	$	49,185	$	260,212	$	309,397	$	42,470	$	16,771
Non-covered loans	6,795			2,340			15,298		24,433		1,520,264		1,544,697		13,523		7,573
Total loans	$	8,460		$	7,349		$	57,809	$	73,618	$	1,780,476	$	1,854,094	$	55,993	$	24,344
Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows as of September 30, 2014 and December 31, 2013, respectively (in thousands):
	Total Loans September 30, 2014
	Pass			Special			Substandard		Doubtful		Total
				mention
Loans excluded from ASC 310-30
Commercial	$	686,475		$	2,973		$	28,022	$	37	$	717,507
Agriculture	132,749			92			9,960		—		142,801
Commercial real estate
Construction	11,835			—			—		—		11,835
Acquisition/development	4,595			—			—		—		4,595
Multifamily	15,735			—			128		16		15,879
Owner-occupied	117,256			161			5,062		—		122,479
Non owner-occupied	204,212			17,788			3,647		10		225,657
Total commercial real estate	353,633			17,949			8,837		26		380,445
Residential real estate
Senior lien	521,525			103			5,758		186		527,572
Junior lien	50,513			—			1,335		—		51,848
Total residential real estate	572,038			103			7,093		186		579,420
Consumer	30,376			—			230		—		30,606
Total loans excluded from ASC 310-30	$	1,775,271		$	21,117		$	54,142	$	249	$	1,850,779
Covered loans excluded from ASC 310-30	$	21,300		$	2,404		$	12,154	$	124	$	35,982
Non-covered loans excluded from ASC 310-30	1,753,971			18,713			41,988		125		1,814,797
Total loans excluded from ASC 310-30	$	1,775,271		$	21,117		$	54,142	$	249	$	1,850,779
Loans accounted for under ASC 310-30
Commercial	$	13,101		$	348		$	23,682	$	534	$	37,665
Agriculture	17,598			203			2,270		—		20,071
Commercial real estate	87,361			4,067			118,453		3,990		213,871
Residential real estate	30,066			1,447			12,466		—		43,979
Consumer	4,310			114			583		—		5,007
Total loans accounted for under ASC 310-30	$	152,436		$	6,179		$	157,454	$	4,524	$	320,593
Covered loans accounted for under ASC 310-30	$	54,336		$	3,452		$	121,176	$	4,522	$	183,486
Non-covered loans accounted for under ASC 310-30	98,100			2,727			36,278		2		137,107
Total loans accounted for under ASC 310-30	$	152,436		$	6,179		$	157,454	$	4,524	$	320,593
Total loans	$	1,927,707		$	27,296		$	211,596	$	4,773	$	2,171,372
Total covered	$	75,636		$	5,856		$	133,330	$	4,646	$	219,468
Total non-covered	1,852,071			21,440			78,266		127		1,951,904
Total loans	$	1,927,707		$	27,296		$	211,596	$	4,773	$	2,171,372
	Total Loans December 31, 2013
	Pass			Special			Substandard		Doubtful		Total
				mention
Loans excluded from ASC 310-30
Commercial	$	374,281		$	9,882		$	37,414	$	407	$	421,984
Agriculture	123,216			9,049			687		—		132,952
Commercial real estate
Construction	5,339			—			—		—		5,339
Acquisition/development	1,366			2,247			4,407		—		8,020
Multifamily	9,588			—			1,068		28		10,684
Owner-occupied	87,984			169			5,294		—		93,447
Non owner-occupied	142,159			18,536			4,837		—		165,532
Total commercial real estate	246,436			20,952			15,606		28		283,022
Residential real estate
Senior lien	475,041			1,495			7,620		435		484,591
Junior lien	49,874			200			2,248		—		52,322
Total residential real estate	524,915			1,695			9,868		435		536,913
Consumer	28,092			—			251		—		28,343
Total loans excluded from ASC 310-30	$	1,296,940		$	41,578		$	63,826	$	870	$	1,403,214
Covered loans excluded from ASC 310-30	$	22,175		$	3,439		$	24,005	$	414	$	50,033
Non-covered loans excluded from ASC 310-30	1,274,765			38,139			39,821		456		1,353,181
Total loans excluded from ASC 310-30	$	1,296,940		$	41,578		$	63,826	$	870	$	1,403,214
Loans accounted for under ASC 310-30
Commercial	$	23,129		$	3,221		$	34,440	$	721	$	61,511
Agriculture	21,900			1,117			3,983		—		27,000
Commercial real estate	115,903			12,493			157,748		5,054		291,198
Residential real estate	43,904			1,098			18,009		—		63,011
Consumer	6,921			244			995		—		8,160
Total loans accounted for under ASC 310-30	$	211,757		$	18,173		$	215,175	$	5,775	$	450,880
Covered loans accounted for under ASC 310-30	$	100,050		$	8,498		$	145,041	$	5,775	$	259,364
Non-covered loans accounted for under ASC 310-30	111,707			9,675			70,134		—		191,516
Total loans accounted for under ASC 310-30	$	211,757		$	18,173		$	215,175	$	5,775	$	450,880
Total loans	$	1,508,697		$	59,751		$	279,001	$	6,645	$	1,854,094
Total covered	$	122,225		$	11,937		$	169,046	$	6,189	$	309,397
Total non-covered	1,386,472			47,814			109,955		456		1,544,697
Total loans	$	1,508,697		$	59,751		$	279,001	$	6,645	$	1,854,094
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 and troubled debt restructurings (“TDRs”) described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral dependent loans. At September 30, 2014, the Company measured $24.5 million of impaired loans using discounted cash flows and the loan’s initial contractual effective interest rate and $14.2 million of impaired loans based on the fair value of the collateral less selling costs. Impaired loans totaling $8.6 million that individually were less than $250 thousand each, were measured through our general ALL reserves due to their relatively small size.
At September 30, 2014 and December 31, 2013, the Company’s recorded investments in impaired loans was $47.2 million and $21.6 million, respectively, of which $11.8 million and $7.7 million were covered by loss sharing agreements, for the aforementioned periods. The increase in impaired loans was primarily in the commercial loan segment, and largely the result of two relationships, the first of which totaled $11.5 million and was fully secured and current as to principal and interest payments as of September 30, 2014. The second relationship totaled $7.4 million, is covered by loss-share and also current as to principal and interest payments as of September 30, 2014. Impaired loans had a collective related allowance for loan losses allocated to them of $0.3 million and $0.9 million at September 30, 2014 and December 31, 2013, respectively. Additional information regarding impaired loans at September 30, 2014 and December 31, 2013 is set forth in the table below (in thousands):
	Impaired Loans
	September 30, 2014								December 31, 2013
	Unpaid			Recorded			Allowance		Unpaid		Recorded		Allowance
	principal			investment			for loan		principal		investment		for loan
	balance						losses		balance				losses
							allocated						allocated
With no related allowance recorded:
Commercial	$	25,111		$	24,974		$	—	$	4,981	$	4,981	$	—
Agriculture	9,314			9,310			—		—		—		—
Commercial real estate
Construction	—			—			—		—		—		—
Acquisition/development	—			—			—		—		—		—
Multifamily	—			—			—		987		929		—
Owner-occupied	1,746			1,514			—		1,872		1,655		—
Non-owner occupied	—			—			—		561		488		—
Total commercial real estate	1,746			1,514			—		3,420		3,072		—
Residential real estate
Senior lien	376			363			—		506		494		—
Junior lien	—			—			—		—		—		—
Total residential real estate	376			363			—		506		494		—
Consumer	—			—			—		—		—		—
Total impaired loans with no related allowance recorded	$	36,547		$	36,161		$	—	$	8,907	$	8,547	$	—
With a related allowance recorded:
Commercial	$	1,030		$	801		$	39	$	2,529	$	2,379	$	416
Agriculture	181			150			—		191		173		1
Commercial real estate
Construction	—			—			—		—		—		—
Acquisition/development	—			—			—		—		1		—
Multifamily	161			144			16		178		168		28
Owner-occupied	848			606			3		825		607		4
Non-owner occupied	1,142			1,061			12		640		628		4
Total commercial real estate	2,151			1,811			31		1,643		1,404		36
Residential real estate
Senior lien	7,479			6,575			210		8,147		7,266		474
Junior lien	1,697			1,477			10		1,815		1,605		16
Total residential real estate	9,176			8,052			220		9,962		8,871		490
Consumer	280			250			3		290		273		3
Total impaired loans with a related allowance recorded	$	12,818		$	11,064		$	293	$	14,615	$	13,100	$	946
Total impaired loans	$	49,365		$	47,225		$	293	$	23,522	$	21,647	$	946
The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented (in thousands):
	For the nine months ended
	30-Sep-14						30-Sep-13
	Average recorded investment			Interest income recognized			Average recorded investment		Interest income recognized
With no related allowance recorded:
Commercial	$	25,947		$	342		$	6,169	$	276
Agriculture	9,045			217			—		—
Commercial real estate
Construction	—			—			—		—
Acquisition/development	—			—			—		—
Multifamily	—			—			958		—
Owner-occupied	1,578			63			4,031		226
Non owner-occupied	—			—			5,188		8
Total commercial real estate	1,578			63			10,177		234
Residential real estate
Senior lien	391			8			752		6
Junior lien	—			—			—		—
Total residential real estate	391			8			752		6
Consumer	—			—			—		—
Total impaired loans with no related allowance recorded	$	36,961		$	630		$	17,098	$	516
With a related allowance recorded:
Commercial	$	987		$	6		$	2,744	$	53
Agriculture	165			—			224		—
Commercial real estate
Construction	—			—			—		—
Acquisition/development	—			—			1		—
Multifamily	156			—			187		—
Owner-occupied	627			10			668		11
Non owner-occupied	1,086			42			636		14
Total commercial real estate	1,869			52			1,492		25
Residential real estate
Senior lien	6,738			81			7,310		71
Junior lien	1,515			45			1,736		40
Total residential real estate	8,253			126			9,046		111
Consumer	266			1			313		3
Total impaired loans with a related allowance recorded	$	11,540		$	185		$	13,819	$	192
Total impaired loans	$	48,501		$	815		$	30,917	$	708
Troubled debt restructurings
It is the Company’s policy to review each prospective credit in order to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include restructuring a loan to provide a concession by the Company to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Additionally, if a borrower’s repayment obligation has been discharged by a court, and that debt has not been reaffirmed by the borrower, regardless of past due status, the loan is considered to be a TDR. At September 30, 2014 and December 31, 2013, the Company had $25.0 million and $11.6 million, respectively, of accruing TDRs that had been restructured from the original terms in order to facilitate repayment. Of these, $9.2 million and $5.7 million, respectively, were covered by FDIC loss sharing agreements.
Non-accruing TDRs at September 30, 2014 and December 31, 2013 totaled $3.7 million and $3.6 million, respectively. Of these, $1.4 million and $1.7 million were covered by the FDIC loss sharing agreements as of September 30, 2014 and December 31, 2013, respectively.
During the nine months ended September 30, 2014, the Company restructured fourteen loans with a recorded investment of $20.4 million to facilitate repayment. Substantially all of the loan modifications were an extension of term. Loan modifications to loans accounted for under ASC 310-30 are not considered TDRs. The table below provides additional information related to accruing TDRs at September 30, 2014 and December 31, 2013 (in thousands):
	Accruing TDRs
	30-Sep-14
	Recorded			Average			Unpaid		Unfunded
	investment			year-to-			principal		commitments
				date			balance		to fund
				recorded					TDRs
				investment
Commercial	$	12,573		$	12,131		$	12,573	$	840
Agriculture	8,946			8,680			8,949		126
Commercial real estate	620			631			632		—
Residential real estate	2,877			2,932			2,902		2
Consumer	20			21			20		—
Total	$	25,036		$	24,395		$	25,076	$	968
	Accruing TDRs
	December 31, 2013
	Recorded			Average			Unpaid		Unfunded
	investment			year-to-			principal		commitments
				date			balance		to fund
				recorded					TDRs
				investment
Commercial	$	6,079		$	7,113		$	6,084	$	144
Agriculture	20			20			20		—
Commercial real estate	2,484			2,759			2,743		—
Residential real estate	2,995			3,055			3,023		12
Consumer	27			30			27		12
Total	$	11,605		$	12,977		$	11,897	$	168
The following table summarizes the Company’s carrying value of non-accrual TDRs as of September 30, 2014 and December 31, 2013 (in thousands):
	Non - Accruing TDRs
	September 30, 2014						December 31, 2013
	Covered			Non-covered			Covered		Non-covered
Commercial	$	1		$	429		$	—	$	535
Agriculture	201			180			—		—
Commercial real estate	246			470			296		98
Residential real estate	945			996			1,377		1,031
Consumer	—			199			—		237
Total	$	1,393		$	2,274		$	1,673	$	1,901
Accrual of interest is resumed on loans that were on non-accrual only after the loan has performed sufficiently. The Company had three TDRs that were modified within the past 12 months and had defaulted on their restructured terms during the nine months ended September 30, 2014. The defaulted TDRs consisted of a commercial loan and two consumer loans totaling $37 thousand.
During the nine months ended September 30, 2013, the Company had two TDRs that had been modified within the past 12 months that defaulted on its restructured terms. The defaulted TDRs were a commercial loan and a consumer loan totaling $328 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 large loans if circumstances specific to that loan warrant a prepayment assumption. No prepayments were presumed for small homogeneous commercial loans; however, prepayment assumptions are made that consider similar prepayment factors listed above for smaller homogeneous loans. The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the nine months ended September 30, 2014 and 2013 (in thousands):
	September 30,			September 30,
	2014			2013
Accretable yield beginning balance	$	130,624		$	133,585
Reclassification from non-accretable difference	30,394			55,351
Reclassification to non-accretable difference	(1,264		)	(5,234		)
Accretion	(46,646		)	(59,616		)
Accretable yield ending balance	$	113,108		$	124,086
Below is the composition of the net book value for loans accounted for under ASC 310-30 at September 30, 2014 and December 31, 2013 (in thousands):
	September 30,			December 31,
	2014			2013
Contractual cash flows	$	807,075		$	984,019
Non-accretable difference	(373,374		)	(402,515		)
Accretable yield	(113,108		)	(130,624		)
Loans accounted for under ASC 310-30	$	320,593		$	450,880

Allowance_for_Loan_Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2014
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 nine months ended September 30, 2014 and 2013 (in thousands):
		Three months ended September 30, 2014
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	6,421		$	1,407		$	2,969		$	4,310		$	465		$	15,572
	Non 310-30 beginning balance	6,420			610			2,735			4,244			465			14,474
	Charge-offs	(86		)	—			—			(470		)	(230		)	(786		)
	Recoveries	189			8			16			22			55			290
	Provision	859			102			166			338			241			1,706
	Non 310-30 ending balance	7,382			720			2,917			4,134			531			15,684
	ASC 310-30 beginning balance	1			797			234			66			—			1,098
	Charge-offs	—			—			—			—			—			—
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	—			(184		)	(7		)	—			—			(191		)
	ASC 310-30 ending balance	1			613			227			66			—			907
	Ending balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
		Three months ended September 30, 2013
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	2,286		$	764		$	2,419		$	5,907		$	471		$	11,847
	Non 310-30 beginning balance	2,240			495			2,113			4,333			471			9,652
	Charge-offs	(401		)	—			—			(117		)	(276		)	(794		)
	Recoveries	92			—			17			23			75			207
	Provision (recoupment)	715			27			(205		)	27			186			750
	Non 310-30 ending balance	2,646			522			1,925			4,266			456			9,815
	ASC 310-30 beginning balance	46			269			306			1,574			—			2,195
	Charge-offs	—			(221		)	—			(57		)	—			(278		)
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	43			537			(8		)	(885		)	—			(313		)
	ASC 310-30 ending balance	89			585			298			632			—			1,604
	Ending balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
		Nine months ended September 30, 2014
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	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	(498		)	—			—			(539		)	(585		)	(1,622		)
	Recoveries	306			8			70			197			205			786
	Provision	3,545			140			863			311			420			5,279
	Non 310-30 ending balance	7,382			720			2,917			4,134			531			15,684
	ASC 310-30 beginning balance	229			665			292			94			—			1,280
	Charge-offs	(2		)	—			—			—			(36		)	(38		)
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	(226		)	(52		)	(65		)	(28		)	36			(335		)
	ASC 310-30 ending balance	1			613			227			66			—			907
	Ending balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
	Ending allowance balance attributable to:
	Non 310-30 loans individually evaluated for impairment	$	39		$	—		$	31		$	220		$	3		$	293
	Non 310-30 loans collectively evaluated for impairment	7,343			720			2,886			3,914			528			15,391
	ASC 310-30 loans	1			613			227			66			—			907
	Total ending allowance balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
	Loans:
	Non 310-30 individually evaluated for impairment	$	25,776		$	9,460		$	3,325		$	8,415		$	250		$	47,226
	Non 310-30 collectively evaluated for impairment	691,731			133,341			377,120			571,005			30,356			1,803,553
	ASC 310-30 loans	37,665			20,071			213,871			43,979			5,007			320,593
	Total loans	$	755,172		$	162,872		$	594,316		$	623,399		$	35,613		$	2,171,372
		Nine months ended September 30, 2013
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	2,798		$	592		$	7,396		$	4,011		$	583		$	15,380
	Non 310-30 beginning balance	2,798			323			3,056			4,011			540			10,728
	Charge-offs	(1,654		)	—			(943		)	(741		)	(717		)	(4,055		)
Recoveries	187			13			129			64			224			617
Provision (recoupment)	1,315			186			(317		)	932			409			2,525
Non 310-30 ending balance	2,646			522			1,925			4,266			456			9,815
ASC 310-30 beginning balance	—			269			4,340			—			43			4,652
Charge-offs	(407		)	(221		)	(2,796		)	(623		)	—			(4,047		)
Recoveries	—			—			—			—			—			—
Provision (recoupment)	496			537			(1,246		)	1,255			(43		)	999
ASC 310-30 ending balance	89			585			298			632			—			1,604
Ending balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
Ending allowance balance attributable to:
Non 310-30 loans individually evaluated for impairment	$	92		$	1		$	40		$	533		$	7		$	673
Non 310-30 loans collectively evaluated for impairment	2,554			521			1,885			3,733			449			9,142
ASC 310-30 loans	89			585			298			632			—			1,604
Total ending allowance balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
Loans:
Non 310-30 individually evaluated for impairment	$	7,670		$	223		$	11,258		$	9,629		$	295		$	29,075
Non 310-30 collectively evaluated for impairment	264,444			117,241			277,494			513,531			28,018			1,200,728
ASC 310-30 loans	68,250			37,882			325,701			72,409			8,768			513,010
Total loans	$	340,364		$	155,346		$	614,453		$	595,569		$	37,081		$	1,742,813
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 September 30, 2014 and $0.8 million net charge-offs of non 310-30 loans during the nine months ended September 30, 2014. 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 nine months ended September 30, 2014, and, through management's evaluation, resulted in a provision for loan losses on the non 310-30 loans of $1.7 million and $5.3 million during the three and nine months ended September 30, 2014, respectively.
During the nine months ended September 30, 2014, the Company re-estimated 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 net recoupment of impairment of $191 thousand and $335 thousand for the three and nine months ended September 30, 2014, respectively, which was comprised of recoupment of previous valuation allowances of $184 thousand during the three months ended September 30, 2014 in the agriculture segment and $226 thousand during the nine months ended September 30, 2014 in the commercial segment.
The Company charged off $0.6 million and $3.4 million, net of recoveries, of non ASC 310-30 loans during the three and nine months ended September 30, 2013, respectively. The Company had previously provided specific reserves for $0.4 million and $1.7 million of the net charge-offs realized during the three and nine months ended September 30, 2013. Improvements in credit quality trends of the non 310-30 portfolio were seen in both past due and non-performing loans during the three and nine months ended September 30, 2013, and through management's evaluation, resulted in a provision for loan losses of $0.8 million and $2.5 million, respectively.
The Company's re-measurement of expected future cash flows of ASC 310-30 loans resulted in net recoupment of $0.3 million and a net impairment of $1.0 million for the three and nine months ended September 30, 2013, respectively. During the three months ended September 30, 2013, the re-measurements resulted in a recoupment of $0.9 million of impairment expense in the residential real estate segment and net impairments of $0.5 million in the agriculture segment. During the nine months ended September 30, 2013, the re-measurements resulted in a recoupment of previous valuation allowances of $1.2 million in the commercial real estate segment and net impairments of $1.3 million, $0.5 million and $0.5 million in the residential real estate, agriculture, and commercial segments, respectively.

