Capital Bank Financial (CBF) 10-Q 29 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 23, 2015
Document Information [Line Items]
Entity Registrant Name	Capital Bank Financial Corp.
Entity Central Index Key	1479750
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		30,078,235
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,553,429

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$96,484	$106,193
Interest-bearing deposits in other banks	143,497	81,942
Total cash and cash equivalents	239,981	188,135
Trading securities	2,853	2,410
Investment securities available-for-sale at fair value (amortized cost $568,621 and $554,488, respectively)	575,593	555,893
Investment securities held-to-maturity at amortized cost (fair value $457,939 and $443,379, respectively)	448,962	436,962
Loans held for sale	12,403	5,516
Loans, net of deferred loan costs and fees	5,065,606	4,994,703
Less: Allowance for loan and lease losses	48,225	50,211
Loans, net	5,017,381	4,944,492
Other real estate owned	71,453	77,626
FDIC indemnification asset	15,195	16,762
Receivable from FDIC	3,172	3,661
Premises and equipment, net	163,501	173,176
Goodwill	134,522	134,522
Intangible assets, net	17,943	18,897
Deferred income tax asset, net	121,083	129,624
Other assets	152,694	143,734
Total Assets	6,976,736	6,831,410
Deposits:
Non-interest bearing demand	1,114,423	1,054,128
Negotiable order of withdrawal	1,405,390	1,383,990
Money market	924,228	898,254
Savings	491,394	500,028
Time deposits	1,428,121	1,418,700
Total deposits	5,363,556	5,255,100
Federal Home Loan Bank advances	356,043	296,091
Short-term borrowings	27,605	23,407
Long-term borrowings	139,975	139,681
Accrued expenses and other liabilities	35,208	53,557
Total liabilities	5,922,387	5,767,836
Commitments and contingencies	0	0
Shareholders’ equity
Preferred stock $0.01 par value: 50,000 shares authorized, 0 shares issued	0	0
Additional paid in capital	1,081,912	1,081,628
Retained earnings	169,792	158,403
Accumulated other comprehensive income (loss)	274	-3,824
Treasury stock, at cost, 9,047 and 8,086 shares, respectively	-198,186	-173,190
Total shareholders’ equity	1,054,349	1,063,574
Total Liabilities and Shareholders’ Equity	6,976,736	6,831,410
Common Class A
Shareholders’ equity
Common stock	373	370
Total shareholders’ equity	373	370
Common Class B
Shareholders’ equity
Common stock	184	187
Total shareholders’ equity	$184	$187

Consolidated_Balance_Sheets_Un1

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Amortized cost of investment securities available-for-sale	$568,621	$554,488
Fair value of investment securities held-to-maturity	$457,939	$443,379
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Treasury stock, shares	9,047,000	8,086,000
Common Class A
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	37,310,000	36,936,000
Common stock, shares outstanding	30,037,000	30,150,000
Common Class B
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	18,369,000	18,743,000
Common stock, shares outstanding	16,595,000	17,443,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest and dividend income
Loans, including fees	$60,259	$63,219
Investment securities:
Taxable interest income	4,913	4,547
Tax-exempt interest income	140	156
Dividends	13	15
Interest-bearing deposits in other banks	33	25
Other earning assets	688	581
Total interest and dividend income	66,046	68,543
Interest expense
Deposits	4,410	4,316
Long-term borrowings	1,725	1,704
Federal Home Loan Bank advances	175	61
Other borrowings	7	9
Total interest expense	6,317	6,090
Net Interest Income	59,729	62,453
Net reversal of provision for loan and lease losses	-841	-24
Net interest income after reversal of provision for loan and lease losses	60,570	62,477
Non-Interest Income
Service charges on deposit accounts	4,705	5,436
Debit card income	2,964	2,844
Fees on mortgage loans originated and sold	1,147	759
Investment advisory and trust fees	1,006	1,261
FDIC indemnification asset expense	-2,439	-2,165
Investment securities gains, net	90	174
Other income	2,447	3,060
Total non-interest income	9,920	11,369
Non-Interest Expense
Salaries and employee benefits	23,881	23,498
Stock-based compensation expense	284	728
Net occupancy and equipment expense	8,129	8,599
Computer services	3,397	3,253
Software expense	2,142	1,868
Telecommunication expense	1,380	1,608
OREO valuation expense	1,390	3,573
Net gains on sales of OREO	-7	-721
Foreclosed asset related expense	674	1,459
Loan workout expense	623	1,177
Professional fees	1,734	2,004
Contingent value right expense	116	767
Regulatory assessments	1,695	1,629
Restructuring charges	2,341	0
Other expense	4,868	5,782
Total non-interest expense	52,647	55,224
Income before income taxes	17,843	18,622
Income tax expense	6,454	7,208
Net income attributable to Capital Bank Financial Corp.	$11,389	$11,414
Earnings per share:
Earnings per share, basic (in dollars per share)	$0.25	$0.23
Earnings per share, diluted (in dollars per share)	$0.24	$0.22
Weighted average shares outstanding:
Weighted average number of shares outstanding, basic	46,294	50,518
Weighted average number of shares outstanding, diluted	47,632	51,932

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$11,389	$11,414
Other comprehensive income before tax:
Unrealized holding gains on investment securities available-for-sale	5,617	2,388
Reclassification adjustment for gains realized in net income on securities available-for-sale	-51	-296
Reclassification adjustment for losses amortized in net income on securities held-to-maturity	363	338
Unrealized holding gains on cash flow hedges	803	0
Reclassification adjustments for net gains included in net income on cash flow hedges	-108	0
Other comprehensive income, before tax:	6,624	2,430
Tax effect	-2,526	-944
Other comprehensive income, net of tax:	4,098	1,486
Comprehensive income	$15,487	$12,900

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $)	Total	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Common Class A	Common Class B
In Thousands, except Share data, unless otherwise specified
Beginning balance at Dec. 31, 2013	$1,112,788	$1,082,235	$107,485	($7,528)	($69,962)	$362	$196
Beginning balance, shares at Dec. 31, 2013						33,051,000	19,047,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	11,414		11,414
Other comprehensive income, net of tax expense	1,486			1,486
Stock-based compensation	728	728
Purchase of treasury stock, shares						-769,000	-200,000
Purchase of treasury stock	-22,660				-22,660
Conversion of shares, shares						193,000	-193,000
Conversion of shares						2	-2
Ending balance at Mar. 31, 2014	1,103,756	1,082,963	118,899	-6,042	-92,622	364	194
Ending balance, shares at Mar. 31, 2014						32,475,000	18,654,000
Beginning balance at Dec. 31, 2014	1,063,574	1,081,628	158,403	-3,824	-173,190	370	187
Beginning balance, shares at Dec. 31, 2014						30,150,000	17,443,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	11,389		11,389
Other comprehensive income, net of tax expense	4,098			4,098
Stock-based compensation	284	284
Purchase of treasury stock, shares						-487,000	-474,000
Purchase of treasury stock	-24,996				-24,996
Conversion of shares, shares						374,000	-374,000
Conversion of shares						3	-3
Ending balance at Mar. 31, 2015	$1,054,349	$1,081,912	$169,792	$274	($198,186)	$373	$184
Ending balance, shares at Mar. 31, 2015						30,037,000	16,595,000

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (Accumulated Other Comprehensive Income (Loss), USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income tax expense	$2,526	$944

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Net Income	$11,389	$11,414
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Accretion of purchased credit impaired loans	-24,840	-33,162
Depreciation and amortization	4,655	4,814
Impairment of premises and equipment	1,525	0
Net reversal of provision for loan and lease losses	-841	-24
Deferred income tax	6,015	5,209
Net amortization of investment securities premium/discount	1,663	2,190
Net realized gains on sales of investment securities	-90	-174
Stock-based compensation expense	284	728
Net gains on sales of OREO	-7	-721
OREO valuation expense	1,390	3,573
Other	2	10
Net deferred loan origination fees	-839	-1,047
Mortgage loans originated for sale	-49,165	-22,820
Proceeds from sales of mortgage loans originated for sale	43,425	26,758
Fees on mortgage loans originated and sold	-1,147	-759
FDIC indemnification asset expense	2,439	2,165
Gains on sales/disposals of premises and equipment	-3	-17
Proceeds from FDIC loss share agreements	276	4,898
Change in other assets	-1,685	671
Change in accrued expenses and other liabilities	-18,300	2,170
Net cash (used in) provided by operating activities	-23,854	5,876
Cash flows from investing activities
Purchases of investment securities available-for-sale	-54,469	-335
Purchases of investment securities held-to-maturity	-29,911	0
Sales of investment securities available-for-sale	20,328	800
Repayments of principal and maturities of investment securities available-for-sale	18,023	27,674
Repayments of principal and maturities of investment securities held-to-maturity	18,243	15,682
Net (purchases) sales of FHLB and FRB stock	-1,997	6,180
Net (increase) decrease in loans	-49,467	25,647
Purchases of premises and equipment	-547	-2,093
Proceeds from sales of premises and equipment	0	3
Proceeds from sales of OREO	7,887	15,979
Net cash (used in) provided by investing activities	-71,910	89,537
Cash flows from financing activities
Net increase in demand, money market and savings accounts	99,035	72,205
Net increase (decrease) in time deposits	9,421	-65,075
Net increase in federal funds purchased and securities sold under agreement to repurchase	4,198	5,602
Net increase (decrease) in short-term FHLB advances	60,000	-75,000
Decrease in long-term FHLB advances	-48	-46
Purchases of treasury stock	-24,996	-22,660
Net cash provided by (used in) financing activities	147,610	-84,974
Net increase in cash and cash equivalents	51,846	10,439
Cash and cash equivalents at beginning of period	188,135	164,441
Cash and cash equivalents at end of period	239,981	174,880
Supplemental disclosures of cash:
Interest paid	3,527	5,212
Cash collections of contractual interest on purchased credit impaired loans	15,642	22,620
Income taxes paid	930	320
Supplemental disclosures of non-cash transactions:
OREO acquired through loan transfers	$3,098	$9,706

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	Nature of Operations and Principles of Consolidation
	Capital Bank Financial Corp. (“CBF” or the “Company”; formerly known as North American Financial Holdings, Inc.) is a bank holding company incorporated in late 2009 in Delaware and headquartered in Florida whose business is conducted primarily through Capital Bank, National Association (“Capital Bank, NA” or the “Bank”). The Company was incorporated with the goal of creating a regional banking franchise in the southeastern region of the United States through organic growth and acquisitions of other banks, including failed, underperforming and undercapitalized banks. CBF has raised $955.6 million to make acquisitions through a series of private placements and an initial public offering of its common stock. Since inception, CBF has acquired seven depository institutions, including the assets and certain deposits from failed banks. CBF has a total of 162 full service banking offices located in Florida, North and South Carolina, Tennessee and Virginia. Through its branches CBF offers a wide range of commercial and consumer loans and deposits, as well as ancillary financial services.
	The accompanying unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Regulation S-X. Accordingly, they do not include all of the information and disclosures required by U.S. GAAP for complete financial statement presentation. In the opinion of management, all adjustments consisting of normal recurring accruals and disclosures considered necessary for a fair interim presentation have been included. All significant inter-company accounts and transactions have been eliminated in consolidation. For further information, refer to the Company’s Consolidated Financial Statements and notes thereto included in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2014.
	Certain prior period amounts have been reclassified to conform to the current period presentation.
	Use of Estimates and Assumptions
	To prepare financial statements in conformity with U. S. GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as presented in the financial statements. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. Material estimates that are particularly susceptible to significant change include the determination of the allowance for loan and lease losses, including estimates of expected cash flows for impaired loans, determination of fair value, determination of impairment of financial instruments, goodwill and intangible assets and the determination of deferred income tax assets and liabilities. Changes in assumptions or in market conditions could significantly affect the fair value estimates.
	Recent Accounting Pronouncements
	In April 2015, the Financial Accounting Standard Board (the “FASB”) issued Accounting Standards Update ("ASU") 2015-3, "Interest - Imputation of interest" (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs". The amendments in ASU 2015-3 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update. The amendments in ASU 2015-3 are effective for financial statements issued for fiscal years beginning after December 31, 2015, and interim periods within those fiscal years. The adoption of ASU 2015-3 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In November 2014, the FASB issued ASU 2014-16, “Derivative and Hedging” (Topic 815)”. The amendments in ASU 2014-16 do not change the current criteria in GAAP for determining when separation of certain embedded derivative features in a hybrid financial instrument is required, but clarifies how current GAAP should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. Specifically, the amendments explain that an entity should consider all relevant terms and features in evaluating the nature of the host contract. Furthermore, the amendments specify that no single term or feature would necessarily determine the economic characteristics and risks of the host contract. Rather, the nature of the host contract depends upon the economic characteristics and risks of the entire hybrid financial instrument. In addition, the amendments clarify that, in evaluating the nature of a host contract, an entity should assess the substance of the relevant terms and features. The amendments in ASU 2014-16 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The adoption of ASU 2014-16 is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.
	In August 2014, the FASB issued ASU 2014-15, "Presentation of Financial Statements-Going Concern (Subtopic 205-40)—Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern". The amendments in ASU 2014-15 provide guidance in U.S. GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The amendments in ASU 2014-15 apply to all entities and will be effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. The adoption of ASU 2014-15 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In August 2014, the FASB issued ASU 2014-14, "Receivables—Troubled Debt Restructuring by Creditors (Subtopic 310-40)—Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure". The amendment in ASU 2014-14 requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if certain conditions are met. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in ASU 2014-14 affect creditors that hold government-guaranteed mortgage loans, including those guaranteed by the Federal Housing Administration ("FHA") of the U.S. Department of Housing and Urban Development ("HUD"), and the U.S. Department of Veterans Affairs ("VA"). ASU 2014-14 will be effective for the annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The adoption of ASU 2014-14 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In June 2014, the FASB issued ASU No. 2014-12, “Compensation- Stock Compensation (Topic 718)—Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could be Achieved after the Requisite Service Period”. ASU 2014-12 provides specific guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. ASU 2014-12 is effective for fiscal years and interim periods beginning after December 15, 2015. The adoption of ASU 2014-12 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In June 2014, the FASB issued ASU No. 2014-11, “Transfers and Servicing (topic 860)—Repurchase-to-Maturity Transactions, Repurchase Financing, and Disclosures”. ASU 2014-11 changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.
	The accounting changes in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after December 15, 2015. The adoption of ASU 2014-11 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.  Disclosures for repurchase agreements, securities lending transactions and repurchase-to-maturities transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after December 15, 2015. These disclosures are not expected to have a material impact on the Company's consolidated financial position, results of operations or cash flows.
	In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contracts with Customers (Topic 606)”. ASU 2014-9 clarifies the principles for recognizing revenue from contracts with customers. ASU 2014-9, which does not apply to financial instruments, is effective for interim and annual reporting periods beginning after December 15, 2016. The Company is currently evaluating ASU 2014-9 to determine the impact on its consolidated financial position, results of operations and cash flows.
	In January 2014, the FASB issued ASU 2014-4, “Receivables—Troubled Debt Restructuring by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force).” ASU 2014-4 clarifies that when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed-in-lieu of foreclosure or through a similar legal agreement. ASU 2014-4 is effective for fiscal years and interim periods beginning after December 15, 2014. The adoption of ASU 2014-4 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.

Earnings_Per_Common_Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share
	Basic earnings per share is computed as net income attributable to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the dilutive effect of additional potential common shares issuable under stock options and unvested restricted shares computed using the treasury stock method. Earnings per share have been computed based on the following:
	(Shares in thousands)	Three Months Ended
		31-Mar-15	31-Mar-14
	Weighted average number of shares outstanding:
	Basic	46,294	50,518
	Dilutive effect of options outstanding	676	970
	Dilutive effect of unvested restricted shares	662	444
	Diluted	47,632	51,932
	The dilutive effect of stock options and unvested restricted shares are the only common stock equivalents for purposes of calculating diluted earnings per common share.
	Weighted average anti-dilutive stock options and unvested restricted shares excluded from the computation of diluted earnings per share are as follows:
	(Shares in thousands)	Three Months Ended
		31-Mar-15	31-Mar-14
	Anti-dilutive stock options	10	15
	Anti-dilutive unvested restricted shares	—	—

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	Trading securities totaled $2.9 million and $2.4 million at March 31, 2015 and December 31, 2014, respectively.
	The amortized cost and estimated fair value of investment securities available-for-sale and held-to-maturity at March 31, 2015 and December 31, 2014, are presented below:
	(Dollars in thousands)	31-Mar-15
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Available-for-Sale
	Corporate bonds	$	22,588	$	13	$	117	$	22,484
	Mortgage-backed securities—residential issued by government sponsored entities	542,624		$	7,415	467		549,572
	Industrial revenue bonds	3,409		128		—		3,537
	Total	$	568,621	$	7,556	$	584	$	575,593
	Held-to-Maturity
	U.S. Government agencies	$	13,709	$	295	$	—	$	14,004
	Corporate bonds	30,071		294		23		30,342
	State and political subdivisions—tax exempt	11,922		524		8		12,438
	State and political subdivisions—taxable	535		29		—		564
	Mortgage-backed securities—residential issued by government sponsored entities	392,725		7,907		41		400,591
	Total	$	448,962	$	9,049	$	72	$	457,939
	(Dollars in thousands)	December 31, 2014
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Available-for-Sale
	Mortgage-backed securities—residential issued by government sponsored entities	$	550,908	$	3,127	$	1,832	$	552,203
	Industrial revenue bonds	3,580		110		—		3,690
	Total	$	554,488	$	3,237	$	1,832	$	555,893
	Held-to-Maturity
	U.S. Government agencies	$	13,989	$	230	$	—	$	14,219
	Corporate bonds	25,000		163		—		25,163
	State and political subdivisions—tax exempt	13,008		431		3		13,436
	State and political subdivisions—taxable	537		26		—		563
	Mortgage-backed securities—residential issued by government sponsored entities	384,428		5,626		56		389,998
	Total	$	436,962	$	6,476	$	59	$	443,379
	Proceeds from sales of securities were $20.3 million and $0.8 million for the three months ended March 31, 2015 and 2014, respectively. Gross gains of $0.1 million and $0.3 million were realized on sales of these investments during the three months ended March 31, 2015 and 2014, respectively.
	The estimated fair value of investment securities at March 31, 2015, by contractual maturity, is shown in the table that follows. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations without call or prepayment penalties. Debt securities not due at a single maturity date are shown separately.
	(Dollars in thousands)	31-Mar-15
		Amortized		Estimated		Yield
		Cost		Fair Value
	Available-for-sale
	Due in one year or less	$	—	$	—	—	%
	Due after one year through five years	—		—		—	%
	Due after five years through ten years	—		—		—	%
	Due after ten years	25,997		26,021		2.42	%
	Mortgage-backed securities—residential issued by government sponsored entities	542,624		549,572		1.92	%
	Total	$	568,621	$	575,593	1.94	%
		Amortized		Estimated		Yield
		Cost		Fair Value
	Held-to-maturity
	Due in one year or less	$	203	$	203	0.77	%
	Due after one year through five years	16,267		16,368		4.59	%
	Due after five years through ten years	25,523		26,210		4.53	%
	Due after ten years	14,244		14,567		2.88	%
	Mortgage-backed securities—residential issued by government sponsored entities	392,725		400,591		2.4	%
	Total	$	448,962	$	457,939	2.62	%
	Securities with unrealized losses not recognized in income, and the period of time they have been in an unrealized loss position, are as follows:
	(Dollars in thousands)	Less than 12 Months				12 Months or Longer				Total
	31-Mar-15	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Available-for-Sale
	Corporate bonds	$	14,109	$	117	$	—	$	—	$	14,109	$	117
	Mortgage-backed securities—residential issued by government sponsored entities	63,213		342		11,248		125		74,461		467
	Total	$	77,322	$	459	$	11,248	$	125	$	88,570	$	584
	Held-to-Maturity
	Corporate bonds	$	5,048	$	23	$	—	$	—	$	5,048	$	23
	State and political subdivisions—tax exempt	1,000		8		—		—		1,000		8
Mortgage-backed securities—residential issued by government sponsored entities	3,445		41		—		—		3,445		41
Total	$	9,493	$	72	$	—	$	—	$	9,493	$	72
(Dollars in thousands)	Less than 12 Months				12 Months or Longer				Total
December 31, 2014	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Available-for-Sale
Mortgage-backed securities—residential issued by government sponsored entities	$	215,139	$	1,596	$	28,439	$	236	$	243,578	$	1,832
Total	$	215,139	$	1,596	$	28,439	$	236	$	243,578	$	1,832
Held-to-Maturity
State and political subdivisions—tax exempt	$	896	$	3	$	—	$	—	$	896	$	3
Mortgage-backed securities—residential issued by government sponsored entities	13,995		56		—		—		13,995		56
Total	$	14,891	$	59	$	—	$	—	$	14,891	$	59
As of March 31, 2015, the Company’s security portfolio consisted of 135 securities, 15 of which were in an unrealized loss position. The majority of unrealized losses are related to the Company’s mortgage-backed securities and variable-rate corporate securities.
All of the mortgage-backed securities at March 31, 2015 and December 31, 2014 were issued by U.S. government-sponsored entities and agencies, which the government has affirmed its commitment to support. Unrealized losses associated with these securities are attributable to changes in interest rates and illiquidity, and not credit quality, and because the Company does not have the intent to sell these mortgage-backed securities and it is more likely than not that it will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at March 31, 2015 or December 31, 2014.
Investment securities having carrying values of approximately $392.0 million and $339.0 million at March 31, 2015 and December 31, 2014, respectively, were pledged to secure public funds on deposit, securities sold under agreements to repurchase, and for other purposes as required by law.

