First Citizens BancShares (FCNCO) 10-K 25 Feb 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 25, 2015
Entity Registrant Name	FIRST CITIZENS BANCSHARES INC /DE/
Entity Central Index Key	798941
Current Fiscal Year End Date	-19
Entity Filer Category	Large 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	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$1,206,529,239
Class A Common Stock
Entity Common Stock, Shares Outstanding			11,005,220
Class B Common Stock
Entity Common Stock, Shares Outstanding			1,005,185

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$604,182	$533,599
Overnight investments	1,724,919	859,324
Investment securities available for sale	7,171,917	5,387,703
Investment securities held to maturity	518	907
Loans Receivable Held-for-sale, Amount	63,696	47,271
Loans and leases:
Less allowance for loan and lease losses	204,466	233,394
Net loans and leases	18,564,999	12,900,330
Loans and Leases Receivable, Gross	18,769,465	13,133,724
Premises and equipment	1,125,081	876,522
Other real estate owned:
Other Real Estate, Covered	22,982	47,081
Other Real Estate, Non Covered	70,454	36,898
Income earned not collected	57,254	48,390
FDIC loss share receivable	28,701	93,397
Goodwill	139,773	102,625
Other intangible assets	106,610	1,263
Other assets	394,027	258,568
Total assets	30,075,113	21,193,878
Liabilities
Noninterest-bearing	8,086,784	5,241,817
Interest-bearing	17,591,793	12,632,249
Total deposits	25,678,577	17,874,066
Debt, Current	987,184	511,418
Long-term obligations	351,320	510,769
FDIC loss share payable	116,535	109,378
Other liabilities	253,903	116,785
Total liabilities	27,387,519	19,122,416
Shareholders' Equity
Surplus	658,918	143,766
Retained earnings	2,069,647	1,943,345
Accumulated other comprehensive loss	-52,981	-25,268
Total shareholders' equity	2,687,594	2,071,462
Total liabilities and shareholders' equity	30,075,113	21,193,878
Class A Common Stock
Shareholders' Equity
Common stock	11,005	8,586
Class B Common Stock
Shareholders' Equity
Common stock	$1,005	$1,033

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Available-for-sale Securities, Amortized Cost Basis	$7,163,574	$5,404,335
Class A Common Stock
Common stock, par value (in dollars per share)	$1	$1
Common stock, shared authorized	16,000,000	11,000,000
Common stock, shares issued	11,005,220	8,586,058
Common stock, shares outstanding	11,005,220	8,586,058
Class B Common Stock
Common stock, par value (in dollars per share)	$1	$1
Common stock, shared authorized	2,000,000	2,000,000
Common stock, shares issued	1,005,185	1,032,883
Common stock, shares outstanding	1,005,185	1,032,883
Mortgage Backed Securities, Other [Member]
Available-for-sale Securities, Amortized Cost Basis	3,628,187	2,486,297
Held-to-maturity Securities, Fair Value	$544	$974

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Loans and leases	$700,525	$757,197	$967,601
Investment securities:
U. S. Treasury	11,656	1,645	2,471
Government agency	7,410	12,265	15,688
Residential mortgage-backed securities	36,492	22,642	14,388
State, county and municipal	13	12	36
Other	640	320	2,914
Total investment securities interest and dividend income	56,211	36,884	35,497
Overnight investments	3,712	2,723	1,738
Total interest income	760,448	796,804	1,004,836
Interest expense
Deposits	24,786	34,495	57,568
Short-term borrowings	9,177	2,724	5,107
Long-term obligations	16,388	19,399	27,473
Total interest expense	50,351	56,618	90,148
Net interest income (loss)	710,097	740,186	914,688
Provision for loan and lease losses	640	-32,255	142,885
Net interest income after provision for loan and lease losses	709,457	772,441	771,803
Noninterest income
Cardholder and merchant services	56,820	48,360	45,174
Merchant Discount Fees	64,075	56,024	50,298
Service charges on deposit accounts	69,100	60,661	61,564
Wealth management services	66,115	59,628	57,236
Fees from processing services	17,989	22,821	34,816
Securities gains (losses)	29,096	0	2,277
Other service charges and fees	17,760	15,696	14,239
Mortgage income	5,828	11,065	8,072
Insurance commissions	11,129	10,694	9,974
ATM income	5,388	5,026	5,279
Adjustments to FDIC receivable	-32,151	-72,342	-101,594
Other	29,277	49,749	4,919
Total noninterest income	340,426	267,382	192,254
Noninterest expense
Salaries and wages	349,279	308,936	307,036
Employee benefits	79,898	90,479	78,861
Occupancy expense	86,775	75,713	74,798
Equipment expense	79,084	75,538	74,822
FDIC insurance expense	12,979	10,175	10,656
Foreclosure-related expenses	17,368	17,134	40,654
Merger-related expenses	13,064	391	791
Other	207,842	193,014	179,315
Total noninterest expense	846,289	771,380	766,933
Income before income taxes	203,594	268,443	197,124
Income taxes	65,032	101,574	64,729
Income taxes	98,371	53,928	99,151
Net income	$138,562	$166,869	$132,395
Average shares outstanding (in shares)	10,221,721	9,618,952	10,244,472
Cash dividends (in dollars per share)	$1.20	$1.20	$1.20
Net income per share	$13.56	$17.35	$12.92

Consolidated_Statement_of_Comp

Consolidated Statement 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	$138,562	$166,869	$132,395
Change in unrealized gains and losses on securities:
Change in unrealized securities gains (losses) arising during period	-4,121	-50,441	9,566
Tax effect	1,438	19,833	-3,759
Reclassification adjustment for gains included in income before income taxes	29,096	0	-2,322
Tax effect	-11,224	0	917
Total change in unrealized gains (losses) on securities, net of tax	15,189	-30,608	4,402
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	2,883	3,178	316
Tax effect	-1,113	-1,320	-125
Total change in unrecognized loss on cash flow hedges, net of tax	1,770	1,858	191
Change in pension obligation:
Change in pension obligation	-78,472	123,557	-44,315
Tax effect	30,526	-48,475	17,354
Reclassification adjustment for gains included in income before income taxes	5,358	17,195	11,236
Tax effect	-2,084	-6,689	-4,400
Total change in pension obligation, net of tax	-44,672	85,588	-20,125
Net current period other comprehensive income (loss)	-27,713	56,838	-15,532
Total comprehensive income	$110,849	$223,707	$116,863

Consolidated_Statements_of_Cha

Consolidated Statements of Changes In Shareholders' Equity (USD $)	Total	Class A Common Stock	Class B Common Stock	Common Stock	Common Stock	Common Stock	Surplus	Surplus	Surplus	Retained Earnings [Member]	Retained Earnings [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss
In Thousands, unless otherwise specified					Class A Common Stock	Class B Common Stock		Class A Common Stock	Class B Common Stock		Class A Common Stock	Class B Common Stock		Class A Common Stock	Class B Common Stock
Beginning balance at Dec. 31, 2011	$1,861,128				$8,644	$1,640	$143,766			$1,773,652			($66,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	-2,430									-2,430
Net income	132,395				0	0	0			132,395			0
Net current period other comprehensive income	-15,532				0	0	0			0			-15,532
Repurchase of common stock shares		-9,131	-94,493		-56	-607		0	0		-9,075	-93,886		0	0
Repurchase and retirement of common stock	0
Cash dividends	-12,313				0	0	0			-12,313			0
Ending balance at Dec. 31, 2012	1,859,624				8,588	1,033	143,766			1,788,343			-82,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	166,869				0	0	0			166,869			0
Net current period other comprehensive income	56,838				0	0	0			0			56,838
Repurchase of common stock shares		-321			-2			0			-319			0
Repurchase and retirement of common stock	0
Cash dividends	-11,548				0	0	0			-11,548			0
Ending balance at Dec. 31, 2013	2,071,462				8,586	1,033	143,766			1,943,345			-25,268
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	138,562				0	0	0			138,562			0
Net current period other comprehensive income	-27,713				0	0	0			0			-27,713
Stock Issued During Period, Value, New Issues	563,628				2,587	18	561,023			0			0
Repurchase and retirement of common stock	46,085	36,308	9,777	0	168	46		36,140	9,731		0	0		0	0
Cash dividends	-12,260				0	0	0			-12,260			0
Ending balance at Dec. 31, 2014	$2,687,594				$11,005	$1,005	$658,918			$2,069,647			($52,981)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$1.20
Stock issuance costs	$619

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
OPERATING ACTIVITIES
Net income	$138,562	$166,869		$132,395
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	640	-32,255		142,885
Deferred tax expense (benefit)	-33,339	47,646		-34,422
Change in current taxes payable	72,274	-79,173		29,095
Depreciation	75,481	70,841		68,941
Change in accrued interest payable	1,457	-2,616		-14,366
Change in income earned not collected	6,402	-724		-5,450
Gain on sale of other assets	0	-4,085		0
Securities losses (gains)	-29,096	0		-2,277
Origination of loans held for sale	-377,993	-393,908		-575,705
Proceeds from sale of loans held for sale	398,719	443,708		589,376
Gain on sale of loans	-4,971	-10,738		-7,465
Loss on sale of other real estate	14,275	6,686		36,229
Gain on elimination of acquired debt	-1,988	0		0
Net amortization of premiums and discounts	-48,374	-112,759		-156,796
Amortization of intangible assets	6,955	2,309		3,476
FDIC receivable for loss share agreements	27,666	71,771		-7,181
FDIC payable for loss share agreements	6,933	7,821		101,557
Net change in other assets	-72,680	100,437		-21,414
Net change in other liabilities	1,319	49,177		-77,590
Net cash provided by operating activities	182,242	331,007		201,288
INVESTING ACTIVITIES
Net change in loans outstanding	-814,372	323,436		627,806
Purchases of investment securities available for sale	-2,518,680	-2,671,420		-5,169,641
Proceeds from maturities of investment securities held to maturity	389	435		480
Proceeds from maturities of investment securities available for sale	2,482,722	2,437,851		3,986,370
Proceeds from sales of investment securities available for sale	422,652	0		7,900
Net change in overnight investments	221,730	-416,144		-8,205
Cash (paid to) received from the FDIC for loss share agreements	-1,286	19,373		251,972
Proceeds from Sale of Other Real Estate	89,485	147,550		147,858
Additions to premises and equipment	-82,708	-66,037		-88,883
Business acquisition, net of cash acquired	182,370	0		0
Net cash (used) provided by investing activities	-17,698	-224,956		-244,343
FINANCING ACTIVITIES
Net change in time deposits	-499,869	-699,005		-1,049,761
Net change in demand and other interest-bearing deposits	497,692	487,046		1,558,512
Net change in short-term borrowings	-25,321	-57,087		-101,717
Repayment of long-term obligations	-54,301	-4,152		-196,338
Origination of long-term obligations	0	70,000		310
Stock issuance costs	-619	0		0
Repurchase of common stock	0	-321		-103,624
Cash dividends paid	-11,543	-8,663		-15,398
Net cash provided (used) by financing activities	-93,961	-212,182		91,984
Change in cash and due from banks	70,583	-106,131		48,929
Cash and due from banks at beginning of period	533,599	639,730		590,801
Cash and due from banks at end of period	604,182	533,599		639,730
CASH PAYMENTS FOR:
Interest	48,894	59,234		104,514
Income taxes	127,970	102,890		66,453
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	65,956	92,125		140,645
Dividends declared but not paid	3,603	2,885		0
Reclassification of reserve for unfunded commitments to allowance for loans and leases	0	7,368	[1]	0
Repurchase and retirement of common stock	-46,085	0		0
Issuance of common stock associated with Bancorporation merger	$564,248	$0		$0
[1]	Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.