FDIC_Indemnification_Asset

FDIC Indemnification Asset	9 Months Ended
	Sep. 30, 2014
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 in the period in which they occur.
	Below is a summary of the activity related to the FDIC indemnification asset during the nine months ended September 30, 2014 and 2013 (in thousands):
		For the nine months ended
		September 30,			September 30,
		2014			2013
	Balance at beginning of period	$	64,447		$	86,923
	Amortization	(19,819		)	(11,843		)
	FDIC portion of (recoveries) charge-offs exceeding fair value marks	(34		)	7,466
	Changes for FDIC loss share submissions	(181		)	(24,460		)
	Balance at end of period	$	44,413		$	58,086
	The $19.8 million of amortization of the FDIC indemnification asset recognized during the nine months ended September 30, 2014 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 loans as an adjustment to yield. The loss claims filed with the FDIC are subject to review and approval, including extensive audits by the FDIC or its assigned agents for compliance with the terms in the loss sharing agreements. During the nine months ended September 30, 2014, the Company received a net $181 thousand from the FDIC.
	During the nine months ended September 30, 2013, the Company recognized $11.8 million of amortization on the FDIC indemnification asset, and further reduced the carrying value of the FDIC indemnification asset by $24.5 million as a result of claims filed with the FDIC. During the nine months ended September 30, 2013, the Company received $77.0 million in payments from the FDIC.

Other_Real_Estate_Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Other Real Estate Owned	'
	Other Real Estate Owned
	A summary of the activity in the OREO balances during the nine months ended September 30, 2014 and 2013 is as follows (in thousands):
		For the nine months ended September 30,
		2014			2013
	Beginning balance	$	70,125		$	94,808
	Transfers from loan portfolio, at fair value	2,519			32,408
	Impairments	(1,789		)	(9,142		)
	Sales	(27,656		)	(54,705		)
	Gain on sale of OREO, net	2,686			7,384
	Ending balance	$	45,885		$	70,753
	Of the $45.9 million of OREO at September 30, 2014, $30.1 million, or 65.7%, was covered by loss sharing agreements with the FDIC. At December 31, 2013, $38.8 million, or 55.4%, of the $70.1 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.
	The OREO balance at December 31, 2013 includes the interests of several outside participating banks totaling $4.2 million, for which an offsetting liability is recorded in other liabilities. At September 30, 2014, the Company did not own property that contained the interest of outside participating banks. The OREO balances exclude $8.5 million and $10.6 million at September 30, 2014 and December 31, 2013, 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.

Regulatory_Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Regulatory Capital	'
	Regulatory Capital
	At September 30, 2014 and December 31, 2013, NBH Bank, N.A. 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 (in thousands):
		September 30, 2014
		Actual				Required to be				Required to be
						considered well				considered
						capitalized (1)				adequately
										capitalized
		Ratio		Amount		Ratio		Amount		Ratio		Amount
	Tier 1 leverage ratio
	Consolidated	15.2	%	$	729,216	N/A		N/A		4	%	$	191,465
	NBH Bank, N.A.	11.9	%	568,864		10	%	$	476,688	4	%	190,675
	Tier 1 risk-based capital ratio (2)
	Consolidated	29.4	%	$	729,216	6	%	$	148,680	4	%	$	99,120
	NBH Bank, N.A.	23.1	%	568,864		11	%	270,429		4	%	98,338
	Total risk-based capital ratio (2)
	Consolidated	30.1	%	$	746,208	10	%	$	247,800	8	%	$	198,240
	NBH Bank, N.A.	23.8	%	585,856		12	%	295,014		8	%	196,676
		December 31, 2013
		Actual				Required to be				Required to be
						considered well				considered
						capitalized (1)				adequately
										capitalized
		Ratio		Amount		Ratio		Amount		Ratio		Amount
	Tier 1 leverage ratio
	Consolidated	16.6	%	$	822,688	N/A		N/A		4	%	$	197,906
	NBH Bank, N.A.	11.3	%	556,876		10	%	$	491,294	4	%	196,518
	Tier 1 risk-based capital ratio (2)
	Consolidated	38.9	%	$	822,688	6	%	$	126,865	4	%	$	84,577
	NBH Bank, N.A.	26.6	%	556,876		11	%	230,334		4	%	83,758
	Total risk-based capital ratio (2)
	Consolidated	39.5	%	$	835,810	10	%	$	211,442	8	%	$	169,153
	NBH Bank, N.A.	27.2	%	569,998		12	%	251,273		8	%	167,515
	-1	These ratio requirements for NBH Bank, N.A. are reflective of the agreements NBH Bank, N.A. has made with its various regulators 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 covered assets are risk-weighted at 20% for purposes of risk-based capital computations.

FDIC_Loss_Sharing_Income

FDIC Loss Sharing Income	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
FDIC Loss Sharing Income	'
	FDIC Loss Sharing (Expense) Income
	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 statements of operations. The table below provides additional details of the Company’s FDIC loss sharing (expense) income during the three and nine months ended September 30, 2014 and 2013 (in thousands):
		For the three months ended						For the nine months ended
		September 30, 2014			September 30, 2013			September 30, 2014			September 30, 2013
	Clawback liability amortization	$	(345	)	$	(314	)	$	(1,009	)	$	(937	)
	Clawback liability remeasurement	(592		)	(405		)	(1,646		)	244
	Reimbursement to FDIC for gain on sale of and income from covered OREO	(1,587		)	(2,514		)	(3,287		)	(4,615		)
	Reimbursement to FDIC for recoveries	(62		)	—			(180		)	(22		)
	FDIC reimbursement of covered asset resolution costs	1,643			2,042			3,573			8,608
	Total	$	(943	)	$	(1,191	)	$	(2,549	)	$	3,278

Stockbased_Compensation_and_Em

Stock-based Compensation and Employee Benefits	9 Months Ended
	Sep. 30, 2014
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.
	The aggregate number of Class A common stock available for issuance under the 2014 Plan is 4,519,533 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 nine months ended September 30, 2014. The following table summarizes stock option activity for the nine months ended September 30, 2014:
		Options		Weighted		Weighted	Aggregate
				Average		Average	Intrinsic
				Exercise		Remaining	Value
				Price		Contractual
						Term in
						Years
	Outstanding at December 31, 2013	3,515,486		$	19.92	6.13	$	5,183,567
	Granted	114,148		18.93
	Forfeited	(4,360	)	18.36
	Surrendered	(9,705	)	20
	Exercised	(295	)	20
	Expired	(2,083	)	20
	Outstanding at September 30, 2014	3,613,191		$	19.89	5.53	$	168,864
	Options fully vested and exercisable at September 30, 2014	2,957,498		$	19.99	5.3	$	—
	Options expected to vest	611,407		$	19.5	6.39	$	142,375
	Stock option expense is included in salaries and benefits in the accompanying consolidated statements of operations and totaled $0.3 million and $0.5 million for the three months ended September 30, 2014 and 2013, respectively, and $1.0 million and $1.8 million for the nine months ended September 30, 2014 and 2013, respectively. At September 30, 2014, 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 0.9 years.
	Expense related to non-vested restricted stock totaled $0.8 million during each of the three months ended September 30, 2014 and 2013 and $1.8 million and $2.2 million during the nine months ended September 30, 2014 and 2013, respectively, and is included in salaries and benefits in the Company’s consolidated statements of operations. As of September 30, 2014, there was $2.5 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 0.7 years. The following table summarizes restricted stock activity for the nine months ended September 30, 2014:
		Total Restricted Shares		Weighted Average Grant-Date Fair Value
	Unvested at December 31, 2013	1,064,460		$	15.16
	Vested	(29,651	)	19.5
	Granted	147,086		18.98
	Forfeited	(13,780	)	14.58
	Surrendered	(18,610	)	19.16
	Unvested at September 30, 2014	1,149,505		$	15.48

Warrants

Warrants	9 Months Ended
	Sep. 30, 2014
Warrants and Rights Note Disclosure [Abstract]	'
Warrants	'
	Warrants
	At September 30, 2014 and December 31, 2013, 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 $3.5 million and $6.3 million at September 30, 2014 and December 31, 2013, respectively. The fair value of the warrants was estimated using a Black-Scholes option pricing model utilizing the following assumptions at the indicated dates:
		September 30, 2014		December 31, 2013
	Risk-free interest rate	1.87	%	2.16	%
	Expected volatility	25.85	%	33.8	%
	Expected term (years)	6-May		7-Jun
	Dividend yield	1.05	%	0.93	%
	The Company’s shares became publicly traded on September 20, 2012 and prior to that, had limited private trading. Due to the limited historical volatility of the Company's own stock, expected volatility was calculated using a time-based weighted migration of the Company’s own stock price volatility coupled with the median historical volatility, for a period commensurate with the expected term of the warrants, of those of a peer group. The risk-free rate for the expected term of the warrants was based on the U.S. Treasury yield curve and based on the expected term. The expected term was estimated based on the contractual term of the warrants.
	The Company recorded a benefit of $1.3 million and $2.7 million for the three and nine months ended September 30, 2014, respectively, and an expense of $0.4 million and $0.1 million for the three and nine months ended September 30, 2013, respectively, in the consolidated statements of operations resulting from the change in fair value of the warrant liability.

Common_Stock

Common Stock	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Common Stock	'
	Common Stock
	During the three and nine months ended September 30, 2014, the Company repurchased 2,774,863 and 5,085,458 shares for $55.0 million and $100.1 million at weighted average prices of $19.82 and $19.66 per share, respectively. On October 21, 2014, the Board of Directors authorized a new share repurchase program for up to $50.0 million in share repurchases from time to time in either the open market or through privately negotiated transactions.
	The Company had 38,995,050 shares of Class A common stock and 867,774 shares of Class B common stock outstanding as of September 30, 2014, and 41,890,562 shares of Class A common stock and 3,027,774 shares of Class B common stock outstanding as of December 31, 2013. Additionally, as of September 30, 2014 and December 31, 2013, the Company had 1,149,505 and 1,064,460 shares, respectively, of restricted Class A common stock issued but not yet vested under the 2014 Plan and the Prior Plan.

Income_Per_Share

Income Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Income Per Share	'
	Income Per Share
	The Company calculates income per share under the two-class method, as certain non-vested share awards contain non-forfeitable rights to dividends. As such, these awards are considered securities that participate in the earnings of the Company. Non-vested shares are discussed further in note 10.
	The Company had 39,862,824 and 51,213,044 shares outstanding (inclusive of Class A and B) as of September 30, 2014 and 2013, respectively. Certain stock options and non-vested restricted shares are potentially dilutive securities, but are not included in the calculation of diluted earnings per share because to do so would have been anti-dilutive for three and nine months ended September 30, 2014 and 2013, respectively.
	The following table illustrates the computation of basic and diluted income per share for the three and nine months ended September 30, 2014 and 2013 (in thousands, except share and earnings per share information):
		For the three months ended						For the nine months ended
		September 30,			September 30,			September 30,			September 30,
		2014			2013			2014			2013
	Distributed earnings	$	2,159		$	2,622		$	6,666		$	7,934
	Undistributed earnings (distributions in excess of earnings)	1,178			(1,675		)	231			(2,007		)
	Net income	$	3,337		$	947		$	6,897		$	5,927
	Less: earnings allocated to participating securities	(12		)	(5		)	(28		)	(12		)
	Earnings allocated to common shareholders	$	3,325		$	942		$	6,869		$	5,915
	Weighted average shares outstanding for basic earnings per common share	41,837,485			51,454,200			43,403,791			51,940,245
	Dilutive effect of equity awards	4,200			45,301			19,482			32,916
	Dilutive effect of warrants	—			2,479			—			—
	Weighted average shares outstanding for diluted earnings per common share	41,841,685			51,501,980			43,423,273			51,973,161
	Basic earnings per share	$	0.08		$	0.02		$	0.16		$	0.11
	Diluted earnings per share	$	0.08		$	0.02		$	0.16		$	0.11
	The Company had 3,613,191 and 3,538,012 outstanding stock options to purchase common stock at weighted average exercise prices of $19.89 and $19.92 per share at September 30, 2014 and 2013, 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 September 30, 2014 and 2013. The warrants have an exercise price of $20.00, which was out-of-the-money for purposes of dilution calculations during the three and nine months ended September 30, 2014. The Company had 1,149,505 and 1,087,154 unvested restricted shares outstanding as of September 30, 2014 and 2013, respectively, which have performance, market and/or time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those restricted shares is dilutive

