Capital Bank Financial (CBF) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014	Jan. 31, 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-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$623.30
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			30,184,937
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			17,407,984

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$106,193	$118,937
Interest-bearing deposits in other banks	81,942	45,504
Total cash and cash equivalents	188,135	164,441
Trading securities	2,410	6,348
Investment securities available-for-sale at fair value (amortized cost $554,488 and $688,717, respectively)	555,893	685,441
Investment securities held-to-maturity at amortized cost (fair value $443,379 and $459,693, respectively)	436,962	465,098
Loans held for sale	5,516	8,012
Loans, net of deferred loan costs and fees	4,994,703	4,544,017
Less: Allowance for loan and lease losses	50,211	56,851
Loans, net	4,944,492	4,487,166
Other real estate owned	77,626	129,396
FDIC indemnification asset	16,762	33,610
Receivable from FDIC	3,661	7,624
Premises and equipment, net	173,176	179,855
Goodwill	134,522	131,987
Intangible assets, net	18,897	23,365
Deferred income tax asset, net	129,624	166,762
Other assets	143,734	128,456
Total Assets	6,831,410	6,617,561
Deposits:
Non-interest bearing demand	1,054,128	923,993
Negotiable order of withdrawal	1,383,990	1,321,903
Money market	898,254	961,526
Savings	500,028	530,144
Time deposits	1,418,700	1,447,497
Total deposits	5,255,100	5,185,063
Federal Home Loan Bank advances	296,091	96,278
Short-term borrowings	23,407	24,850
Long-term borrowings	139,681	138,561
Accrued expenses and other liabilities	53,557	60,021
Total liabilities	5,767,836	5,504,773
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	1,081,628	1,082,235
Retained earnings	158,403	107,485
Accumulated other comprehensive loss	-3,824	-7,528
Treasury stock, at cost, 8,086 and 3,761 shares, respectively	-173,190	-69,962
Total shareholders’ equity	1,063,574	1,112,788
Total Liabilities and Shareholders’ Equity	6,831,410	6,617,561
Common Class A
Shareholders’ equity
Common stock	370	362
Total shareholders’ equity	370	362
Common Class B
Shareholders’ equity
Common stock	187	196
Total shareholders’ equity	$187	$196

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Amortized cost of investment securities available-for-sale	$554,488	$688,717
Fair value of investment securities held-to-maturity	$443,379	$459,693
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, authorized shares	50,000,000	50,000,000
Preferred stock, issued shares	0	0
Treasury stock, shares	8,086,000	3,761,000
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	36,936,000	36,212,000
Common stock, shares outstanding	30,150,000	33,051,000
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	18,743,000	19,647,000
Common stock, shares outstanding	17,443,000	19,047,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest and dividend income
Loans, including fees	$248,588	$273,874	$273,000
Investment securities:
Taxable interest income	18,997	16,611	17,704
Tax-exempt interest income	611	641	835
Dividends	58	60	65
Interest-bearing deposits in other banks	105	543	828
Other earning assets	2,423	2,027	1,848
Total interest and dividend income	270,782	293,756	294,280
Interest expense
Deposits	17,451	22,052	29,509
Long-term borrowings	6,886	8,072	8,594
Federal Home Loan Bank advances	349	14	885
Other borrowings	36	43	68
Total interest expense	24,722	30,181	39,056
Net Interest Income	246,060	263,575	255,224
Provision (reversal) for loan and lease losses	-589	14,118	24,491
Net interest income after provision (reversal) for loan and lease losses	246,649	249,457	230,733
Non-Interest Income
Service charges on deposit accounts	22,063	24,569	24,011
Debit card income	11,977	11,533	10,516
Fees on mortgage loans originated and sold	4,130	5,401	5,994
Investment advisory and trust fees	4,524	2,455	1,368
FDIC indemnification asset (expense) income	-11,531	-5,656	1,325
Legal settlements and insurance recoveries	0	1,900	3,460
Investment securities gains, net	976	122	8,619
Gross impairment loss	0	-54	-44
Less: Impairment recognized in other comprehensive income	0	0	0
Net impairment loss recognized in earnings	0	-54	-44
Other income	11,668	12,696	7,459
Total non-interest income	43,807	52,966	62,708
Non-Interest Expense
Salaries and employee benefits	93,408	90,059	91,611
Stock-based compensation expense	2,642	5,439	18,681
Net occupancy and equipment expense	33,817	34,916	33,794
Computer services	13,387	12,965	9,700
Software expense	7,814	7,504	5,466
Telecommunication expense	5,989	6,451	5,642
OREO valuation expense	10,901	22,034	22,498
Net gains on sales of OREO	-4,555	-3,482	-3,801
Foreclosed asset related expense	3,914	5,955	9,531
Loan workout expense	4,557	8,045	7,508
Conversion and merger related expense	0	234	7,543
Professional fees	7,690	9,827	12,937
(Gains) losses on extinguishment of debt	0	-122	3,267
Legal settlement expense	0	543	2,752
Impairment of intangible assets	0	0	202
Contingent value right expense	1,706	2,833	187
Regulatory assessments	6,619	6,923	6,716
Other expense	20,958	26,085	25,724
Total non-interest expense	208,847	236,209	259,958
Income before income taxes	81,609	66,214	33,483
Income tax expense (benefit)	30,691	27,370	-21,542
Net income before attribution of noncontrolling interests	50,918	38,844	55,025
Net income attributable to noncontrolling interests	0	0	4,534
Net income attributable to Capital Bank Financial Corp.	$50,918	$38,844	$50,491
Earnings per share:
Earnings per share, basic (in dollars per share)	$1.05	$0.74	$1.06
Earnings per share, diluted (in dollars per share)	$1.02	$0.73	$1.04
Weighted average shares outstanding:
Weighted average number of shares outstanding, basic	48,610	52,614	47,779
Weighted average number of shares outstanding, diluted	49,869	53,493	48,337

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$50,918	$38,844	$55,025
Other comprehensive income (loss) before tax:
Unrealized holding gains (losses) on investment securities available-for-sale	5,815	-18,304	10,520
Unrealized holding losses on investment securities transferred from available-for-sale to held-to-maturity	0	-9,747	0
Reclassification adjustment for losses realized in net income on securities available-for-sale	-1,134	-151	-8,448
Reclassification adjustment for losses amortized in net income on securities held-to-maturity	1,444	758	0
Other comprehensive income (loss), before tax:	6,125	-27,444	2,072
Tax effect	-2,421	10,569	-779
Other comprehensive income (loss), net of tax:	3,704	-16,875	1,293
Comprehensive income	54,622	21,969	56,318
Less: Comprehensive income attributable to noncontrolling interests	0	0	4,895
Comprehensive income attributable to Capital Bank Financial Corp.	$54,622	$21,969	$51,423

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Class A	Common Class B	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non controlling interests
In Thousands
Beginning balance at Dec. 31, 2011	$990,910	$200	$261	$890,627	$18,150	$7,167		$74,505
Beginning balance, shares at Dec. 31, 2011		20,028	26,122
Net income	55,025				50,491			4,534
Other comprehensive income, net of tax expense (benefit)	1,293					932		361
Stock-based compensation	18,753			18,740				13
Restricted stock grants, shares		306
Restricted stock grants, value		3		-3
Issuance of shares for noncontrolling interest and merger, shares		3,706
Issuance of shares for noncontrolling interest and merger, value	-35	37		78,093		1,248		-79,413
Initial public offering, shares		5,684
Initial public offering, value	89,397	57		89,340
Conversion of shares, shares		3,301	-3,301
Conversion of shares, value		33	-33
Ending balance at Dec. 31, 2012	1,155,343	330	228	1,076,797	68,641	9,347
Ending balance, shares at Dec. 31, 2012		33,025	22,821
Net income	38,844				38,844
Other comprehensive income, net of tax expense (benefit)	-16,875					-16,875
Stock-based compensation	5,439			5,439
Restricted stock grants, shares		4
Purchase of treasury stock, shares		-3,161	-600
Purchase of treasury stock, value	-69,962						-69,962
Fractional shares, shares			9
Fractional shares, value	-1			-1
Conversion of shares, shares		3,183	-3,183
Conversion of shares, value		32	-32
Ending balance at Dec. 31, 2013	1,112,788	362	196	1,082,235	107,485	-7,528	-69,962
Ending balance, shares at Dec. 31, 2013		33,051	19,047
Net income	50,918				50,918
Other comprehensive income, net of tax expense (benefit)	3,704					3,704
Stock-based compensation	2,642			2,642
Full value stock awards , shares		12
Excess tax benefit from share-based payment	1,603			1,603
Restricted stock cancelled, shares		-192
Restricted stock cancelled, value	-4,853	-1		-4,852
Purchase of treasury stock, shares		-3,625	-700
Purchase of treasury stock, value	-103,228						-103,228
Conversion of shares, shares		904	-904
Conversion of shares, value		9	-9
Ending balance at Dec. 31, 2014	$1,063,574	$370	$187	$1,081,628	$158,403	($3,824)	($173,190)
Ending balance, shares at Dec. 31, 2014		30,150	17,443

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Accumulated Other Comprehensive Income (Loss), USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income tax expense (benefit)	$2,421	$10,569	$779

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Net income	$50,918	$38,844	$55,025
Adjustments to reconcile net income to net cash used in operating activities:
Accretion of purchased credit impaired loans	-119,701	-161,867	-193,425
Depreciation and amortization	18,769	20,843	14,579
Provision (reversal) for loan and lease losses	-589	14,118	24,491
Deferred income tax	32,181	26,964	-15,940
Net amortization of investment securities premium/discount	8,606	12,091	12,569
Other than temporary impairment of investment securities	0	54	44
Net realized gains on sales of investment securities	-976	-122	-8,619
Stock-based compensation expense	2,642	5,439	18,681
Net gains on sales of OREO	-4,555	-3,482	-3,801
OREO valuation expense	10,901	22,034	22,498
Other	58	-5	301
Net deferred loan origination fees	-6,334	-3,120	-1,182
(Gains) losses on extinguishment of debt	0	-122	3,267
Mortgage loans originated for sale	-144,761	-173,435	-208,087
Proceeds from sales of mortgage loans originated for sale	151,387	182,101	223,551
Fees on mortgage loans originated and sold	-4,130	-5,401	-5,994
FDIC indemnification asset expense (income)	11,531	5,656	-1,325
(Gains) losses on sales/disposals of premises and equipment	-22	-447	89
Gains on exchange of partnership interests	0	-1,536	0
Proceeds from FDIC loss share agreements	10,723	14,265	27,030
Change in other assets	-10,151	2,047	-10,277
Change in accrued expenses and other liabilities	-11,177	4,493	-28,702
Net cash used in operating activities	-4,680	-588	-75,227
Cash flows from investing activities
Purchases of investment securities available-for-sale	-191,979	-436,459	-919,444
Purchases of investment securities held-to-maturity	-44,143	0	0
Sales of investment securities available-for-sale	216,861	225	340,026
Repayments of principal and maturities of investment securities available-for-sale	107,872	206,246	586,937
Repayments of principal and maturities of investment securities held-to-maturity	71,507	44,878	0
Net (purchases) sales of FHLB and FRB stock	-6,569	-5,158	4,749
Net cash acquired through acquisition of SCMF	0	0	156,942
Purchase of trademark	0	0	-100
Net (increase) decrease in loans	-375,652	262,564	484,887
Proceeds from sales of loans	10,002	0	0
Purchases of premises and equipment	-6,840	-3,072	-13,994
Proceeds from sales of premises and equipment	139	7,490	-26
Proceeds from sales of OREO	80,393	75,548	99,704
Net cash (used in) provided by investing activities	-138,409	152,262	739,681
Cash flows from financing activities
Net increase (decrease) in demand, money market and savings accounts	98,834	-64,604	257,010
Net decrease in time deposits	-28,797	-623,201	-603,240
Net decrease in federal funds purchased and securities sold under agreement to repurchase	-1,442	-16,658	-25,533
Decrease in long-term repurchase agreements	0	0	-60,000
Net increase in short-term FHLB advances	200,000	95,000	0
Decrease in long-term FHLB advances	-187	-182	-297,142
Prepayments of long-term borrowings	0	-42,500	0
Excess tax benefit from share-based payment	1,603	0	0
Purchases of treasury stock	-103,228	-69,962	0
Proceeds from initial public offering	0	0	89,397
Cash paid for non-controlling interest	0	0	-35
Net cash provided by (used in) financing activities	166,783	-722,107	-639,543
Net increase (decrease) in cash and cash equivalents	23,694	-570,433	24,911
Cash and cash equivalents at beginning of period	164,441	734,874	709,963
Cash and cash equivalents at end of period	188,135	164,441	734,874
Supplemental disclosures of cash:
Interest paid	25,138	31,509	44,427
Cash collections of contractual interest on purchased credit impaired loans	86,006	116,807	167,907
Income taxes paid	1,245	1,741	16,781
Supplemental disclosures of non-cash transactions:
OREO acquired through loan transfers and acquisitions	34,970	69,403	104,739
Transfers of OREO to premises and equipment	0	0	1,026
Transfers of financed portion of premises and equipment sold	0	0	930
Non-cash portion of acquired premises and equipment	0	0	2,717
Net acquisition of non-cash (liabilities)	0	0	-156,942
Transfer of available-for-sale securities to held-to-maturity securities	0	510,976	0
Elimination of noncontrolling interest	$0	$0	$79,413

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Summary of Significant Accounting Policies
	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 consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All significant inter-company accounts and transactions have been eliminated in consolidation. The following is a summary of the more significant accounting policies.
	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.
	Out of Period Adjustment
	During the three months ended March 31, 2014, the Company recorded a correction of an error resulting from the state net operating loss that the Company was not entitled to subsequent to the 2011 Green Bankshares acquisition. The impact of this correction decreased deferred tax assets and increased goodwill by $2.5 million. After evaluating the quantitative and qualitative aspects of this error, the Company concluded that its prior period financial statements were not materially misstated.
	Cash and Cash Equivalents
	Cash and cash equivalents include cash on hand and highly-liquid items with an original maturity of three months or less including amounts due from banks, federal funds sold, and interest-bearing deposits at the Federal Home Loan Bank (“FHLB”) and the Federal Reserve Bank of Atlanta (“FRB”). Accordingly, the carrying amount of such instruments is considered to be a reasonable estimate of fair value.
	Trading Securities
	Marketable equity securities are recorded on a trade-date basis and are accounted for based on the securities’ quoted market prices from a national securities exchange. Those purchased with the intention of recognizing short-term profits are classified as and included in trading securities on our balance sheet. Both realized and unrealized gains and losses on trading securities are included in noninterest income.
	Investment Securities and Other than Temporary Impairment
	Investment securities which may be sold prior to maturity are classified as available-for-sale and are carried at fair value, with unrealized gains and losses reported in other comprehensive income. Other securities such as Federal Home Loan Bank stock are carried at cost and are included in other assets on the balance sheets. Investment securities where the Company has both the intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost.
	Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized using the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are realized on the trade date and determined using the specific identification method based on the amortized cost of the security sold.
	Management regularly reviews each investment security for impairment based on criteria that include the extent to which cost exceeds fair value, the financial health of and specific prospects for the issuer(s) and our ability and intention with regard to holding the security. Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. In determining OTTI under accounting guidance, management considers many factors, including but not limited to: (1) the financial condition and near-term prospects of the issuer, (2) whether the market decline was affected by macroeconomic conditions, and (3) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery.
	The assessment of whether an OTTI exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time. When OTTI is determined to have occurred, the amount of the impairment recognized in earnings depends on whether management intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, less any current-period credit loss. If management intends to sell or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, less any current-period credit loss, the impairment is required to be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If management does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the credit worthiness of the issuer is analyzed to determine if there is a credit component of the unrealized loss that would require recognition in earnings. Impairment identified through this analysis is separated into the amount representing the credit loss and the amount related to all other factors (i.e., changes in market interest rates, liquidity premiums, etc.). The amount of impairment related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized in earnings. The amount of the impairment related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment. Future declines in the fair value of securities may result in impairment charges which may be material to the financial condition and results of operations of the Company.
	Loans Held for Sale
	Certain residential fixed rate mortgage loans originated by the Company are sold to third parties on a servicing released basis. Certain of these sales are subject to temporary recourse provisions. The recourse provisions may require the repurchase of the outstanding balance of loans which default within a limited period of time subsequent to the sale. The recourse periods vary by investor and extend up to seven months subsequent to the sale of the loan. All origination fees are recognized as income at the time of the sale. Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or market, as determined by outstanding commitments from investors. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings.
	Purchased Credit-Impaired Loans
	When it is probable that the Company will not collect all contractual cash flows associated with acquired loans, unless specifically exempt, these acquired loans are accounted for under accounting guidance for purchased credit-impaired (“PCI”) loans. Any Allowance for Loan and Lease Losses (“the Allowance”) previously associated with these loans does not carry over to the Company and is eliminated in the purchase accounting adjustments. The fair value of the PCI loans is then assigned based on the present value of estimated future cash flows including prepayments but exclusive of any loss-sharing arrangements. The excess of the gross cash flows expected to be collected over the present value of cash flows at the acquisition date (i.e., the accretable yield) is accreted into income over the estimated remaining term of the PCI loans using the effective yield method, provided that the timing and amount of future cash flows is reasonably estimable. Accordingly, such loans are not classified as nonaccrual as the accretable yield is reported as interest income. The impact of changes in variable interest rates is recognized prospectively as adjustments to the accretable yield.
	For further discussion of the Company’s acquisitions and loan accounting, see Note 3. Business Combinations and Acquisitions and Note 5. Loans, respectively.
	New Loans and Acquired Non-PCI Loans
	New loans that management has the intent and ability to hold are reported at the principal balance outstanding, net of deferred loan fees and costs, and an allowance for loan and lease losses. Acquired non-PCI loans are initially reported at their acquisition date fair value. Subsequently, acquired non-PCI loans are reported net of amortization or accretion of any applicable acquisition discount or premium and an allowance for loan and lease losses. Interest income on New and non-PCI acquired loans is reported on the interest method and includes amortization of net deferred loan fees, costs and any applicable acquisition discount or premium over the loan term. Amortization of deferred loan fees and costs is based on the contractual lives of the loans and does not include anticipation of prepayments. If the collectability of interest appears doubtful, the loan is classified as nonaccrual.
	Nonaccrual Loans
	The majority of loans are placed on nonaccrual status when it is probable that principal or interest is not fully collectible, or generally when principal or interest becomes 90 days past due, whichever occurs first. Certain loans past due 90 days or more may remain on accrual status if management determines that it does not have concern over the collectability of principal and interest and such loans are in the process of collection.
	Generally, when loans are placed on nonaccrual status, accrued and unpaid interest receivable is reversed against interest income in the current period. Interest payments received thereafter are generally applied as a reduction to the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans are generally removed from nonaccrual status when they become current as to both principal and interest and concern no longer exists as to the collectability of principal and interest. The Company’s policies related to when loans are placed on nonaccrual status conform to guidelines prescribed by bank regulatory authorities.
	Direct Financing Leases
	Direct financing leases are carried at the aggregate of lease payments receivable and estimated residual value of the leased property, if applicable, less unearned income. Interest income on direct financing leases is recognized over the term of the leases to achieve a constant periodic rate of return on the outstanding investment. Initial direct costs are deferred and amortized over the lease term as a reduction to interest income using the effective interest method.
	Allowance for Loan and Lease Losses
	The Company maintains an allowance for loan and lease losses to absorb losses incurred in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable estimated incurred losses inherent in the portfolio of loans held for investment. The allowance is increased by the provision for loan and lease losses, which is charged against current period operating results and decreased by the amount of charge offs, net of recoveries. The Company’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the formulaic allowance and the specific allowance for impaired loans.
	Management develops and documents its systematic methodology for determining the allowance for loan and lease losses by first dividing its portfolio into segments-commercial real estate, commercial, consumer and other. The Company further divides the portfolio segments into classes and subclasses based on initial measurement attributes, risk characteristics or its method of monitoring and assessing credit risk (such as owner occupied commercial real estate, for which the Company believes risk characteristics and cash flows are aligned with the Commercial class).
	The classes and subclasses for the Company are as follows:
	Commercial real estate
	•	Non-owner occupied commercial real estate
	•	Other commercial construction and land
	•	Multifamily commercial real estate
	•	1-4 family residential construction and land
	Commercial
	•	Owner occupied commercial real estate
	•	Commercial and industrial
	•	Lease Financing
	Consumer
	•	1-4 family residential
	•	HELOC
	•	Junior lien
	•	Other consumer loans
	•	Indirect auto
	Other
	•	Farmland
	•	Agriculture
	•	All other loans
	For non-PCI loans, the allowance for loan and lease losses is calculated by applying loss factors to outstanding loans. It is the Company’s policy to use loss factors based on historical loss experience which may be adjusted for significant factors that, in management’s judgment, affect the collectability of the portfolio as of the evaluation date. The Company has limited historical loss experience on newly originated loans and the historical loss information available relating to the portfolios of acquired loans is considered by management to be irrelevant to newly originated loans due to differences in underwriting criteria and loan type. Accordingly, the Company currently is utilizing loss rates from a peer group of comparable banks based on size, portfolio type and geography as the basis for determining loss factors to apply to any outstanding loans. The Company derives the loss factors for all segments from pooled loan loss factors. Such pooled loan loss factors (for loans not individually graded) are based on expected net charge off ranges. Loan loss factors, which are used in determining the allowance, are adjusted quarterly primarily based upon the changes in the level of historical net charge offs and parameter updates by management. Management estimates probable incurred losses in the portfolio based on a historical loss look-back period. The look-back period is representative of management’s consideration of relevant historical loss experience.
	Furthermore, based on management’s judgment, the Company’s methodology permits adjustments to any loss factor used in the computation of the allowance for significant factors, which affect the collectability of the portfolio as of the evaluation date, but are not reflected in the loss factors. By assessing the probable estimated incurred losses in the loan portfolio on a quarterly basis, management is able to adjust specific and inherent loss estimates based upon the most recent information that has become available. This includes changing the number of periods that are included in the calculation of the loss factors and adjusting qualitative factors to be representative of the current economic cycle and other factors impacting the portfolio.
	Generally, for Commercial loans, the Company evaluates individual nonaccrual loans with recorded investment balances greater than or equal to $0.5 million and substandard but accruing loans with recorded investment balances greater than or equal to $1.0 million for impairment. Residential mortgage and consumer loans are generally not individually evaluated for impairment unless they become non-accrual and exceed $0.5 million in recorded investment or represent troubled debt restructuring. Loans are considered impaired when the individual evaluation of current information regarding the borrower’s financial condition, loan collateral, and cash flows indicates that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, including interest payments. Impaired loans are carried at the lower of the recorded investment in the loan, the present value of expected future cash flows discounted at the loan’s effective rate, the loan’s observable market price, or the fair value of the collateral, if the loan is collateral dependent. Excluded from the impairment analysis are large groups of smaller balance homogeneous loans such as consumer, home equity line, indirect auto and residential mortgage loans, which are evaluated on a pool basis.
	Loans are charged off in whole or in part when they are considered to be uncollectible. For commercial and agricultural, construction and vacant land and commercial mortgage loans, such evaluations are generally considered for collectability based on borrower financial condition as well as the value of any collateral. For residential mortgage and consumer loans, this evaluation is generally based on past due status as discussed above, as well as an evaluation of borrower creditworthiness and the value of any collateral. Recoveries of amounts previously charged off are recorded as an increase in the allowance for loan and lease losses.
	Significant risk characteristics considered in estimating the allowance for credit losses include the following:
	•	Commercial and agricultural-industry specific economic trends and individual borrower financial condition;
	•	Construction and vacant land, farmland and commercial mortgage loans-type of property (i.e., residential, commercial, industrial) and geographic concentrations and risks and individual borrower financial condition; and
	•	Residential mortgage, indirect auto and consumer-historical charge-offs and current trends in borrower’s credit, property collateral, and loan characteristics.
	The allowance for loan and lease losses associated with PCI loans is comprised of an allowance necessary for certain pools of loans. An allowance related to a PCI loan pool is established when the present value of expected cash flows from the loan pool is less than its recorded investment. The amount of the allowance is equal to the difference between these amounts. In calculating the present value of expected cash flows for this purpose, changes in cash flow estimates pursuant to credit factors are isolated from those related to changes in interest rate indices. Any subsequent improvement in the expected cash flows related to the loan pool results in a reduction of any previously established allowance. Any changes in the allowance, including the initial establishment, are recorded in earnings for the current period as a component of the provision for loan losses.
	Estimates of expected cash flows incorporate assumptions of expected prepayments, probability of default and loss severity given default. Probability of default assumptions are derived from incurred and expected loss data published in third party research reports for commercial, commercial real estate and residential loans. Probability of default assumptions for residential loans are adjusted to incorporate increased risk for historical delinquency occurrence and high loan to collateral value (“LTV”) ratios, and updated borrower credit information. For commercial and commercial real estate loans, probability of default assumptions are based upon loan risk ratings of the Company. Loss severity given default assumptions are developed based upon third party research reports or estimates of current LTV ratios which use real estate price index values for the applicable state or Metropolitan Statistical Area (“MSA”) where available.
	Foreclosed Assets
Assets acquired through, or in lieu of, loan foreclosure or repossession are generally held for sale and are initially recorded at fair value less cost to sell when acquired, establishing a new cost basis. If fair value subsequently declines below the initial recorded value, a valuation allowance is recorded through expense so that the asset is reported at the lower of cost or fair value less cost to sell. If fair value subsequently increases, a reduction of any previous valuation allowance is recorded, which is limited to the total amount of the valuation allowance. Costs incurred after acquisition are generally expensed.
FDIC Indemnification Asset
Pursuant to purchase and assumption agreements with the FDIC, the Bank has entered into loss share agreements in which 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 during the term of the agreement. An indemnification asset is recorded at fair value at the acquisition date. The indemnification asset is recognized at the same time as the indemnified loans, and measured on the same basis, subject to collectability or contractual limitations. The indemnification asset on the acquisition date reflects the present value of future cash flows expected to be received from the FDIC using an appropriate discount rate which reflects counterparty credit risk.
Subsequent to initial recognition, the indemnification asset continues to be measured on the same basis as the related indemnified loans and OREO and is impacted by changes in estimated cash flows associated with these loans and foreclosed properties. Deterioration in expected cash flows of the loans are immediately recorded as an adjustment to the allowance for loan and lease losses and would correspondingly result in an increase in the indemnification asset, with the offset recorded through the consolidated statement of income. Improvements in the cash flows of the loans would first result in a reversal of any existing cumulative impairment and related valuation allowance and a corresponding decrease in the indemnification asset. Subsequent to the full reversal of any such valuation allowance, additional improvement in loan cash flows is reflected as an adjustment to yield that is accreted into income over the remaining term of the loans along with increased amortization of the indemnification asset. Such amortization is recognized over the shorter of a) the remaining term of the loans or b) the life of the shared loss agreements. Loss assumptions used for the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification asset. Fair value accounting incorporates into the fair value of the indemnification asset an element of the time value of money, which is accreted back into income over the life of the loss sharing agreements.
Upon the determination of an incurred loss, the indemnification asset will be reduced by the amount owed by the FDIC. A corresponding claim receivable is recorded until cash is received from the FDIC.
Premises and Equipment
Land is carried on the balance sheet at its cost. Premises and equipment are reported at cost less accumulated depreciation. For financial reporting purposes, premises and equipment are depreciated using the straight-line method over their estimated useful lives. Expenditures for maintenance and repairs are charged to operations as incurred, while major renewals and betterments are capitalized. For Federal income tax reporting purposes, depreciation is computed using primarily accelerated methods.
Goodwill and Other Intangible Assets
Goodwill and other intangible assets (including core deposit base premiums, customer relationship intangibles, and mortgage servicing rights) arising from business purchase combinations are initially recorded at fair value. Goodwill and other intangible assets with indefinite useful lives are not amortized and are tested for impairment at least annually as of the first day of our third quarter, or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Other intangible assets with finite useful lives are amortized over their estimated useful lives to their estimated residual values and tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Other intangible assets are considered to be impaired if the undiscounted cash flows from its associated asset group are less than their recorded net book value; if impairment is determined to exist, the asset must be written down to its fair value based upon discounted cash flows in the period in which impairment is determined to exist. Factors considered in the impairment evaluation include but are not limited to fair market value, general market conditions and projections of future operating results.
In addition, after evaluating the Company’s structure and components, it has been determined that the Company consists of one reporting unit.
Company Owned Life Insurance
The Company owns life insurance policies on certain current and former directors and employees of its subsidiaries. These policies are recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement, if applicable.
Derivative Instruments
The Company has stand-alone derivative financial instruments which it acquired in its’ purchase of Southern Community, primarily in the form of interest rate swaps, foreign exchange contracts, option agreements, and interest rate caps. Additionally, forward loan sales contracts are derived from mortgage loans commitments. These transactions involve both credit and market risk.
The Company does not enter into derivative financial instruments for speculative purposes. None of the derivatives held are 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. Derivatives are recorded at fair value in other assets and other liabilities on the Company’s balance sheet.
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.
Fair Value of Financial Instruments
Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates include uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect these estimates.
Operating Leases
Rent expense for the Company’s operating leases is recorded on a straight-line basis over the initial lease term and those renewal periods that are reasonably assured. It is common for lease agreements to contain various provisions for items such as step rent or other escalation clauses and lease concessions, which may offer a period of no rent payment.
These types of transactions are recorded into expense on a straight line basis over the minimum lease terms. Certain leases require the Company to pay property taxes, insurance and routine maintenance.
Income Taxes
The provision for income taxes is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities between periods. Deferred tax assets and liabilities are measured using the balance sheet method. Under this method, deferred tax asset and liabilities are determined based on differences between the carrying amount of balance sheet items and their corresponding tax values. Changes in the deferred tax assets and liabilities represent decreases and increases in the future tax liability due to reversals of temporary differences and utilization of net operating loss carryforwards and tax credit carryforwards. Current recognition is given to changes in tax rates and laws.
A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of benefit that is greater than 50% likely to be realized upon settlement. For tax positions not meeting the “more likely than not” test, no benefit is recorded. If applicable, accrual of penalties and interest related to an unrecognized tax benefit are recorded in income tax expense.
A valuation allowance related to the deferred tax asset 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. As of December 31, 2014 and 2013, management considered the need for a valuation allowance and based upon its assessment of the evidence available at the time of the analysis, concluded that a valuation allowance was not necessary. In addition, management’s assessment for a valuation allowance includes interpretations of tax laws, lapse of statute of limitations and changes in statutory and regulatory guidance. The Company is no longer subject to federal, state and local examinations by tax authorities for years before 2011.
Loan Commitments and Related Financial Instruments
Loan Commitments and Related Financial instruments include off-balance sheet credit instruments such as commitments to make loans and letters of credit issued to meet customer financing needs. The face amount for these items represents the exposure to loss before considering customer collateral or ability to repay. Such financial instruments are recorded on the balance sheet when they are funded.
Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase
Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized lending and borrowing transactions, respectively, and are recorded at the amounts at which the securities were acquired or sold plus accrued interest. The fair value of collateral either received from or provided to a third party to secure these transactions is regularly monitored and additional collateral is obtained, provided or requested to be returned as appropriate.
Loss Contingencies, Contingent Value Rights and Loss Share Clawback Liabilities
Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Current contingent value rights and FDIC loss clawback liabilities are recorded within accrued expenses and other liabilities and periodically remeasured, with any changes in measurement accounted for as non-interest expense. The balances at December 31, 2014 and 2013 for the contingent value rights was $17.4 million and $15.7 million, respectively. The balance at December 31, 2014 and 2013 for the clawback liability was $1.3 million and $1.0 million, respectively.
Related Party Transaction
Certain of the directors and executive officers of Capital Bank, NA, members of their immediate families and entities with which they are associated are customers of and borrowers from the Bank. As of December 31, 2014 and 2013, total loans outstanding to directors and executive officers of the Bank, and their associates as a group, equaled approximately $13.9 million and $10.9 million, respectively. All outstanding loans and commitments included in such transactions were made in the ordinary course of business, on substantially the same terms, including interest rates and collateral, as those prevailing at the time in comparable transactions with persons not related to the Bank, and did not involve more than the normal risk of collectability or present other unfavorable features.
Operating Segments
While the chief operating decision-makers monitor the revenue streams of the various products and services, the financial services operations are considered by management to be one reportable segment. Operations are managed and financial performance is evaluated on a Company-wide basis.
Recent Accounting Pronouncements
In November 2014, the Financial Accounting Standard Board (the “FASB”) issued Accounting Standards Update ("ASU") 2014-17, “Business Combinations-Pushdown Accounting” (Topic 805)”. The objective of ASU 2014-17 is to provide guidance on whether and at what threshold an acquired entity that is a business or nonprofit activity can apply pushdown accounting in its separate financial statements. The amendments in ASU 2014-17 are effective on November 18, 2014. The adoption of ASU 2014-17 did 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"). This 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 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. 2014-12, “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 is 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 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
In January 2014, the FASB issued ASU 2014-1, “Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force).” ASU 2014-1 allows for use of the proportional amortization method for qualified affordable housing projects if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the income statement as a component of income tax expense. ASU 2014-1 provides for a practical expedient, which allows for amortization of only expected tax credits over the period tax credits are expected to be received. This method is permitted if it produces a measurement that is substantially similar to the measurement that would result from using both tax credits and other tax benefits. ASU 2014-1 is effective for fiscal years and interim periods beginning after December 15, 2014. The adoption of ASU 2014-1 is not expected to 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	12 Months Ended
	Dec. 31, 2014
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)	Years Ended
		31-Dec-14	31-Dec-13	31-Dec-12
	Weighted average number of shares outstanding:
	Basic	48,610	52,614	47,779
	Dilutive effect of options outstanding	533	—	—
	Dilutive effect of unvested restricted shares	726	879	558
	Diluted	49,869	53,493	48,337
	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)	Years Ended
		31-Dec-14	31-Dec-13	31-Dec-12
	Anti-dilutive stock options	11	3,041	2,850
	Anti-dilutive unvested restricted shares	—	—	—