Loans

Loans	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans	Loans
	Major classifications of loans, including loans held for sale, are as follows:
	(Dollars in thousands)		31-Mar-15				31-Dec-14
	Non-owner occupied commercial real estate		$	823,763			$	798,556
	Other commercial construction and land		180,166				200,755
	Multifamily commercial real estate		88,980				89,132
	1-4 family residential construction and land		66,547				68,658
	Total commercial real estate		1,159,456				1,157,101
	Owner occupied commercial real estate		1,038,493				1,046,736
	Commercial and industrial		1,125,708				1,073,791
	Lease financing		1,834				2,005
	Total commercial		2,166,035				2,122,532
	1-4 family residential		928,832				925,698
	Home equity loans		379,946				378,475
	Other consumer loans		296,753				272,453
	Total consumer		1,605,531				1,576,626
	Other		146,987				143,960
	Total loans		$	5,078,009			$	5,000,219
	Total loans include $12.4 million and $5.5 million of 1-4 family residential loans held for sale and $11.0 million and $10.1 million of net deferred loan origination costs and fees as of March 31, 2015 and December 31, 2014, respectively.
	As of March 31, 2015, other loans include $44.3 million, $78.0 million and $1.5 million of farm land, state and political subdivision obligations and deposit customer overdrafts, respectively. As of December 31, 2014, other loans include $41.3 million, $76.9 million and $1.7 million of farm land, state and political subdivision obligations and deposit customer overdrafts, respectively.
	Covered loans represent loans acquired from the FDIC subject to loss sharing agreements. Covered loans are further broken out into (i) loans acquired with evidence of credit impairment (“Purchased Credit Impaired", "Acquired Impaired", or "PCI Loans”) and (ii) non-PCI loans. Loans originated or purchased by the Company (“New Loans”) and loans acquired through the purchase of Capital Bank Corp. ("CBKN"), Green Bankshares ("GRNB"), Southern Community Financial ("SCMF" or "Southern Community") and TIB Financial ("TIBB"), are not subject to the loss sharing agreements and are classified as “non covered.” Additionally, certain consumer loans acquired through the acquisition of First National Bank of the South, Metro Bank and Turnberry Bank (collectively, the “Failed Banks”) from the FDIC, are specifically excluded from the loss sharing agreements.
	As of March 31, 2015, covered loans and OREO subject to the commercial shared-loss agreements expiring on July 16, 2015, were $103.5 million and $14.3 million, respectively. The commercial shared-loss agreements provide for FDIC loss sharing for five years from July 16, 2010 and our reimbursement for recoveries to the FDIC for eight years from July 16, 2010 for all other covered assets. Covered loans and OREO subject to the single family shared-loss agreements expiring on July 16, 2020, were $84.9 million and $0.7 million, respectively. The single family shared-loss agreements provide for FDIC loss sharing and our reimbursement for recoveries to the FDIC for ten years from July 16, 2010.
	The Company designates loans as PCI by evaluating both qualitative and quantitative factors. At the time of acquisition, the Company accounted for the PCI loans by segregating each portfolio into loan pools with similar risk characteristics. Over the lives of the acquired PCI loans, the Company continues to estimate cash flows expected to be collected on each loan pool. The Company evaluates, at each balance sheet date, whether its estimates of the present value of the cash flows from the loan pools, determined using the effective interest rates, has decreased, such that the present value of such cash flows is less than the recorded investment of the pool, and if so, recognizes a provision for loan loss in its Consolidated Statements of Income, unless related to non-credit events.
	Additionally, if the Company has favorable changes in estimates of cash flows expected to be collected for a loan pool such that the then-present value exceeds the recorded investment of that pool, the Company will first reverse any previously established allowance for loan and lease losses for the pool. If such estimate exceeds the amount of any previously established allowance, the Company will accrete future interest income over the remaining life of the pool at a rate which, when used to discount the expected cash flows, results in the then-present value of such cash flows equaling the recorded investment of the pool at the time of the revised estimate.
	The table below presents a roll forward of accretable yield and income expected to be earned related to PCI loans and the amount of non-accretable difference at the end of the period. Nonaccretable difference represents estimated contractually required payments in excess of estimated cash flows expected to be collected. The accretable yield represents the excess of estimated cash flows expected to be collected over the carrying amount of the PCI loans. Other represents reductions of accretable yield due to non-credit events such as interest rate reductions on variable rate PCI loans and prepayment activity on PCI loans.
	(Dollars in thousands)		Three Months Ended
			31-Mar-15				31-Mar-14
	Accretable Yield
	Balance at beginning of period		$	292,633			$	383,775
	Accretion of income		(24,840		)		(33,162		)
	Reclassification from nonaccretable difference		26,517				6,667
	Other		(48,201		)		(10,285		)
	Balance at end of period		$	246,109			$	346,995
	Nonaccretable difference, balance at the end of the period		$	207,762			$	253,865
	The accretable yield is accreted into interest income over the estimated life of the PCI loans using the level yield method. The accretable yield will change due to changes in:
	•	The estimate of the remaining life of PCI loans which may change the amount of future interest income, and possibly principal, expected to be collected;
	•	The estimate of the amount of contractually required principal and interest payments over the estimated life that will not be collected (the nonaccretable difference); and
	•	Indices for PCI loans with variable rates of interest.
	For PCI loans, the impact of loan modifications is included in the evaluation of expected cash flows for subsequent decreases or increases of cash flows. For variable rate PCI loans, expected future cash flows will be recalculated as the rates adjust over the lives of the loans. At acquisition, the expected future cash flows were based on the variable rates that were in effect at that time.
	Because of the loss protection provided by the FDIC, the risks of covered loans and foreclosed real estate are significantly different from those assets not covered under the loss share agreements. Refer to Note 7 – Other Real Estate Owned for the covered balances of other real estate owned.
	Non-covered Loans
	The following is a summary of the major categories of non-covered loans outstanding as of March 31, 2015 and December 31, 2014:
	(Dollars in thousands)		Non-PCI Loans
	March 31, 2015		New				Acquired				PCI Loans			Total
														Non-covered
														Loans
	Non-owner occupied commercial real estate		$	401,128			$	56,303			$	335,812		$	793,243
	Other commercial construction and land		67,723				144				101,489			169,356
	Multifamily commercial real estate		49,598				11,004				23,768			84,370
	1-4 family residential construction and land		60,822				—				4,857			65,679
	Total commercial real estate		579,271				67,451				465,926			1,112,648
	Owner occupied commercial real estate		744,802				37,107				210,403			992,312
	Commercial and industrial loans		1,023,319				9,276				86,221			1,118,816
	Lease financing		1,834				—				—			1,834
	Total commercial		1,769,955				46,383				296,624			2,112,962
	1-4 family residential		577,772				41,413				259,705			878,890
	Home equity loans		114,890				149,352				78,062			342,304
	Other consumer loans		287,488				4,403				4,756			296,647
	Total consumer		980,150				195,168				342,523			1,517,841
	Other		105,615				3,563				36,983			146,161
	Total loans		$	3,434,991			$	312,565			$	1,142,056		$	4,889,612
	(Dollars in thousands)		Non-PCI Loans
	December 31, 2014		New				Acquired				PCI Loans			Total
														Non-covered
Loans
Non-owner occupied commercial real estate		$	372,793			$	58,552			$	333,433		$	764,778
Other commercial construction and land		66,817				161				123,398			190,376
Multifamily commercial real estate		47,765				12,327				24,377			84,469
1-4 family residential construction and land		58,046				—				9,742			67,788
Total commercial real estate		545,421				71,040				490,950			1,107,411
Owner occupied commercial real estate		745,728				38,122				215,059			998,909
Commercial and industrial loans		958,628				10,564				97,228			1,066,420
Lease financing		2,005				—				—			2,005
Total commercial		1,706,361				48,686				312,287			2,067,334
1-4 family residential		560,106				43,921				269,768			873,795
Home equity loans		103,644				152,797				82,121			338,562
Other consumer loans		261,935				4,647				5,772			272,354
Total consumer		925,685				201,365				357,661			1,484,711
Other		99,610				3,603				39,903			143,116
Total loans		$	3,277,077			$	324,694			$	1,200,801		$	4,802,572
Covered Loans
The following is a summary of the major categories of covered loans outstanding as of March 31, 2015, and December 31, 2014:
(Dollars in thousands)		Non-PCI Loans
March 31, 2015		New				Acquired				PCI Loans			Total
													Covered
													Loans
Non-owner occupied commercial real estate		$	—			$	—			$	30,520		$	30,520
Other commercial construction and land		—				—				10,810			10,810
Multifamily commercial real estate		—				—				4,610			4,610
1-4 family residential construction and land		—				—				868			868
Total commercial real estate		—				—				46,808			46,808
Owner occupied commercial real estate		—				—				46,181			46,181
Commercial and industrial loans		—				211				6,681			6,892
Lease financing		—				—				—			—
Total commercial		—				211				52,862			53,073
1-4 family residential		—				1,400				48,542			49,942
Home equity loans		—				28,758				8,884			37,642
Other consumer loans		—				—				106			106
Total consumer		—				30,158				57,532			87,690
Other		—				—				826			826
Total loans		$	—			$	30,369			$	158,028		$	188,397
(Dollars in thousands)		Non-PCI Loans
December 31, 2014		New				Acquired				PCI Loans			Total Covered
													Loans
Non-owner occupied commercial real estate		$	—			$	—			$	33,778		$	33,778
Other commercial construction and land		—				—				10,379			10,379
Multifamily commercial real estate		—				—				4,663			4,663
1-4 family residential construction and land		—				—				870			870
Total commercial real estate		—				—				49,690			49,690
Owner occupied commercial real estate		—				—				47,827			47,827
Commercial and industrial loans		—				214				7,157			7,371
Lease financing		—				—				—			—
Total commercial		—				214				54,984			55,198
1-4 family residential		—				1,512				50,391			51,903
Home equity loans		—				30,473				9,440			39,913
Other consumer loans		—				—				99			99
Total consumer		—				31,985				59,930			91,915
Other		—				—				844			844
Total loans		$	—			$	32,199			$	165,448		$	197,647
The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of March 31, 2015:
(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
									and Still Accruing/Accreting
Non-purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
Non-owner occupied commercial real estate	$	—			$	—			$	—		$	—		$	648	$	—	$	648
Other commercial construction and land	143				—				—			—			383		—		526
Multifamily commercial real estate	—				—				—			—			—		—		—
1-4 family residential construction and land	106				—				—			—			—		—		106
Total commercial real estate	249				—				—			—			1,031		—		1,280
Owner occupied commercial real estate	229				—				—			—			4,380		—		4,609
Commercial and industrial loans	54				—				—			—			1,561		65		1,680
Lease financing	—				—				—			—			—		—		—
Total commercial	283				—				—			—			5,941		65		6,289
1-4 family residential	654				—				—			—			1,628		66		2,348
Home equity loans	568				73				—			—			1,466		408		2,515
Other consumer loans	2,733				—				—			—			877		—		3,610
Total consumer	3,955				73				—			—			3,971		474		8,473
Other	473				—				—			—			—		—		473
Total loans	$	4,960			$	73			$	—		$	—		$	10,943	$	539	$	16,515
(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
									and Still Accruing/Accreting
Purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
Non-owner occupied commercial real estate	$	501			$	—			$	13,492		$	1,812		$	—	$	—	$	15,805
Other commercial construction and land	142				41				26,263			4,811			—		—		31,257
Multifamily commercial real estate	526				—				2,037			—			—		—		2,563
1-4 family residential construction and land	—				—				724			—			—		—		724
Total commercial real estate	1,169				41				42,516			6,623			—		—		50,349
Owner occupied commercial real estate	976				11				14,454			1,123			—		—		16,564
Commercial and industrial loans	276				9				22,161			—			—		—		22,446
Lease financing	—				—				—			—			—		—		—
Total commercial	1,252				20				36,615			1,123			—		—		39,010
1-4 family residential	2,364				65				19,160			3,621			—		—		25,210
Home equity loans	765				71				3,934			1,248			—		—		6,018
Other consumer loans	123				—				155			27			—		—		305
Total consumer	3,252				136				23,249			4,896			—		—		31,533
Other	111				—				843			—			—		—		954
Total loans	$	5,784			$	197			$	103,223		$	12,642		$	—	$	—	$	121,846
The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of December 31, 2014:
(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
									and Still Accruing/Accreting
Non-purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
Non-owner occupied commercial real estate	$	—			$	—			$	—		$	—		$	534	$	—	$	534
Other commercial construction and land	31				—				—			—			233		—		264
Multifamily commercial real estate	—				—				—			—			—		—		—
1-4 family residential construction and land	—				—				—			—			—		—		—
Total commercial real estate	31				—				—			—			767		—		798
Owner occupied commercial real estate	744				—				—			—			2,524		—		3,268
Commercial and industrial loans	70				—				—			—			1,654		66		1,790
Lease financing	—				—				—			—			—		—		—
Total commercial	814				—				—			—			4,178		66		5,058
1-4 family residential	357				—				—			—			1,284		69		1,710
Home equity loans	627				225				—			—			1,758		443		3,053
Other consumer loans	2,508				—				—			—			909		—		3,417
Total consumer	3,492				225				—			—			3,951		512		8,180
Other	30				—				—			—			10		—		40
Total loans	$	4,367			$	225			$	—		$	—		$	8,906	$	578	$	14,076
(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
									and Still Accruing/Accreting
Purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
Non-owner occupied commercial real estate	$	164			$	—			$	14,943		$	1,636		$	—	$	—	$	16,743
Other commercial construction and land	199				—				24,602			4,043			—		—		28,844
Multifamily commercial real estate	—				—				1,924			—			—		—		1,924
1-4 family residential construction and land	—				—				873			—			—		—		873
Total commercial real estate	363				—				42,342			5,679			—		—		48,384
Owner occupied commercial real estate	1,472				—				15,189			1,131			—		—		17,792
Commercial and industrial loans	195				—				23,115			63			—		—		23,373
Lease financing	—				—				—			—			—		—		—
Total commercial	1,667				—				38,304			1,194			—		—		41,165
1-4 family residential	1,820				115				21,224			4,682			—		—		27,841
Home equity loans	1,042				21				3,614			1,300			—		—		5,977
Other consumer loans	112				—				174			27			—		—		313
Total consumer	2,974				136				25,012			6,009			—		—		34,131
Other	118				—				2,597			—			—		—		2,715
Total loans	$	5,122			$	136			$	108,255		$	12,882		$	—	$	—	$	126,395
Pooled PCI loans are not classified as nonaccrual as they are considered to be accruing because their interest income relates to the accretable yield recognized under accounting for purchased credit-impaired loans and not to contractual interest payments.
Credit Quality Indicators
The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis is performed at origination and upon identification of a material change for all loans, on an annual basis for commercial loans exceeding $0.5 million, and at least quarterly for commercial loans not rated Pass. The Company uses the following definitions for risk ratings:
•	Pass —These loans range from superior quality with minimal credit risk to loans requiring heightened management attention but that are still an acceptable risk and continue to perform as contracted.
•	Special Mention —Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.
•	Substandard —Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.
•	Doubtful —Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.
The following table summarizes loans, excluding PCI loans by internal rating at March 31, 2015:
									Substandard
(Dollars in thousands)	Pass				Special Mention				Accruing/			Non-accrual			Doubtful		Total
									Accreting
Non-owner occupied commercial real estate	$	455,114			$	21			$	1,648		$	648		$	—	$	457,431
Other commercial construction and land	67,408				46				30			383			—		67,867
Multifamily commercial real estate	60,602				—				—			—			—		60,602
1-4 family residential construction and land	57,505				2,119				1,198			—			—		60,822
Total commercial real estate	640,629				2,186				2,876			1,031			—		646,722
Owner occupied commercial real estate	767,745				7,225				2,558			4,381			—		781,909
Commercial and industrial loans	1,026,075				2,832				2,273			1,626			—		1,032,806
Lease financing	1,834				—				—			—			—		1,834
Total commercial	1,795,654				10,057				4,831			6,007			—		1,816,549
1-4 family residential	616,470				263				2,158			1,694			—		620,585
Home equity loans	288,988				58				2,081			1,873			—		293,000
Other consumer loans	291,014				—				—			877			—		291,891
Total consumer	1,196,472				321				4,239			4,444			—		1,205,476
Other	108,705				473				—			—			—		109,178
Total loans	$	3,741,460			$	13,037			$	11,946		$	11,482		$	—	$	3,777,925
The following table summarizes loans, excluding PCI loans by internal rating at December 31, 2014:
									Substandard
(Dollars in thousands)	Pass				Special Mention				Accruing/			Non-accrual			Doubtful		Total
									Accreting
Non-owner occupied commercial real estate	$	429,126			$	835			$	850		$	534		$	—	$	431,345
Other commercial construction and land	66,667				47				31			233			—		66,978
Multifamily commercial real estate	60,092				—				—			—			—		60,092
1-4 family residential construction and land	56,551				—				1,495			—			—		58,046
Total commercial real estate	612,436				882				2,376			767			—		616,461
Owner occupied commercial real estate	766,822				6,687				7,817			2,524			—		783,850
Commercial and industrial loans	963,273				2,235				2,178			1,720			—		969,406
Lease financing	2,005				—				—			—			—		2,005
Total commercial	1,732,100				8,922				9,995			4,244			—		1,755,261
1-4 family residential	601,738				283				2,165			1,353			—		605,539
Home equity loans	282,597				59				2,057			2,201			—		286,914
Other consumer loans	265,673				—				—			909			—		266,582
Total consumer	1,150,008				342				4,222			4,463			—		1,159,035
Other	102,730				473				—			10			—		103,213
Total loans	$	3,597,274			$	10,619			$	16,593		$	9,484		$	—	$	3,633,970

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan and Lease Losses
	Activity in the allowance for loan and lease losses for the three months ended March 31, 2015 and 2014 is as follows:
	(Dollars in thousands)		Three Months Ended
			31-Mar-15				31-Mar-14
	Balance, beginning of period		$	50,211			$	56,851
	Reversal of provision for loan losses for PCI loans		(1,926		)		(2,488		)
	Provision for loan losses for non-PCI loans		1,085				2,464
	Non-PCI loans charged-off		(1,899		)		(1,956		)
	Recoveries of non-PCI loans previously charged-off		754				735
	Balance, end of period		$	48,225			$	55,606
	The following tables present the roll forward of the allowance for loan and lease losses for the three months ended March 31, 2015 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2014				Provision/				Net(Charge-offs)/				31-Mar-15
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	2,022			$	(135	)		$	3			$	1,890
	Other commercial construction and land		12,181				233				161				12,575
	Multifamily commercial real estate		252				(29		)		—				223
	1-4 family residential construction and land		1,102				(83		)		1				1,020
	Total commercial real estate		15,557				(14		)		165				15,708
	Owner occupied commercial real estate		2,504				183				(112		)		2,575
	Commercial and industrial loans		9,502				(382		)		97				9,217
	Lease financing		—				—				—				—
	Total commercial		12,006				(199		)		(15		)		11,792
	1-4 family residential		15,451				(1,710		)		(211		)		13,530
	Home equity loans		2,815				42				(68		)		2,789
	Other consumer loans		4,122				753				(733		)		4,142
	Total consumer		22,388				(915		)		(1,012		)		20,461
	Other		260				287				(283		)		264
	Total loans		$	50,211			$	(841	)		$	(1,145	)		$	48,225
	The following table presents the roll forward of the allowance for loan and lease losses for the three months ended March 31, 2014 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2013				Provision/				Net (Charge-offs)/				31-Mar-14
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	4,635			$	(819	)		$	13			$	3,829
	Other commercial construction and land		8,217				875				(200		)		8,892
	Multifamily commercial real estate		320				83				—				403
	1-4 family residential construction and land		1,558				2				(1		)		1,559
	Total commercial real estate		14,730				141				(188		)		14,683
	Owner occupied commercial real estate		4,450				(807		)		(113		)		3,530
	Commercial and industrial loans		8,310				(189		)		77				8,198
	Lease financing		3				(2		)		—				1
	Total commercial		12,763				(998		)		(36		)		11,729
	1-4 family residential		21,724				(1,323		)		(18		)		20,383
	Home equity loans		3,869				1,054				(48		)		4,875
	Other consumer loans		2,682				1,020				(639		)		3,063
	Total consumer		28,275				751				(705		)		28,321
	Other		1,083				82				(292		)		873
	Total loans		$	56,851			$	(24	)		$	(1,221	)		$	55,606
	The following tables present the roll forward of the allowance for loan and lease losses for PCI and non-PCI loans for the three months ended March 31, 2015 and 2014, by the class of loans against which the allowance is allocated:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15
		Non-PCI				PCI				Total
	Allowance for loan and lease losses at the beginning of the period	$	21,355			$	28,856			$	50,211
	Charge-offs:
	Non-owner occupied commercial real estate	—				—				—
	Other commercial construction and land	(8		)		—				(8		)
	Multifamily commercial real estate	—				—				—
	1-4 family residential construction and land	—				—				—
	Total commercial real estate	(8		)		—				(8		)
	Owner occupied commercial real estate	(112		)		—				(112		)
	Commercial and industrial loans	(54		)		—				(54		)
	Lease financing	—				—				—
	Total commercial	(166		)		—				(166		)
	1-4 family residential	(215		)		—				(215		)
	Home equity loans	(160		)		—				(160		)
	Other consumer loans	(867		)		—				(867		)
Total consumer	(1,242		)		—				(1,242		)
Other	(483		)		—				(483		)
Total charge-offs	(1,899		)		—				(1,899		)
Recoveries:
Non-owner occupied commercial real estate	3				—				3
Other commercial construction and land	169				—				169
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	1				—				1
Total commercial real estate	173				—				173
Owner occupied commercial real estate	—				—				—
Commercial and industrial loans	151				—				151
Lease financing	—				—				—
Total commercial	151				—				151
1-4 family residential	4				—				4
Home equity loans	92				—				92
Other consumer loans	134				—				134
Total consumer	230				—				230
Other	200				—				200
Total recoveries	754				—				754
Net charge-offs	(1,145		)		—				(1,145		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	32				(167		)		(135		)
Other commercial construction and land	(204		)		437				233
Multifamily commercial real estate	(4		)		(25		)		(29		)
1-4 family residential construction and land	(29		)		(54		)		(83		)
Total commercial real estate	(205		)		191				(14		)
Owner occupied commercial real estate	300				(117		)		183
Commercial and industrial loans	(213		)		(169		)		(382		)
Lease financing	1				(1		)		—
Total commercial	88				(287		)		(199		)
1-4 family residential	107				(1,817		)		(1,710		)
Home equity loans	55				(13		)		42
Other consumer loans	747				6				753
Total consumer	909				(1,824		)		(915		)
Other	293				(6		)		287
Total provision (reversal) for loan and lease losses	1,085				(1,926		)		(841		)
Allowance for loan and lease losses at the end of the period	$	21,295			$	26,930			$	48,225
(Dollars in thousands)	Three Months Ended
	31-Mar-14
	Non-PCI				PCI				Total
Allowance for loan and lease losses at the beginning of the period	$	18,951			$	37,900			$	56,851
Charge-offs:
Non-owner occupied commercial real estate	—				—				—
Other commercial construction and land	(208		)		—				(208		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	(3		)		—				(3		)
Total commercial real estate	(211		)		—				(211		)
Owner occupied commercial real estate	(136		)		—				(136		)
Commercial and industrial loans	(55		)		—				(55		)
Lease financing	—				—				—
Total commercial	(191		)		—				(191		)
1-4 family residential	(21		)		—				(21		)
Home equity loans	(129		)		—				(129		)
Other consumer loans	(807		)		—				(807		)
Total consumer	(957		)		—				(957		)
Other	(597		)		—				(597		)
Total charge-offs	(1,956		)		—				(1,956		)
Recoveries:
Non-owner occupied commercial real estate	13				—				13
Other commercial construction and land	8				—				8
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	2				—				2
Total commercial real estate	23				—				23
Owner occupied commercial real estate	23				—				23
Commercial and industrial loans	132				—				132
Lease financing	—				—				—
Total commercial	155				—				155
1-4 family residential	3				—				3
Home equity loans	81				—				81
Other consumer loans	168				—				168
Total consumer	252				—				252
Other	305				—				305
Total recoveries	735				—				735
Net charge-offs	(1,221		)		—				(1,221		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	22				(841		)		(819		)
Other commercial construction and land	500				375				875
Multifamily commercial real estate	(11		)		94				83
1-4 family residential construction and land	(34		)		36				2
Total commercial real estate	477				(336		)		141
Owner occupied commercial real estate	222				(1,029		)		(807		)
Commercial and industrial loans	35				(224		)		(189		)
Lease financing	(1		)		(1		)		(2		)
Total commercial	256				(1,254		)		(998		)
1-4 family residential	254				(1,577		)		(1,323		)
Home equity loans	141				913				1,054
Other consumer loans	1,188				(168		)		1,020
Total consumer	1,583				(832		)		751
Other	148				(66		)		82
Total provision (reversal) for loan and lease losses	2,464				(2,488		)		(24		)
Allowance for loan and lease losses at the end of the period	$	20,194			$	35,412			$	55,606
The following table presents the balance in the allowance for loan and lease losses and the recorded investment in loans by class of loan and by impairment evaluation method as of March 31, 2015:
(Dollars in thousands)	Allowance for Loan and Lease Losses												Loans
	Individually				Collectively				Purchased				Individually			Collectively		Purchased
	Evaluated				Evaluated				Credit-				Evaluated			Evaluated		Credit-
	for				for				Impaired				for			for		Impaired
	Impairment				Impairment								Impairment			Impairment (1)
Non-owner occupied commercial real estate	$	—			$	1,598			$	292			$	464		$	456,967	$	366,332
Other commercial construction and land	—				1,369				11,206				—			67,867		112,299
Multifamily commercial real estate	—				122				101				—			60,602		28,378
1-4 family residential construction and land	—				710				310				—			60,822		5,725
Total commercial real estate	—				3,799				11,909				464			646,258		512,734
Owner occupied commercial real estate	302				2,015				258				4,667			777,242		256,584
Commercial and industrial loans	—				7,627				1,590				2,188			1,030,618		92,902
Lease financing	—				—				—				—			1,834		—
Total commercial	302				9,642				1,848				6,855			1,809,694		349,486
1-4 family residential	8				2,728				10,794				901			607,281		308,247
Home equity loans	18				608				2,163				625			292,375		86,946
Other consumer loans	9				3,835				298				252			291,639		4,862
Total consumer	35				7,171				13,255				1,778			1,191,295		400,055
Other					346				(82		)					109,178		37,809
Total loans	$	337			$	20,958			$	26,930			$	9,097		$	3,756,425	$	1,300,084
-1	Loans collectively evaluated for impairment include $341.6 million of acquired loans which are presented net of unamortized purchase discounts of $10.9 million.
The following table presents the balance in the allowance for loan and lease losses and the recorded investment in loans by class of loan and by impairment evaluation method as of December 31, 2014:
(Dollars in thousands)	Allowance for Loan and Lease Losses												Loans
	Individually				Collectively				Purchased				Individually			Collectively		Purchased
	Evaluated				Evaluated				Credit-				Evaluated			Evaluated		Credit-
	for				for				Impaired				for			for		Impaired
	Impairment				Impairment								Impairment			Impairment (1)
Non-owner occupied commercial real estate	$	—			$	1,563			$	459			$	—		$	431,345	$	367,211
Other commercial construction and land	—				1,411				10,770				—			66,978		133,777
Multifamily commercial real estate	—				126				126				—			60,092		29,040
1-4 family residential construction and land	—				739				363				—			58,046		10,612
Total commercial real estate	—				3,839				11,718				—			616,461		540,640
Owner occupied commercial real estate	—				2,129				375				3,423			780,427		262,886
Commercial and industrial loans	—				7,742				1,760				2,704			966,702		104,385
Lease financing	—				—				—				—			2,005		—
Total commercial	—				9,871				2,135				6,127			1,749,134		367,271
1-4 family residential	—				2,840				12,611				745			599,278		320,159
Home equity loans	—				639				2,176				325			286,589		91,561
Other consumer loans	15				3,815				292				221			266,361		5,871
Total consumer	15				7,294				15,079				1,291			1,152,228		417,591
Other	—				336				(76		)		—			103,213		40,747
Total loans	$	15			$	21,340			$	28,856			$	7,418		$	3,621,036	$	1,366,249
-1	Loans collectively evaluated for impairment include $355.4 million of acquired loans which are presented net of unamortized purchase discounts of $11.7 million.
Troubled Debt Restructuring
If a borrower is experiencing financial difficulty, the Bank may consider, in certain circumstances, modifying the terms of their loan to maximize collection of amounts due. A troubled debt restructuring (“TDR”) typically involves either a reduction of the stated interest rate of the loan, an extension of the loan’s maturity date(s) with a stated rate lower than the current market rate for a new loan with similar risk, or in limited circumstances, a reduction of the principal balance of the loan or the loan’s accrued interest. Upon modification of a loan, the Bank measures the related impairment as the excess of the recorded investment in the loan over the discounted expected future cash flows. The present value of expected future cash flows is discounted at the loan’s effective interest rate. If the impairment analysis results in a loss, an allowance for loan and lease losses is established for the loan. During the three months ended March 31, 2015 and 2014, loans modified in TDRs were nominal. Because of the insignificance of the amount and the nature of the modifications, the modifications did not have a material impact on the Company’s Consolidated Financial Statements or on the determination of the allowance for loan and lease losses at March 31, 2015 and 2014. The Company had loans modified in TDRs with recorded investments of $0.5 million and $0.3 million for the three months ended March 31, 2015 and 2014, respectively.

FDIC_Indemnification_Asset

FDIC Indemnification Asset	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
FDIC Indemnification Asset	FDIC Indemnification Asset
	The Company has recorded an indemnification asset related to loss sharing agreements entered into with the FDIC wherein the FDIC will reimburse the Company for certain amounts related to certain acquired loans and other real estate owned should the Company experience a loss. Under the loss sharing arrangements, the FDIC has agreed to absorb 80% of all future credit losses and workout expenses on these assets which occur prior to the expiration of the loss sharing agreements. These agreements resulted from the purchase of the Failed Banks.
	The loss sharing agreements consist of three (one for each Failed Bank) single-family shared-loss agreements and three (one for each Failed Bank) commercial and other loans shared-loss agreements. The single family shared-loss agreements provide for FDIC loss sharing and our reimbursement for recoveries to the FDIC for ten years from July 16, 2010 for single-family residential loans. The commercial shared-loss agreements provide for FDIC loss sharing for five years from July 16, 2010 and our reimbursement for recoveries to the FDIC for eight years from July 16, 2010 for all other covered assets.
	The following is a summary of the activity in the FDIC indemnification asset:
	(Dollars in thousands)
	Balance, December 31, 2014	$	16,762
	Indemnification asset income	77
	Amortization of indemnification asset	(2,516		)
	Cash paid on net recoveries	872
	Balance, March 31, 2015	$	15,195
	Balance, December 31, 2013	$	33,610
	Indemnification asset income	345
	Amortization of indemnification asset	(2,510		)
	Cash received on reimbursable losses	(2,701		)
	Balance, March 31, 2014	$	28,744

Other_Real_Estate_Owned

Other Real Estate Owned	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Other Real Estate Owned	Other Real Estate Owned
	The activity within Other Real Estate Owned (“OREO”) for the three months ended March 31, 2015 and 2014 is presented in the table below. Ending balances for OREO covered by loss sharing agreements with the FDIC for these periods were $15.0 million and $18.6 million, respectively. Non-covered OREO ending balances for these periods were $56.5 million and $101.7 million, respectively.
	For the three months ended March 31, 2015, proceeds on sales of OREO were $7.9 million and net gains on sales were $7 thousand. For the three months ended March 31, 2014, proceeds on sales of OREO were $16.0 million and net gains were $0.7 million.
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Balance, beginning of period	$	77,626		$	129,396
	Real estate acquired from borrowers	3,098			9,706
	Valuation allowance	(1,390		)	(3,573		)
	Properties sold	(7,881		)	(15,259		)
	Balance, end of period	$	71,453		$	120,270

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances and Short-Term Borrowings	3 Months Ended
	Mar. 31, 2015
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances and Short-Term Borrowings	Federal Home Loan Bank Advances and Short-Term Borrowings
	Short-term borrowings include securities sold under agreements to repurchase and advances from the Federal Home Loan Bank (“FHLB”).
	The Bank has securities sold under agreements to repurchase with customers. These agreements are collateralized by investment securities of the United States Government or its agencies which are chosen by the Bank. The amounts outstanding at March 31, 2015 and December 31, 2014 were $27.0 million and $23.4 million, respectively.
	The Bank invests in FHLB stock for the purpose of establishing credit lines with the FHLB. The credit availability to the Bank is based on a percentage of the Bank’s total assets as reported on the most recent quarterly financial information submitted to the regulators subject to the pledging of sufficient collateral. The Bank’s collateral with the FHLB consists of a blanket floating lien pledge of the Bank’s residential 1-4 family mortgage, multifamily, home equity line of credit and commercial real estate secured loans. The amounts of eligible collateral at March 31, 2015 and December 31, 2014 provided for incremental borrowing availability of up to $204.1 million and $247.7 million, respectively.
	At March 31, 2015 and December 31, 2014, the Bank had $25.4 million and $25.7 million in letters of credit issued by the FHLB respectively, of which $25.2 million are used as collateral for public fund deposits in lieu of pledging securities to the State of Florida.
	The advances as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Mar-15		Maturity Date	Interest Rate as of March 31, 2015
	$	165,000	May 19, 2015	0.36%
	40,000		November 25, 2016	0.21%	(1 Month FRC + 2 bps)*
	540		November 6, 2017	0.50%
	50,000		November 20, 2017	0.22%	(1 Month FRC + 2 bps)*
	50,000		November 23, 2018	0.21%	(1 Month FRC + 2 bps)*
	50,000		December 31, 2019	0.21%	(1 Month FRC + 2 bps)*
	503		February 10, 2026	—%
	$	356,043
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Dec-14		Maturity Date	Interest Rate as of December 31, 2014
	$	105,000	May 19, 2015	0.36%
	40,000		November 25, 2016	0.25%	(1 Month FRC + 2 bps)*
	578		November 6, 2017	0.50%
	50,000		November 20, 2017	0.25%	(1 Month FRC + 2 bps)*
	50,000		November 23, 2018	0.26%	(1 Month FRC + 2 bps)*
	50,000		December 31, 2019	0.21%	(1 Month FRC + 2 bps)*
	513		February 10, 2026	—%
	$	296,091
	(*) FRC =HLB Fixed Rate Credit interest rate.