Accounting_Policies_and_Basis_

Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Accounting Policies and Basis of Presentation	ACCOUNTING POLICIES AND BASIS OF PRESENTATION
	General
	First Citizens BancShares, Inc. ("BancShares") is a financial holding company organized under the laws of Delaware and conducts operations through its banking subsidiary, First-Citizens Bank & Trust Company ("FCB"), which is headquartered in Raleigh, North Carolina. For the period October 1, 2014 through December 31, 2014, Bancshares maintained two banking subsidiaries. On January 1, 2015, First Citizens Bank and Trust Company, Inc. ("FCB-SC") merged with and into FCB. As of January 1, 2015, FCB remains as the single banking subsidiary of BancShares.
	On January 1, 2014, FCB completed the merger of 1st Financial Services Corporation ("1st Financial"). The 1st Financial merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities, and identifiable intangible assets were recorded at their acquisition date estimated fair values. See Note B for additional information regarding the 1st Financial merger.
	On October 1, 2014, BancShares completed the merger of First Citizens Bancorporation, Inc. ("Bancorporation") with and into BancShares pursuant to an Agreement and Plan of Merger dated June 10, 2014, as amended on July 29, 2014. FCB-SC merged with and into FCB on January 1, 2015. Under the terms of the Merger Agreement, each share of Bancorporation common stock was converted into the right to receive 4.00 shares of BancShares' Class A common stock and $50.00 cash, unless the holder elected for each share to be converted into the right to receive 3.58 shares of BancShares' Class A common stock and 0.42 shares of BancShares' Class B common stock. The Bancorporation merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities and identifiable intangible assets were recorded at their acquisition date estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the transaction as additional information regarding closing date fair values becomes available. See Note B for additional information regarding the Bancorporation merger.
	The accounting and reporting policies of BancShares and its subsidiaries are in accordance with accounting principles generally accepted in the United States of America ("GAAP"). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. The following is a summary of BancShares' more significant accounting policies.
	Nature of Operations
	FCB and FCB-SC operate 572 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Washington, DC, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma and Kansas. FCB and FCB-SC provide full-service banking services designed to meet the needs of retail and commercial customers in the markets in which they operate. The services provided include transaction and savings deposit accounts, commercial and consumer loans, trust and asset management. Investment services, including sales of annuities and third party mutual funds are offered through First Citizens Investor Services, Inc. and First Citizens Securities Corporation, and title insurance is offered through Neuse Financial Services, Inc.
	Principles of Consolidation and Segment Reporting
	The consolidated financial statements of BancShares include the accounts of BancShares and those subsidiaries that are majority owned by BancShares and over which BancShares exercises control. In consolidation, all significant intercompany accounts and transactions are eliminated. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly-owned and majority-owned subsidiaries are consolidated unless GAAP requires otherwise. BancShares operates with centralized management and combined reporting, thus BancShares operates as one consolidated reportable segment.
	FCB and FCB-SC have investments in certain partnerships and limited liability entities primarily for the purposes of fulfilling Community Reinvestment Act requirements and/or obtaining tax credits. The entities have been evaluated and determined to be variable interest entities ("VIEs"). VIEs are legal entities in which equity investors do not have sufficient equity at risk for the entity to independently finance its activities, or as a group, the holders of the equity investment at risk lack the power through voting or similar rights to direct the activities of the entity that most significantly impact its economic performance, or do not have the obligation to absorb the expected losses of the entity or the right to receive expected residual returns of the entity. Consolidation of a VIE is considered appropriate if a reporting entity holds a controlling financial interest in the VIE. Analysis of these investments concluded that FCB and FCB-SC are not the primary beneficiary and do not hold a controlling interest in the VIEs and, therefore, the assets and liabilities of these entities are not consolidated into the financial statements of FCB, FCB-SC or BancShares. The recorded investment in these entities is reported within other assets in BancShares' Consolidated Balance Sheets.
	Reclassifications
	Prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects which was adopted as of January 1, 2012 and did not have a material impact on our consolidated financial condition or results of operations.
	In certain instances other than the retrospective adoption of ASU 2014-01, amounts reported in prior years' consolidated financial statements have been reclassified to conform to the current financial statement presentation. Such reclassifications had no effect on previously reported cash flows, shareholders' equity or net income.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates, and different assumptions in the application of these policies could result in material changes in BancShares' consolidated financial position, the consolidated results of its operations or related disclosures. Material estimates that are particularly susceptible to significant change include:
	•	Allowance for loan and lease losses
	•	Fair value of financial instruments, including acquired assets and assumed liabilities
	•	Pension plan assumptions
	•	Cash flow estimates on purchased credit-impaired ("PCI") loans
	•	Receivable from and payable to the FDIC for loss share agreements
	•	Income tax assets, liabilities and expense
	Business Combinations
	BancShares accounts for all business combinations using the acquisition method of accounting as required by Accounting Standards Codification ("ASC") 805, Business Combinations. Under this method of accounting, acquired assets and assumed liabilities are included with the acquirer's accounts as of the date of acquisition, with any excess of purchase price over the fair value of the net assets acquired recognized as either finite lived intangibles or capitalized as goodwill. In addition, acquisition-related costs and restructuring costs are recognized as period expenses as incurred.
	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, interest-bearing deposits with banks and federal funds sold. Cash and cash equivalents have maturities of three months or less.
	Investment Securities
	BancShares classifies marketable investment securities as held to maturity, available for sale or trading. Interest income and dividends on securities are recognized in interest income on an accrual basis. Premiums and discounts on debt securities are amortized as an adjustment to interest income using the interest method. At December 31, 2014 and 2013, BancShares had no investment securities held for trading purposes.
	Debt securities are classified as held to maturity where BancShares has both the intent and ability to hold the securities to maturity. These securities are reported at amortized cost.
	Investment securities that may be sold to meet liquidity needs arising from unanticipated deposit and loan fluctuations, changes in regulatory capital requirements or unforeseen changes in market conditions, are classified as available for sale. Securities available for sale are reported at estimated fair value, with unrealized gains and losses reported in accumulated other comprehensive income or loss, net of deferred income taxes, in the shareholders' equity section of the Consolidated Balance Sheets. Gains or losses realized from the sale of securities available for sale are determined by specific identification on a trade date basis and are included in noninterest income.
	BancShares evaluates each held to maturity and available for sale security in a loss position for other-than-temporary impairment ("OTTI") in accordance with ASC 320-10, Investments - Debt and Equity Securities, at least quarterly. BancShares considers such factors as the length of time and the extent to which the market value has been below amortized cost, long term expectations and recent experience regarding principal and interest payments, BancShares' intent to sell, and whether it is more likely than not that it would be required to sell those securities before the anticipated recovery of the amortized cost basis. The credit component of an OTTI loss is recognized in earnings and the non-credit component is recognized in accumulated other comprehensive income in situations where BancShares does not intend to sell the security, and it is more likely than not that BancShares will not be required to sell the security prior to recovery.
	Nonmarketable Securities - FHLB Stock and TARP Stock
	Federal law requires a member institution of the Federal Home Loan Bank ("FHLB") system to purchase and hold restricted stock of its district FHLB according to a predetermined formula. This stock is restricted in that it may only be sold to the FHLB and all sales must be at par. Accordingly, the FHLB restricted stock is carried at cost, less any applicable impairment charges.
	Investments in preferred stock that had initially been issued under the U.S. Treasury's Troubled Asset Recovery Program ("TARP") and were purchased in the auction process initiated when the U.S. Treasury decided to liquidate its investments are carried at cost, less any applicable impairment charges, because the securities are not traded and an active market does not exist. Nonmarketable securities are periodically evaluated for impairment. BancShares considers positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience when determining the ultimate recoverability of the recorded investment. Investments in FHLB stock and TARP stock are recorded within other assets in BancShares’ Consolidated Balance Sheets.
	Loans Held For Sale
	BancShares has elected to apply the fair value option for new originations of prime residential mortgage loans to be sold at fair value. BancShares elected the fair value option in 2014 and accounts for the forward commitments used to economically hedge the loans held for sale at fair value. Gains and losses on sales of mortgage loans are recognized in the Consolidated Statements of Income in mortgage income. Origination fees collected are deferred and recorded in mortgage income in the period the corresponding loan is sold.
	Loans and Leases
	BancShares' accounting methods for loans and leases differ depending on whether they are purchased credit-impaired ("PCI") or non-PCI.
	Non-Purchased Credit Impaired ("Non-PCI") Loans and Leases
	Loans and leases for which management has the intent and ability to hold for the foreseeable future are classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs on non-PCI loans. Nonrefundable fees collected and certain direct costs incurred related to loan originations are deferred and recorded as an adjustment to loans and leases outstanding. The net amount of the nonrefundable fees and costs are amortized to interest income over the contractual lives using methods that approximate a constant yield. Net deferred fees on non-PCI loans, including unearned income and unamortized costs, fees, premiums and discounts, totaled $20.8 million and $22.9 million at December 31, 2014 and 2013, respectively.
	Non-PCI loans include originated commercial, originated noncommercial, purchased non-impaired loans and certain purchased revolving credit. For purchased non-impaired loans to be included as non-PCI, it must be determined that the loans do not have a discount at least in part due to credit quality at the time of acquisition. The difference between fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the estimated life of the loans using a method that approximates the interest method.
	Purchased Credit Impaired ("PCI") Loans and Leases
	PCI loans and leases are recorded at fair value at the date of acquisition. No allowance for loan and lease losses is recorded on the acquisition date as the fair value of the acquired assets incorporates assumptions regarding credit risk.
	PCI loans and leases are evaluated at acquisition and where a discount is required at least in part due to credit, the loans are accounted for under the guidance in ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Purchased impaired loans and leases reflect credit deterioration since origination such that it is probable at acquisition that BancShares will be unable to collect all contractually required payments. As of the acquisition date, the difference between contractually required payments and the cash flows expected to be collected is the nonaccretable difference, which is included as a reduction to the carrying amount of PCI loans and leases. If the timing and amount of the future cash flows is reasonably estimable, any excess of cash flows expected at acquisition over the estimated fair value is the accretable yield and is recognized in interest income over the asset's remaining life using the effective yield method.
	Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using the effective interest rates has decreased and if so, recognizes provision for loan and lease losses in its Consolidated Statements of Income. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first through a reversal of previously recognized through provision expense, and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
	Accretion income is recognized on all non-pooled PCI loans and leases except for situations when the timing and amount of future cash flows cannot be determined. PCI loans and leases with uncertain future cash flows are accounted for under the cost recovery method and those loans and leases are generally reported as nonaccrual.
	For PCI loans and leases where the cash flow analysis was initially performed at the loan pool level, the amount of accretable yield and nonaccretable difference is determined at the pool level. Each loan pool is made up of assets with similar characteristics at the date of acquisition including loan type, collateral type and performance status. All loan pools that have accretable yield to be recognized in interest income are classified as accruing regardless of the status of individual loans within the pool.
	Impaired Loans, Troubled Debt Restructurings (TDR) and Nonperforming Assets
	Management will deem non-PCI loans and leases to be impaired when, based on current information and events, it is probable that a borrower will be unable to pay all amounts due according to the contractual terms of the loan agreement. Generally, management considers the following loans to be impaired: all TDR loans, commercial and consumer relationships which are nonaccrual or 90+ days past due and greater than $500,000 as well as any other loan management deems impaired. When the ultimate collectability of an impaired loan's principal is doubtful, all cash receipts are applied to principal. Once the recorded principal balance has been reduced to zero, future cash receipts are applied first to all previously charged off principal until fully collected, then to interest income, to the extent that any interest has been foregone.
	A loan is considered a TDR when both of the following occur: (1) a modification to a borrower's debt agreement is made and (2) a concession that is granted for economic or legal reasons related to a borrower's financial difficulties that otherwise would not be granted. TDRs are undertaken in order to improve the likelihood of collection on the loan and may result in a stated interest rate lower than the current market rate for new debt with similar risk, other modifications to the structure of the loan that fall outside of normal underwriting policies and procedures or, in certain limited circumstances, forgiveness of principal or interest. Modifications of PCI loans that are part of a pool accounted for as a single asset are not designated as TDRs. Modifications of non-pooled PCI loans are designated as TDRs in the same manner as non-PCI loans. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual or continuing on accruing status, depending on the individual facts and circumstances of the borrower. In circumstances where a portion of the loan balance is charged off, BancShares typically classifies the remaining balance as nonaccrual.
	In connection with commercial TDRs, the decision to maintain a loan that has been restructured on accrual status is based on a current credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's current capacity to pay, which may include a review of the borrower's current financial statements, an analysis of cash flow documenting the borrower's capacity to pay all debt obligations and an evaluation of secondary sources of payment from the borrower and any guarantors. This evaluation also includes an evaluation of the borrower's current willingness to pay, which may include a review of past payment history, an evaluation of the borrower's willingness to provide information on a timely basis and consideration of offers from the borrower to provide additional collateral or guarantor support. The credit evaluation also reflects consideration of the adequacy of collateral to cover all principal and interest and trends indicating improving profitability and collectability of receivables.
	Nonaccrual TDRs may be returned to accrual status based on a current credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's sustained historical repayment performance for a reasonable period, generally a minimum of six months, prior to the date on which the loan is returned to accrual status. Sustained historical repayment performance for a reasonable time prior to the restructuring may also be considered.
	Nonperforming assets include nonaccrual loans and leases and foreclosed property. Foreclosed property consists of real estate and other assets acquired as a result of loan defaults.
	BancShares classifies all non-PCI loans and leases as past due when the payment of principal and interest based upon contractual terms is greater than 30 days delinquent. Generally, commercial loans are placed on nonaccrual status when principal or interest becomes 90 days past due or when it is probable that principal or interest is not fully collectible, whichever occurs first. Once a loan is placed on nonaccrual status it is evaluated for impairment and a charge-off is recorded in the amount of the impairment. Consumer loans are subject to mandatory charge-off at a specified delinquency date consistent with regulatory guidelines.
	Generally, when loans and leases are placed on nonaccrual status all previously uncollected accrued interest is reversed from interest income. All payments received thereafter are applied as a reduction of the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans and leases 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.
	Other Real Estate Owned ("OREO") acquired as a result of foreclosure is carried at net realizable value. Net realizable value equals fair value less estimated selling costs. Any excess of cost over fair value at the time of foreclosure is charged to the allowance for loan and lease losses. Cost is determined based on the sum of unpaid principal, accrued but unpaid interest and acquisition costs associated with the loan.
	OREO is subject to periodic revaluations of the underlying collateral, at least annually. The periodic revaluations are generally based on the appraised value of the property and may include additional adjustments based upon management's review of the valuation and specific knowledge of the OREO. Routine maintenance costs, subsequent declines in market value and net losses on disposal are included in foreclosed property expense. Gains and losses resulting from the sale or write down of OREO and income and expenses related to its operation are recorded in other noninterest expense.
	OREO covered by loss share agreements with the FDIC ("covered OREO") is reported exclusive of expected reimbursement of cash flows from the FDIC at net realizable value. Subsequent downward adjustments to the estimated recoverable value of covered OREO result in a reduction in covered OREO, a charge to foreclosure related expenses and an increase in the FDIC receivable for the estimated amount to be reimbursed, with a corresponding amount recorded as an adjustment to FDIC receivable. Covered OREO is discussed in more detail below.
	Covered Assets and Receivable from FDIC for Loss Share Agreements
	Assets subject to loss share agreements with the FDIC include certain loans and OREO. These loss share agreements afford BancShares significant protection as they cover realized losses on certain loans and other assets purchased from the FDIC during the time period specified in the agreements. Realized losses covered include loan contractual balances, accrued interest on loans for up to 90 days, the book value of foreclosed real estate acquired and certain direct costs, less cash or other consideration received by BancShares.
	The FDIC receivable is recorded at fair value at the acquisition date of the indemnified assets and is measured on the same basis as the underlying loans, subject to collectability and/or contractual limitations. The fair value of the loss share agreements on the acquisition date reflects the discounted reimbursements expected to be received from the FDIC, using an appropriate discount rate, which is based on the market rate for a similar term security at the time of the acquisition adjusted for additional risk premium.
	The loss share agreements continue to be valued on the same basis as the related indemnified assets. Because the PCI loans are subject to the accounting prescribed by ASC 310-30, subsequent changes to the basis of the loss share agreements also follow that model. Deterioration in the credit quality of the loans, which is immediately recorded as an adjustment to the allowance for loan and lease losses, would immediately increase the FDIC receivable, with the offset recorded through the Consolidated Statements of Income in other noninterest income. Improvements in the credit quality or cash flows of loans, which is reflected as an adjustment to yield and accreted into income over the remaining life of the loans, decrease the FDIC receivable, with such decrease being amortized into income over (1) the same period as the underlying loans or (2) the life of the loss share agreements, whichever is shorter. Loss assumptions used in the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification asset. Discounts and premiums reflecting the estimated timing of expected reimbursements are accreted into income over the life of the loss share agreements.
	Collection and other servicing costs related to loans covered under FDIC loss share agreements are charged to noninterest expense as incurred. A receivable from the FDIC is recorded for the estimated amount of such expenses that are expected to be reimbursed and results in an increase to noninterest income. The estimated amount of such reimbursements is determined by several factors including the existence of loan participation agreements with other financial institutions, the presence of partial guarantees from the Small Business Administration and whether a reimbursable loss has been recorded on the loan for which collection and servicing costs have been incurred. Future adjustments to the receivable from the FDIC may be necessary as additional information becomes available related to the amount of previously recorded collection and other servicing costs that will actually be reimbursed by the FDIC and the probable timing of such reimbursements.
	Payable to the FDIC for Loss Share Agreements
The purchase and assumption agreements for certain FDIC-assisted transactions include contingent payments that may be owed to the FDIC at the termination of the loss share agreements. The contingent payment is due to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The contingent liability is calculated by discounting estimated future payments and is reported in the Consolidated Balance Sheets as an FDIC loss share payable. The ultimate settlement amount of the contingent payment is dependent upon the performance of the underlying covered loans, the passage of time and actual claims submitted to the FDIC.
Allowance for Loan and Lease Losses ("ALLL")
The ALLL represents management's best estimate of probable credit losses within the loan and lease portfolio at the balance sheet date. Management determines the ALLL based on an ongoing evaluation. This evaluation is inherently subjective because it requires material estimates, including the amount and timing of cash flows expected to be received on PCI loans. Those estimates are susceptible to significant change. Adjustments to the ALLL are recorded with a corresponding entry to provision for loan and lease losses. Loan and lease balances deemed to be uncollectible are charged off against the ALLL. Recoveries of amounts previously charged off are generally credited to the ALLL.
Accounting standards require the presentation of certain information at the portfolio segment level, which represents the level at which the company has developed and documents a systematic methodology to determine its ALLL. BancShares evaluates its loan and lease portfolio using three portfolio segments; non-PCI commercial, non-PCI noncommercial and PCI. The non-PCI commercial segment includes commercial construction and land development, commercial mortgage, commercial and industrial, lease financing and other commercial real estate loans and the related ALLL is calculated based on a risk-based approach as reflected in credit risk grades assigned to individual loans. The non-PCI noncommercial segment includes noncommercial construction and land development, residential mortgage, revolving mortgage and consumer loans and the associated ALLL is determined using a delinquency-based approach.
BancShares' methodology for calculating the ALLL includes estimating a general allowance for pools of unimpaired loans and specific allocations for significant individual impaired loans for non-PCI loans. The general allowance is based on net historical loan loss experience for homogeneous groups of loans based mostly on loan type then aggregated on the basis of similar risk characteristics and performance trends. This allowance estimate contains qualitative components that allow management to adjust reserves based on historical loan loss experience for changes in the economic environment, portfolio trends and other factors. The methodology also considers the remaining discounts recognized upon acquisition associated with purchase non-impaired loans in estimating a general allowance. The specific allowance component is determined when management believes that the collectability of an individually reviewed loan has been impaired and a loss is probable.
A primary component of determining the general allowance for performing and classified loans not analyzed specifically is the actual loss history of the various classes. Loan loss factors based on historical experience may be adjusted for significant factors that, in management's judgment, affect the collectability of the portfolio at the balance sheet date. For non-PCI commercial loans and leases, management incorporates historical net loss data to develop the applicable loan loss factors by utilizing information that considers the class of the commercial loan and associated risk rating. For the non-PCI noncommercial segment, management incorporates specific loan class and delinquency status trends into the loan loss factors. Loan loss factors may be adjusted quarterly based on changes in the level of historical net charge-offs and updates by management, such as the number of periods included in the calculation of loss factors, loss severity and portfolio attrition.
The qualitative framework used in estimating the general allowance considers economic conditions, composition of the loan portfolio, trends in delinquent and nonperforming loans, historical loss experience by categories of loans, concentrations of credit, changes in lending policies and underwriting standards, regulatory exam results and other factors indicative of inherent losses remaining in the portfolio. Management may adjust the ALLL calculated based on historical loan loss factors when assessing changes in the factors in the qualitative framework. The adjustments to the ALLL for the qualitative framework are based on economic data, data analysis of portfolio trends and management judgment. These adjustments are specific to the loan class level.
The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using their effective interest rates has decreased and if so, recognizes provision for loan and lease losses. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
Prior to the second quarter of 2013, a portion of the allowance for loan and lease losses was not allocated to any specific class of loans. This nonspecific portion reflected management's best estimate of the elements of imprecision and estimation risk inherent in the calculation of the overall ALLL. During the second quarter of 2013, BancShares implemented enhancements to the process to estimate the ALLL and the reserve for unfunded commitments, described below. Through detailed analysis of historical loss data, the process enhancements enabled allocation of the previously unallocated "nonspecific" ALLL and a portion of the reserve for unfunded loan commitments to specific loan classes. The enhanced ALLL estimates implicitly include the risk of draws on open lines within each loan class. Other than the modifications described above, the enhancements to the methodology did not have a material impact on the ALLL.
Specific allocations are made for larger, individual impaired loans. All impaired loans are reviewed for potential impairment on a quarterly basis. Specific valuation allowances are established or partial charge-offs are recorded on impaired loans for the difference between the loan amount and the estimated fair value. The fair value of impaired loans is based on the present value of expected cash flows, market prices of the loans, if available, or the value of the underlying collateral. Expected cash flows are discounted at the loans' effective interest rates.
Management continuously monitors and actively manages the credit quality of the entire loan portfolio and adjusts the ALLL to an appropriate level. By assessing the probable estimated incurred losses in the loan portfolio on a quarterly basis, management is able to adjust specific and general loss estimates based upon the most recent information available. Future adjustments to the ALLL may be necessary based on changes in economic and other conditions. Additionally, various regulatory agencies, as an integral part of their examination process, periodically review BancShares' ALLL. Such agencies may require the recognition of adjustments to the ALLL based on their judgments of information available to them at the time of their examination. Management considers the established ALLL adequate to absorb probable losses that relate to loans and leases outstanding as of December 31, 2014.
Each portfolio segment and the classes within those segments are subject to risks that could have an adverse impact on the credit quality of the loan and lease portfolio and the related ALLL. Management has identified the most significant risks as described below that are generally similar among the segments and classes. While the list is not exhaustive, it provides a description of the risks management has determined are the most significant.
Non-PCI Commercial Loans and Leases
Each originated commercial loan or lease is centrally underwritten based primarily upon the customer's ability to generate the required cash flow to service the debt in accordance with the contractual terms and conditions of the loan agreement. A complete understanding of the borrower's business, including the experience and background of the principals, is obtained prior to approval. To the extent that the loan or lease is secured by collateral, which is true for the majority of commercial loans and leases, the likely value of the collateral and what level of strength the collateral brings to the transaction is evaluated. To the extent that the principals or other parties provide personal guarantees, the relative financial strength and liquidity of each guarantor is assessed.
The significant majority of relationships in the non-PCI commercial segment are assigned credit risk grades based upon an assessment of conditions that affect the borrower's ability to meet contractual obligations under the loan agreement. This process includes reviewing the borrowers' financial information, payment history, credit documentation, public information and other information specific to each borrower. Credit risk grades are reviewed annually, or at any point management becomes aware of information affecting the borrowers' ability to fulfill their obligations. Our credit risk grading standards are described in Note D.
The impairment assessment and determination of the related specific reserve for each impaired loan is based on the loan's characteristics. Impairment measurement for loans that are not collateral dependent is based on the present value of expected cash flows discounted at the loan's effective interest rate. Specific valuation allowances are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value for originated loans. Specific valuation allowances for purchased non-impaired loans are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value with consideration for the remaining discounts recognized upon acquisition. Impairment measurement for most real estate loans, particularly when a loan is considered to be a probable foreclosure, is based on the fair value of the underlying collateral. Collateral is appraised and market value, appropriately adjusted for an assessment of the sales and marketing costs as well as the expected holding period, are used to calculate an anticipated fair value.
General reserves for collective impairment are based on estimated incurred losses related to unimpaired commercial loans and leases as of the balance sheet date. Incurred loss estimates for the originated commercial segment are based on average loss rates by credit risk ratings, which are estimated using historical loss experience and credit risk rating migrations. Incurred loss estimates may be adjusted through a qualitative assessment to reflect current economic conditions and portfolio trends including credit quality, concentrations, aging of the portfolio and significant policy and underwriting changes.
Common risks to each class of commercial loans include general economic conditions within the markets BancShares serves, as well as risks that are specific to each transaction including demand for products and services, personal events, such as disability or change in marital status and reductions in the value of collateral. Due to the concentration of loans in the medical, dental and related fields, BancShares is susceptible to risks that governmental actions, including implementation of the Affordable Care Act, will fundamentally alter the medical care industry in the United States.
In addition to these common risks for the majority of the non-PCI commercial segment, additional risks are inherent in certain classes of non-PCI commercial loans and leases.
Commercial construction and land development
Commercial construction and land development loans are highly dependent on the supply and demand for commercial real estate in the markets served by BancShares as well as the demand for newly constructed residential homes and lots that customers are developing. Deterioration in demand could result in decreases in collateral values and could make repayment of the outstanding loans more difficult for customers.
Commercial mortgage, commercial and industrial and lease financing
Commercial mortgage loans, commercial and industrial loans and lease financing are primarily dependent on the ability of borrowers to achieve business results consistent with those projected at loan origination resulting in cash flow sufficient to service the debt. To the extent that a customer's business results are significantly unfavorable versus the original projections, the ability for the loan to be serviced on a basis consistent with the contractual terms may be at risk. While these loans and leases are generally secured by real property, personal property or business assets such as inventory or accounts receivable, it is possible that the liquidation of the collateral will not fully satisfy the obligation.
Other commercial real estate
Other commercial real estate loans consist primarily of loans secured by multifamily housing and agricultural loans. The primary risk associated with multifamily loans is the ability of the income-producing property that collateralizes the loan to produce adequate cash flow to service the debt. High unemployment or generally weak economic conditions may result in customers having to provide rental rate concessions to achieve adequate occupancy rates. The performance of agricultural loans is highly dependent on favorable weather, reasonable costs for seed and fertilizer and the ability to successfully market the product at a profitable margin. The demand for these products is also dependent on macroeconomic conditions that are beyond the control of the borrower.
Non-PCI Noncommercial Loans and Leases
Each originated noncommercial loan is centrally underwritten using automated credit scoring and analysis tools. These credit scoring tools take into account factors such as payment history, credit utilization, length of credit history, types of credit currently in use and recent credit inquiries. To the extent that the loan is secured by collateral, the likely value of that collateral is evaluated.
The ALLL for the non-PCI noncommercial segment is primarily calculated on a pooled basis using a delinquency-based approach. Estimates of incurred losses are based on historical loss experience and the migration of receivables through the various delinquency pools applied to the current risk mix. These estimates may be adjusted through a qualitative assessment to reflect current economic conditions, portfolio trends and other factors. The remaining portion of the ALLL related to the non-PCI noncommercial segment results from loans that are deemed impaired. The impairment assessment and determination of the related specific reserve for each impaired loan is based on the loan's characteristics. Impairment measurement for loans that are not collateral dependent is based on the present value of expected cash flows discounted at the loan's effective interest rate. Specific valuation allowances are established or partial charge-offs are recorded for the difference between the loan amount and the estimated fair value for originated non-PCI loans. Specific valuation allowances for purchased non-impaired loans are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value with consideration for the remaining discounts recognized upon acquisition. Impairment measurement for most real estate loans, particularly when a loan is considered to be a probable foreclosure, is based on the fair value of the underlying collateral. Collateral is appraised and market value, appropriately adjusted for an assessment of the sales and marketing costs as well as the expected holding period, are used to calculate an anticipated fair value.
Common risks to each class of noncommercial loans include risks that are not specific to individual transactions such as general economic conditions within the markets BancShares serves, particularly unemployment and potential declines in real estate values. Personal events such as disability or change in marital status also add risk to noncommercial loans.
In addition to these common risks for the majority of noncommercial loans, additional risks are inherent in certain classes of noncommercial loans.
Revolving mortgage
Revolving mortgage loans are often secured by second liens on residential real estate, thereby making such loans particularly susceptible to declining collateral values. A substantial decline in collateral value could render a second lien position to be effectively unsecured. Additional risks include lien perfection inaccuracies, disputes with first lienholders and uncertainty regarding the customer's performance with respect to the first lien that may further weaken the collateral position. Further, the open-end structure of these loans creates the risk that customers may draw on the lines in excess of the collateral value if there have been significant declines since origination.
Consumer
The consumer loan portfolio includes loans secured by personal property such as automobiles, marketable securities, other titled recreational vehicles including boats and motorcycles, as well as unsecured consumer debt. The value of underlying collateral within this class is especially volatile due to potential rapid depreciation in values since date of loan origination, potentially in excess of principal balances.
Residential mortgage and noncommercial construction and land development
Residential mortgage and noncommercial construction and land development loans are made to individuals and are typically secured by 1-4 family residential property, undeveloped land and partially developed land in anticipation of pending construction of a personal residence. Significant and rapid declines in real estate values can result in residential mortgage loan borrowers having debt levels in excess of the current market value of the collateral. Noncommercial construction and land development projects can experience delays in completion and cost overruns that exceed the borrower's financial ability to complete the project. Such cost overruns can routinely result in foreclosure of partially completed and unmarketable collateral.
PCI Loans
The risks associated with PCI loans are generally consistent with the risks identified for commercial and noncommercial non-PCI loans and the classes of loans within those segments. However, these loans were underwritten by other institutions, often with weaker lending standards. Additionally, in some cases, collateral for PCI loans is located in regions that have experienced profound erosion of real estate values. Therefore, there exists a significant risk that PCI loans are not adequately supported by borrower cash flow or the values of underlying collateral.
The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using their effective interest rates has decreased and if so, recognizes provision for loan and lease losses. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
Reserve for Unfunded Commitments
The reserve for unfunded commitments represents the estimated probable losses related to unfunded lending commitments, such as letters of credit, financial guarantees and similar binding commitments. The reserve is calculated in a manner similar to the loans evaluated collectively for impairment, while also considering the timing and likelihood that the available credit will be utilized as well as the exposure upon default. The reserve for unfunded commitments is presented within other liabilities on the Consolidated Balance Sheets, distinct from the ALLL, and adjustments to the reserve for unfunded commitments are included in other noninterest expense in the Consolidated Statements of Income.
Premises and Equipment
Premises, equipment and capital leases are stated at cost less accumulated depreciation and amortization. For financial reporting purposes, depreciation and amortization are computed using the straight-line method and are expensed over the estimated useful lives of the assets, which range from 25 to 40 years for premises and three to 10 years for furniture, software and equipment. Leasehold improvements are amortized over the terms of the respective leases or the useful lives of the improvements, whichever is shorter. Gains and losses on dispositions are recorded in other noninterest expense. Maintenance and repairs are charged to occupancy expense or equipment expense as incurred. Obligations under capital leases are amortized over the life of the lease using the effective interest method to allocate payments between principal and interest. Rent expense and rental income on operating leases are recorded using the straight-line method over the appropriate lease terms.
Goodwill and Other Intangible Assets
BancShares accounts for acquisitions using the acquisition method of accounting. Under acquisition accounting, if the purchase price of an acquired company exceeds the fair value of its net assets, the excess is carried on the acquirer's balance sheet as goodwill. An intangible asset is recognized as an asset apart from goodwill if it arises from contractual or other legal rights or if it is capable of being separated or divided from the acquired entity and sold, transferred, licensed, rented or exchanged. Intangible assets that are separately identifiable assets, such as core deposit intangibles, resulting from acquisitions are amortized on an accelerated basis over an estimated useful life and evaluated for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable.
Goodwill is not amortized, but is evaluated at least annually for impairment or more frequently if events occur or circumstances change that may trigger a decline in the value of the reporting unit or otherwise indicate that a potential impairment exists. Examples of such events or circumstances include deterioration of general economic conditions, limitations on accessing capital, other equity and credit market developments, adverse change(s) in the environment in which BancShares operates, regulatory or political developments and changes in management, key personnel, strategy or customers. The evaluation of goodwill is based on a variety of factors, including common stock trading multiples and data from comparable acquisitions. Potential impairment of goodwill exists when the carrying amount of a reporting unit exceeds its fair value. In accordance with ASC 350, Intangibles - Goodwill and Other, the fair value for the reporting unit is computed using various methods including market capitalization, price-earnings multiples, price-to-tangible book and market premium.
To the extent the reporting unit's carrying amount exceeds its fair value, an indication exists that the reporting unit's goodwill may be impaired, which would require the second step of impairment testing to be performed. In the second step, the implied fair value of the reporting unit's goodwill is determined by allocating the reporting unit's fair value to all of its assets (recognized and unrecognized) and liabilities as if the reporting unit had been acquired in a business combination at the date of the impairment test. If the implied fair value of the reporting unit's goodwill is lower than its carrying amount, goodwill is impaired and is written down to the implied fair value. The loss recognized is limited to the carrying amount of goodwill. Once an impairment loss is recognized, future increases in fair value will not result in the reversal of previously recognized losses.
Annual impairment tests are conducted as of July 31 each year. Based on the July 31, 2014, impairment test, management concluded there was no indication of goodwill impairment. In addition to the annual testing requirement, impairment tests are performed if various other events occur that may trigger a decline in value including significant adverse changes in the business climate, considering various qualitative and quantitative factors to determine whether impairment exists. There were no such events subsequent to the annual impairment test performed during 2014.
Other intangible assets with estimable lives are amortized over their estimated useful lives, which are periodically reviewed for reasonableness. Identifiable intangible assets represent the estimated value of the core deposits acquired and certain customer relationships.
Mortgage servicing rights ("MSRs") are recognized separately when they are acquired through sales of loans originated. When mortgage loans are sold, servicing rights are initially recorded at fair value and gains on sale of loans are recorded within mortgage income in the Consolidated Statements of Income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized against mortgage income in non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans with the offset being a reduction in the cost basis of the servicing asset. MSRs are evaluated for impairment quarterly based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics and is recorded as a reduction of mortgage income in the Consolidated Statements of Income. If BancShares later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the valuation reserve may be recorded as an increase to mortgage income in the Consolidated Statements of Income, but only to the extent of previous impairment recognized.
Securities Sold Under Repurchase Agreements
Securities sold under repurchase agreements generally have maturities of one day and are reflected as short-term borrowings on the Consolidated Balance Sheets and are recorded based on the amount of cash received in connection with the borrowing.
At December 31, 2014 and 2013, BancShares had $294.4 million and $97.0 million of securities sold under repurchase agreements, respectively.
Fair Values
Fair value disclosures are required for all financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value. Under GAAP, individual fair value estimates are ranked on a three-tier scale based on the relative reliability of the inputs used in the valuation. Fair values determined using level 1 inputs rely on active and observable markets to price identical assets or liabilities. In situations where identical assets and liabilities are not traded in active markets, fair values may be determined based on level 2 inputs, which represent observable data for similar assets and liabilities. Fair values for assets and liabilities that are not actively traded in observable markets are based on level 3 inputs, which are considered to be nonobservable. Fair value estimates derived from level 3 inputs cannot be substantiated by comparison to independent markets and, in many cases, cannot be realized through immediate settlement of the instrument. Accordingly, the aggregate fair value amounts presented do not necessarily represent the underlying value to BancShares. For additional information, see Note L to the Consolidated Financial Statements.
Income Taxes
Deferred income taxes are reported when different accounting methods have been used in determining income for income tax purposes and for financial reporting purposes. Deferred taxes are computed using the asset and liability approach as prescribed in ASC 740, Income Taxes. Under this method, a deferred tax asset or liability is determined based on the currently enacted tax rates applicable to the period in which the differences between the financial statement carrying amounts and tax basis of existing assets and liabilities are expected to be reported in BancShares' income tax returns. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date.
BancShares continually monitors and evaluates the potential impact of current events on the estimates used to establish income tax expenses and income tax liabilities. On a periodic basis, BancShares evaluates its income tax positions based on current tax law, positions taken by various tax auditors within the jurisdictions that BancShares is required to file income tax returns, as well as potential or pending audits or assessments by such tax auditors.
BancShares files a consolidated federal income tax return and various combined and separate company state tax returns.
Derivative Financial Instruments
A derivative is a financial instrument that derives its cash flows, and therefore its value, by reference to an underlying instrument, index or referenced interest rate. These instruments include interest rate swaps, caps, floors, collars, options or other financial instruments designed to hedge exposures to interest rate risk or for speculative purposes.
BancShares selectively uses interest rate swaps for interest rate risk management purposes. During 2011, BancShares entered into an interest rate swap that qualifies as a cash flow hedge under GAAP. This interest rate swap converts variable-rate exposure on outstanding debt to a fixed rate. The derivative is valued each quarter and changes in the fair value are recorded on the Consolidated Balance Sheets with an offset to other comprehensive income for the effective portion and an offset to the Consolidated Statements of Income for any ineffective portion. The assessment of effectiveness is performed using the long-haul method. BancShares’ interest rate swap has been fully effective since inception; therefore, changes in the fair value of the interest rate swap have had no impact on net income. There are no speculative derivative financial instruments in any period presented.
In the event of a change in the forecasted cash flows of the underlying hedged item, the related hedge will be terminated, and management will consider the appropriateness of entering into another hedge for the remaining exposure. The fair value of the terminated hedge will be amortized from accumulated other comprehensive income into earnings over the original life of the terminated swap, provided the remaining cash flows are still probable.
Per Share Data
Net income per share has been computed by dividing net income by the average number of both classes of common shares outstanding during each period. BancShares had no potential common stock outstanding in any period.
Cash dividends per share apply to both Class A and Class B common stock. Shares of Class A common stock carry one vote per share, while shares of Class B common stock carry 16 votes per share.
Defined Benefit Pension Plan
BancShares maintains noncontributory defined benefit pension plans to certain qualifying employees. The calculation of the obligations and related expenses under the plans require the use of actuarial valuation methods and assumptions. Actuarial assumptions used in the determination of future values of plan assets and liabilities are subject to management judgment and may differ significantly if different assumptions are used. The discount rate assumption used to measure the plan obligations is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plans are discounted based on this yield curve, and a single discount rate is calculated to achieve the same present value. Refer to Note M in the Consolidated Financial Statements for disclosures related to BancShares' defined benefit pension plans.
Recently Adopted Accounting Pronouncements
Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2014-17, Business Combinations (Topic 805): Pushdown Accounting
The amendments in this ASU provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. An acquired entity should determine whether to elect to apply pushdown accounting for each individual change-in-control event in which an acquirer obtains control of the acquired entity.
BancShares adopted the amendments in ASU 2014-17, effective November 18, 2014, as the amendments in the update are effective upon issuance. After the effective date, an acquired entity can make an election to apply to guidance to future change in control events or to its most recent change in control event. However, if the financial statements for the period in which the most recent change in control event occurred already have been issued or made available to be issued, the application of this guidance would be a change in accounting principle. The adoption did not have an impact on our Consolidated Financial Statements.
FASB ASU 2014-01, Investments - Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects
This ASU permits an accounting policy election to account for investments in qualified affordable housing projects (LIHTC) using the proportional amortization method 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 recognize the net investment performance in the income statement as a component of income tax expense (benefit).
For those investments in qualified affordable housing projects not accounted for using the proportional amortization method, the investment should be accounted for as an equity method investment or a cost method investment in accordance with ASC 970-323.
The decision to apply the proportional amortization method of accounting will be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments.
BancShares early adopted the guidance effective in the fourth quarter of 2014. Previously, LIHTC investments were accounted for under the cost or equity method, and the amortization was recorded as a reduction to other noninterest income, with the tax credits and other benefits received recorded as a component of the provision for income taxes. BancShares believes the proportional amortization method better represents the economics of LIHTC investments and provides users with a better understanding of the returns from such investments than the cost or equity method. LIHTC investments were $57.1 million and $63.6 million for 2014 and 2013, respectively, included in "other assets" on the Consolidated Balance Sheets.
The cumulative effect of the retrospective application of the change in amortization method was a $2.4 million decrease to both "other assets" and "retained earnings" on the Consolidated Balance Sheets as of January 1, 2012. Under the new amortization method of accounting, amortization expense is recognized in income tax expense in the Consolidated Statements of Income and is offset by the tax effect of tax losses and tax credits received from the investments. This change resulted in a reclassification of expense previously recorded as a reduction in other noninterest income to income tax expense along with additional amortization recognized under the new method of accounting in the Consolidated Statements of Income. An additional change resulting from the new amortization method of accounting was that a deferred tax asset or liability no longer exists as a result of these investments, thus in the retrospective application of the new method, the removal of the deferred tax asset previously reported as well as the additional amortization of the investments, both recorded in other assets, reflected in the Consolidated Balance Sheets were removed. We do not believe the impact of this change in accounting principle is material.
FASB ASU 2013-11, Income Taxes (Topic 740)
This ASU states that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require BancShares to use, and BancShares does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date.
The provisions of this ASU were effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. BancShares adopted the guidance effective in the first quarter of 2014. The initial adoption had no effect on our consolidated financial position or consolidated results of operations.
FASB ASU 2013-04, Liabilities
This ASU provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this ASU is fixed at the reporting date, except for obligations addressed within existing guidance in GAAP.
The amendments in this update were effective for fiscal years beginning after December 31, 2013. BancShares adopted the guidance effective first quarter of 2014. The initial adoption did not have any effect on our consolidated financial position or consolidated results of operations.
Recently Issued Accounting Pronouncements
FASB ASU 2014-14, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
This ASU requires a reporting entity to derecognize a mortgage loan and recognize a separate other receivable upon foreclosure if the following conditions are met: the loan has a government guarantee that is not separable from the loan before foreclosure; at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim and at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance expected to be recovered from the guarantor.
The amendments in this ASU are effective for public entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2015.
FASB ASU 2014-11, Transfers and Servicing (Topic 860)
This ASU aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The ASU requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The ASU also requires expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.
The accounting changes in this ASU are effective for fiscal years beginning after December 15, 2014. In addition, the disclosure for certain transactions accounted for as a sale is effective for the fiscal period beginning after December 15, 2014, the disclosures for transactions accounted for as secured borrowings are required to be presented for fiscal periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. Early adoption is not permitted. BancShares will adopt the guidance effective in the first quarter of 2015, and is currently evaluating the impact of the new standard on the financial statement disclosures. BancShares does not anticipate any effect on our consolidated financial position or consolidated results of operations as a result of adoption.
FASB ASU 2014-09, Revenue from Contracts with Customers (Topic 606)
In May 2014, the FASB issued a standard on the recognition of revenue from contracts with customers with the core principle being for companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard also results in enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively and improves guidance for multiple-element arrangements.
The guidance in this ASU is effective for fiscal periods beginning after December 15, 2016, including interim reporting periods within that reporting period. Early adoption is not permitted. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2017 using one of two retrospective application methods.
FASB ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40)
This ASU clarifies that 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. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction.
The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. BancShares will adopt the guidance effective in the first quarter of 2015, and is currently evaluating the impact of the new standard on the financial statement disclosures. BancShares does not anticipate any significant impact on our consolidated financial position or consolidated results of operations as a result of adoption.

Business_Combinations_Business

Business Combinations Business Combinations (Notes)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Business Combinations	BUSINESS COMBINATIONS
	Bancorporation Merger
	On October 1, 2014, BancShares completed the merger of Bancorporation with and into BancShares pursuant to an Agreement and Plan of Merger dated June 10, 2014, as amended on July 29, 2014. FCB-SC merged with and into FCB on January 1, 2015.
	Under the terms of the Merger Agreement, each share of Bancorporation common stock was converted into the right to receive 4.00 shares of BancShares' Class A common stock and $50.00 cash, unless the holder elected for each share to be converted into the right to receive 3.58 shares of BancShares' Class A common stock and 0.42 shares of BancShares' Class B common stock. BancShares issued 2,586,762 Class A common shares at a fair value of $560.4 million and 18,202 Class B common shares at a fair value of $3.9 million to Bancorporation shareholders. Also, cash paid to Bancorporation shareholders was $30.4 million. At the time of the merger, BancShares owned 32,042 shares of common stock in Bancorporation with an approximate fair value of $29.6 million. The fair value of common stock owned by BancShares in Bancorporation is considered part of the purchase price, and the shares ceased to exist after completion of the merger. A gain of $29,129 was recognized on these shares as a result and is included in securities gain on the Consolidated Statement of Income.
	In connection with the Bancorporation merger, BancShares completed an analysis of the control ownership of BancShares and Bancorporation and determined that common control did not exist.
	The merger between BancShares and Bancorporation creates a more diversified financial institution that is better equipped to respond to economic and industry developments. Additionally, cost savings, efficiencies and other benefits are expected from the combined operations.
	The Bancorporation merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities and identifiable intangible assets were recorded at their acquisition date estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the transaction as additional information regarding closing date fair values becomes available.
	The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values.
	(Dollars in thousands)
	Purchase Price
	Value of shares of BancShares Class A common stock issued to Bancorporation shareholders				$	560,370
	Value of shares of BancShares Class B common stock issued to Bancorporation shareholders				3,877
	Cash paid to Bancorporation shareholders				30,394
	Fair value of Bancorporation shares owned by BancShares				29,551
	Total purchase price				624,192
	Assets
	Cash and due from banks	$	194,570
	Overnight investments	1,087,325
	Investment securities available for sale	2,011,263
	Loans held for sale	30,997
	Loans and leases	4,491,067
	Premises and equipment	238,646
	Other real estate owned	35,344
	Income earned not collected	15,266
	FDIC loss share receivable	5,106
	Other intangible assets	109,416
	Other assets	56,367
	Total assets acquired	8,275,367
	Liabilities
	Deposits	7,174,817
	Short-term borrowings	295,681
	Long-term obligations	124,852
	FDIC loss share payable	224
	Other liabilities	59,834
	Total liabilities assumed	$	7,655,408
	Fair value of net assets acquired				619,959
	Goodwill recorded for Bancorporation				$	4,233
	The amount of goodwill recorded reflects the increased market share and related synergies that are expected to result from the acquisition, and represents the excess purchase price over the estimated fair value of the net assets acquired. None of the goodwill is deductible for income tax purposes as the merger is accounted for as a tax-free exchange.
	The operating results of BancShares for the year ended December 31, 2014 include the results from the operations acquired in the Bancorporation transaction since October 1, 2014. Bancorporation's operations contributed approximately $92.8 million in total revenue (interest income plus noninterest income) and an estimated $12.7 million in net income for the period from the acquisition date.
	Merger-related expenses of $8.0 million were recorded in the Consolidated Statement of Income for the year ended December 31, 2014.
	Based on such factors as past due status, nonaccrual status and credit risk ratings, the acquired loans were divided into loans with evidence of credit quality deterioration, which are accounted for under ASC 310-30 (included in PCI loans), and loans that do not meet this criteria, which are accounted for under ASC 310-20 (included in non-PCI loans).
	The following unaudited pro forma financial information reflects the consolidated results of operations of BancShares. These results combine the historical results of Bancorporation in the BancShares' Consolidated Statements of Income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2013. The unaudited pro forma information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the the future results of operations of BancShares.
		Year ended December 31
	(Dollars in thousands, unaudited)	2014			2013
	Total revenue (interest income plus noninterest income)	$	1,336,340		$	1,412,226
	Net income (loss)	$	(13,171	)	$	210,529
	The merger transaction between BancShares and Bancorporation constituted a triggering event for which Bancorporation undertook a goodwill impairment assessment. Based on the analysis performed, Bancorporation determined that its fair value did not support the goodwill recorded; therefore, Bancorporation recorded a $166.8 million goodwill impairment charge to write-off a portion of goodwill prior to the October 1, 2014 effective date of the merger. This goodwill impairment is included in the pro forma financial results for the year ended December 31, 2014.
	1st Financial Merger
	On January 1, 2014, FCB completed its merger with 1st Financial of Hendersonville, NC and its wholly-owned subsidiary, Mountain 1st Bank & Trust Company (Mountain 1st). The merger allowed FCB to expand its presence in Western North Carolina. Mountain 1st had twelve branches located in Asheville, Brevard, Columbus, Etowah, Fletcher, Forest City, Hendersonville, Hickory, Marion, Shelby and Waynesville. FCB requested and received approval from the North Carolina Commissioner of Banks and the FDIC to close seven Mountain 1st branches due to their proximity to legacy FCB branches. The branches in Asheville, Brevard, Fletcher, Forest City, Hendersonville, Hickory and Marion were closed in May 2014. All customer relationships assigned to those branches were transferred to the nearest FCB branch.
	FCB paid $10.0 million to acquire 1st Financial, including payments of $8.0 million to the U.S. Treasury to acquire and subsequently retire 1st Financial's TARP obligation and $2.0 million paid to the shareholders of 1st Financial. As a result of the merger, FCB recorded $32.9 million in goodwill and $3.8 million in core deposit intangibles.
	The 1st Financial merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities and identifiable intangible assets were recorded at their acquisition date estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the transaction as additional information regarding closing date fair values becomes available.
	The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values.
	(Dollars in thousands)
	Purchase Price
	Cash paid to shareholders				$	2,000
	Cash paid to acquire and retire TARP securities				8,000
	Total purchase price				10,000
	Assets
	Cash and due from banks	$	28,194
	Investment securities available for sale	237,438
	Loans held for sale	1,183
	Restricted equity securities	3,776
	Loans	307,927
	Premises and equipment	2,686
Other real estate owned	11,591
Other intangible assets	3,780
Other assets	16,346
Total assets acquired	612,921
Liabilities
Deposits	631,871
Short-term borrowings	406
Other liabilities	3,559
Total liabilities assumed	$	635,836
Fair value of net liabilities assumed				22,915
Goodwill recorded for 1st Financial				$	32,915
The estimated fair values presented in the table above reflect additional information that was obtained during the year ended December 31, 2014, which resulted in changes to the initial fair value estimate of loans as of the acquisition date. After considering this additional information, the estimated fair value of loans decreased $8.4 million. The revised fair value estimate resulted in an increase to goodwill of $8.4 million to $32.9 million. Goodwill recorded for 1st Financial represents future revenues to be derived, including efficiencies that will result from combining operations, and other non-identifiable intangible assets. The 1st Financial transaction is a taxable asset acquisition, and goodwill resulting from the transaction is deductible for income tax purposes.
Merger costs related to the 1st Financial transaction were $5.0 million for the year ended December 31, 2014. Loan related interest income generated from 1st Financial was approximately $15.2 million for the year ended December 31, 2014.
All loans resulting from the 1st Financial transaction were recognized upon acquisition date with a discount attributable, at least in part, to credit quality, and are therefore accounted for as PCI loans under ASC 310-30.

Investments

Investments	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Investments	INVESTMENTS
	The amortized cost and fair value of investment securities classified as available for sale and held to maturity at December 31, 2014 and 2013, were as follows:
		31-Dec-14
	(Dollars in thousands)	Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Investment securities available for sale
	U.S. Treasury	$	2,626,900		$	2,922	$	152		$	2,629,670
	Government agency	908,362			702		247			908,817
	Mortgage-backed securities	3,628,187			16,964		11,847			3,633,304
	Municipal securities	125			1		—			126
	Total investment securities available for sale	$	7,163,574		$	20,589	$	12,246		$	7,171,917
		December 31, 2013
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	U.S. Treasury	$	373,223		$	259	$	45		$	373,437
	Government agency	2,543,223			1,798		792			2,544,229
	Mortgage-backed securities	2,486,297			4,526		43,950			2,446,873
	Equity securities	543			21,604		—			22,147
	Municipal securities	186			1		—			187
	Other	863			—		33			830
	Total investment securities available for sale	$	5,404,335		$	28,188	$	44,820		$	5,387,703
		December 31, 2014
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Investment securities held to maturity
	Mortgage-backed securities	$	518		$	26	$	—		$	544
		December 31, 2013
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Mortgage-backed securities	$	907		$	67	$	—		$	974
	As of December 31, 2013, equity securities included an investment in Bancorporation stock of $21.6 million. Pursuant to the Merger Agreement, the shares of capital stock of Bancorporation held were canceled and ceased to exist when the merger became effective October 1, 2014. Also, a single subordinated debt security, previously classified within Other at December 31, 2013, was called during the second quarter of 2014.
	Investments in mortgage-backed securities primarily represent securities issued by the Government National Mortgage Association, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation. The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Repayments of mortgage-backed securities are dependent on the repayments of the underlying loan balances. Equity securities do not have a stated maturity date.
		December 31, 2014					December 31, 2013
	(Dollars in thousands)	Cost			Fair		Cost			Fair
					value					value
	Investment securities available for sale
	Non-amortizing securities maturing in:
	One year or less	$	447,866		$	447,992	$	839,956		$	840,883
	One through five years	3,087,521			3,090,621		2,077,539			2,077,800
	Mortgage-backed securities	3,628,187			3,633,304		2,486,297			2,446,873
	Equity securities	—			—		543			22,147
	Total investment securities available for sale	$	7,163,574		$	7,171,917	$	5,404,335		$	5,387,703
	Investment securities held to maturity
	Mortgage-backed securities held to maturity	$	518		$	544	$	907		$	974
	For each period presented, securities gains (losses) include the following:
		Year ended December 31
	(Dollars in thousands)	2014			2013		2012
	Gross gains on retirement/sales of investment securities available for sale	$	29,129		$	—	$	2,324
	Gross losses on sales of investment securities available for sale	(33		)	—		(2		)
	Other than temporary impairment loss on equity securities	—			—		(45		)
	Total securities gains	$	29,096		$	—	$	2,277
	The following table provides information regarding securities with unrealized losses as of December 31, 2014 and 2013.
		December 31, 2014
		Less than 12 months					12 months or more					Total
	(Dollars in thousands)	Fair			Unrealized		Fair			Unrealized		Fair		Unrealized
		Value			Losses		Value			Losses		Value		Losses
	Investment securities available for sale:
	U.S. Treasury	$	338,612		$	151	$	1,015		$	1	$	339,627	$	152
	Government agency	261,288			247		—			—		261,288		247
	Mortgage-backed securities	573,374			1,805		831,405			10,042		1,404,779		11,847
Total	$	1,173,274		$	2,203	$	832,420		$	10,043	$	2,005,694	$	12,246
	December 31, 2013
	Less than 12 months					12 months or more					Total
	Fair			Unrealized		Fair			Unrealized		Fair		Unrealized
	Value			Losses		Value			Losses		Value		Losses
Investment securities available for sale:
U.S. Treasury	$	102,105		$	45	$	—		$	—	$	102,105	$	45
Government agency	780,552			761		29,969			31		810,521		792
Mortgage-backed securities	2,221,213			42,876		26,861			1,074		2,248,074		43,950
Other	830			33		—			—		830		33
Total	$	3,104,700		$	43,715	$	56,830		$	1,105	$	3,161,530	$	44,820
Investment securities with an aggregate fair value of $832.4 million have had continuous unrealized losses for more than 12 months as of December 31, 2014 with an aggregate unrealized loss of $10.0 million. As of December 31, 2014, all 86 of these investments are U.S. Treasury and government sponsored enterprise-issued mortgage-backed securities. None of the unrealized losses identified as of December 31, 2014 or December 31, 2013 relate to the marketability of the securities or the issuer’s ability to honor redemption obligations. For all periods presented, BancShares had the ability and intent to retain these securities for a period of time sufficient to recover all unrealized losses. Therefore, none of the securities were deemed to be other than temporarily impaired.
Investment securities having an aggregate carrying value of $4.37 billion at December 31, 2014 and $2.75 billion at December 31, 2013 were pledged as collateral to secure public funds on deposit and certain short-term borrowings, and for other purposes as required by law.