Business_Combinations_and_Acqu

Business Combinations and Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations and Acquisitions	Business Combinations and Acquisitions
	On October 1, 2012, the acquisition of all of the preferred and common share interests of Southern Community was consummated for a total purchase price of $99.3 million in cash. In addition, SCMF shareholders received a contingent value right (“CVR”) which could pay up to $1.30 per share (maximum potential payment of $21.9 million) in cash at the end of a five-year period based on 75% of the savings to the extent that legacy loan and foreclosed asset losses are less than a prescribed amount. As part of the acquisition, the Company purchased from the United States Department of the Treasury (the “Treasury”) all of the outstanding shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series A and related warrants originally issued by SCMF to the Treasury in connection with SCMF’s participation in the Treasury’s Troubled Asset Relief Program (“TARP”). The cash purchase price was approximately $46.9 million which is equal to the outstanding liquidation amount of the preferred stock and is included in the $99.3 million above. Subsequently, SCMF cancelled the Series A Preferred stock. SCMF was the parent of Southern Community Bank and Trust, a bank with 22 branches in Winston-Salem, the Piedmont Triad, and other North Carolina markets.
	The estimated fair values of assets acquired and liabilities assumed in the acquisition of SCMF were based on the information that was available at the time. During the third quarter of 2013, CBF concluded that the underlying asset quality in the SCMF loan portfolio should lead to better credit performance than originally anticipated in our preliminary estimates of fair value. Completion of portfolio due diligence of credit attributes of the acquired loans not initially known but existing at the acquisition date, including assessment of the predecessor institution’s underwriting approach and practices, quality of risk ratings, and borrower credit scores, ultimately resulted in the necessity to revise the original estimate of fair value during the third quarter. As required by the acquisition method of accounting, the Company retrospectively adjusted the acquisition date balance sheet and the results of operations of the fourth quarter of 2012 and first two quarters of 2013 to reflect the following: (1) an increase in the estimated fair value of the loan portfolio; (2) an increase in the associated CVR liability; (3) a decrease in the deferred tax asset related to the increased value of loans; (4) a decrease in goodwill caused by the net effect of these adjustments.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	Trading securities totaled $2.4 million and $6.3 million at December 31, 2014 and December 31, 2013, respectively.
	The amortized cost and estimated fair value of investment securities available-for-sale and held-to-maturity at December 31, 2014 and December 31, 2013, are presented below:
	(Dollars in thousands)		31-Dec-14
			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
	(Dollars in thousands)		December 31, 2013
			Amortized			Unrealized			Unrealized		Estimated
			Cost			Gains			Losses		Fair Value
	Available-for-Sale
	Asset-backed securities		$	133,647		$	363		$	785	$	133,225
	Marketable equity securities		946			—			15		931
	Mortgage-backed securities—residential issued by government sponsored entities		549,869			2,337			5,580		546,626
	Industrial revenue bonds		3,750			109			—		3,859
	Collateralized debt obligations		505			295			—		800
	Total		$	688,717		$	3,104		$	6,380	$	685,441
	Held-to-Maturity
	U.S. Government agencies		$	14,972		$	—		$	401	$	14,571
	State and political subdivisions—tax exempt		14,201			27			129		14,099
	State and political subdivisions—taxable		545			—			12		533
	Mortgage-backed securities—residential issued by government sponsored entities		435,380			328			5,218		430,490
	Total		$	465,098		$	355		$	5,760	$	459,693
	Proceeds from sales of securities were $216.9 million, $2.1 million and $496.3 million for the years ended December 31, 2014, 2013 and 2012, respectively. Gross gains of $1.1 million, $0.2 million and $8.4 million were realized on sales of these investments during the years ended December 31, 2014, 2013 and 2012, respectively.
	During the third quarter of 2013, the Company transferred $511.0 million of available-for-sale securities to held-to-maturity securities, reflecting the Company’s intent and ability to hold those securities to maturity. Transfers of investment securities into the held-to-maturity category from the available-for-sale category are accounted for at fair value at the date of transfer. The related $9.7 million of unrealized holding loss, net of tax, that was included in the transfer is retained in other comprehensive income (loss) and is being amortized as an adjustment to interest income over the remaining life of the securities. There were no gains or losses recognized as a result of this transfer.
	The estimated fair value of investment securities at December 31, 2014, 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-Dec-14
			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		3,580			3,690			2.24	%
	Mortgage-backed securities—residential issued by government sponsored entities		550,908			552,203			1.87	%
	Total		$	554,488		$	555,893		1.87	%
			Amortized			Estimated			Yield
			Cost			Fair Value
	Held-to-maturity
	Due in one year or less		$	205		$	205		0.77	%
	Due after one year through five years		10,814			10,875			4.66	%
	Due after five years through ten years		26,374			26,903			4.48	%
	Due after ten years		15,141			15,398			2.93	%
	Mortgage-backed securities—residential issued by government sponsored entities		384,428			389,998			2.38	%
	Total		$	436,962		$	443,379		2.58	%
	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
			Estimated			Unrealized			Estimated		Unrealized		Estimated		Unrealized
			Fair Value			Losses			Fair Value		Losses		Fair Value		Losses
	31-Dec-14
	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
(Dollars in thousands)		Less than 12 Months						12 Months or Longer				Total
		Estimated			Unrealized			Estimated		Unrealized		Estimated		Unrealized
		Fair Value			Losses			Fair Value		Losses		Fair Value		Losses
December 31, 2013
Available-for-Sale
Asset-backed securities		$	102,835		$	785		$	—	$	—	$	102,835	$	785
Marketable equity securities		931			15			—		—		931		15
Mortgage-backed securities—residential issued by government sponsored entities		339,565			5,580			—		—		339,565		5,580
Total		$	443,331		$	6,380		$	—	$	—	$	443,331	$	6,380
Held-to-Maturity
U.S. Government agencies		$	14,571		$	401		$	—	$	—	$	14,571	$	401
State and political subdivisions—tax exempt		10,489			129			—		—		10,489		129
State and political subdivisions—taxable		533			12			—		—		533		12
Mortgage-backed securities—residential issued by government sponsored entities		342,333			5,218			—		—		342,333		5,218
Total		$	367,926		$	5,760		$	—	$	—	$	367,926	$	5,760
The table below presents a rollforward of the other than temporary impairment credit losses recognized in earnings for the years ended December 31, 2014, 2013 and 2012:
(Dollars in thousands)	Years Ended
	31-Dec-14			31-Dec-13			31-Dec-12
Beginning balance	$	714		$	660		$	616
Additions/subtractions:
Credit losses recognized during the period	—			54			44
Ending balance	$	714		$	714		$	660
The Company owned shares of an investment fund with the principal investment strategy to invest in debt securities and other debt instruments that will cause shares of the fund to be deemed qualified under the Community Reinvestment Act (the “CRA”), so that financial institutions that are subject to the CRA, may receive investment test or similar credit under the CRA with respect to shares of the Fund held by them. The Company evaluated the intent and ability to hold for any anticipated recovery in fair value and the length of time and extent to which the fair value has been less than cost. Based on the extended period the CRA security’s fair value had been less than cost, and market information indicated the prospects for recovery in the near-term were unlikely, the Company determined there to be OTTI during the third quarter of 2013. The Company recognized $54 thousand of impairment loss in earnings, equal to the entire difference between the CRA security’s cost basis and its fair value. The Company sold its shares of the investment on December 18, 2014. Proceeds from the sale were $1.0 million and gross gains were $12 thousand.
At December 31, 2013, the Company owned a collateralized debt obligation ("CDO") collateralized by trust preferred securities issued primarily by banks and several insurance companies. The Company sold its investment in the CDO on January 7, 2014, and based on the sales price, the estimated fair value of the CDO increased by $0.5 million during the year ended December 31, 2013. Since previous credit impairment was recognized, no recovery is allowed under U.S. GAAP. The CDO was recorded at fair value and the remaining unrealized gain was recognized as a component of accumulated other comprehensive income. Proceeds from the sale were $0.8 million and gross gains were $0.3 million, respectively.
As of December 31, 2014, the Company’s security portfolio consisted of 129 securities, 26 of which were in an unrealized loss position. The majority of unrealized losses are related to the Company’s mortgage-backed securities.
All of the mortgage-backed securities at December 31, 2014, and December 31, 2013 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 December 31, 2014 or 2013.
Investment securities having carrying values of approximately $339.0 million and $313.4 million at December 31, 2014 and December 31, 2013, 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	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans	Loans
	Major classifications of loans, including loans held for sale, are as follows:
	(Dollars in thousands)		31-Dec-14				31-Dec-13
	Non-owner occupied commercial real estate		$	798,556			$	775,733
	Other commercial construction and land		200,755				300,494
	Multifamily commercial real estate		89,132				67,688
	1-4 family residential construction and land		68,658				71,351
	Total commercial real estate		1,157,101				1,215,266
	Owner occupied commercial real estate		1,046,736				1,058,148
	Commercial and industrial		1,073,791				803,736
	Lease financing		2,005				2,676
	Total commercial		2,122,532				1,864,560
	1-4 family residential		925,698				804,322
	Home equity loans		378,475				386,366
	Other consumer loans		272,453				170,526
	Total consumer		1,576,626				1,361,214
	Other		143,960				110,989
	Total loans		$	5,000,219			$	4,552,029
	Total loans include $5.5 million and $8.0 million of 1-4 family residential loans held for sale and $10.1 million and $3.8 million of net deferred loan origination costs and fees as of December 31, 2014 and December 31, 2013, 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. As of December 31, 2013, other loans include $49.7 million, $36.2 million and $2.2 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 or PCI Loans”) and (ii) non-PCI loans. Loans originated or purchased by the Company (“New Loans”) and loans acquired through the purchase of CBKN, GRNB, SCMF and 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.
	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 statement of income, unless interest rate driven.
	Additionally, if we have favorable changes in our 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, we 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, we 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)		Years Ended
			31-Dec-14				31-Dec-13				31-Dec-12
	Accretable Yield
	Balance at beginning of period		$	383,775			$	553,348			$	715,479
	New loans purchased		—				—				86,037
	Accretion of income		(119,701		)		(161,867		)		(193,425		)
	Reclassification from nonaccretable difference		71,626				84,203				89,218
	Other		(43,067		)		(91,909		)		(143,961		)
	Balance at end of period		$	292,633			$	383,775			$	553,348
	Nonaccretable difference, balance at the end of the period		$	204,033			$	286,272			$	399,998
	The following table represents the periods we estimate the remaining accretable yield will accrete into income based on the Company’s most recent estimates of cash flows for PCI loans:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	92,714
	2016		65,090
	2017		45,807
	2018		29,787
	2019		19,259
	Thereafter		39,976
	Total		$	292,633
	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 agreement. Refer to Note 10 – 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 December 31, 2014 and December 31, 2013:
	(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
(Dollars in thousands)		Non-PCI Loans
December 31, 2013		New				Acquired				PCI Loans				Total
														Non-covered
														Loans
Non-owner occupied commercial real estate		$	219,482			$	68,080			$	432,437			$	719,999
Other commercial construction and land		67,537				252				213,543				281,332
Multifamily commercial real estate		12,537				16,650				29,392				58,579
1-4 family residential construction and land		56,978				1				14,372				71,351
Total commercial real estate		356,534				84,983				689,744				1,131,261
Owner occupied commercial real estate		642,794				48,459				299,593				990,846
Commercial and industrial loans		643,044				20,519				129,961				793,524
Lease financing		2,676				—				—				2,676
Total commercial		1,288,514				68,978				429,554				1,787,046
1-4 family residential		332,585				52,078				349,060				733,723
Home equity loans		52,918				181,138				100,995				335,051
Other consumer loans		151,584				6,407				12,433				170,424
Total consumer		537,087				239,623				462,488				1,239,198
Other		57,320				3,959				47,888				109,167
Total loans		$	2,239,455			$	397,543			$	1,629,674			$	4,266,672
Covered Loans
The following is a summary of the major categories of covered loans outstanding as of December 31, 2014, and December 31, 2013:
(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
(Dollars in thousands)		Non-PCI Loans
December 31, 2013		New				Acquired				PCI Loans				Total Covered
														Loans
Non-owner occupied commercial real estate		$	—			$	—			$	55,734			$	55,734
Other commercial construction and land		—				—				19,162				19,162
Multifamily commercial real estate		—				—				9,109				9,109
1-4 family residential construction and land		—				—				—				—
Total commercial real estate		—				—				84,005				84,005
Owner occupied commercial real estate		—				—				67,302				67,302
Commercial and industrial loans		—				356				9,856				10,212
Lease financing		—				—				—				—
Total commercial		—				356				77,158				77,514
1-4 family residential		—				1,017				69,582				70,599
Home equity loans		—				36,114				15,201				51,315
Other consumer loans		—				—				102				102
Total consumer		—				37,131				84,885				122,016
Other		—				—				1,822				1,822
Total loans		$	—			$	37,487			$	247,870			$	285,357
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
The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of December 31, 2013:
(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	$	—			$	—			$	—			$	—		$	90	$	—	$	90
Other commercial construction and land	—				—				—				—			563		—		563
Multifamily commercial real estate	305				—				—				—			—		—		305
1-4 family residential construction and land	—				—				—				—			1		—		1
Total commercial real estate	305				—				—				—			654		—		959
Owner occupied commercial real estate	20				—				—				—			3,394		—		3,414
Commercial and industrial loans	2				—				—				—			1,879		66		1,947
Lease financing	—				—				—				—			—		—		—
Total commercial	22				—				—				—			5,273		66		5,361
1-4 family residential	862				—				—				—			1,417		—		2,279
Home equity loans	1,046				146				—				—			2,324		1,270		4,786
Other consumer loans	1,800				—				—				—			806		—		2,606
Total consumer	3,708				146				—				—			4,547		1,270		9,671
Total loans	$	4,035			$	146			$	—			$	—		$	10,474	$	1,336	$	15,991
(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	$	1,463			$	107			$	35,563			$	10,658		$	—	$	—	$	47,791
Other commercial construction and land	1,105				—				58,633				8,479			—		—		68,217
Multifamily commercial real estate	—				—				2,641				—			—		—		2,641
1-4 family residential construction and land	5				—				1,796				—			—		—		1,801
Total commercial real estate	2,573				107				98,633				19,137			—		—		120,450
Owner occupied commercial real estate	4,626				260				33,974				6,631			—		—		45,491
Commercial and industrial loans	249				—				29,819				1,597			—		—		31,665
Lease financing	—				—				—				—			—		—		—
Total commercial	4,875				260				63,793				8,228			—		—		77,156
1-4 family residential	6,696				227				37,646				10,824			—		—		55,393
Home equity loans	1,733				59				7,313				1,227			—		—		10,332
Other consumer loans	344				—				1,249				67			—		—		1,660
Total consumer	8,773				286				46,208				12,118			—		—		67,385
Other	433				—				4,745				954			—		—		6,132
Total loans	$	16,654			$	653			$	213,379			$	40,437		$	—	$	—	$	271,123
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 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
The following table summarizes loans, excluding PCI loans by internal rating at December 31, 2013:
									Substandard
(Dollars in thousands)	Pass				Special Mention				Accruing/				Non-accrual			Doubtful		Total
									Accreting
Non-owner occupied commercial real estate	$	285,919			$	568			$	985			$	90		$	—	$	287,562
Other commercial construction and land	67,178				48				—				563			—		67,789
Multifamily commercial real estate	28,882				—				305				—			—		29,187
1-4 family residential construction and land	53,224				1,958				1,796				1			—		56,979
Total commercial real estate	435,203				2,574				3,086				654			—		441,517
Owner occupied commercial real estate	681,571				4,093				2,195				3,394			—		691,253
Commercial and industrial loans	651,585				1,183				9,206				1,945			—		663,919
Lease financing	2,676				—				—				—			—		2,676
Total commercial	1,335,832				5,276				11,401				5,339			—		1,357,848
1-4 family residential	384,235				28				—				1,417			—		385,680
Home equity loans	263,490				37				3,050				3,593			—		270,170
Other consumer loans	157,157				—				28				806			—		157,991
Total consumer	804,882				65				3,078				5,816			—		813,841
Other	61,006				—				273				—			—		61,279
Total loans	$	2,636,923			$	7,915			$	17,838			$	11,809		$	—	$	2,674,485

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan and Lease Losses
	Activity in the allowance for loan and lease losses for the years ended December 31, 2014, 2013 and 2012 is as follows:
	(Dollars in thousands)		Years Ended
			31-Dec-14				31-Dec-13				31-Dec-12
	Balance, beginning of period		$	56,851			$	57,262			$	34,749
	Provision (reversal) for loan losses for PCI loans		(9,044		)		(1,923		)		13,462
	Provision for loan losses for non-PCI loans		8,455				16,041				11,029
	Non-PCI loans charged-off		(9,202		)		(18,723		)		(5,744		)
	Recoveries of non-PCI loans previously charged-off		3,151				4,194				3,766
	Balance, end of period		$	50,211			$	56,851			$	57,262
	The following tables present the roll forward of the allowance for loan and lease losses for the year ended December 31, 2014 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2013				Provision/				Net(Charge-offs)/				31-Dec-14
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	4,635			$	(2,620	)		$	7			$	2,022
	Other commercial construction and land		8,217				4,088				(124		)		12,181
	Multifamily commercial real estate		320				(68		)		—				252
	1-4 family residential construction and land		1,558				(459		)		3				1,102
	Total commercial real estate		14,730				941				(114		)		15,557
	Owner occupied commercial real estate		4,450				(1,767		)		(179		)		2,504
	Commercial and industrial loans		8,310				758				434				9,502
	Lease financing		3				(3		)		—				—
	Total commercial		12,763				(1,012		)		255				12,006
	1-4 family residential		21,724				(6,245		)		(28		)		15,451
	Home equity loans		3,869				466				(1,520		)		2,815
	Other consumer loans		2,682				4,531				(3,091		)		4,122
	Total consumer		28,275				(1,248		)		(4,639		)		22,388
	Other		1,083				730				(1,553		)		260
	Total loans		$	56,851			$	(589	)		$	(6,051	)		$	50,211
	The following tables present the roll forward of the allowance for loan and lease losses for the year ended December 31, 2013 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		31-Dec-12				Provision/				Net (Charge-offs)/				31-Dec-13
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	3,764			$	1,305			$	(434	)		$	4,635
	Other commercial construction and land		12,711				(5,593		)		1,099				8,217
	Multifamily commercial real estate		348				(69		)		41				320
	1-4 family residential construction and land		1,716				(186		)		28				1,558
	Total commercial real estate		18,539				(4,543		)		734				14,730
	Owner occupied commercial real estate		4,055				1,169				(774		)		4,450
	Commercial and industrial loans		7,490				10,124				(9,304		)		8,310
	Lease financing		—				3				—				3
	Total commercial		11,545				11,296				(10,078		)		12,763
	1-4 family residential		15,740				5,896				88				21,724
	Home equity loans		8,670				(3,559		)		(1,242		)		3,869
	Other consumer loans		2,082				3,029				(2,429		)		2,682
	Total consumer		26,492				5,366				(3,583		)		28,275
	Other		686				1,999				(1,602		)		1,083
	Total loans		$	57,262			$	14,118			$	(14,529	)		$	56,851
	The following tables present the roll forward of the allowance for loan and lease losses for the year ended December 31, 2012 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		31-Dec-11				Provision/				Net (Charge-offs)/				31-Dec-12
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	3,854			$	(964	)		$	874			$	3,764
	Other commercial construction and land		7,627				4,625				459				12,711
	Multifamily commercial real estate		398				(56		)		6				348
	1-4 family residential construction and land		921				810				(15		)		1,716
	Total commercial real estate		12,800				4,415				1,324				18,539
	Owner occupied commercial real estate		5,454				(1,778		)		379				4,055
	Commercial and industrial loans		4,166				3,397				(73		)		7,490
	Lease financing		—				—				—				—
	Total commercial		9,620				1,619				306				11,545
	1-4 family residential		7,252				8,441				47				15,740
	Home equity loans		2,711				7,605				(1,646		)		8,670
	Other consumer loans		1,594				1,740				(1,252		)		2,082
	Total consumer		11,557				17,786				(2,851		)		26,492
	Other		772				671				(757		)		686
	Total loans		$	34,749			$	24,491			$	(1,978	)		$	57,262
The following tables present the roll forward of the allowance for loan and lease losses for PCI and non-PCI loans for the years ended December 31, 2014, 2013 and 2012, by the class of loans against which the allowance is allocated:
(Dollars in thousands)	Year Ended
	31-Dec-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	(293		)		—				(293		)
Other commercial construction and land	(224		)		—				(224		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	(6		)		—				(6		)
Total commercial real estate	(523		)		—				(523		)
Owner occupied commercial real estate	(211		)		—				(211		)
Commercial and industrial loans	(504		)		—				(504		)
Lease financing	—				—				—
Total commercial	(715		)		—				(715		)
1-4 family residential	(114		)		—				(114		)
Home equity loans	(1,740		)		—				(1,740		)
Other consumer loans	(3,745		)		—				(3,745		)
Total consumer	(5,599		)		—				(5,599		)
Other	(2,365		)		—				(2,365		)
Total charge-offs	(9,202		)		—				(9,202		)
Recoveries:
Non-owner occupied commercial real estate	300				—				300
Other commercial construction and land	100				—				100
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	9				—				9
Total commercial real estate	409				—				409
Owner occupied commercial real estate	32				—				32
Commercial and industrial loans	938				—				938
Lease financing	—				—				—
Total commercial	970				—				970
1-4 family residential	86				—				86
Home equity loans	220				—				220
Other consumer loans	654				—				654
Total consumer	960				—				960
Other	812				—				812
Total recoveries	3,151				—				3,151
Net charge-offs	(6,051		)		—				(6,051		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	(59		)		(2,561		)		(2,620		)
Other commercial construction and land	334				3,754				4,088
Multifamily commercial real estate	10				(78		)		(68		)
1-4 family residential construction and land	(329		)		(130		)		(459		)
Total commercial real estate	(44		)		985				941
Owner occupied commercial real estate	(303		)		(1,464		)		(1,767		)
Commercial and industrial loans	431				327				758
Lease financing	(3		)		—				(3		)
Total commercial	125				(1,137		)		(1,012		)
1-4 family residential	589				(6,834		)		(6,245		)
Home equity loans	1,761				(1,295		)		466
Other consumer loans	4,603				(72		)		4,531
Total consumer	6,953				(8,201		)		(1,248		)
Other	1,421				(691		)		730
Total provision (reversal) for loan and lease losses	8,455				(9,044		)		(589		)
Allowance for loan and lease losses at the end of the period	$	21,355			$	28,856			$	50,211
(Dollars in thousands)	Year Ended
	31-Dec-13
	Non-PCI				PCI				Total
Allowance for loan and lease losses at the beginning of the period	$	17,439			$	39,823			$	57,262
Charge-offs:
Non-owner occupied commercial real estate	(92		)		—				(92		)
Other commercial construction and land	(152		)		—				(152		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	—				—				—
Total commercial real estate	(244		)		—				(244		)
Owner occupied commercial real estate	(1,060		)		—				(1,060		)
Commercial and industrial loans	(10,123		)		—				(10,123		)
Lease financing	—				—				—
Total commercial	(11,183		)		—				(11,183		)
1-4 family residential	(40		)		—				(40		)
Home equity loans	(1,630		)		—				(1,630		)
Other consumer loans	(2,999		)		—				(2,999		)
Total consumer	(4,669		)		—				(4,669		)
Other	(2,627		)		—				(2,627		)
Total charge-offs	(18,723		)		—				(18,723		)
Recoveries:
Non-owner occupied commercial real estate	(342		)		—				(342		)
Other commercial construction and land	1,251				—				1,251
Multifamily commercial real estate	41				—				41
1-4 family residential construction and land	28				—				28
Total commercial real estate	978				—				978
Owner occupied commercial real estate	286				—				286
Commercial and industrial loans	819				—				819
Lease financing	—				—				—
Total commercial	1,105				—				1,105
1-4 family residential	128				—				128
Home equity loans	388				—				388
Other consumer loans	570				—				570
Total consumer	1,086				—				1,086
Other	1,025				—				1,025
Total recoveries	4,194				—				4,194
Net charge-offs	(14,529		)		—				(14,529		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	588				717				1,305
Other commercial construction and land	(1,708		)		(3,885		)		(5,593		)
Multifamily commercial real estate	(53		)		(16		)		(69		)
1-4 family residential construction and land	93				(279		)		(186		)
Total commercial real estate	(1,080		)		(3,463		)		(4,543		)
Owner occupied commercial real estate	442				727				1,169
Commercial and industrial loans	10,262				(138		)		10,124
Lease financing	3				—				3
Total commercial	10,707				589				11,296
1-4 family residential	277				5,619				5,896
Home equity loans	1,264				(4,823		)		(3,559		)
Other consumer loans	3,179				(150		)		3,029
Total consumer	4,720				646				5,366
Other	1,694				305				1,999
Total provision (reversal) for loan and lease losses	16,041				(1,923		)		14,118
Allowance for loan and lease losses at the end of the period	$	18,951			$	37,900			$	56,851
(Dollars in thousands)	Year Ended
	31-Dec-12
	Non-PCI				PCI				Total
Allowance for loan and lease losses at the beginning of the period	$	8,388			$	26,361			$	34,749
Charge-offs:
Non-owner occupied commercial real estate	(219		)		—				(219		)
Other commercial construction and land	(83		)		—				(83		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	—				—				—
Total commercial real estate	(302		)		—				(302		)
Owner occupied commercial real estate	(50		)		—				(50		)
Commercial and industrial loans	(371		)		—				(371		)
Lease financing	—				—				—
Total commercial	(421		)		—				(421		)
1-4 family residential	(1,722		)		—				(1,722		)
Home equity loans	(1,511		)		—				(1,511		)
Other consumer loans	—				—				—
Total consumer	(3,233		)		—				(3,233		)
Other	(1,788		)		—				(1,788		)
Total charge-offs	(5,744		)		—				(5,744		)
Recoveries:
Non-owner occupied commercial real estate	1,093				—				1,093
Other commercial construction and land	542				—				542
Multifamily commercial real estate	6				—				6
1-4 family residential construction and land	(15		)		—				(15		)
Total commercial real estate	1,626				—				1,626
Owner occupied commercial real estate	429				—				429
Commercial and industrial loans	298				—				298
Lease financing	—				—				—
Total commercial	727				—				727
1-4 family residential	47				—				47
Home equity loans	76				—				76
Other consumer loans	259				—				259
Total consumer	382				—				382
Other	1,031				—				1,031
Total recoveries	3,766				—				3,766
Net charge-offs	(1,978		)		—				(1,978		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	179				(1,143		)		(964		)
Other commercial construction and land	842				3,783				4,625
Multifamily commercial real estate	115				(171		)		(56		)
1-4 family residential construction and land	514				296				810
Total commercial real estate	1,650				2,765				4,415
Owner occupied commercial real estate	(421		)		(1,357		)		(1,778		)
Commercial and industrial loans	4,040				(643		)		3,397
Lease financing	—				—				—
Total commercial	3,619				(2,000		)		1,619
1-4 family residential	1,001				7,440				8,441
Home equity loans	1,859				5,746				7,605
Other consumer loans	1,823				(83		)		1,740
Total consumer	4,683				13,103				17,786
Other	1,077				(406		)		671
Total provision (reversal) for loan and lease losses	11,029				13,462				24,491
Allowance for loan and lease losses at the end of the period	$	17,439			$	39,823			$	57,262
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.
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, 2013:
(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	$	—			$	1,615			$	3,020			$	877		$	286,685	$	488,171
Other commercial construction and land	—				1,201				7,016				—			67,789		232,705
Multifamily commercial real estate	—				116				204				—			29,187		38,501
1-4 family residential construction and land	—				1,065				493				—			56,979		14,372
Total commercial real estate	—				3,997				10,733				877			440,640		773,749
Owner occupied commercial real estate	—				2,611				1,839				4,844			686,409		366,895
Commercial and industrial loans	507				6,370				1,433				9,623			654,296		139,817
Lease financing	—				3				—				—			2,676		—
Total commercial	507				8,984				3,272				14,467			1,343,381		506,712
1-4 family residential	—				2,279				19,445				—			377,668		418,642
Home equity loans	—				398				3,471				—			270,170		116,196
Other consumer loans	5				2,313				364				207			157,784		12,535
Total consumer	5				4,990				23,280				207			805,622		547,373
Other	—				468				615				273			61,006		49,710
Total loans	$	512			$	18,439			$	37,900			$	15,824		$	2,650,649	$	1,877,544
-1	Loans collectively evaluated for impairment include $435.0 million of acquired loans which are presented net of unamortized purchase discounts of $14.7 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 year ended December 31, 2014 and 2013, 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 December 31, 2014 and 2013. The Company had loans modified in TDRs with recorded investments of $3.8 million and $1.2 million for the years ended December 31, 2014 and 2013, respectively.