LongTerm_Borrowings

Long-Term Borrowings	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term Borrowings
	Structured repurchase agreements
	The repurchase agreements as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
	Carrying Amount
	31-Mar-15				31-Dec-14				Contractual Amount				Maturity Date	Contractual Rate
	$	10,469			$	10,540			$	10,000			November 6, 2016	4.75%
	10,520				10,582				10,000				March 30, 2017	4.50%
	10,362				10,394				10,000				December 18, 2017	3.79%
	10,342				10,372				10,000				December 18, 2017	3.72%
	10,602				10,638				10,000				March 22, 2019	3.56%
	$	52,295			$	52,526			$	50,000
	These repurchase agreements have a weighted-average rate of 4.06% at March 31, 2015 and December 31, 2014 and are collateralized by $59.8 million and $61.4 million, respectively, of mortgage-backed securities.
	Subordinated Debentures
	Through its acquisitions of CBKN, GRNB, SCMF and TIBB, the Company assumed thirteen separate pooled offerings of trust preferred securities. The Company is not considered the primary beneficiary of the trusts (variable interest entities), therefore the trusts are not consolidated in the Company’s Consolidated Financial Statements, but rather the subordinated debentures are presented as liabilities. The trusts consist of wholly-owned statutory trust subsidiaries for the purpose of issuing the trust preferred securities. The trusts used the proceeds from the issuance of trust preferred securities to acquire junior subordinated deferrable interest debentures of the Company. The trust preferred securities essentially mirror the debt securities, carrying a cumulative preferred dividend equal to the interest rate on the debt securities. The debt securities and the trust preferred securities each have 30-year lives. The trust preferred securities and the debt securities are callable by the Company or the trust, at their respective option after a period of time, and at varying premiums and sooner in specific events, subject to prior approval by the Federal Reserve Board (“FRB”), if then required. Deferral of interest payments on the trust preferred securities is allowed for up to 60 months without being considered an event of default.
	The subordinated debentures as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
							Carrying Amount
	Date of Offering		Face Amount				31-Mar-15				31-Dec-14			Interest Rate as of March 31, 2015			Maturity Date
	July 31, 2001		$	5,000			$	3,915			$	3,900		3.83	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	July 31, 2001		4,000				2,715				2,699			3.83	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	June 26, 2003		10,000				6,041				6,017			3.37	%	(3 Month LIBOR + 310 bps)	June 26, 2033
	September 25, 2003		10,000				6,553				6,516			3.1	%	(3 Month LIBOR + 285 bps)	October 8, 2033
	December 30, 2003		10,000				5,827				5,802			3.1	%	(3 Month LIBOR + 285 bps)	December 30, 2033
	June 28, 2005		3,000				1,607				1,594			1.95	%	(3 Month LIBOR + 168 bps)	June 28, 2035
	December 22, 2005		10,000				4,637				4,607			1.67	%	(3 Month LIBOR + 140 bps)	March 15, 2036
	December 28, 2005		13,000				6,721				6,668			1.81	%	(3 Month LIBOR + 154 bps)	March 15, 2036
	June 23, 2006		20,000				11,562				11,488			1.8	%	(3 Month LIBOR + 155 bps)	July 7, 2036
	May 16, 2007		56,000				29,121				28,904			1.92	%	(3 Month LIBOR + 165 bps)	June 15, 2037
	June 15, 2007		10,000				5,452				5,426			1.69	%	(3 Month LIBOR + 143 bps)	September 6, 2037
			$	151,000			$	84,151			$	83,621
	Other Subordinated Debentures
	Through the acquisition of CBKN, the Company assumed $3.4 million in aggregate principal amount of subordinated promissory notes with a fixed interest rate of 10.0% due March 18, 2020. The notes had a carrying value of $3.5 million as of March 31, 2015 and December 31, 2014, respectively.
	At March 31, 2015, the maturities of long-term borrowings were as follows:
	(Dollars in thousands)		Fixed Rate				Floating Rate				Total
	Due in 2015		$	—			$	—			$	—
	Due in 2016		10,469				—				10,469
	Due in 2017		31,224				—				31,224
	Due in 2018		—				—				—
	Due in 2019		10,602				—				10,602
	Thereafter		3,529				84,151				87,680
	Total		$	55,824			$	84,151			$	139,975

Shareholders_Equity_and_Minimu

Shareholders' Equity and Minimum Regulatory Capital Requirements	3 Months Ended
	Mar. 31, 2015
Regulatory Capital Requirements [Abstract]
Shareholders' Equity and Minimum Regulatory Capital Requirements	Shareholders’ Equity and Minimum Regulatory Capital Requirements
	The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by federal and state banking agencies. Failure to meet minimum capital requirements results in certain discretionary and required actions by regulators that could have an effect on the Company’s operations. The regulations require the Company and the Bank to meet specific capital adequacy guidelines that involve quantitative measures of assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
	To be considered well capitalized or adequately capitalized as defined under the regulatory framework for prompt corrective action, the Bank must maintain minimum Tier 1 leverage, Tier 1 common, Tier 1 risk-based and Total Risk-based ratios. At March 31, 2015 and December 31, 2014 the Bank maintained capital ratios exceeding the requirement to be considered well capitalized. These minimum ratios along with the actual ratios for the Company and the Bank are presented in the following tables:
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	March 31, 2015	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Leverage Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$267,376	≥ 4.0%	$	963,616	14.40%
	Capital Bank, N.A.	$332,757	≥ 5.0%	$266,206	≥ 4.0%	$	724,780	10.90%
	Tier 1 Common Equity Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$251,277	≥ 4.5%	$	893,491	16.00%
	Capital Bank, N.A.	$361,237	≥ 6.5%	$250,087	≥ 4.5%	$	724,780	13.00%
	Tier 1 Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$335,036	≥ 6.0%	$	963,616	17.30%
	Capital Bank, N.A.	$444,599	≥ 8.0%	$333,449	≥ 6.0%	$	724,780	13.00%
	Total Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$446,715	≥ 8.0%	$	1,015,826	18.20%
	Capital Bank, N.A.	$555,749	≥ 10.0%	$444,599	≥ 8.0%	$	776,855	14.00%
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	31-Dec-14	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$261,445	≥ 4.0%	$	933,335	14.30%
	Capital Bank, N.A.	$326,050	≥ 5.0%	$260,840	≥ 4.0%	$	881,395	13.50%
	Tier 1 Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$207,370	≥ 4.0%	$	933,335	18.00%
	Capital Bank, N.A.	$310,245	≥ 6.0%	$206,830	≥ 4.0%	$	881,395	17.00%
	Total Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$414,740	≥ 8.0%	$	987,535	19.10%
	Capital Bank, N.A.	$517,074	≥ 10.0%	$413,660	≥ 8.0%	$	935,455	18.10%
	In August 2010, Capital Bank, NA entered into an Operating Agreement with the Office of the Comptroller of the Currency (the “OCC Operating Agreement”). The OCC Operating Agreement requires Capital Bank, NA to maintain total capital equal to at least 12% of risk-weighted assets, Tier 1 Capital equal to at least 11% of risk-weighted assets and a minimum leverage ratio of 10% (Tier 1 Capital ratio).
	As of March 31, 2015 and December 31, 2014, the Company and the Bank met all capital requirements to which they were subject. Tier 1 Capital for the Company includes trust preferred securities to the extent allowable.
	The OCC Operating Agreement requires prior approval from the OCC before paying a dividend to the Company. Dividends that may be paid by a national bank are limited to that bank’s retained net profits for the preceding two years plus retained net profits up to the date of any dividend declaration in the current calendar year. Subsequent to receiving approval from the OCC, the Company received dividends from the bank totaling $199.4 million, $56.0 million and $105.0 million on January 30, 2015, July 15, 2014 and September 24, 2013, respectively. The Company may use these dividends for general corporate purposes including acquisitions, or as a return of capital to shareholders through future share repurchases or dividends.
	In July 2013, the U.S. banking regulators adopted a final rule which implements the Basel III regulatory capital reforms from the Basel Committee on Banking Supervision, and certain changes required by the Dodd-Frank Act. The final rule established an integrated regulatory capital framework and introduces the “Standardized Approach” for risk-weighted assets, which replaces the Basel I risk-based guidance for determining risk-weighted assets as of January 1, 2015, the date the Company became subject to the new rules. Based on the Company's current capital composition and levels, the Company believes it is in compliance with the requirements as set forth in the final rules.
	The rules include new risk-based capital and leverage ratios, which will be phased in from 2015 to 2019, and refine the definition of what constitutes “capital” for purposes of calculating those ratios. The new minimum capital level requirements applicable to the Company and the Bank under the final rules are as follows: (i) a new common equity Tier 1 capital ratio of 4.5%; (ii) a Tier 1 capital ratio of 6% (increased from 4%); (iii) a total capital ratio of 8% (unchanged from previous rules); and (iv) a Tier 1 leverage ratio of 4% for all institutions. The final rules also establish a “capital conservation buffer” above the new regulatory minimum capital requirements. The capital conservation buffer will be phased-in over four years beginning on January 1, 2016, as follows: the maximum buffer will be 0.625% of risk-weighted assets for 2016, 1.25% for 2017, 1.875% for 2018, and 2.5% for 2019 and thereafter. This will result in the following minimum ratios beginning in 2019: (i) a common equity Tier 1 capital ratio of 7.0%, (ii) a Tier 1 capital ratio of 8.5%, and (iii) a total capital ratio of 10.5%. Under the final rules, institutions are subject to limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses if its capital level falls below the buffer amount. These limitations establish a maximum percentage of eligible retained income that could be utilized for such actions. As of March 31, 2015, our capital buffer would be 5.98%; exceeding the 2.5% 2019 requirement.
	The final rules also contain revisions to the prompt corrective action framework, which is designed to place restrictions on insured depository institutions if their capital levels begin to show signs of weakness. Under the prompt corrective action requirements, which are designed to complement the capital conservation buffer, insured depository institutions are now required to meet the following increased capital level requirements in order to qualify as “well capitalized:” (i) a new common equity Tier 1 capital ratio of 6.5%; (ii) a Tier 1 capital ratio of 8% (increased from 6%); (iii) a total capital ratio of 10% (unchanged from previous rules); and (iv) a Tier 1 leverage ratio of 5% (unchanged from previous rules).
	Share Repurchases
	The Company’s Board of Directors authorized stock repurchase plans of up to $300.0 million. Stock repurchases may be made from time to time, on the open market or in privately negotiated transactions. The approved stock repurchase programs do not obligate the Company to repurchase any particular amount of shares, and the programs may be extended, modified, suspended, or discontinued at any time.
	During the three months ended March 31, 2015, the Company repurchased $25.0 million, or 961,257 common shares at an average price of $25.99 per share. As of March 31, 2015, the Company has repurchased a total of $198.2 million, or 9,046,956 common shares at an average price of $21.91 per share with $101.8 million of remaining availability for future share repurchases.
	The Company accounts for treasury stock using the cost method as a reduction of shareholders’ equity in the accompanying Consolidated Balance Sheets and Statements of Changes in Shareholders’ Equity.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	As of March 31, 2015, the Company had two compensation plans, the 2010 Equity Incentive Plan ("the "2010 Plan") and the 2013 Omnibus Compensation Plan (the “2013 Plan”) under which shares of its common stock are issuable in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, stock awards, stock bonus awards and other incentive awards. The 2010 Plan was replaced by the 2013 Plan and no further awards may be made pursuant to the 2010 Plan.
	The 2013 Plan was effective May 22, 2013 and expires on May 22, 2023, the tenth anniversary of the effective date. The maximum number of shares of common stock of the Company that may be optioned or awarded under this plan is 2,639,000 shares. Awards under this plan may be made to any person selected by the Compensation Committee.
	The following table summarizes the components and classification of stock-based compensation expense for the three months ended March 31, 2015 and 2014:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Stock options	$	184		$	195
	Restricted stock	100			533
	Total stock-based compensation expense	$	284		$	728
	The tax benefit related to stock-based compensation expense arising from restricted stock awards and non-qualified stock options was $0.1 million and $0.3 million for the three months ended March 31, 2015 and 2014, respectively.
	At March 31, 2015, unrecognized stock-based compensation expense was $71 thousand related to stock options and $38 thousand related to restricted stock. The stock-based compensation expense is expected to be recognized over the weighted-average remaining requisite service period of 2 months.
	Stock Options
	Under the 2010 Plan and 2013 Plan, the exercise price for common stock must equal at least 100% of the fair market value of the stock on the day an option is granted. The exercise price under an incentive stock option granted to a person owning stock representing more than 10% of the common stock must equal at least 110% of the fair market value at the date of grant, and such option is not exercisable after five years from the date the incentive stock option was granted. The Board of Directors may, at its discretion, provide that an option not be exercised in whole or in part for any period or periods of time as specified in the option agreements. No option may be exercised after the expiration of ten years from the date it is granted. No stock options were granted under these plans during the three months ended March 31, 2015 and 2014.
	ASC 718 requires the recognition of stock-based compensation for the number of awards that are ultimately expected to vest. During the three months ended March 31, 2015 and 2014, stock based compensation expense was recorded based upon assumptions that the Company would experience no forfeitures. This assumption of forfeitures will be reassessed in subsequent periods based on historical forfeiture rates and may change based on new facts and circumstances. Any changes in assumptions will be accounted for prospectively in the period of change.
	A summary of the stock option activity for the three months ended March 31, 2015 and 2014 is as follows:
		Three Months Ended
		March 31, 2015						March 31, 2014
	(Shares in thousands)	Shares		Weighted				Shares			Weighted
				Average							Average
				Exercise Price Per Share							Exercise Price
											Per Share
	Balance, January 1,	3,111		$	20.26			3,124			$	20.5
	Granted	—		—				—			—
	Exercised	—		—				—			—
	Canceled, expired or forfeited	(1	)	589.41				(2	)		301.94
	Balance, March 31,	3,110		$	20.19			3,122			$	20.4
	At March 31, 2015, the weighted average remaining contractual life for outstanding stock options was approximately 5.40 years and the aggregate intrinsic values were $23.1 million and $22.0 million for stock options outstanding and exercisable, respectively.
	The intrinsic value for stock options is calculated as the difference between the exercise price of the underlying awards and the market price of the Company’s common stock as of the reporting date.
	Options outstanding at March 31, 2015 were as follows:
	(Shares in thousands)	Outstanding Options								Exercisable Options
	Range of Exercise Prices	Shares		Weighted		Weighted				Shares			Weighted
				Average		Average							Average
				Remaining		Exercise Price							Exercise Price
				Contractual		Per							Per
				Life		Share							Share
	$18.00	236		8.14 years		$	18			122			$	18
	$20.00	2,864		5.18 years		20				2,864			20
	$28.44 - $2,026.00	10		3.09 years		122.48				10			122.48
	$18.00 - $2,026.00	3,110		5.40 years		$	20.19			2,996			$	20.27
	Restricted Stock
	Restricted stock provides the grantee with voting, dividend and anti-dilution rights equivalent to common shareholders, but is restricted from transfer until vested, at which time all restrictions are removed. The terms of the restricted stock awards granted to employees provide for vesting upon the achievement of stock price goals as follows: (1) one-third at $25.00 per share; (2) one-third at $28.00 per share; and (3) one-third at $32.00 per share. Achievement of stock price goals is generally defined as the average closing price of the shares for any consecutive 30-day trading period exceeding the applicable price target. The value of the restricted stock is being amortized on a straight-line basis over the implied service periods. No restricted stock awards were granted under the 2013 Plan during the three months ended March 31, 2015 and 2014.
	The following table summarizes unvested restricted stock activity for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31, 2015						March 31, 2014
	(Shares in thousands)	Shares		Weighted				Shares			Weighted
				Average							Average
				Grant-Date							Grant-Date
				Fair Value							Fair Value
				Per Share							Per Share
	Balance, January 1,	810		$	13.89			1,215			$	14.28
	Granted	—		—				—			—
	Vested or released	—		—				—			—
	Canceled, expired or forfeited	—		—				—			—
	Balance, March 31,	810		$	13.89			1,215			$	14.28

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	A reconciliation of income tax computed at applicable Federal statutory income tax rates to total income tax expense reported for the three months ended March 31, 2015 and 2014 is as follows:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Income before income taxes	$	17,843		$	18,622
	Income taxes computed at Federal statutory tax rate	6,245			6,518
	Effect of:
	State taxes (net of federal benefit)	452			709
	Tax-exempt interest income, net	(489		)	(175		)
	Contingent value right expense (CVR)	—			268
	Other, net	246			(112		)
	Total income tax expense	$	6,454		$	7,208
	The Company uses an estimated annual effective tax rate method of computing its interim tax provision. The effective tax rate is based on forecasted annual pre-tax income, permanent differences and statutory tax rates. For the three months ended March 31, 2015 and 2014, the effective income tax rates were 36% and 39%, respectively. The change in effective income tax rate was mainly due to the favorable impact from higher tax-exempt interest income and lower non-deductible CVR expense.
	The Company and its subsidiaries are subject to U.S. federal income tax, as well as income tax of the states of Florida, South and North Carolina and Tennessee. The net deferred tax assets as of March 31, 2015 and December 31, 2014 were $121.1 million and $129.6 million, respectively. A valuation allowance related to deferred tax assets is required when it is considered more likely than not that all or part of the benefit related to such assets will not be realized. In assessing the need for a valuation allowance, the Company considered both positive and negative evidence in concluding that no valuation allowance was necessary at March 31, 2015 and December 31, 2014.
	At March 31, 2015 and December 31, 2014 the company had $81.9 million and $91.1 million of gross federal and state net operating loss carryforwards, respectively, which begin to expire after 2029 if unused and are subject to annual cumulative limitation of $10.9 million.
	At March 31, 2015 and December 31, 2014, the Company had no unrecognized tax benefits and no amounts recorded for uncertain tax positions.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value	Fair Value
	FASB guidance on fair value measurements defines fair value, establishes a framework for measuring fair value, and requires fair value disclosures for certain assets and liabilities measured at fair value on a recurring and non-recurring basis.
	This guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants in the principal or most advantageous market for the asset or liability.
	This guidance establishes a fair value hierarchy for disclosure of fair value measurements to maximize the use of observable inputs, that is, inputs that reflect the assumptions market participants would use in pricing an asset or liability based on market data obtained from sources independent of the reporting entity. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
	Level 1:	Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity can access as of the measurement date.
	Level 2:	Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	Level 3:	Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.
	Cash & cash equivalents
	Cash and cash equivalents include cash on hand and highly-liquid items with an original maturity of three months or less. Accordingly, the carrying amount of such instruments is considered to be a reasonable estimate of fair value.
	Derivative financial instruments
	Interest rate swaps are valued by a third party, using models that primarily use market observable inputs, such as yield curves, and are validated by comparison with valuations provided by the respective counterparties. The credit risk associated with derivative financial instruments that are subject to master netting agreements is measured on a net basis by counterparty portfolio. Forward loan sales agreements are based upon the amounts required to settle the contracts. Fair values for commitments to originate loans held for sale are based on fees currently charged to enter into similar agreements. Fair values for fixed-rate commitments consider the difference between current levels of interest rates and the committed rates.
	Valuation of Investment Securities
	The fair values of available-for-sale, held-to-maturity and trading securities are determined by: 1) obtaining quoted prices on nationally recognized securities exchanges when available (Level 1 inputs); 2) matrix pricing, which is a mathematical technique widely used in the financial markets to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs); and 3) for certain other debt securities that are not actively traded, custom discounted cash flow modeling (Level 3 inputs).
	As of March 31, 2015, Capital Bank held industrial revenue bonds which are floating rate issues. Since there is no active secondary market for the trading of the bonds, the Company has developed a model to estimate fair value. This model determines an appropriate discount rate for the bonds based on current market rates for liquid corporate bonds with an equivalent credit rating plus an estimated illiquidity factor, and calculates the present value of expected future cash flows using this discount rate.
	Mortgage Loans Held for Sale
	Mortgage loans held for sale are carried at the lower of cost or estimated fair value. The fair values of mortgage loans held for sale are based on commitments on hand from investors within the secondary market for loans with similar characteristics. As such, the fair value adjustment for mortgage loans held for sale is classified as nonrecurring Level 2.
	Valuation of Impaired Loans and Other Real Estate Owned
	The fair value of collateral dependent impaired loans with specific allocations of the allowance for loan and lease losses and other real estate owned is generally based on recent real estate appraisals and other available observable market information. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach.
	The Company generally uses independent external appraisers in this process who routinely make adjustments to adjust for differences between the comparable sales and income data available. Such adjustments are typically significant and result in a Level 3 classification of the inputs for determining fair value. The Company’s policy is to update appraisals, at a minimum, annually for classified assets, which include collateral dependent loans and OREO. The Company considers appraisals dated within the past 12 months to be current and do not typically make adjustments to such appraisals. In the Company’s process for reviewing third-party prepared appraisals, any differences of opinion on values, assumptions or adjustments to comparable sales data are typically reconciled directly with the independent appraiser prior to acceptance of the final appraisal.
	Sensitivity to Changes in Significant Unobservable Inputs
	As discussed above, as of March 31, 2015, the Company owns industrial revenue bonds, which require recurring fair value estimates categorized within Level 3 of the fair value hierarchy. The significant unobservable inputs used in the fair value measurement of these securities are incorporated in the discounted cash flow modeling valuation. Rates utilized in the modeling of these securities are estimated based upon a variety of factors including the market yields of other non-investment grade corporate debt. Significant changes in any inputs in isolation would result in significantly different fair value estimates.
	Assets and Liabilities Measured on a Recurring Basis
	Assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 are summarized below:
	(Dollars in thousands)						Fair Value Measurement Using:
			Total				Quoted Prices			Significant		Significant
							in Active			Other		Unobservable
							Markets for			Observable		Inputs
							Identical Assets			Inputs		(Level 3)
							(Level 1)			(Level 2)
	Assets
	Trading securities		$	2,853			$	—		$	2,853	$	—
	Available-for-sale securities:
	Mortgage-backed securities—residential		549,572				—			549,572		—
	Industrial revenue bonds		3,537				—			—		3,537
	Corporate bonds		22,484				—			22,484		—
	Available-for-sale securities		$	575,593			$	—		$	572,056	$	3,537
	Gross asset value of derivatives		$	703			$	—		$	703	$	—
	Liabilities
	Gross liability value of derivatives		$	73			$	—		$	73	$	—
	There were no transfers of assets and liabilities between levels of the fair value hierarchy during the three months ended March 31, 2015.
	Assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 are summarized below:
	(Dollars in thousands)						Fair Value Measurement Using:
			Total				Quoted Prices			Significant		Significant
							in Active			Other		Unobservable
							Markets for			Observable		Inputs
							Identical Assets			Inputs		(Level 3)
							(Level 1)			(Level 2)
	Assets
	Trading securities		$	2,410			$	—		$	2,410	$	—
	Available-for-sale securities:
	Mortgage-backed securities-residential		552,203				—			552,203		—
	Industrial revenue bonds		3,690				—			—		3,690
	Available-for-sale securities		$	555,893			$	—		$	552,203	$	3,690
	Gross asset value of derivatives		$	4			$	—		$	4	$	—
	Liabilities
	Gross liability value of derivatives		$	26			$	—		$	26	$	—
	There were no transfers of assets and liabilities between levels of the fair value hierarchy during the year ended December 31, 2014.
	The table below presents the activity and income statement classifications of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended and held at March 31, 2015:
	(Dollars in thousands)			Fair Value Measurement Using Significant
				Unobservable Inputs (Level 3)
				Industrial
				Revenue
				Bonds
	Beginning balance, January 1, 2015			$	3,690
Principal reduction			(170		)
Included in other comprehensive income			17
Ending balance, March 31, 2015			$	3,537
The table below presents the activity and income statement classifications of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended and held at March 31, 2014:
(Dollars in thousands)			Fair Value Measurement Using Significant
			Unobservable Inputs (Level 3)
			Industrial
			Revenue
			Bonds
Beginning balance, January 1, 2014			$	3,859
Principal reduction			(170		)
Included in other comprehensive income			38
Ending balance, March 31, 2014			$	3,727
Quantitative Information about Recurring Level 3 Fair Value Measurements
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant	Range
		March 31, 2015						Unobservable
								Input
Industrial revenue bonds		$	3,537			Discounted cash flow		Discount rate	3.06% - 3.09%
								Illiquidity factor	0.50%
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant	Range
		December 31, 2014						Unobservable
								Input
Industrial revenue bonds		$	3,690			Discounted cash flow		Discount rate	3.5% - 3.6%
								Illiquidity factor	0.50%
Assets and Liabilities Measured on a Nonrecurring Basis
Assets and liabilities measured at fair value on a nonrecurring basis as of March 31, 2015 are summarized below:
(Dollars in thousands)		Fair Value Measurement Using:
		Quoted Prices in				Significant			Significant
		Active Markets				Other			Unobservable
		for Identical				Observable			Inputs
		Assets				Inputs			(Level 3)
		(Level 1)				(Level 2)
Assets
Other real estate owned		$	—			$	—		$	54,862
Other repossessed assets		—				301			—
Impaired loans		—				—			625
Other real estate owned measured at fair value as of March 31, 2015 had a carrying amount of $73.2 million, less valuation allowances totaling $18.4 million. Other repossessed assets are primarily comprised of repossessed vehicles and equipment and are measured at fair value as of the date of repossession.
Assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2014 are summarized below:
(Dollars in thousands)		Fair Value Measurement Using:
		Quoted Prices in				Significant			Significant
		Active Markets				Other			Unobservable
		for Identical				Observable			Inputs
		Assets				Inputs			(Level 3)
		(Level 1)				(Level 2)
Assets
Other real estate owned		$	—			$	—		$	66,048
Other repossessed assets		—				150			—
Impaired loans		—				—			754
Other real estate owned measured at fair value as of December 31, 2014 had a carrying amount of $85.1 million, less valuation allowances totaling $19.1 million. Other repossessed assets are primarily comprised of repossessed vehicles and equipment and are measured at fair value as of the date of repossession.
Quantitative Information about Nonrecurring Level 3 Fair Value Measurements
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant Unobservable Input	Weighted Average
		March 31, 2015
Other real estate owned		$	54,862			Fair value of property		Appraised value less cost to sell	7.85%
Impaired loans		625				Fair value of collateral		Appraised value less cost to sell	7.70%
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant Unobservable Input	Weighted Average
		December 31, 2014
Other real estate owned		$	66,048			Fair value of property		Appraised value less cost to sell	7.86%
Impaired loans		754				Fair value of collateral		Appraised value less cost to sell	7.60%
Carrying amount and estimated fair values of financial instruments were as follows:
(Dollars in thousands)		Fair Value Measurement
March 31, 2015		Carrying Value				Estimated			Level 1		Level 2		Level 3
						Fair Value
Financial Assets
Cash and cash equivalents		$	239,981			$	239,981		$	239,981	$	—	$	—
Trading securities		2,853				2,853			—		2,853		—
Investment securities available-for-sale		575,593				575,593			—		572,056		3,537
Investment securities held-to-maturity		448,962				457,939			—		457,939		—
Loans, net		5,029,784				5,144,700			—		12,403		5,132,297
FDIC indemnification asset		15,195				15,195			—		—		15,195
Receivable from FDIC		3,172				3,172			—		3,172		—
Other earning assets (1)		52,941				52,941			—		—		52,941
Gross asset value of derivatives		703				703			—		703		—
Total financial assets		$	6,369,184			$	6,493,077		$	239,981	$	1,049,126	$	5,203,970
Financial Liabilities
Non-contractual deposits		$	3,935,435			$	3,935,435		$	—	$	—	$	3,935,435
Contractual deposits		1,428,121				1,426,066			—		—		1,426,066
Federal Home Loan Bank advances		356,043				353,002			—		353,002		—
Short-term borrowings		27,605				27,605			—		27,605		—
Long-term borrowings		52,295				54,148			—		—		54,148
Subordinated debentures		87,680				91,487			—		—		91,487
Gross liability value of derivatives		73				73			—		73		—
Total financial liabilities		$	5,887,252			$	5,887,816		$	—	$	380,680	$	5,507,136
(Dollars in thousands)		Fair Value Measurement
December 31, 2014		Carrying Value				Estimated			Level 1		Level 2		Level 3
						Fair Value
Financial Assets
Cash and cash equivalents		$	188,135			$	188,135		$	188,135	$	—	$	—
Trading securities		2,410				2,410			—		2,410		—
Investment securities available-for-sale		555,893				555,893			—		552,203		3,690
Investment securities held-to-maturity		436,962				443,379			—		443,379		—
Loans, net		4,950,008				5,058,352			—		5,516		5,052,836
FDIC indemnification asset		16,762				16,762			—		—		16,762
Receivable from FDIC		3,661				3,661			—		3,661		—
Other earning assets (1)		50,943				50,943			—		—		50,943
Gross asset value of derivatives		4				4			—		4		—
Total financial assets		$	6,204,778			$	6,319,539		$	188,135	$	1,007,173	$	5,124,231
Financial Liabilities
Non-contractual deposits		$	3,836,400			$	3,836,400		$	—	$	—	$	3,836,400
Contractual deposits		1,418,700				1,415,122			—		—		1,415,122
Federal Home Loan Bank advances		296,091				296,038			—		296,038		—
Short-term borrowings		23,407				23,407			—		23,407		—
Long-term borrowings		52,526				54,235			—		—		54,235
Subordinated debentures		87,155				97,913			—		—		97,913
Gross liability value of derivatives		26				26			—		26		—
Total financial liabilities		$	5,714,305			$	5,723,141		$	—	$	319,471	$	5,403,670
(1) Includes Federal Reserve Bank, Federal Home Loan Bank and Bankers Bank stocks.
The methods and assumptions used to estimate fair value are described as follows:
Carrying amount is the estimated fair value for cash and cash equivalents, receivable from FDIC, derivatives, noncontractual demand deposits and certain short-term borrowings. As it is not practicable to determine the fair value of Federal Reserve, Federal Home Loan Bank stock, FDIC indemnification asset and correspondent bank’s stocks due to restrictions placed on transferability, the estimated fair value is equal to their carrying amount. Security fair values are based on market prices or dealer quotes and, if no such information is available, on the rate and term of the security and information about the issuer including estimates of discounted cash flows when necessary. For fixed rate loans or contractual deposits and for variable rate loans or deposits with infrequent repricing or repricing limits, fair value is based on discounted cash flows using current market rates applied to the estimated life, adjusted for the allowance for loan and lease losses. Fair values for impaired loans are estimated using discounted cash flow analysis or underlying collateral values. Fair value of long-term debt is based on current rates for similar financing. The fair value of off-balance sheet items that include commitments to extend credit to fund commercial, consumer, real estate construction and real estate-mortgage loans and to fund standby letters of credit is considered nominal.