Loans_and_Leases

Loans and Leases	12 Months Ended
	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	LOANS AND LEASES
	BancShares reports purchased credit-impaired ("PCI") and non-PCI loan portfolios separately, and each portfolio is further divided into commercial and non-commercial based on the type of borrower, purpose, collateral, and/or our underlying credit management processes. Additionally, loans are assigned to loan classes, which further disaggregate loans based upon common risk characteristics.
	Commercial – Commercial loans include construction and land development, mortgage, other commercial real estate, commercial and industrial, lease financing and other.
	Construction and land development – Construction and land development consists of loans to finance land for development, investment, and use in a commercial business enterprise; multifamily apartments; and other commercial buildings that may be owner-occupied or income generating investments for the owner.
	Commercial mortgage – Commercial mortgage consists of loans to purchase or refinance owner-occupied nonresidential and investment properties. Investment properties include office buildings and other facilities that are rented or leased to unrelated parties.
	Other commercial real estate – Other commercial real estate consists of loans secured by farmland (including residential farms and other improvements) and multifamily (5 or more) residential properties.
	Commercial and industrial – Commercial and industrial consists of loans or lines of credit to finance corporate credit cards, accounts receivable, inventory and other general business purposes.
	Lease financing – Lease financing consists solely of lease financing agreements.
	Other – Other consists of all other commercial loans not classified in one of the preceding classes. These typically include loans to non-profit organizations such as churches, hospitals, educational and charitable organizations.
	Noncommercial – Noncommercial consist of residential and revolving mortgage, construction and land development, and consumer loans.
	Residential mortgage – Residential real estate consists of loans to purchase, construct or refinance the borrower's primary dwelling, second residence or vacation home.
	Revolving mortgage – Revolving mortgage consists of home equity lines of credit that are secured by first or second liens on the borrower's primary residence.
	Construction and land development – Construction and land development consists of loans to construct the borrower's primary or secondary residence or vacant land upon which the owner intends to construct a dwelling at a future date.
	Consumer – Consumer loans consist of installment loans to finance purchases of vehicles, unsecured home improvements and revolving lines of credit that can be secured or unsecured, including personal credit cards.
	Loans and leases are evaluated at acquisition and where a discount is required at least in part due to credit quality, the non-revolving loans are accounted for under the guidance in ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality.  Loans for which it is probable at acquisition that all required payments will not be collected in accordance with contractual terms are considered PCI loans. PCI loans and leases are recorded at fair value at the date of acquisition. No allowance for loan and lease losses is recorded on the acquisition date as the fair value of the acquired assets incorporates assumptions regarding credit risk. An allowance is recorded if there is additional credit deterioration after the acquisition date. Conversely, Non-PCI loans include originated commercial, originated noncommercial, purchased revolving, and purchased non-impaired loans, or loans that do not have a discount, due at least in part, to credit quality at the time of acquisition. Substantially all loans acquired in the Bancorporation acquisition are accounted for as non-PCI loans. Note A of BancShares' Notes to Consolidated Financial Statements provides additional information.
	Loans and leases outstanding include the following as of the dates indicated:
	(Dollars in thousands)	December 31, 2014			December 31, 2013
	Loans and leases (non-PCI)(1):
	Commercial:
	Construction and land development	550,568			319,847
	Commercial mortgage	7,552,948			6,362,490
	Other commercial real estate	244,875			178,754
	Commercial and industrial	1,988,934			1,081,158
	Lease financing	571,916			381,763
	Other	353,833			175,336
	Total commercial loans	11,263,074			8,499,348
	Noncommercial:
	Residential mortgage	2,520,542			982,421
	Revolving mortgage	2,561,800			2,113,285
	Construction and land development	120,097			122,792
	Consumer	1,117,454			386,452
	Total noncommercial loans	6,319,893			3,604,950
	Total non-PCI loans and leases	17,582,967			12,104,298
	Purchased credit-impaired (PCI) loans:
	Commercial:
	Construction and land development	$	78,079		$	78,915
	Commercial mortgage	577,518			642,891
	Other commercial real estate	40,193			41,381
	Commercial and industrial	27,254			17,254
	Other	3,079			866
	Total commercial loans	726,123			781,307
	Noncommercial:
	Residential mortgage	382,340			213,851
	Revolving mortgage	74,109			30,834
	Construction and land development	912			2,583
	Consumer	3,014			851
	Total noncommercial loans	460,375			248,119
	Total PCI loans	1,186,498			1,029,426
	Total loans and leases	$	18,769,465		$	13,133,724
	(1) Non-PCI loans include originated and purchased non-impaired loans, including non-accrual and TDR loans.
	At December 31, 2014, $3.16 billion in noncovered loans with a lendable collateral value of $2.20 billion were used to secure $240.3 million in FHLB of Atlanta advances, resulting in additional borrowing capacity of $1.96 billion, compared to $2.56 billion in noncovered loans with a lendable collateral value of $1.38 billion used to secure $240.3 million in FHLB of Atlanta advances, resulting additional borrowing capacity of $1.14 billion at December 31, 2013.
	At December 31, 2014, $485.3 million in total loans were covered under loss share agreements, compared to $1.03 billion at December 31, 2013. The loss share protection expired for non-single family residential loans acquired from Temecula Valley Bank ("TVB") and Venture Bank ("VB") during the third quarter of 2014. Also, the loss share protection expired for non-single family residential loans from Georgian Bank ("GB"), a portfolio of loans acquired through the Bancorporation merger. The loan balances at December 31, 2014 for the expired agreements from TVB, VB, and GB are $177.3 million, $61.4 million, and $40.9 million respectively. The remaining decrease in covered loans is due to pay downs and payoffs.
	During the first quarter of 2015, the loss share protection will expire for non-single family residential loans acquired from Sun American Bank ("SAB") and all loans acquired from First Regional Bank ("First Regional"). The loan balances at December 31, 2014 for the expiring agreements from SAB and First Regional are $41.1 million and $73.2 million, respectively. During the third quarter of 2015, the loss share protection will expire for non-single family residential loans from Williamsburg First National Bank ("WFNB"), a portfolio of loans acquired through the Bancorporation merger. Loan balances at December 31, 2014 for the expiring agreements from WFNB are $9.1 million.
	Credit quality indicators
	Loans and leases are monitored for credit quality on a recurring basis. The credit quality indicators used are dependent on the portfolio segment to which the loan relates. Commercial and noncommercial loans and leases have different credit quality indicators as a result of the unique characteristics of the loan segment being evaluated. The credit quality indicators for non-PCI and PCI commercial loans and leases are developed through a review of individual borrowers on an ongoing basis. Each commercial loan is evaluated annually with more frequent evaluation of more severely criticized loans or leases. The credit quality indicators for PCI and non-PCI noncommercial loans are based on the delinquency status of the borrower. As the borrower becomes more delinquent, the likelihood of loss increases. The indicators represent the rating for loans or leases as of the date presented based on the most recent assessment performed. These credit quality indicators are defined as follows:
	Pass – A pass rated asset is not adversely classified because it does not display any of the characteristics for adverse classification.
	Special mention – A special mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, such potential weaknesses may result in deterioration of the repayment prospects or collateral position at some future date. Special mention assets are not adversely classified and do not warrant adverse classification.
	Substandard – A substandard asset is inadequately protected by the current net worth and paying capacity of the borrower or of the collateral pledged, if any. Assets classified as substandard generally have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt. These assets are characterized by the distinct possibility of loss if the deficiencies are not corrected.
	Doubtful – An asset classified as doubtful has all the weaknesses inherent in an asset classified substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable on the basis of currently existing facts, conditions and values.
	Loss – Assets classified as loss are considered uncollectible and of such little value that it is inappropriate to be carried as an asset. This classification is not necessarily equivalent to no potential for recovery or salvage value, but rather that it is not appropriate to defer a full charge-off even though partial recovery may be effected in the future.
	Ungraded – Ungraded loans represent loans that are not included in the individual credit grading process due to their relatively small balances or borrower type. The majority of ungraded loans at December 31, 2014 and December 31, 2013 relate to business credit cards. Business credit card loans are subject to automatic charge-off when they become 120 days past due in the same manner as unsecured consumer lines of credit. The remaining balance is comprised of a small amount of commercial mortgage and other commercial real estate loans. As of December 31, 2013, ungraded loans also included tobacco buyout loans classified as commercial and industrial loans. Final payment from the Commodity Credit Corporation was received during January 2014 for tobacco buyout loans held by FCB.
	The composition of the loans and leases outstanding at December 31, 2014, and December 31, 2013, by credit quality indicator is provided below:
		Non-PCI commercial loans and leases
	(Dollars in thousands)	Construction and land			Commercial			Other		Commercial and		Lease financing		Other		Total non-PCI commercial loans and leases
development			mortgage			commercial real estate		industrial
Grade:
December 31, 2014
Pass	$	525,711		$	7,284,714		$	242,053	$	1,859,415	$	564,319	$	349,111	$	10,825,323
Special mention	20,025			129,247			909		27,683		3,205		1,384		182,453
Substandard	4,720			134,677			1,765		8,878		3,955		3,338		157,333
Doubtful	—			2,366			—		164		365		—		2,895
Ungraded	112			1,944			148		92,794		72		—		95,070
Total	$	550,568		$	7,552,948		$	244,875	$	1,988,934	$	571,916	$	353,833	$	11,263,074
December 31, 2013
Pass	$	308,231		$	6,094,505		$	174,913	$	964,840	$	375,371	$	174,314	$	8,092,174
Special mention	8,620			119,515			1,362		14,686		2,160		982		147,325
Substandard	2,944			141,913			2,216		6,352		3,491		40		156,956
Doubtful	52			5,159			75		144		592		—		6,022
Ungraded	—			1,398			188		95,136		149		—		96,871
Total	$	319,847		$	6,362,490		$	178,754	$	1,081,158	$	381,763	$	175,336	$	8,499,348
	Non-PCI noncommercial loans and leases
(Dollars in thousands)	Residential			Revolving			Construction		Consumer		Total non-PCI noncommercial
	mortgage			mortgage			and land				loans and leases
							development
December 31, 2014
Current	$	2,482,281		$	2,542,807		$	119,094	$	1,110,153	$	6,254,335
30-59 days past due	23,288			11,097			370		4,577		39,332
60-89 days past due	6,018			2,433			486		1,619		10,556
90 days or greater past due	8,955			5,463			147		1,105		15,670
Total	$	2,520,542		$	2,561,800		$	120,097	$	1,117,454	$	6,319,893
December 31, 2013
Current	$	955,300		$	2,095,480		$	121,026	$	382,710	$	3,554,516
30-59 days past due	12,885			10,977			1,193		2,114		27,169
60-89 days past due	4,658			2,378			317		955		8,308
90 days or greater past due	9,578			4,450			256		673		14,957
Total	$	982,421		$	2,113,285		$	122,792	$	386,452	$	3,604,950
	December 31, 2014
(Dollars in thousands)	PCI commercial loans
Grade:	Construction			Commercial			Other		Commercial		Other		Total PCI commercial
	and land			mortgage			commercial		and				loans
	development						real estate		industrial
Pass	$	13,514		$	300,187		$	11,033	$	16,637	$	801	$	342,172
Special mention	6,063			98,724			16,271		4,137		—		125,195
Substandard	53,739			171,920			12,889		6,312		2,278		247,138
Doubtful	2,809			6,302			—		130		—		9,241
Ungraded	1,954			385			—		38		—		2,377
Total	$	78,079		$	577,518		$	40,193	$	27,254	$	3,079	$	726,123
	December 31, 2013
	PCI commercial loans
	Construction			Commercial			Other		Commercial		Other		Total PCI commercial
	and land			mortgage			commercial		and				loans
	development						real estate		industrial
Pass	$	2,619		$	296,824		$	22,225	$	8,021	$	866	$	330,555
Special mention	15,530			125,295			3,431		2,585		—		146,841
Substandard	52,228			179,657			7,012		5,225		—		244,122
Doubtful	7,436			40,471			8,713		1,257		—		57,877
Ungraded	1,102			644			—		166		—		1,912
Total	$	78,915		$	642,891		$	41,381	$	17,254	$	866	$	781,307
	PCI noncommercial loans and leases
(Dollars in thousands)	Residential			Revolving			Construction		Consumer		Total non-PCI noncommercial
	mortgage			mortgage			and land				loans
							development
December 31, 2014
Current	$	326,589		$	68,548		$	506	$	2,582	$	398,225
30-59 days past due	11,432			1,405			—		147		12,984
60-89 days past due	10,073			345			—		25		10,443
90 days or greater past due	34,246			3,811			406		260		38,723
Total	$	382,340		$	74,109		$	912	$	3,014	$	460,375
December 31, 2013
Current	$	162,771		$	26,642		$	1,925	841		$	192,179
30-59 days past due	15,261			2,138			—		3		17,402
60-89 days past due	6,544			—			—		—		6,544
90 days or greater past due	29,275			2,054			658		7		31,994
Total	$	213,851		$	30,834		$	2,583	$	851	$	248,119
The aging of the outstanding non-PCI loans and leases, by class, at December 31, 2014, and December 31, 2013 is provided in the table below. The calculation of days past due begins on the day after payment is due and includes all days through which all required interest or principal has not been paid. Loans and leases 30 days or less past due are considered current due to various grace periods that allow borrowers to make payments within a stated period after the due date and still remain in compliance with the loan agreement.
	December 31, 2014
(Dollars in thousands)	30-59 days			60-89 days			90 days or greater		Total past		Current		Total loans
	past due			past due					due				and leases
Non-PCI loans and leases:
Construction and land development - commercial	$	1,796		$	621		$	385	$	2,802	$	547,766	$	550,568
Commercial mortgage	11,367			4,782			8,061		24,210		7,528,738		7,552,948
Other commercial real estate	206			70			102		378		244,497		244,875
Commercial and industrial	2,843			1,545			378		4,766		1,984,168		1,988,934
Lease financing	1,631			8			2		1,641		570,275		571,916
Residential mortgage	23,288			6,018			8,955		38,261		2,482,281		2,520,542
Revolving mortgage	11,097			2,433			5,463		18,993		2,542,807		2,561,800
Construction and land development - noncommercial	370			486			147		1,003		119,094		120,097
Consumer	4,577			1,619			1,105		7,301		1,110,153		1,117,454
Other	146			1,966			—		2,112		351,721		353,833
Total non-PCI loans and leases	$	57,321		$	19,548		$	24,598	$	101,467	$	17,481,500	$	17,582,967
	December 31, 2013
	30-59 days			60-89 days			90 days or greater		Total past		Current		Total loans
	past due			past due					due				and leases
Non-PCI loans and leases:
Construction and land development - commercial	$	1,603		$	9		$	457	$	2,069	$	317,778	$	319,847
Commercial mortgage	11,131			3,601			14,407		29,139		6,333,351		6,362,490
Other commercial real estate	139			210			470		819		177,935		178,754
Commercial and industrial	3,336			682			436		4,454		1,076,704		1,081,158
Lease financing	789			1,341			101		2,231		379,532		381,763
Residential mortgage	12,885			4,658			9,578		27,121		955,300		982,421
Revolving mortgage	10,977			2,378			4,450		17,805		2,095,480		2,113,285
Construction and land development - noncommercial	1,193			317			256		1,766		121,026		122,792
Consumer	2,114			955			673		3,742		382,710		386,452
Other	—			85			—		85		175,251		175,336
Total non-PCI loans and leases	$	44,167		$	14,236		$	30,828	$	89,231	$	12,015,067	$	12,104,298
The recorded investment, by class, in loans and leases on nonaccrual status, and loans and leases greater than 90 days past due and still accruing at December 31, 2014 and December 31, 2013 for non-PCI loans, were as follows:
	December 31, 2014						December 31, 2013
(Dollars in thousands)	Nonaccrual			Loans and			Nonaccrual		Loans and
	loans and			leases > 90			loans and		leases > 90
	leases			days and			leases		days and
				accruing					accruing
Non-PCI loans and leases:
Construction and land development - commercial	$	343		$	111		$	544	$	—
Commercial mortgage	24,720			1,003			33,529		1,113
Commercial and industrial	1,741			239			1,428		294
Lease financing	374			2			832		—
Other commercial real estate	619			35			1,610		—
Construction and land development - noncommercial	—			147			457		256
Residential mortgage	14,242			3,191			14,701		1,998
Revolving mortgage	—			5,463			—		4,450
Consumer	—			1,059			69		673
Other	1,966			—			—		—
Total non-PCI loans and leases	$	44,005		$	11,250		$	53,170	$	8,784
Purchased credit-impaired (PCI) loans
The following table relates to PCI loans acquired in the Bancorporation and 1st Financial mergers, and summarizes the contractually required payments, which include principal and interest, expected cash flows to be collected, and the fair value of PCI loans and leases at the respective merger date.
(Dollars in thousands)
Contractually required payments	$	828,156
Cash flows expected to be collected	$	735,381
Fair value of loans at acquisition	$	623,408
The recorded fair values of PCI loans acquired in the Bancorporation and 1st Financial transaction as of their respective merger dates are as follows:
(Dollars in thousands)
Commercial:
Construction and land development	$	69,789
Commercial mortgage	176,841
Other commercial real estate	15,425
Commercial and industrial	37,583
Other	2,219
Total commercial loans	301,857
Noncommercial:
Residential mortgage	287,675
Revolving mortgage	29,777
Construction and land development	199
Consumer	3,900
Total noncommercial loans	321,551
Total PCI loans	$	623,408
The following table provides changes in the carrying value of purchased credit-impaired loans during the years ended December 31, 2014 and 2013:
(Dollars in thousands)	2014			2013
Balance at January 1	$	1,029,426		$	1,809,235
Fair value of PCI loans acquired during the year	623,408			—
Accretion	112,368			224,672
Payments received and other changes, net	(578,704		)	(1,004,481		)
Balance at December 31	$	1,186,498		$	1,029,426
Unpaid principal balance at December 31	$	2,057,691		$	1,833,955
The carrying value of loans on the cost recovery method was $33.4 million at December 31, 2014, and $28.5 million at December 31, 2013. The cost recovery method is applied to loans when the timing of future cash flows is not reasonably estimable due to borrower nonperformance or uncertainty in the ultimate disposition of the asset.
For PCI loans, improved cash flow estimates and receipt of unscheduled loan payments result in the reclassification of nonaccretable difference to accretable yield. Accretable yield resulting from the improved ability to estimate future cash flows generally does not represent amounts previously identified as nonaccretable difference.
The following table documents changes to the amount of accretable yield for 2014 and 2013.
(Dollars in thousands)	2014			2013
Balance at January 1	$	439,990		$	539,564
Additions from acquisitions	111,973			—
Accretion	(112,368		)	(224,672		)
Reclassifications from nonaccretable difference	7,865			92,349
Changes in expected cash flows that do not affect nonaccretable difference	(29,300		)	32,749
Balance at December 31	$	418,160		$	439,990
Purchased non-impaired loans and leases
The following table relates to purchased non-impaired loans and leases and provides the contractually required payments, estimate of contractual cash flows not expected to be collected and fair value of the acquired loans at the merger date.
(Dollars in thousands)
Contractually required payments	$	4,708,681
Contractual cash flows not expected to be collected	$	59,187
Fair value at acquisition date	$	4,175,586
The recorded fair values of purchased non-impaired loans and leases acquired in the Bancorporation transaction as of the merger date is as follows:
(Dollars in thousands)
Commercial:
Construction and land development	$	134,941
Commercial mortgage	951,794
Other commercial real estate	61,856
Commercial and industrial	431,367
Lease financing	72,563
Other	95,379
Total commercial loans and leases	1,747,900
Noncommercial:
Residential mortgage	1,305,140
Revolving mortgage	419,106
Construction and land development	7,165
Consumer	696,275
Total noncommercial loans and leases	2,427,686
Total non-PCI loans and leases	$	4,175,586
The unamortized discount related to the purchased non-impaired loans and leases acquired in the Bancorporation merger totaled $61.2 million at December 31, 2014.