FDIC_Indemnification_Asset

FDIC Indemnification Asset	12 Months Ended
	Dec. 31, 2014
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, 2011	$	66,282
	Indemnification asset income	10,728
	Amortization of indemnification asset	(9,403		)
	Cash received on reimbursable losses	(18,190		)
	Balance, December 31, 2012	49,417
	Indemnification asset income	2,245
	Amortization of indemnification asset	(7,901		)
	Cash received on reimbursable losses	(10,151		)
	Balance, December 31, 2013	33,610
	Indemnification asset expense	(2,066		)
	Amortization of indemnification asset	(9,465		)
	Cash received on reimbursable losses	(5,317		)
	Balance, December 31, 2014	$	16,762

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment
	The following is a summary of the cost and accumulated depreciation of premises and equipment:
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			Estimated Useful Life
	Land	$	50,690		$	49,219
	Buildings and leasehold improvements	122,204			124,312			<1 to 40 years
	Furniture, fixture and equipment	70,693			65,605			<1 to 40 years
	Construction in progress	1,827			564
	Premises and equipment, gross	245,414			239,700
	Less: Accumulated depreciation	(72,238		)	(59,845		)
	Premises and equipment, net	$	173,176		$	179,855
	Depreciation expense for the years ended December 31, 2014, 2013 and 2012 was $13.4 million, $14.6 million and $13.1 million, respectively.
	The Company is obligated under operating leases for office and banking premises which expire in periods varying from six months to eighteen years. Rent expense for the years ended December 31, 2014, 2013 and 2012 was $9.6 million, $10.3 million and $9.4 million, respectively. Future minimum lease payments, before considering renewal options that generally are present, are as follows at December 31, 2014:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	8,267
	2016		7,586
	2017		6,458
	2018		5,555
	2019		4,745
	Thereafter		20,253
	Total		$	52,864

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets
	Changes in goodwill during the years ended December 31, 2014, 2013 and 2012 consist of the following:
	(Dollars in thousands)
	Balance, December 31, 2011	$	115,960
	Goodwill associated with the acquisition of SCMF	16,027
	Balance, December 31, 2012	131,987
	Balance, December 31, 2013	131,987
	Out of period adjustment goodwill associated with GRNB	2,535
	Balance, December 31, 2014	$	134,522
	Goodwill is tested for impairment at least annually or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. The Company completed its annual goodwill impairment test as of the first day of our third quarter in 2014, by performing a qualitative assessment of goodwill at the reporting unit level to determine whether any indicators of impairment existed. In performing this qualitative assessment, the Company evaluated events and circumstances since the date of the last quantitative impairment test including the results of that test, macroeconomic conditions, banking industry and market conditions, key financial metrics and overall financial performance of the Company. After assessing the totality of the events and circumstances, the Company determined that it was not more likely than not that the fair value of its reporting unit was less than its carrying amount and, therefore, the first and second steps of the quantitative goodwill impairment test were deemed unnecessary. As of December 31, 2014, we are not aware of any items or events that would cause a further adjustment to the carrying value of goodwill.
	Changes in intangible assets during the years ended December 31, 2014, 2013 and 2012 are presented below:
	(Dollars in thousands)	Core Deposit			Trade Name			Customer Relationship			Mortgage Service Rights
	Balance, December 31, 2011	$	25,649		$	464		$	191		$	388
	Increase associated with acquisition of SCMF	6,860			—			—			—
	Increase associated with Trademark	—			100			—			—
	Impairment of wealth management intangible	—			(33		)	(169		)	—
	Amortization	(4,466		)	(213		)	(22		)	(113		)
	Balance, December 31, 2012	28,043			318			—			275
	Amortization	(4,992		)	(201		)	—			(78		)
	Balance, December 31, 2013	23,051			117			—			197
	Amortization	(4,390		)	(17		)	—			(61		)
	Balance, December 31, 2014	$	18,661		$	100		$	—		$	136
	All of the identified intangible assets are amortized as noninterest expense over their estimated useful lives which range from two to eight years, except for a trademark of $100 thousand with an indefinite useful life. Impairment of the customer relationship intangible asset of $0.2 million and the wealth management trade name intangible asset of $33 thousand were recorded in 2012. No intangibles associated with the customer intangible remains at December 31, 2014.
	Estimated intangible asset amortization expense for each of the next five years is as follows:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	3,806
	2016		3,733
	2017		3,667
	2018		3,604
	2019		2,763
	Thereafter		1,224
	Total		$	18,797

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Other Real Estate Owned	Other Real Estate Owned
	The activity within Other Real Estate Owned (“OREO”) for the years ended December 31, 2014, 2013 and 2012 is presented in the table below. Ending balances for OREO covered by loss sharing agreements with the FDIC for these periods were $15.7 million, $25.3 million and $35.9 million, respectively. Non-covered OREO ending balances for these periods were $61.9 million, $104.1 million and $118.2 million, respectively.
	For the year ended December 31, 2014, proceeds on sales of OREO were $80.4 million and net gains on sales were $4.6 million. For the year ended December 31, 2013, proceeds on sales of OREO were $75.5 million and net gains were $3.5 million. For the year ended December 31, 2012, proceeds on sales of OREO were $100.7 million and net gains were $3.8 million.
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			31-Dec-12
	Balance, beginning of period	$	129,396		$	154,093		$	168,781
	OREO acquired through acquisitions	—			—			20,183
	Real estate acquired from borrowers	34,970			69,403			84,556
	Valuation allowance	(10,901		)	(22,034		)	(22,498		)
	Properties sold	(75,839		)	(72,066		)	(96,929		)
	Balance, end of period	$	77,626		$	129,396		$	154,093

Time_Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Time Deposits	Time Deposits
	Time deposits of $100 thousand or more at December 31, 2014 and 2013 were $592.1 million and $657.8 million, respectively.
	At December 31, 2014, the scheduled contractual maturities of time deposits are as follows:
	(Dollars in thousands)
	Years ending December 31,
	2015	$	785,398
	2016	255,069
	2017	258,163
	2018	40,301
	2019	77,959
	Thereafter	27
	Subtotal	1,416,917
	Unamortized purchase accounting fair value premium	1,783
	Total	$	1,418,700

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances and Short-Term Borrowings	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [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 December 31, 2014 and 2013 were $23.4 million and $24.9 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 December 31, 2014 and 2013 provided for incremental borrowing availability of up to $247.7 million and $95.4 million, respectively.
	At December 31, 2014 and 2013, the Bank had $25.7 million and $25.6 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 December 31, 2014 and 2013 consisted of the following:
	(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.
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Dec-13		Maturity Date	Fixed Contractual Rate
	$	95,000	May 16, 2014	0.36%
	724		November 6, 2017	0.50%
	554		February 10, 2026	—%
	$	96,278

LongTerm_Borrowings

Long-Term Borrowings	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term Borrowings
	Structured repurchase agreements
	The repurchase agreements as of December 31, 2014 and 2013 consisted of the following:
	(Dollars in thousands)
	Carrying Amount
	31-Dec-14				31-Dec-13				Contractual Amount				Maturity Date	Contractual Rate
	$	10,540			$	10,823			$	10,000			November 6, 2016	4.75%
	10,582				10,833				10,000				March 30, 2017	4.50%
	10,394				10,521				10,000				December 18, 2017	3.79%
	10,372				10,492				10,000				December 18, 2017	3.72%
	10,638				10,780				10,000				March 22, 2019	3.56%
	$	52,526			$	53,449			$	50,000
	These repurchase agreements have a weighted-average rate of 4.06% at December 31, 2014 and 2013 and are collateralized by $61.4 million and $62.1 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. On March 18, 2013, the Company called and redeemed $34.5 million of trust preferred securities issued by SCMF, which had a fixed interest rate of 7.95%. The prepayment resulted in a $0.3 million loss on extinguishment of debt. On September 7, 2013 the Company called and redeemed $8.0 million of trust preferred securities issued by TIBB, which had a fixed interest rate of 10.60% The prepayment resulted in a $0.4 million gain on extinguishment of debt.
	The subordinated debentures as of December 31, 2014 and 2013 consisted of the following:
	(Dollars in thousands)
							Carrying Amount
	Date of Offering		Face Amount				31-Dec-14				31-Dec-13			Interest Rate as of December 31, 2014			Maturity Date
	July 31, 2001		$	5,000			$	3,900			$	3,851		3.81	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	July 31, 2001		4,000				2,699				2,636			3.81	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	June 26, 2003		10,000				6,017				5,921			3.35	%	(3 Month LIBOR + 310 bps)	June 26, 2033
	September 25, 2003		10,000				6,516				6,368			3.08	%	(3 Month LIBOR + 285 bps)	October 8, 2033
	December 30, 2003		10,000				5,802				5,704			3.08	%	(3 Month LIBOR + 285 bps)	December 30, 2033
	June 28, 2005		3,000				1,594				1,545			1.92	%	(3 Month LIBOR + 168 bps)	June 28, 2035
	December 22, 2005		10,000				4,607				4,491			1.64	%	(3 Month LIBOR + 140 bps)	March 15, 2036
	December 28, 2005		13,000				6,668				6,458			1.78	%	(3 Month LIBOR + 154 bps)	March 15, 2036
	June 23, 2006		20,000				11,488				11,206			1.78	%	(3 Month LIBOR + 155 bps)	July 7, 2036
	May 16, 2007		56,000				28,904				28,050			1.89	%	(3 Month LIBOR + 165 bps)	June 15, 2037
	June 15, 2007		10,000				5,426				5,327			1.67	%	(3 Month LIBOR + 143 bps)	September 6, 2037
			$	151,000			$	83,621			$	81,557
	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 and $3.6 million as of December 31, 2014 and 2013, respectively. The notes may be prepaid at any time after March 18, 2015. The Company has notified the holders that it intends to prepay the notes on April 1, 2015.
	At December 31, 2014, the maturities of long-term borrowings were as follows:
	(Dollars in thousands)		Fixed Rate				Floating Rate				Total
	Due in 2015		$	—			$	—			$	—
	Due in 2016		10,540				—				10,540
	Due in 2017		31,348				—				31,348
	Due in 2018		—				—				—
	Due in 2019		10,638				—				10,638
	Thereafter		3,534				83,621				87,155
	Total		$	56,060			$	83,621			$	139,681

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans
	The Company maintains the Capital Bank 401(k) Plan that covers all employees who are qualified as to age. An employee may contribute from 1% to 90% of eligible pretax salary subject to limitation under the Internal Revenue Code. The Company may make discretionary contributions to employees’ accounts on an annual basis to employees who are employed as of December 31. The amount of the match is determined annually by the Board of Directors and is subject to change. All employee and discretionary matching contributions are 100% vested. Discretionary matching contributions expensed for each of the years ended December 31, 2014, 2013 and 2012 were $0.4 million. During 2013 and 2012 the SCMF and CBKN, GRNB and TIB plans were merged into the Company’s plan.
	Prior to their acquisition by the Company, CBKN, GRNB, SCMF and TIBB maintained certain benefit plans for the benefit of their respective employees and directors. Upon acquisition of the companies, the Company assumed the accrued liabilities associated with these plans. The plans have been terminated and no deferrals were made in 2014 or 2013. The amounts accrued under these plans totaled $6.7 million and $7.5 million as of December 31, 2014 and 2013, respectively. The (income) expense related to the vested benefits was $(0.8) million, $0.4 million and $0.5 million for 2014, 2013 and 2012, respectively.
	In 2013, the Company adopted the Capital Bank Financial Corp. Nonqualified Excess Plan, a nonqualified deferred compensation plan that provides highly compensated employees of the Company, including its executive officers, with the opportunity to elect to defer his or her base salary and performance-based compensation, which upon such election, will be credited to the applicable participant’s deferred compensation account. Each deferred compensation account will be invested in one or more investment funds made available by the Company and selected by the participant. The Company may make discretionary contributions to the individual deferred compensation accounts, with the amount, if any, to be determined annually by the Company. All contributions, both by the participant and the Company, are fully vested at all times. Each deferred compensation account will be paid out in a lump sum upon a participant’s separation from service with the Company, unless another payment event has been elected in a timely manner by the participant. The amount deferred under this plan totaled $0.7 million and $0.2 million as of December 31, 2014 and 2013, respectively. The amounts expensed related to the vested benefits were $0.5 million and $0.2 million for 2014 and 2013, respectively.
	The Company owns life insurance policies which were purchased for former employees and directors covered by salary continuation agreements and director deferred compensation agreements. The cash surrender value of these policies totaled $55.2 million and $53.6 million at December 31, 2014 and 2013. Cash value income (net of related insurance premium expense) related to these policies totaled $1.6 million, $1.6 million and $0.9 million during 2014, 2013 and 2012, respectively.
	The Company also has a non-contributory defined benefit pension plan which was acquired from Southern Community, covering substantially all employees of an acquired bank, The Community Bank. This plan was assumed as part of the purchase of The Community Bank in January 2004. Benefits under the plan are based on length of service and qualifying compensation during the final years of employment. Contributions to the plan are based upon the projected unit credit actuarial funding method to comply with the funding requirements of the Employee Retirement Income Security Act. The plan was frozen effective May 1, 2004. No contribution was required for the years ended December 31, 2014, and 2013 .
	The unfunded status of the plan was $0.2 million at December 31, 2014. The end of year plan assets and benefit obligation were $1.1 million and $1.3 million, respectively at December 31, 2014.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	As of December 31, 2014, 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 years ended December 31, 2014, 2013 and 2012:
	(Dollars in thousands)	Years Ended
		31-Dec-14				31-Dec-13				31-Dec-12
	Stock options	$	764			$	571			$	9,763
	Restricted stock	1,878				4,868				8,918
	Total stock-based compensation expense	$	2,642			$	5,439			$	18,681
	Salaries and employee benefits	$	2,642			$	5,439			$	17,384
	Other expenses	—				—				1,297
	Total stock-based compensation expense	$	2,642			$	5,439			$	18,681
	The tax benefit related to stock-based compensation expense arising from restricted stock awards and non-qualified stock options was $1.0 million, $2.1 million and $7.3 million for the years ended December 31, 2014 , 2013 and 2012, respectively.
	At December 31, 2014. unrecognized stock-based compensation expense was $0.3 million related to stock options and $0.7 million related to restricted stock. The stock-based compensation expense is expected to be recognized over the weighted-average remaining requisite service period of 5 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 year ended December 31, 2014.
	During the year ended December 31, 2013, 264,000 options were granted to employees at an exercise price of $18.00 vesting over average service periods of 2 years. During the year ended December 31, 2012, 631,000 options were granted to employees at an exercise price of $20.00 and 26,000 options were granted at an exercise price ranging from $28.44 to $2,026.00 vesting over an average service period of 6 months.
	The fair value of each option is estimated as of the date of the grant using the Black-Scholes Option Pricing Model. This model requires the input of subjective assumptions that will usually have a significant impact on the fair value estimate. The dividend yield assumption is consistent with management expectations of dividend distributions based upon the Company’s business plan at the date of grant. The risk-free interest rate was developed using the U.S. Treasury yield curve for a period equal to the expected life of the options on the grant date. The expected option life for the current period grants was estimated using the vesting period, the term of the option and estimates of future exercise behavior patterns. The volatility was estimated using a peer group assessment for periods approximating the expected option life. Appropriate weight is attributed to financial theory, according to which the volatility of an institution’s equity should be related to the volatility of its assets and the entity’s financial leverage.
	The following table summarizes the weighted average assumptions used to compute the grant-date fair value of options granted during the years ended December 31, 2013 and 2012 :
		Years Ended
		31-Dec-13		December 31, 2012
	Dividend yield	—%		—%
	Risk-free interest rate	1.00%		0.91%
	Expected option life	5.75 years		5.25 years
	Volatility	37%		45%
	Weighted average grant-date fair value of options granted	$6.52		$8.05
	ASC 718 requires the recognition of stock-based compensation for the number of awards that are ultimately expected to vest. During the years ended December 31, 2014, 2013 and 2012, 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 years ended December 31, 2014, 2013 and 2012 is as follows:
		Years Ended
		December 31, 2014							December 31, 2013							December 31, 2012
	(Shares in thousands)	Shares			Weighted				Shares			Weighted				Shares		Weighted
					Average							Average						Average
					Exercise Price Per Share							Exercise Price						Exercise Price Per Share
												Per Share
	Balance, January 1,	3,124			$	20.5			2,890			$	21.39			2,236		$	20
	Granted	—			—				264			18				657		27.17
	Exercised	—			—				—			—				—		—
	Canceled, expired or forfeited	(13	)		80.99				(30	)		83.28				(3	)	276.34
	Balance, December 31,	3,111			$	20.26			3,124			$	20.5			2,890		$	21.39
	At December 31, 2014, the weighted average remaining contractual life for outstanding stock options was approximately 5.65 years and the aggregate intrinsic value were $21.6 million and $20.5 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 December 31, 2014 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			8.39 years		$	18			122			$	18
	$20.00	2,864			5.43 years		20				2,864			20
	$28.44 - $2,026.00	11			3.28 years		139.44				11			139.44
	$18.00 - $2,026.00	3,111			5.65 years		$	20.26			2,997			$	20.35
	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 year ended December 31, 2014.
	On May 21, 2013, 4,000 restricted stock awards were granted under the 2010 Plan. The fair value of the restricted stock was estimated to be equal to the closing stock price on the grant date.
	On January 12, 2012, 307,000 restricted stock awards were granted under the 2010 Plan. The fair value of each restricted stock awards was estimated as of the date of grant using a Monte Carlo approach based on Geometric Brownian Motion that simulated daily stock prices and the related consecutive 30 day average of the simulated stock price over a period of 10 years. The model projected the Company’s fair value of each vesting tranche of the restricted stock award from the mean or expected value from the 100,000 scenarios used.
	The models described above require the input of subjective assumptions that will usually have a significant impact on the fair value estimate. The following table summarizes the weighted average assumptions used to compute the grant-date fair value of restricted stock awards granted during the years ended December 31, 2013 and 2012:
		Years Ended
		December 31, 2013		December 31, 2012
	Grant date fair value of the Company's common shares	$18.00		$19.84
	Risk-free interest rate	Forward Treasury Curve		Forward Treasury Curve
	Market risk premium	N/A		—%
	Volatility	N/A		45%
	Annual forfeiture estimate	N/A		—%
Weighted average grant-date fair value of options granted	$18.00		$18.01
The risk-free interest rate was developed using the U.S. Treasury yield curve for a period equal to the expected life of the options on the grant date. The volatility assumptions were estimated using a peer group assessment for periods approximating the expected option life. Appropriate weight is attributed to financial theory, according to which the volatility of an institution’s equity should be related to the volatility of its assets and the entity’s financial leverage.
The value of the restricted stock is being amortized on a straight-line basis over the implied service periods.
On April 2, 2014, 405,133 restricted stock awards vested upon achievement of the $25.00 stock price goal. The Company recognized $1.7 million in excess tax benefits related to the vesting of such awards.
The following table summarizes unvested restricted stock activity for the years ended December 31, 2014, 2013 and 2012:
	Years Ended
	December 31, 2014							December 31, 2013							December 31, 2012
(Shares in thousands)	Shares			Weighted				Shares			Weighted				Shares		Weighted
				Average							Average						Average
				Grant-Date							Grant-Date						Grant-Date
				Fair Value							Fair Value						Fair Value
				Per Share							Per Share						Per Share
Balance, January 1,	1,215			$	14.28			1,211			$	14.27			967		$	13.26
Granted	—			—				4			18				307		18.01
Vested or released	(405	)		15.07				—			—				(63	)	17
Canceled, expired or forfeited	—			—				—			—				—		—
Balance, December 31,	810			$	13.89			1,215			$	14.28			1,211		$	14.27
Full Value Stock Awards
On June 5, 2014, 11,880 shares of stock were granted to Directors under the 2013 Plan. The fair value of each stock award was estimated to be equal to the closing stock price on the date of the grant. The Company recognized the $0.3 million fair value of the stock awards in compensation expense on the grant date.

Shareholders_Equity_and_Minimu

Shareholders' Equity and Minimum Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2014
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 risk-based and Total Risk-based ratios. At December 31, 2014 and 2013 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
	December 31, 2014	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%
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	31-Dec-13	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$254,126	≥ 4.0%	$	949,619	14.90%
	Capital Bank, N.A.	$317,562	≥ 5.0%	$254,050	≥ 4.0%	$	849,520	13.40%
	Tier 1 Capital
	(to Risk Weighted Assets)
	CBF Consolidated	N/A	N/A	$192,428	≥ 4.0%	$	949,619	19.70%
	Capital Bank, N.A.	$288,410	≥ 6.0%	$192,273	≥ 4.0%	$	849,520	17.70%
	Total Capital
	(to Risk Weighted Assets)
	CBF Consolidated	N/A	N/A	$384,856	≥ 8.0%	$	1,010,422	21.00%
	Capital Bank, N.A.	$480,683	≥ 10.0%	$384,546	≥ 8.0%	$	910,162	18.90%
	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 December 31, 2014 and 2013, 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 prohibited Capital Bank, NA from paying a dividend to the Company for three years following the acquisition of the Failed Banks and, now that the three-year period elapsed, imposes other restrictions on Capital Bank’s ability to pay dividends, including requiring prior approval from the OCC before any distribution is made. 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. On September 5, 2013 and July 8, 2014, the OCC approved dividends to the Company by its subsidiary Capital Bank N.A., of $105.0 million and $56.0 million, respectively.
	On January 30, 2015, upon Board and regulatory approval, our subsidiary Capital Bank N.A. paid a $199.4 million dividend, which we may use 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 establishes an integrated regulatory capital framework and introduces the “Standardized Approach” for risk weighted assets, which will replace the Basel I risk-based guidance for determining risk-weighted assets as of January 1, 2015 (the date we became subject to the new rules). We do not believe adoption of the final rules and relevant provisions will have a significant impact on our operations.
	Share Repurchases
	During 2013 and 2014, the Company’s Board of Directors authorized stock repurchase plans of up to $200.0 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 year ended December 31, 2014, the Company repurchased $103.2 million, or 4,324,382 common shares at an average price of $23.87 per share. As of December 31, 2014, the Company has repurchased a total of $173.2 million, or 8,085,699 common shares at an average price of $21.42 per share with $26.8 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 statement of changes in shareholders’ equity.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Income tax expense (benefit) for the years ended December 31, 2014, 2013 and 2012 was as follows:
	(Dollars in thousands)		Years Ended
			31-Dec-14			31-Dec-13			31-Dec-12
	Deferred income tax expense (benefit):
	Federal		$	(2,629	)	$	—		$	—
	State		2,024			376			—
			(605		)	376			—
	Deferred income tax expense (benefit):
	Federal		29,291			23,260			(19,373		)
	State		2,005			3,734			(2,169		)
			31,296			26,994			(21,542		)
	Total income tax expense (benefit)		$	30,691		$	27,370		$	(21,542	)
	A reconciliation of income tax computed at applicable Federal statutory income tax rates to total income tax expense reported for the years ended December 31, 2014, 2013 and 2012 is as follows:
	(Dollars in thousands)		Years Ended
			31-Dec-14			31-Dec-13			31-Dec-12
	Income before income taxes		$	81,609		$	66,214		$	33,483
	Income taxes computed at Federal statutory tax rate		28,563			23,175			11,719
	Effect of:
	State taxes (net of federal benefit)		2,720			2,532			1,280
	State statutory rate change		421			1,545			—
	Transactions and legal costs		—			—			615
	Tax-exempt interest income, net		(1,247		)	(681		)	(715		)
	Change in estimate of deductible loan losses		—			—			(33,975		)
	Contingent value right expense (CVR)		597			1,192			—
	Other, net		(363		)	(393		)	(466		)
	Total income tax expense		$	30,691		$	27,370		$	(21,542	)
	The composition of the net deferred tax asset as of December 31, 2014 and 2013 is as follows:
	(Dollars in thousands)
			31-Dec-14			31-Dec-13
	Deferred tax assets:
	Loan basis differences		$	35,590		$	57,279
	Net operating loss and AMT carryforwards		33,937			46,528
	OREO basis differences		43,724			40,807
	Allowance for loan and lease losses		19,151			22,081
	Stock based compensation		10,821			12,828
	Employee compensation and retirement benefits		2,515			2,898
	Goodwill		1,605			1,854
	CD premium		6,888			9,857
	Net unrealized losses on AFS investments securities		3,171			4,736
	Other		3,197			300
	Total deferred tax assets		160,599			199,168
	Deferred tax liabilities:
	FDIC indemnification asset		(6,393		)	(11,702		)
	Borrowings		(12,969		)	(10,243		)
	Depreciation		(1,219		)	(2,579		)
	Deferred loan costs		(5,730		)	(3,375		)
	Other intangibles		(1,595		)	(526		)
	Other		(3,069		)	(3,981		)
	Total gross deferred tax liabilities		(30,975		)	(32,406		)
	Net deferred tax asset		129,624			166,762
	Valuation allowance		—			—
	Net deferred tax asset		$	129,624		$	166,762
	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, management considered the following positive factors:
	1	projections of future operating results which forecast that the Company will continue to recognize pre-tax income on a consolidated basis;
	2	reductions in operating expenses have been achieved as evidenced by continued progress in reducing operating costs and legacy credit expenses; and
	3	the Company expects interest rates to rise in the future, which should have a favorable impact on our net interest income trend and overall return on assets.
	A negative factor that management considered was the severe losses incurred by the acquired institutions as a result of the severe recession and significant decline in real estate values in their local markets. In addition, Section 382 of the Internal Revenue Code limits the ability of the Company to utilize net operating losses and deduct built in losses for income tax purposes. The Company appropriately considers these limitations and has taken them into account in calculating the net deferred tax assets. These factors represent the most significant positive and negative evidence that management considered in concluding that no valuation allowance was necessary at December 31, 2014 and 2013. The Company and its subsidiaries are subject to U.S. federal income tax, as well as income tax of the states of Florida, New York, South and North Carolina and Tennessee.
	During 2013, changes in certain statutory rates were enacted into law, which reduced the Company's expected state income tax rate. As a result, the Company recorded a $1.5 million charge to income tax expense.
	At December 31, 2014 and 2013 the company had $91.1 million and $103.7 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 December 31, 2014 and 2013, the Company had no unrecognized tax benefits and no amounts recorded for uncertain tax positions.

Loan_Commitments_and_Other_Rel

Loan Commitments and Other Related Activity	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Loan Commitments and Other Related Activity	Loan Commitments and Other Related Activity
	Some financial instruments, such as loan commitments, credit lines, letters of credit and overdraft protection, are issued to meet customer financing needs. These are agreements to provide credit or to support the credit of others, as long as conditions established in the contract are met, and usually have expiration dates. Commitments may expire without being used. Off-balance sheet risk of credit losses exists up to the face amount of these instruments, although material losses are not anticipated. The same credit policies are used to make such commitments as are used for loans, including obtaining collateral upon exercise of the commitment.
	The contractual amount of financial instruments with off-balance-sheet risk at December 31, 2014 is as follows :
	(Dollars in thousands)	Fixed Rate		Variable Rate		Total
	Commitments to make loans	$	65,522	$	12,070	$	77,592
	Unfunded commitments under lines of credit	177,687		854,121		1,031,808
	Total	$	243,209	$	866,191	$	1,109,400
	Commitments to make loans are made for periods ranging from 30 days to 90 days. As of December 31, 2014, the fixed rate loan commitments have interest rates ranging from 1.9% to 13.0%, and specific loan maturities ranging from 1 year to 10 years.
	As of December 31, 2014 the Bank was subject to performance letters of credit totaling $32.4 million and financial letters of credit totaling $27.6 million.

Fair_Value

Fair Value	12 Months Ended
	Dec. 31, 2014
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
	Fair values for interest rate swaps, forward loan sales agreements and interest rate caps 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 also 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 December 31, 2014, 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. We consider 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 December 31, 2014, 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 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
	Marketable equity securities		—				—			—				—
	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.
	Assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 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		$	6,348			$	4,477		$	1,871			(1	)	$	—
	Available-for-sale securities:
	Asset-backed securities		133,225				—			133,225						—
	Mortgage-backed securities-residential		546,626				—			546,626						—
	Industrial revenue bonds		3,859				—			—						3,859
	Marketable equity securities		931				—			931				(1	)	—
	Collateralized debt obligations		800				—			800						—
	Available-for-sale securities		$	685,441			$	—		$	681,582					$	3,859
	Gross asset value of derivatives		$	15			$	—		$	15					$	—
	Liabilities
	Gross liability value of derivatives		$	1,330			$	—		$	1,330					$	—
	-1	Transferred from Level 1 to Level 2 due to limited observable market data.
	The tables below present 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 year ended and held at December 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			1
Ending balance, December 31, 2014			$	3,690
The tables below present 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 year ended and held at December 31, 2013:
(Dollars in thousands)		Fair Value Measurement Using Significant
		Unobservable Inputs (Level 3)
		Corporate Bonds				Industrial			Collateralized
						Revenue			Debt
						Bonds			Obligations
Beginning balance, January 1, 2013		$	26			$	3,800		$	297
Included in earnings-gain on sales		199				—			—
Included in other comprehensive income		—				59			503
Sales		(225		)		—			—
Transfer out of Level 3									(800		)	(2	)
Ending balance, December 31, 2013		$	—			$	3,859		$	—
(2) Transferred from Level 3 to Level 2 as a result of recent transaction information.
Quantitative Information about Recurring Level 3 Fair Value Measurements
(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%
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant	Range
		December 31, 2013						Unobservable
								Input
Industrial revenue bonds		$	3,859			Discounted cash flow		Discount rate	3.7%-3.9%
								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 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.
Assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2013 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		$	—			$	—		$	118,579
Other repossessed assets		—				108			—
Impaired loans		—				—			1,332
Other real estate owned measured at fair value as of December 31, 2013 had a carrying amount of $138.4 million, less valuation allowances totaling $19.8 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
		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%
(Dollars in thousands)		Fair Value at				Valuation Technique		Significant Unobservable Input	Range
		December 31, 2013
Other real estate owned		$	118,579			Fair value of property		Appraised value less cost to sell	7%-10%
Impaired loans		1,332				Fair value of collateral		Appraised value less cost to sell	8%
Carrying amount and estimated fair values of financial instruments were as follows:
(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
(Dollars in thousands)		Fair Value Measurement
December 31, 2013		Carrying Value				Estimated			Level 1				Level 2			Level 3
						Fair Value
Financial Assets
Cash and cash equivalents		$	164,441			$	164,441		$	164,441			$	—		$	—
Trading securities		6,348				6,348			4,477				1,871			—
Investment securities available-for-sale		685,441				685,441			—				681,582			3,859
Investment securities held-to-maturity		465,098				459,693			—				459,693			—
Loans, net		4,495,178				4,681,554			—				8,012			4,673,542
FDIC indemnification asset		33,610				33,610			—				—			33,610
Receivable from FDIC		7,624				7,624			—				7,624			—
Other earning assets (1)		44,088				44,088			—				—			44,088
Gross asset value of derivatives		15				15			—				15			—
Total financial assets		$	5,901,843			$	6,082,814		$	168,918			$	1,158,797		$	4,755,099
Financial Liabilities
Non-contractual deposits		$	3,737,566			$	3,737,566		$	—			$	—		$	3,737,566
Contractual deposits		1,447,497				1,448,032			—				—			1,448,032
Federal Home Loan Bank advances		96,278				96,241			—				96,241			—
Short-term borrowings		24,850				24,850			—				24,850			—
Long-term borrowings		53,449				55,861			—				—			55,861
Subordinated debentures		85,112				100,795			—				—			100,795
Gross liability value of derivatives		1,330				1,330			—				1,330			—
Total financial liabilities		$	5,446,082			$	5,464,675		$	—			$	122,421		$	5,342,254
(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_Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments
	The Company had derivative financial instruments acquired in its purchase of SCMF, primarily in the form of interest rate swaps. The forward loan sales contracts are derived from loans held for sale or in the Company’s pipeline. These transactions involve both credit and market risk.
	The Company’s derivative instrument contracts which are recorded in other assets and other liabilities on the Company’s balance sheets consist of the following:
	(Dollars in thousands)	31-Dec-14				December 31, 2013
		Fair Value		Notional		Fair Value		Notional
				Amount				Amount
	Assets
	Interest rate cap contracts (matured in 2014)	$	—	$	—	$	—	$	12,500
	Forward loan sales contracts (maturing in 2015 and 2014, respectively)	4		1,640		15		4,215
	Total assets	$	4	$	1,640	$	15	$	16,715
	Liabilities
	Interest rate swaps associated with certificates of deposits (terminated in 2014)	$	—	$	—	$	1,320	$	25,000
	Forward loan sales contracts (maturing in 2015 and 2014, respectively)	26		7,578		10		3,545
	Total liabilities	$	26	$	7,578	$	1,330	$	28,545
	The Company does not enter into derivative financial instruments for speculative purposes. None of the derivatives held are 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 year ended December 31, 2014, the Company recorded $1.7 million in non-interest income and $118 thousand in non-interest expense as a result of changes in fair value of derivatives. The interest rate swaps associated with certificates of deposit were terminated in September 2014, and, as a result, the Company recognized a $0.3 million loss in non-interest expense.
	For the year ended December 31, 2013, the company recorded $(0.8) million in non-interest income and $0.3 million in non-interest expense as a result of changes in fair value of derivatives.
	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.
	The primary objective for each of these contracts is to minimize risk. Interest rate risk being the primary risk for the interest rate swaps and forward loan sales contracts.