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2014
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 September 30, 2014 and December 31, 2013 (dollars in thousands).
	Information about the valuation methods used to measure fair value is provided in note 16.
				Asset Derivatives										Liability Derivatives
				Fair Value										Fair Value
		Balance Sheet Location		September 30, 2014				December 31, 2013				Balance Sheet Location		September 30, 2014			December 31, 2013
	Derivatives designated as hedging instruments
	Interest rate products	Other assets		$	17			$	129			Other liabilities		$	1,259		$	—
	Total derivatives designated as hedging instruments			$	17			$	129					$	1,259		$	—
	Derivatives not designated as hedging instruments
	Interest rate products	Other assets		$	721			$	73			Other liabilities		$	774		$	74
	Total derivatives not designated as hedging instruments			$	721			$	73					$	774		$	74
	Fair value hedges of interest rate risk
	Interest rate swaps designated as fair value hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. As of September 30, 2014, the Company had nine interest rate swaps with a notional amount of $63.7 million that were designated as fair value hedges of interest rate risk associated with the Company’s fixed-rate loans. The Company had one outstanding interest rate swap with a notional amount of $10.0 million that was designated as a fair value hedge as of December 31, 2013.
	For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. The Company includes the gain or loss on the hedged items in the same line item as the offsetting loss or gain on the related derivatives. During the three and nine months ended September 30, 2014, the Company recognized a net loss of $45.9 thousand and $185.5 thousand, respectively, in non-interest expense related to hedge ineffectiveness. During the three and nine months ended September 30, 2013, the Company did not participate in fair value hedges that would result in hedge ineffectiveness.
	Non-designated hedges
	Derivatives not designated as hedges are not speculative and consist of interest rate swaps with commercial banking clients that facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the client swaps and the offsetting swaps are recognized directly in earnings. As of September 30, 2014, the Company had nine matched interest rate swap transactions with an aggregate notional amount of $27.3 million related to this program. As of December 31, 2013, the Company had three matched interest rate swap transactions with an aggregate notional amount of $7.3 million related to this program.
	Effect of Derivative Instruments on the Consolidated Statement of Operations
	The tables below present the effect of the Company’s derivative financial instruments on the consolidated statement of operations for the three and nine months ended September 30, 2014 and 2013 (in thousands).
	Derivatives in fair value hedging relationships		Location of loss recognized in income on derivatives		Amount of loss recognized in income on derivatives
					Three months ended September 30,								For the nine months ended September 30,
					2014				2013				2014			2013
	Interest rate products		Interest income		$	(36	)		$	—			$	(1,371	)	$	—
	Total				$	(36	)		$	—			$	(1,371	)	$	—
	Derivatives in fair value hedging relationships		Location of gain or (loss) recognized in income on derivatives		Amount of gain or (loss) recognized in income on hedged items
					Three months ended September 30,								For the nine months ended September 30,
					2014				2013				2014			2013
	Interest rate products		Interest income		$	(10	)		$	—			$	1,185		$	—
	Total				$	(10	)		$	—			$	1,185		$	—
					Amount of loss recognized in income on derivatives
					Three months ended September 30,								For the nine months ended September 30,
	Derivatives not designated as hedging instruments		Location of loss recognized in income on derivatives		2014				2013				2014			2013
	Interest rate products		Other non-interest income		$	(1	)		$	(7	)		$	(51	)	(7	)
	Total				$	(1	)		$	(7	)		$	(51	)	(7	)
	Credit-risk-related Contingent Features
	The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness for reasons other than an error or omission of an administrative or operational nature, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations.
	The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty has the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements.
	As of September 30, 2014, the termination value of derivatives in a net liability position related to these agreements was $2.5 million, which includes accrued interest but excludes any adjustment for nonperformance risk. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and as of September 30, 2014, the Company had posted $2.7 million in eligible collateral.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
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 September 30, 2014 and December 31, 2013, the Company had loan commitments totaling $475.4 million and $383.9 million, respectively, and standby letters of credit that totaled $7.2 million and $5.9 million, respectively. The total amounts of unused commitments do not necessarily represent future credit exposure or cash requirements, as commitments often expire without being drawn upon. However, the contractual amount of these commitments, offset by any additional collateral pledged, represents the Company’s potential credit loss exposure. Amounts funded under non-cancelable commitments in effect at the date of acquisition are covered under the applicable loss sharing agreements if certain conditions are met.
	Total unfunded commitments at September 30, 2014 and December 31, 2013 were as follows (in thousands):
		September 30, 2014						December 31, 2013
		Covered		Non-covered		Total		Covered		Non-covered		Total
	Commitments to fund loans
	Residential	$	—	$	2,015	$	2,015	$	—	$	1,303	$	1,303
	Commercial and commercial real estate	11		200,113		200,124		415		169,214		169,629
	Construction and land development	—		31,447		31,447		—		2,911		2,911
	Consumer	—		4,224		4,224		—		4,435		4,435
	Credit card lines of credit	—		18,733		18,733		—		17,322		17,322
	Unfunded commitments under lines of credit	7,895		210,961		218,856		13,162		175,177		188,339
	Commercial and standby letters of credit	234		6,929		7,163		443		5,487		5,930
	Total	$	8,140	$	474,422	$	482,562	$	14,020	$	375,849	$	389,869
	Commitments to fund loans—Commitments to fund loans are legally binding agreements to lend to clients in accordance with predetermined contractual provisions providing there have been no violations of any conditions specified in the contract. These commitments are generally at variable interest rates and are for specific periods or contain termination clauses and may require the payment of a fee. The total amounts of unused commitments are not necessarily representative of future credit exposure or cash requirements, as commitments often expire without being drawn upon.
	Credit card lines of credit—The Company extends lines of credit to clients through the use of credit cards issued by the Bank. These lines of credit represent the maximum amounts allowed to be funded, many of which will not exhaust the established limits, and as such, these amounts are not necessarily representations of future cash requirements or credit exposure.
	Unfunded commitments under lines of credit—In the ordinary course of business, the Company extends revolving credit to its clients. These arrangements may require the payment of a fee.
	Commercial and standby letters of credit—As a provider of financial services, the Company routinely issues commercial and standby letters of credit, which may be financial standby letters of credit or performance standby letters of credit. These are various forms of “back-up” commitments to guarantee the performance of a client to a third party. While these arrangements represent a potential cash outlay for the Company, the majority of these letters of credit will expire without being drawn upon. Letters of credit are subject to the same underwriting and credit approval process as traditional loans, and as such, many of them have various forms of collateral securing the commitment, which may include real estate, personal property, receivables or marketable securities.
	Contingencies
	In the ordinary course of business, the Company and the Bank may be subject to litigation. Based upon the available information and advice from the Company’s legal counsel, management does not believe that any potential, threatened or pending litigation to which it is a party will have a material adverse effect on the Company’s liquidity, financial condition or results of operations.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
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 nine months ended September 30, 2014 and 2013, there were no transfers of financial instruments between the hierarchy levels.
	The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of each instrument under the valuation hierarchy:
	Fair Value of Financial Instruments Measured on a Recurring Basis
	Investment securities available-for-sale—Investment securities available-for-sale are carried at fair value on a recurring basis. To the extent possible, observable quoted prices in an active market are used to determine fair value and, as such, these securities are classified as level 1. At September 30, 2014 and December 31, 2013, the Company did not hold any level 1 securities. When quoted market prices in active markets for identical assets or liabilities are not available, quoted prices of securities with similar characteristics, discounted cash flows or other pricing characteristics are used to estimate fair values and the securities are then classified as level 2. At September 30, 2014 and December 31, 2013, the Company’s level 2 securities included asset backed securities, 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 derrivative 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 of 8 comparable companies with publicly traded shares, and is deemed a significant unobservable input to the valuation model.
	Clawback liability—The Company periodically measures the net present value of expected future cash payments to be made by the Company 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.
	The tables below present the financial instruments measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013 on the consolidated statements of financial condition utilizing the hierarchy structure described above (in thousands):
		September 30, 2014
		Level 1			Level 2			Level 3		Total
	Assets:
	Investment securities available-for-sale:
	Asset backed securities	$	—		$	356		$	—	$	356
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			427,127			—		427,127
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			1,125,739			—		1,125,739
	Other securities	—			—			419		419
	Derivatives	—			738			—		738
	Total assets at fair value	$	—		$	1,553,960		$	419	$	1,554,379
	Liabilities:
	Warrant liability	$	—		$	—		$	3,547	$	3,547
	Clawback liability	—			—			35,120		35,120
	Derivatives	—			2,033			—		2,033
	Total liabilities at fair value	$	—		$	2,033		$	38,667	$	40,700
		December 31, 2013
		Level 1			Level 2			Level 3		Total
	Assets:
	Investment securities available-for-sale:
	Asset backed securities	$	—		$	4,537		$	—	$	4,537
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			494,990			—		494,990
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			1,285,582			—		1,285,582
	Other securities	—			—			419		419
	Derivatives	—			202			—		202
	Total assets at fair value	$	—		$	1,785,311		$	419	$	1,785,730
	Liabilities:
	Warrant liability	$	—		$	—		$	6,281	$	6,281
	Clawback liability	—			—			32,465		32,465
	Derivatives	—			74					74
	Total liabilities at fair value	$	—		$	74		$	38,746	$	38,820
	The table below details the changes in level 3 financial instruments during the nine months ended September 30, 2014 and September 30, 2013 (in thousands):
		Warrant			Clawback
		liability			liability
	Balance at December 31, 2012	$	5,461		$	31,271
	Change in value	138			(244		)
	Amortization	—			937
	Net change in level 3	$	138		$	693
	Balance at September 30, 2013	$	5,599		$	31,964
	Balance at December 31, 2013	$	6,281		$	32,465
	Change in value	(2,734		)	1,646
	Amortization	—			1,009
	Net change in Level 3	(2,734		)	2,655
	Balance at September 30, 2014	$	3,547		$	35,120
	Fair Value of Financial Instruments Measured on a Non-recurring Basis
	Certain assets may be recorded at fair value on a non-recurring basis as conditions warrant. These non-recurring fair value measurements typically result from the application of lower of cost or fair value accounting or a write-down occurring during the period.
	The Company records collateral dependent loans that are considered to be impaired at their estimated fair value. A loan is considered impaired when it is probable that the Company will be unable to collect all contractual amounts due in accordance with the terms of the loan agreement. Collateral dependent impaired loans are measured based on the fair value of the collateral. The Company relies on third-party appraisals and internal assessments in determining the estimated fair values of these loans. The inputs used to determine the fair values of loans are considered level 3 inputs in the fair value hierarchy. During the nine months ended September 30, 2014, the Company measured 24 loans not accounted for under ASC 310-30 at fair value on a non-recurring basis. These loans carried specific reserves totaling $0.2 million at September 30, 2014. During the nine months ended September 30, 2014, the Company added specific reserves of $0.3 million for seven loans with carrying balances of $2.5 million at September 30, 2014. The Company also eliminated specific reserves of $0.9 million for ten loans during the nine months ended September 30, 2014, primarily due to pay downs on these loans.
	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 the lower of the loan balance or the fair value of the collateral less estimated selling costs. The estimated fair values of OREO are updated periodically and further write-downs may be taken to reflect a new basis. The Company recognized $1.8 million of OREO impairments in its consolidated statements of operations during the nine months ended September 30, 2014, of which $1.1 million, or 60.2%, were on OREO that was covered by loss sharing agreements with the FDIC. During the nine months ended September 30, 2013, the Company recognized $9.1 million of OREO impairments in its consolidated statements of operations, of which $6.6 million, or 73.2% , were on OREO that was covered by loss sharing agreements with the FDIC. The fair values of OREO are derived from third party price opinions or appraisals that generally use an income approach or a market value approach. If reasonable comparable appraisals are not available, then the Company may use internally developed models to determine fair values. The inputs used to determine the fair values of OREO are considered level 3 inputs in the fair value hierarchy.
The table below provides information regarding the assets recorded at fair value on a non-recurring basis during the nine months ended September 30, 2014 and 2013 (in thousands):
	September 30, 2014
	Level 1			Level 2			Level 3		Total		Losses from fair value changes
Other real estate owned	$	—		$	—		$	45,885	$	45,885	$	1,789
Impaired loans	—			—			47,225		47,225		145
	30-Sep-13
	Level 1			Level 2			Level 3		Total		Losses from fair value changes
Other real estate owned	$	—		$	—		$	70,753	$	70,753	$	9,142
Impaired loans	—			—			29,075		29,075		1,305
The Company did not record any liabilities for which the fair value was made on a non-recurring basis during the nine months ended September 30, 2014.
The following table provides information about the valuation techniques and unobservable inputs used in the valuation of financial instruments falling within level 3 of the fair value hierarchy as of September 30, 2014. The table below excludes non-recurring fair value measurements of collateral value used for impairment measures for OREO. These valuations utilize third party appraisal or broker price opinions, and are classified as level 3 due to the significant judgment involved (in thousands):
	Fair value at			Valuation Technique		Unobservable Input	Quantitative
	September 30,						Measures
	2014
Other securities	$	419		Cash investment in private equity fund		Cash investment
Impaired loans	47,225			Appraised value		Appraised values
						Discount rate	0-25%
Clawback liability	35,120			Contractually defined discounted cash flows		Intrinsic loss estimates	$323.3 million -
							$405 million
						Expected credit losses	—
						Discount rate	4%
Warrant liability	3,547			Black-Scholes		Volatility	18%-36%

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2014
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 September 30, 2014 and December 31, 2013, including methods and assumptions utilized for determining fair value of financial instruments, are set forth below (in thousands):
			30-Sep-14				31-Dec-13
		Level in fair	Carrying		Estimated		Carrying		Estimated
		value	amount		fair value		amount		fair value
		measurement
		hierarchy
	ASSETS:
	Cash and cash equivalents	Level 1	$	118,659	$	118,659	$	189,460	$	189,460
	Asset backed securities available-for-sale	Level 2	356		356		4,537		4,537
	Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale	Level 2	427,127		427,127		494,990		494,990
	Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale	Level 2	1,125,739		1,125,739		1,285,582		1,285,582
	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	444,104		447,424		513,090		511,489
	Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	Level 2	113,360		110,169		128,817		124,916
	Capital stock of FHLB	Level 2	6,010		6,010		6,643		6,643
	Capital stock of FRB	Level 2	15,630		15,630		25,020		25,020
	Loans receivable, net	Level 3	2,154,781		2,194,983		1,841,573		1,923,888
	Loans held-for-sale	Level 2	5,252		5,252		5,787		5,787
	Accrued interest receivable	Level 2	12,851		12,851		11,355		11,355
	Derivatives	Level 2	738		738		202		202
	LIABILITIES:
	Deposit transaction accounts	Level 2	2,401,388		2,401,388		2,342,622		2,342,622
	Time deposits	Level 2	1,396,070		1,397,401		1,495,687		1,498,798
	Securities sold under agreements to repurchase	Level 2	109,946		109,946		99,547		99,547
	Due to FDIC	Level 3	35,120		35,120		41,882		41,882
	Warrant liability	Level 3	3,547		3,547		6,281		6,281
	Accrued interest payable	Level 2	3,607		3,607		3,058		3,058
	Derivatives	Level 2	2,033		2,033		74		74
	Cash and cash equivalents
	Cash and cash equivalents have a short-term nature and the estimated fair value is equal to the carrying value.
	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 are 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 rates offered by the Company, at the respective measurement dates, for deposits of similar remaining maturities.
	Derivative assets and liabilities
	Fair values for derivative assets and liabilities are fully described in note 16.
	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 18 of our audited 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.

Investment_Securities_Tables

Investment Securities - (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Available-for-sale Securities	'
	Available-for-sale investment securities are summarized as follows as of the dates indicated (in thousands):
		September 30, 2014
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Asset backed securities	$	356	$	—		$	—		$	356
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	419,852		8,089			(814		)	427,127
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	1,145,834		9,949			(30,044		)	1,125,739
	Other securities	419		—			—			419
	Total	$	1,566,461	$	18,038		$	(30,858	)	$	1,553,641
		December 31, 2013
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Asset backed securities	4,534		3			—			4,537
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	490,321		7,670			(3,001		)	494,990
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	1,320,998		10,764			(46,180		)	1,285,582
	Other securities	419		—			—			419
	Total	$	1,816,272	$	18,437		$	(49,181	)	$	1,785,528
Summary of Unrealized Losses	'
	The table below summarizes the unrealized losses as of the dates shown, along with the length of the impairment period (in thousands):
		September 30, 2014
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		value		losses			value			losses			value		losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	75,906	$	(274	)	$	110,728		$	(540	)	$	186,634	$	(814	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	107,699		(3,038		)	672,803			(27,006		)	780,502		(30,044		)
	Total	$	183,605	$	(3,312	)	$	783,531		$	(27,546	)	$	967,136	$	(30,858	)
		December 31, 2013
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		value		losses			value			losses			value		losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	283,177	$	(3,000	)	$	13		$	(1	)	$	283,190	$	(3,001	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	876,225		(44,101		)	40,740			(2,079		)	916,965		(46,180		)
	Total	$	1,159,402	$	(47,101	)	$	40,753		$	(2,080	)	$	1,200,155	$	(49,181	)
Held-to-maturity Securities	'
	Held-to-maturity investment securities are summarized as follows as of the dates indicated (in thousands):
		September 30, 2014
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	444,104	$	3,774		$	(454	)	$	447,424
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	113,360		202			(3,393		)	110,169
	Total investment securities held-to-maturity	$	557,464	$	3,976		$	(3,847	)	$	557,593
		December 31, 2013
		Amortized		Gross			Gross			Fair value
		cost		unrealized			unrealized
				gains			losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	513,090	$	175		$	(1,776	)	$	511,489
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	128,817		104			-4,005			124,916
	Total investment securities held-to-maturity	$	641,907	$	279		$	(5,781	)	$	636,405
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 (in thousands):
		September 30, 2014
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	—	$	—		$	37,164		$	(454	)	$	37,164	$	(454	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	10,289		(91		)	82,866			(3,302		)	93,155		(3,393		)
	Total	$	10,289	$	(91	)	$	120,030		$	(3,756	)	$	130,319	$	(3,847	)
		December 31, 2013
		Less than 12 months					12 months or more						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	$	472,973	$	(1,776	)	$	—		$	—		$	472,973	$	(1,776	)
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	105,124		(4,005		)	—			—			105,124		(4,005		)
	Total	$	578,097	$	(5,781	)	$	—		$	—		$	578,097	$	(5,781	)