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2014
Allowance for Loan and Lease Losses, Adjustments, Net [Abstract]
Allowance for Loan and Lease Losses	ALLOWANCE FOR LOAN AND LEASE LOSSES
	Activity in the allowance for loan and lease losses is as follows:
		Non-PCI			PCI				Total
	(dollars in thousands)
	Balance at December 31, 2011	$	180,883		$	89,261			$	270,144
	Provision for loan and lease losses	42,046			100,839				142,885
	Loans and leases charged off	(50,208		)	(50,270		)		(100,478		)
	Loans and leases recovered	6,325			142				6,467
	Net charge-offs	(43,883		)	(50,128		)		(94,011		)
	Balance at December 31, 2012	179,046			139,972				319,018
	Reclassification (1)	7,368			—				7,368
	Provision (credit) for loan and lease losses	19,289			(51,544		)		(32,255		)
	Loans and leases charged off	(33,118		)	(34,908		)		(68,026		)
	Loans and leases recovered	7,289			—				7,289
	Net charge-offs	(25,829		)	(34,908		)		(60,737		)
	Balance at December 31, 2013	179,874			53,520				233,394
	Provision (credit) for loan and lease losses	15,260			(14,620		)		640
	Loans and leases charged off	(20,499		)	(17,271		)		(37,770		)
	Loans and leases recovered	8,202			—				8,202
	Net charge-offs	(12,297		)	(17,271		)		(29,568		)
	Balance at December 31, 2014	$	182,837		$	21,629			$	204,466
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	Activity in the allowance for loan and lease losses, ending balances of loans and leases and related allowance by class of loans is summarized as follows:
		For the twelve months ended December 31, 2014, 2013, and 2012
		Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Non-			Total
		and land			mortgage				commercial				and				financing						mortgage			mortgage			and land						specific
		development							real estate				industrial																development
		- commercial																											- non-
																													commercial
	(Dollars in thousands)
	Non-PCI Loans
	Allowance for loan and lease losses:
	Balance at January 1, 2012	$	5,467		$	67,486			$	2,169			$	23,723			$	3,288		$	1,315		$	8,879		$	27,045		$	1,427		$	25,962		$	14,122		$	180,883
	Provision (credits)	9,665			18,198				130				(4,982		)		498			(116		)	(782		)	8,783			1,161			7,763			1,728			42,046
	Charge-offs	(9,546		)	(7,081		)		(254		)		(5,472		)		(361		)	(28		)	(4,790		)	(11,341		)	(1,047		)	(10,288		)	—			(50,208		)
	Recoveries	445			1,626				14				781				96			4			529			698			180			1,952			—			6,325
	Balance at December 31, 2012	6,031			80,229				2,059				14,050				3,521			1,175			3,836			25,185			1,721			25,389			15,850			179,046
	Reclassification (1)	5,141			27,421				(815		)		7,551				(253		)	(1,288		)	5,717			(9,838		)	(478		)	(10,018		)	(15,772		)	7,368
	Provision (credits)	2,809			(4,485		)		(32		)		4,333				1,646			308			2,786			6,296			(379		)	6,085			(78		)	19,289
	Charge-offs	(4,685		)	(3,904		)		(312		)		(4,785		)		(272		)	(6		)	(2,387		)	(6,064		)	(392		)	(10,311		)	—			(33,118		)
	Recoveries	1,039			996				109				1,213				107			1			559			660			209			2,396			—			7,289
	Balance at December 31, 2013	10,335			100,257				1,009				22,362				4,749			190			10,511			16,239			681			13,541			—			179,874
	Provision (credits)	1,735			(16,746		)		(401		)		10,441				(473		)	3,007			1,219			6,301			245			9,932			—			15,260
	Charge-offs	(316		)	(1,147		)		—				(3,014		)		(100		)	(13		)	(1,260		)	(4,744		)	(118		)	(9,787		)	—			(20,499		)
	Recoveries	207			2,825				124				938				110			—			191			854			84			2,869			—			8,202
	Balance at December 31, 2014	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	—		$	182,837
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	The commercial mortgage loan class had a net credit provision of $16.7 million for the year ended December 31, 2014 compared to a net credit provision of $4.5 million for the year ended December 31, 2013. The increase in the net credit provision was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The provision expense for commercial and industrial loans totaled $10.4 million for the year ended December 31, 2014 compared to $4.3 million for the year ended December 31, 2013. Loan growth of $907.8 million during the year was the primary result of the increase in provision expense.
	The provision for lease financing was a net credit of $0.5 million for the year ended December 31, 2014 compared to a provision expense of $1.6 million for the year ended December 31, 2013. The decrease was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The other loan class had a provision expense of $3.0 million for the year ended December 31, 2014 compared to a provision expense of $0.3 million for the year ended December 31, 2013. The increase in the provision expense was attributable to newly originated loans as well as declining trends in credit risk ratings and defaults.
		December 31, 2014
	(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
		and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
		development							real estate																				development
		- commercial																											- non-commercial
	Non-PCI Loans
	Allowance for loan and lease losses:
	ALLL for loans and leases individually evaluated for impairment	$	92		$	8,610			$	112			$	1,743			$	150		$	1,972		$	1,360		$	1,052		$	71		$	555		$	15,717
	ALLL for loans and leases collectively evaluated for impairment	11,869			76,579				620				28,984				4,136			1,212			9,301			17,598			821			16,000			167,120
	Total allowance for loan and lease losses	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	182,837
	Loans and leases:
	Loans and leases individually evaluated for impairment	$	1,620		$	82,803			$	584			$	11,040			$	623		$	2,000		$	14,913		$	3,675		$	1,340		$	995		$	119,593
	Loans and leases collectively evaluated for impairment	548,948			7,470,145				244,291				1,977,894				571,293			351,833			2,505,629			2,558,125			118,757			1,116,459			17,463,374
Total loan and leases	$	550,568		$	7,552,948			$	244,875			$	1,988,934			$	571,916		$	353,833		$	2,520,542		$	2,561,800		$	120,097		$	1,117,454		$	17,582,967
	December 31, 2013
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
	development							real estate																				development
	- commercial																											- non-commercial
Non-PCI Loans
Allowance for loan and lease losses:
ALLL for loans and leases individually evaluated for impairment	$	103		$	6,873			$	209			$	771			$	54		$	—		$	1,586		$	372		$	72		$	121		$	10,161
ALLL for loans and leases collectively evaluated for impairment	$	10,232		$	93,384			$	800			$	21,591			$	4,695		$	190		$	8,925		$	15,867		$	609		$	13,420		$	169,713
Total allowance for loan and lease losses	$	10,335		$	100,257			$	1,009			$	22,362			$	4,749		$	190		$	10,511		$	16,239		$	681		$	13,541		$	179,874
Loans and leases:
Loans and leases individually evaluated for impairment	$	2,272		$	97,111			$	1,878			$	9,300			$	188		$	—		$	15,539		$	3,596		$	1,108		$	1,154		$	132,146
Loans and leases collectively evaluated for impairment	317,575			6,265,379				176,876				1,071,858				381,575			175,336			966,882			2,109,689			121,684			385,298			11,972,152
Total loan and leases	$	319,847		$	6,362,490			$	178,754			$	1,081,158			$	381,763		$	175,336		$	982,421		$	2,113,285		$	122,792		$	386,452		$	12,104,298
In the non-PCI commercial mortgage segment, loans and leases individually evaluated for impairment decreased $14.3 million to $82.8 million as of December 31, 2014 due to credit quality improvement as certain loans were no longer considered impaired during 2014 and fewer loans were identified for impairment. Reserves on impaired commercial mortgage loans increased $1.7 million due to cash flow deterioration on various individual large relationships.
Other loans and leases individually evaluated for impairment increased $2.0 million as of December 31, 2014 primarily due to one lending relationship which was almost fully reserved due to the loan being placed on nonaccrual status and being unsecured.
Non-PCI loans and leases individually evaluated for impairment decreased $12.6 million to $119.6 million at December 31, 2014 in comparison to December 31, 2013 due to continued credit quality improvements, primarily in the commercial mortgage portfolio. In contrast, Non-PCI loans and leases collectively evaluated for impairment increased $5.49 billion from December 31, 2013 to December 31, 2014. This increase is driven by the addition of non-PCI loans acquired in the Bancorporation merger of $4.18 billion as of the acquisition date and originated loan growth.
	For the twelve months ended December 31, 2014, 2013, and 2012
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and				financing			mortgage			mortgage			and land			and other
	development -							real estate				industrial													development -
	commercial																								noncommercial
PCI Loans
Allowance for loan and lease losses:
Balance at January 1, 2012	$	16,693		$	39,557			$	16,862			$	5,500			$	13		$	5,433		$	77		$	4,652		$	474		$	89,261
Provision (credits)	23,160			34,227				(4,372		)		11,839				(13		)	18,401			10,796			6,520			281			100,839
Charge-offs	(8,667		)	(23,509		)		(1,256		)		(8,442		)		—			(4,139		)	(1,119		)	(2,885		)	(253		)	(50,270		)
Recoveries	—			—				—				—				—			142			—			—			—			142
Balance at December 31, 2012	31,186			50,275				11,234				8,897				—			19,837			9,754			8,287			502			139,972
Provision (credits)	(22,942		)	(3,872		)		(8,949		)		470				—			(5,487		)	(6,399		)	(4,170		)	(195		)	(51,544		)
Charge-offs	(6,924		)	(16,497		)		(931		)		(4,092		)		—			(2,548		)	(396		)	(3,435		)	(85		)	(34,908		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2013	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Provision (credits)	1,284			(7,903		)		(1,385		)		(2,023		)		—			(5,576		)	1,523			(395		)	(145		)	(14,620		)
Charge-offs	(2,454		)	(11,868		)		106				(2,012		)		—			(406		)	(483		)	(104		)	(50		)	(17,271		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2014	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
December 31, 2014
ALLL for loans and leases acquired with deteriorated credit quality	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
Loans and leases acquired with deteriorated credit quality	78,079			577,518				40,193				27,254				—			382,339			74,109			912			6,094			1,186,498
December 31, 2013
ALLL for loans and leases acquired with deteriorated credit quality	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Loans and leases acquired with deteriorated credit quality	78,915			642,891				41,381				17,254				—			213,851			30,834			2,583			1,717			1,029,426
At December 31, 2014 and December 31, 2013, $285.6 million and $459.9 million, respectively, in PCI loans experienced an adverse change in expected cash flows since the date of acquisition.
The following tables provide information on non-PCI impaired loans and leases, exclusive of loans and leases evaluated collectively as a homogeneous group, including interest income recognized in the period during which the loans and leases were considered impaired.
	December 31, 2014
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	996		$	624			$	1,620			$	6,945			$	92
Commercial mortgage	57,324			25,479				82,803				87,702				8,610
Other commercial real estate	112			472				584				913				112
Commercial and industrial	10,319			721				11,040				12,197				1,743
Lease financing	319			304				623				623				150
Other	2,000			—				2,000				2,000				1,972
Residential mortgage	10,198			4,715				14,913				15,746				1,360
Revolving mortgage	3,675			—				3,675				4,933				1,052
Construction and land development - noncommercial	1,077			263				1,340				1,340				71
Consumer	987			8				995				1,067				555
Total non-PCI impaired loans and leases	$	87,007		$	32,586			$	119,593			$	133,466			$	15,717
	December 31, 2013
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	1,025		$	1,247			$	2,272			$	7,306			$	103
Commercial mortgage	57,819			39,292				97,111				103,522				6,873
Other commercial real estate	783			1,095				1,878				2,279				209
Commercial and industrial	7,197			2,103				9,300				10,393				771
Lease financing	133			55				188				188				54
Residential mortgage	11,534			4,005				15,539				15,939				1,586
Revolving mortgage	3,382			214				3,596				3,596				372
Construction and land development - noncommercial	651			457				1,108				1,108				72
Consumer	1,154			—				1,154				1,154				121
Total non-PCI impaired loans and leases	$	83,678		$	48,468			$	132,146			$	145,485			$	10,161
The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2014, 2013 and 2012:
	Year ended December 31, 2014
(Dollars in thousands)	YTD			YTD Interest Income Recognized
	Average
	Balance
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	1,689		$	83
Commercial mortgage	86,250			3,698
Other commercial real estate	2,125			80
Commercial and industrial	13,433			580
Lease financing	774			44
Other	528			29
Residential mortgage	15,487			593
Revolving mortgage	3,922			134
Construction and land development - noncommercial	1,678			98
Consumer	1,535			88
Total non-PCI impaired loans and leases	$	127,421		$	5,427
	Year ended December 31, 2013
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	6,414		$	270
Commercial mortgage	105,628			5,702
Other commercial real estate	2,658			144
Commercial and industrial	12,772			642
Lease financing	350			22
Other	—			—
Residential mortgage	15,470			444
Revolving mortgage	5,653			485
Construction and land development - noncommercial	958			55
Consumer	1,427			53
Total non-PCI impaired loans and leases	$	151,330		$	7,817
	Year ended December 31, 2012
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	22,493		$	399
Commercial mortgage	96,082			4,630
Other commercial real estate	2,690			142
Commercial and industrial	13,658			788
Lease financing	497			37
Other	424			23
Residential mortgage	14,951			586
Revolving mortgage	2,931			68
Construction and land development - noncommercial	2,850			41
Consumer	1,850			21
Total non-PCI impaired loans and leases	$	158,426		$	6,735
Troubled Debt Restructurings
BancShares accounts for certain loan modifications or restructurings as TDRs. In general, the modification or restructuring of a loan is considered a TDR if, for economic reasons or legal reasons related to a borrower's financial difficulties, a concession is granted to the borrower that creditors would not otherwise consider. Concessions may relate to the contractual interest rate, maturity date, payment structure or other actions. In accordance with GAAP, loans acquired under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, excluding pooled loans, are not initially considered to be TDRs, but can be classified as such if a modification is made subsequent to acquisition. Subsequent modification of a PCI loan accounted for in a pool that would otherwise meet the definition of a TDR is not reported, or accounted for, as a TDR since pooled PCI loans are excluded from the scope of TDR accounting.
The following table provides a summary of total TDRs by accrual status.
	December 31, 2014											December 31, 2013
(Dollars in thousands)	Accruing			Nonaccruing				Total				Accruing				Nonaccruing			Total
Commercial loans
Construction and land development - commercial	$	2,591		$	446			$	3,037			$	21,032			$	1,002		$	22,034
Commercial mortgage	92,184			8,937				101,121				113,323				23,387			136,710
Other commercial real estate	2,374			449				2,823				3,470				1,150			4,620
Commercial and industrial	9,864			664				10,528				9,838				1,142			10,980
Lease	258			365				623				49				—			49
Other	34			—				34				—				—			—
Total commercial loans	107,305			10,861				118,166				147,712				26,681			174,393
Noncommercial
Residential	22,597			4,655				27,252				23,343				3,663			27,006
Revolving mortgage	3,675			—				3,675				3,095				—			3,095
Construction and land development - noncommercial	1,391			—				1,391				651				457			1,108
Consumer and other	995			—				995				1,154				—			1,154
Total noncommercial loans	28,658			4,655				33,313				28,243				4,120			32,363
Total loans	$	135,963		$	15,516			$	151,479			$	175,955			$	30,801		$	206,756
Total troubled debt restructurings at December 31, 2014, equaled $151.5 million, of which $46.9 million were PCI and $104.6 million were non-PCI. TDRs at December 31, 2013, totaled $206.8 million, which consisted of $102.3 million PCI and $104.4 million non-PCI.
The majority of TDRs are included in the special mention, substandard or doubtful grading categories, which results in more elevated loss expectations when determining the expected cash flows that are used to determine the allowance for loan losses associated with these loans. When a restructured loan subsequently defaults, it is evaluated and downgraded if appropriate. The more severely graded the loan, the lower the estimated expected cash flows and the greater the allowance recorded. Further, TDRs over $500,000 and graded substandard or lower are evaluated individually for impairment through a review of collateral values.
.
The following tables provide the types of TDRs made during the twelve months ended December 31, 2014, and 2013, as well as a summary of loans that were modified as a TDR during the 12 months ended December 31, 2014, and 2013 that subsequently defaulted during the
twelve months ended December 31, 2014, and 2013. BancShares defines payment default as movement of the TDR to nonaccrual status, which is generally 90 days past due for TDRs, foreclosure or charge-off, whichever occurs first.
	Year ended December 31, 2014									Year ended December 31, 2013
	All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
	Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
(Dollars in thousands)
Non-PCI loans and leases
Interest only period provided
Commercial mortgage	6	$	1,973		2	$	364			6	$	1,520			1	$	—
Commercial and industrial	3	250			—	—				2	397				—	—
Lease financing	2	118			—	—				—	—				—	—
Other commercial real estate	—	—			—	—				1	—				—	—
Residential mortgage	—	—			—	—				1	630				—	—
Other	1	34			—	—				—	—				—	—
Total interest only	12	2,375			2	364				10	2,547				1	—
Loan term extension
Construction and land development - commercial	2	187			—	—				—	—				—	—
Commercial mortgage	18	4,848			—	—				9	3,270				—	—
Commercial and industrial	5	2,274			—	—				1	47				—	—
Lease financing	6	198			—	—				—	—				—	—
Residential mortgage	19	572			—	—				11	539				—	—
Construction and land development - noncommercial	7	226			—	—				—	—				—	—
Consumer	6	99			1	—				2	62				—	—
Total loan term extension	63	8,404			1	—				23	3,918				—	—
Below market interest rate
Construction and land development - commercial	11	372			—	—				3	609				—	—
Commercial mortgage	44	12,642			3	441				28	10,873				1	295
Commercial and industrial	13	751			—	—				3	851				—	—
Other commercial real estate	1	337			—	—				2	378				—	—
Residential mortgage	41	2,444			1	45				21	1,235				—	—
Revolving mortgage	5	217			—	—				13	801				3	451
Construction & land development - noncommercial	12	389			—	—				4	269				—	—
Consumer	10	193			—	—				3	219				—	—
Total below market interest rate	137	17,345			4	486				77	15,235				4	746
Discharged from bankruptcy
Commercial mortgage	2	949			1	—				—	—				—	—
Residential mortgage	12	1,067			2	268				7	510				2	60
Revolving mortgage	17	663			1	—				31	2,577				6	274
Construction & land development - noncommercial	1	62			1	62				—	—				—	—
Consumer	4	4			—	—				—	—				—	—
Total discharged from bankruptcy	36	2,745			5	330				38	3,087				8	334
Total non-PCI restructurings	248	$	30,869		12	$	1,180			148	$	24,787			13	$	1,080
	Year ended December 31, 2014									Year ended December 31, 2013
	All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
	Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
(Dollars in thousands)
PCI loans
Interest only period provided
Construction and land development - commercial	—	$	—		—	$	—			1	$	2,590			1	$	2,590
Commercial mortgage	2	—			2	—				5	2,880				1	299
Commercial and industrial	—	—			—	—				1	21				—	—
Residential mortgage	—	—			—	—				1	39				—	—
Total interest only	2	—			2	—				8	5,530				2	2,889
Loan term extension
Construction and land development - commercial	1	332			—	—				6	2,247				—	—
Commercial mortgage	—	—			—	—				1	157				1	157
Commercial and industrial	—	—			—	—				2	1,080				—	—
Residential mortgage	2	317			5	53				3	5,153				2	5,120
Construction and land development - noncommercial	1	51			—	—				—	—				—	—
Total loan term extension	4	700			5	53				12	8,637				3	5,277
Below market interest rate
Construction and land development - commercial	2	116			—	—				2	106				—	—
Commercial mortgage	16	5,783			3	138				12	7,513				4	2,418
Commercial and industrial	—	—			—	—				2	493				—	—
Residential mortgage	29	3,948			3	23				10	2,088				5	1,475
Total below market interest rate	47	9,847			6	161				26	10,200				9	3,893
Discharged from bankruptcy
Residential mortgage	26	1,659			2	—				—	—				—	—
Total discharged from bankruptcy	26	1,659			2	—				—	—				—	—
Other concession
Commercial mortgage	—	—			—	—				1	110				—	—
Total other concession	—	—			—	—				1	110				—	—
Total PCI restructurings	79	$	12,206		15	$	214			47	$	24,477			14	$	12,059
The following tables provide information on non-PCI impaired loans and leases, exclusive of loans and leases evaluated collectively as a homogeneous group, including interest income recognized in the period during which the loans and leases were considered impaired.
	December 31, 2014
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	996		$	624			$	1,620			$	6,945			$	92
Commercial mortgage	57,324			25,479				82,803				87,702				8,610
Other commercial real estate	112			472				584				913				112
Commercial and industrial	10,319			721				11,040				12,197				1,743
Lease financing	319			304				623				623				150
Other	2,000			—				2,000				2,000				1,972
Residential mortgage	10,198			4,715				14,913				15,746				1,360
Revolving mortgage	3,675			—				3,675				4,933				1,052
Construction and land development - noncommercial	1,077			263				1,340				1,340				71
Consumer	987			8				995				1,067				555
Total non-PCI impaired loans and leases	$	87,007		$	32,586			$	119,593			$	133,466			$	15,717
	December 31, 2013
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	1,025		$	1,247			$	2,272			$	7,306			$	103
Commercial mortgage	57,819			39,292				97,111				103,522				6,873
Other commercial real estate	783			1,095				1,878				2,279				209
Commercial and industrial	7,197			2,103				9,300				10,393				771
Lease financing	133			55				188				188				54
Residential mortgage	11,534			4,005				15,539				15,939				1,586
Revolving mortgage	3,382			214				3,596				3,596				372
Construction and land development - noncommercial	651			457				1,108				1,108				72
Consumer	1,154			—				1,154				1,154				121
Total non-PCI impaired loans and leases	$	83,678		$	48,468			$	132,146			$	145,485			$	10,161
The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2014, 2013 and 2012:
	Year ended December 31, 2014
(Dollars in thousands)	YTD			YTD Interest Income Recognized
	Average
	Balance
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	1,689		$	83
Commercial mortgage	86,250			3,698
Other commercial real estate	2,125			80
Commercial and industrial	13,433			580
Lease financing	774			44
Other	528			29
Residential mortgage	15,487			593
Revolving mortgage	3,922			134
Construction and land development - noncommercial	1,678			98
Consumer	1,535			88
Total non-PCI impaired loans and leases	$	127,421		$	5,427
	Year ended December 31, 2013
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	6,414		$	270
Commercial mortgage	105,628			5,702
Other commercial real estate	2,658			144
Commercial and industrial	12,772			642
Lease financing	350			22
Other	—			—
Residential mortgage	15,470			444
Revolving mortgage	5,653			485
Construction and land development - noncommercial	958			55
Consumer	1,427			53
Total non-PCI impaired loans and leases	$	151,330		$	7,817
	Year ended December 31, 2012
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	22,493		$	399
Commercial mortgage	96,082			4,630
Other commercial real estate	2,690			142
Commercial and industrial	13,658			788
Lease financing	497			37
Other	424			23
Residential mortgage	14,951			586
Revolving mortgage	2,931			68
Construction and land development - noncommercial	2,850			41
Consumer	1,850			21
Total non-PCI impaired loans and leases	$	158,426		$	6,735

Premises_and_Equipment_Notes

Premises and Equipment (Notes)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PREMISES and EQUIPMENT	PREMISES AND EQUIPMENT
	Major classifications of premises and equipment at December 31, 2014 and 2013 are summarized as follows:
	(Dollars in thousands)	2014		2013
	Land	$	295,090	$	204,259
	Premises and leasehold improvements	1,045,718		875,511
	Furniture and equipment	444,774		394,348
	Total	1,785,582		1,474,118
	Less accumulated depreciation and amortization	660,501		597,596
	Total premises and equipment	$	1,125,081	$	876,522
	There were no premises pledged to secure borrowings at December 31, 2014 and 2013.
	BancShares leases certain premises and equipment under various lease agreements that provide for payment of property taxes, insurance and maintenance costs. Operating leases frequently provide for one or more renewal options on the same basis as current rental terms. However, certain leases require increased rentals under cost of living escalation clauses. Some leases also provide purchase options.
	Future minimum rental commitments for noncancellable operating leases with initial or remaining terms of one or more years consisted of the following at December 31, 2014:
	(Dollars in thousands)	Year ended December 31
	2015	$	16,834
	2016	11,598
	2017	8,463
	2018	6,274
	2019	4,445
	Thereafter	40,112
	Total minimum payments	$	87,726
	Total rent expense for all operating leases amounted to $18.5 million in 2014, $21.4 million in 2013 and $23.6 million in 2012, net of rent income, which totaled $2.7 million, $1.8 million and $1.7 million during 2014, 2013 and 2012, respectively.

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 ("OREO")
	The following table explains changes in other real estate owned during 2014 and 2013.
	(Dollars in thousands)	Covered			Noncovered			Total
	Balance at January 1, 2013	$	102,577		$	43,513		$	146,090
	Additions	59,034			33,908			92,942
	Sales	(96,744		)	(36,168		)	(132,912		)
	Writedowns	(17,786		)	(4,355		)	(22,141		)
	Balance at December 31, 2013	47,081			36,898			83,979
	Additions	29,708			36,574			66,282
	Additions acquired in the Bancorporation merger (1)	1,336			34,008			35,344
	Additions acquired in the 1st Financial merger (1)	—			11,591			11,591
	Sales	(38,753		)	(48,935		)	(87,688		)
	Writedowns	(10,853		)	(5,219		)	(16,072		)
	Transfers (2)	$	(5,537	)	$	5,537		$	—
	Balance at December 31, 2014	$	22,982		$	70,454		$	93,436
	(1) These additions relate to the mergers with 1st Financial Services Corporation and First Citizens Bancorporation, Inc. See Note B, "Business Combinations," for a further description.
	(2) Transfers include OREO balances associated with expired loss share agreements.

Receivable_from_FDIC_for_Loss_

Receivable from FDIC for Loss Share Agreements	12 Months Ended
	Dec. 31, 2014
Receivable From FDIC For Loss Share Agreements [Abstract]
Receivable from FDIC for Loss Share Agreements	FDIC LOSS SHARE RECEIVABLE
	The following table provides changes in the receivable from the FDIC for the years ended December 31, 2014, 2013 and 2012:
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	Balance at January 1	$	93,397		$	270,192		$	617,377
	Additional receivable from Bancorporation acquisition	5,106			—			—
	Amortization	(43,422		)	(85,651		)	(102,394		)
	Cash payments to (from) the FDIC	1,286			(19,373		)	(251,972		)
	Post-acquisition adjustments	(27,666		)	(71,771		)	7,181
	Balance at December 31	$	28,701		$	93,397		$	270,192
	The receivable from the FDIC for loss share agreements is measured separately from the related covered assets and is recorded at fair value at the acquisition date using projected cash flows based on the expected reimbursements for losses and the applicable loss share percentages. See Note T for information related to BancShares' recorded payable to the FDIC for loss share agreements.
	Historically, BancShares has had six FDIC-assisted transactions executed in 2009 through 2011. Three additional transactions were assumed as a result of the merger with FCB-SC: Georgian Bank of Atlanta, Georgia (acquired 2009); Williamsburg First National Bank of Williamsburg, South Carolina (acquired 2010); and Atlantic Bank & Trust of Charleston, South Carolina (acquired 2011). The fair value of the FDIC receivable and the activity since the merger are included in the table above.
	Amortization reflects changes in the FDIC loss share receivable due to improvements in expected cash flows that are being recognized over the remaining term of the loss share agreement. Cash payments to (from) the FDIC represent the net impact of loss share loan recoveries, charge-offs and related expenses as calculated and reported in FDIC loss share certificates. Post-acquisition adjustments represent the net change in loss estimates related to acquired loans and covered OREO as a result of changes in expected cash flows and the ALLL related to those covered loans. For loans covered by loss share agreements, subsequent decreases in the amount expected to be collected from the borrower or collateral liquidation result in a provision for loan and lease losses, an increase in the ALLL and a proportional adjustment to the receivable from the FDIC for the estimated amount to be reimbursed. Subsequent increases in the amount expected to be collected from the borrower or collateral liquidation result in the reversal of some or all previously recorded provision for loan and lease losses, a decrease in the related ALLL and a proportional adjustment to the receivable from the FDIC, or prospective adjustment to the accretable yield and the related receivable from the FDIC if no provision for loan and lease losses had been recorded previously. The loss share agreements for non-single family residential loans acquired from Temecula Valley Bank and Venture Bank expired during the third quarter of 2014. Georgian Bank's, a bank acquired through the merger with Bancorporation, loss share agreements for non-single family residential loans also expired in the third quarter of 2014. During the first quarter of 2015, the loss share agreements for First Regional Bank and non-single family residential loans acquired from Sun American Bank will expire. The loss share agreements for non-single family residential loans for Williamsburg First National Bank will expire in the third quarter of 2015.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	DEPOSITS
	Deposits at December 31 are summarized as follows:
	(Dollars in thousands)	2014		2013
	Demand	$	8,086,784	$	5,241,817
	Checking with interest	4,560,565		2,445,972
	Money market accounts	8,319,569		6,306,942
	Savings	1,204,514		1,004,097
	Time	3,507,145		2,875,238
	Total deposits	$	25,678,577	$	17,874,066
	Time deposits with a minimum denomination of $250,000 totaled $552.3 million and $525.5 million at December 31, 2014 and 2013, respectively.
	At December 31, 2014, the scheduled maturities of time deposits were:
	(Dollars in thousands)	Year ended December 31
	2015	$	2,423,786
	2016	701,043
	2017	241,437
	2018	96,949
	2019	43,930
	Thereafter	—
	Total time deposits	$	3,507,145

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2014
Short-term Debt [Abstract]
Short-term Borrowings	SHORT-TERM BORROWINGS
	Short-term borrowings at December 31 are as follows:
	(Dollars in thousands)	2014		2013
	Master notes	$	410,258	$	411,907
	Repurchase agreements	294,426		96,960
	Notes payable to Federal Home Loan Banks	80,000		—
	Federal funds purchased	2,551		2,551
	Subordinated notes payable	199,949		—
	Total short-term borrowings	$	987,184	$	511,418
	At December 31, 2014, BancShares had unused credit lines allowing contingent access to overnight borrowings of up to $750.0 million on an unsecured basis. Additionally, under borrowing arrangements with the Federal Home Loan Bank of Atlanta, BancShares has access to an additional $1.96 billion on a secured basis. The 1st Financial and Bancorporation mergers effective in January 2014 and October 2014, respectively, added $296.1 million of short-term borrowings, including $218.4 million of repurchase agreements and $77.7 million of other short-term borrowings as of the acquisition date. BancShares had $410.3 million in master notes at December 31, 2014. Master notes are investments used by commercial customers as an investment option through a sweep account and are an unsecured debt obligation of BancShares.

LongTerm_Obligations

Long-Term Obligations	12 Months Ended
	Dec. 31, 2014
LONG-TERM OBLIGATIONS [Abstract]
Long-term Obligations	LONG-TERM OBLIGATIONS
	Long-term obligations at December 31 include:
	(Dollars in thousands)	2014			2013
	Junior subordinated debenture at 3-month LIBOR plus 1.75 percent maturing June 30, 2036	$	96,392		$	96,392
	Junior subordinated debenture at 3-month LIBOR plus 2.25 percent maturing June 15, 2034	26,547			—
	Junior subordinated debenture at 3-month LIBOR plus 2.85 percent maturing April 7, 2034	10,000			—
	Subordinated notes payable at 5.125 percent maturing June 1, 2015	—			125,000
	Subordinated notes payable 8.00 percent June 1, 2018	15,000			—
	Obligations under capitalized leases extending to July 2026	3,150			6,515
	Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through September 2021	160,268			240,283
	Note payable to the Federal Home Loan Bank of Seattle with a rate of 4.74 percent and a maturity date of July 2017	10,000			10,000
	Unamortized purchase accounting adjustments	(156		)	2,449
	Other long-term debt	30,119			30,130
	Total long-term obligations	$	351,320		$	510,769
	At December 31, 2014 long-term obligations included $132.9 million in junior subordinated debentures representing obligations to FCB/NC Capital Trust III, FCB/SC Capital Trust II, and SCB Capital Trust I, special purpose entities and grantor trusts for $128.5 million of trust preferred securities. FCB/NC Capital Trust III, FCB/SC Capital Trust II and SCB Capital Trust I's ("the Trusts") trust preferred securities mature in 2036, 2034 and 2034, respectively, and may be redeemed at par in whole or in part at any time. BancShares has guaranteed all obligations of the Trusts.
	Long-term obligations maturing in each of the five years subsequent to December 31, 2014 and thereafter, include:
		Year ended December 31
	2015	$	147
	2016	—
	2017	10,725
	2018	136,104
	2019	—
	Thereafter	204,344
	Total long-term obligations	$	351,320