Condensed_Financial_Informatio

Condensed Financial Information about Capital Bank Financial Corp.	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information about Capital Bank Financial Corp.	Condensed Financial Information about Capital Bank Financial Corp.
	The Condensed Balance Sheets as of December 31, 2014 and 2013 and Income Statements and Statement of Cash Flows for the years ended December 31, 2014, 2013 and 2012 for Capital Bank Financial Corp. (parent only) are as follow:
	Condensed Balance Sheets
	(Parent only)
	(Dollars in thousands)	31-Dec-14			31-Dec-13
	Assets
	Cash and due from banks	$	54,780		$	109,939
	Investment in Bank subsidiary	1,107,652			1,100,473
	Investment in other subsidiaries	4,696			4,691
	Note receivable from subsidiary	3,393			3,393
	Other assets	16,213			12,684
	Total Assets	$	1,186,734		$	1,231,180
	Liabilities and Shareholders’ Equity
	Long-term borrowings1	$	91,831		$	89,787
	Accrued expenses and other liabilities	31,329			28,605
	Shareholder's equity	1,063,574			1,112,788
	Total Liabilities and Shareholders’ Equity	$	1,186,734		$	1,231,180
	Condensed Statements of Income
	(Parent only)
		Years Ended
	(Dollars in thousands)	31-Dec-14			31-Dec-13			31-Dec-12
	Operating income
	Interest income	$	515		$	463		$	99
	Dividend income from subsidiary2	56,113			106,023			35
	Legal settlement	—			400			—
	Management fee income	—			—			3,200
	Total operating income	56,628			106,886			3,334
	Operating expense
	Salaries and benefits including stock-based compensation	3,093			5,846			21,233
	Interest expense	5,854			7,061			2,512
	Gains on extinguishment of debt	—			(122		)	—
	Contingent value right expense	1,706			2,833			188
	Other expense	3,131			3,811			3,605
	Total operating expense	13,784			19,429			27,538
	Income (loss) before income tax benefit and equity in undistributed earnings of subsidiaries	42,844			87,457			(24,204		)
	Income tax benefit	4,598			5,998			9,085
	Income (loss) before equity in undistributed earnings of subsidiaries	47,442			93,455			(15,119		)
	Undistributed equity of subsidiaries, net of tax	3,476			(54,611		)	65,610
	Net income	$	50,918		$	38,844		$	50,491
	Condensed Statements of Cash Flows
	(Parent only)
		Years Ended
	(Dollars in thousands)	31-Dec-14			31-Dec-13			31-Dec-12
	Cash flows from operating activities
	Net income	$	50,918		$	38,844		$	50,491
	Equity in income from subsidiaries	(3,476		)	54,287			(65,610		)
	Stock-based compensation expense	2,642			5,439			18,681
	Decrease in net income tax obligation	(2,856		)	(6,002		)	(8,820		)
	Change in other assets	44			153			1,030
	Change in accrued expenses and other liabilities	(807		)	4,535			(8,787		)
	Net cash provided by (used in) operating activities	46,465			97,256			(13,015		)
	Cash flows from investing activities
	Investment in bank subsidiary	—			—			—
	Investment in bank holding company subsidiaries	—			—			(92,879		)
	Net cash used in investing activities	—			—			(92,879		)
	Cash flows from financing activities
	Purchase of treasury stock	(103,227		)	(69,962		)	—
	Repayments of advances from subsidiaries	—			(42,797		)	—
	Excess tax benefit from share-based payment	1,603			—			—
	Cash in lieu of fractional shares	—			(2		)	—
	Net proceeds from issuance of common shares and merger	—			—			89,362
	Net cash (used in) provided by financing activities	(101,624		)	(112,761		)	89,362
	Net decrease in cash and cash equivalents	(55,159		)	(15,505		)	(16,532		)
	Cash and cash equivalents at beginning of period	109,939			125,444			141,976
Cash and cash equivalents at end of period	$	54,780		$	109,939		$	125,444
Supplemental disclosures of non-cash transactions:
Elimination of noncontrolling interest	$	—		$	—		$	79,413
Net acquisition of non-cash liabilities	—			—			(156,942		)
1 Refer to note 13. Long-Term Borrowings for a maturity schedule of long-term borrowings.
2 Refer to note 16. Shareholders' Equity and Minimum Regulatory Capital requirements for dividends to the Company by its subsidiary Capital Bank N.A.

Supplemental_Financial_Data

Supplemental Financial Data	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Financial Data	Supplemental Financial Data
	Components of other expense in excess of 1.0% of total interest and non-interest income are as follows:
		Years Ended
	(Dollars in thousands)	31-Dec-14		31-Dec-13		31-Dec-12
	Amortization of intangibles	$	4,303	$	5,082	$	4,718
	Postage, courier and armored car	3,468		3,845		3,901

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited)
	The following is a summary of unaudited quarterly results for 2014 and 2013:
	(Dollars in thousands)	Year Ended December 31, 2014											Year Ended December 31, 2013
		Fourth			Third			Second		First			Fourth		Third		Second		First
	Condensed income statements:
	Interest and dividend income	$	67,750		$	67,643		$	66,846	$	68,543		$	71,981	$	72,480	$	73,189	$	76,106
	Net interest income	61,351			61,425			60,831		62,453			65,723		65,386		65,352		67,114
	Provision (reversal) for loan losses	(637		)	(1,332		)	1,404		(24		)	3,265		984		4,467		5,402
	Net income	13,836			13,243			12,425		11,414			12,206		11,444		9,429		5,765
	Basic earnings per common shares	$	0.29		$	0.28		$	0.25	$	0.23		$	0.24	$	0.22	$	0.18	$	0.11
	Diluted earnings per common shares	$	0.29		$	0.27		$	0.25	$	0.22		$	0.23	$	0.22	$	0.17	$	0.11

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
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 consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All significant inter-company accounts and transactions have been eliminated in consolidation. The following is a summary of the more significant accounting policies.
	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.
Out of Period Adjustment	During the three months ended March 31, 2014, the Company recorded a correction of an error resulting from the state net operating loss that the Company was not entitled to subsequent to the 2011 Green Bankshares acquisition. The impact of this correction decreased deferred tax assets and increased goodwill by $2.5 million. After evaluating the quantitative and qualitative aspects of this error, the Company concluded that its prior period financial statements were not materially misstated.
Cash and Cash Equivalents	Cash and cash equivalents include cash on hand and highly-liquid items with an original maturity of three months or less including amounts due from banks, federal funds sold, and interest-bearing deposits at the Federal Home Loan Bank (“FHLB”) and the Federal Reserve Bank of Atlanta (“FRB”). Accordingly, the carrying amount of such instruments is considered to be a reasonable estimate of fair value.
Trading Securities	Marketable equity securities are recorded on a trade-date basis and are accounted for based on the securities’ quoted market prices from a national securities exchange. Those purchased with the intention of recognizing short-term profits are classified as and included in trading securities on our balance sheet. Both realized and unrealized gains and losses on trading securities are included in noninterest income.
Investment Securities and Other than Temporary Impairment	Investment securities which may be sold prior to maturity are classified as available-for-sale and are carried at fair value, with unrealized gains and losses reported in other comprehensive income. Other securities such as Federal Home Loan Bank stock are carried at cost and are included in other assets on the balance sheets. Investment securities where the Company has both the intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost.
	Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized using the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are realized on the trade date and determined using the specific identification method based on the amortized cost of the security sold.
	Management regularly reviews each investment security for impairment based on criteria that include the extent to which cost exceeds fair value, the financial health of and specific prospects for the issuer(s) and our ability and intention with regard to holding the security. Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. In determining OTTI under accounting guidance, management considers many factors, including but not limited to: (1) the financial condition and near-term prospects of the issuer, (2) whether the market decline was affected by macroeconomic conditions, and (3) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery.
	The assessment of whether an OTTI exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time. When OTTI is determined to have occurred, the amount of the impairment recognized in earnings depends on whether management intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, less any current-period credit loss. If management intends to sell or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, less any current-period credit loss, the impairment is required to be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If management does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the credit worthiness of the issuer is analyzed to determine if there is a credit component of the unrealized loss that would require recognition in earnings. Impairment identified through this analysis is separated into the amount representing the credit loss and the amount related to all other factors (i.e., changes in market interest rates, liquidity premiums, etc.). The amount of impairment related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized in earnings. The amount of the impairment related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment. Future declines in the fair value of securities may result in impairment charges which may be material to the financial condition and results of operations of the Company.
Loans Held for Sale	Certain residential fixed rate mortgage loans originated by the Company are sold to third parties on a servicing released basis. Certain of these sales are subject to temporary recourse provisions. The recourse provisions may require the repurchase of the outstanding balance of loans which default within a limited period of time subsequent to the sale. The recourse periods vary by investor and extend up to seven months subsequent to the sale of the loan. All origination fees are recognized as income at the time of the sale. Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or market, as determined by outstanding commitments from investors. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings.
Purchased Credit-Impaired Loans	When it is probable that the Company will not collect all contractual cash flows associated with acquired loans, unless specifically exempt, these acquired loans are accounted for under accounting guidance for purchased credit-impaired (“PCI”) loans. Any Allowance for Loan and Lease Losses (“the Allowance”) previously associated with these loans does not carry over to the Company and is eliminated in the purchase accounting adjustments. The fair value of the PCI loans is then assigned based on the present value of estimated future cash flows including prepayments but exclusive of any loss-sharing arrangements. The excess of the gross cash flows expected to be collected over the present value of cash flows at the acquisition date (i.e., the accretable yield) is accreted into income over the estimated remaining term of the PCI loans using the effective yield method, provided that the timing and amount of future cash flows is reasonably estimable. Accordingly, such loans are not classified as nonaccrual as the accretable yield is reported as interest income. The impact of changes in variable interest rates is recognized prospectively as adjustments to the accretable yield.
	For further discussion of the Company’s acquisitions and loan accounting, see Note 3. Business Combinations and Acquisitions and Note 5. Loans, respectively.
New Loans and Acquired Non-PCI Loans	New loans that management has the intent and ability to hold are reported at the principal balance outstanding, net of deferred loan fees and costs, and an allowance for loan and lease losses. Acquired non-PCI loans are initially reported at their acquisition date fair value. Subsequently, acquired non-PCI loans are reported net of amortization or accretion of any applicable acquisition discount or premium and an allowance for loan and lease losses. Interest income on New and non-PCI acquired loans is reported on the interest method and includes amortization of net deferred loan fees, costs and any applicable acquisition discount or premium over the loan term. Amortization of deferred loan fees and costs is based on the contractual lives of the loans and does not include anticipation of prepayments. If the collectability of interest appears doubtful, the loan is classified as nonaccrual.
Nonaccrual Loans	The majority of loans are placed on nonaccrual status when it is probable that principal or interest is not fully collectible, or generally when principal or interest becomes 90 days past due, whichever occurs first. Certain loans past due 90 days or more may remain on accrual status if management determines that it does not have concern over the collectability of principal and interest and such loans are in the process of collection.
	Generally, when loans are placed on nonaccrual status, accrued and unpaid interest receivable is reversed against interest income in the current period. Interest payments received thereafter are generally applied as a reduction to the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans are generally removed from nonaccrual status when they become current as to both principal and interest and concern no longer exists as to the collectability of principal and interest. The Company’s policies related to when loans are placed on nonaccrual status conform to guidelines prescribed by bank regulatory authorities.
Direct Financing Leases	Direct financing leases are carried at the aggregate of lease payments receivable and estimated residual value of the leased property, if applicable, less unearned income. Interest income on direct financing leases is recognized over the term of the leases to achieve a constant periodic rate of return on the outstanding investment. Initial direct costs are deferred and amortized over the lease term as a reduction to interest income using the effective interest method.
Allowance for Loan and Lease Losses	The Company maintains an allowance for loan and lease losses to absorb losses incurred in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable estimated incurred losses inherent in the portfolio of loans held for investment. The allowance is increased by the provision for loan and lease losses, which is charged against current period operating results and decreased by the amount of charge offs, net of recoveries. The Company’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the formulaic allowance and the specific allowance for impaired loans.
	Management develops and documents its systematic methodology for determining the allowance for loan and lease losses by first dividing its portfolio into segments-commercial real estate, commercial, consumer and other. The Company further divides the portfolio segments into classes and subclasses based on initial measurement attributes, risk characteristics or its method of monitoring and assessing credit risk (such as owner occupied commercial real estate, for which the Company believes risk characteristics and cash flows are aligned with the Commercial class).
	The classes and subclasses for the Company are as follows:
	Commercial real estate
	•	Non-owner occupied commercial real estate
	•	Other commercial construction and land
	•	Multifamily commercial real estate
	•	1-4 family residential construction and land
	Commercial
	•	Owner occupied commercial real estate
	•	Commercial and industrial
	•	Lease Financing
	Consumer
	•	1-4 family residential
	•	HELOC
	•	Junior lien
	•	Other consumer loans
	•	Indirect auto
	Other
	•	Farmland
	•	Agriculture
	•	All other loans
	For non-PCI loans, the allowance for loan and lease losses is calculated by applying loss factors to outstanding loans. It is the Company’s policy to use loss factors based on historical loss experience which may be adjusted for significant factors that, in management’s judgment, affect the collectability of the portfolio as of the evaluation date. The Company has limited historical loss experience on newly originated loans and the historical loss information available relating to the portfolios of acquired loans is considered by management to be irrelevant to newly originated loans due to differences in underwriting criteria and loan type. Accordingly, the Company currently is utilizing loss rates from a peer group of comparable banks based on size, portfolio type and geography as the basis for determining loss factors to apply to any outstanding loans. The Company derives the loss factors for all segments from pooled loan loss factors. Such pooled loan loss factors (for loans not individually graded) are based on expected net charge off ranges. Loan loss factors, which are used in determining the allowance, are adjusted quarterly primarily based upon the changes in the level of historical net charge offs and parameter updates by management. Management estimates probable incurred losses in the portfolio based on a historical loss look-back period. The look-back period is representative of management’s consideration of relevant historical loss experience.
	Furthermore, based on management’s judgment, the Company’s methodology permits adjustments to any loss factor used in the computation of the allowance for significant factors, which affect the collectability of the portfolio as of the evaluation date, but are not reflected in the loss factors. By assessing the probable estimated incurred losses in the loan portfolio on a quarterly basis, management is able to adjust specific and inherent loss estimates based upon the most recent information that has become available. This includes changing the number of periods that are included in the calculation of the loss factors and adjusting qualitative factors to be representative of the current economic cycle and other factors impacting the portfolio.
	Generally, for Commercial loans, the Company evaluates individual nonaccrual loans with recorded investment balances greater than or equal to $0.5 million and substandard but accruing loans with recorded investment balances greater than or equal to $1.0 million for impairment. Residential mortgage and consumer loans are generally not individually evaluated for impairment unless they become non-accrual and exceed $0.5 million in recorded investment or represent troubled debt restructuring. Loans are considered impaired when the individual evaluation of current information regarding the borrower’s financial condition, loan collateral, and cash flows indicates that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, including interest payments. Impaired loans are carried at the lower of the recorded investment in the loan, the present value of expected future cash flows discounted at the loan’s effective rate, the loan’s observable market price, or the fair value of the collateral, if the loan is collateral dependent. Excluded from the impairment analysis are large groups of smaller balance homogeneous loans such as consumer, home equity line, indirect auto and residential mortgage loans, which are evaluated on a pool basis.
	Loans are charged off in whole or in part when they are considered to be uncollectible. For commercial and agricultural, construction and vacant land and commercial mortgage loans, such evaluations are generally considered for collectability based on borrower financial condition as well as the value of any collateral. For residential mortgage and consumer loans, this evaluation is generally based on past due status as discussed above, as well as an evaluation of borrower creditworthiness and the value of any collateral. Recoveries of amounts previously charged off are recorded as an increase in the allowance for loan and lease losses.
	Significant risk characteristics considered in estimating the allowance for credit losses include the following:
	•	Commercial and agricultural-industry specific economic trends and individual borrower financial condition;
	•	Construction and vacant land, farmland and commercial mortgage loans-type of property (i.e., residential, commercial, industrial) and geographic concentrations and risks and individual borrower financial condition; and
	•	Residential mortgage, indirect auto and consumer-historical charge-offs and current trends in borrower’s credit, property collateral, and loan characteristics.
	The allowance for loan and lease losses associated with PCI loans is comprised of an allowance necessary for certain pools of loans. An allowance related to a PCI loan pool is established when the present value of expected cash flows from the loan pool is less than its recorded investment. The amount of the allowance is equal to the difference between these amounts. In calculating the present value of expected cash flows for this purpose, changes in cash flow estimates pursuant to credit factors are isolated from those related to changes in interest rate indices. Any subsequent improvement in the expected cash flows related to the loan pool results in a reduction of any previously established allowance. Any changes in the allowance, including the initial establishment, are recorded in earnings for the current period as a component of the provision for loan losses.
	Estimates of expected cash flows incorporate assumptions of expected prepayments, probability of default and loss severity given default. Probability of default assumptions are derived from incurred and expected loss data published in third party research reports for commercial, commercial real estate and residential loans. Probability of default assumptions for residential loans are adjusted to incorporate increased risk for historical delinquency occurrence and high loan to collateral value (“LTV”) ratios, and updated borrower credit information. For commercial and commercial real estate loans, probability of default assumptions are based upon loan risk ratings of the Company. Loss severity given default assumptions are developed based upon third party research reports or estimates of current LTV ratios which use real estate price index values for the applicable state or Metropolitan Statistical Area (“MSA”) where available.
Foreclosed Assets	Assets acquired through, or in lieu of, loan foreclosure or repossession are generally held for sale and are initially recorded at fair value less cost to sell when acquired, establishing a new cost basis. If fair value subsequently declines below the initial recorded value, a valuation allowance is recorded through expense so that the asset is reported at the lower of cost or fair value less cost to sell. If fair value subsequently increases, a reduction of any previous valuation allowance is recorded, which is limited to the total amount of the valuation allowance. Costs incurred after acquisition are generally expensed.
FDIC Indemnification Asset	Pursuant to purchase and assumption agreements with the FDIC, the Bank has entered into loss share agreements in which 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 during the term of the agreement. An indemnification asset is recorded at fair value at the acquisition date. The indemnification asset is recognized at the same time as the indemnified loans, and measured on the same basis, subject to collectability or contractual limitations. The indemnification asset on the acquisition date reflects the present value of future cash flows expected to be received from the FDIC using an appropriate discount rate which reflects counterparty credit risk.
	Subsequent to initial recognition, the indemnification asset continues to be measured on the same basis as the related indemnified loans and OREO and is impacted by changes in estimated cash flows associated with these loans and foreclosed properties. Deterioration in expected cash flows of the loans are immediately recorded as an adjustment to the allowance for loan and lease losses and would correspondingly result in an increase in the indemnification asset, with the offset recorded through the consolidated statement of income. Improvements in the cash flows of the loans would first result in a reversal of any existing cumulative impairment and related valuation allowance and a corresponding decrease in the indemnification asset. Subsequent to the full reversal of any such valuation allowance, additional improvement in loan cash flows is reflected as an adjustment to yield that is accreted into income over the remaining term of the loans along with increased amortization of the indemnification asset. Such amortization is recognized over the shorter of a) the remaining term of the loans or b) the life of the shared loss agreements. Loss assumptions used for the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification asset. Fair value accounting incorporates into the fair value of the indemnification asset an element of the time value of money, which is accreted back into income over the life of the loss sharing agreements.
	Upon the determination of an incurred loss, the indemnification asset will be reduced by the amount owed by the FDIC. A corresponding claim receivable is recorded until cash is received from the FDIC.
Premises and Equipment	Land is carried on the balance sheet at its cost. Premises and equipment are reported at cost less accumulated depreciation. For financial reporting purposes, premises and equipment are depreciated using the straight-line method over their estimated useful lives. Expenditures for maintenance and repairs are charged to operations as incurred, while major renewals and betterments are capitalized. For Federal income tax reporting purposes, depreciation is computed using primarily accelerated methods.
Goodwill and Other Intangible Assets	Goodwill and other intangible assets (including core deposit base premiums, customer relationship intangibles, and mortgage servicing rights) arising from business purchase combinations are initially recorded at fair value. Goodwill and other intangible assets with indefinite useful lives are not amortized and are tested for impairment at least annually as of the first day of our third quarter, or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Other intangible assets with finite useful lives are amortized over their estimated useful lives to their estimated residual values and tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Other intangible assets are considered to be impaired if the undiscounted cash flows from its associated asset group are less than their recorded net book value; if impairment is determined to exist, the asset must be written down to its fair value based upon discounted cash flows in the period in which impairment is determined to exist. Factors considered in the impairment evaluation include but are not limited to fair market value, general market conditions and projections of future operating results.
	In addition, after evaluating the Company’s structure and components, it has been determined that the Company consists of one reporting unit.
Company Owned Life Insurance	The Company owns life insurance policies on certain current and former directors and employees of its subsidiaries. These policies are recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement, if applicable.
Derivative Instruments	The Company has stand-alone derivative financial instruments which it acquired in its’ purchase of Southern Community, primarily in the form of interest rate swaps, foreign exchange contracts, option agreements, and interest rate caps. Additionally, forward loan sales contracts are derived from mortgage loans commitments. These transactions involve both credit and market risk.
	The Company does not enter into derivative financial instruments for speculative purposes. None of the derivatives held are 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. Derivatives are recorded at fair value in other assets and other liabilities on the Company’s balance sheet.
	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.
Fair Value of Financial Instruments	Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates include uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect these estimates.
Operating Leases	Rent expense for the Company’s operating leases is recorded on a straight-line basis over the initial lease term and those renewal periods that are reasonably assured. It is common for lease agreements to contain various provisions for items such as step rent or other escalation clauses and lease concessions, which may offer a period of no rent payment.
	These types of transactions are recorded into expense on a straight line basis over the minimum lease terms. Certain leases require the Company to pay property taxes, insurance and routine maintenance.
Income Taxes	The provision for income taxes is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities between periods. Deferred tax assets and liabilities are measured using the balance sheet method. Under this method, deferred tax asset and liabilities are determined based on differences between the carrying amount of balance sheet items and their corresponding tax values. Changes in the deferred tax assets and liabilities represent decreases and increases in the future tax liability due to reversals of temporary differences and utilization of net operating loss carryforwards and tax credit carryforwards. Current recognition is given to changes in tax rates and laws.
	A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of benefit that is greater than 50% likely to be realized upon settlement. For tax positions not meeting the “more likely than not” test, no benefit is recorded. If applicable, accrual of penalties and interest related to an unrecognized tax benefit are recorded in income tax expense.
	A valuation allowance related to the deferred tax asset 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. As of December 31, 2014 and 2013, management considered the need for a valuation allowance and based upon its assessment of the evidence available at the time of the analysis, concluded that a valuation allowance was not necessary. In addition, management’s assessment for a valuation allowance includes interpretations of tax laws, lapse of statute of limitations and changes in statutory and regulatory guidance. The Company is no longer subject to federal, state and local examinations by tax authorities for years before 2011.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial instruments include off-balance sheet credit instruments such as commitments to make loans and letters of credit issued to meet customer financing needs. The face amount for these items represents the exposure to loss before considering customer collateral or ability to repay. Such financial instruments are recorded on the balance sheet when they are funded.
Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase	Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized lending and borrowing transactions, respectively, and are recorded at the amounts at which the securities were acquired or sold plus accrued interest. The fair value of collateral either received from or provided to a third party to secure these transactions is regularly monitored and additional collateral is obtained, provided or requested to be returned as appropriate.
Loss Contingencies, Contingent Value Rights and Loss Share Clawback Liabilities	Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Current contingent value rights and FDIC loss clawback liabilities are recorded within accrued expenses and other liabilities and periodically remeasured, with any changes in measurement accounted for as non-interest expense.
Related Party Transaction	Certain of the directors and executive officers of Capital Bank, NA, members of their immediate families and entities with which they are associated are customers of and borrowers from the Bank. As of December 31, 2014 and 2013, total loans outstanding to directors and executive officers of the Bank, and their associates as a group, equaled approximately $13.9 million and $10.9 million, respectively. All outstanding loans and commitments included in such transactions were made in the ordinary course of business, on substantially the same terms, including interest rates and collateral, as those prevailing at the time in comparable transactions with persons not related to the Bank, and did not involve more than the normal risk of collectability or present other unfavorable features.
Operating Segments	While the chief operating decision-makers monitor the revenue streams of the various products and services, the financial services operations are considered by management to be one reportable segment. Operations are managed and financial performance is evaluated on a Company-wide basis.
Recent Accounting Pronouncements	In November 2014, the Financial Accounting Standard Board (the “FASB”) issued Accounting Standards Update ("ASU") 2014-17, “Business Combinations-Pushdown Accounting” (Topic 805)”. The objective of ASU 2014-17 is to provide guidance on whether and at what threshold an acquired entity that is a business or nonprofit activity can apply pushdown accounting in its separate financial statements. The amendments in ASU 2014-17 are effective on November 18, 2014. The adoption of ASU 2014-17 did 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"). This 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 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. 2014-12, “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 is 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 is not expected to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In January 2014, the FASB issued ASU 2014-1, “Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force).” ASU 2014-1 allows for use of the proportional amortization method for qualified affordable housing projects if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the income statement as a component of income tax expense. ASU 2014-1 provides for a practical expedient, which allows for amortization of only expected tax credits over the period tax credits are expected to be received. This method is permitted if it produces a measurement that is substantially similar to the measurement that would result from using both tax credits and other tax benefits. ASU 2014-1 is effective for fiscal years and interim periods beginning after December 15, 2014. The adoption of ASU 2014-1 is not expected to 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)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following:
	(Shares in thousands)	Years Ended
		31-Dec-14	31-Dec-13	31-Dec-12
	Weighted average number of shares outstanding:
	Basic	48,610	52,614	47,779
	Dilutive effect of options outstanding	533	—	—
	Dilutive effect of unvested restricted shares	726	879	558
	Diluted	49,869	53,493	48,337
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)	Years Ended
		31-Dec-14	31-Dec-13	31-Dec-12
	Anti-dilutive stock options	11	3,041	2,850
	Anti-dilutive unvested restricted shares	—	—	—

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014 and December 31, 2013, are presented below:
	(Dollars in thousands)		31-Dec-14
			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
	(Dollars in thousands)		December 31, 2013
			Amortized			Unrealized			Unrealized		Estimated
			Cost			Gains			Losses		Fair Value
	Available-for-Sale
	Asset-backed securities		$	133,647		$	363		$	785	$	133,225
	Marketable equity securities		946			—			15		931
	Mortgage-backed securities—residential issued by government sponsored entities		549,869			2,337			5,580		546,626
	Industrial revenue bonds		3,750			109			—		3,859
	Collateralized debt obligations		505			295			—		800
	Total		$	688,717		$	3,104		$	6,380	$	685,441
	Held-to-Maturity
	U.S. Government agencies		$	14,972		$	—		$	401	$	14,571
	State and political subdivisions—tax exempt		14,201			27			129		14,099
	State and political subdivisions—taxable		545			—			12		533
	Mortgage-backed securities—residential issued by government sponsored entities		435,380			328			5,218		430,490
	Total		$	465,098		$	355		$	5,760	$	459,693
Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity by Contractual Maturity	The estimated fair value of investment securities at December 31, 2014, 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-Dec-14
			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		3,580			3,690			2.24	%
	Mortgage-backed securities—residential issued by government sponsored entities		550,908			552,203			1.87	%
	Total		$	554,488		$	555,893		1.87	%
			Amortized			Estimated			Yield
			Cost			Fair Value
	Held-to-maturity
	Due in one year or less		$	205		$	205		0.77	%
	Due after one year through five years		10,814			10,875			4.66	%
	Due after five years through ten years		26,374			26,903			4.48	%
	Due after ten years		15,141			15,398			2.93	%
	Mortgage-backed securities—residential issued by government sponsored entities		384,428			389,998			2.38	%
	Total		$	436,962		$	443,379		2.58	%
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
			Estimated			Unrealized			Estimated		Unrealized		Estimated		Unrealized
			Fair Value			Losses			Fair Value		Losses		Fair Value		Losses
	31-Dec-14
	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
	(Dollars in thousands)		Less than 12 Months						12 Months or Longer				Total
			Estimated			Unrealized			Estimated		Unrealized		Estimated		Unrealized
			Fair Value			Losses			Fair Value		Losses		Fair Value		Losses
	December 31, 2013
	Available-for-Sale
	Asset-backed securities		$	102,835		$	785		$	—	$	—	$	102,835	$	785
	Marketable equity securities		931			15			—		—		931		15
	Mortgage-backed securities—residential issued by government sponsored entities		339,565			5,580			—		—		339,565		5,580
	Total		$	443,331		$	6,380		$	—	$	—	$	443,331	$	6,380
	Held-to-Maturity
	U.S. Government agencies		$	14,571		$	401		$	—	$	—	$	14,571	$	401
	State and political subdivisions—tax exempt		10,489			129			—		—		10,489		129
	State and political subdivisions—taxable		533			12			—		—		533		12
	Mortgage-backed securities—residential issued by government sponsored entities		342,333			5,218			—		—		342,333		5,218
	Total		$	367,926		$	5,760		$	—	$	—	$	367,926	$	5,760
Rollforward of Other Than Temporary Impairment Credit Losses Recognized in Earnings	The table below presents a rollforward of the other than temporary impairment credit losses recognized in earnings for the years ended December 31, 2014, 2013 and 2012:
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			31-Dec-12
	Beginning balance	$	714		$	660		$	616
	Additions/subtractions:
	Credit losses recognized during the period	—			54			44
	Ending balance	$	714		$	714		$	660

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Major Classifications of Loans	Major classifications of loans, including loans held for sale, are as follows:
	(Dollars in thousands)		31-Dec-14				31-Dec-13
	Non-owner occupied commercial real estate		$	798,556			$	775,733
	Other commercial construction and land		200,755				300,494
	Multifamily commercial real estate		89,132				67,688
	1-4 family residential construction and land		68,658				71,351
	Total commercial real estate		1,157,101				1,215,266
	Owner occupied commercial real estate		1,046,736				1,058,148
	Commercial and industrial		1,073,791				803,736
	Lease financing		2,005				2,676
	Total commercial		2,122,532				1,864,560
	1-4 family residential		925,698				804,322
	Home equity loans		378,475				386,366
	Other consumer loans		272,453				170,526
	Total consumer		1,576,626				1,361,214
	Other		143,960				110,989
	Total loans		$	5,000,219			$	4,552,029
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)		Years Ended
			31-Dec-14				31-Dec-13				31-Dec-12
	Accretable Yield
	Balance at beginning of period		$	383,775			$	553,348			$	715,479
	New loans purchased		—				—				86,037
	Accretion of income		(119,701		)		(161,867		)		(193,425		)
	Reclassification from nonaccretable difference		71,626				84,203				89,218
	Other		(43,067		)		(91,909		)		(143,961		)
	Balance at end of period		$	292,633			$	383,775			$	553,348
	Nonaccretable difference, balance at the end of the period		$	204,033			$	286,272			$	399,998
Summary of Company's Estimate of Cash Flows for Purchased Credit-Impaired Loans	The following table represents the periods we estimate the remaining accretable yield will accrete into income based on the Company’s most recent estimates of cash flows for PCI loans:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	92,714
	2016		65,090
	2017		45,807
	2018		29,787
	2019		19,259
	Thereafter		39,976
	Total		$	292,633
Major Categories of Loans	The following is a summary of the major categories of non-covered loans outstanding as of December 31, 2014 and December 31, 2013:
	(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
	(Dollars in thousands)		Non-PCI Loans
	December 31, 2013		New				Acquired				PCI Loans				Total
															Non-covered
															Loans
	Non-owner occupied commercial real estate		$	219,482			$	68,080			$	432,437			$	719,999
	Other commercial construction and land		67,537				252				213,543				281,332
	Multifamily commercial real estate		12,537				16,650				29,392				58,579
	1-4 family residential construction and land		56,978				1				14,372				71,351
	Total commercial real estate		356,534				84,983				689,744				1,131,261
	Owner occupied commercial real estate		642,794				48,459				299,593				990,846
	Commercial and industrial loans		643,044				20,519				129,961				793,524
	Lease financing		2,676				—				—				2,676
	Total commercial		1,288,514				68,978				429,554				1,787,046
	1-4 family residential		332,585				52,078				349,060				733,723
	Home equity loans		52,918				181,138				100,995				335,051
	Other consumer loans		151,584				6,407				12,433				170,424
	Total consumer		537,087				239,623				462,488				1,239,198
	Other		57,320				3,959				47,888				109,167
	Total loans		$	2,239,455			$	397,543			$	1,629,674			$	4,266,672
	Covered Loans
	The following is a summary of the major categories of covered loans outstanding as of December 31, 2014, and December 31, 2013:
	(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
	(Dollars in thousands)		Non-PCI Loans
	December 31, 2013		New				Acquired				PCI Loans				Total Covered
															Loans
	Non-owner occupied commercial real estate		$	—			$	—			$	55,734			$	55,734
Other commercial construction and land		—				—				19,162				19,162
Multifamily commercial real estate		—				—				9,109				9,109
1-4 family residential construction and land		—				—				—				—
Total commercial real estate		—				—				84,005				84,005
Owner occupied commercial real estate		—				—				67,302				67,302
Commercial and industrial loans		—				356				9,856				10,212
Lease financing		—				—				—				—
Total commercial		—				356				77,158				77,514
1-4 family residential		—				1,017				69,582				70,599
Home equity loans		—				36,114				15,201				51,315
Other consumer loans		—				—				102				102
Total consumer		—				37,131				84,885				122,016
Other		—				—				1,822				1,822
Total loans		$	—			$	37,487			$	247,870			$	285,357
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 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
	The following tables present the aging of the recorded investment in past due loans, based on contractual terms, as of December 31, 2013:
	(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	$	—			$	—			$	—			$	—		$	90	$	—	$	90
	Other commercial construction and land	—				—				—				—			563		—		563
	Multifamily commercial real estate	305				—				—				—			—		—		305
	1-4 family residential construction and land	—				—				—				—			1		—		1
	Total commercial real estate	305				—				—				—			654		—		959
	Owner occupied commercial real estate	20				—				—				—			3,394		—		3,414
	Commercial and industrial loans	2				—				—				—			1,879		66		1,947
	Lease financing	—				—				—				—			—		—		—
	Total commercial	22				—				—				—			5,273		66		5,361
	1-4 family residential	862				—				—				—			1,417		—		2,279
	Home equity loans	1,046				146				—				—			2,324		1,270		4,786
	Other consumer loans	1,800				—				—				—			806		—		2,606
	Total consumer	3,708				146				—				—			4,547		1,270		9,671
	Total loans	$	4,035			$	146			$	—			$	—		$	10,474	$	1,336	$	15,991
	(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	$	1,463			$	107			$	35,563			$	10,658		$	—	$	—	$	47,791
	Other commercial construction and land	1,105				—				58,633				8,479			—		—		68,217
	Multifamily commercial real estate	—				—				2,641				—			—		—		2,641
	1-4 family residential construction and land	5				—				1,796				—			—		—		1,801
	Total commercial real estate	2,573				107				98,633				19,137			—		—		120,450
	Owner occupied commercial real estate	4,626				260				33,974				6,631			—		—		45,491
Commercial and industrial loans	249				—				29,819				1,597			—		—		31,665
Lease financing	—				—				—				—			—		—		—
Total commercial	4,875				260				63,793				8,228			—		—		77,156
1-4 family residential	6,696				227				37,646				10,824			—		—		55,393
Home equity loans	1,733				59				7,313				1,227			—		—		10,332
Other consumer loans	344				—				1,249				67			—		—		1,660
Total consumer	8,773				286				46,208				12,118			—		—		67,385
Other	433				—				4,745				954			—		—		6,132
Total loans	$	16,654			$	653			$	213,379			$	40,437		$	—	$	—	$	271,123
Loans, Excluding Purchased Credit-Impaired Loans by Internal Ratings	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
	The following table summarizes loans, excluding PCI loans by internal rating at December 31, 2013:
										Substandard
	(Dollars in thousands)	Pass				Special Mention				Accruing/				Non-accrual			Doubtful		Total
										Accreting
	Non-owner occupied commercial real estate	$	285,919			$	568			$	985			$	90		$	—	$	287,562
	Other commercial construction and land	67,178				48				—				563			—		67,789
	Multifamily commercial real estate	28,882				—				305				—			—		29,187
	1-4 family residential construction and land	53,224				1,958				1,796				1			—		56,979
	Total commercial real estate	435,203				2,574				3,086				654			—		441,517
	Owner occupied commercial real estate	681,571				4,093				2,195				3,394			—		691,253
	Commercial and industrial loans	651,585				1,183				9,206				1,945			—		663,919
	Lease financing	2,676				—				—				—			—		2,676
	Total commercial	1,335,832				5,276				11,401				5,339			—		1,357,848
	1-4 family residential	384,235				28				—				1,417			—		385,680
	Home equity loans	263,490				37				3,050				3,593			—		270,170
	Other consumer loans	157,157				—				28				806			—		157,991
	Total consumer	804,882				65				3,078				5,816			—		813,841
	Other	61,006				—				273				—			—		61,279
	Total loans	$	2,636,923			$	7,915			$	17,838			$	11,809		$	—	$	2,674,485