Loans_Tables

Loans - (Tables)	9 Months Ended
	Sep. 30, 2014
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 on loans excluded from Accounting Standards Codification (“ASC”) Topic 310-30, and fees and costs of $11.7 million and $13.3 million as of September 30, 2014 and December 31, 2013, respectively (in thousands):
		September 30, 2014
		ASC 310-30			Non 310-30			Total loans		% of total
		loans			loans
	Commercial	$	37,665		$	717,507		$	755,172	34.8	%
	Agriculture	20,071			142,801			162,872		7.5	%
	Commercial real estate	213,871			380,445			594,316		27.4	%
	Residential real estate	43,979			579,420			623,399		28.7	%
	Consumer	5,007			30,606			35,613		1.6	%
	Total	$	320,593		$	1,850,779		$	2,171,372	100	%
	Covered	$	183,486		$	35,982		$	219,468	10.1	%
	Non-covered	137,107			1,814,797			1,951,904		89.9	%
	Total	$	320,593		$	1,850,779		$	2,171,372	100	%
		December 31, 2013
		ASC 310-30			Non 310-30			Total loans		% of total
		loans			loans
	Commercial	$	61,511		$	421,984		$	483,495	26.1	%
	Agriculture	27,000			132,952			159,952		8.6	%
	Commercial real estate	291,198			283,022			574,220		31	%
	Residential real estate	63,011			536,913			599,924		32.3	%
	Consumer	8,160			28,343			36,503		2	%
	Total	$	450,880		$	1,403,214		$	1,854,094	100	%
	Covered	$	259,364		$	50,033		$	309,397	16.7	%
	Non-covered	191,516			1,353,181			1,544,697		83.3	%
	Total	$	450,880		$	1,403,214		$	1,854,094	100	%
Past Due Financing Receivables	'
	Loan delinquency for all loans is shown in the following tables at September 30, 2014 and December 31, 2013, respectively (in thousands):
		Total Loans September 30, 2014
		30-59			60-89			Greater		Total  past		Current		Total		Loans > 90		Non-
		days  past			days			than 90		due				loans		days past		accrual
		due			past			days past								due and
					due			due								still
																accruing
	Loans excluded from ASC 310-30
	Commercial	$	2,063		$	314		$	189	$	2,566	$	714,941	$	717,507	$	77	$	12,203
	Agriculture	67			—			—		67		142,734		142,801		—		515
	Commercial real estate
	Construction	—			—			—		—		11,835		11,835		—		—
	Acquisition/development	42			—			—		42		4,553		4,595		—		—
	Multifamily	—			—			95		95		15,784		15,879		94		144
	Owner-occupied	78			89			289		456		122,023		122,479		—		946
	Non owner-occupied	1,961			—			203		2,164		223,493		225,657		—		203
	Total commercial real estate	2,081			89			587		2,757		377,688		380,445		94		1,293
	Residential real estate
	Senior lien	764			279			807		1,850		525,722		527,572		48		4,277
	Junior lien	269			112			18		399		51,449		51,848		—		417
	Total residential real estate	1,033			391			825		2,249		577,171		579,420		48		4,694
	Consumer	135			24			6		165		30,441		30,606		6		231
	Total loans excluded from ASC 310-30	$	5,379		$	818		$	1,607	$	7,804	$	1,842,975	$	1,850,779	$	225	$	18,936
	Covered loans excluded from ASC 310-30	$	78		$	188		$	30	$	296	$	35,686	$	35,982	$	—	$	1,540
	Non-covered loans excluded from ASC 310-30	5,301			630			1,577		7,508		1,807,289		1,814,797		225		17,396
	Total loans excluded from ASC 310-30	$	5,379		$	818		$	1,607	$	7,804	$	1,842,975	$	1,850,779	$	225	$	18,936
	Loans accounted for under ASC 310-30
	Commercial	$	400		$	—		$	4,981	$	5,381	$	32,284	$	37,665	$	4,981	$	—
	Agriculture	—			288			171		459		19,612		20,071		171		—
	Commercial real estate	3,878			25,013			35,870		64,761		149,110		213,871		35,870		—
	Residential real estate	879			156			1,757		2,792		41,187		43,979		1,757		—
	Consumer	147			—			151		298		4,709		5,007		151		—
	Total loans accounted for under ASC 310-30	$	5,304		$	25,457		$	42,930	$	73,691	$	246,902	$	320,593	$	42,930	$	—
	Covered loans accounted for under ASC 310-30	$	3,791		$	23,783		$	34,497	$	62,071	$	121,415	$	183,486	$	34,497	$	—
	Non-covered loans accounted for under ASC 310-30	1,513			1,674			8,433		11,620		125,487		137,107		8,433		—
	Total loans accounted for under ASC 310-30	$	5,304		$	25,457		$	42,930	$	73,691	$	246,902	$	320,593	$	42,930	$	—
	Total loans	$	10,683		$	26,275		$	44,537	$	81,495	$	2,089,877	$	2,171,372	$	43,155	$	18,936
	Covered loans	$	3,869		$	23,971		$	34,527	$	62,367	$	157,101	$	219,468	$	34,497	$	1,540
	Non-covered loans	6,814			2,304			10,010		19,128		1,932,776		1,951,904		8,658		17,396
	Total loans	$	10,683		$	26,275		$	44,537	$	81,495	$	2,089,877	$	2,171,372	$	43,155	$	18,936
		Total Loans December 31, 2013
		30-59			60-89			Greater		Total  past		Current		Total		Loans > 90		Non-
		days  past			days			than 90		due				loans		days past		accrual
		due			past			days past								due and
					due			due								still
																accruing
	Loans excluded from ASC 310-30
	Commercial	$	897		$	156		$	555	$	1,608	$	420,376	$	421,984	$	115	$	1,280
	Agriculture	188			7			—		195		132,757		132,952		—		153
	Commercial real estate
	Construction	316			—			—		316		5,023		5,339		—		—
	Acquisition/development	45			—			—		45		7,975		8,020		—		1
	Multifamily	1,003			—			—		1,003		9,681		10,684		—		1,096
	Owner-occupied	52			7			21		80		93,367		93,447		—		692
	Non owner-occupied	329			—			203		532		165,000		165,532		—		203
	Total commercial real estate	1,745			7			224		1,976		281,046		283,022		—		1,992
	Residential real estate
	Senior lien	733			415			1,062		2,210		482,381		484,591		—		5,326
	Junior lien	204			—			80		284		52,038		52,322		—		519
	Total residential real estate	937			415			1,142		2,494		534,419		536,913		—		5,845
	Consumer	191			21			23		235		28,108		28,343		14		247
	Total loans excluded from ASC 310-30	$	3,958		$	606		$	1,944	$	6,508	$	1,396,706	$	1,403,214	$	129	$	9,517
	Covered loans excluded from ASC 310-30	194			60			155		409		49,624		50,033		115		1,944
Non-covered loans excluded from ASC 310-30	3,764			546			1,789		6,099		1,347,082		1,353,181		14		7,573
Total loans excluded from ASC 310-30	$	3,958		$	606		$	1,944	$	6,508	$	1,396,706	$	1,403,214	$	129	$	9,517
Loans accounted for under ASC 310-30
Commercial	$	582		$	322		$	4,505	$	5,409	$	56,102	$	61,511	$	4,505	$	14,827
Agriculture	714			—			296		1,010		25,990		27,000		296		—
Commercial real estate	1,902			5,179			49,228		56,309		234,889		291,198		49,227		—
Residential real estate	977			977			1,817		3,771		59,240		63,011		1,817		—
Consumer	327			265			19		611		7,549		8,160		19		—
Total loans accounted for under ASC 310-30	$	4,502		$	6,743		$	55,865	$	67,110	$	383,770	$	450,880	$	55,864	$	14,827
Covered loans accounted for under ASC 310-30	$	1,471		$	4,949		$	42,356	$	48,776	$	210,588	$	259,364	$	42,355	$	14,827
Non-covered loans accounted for under ASC 310-30	3,031			1,794			13,509		18,334		173,182		191,516		13,509		—
Total loans accounted for under ASC 310-30	$	4,502		$	6,743		$	55,865	$	67,110	$	383,770	$	450,880	$	55,864	$	14,827
Total loans	$	8,460		$	7,349		$	57,809	$	73,618	$	1,780,476	$	1,854,094	$	55,993	$	24,344
Covered loans	$	1,665		$	5,009		$	42,511	$	49,185	$	260,212	$	309,397	$	42,470	$	16,771
Non-covered loans	6,795			2,340			15,298		24,433		1,520,264		1,544,697		13,523		7,573
Total loans	$	8,460		$	7,349		$	57,809	$	73,618	$	1,780,476	$	1,854,094	$	55,993	$	24,344
Credit Exposure for Loans as Determined by Company's Internal Risk Rating System	'
	Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows as of September 30, 2014 and December 31, 2013, respectively (in thousands):
		Total Loans September 30, 2014
		Pass			Special			Substandard		Doubtful		Total
					mention
	Loans excluded from ASC 310-30
	Commercial	$	686,475		$	2,973		$	28,022	$	37	$	717,507
	Agriculture	132,749			92			9,960		—		142,801
	Commercial real estate
	Construction	11,835			—			—		—		11,835
	Acquisition/development	4,595			—			—		—		4,595
	Multifamily	15,735			—			128		16		15,879
	Owner-occupied	117,256			161			5,062		—		122,479
	Non owner-occupied	204,212			17,788			3,647		10		225,657
	Total commercial real estate	353,633			17,949			8,837		26		380,445
	Residential real estate
	Senior lien	521,525			103			5,758		186		527,572
	Junior lien	50,513			—			1,335		—		51,848
	Total residential real estate	572,038			103			7,093		186		579,420
	Consumer	30,376			—			230		—		30,606
	Total loans excluded from ASC 310-30	$	1,775,271		$	21,117		$	54,142	$	249	$	1,850,779
	Covered loans excluded from ASC 310-30	$	21,300		$	2,404		$	12,154	$	124	$	35,982
	Non-covered loans excluded from ASC 310-30	1,753,971			18,713			41,988		125		1,814,797
	Total loans excluded from ASC 310-30	$	1,775,271		$	21,117		$	54,142	$	249	$	1,850,779
	Loans accounted for under ASC 310-30
	Commercial	$	13,101		$	348		$	23,682	$	534	$	37,665
	Agriculture	17,598			203			2,270		—		20,071
	Commercial real estate	87,361			4,067			118,453		3,990		213,871
	Residential real estate	30,066			1,447			12,466		—		43,979
	Consumer	4,310			114			583		—		5,007
	Total loans accounted for under ASC 310-30	$	152,436		$	6,179		$	157,454	$	4,524	$	320,593
	Covered loans accounted for under ASC 310-30	$	54,336		$	3,452		$	121,176	$	4,522	$	183,486
	Non-covered loans accounted for under ASC 310-30	98,100			2,727			36,278		2		137,107
	Total loans accounted for under ASC 310-30	$	152,436		$	6,179		$	157,454	$	4,524	$	320,593
	Total loans	$	1,927,707		$	27,296		$	211,596	$	4,773	$	2,171,372
	Total covered	$	75,636		$	5,856		$	133,330	$	4,646	$	219,468
	Total non-covered	1,852,071			21,440			78,266		127		1,951,904
	Total loans	$	1,927,707		$	27,296		$	211,596	$	4,773	$	2,171,372
		Total Loans December 31, 2013
		Pass			Special			Substandard		Doubtful		Total
					mention
	Loans excluded from ASC 310-30
	Commercial	$	374,281		$	9,882		$	37,414	$	407	$	421,984
	Agriculture	123,216			9,049			687		—		132,952
	Commercial real estate
	Construction	5,339			—			—		—		5,339
	Acquisition/development	1,366			2,247			4,407		—		8,020
	Multifamily	9,588			—			1,068		28		10,684
	Owner-occupied	87,984			169			5,294		—		93,447
	Non owner-occupied	142,159			18,536			4,837		—		165,532
	Total commercial real estate	246,436			20,952			15,606		28		283,022
	Residential real estate
	Senior lien	475,041			1,495			7,620		435		484,591
	Junior lien	49,874			200			2,248		—		52,322
	Total residential real estate	524,915			1,695			9,868		435		536,913
	Consumer	28,092			—			251		—		28,343
	Total loans excluded from ASC 310-30	$	1,296,940		$	41,578		$	63,826	$	870	$	1,403,214
	Covered loans excluded from ASC 310-30	$	22,175		$	3,439		$	24,005	$	414	$	50,033
	Non-covered loans excluded from ASC 310-30	1,274,765			38,139			39,821		456		1,353,181
	Total loans excluded from ASC 310-30	$	1,296,940		$	41,578		$	63,826	$	870	$	1,403,214
	Loans accounted for under ASC 310-30
	Commercial	$	23,129		$	3,221		$	34,440	$	721	$	61,511
	Agriculture	21,900			1,117			3,983		—		27,000
	Commercial real estate	115,903			12,493			157,748		5,054		291,198
Residential real estate	43,904			1,098			18,009		—		63,011
Consumer	6,921			244			995		—		8,160
Total loans accounted for under ASC 310-30	$	211,757		$	18,173		$	215,175	$	5,775	$	450,880
Covered loans accounted for under ASC 310-30	$	100,050		$	8,498		$	145,041	$	5,775	$	259,364
Non-covered loans accounted for under ASC 310-30	111,707			9,675			70,134		—		191,516
Total loans accounted for under ASC 310-30	$	211,757		$	18,173		$	215,175	$	5,775	$	450,880
Total loans	$	1,508,697		$	59,751		$	279,001	$	6,645	$	1,854,094
Total covered	$	122,225		$	11,937		$	169,046	$	6,189	$	309,397
Total non-covered	1,386,472			47,814			109,955		456		1,544,697
Total loans	$	1,508,697		$	59,751		$	279,001	$	6,645	$	1,854,094
Schedule Of Impaired Financing Receivable With And Without Related Allowance	'
	Additional information regarding impaired loans at September 30, 2014 and December 31, 2013 is set forth in the table below (in thousands):
		Impaired Loans
		September 30, 2014								December 31, 2013
		Unpaid			Recorded			Allowance		Unpaid		Recorded		Allowance
		principal			investment			for loan		principal		investment		for loan
		balance						losses		balance				losses
								allocated						allocated
	With no related allowance recorded:
	Commercial	$	25,111		$	24,974		$	—	$	4,981	$	4,981	$	—
	Agriculture	9,314			9,310			—		—		—		—
	Commercial real estate
	Construction	—			—			—		—		—		—
	Acquisition/development	—			—			—		—		—		—
	Multifamily	—			—			—		987		929		—
	Owner-occupied	1,746			1,514			—		1,872		1,655		—
	Non-owner occupied	—			—			—		561		488		—
	Total commercial real estate	1,746			1,514			—		3,420		3,072		—
	Residential real estate
	Senior lien	376			363			—		506		494		—
	Junior lien	—			—			—		—		—		—
	Total residential real estate	376			363			—		506		494		—
	Consumer	—			—			—		—		—		—
	Total impaired loans with no related allowance recorded	$	36,547		$	36,161		$	—	$	8,907	$	8,547	$	—
	With a related allowance recorded:
	Commercial	$	1,030		$	801		$	39	$	2,529	$	2,379	$	416
	Agriculture	181			150			—		191		173		1
	Commercial real estate
	Construction	—			—			—		—		—		—
	Acquisition/development	—			—			—		—		1		—
	Multifamily	161			144			16		178		168		28
	Owner-occupied	848			606			3		825		607		4
	Non-owner occupied	1,142			1,061			12		640		628		4
	Total commercial real estate	2,151			1,811			31		1,643		1,404		36
	Residential real estate
	Senior lien	7,479			6,575			210		8,147		7,266		474
	Junior lien	1,697			1,477			10		1,815		1,605		16
	Total residential real estate	9,176			8,052			220		9,962		8,871		490
	Consumer	280			250			3		290		273		3
	Total impaired loans with a related allowance recorded	$	12,818		$	11,064		$	293	$	14,615	$	13,100	$	946
	Total impaired loans	$	49,365		$	47,225		$	293	$	23,522	$	21,647	$	946
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 (in thousands):
		For the nine months ended
		30-Sep-14						30-Sep-13
		Average recorded investment			Interest income recognized			Average recorded investment		Interest income recognized
	With no related allowance recorded:
	Commercial	$	25,947		$	342		$	6,169	$	276
	Agriculture	9,045			217			—		—
	Commercial real estate
	Construction	—			—			—		—
	Acquisition/development	—			—			—		—
	Multifamily	—			—			958		—
	Owner-occupied	1,578			63			4,031		226
	Non owner-occupied	—			—			5,188		8
	Total commercial real estate	1,578			63			10,177		234
	Residential real estate
	Senior lien	391			8			752		6
	Junior lien	—			—			—		—
	Total residential real estate	391			8			752		6
	Consumer	—			—			—		—
	Total impaired loans with no related allowance recorded	$	36,961		$	630		$	17,098	$	516
	With a related allowance recorded:
	Commercial	$	987		$	6		$	2,744	$	53
	Agriculture	165			—			224		—
	Commercial real estate
	Construction	—			—			—		—
	Acquisition/development	—			—			1		—
	Multifamily	156			—			187		—
	Owner-occupied	627			10			668		11
	Non owner-occupied	1,086			42			636		14
	Total commercial real estate	1,869			52			1,492		25
	Residential real estate
	Senior lien	6,738			81			7,310		71
	Junior lien	1,515			45			1,736		40
	Total residential real estate	8,253			126			9,046		111
	Consumer	266			1			313		3
	Total impaired loans with a related allowance recorded	$	11,540		$	185		$	13,819	$	192
	Total impaired loans	$	48,501		$	815		$	30,917	$	708
Additional Information Related to Accruing TDR's	'
	The table below provides additional information related to accruing TDRs at September 30, 2014 and December 31, 2013 (in thousands):
		Accruing TDRs
		30-Sep-14
		Recorded			Average			Unpaid		Unfunded
		investment			year-to-			principal		commitments
					date			balance		to fund
					recorded					TDRs
					investment
	Commercial	$	12,573		$	12,131		$	12,573	$	840
	Agriculture	8,946			8,680			8,949		126
	Commercial real estate	620			631			632		—
	Residential real estate	2,877			2,932			2,902		2
	Consumer	20			21			20		—
	Total	$	25,036		$	24,395		$	25,076	$	968
		Accruing TDRs
		December 31, 2013
		Recorded			Average			Unpaid		Unfunded
		investment			year-to-			principal		commitments
					date			balance		to fund
					recorded					TDRs
					investment
	Commercial	$	6,079		$	7,113		$	6,084	$	144
	Agriculture	20			20			20		—
	Commercial real estate	2,484			2,759			2,743		—
	Residential real estate	2,995			3,055			3,023		12
	Consumer	27			30			27		12
	Total	$	11,605		$	12,977		$	11,897	$	168
Summary of Company's Carrying Value of Non-Accrual TDR's	'
	The following table summarizes the Company’s carrying value of non-accrual TDRs as of September 30, 2014 and December 31, 2013 (in thousands):
		Non - Accruing TDRs
		September 30, 2014						December 31, 2013
		Covered			Non-covered			Covered		Non-covered
	Commercial	$	1		$	429		$	—	$	535
	Agriculture	201			180			—		—
	Commercial real estate	246			470			296		98
	Residential real estate	945			996			1,377		1,031
	Consumer	—			199			—		237
	Total	$	1,393		$	2,274		$	1,673	$	1,901
Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield	'
	The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the nine months ended September 30, 2014 and 2013 (in thousands):
		September 30,			September 30,
		2014			2013
	Accretable yield beginning balance	$	130,624		$	133,585
	Reclassification from non-accretable difference	30,394			55,351
	Reclassification to non-accretable difference	(1,264		)	(5,234		)
	Accretion	(46,646		)	(59,616		)
	Accretable yield ending balance	$	113,108		$	124,086
Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30	'
	Below is the composition of the net book value for loans accounted for under ASC 310-30 at September 30, 2014 and December 31, 2013 (in thousands):
		September 30,			December 31,
		2014			2013
	Contractual cash flows	$	807,075		$	984,019
	Non-accretable difference	(373,374		)	(402,515		)
	Accretable yield	(113,108		)	(130,624		)
	Loans accounted for under ASC 310-30	$	320,593		$	450,880

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses - (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Summary of Company's Allowance for Loan Losses ("ALL") and Recorded Investment in Loans	'
	The tables below detail the Company’s allowance for loan losses (“ALL”) and recorded investment in loans as of and for the three and nine months ended September 30, 2014 and 2013 (in thousands):
		Three months ended September 30, 2014
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	6,421		$	1,407		$	2,969		$	4,310		$	465		$	15,572
	Non 310-30 beginning balance	6,420			610			2,735			4,244			465			14,474
	Charge-offs	(86		)	—			—			(470		)	(230		)	(786		)
	Recoveries	189			8			16			22			55			290
	Provision	859			102			166			338			241			1,706
	Non 310-30 ending balance	7,382			720			2,917			4,134			531			15,684
	ASC 310-30 beginning balance	1			797			234			66			—			1,098
	Charge-offs	—			—			—			—			—			—
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	—			(184		)	(7		)	—			—			(191		)
	ASC 310-30 ending balance	1			613			227			66			—			907
	Ending balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
		Three months ended September 30, 2013
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	2,286		$	764		$	2,419		$	5,907		$	471		$	11,847
	Non 310-30 beginning balance	2,240			495			2,113			4,333			471			9,652
	Charge-offs	(401		)	—			—			(117		)	(276		)	(794		)
	Recoveries	92			—			17			23			75			207
	Provision (recoupment)	715			27			(205		)	27			186			750
	Non 310-30 ending balance	2,646			522			1,925			4,266			456			9,815
	ASC 310-30 beginning balance	46			269			306			1,574			—			2,195
	Charge-offs	—			(221		)	—			(57		)	—			(278		)
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	43			537			(8		)	(885		)	—			(313		)
	ASC 310-30 ending balance	89			585			298			632			—			1,604
	Ending balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
		Nine months ended September 30, 2014
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	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	(498		)	—			—			(539		)	(585		)	(1,622		)
	Recoveries	306			8			70			197			205			786
	Provision	3,545			140			863			311			420			5,279
	Non 310-30 ending balance	7,382			720			2,917			4,134			531			15,684
	ASC 310-30 beginning balance	229			665			292			94			—			1,280
	Charge-offs	(2		)	—			—			—			(36		)	(38		)
	Recoveries	—			—			—			—			—			—
	Provision (recoupment)	(226		)	(52		)	(65		)	(28		)	36			(335		)
	ASC 310-30 ending balance	1			613			227			66			—			907
	Ending balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
	Ending allowance balance attributable to:
	Non 310-30 loans individually evaluated for impairment	$	39		$	—		$	31		$	220		$	3		$	293
	Non 310-30 loans collectively evaluated for impairment	7,343			720			2,886			3,914			528			15,391
	ASC 310-30 loans	1			613			227			66			—			907
	Total ending allowance balance	$	7,383		$	1,333		$	3,144		$	4,200		$	531		$	16,591
	Loans:
	Non 310-30 individually evaluated for impairment	$	25,776		$	9,460		$	3,325		$	8,415		$	250		$	47,226
	Non 310-30 collectively evaluated for impairment	691,731			133,341			377,120			571,005			30,356			1,803,553
	ASC 310-30 loans	37,665			20,071			213,871			43,979			5,007			320,593
	Total loans	$	755,172		$	162,872		$	594,316		$	623,399		$	35,613		$	2,171,372
		Nine months ended September 30, 2013
		Commercial			Agriculture			Commercial			Residential			Consumer			Total
								real estate			real estate
	Beginning balance	$	2,798		$	592		$	7,396		$	4,011		$	583		$	15,380
	Non 310-30 beginning balance	2,798			323			3,056			4,011			540			10,728
	Charge-offs	(1,654		)	—			(943		)	(741		)	(717		)	(4,055		)
	Recoveries	187			13			129			64			224			617
Provision (recoupment)	1,315			186			(317		)	932			409			2,525
Non 310-30 ending balance	2,646			522			1,925			4,266			456			9,815
ASC 310-30 beginning balance	—			269			4,340			—			43			4,652
Charge-offs	(407		)	(221		)	(2,796		)	(623		)	—			(4,047		)
Recoveries	—			—			—			—			—			—
Provision (recoupment)	496			537			(1,246		)	1,255			(43		)	999
ASC 310-30 ending balance	89			585			298			632			—			1,604
Ending balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
Ending allowance balance attributable to:
Non 310-30 loans individually evaluated for impairment	$	92		$	1		$	40		$	533		$	7		$	673
Non 310-30 loans collectively evaluated for impairment	2,554			521			1,885			3,733			449			9,142
ASC 310-30 loans	89			585			298			632			—			1,604
Total ending allowance balance	$	2,735		$	1,107		$	2,223		$	4,898		$	456		$	11,419
Loans:
Non 310-30 individually evaluated for impairment	$	7,670		$	223		$	11,258		$	9,629		$	295		$	29,075
Non 310-30 collectively evaluated for impairment	264,444			117,241			277,494			513,531			28,018			1,200,728
ASC 310-30 loans	68,250			37,882			325,701			72,409			8,768			513,010
Total loans	$	340,364		$	155,346		$	614,453		$	595,569		$	37,081		$	1,742,813

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset - (Tables)	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Summary of Activity Related to FDIC Indemnification Asset	'
	Below is a summary of the activity related to the FDIC indemnification asset during the nine months ended September 30, 2014 and 2013 (in thousands):
		For the nine months ended
		September 30,			September 30,
		2014			2013
	Balance at beginning of period	$	64,447		$	86,923
	Amortization	(19,819		)	(11,843		)
	FDIC portion of (recoveries) charge-offs exceeding fair value marks	(34		)	7,466
	Changes for FDIC loss share submissions	(181		)	(24,460		)
	Balance at end of period	$	44,413		$	58,086

Other_Real_Estate_Owned_Tables

Other Real Estate Owned - (Tables)	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Summary of Activity in OREO Balances	'
	A summary of the activity in the OREO balances during the nine months ended September 30, 2014 and 2013 is as follows (in thousands):
		For the nine months ended September 30,
		2014			2013
	Beginning balance	$	70,125		$	94,808
	Transfers from loan portfolio, at fair value	2,519			32,408
	Impairments	(1,789		)	(9,142		)
	Sales	(27,656		)	(54,705		)
	Gain on sale of OREO, net	2,686			7,384
	Ending balance	$	45,885		$	70,753

Regulatory_Capital_Tables

Regulatory Capital - (Tables)	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements	'
	At September 30, 2014 and December 31, 2013, NBH Bank, N.A. 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 (in thousands):
		September 30, 2014
		Actual				Required to be				Required to be
						considered well				considered
						capitalized (1)				adequately
										capitalized
		Ratio		Amount		Ratio		Amount		Ratio		Amount
	Tier 1 leverage ratio
	Consolidated	15.2	%	$	729,216	N/A		N/A		4	%	$	191,465
	NBH Bank, N.A.	11.9	%	568,864		10	%	$	476,688	4	%	190,675
	Tier 1 risk-based capital ratio (2)
	Consolidated	29.4	%	$	729,216	6	%	$	148,680	4	%	$	99,120
	NBH Bank, N.A.	23.1	%	568,864		11	%	270,429		4	%	98,338
	Total risk-based capital ratio (2)
	Consolidated	30.1	%	$	746,208	10	%	$	247,800	8	%	$	198,240
	NBH Bank, N.A.	23.8	%	585,856		12	%	295,014		8	%	196,676
		December 31, 2013
		Actual				Required to be				Required to be
						considered well				considered
						capitalized (1)				adequately
										capitalized
		Ratio		Amount		Ratio		Amount		Ratio		Amount
	Tier 1 leverage ratio
	Consolidated	16.6	%	$	822,688	N/A		N/A		4	%	$	197,906
	NBH Bank, N.A.	11.3	%	556,876		10	%	$	491,294	4	%	196,518
	Tier 1 risk-based capital ratio (2)
	Consolidated	38.9	%	$	822,688	6	%	$	126,865	4	%	$	84,577
	NBH Bank, N.A.	26.6	%	556,876		11	%	230,334		4	%	83,758
	Total risk-based capital ratio (2)
	Consolidated	39.5	%	$	835,810	10	%	$	211,442	8	%	$	169,153
	NBH Bank, N.A.	27.2	%	569,998		12	%	251,273		8	%	167,515
	-1	These ratio requirements for NBH Bank, N.A. are reflective of the agreements NBH Bank, N.A. has made with its various regulators 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 covered assets are risk-weighted at 20% for purposes of risk-based capital computations.