Estimated_Fair_Values

Estimated Fair Values	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Estimated Fair Values	ESTIMATED FAIR VALUES
	Fair value estimates are intended to represent the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. Where there is no active market for a financial instrument, BancShares has made estimates using discounted cash flows or other valuation techniques. Inputs to these valuation methods are subjective in nature, involve uncertainties and require significant judgment and therefore cannot be determined with precision. Accordingly, the derived fair value estimates presented below are not necessarily indicative of the amounts BancShares could realize in a current market exchange.
	ASC 820, Fair Value Measurements and Disclosures, indicates that assets and liabilities are recorded at fair value according to a fair value hierarchy comprised of three levels. The levels are based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. The level within the fair value hierarchy for an asset or liability is based on the highest level of input that is significant to the fair value measurement (with level 1 considered highest and level 3 considered lowest). A brief description of each level follows:
	•	Level 1 values are based on quoted prices for identical instruments in active markets.
	•	Level 2 values are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market.
	•	Level 3 values are generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates that market participants would use in pricing the asset or liability. Valuation techniques include the use of discounted cash flow models and similar techniques.
	Valuation adjustments, such as those pertaining to counterparty and BancShares' own credit quality and liquidity, may be necessary to ensure that assets and liabilities are recorded at fair value. Credit valuation adjustments are made when market pricing does not accurately reflect the counterparty's credit quality. As determined by BancShares management, liquidity valuation adjustments may be made to the fair value of certain assets to reflect the uncertainty in the pricing and trading of the instruments when we are unable to observe recent market transactions for identical or similar instruments.
	BancShares management reviews any changes to its valuation methodologies to ensure they are appropriate and justified, and refines valuation methodologies as more market-based data becomes available. Transfers between levels of the fair value hierarchy are recognized at the end of the reporting period.
	The methodologies used to estimate the fair value of financial assets and financial liabilities are discussed below:
	Investment securities available for sale. U.S.Treasury, government agency, mortgage-backed securities, municipal securities and trust preferred securities are generally measured at fair value using a third party pricing service or recent comparable market transactions in similar or identical securities and are classified as level 2 instruments. Equity securities are measured at fair value using observable closing prices and the valuation also considers the amount of market activity by examining the trade volume of each security. Due to the relatively inactive nature of the markets for the existing equity securities at BancShares, the inputs used for these equity securities are considered level 2 inputs.
	Loans held for sale. Certain residential real estate loans are originated to be sold to investors, which are carried at fair value as BancShares elected the fair value option on loans held for sale in 2014. The fair value is based on quoted market prices for similar types of loans. Accordingly, the inputs used to calculate fair value of residential real estate loans held for sale are classified as level 2 inputs.
	Net loans and leases (PCI and Non-PCI). Fair value is estimated based on discounted future cash flows using the current interest rates at which loans with similar terms would be made to borrowers of similar credit quality. An additional valuation adjustment is made for liquidity. The inputs used in the fair value measurements for loans and leases are considered level 3 inputs.
	Receivable from the FDIC for loss share agreements. Fair value is estimated based on discounted future cash flows using current discount rates. Due to post-acquisition improvements in expected losses, significant portions of the FDIC receivable will be recovered through amortization of the receivable over the remaining life of the loss share agreement rather than by cash flows from the FDIC. The estimated amounts to be amortized in future periods have no fair value. The inputs used in the fair value measurement for the FDIC receivable are considered level 3 inputs. The FDIC loss share agreements are not transferable and, accordingly, there is no market for this receivable.
	FHLB stock. The carrying amount of FHLB stock is a reasonable estimate of fair value as these securities are not readily marketable and are evaluated for impairment based on the ultimate recoverability of the par value. BancShares considers positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience, when determining the ultimate recoverability of the par value. BancShares believes its investment in FHLB stock is ultimately recoverable at par. The inputs used in the fair value measurement for the FHLB stock are considered level 2 inputs.
	Preferred stock issued under the TARP program and other acquired financial assets. Preferred securities issued under the Troubled Asset Recovery Program are recorded at cost and are evaluated quarterly for impairment based on the ultimate recoverability of the purchase price. The fair value of these securities is derived from a third-party proprietary model that is considered to be a level 3 input. Other acquired financial assets represent acquired investments in various entities for Community Reinvestment Act and correspondent banking purposes. These investments were recorded at fair value at acquisition date based on level 2 inputs.
	Mortgage servicing rights. Mortgage servicing rights are carried at the lower of amortized cost or market and are, therefore, carried at fair value only when fair value is less than the asset cost. The fair value of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and a model that relies on discount rates, estimates of prepayment rates and the weighted average cost to service the loans is used to determine the fair value. The inputs used in the fair value measurement for mortgage servicing rights are considered level 3 inputs.
	Deposits. For non-time deposits, carrying value is a reasonable estimate of fair value. The fair value of time deposits is estimated by discounting future cash flows using the interest rates currently offered for deposits of similar remaining maturities. The inputs used in the fair value measurement for deposits are considered level 2 inputs.
	Long-term obligations. For fixed rate trust preferred securities, the fair values are determined based on recent trades of the actual security if available. For other long-term obligations, fair values are estimated by discounting future cash flows using current interest rates for similar financial instruments. The inputs used in the fair value measurement for long-term obligations are considered level 2 inputs.
	Payable to the FDIC for loss share agreements. The fair value of the payable to the FDIC for loss share agreements is determined by the projected cash flows based on expected payments to the FDIC in accordance with the loss share agreements. Cash flows are discounted using current discount rates to reflect the timing of the estimated amounts due to the FDIC. The inputs used in the fair value measurement for the payable to the FDIC are considered level 3 inputs.
	Interest rate swap. Under the terms of the existing cash flow hedge, BancShares pays a fixed payment to the counterparty in exchange for receipt of a variable payment that is determined based on the three-month LIBOR rate. The fair value of the cash flow hedge is, therefore, based on projected LIBOR rates for the duration of the hedge, values that, while observable in the market, are subject to adjustment due to pricing considerations for the specific instrument. The inputs used in the fair value measurement of the interest rate swap are considered level 2 inputs.
	Off-balance-sheet commitments and contingencies. Carrying amounts are reasonable estimates of the fair values for such financial instruments. Carrying amounts include unamortized fee income and, in some cases, reserves for any credit losses from those financial instruments. These amounts are not material to BancShares' financial position.
	For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of December 31, 2014 and December 31, 2013. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short term in nature and there is no interest rate or credit risk relating to them that would cause the fair value to differ from the carrying value.
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Carrying value			Fair value			Carrying value		Fair value
	Cash and due from banks	$	604,182		$	604,182		$	533,599	$	533,599
	Overnight investments	1,724,919			1,724,919			859,324		859,324
	Investment securities available for sale	7,171,917			7,171,917			5,387,703		5,387,703
	Investment securities held to maturity	518			544			907		974
	Loans held for sale	63,696			63,696			47,271		47,956
	Net loans and leases	18,564,999			18,046,497			12,900,330		12,545,537
	Receivable from the FDIC for loss share agreements (1)	28,701			18,218			93,397		38,438
	Income earned not collected	57,254			57,254			48,390		48,390
	Federal Home Loan Bank stock	39,113			39,113			40,819		40,819
	Preferred stock and other acquired financial assets	13,689			14,708			33,564		34,786
	Mortgage servicing rights	16,688			16,736			16		16
	Deposits	25,678,577			25,164,683			17,874,066		17,898,570
	Short-term borrowings	987,184			987,184			511,418		511,418
	Long-term obligations	351,320			367,732			510,769		526,037
	Payable to the FDIC for loss share agreements	116,535			122,168			109,378		111,941
	Accrued interest payable	8,194			8,194			6,737		6,737
	Interest rate swap	4,337			4,337			7,220		7,220
	(1) The fair value of the FDIC receivable excludes receivable related to accretable yield to be amortized in prospective periods.
	Among BancShares’ assets and liabilities, investment securities available for sale, loans held for sale at December 31, 2014 and interest rate swaps accounted for as cash flow hedges are reported at their fair values on a recurring basis. Certain other assets are adjusted to their fair value on a nonrecurring basis, including impaired loans, OREO, goodwill, which is periodically tested for impairment and mortgage servicing rights, which are carried at the lower of amortized cost or market. Non-impaired loans held for investment, deposits, short-term borrowings and long-term obligations are not reported at fair value.
	For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of December 31, 2014 and December 31, 2013.
		December 31, 2014
					Fair value measurements using:
	(Dollars in thousands)	Fair value			Level 1			Level 2		Level 3
	Assets measured at fair value
	Investment securities available for sale
	U.S. Treasury	$	2,629,670		$	—		$	2,629,670	$	—
	Government agency	908,817			—			908,817		—
	Mortgage-backed securities	3,633,304			—			3,633,304		—
	Municipal securities	126			—			126		—
	Total investment securities available for sale	$	7,171,917		$	—		$	7,171,917	$	—
	Loans held for sale	63,696			—			63,696		—
	Liabilities measured at fair value
	Interest rate swaps accounted for as cash flow hedges	$	4,337		$	—		$	4,337	$	—
		December 31, 2013
					Fair value measurements using:
		Fair value			Level 1			Level 2		Level 3
	Assets measured at fair value
	Investment securities available for sale
	U.S. Treasury	$	373,437		$	—		$	373,437	$	—
	Government agency	2,544,229			—			2,544,229		—
Mortgage-backed securities	2,446,873			—			2,446,873		—
Equity securities	22,147			—			22,147		—
Municipal securities	187			—			187		—
Other	830			—			830		—
Total investment securities available for sale	$	5,387,703		$	—		$	5,387,703	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	7,220		$	—		$	7,220	$	—
As of December 31, 2013, equity securities included an investment in Bancorporation stock of $21.6 million. Pursuant to the Merger Agreement, the shares of capital stock of Bancorporation held were canceled and ceased to exist when the merger became effective October 1, 2014. Also, a single subordinated debt security, previously classified within Other at December 31, 2013, was called during the second quarter of 2014.
There were no transfers between levels during the years ended December 31, 2014 and 2013.
Fair Value Option
Beginning in the fourth quarter of 2014, BancShares has elected the fair value option for residential real estate loans held for sale. This election reduces certain timing differences in the Consolidated Statement of Income and better aligns with the management of the portfolio from a business perspective. As of December 31, 2013, BancShares had not elected the fair value option for any of the loans in the held for sale portfolio.
The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for residential real estate loans held for sale measured at fair value as of December 31, 2014.
	December 31, 2014
(Dollars in thousands)	Fair Value			Aggregate Unpaid Principal Balance			Difference
Loans held for sale	$	63,696		$	62,996		$	700
No loans held for sell were 90 or more days past due or on nonaccrual status as of December 31, 2014.
The changes in fair value for residential real estate loans held for sale for which we elected the fair value option are included in the table below for the year ended December 31, 2014.
	Year ended December 31, 2014
(Dollars in thousands)	Gains(Losses) From Fair Value Changes
Loans held for sale	$	202
The changes in fair value in the table above are recorded as a component of mortgage income on the Consolidated Income Statement.
Certain other assets are adjusted to their fair value on a nonrecurring basis, including impaired loans, OREO, goodwill, which is periodically tested for impairment and mortgage servicing rights, which are carried at the lower of amortized cost or market. Non-impaired loans held for investment, deposits, short-term borrowings and long-term obligations are not reported at fair value.
Impaired loans are deemed to be at fair value if an associated allowance or current period charge-off has been recorded. The value of impaired loans is determined by either collateral valuations or discounted present value of the expected cash flow calculations. Collateral values are determined using appraisals or other third-party value estimates of the subject property with discounts generally between 10 and 14 percent applied for estimated holding and selling costs and other external factors that may impact the marketability of the property. Impaired loans are assigned to an asset manager and monitored monthly for significant changes since the last valuation. If significant changes are noted, the asset manager orders a new valuation or adjusts the valuation accordingly. Expected cash flows are determined using expected payment information at the individual loan level, discounted using the effective interest rate. The effective interest rates generally range between 2 and 16 percent.
OREO is measured and reported at fair value using collateral valuations. Collateral values are determined using appraisals or other third-party value estimates of the subject property with discounts generally between 10 and 14 percent applied for estimated holding and selling costs and other external factors that may impact the marketability of the property. Changes to the value of the assets between scheduled valuation dates are monitored through continued communication with brokers and monthly reviews by the asset manager assigned to each asset. The asset manager uses the information gathered from brokers and other market sources to identify any significant changes in the market or the subject property as they occur. Valuations are then adjusted or new appraisals are ordered to ensure the reported values reflect the most current information. OREO that has been acquired or written down in the current year is deemed to be at fair value and included in the table below.
Mortgage servicing rights are carried at the lower of cost or market and are, therefore, carried at fair value only when fair value is less than the amortized asset cost. The fair value of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and a discounted cash flow model, which takes into consideration discount rates, prepayment rates, and the weighted average cost to service the loans, are used to determine the fair value. See Note R for further information on the discount rates, prepayment rates and the weighted average cost to service the loans.
For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of December 31, 2014 and December 31, 2013.
	December 31, 2014
			Fair value measurements using:
(Dollars in thousands)	Fair value		Level 1			Level 2		Level 3
Impaired loans	73,170		—			—		73,170
Other real estate not covered under loss share agreements remeasured during current year	40,714		—			—		40,714
Other real estate covered under loss share agreements remeasured during current year	17,664		—			—		17,664
Mortgage servicing rights	13,562		—			—		13,562
	December 31, 2013
			Fair value measurements using:
	Fair value		Level 1			Level 2		Level 3
Impaired loans	77,817		—			—		77,817
Other real estate not covered under loss share agreements remeasured during current year	20,526		—			—		20,526
Other real estate covered under loss share agreements remeasured during current year	37,587		—			—		37,587
No financial liabilities were carried at fair value on a nonrecurring basis as of December 31, 2014 and December 31, 2013.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS
	BancShares sponsors benefit plans for its qualifying employees and legacy Bancorporation employees including noncontributory defined benefit pension plans, 401(k) savings plans and enhanced 401(k) savings plans. These plans are qualified under the Internal Revenue Code. BancShares also maintains agreements with certain executives that provide supplemental benefits that are paid upon death or separation from service at an agreed-upon age.
	Defined Benefit Pension Plans
	Legacy BancShares employees who were hired prior to April 1, 2007 and who qualify under length of service and other requirements may participate in a noncontributory defined benefit pension plan (BancShares Plan). Under the BancShares Plan, benefits are based on years of service and average earnings. BancShares made no contributions to the BancShares Plan during 2014 or 2013 and does not anticipate making any contribution during 2015.
	Certain legacy Bancorporation employees are covered by a noncontributory defined benefit pension plan (Bancorporation Plan). Retirement benefits under the Bancorporation Plan are based on an employee’s length of service and highest average annual compensation for five consecutive years during the last ten years of employment. Contributions to the Bancorporation Plan are based upon the projected unit credit actuarial funding method and are limited to the amounts that are currently deductible for tax reporting purposes. Employees had to be employed for at least one year to participate in the Bancorporation Plan. The employees fully vest in the Bancorporation Plan after five years of service. The Bancorporation plan was closed to new participants as of September 1, 2007. No contributions were made to the Bancorporation Plan since the October 1, 2014 acquisition date and none are anticipated for 2015.
	Obligations and Funded Status
	BancShares Plan
	The following table provides the changes in benefit obligation and plan assets and the funded status of the plan at December 31, 2014 and 2013.
	(Dollars in thousands)	2014				2013
	Change in benefit obligation
	Projected benefit obligation at January 1	$	530,678			$	580,938
	Service cost	12,332				16,332
	Interest cost	25,615				23,686
	Actuarial (gain) loss	76,122				(74,060		)
	Benefits paid	(17,102		)		(16,218		)
	Projected benefit obligation at December 31	627,645				530,678
	Change in plan assets
	Fair value of plan assets at January 1	524,017				463,005
	Actual return on plan assets	38,041				77,230
	Employer contributions	—				—
	Benefits paid	(17,102		)		(16,218		)
	Fair value of plan assets at December 31	544,956				524,017
	Funded status at December 31	$	(82,689	)		$	(6,661	)
	The amounts recognized in the consolidated balance sheets as of December 31, 2014 and 2013 consist of:
	(Dollars in thousands)	2014				2013
	Other assets	$	—			$	—
	Other liabilities	(82,689		)		(6,661		)
	Net asset (liability) recognized	$	(82,689	)		$	(6,661	)
	The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2014 and 2013.
	(Dollars in thousands)	2014				2013
	Net loss (gain)	$	80,806			$	16,605
	Less prior service cost	767				977
	Accumulated other comprehensive loss, excluding income taxes	$	81,573			$	17,582
	The following table provides expected amortization amounts for 2015.
	(Dollars in thousands)
	Actuarial loss	$	11,335
	Prior service cost	210
	Total	$	11,545
	The accumulated benefit obligation for the plan at December 31, 2014 and 2013, equaled $537.0 million and $448.7 million, respectively. The BancShares Plan uses a measurement date of December 31.
	The projected benefit obligation exceeded the fair value of plan assets as of December 31, 2014 and 2013. The fair value of plan assets exceeded the accumulated benefit obligation as of December 31, 2014 and 2013.
	The following table shows the components of periodic benefit cost related to the pension plan and changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2014, 2013 and 2012.
		Year ended December 31
	(Dollars in thousands)	2014				2013				2012
	Service cost	$	12,332			$	16,332			$	14,241
	Interest cost	25,615				23,686				23,711
	Expected return on assets	(31,269		)		(27,733		)		(28,478		)
	Amortization of prior service cost	210				210				210
	Amortization of net actuarial loss	5,148				16,985				11,026
	Total net periodic benefit cost	12,036				29,480				20,710
	Current year actuarial loss (gain)	69,349				(123,557		)		44,315
	Amortization of actuarial loss	(5,148		)		(16,985		)		(11,026		)
	Amortization of prior service cost	(210		)		(210		)		(210		)
	Total recognized in other comprehensive income	63,991				(140,752		)		33,079
	Total recognized in net periodic benefit cost and other comprehensive income	$	76,027			$	(111,272	)		$	53,789
	The assumptions used to determine the benefit obligations as of December 31, 2014 and 2013, are as follows:
	(Dollars in thousands)	2014			2013
	Discount rate	4.27	%		4.9	%
	Rate of compensation increase	4			4
	The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2014, 2013 and 2012, are as follows:
	(Dollars in thousands)	2014			2013			2012
	Discount rate	4.9	%		4	%		4.75	%
	Rate of compensation increase	4			4			4
	Expected long-term return on plan assets	7.5			7.25			7.5
	The estimated discount rate, which represents the interest rate that could be obtained for a suitable investment used to fund the benefit obligations, is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plan are discounted based on this yield curve and a single discount rate is calculated to achieve the same present value.
The estimated long-term rate of return on plan assets is used to calculate the value of plan assets over time. The methodology utilized to establish the estimated long-term rate of return on plan assets considers the actual return on plan assets for various time horizons since 1999 as a predictor of probable future returns. Historical returns are modified as appropriate by estimates of future market conditions that may positively or negatively affect estimated future returns. The return on plan assets for the 15-year, 10-year and 5-year periods ended December 31, 2014 equaled 7.16 percent, 8.24 percent and 10.48 percent, respectively. Based on expectations of modest returns over the next several years, the assumed rate of return for 2014 was 7.50 percent compared to 7.25 percent in 2013.
Bancorporation Plan
The following table provides the changes in benefit obligation and plan assets and the funded status of the plan at December 31, 2014.
(Dollars in thousands)	2014
Change in benefit obligation
Projected benefit obligation at October 1 acquisition date	$	137,452
Service cost	832
Interest cost	1,488
Actuarial (gain) loss	12,802
Benefits paid	(1,242		)
Projected benefit obligation at December 31	151,332
Change in plan assets
Fair value of plan assets at October 1 acquisition date	150,374
Actual return on plan assets	6,486
Employer contributions	—
Benefits paid	(1,242		)
Fair value of plan assets at December 31	155,618
Funded status at December 31	$	4,286
The amounts recognized in the consolidated balance sheets as of December 31, 2014 consist of:
(Dollars in thousands)	2014
Other assets	$	—
Other liabilities	4,286
Net asset (liability) recognized	$	4,286
The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2014.
(Dollars in thousands)	2014
Net loss (gain)	$	9,123
Less prior service cost	—
Accumulated other comprehensive loss, excluding income taxes	$	9,123
There are no expected amortization amounts for 2015. The accumulated benefit obligation for the plan at December 31, 2014 equaled $136.4 million. The Bancorporation Plan uses a measurement date of December 31.
The fair value of plan assets exceeded the projected benefit obligation and accumulated benefit obligation as of December 31, 2014.
The following table shows the components of periodic benefit cost related to the pension plan and changes in plan assets and benefit obligations recognized in other comprehensive income for the year ended December 31, 2014. The table only includes amounts since the acquisition of Bancorporation.
	Year ended December 31
(Dollars in thousands)	2014
Service cost	$	832
Interest cost	1,488
Expected return on assets	(2,807		)
Amortization of prior service cost	—
Amortization of net actuarial loss	—
Total net periodic benefit cost	(487		)
Current year actuarial loss (gain)	9,123
Amortization of actuarial loss	—
Amortization of prior service cost	—
Total recognized in other comprehensive income	9,123
Total recognized in net periodic benefit cost and other comprehensive income	$	8,636
The assumptions used to determine the benefit obligations as of December 31, 2014 are as follows:
(Dollars in thousands)	2014
Discount rate	4.27	%
Rate of compensation increase	4
The assumptions used to determine the net periodic benefit cost for the year ended December 31, 2014 are as follows:
(Dollars in thousands)	2014
Discount rate	4.35	%
Rate of compensation increase	4
Expected long-term return on plan assets	7.5
The estimated discount rate, which represents the interest rate that could be obtained for a suitable investment used to fund the benefit obligations, is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plan are discounted based on this yield curve and a single discount rate is calculated to achieve the same present value.
The weighted average expected long-term rate of return on Bancorporation Plan assets represents the average rate of return expected to be earned on Bancorporation Plan assets over the period the benefits included in the benefit obligation are to be paid. In developing the expected rate of return, the actual historical and current returns on Bancorporation Plan assets are considered.
Plan Assets
BancShares Plan
BancShares' primary total return objective is to achieve returns that, over the long term, will fund retirement liabilities and provide for the desired plan benefits in a manner that satisfies the fiduciary requirements of the Employee Retirement Income Security Act. The plan assets have a long-term time horizon that runs concurrent with the average life expectancy of the participants. As such, the BancShares Plan can assume a time horizon that extends well beyond a full market cycle and can assume a reasonable level of risk. It is expected, however, that both professional investment management and sufficient portfolio diversification will smooth volatility and help to generate a reasonable consistency of return. The investments are broadly diversified among economic sector, industry, quality and size in order to reduce risk and to produce incremental return. Within approved guidelines and restrictions, the investment manager has discretion over the timing and selection of individual investments. Plan assets are currently held by FCB Trust Department.
The fair values of pension plan assets at December 31, 2014 and 2013, by asset class are as follows:
	December 31, 2014
(Dollars in thousands)	Market Value				Quoted prices in				Significant			Significant		Target Allocation		Actual %
					Active Markets				Observable			Nonobservable				of Plan
					for Identical				Inputs			Inputs				Assets
					Assets (Level 1)				(Level 2)			(Level 3)
Cash and equivalents	$	3,854			$	3,854			$	—		$	—	0 - 1%		1	%
Equity securities														55 - 65%		62	%
Large cap	229,315				229,315				—			—
Mid cap	10,796				10,796				—			—
Small cap	44,734				44,734				—			—
International equity (developed)	10,706				10,706				—			—
International equity (emerging)	41,484				41,484				—			—
Fixed income									—			—		25 - 40%		28	%
Investment grade bonds	81,050				—				81,050			—
Intermediate bonds	53,806				—				53,806			—
High-yield corporate bonds	6,592				—				6,592			—
TIPS	2,550				2,550				—			—
International emerging bond	9,930				—				9,930			—
Alternative investments														0 - 10%		9	%
Commodities	17,671				17,671				—			—
Hedge fund composite	32,468				32,468							—
Total pension assets	$	544,956			$	393,578			$	151,378		$	—			100	%
	December 31, 2013
	Market Value				Quoted prices in				Significant			Significant		Target Allocation		Actual %
					Active Markets				Observable			Nonobservable				of Plan
					for Identical				Inputs			Inputs				Assets
					Assets (Level 1)				(Level 2)			(Level 3)
Cash and equivalents	$	2,517			$	2,517			—			—		0 - 1%		1	%
Equity securities														55 - 65%		62	%
Large cap	218,023				218,023				—			—
Mid cap	10,724				10,724				—			—
Small cap	43,928				43,928				—			—
International equity (developed)	10,535				10,535				—			—
International equity (emerging)	40,643				40,643				—			—
Fixed income														25 - 40%		28	%
Investment grade bonds	74,501				—				74,501			—
Intermediate bonds	48,746				—				48,746			—
High-yield corporate bonds	10,111				—				10,111			—
TIPS	4,395				4,395				—			—
International emerging bond	10,119				—				10,119			—
Alternative investments					—				—			—		0 - 10%		9	%
Commodities	19,014				19,014				—			—
Hedge fund composite	30,761				30,761							—
Total pension assets	$	524,017			$	380,540			$	143,477		$	—			100	%
Bancorporation Plan
The investment strategy of the Bancorporation Plan with respect to pension assets is to invest the assets in accordance with the Employee Retirement Security Act and fiduciary standards. The long-term primary objectives for the Plan are to provide for a reasonable amount of long-term growth of capital, without undue exposure to risk, and to provide investment results that meet or exceed the Plan’s expected long-term rate of return.
	December 31, 2014
(Dollars in thousands)	Market Value				Quoted prices in				Significant			Significant		Actual %
					Active Markets				Observable			Nonobservable		of Plan
					for Identical				Inputs			Inputs		Assets
					Assets (Level 1)				(Level 2)			(Level 3)
Equity securities	$	107,333			$	107,333			—			—		68.97	%
Debt securities	35,208				23,528				11,680			—		22.62	%
Cash and equivalents	13,077				13,077				—			—		8.4	%
Total pension assets	$	155,618			$	143,938			$	11,680		$	—
The investment policy for the Bancorporation Plan establishes an asset allocation whereby fixed income securities including cash and cash equivalents should comprise no less than 35% of Bancorporation Plan assets and whereby equity securities should not exceed 60% of Bancorporation Plan assets. Because the investment policy grants a 10% market value variance within the Bancorporation Plan when assessing overall asset allocation percentage, equity securities can comprise up to 70% of Bancorporation Plan assets before action is required.
Cash Flows
Following are estimated payments to pension plan participants in the indicated periods for each plan:
(Dollars in thousands)	BancShares Plan				Bancorporation Plan
2015	$	19,648			$	5,270
2016	21,412				5,594
2017	23,133				6,088
2018	24,767				6,679
2019	26,381				7,045
2020-2024	157,292				42,155
401(k) Savings Plans
BancShares Plans
Certain employees enrolled in the defined benefit plan are also eligible to participate in a 401(k) savings plan through deferral of portions of their salary. For employees who participate in the 401(k) savings plan who also continue to accrue additional years of service under the defined benefit plan, based on the employee’s contribution, BancShares matches up to 75 percent of the employee contribution up to 6 percent of compensation which is vested immediately.
At the end of 2007, current employees were given the option to continue to accrue additional years of service under the defined benefit plan or to elect to join an enhanced 401(k) savings plan. Under the enhanced 401(k) savings plan, based on the employee’s contribution, BancShares matches up to 100 percent of the employees' contributions not to exceed 6 percent of compensation which is vested immediately. In addition to the employer match of the employee contributions, the enhanced 401(k) savings plan provides a guaranteed contribution equal to 3 percent of the compensation of a participant who remains employed at the end of the calendar year. Employees who elected to enroll in the enhanced 401(k) savings plan discontinued the accrual of additional years of service under the defined benefit plan and became enrolled in the enhanced 401(k) savings plan effective January 1, 2008. Eligible employees hired after January 1, 2008, are eligible to participate in the enhanced 401(k) savings plan.
Bancorporation Plans
Legacy Bancorporation had a 401(k) savings plan covering employees who elected to participate prior to September 1, 2007. As of October 1, 2014, BancShares assumed the plan requirement of matching 100 percent of the employees’ contribution of up to 3 percent of compensation and 50 percent of the employees’ contribution over 3 percent but not to exceed 6 percent of compensation. The matching funds contributed by the bank are 100 percent vested immediately.
Legacy Bancorporation also has an enhanced 401(k) savings plan covering employees hired or rehired on or after September 1, 2007 and which provided for benefits beginning January 1, 2008. As of October 1, 2014 acquisition date, BancShares assumed the plan requirement of matching up to 100 percent of the employees’ contributions not to 6 percent of compensation. Historically Bancorporation has contributed a profit sharing contribution equal to 3 percent of a participant’s compensation regardless of whether the participant is making contributions. The matching funds and profit sharing contributions contributed by the bank are 100 percent vested immediately.
Effective January 1, 2015, Bancshares merged the four 401(k) savings plans into two comprehensive plans for all employees. The legacy Bancorporation 401(k) savings plan and enhanced 401(k) savings plan were merged into the existing BancShares 401(k) savings plan and enhanced 401(k) savings plan, respectively. Participation in and terms of the BancShares 401(k) plan and enhanced 401(k) plan did not change as a result of the mergers.
BancShares made participating contributions to both the BancShares and legacy Bancorporation 401(k) plans totaling $16.4 million and $1.1 million for 2014, respectively. Contributions for the BancShares plan of $14.9 million and $14.1 million were made during 2013 and 2012, respectively.
Additional Benefits for Executives and Directors and Officers of Acquired Entities
FCB and FCB-SC have entered into contractual agreements with certain executives that provide payments for a period of ten years following separation from service at an agreed-upon age. These agreements also provide a death benefit in the event a participant dies before the term of the agreement ends. FCB has also assumed liability for contractual obligations to directors and officers of previously-acquired entities.
The following table provides the accrued liability as of December 31, 2014 and 2013, and the changes in the accrued liability during the years then ended:
(Dollars in thousands)	2014				2013
Present value of accrued liability as of January 1	$	23,960			$	25,851
Benefits acquired in the 1st Financial merger	1,455				—
Benefits acquired in the Bancorporation merger	10,288				—
Benefit expense and interest cost	2,682				1,151
Benefits paid	(2,431		)		(3,042		)
Benefits forfeited	—				—
Present value of accrued liability as of December 31	$	35,954			$	23,960
Discount rate at December 31	4.27		%		4.9		%

Other_Noninterest_Income_and_O

Other Noninterest Income and Other Noninterest Expense	12 Months Ended
	Dec. 31, 2014
Noninterest Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	OTHER NONINTEREST INCOME AND OTHER NONINTEREST EXPENSE
	Recoveries on PCI loans that have been previously charged-off are additional sources of noninterest income. BancShares records these recoveries as noninterest income rather than as an adjustment to the allowance for loan and lease losses since charge-offs on PCI loans are primarily recorded through the nonaccretable difference. These recoveries totaled $16.2 million, $29.7 million and $10.5 million for years ended December 31, 2014, 2013 and 2012, respectively.
	Other noninterest expense for the years ended December 31, 2014, 2013 and 2012, included the following:
	(dollars in thousands)	2014		2013		2012
	Cardholder processing	$	11,950	$	9,892	$	11,816
	Merchant processing	39,874		35,279		33,313
	Collection	11,595		21,209		25,591
	Processing fees paid to third parties	17,089		15,095		14,454
	Cardholder reward programs	11,435		10,154		4,325
	Telecommunications	10,834		10,033		11,131
	Consultant	10,168		9,740		3,914
	Advertising	11,461		8,286		3,897
	Other	83,436		73,326		70,874
	Total other noninterest expense	$	207,842	$	193,014	$	179,315

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	At December 31, income tax expense consisted of the following:
	(Dollars in thousands)	2014			2013			2012
	Current tax expense
	Federal	$	84,430		$	46,848		$	89,939
	State	13,941			7,080			9,212
	Total current tax expense	98,371			53,928			99,151
	Deferred tax (benefit) expense
	Federal	(30,658		)	38,731			(26,501		)
	State	(2,681		)	8,915			(7,921		)
	Total deferred tax (benefit) expense	(33,339		)	47,646			(34,422		)
	Total income tax expense	$	65,032		$	101,574		$	64,729
	Income tax expense differed from the amounts computed by applying the federal income tax rate of 35 percent to pretax income as a result of the following:
	(Dollars in thousands)	2014			2013			2012
	Income taxes at statutory rates	$	71,258		$	93,956		$	68,993
	Increase (reduction) in income taxes resulting from:
	Nontaxable income on loans, leases and investments, net of nondeductible expenses	(1,832		)	(1,185		)	(1,309		)
	State and local income taxes, including change in valuation allowance, net of federal income tax benefit	7,319			10,397			839
	Acquisition stock settlement	(10,185		)	—			—
	Tax credits net of amortization	(2,896		)	(960		)	(2,372		)
	Other, net	1,368			(634		)	(1,422		)
	Total income tax expense	$	65,032		$	101,574		$	64,729
	The net deferred tax asset included the following components at December 31:
	(Dollars in thousands)	2014			2013
	Allowance for loan and lease losses	$	79,537		$	90,790
	Pension liability	15,391			2,593
	Executive separation from service agreements	23,849			9,321
	State operating loss carryforward	29			36
	Unrealized loss on cash flow hedge	1,673			2,786
	Net unrealized loss on securities included in accumulated other comprehensive loss	—			6,541
	Accelerated depreciation	5,550			—
	FDIC assisted transactions timing differences	71,219			42,016
	Other reserves	15,326			6,958
	Other	25,746			10,569
	Deferred tax asset	238,320			171,610
	Accelerated depreciation	—			4,382
	Lease financing activities	10,762			10,216
	Net unrealized gain on securities included in accumulated other comprehensive loss	3,245			—
	Net deferred loan fees and costs	4,772			4,302
	Intangible assets	7,729			17,558
	Security, loan and debt valuations	34,289			—
	Other	11,395			4,564
	Deferred tax liability	72,192			41,022
	Net deferred tax asset	$	166,128		$	130,588
	Amounts for 2013 and 2012 periods have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects. Under this standard, amortization of investments in qualified affordable housing projects is reported within income tax expense.
	On October 1, 2014, Bancorporation merged with and into BancShares in a statutory merger treated as a "reorganization" within the meaning of section 368(a) of the Internal Revenue Code of 1986 as amended. Income tax expense has been adjusted for the settlement of the ownership of Bancorporation stock at the date of the merger. Income tax expense has also been adjusted for the revaluation of the acquired deferred inventory to reflect the rates that will apply under currently enacted tax law when the temporary differences are expected to reverse.
	No valuation allowance was necessary as of December 31, 2014 to reduce BancShares’ gross state deferred tax asset to the amount that is more likely than not to be realized.
	Under GAAP, the benefit of a position taken or expected to be taken in a tax return should be recognized when it is more likely than not that the position will be sustained based on its technical merit. The liability for unrecognized tax benefits was not material at December 31, 2014 and 2013, and changes in the liability were not significant during 2014, 2013 and 2012. BancShares does not expect the liability for unrecognized tax benefits to change significantly during 2015. BancShares recognizes interest and penalties, if any, related to income tax matters in income tax expense, and the amounts recognized during 2014, 2013 and 2012 were not material.
	During the third quarter of 2013, BancShares adjusted its net deferred tax asset as a result of reductions in the North Carolina corporate income tax rate that were enacted July 23, 2013. The lower corporate income tax rate resulted in a reduction in the deferred tax asset and an increase in income tax expense in 2013.
	BancShares, its subsidiaries', and Bancorporation's federal income tax returns are currently under examination for 2010 and 2012, and in California for 2009 and 2010. Generally, the state jurisdictions in which BancShares files income tax returns are subject to examination for a period up to four years after returns are filed.

Transactions_with_Related_Pers

Transactions with Related Persons	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Transactions with related persons	TRANSACTIONS WITH RELATED PERSONS
	BancShares had, and expects to have in the future, banking transactions in the ordinary course of business with directors, officers and their associates (Related Persons) and entities that are controlled by Related Persons.
	In connection with the Bancorporation merger, BancShares completed an analysis of the control ownership of BancShares and Bancorporation and determined that common control did not exist.
	For those identified as Related Persons as of December 31, 2014, the following table provides an analysis of changes in the loans outstanding during 2014:
	(dollars in thousands)
	Balance at January 1, 2014	$	1,825
	New loans	39
	Repayments	(819		)
	Balance at December 31, 2014	$	1,045
	Unfunded loan commitments available to Related Persons totaled $1.3 million and $5.5 million as of December 31, 2014 and 2013, respectively.
	During 2014, 2013 and 2012, fees from processing services included $17.2 million, $21.6 million and $33.7 million, respectively, for services rendered to entities controlled by Related Persons. The 2014 amount includes $16.8 million earned from Bancorporation prior to the merger as it was considered an entity controlled by Related Persons. Effective with the merger there are no longer any fees earned from Bancorporation. The amounts recorded from the largest individual institution totaled $16.8 million, $20.4 million and $22.8 million for 2014, 2013 and 2012, respectively. Also, prior to 2013, BancShares provided various processing and operational services to other financial institutions, some of which are controlled by Related Persons. During the first quarter of 2013, BancShares sold its rights and most of its obligations under various service agreements with client banks, including two banks that are controlled by Related Persons.
	In the third quarter of 2014, BancShares purchased $25.0 million of FCB/SC Capital Trust II's outstanding Trust Preferred Securities from an unaffiliated third party. BancShares paid approximately $23.0 million, plus unpaid accrued distributions on the securities for the current distribution period, for the Trust Preferred Securities.
	Investment securities available for sale include an investment in Bancorporation at December 31, 2013 with a carrying value of $21.6 million and cost of $452,000. Due to the merger with Bancorporation in the fourth quarter of 2014 these shares were canceled and ceased to exist at October 1, 2014.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
Summary of Derivative Instruments [Abstract]
Derivatives	DERIVATIVES
	At December 31, 2014, BancShares had an interest rate swap that qualifies as a cash flow hedge under GAAP. For all periods presented, the fair value of the outstanding derivative is included in other liabilities in the consolidated balance sheets, and the net change in fair value is included in the consolidated statements of cash flows under the caption net change in other liabilities.
	The following table provides the notional amount of the interest rate swap and the fair value of the liability as of December 31, 2014 and 2013.
		December 31, 2014				December 31, 2013
	(Dollars in thousands)	Notional		Estimated fair value of liability		Notional		Estimated fair value of liability
		amount				amount
	2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016	$	93,500	$	4,337	$	93,500	$	7,220
	The interest rate swap is used for interest rate risk management purposes and converts variable-rate exposure on outstanding debt to a fixed rate. The interest rate swap has a notional amount of $93.5 million, representing the amount of variable rate trust preferred capital securities issued during 2006 and still outstanding at the swap inception date. The interest rate swap hedges interest payments through June 2016 and requires fixed-rate payments by BancShares at 5.50 percent in exchange for variable-rate payments of 175 basis points above the three-month LIBOR, which is equal to the interest paid to the holders of the trust preferred capital securities. Settlement of the swap occurs quarterly. At December 31, 2014 and 2013, collateral with a fair value of $7.0 million was pledged to secure the existing obligation under the interest rate swap.
	For cash flow hedges, the effective portion of the gain or loss due to changes in the fair value of the derivative hedging instrument is included in other comprehensive income (loss), while the ineffective portion, representing the excess of the cumulative change in the fair value of the derivative over the cumulative change in expected future discounted cash flows on the hedged transaction, is recorded in the consolidated income statement. BancShares’ interest rate swap has been fully effective since inception. Therefore, changes in the fair value of the interest rate swap have had no impact on net income. For the years ended December 31, 2014, 2013 and 2012, BancShares recognized interest expense of $3.3 million, $3.3 million and $3.1 million, respectively, resulting from incremental interest paid to the interest rate swap counterparty, none of which related to ineffectiveness.
	The estimated net amount in accumulated other comprehensive loss at December 31, 2014 that is expected to be reclassified into earnings within the next 12 months is a net after-tax loss of $2.2 million.
	BancShares monitors the credit risk of the interest rate swap counterparty.