Derivative_and_Hedging_Activit

Derivative and Hedging Activities	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities
	The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates.
	The Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting.
	During the three months ended March 31, 2015, the company entered into a LIBOR-based interest rate swap with the objective of limiting the variability of interest payment cash flows resulting from changes in the benchmark interest rate LIBOR for a period of five years . This interest rate swap is designated as a cash flow hedge involving the receipt of fixed-rate amounts from a counterparty in exchange for the Company making variable-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of the derivatives is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Any ineffective portion of a financial instrument’s change in fair value is immediately recognized in earnings.
	During the next twelve months, the Company estimates that an additional $0.9 million will be reclassified as an increase to interest income from amounts reported in accumulated comprehensive income. During the three months ended March 31, 2015, no derivative position designated as cash flow hedges were discontinued and none of the gains and losses reported in other comprehensive income were reclassified into earnings as a result of discontinuance of cash flow hedges.
	The Company also enters into forward loan sales contracts, which are derived from loans held for sale, or in the Company’s pipeline, to enable those borrowers to manage their exposure to interest rate fluctuations. The interest rate derivative contracts are not designated as hedging instruments or otherwise qualify for hedge accounting treatment and all changes in fair value are recognized in non-interest income or non-interest expense during the period of change. For the three months ended March 31, 2015, the Company recorded $5 thousand in non-interest income and $47 thousand in non-interest expense as a result of changes in fair value of derivatives. For the three months ended March 31, 2014, the company recorded $1.1 million in non-interest income and $0.9 million in non-interest expense as a result of changes in fair value of derivatives.
	The Company’s derivative instrument contracts at fair value as well as their classification on the Company's balance sheet is presented below:
	(Dollars in thousands)				31-Mar-15						December 31, 2014
		Number of instruments		Balance Sheet Location	Fair Value			Notional			Fair Value				Notional
								Amount							Amount
	Asset derivatives
	Derivatives designated as hedging instruments
	Interest rate swap	1		Other assets	$	695		$	70,000		$	—			$	—
	Derivatives not designated as hedging instruments
	Forward loan sales contracts	9		Other assets	8			2,454			4				1,640
	Total asset derivatives				$	703		$	72,454		$	4			$	1,640
	Liability derivatives
	Derivatives designated as hedging instruments
	Interest rate swap	—		Other liabilities	$	—		$	—		$	—			$	—
	Derivatives not designated as hedging instruments
	Forward loan sales contracts	75		Other liabilities	73			15,478			26				7,578
	Total liability derivatives				$	73		$	15,478		$	26			$	7,578
	The table below present the effect off the Company's derivative financial instruments on the Consolidated Statements of Income for the three months ended March 31, 2015:
	(Dollars in thousands)
	Derivatives in Cash Flow Hedging Relationship		Amount of Gain Recognized in Accumulated OCI on Derivative (Effective Portion)				Location of Gain Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain Reclassified from Accumulated OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)		Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
	Interest rate swap		$	803			Interest income	$	108		N/A		$	—
	The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company's derivatives as of March 31, 2015:
												Gross Amounts Not Offset in the Balance Sheets
	(Dollars in thousands)	Gross Amount of Recognized Assets				Gross Amount Offset in the Balance Sheets			Net Amount of Assets Presented in the Balance Sheets			Financial Instruments				Cash Collateral Received		Net Amount
	Offsetting of derivative assets:
	Interest rate swap	$	695			$	—		$	695		$	—			$	560	$	135
	Total	$	695			$	—		$	695		$	—			$	560	$	135
	Offsetting of derivative liabilities:
	Interest rate swap	$	—			$	—		$	—		$	—			$	—	$	—
	Total	$	—			$	—		$	—		$	—			$	—	$	—
	The Company has agreements with each of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness or fails to maintain its status as a well capitalized institution, then the Company could also be declared in default on its derivative obligations and could be required to terminate its derivative positions with the counterparty.
	As of March 31, 2015, the fair value of cash flow derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $0. The Company is exposed to credit-related losses in the event of nonperformance by the counterparties to these agreements. The Company controls the credit risk of its financial contracts through credit approvals, limits and monitoring procedures and agreements that specify collateral levels to be maintained by the Company and the counterparties. These collateral levels are based on the credit rating of the counterparties.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Nature of Operations and Principles of Consolidation	Capital Bank Financial Corp. (“CBF” or the “Company”; formerly known as North American Financial Holdings, Inc.) is a bank holding company incorporated in late 2009 in Delaware and headquartered in Florida whose business is conducted primarily through Capital Bank, National Association (“Capital Bank, NA” or the “Bank”). The Company was incorporated with the goal of creating a regional banking franchise in the southeastern region of the United States through organic growth and acquisitions of other banks, including failed, underperforming and undercapitalized banks. CBF has raised $955.6 million to make acquisitions through a series of private placements and an initial public offering of its common stock. Since inception, CBF has acquired seven depository institutions, including the assets and certain deposits from failed banks. CBF has a total of 162 full service banking offices located in Florida, North and South Carolina, Tennessee and Virginia. Through its branches CBF offers a wide range of commercial and consumer loans and deposits, as well as ancillary financial services.
	The accompanying unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Regulation S-X. Accordingly, they do not include all of the information and disclosures required by U.S. GAAP for complete financial statement presentation. In the opinion of management, all adjustments consisting of normal recurring accruals and disclosures considered necessary for a fair interim presentation have been included. All significant inter-company accounts and transactions have been eliminated in consolidation. For further information, refer to the Company’s Consolidated Financial Statements and notes thereto included in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2014.
	Certain prior period amounts have been reclassified to conform to the current period presentation.
Use of Estimates and Assumptions	To prepare financial statements in conformity with U. S. GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as presented in the financial statements. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. Material estimates that are particularly susceptible to significant change include the determination of the allowance for loan and lease losses, including estimates of expected cash flows for impaired loans, determination of fair value, determination of impairment of financial instruments, goodwill and intangible assets and the determination of deferred income tax assets and liabilities. Changes in assumptions or in market conditions could significantly affect the fair value estimates.
Recent Accounting Pronouncements	In April 2015, the Financial Accounting Standard Board (the “FASB”) issued Accounting Standards Update ("ASU") 2015-3, "Interest - Imputation of interest" (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs". The amendments in ASU 2015-3 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update. The amendments in ASU 2015-3 are effective for financial statements issued for fiscal years beginning after December 31, 2015, and interim periods within those fiscal years. The adoption of ASU 2015-3 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In November 2014, the FASB issued ASU 2014-16, “Derivative and Hedging” (Topic 815)”. The amendments in ASU 2014-16 do not change the current criteria in GAAP for determining when separation of certain embedded derivative features in a hybrid financial instrument is required, but clarifies how current GAAP should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. Specifically, the amendments explain that an entity should consider all relevant terms and features in evaluating the nature of the host contract. Furthermore, the amendments specify that no single term or feature would necessarily determine the economic characteristics and risks of the host contract. Rather, the nature of the host contract depends upon the economic characteristics and risks of the entire hybrid financial instrument. In addition, the amendments clarify that, in evaluating the nature of a host contract, an entity should assess the substance of the relevant terms and features. The amendments in ASU 2014-16 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The adoption of ASU 2014-16 is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.
	In August 2014, the FASB issued ASU 2014-15, "Presentation of Financial Statements-Going Concern (Subtopic 205-40)—Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern". The amendments in ASU 2014-15 provide guidance in U.S. GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The amendments in ASU 2014-15 apply to all entities and will be effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. The adoption of ASU 2014-15 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In August 2014, the FASB issued ASU 2014-14, "Receivables—Troubled Debt Restructuring by Creditors (Subtopic 310-40)—Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure". The amendment in ASU 2014-14 requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if certain conditions are met. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in ASU 2014-14 affect creditors that hold government-guaranteed mortgage loans, including those guaranteed by the Federal Housing Administration ("FHA") of the U.S. Department of Housing and Urban Development ("HUD"), and the U.S. Department of Veterans Affairs ("VA"). ASU 2014-14 will be effective for the annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The adoption of ASU 2014-14 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In June 2014, the FASB issued ASU No. 2014-12, “Compensation- Stock Compensation (Topic 718)—Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could be Achieved after the Requisite Service Period”. ASU 2014-12 provides specific guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. ASU 2014-12 is effective for fiscal years and interim periods beginning after December 15, 2015. The adoption of ASU 2014-12 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In June 2014, the FASB issued ASU No. 2014-11, “Transfers and Servicing (topic 860)—Repurchase-to-Maturity Transactions, Repurchase Financing, and Disclosures”. ASU 2014-11 changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.
	The accounting changes in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after December 15, 2015. The adoption of ASU 2014-11 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.  Disclosures for repurchase agreements, securities lending transactions and repurchase-to-maturities transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after December 15, 2015. These disclosures are not expected to have a material impact on the Company's consolidated financial position, results of operations or cash flows.
	In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contracts with Customers (Topic 606)”. ASU 2014-9 clarifies the principles for recognizing revenue from contracts with customers. ASU 2014-9, which does not apply to financial instruments, is effective for interim and annual reporting periods beginning after December 15, 2016. The Company is currently evaluating ASU 2014-9 to determine the impact on its consolidated financial position, results of operations and cash flows.
	In January 2014, the FASB issued ASU 2014-4, “Receivables—Troubled Debt Restructuring by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force).” ASU 2014-4 clarifies that when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed-in-lieu of foreclosure or through a similar legal agreement. ASU 2014-4 is effective for fiscal years and interim periods beginning after December 15, 2014. The adoption of ASU 2014-4 did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following:
	(Shares in thousands)	Three Months Ended
		31-Mar-15	31-Mar-14
	Weighted average number of shares outstanding:
	Basic	46,294	50,518
	Dilutive effect of options outstanding	676	970
	Dilutive effect of unvested restricted shares	662	444
	Diluted	47,632	51,932
Weighted Average Anti-Dilutive Stock Options and Unvested Restricted Shares Excluded from the Computation of Diluted Earnings Per Share	Weighted average anti-dilutive stock options and unvested restricted shares excluded from the computation of diluted earnings per share are as follows:
	(Shares in thousands)	Three Months Ended
		31-Mar-15	31-Mar-14
	Anti-dilutive stock options	10	15
	Anti-dilutive unvested restricted shares	—	—

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity	The amortized cost and estimated fair value of investment securities available-for-sale and held-to-maturity at March 31, 2015 and December 31, 2014, are presented below:
	(Dollars in thousands)	31-Mar-15
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Available-for-Sale
	Corporate bonds	$	22,588	$	13	$	117	$	22,484
	Mortgage-backed securities—residential issued by government sponsored entities	542,624		$	7,415	467		549,572
	Industrial revenue bonds	3,409		128		—		3,537
	Total	$	568,621	$	7,556	$	584	$	575,593
	Held-to-Maturity
	U.S. Government agencies	$	13,709	$	295	$	—	$	14,004
	Corporate bonds	30,071		294		23		30,342
	State and political subdivisions—tax exempt	11,922		524		8		12,438
	State and political subdivisions—taxable	535		29		—		564
	Mortgage-backed securities—residential issued by government sponsored entities	392,725		7,907		41		400,591
	Total	$	448,962	$	9,049	$	72	$	457,939
	(Dollars in thousands)	December 31, 2014
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Available-for-Sale
	Mortgage-backed securities—residential issued by government sponsored entities	$	550,908	$	3,127	$	1,832	$	552,203
	Industrial revenue bonds	3,580		110		—		3,690
	Total	$	554,488	$	3,237	$	1,832	$	555,893
	Held-to-Maturity
	U.S. Government agencies	$	13,989	$	230	$	—	$	14,219
	Corporate bonds	25,000		163		—		25,163
	State and political subdivisions—tax exempt	13,008		431		3		13,436
	State and political subdivisions—taxable	537		26		—		563
	Mortgage-backed securities—residential issued by government sponsored entities	384,428		5,626		56		389,998
	Total	$	436,962	$	6,476	$	59	$	443,379
Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity by Contractual Maturity	The estimated fair value of investment securities at March 31, 2015, by contractual maturity, is shown in the table that follows. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations without call or prepayment penalties. Debt securities not due at a single maturity date are shown separately.
	(Dollars in thousands)	31-Mar-15
		Amortized		Estimated		Yield
		Cost		Fair Value
	Available-for-sale
	Due in one year or less	$	—	$	—	—	%
	Due after one year through five years	—		—		—	%
	Due after five years through ten years	—		—		—	%
	Due after ten years	25,997		26,021		2.42	%
	Mortgage-backed securities—residential issued by government sponsored entities	542,624		549,572		1.92	%
	Total	$	568,621	$	575,593	1.94	%
		Amortized		Estimated		Yield
		Cost		Fair Value
	Held-to-maturity
	Due in one year or less	$	203	$	203	0.77	%
	Due after one year through five years	16,267		16,368		4.59	%
	Due after five years through ten years	25,523		26,210		4.53	%
	Due after ten years	14,244		14,567		2.88	%
	Mortgage-backed securities—residential issued by government sponsored entities	392,725		400,591		2.4	%
	Total	$	448,962	$	457,939	2.62	%
Securities with Unrealized Losses Not Recognized in Income	Securities with unrealized losses not recognized in income, and the period of time they have been in an unrealized loss position, are as follows:
	(Dollars in thousands)	Less than 12 Months				12 Months or Longer				Total
	31-Mar-15	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Available-for-Sale
	Corporate bonds	$	14,109	$	117	$	—	$	—	$	14,109	$	117
	Mortgage-backed securities—residential issued by government sponsored entities	63,213		342		11,248		125		74,461		467
	Total	$	77,322	$	459	$	11,248	$	125	$	88,570	$	584
	Held-to-Maturity
	Corporate bonds	$	5,048	$	23	$	—	$	—	$	5,048	$	23
	State and political subdivisions—tax exempt	1,000		8		—		—		1,000		8
	Mortgage-backed securities—residential issued by government sponsored entities	3,445		41		—		—		3,445		41
	Total	$	9,493	$	72	$	—	$	—	$	9,493	$	72
	(Dollars in thousands)	Less than 12 Months				12 Months or Longer				Total
	December 31, 2014	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Available-for-Sale
	Mortgage-backed securities—residential issued by government sponsored entities	$	215,139	$	1,596	$	28,439	$	236	$	243,578	$	1,832
	Total	$	215,139	$	1,596	$	28,439	$	236	$	243,578	$	1,832
	Held-to-Maturity
	State and political subdivisions—tax exempt	$	896	$	3	$	—	$	—	$	896	$	3
	Mortgage-backed securities—residential issued by government sponsored entities	13,995		56		—		—		13,995		56
	Total	$	14,891	$	59	$	—	$	—	$	14,891	$	59

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Major Classifications of Loans	Major classifications of loans, including loans held for sale, are as follows:
	(Dollars in thousands)		31-Mar-15				31-Dec-14
	Non-owner occupied commercial real estate		$	823,763			$	798,556
	Other commercial construction and land		180,166				200,755
	Multifamily commercial real estate		88,980				89,132
	1-4 family residential construction and land		66,547				68,658
	Total commercial real estate		1,159,456				1,157,101
	Owner occupied commercial real estate		1,038,493				1,046,736
	Commercial and industrial		1,125,708				1,073,791
	Lease financing		1,834				2,005
	Total commercial		2,166,035				2,122,532
	1-4 family residential		928,832				925,698
	Home equity loans		379,946				378,475
	Other consumer loans		296,753				272,453
	Total consumer		1,605,531				1,576,626
	Other		146,987				143,960
	Total loans		$	5,078,009			$	5,000,219
Roll Forward of Accretable Yield	The table below presents a roll forward of accretable yield and income expected to be earned related to PCI loans and the amount of non-accretable difference at the end of the period. Nonaccretable difference represents estimated contractually required payments in excess of estimated cash flows expected to be collected. The accretable yield represents the excess of estimated cash flows expected to be collected over the carrying amount of the PCI loans. Other represents reductions of accretable yield due to non-credit events such as interest rate reductions on variable rate PCI loans and prepayment activity on PCI loans.
	(Dollars in thousands)		Three Months Ended
			31-Mar-15				31-Mar-14
	Accretable Yield
	Balance at beginning of period		$	292,633			$	383,775
	Accretion of income		(24,840		)		(33,162		)
	Reclassification from nonaccretable difference		26,517				6,667
	Other		(48,201		)		(10,285		)
	Balance at end of period		$	246,109			$	346,995
	Nonaccretable difference, balance at the end of the period		$	207,762			$	253,865
Major Categories of Loans	The following is a summary of the major categories of non-covered loans outstanding as of March 31, 2015 and December 31, 2014:
	(Dollars in thousands)		Non-PCI Loans
	March 31, 2015		New				Acquired				PCI Loans			Total
														Non-covered
														Loans
	Non-owner occupied commercial real estate		$	401,128			$	56,303			$	335,812		$	793,243
	Other commercial construction and land		67,723				144				101,489			169,356
	Multifamily commercial real estate		49,598				11,004				23,768			84,370
	1-4 family residential construction and land		60,822				—				4,857			65,679
	Total commercial real estate		579,271				67,451				465,926			1,112,648
	Owner occupied commercial real estate		744,802				37,107				210,403			992,312
	Commercial and industrial loans		1,023,319				9,276				86,221			1,118,816
	Lease financing		1,834				—				—			1,834
	Total commercial		1,769,955				46,383				296,624			2,112,962
	1-4 family residential		577,772				41,413				259,705			878,890
	Home equity loans		114,890				149,352				78,062			342,304
	Other consumer loans		287,488				4,403				4,756			296,647
	Total consumer		980,150				195,168				342,523			1,517,841
	Other		105,615				3,563				36,983			146,161
	Total loans		$	3,434,991			$	312,565			$	1,142,056		$	4,889,612
	(Dollars in thousands)		Non-PCI Loans
	December 31, 2014		New				Acquired				PCI Loans			Total
														Non-covered
														Loans
	Non-owner occupied commercial real estate		$	372,793			$	58,552			$	333,433		$	764,778
	Other commercial construction and land		66,817				161				123,398			190,376
	Multifamily commercial real estate		47,765				12,327				24,377			84,469
	1-4 family residential construction and land		58,046				—				9,742			67,788
	Total commercial real estate		545,421				71,040				490,950			1,107,411
	Owner occupied commercial real estate		745,728				38,122				215,059			998,909
	Commercial and industrial loans		958,628				10,564				97,228			1,066,420
	Lease financing		2,005				—				—			2,005
	Total commercial		1,706,361				48,686				312,287			2,067,334
	1-4 family residential		560,106				43,921				269,768			873,795
	Home equity loans		103,644				152,797				82,121			338,562
	Other consumer loans		261,935				4,647				5,772			272,354
	Total consumer		925,685				201,365				357,661			1,484,711
	Other		99,610				3,603				39,903			143,116
	Total loans		$	3,277,077			$	324,694			$	1,200,801		$	4,802,572
	Covered Loans
	The following is a summary of the major categories of covered loans outstanding as of March 31, 2015, and December 31, 2014:
	(Dollars in thousands)		Non-PCI Loans
	March 31, 2015		New				Acquired				PCI Loans			Total
														Covered
														Loans
	Non-owner occupied commercial real estate		$	—			$	—			$	30,520		$	30,520
	Other commercial construction and land		—				—				10,810			10,810
	Multifamily commercial real estate		—				—				4,610			4,610
	1-4 family residential construction and land		—				—				868			868
	Total commercial real estate		—				—				46,808			46,808
	Owner occupied commercial real estate		—				—				46,181			46,181
	Commercial and industrial loans		—				211				6,681			6,892
	Lease financing		—				—				—			—
	Total commercial		—				211				52,862			53,073
	1-4 family residential		—				1,400				48,542			49,942
	Home equity loans		—				28,758				8,884			37,642
	Other consumer loans		—				—				106			106
	Total consumer		—				30,158				57,532			87,690
	Other		—				—				826			826
	Total loans		$	—			$	30,369			$	158,028		$	188,397
	(Dollars in thousands)		Non-PCI Loans
	December 31, 2014		New				Acquired				PCI Loans			Total Covered
														Loans
	Non-owner occupied commercial real estate		$	—			$	—			$	33,778		$	33,778
Other commercial construction and land		—				—				10,379			10,379
Multifamily commercial real estate		—				—				4,663			4,663
1-4 family residential construction and land		—				—				870			870
Total commercial real estate		—				—				49,690			49,690
Owner occupied commercial real estate		—				—				47,827			47,827
Commercial and industrial loans		—				214				7,157			7,371
Lease financing		—				—				—			—
Total commercial		—				214				54,984			55,198
1-4 family residential		—				1,512				50,391			51,903
Home equity loans		—				30,473				9,440			39,913
Other consumer loans		—				—				99			99
Total consumer		—				31,985				59,930			91,915
Other		—				—				844			844
Total loans		$	—			$	32,199			$	165,448		$	197,647
Aging of the Recorded Investment in Past Due Loans, Based on Contractual Terms	The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of March 31, 2015:
	(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
										and Still Accruing/Accreting
	Non-purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
	Non-owner occupied commercial real estate	$	—			$	—			$	—		$	—		$	648	$	—	$	648
	Other commercial construction and land	143				—				—			—			383		—		526
	Multifamily commercial real estate	—				—				—			—			—		—		—
	1-4 family residential construction and land	106				—				—			—			—		—		106
	Total commercial real estate	249				—				—			—			1,031		—		1,280
	Owner occupied commercial real estate	229				—				—			—			4,380		—		4,609
	Commercial and industrial loans	54				—				—			—			1,561		65		1,680
	Lease financing	—				—				—			—			—		—		—
	Total commercial	283				—				—			—			5,941		65		6,289
	1-4 family residential	654				—				—			—			1,628		66		2,348
	Home equity loans	568				73				—			—			1,466		408		2,515
	Other consumer loans	2,733				—				—			—			877		—		3,610
	Total consumer	3,955				73				—			—			3,971		474		8,473
	Other	473				—				—			—			—		—		473
	Total loans	$	4,960			$	73			$	—		$	—		$	10,943	$	539	$	16,515
	(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
										and Still Accruing/Accreting
	Purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
	Non-owner occupied commercial real estate	$	501			$	—			$	13,492		$	1,812		$	—	$	—	$	15,805
	Other commercial construction and land	142				41				26,263			4,811			—		—		31,257
	Multifamily commercial real estate	526				—				2,037			—			—		—		2,563
	1-4 family residential construction and land	—				—				724			—			—		—		724
	Total commercial real estate	1,169				41				42,516			6,623			—		—		50,349
	Owner occupied commercial real estate	976				11				14,454			1,123			—		—		16,564
	Commercial and industrial loans	276				9				22,161			—			—		—		22,446
	Lease financing	—				—				—			—			—		—		—
	Total commercial	1,252				20				36,615			1,123			—		—		39,010
	1-4 family residential	2,364				65				19,160			3,621			—		—		25,210
	Home equity loans	765				71				3,934			1,248			—		—		6,018
	Other consumer loans	123				—				155			27			—		—		305
	Total consumer	3,252				136				23,249			4,896			—		—		31,533
	Other	111				—				843			—			—		—		954
	Total loans	$	5,784			$	197			$	103,223		$	12,642		$	—	$	—	$	121,846
	The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of December 31, 2014:
	(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
										and Still Accruing/Accreting
	Non-purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
	Non-owner occupied commercial real estate	$	—			$	—			$	—		$	—		$	534	$	—	$	534
	Other commercial construction and land	31				—				—			—			233		—		264
	Multifamily commercial real estate	—				—				—			—			—		—		—
	1-4 family residential construction and land	—				—				—			—			—		—		—
	Total commercial real estate	31				—				—			—			767		—		798
	Owner occupied commercial real estate	744				—				—			—			2,524		—		3,268
	Commercial and industrial loans	70				—				—			—			1,654		66		1,790
	Lease financing	—				—				—			—			—		—		—
	Total commercial	814				—				—			—			4,178		66		5,058
	1-4 family residential	357				—				—			—			1,284		69		1,710
	Home equity loans	627				225				—			—			1,758		443		3,053
	Other consumer loans	2,508				—				—			—			909		—		3,417
	Total consumer	3,492				225				—			—			3,951		512		8,180
	Other	30				—				—			—			10		—		40
	Total loans	$	4,367			$	225			$	—		$	—		$	8,906	$	578	$	14,076
	(Dollars in thousands)	30-89 Days Past Due								Greater than 90 Days Past Due						Non-accrual
										and Still Accruing/Accreting
	Purchased credit impaired loans	Non-Covered				Covered				Non-Covered			Covered			Non-Covered		Covered		Total
	Non-owner occupied commercial real estate	$	164			$	—			$	14,943		$	1,636		$	—	$	—	$	16,743
	Other commercial construction and land	199				—				24,602			4,043			—		—		28,844
	Multifamily commercial real estate	—				—				1,924			—			—		—		1,924
	1-4 family residential construction and land	—				—				873			—			—		—		873
	Total commercial real estate	363				—				42,342			5,679			—		—		48,384
Owner occupied commercial real estate	1,472				—				15,189			1,131			—		—		17,792
Commercial and industrial loans	195				—				23,115			63			—		—		23,373
Lease financing	—				—				—			—			—		—		—
Total commercial	1,667				—				38,304			1,194			—		—		41,165
1-4 family residential	1,820				115				21,224			4,682			—		—		27,841
Home equity loans	1,042				21				3,614			1,300			—		—		5,977
Other consumer loans	112				—				174			27			—		—		313
Total consumer	2,974				136				25,012			6,009			—		—		34,131
Other	118				—				2,597			—			—		—		2,715
Total loans	$	5,122			$	136			$	108,255		$	12,882		$	—	$	—	$	126,395
Loans, Excluding Purchased Credit-Impaired Loans by Internal Ratings	The following table summarizes loans, excluding PCI loans by internal rating at March 31, 2015:
										Substandard
	(Dollars in thousands)	Pass				Special Mention				Accruing/			Non-accrual			Doubtful		Total
										Accreting
	Non-owner occupied commercial real estate	$	455,114			$	21			$	1,648		$	648		$	—	$	457,431
	Other commercial construction and land	67,408				46				30			383			—		67,867
	Multifamily commercial real estate	60,602				—				—			—			—		60,602
	1-4 family residential construction and land	57,505				2,119				1,198			—			—		60,822
	Total commercial real estate	640,629				2,186				2,876			1,031			—		646,722
	Owner occupied commercial real estate	767,745				7,225				2,558			4,381			—		781,909
	Commercial and industrial loans	1,026,075				2,832				2,273			1,626			—		1,032,806
	Lease financing	1,834				—				—			—			—		1,834
	Total commercial	1,795,654				10,057				4,831			6,007			—		1,816,549
	1-4 family residential	616,470				263				2,158			1,694			—		620,585
	Home equity loans	288,988				58				2,081			1,873			—		293,000
	Other consumer loans	291,014				—				—			877			—		291,891
	Total consumer	1,196,472				321				4,239			4,444			—		1,205,476
	Other	108,705				473				—			—			—		109,178
	Total loans	$	3,741,460			$	13,037			$	11,946		$	11,482		$	—	$	3,777,925
	The following table summarizes loans, excluding PCI loans by internal rating at December 31, 2014:
										Substandard
	(Dollars in thousands)	Pass				Special Mention				Accruing/			Non-accrual			Doubtful		Total
										Accreting
	Non-owner occupied commercial real estate	$	429,126			$	835			$	850		$	534		$	—	$	431,345
	Other commercial construction and land	66,667				47				31			233			—		66,978
	Multifamily commercial real estate	60,092				—				—			—			—		60,092
	1-4 family residential construction and land	56,551				—				1,495			—			—		58,046
	Total commercial real estate	612,436				882				2,376			767			—		616,461
	Owner occupied commercial real estate	766,822				6,687				7,817			2,524			—		783,850
	Commercial and industrial loans	963,273				2,235				2,178			1,720			—		969,406
	Lease financing	2,005				—				—			—			—		2,005
	Total commercial	1,732,100				8,922				9,995			4,244			—		1,755,261
	1-4 family residential	601,738				283				2,165			1,353			—		605,539
	Home equity loans	282,597				59				2,057			2,201			—		286,914
	Other consumer loans	265,673				—				—			909			—		266,582
	Total consumer	1,150,008				342				4,222			4,463			—		1,159,035
	Other	102,730				473				—			10			—		103,213
	Total loans	$	3,597,274			$	10,619			$	16,593		$	9,484		$	—	$	3,633,970