FDIC_Loss_Sharing_Income_Table

FDIC Loss Sharing Income - (Tables)	9 Months Ended
	Sep. 30, 2014
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 (expense) income during the three and nine months ended September 30, 2014 and 2013 (in thousands):
		For the three months ended						For the nine months ended
		September 30, 2014			September 30, 2013			September 30, 2014			September 30, 2013
	Clawback liability amortization	$	(345	)	$	(314	)	$	(1,009	)	$	(937	)
	Clawback liability remeasurement	(592		)	(405		)	(1,646		)	244
	Reimbursement to FDIC for gain on sale of and income from covered OREO	(1,587		)	(2,514		)	(3,287		)	(4,615		)
	Reimbursement to FDIC for recoveries	(62		)	—			(180		)	(22		)
	FDIC reimbursement of covered asset resolution costs	1,643			2,042			3,573			8,608
	Total	$	(943	)	$	(1,191	)	$	(2,549	)	$	3,278

Stockbased_Compensation_and_Em1

Stock-based Compensation and Employee Benefits - (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Option Activity	'
	The following table summarizes stock option activity for the nine months ended September 30, 2014:
		Options		Weighted		Weighted	Aggregate
				Average		Average	Intrinsic
				Exercise		Remaining	Value
				Price		Contractual
						Term in
						Years
	Outstanding at December 31, 2013	3,515,486		$	19.92	6.13	$	5,183,567
	Granted	114,148		18.93
	Forfeited	(4,360	)	18.36
	Surrendered	(9,705	)	20
	Exercised	(295	)	20
	Expired	(2,083	)	20
	Outstanding at September 30, 2014	3,613,191		$	19.89	5.53	$	168,864
	Options fully vested and exercisable at September 30, 2014	2,957,498		$	19.99	5.3	$	—
	Options expected to vest	611,407		$	19.5	6.39	$	142,375
Summary of Restricted Stock Activity	'
	The following table summarizes restricted stock activity for the nine months ended September 30, 2014:
		Total Restricted Shares		Weighted Average Grant-Date Fair Value
	Unvested at December 31, 2013	1,064,460		$	15.16
	Vested	(29,651	)	19.5
	Granted	147,086		18.98
	Forfeited	(13,780	)	14.58
	Surrendered	(18,610	)	19.16
	Unvested at September 30, 2014	1,149,505		$	15.48

Warrants_Tables

Warrants (Tables)	9 Months Ended
	Sep. 30, 2014
Warrants and Rights Note Disclosure [Abstract]	'
Schedule of Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model	'
	The fair value of the warrants was estimated using a Black-Scholes option pricing model utilizing the following assumptions at the indicated dates:
		September 30, 2014		December 31, 2013
	Risk-free interest rate	1.87	%	2.16	%
	Expected volatility	25.85	%	33.8	%
	Expected term (years)	6-May		7-Jun
	Dividend yield	1.05	%	0.93	%

Income_Per_Share_Tables

Income Per Share - (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Computation of Basic and Diluted Income Per Share	'
	The following table illustrates the computation of basic and diluted income per share for the three and nine months ended September 30, 2014 and 2013 (in thousands, except share and earnings per share information):
		For the three months ended						For the nine months ended
		September 30,			September 30,			September 30,			September 30,
		2014			2013			2014			2013
	Distributed earnings	$	2,159		$	2,622		$	6,666		$	7,934
	Undistributed earnings (distributions in excess of earnings)	1,178			(1,675		)	231			(2,007		)
	Net income	$	3,337		$	947		$	6,897		$	5,927
	Less: earnings allocated to participating securities	(12		)	(5		)	(28		)	(12		)
	Earnings allocated to common shareholders	$	3,325		$	942		$	6,869		$	5,915
	Weighted average shares outstanding for basic earnings per common share	41,837,485			51,454,200			43,403,791			51,940,245
	Dilutive effect of equity awards	4,200			45,301			19,482			32,916
	Dilutive effect of warrants	—			2,479			—			—
	Weighted average shares outstanding for diluted earnings per common share	41,841,685			51,501,980			43,423,273			51,973,161
	Basic earnings per share	$	0.08		$	0.02		$	0.16		$	0.11
	Diluted earnings per share	$	0.08		$	0.02		$	0.16		$	0.11

Derivatives_Tables

Derivatives - (Tables)	9 Months Ended
	Sep. 30, 2014
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 16.
				Asset Derivatives										Liability Derivatives
				Fair Value										Fair Value
		Balance Sheet Location		September 30, 2014				December 31, 2013				Balance Sheet Location		September 30, 2014			December 31, 2013
	Derivatives designated as hedging instruments
	Interest rate products	Other assets		$	17			$	129			Other liabilities		$	1,259		$	—
	Total derivatives designated as hedging instruments			$	17			$	129					$	1,259		$	—
	Derivatives not designated as hedging instruments
	Interest rate products	Other assets		$	721			$	73			Other liabilities		$	774		$	74
	Total derivatives not designated as hedging instruments			$	721			$	73					$	774		$	74
Derivative Instruments, Gain (Loss)	'
	The tables below present the effect of the Company’s derivative financial instruments on the consolidated statement of operations for the three and nine months ended September 30, 2014 and 2013 (in thousands).
	Derivatives in fair value hedging relationships		Location of loss recognized in income on derivatives		Amount of loss recognized in income on derivatives
					Three months ended September 30,								For the nine months ended September 30,
					2014				2013				2014			2013
	Interest rate products		Interest income		$	(36	)		$	—			$	(1,371	)	$	—
	Total				$	(36	)		$	—			$	(1,371	)	$	—
	Derivatives in fair value hedging relationships		Location of gain or (loss) recognized in income on derivatives		Amount of gain or (loss) recognized in income on hedged items
					Three months ended September 30,								For the nine months ended September 30,
					2014				2013				2014			2013
	Interest rate products		Interest income		$	(10	)		$	—			$	1,185		$	—
	Total				$	(10	)		$	—			$	1,185		$	—
					Amount of loss recognized in income on derivatives
					Three months ended September 30,								For the nine months ended September 30,
	Derivatives not designated as hedging instruments		Location of loss recognized in income on derivatives		2014				2013				2014			2013
	Interest rate products		Other non-interest income		$	(1	)		$	(7	)		$	(51	)	(7	)
	Total				$	(1	)		$	(7	)		$	(51	)	(7	)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Total Unfunded Commitments	'
	Total unfunded commitments at September 30, 2014 and December 31, 2013 were as follows (in thousands):
		September 30, 2014						December 31, 2013
		Covered		Non-covered		Total		Covered		Non-covered		Total
	Commitments to fund loans
	Residential	$	—	$	2,015	$	2,015	$	—	$	1,303	$	1,303
	Commercial and commercial real estate	11		200,113		200,124		415		169,214		169,629
	Construction and land development	—		31,447		31,447		—		2,911		2,911
	Consumer	—		4,224		4,224		—		4,435		4,435
	Credit card lines of credit	—		18,733		18,733		—		17,322		17,322
	Unfunded commitments under lines of credit	7,895		210,961		218,856		13,162		175,177		188,339
	Commercial and standby letters of credit	234		6,929		7,163		443		5,487		5,930
	Total	$	8,140	$	474,422	$	482,562	$	14,020	$	375,849	$	389,869

Fair_Value_Measurements_Tables

Fair Value Measurements - (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Tables of Financial Instruments Measured At Fair Value on Recurring Basis	'
	The tables below present the financial instruments measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013 on the consolidated statements of financial condition utilizing the hierarchy structure described above (in thousands):
		September 30, 2014
		Level 1			Level 2			Level 3		Total
	Assets:
	Investment securities available-for-sale:
	Asset backed securities	$	—		$	356		$	—	$	356
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			427,127			—		427,127
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			1,125,739			—		1,125,739
	Other securities	—			—			419		419
	Derivatives	—			738			—		738
	Total assets at fair value	$	—		$	1,553,960		$	419	$	1,554,379
	Liabilities:
	Warrant liability	$	—		$	—		$	3,547	$	3,547
	Clawback liability	—			—			35,120		35,120
	Derivatives	—			2,033			—		2,033
	Total liabilities at fair value	$	—		$	2,033		$	38,667	$	40,700
		December 31, 2013
		Level 1			Level 2			Level 3		Total
	Assets:
	Investment securities available-for-sale:
	Asset backed securities	$	—		$	4,537		$	—	$	4,537
	Mortgage-backed securities (“MBS”):
	Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			494,990			—		494,990
	Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises	—			1,285,582			—		1,285,582
	Other securities	—			—			419		419
	Derivatives	—			202			—		202
	Total assets at fair value	$	—		$	1,785,311		$	419	$	1,785,730
	Liabilities:
	Warrant liability	$	—		$	—		$	6,281	$	6,281
	Clawback liability	—			—			32,465		32,465
	Derivatives	—			74					74
	Total liabilities at fair value	$	—		$	74		$	38,746	$	38,820
Table of Changes in Level 3 Financial Instruments	'
	The table below details the changes in level 3 financial instruments during the nine months ended September 30, 2014 and September 30, 2013 (in thousands):
		Warrant			Clawback
		liability			liability
	Balance at December 31, 2012	$	5,461		$	31,271
	Change in value	138			(244		)
	Amortization	—			937
	Net change in level 3	$	138		$	693
	Balance at September 30, 2013	$	5,599		$	31,964
	Balance at December 31, 2013	$	6,281		$	32,465
	Change in value	(2,734		)	1,646
	Amortization	—			1,009
	Net change in Level 3	(2,734		)	2,655
	Balance at September 30, 2014	$	3,547		$	35,120
Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy	'
	The table below provides information regarding the assets recorded at fair value on a non-recurring basis during the nine months ended September 30, 2014 and 2013 (in thousands):
		September 30, 2014
		Level 1			Level 2			Level 3		Total		Losses from fair value changes
	Other real estate owned	$	—		$	—		$	45,885	$	45,885	$	1,789
	Impaired loans	—			—			47,225		47,225		145
		30-Sep-13
		Level 1			Level 2			Level 3		Total		Losses from fair value changes
	Other real estate owned	$	—		$	—		$	70,753	$	70,753	$	9,142
	Impaired loans	—			—			29,075		29,075		1,305
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 September 30, 2014. The table below excludes non-recurring fair value measurements of collateral value used for impairment measures for OREO. These valuations utilize third party appraisal or broker price opinions, and are classified as level 3 due to the significant judgment involved (in thousands):
		Fair value at			Valuation Technique		Unobservable Input	Quantitative
		September 30,						Measures
		2014
	Other securities	$	419		Cash investment in private equity fund		Cash investment
	Impaired loans	47,225			Appraised value		Appraised values
							Discount rate	0-25%
	Clawback liability	35,120			Contractually defined discounted cash flows		Intrinsic loss estimates	$323.3 million -
								$405 million
							Expected credit losses	—
							Discount rate	4%
	Warrant liability	3,547			Black-Scholes		Volatility	18%-36%

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments - (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
			30-Sep-14				31-Dec-13
		Level in fair	Carrying		Estimated		Carrying		Estimated
		value	amount		fair value		amount		fair value
		measurement
		hierarchy
	ASSETS:
	Cash and cash equivalents	Level 1	$	118,659	$	118,659	$	189,460	$	189,460
	Asset backed securities available-for-sale	Level 2	356		356		4,537		4,537
	Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale	Level 2	427,127		427,127		494,990		494,990
	Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale	Level 2	1,125,739		1,125,739		1,285,582		1,285,582
	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	444,104		447,424		513,090		511,489
	Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	Level 2	113,360		110,169		128,817		124,916
	Capital stock of FHLB	Level 2	6,010		6,010		6,643		6,643
	Capital stock of FRB	Level 2	15,630		15,630		25,020		25,020
	Loans receivable, net	Level 3	2,154,781		2,194,983		1,841,573		1,923,888
	Loans held-for-sale	Level 2	5,252		5,252		5,787		5,787
	Accrued interest receivable	Level 2	12,851		12,851		11,355		11,355
	Derivatives	Level 2	738		738		202		202
	LIABILITIES:
	Deposit transaction accounts	Level 2	2,401,388		2,401,388		2,342,622		2,342,622
	Time deposits	Level 2	1,396,070		1,397,401		1,495,687		1,498,798
	Securities sold under agreements to repurchase	Level 2	109,946		109,946		99,547		99,547
	Due to FDIC	Level 3	35,120		35,120		41,882		41,882
	Warrant liability	Level 3	3,547		3,547		6,281		6,281
	Accrued interest payable	Level 2	3,607		3,607		3,058		3,058
	Derivatives	Level 2	2,033		2,033		74		74

Basis_of_Presentation_Details

Basis of Presentation - (Details)	9 Months Ended
	Sep. 30, 2014
	banking_center
Accounting Policies [Abstract]	'
Number Of Full Service Banking Offices	97

Investment_Securities_Narrativ

Investment Securities - (Narrative) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Investments Schedule [Abstract]	'	'
Investment securities total	$2,111,105,000	$2,427,435,000
Available-for-sale securities	1,553,641,000	1,785,528,000
Held-to-maturity securities	557,464,000	641,907,000
Mortgage-backed securities as percentage of available-for-sale investment portfolio	99.90%	99.70%
Fair value of available-for-sale investment securities pledged as collateral	272,100,000	177,600,000
Estimated weighted average life of the available-for-sale mortgage-backed securities portfolio	'3 years 7 months 18 days	'3 years 10 months 17 days
Held-to-maturity investment securities pledged as collateral	$63,600,000	$68,500,000
Estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio	'3 years 6 months 15 days	'3 years 9 months 27 days

Investment_Securities_Summary_

Investment Securities - (Summary of Available-for-Sale Investment Securities) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	$1,566,461	$1,816,272
Gross unrealized gains	18,038	18,437
Gross unrealized losses	-30,858	-49,181
Investment securities available-for-sale (at fair value)	1,553,641	1,785,528
Asset Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	356	4,534
Gross unrealized gains	0	3
Gross unrealized losses	0	0
Investment securities available-for-sale (at fair value)	356	4,537
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	419,852	490,321
Gross unrealized gains	8,089	7,670
Gross unrealized losses	-814	-3,001
Investment securities available-for-sale (at fair value)	427,127	494,990
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	1,145,834	1,320,998
Gross unrealized gains	9,949	10,764
Gross unrealized losses	-30,044	-46,180
Investment securities available-for-sale (at fair value)	1,125,739	1,285,582
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_Summary_1

Investment Securities - (Summary of Unrealized Losses) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 months Fair Value	$183,605	$1,159,402
Less than 12 months Unrealized Losses	-3,312	-47,101
12 months or more, Fair Value	783,531	40,753
12 months or more, Unrealized Losses	-27,546	-2,080
Total, Fair Value	967,136	1,200,155
Total Unrealized losses	-30,858	-49,181
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	75,906	283,177
Less than 12 months Unrealized Losses	-274	-3,000
12 months or more, Fair Value	110,728	13
12 months or more, Unrealized Losses	-540	-1
Total, Fair Value	186,634	283,190
Total Unrealized losses	-814	-3,001
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	107,699	876,225
Less than 12 months Unrealized Losses	-3,038	-44,101
12 months or more, Fair Value	672,803	40,740
12 months or more, Unrealized Losses	-27,006	-2,079
Total, Fair Value	780,502	916,965
Total Unrealized losses	($30,044)	($46,180)

Investment_Securities_Summary_2

Investment Securities - (Summary of Held-to-maturity Investment Securities) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-maturity Securities	$557,464	$641,907
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	3,976	279
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-3,847	-5,781
Fair value	557,593	636,405
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	444,104	513,090
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	3,774	175
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-454	-1,776
Fair value	447,424	511,489
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	113,360	128,817
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	202	104
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-3,393	-4,005
Fair value	$110,169	$124,916

Investment_Securities_Summary_3

Investment Securities - (Summary of Held-to-Maturity Securities, Unrealized Losses) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]	'	'
Fair Value, Less than 12 months	$10,289	$578,097
Unrealized Losses, Less than 12 months	-91	-5,781
Fair Value, 12 months or more	120,030	0
Unrealized Losses, 12 months or more	-3,756	0
Total Fair Value	130,319	578,097
Total Unrealized Losses	-3,847	-5,781
Residential Mortgage Backed Agency [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Fair Value, Less than 12 months	0	472,973
Unrealized Losses, Less than 12 months	0	-1,776
Fair Value, 12 months or more	37,164	0
Unrealized Losses, 12 months or more	-454	0
Total Fair Value	37,164	472,973
Total Unrealized Losses	-454	-1,776
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	10,289	105,124
Unrealized Losses, Less than 12 months	-91	-4,005
Fair Value, 12 months or more	82,866	0
Unrealized Losses, 12 months or more	-3,302	0
Total Fair Value	93,155	105,124
Total Unrealized Losses	($3,393)	($4,005)

Loans_Narrative_Section_Detail

Loans - Narrative Section (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Debt Instrument [Line Items]	'	'	'
Covered Loans Percentage	10.10%	16.70%	'
Fees and cost related to loans	$11,700,000	$13,300,000	'
Carrying amount of loan investments	2,171,372,000	1,854,094,000	1,742,813,000
Commercial Loan [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Carrying amount of loan investments	755,172,000	483,495,000	'
Non Accrual [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	18,936,000	9,517,000	'
ASC 310-30 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Carrying amount of loan investments	320,593,000	450,880,000	'
ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Carrying amount of loan investments	37,665,000	61,511,000	'
ASC 310-30 [Member] | Accruing [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Carrying amount of loan investments	13,200,000	'	'
Covered [Member] | ASC 310-30 [Member] | Non Accrual [Member] | Commercial And Industrial Loan [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	$0	$14,827,000	'