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
	Goodwill
	Goodwill totaled $139.8 million and $102.6 million at December 31, 2014 and 2013, with no impairment recorded during 2014, 2013 and 2012. The following table presents the changes in the carrying amount of goodwill.
	(Dollars in thousands)	2014			2013
	Balance at January 1	$	102,625		$	102,625
	Acquired in the 1st Financial merger	32,915			—
	Acquired in the Bancorporation merger	4,233			—
	Balance at December 31	$	139,773		$	102,625
	GAAP requires that goodwill be tested each year to determine if goodwill is impaired. The goodwill impairment test requires a two-step method to evaluate and calculate impairment. The first step requires estimation of the reporting unit’s fair value. If the fair value exceeds the carrying value, no further testing is required. If the carrying value exceeds the fair value, a second step is performed to determine whether an impairment charge must be recorded and, if so, the amount of such charge.
	BancShares performs annual impairment tests as of July 31 each year. After the first step for 2014 and 2013, no further analysis was required as there was no indication of impairment.
	Mortgage Servicing Rights
	The activity of the servicing asset for 2014 and 2013 is presented in the following table:
	(Dollars in thousands)	2014			2013
	Balance at January 1	$	16		$	1,784
	Servicing rights originated	727			—
	Amortization	(919		)	(205		)
	Servicing rights acquired in the 1st Financial merger	148			—
	Servicing rights acquired in the Bancorporation merger	17,566			—
	Servicing assets sold	—			(1,563		)
	Valuation allowance	$	(850	)	$	—
	Balance at December 31	$	16,688		$	16
	During 2014, BancShares acquired the rights to service mortgage loans that had previously been sold by Bancorporation and also recorded a mortgage servicing asset from the 1st Financial merger. The acquired assets were recorded at fair value and amortized over the remaining estimated servicing lives, which were estimated to be 5.5 years and 3 months for the Bancorporation and 1st Financial mergers, respectively, as of the acquisition date. During 2013, BancShares sold substantially all of its servicing asset acquired for the rights to service mortgage loans that had previously been sold by United Western. BancShares does not hedge its mortgage servicing asset.
	As of December 31, 2014 and 2013, the fair market values of mortgage servicing rights were $16.7 million and $16.0 thousand, respectively. Contractually specified mortgage servicing fees, late fees, and ancillary fees earned for the years ended December 31, 2014, 2013 and 2012 were $1.3 million, $0.3 million, and $0.6 million respectively. These amounts are included in mortgage income in the Consolidated Statements of Income.
	The amortization expense related to mortgage servicing rights, included as a reduction of mortgage income in the Consolidated Statements of Income, was $0.9 million, $0.2 million, and $2.6 million for the years ended December 31, 2014, 2013 and 2012, respectively. Amortization expense included impairment of $0.9 million and $0.3 million for the years ended 2014 and 2012, respectively. There was no impairment recorded for the year ended 2013.
	Valuation of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and evaluated on a discounted earnings basis to determine the present value of future earnings. Key economic assumptions used to value mortgage servicing rights as of December 31, 2014:
		2014
	Discount rate - conventional fixed loans	7.2		%
	Discount rate - all loans excluding conventional fixed loans	9.2		%
	Weighted average constant prepayment rate	14.25		%
	Weighted average cost to service loans	$	56.02
	Other Intangible Assets
	The following information relates to other intangible assets, all customer-related, which are being amortized over their estimated useful lives:
	(dollars in thousands)	2014			2013
	Balance at January 1	$	1,247		$	3,556
	Acquired in the 1st Financial merger	3,780			—
	Acquired in the Bancorporation merger	91,850			—
	Amortization	(6,955		)	(2,309		)
	Balance at December 31	$	89,922		$	1,247
	Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2014. BancShares recorded $88.0 million and $3.8 million in core deposit intangibles related to the Bancorporation and 1st Financial mergers, respectively. Intangible assets generated by acquisitions, which represent the estimated fair value of core deposits and other customer relationships that were acquired, are being amortized on an accelerated basis over their estimated useful lives. The estimated useful remaining lives range from less than 1 year to no more than 10 years.
	The gross amount of other intangible assets and accumulated amortization as of December 31, 2014 and 2013, are:
	(dollars in thousands)	2014			2013
	Gross balance	$	114,596		$	18,966
	Accumulated amortization	(24,674		)	(17,719		)
	Carrying value	$	89,922		$	1,247
	Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be:
	(dollars in thousands)
	2015	$	18,576
	2016	16,200
	2017	13,951
	2018	11,701
	2019	9,457

Shareholders_Equity_Dividends_

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Shareholders' Equity, Dividend Restrictions and Other Regulatory Matters	SHAREHOLDERS' EQUITY, DIVIDEND RESTRICTIONS AND OTHER REGULATORY MATTERS
	Various regulatory agencies have established guidelines that evaluate capital adequacy based on risk-weighted adjusted assets. An additional capital computation evaluates tangible capital based on tangible assets. Minimum capital requirements currently set forth by the regulatory agencies require a tier 1 capital ratio of no less than 4 percent of risk-weighted assets, a total capital ratio of no less than 8 percent of risk-weighted assets and a leverage capital ratio of no less than 3 percent of tangible assets. To meet the FDIC’s well-capitalized standards, the tier 1 and total capital ratios must be at least 6 percent and 10 percent, respectively, while the leverage ratio must equal 5 percent. Failure to meet minimum capital requirements may result in certain actions by regulators that could have a direct material effect on the consolidated financial statements.
	Based on the most recent notifications from its regulators, FCB and FCB-SC are well-capitalized under the regulatory framework for prompt corrective action. Management believes that as of December 31, 2014, BancShares, FCB, and FCB-SC met all capital adequacy requirements to which they are subject and was not aware of any conditions or events that would affect each entity's well-capitalized status.
	Following is an analysis of capital ratios for BancShares, FCB, and FCB-SC as of December 31, 2014 and 2013:
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Amount		Ratio		Requirements to be well-capitalized		Amount		Ratio		Requirements to be well-capitalized
	BancShares
	Tier 1 capital (1)	$	2,690,324	13.61	%	6	%	$	2,103,926	14.89	%	6	%
	Total capital (1)	2,904,123		14.69	%	10	%	2,315,579		16.39	%	10	%
	Leverage capital (1)	2,690,324		8.91	%	5	%	2,103,926		9.8	%	5	%
	FCB
	Tier 1 capital (1)	2,019,595		13.12	%	6	%	1,978,136		14.1	%	6	%
	Total capital (1)	2,212,163		14.37	%	10	%	2,179,248		15.54	%	10	%
	Leverage capital (1)	2,019,595		9.3	%	5	%	1,978,136		9.34	%	5	%
	FCB-SC
	Tier 1 capital	653,515		15.11	%	6	%	734,218		17.09	%	6	%
	Total capital	657,475		15.2	%	10	%	787,962		18.34	%	10	%
	Leverage capital	653,515		7.89	%	5	%	734,218		9.12	%	5	%
	(1) Amounts for 2013 have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects.
	As of December 31, 2014, BancShares had $128.5 million of trust preferred capital securities included in tier 1 capital. Beginning January 1, 2015, 75 percent of BancShares' trust preferred capital securities will be excluded from tier 1 capital, with the remaining 25 percent phased out January 1, 2016.
	At December 31, 2014, tier 2 capital of BancShares included $9.0 million of qualifying subordinated debt acquired in the Bancorporation merger with a scheduled maturity date of June 1, 2018. At December 31, 2013, tier 2 capital of BancShares included $25.0 million of qualifying subordinated debt with a scheduled maturity date of June 1, 2015. Under current regulatory guidelines, when subordinated debt is within five years of its scheduled maturity date, issuers must discount the amount included in tier 2 capital by 20 percent for each year until the debt matures. The qualifying subordinated debt with a scheduled maturity date of June 1, 2015 was completely removed from tier 2 capital during the second quarter of 2014, one year prior to the scheduled maturity of the subordinated debt.
	In July 2013, Bank regulatory agencies approved new global regulatory capital guidelines (Basel III) aimed at strengthening existing capital requirements for bank holding companies through a combination of higher minimum capital requirements, new capital conservation buffers and more conservative definitions of capital and balance sheet exposure. When fully implemented in January 2019, the rule includes a minimum ratio of common equity tier 1 capital to risk-weighted assets of 4.5 percent and a common equity tier 1 capital conservation buffer of 2.5 percent of risk-weighted assets, totaling 7 percent. The rule also raises the minimum ratio of tier 1 capital to risk-weighted assets from 4 percent to 6 percent and includes a minimum leverage ratio of 4 percent.
	Additionally, trust preferred securities and cumulative preferred securities are required to be phased out of tier 1 capital by 2016. The inclusion of accumulated other comprehensive income in tier 1 common equity, as described in the proposed rules, is only applicable for institutions larger than $50 billion in assets. Management continues to monitor
	developments and remains committed to managing capital levels in a prudent manner.
	BancShares has two classes of common stock—Class A common and Class B common. Shares of Class A common have one vote per share, while shares of Class B common have 16 votes per share.
	During the second quarter of 2013, BancShares' board granted authority to purchase up to 100,000 and 25,000 shares of Class A and Class B common stock, respectively, beginning on July 1, 2013, and continuing through June 30, 2014. As of December 31, 2014, no purchases had occurred pursuant to that authorization. This authorization terminated on June 30, 2014 and was not extended.
	The Board of Directors of FCB may declare a dividend on a portion of its undivided profits as it deems appropriate, subject to the requirements of the FDIC and the General Statutes of North Carolina, without prior regulatory approval. As of December 31, 2014, the amount was $1.48 billion. However, to preserve its well-capitalized status, the maximum amount of the dividend was limited to $672.4 million. Dividends declared by FCB amounted to $30.0 million in 2014, $131.0 million in 2013 and $179.6 million in 2012. Dividends declared by FCB-SC amounted to $52.4 million in 2014.
	BancShares, FCB, and FCB-SC are subject to various requirements imposed by state and federal banking statutes and regulations, including regulations requiring the maintenance of noninterest-bearing reserve balances at the Federal Reserve Bank. Banks are allowed to reduce the required balances by the amount of vault cash. For 2014, the requirements averaged $382.7 million.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	To meet the financing needs of its customers, BancShares and its subsidiaries have financial instruments with off-balance sheet risk. These financial instruments include commitments to extend credit, standby letters of credit and recourse obligations on mortgage loans sold. These instruments involve elements of credit, interest rate or liquidity risk.
	Commitments to extend credit are legally binding agreements to lend to customers. Commitments generally have fixed expiration dates or other termination clauses and may require payment of fees. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future liquidity requirements. Established credit standards control the credit risk exposure associated with these commitments. In some cases, BancShares requires that collateral be pledged to secure the commitment, including cash deposits, securities and other assets. At December 31, 2014, BancShares had unused commitments totaling $7.19 billion, compared to $5.84 billion at December 31, 2013. Total unfunded commitments relating to investments in affordable housing projects totaled $16.8 million and $19.8 million at December 31, 2014 and December 31, 2013, respectively, and are included in other liabilities on BancShares' Consolidated Balance Sheet.
	Standby letters of credit are commitments guaranteeing performance of a customer to a third party. Those guarantees are issued primarily to support public and private borrowing arrangements. To minimize its exposure, BancShares’ credit policies govern the issuance of standby letters of credit. At December 31, 2014 and 2013, BancShares had standby letters of credit amounting to $77.4 million and $54.8 million, respectively. The credit risk related to the issuance of these letters of credit is essentially the same as that involved in extending loans to clients and, therefore, these letters of credit are collateralized when necessary.
	Pursuant to standard representations and warranties relating to residential mortgage loan sales, contingent obligations exist for various events that may occur following the loan sale. If underwriting or documentation deficiencies are discovered at any point in the life of the loan or if the loan becomes nonperforming within 120 days of its sale, the investor may require BancShares to repurchase the loan or to repay a portion of the sale proceeds. Other liabilities included reserves of $3.2 million and $3.6 million as of December 31, 2014 and 2013, respectively, for estimated losses arising from these standard representation and warranty provisions.
	BancShares has recorded a receivable from the FDIC totaling $28.7 million and $93.4 million as of December 31, 2014 and 2013, respectively, for the expected reimbursement of losses on assets covered under the various loss share agreements. These loss share agreements impose certain obligations on us that, in the event of noncompliance, could result in the delay or disallowance of some or all of our rights under those agreements. Requests for reimbursement are subject to FDIC review and may be delayed or disallowed for noncompliance. The loss share agreements are subject to interpretation by both the FDIC and BancShares, and disagreements may arise regarding coverage of losses, expenses and contingencies.
	The loss share agreements for five FDIC-assisted transactions include provisions related to contingent payments that may be owed to the FDIC at the termination of the agreements (clawback liability).The clawback liability represents an estimated payment by BancShares to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The clawback liability is estimated by discounting estimated future payments and is recorded in the Consolidated Balance Sheets as a payable to the FDIC for loss share agreements. As of December 31, 2014 and 2013, the clawback liability was $116.5 million and $109.4 million, respectively.
	BancShares and various subsidiaries have been named as defendants in legal actions arising from their normal business activities in which damages in various amounts are claimed. BancShares is also exposed to litigation risk relating to the prior business activities of banks from which assets were acquired and liabilities assumed in the various merger transactions. Although the amount of any ultimate liability with respect to such matters cannot be determined, in the opinion of management, any such liability will not have a material effect on BancShares’ consolidated financial statements.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Accumulated other comprehensive income (loss) included the following as of December 31, 2014, and December 31, 2013:
		December 31, 2014										December 31, 2013
	(Dollars in thousands)	Accumulated				Deferred			Accumulated			Accumulated			Deferred			Accumulated
		other				tax			other			other			tax			other
		comprehensive				benefit			comprehensive			comprehensive			expense			comprehensive
		income (loss)							income (loss),			loss			(benefit)			loss,
									net of tax									net of tax
	Unrealized gains (losses) on investment securities available for sale	$	8,343			$	3,245		$	5,098		$	(16,632	)	$	(6,541	)	$	(10,091	)
	Unrealized loss on cash flow hedge	(4,337		)		(1,673		)	(2,664		)	(7,220		)	(2,786		)	(4,434		)
	Funded status of defined benefit plan	(90,696		)		(35,281		)	(55,415		)	(17,582		)	(6,839		)	(10,743		)
	Total	$	(86,690	)		$	(33,709	)	$	(52,981	)	$	(41,434	)	$	(16,166	)	$	(25,268	)
	The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2014, and December 31, 2013:
	(Dollars in thousands)	Unrealized gains and losses on available-for-sale securities(1)				Gains and losses on cash flow hedges(1)			Defined benefit pension items(1)			Total
	Balance at January 1, 2013	$	20,517			$	(6,292	)	$	(96,331	)	$	(82,106	)
	Other comprehensive income (loss) before reclassifications	(30,608		)		1,858			75,082			46,332
	Amounts reclassified from accumulated other comprehensive income (loss)	—				—			10,506			10,506
	Net current period other comprehensive income (loss)	(30,608		)		1,858			85,588			56,838
	Balance at December 31, 2013	(10,091		)		(4,434		)	(10,743		)	(25,268		)
	Other comprehensive income (loss) before reclassifications	(2,683		)		1,770			(47,946		)	(48,859		)
	Amounts reclassified from accumulated other comprehensive loss	17,872				—			3,274			21,146
	Net current period other comprehensive income (loss)	15,189				1,770			(44,672		)	(27,713		)
	Balance at December 31, 2014	$	5,098			$	(2,664	)	$	(55,415	)	$	(52,981	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
	The following table presents the amounts reclassified from accumulated other comprehensive (loss) income and the line item affected in the statement where net income is presented for the twelve months ended December 31, 2014 and December 31, 2013:
	(Dollars in thousands)		Year ended December 31, 2014
	Details about accumulated other comprehensive loss		Amount reclassified from accumulated other comprehensive income (loss)(1)				Affected line item in the statement where net income is presented
	Unrealized gains and losses on available for sale securities
			$	(29,096	)		Securities gains
			11,224				Income taxes
			$	(17,872	)		Net income
	Amortization of defined benefit pension items
	Prior service costs		$	(210	)		Employee benefits
	Actuarial losses		(5,148		)		Employee benefits
			(5,358		)		Income before income taxes
			2,084				Income taxes
			$	(3,274	)		Net income
	Total reclassifications for the period		$	(21,146	)
			Year ended December 31, 2013
	Details about accumulated other comprehensive loss		Amount reclassified from accumulated other comprehensive income (loss)(1)				Affected line item in the statement where net income is presented
	Amortization of defined benefit pension items
	Prior service costs		$	(210	)		Employee benefits
	Actuarial losses		(16,985		)		Employee benefits
			(17,195		)		Income before income taxes
			6,689				Income taxes
			$	(10,506	)		Net income
	Total reclassifications for the period		$	(10,506	)
	(1) Amounts in parentheses indicate debits to profit/loss.

Parent_Company_Financial_State

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Statements	PARENT COMPANY FINANCIAL STATEMENTS
	Parent Company
	Condensed Balance Sheets
	(Dollars in thousands)	December 31, 2014			December 31, 2013
	Assets
	Cash	$	24,026		$	13,047
	Investment securities available for sale	110,644			234,488
	Investment in subsidiaries (1)	2,815,866			2,053,292
	Due from subsidiaries	295,994			145,666
	Other assets	74,157			144,998
	Total assets	$	3,320,687		$	2,591,491
	Liabilities and Shareholders' Equity
	Short-term borrowings	$	485,207		$	411,907
	Long-term obligations	136,717			96,392
	Other liabilities	11,169			11,730
	Shareholders' equity (1)	2,687,594			2,071,462
	Total liabilities and shareholders' equity (1)	$	3,320,687		$	2,591,491
	(1) Amounts for 2013 have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects.
	Parent Company
	Condensed Income Statements
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	Interest income	$	1,784		$	1,387		$	1,353
	Interest expense	9,694			7,065			15,435
	Net interest loss	(7,910		)	(5,678		)	(14,082		)
	Dividends from subsidiaries	82,419			131,006			179,588
	Other income	33,600			3,620			2,843
	Other operating expense	6,534			2,344			6,384
	Income before income tax benefit and equity in undistributed net income of subsidiaries	101,575			126,604			161,965
	Income tax benefit	(2,590		)	(2,095		)	(8,417		)
	Income before equity in undistributed net income of subsidiaries	104,165			128,699			170,382
	Equity (excess distributions) in undistributed net income of subsidiaries (1)	34,397			38,170			(37,987		)
	Net income (1)	$	138,562		$	166,869		$	132,395
	(1) Amounts for 2013 and 2012 periods have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects.
	Parent Company
	Condensed Statements of Cash Flows
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	OPERATING ACTIVITIES
	Net income (1)	$	138,562		$	166,869		$	132,395
	Adjustments
	Excess distributions (undistributed) net income of subsidiaries (1)	(34,397		)	(38,170		)	37,987
	Net amortization of premiums and discounts	594			334			439
	Securities gains	(29,126		)	—			(2,274		)
	Gain on elimination of acquired debt	(1,988		)	—			—
	Gain on sale of other assets	—			(1,331		)	—
	Other than temporary impairment on securities	—			—			45
	Change in other assets	93,385			(61,704		)	30,761
	Change in other liabilities	2,250			(2,096		)	(10,148		)
	Net cash provided by operating activities	169,280			63,902			189,205
	INVESTING ACTIVITIES
	Net change in due from subsidiaries	(150,328		)	(67,154		)	42,323
	Purchases of investment securities	(33,243		)	(126,197		)	(111,409		)
	Proceeds from sales, calls, and maturities of securities	114,208			135,000			112,625
	Investment in subsidiaries	1,579			1,489			9,298
	Business acquisitions, net of cash acquired	(24,772		)	—			—
	Net cash (used) provided by investing activities	(92,556		)	(56,862		)	52,837
	FINANCING ACTIVITIES
	Net change in short-term borrowings	(1,211		)	12,860			23,651
	Retirement of long-term obligations	(52,372		)	—			(155,305		)
	Stock issuance costs	(619		)	—			—
	Repurchase of common stock	—			(321		)	(103,624		)
	Cash dividends paid	(11,543		)	(8,663		)	(15,398		)
	Net cash provided (used) by financing activities	(65,745		)	3,876			(250,676		)
Net change in cash	10,979			10,916			(8,634		)
Cash balance at beginning of year	13,047			2,131			10,765
Cash balance at end of year	$	24,026		$	13,047		$	2,131
CASH PAYMENTS FOR:
Interest	$	5,079		$	6,904		$	25,574
Income taxes	127,970			102,890			66,453
(1) Amounts for 2013 and 2012 periods have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects.

Subsequent_Events_Notes

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS
	The merger of BancShares' South Carolina bank subsidiary, FCB-SC, into and with FCB became effective January 1, 2015. FCB is the surviving bank in the merger. FCB-SC is the former bank subsidiary of First Citizens Bancorporation, Inc. and became a separate bank subsidiary of BancShares when Bancorporation was merged into BancShares effective on October 1, 2014. See Note B for additional information regarding the Bancorporation merger.
	On February 13, 2015, FCB announced that it entered into an agreement with the FDIC to purchase certain assets and assume certain liabilities of Capitol City Bank & Trust Company ("Capitol City") of Atlanta, Georgia. The Georgia Department of Banking and Finance closed Capitol City on February 13, 2015 and appointed the FDIC as receiver. On February 14, 2015, Capitol City branches began operating as Capitol City Bank & Trust, a division of FCB. Under the terms of the agreement, First Citizens Bank has the option to purchase any owned bank premises or to assume the leases on any or all of the banking offices. Due to the close proximity of the acquisition date and the date that BancShares' financial statements were issued, preliminary fair value estimates are not available.