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Allowance for Loan and Lease Losses	Activity in the allowance for loan and lease losses for the three months ended March 31, 2015 and 2014 is as follows:
	(Dollars in thousands)		Three Months Ended
			31-Mar-15				31-Mar-14
	Balance, beginning of period		$	50,211			$	56,851
	Reversal of provision for loan losses for PCI loans		(1,926		)		(2,488		)
	Provision for loan losses for non-PCI loans		1,085				2,464
	Non-PCI loans charged-off		(1,899		)		(1,956		)
	Recoveries of non-PCI loans previously charged-off		754				735
	Balance, end of period		$	48,225			$	55,606
	The following tables present the roll forward of the allowance for loan and lease losses for the three months ended March 31, 2015 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2014				Provision/				Net(Charge-offs)/				31-Mar-15
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	2,022			$	(135	)		$	3			$	1,890
	Other commercial construction and land		12,181				233				161				12,575
	Multifamily commercial real estate		252				(29		)		—				223
	1-4 family residential construction and land		1,102				(83		)		1				1,020
	Total commercial real estate		15,557				(14		)		165				15,708
	Owner occupied commercial real estate		2,504				183				(112		)		2,575
	Commercial and industrial loans		9,502				(382		)		97				9,217
	Lease financing		—				—				—				—
	Total commercial		12,006				(199		)		(15		)		11,792
	1-4 family residential		15,451				(1,710		)		(211		)		13,530
	Home equity loans		2,815				42				(68		)		2,789
	Other consumer loans		4,122				753				(733		)		4,142
	Total consumer		22,388				(915		)		(1,012		)		20,461
	Other		260				287				(283		)		264
	Total loans		$	50,211			$	(841	)		$	(1,145	)		$	48,225
	The following table presents the roll forward of the allowance for loan and lease losses for the three months ended March 31, 2014 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2013				Provision/				Net (Charge-offs)/				31-Mar-14
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	4,635			$	(819	)		$	13			$	3,829
	Other commercial construction and land		8,217				875				(200		)		8,892
	Multifamily commercial real estate		320				83				—				403
	1-4 family residential construction and land		1,558				2				(1		)		1,559
	Total commercial real estate		14,730				141				(188		)		14,683
	Owner occupied commercial real estate		4,450				(807		)		(113		)		3,530
	Commercial and industrial loans		8,310				(189		)		77				8,198
	Lease financing		3				(2		)		—				1
	Total commercial		12,763				(998		)		(36		)		11,729
	1-4 family residential		21,724				(1,323		)		(18		)		20,383
	Home equity loans		3,869				1,054				(48		)		4,875
	Other consumer loans		2,682				1,020				(639		)		3,063
	Total consumer		28,275				751				(705		)		28,321
	Other		1,083				82				(292		)		873
	Total loans		$	56,851			$	(24	)		$	(1,221	)		$	55,606
	The following tables present the roll forward of the allowance for loan and lease losses for PCI and non-PCI loans for the three months ended March 31, 2015 and 2014, by the class of loans against which the allowance is allocated:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15
		Non-PCI				PCI				Total
	Allowance for loan and lease losses at the beginning of the period	$	21,355			$	28,856			$	50,211
	Charge-offs:
	Non-owner occupied commercial real estate	—				—				—
	Other commercial construction and land	(8		)		—				(8		)
	Multifamily commercial real estate	—				—				—
	1-4 family residential construction and land	—				—				—
	Total commercial real estate	(8		)		—				(8		)
	Owner occupied commercial real estate	(112		)		—				(112		)
	Commercial and industrial loans	(54		)		—				(54		)
	Lease financing	—				—				—
	Total commercial	(166		)		—				(166		)
	1-4 family residential	(215		)		—				(215		)
	Home equity loans	(160		)		—				(160		)
	Other consumer loans	(867		)		—				(867		)
	Total consumer	(1,242		)		—				(1,242		)
Other	(483		)		—				(483		)
Total charge-offs	(1,899		)		—				(1,899		)
Recoveries:
Non-owner occupied commercial real estate	3				—				3
Other commercial construction and land	169				—				169
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	1				—				1
Total commercial real estate	173				—				173
Owner occupied commercial real estate	—				—				—
Commercial and industrial loans	151				—				151
Lease financing	—				—				—
Total commercial	151				—				151
1-4 family residential	4				—				4
Home equity loans	92				—				92
Other consumer loans	134				—				134
Total consumer	230				—				230
Other	200				—				200
Total recoveries	754				—				754
Net charge-offs	(1,145		)		—				(1,145		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	32				(167		)		(135		)
Other commercial construction and land	(204		)		437				233
Multifamily commercial real estate	(4		)		(25		)		(29		)
1-4 family residential construction and land	(29		)		(54		)		(83		)
Total commercial real estate	(205		)		191				(14		)
Owner occupied commercial real estate	300				(117		)		183
Commercial and industrial loans	(213		)		(169		)		(382		)
Lease financing	1				(1		)		—
Total commercial	88				(287		)		(199		)
1-4 family residential	107				(1,817		)		(1,710		)
Home equity loans	55				(13		)		42
Other consumer loans	747				6				753
Total consumer	909				(1,824		)		(915		)
Other	293				(6		)		287
Total provision (reversal) for loan and lease losses	1,085				(1,926		)		(841		)
Allowance for loan and lease losses at the end of the period	$	21,295			$	26,930			$	48,225
(Dollars in thousands)	Three Months Ended
	31-Mar-14
	Non-PCI				PCI				Total
Allowance for loan and lease losses at the beginning of the period	$	18,951			$	37,900			$	56,851
Charge-offs:
Non-owner occupied commercial real estate	—				—				—
Other commercial construction and land	(208		)		—				(208		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	(3		)		—				(3		)
Total commercial real estate	(211		)		—				(211		)
Owner occupied commercial real estate	(136		)		—				(136		)
Commercial and industrial loans	(55		)		—				(55		)
Lease financing	—				—				—
Total commercial	(191		)		—				(191		)
1-4 family residential	(21		)		—				(21		)
Home equity loans	(129		)		—				(129		)
Other consumer loans	(807		)		—				(807		)
Total consumer	(957		)		—				(957		)
Other	(597		)		—				(597		)
Total charge-offs	(1,956		)		—				(1,956		)
Recoveries:
Non-owner occupied commercial real estate	13				—				13
Other commercial construction and land	8				—				8
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	2				—				2
Total commercial real estate	23				—				23
Owner occupied commercial real estate	23				—				23
Commercial and industrial loans	132				—				132
Lease financing	—				—				—
Total commercial	155				—				155
1-4 family residential	3				—				3
Home equity loans	81				—				81
Other consumer loans	168				—				168
Total consumer	252				—				252
Other	305				—				305
Total recoveries	735				—				735
Net charge-offs	(1,221		)		—				(1,221		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	22				(841		)		(819		)
Other commercial construction and land	500				375				875
Multifamily commercial real estate	(11		)		94				83
1-4 family residential construction and land	(34		)		36				2
Total commercial real estate	477				(336		)		141
Owner occupied commercial real estate	222				(1,029		)		(807		)
Commercial and industrial loans	35				(224		)		(189		)
Lease financing	(1		)		(1		)		(2		)
Total commercial	256				(1,254		)		(998		)
1-4 family residential	254				(1,577		)		(1,323		)
Home equity loans	141				913				1,054
Other consumer loans	1,188				(168		)		1,020
Total consumer	1,583				(832		)		751
Other	148				(66		)		82
Total provision (reversal) for loan and lease losses	2,464				(2,488		)		(24		)
Allowance for loan and lease losses at the end of the period	$	20,194			$	35,412			$	55,606
The following table presents the balance in the allowance for loan and lease losses and the recorded investment in loans by class of loan and by impairment evaluation method as of March 31, 2015:
(Dollars in thousands)	Allowance for Loan and Lease Losses												Loans
	Individually				Collectively				Purchased				Individually			Collectively		Purchased
	Evaluated				Evaluated				Credit-				Evaluated			Evaluated		Credit-
	for				for				Impaired				for			for		Impaired
	Impairment				Impairment								Impairment			Impairment (1)
Non-owner occupied commercial real estate	$	—			$	1,598			$	292			$	464		$	456,967	$	366,332
Other commercial construction and land	—				1,369				11,206				—			67,867		112,299
Multifamily commercial real estate	—				122				101				—			60,602		28,378
1-4 family residential construction and land	—				710				310				—			60,822		5,725
Total commercial real estate	—				3,799				11,909				464			646,258		512,734
Owner occupied commercial real estate	302				2,015				258				4,667			777,242		256,584
Commercial and industrial loans	—				7,627				1,590				2,188			1,030,618		92,902
Lease financing	—				—				—				—			1,834		—
Total commercial	302				9,642				1,848				6,855			1,809,694		349,486
1-4 family residential	8				2,728				10,794				901			607,281		308,247
Home equity loans	18				608				2,163				625			292,375		86,946
Other consumer loans	9				3,835				298				252			291,639		4,862
Total consumer	35				7,171				13,255				1,778			1,191,295		400,055
Other					346				(82		)					109,178		37,809
Total loans	$	337			$	20,958			$	26,930			$	9,097		$	3,756,425	$	1,300,084
-1	Loans collectively evaluated for impairment include $341.6 million of acquired loans which are presented net of unamortized purchase discounts of $10.9 million.
The following table presents the balance in the allowance for loan and lease losses and the recorded investment in loans by class of loan and by impairment evaluation method as of December 31, 2014:
(Dollars in thousands)	Allowance for Loan and Lease Losses												Loans
	Individually				Collectively				Purchased				Individually			Collectively		Purchased
	Evaluated				Evaluated				Credit-				Evaluated			Evaluated		Credit-
	for				for				Impaired				for			for		Impaired
	Impairment				Impairment								Impairment			Impairment (1)
Non-owner occupied commercial real estate	$	—			$	1,563			$	459			$	—		$	431,345	$	367,211
Other commercial construction and land	—				1,411				10,770				—			66,978		133,777
Multifamily commercial real estate	—				126				126				—			60,092		29,040
1-4 family residential construction and land	—				739				363				—			58,046		10,612
Total commercial real estate	—				3,839				11,718				—			616,461		540,640
Owner occupied commercial real estate	—				2,129				375				3,423			780,427		262,886
Commercial and industrial loans	—				7,742				1,760				2,704			966,702		104,385
Lease financing	—				—				—				—			2,005		—
Total commercial	—				9,871				2,135				6,127			1,749,134		367,271
1-4 family residential	—				2,840				12,611				745			599,278		320,159
Home equity loans	—				639				2,176				325			286,589		91,561
Other consumer loans	15				3,815				292				221			266,361		5,871
Total consumer	15				7,294				15,079				1,291			1,152,228		417,591
Other	—				336				(76		)		—			103,213		40,747
Total loans	$	15			$	21,340			$	28,856			$	7,418		$	3,621,036	$	1,366,249
-1	Loans collectively evaluated for impairment include $355.4 million of acquired loans which are presented net of unamortized purchase discounts of $11.7 million.
Tr

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Schedule of FDIC Indemnification Asset	The following is a summary of the activity in the FDIC indemnification asset:
	(Dollars in thousands)
	Balance, December 31, 2014	$	16,762
	Indemnification asset income	77
	Amortization of indemnification asset	(2,516		)
	Cash paid on net recoveries	872
	Balance, March 31, 2015	$	15,195
	Balance, December 31, 2013	$	33,610
	Indemnification asset income	345
	Amortization of indemnification asset	(2,510		)
	Cash received on reimbursable losses	(2,701		)
	Balance, March 31, 2014	$	28,744

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Other Real Estate Owned
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Balance, beginning of period	$	77,626		$	129,396
	Real estate acquired from borrowers	3,098			9,706
	Valuation allowance	(1,390		)	(3,573		)
	Properties sold	(7,881		)	(15,259		)
	Balance, end of period	$	71,453		$	120,270

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances and Short-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2015
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances Owed	The advances as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Mar-15		Maturity Date	Interest Rate as of March 31, 2015
	$	165,000	May 19, 2015	0.36%
	40,000		November 25, 2016	0.21%	(1 Month FRC + 2 bps)*
	540		November 6, 2017	0.50%
	50,000		November 20, 2017	0.22%	(1 Month FRC + 2 bps)*
	50,000		November 23, 2018	0.21%	(1 Month FRC + 2 bps)*
	50,000		December 31, 2019	0.21%	(1 Month FRC + 2 bps)*
	503		February 10, 2026	—%
	$	356,043
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Dec-14		Maturity Date	Interest Rate as of December 31, 2014
	$	105,000	May 19, 2015	0.36%
	40,000		November 25, 2016	0.25%	(1 Month FRC + 2 bps)*
	578		November 6, 2017	0.50%
	50,000		November 20, 2017	0.25%	(1 Month FRC + 2 bps)*
	50,000		November 23, 2018	0.26%	(1 Month FRC + 2 bps)*
	50,000		December 31, 2019	0.21%	(1 Month FRC + 2 bps)*
	513		February 10, 2026	—%
	$	296,091
	(*) FRC =HLB Fixed Rate Credit interest rate.

LongTerm_Borrowings_Tables

Long-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The repurchase agreements as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
	Carrying Amount
	31-Mar-15				31-Dec-14				Contractual Amount				Maturity Date	Contractual Rate
	$	10,469			$	10,540			$	10,000			November 6, 2016	4.75%
	10,520				10,582				10,000				March 30, 2017	4.50%
	10,362				10,394				10,000				December 18, 2017	3.79%
	10,342				10,372				10,000				December 18, 2017	3.72%
	10,602				10,638				10,000				March 22, 2019	3.56%
	$	52,295			$	52,526			$	50,000
Summary of Subordinated Debentures	The subordinated debentures as of March 31, 2015 and December 31, 2014 consisted of the following:
	(Dollars in thousands)
							Carrying Amount
	Date of Offering		Face Amount				31-Mar-15				31-Dec-14			Interest Rate as of March 31, 2015			Maturity Date
	July 31, 2001		$	5,000			$	3,915			$	3,900		3.83	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	July 31, 2001		4,000				2,715				2,699			3.83	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	June 26, 2003		10,000				6,041				6,017			3.37	%	(3 Month LIBOR + 310 bps)	June 26, 2033
	September 25, 2003		10,000				6,553				6,516			3.1	%	(3 Month LIBOR + 285 bps)	October 8, 2033
	December 30, 2003		10,000				5,827				5,802			3.1	%	(3 Month LIBOR + 285 bps)	December 30, 2033
	June 28, 2005		3,000				1,607				1,594			1.95	%	(3 Month LIBOR + 168 bps)	June 28, 2035
	December 22, 2005		10,000				4,637				4,607			1.67	%	(3 Month LIBOR + 140 bps)	March 15, 2036
	December 28, 2005		13,000				6,721				6,668			1.81	%	(3 Month LIBOR + 154 bps)	March 15, 2036
	June 23, 2006		20,000				11,562				11,488			1.8	%	(3 Month LIBOR + 155 bps)	July 7, 2036
	May 16, 2007		56,000				29,121				28,904			1.92	%	(3 Month LIBOR + 165 bps)	June 15, 2037
	June 15, 2007		10,000				5,452				5,426			1.69	%	(3 Month LIBOR + 143 bps)	September 6, 2037
			$	151,000			$	84,151			$	83,621
Schedule of Maturities of Long -Term Borrowings	At March 31, 2015, the maturities of long-term borrowings were as follows:
	(Dollars in thousands)		Fixed Rate				Floating Rate				Total
	Due in 2015		$	—			$	—			$	—
	Due in 2016		10,469				—				10,469
	Due in 2017		31,224				—				31,224
	Due in 2018		—				—				—
	Due in 2019		10,602				—				10,602
	Thereafter		3,529				84,151				87,680
	Total		$	55,824			$	84,151			$	139,975

Shareholders_Equity_and_Minimu1

Shareholders' Equity and Minimum Regulatory Capital Requirements (Tables)	3 Months Ended
	Mar. 31, 2015
Regulatory Capital Requirements [Abstract]
Schedule of Minimum and Actual Ratios	These minimum ratios along with the actual ratios for the Company and the Bank are presented in the following tables:
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	March 31, 2015	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Leverage Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$267,376	≥ 4.0%	$	963,616	14.40%
	Capital Bank, N.A.	$332,757	≥ 5.0%	$266,206	≥ 4.0%	$	724,780	10.90%
	Tier 1 Common Equity Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$251,277	≥ 4.5%	$	893,491	16.00%
	Capital Bank, N.A.	$361,237	≥ 6.5%	$250,087	≥ 4.5%	$	724,780	13.00%
	Tier 1 Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$335,036	≥ 6.0%	$	963,616	17.30%
	Capital Bank, N.A.	$444,599	≥ 8.0%	$333,449	≥ 6.0%	$	724,780	13.00%
	Total Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$446,715	≥ 8.0%	$	1,015,826	18.20%
	Capital Bank, N.A.	$555,749	≥ 10.0%	$444,599	≥ 8.0%	$	776,855	14.00%
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	31-Dec-14	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$261,445	≥ 4.0%	$	933,335	14.30%
	Capital Bank, N.A.	$326,050	≥ 5.0%	$260,840	≥ 4.0%	$	881,395	13.50%
	Tier 1 Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$207,370	≥ 4.0%	$	933,335	18.00%
	Capital Bank, N.A.	$310,245	≥ 6.0%	$206,830	≥ 4.0%	$	881,395	17.00%
	Total Capital
	(to Risk-weighted Assets)
	CBF Consolidated	N/A	N/A	$414,740	≥ 8.0%	$	987,535	19.10%
	Capital Bank, N.A.	$517,074	≥ 10.0%	$413,660	≥ 8.0%	$	935,455	18.10%

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Components and Classification of Stock-Based Compensation Expense	The following table summarizes the components and classification of stock-based compensation expense for the three months ended March 31, 2015 and 2014:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Stock options	$	184		$	195
	Restricted stock	100			533
	Total stock-based compensation expense	$	284		$	728
Summary of Stock Option Activity	A summary of the stock option activity for the three months ended March 31, 2015 and 2014 is as follows:
		Three Months Ended
		March 31, 2015						March 31, 2014
	(Shares in thousands)	Shares		Weighted				Shares			Weighted
				Average							Average
				Exercise Price Per Share							Exercise Price
											Per Share
	Balance, January 1,	3,111		$	20.26			3,124			$	20.5
	Granted	—		—				—			—
	Exercised	—		—				—			—
	Canceled, expired or forfeited	(1	)	589.41				(2	)		301.94
	Balance, March 31,	3,110		$	20.19			3,122			$	20.4
Summary of Options Outstanding	Options outstanding at March 31, 2015 were as follows:
	(Shares in thousands)	Outstanding Options								Exercisable Options
	Range of Exercise Prices	Shares		Weighted		Weighted				Shares			Weighted
				Average		Average							Average
				Remaining		Exercise Price							Exercise Price
				Contractual		Per							Per
				Life		Share							Share
	$18.00	236		8.14 years		$	18			122			$	18
	$20.00	2,864		5.18 years		20				2,864			20
	$28.44 - $2,026.00	10		3.09 years		122.48				10			122.48
	$18.00 - $2,026.00	3,110		5.40 years		$	20.19			2,996			$	20.27
Summary of Unvested Restricted Stock Activity	The following table summarizes unvested restricted stock activity for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31, 2015						March 31, 2014
	(Shares in thousands)	Shares		Weighted				Shares			Weighted
				Average							Average
				Grant-Date							Grant-Date
				Fair Value							Fair Value
				Per Share							Per Share
	Balance, January 1,	810		$	13.89			1,215			$	14.28
	Granted	—		—				—			—
	Vested or released	—		—				—			—
	Canceled, expired or forfeited	—		—				—			—
	Balance, March 31,	810		$	13.89			1,215			$	14.28

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Reconciliation of Income Tax Computed at Applicable Federal Statutory Income Tax Rates to Total Income Taxes	A reconciliation of income tax computed at applicable Federal statutory income tax rates to total income tax expense reported for the three months ended March 31, 2015 and 2014 is as follows:
	(Dollars in thousands)	Three Months Ended
		31-Mar-15			31-Mar-14
	Income before income taxes	$	17,843		$	18,622
	Income taxes computed at Federal statutory tax rate	6,245			6,518
	Effect of:
	State taxes (net of federal benefit)	452			709
	Tax-exempt interest income, net	(489		)	(175		)
	Contingent value right expense (CVR)	—			268
	Other, net	246			(112		)
	Total income tax expense	$	6,454		$	7,208