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Allowance for Loan and Lease Losses	Activity in the allowance for loan and lease losses for the years ended December 31, 2014, 2013 and 2012 is as follows:
	(Dollars in thousands)		Years Ended
			31-Dec-14				31-Dec-13				31-Dec-12
	Balance, beginning of period		$	56,851			$	57,262			$	34,749
	Provision (reversal) for loan losses for PCI loans		(9,044		)		(1,923		)		13,462
	Provision for loan losses for non-PCI loans		8,455				16,041				11,029
	Non-PCI loans charged-off		(9,202		)		(18,723		)		(5,744		)
	Recoveries of non-PCI loans previously charged-off		3,151				4,194				3,766
	Balance, end of period		$	50,211			$	56,851			$	57,262
Roll Forward of the Allowance for Loan and Lease Losses	The following tables present the roll forward of the allowance for loan and lease losses for the year ended December 31, 2014 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		December 31, 2013				Provision/				Net(Charge-offs)/				31-Dec-14
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	4,635			$	(2,620	)		$	7			$	2,022
	Other commercial construction and land		8,217				4,088				(124		)		12,181
	Multifamily commercial real estate		320				(68		)		—				252
	1-4 family residential construction and land		1,558				(459		)		3				1,102
	Total commercial real estate		14,730				941				(114		)		15,557
	Owner occupied commercial real estate		4,450				(1,767		)		(179		)		2,504
	Commercial and industrial loans		8,310				758				434				9,502
	Lease financing		3				(3		)		—				—
	Total commercial		12,763				(1,012		)		255				12,006
	1-4 family residential		21,724				(6,245		)		(28		)		15,451
	Home equity loans		3,869				466				(1,520		)		2,815
	Other consumer loans		2,682				4,531				(3,091		)		4,122
	Total consumer		28,275				(1,248		)		(4,639		)		22,388
	Other		1,083				730				(1,553		)		260
	Total loans		$	56,851			$	(589	)		$	(6,051	)		$	50,211
	The following tables present the roll forward of the allowance for loan and lease losses for the year ended December 31, 2013 by the class of loans against which the allowance is allocated:
	(Dollars in thousands)		31-Dec-12				Provision/				Net (Charge-offs)/				31-Dec-13
							(Reversals)				Recoveries
	Non-owner occupied commercial real estate		$	3,764			$	1,305			$	(434	)		$	4,635
	Other commercial construction and land		12,711				(5,593		)		1,099				8,217
	Multifamily commercial real estate		348				(69		)		41				320
	1-4 family residential construction and land		1,716				(186		)		28				1,558
	Total commercial real estate		18,539				(4,543		)		734				14,730
	Owner occupied commercial real estate		4,055				1,169				(774		)		4,450
	Commercial and industrial loans		7,490				10,124				(9,304		)		8,310
	Lease financing		—				3				—				3
	Total commercial		11,545				11,296				(10,078		)		12,763
	1-4 family residential		15,740				5,896				88				21,724
	Home equity loans		8,670				(3,559		)		(1,242		)		3,869
	Other consumer loans		2,082				3,029				(2,429		)		2,682
	Total consumer		26,492				5,366				(3,583		)		28,275
	Other		686				1,999				(1,602		)		1,083
	Total loans		$	57,262			$	14,118			$	(14,529	)		$	56,851
Roll Forward of the Allowance for Loan and Lease Losses at the PCI and Non-PCI Levels	The following tables present the roll forward of the allowance for loan and lease losses for PCI and non-PCI loans for the years ended December 31, 2014, 2013 and 2012, by the class of loans against which the allowance is allocated:
	(Dollars in thousands)	Year Ended
		31-Dec-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	(293		)		—				(293		)
	Other commercial construction and land	(224		)		—				(224		)
	Multifamily commercial real estate	—				—				—
	1-4 family residential construction and land	(6		)		—				(6		)
	Total commercial real estate	(523		)		—				(523		)
	Owner occupied commercial real estate	(211		)		—				(211		)
	Commercial and industrial loans	(504		)		—				(504		)
	Lease financing	—				—				—
	Total commercial	(715		)		—				(715		)
	1-4 family residential	(114		)		—				(114		)
	Home equity loans	(1,740		)		—				(1,740		)
	Other consumer loans	(3,745		)		—				(3,745		)
	Total consumer	(5,599		)		—				(5,599		)
	Other	(2,365		)		—				(2,365		)
	Total charge-offs	(9,202		)		—				(9,202		)
	Recoveries:
	Non-owner occupied commercial real estate	300				—				300
	Other commercial construction and land	100				—				100
	Multifamily commercial real estate	—				—				—
	1-4 family residential construction and land	9				—				9
	Total commercial real estate	409				—				409
	Owner occupied commercial real estate	32				—				32
	Commercial and industrial loans	938				—				938
	Lease financing	—				—				—
	Total commercial	970				—				970
	1-4 family residential	86				—				86
	Home equity loans	220				—				220
	Other consumer loans	654				—				654
	Total consumer	960				—				960
	Other	812				—				812
	Total recoveries	3,151				—				3,151
	Net charge-offs	(6,051		)		—				(6,051		)
	Provision (reversal) for loan and lease losses:
	Non-owner occupied commercial real estate	(59		)		(2,561		)		(2,620		)
	Other commercial construction and land	334				3,754				4,088
	Multifamily commercial real estate	10				(78		)		(68		)
	1-4 family residential construction and land	(329		)		(130		)		(459		)
	Total commercial real estate	(44		)		985				941
	Owner occupied commercial real estate	(303		)		(1,464		)		(1,767		)
	Commercial and industrial loans	431				327				758
	Lease financing	(3		)		—				(3		)
	Total commercial	125				(1,137		)		(1,012		)
	1-4 family residential	589				(6,834		)		(6,245		)
	Home equity loans	1,761				(1,295		)		466
	Other consumer loans	4,603				(72		)		4,531
	Total consumer	6,953				(8,201		)		(1,248		)
	Other	1,421				(691		)		730
	Total provision (reversal) for loan and lease losses	8,455				(9,044		)		(589		)
	Allowance for loan and lease losses at the end of the period	$	21,355			$	28,856			$	50,211
	(Dollars in thousands)	Year Ended
		31-Dec-13
		Non-PCI				PCI				Total
	Allowance for loan and lease losses at the beginning of the period	$	17,439			$	39,823			$	57,262
	Charge-offs:
	Non-owner occupied commercial real estate	(92		)		—				(92		)
	Other commercial construction and land	(152		)		—				(152		)
	Multifamily commercial real estate	—				—				—
	1-4 family residential construction and land	—				—				—
Total commercial real estate	(244		)		—				(244		)
Owner occupied commercial real estate	(1,060		)		—				(1,060		)
Commercial and industrial loans	(10,123		)		—				(10,123		)
Lease financing	—				—				—
Total commercial	(11,183		)		—				(11,183		)
1-4 family residential	(40		)		—				(40		)
Home equity loans	(1,630		)		—				(1,630		)
Other consumer loans	(2,999		)		—				(2,999		)
Total consumer	(4,669		)		—				(4,669		)
Other	(2,627		)		—				(2,627		)
Total charge-offs	(18,723		)		—				(18,723		)
Recoveries:
Non-owner occupied commercial real estate	(342		)		—				(342		)
Other commercial construction and land	1,251				—				1,251
Multifamily commercial real estate	41				—				41
1-4 family residential construction and land	28				—				28
Total commercial real estate	978				—				978
Owner occupied commercial real estate	286				—				286
Commercial and industrial loans	819				—				819
Lease financing	—				—				—
Total commercial	1,105				—				1,105
1-4 family residential	128				—				128
Home equity loans	388				—				388
Other consumer loans	570				—				570
Total consumer	1,086				—				1,086
Other	1,025				—				1,025
Total recoveries	4,194				—				4,194
Net charge-offs	(14,529		)		—				(14,529		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	588				717				1,305
Other commercial construction and land	(1,708		)		(3,885		)		(5,593		)
Multifamily commercial real estate	(53		)		(16		)		(69		)
1-4 family residential construction and land	93				(279		)		(186		)
Total commercial real estate	(1,080		)		(3,463		)		(4,543		)
Owner occupied commercial real estate	442				727				1,169
Commercial and industrial loans	10,262				(138		)		10,124
Lease financing	3				—				3
Total commercial	10,707				589				11,296
1-4 family residential	277				5,619				5,896
Home equity loans	1,264				(4,823		)		(3,559		)
Other consumer loans	3,179				(150		)		3,029
Total consumer	4,720				646				5,366
Other	1,694				305				1,999
Total provision (reversal) for loan and lease losses	16,041				(1,923		)		14,118
Allowance for loan and lease losses at the end of the period	$	18,951			$	37,900			$	56,851
(Dollars in thousands)	Year Ended
	31-Dec-12
	Non-PCI				PCI				Total
Allowance for loan and lease losses at the beginning of the period	$	8,388			$	26,361			$	34,749
Charge-offs:
Non-owner occupied commercial real estate	(219		)		—				(219		)
Other commercial construction and land	(83		)		—				(83		)
Multifamily commercial real estate	—				—				—
1-4 family residential construction and land	—				—				—
Total commercial real estate	(302		)		—				(302		)
Owner occupied commercial real estate	(50		)		—				(50		)
Commercial and industrial loans	(371		)		—				(371		)
Lease financing	—				—				—
Total commercial	(421		)		—				(421		)
1-4 family residential	(1,722		)		—				(1,722		)
Home equity loans	(1,511		)		—				(1,511		)
Other consumer loans	—				—				—
Total consumer	(3,233		)		—				(3,233		)
Other	(1,788		)		—				(1,788		)
Total charge-offs	(5,744		)		—				(5,744		)
Recoveries:
Non-owner occupied commercial real estate	1,093				—				1,093
Other commercial construction and land	542				—				542
Multifamily commercial real estate	6				—				6
1-4 family residential construction and land	(15		)		—				(15		)
Total commercial real estate	1,626				—				1,626
Owner occupied commercial real estate	429				—				429
Commercial and industrial loans	298				—				298
Lease financing	—				—				—
Total commercial	727				—				727
1-4 family residential	47				—				47
Home equity loans	76				—				76
Other consumer loans	259				—				259
Total consumer	382				—				382
Other	1,031				—				1,031
Total recoveries	3,766				—				3,766
Net charge-offs	(1,978		)		—				(1,978		)
Provision (reversal) for loan and lease losses:
Non-owner occupied commercial real estate	179				(1,143		)		(964		)
Other commercial construction and land	842				3,783				4,625
Multifamily commercial real estate	115				(171		)		(56		)
1-4 family residential construction and land	514				296				810
Total commercial real estate	1,650				2,765				4,415
Owner occupied commercial real estate	(421		)		(1,357		)		(1,778		)
Commercial and industrial loans	4,040				(643		)		3,397
Lease financing	—				—				—
Total commercial	3,619				(2,000		)		1,619
1-4 family residential	1,001				7,440				8,441
Home equity loans	1,859				5,746				7,605
Other consumer loans	1,823				(83		)		1,740
Total consumer	4,683				13,103				17,786
Other	1,077				(406		)		671
Total provision (reversal) for loan and lease losses	11,029				13,462				24,491
Allowance for loan and lease losses at the end of the period	$	17,439			$	39,823			$	57,262
Summary of Allowance for Loan and Lease Losses and Recorded Investment in Loans by Class of Loans and by Impairment Evaluation	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.
	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, 2013:
	(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	$	—			$	1,615			$	3,020			$	877		$	286,685	$	488,171
	Other commercial construction and land	—				1,201				7,016				—			67,789		232,705
	Multifamily commercial real estate	—				116				204				—			29,187		38,501
	1-4 family residential construction and land	—				1,065				493				—			56,979		14,372
	Total commercial real estate	—				3,997				10,733				877			440,640		773,749
	Owner occupied commercial real estate	—				2,611				1,839				4,844			686,409		366,895
	Commercial and industrial loans	507				6,370				1,433				9,623			654,296		139,817
	Lease financing	—				3				—				—			2,676		—
	Total commercial	507				8,984				3,272				14,467			1,343,381		506,712
	1-4 family residential	—				2,279				19,445				—			377,668		418,642
	Home equity loans	—				398				3,471				—			270,170		116,196
	Other consumer loans	5				2,313				364				207			157,784		12,535
	Total consumer	5				4,990				23,280				207			805,622		547,373
	Other	—				468				615				273			61,006		49,710
	Total loans	$	512			$	18,439			$	37,900			$	15,824		$	2,650,649	$	1,877,544
	-1	Loans collectively evaluated for impairment include $435.0 million of acquired loans which are presented net of unamortized purchase discounts of $14.7 million.

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2011	$	66,282
	Indemnification asset income	10,728
	Amortization of indemnification asset	(9,403		)
	Cash received on reimbursable losses	(18,190		)
	Balance, December 31, 2012	49,417
	Indemnification asset income	2,245
	Amortization of indemnification asset	(7,901		)
	Cash received on reimbursable losses	(10,151		)
	Balance, December 31, 2013	33,610
	Indemnification asset expense	(2,066		)
	Amortization of indemnification asset	(9,465		)
	Cash received on reimbursable losses	(5,317		)
	Balance, December 31, 2014	$	16,762

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of the Cost and Accumulated Depreciation of Premises and Equipment	The following is a summary of the cost and accumulated depreciation of premises and equipment:
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			Estimated Useful Life
	Land	$	50,690		$	49,219
	Buildings and leasehold improvements	122,204			124,312			<1 to 40 years
	Furniture, fixture and equipment	70,693			65,605			<1 to 40 years
	Construction in progress	1,827			564
	Premises and equipment, gross	245,414			239,700
	Less: Accumulated depreciation	(72,238		)	(59,845		)
	Premises and equipment, net	$	173,176		$	179,855
Summary of Future Minimum Lease Payments	Future minimum lease payments, before considering renewal options that generally are present, are as follows at December 31, 2014:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	8,267
	2016		7,586
	2017		6,458
	2018		5,555
	2019		4,745
	Thereafter		20,253
	Total		$	52,864

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Goodwill	Changes in goodwill during the years ended December 31, 2014, 2013 and 2012 consist of the following:
	(Dollars in thousands)
	Balance, December 31, 2011	$	115,960
	Goodwill associated with the acquisition of SCMF	16,027
	Balance, December 31, 2012	131,987
	Balance, December 31, 2013	131,987
	Out of period adjustment goodwill associated with GRNB	2,535
	Balance, December 31, 2014	$	134,522
Summary of Changes in Intangibles Assets	Changes in intangible assets during the years ended December 31, 2014, 2013 and 2012 are presented below:
	(Dollars in thousands)	Core Deposit			Trade Name			Customer Relationship			Mortgage Service Rights
	Balance, December 31, 2011	$	25,649		$	464		$	191		$	388
	Increase associated with acquisition of SCMF	6,860			—			—			—
	Increase associated with Trademark	—			100			—			—
	Impairment of wealth management intangible	—			(33		)	(169		)	—
	Amortization	(4,466		)	(213		)	(22		)	(113		)
	Balance, December 31, 2012	28,043			318			—			275
	Amortization	(4,992		)	(201		)	—			(78		)
	Balance, December 31, 2013	23,051			117			—			197
	Amortization	(4,390		)	(17		)	—			(61		)
	Balance, December 31, 2014	$	18,661		$	100		$	—		$	136
Summary of Estimated Intangible Asset Amortization Expense	Estimated intangible asset amortization expense for each of the next five years is as follows:
	(Dollars in thousands)
	Periods ending December 31,
	2015		$	3,806
	2016		3,733
	2017		3,667
	2018		3,604
	2019		2,763
	Thereafter		1,224
	Total		$	18,797

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Other Real Estate Owned
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			31-Dec-12
	Balance, beginning of period	$	129,396		$	154,093		$	168,781
	OREO acquired through acquisitions	—			—			20,183
	Real estate acquired from borrowers	34,970			69,403			84,556
	Valuation allowance	(10,901		)	(22,034		)	(22,498		)
	Properties sold	(75,839		)	(72,066		)	(96,929		)
	Balance, end of period	$	77,626		$	129,396		$	154,093

Time_Deposits_Tables

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Summary of Contractual Maturities of Time Deposits	At December 31, 2014, the scheduled contractual maturities of time deposits are as follows:
	(Dollars in thousands)
	Years ending December 31,
	2015	$	785,398
	2016	255,069
	2017	258,163
	2018	40,301
	2019	77,959
	Thereafter	27
	Subtotal	1,416,917
	Unamortized purchase accounting fair value premium	1,783
	Total	$	1,418,700

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances and Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Federal Home Loan Bank Advance Owed	The advances as of December 31, 2014 and 2013 consisted of the following:
	(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.
	(Dollars in thousands)
	Contractual
	Outstanding
	Amount
	31-Dec-13		Maturity Date	Fixed Contractual Rate
	$	95,000	May 16, 2014	0.36%
	724		November 6, 2017	0.50%
	554		February 10, 2026	—%
	$	96,278

LongTerm_Borrowings_Tables

Long-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Outstanding Structured Repurchase Agreements	The repurchase agreements as of December 31, 2014 and 2013 consisted of the following:
	(Dollars in thousands)
	Carrying Amount
	31-Dec-14				31-Dec-13				Contractual Amount				Maturity Date	Contractual Rate
	$	10,540			$	10,823			$	10,000			November 6, 2016	4.75%
	10,582				10,833				10,000				March 30, 2017	4.50%
	10,394				10,521				10,000				December 18, 2017	3.79%
	10,372				10,492				10,000				December 18, 2017	3.72%
	10,638				10,780				10,000				March 22, 2019	3.56%
	$	52,526			$	53,449			$	50,000
Summary of Subordinated Debentures	The subordinated debentures as of December 31, 2014 and 2013 consisted of the following:
	(Dollars in thousands)
							Carrying Amount
	Date of Offering		Face Amount				31-Dec-14				31-Dec-13			Interest Rate as of December 31, 2014			Maturity Date
	July 31, 2001		$	5,000			$	3,900			$	3,851		3.81	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	July 31, 2001		4,000				2,699				2,636			3.81	%	(3 Month LIBOR + 358 bps)	July 31, 2031
	June 26, 2003		10,000				6,017				5,921			3.35	%	(3 Month LIBOR + 310 bps)	June 26, 2033
	September 25, 2003		10,000				6,516				6,368			3.08	%	(3 Month LIBOR + 285 bps)	October 8, 2033
	December 30, 2003		10,000				5,802				5,704			3.08	%	(3 Month LIBOR + 285 bps)	December 30, 2033
	June 28, 2005		3,000				1,594				1,545			1.92	%	(3 Month LIBOR + 168 bps)	June 28, 2035
	December 22, 2005		10,000				4,607				4,491			1.64	%	(3 Month LIBOR + 140 bps)	March 15, 2036
	December 28, 2005		13,000				6,668				6,458			1.78	%	(3 Month LIBOR + 154 bps)	March 15, 2036
	June 23, 2006		20,000				11,488				11,206			1.78	%	(3 Month LIBOR + 155 bps)	July 7, 2036
	May 16, 2007		56,000				28,904				28,050			1.89	%	(3 Month LIBOR + 165 bps)	June 15, 2037
	June 15, 2007		10,000				5,426				5,327			1.67	%	(3 Month LIBOR + 143 bps)	September 6, 2037
			$	151,000			$	83,621			$	81,557
Schedule of Maturities of Long-Term Borrowings	At December 31, 2014, the maturities of long-term borrowings were as follows:
	(Dollars in thousands)		Fixed Rate				Floating Rate				Total
	Due in 2015		$	—			$	—			$	—
	Due in 2016		10,540				—				10,540
	Due in 2017		31,348				—				31,348
	Due in 2018		—				—				—
	Due in 2019		10,638				—				10,638
	Thereafter		3,534				83,621				87,155
	Total		$	56,060			$	83,621			$	139,681

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
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 years ended December 31, 2014, 2013 and 2012:
	(Dollars in thousands)	Years Ended
		31-Dec-14				31-Dec-13				31-Dec-12
	Stock options	$	764			$	571			$	9,763
	Restricted stock	1,878				4,868				8,918
	Total stock-based compensation expense	$	2,642			$	5,439			$	18,681
	Salaries and employee benefits	$	2,642			$	5,439			$	17,384
	Other expenses	—				—				1,297
	Total stock-based compensation expense	$	2,642			$	5,439			$	18,681
Summary of Weighted Average Assumptions to Compute the Grant-Date Fair Value of Options	The following table summarizes the weighted average assumptions used to compute the grant-date fair value of options granted during the years ended December 31, 2013 and 2012 :
		Years Ended
		31-Dec-13		December 31, 2012
	Dividend yield	—%		—%
	Risk-free interest rate	1.00%		0.91%
	Expected option life	5.75 years		5.25 years
	Volatility	37%		45%
	Weighted average grant-date fair value of options granted	$6.52		$8.05
Summary of Stock Option Activity	A summary of the stock option activity for the years ended December 31, 2014, 2013 and 2012 is as follows:
		Years Ended
		December 31, 2014							December 31, 2013							December 31, 2012
	(Shares in thousands)	Shares			Weighted				Shares			Weighted				Shares		Weighted
					Average							Average						Average
					Exercise Price Per Share							Exercise Price						Exercise Price Per Share
												Per Share
	Balance, January 1,	3,124			$	20.5			2,890			$	21.39			2,236		$	20
	Granted	—			—				264			18				657		27.17
	Exercised	—			—				—			—				—		—
	Canceled, expired or forfeited	(13	)		80.99				(30	)		83.28				(3	)	276.34
	Balance, December 31,	3,111			$	20.26			3,124			$	20.5			2,890		$	21.39
Summary of Options Outstanding	Options outstanding at December 31, 2014 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			8.39 years		$	18			122			$	18
	$20.00	2,864			5.43 years		20				2,864			20
	$28.44 - $2,026.00	11			3.28 years		139.44				11			139.44
	$18.00 - $2,026.00	3,111			5.65 years		$	20.26			2,997			$	20.35
Summary of Unvested Restricted Stock Awards	The following table summarizes unvested restricted stock activity for the years ended December 31, 2014, 2013 and 2012:
		Years Ended
		December 31, 2014							December 31, 2013							December 31, 2012
	(Shares in thousands)	Shares			Weighted				Shares			Weighted				Shares		Weighted
					Average							Average						Average
					Grant-Date							Grant-Date						Grant-Date
					Fair Value							Fair Value						Fair Value
					Per Share							Per Share						Per Share
	Balance, January 1,	1,215			$	14.28			1,211			$	14.27			967		$	13.26
	Granted	—			—				4			18				307		18.01
	Vested or released	(405	)		15.07				—			—				(63	)	17
	Canceled, expired or forfeited	—			—				—			—				—		—
	Balance, December 31,	810			$	13.89			1,215			$	14.28			1,211		$	14.27

Shareholders_Equity_and_Minimu1

Shareholders' Equity and Minimum Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Minimum Ratios Along with the Actual Ratios for the Company and the Bank	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
	December 31, 2014	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%
	(Dollars in thousands)	Well Capitalized		Adequately Capitalized		Actual
		Requirement		Requirement
	31-Dec-13	Amount	Ratio	Amount	Ratio	Amount		Ratio
	Tier 1 Capital
	(to Average Assets)
	CBF Consolidated	N/A	N/A	$254,126	≥ 4.0%	$	949,619	14.90%
	Capital Bank, N.A.	$317,562	≥ 5.0%	$254,050	≥ 4.0%	$	849,520	13.40%
	Tier 1 Capital
	(to Risk Weighted Assets)
	CBF Consolidated	N/A	N/A	$192,428	≥ 4.0%	$	949,619	19.70%
	Capital Bank, N.A.	$288,410	≥ 6.0%	$192,273	≥ 4.0%	$	849,520	17.70%
	Total Capital
	(to Risk Weighted Assets)
	CBF Consolidated	N/A	N/A	$384,856	≥ 8.0%	$	1,010,422	21.00%
	Capital Bank, N.A.	$480,683	≥ 10.0%	$384,546	≥ 8.0%	$	910,162	18.90%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
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 years ended December 31, 2014, 2013 and 2012 is as follows:
	(Dollars in thousands)	Years Ended
		31-Dec-14			31-Dec-13			31-Dec-12
	Income before income taxes	$	81,609		$	66,214		$	33,483
	Income taxes computed at Federal statutory tax rate	28,563			23,175			11,719
	Effect of:
	State taxes (net of federal benefit)	2,720			2,532			1,280
	State statutory rate change	421			1,545			—
	Transactions and legal costs	—			—			615
	Tax-exempt interest income, net	(1,247		)	(681		)	(715		)
	Change in estimate of deductible loan losses	—			—			(33,975		)
	Contingent value right expense (CVR)	597			1,192			—
	Other, net	(363		)	(393		)	(466		)
	Total income tax expense	$	30,691		$	27,370		$	(21,542	)
Details of Net Deferred Tax Assets	The composition of the net deferred tax asset as of December 31, 2014 and 2013 is as follows:
	(Dollars in thousands)
		31-Dec-14			31-Dec-13
	Deferred tax assets:
	Loan basis differences	$	35,590		$	57,279
	Net operating loss and AMT carryforwards	33,937			46,528
	OREO basis differences	43,724			40,807
	Allowance for loan and lease losses	19,151			22,081
	Stock based compensation	10,821			12,828
	Employee compensation and retirement benefits	2,515			2,898
	Goodwill	1,605			1,854
	CD premium	6,888			9,857
	Net unrealized losses on AFS investments securities	3,171			4,736
	Other	3,197			300
	Total deferred tax assets	160,599			199,168
	Deferred tax liabilities:
	FDIC indemnification asset	(6,393		)	(11,702		)
	Borrowings	(12,969		)	(10,243		)
	Depreciation	(1,219		)	(2,579		)
	Deferred loan costs	(5,730		)	(3,375		)
	Other intangibles	(1,595		)	(526		)
	Other	(3,069		)	(3,981		)
	Total gross deferred tax liabilities	(30,975		)	(32,406		)
	Net deferred tax asset	129,624			166,762
	Valuation allowance	—			—
	Net deferred tax asset	$	129,624		$	166,762

Loan_Commitments_and_Other_Rel1

Loan Commitments and Other Related Activity (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk	The contractual amount of financial instruments with off-balance-sheet risk at December 31, 2014 is as follows :
	(Dollars in thousands)	Fixed Rate		Variable Rate		Total
	Commitments to make loans	$	65,522	$	12,070	$	77,592
	Unfunded commitments under lines of credit	177,687		854,121		1,031,808
	Total	$	243,209	$	866,191	$	1,109,400

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2014
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 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
	Marketable equity securities		—				—			—				—
	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.
	Assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 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		$	6,348			$	4,477		$	1,871			(1	)	$	—
	Available-for-sale securities:
	Asset-backed securities		133,225				—			133,225						—
	Mortgage-backed securities-residential		546,626				—			546,626						—
	Industrial revenue bonds		3,859				—			—						3,859
	Marketable equity securities		931				—			931				(1	)	—
	Collateralized debt obligations		800				—			800						—
	Available-for-sale securities		$	685,441			$	—		$	681,582					$	3,859
	Gross asset value of derivatives		$	15			$	—		$	15					$	—
	Liabilities
	Gross liability value of derivatives		$	1,330			$	—		$	1,330					$	—
	-1	Transferred from Level 1 to Level 2 due to limited observable market data.
Fair Value Measurements on Recurring Basis Using Significant Unobservable Inputs (Level 3)	The tables below present 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 year ended and held at December 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			1
	Ending balance, December 31, 2014			$	3,690
	The tables below present 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 year ended and held at December 31, 2013:
	(Dollars in thousands)		Fair Value Measurement Using Significant
			Unobservable Inputs (Level 3)
			Corporate Bonds				Industrial			Collateralized
							Revenue			Debt
							Bonds			Obligations
	Beginning balance, January 1, 2013		$	26			$	3,800		$	297
	Included in earnings-gain on sales		199				—			—
	Included in other comprehensive income		—				59			503
	Sales		(225		)		—			—
	Transfer out of Level 3									(800		)	(2	)
	Ending balance, December 31, 2013		$	—			$	3,859		$	—
	(2) Transferred from Level 3 to Level 2 as a result of recent transaction information.
Quantitative Information About Recurring Level 3 Fair Value Measurements
	(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%
	(Dollars in thousands)		Fair Value at				Valuation Technique		Significant	Range
			December 31, 2013						Unobservable
									Input
	Industrial revenue bonds		$	3,859			Discounted cash flow		Discount rate	3.7%-3.9%
									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 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.
	Assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2013 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		$	—			$	—		$	118,579
	Other repossessed assets		—				108			—
	Impaired loans		—				—			1,332
Quantitative Information About Nonrecurring Level 3 Fair Value Measurements
	(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%
	(Dollars in thousands)		Fair Value at				Valuation Technique		Significant Unobservable Input	Range
			December 31, 2013
	Other real estate owned		$	118,579			Fair value of property		Appraised value less cost to sell	7%-10%
	Impaired loans		1,332				Fair value of collateral		Appraised value less cost to sell	8%
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
	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
	(Dollars in thousands)		Fair Value Measurement
	December 31, 2013		Carrying Value				Estimated			Level 1				Level 2			Level 3
							Fair Value
	Financial Assets
	Cash and cash equivalents		$	164,441			$	164,441		$	164,441			$	—		$	—
	Trading securities		6,348				6,348			4,477				1,871			—
	Investment securities available-for-sale		685,441				685,441			—				681,582			3,859
	Investment securities held-to-maturity		465,098				459,693			—				459,693			—
	Loans, net		4,495,178				4,681,554			—				8,012			4,673,542
	FDIC indemnification asset		33,610				33,610			—				—			33,610
	Receivable from FDIC		7,624				7,624			—				7,624			—
	Other earning assets (1)		44,088				44,088			—				—			44,088
	Gross asset value of derivatives		15				15			—				15			—
	Total financial assets		$	5,901,843			$	6,082,814		$	168,918			$	1,158,797		$	4,755,099
	Financial Liabilities
	Non-contractual deposits		$	3,737,566			$	3,737,566		$	—			$	—		$	3,737,566
	Contractual deposits		1,447,497				1,448,032			—				—			1,448,032
	Federal Home Loan Bank advances		96,278				96,241			—				96,241			—
	Short-term borrowings		24,850				24,850			—				24,850			—
	Long-term borrowings		53,449				55,861			—				—			55,861
	Subordinated debentures		85,112				100,795			—				—			100,795
	Gross liability value of derivatives		1,330				1,330			—				1,330			—
	Total financial liabilities		$	5,446,082			$	5,464,675		$	—			$	122,421		$	5,342,254
	(1) Includes Federal Reserve Bank, Federal Home Loan Bank and Bankers Bank stocks.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Instrument Contracts Fair Value and Notional Amount	The Company’s derivative instrument contracts which are recorded in other assets and other liabilities on the Company’s balance sheets consist of the following:
	(Dollars in thousands)	31-Dec-14				December 31, 2013
		Fair Value		Notional		Fair Value		Notional
				Amount				Amount
	Assets
	Interest rate cap contracts (matured in 2014)	$	—	$	—	$	—	$	12,500
	Forward loan sales contracts (maturing in 2015 and 2014, respectively)	4		1,640		15		4,215
	Total assets	$	4	$	1,640	$	15	$	16,715
	Liabilities
	Interest rate swaps associated with certificates of deposits (terminated in 2014)	$	—	$	—	$	1,320	$	25,000
	Forward loan sales contracts (maturing in 2015 and 2014, respectively)	26		7,578		10		3,545
	Total liabilities	$	26	$	7,578	$	1,330	$	28,545