Accounting_Policies_and_Basis_1

Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
General/Nature of Operations	General
	First Citizens BancShares, Inc. ("BancShares") is a financial holding company organized under the laws of Delaware and conducts operations through its banking subsidiary, First-Citizens Bank & Trust Company ("FCB"), which is headquartered in Raleigh, North Carolina. For the period October 1, 2014 through December 31, 2014, Bancshares maintained two banking subsidiaries. On January 1, 2015, First Citizens Bank and Trust Company, Inc. ("FCB-SC") merged with and into FCB. As of January 1, 2015, FCB remains as the single banking subsidiary of BancShares.
	On January 1, 2014, FCB completed the merger of 1st Financial Services Corporation ("1st Financial"). The 1st Financial merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities, and identifiable intangible assets were recorded at their acquisition date estimated fair values. See Note B for additional information regarding the 1st Financial merger.
	On October 1, 2014, BancShares completed the merger of First Citizens Bancorporation, Inc. ("Bancorporation") with and into BancShares pursuant to an Agreement and Plan of Merger dated June 10, 2014, as amended on July 29, 2014. FCB-SC merged with and into FCB on January 1, 2015. Under the terms of the Merger Agreement, each share of Bancorporation common stock was converted into the right to receive 4.00 shares of BancShares' Class A common stock and $50.00 cash, unless the holder elected for each share to be converted into the right to receive 3.58 shares of BancShares' Class A common stock and 0.42 shares of BancShares' Class B common stock. The Bancorporation merger was accounted for under the acquisition method of accounting. The purchased assets, assumed liabilities and identifiable intangible assets were recorded at their acquisition date estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the transaction as additional information regarding closing date fair values becomes available. See Note B for additional information regarding the Bancorporation merger.
	The accounting and reporting policies of BancShares and its subsidiaries are in accordance with accounting principles generally accepted in the United States of America ("GAAP"). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. The following is a summary of BancShares' more significant accounting policies.
	Nature of Operations
	FCB and FCB-SC operate 572 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Washington, DC, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma and Kansas. FCB and FCB-SC provide full-service banking services designed to meet the needs of retail and commercial customers in the markets in which they operate. The services provided include transaction and savings deposit accounts, commercial and consumer loans, trust and asset management. Investment services, including sales of annuities and third party mutual funds are offered through First Citizens Investor Services, Inc. and First Citizens Securities Corporation, and title insurance is offered through Neuse Financial Services, Inc.
Principles of Consolidation and Segment Reporting	Principles of Consolidation and Segment Reporting
	The consolidated financial statements of BancShares include the accounts of BancShares and those subsidiaries that are majority owned by BancShares and over which BancShares exercises control. In consolidation, all significant intercompany accounts and transactions are eliminated. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly-owned and majority-owned subsidiaries are consolidated unless GAAP requires otherwise. BancShares operates with centralized management and combined reporting, thus BancShares operates as one consolidated reportable segment.
	FCB and FCB-SC have investments in certain partnerships and limited liability entities primarily for the purposes of fulfilling Community Reinvestment Act requirements and/or obtaining tax credits. The entities have been evaluated and determined to be variable interest entities ("VIEs"). VIEs are legal entities in which equity investors do not have sufficient equity at risk for the entity to independently finance its activities, or as a group, the holders of the equity investment at risk lack the power through voting or similar rights to direct the activities of the entity that most significantly impact its economic performance, or do not have the obligation to absorb the expected losses of the entity or the right to receive expected residual returns of the entity. Consolidation of a VIE is considered appropriate if a reporting entity holds a controlling financial interest in the VIE. Analysis of these investments concluded that FCB and FCB-SC are not the primary beneficiary and do not hold a controlling interest in the VIEs and, therefore, the assets and liabilities of these entities are not consolidated into the financial statements of FCB, FCB-SC or BancShares. The recorded investment in these entities is reported within other assets in BancShares' Consolidated Balance Sheets.
Reclassifications	Reclassifications
	Prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects which was adopted as of January 1, 2012 and did not have a material impact on our consolidated financial condition or results of operations.
	In certain instances other than the retrospective adoption of ASU 2014-01, amounts reported in prior years' consolidated financial statements have been reclassified to conform to the current financial statement presentation. Such reclassifications had no effect on previously reported cash flows, shareholders' equity or net income.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates, and different assumptions in the application of these policies could result in material changes in BancShares' consolidated financial position, the consolidated results of its operations or related disclosures. Material estimates that are particularly susceptible to significant change include:
	•	Allowance for loan and lease losses
	•	Fair value of financial instruments, including acquired assets and assumed liabilities
	•	Pension plan assumptions
	•	Cash flow estimates on purchased credit-impaired ("PCI") loans
	•	Receivable from and payable to the FDIC for loss share agreements
	•	Income tax assets, liabilities and expense
Business Combinations	Business Combinations
	BancShares accounts for all business combinations using the acquisition method of accounting as required by Accounting Standards Codification ("ASC") 805, Business Combinations. Under this method of accounting, acquired assets and assumed liabilities are included with the acquirer's accounts as of the date of acquisition, with any excess of purchase price over the fair value of the net assets acquired recognized as either finite lived intangibles or capitalized as goodwill. In addition, acquisition-related costs and restructuring costs are recognized as period expenses as incurred.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, interest-bearing deposits with banks and federal funds sold. Cash and cash equivalents have maturities of three months or less.
Investment Securities	Investment Securities
	BancShares classifies marketable investment securities as held to maturity, available for sale or trading. Interest income and dividends on securities are recognized in interest income on an accrual basis. Premiums and discounts on debt securities are amortized as an adjustment to interest income using the interest method. At December 31, 2014 and 2013, BancShares had no investment securities held for trading purposes.
	Debt securities are classified as held to maturity where BancShares has both the intent and ability to hold the securities to maturity. These securities are reported at amortized cost.
	Investment securities that may be sold to meet liquidity needs arising from unanticipated deposit and loan fluctuations, changes in regulatory capital requirements or unforeseen changes in market conditions, are classified as available for sale. Securities available for sale are reported at estimated fair value, with unrealized gains and losses reported in accumulated other comprehensive income or loss, net of deferred income taxes, in the shareholders' equity section of the Consolidated Balance Sheets. Gains or losses realized from the sale of securities available for sale are determined by specific identification on a trade date basis and are included in noninterest income.
	BancShares evaluates each held to maturity and available for sale security in a loss position for other-than-temporary impairment ("OTTI") in accordance with ASC 320-10, Investments - Debt and Equity Securities, at least quarterly. BancShares considers such factors as the length of time and the extent to which the market value has been below amortized cost, long term expectations and recent experience regarding principal and interest payments, BancShares' intent to sell, and whether it is more likely than not that it would be required to sell those securities before the anticipated recovery of the amortized cost basis. The credit component of an OTTI loss is recognized in earnings and the non-credit component is recognized in accumulated other comprehensive income in situations where BancShares does not intend to sell the security, and it is more likely than not that BancShares will not be required to sell the security prior to recovery.
	Nonmarketable Securities - FHLB Stock and TARP Stock
	Federal law requires a member institution of the Federal Home Loan Bank ("FHLB") system to purchase and hold restricted stock of its district FHLB according to a predetermined formula. This stock is restricted in that it may only be sold to the FHLB and all sales must be at par. Accordingly, the FHLB restricted stock is carried at cost, less any applicable impairment charges.
	Investments in preferred stock that had initially been issued under the U.S. Treasury's Troubled Asset Recovery Program ("TARP") and were purchased in the auction process initiated when the U.S. Treasury decided to liquidate its investments are carried at cost, less any applicable impairment charges, because the securities are not traded and an active market does not exist. Nonmarketable securities are periodically evaluated for impairment. BancShares considers positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience when determining the ultimate recoverability of the recorded investment. Investments in FHLB stock and TARP stock are recorded within other assets in BancShares’ Consolidated Balance Sheets.
Loans Held For Sale	Loans Held For Sale
	BancShares has elected to apply the fair value option for new originations of prime residential mortgage loans to be sold at fair value. BancShares elected the fair value option in 2014 and accounts for the forward commitments used to economically hedge the loans held for sale at fair value. Gains and losses on sales of mortgage loans are recognized in the Consolidated Statements of Income in mortgage income. Origination fees collected are deferred and recorded in mortgage income in the period the corresponding loan is sold.
Loans and Leases	Loans and Leases
	BancShares' accounting methods for loans and leases differ depending on whether they are purchased credit-impaired ("PCI") or non-PCI.
	Non-Purchased Credit Impaired ("Non-PCI") Loans and Leases
	Loans and leases for which management has the intent and ability to hold for the foreseeable future are classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs on non-PCI loans. Nonrefundable fees collected and certain direct costs incurred related to loan originations are deferred and recorded as an adjustment to loans and leases outstanding. The net amount of the nonrefundable fees and costs are amortized to interest income over the contractual lives using methods that approximate a constant yield. Net deferred fees on non-PCI loans, including unearned income and unamortized costs, fees, premiums and discounts, totaled $20.8 million and $22.9 million at December 31, 2014 and 2013, respectively.
	Non-PCI loans include originated commercial, originated noncommercial, purchased non-impaired loans and certain purchased revolving credit. For purchased non-impaired loans to be included as non-PCI, it must be determined that the loans do not have a discount at least in part due to credit quality at the time of acquisition. The difference between fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the estimated life of the loans using a method that approximates the interest method.
	Purchased Credit Impaired ("PCI") Loans and Leases
	PCI loans and leases are recorded at fair value at the date of acquisition. No allowance for loan and lease losses is recorded on the acquisition date as the fair value of the acquired assets incorporates assumptions regarding credit risk.
	PCI loans and leases are evaluated at acquisition and where a discount is required at least in part due to credit, the loans are accounted for under the guidance in ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Purchased impaired loans and leases reflect credit deterioration since origination such that it is probable at acquisition that BancShares will be unable to collect all contractually required payments. As of the acquisition date, the difference between contractually required payments and the cash flows expected to be collected is the nonaccretable difference, which is included as a reduction to the carrying amount of PCI loans and leases. If the timing and amount of the future cash flows is reasonably estimable, any excess of cash flows expected at acquisition over the estimated fair value is the accretable yield and is recognized in interest income over the asset's remaining life using the effective yield method.
	Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using the effective interest rates has decreased and if so, recognizes provision for loan and lease losses in its Consolidated Statements of Income. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first through a reversal of previously recognized through provision expense, and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
	Accretion income is recognized on all non-pooled PCI loans and leases except for situations when the timing and amount of future cash flows cannot be determined. PCI loans and leases with uncertain future cash flows are accounted for under the cost recovery method and those loans and leases are generally reported as nonaccrual.
	For PCI loans and leases where the cash flow analysis was initially performed at the loan pool level, the amount of accretable yield and nonaccretable difference is determined at the pool level. Each loan pool is made up of assets with similar characteristics at the date of acquisition including loan type, collateral type and performance status. All loan pools that have accretable yield to be recognized in interest income are classified as accruing regardless of the status of individual loans within the pool.
Impaired Loans, Troubled Debt Restructurings (TDR) and Nonperforming Assets	Impaired Loans, Troubled Debt Restructurings (TDR) and Nonperforming Assets
	Management will deem non-PCI loans and leases to be impaired when, based on current information and events, it is probable that a borrower will be unable to pay all amounts due according to the contractual terms of the loan agreement. Generally, management considers the following loans to be impaired: all TDR loans, commercial and consumer relationships which are nonaccrual or 90+ days past due and greater than $500,000 as well as any other loan management deems impaired. When the ultimate collectability of an impaired loan's principal is doubtful, all cash receipts are applied to principal. Once the recorded principal balance has been reduced to zero, future cash receipts are applied first to all previously charged off principal until fully collected, then to interest income, to the extent that any interest has been foregone.
	A loan is considered a TDR when both of the following occur: (1) a modification to a borrower's debt agreement is made and (2) a concession that is granted for economic or legal reasons related to a borrower's financial difficulties that otherwise would not be granted. TDRs are undertaken in order to improve the likelihood of collection on the loan and may result in a stated interest rate lower than the current market rate for new debt with similar risk, other modifications to the structure of the loan that fall outside of normal underwriting policies and procedures or, in certain limited circumstances, forgiveness of principal or interest. Modifications of PCI loans that are part of a pool accounted for as a single asset are not designated as TDRs. Modifications of non-pooled PCI loans are designated as TDRs in the same manner as non-PCI loans. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual or continuing on accruing status, depending on the individual facts and circumstances of the borrower. In circumstances where a portion of the loan balance is charged off, BancShares typically classifies the remaining balance as nonaccrual.
	In connection with commercial TDRs, the decision to maintain a loan that has been restructured on accrual status is based on a current credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's current capacity to pay, which may include a review of the borrower's current financial statements, an analysis of cash flow documenting the borrower's capacity to pay all debt obligations and an evaluation of secondary sources of payment from the borrower and any guarantors. This evaluation also includes an evaluation of the borrower's current willingness to pay, which may include a review of past payment history, an evaluation of the borrower's willingness to provide information on a timely basis and consideration of offers from the borrower to provide additional collateral or guarantor support. The credit evaluation also reflects consideration of the adequacy of collateral to cover all principal and interest and trends indicating improving profitability and collectability of receivables.
	Nonaccrual TDRs may be returned to accrual status based on a current credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's sustained historical repayment performance for a reasonable period, generally a minimum of six months, prior to the date on which the loan is returned to accrual status. Sustained historical repayment performance for a reasonable time prior to the restructuring may also be considered.
	Nonperforming assets include nonaccrual loans and leases and foreclosed property. Foreclosed property consists of real estate and other assets acquired as a result of loan defaults.
	BancShares classifies all non-PCI loans and leases as past due when the payment of principal and interest based upon contractual terms is greater than 30 days delinquent. Generally, commercial loans are placed on nonaccrual status when principal or interest becomes 90 days past due or when it is probable that principal or interest is not fully collectible, whichever occurs first. Once a loan is placed on nonaccrual status it is evaluated for impairment and a charge-off is recorded in the amount of the impairment. Consumer loans are subject to mandatory charge-off at a specified delinquency date consistent with regulatory guidelines.
	Generally, when loans and leases are placed on nonaccrual status all previously uncollected accrued interest is reversed from interest income. All payments received thereafter are applied as a reduction of the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans and leases 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.
	Other Real Estate Owned ("OREO") acquired as a result of foreclosure is carried at net realizable value. Net realizable value equals fair value less estimated selling costs. Any excess of cost over fair value at the time of foreclosure is charged to the allowance for loan and lease losses. Cost is determined based on the sum of unpaid principal, accrued but unpaid interest and acquisition costs associated with the loan.
	OREO is subject to periodic revaluations of the underlying collateral, at least annually. The periodic revaluations are generally based on the appraised value of the property and may include additional adjustments based upon management's review of the valuation and specific knowledge of the OREO. Routine maintenance costs, subsequent declines in market value and net losses on disposal are included in foreclosed property expense. Gains and losses resulting from the sale or write down of OREO and income and expenses related to its operation are recorded in other noninterest expense.
	OREO covered by loss share agreements with the FDIC ("covered OREO") is reported exclusive of expected reimbursement of cash flows from the FDIC at net realizable value. Subsequent downward adjustments to the estimated recoverable value of covered OREO result in a reduction in covered OREO, a charge to foreclosure related expenses and an increase in the FDIC receivable for the estimated amount to be reimbursed, with a corresponding amount recorded as an adjustment to FDIC receivable. Covered OREO is discussed in more detail below.
Covered Assets and Receivable from FDIC for Loss Share Agreements	Covered Assets and Receivable from FDIC for Loss Share Agreements
	Assets subject to loss share agreements with the FDIC include certain loans and OREO. These loss share agreements afford BancShares significant protection as they cover realized losses on certain loans and other assets purchased from the FDIC during the time period specified in the agreements. Realized losses covered include loan contractual balances, accrued interest on loans for up to 90 days, the book value of foreclosed real estate acquired and certain direct costs, less cash or other consideration received by BancShares.
	The FDIC receivable is recorded at fair value at the acquisition date of the indemnified assets and is measured on the same basis as the underlying loans, subject to collectability and/or contractual limitations. The fair value of the loss share agreements on the acquisition date reflects the discounted reimbursements expected to be received from the FDIC, using an appropriate discount rate, which is based on the market rate for a similar term security at the time of the acquisition adjusted for additional risk premium.
	The loss share agreements continue to be valued on the same basis as the related indemnified assets. Because the PCI loans are subject to the accounting prescribed by ASC 310-30, subsequent changes to the basis of the loss share agreements also follow that model. Deterioration in the credit quality of the loans, which is immediately recorded as an adjustment to the allowance for loan and lease losses, would immediately increase the FDIC receivable, with the offset recorded through the Consolidated Statements of Income in other noninterest income. Improvements in the credit quality or cash flows of loans, which is reflected as an adjustment to yield and accreted into income over the remaining life of the loans, decrease the FDIC receivable, with such decrease being amortized into income over (1) the same period as the underlying loans or (2) the life of the loss share agreements, whichever is shorter. Loss assumptions used in the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification asset. Discounts and premiums reflecting the estimated timing of expected reimbursements are accreted into income over the life of the loss share agreements.
	Collection and other servicing costs related to loans covered under FDIC loss share agreements are charged to noninterest expense as incurred. A receivable from the FDIC is recorded for the estimated amount of such expenses that are expected to be reimbursed and results in an increase to noninterest income. The estimated amount of such reimbursements is determined by several factors including the existence of loan participation agreements with other financial institutions, the presence of partial guarantees from the Small Business Administration and whether a reimbursable loss has been recorded on the loan for which collection and servicing costs have been incurred. Future adjustments to the receivable from the FDIC may be necessary as additional information becomes available related to the amount of previously recorded collection and other servicing costs that will actually be reimbursed by the FDIC and the probable timing of such reimbursements.
Payable to the FDIC for Loss Share Agreements	Payable to the FDIC for Loss Share Agreements
	The purchase and assumption agreements for certain FDIC-assisted transactions include contingent payments that may be owed to the FDIC at the termination of the loss share agreements. The contingent payment is due to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The contingent liability is calculated by discounting estimated future payments and is reported in the Consolidated Balance Sheets as an FDIC loss share payable. The ultimate settlement amount of the contingent payment is dependent upon the performance of the underlying covered loans, the passage of time and actual claims submitted to the FDIC.
Allowance for Loan and Lease Losses (ALLL)	Allowance for Loan and Lease Losses ("ALLL")
	The ALLL represents management's best estimate of probable credit losses within the loan and lease portfolio at the balance sheet date. Management determines the ALLL based on an ongoing evaluation. This evaluation is inherently subjective because it requires material estimates, including the amount and timing of cash flows expected to be received on PCI loans. Those estimates are susceptible to significant change. Adjustments to the ALLL are recorded with a corresponding entry to provision for loan and lease losses. Loan and lease balances deemed to be uncollectible are charged off against the ALLL. Recoveries of amounts previously charged off are generally credited to the ALLL.
	Accounting standards require the presentation of certain information at the portfolio segment level, which represents the level at which the company has developed and documents a systematic methodology to determine its ALLL. BancShares evaluates its loan and lease portfolio using three portfolio segments; non-PCI commercial, non-PCI noncommercial and PCI. The non-PCI commercial segment includes commercial construction and land development, commercial mortgage, commercial and industrial, lease financing and other commercial real estate loans and the related ALLL is calculated based on a risk-based approach as reflected in credit risk grades assigned to individual loans. The non-PCI noncommercial segment includes noncommercial construction and land development, residential mortgage, revolving mortgage and consumer loans and the associated ALLL is determined using a delinquency-based approach.
	BancShares' methodology for calculating the ALLL includes estimating a general allowance for pools of unimpaired loans and specific allocations for significant individual impaired loans for non-PCI loans. The general allowance is based on net historical loan loss experience for homogeneous groups of loans based mostly on loan type then aggregated on the basis of similar risk characteristics and performance trends. This allowance estimate contains qualitative components that allow management to adjust reserves based on historical loan loss experience for changes in the economic environment, portfolio trends and other factors. The methodology also considers the remaining discounts recognized upon acquisition associated with purchase non-impaired loans in estimating a general allowance. The specific allowance component is determined when management believes that the collectability of an individually reviewed loan has been impaired and a loss is probable.
	A primary component of determining the general allowance for performing and classified loans not analyzed specifically is the actual loss history of the various classes. Loan loss factors based on historical experience may be adjusted for significant factors that, in management's judgment, affect the collectability of the portfolio at the balance sheet date. For non-PCI commercial loans and leases, management incorporates historical net loss data to develop the applicable loan loss factors by utilizing information that considers the class of the commercial loan and associated risk rating. For the non-PCI noncommercial segment, management incorporates specific loan class and delinquency status trends into the loan loss factors. Loan loss factors may be adjusted quarterly based on changes in the level of historical net charge-offs and updates by management, such as the number of periods included in the calculation of loss factors, loss severity and portfolio attrition.
	The qualitative framework used in estimating the general allowance considers economic conditions, composition of the loan portfolio, trends in delinquent and nonperforming loans, historical loss experience by categories of loans, concentrations of credit, changes in lending policies and underwriting standards, regulatory exam results and other factors indicative of inherent losses remaining in the portfolio. Management may adjust the ALLL calculated based on historical loan loss factors when assessing changes in the factors in the qualitative framework. The adjustments to the ALLL for the qualitative framework are based on economic data, data analysis of portfolio trends and management judgment. These adjustments are specific to the loan class level.
	The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using their effective interest rates has decreased and if so, recognizes provision for loan and lease losses. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
	Prior to the second quarter of 2013, a portion of the allowance for loan and lease losses was not allocated to any specific class of loans. This nonspecific portion reflected management's best estimate of the elements of imprecision and estimation risk inherent in the calculation of the overall ALLL. During the second quarter of 2013, BancShares implemented enhancements to the process to estimate the ALLL and the reserve for unfunded commitments, described below. Through detailed analysis of historical loss data, the process enhancements enabled allocation of the previously unallocated "nonspecific" ALLL and a portion of the reserve for unfunded loan commitments to specific loan classes. The enhanced ALLL estimates implicitly include the risk of draws on open lines within each loan class. Other than the modifications described above, the enhancements to the methodology did not have a material impact on the ALLL.
	Specific allocations are made for larger, individual impaired loans. All impaired loans are reviewed for potential impairment on a quarterly basis. Specific valuation allowances are established or partial charge-offs are recorded on impaired loans for the difference between the loan amount and the estimated fair value. The fair value of impaired loans is based on the present value of expected cash flows, market prices of the loans, if available, or the value of the underlying collateral. Expected cash flows are discounted at the loans' effective interest rates.
	Management continuously monitors and actively manages the credit quality of the entire loan portfolio and adjusts the ALLL to an appropriate level. By assessing the probable estimated incurred losses in the loan portfolio on a quarterly basis, management is able to adjust specific and general loss estimates based upon the most recent information available. Future adjustments to the ALLL may be necessary based on changes in economic and other conditions. Additionally, various regulatory agencies, as an integral part of their examination process, periodically review BancShares' ALLL. Such agencies may require the recognition of adjustments to the ALLL based on their judgments of information available to them at the time of their examination. Management considers the established ALLL adequate to absorb probable losses that relate to loans and leases outstanding as of December 31, 2014.
	Each portfolio segment and the classes within those segments are subject to risks that could have an adverse impact on the credit quality of the loan and lease portfolio and the related ALLL. Management has identified the most significant risks as described below that are generally similar among the segments and classes. While the list is not exhaustive, it provides a description of the risks management has determined are the most significant.
	Non-PCI Commercial Loans and Leases
	Each originated commercial loan or lease is centrally underwritten based primarily upon the customer's ability to generate the required cash flow to service the debt in accordance with the contractual terms and conditions of the loan agreement. A complete understanding of the borrower's business, including the experience and background of the principals, is obtained prior to approval. To the extent that the loan or lease is secured by collateral, which is true for the majority of commercial loans and leases, the likely value of the collateral and what level of strength the collateral brings to the transaction is evaluated. To the extent that the principals or other parties provide personal guarantees, the relative financial strength and liquidity of each guarantor is assessed.
	The significant majority of relationships in the non-PCI commercial segment are assigned credit risk grades based upon an assessment of conditions that affect the borrower's ability to meet contractual obligations under the loan agreement. This process includes reviewing the borrowers' financial information, payment history, credit documentation, public information and other information specific to each borrower. Credit risk grades are reviewed annually, or at any point management becomes aware of information affecting the borrowers' ability to fulfill their obligations. Our credit risk grading standards are described in Note D.
	The impairment assessment and determination of the related specific reserve for each impaired loan is based on the loan's characteristics. Impairment measurement for loans that are not collateral dependent is based on the present value of expected cash flows discounted at the loan's effective interest rate. Specific valuation allowances are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value for originated loans. Specific valuation allowances for purchased non-impaired loans are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value with consideration for the remaining discounts recognized upon acquisition. Impairment measurement for most real estate loans, particularly when a loan is considered to be a probable foreclosure, is based on the fair value of the underlying collateral. Collateral is appraised and market value, appropriately adjusted for an assessment of the sales and marketing costs as well as the expected holding period, are used to calculate an anticipated fair value.
	General reserves for collective impairment are based on estimated incurred losses related to unimpaired commercial loans and leases as of the balance sheet date. Incurred loss estimates for the originated commercial segment are based on average loss rates by credit risk ratings, which are estimated using historical loss experience and credit risk rating migrations. Incurred loss estimates may be adjusted through a qualitative assessment to reflect current economic conditions and portfolio trends including credit quality, concentrations, aging of the portfolio and significant policy and underwriting changes.
	Common risks to each class of commercial loans include general economic conditions within the markets BancShares serves, as well as risks that are specific to each transaction including demand for products and services, personal events, such as disability or change in marital status and reductions in the value of collateral. Due to the concentration of loans in the medical, dental and related fields, BancShares is susceptible to risks that governmental actions, including implementation of the Affordable Care Act, will fundamentally alter the medical care industry in the United States.
	In addition to these common risks for the majority of the non-PCI commercial segment, additional risks are inherent in certain classes of non-PCI commercial loans and leases.
	Commercial construction and land development
	Commercial construction and land development loans are highly dependent on the supply and demand for commercial real estate in the markets served by BancShares as well as the demand for newly constructed residential homes and lots that customers are developing. Deterioration in demand could result in decreases in collateral values and could make repayment of the outstanding loans more difficult for customers.
	Commercial mortgage, commercial and industrial and lease financing
	Commercial mortgage loans, commercial and industrial loans and lease financing are primarily dependent on the ability of borrowers to achieve business results consistent with those projected at loan origination resulting in cash flow sufficient to service the debt. To the extent that a customer's business results are significantly unfavorable versus the original projections, the ability for the loan to be serviced on a basis consistent with the contractual terms may be at risk. While these loans and leases are generally secured by real property, personal property or business assets such as inventory or accounts receivable, it is possible that the liquidation of the collateral will not fully satisfy the obligation.
	Other commercial real estate
	Other commercial real estate loans consist primarily of loans secured by multifamily housing and agricultural loans. The primary risk associated with multifamily loans is the ability of the income-producing property that collateralizes the loan to produce adequate cash flow to service the debt. High unemployment or generally weak economic conditions may result in customers having to provide rental rate concessions to achieve adequate occupancy rates. The performance of agricultural loans is highly dependent on favorable weather, reasonable costs for seed and fertilizer and the ability to successfully market the product at a profitable margin. The demand for these products is also dependent on macroeconomic conditions that are beyond the control of the borrower.
	Non-PCI Noncommercial Loans and Leases
	Each originated noncommercial loan is centrally underwritten using automated credit scoring and analysis tools. These credit scoring tools take into account factors such as payment history, credit utilization, length of credit history, types of credit currently in use and recent credit inquiries. To the extent that the loan is secured by collateral, the likely value of that collateral is evaluated.
	The ALLL for the non-PCI noncommercial segment is primarily calculated on a pooled basis using a delinquency-based approach. Estimates of incurred losses are based on historical loss experience and the migration of receivables through the various delinquency pools applied to the current risk mix. These estimates may be adjusted through a qualitative assessment to reflect current economic conditions, portfolio trends and other factors. The remaining portion of the ALLL related to the non-PCI noncommercial segment results from loans that are deemed impaired. The impairment assessment and determination of the related specific reserve for each impaired loan is based on the loan's characteristics. Impairment measurement for loans that are not collateral dependent is based on the present value of expected cash flows discounted at the loan's effective interest rate. Specific valuation allowances are established or partial charge-offs are recorded for the difference between the loan amount and the estimated fair value for originated non-PCI loans. Specific valuation allowances for purchased non-impaired loans are established or partial charge offs are recorded for the difference between the loan amount and the estimated fair value with consideration for the remaining discounts recognized upon acquisition. Impairment measurement for most real estate loans, particularly when a loan is considered to be a probable foreclosure, is based on the fair value of the underlying collateral. Collateral is appraised and market value, appropriately adjusted for an assessment of the sales and marketing costs as well as the expected holding period, are used to calculate an anticipated fair value.
	Common risks to each class of noncommercial loans include risks that are not specific to individual transactions such as general economic conditions within the markets BancShares serves, particularly unemployment and potential declines in real estate values. Personal events such as disability or change in marital status also add risk to noncommercial loans.
	In addition to these common risks for the majority of noncommercial loans, additional risks are inherent in certain classes of noncommercial loans.
	Revolving mortgage
	Revolving mortgage loans are often secured by second liens on residential real estate, thereby making such loans particularly susceptible to declining collateral values. A substantial decline in collateral value could render a second lien position to be effectively unsecured. Additional risks include lien perfection inaccuracies, disputes with first lienholders and uncertainty regarding the customer's performance with respect to the first lien that may further weaken the collateral position. Further, the open-end structure of these loans creates the risk that customers may draw on the lines in excess of the collateral value if there have been significant declines since origination.
	Consumer
	The consumer loan portfolio includes loans secured by personal property such as automobiles, marketable securities, other titled recreational vehicles including boats and motorcycles, as well as unsecured consumer debt. The value of underlying collateral within this class is especially volatile due to potential rapid depreciation in values since date of loan origination, potentially in excess of principal balances.
	Residential mortgage and noncommercial construction and land development
	Residential mortgage and noncommercial construction and land development loans are made to individuals and are typically secured by 1-4 family residential property, undeveloped land and partially developed land in anticipation of pending construction of a personal residence. Significant and rapid declines in real estate values can result in residential mortgage loan borrowers having debt levels in excess of the current market value of the collateral. Noncommercial construction and land development projects can experience delays in completion and cost overruns that exceed the borrower's financial ability to complete the project. Such cost overruns can routinely result in foreclosure of partially completed and unmarketable collateral.
	PCI Loans
	The risks associated with PCI loans are generally consistent with the risks identified for commercial and noncommercial non-PCI loans and the classes of loans within those segments. However, these loans were underwritten by other institutions, often with weaker lending standards. Additionally, in some cases, collateral for PCI loans is located in regions that have experienced profound erosion of real estate values. Therefore, there exists a significant risk that PCI loans are not adequately supported by borrower cash flow or the values of underlying collateral.
	The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans and leases, BancShares continues to estimate cash flows expected to be collected on individual loans and leases or on pools of loans and leases sharing common risk characteristics. BancShares evaluates at each balance sheet date whether the estimated cash flows and corresponding present value of its loans and leases determined using their effective interest rates has decreased and if so, recognizes provision for loan and lease losses. For any increases in cash flows expected to be collected, BancShares adjusts any prior recorded allowance for loan and lease losses first and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life.
Reserve for Unfunded Commitments	Reserve for Unfunded Commitments
	The reserve for unfunded commitments represents the estimated probable losses related to unfunded lending commitments, such as letters of credit, financial guarantees and similar binding commitments. The reserve is calculated in a manner similar to the loans evaluated collectively for impairment, while also considering the timing and likelihood that the available credit will be utilized as well as the exposure upon default. The reserve for unfunded commitments is presented within other liabilities on the Consolidated Balance Sheets, distinct from the ALLL, and adjustments to the reserve for unfunded commitments are included in other noninterest expense in the Consolidated Statements of Income.
Premises and Equipment	Premises and Equipment
	Premises, equipment and capital leases are stated at cost less accumulated depreciation and amortization. For financial reporting purposes, depreciation and amortization are computed using the straight-line method and are expensed over the estimated useful lives of the assets, which range from 25 to 40 years for premises and three to 10 years for furniture, software and equipment. Leasehold improvements are amortized over the terms of the respective leases or the useful lives of the improvements, whichever is shorter. Gains and losses on dispositions are recorded in other noninterest expense. Maintenance and repairs are charged to occupancy expense or equipment expense as incurred. Obligations under capital leases are amortized over the life of the lease using the effective interest method to allocate payments between principal and interest. Rent expense and rental income on operating leases are recorded using the straight-line method over the appropriate lease terms.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	BancShares accounts for acquisitions using the acquisition method of accounting. Under acquisition accounting, if the purchase price of an acquired company exceeds the fair value of its net assets, the excess is carried on the acquirer's balance sheet as goodwill. An intangible asset is recognized as an asset apart from goodwill if it arises from contractual or other legal rights or if it is capable of being separated or divided from the acquired entity and sold, transferred, licensed, rented or exchanged. Intangible assets that are separately identifiable assets, such as core deposit intangibles, resulting from acquisitions are amortized on an accelerated basis over an estimated useful life and evaluated for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable.
	Goodwill is not amortized, but is evaluated at least annually for impairment or more frequently if events occur or circumstances change that may trigger a decline in the value of the reporting unit or otherwise indicate that a potential impairment exists. Examples of such events or circumstances include deterioration of general economic conditions, limitations on accessing capital, other equity and credit market developments, adverse change(s) in the environment in which BancShares operates, regulatory or political developments and changes in management, key personnel, strategy or customers. The evaluation of goodwill is based on a variety of factors, including common stock trading multiples and data from comparable acquisitions. Potential impairment of goodwill exists when the carrying amount of a reporting unit exceeds its fair value. In accordance with ASC 350, Intangibles - Goodwill and Other, the fair value for the reporting unit is computed using various methods including market capitalization, price-earnings multiples, price-to-tangible book and market premium.
	To the extent the reporting unit's carrying amount exceeds its fair value, an indication exists that the reporting unit's goodwill may be impaired, which would require the second step of impairment testing to be performed. In the second step, the implied fair value of the reporting unit's goodwill is determined by allocating the reporting unit's fair value to all of its assets (recognized and unrecognized) and liabilities as if the reporting unit had been acquired in a business combination at the date of the impairment test. If the implied fair value of the reporting unit's goodwill is lower than its carrying amount, goodwill is impaired and is written down to the implied fair value. The loss recognized is limited to the carrying amount of goodwill. Once an impairment loss is recognized, future increases in fair value will not result in the reversal of previously recognized losses.
	Annual impairment tests are conducted as of July 31 each year. Based on the July 31, 2014, impairment test, management concluded there was no indication of goodwill impairment. In addition to the annual testing requirement, impairment tests are performed if various other events occur that may trigger a decline in value including significant adverse changes in the business climate, considering various qualitative and quantitative factors to determine whether impairment exists. There were no such events subsequent to the annual impairment test performed during 2014.
	Other intangible assets with estimable lives are amortized over their estimated useful lives, which are periodically reviewed for reasonableness. Identifiable intangible assets represent the estimated value of the core deposits acquired and certain customer relationships.
	Mortgage servicing rights ("MSRs") are recognized separately when they are acquired through sales of loans originated. When mortgage loans are sold, servicing rights are initially recorded at fair value and gains on sale of loans are recorded within mortgage income in the Consolidated Statements of Income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized against mortgage income in non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans with the offset being a reduction in the cost basis of the servicing asset. MSRs are evaluated for impairment quarterly based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics and is recorded as a reduction of mortgage income in the Consolidated Statements of Income. If BancShares later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the valuation reserve may be recorded as an increase to mortgage income in the Consolidated Statements of Income, but only to the extent of previous impairment recognized.
Securities Sold Under Repurchase Agreements	Securities Sold Under Repurchase Agreements
	Securities sold under repurchase agreements generally have maturities of one day and are reflected as short-term borrowings on the Consolidated Balance Sheets and are recorded based on the amount of cash received in connection with the borrowing.
	At December 31, 2014 and 2013, BancShares had $294.4 million and $97.0 million of securities sold under repurchase agreements, respectively.
Fair Values	Fair Values
	Fair value disclosures are required for all financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value. Under GAAP, individual fair value estimates are ranked on a three-tier scale based on the relative reliability of the inputs used in the valuation. Fair values determined using level 1 inputs rely on active and observable markets to price identical assets or liabilities. In situations where identical assets and liabilities are not traded in active markets, fair values may be determined based on level 2 inputs, which represent observable data for similar assets and liabilities. Fair values for assets and liabilities that are not actively traded in observable markets are based on level 3 inputs, which are considered to be nonobservable. Fair value estimates derived from level 3 inputs cannot be substantiated by comparison to independent markets and, in many cases, cannot be realized through immediate settlement of the instrument. Accordingly, the aggregate fair value amounts presented do not necessarily represent the underlying value to BancShares. For additional information, see Note L to the Consolidated Financial Statements.
Income Taxes	Income Taxes
	Deferred income taxes are reported when different accounting methods have been used in determining income for income tax purposes and for financial reporting purposes. Deferred taxes are computed using the asset and liability approach as prescribed in ASC 740, Income Taxes. Under this method, a deferred tax asset or liability is determined based on the currently enacted tax rates applicable to the period in which the differences between the financial statement carrying amounts and tax basis of existing assets and liabilities are expected to be reported in BancShares' income tax returns. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date.
	BancShares continually monitors and evaluates the potential impact of current events on the estimates used to establish income tax expenses and income tax liabilities. On a periodic basis, BancShares evaluates its income tax positions based on current tax law, positions taken by various tax auditors within the jurisdictions that BancShares is required to file income tax returns, as well as potential or pending audits or assessments by such tax auditors.
	BancShares files a consolidated federal income tax return and various combined and separate company state tax returns.
Derivative Financial Instruments	Derivative Financial Instruments
	A derivative is a financial instrument that derives its cash flows, and therefore its value, by reference to an underlying instrument, index or referenced interest rate. These instruments include interest rate swaps, caps, floors, collars, options or other financial instruments designed to hedge exposures to interest rate risk or for speculative purposes.
	BancShares selectively uses interest rate swaps for interest rate risk management purposes. During 2011, BancShares entered into an interest rate swap that qualifies as a cash flow hedge under GAAP. This interest rate swap converts variable-rate exposure on outstanding debt to a fixed rate. The derivative is valued each quarter and changes in the fair value are recorded on the Consolidated Balance Sheets with an offset to other comprehensive income for the effective portion and an offset to the Consolidated Statements of Income for any ineffective portion. The assessment of effectiveness is performed using the long-haul method. BancShares’ interest rate swap has been fully effective since inception; therefore, changes in the fair value of the interest rate swap have had no impact on net income. There are no speculative derivative financial instruments in any period presented.
	In the event of a change in the forecasted cash flows of the underlying hedged item, the related hedge will be terminated, and management will consider the appropriateness of entering into another hedge for the remaining exposure. The fair value of the terminated hedge will be amortized from accumulated other comprehensive income into earnings over the original life of the terminated swap, provided the remaining cash flows are still probable.
Per Share Data	Per Share Data
	Net income per share has been computed by dividing net income by the average number of both classes of common shares outstanding during each period. BancShares had no potential common stock outstanding in any period.
	Cash dividends per share apply to both Class A and Class B common stock. Shares of Class A common stock carry one vote per share, while shares of Class B common stock carry 16 votes per share.
Defined Benefit Pension Plan	Defined Benefit Pension Plan
	BancShares maintains noncontributory defined benefit pension plans to certain qualifying employees. The calculation of the obligations and related expenses under the plans require the use of actuarial valuation methods and assumptions. Actuarial assumptions used in the determination of future values of plan assets and liabilities are subject to management judgment and may differ significantly if different assumptions are used. The discount rate assumption used to measure the plan obligations is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plans are discounted based on this yield curve, and a single discount rate is calculated to achieve the same present value. Refer to Note M in the Consolidated Financial Statements for disclosures related to BancShares' defined benefit pension plans.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements
	Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2014-17, Business Combinations (Topic 805): Pushdown Accounting
	The amendments in this ASU provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. An acquired entity should determine whether to elect to apply pushdown accounting for each individual change-in-control event in which an acquirer obtains control of the acquired entity.
	BancShares adopted the amendments in ASU 2014-17, effective November 18, 2014, as the amendments in the update are effective upon issuance. After the effective date, an acquired entity can make an election to apply to guidance to future change in control events or to its most recent change in control event. However, if the financial statements for the period in which the most recent change in control event occurred already have been issued or made available to be issued, the application of this guidance would be a change in accounting principle. The adoption did not have an impact on our Consolidated Financial Statements.
	FASB ASU 2014-01, Investments - Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects
	This ASU permits an accounting policy election to account for investments in qualified affordable housing projects (LIHTC) using the proportional amortization method 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 recognize the net investment performance in the income statement as a component of income tax expense (benefit).
	For those investments in qualified affordable housing projects not accounted for using the proportional amortization method, the investment should be accounted for as an equity method investment or a cost method investment in accordance with ASC 970-323.
	The decision to apply the proportional amortization method of accounting will be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments.
	BancShares early adopted the guidance effective in the fourth quarter of 2014. Previously, LIHTC investments were accounted for under the cost or equity method, and the amortization was recorded as a reduction to other noninterest income, with the tax credits and other benefits received recorded as a component of the provision for income taxes. BancShares believes the proportional amortization method better represents the economics of LIHTC investments and provides users with a better understanding of the returns from such investments than the cost or equity method. LIHTC investments were $57.1 million and $63.6 million for 2014 and 2013, respectively, included in "other assets" on the Consolidated Balance Sheets.
	The cumulative effect of the retrospective application of the change in amortization method was a $2.4 million decrease to both "other assets" and "retained earnings" on the Consolidated Balance Sheets as of January 1, 2012. Under the new amortization method of accounting, amortization expense is recognized in income tax expense in the Consolidated Statements of Income and is offset by the tax effect of tax losses and tax credits received from the investments. This change resulted in a reclassification of expense previously recorded as a reduction in other noninterest income to income tax expense along with additional amortization recognized under the new method of accounting in the Consolidated Statements of Income. An additional change resulting from the new amortization method of accounting was that a deferred tax asset or liability no longer exists as a result of these investments, thus in the retrospective application of the new method, the removal of the deferred tax asset previously reported as well as the additional amortization of the investments, both recorded in other assets, reflected in the Consolidated Balance Sheets were removed. We do not believe the impact of this change in accounting principle is material.
	FASB ASU 2013-11, Income Taxes (Topic 740)
	This ASU states that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require BancShares to use, and BancShares does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date.
	The provisions of this ASU were effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. BancShares adopted the guidance effective in the first quarter of 2014. The initial adoption had no effect on our consolidated financial position or consolidated results of operations.
	FASB ASU 2013-04, Liabilities
	This ASU provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this ASU is fixed at the reporting date, except for obligations addressed within existing guidance in GAAP.
	The amendments in this update were effective for fiscal years beginning after December 31, 2013. BancShares adopted the guidance effective first quarter of 2014. The initial adoption did not have any effect on our consolidated financial position or consolidated results of operations.
	Recently Issued Accounting Pronouncements
	FASB ASU 2014-14, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
	This ASU requires a reporting entity to derecognize a mortgage loan and recognize a separate other receivable upon foreclosure if the following conditions are met: the loan has a government guarantee that is not separable from the loan before foreclosure; at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim and at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance expected to be recovered from the guarantor.
	The amendments in this ASU are effective for public entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2015.
	FASB ASU 2014-11, Transfers and Servicing (Topic 860)
	This ASU aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The ASU requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The ASU also requires expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.
	The accounting changes in this ASU are effective for fiscal years beginning after December 15, 2014. In addition, the disclosure for certain transactions accounted for as a sale is effective for the fiscal period beginning after December 15, 2014, the disclosures for transactions accounted for as secured borrowings are required to be presented for fiscal periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. Early adoption is not permitted. BancShares will adopt the guidance effective in the first quarter of 2015, and is currently evaluating the impact of the new standard on the financial statement disclosures. BancShares does not anticipate any effect on our consolidated financial position or consolidated results of operations as a result of adoption.
	FASB ASU 2014-09, Revenue from Contracts with Customers (Topic 606)
	In May 2014, the FASB issued a standard on the recognition of revenue from contracts with customers with the core principle being for companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard also results in enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively and improves guidance for multiple-element arrangements.
	The guidance in this ASU is effective for fiscal periods beginning after December 15, 2016, including interim reporting periods within that reporting period. Early adoption is not permitted. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2017 using one of two retrospective application methods.
	FASB ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40)
	This ASU clarifies that 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. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction.
	The amendments in this ASU are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. BancShares will adopt the guidance effective in the first quarter of 2015, and is currently evaluating the impact of the new standard on the financial statement disclosures. BancShares does not anticipate any significant impact on our consolidated financial position or consolidated results of operations as a result of adoption.