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	Assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 are summarized below:
	(Dollars in thousands)					Fair Value Measurement Using:
		Total				Quoted Prices			Significant		Significant
						in Active			Other		Unobservable
						Markets for			Observable		Inputs
						Identical Assets			Inputs		(Level 3)
						(Level 1)			(Level 2)
	Assets
	Trading securities	$	2,853			$	—		$	2,853	$	—
	Available-for-sale securities:
	Mortgage-backed securities—residential	549,572				—			549,572		—
	Industrial revenue bonds	3,537				—			—		3,537
	Corporate bonds	22,484				—			22,484		—
	Available-for-sale securities	$	575,593			$	—		$	572,056	$	3,537
	Gross asset value of derivatives	$	703			$	—		$	703	$	—
	Liabilities
	Gross liability value of derivatives	$	73			$	—		$	73	$	—
	There were no transfers of assets and liabilities between levels of the fair value hierarchy during the three months ended March 31, 2015.
	Assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 are summarized below:
	(Dollars in thousands)					Fair Value Measurement Using:
		Total				Quoted Prices			Significant		Significant
						in Active			Other		Unobservable
						Markets for			Observable		Inputs
						Identical Assets			Inputs		(Level 3)
						(Level 1)			(Level 2)
	Assets
	Trading securities	$	2,410			$	—		$	2,410	$	—
	Available-for-sale securities:
	Mortgage-backed securities-residential	552,203				—			552,203		—
	Industrial revenue bonds	3,690				—			—		3,690
	Available-for-sale securities	$	555,893			$	—		$	552,203	$	3,690
	Gross asset value of derivatives	$	4			$	—		$	4	$	—
	Liabilities
	Gross liability value of derivatives	$	26			$	—		$	26	$	—
Fair Value Measurements on Recurring Basis Using Significant Unobservable Inputs (Level 3)	The table below presents the activity and income statement classifications of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended and held at March 31, 2015:
	(Dollars in thousands)		Fair Value Measurement Using Significant
			Unobservable Inputs (Level 3)
			Industrial
			Revenue
			Bonds
	Beginning balance, January 1, 2015		$	3,690
	Principal reduction		(170		)
	Included in other comprehensive income		17
	Ending balance, March 31, 2015		$	3,537
	The table below presents the activity and income statement classifications of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended and held at March 31, 2014:
	(Dollars in thousands)		Fair Value Measurement Using Significant
			Unobservable Inputs (Level 3)
			Industrial
			Revenue
			Bonds
	Beginning balance, January 1, 2014		$	3,859
	Principal reduction		(170		)
	Included in other comprehensive income		38
	Ending balance, March 31, 2014		$	3,727
Quantitative Information About Recurring Level 3 Fair Value Measurements
	(Dollars in thousands)	Fair Value at				Valuation Technique		Significant	Range
		March 31, 2015						Unobservable
								Input
	Industrial revenue bonds	$	3,537			Discounted cash flow		Discount rate	3.06% - 3.09%
								Illiquidity factor	0.50%
	(Dollars in thousands)	Fair Value at				Valuation Technique		Significant	Range
		December 31, 2014						Unobservable
								Input
	Industrial revenue bonds	$	3,690			Discounted cash flow		Discount rate	3.5% - 3.6%
								Illiquidity factor	0.50%
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis	Assets and liabilities measured at fair value on a nonrecurring basis as of March 31, 2015 are summarized below:
	(Dollars in thousands)	Fair Value Measurement Using:
		Quoted Prices in				Significant			Significant
		Active Markets				Other			Unobservable
		for Identical				Observable			Inputs
		Assets				Inputs			(Level 3)
		(Level 1)				(Level 2)
	Assets
	Other real estate owned	$	—			$	—		$	54,862
	Other repossessed assets	—				301			—
	Impaired loans	—				—			625
	Other real estate owned measured at fair value as of March 31, 2015 had a carrying amount of $73.2 million, less valuation allowances totaling $18.4 million. Other repossessed assets are primarily comprised of repossessed vehicles and equipment and are measured at fair value as of the date of repossession.
	Assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2014 are summarized below:
	(Dollars in thousands)	Fair Value Measurement Using:
		Quoted Prices in				Significant			Significant
		Active Markets				Other			Unobservable
		for Identical				Observable			Inputs
		Assets				Inputs			(Level 3)
		(Level 1)				(Level 2)
	Assets
	Other real estate owned	$	—			$	—		$	66,048
	Other repossessed assets	—				150			—
	Impaired loans	—				—			754
Quantitative Information About Nonrecurring Level 3 Fair Value Measurements
	(Dollars in thousands)	Fair Value at				Valuation Technique		Significant Unobservable Input	Weighted Average
		March 31, 2015
	Other real estate owned	$	54,862			Fair value of property		Appraised value less cost to sell	7.85%
	Impaired loans	625				Fair value of collateral		Appraised value less cost to sell	7.70%
	(Dollars in thousands)	Fair Value at				Valuation Technique		Significant Unobservable Input	Weighted Average
		December 31, 2014
	Other real estate owned	$	66,048			Fair value of property		Appraised value less cost to sell	7.86%
	Impaired loans	754				Fair value of collateral		Appraised value less cost to sell	7.60%
Carrying Amounts and Estimated Fair Values of Financial Instruments	Carrying amount and estimated fair values of financial instruments were as follows:
	(Dollars in thousands)	Fair Value Measurement
	March 31, 2015	Carrying Value				Estimated			Level 1		Level 2		Level 3
						Fair Value
	Financial Assets
	Cash and cash equivalents	$	239,981			$	239,981		$	239,981	$	—	$	—
	Trading securities	2,853				2,853			—		2,853		—
	Investment securities available-for-sale	575,593				575,593			—		572,056		3,537
	Investment securities held-to-maturity	448,962				457,939			—		457,939		—
	Loans, net	5,029,784				5,144,700			—		12,403		5,132,297
	FDIC indemnification asset	15,195				15,195			—		—		15,195
	Receivable from FDIC	3,172				3,172			—		3,172		—
	Other earning assets (1)	52,941				52,941			—		—		52,941
	Gross asset value of derivatives	703				703			—		703		—
	Total financial assets	$	6,369,184			$	6,493,077		$	239,981	$	1,049,126	$	5,203,970
	Financial Liabilities
	Non-contractual deposits	$	3,935,435			$	3,935,435		$	—	$	—	$	3,935,435
	Contractual deposits	1,428,121				1,426,066			—		—		1,426,066
	Federal Home Loan Bank advances	356,043				353,002			—		353,002		—
	Short-term borrowings	27,605				27,605			—		27,605		—
	Long-term borrowings	52,295				54,148			—		—		54,148
	Subordinated debentures	87,680				91,487			—		—		91,487
	Gross liability value of derivatives	73				73			—		73		—
	Total financial liabilities	$	5,887,252			$	5,887,816		$	—	$	380,680	$	5,507,136
	(Dollars in thousands)	Fair Value Measurement
	December 31, 2014	Carrying Value				Estimated			Level 1		Level 2		Level 3
						Fair Value
	Financial Assets
	Cash and cash equivalents	$	188,135			$	188,135		$	188,135	$	—	$	—
	Trading securities	2,410				2,410			—		2,410		—
	Investment securities available-for-sale	555,893				555,893			—		552,203		3,690
	Investment securities held-to-maturity	436,962				443,379			—		443,379		—
	Loans, net	4,950,008				5,058,352			—		5,516		5,052,836
	FDIC indemnification asset	16,762				16,762			—		—		16,762
	Receivable from FDIC	3,661				3,661			—		3,661		—
	Other earning assets (1)	50,943				50,943			—		—		50,943
	Gross asset value of derivatives	4				4			—		4		—
	Total financial assets	$	6,204,778			$	6,319,539		$	188,135	$	1,007,173	$	5,124,231
	Financial Liabilities
	Non-contractual deposits	$	3,836,400			$	3,836,400		$	—	$	—	$	3,836,400
	Contractual deposits	1,418,700				1,415,122			—		—		1,415,122
	Federal Home Loan Bank advances	296,091				296,038			—		296,038		—
	Short-term borrowings	23,407				23,407			—		23,407		—
	Long-term borrowings	52,526				54,235			—		—		54,235
	Subordinated debentures	87,155				97,913			—		—		97,913
	Gross liability value of derivatives	26				26			—		26		—
	Total financial liabilities	$	5,714,305			$	5,723,141		$	—	$	319,471	$	5,403,670
	(1) Includes Federal Reserve Bank, Federal Home Loan Bank and Bankers Bank stocks.

Derivative_and_Hedging_Activit1

Derivative and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Instrument Contracts at Fair Value and Balance Sheet Classification	The Company’s derivative instrument contracts at fair value as well as their classification on the Company's balance sheet is presented below:
	(Dollars in thousands)				31-Mar-15						December 31, 2014
		Number of instruments		Balance Sheet Location	Fair Value			Notional			Fair Value				Notional
								Amount							Amount
	Asset derivatives
	Derivatives designated as hedging instruments
	Interest rate swap	1		Other assets	$	695		$	70,000		$	—			$	—
	Derivatives not designated as hedging instruments
	Forward loan sales contracts	9		Other assets	8			2,454			4				1,640
	Total asset derivatives				$	703		$	72,454		$	4			$	1,640
	Liability derivatives
	Derivatives designated as hedging instruments
	Interest rate swap	—		Other liabilities	$	—		$	—		$	—			$	—
	Derivatives not designated as hedging instruments
	Forward loan sales contracts	75		Other liabilities	73			15,478			26				7,578
	Total liability derivatives				$	73		$	15,478		$	26			$	7,578
Summary of Derivative Instrument on the Consolidated Statements of Income	The table below present the effect off the Company's derivative financial instruments on the Consolidated Statements of Income for the three months ended March 31, 2015:
	(Dollars in thousands)
	Derivatives in Cash Flow Hedging Relationship		Amount of Gain Recognized in Accumulated OCI on Derivative (Effective Portion)				Location of Gain Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain Reclassified from Accumulated OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)		Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
	Interest rate swap		$	803			Interest income	$	108		N/A		$	—
Offsetting Derivative Assets	The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company's derivatives as of March 31, 2015:
												Gross Amounts Not Offset in the Balance Sheets
	(Dollars in thousands)	Gross Amount of Recognized Assets				Gross Amount Offset in the Balance Sheets			Net Amount of Assets Presented in the Balance Sheets			Financial Instruments				Cash Collateral Received		Net Amount
	Offsetting of derivative assets:
	Interest rate swap	$	695			$	—		$	695		$	—			$	560	$	135
	Total	$	695			$	—		$	695		$	—			$	560	$	135
	Offsetting of derivative liabilities:
	Interest rate swap	$	—			$	—		$	—		$	—			$	—	$	—
	Total	$	—			$	—		$	—		$	—			$	—	$	—
Offsetting Derivative Liabilities	The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company's derivatives as of March 31, 2015:
												Gross Amounts Not Offset in the Balance Sheets
	(Dollars in thousands)	Gross Amount of Recognized Assets				Gross Amount Offset in the Balance Sheets			Net Amount of Assets Presented in the Balance Sheets			Financial Instruments				Cash Collateral Received		Net Amount
	Offsetting of derivative assets:
	Interest rate swap	$	695			$	—		$	695		$	—			$	560	$	135
	Total	$	695			$	—		$	695		$	—			$	560	$	135
	Offsetting of derivative liabilities:
	Interest rate swap	$	—			$	—		$	—		$	—			$	—	$	—
	Total	$	—			$	—		$	—		$	—			$	—	$	—

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
	depository_institution
	office
Accounting Policies [Abstract]
Amount raised through private placements and an initial public offering during year of inception	$955,600,000
Number of depository institutions acquired since inception	7
Total number of full service banking offices	162
Decrease in deferred tax assets	($121,083,000)	($129,624,000)

Earnings_Per_Common_Share_Comp

Earnings Per Common Share - Computation of Earnings Per Share (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Weighted average number of shares outstanding:
Basic (in shares)	46,294	50,518
Diluted (in shares)	47,632	51,932
Stock options
Weighted average number of shares outstanding:
Dilutive effect (in shares)	676	970
Unvested Restricted Shares
Weighted average number of shares outstanding:
Dilutive effect (in shares)	662	444

Earnings_Per_Common_Share_Weig

Earnings Per Common Share - Weighted Average Anti-Dilutive Stock Options and Unvested Restricted Shares Excluded from the Computation of Diluted Earnings Per Share (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive (in shares)	10	15
Unvested Restricted Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive (in shares)	0	0

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Available-for-Sale
Available-for-sale, Amortized Cost	$568,621	$554,488
Unrealized Gains	7,556	3,237
Unrealized Losses	584	1,832
Available-for-sale securities	575,593	555,893
Held-to-Maturity
Held-to-maturity, Amortized Cost	448,962	436,962
Unrealized Gains	9,049	6,476
Unrealized Losses	72	59
Fair value of investment securities held-to-maturity	457,939	443,379
U.S. Government agencies
Held-to-Maturity
Held-to-maturity, Amortized Cost	13,709	13,989
Unrealized Gains	295	230
Unrealized Losses	0	0
Fair value of investment securities held-to-maturity	14,004	14,219
Corporate bonds
Available-for-Sale
Available-for-sale, Amortized Cost	22,588
Unrealized Gains	13
Unrealized Losses	117
Available-for-sale securities	22,484
Held-to-Maturity
Held-to-maturity, Amortized Cost	30,071	25,000
Unrealized Gains	294	163
Unrealized Losses	23	0
Fair value of investment securities held-to-maturity	30,342	25,163
Mortgage-backed securities—residential issued by government sponsored entities
Available-for-Sale
Available-for-sale, Amortized Cost	542,624	550,908
Unrealized Gains	7,415	3,127
Unrealized Losses	467	1,832
Available-for-sale securities	549,572	552,203
Held-to-Maturity
Held-to-maturity, Amortized Cost	392,725	384,428
Unrealized Gains	7,907	5,626
Unrealized Losses	41	56
Fair value of investment securities held-to-maturity	400,591	389,998
Industrial revenue bonds
Available-for-Sale
Available-for-sale, Amortized Cost	3,409	3,580
Unrealized Gains	128	110
Unrealized Losses	0	0
Available-for-sale securities	3,537	3,690
State and political subdivisions—tax exempt
Held-to-Maturity
Held-to-maturity, Amortized Cost	11,922	13,008
Unrealized Gains	524	431
Unrealized Losses	8	3
Fair value of investment securities held-to-maturity	12,438	13,436
State and political subdivisions—taxable
Held-to-Maturity
Held-to-maturity, Amortized Cost	535	537
Unrealized Gains	29	26
Unrealized Losses	0	0
Fair value of investment securities held-to-maturity	$564	$563

Investment_Securities_Estimate

Investment Securities - Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity by Contractual Maturity (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Amortized Cost
Available-for-sale, Amortized Cost	$568,621	$554,488
Estimated Fair Value
Available-for-sale, Estimated Fair Value	575,593	555,893
Yield
Available-for-sale, Total, Yield	1.94%
Amortized Cost
Held-to-maturity, Amortized Cost	448,962	436,962
Estimated Fair Value
Held-to-maturity, Estimated Fair Value	457,939	443,379
Yield
Held-to-maturity, Total, Yield	2.62%
Debt Securities
Amortized Cost
Available-for-sale, Amortized Cost, Due in one year or less	0
Available-for-sale, Amortized Cost, Due after one year through five years	0
Available-for-sale, Amortized Cost, Due after five years through ten years	0
Available-for-sale, Amortized Cost, Due after ten years	25,997
Estimated Fair Value
Available-for-sale, Estimated Fair Value, Due in one year or less	0
Available-for-sale, Estimated Fair Value, Due after one year through five years	0
Available-for-sale, Estimated Fair Value, Due after five years through ten years	0
Available-for-sale, Estimated Fair Value, Due after ten years	26,021
Yield
Available-for-sale, Due in one year or less, Yield	0.00%
Available-for-sale, Due after one year through five years, Yield	0.00%
Available-for-sale, Due after five years through ten years, Yield	0.00%
Available-for-sale, Due after ten years, Yield	2.42%
Amortized Cost
Held-to-maturity, Amortized Cost, Due in one year or less	203
Held-to-maturity, Amortized Cost, Due after one year through five years	16,267
Held-to-maturity, Amortized Cost, Due after five years through ten years	25,523
Held-to-maturity, Amortized Cost, Due after ten years	14,244
Estimated Fair Value
Held-to-maturity, Estimated Fair Value, Due in one year or less	203
Held-to-maturity, Estimated Fair Value, Due after one year through five years	16,368
Held-to-maturity, Estimated Fair Value, Due after five years through ten years	26,210
Held-to-maturity, Estimated Fair Value, Due after ten years	14,567
Yield
Held-to-maturity, Due in one year or less, Yield	0.77%
Held-to-maturity, Due after one year through five years, Yield	4.59%
Held-to-maturity, Due after five years through ten years, Yield	4.53%
Held-to-maturity, Due after ten years, Yield	2.88%
Mortgage-backed securities—residential issued by government sponsored entities
Amortized Cost
Available-for-sale, Amortized Cost, Mortgage-backed securities—residential issued by government sponsored entities	542,624
Available-for-sale, Amortized Cost	542,624	550,908
Estimated Fair Value
Available-for-sale, Estimated Fair Value, Mortgage-backed securities—residential issued by government sponsored entities	549,572
Available-for-sale, Estimated Fair Value	549,572	552,203
Yield
Available-for-sale, Mortgage-backed securities—residential issued by government sponsored entities, Yield	1.92%
Amortized Cost
Held-to-maturity, Amortized Cost, Mortgage-backed securities—residential issued by government sponsored entities	392,725
Held-to-maturity, Amortized Cost	392,725	384,428
Estimated Fair Value
Held-to-maturity, Estimated Fair Value, Mortgage-backed securities—residential issued by government sponsored entities	400,591
Held-to-maturity, Estimated Fair Value	$400,591	$389,998
Yield
Held-to-maturity, Mortgage-backed securities—residential issued by government sponsored entities, Yield	2.40%

Investment_Securities_Securiti

Investment Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Available-for-sale	$77,322	$215,139
Estimated Fair Value, 12 Months or Longer, Available-for-sale	11,248	28,439
Total, Estimated Fair Value, Available-for-sale	88,570	243,578
Unrealized Losses
Unrealized Losses, Less than 12 Months, Available-for-sale	459	1,596
Unrealized Losses,12 Months or Longer, Available-for-sale	125	236
Total, Unrealized Losses, Available-for-sale	584	1,832
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Held-to-maturity	9,493	14,891
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	9,493	14,891
Unrealized Losses
Unrealized Losses, Less than 12 Months, Held-to-maturity	72	59
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	72	59
Corporate bonds
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Available-for-sale	14,109
Estimated Fair Value, 12 Months or Longer, Available-for-sale	0
Total, Estimated Fair Value, Available-for-sale	14,109
Unrealized Losses
Unrealized Losses, Less than 12 Months, Available-for-sale	117
Unrealized Losses,12 Months or Longer, Available-for-sale	0
Total, Unrealized Losses, Available-for-sale	117
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Held-to-maturity	5,048
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0
Total, Estimated Fair Value, Held-to-maturity	5,048
Unrealized Losses
Unrealized Losses, Less than 12 Months, Held-to-maturity	23
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0
Total, Unrealized Losses, Held-to-maturity	23	0
State and political subdivisions—tax exempt
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Held-to-maturity	1,000	896
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	1,000	896
Unrealized Losses
Unrealized Losses, Less than 12 Months, Held-to-maturity	8	3
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	8	3
Mortgage-backed securities—residential issued by government sponsored entities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Available-for-sale	63,213	215,139
Estimated Fair Value, 12 Months or Longer, Available-for-sale	11,248	28,439
Total, Estimated Fair Value, Available-for-sale	74,461	243,578
Unrealized Losses
Unrealized Losses, Less than 12 Months, Available-for-sale	342	1,596
Unrealized Losses,12 Months or Longer, Available-for-sale	125	236
Total, Unrealized Losses, Available-for-sale	467	1,832
Estimated Fair Value
Estimated Fair Value, Less than 12 Months, Held-to-maturity	3,445	13,995
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	3,445	13,995
Unrealized Losses
Unrealized Losses, Less than 12 Months, Held-to-maturity	41	56
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	$41	$56

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	security
Investments, Debt and Equity Securities [Abstract]
Trading securities	$2,853,000		$2,410,000
Proceeds from sale of securities	20,300,000	800,000
Gain on sale of investments	100,000	300,000
Securities in portfolio	135
Securities in portfolio in an unrealized loss position	15
Investment securities, carrying values	$392,000,000	$339,000,000

Loans_Major_Classifications_of

Loans - Major Classifications of Loans (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$5,078,009	$5,000,219
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,159,456	1,157,101
Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	823,763	798,556
Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	180,166	200,755
Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	88,980	89,132
Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	66,547	68,658
Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,166,035	2,122,532
Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,038,493	1,046,736
Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,125,708	1,073,791
Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,834	2,005
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,605,531	1,576,626
Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	928,832	925,698
Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	379,946	378,475
Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	296,753	272,453
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$146,987	$143,960

Loans_Roll_Forward_of_Accretab

Loans - Roll Forward of Accretable Yield (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accretable Yield
Balance at beginning of period	$292,633	$383,775
Accretion of income	-24,840	-33,162
Reclassification from nonaccretable difference	26,517	6,667
Other	-48,201	-10,285
Balance at end of period	246,109	346,995
Nonaccretable Difference
Nonaccretable difference, balance at the end of the period	$207,762	$253,865

Loans_Major_Categories_of_Loan

Loans - Major Categories of Loans (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	$4,889,612	$4,802,572
Covered loans	188,397	197,647
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,112,648	1,107,411
Covered loans	46,808	49,690
Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	793,243	764,778
Covered loans	30,520	33,778
Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	169,356	190,376
Covered loans	10,810	10,379
Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	84,370	84,469
Covered loans	4,610	4,663
Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	65,679	67,788
Covered loans	868	870
Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,112,962	2,067,334
Covered loans	53,073	55,198
Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	992,312	998,909
Covered loans	46,181	47,827
Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,118,816	1,066,420
Covered loans	6,892	7,371
Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,834	2,005
Covered loans	0	0
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,517,841	1,484,711
Covered loans	87,690	91,915
Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	878,890	873,795
Covered loans	49,942	51,903
Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	342,304	338,562
Covered loans	37,642	39,913
Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	296,647	272,354
Covered loans	106	99
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	146,161	143,116
Covered loans	826	844
Non-PCI Loans, New
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,434,991	3,277,077
Covered loans	0	0
Non-PCI Loans, New | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	579,271	545,421
Covered loans	0	0
Non-PCI Loans, New | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	401,128	372,793
Covered loans	0	0
Non-PCI Loans, New | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	67,723	66,817
Covered loans	0	0
Non-PCI Loans, New | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	49,598	47,765
Covered loans	0	0
Non-PCI Loans, New | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	60,822	58,046
Covered loans	0	0
Non-PCI Loans, New | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,769,955	1,706,361
Covered loans	0	0
Non-PCI Loans, New | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	744,802	745,728
Covered loans	0	0
Non-PCI Loans, New | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,023,319	958,628
Covered loans	0	0
Non-PCI Loans, New | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,834	2,005
Covered loans	0	0
Non-PCI Loans, New | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	980,150	925,685
Covered loans	0	0
Non-PCI Loans, New | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	577,772	560,106
Covered loans	0	0
Non-PCI Loans, New | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	114,890	103,644
Covered loans	0	0
Non-PCI Loans, New | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	287,488	261,935
Covered loans	0	0
Non-PCI Loans, New | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	105,615	99,610
Covered loans	0	0
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	312,565	324,694
Covered loans	30,369	32,199
Non-PCI Loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	67,451	71,040
Covered loans	0	0
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	56,303	58,552
Covered loans	0	0
Non-PCI Loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	144	161
Covered loans	0	0
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	11,004	12,327
Covered loans	0	0
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	0
Covered loans	0	0
Non-PCI Loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	46,383	48,686
Covered loans	211	214
Non-PCI Loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	37,107	38,122
Covered loans	0	0
Non-PCI Loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	9,276	10,564
Covered loans	211	214
Non-PCI Loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	0
Covered loans	0	0
Non-PCI Loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	195,168	201,365
Covered loans	30,158	31,985
Non-PCI Loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	41,413	43,921
Covered loans	1,400	1,512
Non-PCI Loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	149,352	152,797
Covered loans	28,758	30,473
Non-PCI Loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,403	4,647
Covered loans	0	0
Non-PCI Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,563	3,603
Covered loans	0	0
Purchased Credit- Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,142,056	1,200,801
Covered loans	158,028	165,448
Purchased Credit- Impaired | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	465,926	490,950
Covered loans	46,808	49,690
Purchased Credit- Impaired | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	335,812	333,433
Covered loans	30,520	33,778
Purchased Credit- Impaired | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	101,489	123,398
Covered loans	10,810	10,379
Purchased Credit- Impaired | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	23,768	24,377
Covered loans	4,610	4,663
Purchased Credit- Impaired | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,857	9,742
Covered loans	868	870
Purchased Credit- Impaired | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	296,624	312,287
Covered loans	52,862	54,984
Purchased Credit- Impaired | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	210,403	215,059
Covered loans	46,181	47,827
Purchased Credit- Impaired | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	86,221	97,228
Covered loans	6,681	7,157
Purchased Credit- Impaired | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	0
Covered loans	0	0
Purchased Credit- Impaired | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	342,523	357,661
Covered loans	57,532	59,930
Purchased Credit- Impaired | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	259,705	269,768
Covered loans	48,542	50,391
Purchased Credit- Impaired | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	78,062	82,121
Covered loans	8,884	9,440
Purchased Credit- Impaired | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,756	5,772
Covered loans	106	99
Purchased Credit- Impaired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	36,983	39,903
Covered loans	$826	$844

Loans_Aging_of_the_Recorded_In

Loans - Aging of the Recorded Investment in Past Due Loans, Based on Contractual Terms (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Non-purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$16,515	$14,076
Non-purchased credit impaired loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,280	798
Non-purchased credit impaired loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	648	534
Non-purchased credit impaired loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	526	264
Non-purchased credit impaired loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Non-purchased credit impaired loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	106	0
Non-purchased credit impaired loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,289	5,058
Non-purchased credit impaired loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,609	3,268
Non-purchased credit impaired loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,680	1,790
Non-purchased credit impaired loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Non-purchased credit impaired loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,473	8,180
Non-purchased credit impaired loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,348	1,710
Non-purchased credit impaired loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,515	3,053
Non-purchased credit impaired loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,610	3,417
Non-purchased credit impaired loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	473	40
Non-Covered | Non-purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	10,943	8,906
Non-Covered | Non-purchased credit impaired loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	1,031	767
Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	648	534
Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	383	233
Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Non-Covered | Non-purchased credit impaired loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	5,941	4,178
Non-Covered | Non-purchased credit impaired loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	4,380	2,524
Non-Covered | Non-purchased credit impaired loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	1,561	1,654
Non-Covered | Non-purchased credit impaired loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Non-Covered | Non-purchased credit impaired loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	3,971	3,951
Non-Covered | Non-purchased credit impaired loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	1,628	1,284
Non-Covered | Non-purchased credit impaired loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	1,466	1,758
Non-Covered | Non-purchased credit impaired loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	877	909
Non-Covered | Non-purchased credit impaired loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	10
Covered | Non-purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	539	578
Covered | Non-purchased credit impaired loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	65	66
Covered | Non-purchased credit impaired loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	65	66
Covered | Non-purchased credit impaired loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	474	512
Covered | Non-purchased credit impaired loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	66	69
Covered | Non-purchased credit impaired loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	408	443
Covered | Non-purchased credit impaired loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Covered | Non-purchased credit impaired loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Purchased Credit- Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	121,846	126,395
Purchased Credit- Impaired | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	50,349	48,384
Purchased Credit- Impaired | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	15,805	16,743
Purchased Credit- Impaired | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,257	28,844
Purchased Credit- Impaired | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,563	1,924
Purchased Credit- Impaired | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	724	873
Purchased Credit- Impaired | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	39,010	41,165
Purchased Credit- Impaired | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16,564	17,792
Purchased Credit- Impaired | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	22,446	23,373
Purchased Credit- Impaired | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Purchased Credit- Impaired | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,533	34,131
Purchased Credit- Impaired | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25,210	27,841
Purchased Credit- Impaired | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,018	5,977
Purchased Credit- Impaired | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	305	313
Purchased Credit- Impaired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	954	2,715
Purchased Credit- Impaired | Non-Covered
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	103,223	108,255
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	42,516	42,342
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	13,492	14,943
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	26,263	24,602
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	2,037	1,924
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	724	873
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	36,615	38,304
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	14,454	15,189
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	22,161	23,115
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	23,249	25,012
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	19,160	21,224
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	3,934	3,614
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	155	174
Non-accrual	0	0
Purchased Credit- Impaired | Non-Covered | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	843	2,597
Non-accrual	0	0
Purchased Credit- Impaired | Covered
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	12,642	12,882
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	6,623	5,679
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	1,812	1,636
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	4,811	4,043
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	1,123	1,194
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	1,123	1,131
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	63
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	4,896	6,009
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	3,621	4,682
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	1,248	1,300
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	27	27
Non-accrual	0	0
Purchased Credit- Impaired | Covered | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Non-accrual	0	0
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	4,960	4,367
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	249	31
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	143	31
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	106	0
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	283	814
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	229	744
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	54	70
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	3,955	3,492
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	654	357
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	568	627
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	2,733	2,508
30-89 Days Past Due | Non-Covered | Non-purchased credit impaired loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	473	30
30-89 Days Past Due | Covered | Non-purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	73	225
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	73	225
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	73	225
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Covered | Non-purchased credit impaired loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	5,784	5,122
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	526
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,169	363
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	501	164
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	142	199
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due		0
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,252	1,667
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	976	1,472
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	276	195
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	3,252	2,974
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	2,364	1,820
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	765	1,042
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	123	112
30-89 Days Past Due | Purchased Credit- Impaired | Non-Covered | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	111	118
30-89 Days Past Due | Purchased Credit- Impaired | Covered
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	197	136
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	41	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial real estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial real estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	41	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial real estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial real estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	20	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	11	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	9	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	136	136
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	65	115
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	71	21
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Total consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
30-89 Days Past Due | Purchased Credit- Impaired | Covered | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$0	$0