Condensed_Financial_Informatio1

Condensed Financial Information about Capital Bank Financial Corp. (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheets
	Condensed Balance Sheets
	(Parent only)
	(Dollars in thousands)	31-Dec-14			31-Dec-13
	Assets
	Cash and due from banks	$	54,780		$	109,939
	Investment in Bank subsidiary	1,107,652			1,100,473
	Investment in other subsidiaries	4,696			4,691
	Note receivable from subsidiary	3,393			3,393
	Other assets	16,213			12,684
	Total Assets	$	1,186,734		$	1,231,180
	Liabilities and Shareholders’ Equity
	Long-term borrowings1	$	91,831		$	89,787
	Accrued expenses and other liabilities	31,329			28,605
	Shareholder's equity	1,063,574			1,112,788
	Total Liabilities and Shareholders’ Equity	$	1,186,734		$	1,231,180
Schedule of Condensed Statements of Income
	Condensed Statements of Income
	(Parent only)
		Years Ended
	(Dollars in thousands)	31-Dec-14			31-Dec-13			31-Dec-12
	Operating income
	Interest income	$	515		$	463		$	99
	Dividend income from subsidiary2	56,113			106,023			35
	Legal settlement	—			400			—
	Management fee income	—			—			3,200
	Total operating income	56,628			106,886			3,334
	Operating expense
	Salaries and benefits including stock-based compensation	3,093			5,846			21,233
	Interest expense	5,854			7,061			2,512
	Gains on extinguishment of debt	—			(122		)	—
	Contingent value right expense	1,706			2,833			188
	Other expense	3,131			3,811			3,605
	Total operating expense	13,784			19,429			27,538
	Income (loss) before income tax benefit and equity in undistributed earnings of subsidiaries	42,844			87,457			(24,204		)
	Income tax benefit	4,598			5,998			9,085
	Income (loss) before equity in undistributed earnings of subsidiaries	47,442			93,455			(15,119		)
	Undistributed equity of subsidiaries, net of tax	3,476			(54,611		)	65,610
	Net income	$	50,918		$	38,844		$	50,491
Schedule of Condensed Statements of Cash Flows
	Condensed Statements of Cash Flows
	(Parent only)
		Years Ended
	(Dollars in thousands)	31-Dec-14			31-Dec-13			31-Dec-12
	Cash flows from operating activities
	Net income	$	50,918		$	38,844		$	50,491
	Equity in income from subsidiaries	(3,476		)	54,287			(65,610		)
	Stock-based compensation expense	2,642			5,439			18,681
	Decrease in net income tax obligation	(2,856		)	(6,002		)	(8,820		)
	Change in other assets	44			153			1,030
	Change in accrued expenses and other liabilities	(807		)	4,535			(8,787		)
	Net cash provided by (used in) operating activities	46,465			97,256			(13,015		)
	Cash flows from investing activities
	Investment in bank subsidiary	—			—			—
	Investment in bank holding company subsidiaries	—			—			(92,879		)
	Net cash used in investing activities	—			—			(92,879		)
	Cash flows from financing activities
	Purchase of treasury stock	(103,227		)	(69,962		)	—
	Repayments of advances from subsidiaries	—			(42,797		)	—
	Excess tax benefit from share-based payment	1,603			—			—
	Cash in lieu of fractional shares	—			(2		)	—
	Net proceeds from issuance of common shares and merger	—			—			89,362
	Net cash (used in) provided by financing activities	(101,624		)	(112,761		)	89,362
	Net decrease in cash and cash equivalents	(55,159		)	(15,505		)	(16,532		)
	Cash and cash equivalents at beginning of period	109,939			125,444			141,976
	Cash and cash equivalents at end of period	$	54,780		$	109,939		$	125,444
	Supplemental disclosures of non-cash transactions:
	Elimination of noncontrolling interest	$	—		$	—		$	79,413
	Net acquisition of non-cash liabilities	—			—			(156,942		)

Supplemental_Financial_Data_Ta

Supplemental Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Other Expense in Excess of 1 Percent of Total Interest and Non-Interest Income	Components of other expense in excess of 1.0% of total interest and non-interest income are as follows:
		Years Ended
	(Dollars in thousands)	31-Dec-14		31-Dec-13		31-Dec-12
	Amortization of intangibles	$	4,303	$	5,082	$	4,718
	Postage, courier and armored car	3,468		3,845		3,901

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary of Unaudited Quarterly Results	The following is a summary of unaudited quarterly results for 2014 and 2013:
	(Dollars in thousands)	Year Ended December 31, 2014											Year Ended December 31, 2013
		Fourth			Third			Second		First			Fourth		Third		Second		First
	Condensed income statements:
	Interest and dividend income	$	67,750		$	67,643		$	66,846	$	68,543		$	71,981	$	72,480	$	73,189	$	76,106
	Net interest income	61,351			61,425			60,831		62,453			65,723		65,386		65,352		67,114
	Provision (reversal) for loan losses	(637		)	(1,332		)	1,404		(24		)	3,265		984		4,467		5,402
	Net income	13,836			13,243			12,425		11,414			12,206		11,444		9,429		5,765
	Basic earnings per common shares	$	0.29		$	0.28		$	0.25	$	0.23		$	0.24	$	0.22	$	0.18	$	0.11
	Diluted earnings per common shares	$	0.29		$	0.27		$	0.25	$	0.22		$	0.23	$	0.22	$	0.17	$	0.11

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2014
	Office	Reporting_Unit
	Segment
	depository_institution
	Reporting_Unit
Summary Of Significant Accounting Policies [Line Items]
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
Goodwill	134,522,000	131,987,000	131,987,000	115,960,000
Period Of Recourse Subsequent To Sale Of Loan		7 months
Accrual Period Of Nonaccrual Loans		90 days
Non Accrual Loans Minimum Recorded Value For Impairment Evaluation	500,000
Goodwill Impairment Test Number Of Reporting Units		1
Income Tax Examination, Likelihood of Unfavorable Settlement	greater than 50%
Contingent Value Rights Amount	17,400,000	15,700,000
Clawback Liability	1,300,000	1,000,000
Due to Related Parties	13,900,000	10,900,000
Number of Reportable Segments	1
Prior Period Adjustment
Summary Of Significant Accounting Policies [Line Items]
Goodwill					2,500,000
Substandard
Summary Of Significant Accounting Policies [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$1,000,000

Earnings_Per_Common_Share_Comp

Earnings Per Common Share - Computation of Earnings Per Share (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted average number of shares outstanding:
Basic (in shares)	48,610	52,614	47,779
Diluted (in shares)	49,869	53,493	48,337
Stock Options
Weighted average number of shares outstanding:
Dilutive effect (in shares)	533	0	0
Restricted Stock Awards
Weighted average number of shares outstanding:
Dilutive effect (in shares)	726	879	558

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 (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive (in shares)	11	3,041	2,850
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive (in shares)	0	0	0

Business_Combinations_and_Acqu1

Business Combinations and Acquisitions - Additional Information (Detail) (Southern Community, USD $)	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Oct. 02, 2012	Oct. 01, 2012
		branch
Business Acquisition [Line Items]
Contingent Value right payment period	5 years
Savings of loans		75.00%
Number of branches		22
Maximum [Member]
Business Acquisition [Line Items]
Maximum potential payment		21.9
Preferred and Common Stock [Member]
Business Acquisition [Line Items]
Purchase price		99.3
Preferred and Common Stock [Member] | Contingent Value [Member]
Business Acquisition [Line Items]
Consideration paid		1.3
Common Stock [Member]
Business Acquisition [Line Items]
Purchase price		99.3
Series A Preferred Stock [Member]
Business Acquisition [Line Items]
Cash consideration used to purchase the branch	46.9

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$554,488	$688,717
Unrealized Gains	3,237	3,104
Unrealized Losses	1,832	6,380
Available-for-sale securities	555,893	685,441
Amortized Cost	436,962	465,098
Unrealized Gains	6,476	355
Unrealized Losses	59	5,760
Fair value of investment securities held-to-maturity	443,379	459,693
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		133,647
Unrealized Gains		363
Unrealized Losses		785
Available-for-sale securities		133,225
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		946
Unrealized Gains		0
Unrealized Losses		15
Available-for-sale securities		931
Mortgage-backed securities—residential issued by government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	550,908	549,869
Unrealized Gains	3,127	2,337
Unrealized Losses	1,832	5,580
Available-for-sale securities	552,203	546,626
Amortized Cost	384,428	435,380
Unrealized Gains	5,626	328
Unrealized Losses	56	5,218
Fair value of investment securities held-to-maturity	389,998	430,490
Industrial revenue bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,580	3,750
Unrealized Gains	110	109
Unrealized Losses	0	0
Available-for-sale securities	3,690	3,859
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,989	14,972
Unrealized Gains	230	0
Unrealized Losses	0	401
Fair value of investment securities held-to-maturity	14,219	14,571
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,000
Unrealized Gains	163
Unrealized Losses	0
Fair value of investment securities held-to-maturity	25,163
State and political subdivisions—tax exempt
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,008	14,201
Unrealized Gains	431	27
Unrealized Losses	3	129
Fair value of investment securities held-to-maturity	13,436	14,099
State and political subdivisions—taxable
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	537	545
Unrealized Gains	26	0
Unrealized Losses	0	12
Fair value of investment securities held-to-maturity	563	533
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		505
Unrealized Gains		295
Unrealized Losses		0
Available-for-sale securities		$800

Investment_Securities_Estimate

Investment Securities - Estimated Fair Value of Investment Securities Available for Sale and Held to Maturity by Contractual Maturity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost
Amortized Cost	$554,488	$688,717
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total, estimated fair value	555,893	685,441
Mortgage-backed securities-residential, Yield	1.87%
Amortized Cost
Total, amortized cost	436,962	465,098
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Total, estimated fair value	443,379	459,693
Total, Yield	2.58%
Debt Securities
Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	3,580
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, Estimated Fair Value	0
Due after one year through five years, Estimated Fair Value	0
Due after five years through ten years, Estimated Fair Value	0
Due after ten years, Estimated Fair Value	3,690
Due in one year or less, Yield	0.00%
Due after one year through five years, Yield	0.00%
Due after five years through ten years, Yield	0.00%
Due after ten years, Yield	2.24%
Amortized Cost
Due in one year or less	205
Due after one year through five years	10,814
Due after five years through ten years	26,374
Due after ten years	15,141
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Due in one year or less, Estimated Fair Value	205
Due after one year through five years, Estimated Fair Value	10,875
Due after five years through ten years, Estimated Fair Value	26,903
Due after ten years, Estimated Fair Value	15,398
Due in one year or less, Yield	0.77%
Due after one year through five years, Yield	4.66%
Due after five years through ten years, Yield	4.48%
Due after ten years, Yield	2.93%
Mortgage-backed securities—residential issued by government sponsored entities
Amortized Cost
Mortgage-backed securities—residential issued by government sponsored entities	550,908
Amortized Cost	550,908	549,869
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Mortgage-backed securities-residential	552,203
Total, estimated fair value	552,203	546,626
Mortgage-backed securities-residential, Yield	1.87%
Amortized Cost
Total, amortized cost	384,428
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Total, estimated fair value	389,998	430,490
Mortgage-backed securities-residential, Yield	2.38%
Marketable equity securities
Amortized Cost
Amortized Cost		946
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Total, estimated fair value		$931

Investment_Securities_Securiti

Investment Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Available-for-sale	$215,139	$443,331
Estimated Fair Value, 12 Months or Longer, Available-for-sale	28,439	0
Total, Estimated Fair Value, Available-for-sale	243,578	443,331
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Available-for-sale	1,596	6,380
Unrealized Losses,12 Months or Longer, Available-for-sale	236	0
Total, Unrealized Losses, Available-for-sale	1,832	6,380
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Held-to-maturity	14,891	367,926
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	14,891	367,926
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Held-to-maturity	59	5,760
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	59	5,760
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Available-for-sale		102,835
Estimated Fair Value, 12 Months or Longer, Available-for-sale		0
Total, Estimated Fair Value, Available-for-sale		102,835
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Available-for-sale		785
Unrealized Losses,12 Months or Longer, Available-for-sale		0
Total, Unrealized Losses, Available-for-sale		785
Marketable equity securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Available-for-sale		931
Estimated Fair Value, 12 Months or Longer, Available-for-sale		0
Total, Estimated Fair Value, Available-for-sale		931
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Available-for-sale		15
Unrealized Losses,12 Months or Longer, Available-for-sale		0
Total, Unrealized Losses, Available-for-sale		15
Mortgage-backed securities—residential issued by government sponsored entities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Available-for-sale	215,139	339,565
Estimated Fair Value, 12 Months or Longer, Available-for-sale	28,439	0
Total, Estimated Fair Value, Available-for-sale	243,578	339,565
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Available-for-sale	1,596	5,580
Unrealized Losses,12 Months or Longer, Available-for-sale	236	0
Total, Unrealized Losses, Available-for-sale	1,832	5,580
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Held-to-maturity	13,995	342,333
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	13,995	342,333
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Held-to-maturity	56	5,218
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	56	5,218
State and political subdivisions—tax exempt
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Held-to-maturity	896	10,489
Estimated Fair Value, 12 Months or Longer, Held-to-maturity	0	0
Total, Estimated Fair Value, Held-to-maturity	896	10,489
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Held-to-maturity	3	129
Unrealized Losses, 12 Months or Longer, Held-to-maturity	0	0
Total, Unrealized Losses, Held-to-maturity	3	129
State and political subdivisions—taxable
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Held-to-maturity		533
Estimated Fair Value, 12 Months or Longer, Held-to-maturity		0
Total, Estimated Fair Value, Held-to-maturity		533
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Held-to-maturity		12
Unrealized Losses, 12 Months or Longer, Held-to-maturity		0
Total, Unrealized Losses, Held-to-maturity	0	12
U.S. Government agencies
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Estimated Fair Value, Less than 12 Months, Held-to-maturity		14,571
Estimated Fair Value, 12 Months or Longer, Held-to-maturity		0
Total, Estimated Fair Value, Held-to-maturity		14,571
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized Losses, Less than 12 Months, Held-to-maturity		401
Unrealized Losses, 12 Months or Longer, Held-to-maturity		0
Total, Unrealized Losses, Held-to-maturity	$0	$401

Investment_Securities_Credit_L

Investment Securities - Credit Losses Recognized in Earnings (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning Balance		$714	$660	$616
Credit losses recognized during the period	54	0	54	44
Ending Balance		$714	$714	$660

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended		12 Months Ended
	Dec. 18, 2014	Jan. 07, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
					Security
Investments, Debt and Equity Securities [Abstract]
Trading securities			$6,348,000		$2,410,000	$6,348,000
Proceeds from sales and calls of securities available for sale					216,900,000	2,100,000	496,300,000
Gross gains realized on sales and calls					1,100,000	200,000	8,400,000
Gross losses realized on sales and calls					0
Amount transferred from available-for-sale securities to held-to-maturity securities				511,000,000	0	510,976,000	0
Unrealized loss included in other comprehensive income (loss), net of tax			9,700,000
Held-to-maturity, investment securities				0
Credit losses recognized during the period				54,000	0	54,000	44,000
Change in estimated fair value of CDO			500,000			500,000
Securities in portfolio					129
Securities in portfolio in an unrealized loss position					26
Proceeds from sale of collateralized debt obligations	1,000,000	800,000
Gain on sale of debt investments	12,000	300,000
Investment securities, carrying values			$313,400,000		$339,000,000	$313,400,000

Loans_Major_Classifications_of

Loans - Major Classifications of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$5,000,219	$4,552,029
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,157,101	1,215,266
Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	798,556	775,733
Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	200,755	300,494
Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	89,132	67,688
Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	68,658	71,351
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,122,532	1,864,560
Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,046,736	1,058,148
Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,073,791	803,736
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,005	2,676
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,576,626	1,361,214
Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	925,698	804,322
Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	378,475	386,366
Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	272,453	170,526
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$143,960	$110,989

Loans_Roll_Forward_of_Accretab

Loans - Roll Forward of Accretable Yield (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accretable Yield
Balance at beginning of period	$383,775	$553,348	$715,479
New loans purchased			86,037
Accretion of income	-119,701	-161,867	-193,425
Reclassification from nonaccretable difference	71,626	84,203	89,218
Other	-43,067	-91,909	-143,961
Balance at end of period	292,633	383,775	553,348
Nonaccretable Difference
Nonaccretable difference, balance at the end of the period	$204,033	$286,272	$399,998

Loans_Summary_of_Companys_Esti

Loans - Summary of Company's Estimate of Cash Flows for Purchased Credit-Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Receivables [Abstract]
2015	$92,714
2016	65,090
2017	45,807
2018	29,787
2019	19,259
Thereafter	39,976
Total	$292,633	$383,775	$553,348	$715,479

Loans_Major_Categories_of_Loan

Loans - Major Categories of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	$4,802,572	$4,266,672
Covered loans	197,647	285,357
Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,107,411	1,131,261
Covered loans	49,690	84,005
Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	764,778	719,999
Covered loans	33,778	55,734
Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	190,376	281,332
Covered loans	10,379	19,162
Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	84,469	58,579
Covered loans	4,663	9,109
Total Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	67,788	71,351
Covered loans	870	0
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,067,334	1,787,046
Covered loans	55,198	77,514
Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	998,909	990,846
Covered loans	47,827	67,302
Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,066,420	793,524
Covered loans	7,371	10,212
Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,005	2,676
Covered loans	0	0
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,484,711	1,239,198
Covered loans	91,915	122,016
Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	873,795	733,723
Covered loans	51,903	70,599
Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	338,562	335,051
Covered loans	39,913	51,315
Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	272,354	170,424
Covered loans	99	102
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	143,116	109,167
Covered loans	844	1,822
Non-PCI Loans New
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,277,077	2,239,455
Covered loans	0	0
Non-PCI Loans New | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	545,421	356,534
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	372,793	219,482
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	66,817	67,537
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	47,765	12,537
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	58,046	56,978
Covered loans	0	0
Non-PCI Loans New | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,706,361	1,288,514
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	745,728	642,794
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	958,628	643,044
Covered loans	0	0
Non-PCI Loans New | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,005	2,676
Covered loans	0	0
Non-PCI Loans New | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	925,685	537,087
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	560,106	332,585
Covered loans	0	0
Non-PCI Loans New | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	103,644	52,918
Covered loans	0	0
Non-PCI Loans New | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	261,935	151,584
Covered loans	0	0
Non-PCI Loans New | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	99,610	57,320
Covered loans	0	0
Non-PCI Loans Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	324,694	397,543
Covered loans	32,199	37,487
Non-PCI Loans Acquired | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans		0
Non-PCI Loans Acquired | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	71,040	84,983
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	58,552	68,080
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	161	252
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	12,327	16,650
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	1
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	48,686	68,978
Covered loans	214	356
Non-PCI Loans Acquired | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	38,122	48,459
Covered loans	0	0
Non-PCI Loans Acquired | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	10,564	20,519
Covered loans	214	356
Non-PCI Loans Acquired | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	0
Covered loans	0	0
Non-PCI Loans Acquired | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	201,365	239,623
Covered loans	31,985	37,131
Non-PCI Loans Acquired | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	43,921	52,078
Covered loans	1,512	1,017
Non-PCI Loans Acquired | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	152,797	181,138
Covered loans	30,473	36,114
Non-PCI Loans Acquired | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,647	6,407
Covered loans	0
Non-PCI Loans Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,603	3,959
Covered loans	0	0
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,200,801	1,629,674
Covered loans	165,448	247,870
PCI Loans | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	490,950	689,744
Covered loans	49,690	84,005
PCI Loans | Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	333,433	432,437
Covered loans	33,778	55,734
PCI Loans | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	123,398	213,543
Covered loans	10,379	19,162
PCI Loans | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	24,377	29,392
Covered loans	4,663	9,109
PCI Loans | Total Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	9,742	14,372
Covered loans	870	0
PCI Loans | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	312,287	429,554
Covered loans	54,984	77,158
PCI Loans | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	215,059	299,593
Covered loans	47,827	67,302
PCI Loans | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	97,228	129,961
Covered loans	7,157	9,856
PCI Loans | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	0	0
Covered loans	0	0
PCI Loans | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	357,661	462,488
Covered loans	59,930	84,885
PCI Loans | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	269,768	349,060
Covered loans	50,391	69,582
PCI Loans | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	82,121	100,995
Covered loans	9,440	15,201
PCI Loans | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	5,772	12,433
Covered loans	99	102
PCI Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	39,903	47,888
Covered loans	$844	$1,822

Loans_Aging_of_the_Recorded_In

Loans - Aging of the Recorded Investment in Past Due Loans, Based on Contractual Terms (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$4,944,492	$4,487,166
Non-PCI Loans Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	14,076	15,991
Non-PCI Loans Acquired | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	798	959
Non-PCI Loans Acquired | Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	534	90
Non-PCI Loans Acquired | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	264	563
Non-PCI Loans Acquired | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	305
Non-PCI Loans Acquired | Total Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	1
Non-PCI Loans Acquired | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,058	5,361
Non-PCI Loans Acquired | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,268	3,414
Non-PCI Loans Acquired | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,790	1,947
Non-PCI Loans Acquired | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Non-PCI Loans Acquired | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,180	9,671
Non-PCI Loans Acquired | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,710	2,279
Non-PCI Loans Acquired | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,053	4,786
Non-PCI Loans Acquired | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,417	2,606
Non-PCI Loans Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	40
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	126,395	271,123
PCI Loans | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	48,384	120,450
PCI Loans | Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	16,743	47,791
PCI Loans | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	28,844	68,217
PCI Loans | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,924	2,641
PCI Loans | Total Commercial Real Estate | 1-4 family residential construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	873	1,801
PCI Loans | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	41,165	77,156
PCI Loans | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,792	45,491
PCI Loans | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	23,373	31,665
PCI Loans | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
PCI Loans | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	34,131	67,385
PCI Loans | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	27,841	55,393
PCI Loans | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,977	10,332
PCI Loans | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	313	1,660
PCI Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,715	6,132
Non-Covered Loans | Non-PCI Loans Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	4,367	4,035
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	8,906	10,474
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	31	305
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	767	654
Non-Covered Loans | Non-PCI Loans Acquired | 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
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	534	90
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	31	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	233	563
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	305
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Non-Covered Loans | Non-PCI Loans Acquired | 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
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	1
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	814	22
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	4,178	5,273
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	744	20
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	2,524	3,394
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	70	2
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	1,654	1,879
Non-Covered Loans | Non-PCI Loans Acquired | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Non-Covered Loans | Non-PCI Loans Acquired | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	3,492	3,708
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	3,951	4,547
Non-Covered Loans | Non-PCI Loans Acquired | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	357	862
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	1,284	1,417
Non-Covered Loans | Non-PCI Loans Acquired | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	627	1,046
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	1,758	2,324
Non-Covered Loans | Non-PCI Loans Acquired | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	2,508	1,800
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	909	806
Non-Covered Loans | Non-PCI Loans Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	30
Greater than 90 Days Past Due and Still Accruing/Accreting	0
Nonaccrual	10
Non-Covered Loans | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	5,122	16,654
Greater than 90 Days Past Due and Still Accruing/Accreting	108,255	213,379
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0
Non-Covered Loans | PCI Loans | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	363	2,573
Greater than 90 Days Past Due and Still Accruing/Accreting	42,342	98,633
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial Real Estate | Non-owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	164	1,463
Greater than 90 Days Past Due and Still Accruing/Accreting	14,943	35,563
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	199	1,105
Greater than 90 Days Past Due and Still Accruing/Accreting	24,602	58,633
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due		0
Greater than 90 Days Past Due and Still Accruing/Accreting	1,924	2,641
Nonaccrual	0	0
Non-Covered Loans | PCI 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	5
Greater than 90 Days Past Due and Still Accruing/Accreting	873	1,796
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,667	4,875
Greater than 90 Days Past Due and Still Accruing/Accreting	38,304	63,793
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,472	4,626
Greater than 90 Days Past Due and Still Accruing/Accreting	15,189	33,974
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	195	249
Greater than 90 Days Past Due and Still Accruing/Accreting	23,115	29,819
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	2,974	8,773
Greater than 90 Days Past Due and Still Accruing/Accreting	25,012	46,208
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,820	6,696
Greater than 90 Days Past Due and Still Accruing/Accreting	21,224	37,646
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	1,042	1,733
Greater than 90 Days Past Due and Still Accruing/Accreting	3,614	7,313
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	112	344
Greater than 90 Days Past Due and Still Accruing/Accreting	174	1,249
Nonaccrual	0	0
Non-Covered Loans | PCI Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	118	433
Greater than 90 Days Past Due and Still Accruing/Accreting	2,597	4,745
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	225	146
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	578	1,336
Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | 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
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate | Other commercial construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | 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
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	66	66
Covered Loans | Non-PCI Loans Acquired | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	66	66
Covered Loans | Non-PCI Loans Acquired | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	225	146
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	512	1,270
Covered Loans | Non-PCI Loans Acquired | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	69	0
Covered Loans | Non-PCI Loans Acquired | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	225	146
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	443	1,270
Covered Loans | Non-PCI Loans Acquired | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | Non-PCI Loans Acquired | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0
Nonaccrual	0
Covered Loans | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	136	653
Greater than 90 Days Past Due and Still Accruing/Accreting	12,882	40,437
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	107
Greater than 90 Days Past Due and Still Accruing/Accreting	5,679	19,137
Nonaccrual	0	0
Covered Loans | PCI 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	107
Greater than 90 Days Past Due and Still Accruing/Accreting	1,636	10,658
Nonaccrual	0	0
Covered Loans | PCI 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
Greater than 90 Days Past Due and Still Accruing/Accreting	4,043	8,479
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial Real Estate | Multifamily commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | PCI 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
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	260
Greater than 90 Days Past Due and Still Accruing/Accreting	1,194	8,228
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	260
Greater than 90 Days Past Due and Still Accruing/Accreting	1,131	6,631
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	63	1,597
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	0
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	136	286
Greater than 90 Days Past Due and Still Accruing/Accreting	6,009	12,118
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Consumer | 1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	115	227
Greater than 90 Days Past Due and Still Accruing/Accreting	4,682	10,824
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	21	59
Greater than 90 Days Past Due and Still Accruing/Accreting	1,300	1,227
Nonaccrual	0	0
Covered Loans | PCI Loans | Total Consumer | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	27	67
Nonaccrual	0	0
Covered Loans | PCI Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing/Accreting	0	954
Nonaccrual	$0	$0

Loans_Loans_Excluding_Purchase

Loans - Loans, Excluding Purchased Credit-Impaired Loans by Internal Ratings (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Total	$3,633,970	$2,674,485
Pass
Financing Receivable, Recorded Investment [Line Items]
Total	3,597,274	2,636,923
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	10,619	7,915
Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	16,593	17,838
Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	9,484	11,809
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total	616,461	441,517
Total Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	612,436	435,203
Total Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	882	2,574
Total Commercial Real Estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	2,376	3,086
Total Commercial Real Estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	767	654
Total Commercial Real Estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | Non-owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total	431,345	287,562
Total Commercial Real Estate | Non-owner occupied commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	429,126	285,919
Total Commercial Real Estate | Non-owner occupied commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	835	568
Total Commercial Real Estate | Non-owner occupied commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	850	985
Total Commercial Real Estate | Non-owner occupied commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	534	90
Total Commercial Real Estate | Non-owner occupied commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | Other commercial construction and land
Financing Receivable, Recorded Investment [Line Items]
Total	66,978	67,789
Total Commercial Real Estate | Other commercial construction and land | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	66,667	67,178
Total Commercial Real Estate | Other commercial construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	47	48
Total Commercial Real Estate | Other commercial construction and land | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	31	0
Total Commercial Real Estate | Other commercial construction and land | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	233	563
Total Commercial Real Estate | Other commercial construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | Multifamily commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total	60,092	29,187
Total Commercial Real Estate | Multifamily commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	60,092	28,882
Total Commercial Real Estate | Multifamily commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | Multifamily commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	0	305
Total Commercial Real Estate | Multifamily commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | Multifamily commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial Real Estate | 1-4 family residential construction and land
Financing Receivable, Recorded Investment [Line Items]
Total	58,046	56,979
Total Commercial Real Estate | 1-4 family residential construction and land | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	56,551	53,224
Total Commercial Real Estate | 1-4 family residential construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	0	1,958
Total Commercial Real Estate | 1-4 family residential construction and land | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	1,495	1,796
Total Commercial Real Estate | 1-4 family residential construction and land | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	0	1
Total Commercial Real Estate | 1-4 family residential construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial
Financing Receivable, Recorded Investment [Line Items]
Total	1,755,261	1,357,848
Total Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	1,732,100	1,335,832
Total Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	8,922	5,276
Total Commercial | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	9,995	11,401
Total Commercial | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	4,244	5,339
Total Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total	783,850	691,253
Total Commercial | Owner occupied commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	766,822	681,571
Total Commercial | Owner occupied commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	6,687	4,093
Total Commercial | Owner occupied commercial real estate | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	7,817	2,195
Total Commercial | Owner occupied commercial real estate | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	2,524	3,394
Total Commercial | Owner occupied commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total	969,406	663,919
Total Commercial | Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	963,273	651,585
Total Commercial | Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	2,235	1,183
Total Commercial | Commercial and industrial loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	2,178	9,206
Total Commercial | Commercial and industrial loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	1,720	1,945
Total Commercial | Commercial and industrial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total	2,005	2,676
Total Commercial | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	2,005	2,676
Total Commercial | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Lease financing | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Lease financing | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Commercial | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Consumer
Financing Receivable, Recorded Investment [Line Items]
Total	1,159,035	813,841
Total Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	1,150,008	804,882
Total Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	342	65
Total Consumer | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	4,222	3,078
Total Consumer | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	4,463	5,816
Total Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Consumer | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total	605,539	385,680
Total Consumer | 1-4 family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	601,738	384,235
Total Consumer | 1-4 family residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	283	28
Total Consumer | 1-4 family residential | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	2,165	0
Total Consumer | 1-4 family residential | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	1,353	1,417
Total Consumer | 1-4 family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Consumer | Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Total	286,914	270,170
Total Consumer | Home equity loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	282,597	263,490
Total Consumer | Home equity loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	59	37
Total Consumer | Home equity loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	2,057	3,050
Total Consumer | Home equity loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	2,201	3,593
Total Consumer | Home equity loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Consumer | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total	266,582	157,991
Total Consumer | Other consumer loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	265,673	157,157
Total Consumer | Other consumer loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Total Consumer | Other consumer loans | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	0	28
Total Consumer | Other consumer loans | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	909	806
Total Consumer | Other consumer loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Other
Financing Receivable, Recorded Investment [Line Items]
Total	103,213	61,279
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	102,730	61,006
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	473	0
Other | Substandard Accruing/Accreting
Financing Receivable, Recorded Investment [Line Items]
Total	0	273
Other | Substandard Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	10	0
Other | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	$0	$0