Loans_Impaired_Loans_Narrative

Loans - Impaired Loans Narrative (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
In Thousands, unless otherwise specified			Discounted Cash Flows [Member]	Fair Value Of Collateral Pledged [Member]	General Reserve [Member]	Covered [Member]	Covered [Member]	Commercial Loan [Member]
								SecurityLoan
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Impaired loans	$8,600	'	$24,500	$14,200	$250	'	'	'
Recorded investment of impaired loans	47,225	21,647	'	'	'	'	'	'
Impaired loans which were covered by FDIC loss sharing agreement	'	309,397	'	'	'	11,800	7,700	'
Number of loans resulting in increase to impaired loans	'	'	'	'	'	'	'	2
Collective related allowance for loan losses for impaired loans	293	946	'	'	'	'	'	'
Impaired loan, fully secured and current as to principal and interest payments	'	'	'	'	'	'	'	11,500
Impaired loan, covered by loss-share and current as to principal and interest payments	'	'	'	'	'	'	'	$7,400

Loans_Loan_Portfolio_Compositi

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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'	'
Total Loans	$2,171,372	$1,854,094	$1,742,813
Covered Loans Percentage	10.10%	16.70%	'
% of Total	100.00%	100.00%	'
Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	219,468	309,397	'
Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,951,904	1,544,697	'
% of Total	89.90%	83.30%	'
Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	755,172	483,495	'
% of Total	34.80%	26.10%	'
Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	162,872	159,952	'
% of Total	7.50%	8.60%	'
Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	594,316	574,220	'
% of Total	27.40%	31.00%	'
Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	623,399	599,924	'
% of Total	28.70%	32.30%	'
Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	35,613	36,503	'
% of Total	1.60%	2.00%	'
Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,850,779	1,403,214	'
Non ASC 310-30 [Member] | Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	35,982	50,033	'
Non ASC 310-30 [Member] | Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,814,797	1,353,181	'
Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	717,507	421,984	'
Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	142,801	132,952	'
Non ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	380,445	283,022	'
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	579,420	536,913	'
Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	30,606	28,343	'
ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	320,593	450,880	'
ASC 310-30 [Member] | Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	183,486	259,364	'
ASC 310-30 [Member] | Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	137,107	191,516	'
ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	37,665	61,511	'
ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	20,071	27,000	'
ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	213,871	291,198	'
ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	43,979	63,011	'
ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	$5,007	$8,160	'

Loans_Loan_Delinquency_Detail

Loans - (Loan Delinquency) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'	'
Total loans	$2,171,372	$1,854,094	$1,742,813
Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	755,172	483,495	'
Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	162,872	159,952	'
Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	594,316	574,220	'
Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	623,399	599,924	'
Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	35,613	36,503	'
Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	1,850,779	1,403,214	'
Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	717,507	421,984	'
Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	142,801	132,952	'
Non ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	380,445	283,022	'
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	579,420	536,913	'
Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	30,606	28,343	'
ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	320,593	450,880	'
ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	37,665	61,511	'
ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	20,071	27,000	'
ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	213,871	291,198	'
ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	43,979	63,011	'
ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	5,007	8,160	'
Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	219,468	309,397	'
Covered [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	35,982	50,033	'
Covered [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	183,486	259,364	'
Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	1,951,904	1,544,697	'
Non-Covered [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	1,814,797	1,353,181	'
Non-Covered [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total loans	137,107	191,516	'
Total Loans [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	10,683	8,460	'
60-89 days past due	26,275	7,349	'
Greater than 90 days past due	44,537	57,809	'
Total past due	81,495	73,618	'
Current	2,089,877	1,780,476	'
Total loans	2,171,372	1,854,094	'
Loans 90 days past due and still accruing	43,155	55,993	'
Non- accrual	18,936	24,344	'
Total Loans [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	5,379	3,958	'
60-89 days past due	818	606	'
Greater than 90 days past due	1,607	1,944	'
Total past due	7,804	6,508	'
Current	1,842,975	1,396,706	'
Total loans	1,850,779	1,403,214	'
Loans 90 days past due and still accruing	225	129	'
Non- accrual	18,936	9,517	'
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	0	316	'
60-89 days past due	0	0	'
Greater than 90 days past due	0	0	'
Total past due	0	316	'
Current	11,835	5,023	'
Total loans	11,835	5,339	'
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	42	45	'
60-89 days past due	0	0	'
Greater than 90 days past due	0	0	'
Total past due	42	45	'
Current	4,553	7,975	'
Total loans	4,595	8,020	'
Loans 90 days past due and still accruing	0	0	'
Non- accrual	0	1	'
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	0	1,003	'
60-89 days past due	0	0	'
Greater than 90 days past due	95	0	'
Total past due	95	1,003	'
Current	15,784	9,681	'
Total loans	15,879	10,684	'
Loans 90 days past due and still accruing	94	0	'
Non- accrual	144	1,096	'
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	78	52	'
60-89 days past due	89	7	'
Greater than 90 days past due	289	21	'
Total past due	456	80	'
Current	122,023	93,367	'
Total loans	122,479	93,447	'
Loans 90 days past due and still accruing	0	0	'
Non- accrual	946	692	'
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	1,961	329	'
60-89 days past due	0	0	'
Greater than 90 days past due	203	203	'
Total past due	2,164	532	'
Current	223,493	165,000	'
Total loans	225,657	165,532	'
Loans 90 days past due and still accruing	0	0	'
Non- accrual	203	203	'
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	2,081	1,745	'
60-89 days past due	89	7	'
Greater than 90 days past due	587	224	'
Total past due	2,757	1,976	'
Current	377,688	281,046	'
Total loans	380,445	283,022	'
Loans 90 days past due and still accruing	94	0	'
Non- accrual	1,293	1,992	'
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	764	733	'
60-89 days past due	279	415	'
Greater than 90 days past due	807	1,062	'
Total past due	1,850	2,210	'
Current	525,722	482,381	'
Total loans	527,572	484,591	'
Loans 90 days past due and still accruing	48	0	'
Non- accrual	4,277	5,326	'
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	269	204	'
60-89 days past due	112	0	'
Greater than 90 days past due	18	80	'
Total past due	399	284	'
Current	51,449	52,038	'
Total loans	51,848	52,322	'
Loans 90 days past due and still accruing	0	0	'
Non- accrual	417	519	'
Total Loans [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	78	194	'
60-89 days past due	188	60	'
Greater than 90 days past due	30	155	'
Total past due	296	409	'
Current	35,686	49,624	'
Total loans	35,982	50,033	'
Loans 90 days past due and still accruing	0	115	'
Non- accrual	1,540	1,944	'
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	5,301	3,764	'
60-89 days past due	630	546	'
Greater than 90 days past due	1,577	1,789	'
Total past due	7,508	6,099	'
Current	1,807,289	1,347,082	'
Total loans	1,814,797	1,353,181	'
Loans 90 days past due and still accruing	225	14	'
Non- accrual	17,396	7,573	'
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	2,063	897	'
60-89 days past due	314	156	'
Greater than 90 days past due	189	555	'
Total past due	2,566	1,608	'
Current	714,941	420,376	'
Total loans	717,507	421,984	'
Loans 90 days past due and still accruing	77	115	'
Non- accrual	12,203	1,280	'
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	67	188	'
60-89 days past due	0	7	'
Greater than 90 days past due	0	0	'
Total past due	67	195	'
Current	142,734	132,757	'
Total loans	142,801	132,952	'
Loans 90 days past due and still accruing	0	0	'
Non- accrual	515	153	'
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	1,033	937	'
60-89 days past due	391	415	'
Greater than 90 days past due	825	1,142	'
Total past due	2,249	2,494	'
Current	577,171	534,419	'
Total loans	579,420	536,913	'
Loans 90 days past due and still accruing	48	0	'
Non- accrual	4,694	5,845	'
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	135	191	'
60-89 days past due	24	21	'
Greater than 90 days past due	6	23	'
Total past due	165	235	'
Current	30,441	28,108	'
Total loans	30,606	28,343	'
Loans 90 days past due and still accruing	6	14	'
Non- accrual	231	247	'
Total Loans [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	5,304	4,502	'
60-89 days past due	25,457	6,743	'
Greater than 90 days past due	42,930	55,865	'
Total past due	73,691	67,110	'
Current	246,902	383,770	'
Total loans	320,593	450,880	'
Loans 90 days past due and still accruing	42,930	55,864	'
Non- accrual	0	14,827	'
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	400	582	'
60-89 days past due	0	322	'
Greater than 90 days past due	4,981	4,505	'
Total past due	5,381	5,409	'
Current	32,284	56,102	'
Total loans	37,665	61,511	'
Loans 90 days past due and still accruing	4,981	4,505	'
Non- accrual	0	14,827	'
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	0	714	'
60-89 days past due	288	0	'
Greater than 90 days past due	171	296	'
Total past due	459	1,010	'
Current	19,612	25,990	'
Total loans	20,071	27,000	'
Loans 90 days past due and still accruing	171	296	'
Non- accrual	0	0	'
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	3,878	1,902	'
60-89 days past due	25,013	5,179	'
Greater than 90 days past due	35,870	49,228	'
Total past due	64,761	56,309	'
Current	149,110	234,889	'
Total loans	213,871	291,198	'
Loans 90 days past due and still accruing	35,870	49,227	'
Non- accrual	0	0	'
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	879	977	'
60-89 days past due	156	977	'
Greater than 90 days past due	1,757	1,817	'
Total past due	2,792	3,771	'
Current	41,187	59,240	'
Total loans	43,979	63,011	'
Loans 90 days past due and still accruing	1,757	1,817	'
Non- accrual	0	0	'
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	147	327	'
60-89 days past due	0	265	'
Greater than 90 days past due	151	19	'
Total past due	298	611	'
Current	4,709	7,549	'
Total loans	5,007	8,160	'
Loans 90 days past due and still accruing	151	19	'
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	3,791	1,471	'
60-89 days past due	23,783	4,949	'
Greater than 90 days past due	34,497	42,356	'
Total past due	62,071	48,776	'
Current	121,415	210,588	'
Total loans	183,486	259,364	'
Loans 90 days past due and still accruing	34,497	42,355	'
Non- accrual	0	14,827	'
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	1,513	3,031	'
60-89 days past due	1,674	1,794	'
Greater than 90 days past due	8,433	13,509	'
Total past due	11,620	18,334	'
Current	125,487	173,182	'
Total loans	137,107	191,516	'
Loans 90 days past due and still accruing	8,433	13,509	'
Non- accrual	0	0	'
Total Loans [Member] | Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	3,869	1,665	'
60-89 days past due	23,971	5,009	'
Greater than 90 days past due	34,527	42,511	'
Total past due	62,367	49,185	'
Current	157,101	260,212	'
Total loans	219,468	309,397	'
Loans 90 days past due and still accruing	34,497	42,470	'
Non- accrual	1,540	16,771	'
Total Loans [Member] | Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	6,814	6,795	'
60-89 days past due	2,304	2,340	'
Greater than 90 days past due	10,010	15,298	'
Total past due	19,128	24,433	'
Current	1,932,776	1,520,264	'
Total loans	1,951,904	1,544,697	'
Loans 90 days past due and still accruing	8,658	13,523	'
Non- accrual	17,396	7,573	'
Total Loans [Member] | Covered And Non-covered [Member]	'	'	'
Loans [Line Items]	'	'	'
30-59 days past due	10,683	8,460	'
60-89 days past due	26,275	7,349	'
Greater than 90 days past due	44,537	57,809	'
Total past due	81,495	73,618	'
Current	2,089,877	1,780,476	'
Total loans	2,171,372	1,854,094	'
Loans 90 days past due and still accruing	43,155	55,993	'
Non- accrual	$18,936	$24,344	'

Loans_Credit_Exposure_for_Loan

Loans - (Credit Exposure for Loans as Determined by Company's Internal Risk Rating System) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'	'
Total Loans	$2,171,372	$1,854,094	$1,742,813
Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	162,872	159,952	'
Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	623,399	599,924	'
Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	35,613	36,503	'
Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	755,172	483,495	'
Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	594,316	574,220	'
Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,850,779	1,403,214	'
Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	142,801	132,952	'
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	579,420	536,913	'
Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	30,606	28,343	'
Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	717,507	421,984	'
Non ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	380,445	283,022	'
ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	320,593	450,880	'
ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	20,071	27,000	'
ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	43,979	63,011	'
ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	5,007	8,160	'
ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	37,665	61,511	'
ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	213,871	291,198	'
Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	219,468	309,397	'
Covered [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	35,982	50,033	'
Covered [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	183,486	259,364	'
Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,951,904	1,544,697	'
Non-Covered [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,814,797	1,353,181	'
Non-Covered [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	137,107	191,516	'
Total Loans [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	2,171,372	1,854,094	'
Total Loans [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,850,779	1,403,214	'
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	11,835	5,339	'
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,595	8,020	'
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	15,879	10,684	'
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	122,479	93,447	'
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	225,657	165,532	'
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	380,445	283,022	'
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	142,801	132,952	'
Total Loans [Member] | Non ASC 310-30 [Member] | Sr lien [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	527,572	484,591	'
Total Loans [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	51,848	52,322	'
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	579,420	536,913	'
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	30,606	28,343	'
Total Loans [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	35,982	50,033	'
Total Loans [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,814,797	1,353,181	'
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	717,507	421,984	'
Total Loans [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	320,593	450,880	'
Total Loans [Member] | ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	20,071	27,000	'
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	43,979	63,011	'
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	5,007	8,160	'
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	37,665	61,511	'
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	213,871	291,198	'
Total Loans [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	183,486	259,364	'
Total Loans [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	137,107	191,516	'
Total Loans [Member] | Pass [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,927,707	1,508,697	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,775,271	1,296,940	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	11,835	5,339	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,595	1,366	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Multifamily [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	15,735	9,588	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	117,256	87,984	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	204,212	142,159	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	353,633	246,436	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	132,749	123,216	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Sr lien [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	521,525	475,041	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	50,513	49,874	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	572,038	524,915	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	30,376	28,092	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	21,300	22,175	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,753,971	1,274,765	'
Total Loans [Member] | Pass [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	686,475	374,281	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	152,436	211,757	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	17,598	21,900	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	30,066	43,904	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,310	6,921	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	13,101	23,129	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	87,361	115,903	'
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	54,336	100,050	'
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	98,100	111,707	'
Total Loans [Member] | Special Mention [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	27,296	59,751	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	21,117	41,578	'
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	2,247	'
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	161	169	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	17,788	18,536	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	17,949	20,952	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	92	9,049	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Sr lien [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	103	1,495	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	0	200	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	103	1,695	'
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	2,404	3,439	'
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	18,713	38,139	'
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	2,973	9,882	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	6,179	18,173	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	203	1,117	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,447	1,098	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	114	244	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	348	3,221	'
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,067	12,493	'
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	3,452	8,498	'
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	2,727	9,675	'
Total Loans [Member] | Substandard [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	211,596	279,001	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	54,142	63,826	'
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	4,407	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Multifamily [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	128	1,068	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	5,062	5,294	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	3,647	4,837	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	8,837	15,606	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	9,960	687	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Sr lien [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	5,758	7,620	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Jr Liens [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,335	2,248	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	7,093	9,868	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	230	251	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	12,154	24,005	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	41,988	39,821	'
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	28,022	37,414	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	157,454	215,175	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Agriculture [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	2,270	3,983	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	12,466	18,009	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	583	995	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	23,682	34,440	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	118,453	157,748	'
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	121,176	145,041	'
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	36,278	70,134	'
Total Loans [Member] | Doubtful [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,773	6,645	'
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	249	870	'
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	16	28	'
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	10	0	'
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	26	28	'
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	186	435	'
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	186	435	'
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	124	414	'
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Non-covered loans excluded from ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	125	456	'
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	37	407	'
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,524	5,775	'
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	534	721	'
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	3,990	5,054	'
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,522	5,775	'
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member] | Non-covered loans accounted for under ASC Topic 310-30 [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	2	0	'
Total Loans [Member] | Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	219,468	309,397	'
Total Loans [Member] | Covered [Member] | Pass [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	75,636	122,225	'
Total Loans [Member] | Covered [Member] | Special Mention [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	5,856	11,937	'
Total Loans [Member] | Covered [Member] | Substandard [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	133,330	169,046	'
Total Loans [Member] | Covered [Member] | Doubtful [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	4,646	6,189	'
Total Loans [Member] | Non-Covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,951,904	1,544,697	'
Total Loans [Member] | Non-Covered [Member] | Pass [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,852,071	1,386,472	'
Total Loans [Member] | Non-Covered [Member] | Special Mention [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	21,440	47,814	'
Total Loans [Member] | Non-Covered [Member] | Substandard [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	78,266	109,955	'
Total Loans [Member] | Non-Covered [Member] | Doubtful [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	127	456	'
Total Loans [Member] | Covered And Non-covered [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	2,171,372	1,854,094	'
Total Loans [Member] | Covered And Non-covered [Member] | Pass [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	1,927,707	1,508,697	'
Total Loans [Member] | Covered And Non-covered [Member] | Special Mention [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	27,296	59,751	'
Total Loans [Member] | Covered And Non-covered [Member] | Substandard [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	211,596	279,001	'
Total Loans [Member] | Covered And Non-covered [Member] | Doubtful [Member]	'	'	'
Loans [Line Items]	'	'	'
Total Loans	$4,773	$6,645	'

Loans_Additional_Information_R

Loans - (Additional Information Regarding Impaired Loans) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'
Unpaid principal balance, Total	$49,365	$23,522
Recorded Investment In Acquired Impaired Loans	47,225	21,647
Loans and Leases Receivable, Allowance	293	946
Commercial Loan [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	25,111	4,981
Recorded investment with no related allowance recorded	24,974	4,981
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	1,030	2,529
Recorded investment of impaired loans with an allowance recorded	801	2,379
Allowance for loan losses allocated with an allowance recorded	39	416
Agriculture [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	9,314	0
Recorded investment with no related allowance recorded	9,310	0
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	181	191
Recorded investment of impaired loans with an allowance recorded	150	173
Allowance for loan losses allocated with an allowance recorded	0	1
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	1
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	987
Recorded investment with no related allowance recorded	0	929
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	161	178
Recorded investment of impaired loans with an allowance recorded	144	168
Allowance for loan losses allocated with an allowance recorded	16	28
Owner-Occupied [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	1,746	1,872
Recorded investment with no related allowance recorded	1,514	1,655
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	848	825
Recorded investment of impaired loans with an allowance recorded	606	607
Allowance for loan losses allocated with an allowance recorded	3	4
Non Owner-Occupied [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	0	561
Recorded investment with no related allowance recorded	0	488
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	1,142	640
Recorded investment of impaired loans with an allowance recorded	1,061	628
Allowance for loan losses allocated with an allowance recorded	12	4
Total Commercial Real Estate [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	1,746	3,420
Recorded investment with no related allowance recorded	1,514	3,072
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	2,151	1,643
Recorded investment of impaired loans with an allowance recorded	1,811	1,404
Allowance for loan losses allocated with an allowance recorded	31	36
Sr Lien 1-4 Family Closed End [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	376	506
Recorded investment with no related allowance recorded	363	494
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	7,479	8,147
Recorded investment of impaired loans with an allowance recorded	6,575	7,266
Allowance for loan losses allocated with an allowance recorded	210	474
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	1,697	1,815
Recorded investment of impaired loans with an allowance recorded	1,477	1,605
Allowance for loan losses allocated with an allowance recorded	10	16
Residential Real Estate Segment [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	376	506
Recorded investment with no related allowance recorded	363	494
Allowance for loan losses allocated with no related allowance recorded	0	0
Unpaid principal balance of impaired loans with an allowance recorded	9,176	9,962
Recorded investment of impaired loans with an allowance recorded	8,052	8,871
Allowance for loan losses allocated with an allowance recorded	220	490
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	280	290
Recorded investment of impaired loans with an allowance recorded	250	273
Allowance for loan losses allocated with an allowance recorded	3	3
Impaired Loans With No Related Allowance Recorded [Member] [Member]	'	'
Loans [Line Items]	'	'
Unpaid principal balance with no related allowance recorded	36,547	8,907
Recorded investment with no related allowance recorded	36,161	8,547
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	12,818	14,615
Recorded investment of impaired loans with an allowance recorded	11,064	13,100
Allowance for loan losses allocated with an allowance recorded	$293	$946