Loans_Loans_Excluding_Purchase

Loans - Loans, Excluding Purchased Credit-Impaired Loans by Internal Ratings (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Total loans	$5,078,009	$5,000,219
Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,159,456	1,157,101
Total commercial real estate | Non-owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	823,763	798,556
Total commercial real estate | Other commercial construction and land
Financing Receivable, Recorded Investment [Line Items]
Total loans	180,166	200,755
Total commercial real estate | Multifamily commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	88,980	89,132
Total commercial real estate | 1-4 family residential construction and land
Financing Receivable, Recorded Investment [Line Items]
Total loans	66,547	68,658
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,166,035	2,122,532
Total commercial | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,038,493	1,046,736
Total commercial | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,125,708	1,073,791
Total commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,834	2,005
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,605,531	1,576,626
Total consumer | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	928,832	925,698
Total consumer | Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	379,946	378,475
Total consumer | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	296,753	272,453
Other
Financing Receivable, Recorded Investment [Line Items]
Total loans	146,987	143,960
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,777,925	3,633,970
Non-PCI Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,741,460	3,597,274
Non-PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,037	10,619
Non-PCI Loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,946	16,593
Non-PCI Loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,482	9,484
Non-PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	646,722	616,461
Non-PCI Loans | Total commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	640,629	612,436
Non-PCI Loans | Total commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,186	882
Non-PCI Loans | Total commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,876	2,376
Non-PCI Loans | Total commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,031	767
Non-PCI Loans | Total commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	457,431	431,345
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	455,114	429,126
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	21	835
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,648	850
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	648	534
Non-PCI Loans | Total commercial real estate | Non-owner occupied commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Other commercial construction and land
Financing Receivable, Recorded Investment [Line Items]
Total loans	67,867	66,978
Non-PCI Loans | Total commercial real estate | Other commercial construction and land | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	67,408	66,667
Non-PCI Loans | Total commercial real estate | Other commercial construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	46	47
Non-PCI Loans | Total commercial real estate | Other commercial construction and land | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	30	31
Non-PCI Loans | Total commercial real estate | Other commercial construction and land | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	383	233
Non-PCI Loans | Total commercial real estate | Other commercial construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,602	60,092
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,602	60,092
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | Multifamily commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,822	58,046
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,505	56,551
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,119	0
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,198	1,495
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial real estate | 1-4 family residential construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,816,549	1,755,261
Non-PCI Loans | Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,795,654	1,732,100
Non-PCI Loans | Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,057	8,922
Non-PCI Loans | Total commercial | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,831	9,995
Non-PCI Loans | Total commercial | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,007	4,244
Non-PCI Loans | Total commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	781,909	783,850
Non-PCI Loans | Total commercial | Owner occupied commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	767,745	766,822
Non-PCI Loans | Total commercial | Owner occupied commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,225	6,687
Non-PCI Loans | Total commercial | Owner occupied commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,558	7,817
Non-PCI Loans | Total commercial | Owner occupied commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,381	2,524
Non-PCI Loans | Total commercial | Owner occupied commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,032,806	969,406
Non-PCI Loans | Total commercial | Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,026,075	963,273
Non-PCI Loans | Total commercial | Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,832	2,235
Non-PCI Loans | Total commercial | Commercial and industrial loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,273	2,178
Non-PCI Loans | Total commercial | Commercial and industrial loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,626	1,720
Non-PCI Loans | Total commercial | Commercial and industrial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,834	2,005
Non-PCI Loans | Total commercial | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,834	2,005
Non-PCI Loans | Total commercial | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Lease financing | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Lease financing | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total commercial | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,205,476	1,159,035
Non-PCI Loans | Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,196,472	1,150,008
Non-PCI Loans | Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	321	342
Non-PCI Loans | Total consumer | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,239	4,222
Non-PCI Loans | Total consumer | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,444	4,463
Non-PCI Loans | Total consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	620,585	605,539
Non-PCI Loans | Total consumer | 1-4 family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	616,470	601,738
Non-PCI Loans | Total consumer | 1-4 family residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	263	283
Non-PCI Loans | Total consumer | 1-4 family residential | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,158	2,165
Non-PCI Loans | Total consumer | 1-4 family residential | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,694	1,353
Non-PCI Loans | Total consumer | 1-4 family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer | Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	293,000	286,914
Non-PCI Loans | Total consumer | Home equity loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	288,988	282,597
Non-PCI Loans | Total consumer | Home equity loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	58	59
Non-PCI Loans | Total consumer | Home equity loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,081	2,057
Non-PCI Loans | Total consumer | Home equity loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,873	2,201
Non-PCI Loans | Total consumer | Home equity loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	291,891	266,582
Non-PCI Loans | Total consumer | Other consumer loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	291,014	265,673
Non-PCI Loans | Total consumer | Other consumer loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer | Other consumer loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Total consumer | Other consumer loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	877	909
Non-PCI Loans | Total consumer | Other consumer loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Other
Financing Receivable, Recorded Investment [Line Items]
Total loans	109,178	103,213
Non-PCI Loans | Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	108,705	102,730
Non-PCI Loans | Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	473	473
Non-PCI Loans | Other | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non-PCI Loans | Other | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	10
Non-PCI Loans | Other | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	$0	$0

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	0 Months Ended
	Jul. 16, 2010	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$12,403,000	$5,516,000
Deferred loan origination costs		11,000,000	10,100,000
Total loans		5,078,009,000	5,000,219,000
Covered loans		188,397,000	197,647,000
Other Real Estate, Covered		15,000,000		18,600,000
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		12,400,000	5,500,000
Total commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		2,166,035,000	2,122,532,000
Covered loans		53,073,000	55,198,000
Other Real Estate, Covered		14,300,000
Total commercial | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Analysis of loans individually by classification of credit risk		500,000
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		146,987,000	143,960,000
Covered loans		826,000	844,000
Other | Farm Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		44,300,000	41,300,000
Other | State and Political Subdivision Obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		78,000,000	76,900,000
Other | Deposit Customer Overdraft
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,500,000	1,700,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans		103,500,000
Period covered by loss sharing agreement	5 years
Other Covered Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period covered by loss sharing agreement	8 years
Single Family Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans		84,900,000
Other Real Estate, Covered		$700,000
Period covered by loss sharing agreement	10 years

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses - Allowance for Loan and Lease Losses (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$50,211	$56,851
Provision (reversal) for loan and lease losses	-841	-24
Non-PCI loans charged-off	-1,899	-1,956
Recoveries of non-PCI loans previously charged-off	754	735
Balance, end of period	48,225	55,606
Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Provision (reversal) for loan and lease losses	1,085	2,464
Non-PCI loans charged-off	-1,899	-1,956
Recoveries of non-PCI loans previously charged-off	754	735
Purchased Credit- Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	28,856	37,900
Provision (reversal) for loan and lease losses	-1,926	-2,488
Non-PCI loans charged-off	0	0
Recoveries of non-PCI loans previously charged-off	0	0
Balance, end of period	$26,930	$35,412

Allowance_for_Loan_and_Lease_L3

Allowance for Loan and Lease Losses - Roll Forward of Allowance for Loan and Lease Losses (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$50,211	$56,851
Provision/ (Reversals)	-841	-24
Net(Charge-offs)/ Recoveries	-1,145	-1,221
Balance, end of period	48,225	55,606
Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	15,557	14,730
Provision/ (Reversals)	-14	141
Net(Charge-offs)/ Recoveries	165	-188
Balance, end of period	15,708	14,683
Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,006	12,763
Provision/ (Reversals)	-199	-998
Net(Charge-offs)/ Recoveries	-15	-36
Balance, end of period	11,792	11,729
Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	22,388	28,275
Provision/ (Reversals)	-915	751
Net(Charge-offs)/ Recoveries	-1,012	-705
Balance, end of period	20,461	28,321
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	260	1,083
Provision/ (Reversals)	287	82
Net(Charge-offs)/ Recoveries	-283	-292
Balance, end of period	264	873
Non-owner occupied commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,022	4,635
Provision/ (Reversals)	-135	-819
Net(Charge-offs)/ Recoveries	3	13
Balance, end of period	1,890	3,829
Other commercial construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,181	8,217
Provision/ (Reversals)	233	875
Net(Charge-offs)/ Recoveries	161	-200
Balance, end of period	12,575	8,892
Multifamily commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	252	320
Provision/ (Reversals)	-29	83
Net(Charge-offs)/ Recoveries	0	0
Balance, end of period	223	403
1-4 family residential construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,102	1,558
Provision/ (Reversals)	-83	2
Net(Charge-offs)/ Recoveries	1	-1
Balance, end of period	1,020	1,559
Owner occupied commercial real estate | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,504	4,450
Provision/ (Reversals)	183	-807
Net(Charge-offs)/ Recoveries	-112	-113
Balance, end of period	2,575	3,530
Commercial and industrial loans | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	9,502	8,310
Provision/ (Reversals)	-382	-189
Net(Charge-offs)/ Recoveries	97	77
Balance, end of period	9,217	8,198
Lease financing | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	0	3
Provision/ (Reversals)	0	-2
Net(Charge-offs)/ Recoveries	0	0
Balance, end of period	0	1
1-4 family residential | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	15,451	21,724
Provision/ (Reversals)	-1,710	-1,323
Net(Charge-offs)/ Recoveries	-211	-18
Balance, end of period	13,530	20,383
Home equity loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,815	3,869
Provision/ (Reversals)	42	1,054
Net(Charge-offs)/ Recoveries	-68	-48
Balance, end of period	2,789	4,875
Other consumer loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,122	2,682
Provision/ (Reversals)	753	1,020
Net(Charge-offs)/ Recoveries	-733	-639
Balance, end of period	$4,142	$3,063

Allowance_for_Loan_and_Lease_L4

Allowance for Loan and Lease Losses - Rollforward of Allowance for Loan and Lease Losses for PCI and Non-PCI Loans (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$50,211	$56,851
Charge-offs	-1,899	-1,956
Recoveries	754	735
Net charge-offs	-1,145	-1,221
Provision (reversal) for loan and lease losses	-841	-24
Balance, end of period	48,225	55,606
Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	21,355	18,951
Charge-offs	-1,899	-1,956
Recoveries	754	735
Net charge-offs	-1,145	-1,221
Provision (reversal) for loan and lease losses	1,085	2,464
Balance, end of period	21,295	20,194
Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	15,557	14,730
Charge-offs	-8	-211
Recoveries	173	23
Net charge-offs	165	-188
Provision (reversal) for loan and lease losses	-14	141
Balance, end of period	15,708	14,683
Total commercial real estate | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-8	-211
Recoveries	173	23
Provision (reversal) for loan and lease losses	-205	477
Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,006	12,763
Charge-offs	-166	-191
Recoveries	151	155
Net charge-offs	-15	-36
Provision (reversal) for loan and lease losses	-199	-998
Balance, end of period	11,792	11,729
Total commercial | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-166	-191
Recoveries	151	155
Provision (reversal) for loan and lease losses	88	256
Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	22,388	28,275
Charge-offs	-1,242	-957
Recoveries	230	252
Net charge-offs	-1,012	-705
Provision (reversal) for loan and lease losses	-915	751
Balance, end of period	20,461	28,321
Total consumer | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-1,242	-957
Recoveries	230	252
Provision (reversal) for loan and lease losses	909	1,583
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	260	1,083
Charge-offs	-483	-597
Recoveries	200	305
Net charge-offs	-283	-292
Provision (reversal) for loan and lease losses	287	82
Balance, end of period	264	873
Other | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-483	-597
Recoveries	200	305
Provision (reversal) for loan and lease losses	293	148
Non-owner occupied commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,022	4,635
Charge-offs	0	0
Recoveries	3	13
Net charge-offs	3	13
Provision (reversal) for loan and lease losses	-135	-819
Balance, end of period	1,890	3,829
Non-owner occupied commercial real estate | Total commercial real estate | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	3	13
Provision (reversal) for loan and lease losses	32	22
Other commercial construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,181	8,217
Charge-offs	-8	-208
Recoveries	169	8
Net charge-offs	161	-200
Provision (reversal) for loan and lease losses	233	875
Balance, end of period	12,575	8,892
Other commercial construction and land | Total commercial real estate | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-8	-208
Recoveries	169	8
Provision (reversal) for loan and lease losses	-204	500
Multifamily commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	252	320
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Provision (reversal) for loan and lease losses	-29	83
Balance, end of period	223	403
Multifamily commercial real estate | Total commercial real estate | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-4	-11
1-4 family residential construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,102	1,558
Charge-offs	0	-3
Recoveries	1	2
Net charge-offs	1	-1
Provision (reversal) for loan and lease losses	-83	2
Balance, end of period	1,020	1,559
1-4 family residential construction and land | Total commercial real estate | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	-3
Recoveries	1	2
Provision (reversal) for loan and lease losses	-29	-34
Owner occupied commercial real estate | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,504	4,450
Charge-offs	-112	-136
Recoveries	0	23
Net charge-offs	-112	-113
Provision (reversal) for loan and lease losses	183	-807
Balance, end of period	2,575	3,530
Owner occupied commercial real estate | Total commercial | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-112	-136
Recoveries	0	23
Provision (reversal) for loan and lease losses	300	222
Commercial and industrial loans | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	9,502	8,310
Charge-offs	-54	-55
Recoveries	151	132
Net charge-offs	97	77
Provision (reversal) for loan and lease losses	-382	-189
Balance, end of period	9,217	8,198
Commercial and industrial loans | Total commercial | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-54	-55
Recoveries	151	132
Provision (reversal) for loan and lease losses	-213	35
Lease financing | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	0	3
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Provision (reversal) for loan and lease losses	0	-2
Balance, end of period	0	1
Lease financing | Total commercial | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	1	-1
1-4 family residential | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	15,451	21,724
Charge-offs	-215	-21
Recoveries	4	3
Net charge-offs	-211	-18
Provision (reversal) for loan and lease losses	-1,710	-1,323
Balance, end of period	13,530	20,383
1-4 family residential | Total consumer | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-215	-21
Recoveries	4	3
Provision (reversal) for loan and lease losses	107	254
Home equity loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,815	3,869
Charge-offs	-160	-129
Recoveries	92	81
Net charge-offs	-68	-48
Provision (reversal) for loan and lease losses	42	1,054
Balance, end of period	2,789	4,875
Home equity loans | Total consumer | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-160	-129
Recoveries	92	81
Provision (reversal) for loan and lease losses	55	141
Other consumer loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,122	2,682
Charge-offs	-867	-807
Recoveries	134	168
Net charge-offs	-733	-639
Provision (reversal) for loan and lease losses	753	1,020
Balance, end of period	4,142	3,063
Other consumer loans | Total consumer | Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	-867	-807
Recoveries	134	168
Provision (reversal) for loan and lease losses	747	1,188
Purchased Credit- Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	28,856	37,900
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Provision (reversal) for loan and lease losses	-1,926	-2,488
Balance, end of period	26,930	35,412
Purchased Credit- Impaired | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	191	-336
Purchased Credit- Impaired | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-287	-1,254
Purchased Credit- Impaired | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-1,824	-832
Purchased Credit- Impaired | Other
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-6	-66
Purchased Credit- Impaired | Non-owner occupied commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-167	-841
Purchased Credit- Impaired | Other commercial construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	437	375
Purchased Credit- Impaired | Multifamily commercial real estate | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-25	94
Purchased Credit- Impaired | 1-4 family residential construction and land | Total commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-54	36
Purchased Credit- Impaired | Owner occupied commercial real estate | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-117	-1,029
Purchased Credit- Impaired | Commercial and industrial loans | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-169	-224
Purchased Credit- Impaired | Lease financing | Total commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-1	-1
Purchased Credit- Impaired | 1-4 family residential | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-1,817	-1,577
Purchased Credit- Impaired | Home equity loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	-13	913
Purchased Credit- Impaired | Other consumer loans | Total consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0
Recoveries	0	0
Provision (reversal) for loan and lease losses	$6	($168)

Allowance_for_Loan_and_Lease_L5

Allowance for Loan and Lease Losses - Summary of Allowance for Loan and Lease Losses and Recorded Investment in Loans by Class of Loans and by Impairment Evaluation (Detail) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for impairment, unamortized purchase discounts (Premium)	$10,900,000		$11,700,000
Acquired Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Collectively Evaluated for Impairment	341,600,000		355,400,000
Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	337,000		15,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	20,958,000		21,340,000
Loans, Individually Evaluated for Impairment	9,097,000		7,418,000
Loans, Collectively Evaluated for Impairment	3,756,425,000	[1]	3,621,036,000	[2]
Non-PCI Loans | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	3,799,000		3,839,000
Loans, Individually Evaluated for Impairment	464,000		0
Loans, Collectively Evaluated for Impairment	646,258,000	[1]	616,461,000	[2]
Non-PCI Loans | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	302,000		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,642,000		9,871,000
Loans, Individually Evaluated for Impairment	6,855,000		6,127,000
Loans, Collectively Evaluated for Impairment	1,809,694,000	[1]	1,749,134,000	[2]
Non-PCI Loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	35,000		15,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,171,000		7,294,000
Loans, Individually Evaluated for Impairment	1,778,000		1,291,000
Loans, Collectively Evaluated for Impairment	1,191,295,000	[1]	1,152,228,000	[2]
Non-PCI Loans | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment			0
Allowance for Loan Losses, Collectively Evaluated for Impairment	346,000		336,000
Loans, Individually Evaluated for Impairment			0
Loans, Collectively Evaluated for Impairment	109,178,000	[1]	103,213,000	[2]
Non-PCI Loans | Non-owner occupied commercial real estate | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,598,000		1,563,000
Loans, Individually Evaluated for Impairment	464,000		0
Loans, Collectively Evaluated for Impairment	456,967,000	[1]	431,345,000	[2]
Non-PCI Loans | Other commercial construction and land | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,369,000		1,411,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	67,867,000	[1]	66,978,000	[2]
Non-PCI Loans | Multifamily commercial real estate | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	122,000		126,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	60,602,000	[1]	60,092,000	[2]
Non-PCI Loans | 1-4 family residential construction and land | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	710,000		739,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	60,822,000	[1]	58,046,000	[2]
Non-PCI Loans | Owner occupied commercial real estate | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	302,000		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,015,000		2,129,000
Loans, Individually Evaluated for Impairment	4,667,000		3,423,000
Loans, Collectively Evaluated for Impairment	777,242,000	[1]	780,427,000	[2]
Non-PCI Loans | Commercial and industrial loans | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,627,000		7,742,000
Loans, Individually Evaluated for Impairment	2,188,000		2,704,000
Loans, Collectively Evaluated for Impairment	1,030,618,000	[1]	966,702,000	[2]
Non-PCI Loans | Lease financing | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	0		0
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	1,834,000	[1]	2,005,000	[2]
Non-PCI Loans | 1-4 family residential | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	8,000		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,728,000		2,840,000
Loans, Individually Evaluated for Impairment	901,000		745,000
Loans, Collectively Evaluated for Impairment	607,281,000	[1]	599,278,000	[2]
Non-PCI Loans | Home equity loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	18,000		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	608,000		639,000
Loans, Individually Evaluated for Impairment	625,000		325,000
Loans, Collectively Evaluated for Impairment	292,375,000	[1]	286,589,000	[2]
Non-PCI Loans | Other consumer loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	9,000		15,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	3,835,000		3,815,000
Loans, Individually Evaluated for Impairment	252,000		221,000
Loans, Collectively Evaluated for Impairment	291,639,000	[1]	266,361,000	[2]
Purchased Credit- Impaired | Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	26,930,000		28,856,000
Loans, Purchase Credit-Impaired	1,300,084,000		1,366,249,000
Purchased Credit- Impaired | Non-PCI Loans | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	11,909,000		11,718,000
Loans, Purchase Credit-Impaired	512,734,000		540,640,000
Purchased Credit- Impaired | Non-PCI Loans | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	1,848,000		2,135,000
Loans, Purchase Credit-Impaired	349,486,000		367,271,000
Purchased Credit- Impaired | Non-PCI Loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	13,255,000		15,079,000
Loans, Purchase Credit-Impaired	400,055,000		417,591,000
Purchased Credit- Impaired | Non-PCI Loans | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	-82,000		-76,000
Loans, Purchase Credit-Impaired	37,809,000		40,747,000
Purchased Credit- Impaired | Non-PCI Loans | Non-owner occupied commercial real estate | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	292,000		459,000
Loans, Purchase Credit-Impaired	366,332,000		367,211,000
Purchased Credit- Impaired | Non-PCI Loans | Other commercial construction and land | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	11,206,000		10,770,000
Loans, Purchase Credit-Impaired	112,299,000		133,777,000
Purchased Credit- Impaired | Non-PCI Loans | Multifamily commercial real estate | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	101,000		126,000
Loans, Purchase Credit-Impaired	28,378,000		29,040,000
Purchased Credit- Impaired | Non-PCI Loans | 1-4 family residential construction and land | Total commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	310,000		363,000
Loans, Purchase Credit-Impaired	5,725,000		10,612,000
Purchased Credit- Impaired | Non-PCI Loans | Owner occupied commercial real estate | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	258,000		375,000
Loans, Purchase Credit-Impaired	256,584,000		262,886,000
Purchased Credit- Impaired | Non-PCI Loans | Commercial and industrial loans | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	1,590,000		1,760,000
Loans, Purchase Credit-Impaired	92,902,000		104,385,000
Purchased Credit- Impaired | Non-PCI Loans | Lease financing | Total commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	0		0
Loans, Purchase Credit-Impaired	0		0
Purchased Credit- Impaired | Non-PCI Loans | 1-4 family residential | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	10,794,000		12,611,000
Loans, Purchase Credit-Impaired	308,247,000		320,159,000
Purchased Credit- Impaired | Non-PCI Loans | Home equity loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	2,163,000		2,176,000
Loans, Purchase Credit-Impaired	86,946,000		91,561,000
Purchased Credit- Impaired | Non-PCI Loans | Other consumer loans | Total consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Purchased Credit-Impaired	298,000		292,000
Loans, Purchase Credit-Impaired	$4,862,000		$5,871,000
[1]	Loans collectively evaluated for impairment include $341.6 million of acquired loans which are presented net of unamortized purchase discounts of $10.9 million.
[2]	ns collectively evaluated for impairment include $355.4 million of acquired loans which are presented net of unamortized purchase discounts of $11.7 million.Tr

Allowance_for_Loan_and_Lease_L6

Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Receivables [Abstract]
Loans modified in TDRs with recorded investments	$0.50	$0.30

FDIC_Indemnification_Asset_Add

FDIC Indemnification Asset - Additional Information (Detail)	0 Months Ended	3 Months Ended
	Jul. 16, 2010	Mar. 31, 2015
		agreement
FDIC Indemnification Asset [Line Items]
Percentage future credit losses and workout expenses to be absorbed by FDIC		80.00%
Single Family Loans
FDIC Indemnification Asset [Line Items]
Number of FDIC loss sharing agreements		3
Period covered by loss sharing agreement	10 years
Commercial and Other Loans
FDIC Indemnification Asset [Line Items]
Number of FDIC loss sharing agreements		3
Period covered by loss sharing agreement	5 years
Other Covered Assets
FDIC Indemnification Asset [Line Items]
Period covered by loss sharing agreement	8 years

FDIC_Indemnification_Asset_Sch

FDIC Indemnification Asset - Schedule of FDIC Indemnification Asset (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
FDIC Indemnification Asset [Roll Forward]
FDIC indemnification asset, beginning balance	$16,762	$33,610
Indemnification asset income	77	345
Amortization of indemnification asset	-2,516	-2,510
Cash paid on net recoveries (received on reimbursable losses)	872	-2,701
FDIC indemnification asset, ending balance	$15,195	$28,744

Other_Real_Estate_Owned_Additi

Other Real Estate Owned - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Banking and Thrift [Abstract]
Other Real Estate, Covered	$15,000,000	$18,600,000
Non-covered OREO	56,500,000	101,700,000
Proceeds from sales of OREO	7,887,000	15,979,000
Net gain on sales of OREO	$7,000	$721,000

Other_Real_Estate_Owned_Other_

Other Real Estate Owned - Other Real Estate Owned (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Real Estate [Roll Forward]
Balance, beginning of period	$77,626	$129,396
Real estate acquired from borrowers	3,098	9,706
Valuation allowance	-1,390	-3,573
Properties sold	-7,881	-15,259
Balance, end of period	$71,453	$120,270

Federal_Home_Loan_Bank_Advance2

Federal Home Loan Bank Advances and Short-Term Borrowings - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Securities sold under repurchase agreements	$27,000,000	$23,400,000
Amounts of eligible collateral provided for incremental borrowing	204,100,000	247,700,000
Federal Home Loan Bank advances	356,043,000	296,091,000
Letter of Credit
Short-term Debt [Line Items]
Federal Home Loan Bank advances	25,400,000	25,700,000
Letter of credit used as collateral in lieu of pledging securities	$25,200,000

Federal_Home_Loan_Bank_Advance3

Federal Home Loan Bank Advances and Short-Term Borrowings - Federal Home Loan Bank Advance Owed (Detail) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	$356,043		$296,091
FHLB Advances With 0.36%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	165,000		105,000
Interest Rate	0.36%		0.36%
FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	40,000	[1]
Interest Rate	0.21%	[1]
FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount			40,000	[1]
Interest Rate			0.25%	[1]
FHLB Advances With 0.50%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	540		578
Interest Rate	0.50%		0.50%
FHLB Advances With 0.22%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]
Interest Rate	0.22%	[1]
FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount			50,000	[1]
Interest Rate			0.25%	[1]
FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]
Interest Rate	0.21%	[1]
FHLB Advances With 0.26%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount			50,000	[1]
Interest Rate			0.26%	[1]
FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]	50,000	[1]
Interest Rate	0.21%	[1]	0.21%	[1]
FHLB Advances With 0.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	$503		$513
Interest Rate	0.00%		0.00%
1 Month FRC | FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points	0.02%	[1]
1 Month FRC | FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points			0.02%	[1]
1 Month FRC | FHLB Advances With 0.22%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points	0.02%	[1]
1 Month FRC | FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points			0.02%	[1]
1 Month FRC | FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points	0.02%	[1]
1 Month FRC | FHLB Advances With 0.26%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points			0.02%	[1]
1 Month FRC | FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest Rate, Basis Points	0.02%	[1]	0.02%	[1]
[1]	FRC =HLB Fixed Rate Credit interest rate.