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$5,516,000	$8,012,000
Deferred loan origination costs	10,100,000	3,800,000
Total loans	5,000,219,000	4,552,029,000
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,122,532,000	1,864,560,000
Total Commercial | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Analysis of loans individually by classification of credit risk	500,000
Analysis of loans individually by classification of credit risk	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 loans not rated Pass.
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	143,960,000	110,989,000
Other | Farm Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	41,300,000	49,700,000
Other | State and Political Subdivision Obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	76,900,000	36,200,000
Other | Deposit Customer Overdraft
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$1,700,000	$2,200,000

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses - Allowance for Loan and Lease Losses (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				$56,851				$57,262	$56,851	$57,262	$34,749
Provision (reversal) for loan losses	-637	-1,332	1,404	-24	3,265	984	4,467	5,402	-589	14,118	24,491
Non-PCI loans charged-off									-9,202	-18,723	-5,744
Recoveries of non-PCI loans previously charged-off									3,151	4,194	3,766
Balance, end of period	50,211				56,851				50,211	56,851	57,262
PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				37,900				39,823	37,900	39,823	26,361
Provision (reversal) for loan losses									-9,044	-1,923	13,462
Non-PCI loans charged-off									0	0	0
Recoveries of non-PCI loans previously charged-off									0	0	0
Balance, end of period	28,856				37,900				28,856	37,900	39,823
Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				18,951				17,439	18,951	17,439	8,388
Provision (reversal) for loan losses									8,455	16,041	11,029
Non-PCI loans charged-off									-9,202	-18,723	-5,744
Recoveries of non-PCI loans previously charged-off									3,151	4,194	3,766
Balance, end of period	$21,355				$18,951				$21,355	$18,951	$17,439

Allowance_for_Loan_and_Lease_L3

Allowance for Loan and Lease Losses - Roll Forward of the Allowance for Loan and Lease Losses (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$56,851	$57,262	$34,749
Provision / (Reversals)	-589	14,118	24,491
Net (Charge-offs)/ Recoveries	-6,051	-14,529	-1,978
Balance, end of period	50,211	56,851	57,262
Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	14,730	18,539	12,800
Provision / (Reversals)	941	-4,543	4,415
Net (Charge-offs)/ Recoveries	-114	734	1,324
Balance, end of period	15,557	14,730	18,539
Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,763	11,545	9,620
Provision / (Reversals)	-1,012	11,296	1,619
Net (Charge-offs)/ Recoveries	255	-10,078	306
Balance, end of period	12,006	12,763	11,545
Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	28,275	26,492	11,557
Provision / (Reversals)	-1,248	5,366	17,786
Net (Charge-offs)/ Recoveries	-4,639	-3,583	-2,851
Balance, end of period	22,388	28,275	26,492
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,083	686	772
Provision / (Reversals)	730	1,999	671
Net (Charge-offs)/ Recoveries	-1,553	-1,602	-757
Balance, end of period	260	1,083	686
Non-owner occupied commercial real estate | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,635	3,764	3,854
Provision / (Reversals)	-2,620	1,305	-964
Net (Charge-offs)/ Recoveries	7	-434	874
Balance, end of period	2,022	4,635	3,764
Other commercial construction and land | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	8,217	12,711	7,627
Provision / (Reversals)	4,088	-5,593	4,625
Net (Charge-offs)/ Recoveries	-124	1,099	459
Balance, end of period	12,181	8,217	12,711
Multifamily commercial real estate | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	320	348	398
Provision / (Reversals)	-68	-69	-56
Net (Charge-offs)/ Recoveries	0	41	6
Balance, end of period	252	320	348
1-4 family residential construction and land | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,558	1,716	921
Provision / (Reversals)	-459	-186	810
Net (Charge-offs)/ Recoveries	3	28	-15
Balance, end of period	1,102	1,558	1,716
Owner occupied commercial real estate | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,450	4,055	5,454
Provision / (Reversals)	-1,767	1,169	-1,778
Net (Charge-offs)/ Recoveries	-179	-774	379
Balance, end of period	2,504	4,450	4,055
Commercial and industrial loans | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	8,310	7,490	4,166
Provision / (Reversals)	758	10,124	3,397
Net (Charge-offs)/ Recoveries	434	-9,304	-73
Balance, end of period	9,502	8,310	7,490
Lease financing | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3	0	0
Provision / (Reversals)	-3	3	0
Net (Charge-offs)/ Recoveries	0	0	0
Balance, end of period	0	3	0
1-4 family residential | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	21,724	15,740	7,252
Provision / (Reversals)	-6,245	5,896	8,441
Net (Charge-offs)/ Recoveries	-28	88	47
Balance, end of period	15,451	21,724	15,740
Home equity loans | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3,869	8,670	2,711
Provision / (Reversals)	466	-3,559	7,605
Net (Charge-offs)/ Recoveries	-1,520	-1,242	-1,646
Balance, end of period	2,815	3,869	8,670
Other consumer loans | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,682	2,082	1,594
Provision / (Reversals)	4,531	3,029	1,740
Net (Charge-offs)/ Recoveries	-3,091	-2,429	-1,252
Balance, end of period	$4,122	$2,682	$2,082

Allowance_for_Loan_and_Lease_L4

Allowance for Loan and Lease Losses - Roll Forward of the Allowance for Loan and Lease Losses at the PCI and Non-PCI Levels (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				$56,851				$57,262	$56,851	$57,262	$34,749
Total charge-offs									-9,202	-18,723	-5,744
Total recoveries									3,151	4,194	3,766
Net charge-offs									-6,051	-14,529	-1,978
Total provision (reversal) for loan and lease losses	-637	-1,332	1,404	-24	3,265	984	4,467	5,402	-589	14,118	24,491
Balance, end of period	50,211				56,851				50,211	56,851	57,262
Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				18,951				17,439	18,951	17,439	8,388
Total charge-offs									-9,202	-18,723	-5,744
Total recoveries									3,151	4,194	3,766
Net charge-offs									-6,051	-14,529	-1,978
Total provision (reversal) for loan and lease losses									8,455	16,041	11,029
Balance, end of period	21,355				18,951				21,355	18,951	17,439
PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				37,900				39,823	37,900	39,823	26,361
Total charge-offs									0	0	0
Total recoveries									0	0	0
Net charge-offs									0	0	0
Total provision (reversal) for loan and lease losses									-9,044	-1,923	13,462
Balance, end of period	28,856				37,900				28,856	37,900	39,823
Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				14,730				18,539	14,730	18,539	12,800
Total charge-offs									-523	-244	-302
Total recoveries									409	978	1,626
Total provision (reversal) for loan and lease losses									941	-4,543	4,415
Balance, end of period	15,557				14,730				15,557	14,730	18,539
Total Commercial Real Estate | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-523	-244	-302
Total recoveries									409	978	1,626
Total provision (reversal) for loan and lease losses									-44	-1,080	1,650
Total Commercial Real Estate | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									985	-3,463	2,765
Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				12,763				11,545	12,763	11,545	9,620
Total charge-offs									-715	-11,183	-421
Total recoveries									970	1,105	727
Total provision (reversal) for loan and lease losses									-1,012	11,296	1,619
Balance, end of period	12,006				12,763				12,006	12,763	11,545
Total Commercial | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-715	-11,183	-421
Total recoveries									970	1,105	727
Total provision (reversal) for loan and lease losses									125	10,707	3,619
Total Commercial | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-1,137	589	-2,000
Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				28,275				26,492	28,275	26,492	11,557
Total charge-offs									-5,599	-4,669	-3,233
Total recoveries									960	1,086	382
Total provision (reversal) for loan and lease losses									-1,248	5,366	17,786
Balance, end of period	22,388				28,275				22,388	28,275	26,492
Total Consumer | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-5,599	-4,669	-3,233
Total recoveries									960	1,086	382
Total provision (reversal) for loan and lease losses									6,953	4,720	4,683
Total Consumer | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-8,201	646	13,103
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				1,083				686	1,083	686	772
Total charge-offs									-2,365	-2,627	-1,788
Total recoveries									812	1,025	1,031
Total provision (reversal) for loan and lease losses									730	1,999	671
Balance, end of period	260				1,083				260	1,083	686
Other | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-2,365	-2,627	-1,788
Total recoveries									812	1,025	1,031
Total provision (reversal) for loan and lease losses									1,421	1,694	1,077
Other | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-691	305	-406
Non-owner occupied commercial real estate | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				4,635				3,764	4,635	3,764	3,854
Total charge-offs									-293	-92	-219
Total recoveries									300	-342	1,093
Total provision (reversal) for loan and lease losses									-2,620	1,305	-964
Balance, end of period	2,022				4,635				2,022	4,635	3,764
Non-owner occupied commercial real estate | Total Commercial Real Estate | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-293	-92	-219
Total recoveries									300	-342	1,093
Total provision (reversal) for loan and lease losses									-59	588	179
Non-owner occupied commercial real estate | Total Commercial Real Estate | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-2,561	717	-1,143
Other commercial construction and land | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				8,217				12,711	8,217	12,711	7,627
Total charge-offs									-224	-152	-83
Total recoveries									100	1,251	542
Total provision (reversal) for loan and lease losses									4,088	-5,593	4,625
Balance, end of period	12,181				8,217				12,181	8,217	12,711
Other commercial construction and land | Total Commercial Real Estate | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-224	-152	-83
Total recoveries									100	1,251	542
Total provision (reversal) for loan and lease losses									334	-1,708	842
Other commercial construction and land | Total Commercial Real Estate | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									3,754	-3,885	3,783
Multifamily commercial real estate | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				320				348	320	348	398
Total charge-offs									0	0	0
Total recoveries									0	41	6
Total provision (reversal) for loan and lease losses									-68	-69	-56
Balance, end of period	252				320				252	320	348
Multifamily commercial real estate | Total Commercial Real Estate | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	41	6
Total provision (reversal) for loan and lease losses									10	-53	115
Multifamily commercial real estate | Total Commercial Real Estate | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-78	-16	-171
1-4 family residential construction and land | Total Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				1,558				1,716	1,558	1,716	921
Total charge-offs									-6	0	0
Total recoveries									9	28	-15
Total provision (reversal) for loan and lease losses									-459	-186	810
Balance, end of period	1,102				1,558				1,102	1,558	1,716
1-4 family residential construction and land | Total Commercial Real Estate | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-6	0	0
Total recoveries									9	28	-15
Total provision (reversal) for loan and lease losses									-329	93	514
1-4 family residential construction and land | Total Commercial Real Estate | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-130	-279	296
Owner occupied commercial real estate | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				4,450				4,055	4,450	4,055	5,454
Total charge-offs									-211	-1,060	-50
Total recoveries									32	286	429
Total provision (reversal) for loan and lease losses									-1,767	1,169	-1,778
Balance, end of period	2,504				4,450				2,504	4,450	4,055
Owner occupied commercial real estate | Total Commercial | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-211	-1,060	-50
Total recoveries									32	286	429
Total provision (reversal) for loan and lease losses									-303	442	-421
Owner occupied commercial real estate | Total Commercial | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-1,464	727	-1,357
Commercial and industrial loans | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				8,310				7,490	8,310	7,490	4,166
Total charge-offs									-504	-10,123	-371
Total recoveries									938	819	298
Total provision (reversal) for loan and lease losses									758	10,124	3,397
Balance, end of period	9,502				8,310				9,502	8,310	7,490
Commercial and industrial loans | Total Commercial | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-504	-10,123	-371
Total recoveries									938	819	298
Total provision (reversal) for loan and lease losses									431	10,262	4,040
Commercial and industrial loans | Total Commercial | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									327	-138	-643
Lease financing | Total Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				3				0	3	0	0
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-3	3	0
Balance, end of period	0				3				0	3	0
Lease financing | Total Commercial | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-3	3	0
Lease financing | Total Commercial | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									0	0	0
1-4 family residential | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				21,724				15,740	21,724	15,740	7,252
Total charge-offs									-114	-40	-1,722
Total recoveries									86	128	47
Total provision (reversal) for loan and lease losses									-6,245	5,896	8,441
Balance, end of period	15,451				21,724				15,451	21,724	15,740
1-4 family residential | Total Consumer | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-114	-40	-1,722
Total recoveries									86	128	47
Total provision (reversal) for loan and lease losses									589	277	1,001
1-4 family residential | Total Consumer | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-6,834	5,619	7,440
Home equity loans | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				3,869				8,670	3,869	8,670	2,711
Total charge-offs									-1,740	-1,630	-1,511
Total recoveries									220	388	76
Total provision (reversal) for loan and lease losses									466	-3,559	7,605
Balance, end of period	2,815				3,869				2,815	3,869	8,670
Home equity loans | Total Consumer | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-1,740	-1,630	-1,511
Total recoveries									220	388	76
Total provision (reversal) for loan and lease losses									1,761	1,264	1,859
Home equity loans | Total Consumer | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									-1,295	-4,823	5,746
Other consumer loans | Total Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				2,682				2,082	2,682	2,082	1,594
Total charge-offs									-3,745	-2,999	0
Total recoveries									654	570	259
Total provision (reversal) for loan and lease losses									4,531	3,029	1,740
Balance, end of period	4,122				2,682				4,122	2,682	2,082
Other consumer loans | Total Consumer | Non-PCI Loans Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									-3,745	-2,999	0
Total recoveries									654	570	259
Total provision (reversal) for loan and lease losses									4,603	3,179	1,823
Other consumer loans | Total Consumer | PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Total charge-offs									0	0	0
Total recoveries									0	0	0
Total provision (reversal) for loan and lease losses									($72)	($150)	($83)

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 $)	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for impairment, unamortized purchase discounts (Premium)	$11,700,000		$14,700,000
Acquired Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Collectively Evaluated for Impairment	355,400,000		435,000,000
Non-PCI Loans Acquired
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	15,000		512,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	21,340,000		18,439,000
Allowance for Loan Losses, Purchased Credit-Impaired	28,856,000		37,900,000
Loans, Individually Evaluated for Impairment	7,418,000		15,824,000
Loans, Collectively Evaluated for Impairment	3,621,036,000	[1]	2,650,649,000	[2]
Loans, Purchased Credit-Impaired	1,366,249,000		1,877,544,000
Non-PCI Loans Acquired | 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	3,839,000		3,997,000
Allowance for Loan Losses, Purchased Credit-Impaired	11,718,000		10,733,000
Loans, Individually Evaluated for Impairment	0		877,000
Loans, Collectively Evaluated for Impairment	616,461,000	[1]	440,640,000	[2]
Loans, Purchased Credit-Impaired	540,640,000		773,749,000
Non-PCI Loans Acquired | Total Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		507,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,871,000		8,984,000
Allowance for Loan Losses, Purchased Credit-Impaired	2,135,000		3,272,000
Loans, Individually Evaluated for Impairment	6,127,000		14,467,000
Loans, Collectively Evaluated for Impairment	1,749,134,000	[1]	1,343,381,000	[2]
Loans, Purchased Credit-Impaired	367,271,000		506,712,000
Non-PCI Loans Acquired | Total Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	15,000		5,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,294,000		4,990,000
Allowance for Loan Losses, Purchased Credit-Impaired	15,079,000		23,280,000
Loans, Individually Evaluated for Impairment	1,291,000		207,000
Loans, Collectively Evaluated for Impairment	1,152,228,000	[1]	805,622,000	[2]
Loans, Purchased Credit-Impaired	417,591,000		547,373,000
Non-PCI Loans Acquired | Other
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	336,000		468,000
Allowance for Loan Losses, Purchased Credit-Impaired	-76,000		615,000
Loans, Individually Evaluated for Impairment	0		273,000
Loans, Collectively Evaluated for Impairment	103,213,000	[1]	61,006,000	[2]
Loans, Purchased Credit-Impaired	40,747,000		49,710,000
Non-PCI Loans Acquired | 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	1,563,000		1,615,000
Allowance for Loan Losses, Purchased Credit-Impaired	459,000		3,020,000
Loans, Individually Evaluated for Impairment	0		877,000
Loans, Collectively Evaluated for Impairment	431,345,000	[1]	286,685,000	[2]
Loans, Purchased Credit-Impaired	367,211,000		488,171,000
Non-PCI Loans Acquired | 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	1,411,000		1,201,000
Allowance for Loan Losses, Purchased Credit-Impaired	10,770,000		7,016,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	66,978,000	[1]	67,789,000	[2]
Loans, Purchased Credit-Impaired	133,777,000		232,705,000
Non-PCI Loans Acquired | 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	126,000		116,000
Allowance for Loan Losses, Purchased Credit-Impaired	126,000		204,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	60,092,000	[1]	29,187,000	[2]
Loans, Purchased Credit-Impaired	29,040,000		38,501,000
Non-PCI Loans Acquired | 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	739,000		1,065,000
Allowance for Loan Losses, Purchased Credit-Impaired	363,000		493,000
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	58,046,000	[1]	56,979,000	[2]
Loans, Purchased Credit-Impaired	10,612,000		14,372,000
Non-PCI Loans Acquired | Owner occupied commercial real estate | 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	2,129,000		2,611,000
Allowance for Loan Losses, Purchased Credit-Impaired	375,000		1,839,000
Loans, Individually Evaluated for Impairment	3,423,000		4,844,000
Loans, Collectively Evaluated for Impairment	780,427,000	[1]	686,409,000	[2]
Loans, Purchased Credit-Impaired	262,886,000		366,895,000
Non-PCI Loans Acquired | Commercial and industrial loans | Total Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		507,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,742,000		6,370,000
Allowance for Loan Losses, Purchased Credit-Impaired	1,760,000		1,433,000
Loans, Individually Evaluated for Impairment	2,704,000		9,623,000
Loans, Collectively Evaluated for Impairment	966,702,000	[1]	654,296,000	[2]
Loans, Purchased Credit-Impaired	104,385,000		139,817,000
Non-PCI Loans Acquired | 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		3,000
Allowance for Loan Losses, Purchased Credit-Impaired	0		0
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	2,005,000	[1]	2,676,000	[2]
Loans, Purchased Credit-Impaired	0		0
Non-PCI Loans Acquired | 1-4 family residential | Total Consumer
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	2,840,000		2,279,000
Allowance for Loan Losses, Purchased Credit-Impaired	12,611,000		19,445,000
Loans, Individually Evaluated for Impairment	745,000		0
Loans, Collectively Evaluated for Impairment	599,278,000	[1]	377,668,000	[2]
Loans, Purchased Credit-Impaired	320,159,000		418,642,000
Non-PCI Loans Acquired | Home equity loans | Total Consumer
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	639,000		398,000
Allowance for Loan Losses, Purchased Credit-Impaired	2,176,000		3,471,000
Loans, Individually Evaluated for Impairment	325,000		0
Loans, Collectively Evaluated for Impairment	286,589,000	[1]	270,170,000	[2]
Loans, Purchased Credit-Impaired	91,561,000		116,196,000
Non-PCI Loans Acquired | Other consumer loans | Total Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	15,000		5,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	3,815,000		2,313,000
Allowance for Loan Losses, Purchased Credit-Impaired	292,000		364,000
Loans, Individually Evaluated for Impairment	221,000		207,000
Loans, Collectively Evaluated for Impairment	266,361,000	[1]	157,784,000	[2]
Loans, Purchased Credit-Impaired	$5,871,000		$12,535,000
[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.
[2]	Loans collectively evaluated for impairment include $435.0 million of acquired loans which are presented net of unamortized purchase discounts of $14.7 million.

Allowance_for_Loan_and_Lease_L6

Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Loans modified in TDRs with recorded investments	$3.80	$1.20

FDIC_Indemnification_Asset_Sch

FDIC Indemnification Asset - Schedule of FDIC Indemnification Asset (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]
FDIC indemnification asset, beginning balance	$33,610	$49,417	$66,282
Indemnification asset income	-2,066	2,245	10,728
Amortization of indemnification asset	-9,465	-7,901	-9,403
Cash received on reimbursable losses	-5,317	-10,151	-18,190
FDIC indemnification asset, ending balance	$16,762	$33,610	$49,417

FDIC_Indemnification_Asset_Add

FDIC Indemnification Asset - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
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

Premises_and_Equipment_Summary

Premises and Equipment - Summary of the Cost and Accumulated Depreciation of Premises and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	245,414	239,700
Less: Accumulated depreciation	-72,238	-59,845
Premises and equipment, net	173,176	179,855
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	50,690	49,219
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	122,204	124,312
Buildings and leasehold improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful life	1 year
Buildings and leasehold improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful life		40 years
Furniture, fixture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	70,693	65,605
Furniture, fixture and equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful life	1 year
Furniture, fixture and equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful life		40 years
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,827	564

Premises_and_Equipment_Summary1

Premises and Equipment - Summary of Future Minimum Lease Payments (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
2015	$8,267
2016	7,586
2017	6,458
2018	5,555
2019	4,745
Thereafter	20,253
Operating Leases, Future Minimum Payments Due	$52,864

Premises_and_Equipment_Additio

Premises and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$13.40	$14.60	$13.10
Rent expense	$9.60	$10.30	$9.40
Minimum [Member]
Property, Plant and Equipment [Line Items]
Operating leases for office and banking premises expiry periods	6 months
Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating leases for office and banking premises expiry periods	18 years

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Summary of Changes in Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011
Goodwill [Line Items]
Goodwill beginning balance			$131,987	$115,960
Goodwill ending balance	134,522	131,987	131,987	115,960
Green Bankshares [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	2,535
Southern Community Financial Corporation [Member]
Goodwill [Line Items]
Out of period adjustment to goodwill		$16,027

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Summary of Changes in Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Impairment of wealth management intangible	$0	$0	($202)
Amortization	-4,303	-5,082	-4,718
Ending Balance	18,797
Core Deposit
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	23,051	28,043	25,649
Amortization	-4,390	-4,992	-4,466
Ending Balance	18,661	23,051	28,043
Core Deposit | Southern Community Financial Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Increase associated with acquisition			6,860
Trade Name
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	117	318	464
Impairment of wealth management intangible			-33
Amortization	-17	-201	-213
Ending Balance	100	117	318
Trade Name | Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Increase associated with acquisition			100
Customer Relationship
Finite-Lived Intangible Assets [Line Items]
Beginning Balance			191
Impairment of wealth management intangible			-169
Amortization			-22
Ending Balance	0	0
Mortgage Service Rights
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	197	275	388
Amortization	-61	-78	-113
Ending Balance	$136	$197	$275

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Summary of Estimated Intangible Asset Amortization Expense (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	$3,806
2016	3,733
2017	3,667
2018	3,604
2019	2,763
Thereafter	1,224
Total	$18,797

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$0	$0	$202
Customer Relationship
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets			169
Trade Name
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets			33
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets amortized as noninterest expense estimated lives	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets amortized as noninterest expense estimated lives	8 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of trademark	$100

Other_Real_Estate_Owned_Other_

Other Real Estate Owned - Other Real Estate Owned (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Real Estate [Roll Forward]
Balance, beginning of period	$129,396	$154,093	$168,781
OREO acquired through acquisitions			20,183
Real estate acquired from borrowers	34,970	69,403	84,556
Valuation allowance	-10,901	-22,034	-22,498
Properties sold	-75,839	-72,066	-96,929
Balance, end of period	$77,626	$129,396	$154,093

Other_Real_Estate_Owned_Additi

Other Real Estate Owned - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
Ending balances for OREO covered by FDIC	$15,700,000	$25,300,000	$35,900,000
Ending balances for OREO non-covered	61,900,000	104,100,000	118,200,000
Proceeds on sale of OREO	80,393,000	75,548,000	99,704,000
Gains (losses) on sales of OREO	4,555,000	3,482,000	3,801,000
Proceeds on sale of OREO, cash and noncash			$100,730,000

Time_Deposits_Summary_of_Contr

Time Deposits - Summary of Contractual Maturities of Time Deposits (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Time Deposits, Fiscal Year Maturity [Abstract]
2015	$785,398
2016	255,069
2017	258,163
2018	40,301
2019	77,959
Thereafter	27
Subtotal	1,416,917
Unamortized purchase accounting fair value premium	1,783
Total	$1,418,700	$1,447,497

Time_Deposits_Additional_Infor

Time Deposits - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Banking and Thrift, Interest [Abstract]
Time deposits of $100,000 or more	$592.10	$657.80

Federal_Home_Loan_Bank_Advance2

Federal Home Loan Bank Advances and Short-Term Borrowings - Federal Home Loan Bank Advance Owed (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	$296,091		$96,278
FHLB Advances With 0.36%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	105,000		95,000
Maturity Date	19-May-15		16-May-14
Interest Rate as of December 31, 2014	0.36%		0.36%
FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	40,000	[1]
Maturity Date	25-Nov-16	[1]
Interest Rate as of December 31, 2014	0.25%	[1]
Interest rate, basis points	2.00%	[1]
FHLB Advances With 0.50%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	578		724
Maturity Date	6-Nov-17		6-Nov-17
Interest Rate as of December 31, 2014	0.50%		0.50%
FHLB Advances With 0.25%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]
Maturity Date	20-Nov-17	[1]
Interest Rate as of December 31, 2014	0.25%	[1]
Interest rate, basis points	2.00%	[1]
FHLB Advances With 0.26%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]
Maturity Date	23-Nov-18	[1]
Interest Rate as of December 31, 2014	0.26%	[1]
Interest rate, basis points	2.00%	[1]
FHLB Advances With 0.21%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	50,000	[1]
Maturity Date	31-Dec-19	[1]
Interest Rate as of December 31, 2014	0.21%	[1]
Interest rate, basis points	2.00%	[1]
FHLB Advances With 0.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Contractual Outstanding Amount	$513		$554
Maturity Date	10-Feb-26		10-Feb-26
Interest Rate as of December 31, 2014	0.00%		0.00%
[1]	FRC =HLB Fixed Rate Credit interest rate.

Federal_Home_Loan_Bank_Advance3

Federal Home Loan Bank Advances and Short-Term Borrowings - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Short-term borrowings	$23,407,000	$24,850,000
Amounts of eligible collateral provided for incremental borrowing	247,700,000	95,400,000
Letters of credit issued by the FHLB	25,700,000	25,600,000
Letter of credit used as collateral in lieu of pledging securities	$25,200,000

LongTerm_Borrowings_Schedule_o

Long-Term Borrowings - Schedule of Outstanding Structured Repurchase Agreements (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	$52,526	$53,449
Contractual Amount	50,000
4.75%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,540	10,823
Contractual Amount	10,000
Maturity Date	6-Nov-16
Contractual Rate	4.75%
4.50%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,582	10,833
Contractual Amount	10,000
Maturity Date	30-Mar-17
Contractual Rate	4.50%
3.79%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,394	10,521
Contractual Amount	10,000
Maturity Date	18-Dec-17
Contractual Rate	3.79%
3.72%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,372	10,492
Contractual Amount	10,000
Maturity Date	18-Dec-17
Contractual Rate	3.72%
3.56%
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Amount	10,638	10,780
Contractual Amount	$10,000
Maturity Date	22-Mar-19
Contractual Rate	3.56%

LongTerm_Borrowings_Summary_of

Long-Term Borrowings - Summary of Subordinated Debentures (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Face amount	$151,000
Carrying amount	83,621	81,557
Subordinated Debt 3 Point 81%
Debt Instrument [Line Items]
Date of offering	31-Jul-01
Face amount	5,000
Carrying amount	3,900	3,851
Debt Instrument, variable interest rate	3.81%
Subordinated debt variable interest rate, basis points	3.58%
Maturity date	31-Jul-31
Subordinated Debt 3 Point 81%
Debt Instrument [Line Items]
Date of offering	31-Jul-01
Face amount	4,000
Carrying amount	2,699	2,636
Debt Instrument, variable interest rate	3.81%
Subordinated debt variable interest rate, basis points	3.58%
Maturity date	31-Jul-31
Subordinated Debt 3 Point 35%
Debt Instrument [Line Items]
Date of offering	26-Jun-03
Face amount	10,000
Carrying amount	6,017	5,921
Debt Instrument, variable interest rate	3.35%
Subordinated debt variable interest rate, basis points	3.10%
Maturity date	26-Jun-33
Subordinated Debt 3 Point 08%
Debt Instrument [Line Items]
Date of offering	25-Sep-03
Face amount	10,000
Carrying amount	6,516	6,368
Debt Instrument, variable interest rate	3.08%
Subordinated debt variable interest rate, basis points	2.85%
Maturity date	8-Oct-33
Subordinated Debt 3 Point 08%
Debt Instrument [Line Items]
Date of offering	30-Dec-03
Face amount	10,000
Carrying amount	5,802	5,704
Debt Instrument, variable interest rate	3.08%
Subordinated debt variable interest rate, basis points	2.85%
Maturity date	30-Dec-33
Subordinated Debt 1 Point 92%
Debt Instrument [Line Items]
Date of offering	28-Jun-05
Face amount	3,000
Carrying amount	1,594	1,545
Debt Instrument, variable interest rate	1.92%
Subordinated debt variable interest rate, basis points	1.68%
Maturity date	28-Jun-35
Subordinated Debt 1 Point 64%
Debt Instrument [Line Items]
Date of offering	22-Dec-05
Face amount	10,000
Carrying amount	4,607	4,491
Debt Instrument, variable interest rate	1.64%
Subordinated debt variable interest rate, basis points	1.40%
Maturity date	15-Mar-36
Subordinated Debt 1 Point 78%
Debt Instrument [Line Items]
Date of offering	28-Dec-05
Face amount	13,000
Carrying amount	6,668	6,458
Debt Instrument, variable interest rate	1.78%
Subordinated debt variable interest rate, basis points	1.54%
Maturity date	15-Mar-36
Subordinated Debt 1 Point 78%
Debt Instrument [Line Items]
Date of offering	23-Jun-06
Face amount	20,000
Carrying amount	11,488	11,206
Debt Instrument, variable interest rate	1.78%
Subordinated debt variable interest rate, basis points	1.55%
Maturity date	7-Jul-36
Subordinated Debt 1 Point 89%
Debt Instrument [Line Items]
Date of offering	16-May-07
Face amount	56,000
Carrying amount	28,904	28,050
Debt Instrument, variable interest rate	1.89%
Subordinated debt variable interest rate, basis points	1.65%
Maturity date	15-Jun-37
Subordinated Debt 1 Point 67%
Debt Instrument [Line Items]
Date of offering	15-Jun-07
Face amount	10,000
Carrying amount	$5,426	$5,327
Debt Instrument, variable interest rate	1.67%
Subordinated debt variable interest rate, basis points	1.43%
Maturity date	6-Sep-37

LongTerm_Borrowings_Schedule_o1

Long-Term Borrowings- Schedule of Maturities of Long-Term Borrowings (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Due in 2015	$0
Due in 2016	10,540
Due in 2017	31,348
Due in 2018	0
Due in 2019	10,638
Thereafter	87,155
Total	139,681	138,561
Fixed Rate
Debt Instrument [Line Items]
Due in 2015	0
Due in 2016	10,540
Due in 2017	31,348
Due in 2018	0
Due in 2019	10,638
Thereafter	3,534
Total	56,060
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	83,621
Total	$83,621

LongTerm_Borrowings_Additional

Long-Term Borrowings - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 18, 2013	Sep. 07, 2013
	Trust_Preferred_Securities
Debt Instrument [Line Items]
Number of trust preferred securities acquired	13
Life of debt securities and trust preferred securities	30 years
Period allowed for deferral of interest payment on the trust preferred securities	60 months
Gain (loss) on extinguishment of debt	$0	$122,000	($3,267,000)
Subordinated promissory notes, due date	18-Mar-20
Carrying value of promissory notes	3,500,000	3,600,000
Subordinated Debt With Fixed 10% Interest Rate
Debt Instrument [Line Items]
Fixed interest rate	10.00%
Subordinated promissory notes	3,400,000
Trust Preferred Securities
Debt Instrument [Line Items]
Redeemed securities issued				34,500,000
Fixed interest rate				7.95%
Gain (loss) on extinguishment of debt				-300,000
Trust Preferred Securities | Subordinated Debt 1
Debt Instrument [Line Items]
Redeemed securities issued					8,000,000
Fixed interest rate					10.60%
Gain (loss) on extinguishment of debt					400,000
Collateralized Mortgage-Backed Securities
Debt Instrument [Line Items]
Weighted-average rate of repurchase agreements	4.06%	4.06%
Collateralized mortgage-backed securities	$61,400,000	$62,100,000