Loans_Impaired_Loans_Average_R

Loans (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Loans [Line Items]	'	'
Impaired Financing Receivable, Average Recorded Investment	$48,501	$30,917
Impaired Financing Receivable, Interest Income, Cash Basis Method	815	708
Commercial Loan [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	25,947	6,169
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	342	276
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	987	2,744
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	6	53
Agriculture [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,045	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	217	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	165	224
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	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	1
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	958
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	156	187
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	1,578	4,031
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	63	226
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	627	668
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	10	11
Non Owner-Occupied [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	5,188
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	8
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,086	636
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	42	14
Total Commercial Real Estate [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,578	10,177
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	63	234
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,869	1,492
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	52	25
Sr Lien 1-4 Family Closed End [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	391	752
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,738	7,310
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	81	71
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	1,515	1,736
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	45	40
Residential Real Estate Segment [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	391	752
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,253	9,046
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	126	111
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	266	313
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	3
Impaired Loans With No Related Allowance Recorded [Member] [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	36,961	17,098
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	630	516
Impaired Loans with Related Allowance Recorded [Member]	'	'
Loans [Line Items]	'	'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,540	13,819
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$185	$192

Loans_Troubled_Debt_Restructur

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) (USD $)

9 Months Ended

9 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

SecurityLoan

SecurityLoan

Troubled Debt Restructurings [Member]

Troubled Debt Restructurings [Member]

Troubled Debt Restructurings [Member]

FDIC Covered [Member]

FDIC Covered [Member]

Commercial And Industrial Loan and Consumer Loan [Member]

Commercial And Industrial Loan and Consumer Loan [Member]

Accrual Status [Member]

Accrual Status [Member]

Covered Loan [Member]

Covered Loan [Member]

Covered Loan [Member]

Covered Loan [Member]

SecurityLoan

Non Accrual [Member]

Non Accrual [Member]

Non Accrual Status [Member]

Non Accrual Status [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretable yield related for loan pool

$113,108,000

$124,086,000

$130,624,000

$133,585,000

'

'

'

'

'

'

'

'

'

'

'

'

'

TDRbs modified within the past year that defaulted on their restructured terms

3

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accruing troubled debt restructurings

'

'

'

'

'

'

'

9,200,000

5,700,000

'

'

'

'

'

'

'

'

Carrying amount of loan investments

2,171,372,000

1,742,813,000

1,854,094,000

'

'

3,700,000

3,600,000

'

'

'

'

'

'

219,468,000

309,397,000

'

'

Troubled Debt Restructuring Nonaccrual Loans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,393,000

1,673,000

Number of restructured loans

'

'

'

'

14

'

'

'

'

'

'

'

'

'

'

'

'

Recorded investment

'

'

'

'

20,400,000

'

'

'

'

'

'

25,036,000

11,605,000

'

'

'

'

Financing Receivable, Modifications, Subsequent Default, Recorded Investment

'

'

'

'

'

'

'

'

'

$37,000

$328,000

'

'

'

'

'

'

Loans_Additional_Information_R1

Loans - (Additional Information Related to Accruing TDR's) (Detail) (Accruing TDR [Member], USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Loans [Line Items]	'	'
Recorded investment	$25,036	$11,605
Average year-to- date recorded investment	24,395	12,977
Unpaid principal balance	25,076	11,897
Unfunded commitments to fund TDRs	968	168
Commercial [Member]	'	'
Loans [Line Items]	'	'
Recorded investment	12,573	6,079
Average year-to- date recorded investment	12,131	7,113
Unpaid principal balance	12,573	6,084
Unfunded commitments to fund TDRs	840	144
Agriculture [Member]	'	'
Loans [Line Items]	'	'
Recorded investment	8,946	20
Average year-to- date recorded investment	8,680	20
Unpaid principal balance	8,949	20
Unfunded commitments to fund TDRs	126	0
Commercial Real Estate [Member]	'	'
Loans [Line Items]	'	'
Recorded investment	620	2,484
Average year-to- date recorded investment	631	2,759
Unpaid principal balance	632	2,743
Unfunded commitments to fund TDRs	0	0
Residential Real Estate Segment [Member]	'	'
Loans [Line Items]	'	'
Recorded investment	2,877	2,995
Average year-to- date recorded investment	2,932	3,055
Unpaid principal balance	2,902	3,023
Unfunded commitments to fund TDRs	2	12
Consumer [Member]	'	'
Loans [Line Items]	'	'
Recorded investment	20	27
Average year-to- date recorded investment	21	30
Unpaid principal balance	20	27
Unfunded commitments to fund TDRs	$0	$12

Loans_Summary_of_Companys_Carr

Loans - (Summary of Company's Carrying Value of Non-Accrual TDR's) (Detail) (Non-Accruing TDR [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Covered [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	$1,393	$1,673
Covered [Member] | Commercial [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	1	0
Covered [Member] | Agriculture [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	201	0
Covered [Member] | Commercial Real Estate [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	246	296
Covered [Member] | Residential Real Estate Segment [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	945	1,377
Covered [Member] | Consumer [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	0	0
Non-Covered [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	2,274	1,901
Non-Covered [Member] | Commercial [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	429	535
Non-Covered [Member] | Agriculture [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	180	0
Non-Covered [Member] | Commercial Real Estate [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	470	98
Non-Covered [Member] | Residential Real Estate Segment [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	996	1,031
Non-Covered [Member] | Consumer [Member]	'	'
Loans [Line Items]	'	'
Carrying Value of Non - Accruing TDRbs	$199	$237

Loans_ReMeasurement_of_Loans_A

Loans - (Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield) (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'	'
Accretable yield beginning balance	$130,624	$133,585
Reclassification from non-accretable difference	30,394	55,351
Reclassification to non-accretable difference	-1,264	-5,234
Accretion	-46,646	-59,616
Accretable yield ending balance	$113,108	$124,086

Loans_Composition_of_Net_Book_

Loans - (Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Receivables [Abstract]	'	'
Contractual cash flows	$807,075	$984,019
Non-accretable difference	-373,374	-402,515
Accretable yield	-113,108	-130,624
Loans accounted for under ASC 310-30	$320,593	$450,880

Allowance_for_Loan_Losses_Summ

Allowance for Loan Losses - (Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans) (Detail) (USD $)

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Commercial Portfolio Segment [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Agriculture [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Commercial Real Estate Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Residential Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Consumer Portfolio Segment [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

Non ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

ASC 310-30 [Member]

Allowance for Loan and Lease Losses [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance

$12,521

$15,380

$15,572

'

$11,847

$14,474

$9,652

$11,241

$10,728

'

$1,098

$2,195

$1,280

$4,652

'

$7,383

$6,421

$4,258

$2,735

$2,286

$2,798

$6,420

$2,240

$4,029

$2,798

'

$1

$46

$229

$0

$1,333

$1,407

$1,237

$1,107

$764

$592

$610

$495

$572

$323

$797

$269

$665

$269

$3,144

$2,969

$2,276

$2,223

$2,419

$7,396

$2,735

$2,113

$1,984

$3,056

$234

$306

$292

$4,340

$4,310

$5,907

$4,259

$4,011

$4,244

$4,333

$4,165

$4,011

$66

$1,574

$94

$0

$531

$465

$491

$456

$471

$583

$465

$471

$491

$540

$0

$0

$0

$43

Charge-offs

'

'

'

'

'

-786

-794

-1,622

-4,055

'

0

-278

-38

-4,047

'

'

'

'

'

'

'

-86

-401

-498

-1,654

'

0

0

-2

-407

'

'

'

'

'

'

0

0

0

0

0

-221

0

-221

'

'

'

'

'

'

0

0

0

-943

0

0

0

-2,796

'

'

'

'

-470

-117

-539

-741

0

-57

0

-623

'

'

'

'

'

'

-230

-276

-585

-717

0

0

-36

0

Recoveries

'

'

'

'

'

290

207

786

617

'

0

0

0

0

'

'

'

'

'

'

'

189

92

306

187

'

0

0

0

0

'

'

'

'

'

'

8

0

8

13

0

0

0

0

'

'

'

'

'

'

16

17

70

129

0

0

0

0

'

'

'

'

22

23

197

64

0

0

0

0

'

'

'

'

'

'

55

75

205

224

0

0

0

0

Provision for loan losses

4,944

3,524

'

'

'

1,706

750

5,279

2,525

'

-191

-313

-335

999

'

'

'

'

'

'

'

859

715

3,545

1,315

'

0

43

-226

496

'

'

'

'

'

'

102

27

140

186

-184

537

'

537

'

'

'

'

'

'

166

-205

863

-317

-7

-8

-65

1,246

0

-885

-28

1,255

338

27

311

932

'

'

'

'

'

'

'

'

'

'

241

186

420

409

0

0

36

-43

Ending balance

16,591

11,419

15,572

'

11,847

15,684

9,815

15,684

9,815

'

907

1,604

907

1,604

'

7,383

6,421

4,258

2,735

2,286

2,798

7,382

2,646

7,382

2,646

'

1

89

1

89

1,333

1,407

1,237

1,107

764

592

720

522

720

522

613

585

613

585

3,144

2,969

2,276

2,223

2,419

7,396

2,917

1,925

2,917

1,925

227

298

227

298

4,200

4,898

4,200

4,898

4,134

4,266

4,134

4,266

66

632

66

632

531

465

491

456

471

583

531

456

531

456

0

0

0

0

Ending allowance balance individually evaluated for impairment

'

'

'

'

'

293

673

293

673

'

'

'

'

'

'

'

'

'

'

'

'

39

'

39

'

92

'

'

'

'

'

'

'

'

'

'

0

1

0

1

'

'

'

'

'

'

'

'

'

'

31

40

31

40

'

'

'

'

'

'

'

'

220

533

220

533

'

'

'

'

'

'

'

'

'

'

3

7

3

7

'

'

'

'

Ending allowance balance collectively evaluated for impairment

'

'

'

'

'

15,391

9,142

15,391

9,142

'

'

'

'

'

'

'

'

'

'

'

'

7,343

2,554

7,343

2,554

'

'

'

'

'

'

'

'

'

'

'

720

521

720

521

'

'

'

'

'

'

'

'

'

'

2,886

1,885

2,886

1,885

'

'

'

'

'

'

'

'

3,914

3,733

3,914

3,733

'

'

'

'

'

'

'

'

'

'

528

449

528

449

'

'

'

'

Ending allowance balance

'

'

'

'

'

'

'

'

'

'

907

1,604

907

1,604

'

'

'

'

'

'

'

'

'

'

'

'

1

89

1

89

'

'

'

'

'

'

'

'

'

'

613

585

613

585

'

'

'

'

'

'

'

'

'

'

227

298

227

298

'

'

'

'

'

'

'

'

66

632

66

632

'

'

'

'

'

'

'

'

'

'

0

0

0

0

Total ending allowance balance

16,591

11,419

15,572

'

11,847

15,684

9,815

15,684

9,815

'

907

1,604

907

1,604

'

7,383

6,421

4,258

2,735

2,286

2,798

7,382

2,646

7,382

2,646

'

1

89

1

89

1,333

1,407

1,237

1,107

764

592

720

522

720

522

613

585

613

585

3,144

2,969

2,276

2,223

2,419

7,396

2,917

1,925

2,917

1,925

227

298

227

298

4,200

4,898

4,200

4,898

4,134

4,266

4,134

4,266

66

632

66

632

531

465

491

456

471

583

531

456

531

456

0

0

0

0

Loans individually evaluated for impairment

'

'

'

'

'

47,226

29,075

47,226

29,075

'

'

'

'

'

'

'

'

'

'

'

'

25,776

7,670

25,776

7,670

'

'

'

'

'

'

'

'

'

'

'

9,460

223

9,460

223

'

'

'

'

'

'

'

'

'

'

3,325

11,258

3,325

11,258

'

'

'

'

'

'

'

'

8,415

9,629

8,415

9,629

'

'

'

'

'

'

'

'

'

'

250

295

250

295

'

'

'

'

Loans collectively evaluated for impairment

'

'

'

'

'

1,803,553

1,200,728

1,803,553

1,200,728

'

'

'

'

'

'

'

'

'

'

'

'

691,731

264,444

691,731

264,444

'

'

'

'

'

'

'

'

'

'

'

133,341

117,241

133,341

117,241

'

'

'

'

'

'

'

'

'

'

377,120

277,494

377,120

277,494

'

'

'

'

'

'

'

'

571,005

513,531

571,005

513,531

'

'

'

'

'

'

'

'

'

'

30,356

28,018

30,356

28,018

'

'

'

'

Loans

'

'

'

'

'

'

'

'

'

'

320,593

513,010

320,593

513,010

'

'

'

'

'

'

'

'

'

'

'

'

37,665

68,250

37,665

68,250

'

'

'

'

'

'

'

'

'

'

20,071

37,882

20,071

37,882

'

'

'

'

'

'

'

'

'

'

213,871

325,701

213,871

325,701

'

'

'

'

'

'

'

'

43,979

72,409

43,979

72,409

'

'

'

'

'

'

'

'

'

'

5,007

8,768

5,007

8,768

Total Loans

$2,171,372

$1,742,813

'

$1,854,094

'

$1,850,779

'

$1,850,779

'

$1,403,214

$320,593

'

$320,593

'

$450,880

$755,172

'

'

$340,364

'

'

'

'

'

'

'

'

'

'

'

$162,872

'

'

$155,346

'

'

'

'

'

'

'

'

'

'

$594,316

'

'

$614,453

'

'

'

'

'

'

'

'

'

'

$623,399

$595,569

$623,399

$595,569

'

'

'

'

'

'

'

'

$35,613

'

'

$37,081

'

'

'

'

'

'

'

'

'

'

Allowance_for_Loan_Losses_Narr

Allowance for Loan Losses - (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	'	'	($4,944,000)	($3,524,000)
Non ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Allowance for Loan and Lease Losses Write-offs, Net	-496,000	-600,000	-836,000	-3,400,000
Allowance for Doubtful Accounts Receivable, Write-offs	'	400,000	'	1,700,000
Provision for loan losses	-1,706,000	-750,000	-5,279,000	-2,525,000
ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	191,000	313,000	335,000	-999,000
Commercial Portfolio Segment [Member] | Non ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	-859,000	-715,000	-3,545,000	-1,315,000
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	0	-43,000	226,000	-496,000
Commercial Loan [Member] | ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	'	'	52,000	'
Residential Portfolio Segment [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	0	885,000	28,000	-1,255,000
Residential Portfolio Segment [Member] | Non ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	-338,000	-27,000	-311,000	-932,000
Agriculture [Member] | Non ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	-102,000	-27,000	-140,000	-186,000
Agriculture [Member] | ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	184,000	-537,000	'	-537,000
Commercial Real Estate Portfolio Segment [Member] | Non ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	-166,000	205,000	-863,000	317,000
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Provision for loan losses	$7,000	$8,000	$65,000	($1,246,000)

FDIC_Indemnification_Asset_Sum

FDIC Indemnification Asset - (Summary of Activity Related to FDIC Indemnification Asset) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
FDIC Indemnification Asset [Roll Forward]	'	'	'	'
Balance at beginning of period	'	'	$64,447	$86,923
Amortization	-6,252	-4,208	-19,819	-11,843
FDIC portion of (recoveries) charge-offs exceeding fair value marks	'	'	-34	7,466
Change in carrying value of indemnification asset due to loss share submissions	'	'	-181	-24,460
Balance at end of period	$44,413	$58,086	$44,413	$58,086

FDIC_Indemnification_Asset_Nar

FDIC Indemnification Asset - (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Banking and Thrift [Abstract]	'	'	'	'
Amortization	($6,252,000)	($4,208,000)	($19,819,000)	($11,843,000)
Decrease in carrying value of FDIC indemnification asset	'	'	-181,000	-24,460,000
Payments/receipts to/from FDIC related to loss share assets	'	'	$180,800	$77,000,000

Other_Real_Estate_Owned_Summar

Other Real Estate Owned - (Summary of Activity in OREO Balances) (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Other Real Estate [Roll Forward]	'	'
Balance	$70,125	$94,808
Transfers from loan portfolio, at fair value	2,519	32,408
Impairments	-1,789	-9,142
Sales	-27,656	-54,705
Gain on sale of OREO, net	2,686	7,384
Balance	$45,885	$70,753

Other_Real_Estate_Owned_Narrat

Other Real Estate Owned - (Narrative) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]	'	'	'	'
OREO balance	$45,885,000	$70,125,000	$70,753,000	$94,808,000
Interests of several outside participating banks	0	4,200,000	'	'
Minority interests in OREO which are held by outside banks	8,500,000	10,600,000	'	'
Percentage covered by the loss sharing agreements with the FDIC	65.70%	55.40%	'	'
Amount covered by the loss sharing agreements with the FDIC	$30,100,000	$38,800,000	'	'

Regulatory_Capital_Capital_Rat

Regulatory Capital - (Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
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	15.20%	16.60%
Risk-based capital Ratio	29.40%	38.90%
Total risk-based capital Ratio	30.10%	39.50%
Leverage Amount	$729,216	$822,688
Risk-based capital amount	729,216	822,688
Total risk-based capital Amount	746,208	835,810
Required to be considered well capitalized Ratio, risk-based capital ratio	6.00%	6.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio	10.00%	10.00%
Required to be considered well capitalized risk-based capital Amount	148,680	126,865
Required to be considered well capitalized Total risk-based capital Amount	247,800	211,442
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	4.00%	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	191,465	197,906
Required to be considered adequately capitalized risk-based capital Amount	99,120	84,577
Required to be considered adequately capitalized Total risk-based capital Amount	198,240	169,153
NBH Bank, N.A. [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Leverage Ratio	11.90%	11.30%
Risk-based capital Ratio	23.10%	26.60%
Total risk-based capital Ratio	23.80%	27.20%
Leverage Amount	568,864	556,876
Risk-based capital amount	568,864	556,876
Total risk-based capital Amount	585,856	569,998
Required to be considered well capitalized Ratio, leverage ratio	10.00%	10.00%
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 leverage Amount	476,688	491,294
Required to be considered well capitalized risk-based capital Amount	270,429	230,334
Required to be considered well capitalized Total risk-based capital Amount	295,014	251,273
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	8.00%	8.00%
Required to be considered adequately capitalized leverage Amount	190,675	196,518
Required to be considered adequately capitalized risk-based capital Amount	98,338	83,758
Required to be considered adequately capitalized Total risk-based capital Amount	$196,676	$167,515