LongTerm_Borrowings_Schedule_o

Long-Term Borrowings - Schedule of Repurchase Agreements (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	$139,975,000	$139,681,000
Repurchase Agreement
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	52,295,000	52,526,000
Contractual Amount	50,000,000
Repurchase Agreement | 4.75%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,469,000	10,540,000
Contractual Amount	10,000,000
Contractual Rate	4.75%
Repurchase Agreement | 4.50%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,520,000	10,582,000
Contractual Amount	10,000,000
Contractual Rate	4.50%
Repurchase Agreement | 3.79%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,362,000	10,394,000
Contractual Amount	10,000,000
Contractual Rate	3.79%
Repurchase Agreement | 3.72%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,342,000	10,372,000
Contractual Amount	10,000,000
Contractual Rate	3.72%
Repurchase Agreement | 3.56%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,602,000	10,638,000
Contractual Amount	$10,000,000
Contractual Rate	3.56%

LongTerm_Borrowings_Additional

Long-Term Borrowings - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Period allowed for deferral of interest payment on the trust preferred securities (up to)	60 months
Carrying amount	$139,975,000	$139,681,000
Collateralized Mortgage-Backed Securities
Debt Instrument [Line Items]
Collateralized mortgage-backed securities	59,800,000	61,400,000
Repurchase Agreement
Debt Instrument [Line Items]
Weighted-average rate of repurchase agreements	4.06%	4.06%
Carrying amount	52,295,000	52,526,000
Subordinated Debt
Debt Instrument [Line Items]
Carrying amount	84,151,000	83,621,000
Subordinated Debt | 10% Subordinated Promissory Note
Debt Instrument [Line Items]
Carrying amount	3,500,000	3,500,000
Debt Securities
Debt Instrument [Line Items]
Life of debt securities and trust preferred securities	30 years
Trust Preferred Securities
Debt Instrument [Line Items]
Number of trust preferred securities acquired	13
Life of debt securities and trust preferred securities	30 years
CBKN | Subordinated Debt | 10% Subordinated Promissory Note
Debt Instrument [Line Items]
Contractual Rate	10.00%
Maturity Date	18-Mar-20
Carrying amount	$3,400,000

LongTerm_Borrowings_Summary_of

Long-Term Borrowings - Summary of Subordinated Debentures (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying Amount	$139,975,000	$139,681,000
3 Month LIBOR | 3.83% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	3.58%
3 Month LIBOR | 3.83% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	3.58%
3 Month LIBOR | 3.37% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	3.10%
3 Month LIBOR | 3.10% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	2.85%
3 Month LIBOR | 3.10% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	2.85%
3 Month LIBOR | 1.95% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.68%
3 Month LIBOR | 1.67% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.40%
3 Month LIBOR | 1.81% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.54%
3 Month LIBOR | 1.80% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.55%
3 Month LIBOR | 1.92% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.65%
3 Month LIBOR | 1.69% Subordinated Debentures
Debt Instrument [Line Items]
Interest Rate, Basis Points	1.43%
Subordinated Debt
Debt Instrument [Line Items]
Face Amount	151,000,000
Carrying Amount	84,151,000	83,621,000
Subordinated Debt | 3.83% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	31-Jul-01
Face Amount	5,000,000
Carrying Amount	3,915,000	3,900,000
Interest Rate	3.83%
Maturity Date	31-Jul-31
Subordinated Debt | 3.83% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	31-Jul-01
Face Amount	4,000,000
Carrying Amount	2,715,000	2,699,000
Interest Rate	3.83%
Maturity Date	31-Jul-31
Subordinated Debt | 3.37% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	26-Jun-03
Face Amount	10,000,000
Carrying Amount	6,041,000	6,017,000
Interest Rate	3.37%
Maturity Date	26-Jun-33
Subordinated Debt | 3.10% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	25-Sep-03
Face Amount	10,000,000
Carrying Amount	6,553,000	6,516,000
Interest Rate	3.10%
Maturity Date	8-Oct-33
Subordinated Debt | 3.10% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	30-Dec-03
Face Amount	10,000,000
Carrying Amount	5,827,000	5,802,000
Interest Rate	3.10%
Maturity Date	30-Dec-33
Subordinated Debt | 1.95% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	28-Jun-05
Face Amount	3,000,000
Carrying Amount	1,607,000	1,594,000
Interest Rate	1.95%
Maturity Date	28-Jun-35
Subordinated Debt | 1.67% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	22-Dec-05
Face Amount	10,000,000
Carrying Amount	4,637,000	4,607,000
Interest Rate	1.67%
Maturity Date	15-Mar-36
Subordinated Debt | 1.81% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	28-Dec-05
Face Amount	13,000,000
Carrying Amount	6,721,000	6,668,000
Interest Rate	1.81%
Maturity Date	15-Mar-36
Subordinated Debt | 1.80% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	23-Jun-06
Face Amount	20,000,000
Carrying Amount	11,562,000	11,488,000
Interest Rate	1.80%
Maturity Date	7-Jul-36
Subordinated Debt | 1.92% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	16-May-07
Face Amount	56,000,000
Carrying Amount	29,121,000	28,904,000
Interest Rate	1.92%
Maturity Date	15-Jun-37
Subordinated Debt | 1.69% Subordinated Debentures
Debt Instrument [Line Items]
Date of Offering	15-Jun-07
Face Amount	10,000,000
Carrying Amount	$5,452,000	$5,426,000
Interest Rate	1.69%
Maturity Date	6-Sep-37

LongTerm_Borrowings_Schedule_o1

Long-Term Borrowings - Schedule of Maturities of Long -Term Borrowings (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Due in 2015	$0
Due in 2016	10,469
Due in 2017	31,224
Due in 2018	0
Due in 2019	10,602
Thereafter	87,680
Total	139,975	139,681
Fixed Rate
Debt Instrument [Line Items]
Due in 2015	0
Due in 2016	10,469
Due in 2017	31,224
Due in 2018	0
Due in 2019	10,602
Thereafter	3,529
Total	55,824
Floating Rate
Debt Instrument [Line Items]
Due in 2015	0
Due in 2016	0
Due in 2017	0
Due in 2018	0
Due in 2019	0
Thereafter	84,151
Total	$84,151

Shareholders_Equity_and_Minimu2

Shareholders' Equity and Minimum Regulatory Capital Requirements - Schedule of Minimum and Actual Ratios (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
CBF Consolidated
Tier 1 Leverage Capital
Adequately capitalized requirement tier 1 capital to average assets, amount	$267,376	$261,445
Actual tier 1 capital to average assets	963,616	933,335
Tier 1 Common Equity Capital
Adequately capitalized requirement tier 1 common equity capital to risk weighted assets, amount	251,277
Actual tier 1 common equity capital to risk weighted average assets, amount	893,491
Tier 1 Capital
Adequately capitalized requirement tier 1 capital to risk weighted assets, amount	335,036	207,370
Actual tier 1 capital to risk weighted assets, amount	963,616	933,335
Total Capital
Adequately capitalized requirement total capital to risk weighted assets, amount	446,715	414,740
Actual total capital to risk weighted assets, amount	1,015,826	987,535
Risk Based Ratios
Adequately capitalized requirement, tier 1 capital to average assets (greater than or equal to)	4.00%	4.00%
Adequately capitalized requirement, tier 1 common equity capital to risk weighted assets (greater than or equal to)	4.50%
Adequately capitalized requirement, tier 1 capital to risk weighted assets (greater than or equal to)	6.00%	4.00%
Adequately capitalized requirement, total capital to risk weighted assets (greater than or equal to)	8.00%	8.00%
Leverage Ratios
Actual tier 1 capital to average assets	14.40%	14.30%
Actual tier 1 common equity capital to risk weighted assets	16.00%
Actual tier 1 capital to risk weighted assets	17.30%	18.00%
Actual tier 1 capital to total capital to risk weighted assets	18.20%	19.10%
Capital Bank, N.A.
Tier 1 Leverage Capital
Well capitalized requirement tier 1 capital to average assets, amount	332,757	326,050
Adequately capitalized requirement tier 1 capital to average assets, amount	266,206	260,840
Actual tier 1 capital to average assets	724,780	881,395
Tier 1 Common Equity Capital
Well capitalized requirement tier 1 common equity capital to risk weighted assets, amount	361,237
Adequately capitalized requirement tier 1 common equity capital to risk weighted assets, amount	250,087
Actual tier 1 common equity capital to risk weighted average assets, amount	724,780
Tier 1 Capital
Well capitalized requirement tier 1 capital to risk weighted assets, amount	444,599	310,245
Adequately capitalized requirement tier 1 capital to risk weighted assets, amount	333,449	206,830
Actual tier 1 capital to risk weighted assets, amount	724,780	881,395
Total Capital
Well capitalized requirement total capital to risk weighted assets, amount	555,749	517,074
Adequately capitalized requirement total capital to risk weighted assets, amount	444,599	413,660
Actual total capital to risk weighted assets, amount	$776,855	$935,455
Risk Based Ratios
Well capitalized requirement, tier 1 capital to average assets (greater than or equal to)	5.00%	5.00%
Adequately capitalized requirement, tier 1 capital to average assets (greater than or equal to)	4.00%	4.00%
Well capitalized requirement, tier 1 common equity capital to risk weighted assets (greater than or equal to)	6.50%
Adequately capitalized requirement, tier 1 common equity capital to risk weighted assets (greater than or equal to)	4.50%
Well capitalized requirement, tier 1 capital to risk weighted assets (greater than or equal to)	8.00%	6.00%
Adequately capitalized requirement, tier 1 capital to risk weighted assets (greater than or equal to)	6.00%	4.00%
Well capitalized requirement, total capital to risk weighted assets (greater than or equal to)	10.00%	10.00%
Adequately capitalized requirement, total capital to risk weighted assets (greater than or equal to)	8.00%	8.00%
Leverage Ratios
Actual tier 1 capital to average assets	10.90%	13.50%
Actual tier 1 common equity capital to risk weighted assets	13.00%
Actual tier 1 capital to risk weighted assets	13.00%	17.00%
Actual tier 1 capital to total capital to risk weighted assets	14.00%	18.10%

Shareholders_Equity_and_Minimu3

Shareholders' Equity and Minimum Regulatory Capital Requirements - Additional Information (Detail) (USD $)	0 Months Ended			3 Months Ended		27 Months Ended
	Jan. 30, 2015	Jul. 15, 2014	Sep. 24, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Aug. 31, 2010
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Period of retained net profits				2 years
Approved dividend to Company by subsidiary	$199,400,000	$56,000,000	$105,000,000
Capital conservation buffer				5.98%		5.98%
Stock repurchase, authorized amount				300,000,000		300,000,000
Common shares repurchased				24,996,000	22,660,000
Share Repurchase Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common shares repurchased				25,000,000		198,200,000
Common shares repurchased (in shares)				961,257		9,046,956
Average price of common shares repurchased (in dollars per share)				$25.99		$21.91
Remaining availability for future share repurchases				$101,800,000		$101,800,000
Capital Bank, N.A.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital to risk-weighted assets (at least)				14.00%		14.00%	18.10%
Tier 1 capital to risk-weighted assets (at least)				13.00%		13.00%	17.00%
Tier 1 capital ratio, minimum leverage ratio				10.90%		10.90%	13.50%
Capital Bank, N.A. | Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital to risk-weighted assets (at least)								12.00%
Tier 1 capital to risk-weighted assets (at least)								11.00%
Tier 1 capital ratio, minimum leverage ratio								10.00%

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of compensation plans	2
Tax benefit related to stock-based compensation expense	$100,000	$300,000
Weighted-average requisite service period	2 months
Trading period for determining stock price	30 days
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized stock-based compensation expense	71,000
Weighted average remaining contractual life	5 years 4 months 25 days
Aggregate intrinsic value, outstanding	23,100,000
Aggregate intrinsic value, exercisable	22,000,000
Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized stock-based compensation expense	$38,000
Restricted stock granted	0	0
Restricted stock | Vesting Goal One
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$25
Restricted stock | Vesting Goal Two
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$28
Restricted stock | Vesting Goal Three
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$32
2010 And 2013 Plan | Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock award exercise expiration period from grant date	10 years
Options exercised after ten years	0
Stock options granted	0	0
2010 And 2013 Plan | Stock options | 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock ownership percentage for 110% exercise price (more than)	10.00%
Stock award exercise expiration period from grant date	5 years
2010 And 2013 Plan | Stock options | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Exercise price for common stock as a percentage of fair value (at least)	100.00%
2010 And 2013 Plan | Stock options | Minimum | 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Exercise price for common stock as a percentage of fair value (at least)	110.00%
2013 Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Plan effective date	22-May-13
Plan expiration date	22-May-23
2013 Plan | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares authorized under plan	2,639,000
2013 Plan | Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock granted	0	0

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Components and Classification of Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$284	$728
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	184	195
Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$100	$533

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (Stock options, USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Stock options
Shares
Beginning balance (in shares)	3,111	3,124
Granted (in shares)	0	0
Exercised (in shares)	0	0
Canceled, expired or forfeited (in shares)	-1	-2
Ending balance (in shares)	3,110	3,122
Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$20.26	$20.50
Granted (in dollars per share)	$0	$0
Exercised (in dollars per share)	$0	$0
Canceled, expired or forfeited (in dollars per share)	$589.41	$301.94
Ending balance (in dollars per share)	$20.19	$20.40

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Options Outstanding (Detail) (Stock options, USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices, lower range limit	$18
Exercise prices, upper range limit	$2,026
Outstanding options (in shares)	3,110
Weighted average remaining contractual life, outstanding options	5 years 4 months 25 days
Weighted average exercise price per share, outstanding options (in dollars per share)	$20.19
Exercisable options (in shares)	2,996
Weighted average exercise price per share, exercisable options (in dollars per share)	$20.27
$18.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices, lower range limit	$18
Exercise prices, upper range limit	$18
Outstanding options (in shares)	236
Weighted average remaining contractual life, outstanding options	8 years 1 month 19 days
Weighted average exercise price per share, outstanding options (in dollars per share)	$18
Exercisable options (in shares)	122
Weighted average exercise price per share, exercisable options (in dollars per share)	$18
$20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices, lower range limit	$20
Exercise prices, upper range limit	$20
Outstanding options (in shares)	2,864
Weighted average remaining contractual life, outstanding options	5 years 2 months 5 days
Weighted average exercise price per share, outstanding options (in dollars per share)	$20
Exercisable options (in shares)	2,864
Weighted average exercise price per share, exercisable options (in dollars per share)	$20
$28.44 - $2,026.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices, lower range limit	$28.44
Exercise prices, upper range limit	$2,026
Outstanding options (in shares)	10
Weighted average remaining contractual life, outstanding options	3 years 1 month 1 day
Weighted average exercise price per share, outstanding options (in dollars per share)	$122.48
Exercisable options (in shares)	10
Weighted average exercise price per share, exercisable options (in dollars per share)	$122.48

StockBased_Compensation_Summar3

Stock-Based Compensation - Summary of Unvested Restricted Stock Activity (Detail) (Restricted stock, USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restricted stock
Shares
Beginning balance (in shares)	810,000	1,215,000
Granted (in shares)	0	0
Vested or released (in shares)	0	0
Canceled, expired or forfeited (in shares)	0	0
Ending balance (in shares)	810,000	1,215,000
Weighted Average Grant-Date Fair Value Per Share
Beginning balance (in dollars per share)	$13.89	$14.28
Granted (in dollars per share)	$0	$0
Vested or released (in dollars per share)	$0	$0
Canceled, expired or forfeited (in dollars per share)	$0	$0
Ending balance (in dollars per share)	$13.89	$14.28

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Income Tax Computed at Applicable Federal Statutory Income Tax Rates to Total Income Taxes (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income before income taxes	$17,843	$18,622
Income taxes computed at Federal statutory tax rate	6,245	6,518
Effect of:
State taxes (net of federal benefit)	452	709
Tax-exempt interest income, net	-489	-175
Contingent value right expense (CVR)	0	268
Other, net	246	-112
Total income tax expense	$6,454	$7,208

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	36.00%	39.00%
Net deferred tax assets	$121,100,000		$129,600,000
Valuation allowance	0		0
Operating loss carryforwards	81,900,000		91,100,000
Amount of annual commutative limitation	10,900,000
Unrecognized tax benefits	0		0
Uncertain tax positions	$0		$0

Fair_Value_Assets_and_Liabilit

Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Trading securities	$2,853	$2,410
Available-for-sale securities:
Available-for-sale securities	575,593	555,893
Gross asset value of derivatives	703	4
Liabilities
Gross liability value of derivatives	73	26
Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	3,537	3,690
Corporate bonds
Available-for-sale securities:
Available-for-sale securities	22,484
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	0	0
Gross asset value of derivatives	0	0
Liabilities
Gross liability value of derivatives	0	0
Significant Other Observable Inputs (Level 2)
Assets
Trading securities	2,853	2,410
Available-for-sale securities:
Available-for-sale securities	572,056	552,203
Gross asset value of derivatives	703	4
Liabilities
Gross liability value of derivatives	73	26
Significant Unobservable Inputs (Level 3)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	3,537	3,690
Gross asset value of derivatives	0	0
Liabilities
Gross liability value of derivatives	0	0
Fair Value on Recurring Basis
Assets
Trading securities	2,853	2,410
Available-for-sale securities:
Available-for-sale securities	575,593	555,893
Gross asset value of derivatives	703	4
Liabilities
Gross liability value of derivatives	73	26
Fair Value on Recurring Basis | Mortgage-backed securities—residential
Available-for-sale securities:
Available-for-sale securities	549,572	552,203
Fair Value on Recurring Basis | Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	3,537	3,690
Fair Value on Recurring Basis | Corporate bonds
Available-for-sale securities:
Available-for-sale securities	22,484
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	0	0
Gross asset value of derivatives	0	0
Liabilities
Gross liability value of derivatives	0	0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities—residential
Available-for-sale securities:
Available-for-sale securities	0	0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	0	0
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Available-for-sale securities:
Available-for-sale securities	0
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets
Trading securities	2,853	2,410
Available-for-sale securities:
Available-for-sale securities	572,056	552,203
Gross asset value of derivatives	703	4
Liabilities
Gross liability value of derivatives	73	26
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities—residential
Available-for-sale securities:
Available-for-sale securities	549,572	552,203
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	0	0
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Available-for-sale securities:
Available-for-sale securities	22,484
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	3,537	3,690
Gross asset value of derivatives	0	0
Liabilities
Gross liability value of derivatives	0	0
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities—residential
Available-for-sale securities:
Available-for-sale securities	0	0
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	3,537	3,690
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Corporate bonds
Available-for-sale securities:
Available-for-sale securities	$0

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned	$71,453,000	$77,626,000	$120,270,000	$129,396,000
Transfers of assets and liabilities between levels of the fair value	0	0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned, gross	73,200,000	85,100,000
Other real estate owned, valuation allowance	$18,400,000	$19,100,000

Fair_Value_Fair_Value_Measurem

Fair Value - Fair Value Measurements on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (Fair Value on Recurring Basis, Significant Unobservable Inputs (Level 3), Industrial revenue bonds, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Industrial revenue bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$3,690	$3,859
Principal reduction	-170	-170
Included in other comprehensive income	17	38
Ending balance	$3,537	$3,727

Fair_Value_Quantitative_Inform

Fair Value - Quantitative Information About Recurring Level 3 Fair Value Measurements (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Transfers of assets and liabilities between levels of the fair value	$0	$0
Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	5,507,136,000	5,403,670,000
Significant Unobservable Inputs (Level 3) | Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$3,537,000	$3,690,000
Illiquidity factor	0.50%	0.50%
Significant Unobservable Inputs (Level 3) | Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	3.06%	3.50%
Significant Unobservable Inputs (Level 3) | Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	3.09%	3.60%

Fair_Value_Assets_and_Liabilit1

Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$71,453	$77,626	$120,270	$129,396
Fair Value on Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate Owned, Fair Value Disclosure	0	0
Other repossessed assets	0	0
Impaired loans	0	0
Fair Value on Nonrecurring Basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate Owned, Fair Value Disclosure	0	0
Other repossessed assets	301	150
Impaired loans	0	0
Fair Value on Nonrecurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate Owned, Fair Value Disclosure	54,862	66,048
Other repossessed assets	0	0
Impaired loans	$625	$754

Fair_Value_Quantitative_Inform1

Fair Value - Quantitative Information About Nonrecurring Level 3 Fair Value Measurements (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$71,453	$77,626	$120,270	$129,396
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	5,203,970	5,124,231
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	6,493,077	6,319,539
Other real estate owned | Fair Value of Property | Fair Value on Nonrecurring Basis | Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	54,862	66,048
Weighted Average	7.85%	7.86%
Impaired loans | Fair Value of Collateral | Fair Value on Nonrecurring Basis | Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$625	$754
Weighted Average	7.70%	7.60%

Fair_Value_Carrying_Amounts_an

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Assets
Trading securities	$2,853		$2,410
Investment securities available-for-sale	575,593		555,893
Investment securities held-to-maturity	457,939		443,379
FDIC indemnification asset	15,195		16,762		28,744	33,610
Gross asset value of derivatives	703		4
Financial Liabilities
Contractual deposits	1,428,121		1,418,700
Federal Home Loan Bank advances	356,043		296,091
Gross liability value of derivatives	73		26
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Cash and cash equivalents	239,981		188,135
Trading securities	0		0
Investment securities available-for-sale	0		0
Investment securities held-to-maturity	0		0
Loans, net	0		0
FDIC indemnification asset	0		0
Receivable from FDIC	0		0
Other earning assets	0	[1]	0	[1]
Gross asset value of derivatives	0		0
Total financial assets	239,981		188,135
Financial Liabilities
Non-contractual deposits	0		0
Contractual deposits	0		0
Federal Home Loan Bank advances	0		0
Short-term borrowings	0		0
Long-term borrowings	0		0
Subordinated debentures	0		0
Gross liability value of derivatives	0		0
Total financial liabilities	0		0
Significant Other Observable Inputs (Level 2)
Financial Assets
Cash and cash equivalents	0		0
Trading securities	2,853		2,410
Investment securities available-for-sale	572,056		552,203
Investment securities held-to-maturity	457,939		443,379
Loans, net	12,403		5,516
FDIC indemnification asset	0		0
Receivable from FDIC	3,172		3,661
Other earning assets	0	[1]	0	[1]
Gross asset value of derivatives	703		4
Total financial assets	1,049,126		1,007,173
Financial Liabilities
Non-contractual deposits	0		0
Contractual deposits	0		0
Federal Home Loan Bank advances	353,002		296,038
Short-term borrowings	27,605		23,407
Long-term borrowings	0		0
Subordinated debentures	0		0
Gross liability value of derivatives	73		26
Total financial liabilities	380,680		319,471
Significant Unobservable Inputs (Level 3)
Financial Assets
Cash and cash equivalents	0		0
Trading securities	0		0
Investment securities available-for-sale	3,537		3,690
Investment securities held-to-maturity	0		0
Loans, net	5,132,297		5,052,836
FDIC indemnification asset	15,195		16,762
Receivable from FDIC	0		0
Other earning assets	52,941	[1]	50,943	[1]
Gross asset value of derivatives	0		0
Total financial assets	5,203,970		5,124,231
Financial Liabilities
Non-contractual deposits	3,935,435		3,836,400
Contractual deposits	1,426,066		1,415,122
Federal Home Loan Bank advances	0		0
Short-term borrowings	0		0
Long-term borrowings	54,148		54,235
Subordinated debentures	91,487		97,913
Gross liability value of derivatives	0		0
Total financial liabilities	5,507,136		5,403,670
Carrying Value
Financial Assets
Cash and cash equivalents	239,981		188,135
Trading securities	2,853		2,410
Investment securities available-for-sale	575,593		555,893
Investment securities held-to-maturity	448,962		436,962
Loans, net	5,029,784		4,950,008
FDIC indemnification asset	15,195		16,762
Receivable from FDIC	3,172		3,661
Other earning assets	52,941	[1]	50,943	[1]
Gross asset value of derivatives	703		4
Total financial assets	6,369,184		6,204,778
Financial Liabilities
Non-contractual deposits	3,935,435		3,836,400
Contractual deposits	1,428,121		1,418,700
Federal Home Loan Bank advances	356,043		296,091
Short-term borrowings	27,605		23,407
Long-term borrowings	52,295		52,526
Subordinated debentures	87,680		87,155
Gross liability value of derivatives	73		26
Total financial liabilities	5,887,252		5,714,305
Estimated Fair Value
Financial Assets
Cash and cash equivalents	239,981		188,135
Trading securities	2,853		2,410
Investment securities available-for-sale	575,593		555,893
Investment securities held-to-maturity	457,939		443,379
Loans, net	5,144,700		5,058,352
FDIC indemnification asset	15,195		16,762
Receivable from FDIC	3,172		3,661
Other earning assets	52,941		50,943	[1]
Gross asset value of derivatives	703		4
Total financial assets	6,493,077		6,319,539
Financial Liabilities
Non-contractual deposits	3,935,435		3,836,400
Contractual deposits	1,426,066		1,415,122
Federal Home Loan Bank advances	353,002		296,038
Short-term borrowings	27,605		23,407
Long-term borrowings	54,148		54,235
Subordinated debentures	91,487		97,913
Gross liability value of derivatives	73		26
Total financial liabilities	$5,887,816		$5,723,141
[1]	Includes Federal Reserve Bank, Federal Home Loan Bank and Bankers Bank stocks.

Derivative_and_Hedging_Activit2

Derivative and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	cash_flow_hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedge length of time	5 years
Estimated gain to be reclassified to interest income in the next twelve months	$900,000
Discontinued cash flow hedges	0
Gain (loss) reclassified into earnings due to discontinuance	0
Liability Derivatives, Fair Value	73,000		26,000
Non-Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative	5,000	1,100,000
Non-Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative	($47,000)	($900,000)

Derivative_and_Hedging_Activit3

Derivative and Hedging Activities - Summary of Derivative Instrument Contracts at Fair Value and Balance Sheet Classification(Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	$703	$4
Asset Derivatives, Notional Amount	72,454	1,640
Liability Derivatives, Fair Value	73	26
Liability Derivatives, Notional Amount	15,478	7,578
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	695
Liability Derivatives, Fair Value	0
Derivatives designated as hedging instruments | Interest rate swap
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	695
Liability Derivatives, Fair Value	0
Derivatives designated as hedging instruments | Interest rate swap | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Number of Instruments Held	1
Gross asset value of derivatives	695	0
Asset Derivatives, Notional Amount	70,000	0
Derivatives designated as hedging instruments | Interest rate swap | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Number of Instruments Held	0
Liability Derivatives, Fair Value	0	0
Liability Derivatives, Notional Amount	0	0
Derivatives not designated as hedging instruments | Forward loan sales contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Number of Instruments Held	9
Gross asset value of derivatives	8	4
Asset Derivatives, Notional Amount	2,454	1,640
Derivatives not designated as hedging instruments | Forward loan sales contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Number of Instruments Held	75
Liability Derivatives, Fair Value	73	26
Liability Derivatives, Notional Amount	$15,478	$7,578

Derivative_and_Hedging_Activit4

Derivative and Hedging Activities -Summary of Derivative Instrument on the Consolidated Statements of Income (Details) (Interest rate swap, Derivatives designated as hedging instruments, Cash Flow Hedging, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Accumulated OCI on Derivative (Effective Portion)	$803
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	0
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Reclassified from Accumulated OCI on Derivative (Effective Portion)	$108

Derivative_and_Hedging_Activit5

Derivative and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Offsetting of derivative assets:
Offsetting of Derivative Assets, Gross Amount of Recognized Assets	$703	$4
Offsetting of derivative liabilities:
Offsetting of Derivative Liabilities, Gross Amount of Recognized Assets	73	26
Derivatives designated as hedging instruments
Offsetting of derivative assets:
Offsetting of Derivative Assets, Gross Amount of Recognized Assets	695
Offsetting of Derivative Assets, Gross Amount Offset in the Balance Sheets	0
Offsetting of Derivative Assets, Net Amount of Assets Presented in the Balance Sheets	695
Offsetting of Derivative Assets, Gross Amounts Not Offset in the Balance Sheet, Offsetting of Derivative Assets, Financial Instruments	0
Offsetting of Derivative Assets, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received	560
Offsetting of Derivative Assets, Net Amount	135
Offsetting of derivative liabilities:
Offsetting of Derivative Liabilities, Gross Amount of Recognized Assets	0
Offsetting of Derivative Liabilities, Gross Amount Offset in the Balance Sheets	0
Offsetting of Derivative Liabilities, Net Amount of Assets Presented in the Balance Sheets	0
Offsetting of Derivative Liabilities, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	0
Offsetting of Derivative Liabilities, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received	0
Offsetting of Derivative Liabilities, Net Amount	0
Derivatives designated as hedging instruments | Interest Rate Swap
Offsetting of derivative assets:
Offsetting of Derivative Assets, Gross Amount of Recognized Assets	695
Offsetting of Derivative Assets, Gross Amount Offset in the Balance Sheets	0
Offsetting of Derivative Assets, Net Amount of Assets Presented in the Balance Sheets	695
Offsetting of Derivative Assets, Gross Amounts Not Offset in the Balance Sheet, Offsetting of Derivative Assets, Financial Instruments	0
Offsetting of Derivative Assets, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received	560
Offsetting of Derivative Assets, Net Amount	135
Offsetting of derivative liabilities:
Offsetting of Derivative Liabilities, Gross Amount of Recognized Assets	0
Offsetting of Derivative Liabilities, Gross Amount Offset in the Balance Sheets	0
Offsetting of Derivative Liabilities, Net Amount of Assets Presented in the Balance Sheets	0
Offsetting of Derivative Liabilities, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	0
Offsetting of Derivative Liabilities, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received	0
Offsetting of Derivative Liabilities, Net Amount	$0