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plan [Line Items]
Employee eligible pretax salary contribution, minimum		1.00%
Employee eligible pretax salary contribution, maximum		90.00%
Employee and discretionary matching contribution portion vested		100.00%
Discretionary matching contributions expensed	$0.40	$0.40	$0.40
Accrued for deferred compensation plan	6.7	7.5
Nonqualified retirement benefit plan	-0.8	0.4	0.5
Cash surrender value, net of related insurance expense	55.2	53.6
Cash value income related policies	1.6	1.6	0.9
Defined benefit plan, Unfunded status of plan	0.2
Defined benefit plan, Benefit obligation	1.3
Defined benefit plan, Fair value of plan assets	1.1
Nonqualified Excess Plan [Member]
Employee Benefit Plan [Line Items]
Accrued for deferred compensation plan	0.7	0.2
Nonqualified retirement benefit plan	$0.50	$0.20

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Components and Classification of Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$2,642	$5,439	$18,681
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	764	571	9,763
Restricted Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,878	4,868	8,918
Salaries and employee benefits
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,642	5,439	17,384
Other expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$0	$0	$1,297

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Weighted Average Assumptions to Compute the Grant-Date Fair Value of Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Dividend yield	0.00%	0.00%
Risk-free interest rate	1.00%	0.91%
Expected option life	5 years 9 months	5 years 3 months 0 days
Volatility	37.00%	45.00%
Weighted average grant-date fair value of options granted	$6.52	$8.05

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance, shares	3,124	2,890	2,236
Granted, shares	0	264	657
Exercised, shares	0	0	0
Canceled, expired or forfeited, shares	-13	-30	-3
Ending Balance, shares	3,111	3,124	2,890
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, weighted average exercise price per share (in dollars per share)	$20.50	$21.39	$20
Stock option grants, exercise price	$0	$18	$27.17
Exercised, weighted average exercise price per share (in dollars per share)	$0	$0	$0
Canceled, expired or forfeited, weighted average exercise price per share (in dollars per share)	$80.99	$83.28	$276.34
Ending balance, weighted average exercise price per share (in dollars per share)	$20.26	$20.50	$21.39

StockBased_Compensation_Summar3

Stock-Based Compensation - Summary of Options Outstanding (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Remaining contractual life	5 years 6 months 15 days
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options, shares	236
Remaining contractual life	8 years 4 months 19 days
Outstanding options, weighted average exercise price per share	18
Exercisable options, shares	122
Price per share	18
Exercise price	18
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options, shares	2,864
Remaining contractual life	5 years 5 months 6 days
Outstanding options, weighted average exercise price per share	20
Exercisable options, shares	2,864
Price per share	20
Exercise price	20
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options, shares	11
Remaining contractual life	3 years 3 months 12 days
Outstanding options, weighted average exercise price per share	139.44
Exercisable options, shares	11
Price per share	139.44
Exercise prices, lower range limit	28.44
Exercise prices, upper range limit	2,026
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options, shares	3,111
Remaining contractual life	5 years 7 months 25 days
Outstanding options, weighted average exercise price per share	20.26
Exercisable options, shares	2,997
Price per share	20.35
Exercise prices, lower range limit	18
Exercise prices, upper range limit	2,026

StockBased_Compensation_Summar4

Stock-Based Compensation - Summary of Unvested Restricted Stock Awards (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance, shares	1,215	1,211	967
Granted, shares	0	4	307
Vested or released, shares	-405	0	-63
Canceled, expired or forfeited, shares	0	0	0
Ending balance, shares	810	1,215	1,211
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, weighted average grant date fair value (in dollars per share)	$14.28	$14.27	$13.26
Granted, weighted average grant date fair value (in dollars per share)	$0	$18	$18.01
Vested or released, weighted average grant date fair value (in dollars per share)	$15.07	$0	$17
Canceled, expired or forfeited, weighted average grant date fair value (in dollars per share)	$0	$0	$0
Ending balance, weighted average grant date fair value (in dollars per share)	$13.89	$14.28	$14.27

StockBased_Compensation_Summar5

Stock-Based Compensation - Summary of Stock Option Grants under 2010 Plan (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options exercised after ten years	0	264	657
Stock option grants, exercise price	$0	$18	$27.17
Weighted average grant-date fair value of options granted		$6.52	$8.05
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option grants, exercise price		$18

StockBased_Compensation_Summar6

Stock-Based Compensation - Summary of Restricted Stock Award under 2010 Plan (Detail) (Restricted Stock Awards [Member], 2010 and 2013 Plan [Member])	12 Months Ended
	Dec. 31, 2013
Restricted Stock Awards [Member] | 2010 and 2013 Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of Restricted Stock Awards	307,000

StockBased_Compensation_Summar7

Stock-Based Compensation - Summary of Weighted Average Assumptions to Compute the Grant-Date Fair Value of Options, Restricted Stock Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of the Company's common shares	$6.52	$8.05
Volatility	37.00%	45.00%
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of the Company's common shares	$18	$19.84
Risk-free interest rate	Forward Treasury Curve	Forward Treasury Curve
Market risk premium		0.00%
Annual forfeiture estimate		0.00%
Weighted average grant-date fair value of restricted stock awards granted	$18	$18.01
Restricted Stock Awards [Member] | 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		45.00%

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 02, 2014	Dec. 31, 2014	Jun. 05, 2014	21-May-13
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Tax benefit related to stock-based compensation expense	$1,000,000	$2,100,000	$7,300,000
Stock option grants, exercise price	$0	$18	$27.17
Outstanding options, weighted average remaining contractual life	5 years 6 months 15 days
Aggregate intrinsic value for stock options outstanding	21,600,000				21,600,000
Aggregate intrinsic value for stock options exercisable	20,500,000				20,500,000
Trading period for determining stock price	30 days
Restricted stock granted to directors	0	4,000	307,000
Compensation expense for stock awards	2,642,000	5,439,000	18,681,000
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	300,000				300,000
Stock options granted		264,000
Stock option grants, exercise price		$18
Stock option average period vested	5 months	2 years	6 months
Compensation expense for stock awards	764,000	571,000	9,763,000
Stock Options | Tranche One
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options granted			631,000
Stock option grants, exercise price			$20
Stock Options | Tranche Two
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options granted			26,000
Exercise prices, lower range limit			$28.44
Exercise prices, upper range limit			$2,026
Restricted Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	700,000				700,000
Restricted stock price				$25
Stock award vested during period				405,133
Excess tax benefits related to restricted stock awards					1,700,000
Compensation expense for stock awards	1,878,000	4,868,000	8,918,000
Restricted Stock Awards | Vesting Goal One
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$25
Restricted Stock Awards | Vesting Goal Two
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$28
Restricted Stock Awards | Vesting Goal Three
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock price	$32
2013 Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity incentive plan effective date	22-May-13
Equity incentive plan expiration date	22-May-23
2013 Plan | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares to be awarded under the plan	2,639,000				2,639,000
2013 Plan | Restricted Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock granted to directors	0
2013 Plan | Stock Award | Directors
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock granted to directors						11,880
Compensation expense for stock awards						$300,000
2010 And 2013 Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options granted	0				0
2010 And 2013 Plan | Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Exercise price for common stock as a percentage of fair value	100.00%
Options exercised after ten years	0				0
2010 And 2013 Plan | Stock Options | 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	110.00%
Stock ownership percentage for 110% exercise price	10.00%
2010 And 2013 Plan | Stock Options | Maximum | 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock award exercise expiration period from grant date	10 years
2010 And 2013 Plan | Stock Options | Minimum | 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock award exercise expiration period from grant date	5 years
2010 Plan | Restricted Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock granted to directors							4,000
Plan | Restricted Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of stock awards granted during period		307,000

Shareholders_Equity_and_Minimu2

Shareholders' Equity and Minimum Regulatory Capital Requirements - Minimum Ratios Along with the Actual Ratios for the Company and the Bank (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Consolidated
Tier One Leverage Capital [Abstract]
Adequately capitalized requirement tier 1 capital to average assets, amount	$261,445,000	$254,126,000
Actual tier 1 capital to average assets	933,335,000	949,619,000
Tier One Risk Based Capital [Abstract]
Adequately capitalized requirement tier 1 capital to risk weighted assets, amount	207,370,000	192,428,000
Actual tier 1 capital to risk weighted assets, amount	933,335,000	949,619,000
Capital [Abstract]
Adequately capitalized requirement total capital to risk weighted assets, amount	414,740,000	384,856,000
Actual total capital to risk weighted assets, amount	987,535,000	1,010,422,000
Risk Based Ratios [Abstract]
Adequately capitalized requirement, tier 1 capital to average assets (greater than or equal to)	4.00%	4.00%
Adequately capitalized requirement, tier 1 capital to risk weighted assets (greater than or equal to)	4.00%	4.00%
Adequately capitalized requirement, total capital to risk weighted assets (greater than or equal to)	8.00%	8.00%
Leverage Ratios [Abstract]
Actual tier 1 capital to average assets	14.30%	14.90%
Actual tier 1 capital to risk weighted assets	18.00%	19.70%
Actual tier 1 capital to total capital to risk weighted assets	19.10%	21.00%
Capital Bank, NA
Tier One Leverage Capital [Abstract]
Well capitalized requirement tier 1 capital to average assets, amount	326,050,000	317,562,000
Adequately capitalized requirement tier 1 capital to average assets, amount	260,840,000	254,050,000
Actual tier 1 capital to average assets	881,395,000	849,520,000
Tier One Risk Based Capital [Abstract]
Well capitalized requirement tier 1 capital to risk weighted assets, amount	310,245,000	288,410,000
Adequately capitalized requirement tier 1 capital to risk weighted assets, amount	206,830,000	192,273,000
Actual tier 1 capital to risk weighted assets, amount	881,395,000	849,520,000
Capital [Abstract]
Well capitalized requirement total capital to risk weighted assets, amount	517,074,000	480,683,000
Adequately capitalized requirement total capital to risk weighted assets, amount	413,660,000	384,546,000
Actual total capital to risk weighted assets, amount	$935,455,000	$910,162,000
Risk Based Ratios [Abstract]
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 capital to risk weighted assets (greater than or equal to)	6.00%	6.00%
Adequately capitalized requirement, tier 1 capital to risk weighted assets (greater than or equal to)	4.00%	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 [Abstract]
Actual tier 1 capital to average assets	13.50%	13.40%
Actual tier 1 capital to risk weighted assets	17.00%	17.70%
Actual tier 1 capital to total capital to risk weighted assets	18.10%	18.90%

Shareholders_Equity_and_Minimu3

Shareholders' Equity and Minimum Regulatory Capital Requirements - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended		24 Months Ended	0 Months Ended
	Jul. 08, 2014	Sep. 05, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Jan. 30, 2015	Aug. 31, 2010
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Period of retained net profits			2 years
Approved dividend	$56,000,000	$105,000,000
Authorize stock repurchase, maximum amount					200,000,000
Common shares repurchased during the period, amount			103,228,000	69,962,000
Share Repurchase Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common shares repurchased during the period, amount			103,200,000			173,200,000
Common shares repurchased during the period, shares			4,324,382			8,085,699
Average price of common shares			$23.87			$21.42
Remaining availability for future share repurchases under the current authorization			26,800,000		26,800,000	26,800,000
Capital Bank, NA
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital equal to risk - weighted assets			18.10%	18.90%	18.10%	18.10%
Tier 1 capital equal to risk - weighted assets			17.00%	17.70%	17.00%	17.00%
Minimum leverage ratio of (Tier 1 Capital ratio)			13.50%	13.40%	13.50%	13.50%
Prohibited period for payment of dividend			3 years
Capital Bank, NA | Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital equal to risk - weighted assets								12.00%
Tier 1 capital equal to risk - weighted assets								11.00%
Minimum leverage ratio of (Tier 1 Capital ratio)								10.00%
Subsequent Event
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Approved dividend							$199,400,000

Income_Taxes_Income_Tax_Expens

Income Taxes - Income Tax Expense (Benefit) from Continuing Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax (benefit) expense:
Federal	($2,629)	$0	$0
State	2,024	376	0
Current income tax expense (benefit)	-605	376	0
Deferred income tax expense (benefit):
Federal	29,291	23,260	-19,373
State	2,005	3,734	-2,169
Deferred income tax expense (benefit)	31,296	26,994	-21,542
Total income tax expense	$30,691	$27,370	($21,542)

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Income Tax Computed at Applicable Federal Statutory Income Tax Rates to Total Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before income taxes	$81,609	$66,214	$33,483
Income taxes computed at Federal statutory tax rate	28,563	23,175	11,719
Effect of:
State taxes (net of federal benefit)	2,720	2,532	1,280
State statutory rate change	421	1,545	0
Transactions and legal costs			615
Tax-exempt interest income, net	-1,247	-681	-715
Change in estimate of deductible loan losses			-33,975
Contingent value right expense (CVR)	597	1,192	0
Other, net	-363	-393	-466
Total income tax expense	$30,691	$27,370	($21,542)

Income_Taxes_Details_of_Net_De

Income Taxes - Details of Net Deferred Tax Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Loan basis differences	$35,590	$57,279
Net operating loss and AMT carryforwards	33,937	46,528
OREO basis differences	43,724	40,807
Allowance for loan and lease losses	19,151	22,081
Stock based compensation	10,821	12,828
Employee compensation and retirement benefits	2,515	2,898
Goodwill	1,605	1,854
CD premium	6,888	9,857
Net unrealized losses on AFS investments securities	3,171	4,736
Other	3,197	300
Deferred Tax Assets, Gross	160,599	199,168
Deferred tax liabilities:
FDIC indemnification asset	-6,393	-11,702
Borrowings	-12,969	-10,243
Depreciation	-1,219	-2,579
Deferred loan costs	-5,730	-3,375
Other intangibles	-1,595	-526
Other	-3,069	-3,981
Total gross deferred tax liabilities	-30,975	-32,406
Net deferred tax asset	129,624	166,762
Valuation allowance	0	0
Net deferred tax asset	$129,624	$166,762

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Uncertain tax positions	$0	$0
Income tax expense adjustment		1,500,000
Deferred income tax asset, net	129,624,000	166,762,000
Operating loss carryforwards	91,100,000	103,700,000
Net operating loss carryforward expiration date	2029
Estimated amount of annual commutative limitations	10,900,000
Unrecognized tax benefits	$0	$0

Loan_Commitments_and_Other_Rel2

Loan Commitments and Other Related Activity - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Contractual Obligation [Line Items]
Commitments to make loans	$77,592
Unfunded commitments under lines of credit	1,031,808
Total Commitments	1,109,400
Fixed Rate [Member]
Contractual Obligation [Line Items]
Commitments to make loans	65,522
Unfunded commitments under lines of credit	177,687
Total Commitments	243,209
Variable Rate [Member]
Contractual Obligation [Line Items]
Commitments to make loans	12,070
Unfunded commitments under lines of credit	854,121
Total Commitments	$866,191

Loan_Commitments_and_Other_Rel3

Loan Commitments and Other Related Activity - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Performance Letters of Credit [Member]
Contractual Obligation [Line Items]
Letters of credit	32.4
Financial Letters of Credit [Member]
Contractual Obligation [Line Items]
Letters of credit	27.6
Minimum [Member]
Contractual Obligation [Line Items]
Period of commitments to make loans	30 days
Maximum [Member]
Contractual Obligation [Line Items]
Period of commitments to make loans	90 days
Commitments to Make Loans [Member] | Minimum [Member]
Contractual Obligation [Line Items]
Loans commitments fixed interest rate	1.85%
Loans commitments maturity period	1 year
Commitments to Make Loans [Member] | Maximum [Member]
Contractual Obligation [Line Items]
Loans commitments fixed interest rate	13.00%
Loans commitments maturity period	10 years

Fair_Value_Assets_and_Liabilit

Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Trading securities	$2,410	$6,348
Available-for-sale securities:
Available-for-sale securities	555,893	685,441
Asset-backed securities
Available-for-sale securities:
Available-for-sale securities		133,225
Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	3,690	3,859
Marketable equity securities
Available-for-sale securities:
Available-for-sale securities		931
Collateralized debt obligations
Available-for-sale securities:
Available-for-sale securities		800
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Trading securities	0	4,477
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	2,410	1,871
Available-for-sale securities:
Available-for-sale securities	552,203	681,582
Gross asset value of derivatives	4	15
Liabilities
Gross liability value of derivatives	26	1,330
Significant Unobservable Inputs (Level 3)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	3,690	3,859
Gross asset value of derivatives	0	0
Liabilities
Gross liability value of derivatives	0	0
Fair Value on Recurring Basis
Assets
Trading securities	2,410	6,348
Available-for-sale securities:
Available-for-sale securities	555,893	685,441
Gross asset value of derivatives	4	15
Liabilities
Gross liability value of derivatives	26	1,330
Fair Value on Recurring Basis | Asset-backed securities
Available-for-sale securities:
Available-for-sale securities		133,225
Fair Value on Recurring Basis | Mortgage-Backed Securities-Residential
Available-for-sale securities:
Available-for-sale securities	552,203	546,626
Fair Value on Recurring Basis | Industrial revenue bonds
Available-for-sale securities:
Available-for-sale securities	3,690	3,859
Fair Value on Recurring Basis | Marketable equity securities
Available-for-sale securities:
Available-for-sale securities	0	931
Fair Value on Recurring Basis | Collateralized debt obligations
Available-for-sale securities:
Available-for-sale securities		800
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Trading securities	0	4,477
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) | Asset-backed securities
Available-for-sale securities:
Available-for-sale securities		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) | Marketable equity securities
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) | Collateralized debt obligations
Available-for-sale securities:
Available-for-sale securities		0
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets
Trading securities	2,410	1,871	[1]
Available-for-sale securities:
Available-for-sale securities	552,203	681,582
Gross asset value of derivatives	4	15
Liabilities
Gross liability value of derivatives	26	1,330
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Available-for-sale securities:
Available-for-sale securities		133,225
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities-Residential
Available-for-sale securities:
Available-for-sale securities	552,203	546,626
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) | Marketable equity securities
Available-for-sale securities:
Available-for-sale securities	0	931	[1]
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Collateralized debt obligations
Available-for-sale securities:
Available-for-sale securities		800
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets
Trading securities	0	0
Available-for-sale securities:
Available-for-sale securities	3,690	3,859
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) | Asset-backed securities
Available-for-sale securities:
Available-for-sale securities		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	3,690	3,859
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Marketable equity securities
Available-for-sale securities:
Available-for-sale securities	0	0
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Collateralized debt obligations
Available-for-sale securities:
Available-for-sale securities		$0
[1]	Transferred from Level 1 to Level 2 due to limited observable market data.

Fair_Value_Fair_Value_Measurem

Fair Value - Fair Value Measurements on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (Significant Unobservable Inputs (Level 3), Fair Value on Recurring Basis, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		$26
Included in earnings-gain on sales		199
Included in other comprehensive income		0
Sales		-225
Ending balance		0
Industrial revenue bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,859	3,800
Included in earnings-gain on sales		0
Principal reduction	-170
Included in other comprehensive income	1	59
Sales		0
Ending balance	3,690	3,859
Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		297
Included in earnings-gain on sales		0
Included in other comprehensive income		503
Sales		0
Transfer out of Level 3		-800
Ending balance		$0

Fair_Value_Quantitative_Inform

Fair Value - Quantitative Information About Recurring Level 3 Fair Value Measurements (Detail) (Significant Unobservable Inputs (Level 3), USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$5,403,670	$5,342,254
Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$3,690	$3,859
Illiquidity factor	0.50%	0.50%
Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount Rate	3.50%	3.70%
Fair Value on Recurring Basis | Industrial revenue bonds | Discounted Cash Flow | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount Rate	3.60%	3.90%

Fair_Value_Assets_and_Liabilit1

Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$77,626	$129,396	$154,093	$168,781
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	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	0	0
Other repossessed assets	150	108
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	66,048	118,579
Other repossessed assets	0	0
Impaired loans	$754	$1,332

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers of assets and liabilities between levels of the fair value	$0
Other real estate owned	77,626,000	129,396,000	154,093,000	168,781,000
Other real estate valuation allowance	10,901,000	22,034,000	22,498,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned	85,100,000	138,400,000
Other real estate valuation allowance	$19,100,000	$19,800,000

Fair_Value_Quantitative_Inform1

Fair Value - Quantitative Information About Nonrecurring Level 3 Fair Value Measurements (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$77,626	129,396	$154,093	$168,781
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	66,048	118,579
Impaired loans	754	1,332
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]
Other real estate owned	66,048	118,579
Appraised value less costs to sell	7.86%
Other real estate owned | Minimum | 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]
Appraised value less costs to sell		7.00%
Other real estate owned | Maximum | 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]
Appraised value less costs to sell		10.00%
Impaired Loans Commercial And Residential [Member] | 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]
Impaired loans	$754	1,332
Appraised value less costs to sell	7.60%
Impaired Loans Commercial And Residential [Member] | Minimum | 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]
Appraised value less costs to sell		8.00%

Fair_Value_Carrying_Amounts_an

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financial Assets
Trading securities	$2,410		$6,348
Investment securities available-for-sale	555,893		685,441
Investment securities held-to-maturity	443,379		459,693
FDIC indemnification asset	16,762		33,610		49,417	66,282
Financial Liabilities
Contractual deposits	1,418,700		1,447,497
Federal Home Loan Bank advances	296,091		96,278
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Cash and cash equivalents	188,135		164,441
Trading securities	0		4,477
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	188,135		168,918
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	2,410		1,871
Investment securities available-for-sale	552,203		681,582
Investment securities held-to-maturity	443,379		459,693
Loans, net	5,516		8,012
FDIC indemnification asset	0		0
Receivable from FDIC	3,661		7,624
Other earning assets	0	[1]	0	[1]
Gross asset value of derivatives	4		15
Total financial assets	1,007,173		1,158,797
Financial Liabilities
Non-contractual deposits	0		0
Contractual deposits	0		0
Federal Home Loan Bank advances	296,038		96,241
Short-term borrowings	23,407		24,850
Long-term borrowings	0		0
Subordinated debentures	0		0
Gross liability value of derivatives	26		1,330
Total financial liabilities	319,471		122,421
Significant Unobservable Inputs (Level 3)
Financial Assets
Cash and cash equivalents	0		0
Trading securities	0		0
Investment securities available-for-sale	3,690		3,859
Investment securities held-to-maturity	0		0
Loans, net	5,052,836		4,673,542
FDIC indemnification asset	16,762		33,610
Receivable from FDIC	0		0
Other earning assets	50,943	[1]	44,088	[1]
Gross asset value of derivatives	0		0
Total financial assets	5,124,231		4,755,099
Financial Liabilities
Non-contractual deposits	3,836,400		3,737,566
Contractual deposits	1,415,122		1,448,032
Federal Home Loan Bank advances	0		0
Short-term borrowings	0		0
Long-term borrowings	54,235		55,861
Subordinated debentures	97,913		100,795
Gross liability value of derivatives	0		0
Total financial liabilities	5,403,670		5,342,254
Carrying Value
Financial Assets
Cash and cash equivalents	188,135		164,441
Trading securities	2,410		6,348
Investment securities available-for-sale	555,893		685,441
Investment securities held-to-maturity	436,962		465,098
Loans, net	4,950,008		4,495,178
FDIC indemnification asset	16,762		33,610
Receivable from FDIC	3,661		7,624
Other earning assets	50,943	[1]	44,088	[1]
Gross asset value of derivatives	4		15
Total financial assets	6,204,778		5,901,843
Financial Liabilities
Non-contractual deposits	3,836,400		3,737,566
Contractual deposits	1,418,700		1,447,497
Federal Home Loan Bank advances	296,091		96,278
Short-term borrowings	23,407		24,850
Long-term borrowings	52,526		53,449
Subordinated debentures	87,155		85,112
Gross liability value of derivatives	26		1,330
Total financial liabilities	5,714,305		5,446,082
Estimated Fair Value
Financial Assets
Cash and cash equivalents	188,135		164,441
Trading securities	2,410		6,348
Investment securities available-for-sale	555,893		685,441
Investment securities held-to-maturity	443,379		459,693
Loans, net	5,058,352		4,681,554
FDIC indemnification asset	16,762		33,610
Receivable from FDIC	3,661		7,624
Other earning assets	50,943	[1]	44,088	[1]
Gross asset value of derivatives	4		15
Total financial assets	6,319,539		6,082,814
Financial Liabilities
Non-contractual deposits	3,836,400		3,737,566
Contractual deposits	1,415,122		1,448,032
Federal Home Loan Bank advances	296,038		96,241
Short-term borrowings	23,407		24,850
Long-term borrowings	54,235		55,861
Subordinated debentures	97,913		100,795
Gross liability value of derivatives	26		1,330
Total financial liabilities	$5,723,141		$5,464,675
[1]	Includes Federal Reserve Bank, Federal Home Loan Bank and Bankers Bank stock

Derivative_Instrument_Summary_

Derivative Instrument - Summary of Derivative Instrument Contracts Fair Value and Notional Amount (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Derivative [Line Items]
Derivative, Notional Amount	$1,640	$16,715
Assets | Interest rate cap contracts (matured in 2014)
Derivative [Line Items]
Derivative, Fair Value	0	0
Derivative, Notional Amount	0	12,500
Assets | Forward loan sales contracts (maturing in 2015 and 2014, respectively)
Derivative [Line Items]
Derivative, Fair Value	4	15
Derivative, Notional Amount	1,640	4,215
Liabilities
Derivative [Line Items]
Derivative, Notional Amount	7,578	28,545
Liabilities | Interest rate swaps associated with certificates of deposits (terminated in 2014)
Derivative [Line Items]
Derivative, Fair Value	0	1,320
Derivative, Notional Amount	0	25,000
Liabilities | Forward loan sales contracts (maturing in 2015 and 2014, respectively)
Derivative [Line Items]
Derivative, Fair Value	26	10
Derivative, Notional Amount	7,578	3,545
Significant Other Observable Inputs (Level 2)
Derivative [Line Items]
Gross asset value of derivatives	4	15
Gross liability value of derivatives	26	1,330
Significant Other Observable Inputs (Level 2) | Assets
Derivative [Line Items]
Gross asset value of derivatives	4	15
Significant Other Observable Inputs (Level 2) | Liabilities
Derivative [Line Items]
Gross liability value of derivatives	$26	$1,330

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Non-Interest Income
Gain (loss) on derivative	$1,700,000	($800,000)
Non-Interest Expense
Gain (loss) on derivative	-118,000	-300,000
Interest rate swaps associated with certificates of deposits (terminated in 2014) | Non-Interest Expense
Loss on termination of derivative	$300,000

Condensed_Financial_Informatio2

Condensed Financial Information about Capital Bank Financial Corp. - Schedule of Condensed Balance Sheets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$106,193		$118,937
Total Assets	6,831,410		6,617,561
Liabilities and Shareholders’ Equity
Shareholder's equity	1,063,574		1,112,788		1,155,343	990,910
Total Liabilities and Shareholders’ Equity	6,831,410		6,617,561
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Contingent value right expense	1,706		2,833		188
Assets
Cash and due from banks	54,780		109,939
Investment in Bank subsidiary	1,107,652		1,100,473
Investment in other subsidiaries	4,696		4,691
Note receivable from subsidiary	3,393		3,393
Other assets	16,213		12,684
Total Assets	1,186,734		1,231,180
Liabilities and Shareholders’ Equity
Long-term borrowings1	91,831	[1]	89,787	[1]
Accrued expenses and other liabilities	31,329		28,605
Shareholder's equity	1,063,574		1,112,788
Total Liabilities and Shareholders’ Equity	$1,186,734		$1,231,180
[1]	Refer to note 13. Long-Term Borrowings for a maturity schedule of long-term borrowings.

Condensed_Financial_Informatio3

Condensed Financial Information about Capital Bank Financial Corp. - Schedule of Condensed Statements of Income (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating income
Interest income									$105		$543		$828
Dividend income from subsidiary									58		60		65
Operating expense
Interest expense	-61,351	-61,425	-60,831	-62,453	-65,723	-65,386	-65,352	-67,114	-246,060		-263,575		-255,224
(Gains) losses on extinguishment of debt									0		-122		3,267
Other expense									20,958		26,085		25,724
Income before income taxes									81,609		66,214		33,483
Income tax benefit									-30,691		-27,370		21,542
Net income before attribution of noncontrolling interests	13,836	13,243	12,425	11,414	12,206	11,444	9,429	5,765	50,918		38,844		55,025
Parent [Member]
Operating income
Interest income									515		463		99
Dividend income from subsidiary									56,113	[1]	106,023	[1]	35	[1]
Legal settlement									0		400		0
Management fee income									0				3,200
Total operating income									56,628		106,886		3,334
Operating expense
Salaries and benefits including stock-based compensation									3,093		5,846		21,233
Interest expense									5,854		7,061		2,512
(Gains) losses on extinguishment of debt									0		-122		0
Contingent value right expense									1,706		2,833		188
Other expense									3,131		3,811		3,605
Total operating expense									13,784		19,429		27,538
Income before income taxes									42,844		87,457		-24,204
Income tax benefit									4,598		5,998		9,085
Income (loss) before equity in undistributed earnings of subsidiaries									47,442		93,455		-15,119
Undistributed equity of subsidiaries, net of tax									3,476		-54,611		65,610
Net income before attribution of noncontrolling interests									$50,918		$38,844		$50,491
[1]	Refer to note 16. Shareholders' Equity and Minimum Regulatory Capital requirements for dividends to the Company by its subsidiary Capital Bank N.A.

Condensed_Financial_Informatio4

Condensed Financial Information about Capital Bank Financial Corp. - Schedule of Condensed Statements of Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$50,918	$38,844	$55,025
Stock-based compensation expense	2,642	5,439	18,681
Cash flows from financing activities
Purchases of treasury stock	-103,228	-69,962	0
Excess tax benefit from share-based payment	1,603	0	0
Net decrease in cash and cash equivalents	23,694	-570,433	24,911
Cash and cash equivalents at beginning of period	164,441	734,874	709,963
Cash and cash equivalents at end of period	188,135	164,441	734,874
Supplemental disclosures of non-cash transactions:
Net acquisition of non-cash liabilities	0	0	-156,942
Parent [Member]
Cash flows from operating activities
Net income	50,918	38,844	50,491
Equity in income from subsidiaries	-3,476	54,287	-65,610
Stock-based compensation expense	2,642	5,439	18,681
Decrease in net income tax obligation	-2,856	-6,002	-8,820
Change in other assets	44	153	1,030
Change in accrued expenses and other liabilities	-807	4,535	-8,787
Net cash provided by (used in) operating activities	46,465	97,256	-13,015
Cash flows from investing activities
Investment in bank subsidiary	0	0	0
Investment in bank holding company subsidiaries	0	0	-92,879
Net cash used in investing activities	0	0	-92,879
Cash flows from financing activities
Purchases of treasury stock	-103,227	-69,962	0
Repayments of advances from subsidiaries	0	-42,797	0
Excess tax benefit from share-based payment	1,603	0	0
Cash in lieu of fractional shares	0	-2	0
Net proceeds from issuance of common shares and merger	0	0	89,362
Net cash (used in) provided by financing activities	-101,624	-112,761	89,362
Net decrease in cash and cash equivalents	-55,159	-15,505	-16,532
Cash and cash equivalents at beginning of period	109,939	125,444	141,976
Cash and cash equivalents at end of period	54,780	109,939	125,444
Supplemental disclosures of non-cash transactions:
Elimination of noncontrolling interest	0	0	79,413
Net acquisition of non-cash liabilities	$0	$0	($156,942)

Supplemental_Financial_Data_Co

Supplemental Financial Data - Components of Other Expense in Excess of 1 Percent of Total Interest and Non-Interest Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of other expense in excess of total interest and non-interest income	1.00%
Amortization of intangibles	$4,303	$5,082	$4,718
Postage, courier and armored car	$3,468	$3,845	$3,901

Quarterly_Financial_Data_Unaud2

Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed income statements:
Interest and dividend income	$67,750	$67,643	$66,846	$68,543	$71,981	$72,480	$73,189	$76,106	$270,782	$293,756	$294,280
Net interest income	61,351	61,425	60,831	62,453	65,723	65,386	65,352	67,114	246,060	263,575	255,224
Provision (reversal) for loan losses	-637	-1,332	1,404	-24	3,265	984	4,467	5,402	-589	14,118	24,491
Net income	$13,836	$13,243	$12,425	$11,414	$12,206	$11,444	$9,429	$5,765	$50,918	$38,844	$55,025
Earnings per share, basic (in dollars per share)	$0.29	$0.28	$0.25	$0.23	$0.24	$0.22	$0.18	$0.11	$1.05	$0.74	$1.06
Earnings per share, diluted (in dollars per share)	$0.29	$0.27	$0.25	$0.22	$0.23	$0.22	$0.17	$0.11	$1.02	$0.73	$1.04