FDIC_Loss_Sharing_Income_Sched

FDIC Loss Sharing Income - (Schedule of Additional Details of Company's FDIC Loss Sharing Income) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Banking and Thrift [Abstract]	'	'	'	'
Clawback liability amortization	($345)	($314)	($1,009)	($937)
Clawback liability remeasurement	-592	-405	-1,646	244
Reimbursement to FDIC for gain on sale of and income from covered OREO	-1,587	-2,514	-3,287	-4,615
Reimbursement to FDIC for recoveries	-62	0	-180	-22
FDIC reimbursement of covered asset resolution costs	1,643	2,042	3,573	8,608
Total	($943)	($1,191)	($2,549)	$3,278

Stockbased_Compensation_and_Em2

Stock-based Compensation and Employee Benefits - (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Number of shares authorized	4,519,533	'	4,519,533	'
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	$0.30	$0.50	$1	$1.80
Unrecognized compensation expense	1	'	1	'
Unrecognized compensation cost, weighted-average period, years	'	'	'0 years 10 months 24 days	'
Restricted Stock [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	0.8	0.8	1.8	2.2
Unrecognized compensation expense	$2.50	'	$2.50	'
Unrecognized compensation cost, weighted-average period, years	'	'	'8 months 9 days	'

Stockbased_Compensation_and_Em3

Stock-based Compensation and Employee Benefits - (Summary of Option Activity) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Outstanding Options, beginning	3,515,486	'	3,538,012
Granted, Options	114,148	'	'
Forfeited, Options	-4,360	'	'
Surrendered, Options	-9,705	'	'
Exercised, Options	-295	'	'
Expired, Options	-2,083	'	'
Outstanding Options, ending	3,613,191	3,515,486	3,538,012
Outstanding, Weighted Average Exercise Price, beginning	$19.92	'	$19.92
Granted, Weighted Average Exercise Price	$18.93	'	'
Forfeited, Weighted Average Exercise Price	$18.36	'	'
Surrendered, Weighted Average Exercise Price	$20	'	'
Exercised, Weighted Average Exercise Price	$20	'	'
Expired, Weighted Average Exercise Price	$20	'	'
Outstanding, Weighted Average Exercised Price, ending	$19.89	$19.92	$19.92
Outstanding, Weighted Average Remaining Contractual Term in Years, beginning	'5 years 6 months 11 days	'6 years 1 month 17 days	'
Outstanding, Weighted Average Remaining Contractual Term in Years, ending	'5 years 6 months 11 days	'6 years 1 month 17 days	'
Outstanding, Aggregate Intrinsic Value, beginning	$5,183,567	'	'
Outstanding, Aggregate Intrinsic Value, ending	168,864	5,183,567	'
Options fully vested and exercisable at September 30, 2014, Options	2,957,498	'	'
Options expected to vest, Options	611,407	'	'
Options fully vested and exercisable at September 30, 2014, Weighted Average Exercise Price	$19.99	'	'
Options expected to vest, Weighted Average Exercise Price	$19.50	'	'
Options fully vested and exercisable at September 30, 2014, weighted average remaining contractual term in years	'5 years 3 months 18 days	'	'
Options expected to vest, Weighted Average Remaining Contractual Term in Years	'6 years 4 months 21 days	'	'
Aggregate intrinsic Value of Options fully vested and exercisable at September 30, 2014	0	'	'
Options expected to vest, Aggregate Intrinsic Value	$142,375	'	'

Stockbased_Compensation_and_Em4

Stock-based Compensation and Employee Benefits - (Summary of Restricted Stock Activity) (Details) (Restricted Stock [Member], Common Class A [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Restricted Stock [Member] | Common Class A [Member]	'
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)	1,064,460
Unvested Restricted Shares, Vested (in shares)	-29,651
Unvested Restricted Shares, Granted (in shares)	147,086
Unvested Restricted Shares, Forfeited (in shares)	-13,780
Unvested Restricted Shares, Surrendered (in shares)	-18,610
Unvested Restricted Shares, Ending (in shares)	1,149,505
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)	$19.50
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	$18.98
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share)	$14.58
Weighted Average Grant-Date, Fair Value, Surrendered (in dollars per share)	$19.16
Weighted Average Grant-Date Fair Value, Ending (in dollars per share)	$15.48

Warrants_Narrative_Detail

Warrants (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
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	$3,500	'	$3,500	'	$6,300
Gain (loss) from the change in fair value of warrant liability	($1,256)	$441	($2,734)	$138	'
Minimum [Member]	'	'	'	'	'
Summary Activity In Gold Bullion [Line Items]	'	'	'	'	'
Expiration dates of the warrants range	'	'	20-Oct-19	'	'
Maximum [Member]	'	'	'	'	'
Summary Activity In Gold Bullion [Line Items]	'	'	'	'	'
Expiration dates of the warrants range	'	'	30-Sep-20	'	'

Warrants_Schedule_of_Fair_Valu

Warrants (Schedule of Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model) (Detail) (Warrant [Member])	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Warrant Fair Value Black Scholes Method [Line Items]	'	'
Risk-free interest rate	1.87%	2.16%
Expected volatility	25.85%	33.80%
Dividend yield	1.05%	0.93%
Minimum [Member]	'	'
Warrant Fair Value Black Scholes Method [Line Items]	'	'
Expected term (years)	'5 years	'6 years
Maximum [Member]	'	'
Warrant Fair Value Black Scholes Method [Line Items]	'	'
Expected term (years)	'6 years	'7 years

Common_Stock_Narrative_Detail

Common Stock - (Narrative) (Detail) (USD $)	9 Months Ended		12 Months Ended					3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Oct. 21, 2014
				Common Class A [Member]	Common Class A [Member]	Common Class B [Member]	Common Class B [Member]	Board Authorized Share Repurchase Programs [Member]	Board Authorized Share Repurchase Programs [Member]	Subsequent Event [Member]
										Board Authorized Share Repurchase Programs [Member]
Schedule Of Common Stock [Line Items]	'	'	'	'	'	'	'	'	'	'
Stock repurchase program, authorized amount	'	'	'	'	'	'	'	'	'	$50,000,000
Shares repurchased (shares)	'	'	'	'	'	'	'	2,774,863	5,085,458	'
Repurchase of shares	$100,084,000	$20,590,000	'	'	'	'	'	$55,000,000	$100,100,000	'
Shares repurchased (weighted average cost per share)	'	'	'	'	'	'	'	$19.82	$19.66	'
Shares outstanding	39,862,824	'	44,918,336	38,995,050	41,890,562	867,774	3,027,774	'	'	'
Restricted issued but not yet vested, shares	1,149,505	'	1,064,460	'	'	'	'	'	'	'

Income_Per_Share_Narrative_Det

Income Per Share - (Narrative) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Earnings Per Share [Abstract]	'	'	'
Shares outstanding	39,862,824	51,213,044	'
Outstanding stock options to purchase common stock	3,613,191	3,538,012	3,515,486
Outstanding stock options to purchase common stock, per share	$19.89	$19.92	$19.92
Outstanding warrants	830,750	830,750	830,750
Warrants granted, exercise price per share	$20	$20	$20
Restricted shares outstanding	1,149,505	1,087,154	'

Income_Per_Share_Schedule_of_C

Income Per Share - (Schedule of Computation of Basic and Diluted Income Per Share) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Distributed earnings	$2,159	$2,622	$6,666	$7,934
Undistributed earnings (distributions in excess of earnings)	1,178	-1,675	231	-2,007
Net income	3,337	947	6,897	5,927
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	-12	-5	-28	-12
Income available to common stockholders (numerator)	$3,325	$942	$6,869	$5,915
Weighted average common shares outstanding (denominator)	41,837,485	51,454,200	43,403,791	51,940,245
Weighted average shares outstanding for diluted earnings per common share	41,841,685	51,501,980	43,423,273	51,973,161
Income per sharebbasic (in dollars per share)	$0.08	$0.02	$0.16	$0.11
Income per sharebdiluted (in dollars per share)	$0.08	$0.02	$0.16	$0.11
Equity Option [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Dilutive Convertible Securities	4,200	45,301	19,482	32,916
Warrant [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Dilutive Convertible Securities	0	2,479	0	0

Derivatives_FV_of_Derivatives_

Derivatives - (FV of Derivatives on the Balance Sheet) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives	$17	$129
Liability Derivatives	1,259	0
Not Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives	721	73
Liability Derivatives	774	74
Other assets [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives	17	129
Other assets [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives	721	73
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Liability Derivatives	1,259	0
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Liability Derivatives	$774	$74

Derivatives_Narrative_Details

Derivatives - (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013
		Not Designated as Hedging Instrument [Member]	Not Designated as Hedging Instrument [Member]	Fair Value Hedging [Member]	Fair Value Hedging [Member]	Fair Value Hedging [Member]	Fair Value Hedging [Member]	Fair Value Hedging [Member]	Fair Value Hedging [Member]
		Interest Rate Swap [Member]	Interest Rate Swap [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]
		Swap	Swap					Interest Rate Swap [Member]	Interest Rate Swap [Member]
								Swap	Swap
Derivative [Line Items]	'	'	'	'	'	'	'	'	'
Number of interest rate swaps held	'	9	3	'	'	'	'	9	1
Notional amount	'	$27,300,000	$7,300,000	'	'	'	'	$63,700,000	$10,000,000
Gain (loss) related to hedge ineffectiveness	'	'	'	46,000	0	186,000	0	'	'
Termination value of derivatives in net liability position	2,483,000	'	'	'	'	'	'	'	'
Collateral Already Posted, Aggregate Fair Value	$2,667,300	'	'	'	'	'	'	'	'

Derivatives_Derivatives_on_the

Derivatives - (Derivatives on the Income Statement) (Details) (Interest rate products [Member], Fair Value Hedging [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Designated as Hedging Instrument [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	($36)	$0	($1,371)	$0
Amount of Gain or (Loss) Recognized in Income on Hedged Item	-10	0	1,185	0
Designated as Hedging Instrument [Member] | Interest income [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	-36	0	-1,371	0
Amount of Gain or (Loss) Recognized in Income on Hedged Item	-10	0	1,185	0
Not Designated as Hedging Instrument [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	-1	-7	-51	-7
Not Designated as Hedging Instrument [Member] | Other Non-Interest income [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	($1)	($7)	($51)	($7)

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Commitment And Contingencies [Line Items]	'	'
Loan commitments	$475,400,000	$383,900,000
Standby Letters of Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Standby letters of credit	$7,163,000	$5,930,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitment And Contingencies [Line Items]	'	'
Unfunded commitment covered under the FDIC loss sharing agreement	$8,140	$14,020
Unfunded commitment not covered under the FDIC loss sharing agreement	474,422	375,849
Total Unfunded Loan Commitments	482,562	389,869
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	18,733	17,322
Total Unfunded Loan Commitments	18,733	17,322
Unfunded Commitments Under Lines of Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Unfunded commitment covered under the FDIC loss sharing agreement	7,895	13,162
Unfunded commitment not covered under the FDIC loss sharing agreement	210,961	175,177
Total Unfunded Loan Commitments	218,856	188,339
Commercial and Standby Letters of Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Unfunded commitment covered under the FDIC loss sharing agreement	234	443
Unfunded commitment not covered under the FDIC loss sharing agreement	6,929	5,487
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	2,015	1,303
Total Unfunded Loan Commitments	2,015	1,303
Commitments to Fund Loans [Member] | Commercial and Commercial Real Estate [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Unfunded commitment covered under the FDIC loss sharing agreement	11	415
Unfunded commitment not covered under the FDIC loss sharing agreement	200,113	169,214
Total Unfunded Loan Commitments	200,124	169,629
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	31,447	2,911
Total Unfunded Loan Commitments	31,447	2,911
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	4,224	4,435
Total Unfunded Loan Commitments	4,224	4,435
Standby Letters of Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Standby letters of credit	$7,163	$5,930

Fair_Value_Measurements_Tables1

Fair Value Measurements - (Tables of Financial Instruments Measured At Fair Value on Recurring Basis) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets at fair value	$1,554,379	$1,785,730
Total liabilities at fair value	40,700	38,820
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	738	202
Total liabilities at fair value	2,033	74
Warrant Liability [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total liabilities at fair value	3,547	6,281
Clawback Liability [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total liabilities at fair value	35,120	32,465
Investment Securities Available-For-Sale [Member] | Asset Backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets at fair value	356	4,537
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	427,127	494,990
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	1,125,739	1,285,582
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] | Investment Securities Available-For-Sale [Member] | Asset Backed 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] | 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	1,553,960	1,785,311
Total liabilities at fair value	2,033	74
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	738	202
Total liabilities at fair value	2,033	74
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] | Investment Securities Available-For-Sale [Member] | Asset Backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets at fair value	356	4,537
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	427,127	494,990
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	1,125,739	1,285,582
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	38,667	38,746
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	'
Level 3 [Member] | Warrant Liability [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total liabilities at fair value	3,547	6,281
Level 3 [Member] | Clawback Liability [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total liabilities at fair value	35,120	32,465
Level 3 [Member] | Investment Securities Available-For-Sale [Member] | Asset Backed Securities [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] | 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_Table_

Fair Value Measurements - (Table of Changes in Level 3 Financial Instruments) (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Warrant [Member]	'	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
Beginning Balance	$6,281	$5,461
Change in value	-2,734	138
Amortization	0	0
Net change in Level 3	-2,734	138
Ending Balance	3,547	5,599
Clawback Liability [Member]	'	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
Beginning Balance	32,465	31,271
Change in value	1,646	-244
Amortization	1,009	937
Net change in Level 3	2,655	693
Ending Balance	$35,120	$31,964

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Number of comparable companies for expected volatility	8	'
Measuring period for payments to the FDIC	'45 days	'
Number of Loans measured	24	'
Nonrecurring Loans Reserves	$200,000	'
Additions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Number of Loans measured	7	'
Nonrecurring Loans Reserves	300,000	'
Nonrecurring Loans Carrying value	2,500,000	'
Eliminations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Number of Loans measured	10	'
Nonrecurring Loans Reserves	900,000	'
FDIC [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Real Estate Owned Impairments Covered by the FDIC	1,100,000	6,600,000
Percentage of OREO impairments covered by the FDIC	60.20%	73.20%
Other Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Losses from change in fair value	-1,789,000	-9,142,000
Collateral Dependent Impaired Loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Losses from change in fair value	($145,000)	($1,305,000)

Fair_Value_Measurements_Inputs

Fair Value Measurements - (Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy) (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Other Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	$45,885	$70,753
Losses From Fair Value Changes	1,789	9,142
Impaired loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	47,225	29,075
Losses From Fair Value Changes	145	1,305
Level 1 [Member] | Other Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	0	0
Level 1 [Member] | Impaired loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	0	0
Level 2 [Member] | Other Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	0	0
Level 2 [Member] | Impaired loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	0	0
Level 3 [Member] | Other Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	45,885	70,753
Level 3 [Member] | Impaired loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Nonrecurring	$47,225	$29,075

Fair_Value_Measurements_Table_1

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 $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Other Securities [Member]

Impaired loans [Member]

Clawback Liability [Member]

Warrant Liability [Member]

Discounted Cash Flows [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Appraised value [Member]

Contractually Defined [Member]

Black-Scholes [Member]

Appraised value [Member]

Contractually Defined [Member]

Black-Scholes [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at fair value

$1,554,379,000

$1,785,730,000

$419,000

'

'

'

'

'

'

'

'

'

'

Total liabilities at fair value

40,700,000

38,820,000

'

47,225,000

35,120,000

3,547,000

'

'

'

'

'

'

'

Appraised values Discount rate

'

'

'

'

'

'

'

0.00%

'

'

25.00%

'

'

Intrinsic loss estimates

'

'

'

'

'

'

'

'

$323,300,000

'

'

$405,000,000

'

Discount rate

'

'

'

'

'

'

4.00%

'

'

'

'

'

'

Volatility

'

'

'

'

'

'

'

'

'

18.00%

'

'

36.00%

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - (Schedule of Fair Value of Financial Instruments) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS:	'	'	'	'
Cash and cash equivalents	$118,659	$189,460	$349,244	$769,180
Investment securities available-for-sale (at fair value)	1,553,641	1,785,528	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	557,464	641,907	'	'
Loans held-for-sale	5,252	5,787	'	'
LIABILITIES:	'	'	'	'
Time deposits	1,396,070	1,495,687	'	'
Securities sold under agreements to repurchase	109,946	99,547	'	'
Due to FDIC	35,120	41,882	'	'
Warrant liability	3,500	6,300	'	'
Asset Backed Securities [Member]	'	'	'	'
ASSETS:	'	'	'	'
Investment securities available-for-sale (at fair value)	356	4,537	'	'
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)	427,127	494,990	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	444,104	513,090	'	'
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]	'	'	'	'
ASSETS:	'	'	'	'
Investment securities available-for-sale (at fair value)	1,125,739	1,285,582	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	113,360	128,817	'	'
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	110,169	124,916	'	'
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	118,659	189,460	'	'
Carrying Amount [Member] | Level 2 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Capital stock of FHLB	6,010	6,643	'	'
Capital stock of FRB	15,630	25,020	'	'
Loans held-for-sale	5,252	5,787	'	'
Accrued interest receivable	12,851	11,355	'	'
Derivative asset	738	202	'	'
LIABILITIES:	'	'	'	'
Deposit transaction accounts	2,401,388	2,342,622	'	'
Time deposits	1,396,070	1,495,687	'	'
Securities sold under agreements to repurchase	109,946	99,547	'	'
Accrued interest payable	3,607	3,058	'	'
Derivative liability	2,033	74	'	'
Carrying Amount [Member] | Level 3 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Loans receivable, net	2,154,781	1,841,573	'	'
LIABILITIES:	'	'	'	'
Due to FDIC	35,120	41,882	'	'
Warrant liability	3,547	6,281	'	'
Carrying Amount [Member] | Asset Backed Securities [Member] | Level 2 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Investment securities available-for-sale (at fair value)	356	4,537	'	'
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)	427,127	494,990	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	444,104	513,090	'	'
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)	1,125,739	1,285,582	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	113,360	128,817	'	'
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	118,659	189,460	'	'
Estimated Fair Value [Member] | Level 2 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Capital stock of FHLB	6,010	6,643	'	'
Capital stock of FRB	15,630	25,020	'	'
Loans held-for-sale	5,252	5,787	'	'
Accrued interest receivable	12,851	11,355	'	'
Derivative asset	738	202	'	'
LIABILITIES:	'	'	'	'
Deposit transaction accounts	2,401,388	2,342,622	'	'
Time deposits	1,397,401	1,498,798	'	'
Securities sold under agreements to repurchase	109,946	99,547	'	'
Accrued interest payable	3,607	3,058	'	'
Derivative liability	2,033	74	'	'
Estimated Fair Value [Member] | Level 3 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Loans receivable, net	2,194,983	1,923,888	'	'
LIABILITIES:	'	'	'	'
Due to FDIC	35,120	41,882	'	'
Warrant liability	3,547	6,281	'	'
Estimated Fair Value [Member] | Asset Backed Securities [Member] | Level 2 [Member]	'	'	'	'
ASSETS:	'	'	'	'
Investment securities available-for-sale (at fair value)	356	4,537	'	'
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)	427,127	494,990	'	'
Mortgage-backed securitiesbresidential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	447,424	511,489	'	'
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)	1,125,739	1,285,582	'	'
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_Instru3

Fair Value of Financial Instruments - (Additional Information) (Detail)	9 Months Ended
	Sep. 30, 2014
Fair Value Of Financial Instruments [Abstract]	'
Residential mortgage loans held for sale period	'45 days