Business_Combinations_Business1

Business Combinations Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Pro Forma Financial Information for Bancoporiation Acquisition
		Year ended December 31
	(Dollars in thousands, unaudited)	2014			2013
	Total revenue (interest income plus noninterest income)	$	1,336,340		$	1,412,226
	Net income (loss)	$	(13,171	)	$	210,529
Bancorporation
Business Acquisition [Line Items]
Schedule of Assets Acquired and Liabilities Assumed	The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values.
	(Dollars in thousands)
	Purchase Price
	Value of shares of BancShares Class A common stock issued to Bancorporation shareholders				$	560,370
	Value of shares of BancShares Class B common stock issued to Bancorporation shareholders				3,877
	Cash paid to Bancorporation shareholders				30,394
	Fair value of Bancorporation shares owned by BancShares				29,551
	Total purchase price				624,192
	Assets
	Cash and due from banks	$	194,570
	Overnight investments	1,087,325
	Investment securities available for sale	2,011,263
	Loans held for sale	30,997
	Loans and leases	4,491,067
	Premises and equipment	238,646
	Other real estate owned	35,344
	Income earned not collected	15,266
	FDIC loss share receivable	5,106
	Other intangible assets	109,416
	Other assets	56,367
	Total assets acquired	8,275,367
	Liabilities
	Deposits	7,174,817
	Short-term borrowings	295,681
	Long-term obligations	124,852
	FDIC loss share payable	224
	Other liabilities	59,834
	Total liabilities assumed	$	7,655,408
	Fair value of net assets acquired				619,959
	Goodwill recorded for Bancorporation				$	4,233
1st Financial
Business Acquisition [Line Items]
Schedule of Assets Acquired and Liabilities Assumed	The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values.
	(Dollars in thousands)
	Purchase Price
	Cash paid to shareholders				$	2,000
	Cash paid to acquire and retire TARP securities				8,000
	Total purchase price				10,000
	Assets
	Cash and due from banks	$	28,194
	Investment securities available for sale	237,438
	Loans held for sale	1,183
	Restricted equity securities	3,776
	Loans	307,927
	Premises and equipment	2,686
	Other real estate owned	11,591
	Other intangible assets	3,780
	Other assets	16,346
	Total assets acquired	612,921
	Liabilities
	Deposits	631,871
	Short-term borrowings	406
	Other liabilities	3,559
	Total liabilities assumed	$	635,836
	Fair value of net liabilities assumed				22,915
	Goodwill recorded for 1st Financial				$	32,915

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Aggregate Values And Unrealized Gains And Losses Of Investment Securities	December 31, 2014 and 2013, were as follows:
		31-Dec-14
	(Dollars in thousands)	Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Investment securities available for sale
	U.S. Treasury	$	2,626,900		$	2,922	$	152		$	2,629,670
	Government agency	908,362			702		247			908,817
	Mortgage-backed securities	3,628,187			16,964		11,847			3,633,304
	Municipal securities	125			1		—			126
	Total investment securities available for sale	$	7,163,574		$	20,589	$	12,246		$	7,171,917
		December 31, 2013
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	U.S. Treasury	$	373,223		$	259	$	45		$	373,437
	Government agency	2,543,223			1,798		792			2,544,229
	Mortgage-backed securities	2,486,297			4,526		43,950			2,446,873
	Equity securities	543			21,604		—			22,147
	Municipal securities	186			1		—			187
	Other	863			—		33			830
	Total investment securities available for sale	$	5,404,335		$	28,188	$	44,820		$	5,387,703
		December 31, 2014
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Investment securities held to maturity
	Mortgage-backed securities	$	518		$	26	$	—		$	544
		December 31, 2013
		Cost			Gross		Gross unrealized			Fair
					unrealized		losses			value
					gains
	Mortgage-backed securities	$	907		$	67	$	—		$	974
Investment Securities Maturity Information	The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Repayments of mortgage-backed securities are dependent on the repayments of the underlying loan balances. Equity securities do not have a stated maturity date.
		December 31, 2014					December 31, 2013
	(Dollars in thousands)	Cost			Fair		Cost			Fair
					value					value
	Investment securities available for sale
	Non-amortizing securities maturing in:
	One year or less	$	447,866		$	447,992	$	839,956		$	840,883
	One through five years	3,087,521			3,090,621		2,077,539			2,077,800
	Mortgage-backed securities	3,628,187			3,633,304		2,486,297			2,446,873
	Equity securities	—			—		543			22,147
	Total investment securities available for sale	$	7,163,574		$	7,171,917	$	5,404,335		$	5,387,703
	Investment securities held to maturity
	Mortgage-backed securities held to maturity	$	518		$	544	$	907		$	974
Securities Gains (Losses)	For each period presented, securities gains (losses) include the following:
		Year ended December 31
	(Dollars in thousands)	2014			2013		2012
	Gross gains on retirement/sales of investment securities available for sale	$	29,129		$	—	$	2,324
	Gross losses on sales of investment securities available for sale	(33		)	—		(2		)
	Other than temporary impairment loss on equity securities	—			—		(45		)
	Total securities gains	$	29,096		$	—	$	2,277
Investment Securities With Unrealized Losses	The following table provides information regarding securities with unrealized losses as of December 31, 2014 and 2013.
		December 31, 2014
		Less than 12 months					12 months or more					Total
	(Dollars in thousands)	Fair			Unrealized		Fair			Unrealized		Fair		Unrealized
		Value			Losses		Value			Losses		Value		Losses
	Investment securities available for sale:
	U.S. Treasury	$	338,612		$	151	$	1,015		$	1	$	339,627	$	152
	Government agency	261,288			247		—			—		261,288		247
	Mortgage-backed securities	573,374			1,805		831,405			10,042		1,404,779		11,847
	Total	$	1,173,274		$	2,203	$	832,420		$	10,043	$	2,005,694	$	12,246
		December 31, 2013
		Less than 12 months					12 months or more					Total
		Fair			Unrealized		Fair			Unrealized		Fair		Unrealized
		Value			Losses		Value			Losses		Value		Losses
	Investment securities available for sale:
	U.S. Treasury	$	102,105		$	45	$	—		$	—	$	102,105	$	45
	Government agency	780,552			761		29,969			31		810,521		792
	Mortgage-backed securities	2,221,213			42,876		26,861			1,074		2,248,074		43,950
	Other	830			33		—			—		830		33
	Total	$	3,104,700		$	43,715	$	56,830		$	1,105	$	3,161,530	$	44,820

Loans_and_Leases_Tables

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Loans And Leases Outstanding	Loans and leases outstanding include the following as of the dates indicated:
	(Dollars in thousands)	December 31, 2014			December 31, 2013
	Loans and leases (non-PCI)(1):
	Commercial:
	Construction and land development	550,568			319,847
	Commercial mortgage	7,552,948			6,362,490
	Other commercial real estate	244,875			178,754
	Commercial and industrial	1,988,934			1,081,158
	Lease financing	571,916			381,763
	Other	353,833			175,336
	Total commercial loans	11,263,074			8,499,348
	Noncommercial:
	Residential mortgage	2,520,542			982,421
	Revolving mortgage	2,561,800			2,113,285
	Construction and land development	120,097			122,792
	Consumer	1,117,454			386,452
	Total noncommercial loans	6,319,893			3,604,950
	Total non-PCI loans and leases	17,582,967			12,104,298
	Purchased credit-impaired (PCI) loans:
	Commercial:
	Construction and land development	$	78,079		$	78,915
	Commercial mortgage	577,518			642,891
	Other commercial real estate	40,193			41,381
	Commercial and industrial	27,254			17,254
	Other	3,079			866
	Total commercial loans	726,123			781,307
	Noncommercial:
	Residential mortgage	382,340			213,851
	Revolving mortgage	74,109			30,834
	Construction and land development	912			2,583
	Consumer	3,014			851
	Total noncommercial loans	460,375			248,119
	Total PCI loans	1,186,498			1,029,426
	Total loans and leases	$	18,769,465		$	13,133,724
	(1) Non-PCI loans include originated and purchased non-impaired loans, including non-accrual and TDR loans.
Composition Of The Loans And Leases Outstanding By Credit Quality Indicator	The composition of the loans and leases outstanding at December 31, 2014, and December 31, 2013, by credit quality indicator is provided below:
		Non-PCI commercial loans and leases
	(Dollars in thousands)	Construction and land			Commercial			Other		Commercial and		Lease financing		Other		Total non-PCI commercial loans and leases
		development			mortgage			commercial real estate		industrial
	Grade:
	December 31, 2014
	Pass	$	525,711		$	7,284,714		$	242,053	$	1,859,415	$	564,319	$	349,111	$	10,825,323
	Special mention	20,025			129,247			909		27,683		3,205		1,384		182,453
	Substandard	4,720			134,677			1,765		8,878		3,955		3,338		157,333
	Doubtful	—			2,366			—		164		365		—		2,895
	Ungraded	112			1,944			148		92,794		72		—		95,070
	Total	$	550,568		$	7,552,948		$	244,875	$	1,988,934	$	571,916	$	353,833	$	11,263,074
	December 31, 2013
	Pass	$	308,231		$	6,094,505		$	174,913	$	964,840	$	375,371	$	174,314	$	8,092,174
	Special mention	8,620			119,515			1,362		14,686		2,160		982		147,325
	Substandard	2,944			141,913			2,216		6,352		3,491		40		156,956
	Doubtful	52			5,159			75		144		592		—		6,022
	Ungraded	—			1,398			188		95,136		149		—		96,871
	Total	$	319,847		$	6,362,490		$	178,754	$	1,081,158	$	381,763	$	175,336	$	8,499,348
		Non-PCI noncommercial loans and leases
	(Dollars in thousands)	Residential			Revolving			Construction		Consumer		Total non-PCI noncommercial
		mortgage			mortgage			and land				loans and leases
								development
	December 31, 2014
	Current	$	2,482,281		$	2,542,807		$	119,094	$	1,110,153	$	6,254,335
	30-59 days past due	23,288			11,097			370		4,577		39,332
	60-89 days past due	6,018			2,433			486		1,619		10,556
	90 days or greater past due	8,955			5,463			147		1,105		15,670
	Total	$	2,520,542		$	2,561,800		$	120,097	$	1,117,454	$	6,319,893
	December 31, 2013
	Current	$	955,300		$	2,095,480		$	121,026	$	382,710	$	3,554,516
	30-59 days past due	12,885			10,977			1,193		2,114		27,169
	60-89 days past due	4,658			2,378			317		955		8,308
	90 days or greater past due	9,578			4,450			256		673		14,957
	Total	$	982,421		$	2,113,285		$	122,792	$	386,452	$	3,604,950
		December 31, 2014
	(Dollars in thousands)	PCI commercial loans
	Grade:	Construction			Commercial			Other		Commercial		Other		Total PCI commercial
		and land			mortgage			commercial		and				loans
		development						real estate		industrial
	Pass	$	13,514		$	300,187		$	11,033	$	16,637	$	801	$	342,172
	Special mention	6,063			98,724			16,271		4,137		—		125,195
	Substandard	53,739			171,920			12,889		6,312		2,278		247,138
	Doubtful	2,809			6,302			—		130		—		9,241
	Ungraded	1,954			385			—		38		—		2,377
	Total	$	78,079		$	577,518		$	40,193	$	27,254	$	3,079	$	726,123
		December 31, 2013
		PCI commercial loans
		Construction			Commercial			Other		Commercial		Other		Total PCI commercial
		and land			mortgage			commercial		and				loans
		development						real estate		industrial
	Pass	$	2,619		$	296,824		$	22,225	$	8,021	$	866	$	330,555
	Special mention	15,530			125,295			3,431		2,585		—		146,841
	Substandard	52,228			179,657			7,012		5,225		—		244,122
	Doubtful	7,436			40,471			8,713		1,257		—		57,877
	Ungraded	1,102			644			—		166		—		1,912
	Total	$	78,915		$	642,891		$	41,381	$	17,254	$	866	$	781,307
		PCI noncommercial loans and leases
	(Dollars in thousands)	Residential			Revolving			Construction		Consumer		Total non-PCI noncommercial
		mortgage			mortgage			and land				loans
								development
	December 31, 2014
	Current	$	326,589		$	68,548		$	506	$	2,582	$	398,225
	30-59 days past due	11,432			1,405			—		147		12,984
60-89 days past due	10,073			345			—		25		10,443
90 days or greater past due	34,246			3,811			406		260		38,723
Total	$	382,340		$	74,109		$	912	$	3,014	$	460,375
December 31, 2013
Current	$	162,771		$	26,642		$	1,925	841		$	192,179
30-59 days past due	15,261			2,138			—		3		17,402
60-89 days past due	6,544			—			—		—		6,544
90 days or greater past due	29,275			2,054			658		7		31,994
Total	$	213,851		$	30,834		$	2,583	$	851	$	248,119
Aging Of The Outstanding Loans And Leases By Class Excluding Loans Impaired At Acquisition Date	The aging of the outstanding non-PCI loans and leases, by class, at December 31, 2014, and December 31, 2013 is provided in the table below. The calculation of days past due begins on the day after payment is due and includes all days through which all required interest or principal has not been paid. Loans and leases 30 days or less past due are considered current due to various grace periods that allow borrowers to make payments within a stated period after the due date and still remain in compliance with the loan agreement.
		December 31, 2014
	(Dollars in thousands)	30-59 days			60-89 days			90 days or greater		Total past		Current		Total loans
		past due			past due					due				and leases
	Non-PCI loans and leases:
	Construction and land development - commercial	$	1,796		$	621		$	385	$	2,802	$	547,766	$	550,568
	Commercial mortgage	11,367			4,782			8,061		24,210		7,528,738		7,552,948
	Other commercial real estate	206			70			102		378		244,497		244,875
	Commercial and industrial	2,843			1,545			378		4,766		1,984,168		1,988,934
	Lease financing	1,631			8			2		1,641		570,275		571,916
	Residential mortgage	23,288			6,018			8,955		38,261		2,482,281		2,520,542
	Revolving mortgage	11,097			2,433			5,463		18,993		2,542,807		2,561,800
	Construction and land development - noncommercial	370			486			147		1,003		119,094		120,097
	Consumer	4,577			1,619			1,105		7,301		1,110,153		1,117,454
	Other	146			1,966			—		2,112		351,721		353,833
	Total non-PCI loans and leases	$	57,321		$	19,548		$	24,598	$	101,467	$	17,481,500	$	17,582,967
		December 31, 2013
		30-59 days			60-89 days			90 days or greater		Total past		Current		Total loans
		past due			past due					due				and leases
	Non-PCI loans and leases:
	Construction and land development - commercial	$	1,603		$	9		$	457	$	2,069	$	317,778	$	319,847
	Commercial mortgage	11,131			3,601			14,407		29,139		6,333,351		6,362,490
	Other commercial real estate	139			210			470		819		177,935		178,754
	Commercial and industrial	3,336			682			436		4,454		1,076,704		1,081,158
	Lease financing	789			1,341			101		2,231		379,532		381,763
	Residential mortgage	12,885			4,658			9,578		27,121		955,300		982,421
	Revolving mortgage	10,977			2,378			4,450		17,805		2,095,480		2,113,285
	Construction and land development - noncommercial	1,193			317			256		1,766		121,026		122,792
	Consumer	2,114			955			673		3,742		382,710		386,452
	Other	—			85			—		85		175,251		175,336
	Total non-PCI loans and leases	$	44,167		$	14,236		$	30,828	$	89,231	$	12,015,067	$	12,104,298
Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing	The recorded investment, by class, in loans and leases on nonaccrual status, and loans and leases greater than 90 days past due and still accruing at December 31, 2014 and December 31, 2013 for non-PCI loans, were as follows:
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Nonaccrual			Loans and			Nonaccrual		Loans and
		loans and			leases > 90			loans and		leases > 90
		leases			days and			leases		days and
					accruing					accruing
	Non-PCI loans and leases:
	Construction and land development - commercial	$	343		$	111		$	544	$	—
	Commercial mortgage	24,720			1,003			33,529		1,113
	Commercial and industrial	1,741			239			1,428		294
	Lease financing	374			2			832		—
	Other commercial real estate	619			35			1,610		—
	Construction and land development - noncommercial	—			147			457		256
	Residential mortgage	14,242			3,191			14,701		1,998
	Revolving mortgage	—			5,463			—		4,450
	Consumer	—			1,059			69		673
	Other	1,966			—			—		—
	Total non-PCI loans and leases	$	44,005		$	11,250		$	53,170	$	8,784
Changes In Carrying Value Of Acquired Impaired Loans	The following table provides changes in the carrying value of purchased credit-impaired loans during the years ended December 31, 2014 and 2013:
	(Dollars in thousands)	2014			2013
	Balance at January 1	$	1,029,426		$	1,809,235
	Fair value of PCI loans acquired during the year	623,408			—
	Accretion	112,368			224,672
	Payments received and other changes, net	(578,704		)	(1,004,481		)
	Balance at December 31	$	1,186,498		$	1,029,426
	Unpaid principal balance at December 31	$	2,057,691		$	1,833,955
Changes In The Amount Of Accretable Yield	Purchased non-impaired loans and leases
	The following table relates to purchased non-impaired loans and leases and provides the contractually required payments, estimate of contractual cash flows not expected to be collected and fair value of the acquired loans at the merger date.
	(Dollars in thousands)
	Contractually required payments	$	4,708,681
	Contractual cash flows not expected to be collected	$	59,187
	Fair value at acquisition date	$	4,175,586
	The recorded fair values of purchased non-impaired loans and leases acquired in the Bancorporation transaction as of the merger date is as follows:
	(Dollars in thousands)
	Commercial:
	Construction and land development	$	134,941
	Commercial mortgage	951,794
	Other commercial real estate	61,856
	Commercial and industrial	431,367
	Lease financing	72,563
	Other	95,379
	Total commercial loans and leases	1,747,900
	Noncommercial:
	Residential mortgage	1,305,140
	Revolving mortgage	419,106
	Construction and land development	7,165
	Consumer	696,275
	Total noncommercial loans and leases	2,427,686
	Total non-PCI loans and leases	$	4,175,586
	The unamortized discount related to the purchased non-impaired loans and leases acquired in the Bancorporation merger totaled $61.2 million at December 31, 2014.

Loans_and_Leases_Schedule_of_L

Loans and Leases Schedule of Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans And Leases Outstanding	Loans and leases outstanding include the following as of the dates indicated:
	(Dollars in thousands)	December 31, 2014		December 31, 2013
	Loans and leases (non-PCI)(1):
	Commercial:
	Construction and land development	550,568		319,847
	Commercial mortgage	7,552,948		6,362,490
	Other commercial real estate	244,875		178,754
	Commercial and industrial	1,988,934		1,081,158
	Lease financing	571,916		381,763
	Other	353,833		175,336
	Total commercial loans	11,263,074		8,499,348
	Noncommercial:
	Residential mortgage	2,520,542		982,421
	Revolving mortgage	2,561,800		2,113,285
	Construction and land development	120,097		122,792
	Consumer	1,117,454		386,452
	Total noncommercial loans	6,319,893		3,604,950
	Total non-PCI loans and leases	17,582,967		12,104,298
	Purchased credit-impaired (PCI) loans:
	Commercial:
	Construction and land development	$	78,079	$	78,915
	Commercial mortgage	577,518		642,891
	Other commercial real estate	40,193		41,381
	Commercial and industrial	27,254		17,254
	Other	3,079		866
	Total commercial loans	726,123		781,307
	Noncommercial:
	Residential mortgage	382,340		213,851
	Revolving mortgage	74,109		30,834
	Construction and land development	912		2,583
	Consumer	3,014		851
	Total noncommercial loans	460,375		248,119
	Total PCI loans	1,186,498		1,029,426
	Total loans and leases	$	18,769,465	$	13,133,724
	(1) Non-PCI loans include originated and purchased non-impaired loans, including non-accrual and TDR loans.

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Allowance for Loan and Lease Losses, Adjustments, Net [Abstract]
Allocation of Allowance for Loan and Lease Losses [Table Text Block]	Activity in the allowance for loan and lease losses is as follows:
		Non-PCI			PCI				Total
	(dollars in thousands)
	Balance at December 31, 2011	$	180,883		$	89,261			$	270,144
	Provision for loan and lease losses	42,046			100,839				142,885
	Loans and leases charged off	(50,208		)	(50,270		)		(100,478		)
	Loans and leases recovered	6,325			142				6,467
	Net charge-offs	(43,883		)	(50,128		)		(94,011		)
	Balance at December 31, 2012	179,046			139,972				319,018
	Reclassification (1)	7,368			—				7,368
	Provision (credit) for loan and lease losses	19,289			(51,544		)		(32,255		)
	Loans and leases charged off	(33,118		)	(34,908		)		(68,026		)
	Loans and leases recovered	7,289			—				7,289
	Net charge-offs	(25,829		)	(34,908		)		(60,737		)
	Balance at December 31, 2013	179,874			53,520				233,394
	Provision (credit) for loan and lease losses	15,260			(14,620		)		640
	Loans and leases charged off	(20,499		)	(17,271		)		(37,770		)
	Loans and leases recovered	8,202			—				8,202
	Net charge-offs	(12,297		)	(17,271		)		(29,568		)
	Balance at December 31, 2014	$	182,837		$	21,629			$	204,466
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	Activity in the allowance for loan and lease losses, ending balances of loans and leases and related allowance by class of loans is summarized as follows:
		For the twelve months ended December 31, 2014, 2013, and 2012
		Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Non-			Total
		and land			mortgage				commercial				and				financing						mortgage			mortgage			and land						specific
		development							real estate				industrial																development
		- commercial																											- non-
																													commercial
	(Dollars in thousands)
	Non-PCI Loans
	Allowance for loan and lease losses:
	Balance at January 1, 2012	$	5,467		$	67,486			$	2,169			$	23,723			$	3,288		$	1,315		$	8,879		$	27,045		$	1,427		$	25,962		$	14,122		$	180,883
	Provision (credits)	9,665			18,198				130				(4,982		)		498			(116		)	(782		)	8,783			1,161			7,763			1,728			42,046
	Charge-offs	(9,546		)	(7,081		)		(254		)		(5,472		)		(361		)	(28		)	(4,790		)	(11,341		)	(1,047		)	(10,288		)	—			(50,208		)
	Recoveries	445			1,626				14				781				96			4			529			698			180			1,952			—			6,325
	Balance at December 31, 2012	6,031			80,229				2,059				14,050				3,521			1,175			3,836			25,185			1,721			25,389			15,850			179,046
	Reclassification (1)	5,141			27,421				(815		)		7,551				(253		)	(1,288		)	5,717			(9,838		)	(478		)	(10,018		)	(15,772		)	7,368
	Provision (credits)	2,809			(4,485		)		(32		)		4,333				1,646			308			2,786			6,296			(379		)	6,085			(78		)	19,289
	Charge-offs	(4,685		)	(3,904		)		(312		)		(4,785		)		(272		)	(6		)	(2,387		)	(6,064		)	(392		)	(10,311		)	—			(33,118		)
	Recoveries	1,039			996				109				1,213				107			1			559			660			209			2,396			—			7,289
	Balance at December 31, 2013	10,335			100,257				1,009				22,362				4,749			190			10,511			16,239			681			13,541			—			179,874
	Provision (credits)	1,735			(16,746		)		(401		)		10,441				(473		)	3,007			1,219			6,301			245			9,932			—			15,260
	Charge-offs	(316		)	(1,147		)		—				(3,014		)		(100		)	(13		)	(1,260		)	(4,744		)	(118		)	(9,787		)	—			(20,499		)
	Recoveries	207			2,825				124				938				110			—			191			854			84			2,869			—			8,202
	Balance at December 31, 2014	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	—		$	182,837
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	The commercial mortgage loan class had a net credit provision of $16.7 million for the year ended December 31, 2014 compared to a net credit provision of $4.5 million for the year ended December 31, 2013. The increase in the net credit provision was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The provision expense for commercial and industrial loans totaled $10.4 million for the year ended December 31, 2014 compared to $4.3 million for the year ended December 31, 2013. Loan growth of $907.8 million during the year was the primary result of the increase in provision expense.
	The provision for lease financing was a net credit of $0.5 million for the year ended December 31, 2014 compared to a provision expense of $1.6 million for the year ended December 31, 2013. The decrease was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The other loan class had a provision expense of $3.0 million for the year ended December 31, 2014 compared to a provision expense of $0.3 million for the year ended December 31, 2013. The increase in the provision expense was attributable to newly originated loans as well as declining trends in credit risk ratings and defaults.
		December 31, 2014
	(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
		and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
		development							real estate																				development
		- commercial																											- non-commercial
	Non-PCI Loans
	Allowance for loan and lease losses:
	ALLL for loans and leases individually evaluated for impairment	$	92		$	8,610			$	112			$	1,743			$	150		$	1,972		$	1,360		$	1,052		$	71		$	555		$	15,717
	ALLL for loans and leases collectively evaluated for impairment	11,869			76,579				620				28,984				4,136			1,212			9,301			17,598			821			16,000			167,120
	Total allowance for loan and lease losses	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	182,837
	Loans and leases:
	Loans and leases individually evaluated for impairment	$	1,620		$	82,803			$	584			$	11,040			$	623		$	2,000		$	14,913		$	3,675		$	1,340		$	995		$	119,593
	Loans and leases collectively evaluated for impairment	548,948			7,470,145				244,291				1,977,894				571,293			351,833			2,505,629			2,558,125			118,757			1,116,459			17,463,374
	Total loan and leases	$	550,568		$	7,552,948			$	244,875			$	1,988,934			$	571,916		$	353,833		$	2,520,542		$	2,561,800		$	120,097		$	1,117,454		$	17,582,967
	December 31, 2013
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
	development							real estate																				development
	- commercial																											- non-commercial
Non-PCI Loans
Allowance for loan and lease losses:
ALLL for loans and leases individually evaluated for impairment	$	103		$	6,873			$	209			$	771			$	54		$	—		$	1,586		$	372		$	72		$	121		$	10,161
ALLL for loans and leases collectively evaluated for impairment	$	10,232		$	93,384			$	800			$	21,591			$	4,695		$	190		$	8,925		$	15,867		$	609		$	13,420		$	169,713
Total allowance for loan and lease losses	$	10,335		$	100,257			$	1,009			$	22,362			$	4,749		$	190		$	10,511		$	16,239		$	681		$	13,541		$	179,874
Loans and leases:
Loans and leases individually evaluated for impairment	$	2,272		$	97,111			$	1,878			$	9,300			$	188		$	—		$	15,539		$	3,596		$	1,108		$	1,154		$	132,146
Loans and leases collectively evaluated for impairment	317,575			6,265,379				176,876				1,071,858				381,575			175,336			966,882			2,109,689			121,684			385,298			11,972,152
Total loan and leases	$	319,847		$	6,362,490			$	178,754			$	1,081,158			$	381,763		$	175,336		$	982,421		$	2,113,285		$	122,792		$	386,452		$	12,104,298
In the non-PCI commercial mortgage segment, loans and leases individually evaluated for impairment decreased $14.3 million to $82.8 million as of December 31, 2014 due to credit quality improvement as certain loans were no longer considered impaired during 2014 and fewer loans were identified for impairment. Reserves on impaired commercial mortgage loans increased $1.7 million due to cash flow deterioration on various individual large relationships.
Other loans and leases individually evaluated for impairment increased $2.0 million as of December 31, 2014 primarily due to one lending relationship which was almost fully reserved due to the loan being placed on nonaccrual status and being unsecured.
Non-PCI loans and leases individually evaluated for impairment decreased $12.6 million to $119.6 million at December 31, 2014 in comparison to December 31, 2013 due to continued credit quality improvements, primarily in the commercial mortgage portfolio. In contrast, Non-PCI loans and leases collectively evaluated for impairment increased $5.49 billion from December 31, 2013 to December 31, 2014. This increase is driven by the addition of non-PCI loans acquired in the Bancorporation merger of $4.18 billion as of the acquisition date and originated loan growth.
	For the twelve months ended December 31, 2014, 2013, and 2012
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and				financing			mortgage			mortgage			and land			and other
	development -							real estate				industrial													development -
	commercial																								noncommercial
PCI Loans
Allowance for loan and lease losses:
Balance at January 1, 2012	$	16,693		$	39,557			$	16,862			$	5,500			$	13		$	5,433		$	77		$	4,652		$	474		$	89,261
Provision (credits)	23,160			34,227				(4,372		)		11,839				(13		)	18,401			10,796			6,520			281			100,839
Charge-offs	(8,667		)	(23,509		)		(1,256		)		(8,442		)		—			(4,139		)	(1,119		)	(2,885		)	(253		)	(50,270		)
Recoveries	—			—				—				—				—			142			—			—			—			142
Balance at December 31, 2012	31,186			50,275				11,234				8,897				—			19,837			9,754			8,287			502			139,972
Provision (credits)	(22,942		)	(3,872		)		(8,949		)		470				—			(5,487		)	(6,399		)	(4,170		)	(195		)	(51,544		)
Charge-offs	(6,924		)	(16,497		)		(931		)		(4,092		)		—			(2,548		)	(396		)	(3,435		)	(85		)	(34,908		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2013	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Provision (credits)	1,284			(7,903		)		(1,385		)		(2,023		)		—			(5,576		)	1,523			(395		)	(145		)	(14,620		)
Charge-offs	(2,454		)	(11,868		)		106				(2,012		)		—			(406		)	(483		)	(104		)	(50		)	(17,271		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2014	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
December 31, 2014
ALLL for loans and leases acquired with deteriorated credit quality	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
Loans and leases acquired with deteriorated credit quality	78,079			577,518				40,193				27,254				—			382,339			74,109			912			6,094			1,186,498
December 31, 2013
ALLL for loans and leases acquired with deteriorated credit quality	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Loans and leases acquired with deteriorated credit quality	78,915			642,891				41,381				17,254				—			213,851			30,834			2,583			1,717			1,029,426
Allowance for Loan and Lease Losses	ALLOWANCE FOR LOAN AND LEASE LOSSES
	Activity in the allowance for loan and lease losses is as follows:
		Non-PCI			PCI				Total
	(dollars in thousands)
	Balance at December 31, 2011	$	180,883		$	89,261			$	270,144
	Provision for loan and lease losses	42,046			100,839				142,885
	Loans and leases charged off	(50,208		)	(50,270		)		(100,478		)
	Loans and leases recovered	6,325			142				6,467
	Net charge-offs	(43,883		)	(50,128		)		(94,011		)
	Balance at December 31, 2012	179,046			139,972				319,018
	Reclassification (1)	7,368			—				7,368
	Provision (credit) for loan and lease losses	19,289			(51,544		)		(32,255		)
	Loans and leases charged off	(33,118		)	(34,908		)		(68,026		)
	Loans and leases recovered	7,289			—				7,289
	Net charge-offs	(25,829		)	(34,908		)		(60,737		)
	Balance at December 31, 2013	179,874			53,520				233,394
	Provision (credit) for loan and lease losses	15,260			(14,620		)		640
	Loans and leases charged off	(20,499		)	(17,271		)		(37,770		)
	Loans and leases recovered	8,202			—				8,202
	Net charge-offs	(12,297		)	(17,271		)		(29,568		)
	Balance at December 31, 2014	$	182,837		$	21,629			$	204,466
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	Activity in the allowance for loan and lease losses, ending balances of loans and leases and related allowance by class of loans is summarized as follows:
		For the twelve months ended December 31, 2014, 2013, and 2012
		Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Non-			Total
		and land			mortgage				commercial				and				financing						mortgage			mortgage			and land						specific
		development							real estate				industrial																development
		- commercial																											- non-
																													commercial
	(Dollars in thousands)
	Non-PCI Loans
	Allowance for loan and lease losses:
	Balance at January 1, 2012	$	5,467		$	67,486			$	2,169			$	23,723			$	3,288		$	1,315		$	8,879		$	27,045		$	1,427		$	25,962		$	14,122		$	180,883
	Provision (credits)	9,665			18,198				130				(4,982		)		498			(116		)	(782		)	8,783			1,161			7,763			1,728			42,046
	Charge-offs	(9,546		)	(7,081		)		(254		)		(5,472		)		(361		)	(28		)	(4,790		)	(11,341		)	(1,047		)	(10,288		)	—			(50,208		)
	Recoveries	445			1,626				14				781				96			4			529			698			180			1,952			—			6,325
	Balance at December 31, 2012	6,031			80,229				2,059				14,050				3,521			1,175			3,836			25,185			1,721			25,389			15,850			179,046
	Reclassification (1)	5,141			27,421				(815		)		7,551				(253		)	(1,288		)	5,717			(9,838		)	(478		)	(10,018		)	(15,772		)	7,368
	Provision (credits)	2,809			(4,485		)		(32		)		4,333				1,646			308			2,786			6,296			(379		)	6,085			(78		)	19,289
	Charge-offs	(4,685		)	(3,904		)		(312		)		(4,785		)		(272		)	(6		)	(2,387		)	(6,064		)	(392		)	(10,311		)	—			(33,118		)
	Recoveries	1,039			996				109				1,213				107			1			559			660			209			2,396			—			7,289
	Balance at December 31, 2013	10,335			100,257				1,009				22,362				4,749			190			10,511			16,239			681			13,541			—			179,874
	Provision (credits)	1,735			(16,746		)		(401		)		10,441				(473		)	3,007			1,219			6,301			245			9,932			—			15,260
	Charge-offs	(316		)	(1,147		)		—				(3,014		)		(100		)	(13		)	(1,260		)	(4,744		)	(118		)	(9,787		)	—			(20,499		)
	Recoveries	207			2,825				124				938				110			—			191			854			84			2,869			—			8,202
	Balance at December 31, 2014	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	—		$	182,837
	(1) Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.
	The commercial mortgage loan class had a net credit provision of $16.7 million for the year ended December 31, 2014 compared to a net credit provision of $4.5 million for the year ended December 31, 2013. The increase in the net credit provision was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The provision expense for commercial and industrial loans totaled $10.4 million for the year ended December 31, 2014 compared to $4.3 million for the year ended December 31, 2013. Loan growth of $907.8 million during the year was the primary result of the increase in provision expense.
	The provision for lease financing was a net credit of $0.5 million for the year ended December 31, 2014 compared to a provision expense of $1.6 million for the year ended December 31, 2013. The decrease was primarily the result of continued improvements in the credit risk rating mix and lower credit default trends within this loan class.
	The other loan class had a provision expense of $3.0 million for the year ended December 31, 2014 compared to a provision expense of $0.3 million for the year ended December 31, 2013. The increase in the provision expense was attributable to newly originated loans as well as declining trends in credit risk ratings and defaults.
		December 31, 2014
	(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
		and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
		development							real estate																				development
		- commercial																											- non-commercial
	Non-PCI Loans
	Allowance for loan and lease losses:
	ALLL for loans and leases individually evaluated for impairment	$	92		$	8,610			$	112			$	1,743			$	150		$	1,972		$	1,360		$	1,052		$	71		$	555		$	15,717
	ALLL for loans and leases collectively evaluated for impairment	11,869			76,579				620				28,984				4,136			1,212			9,301			17,598			821			16,000			167,120
	Total allowance for loan and lease losses	$	11,961		$	85,189			$	732			$	30,727			$	4,286		$	3,184		$	10,661		$	18,650		$	892		$	16,555		$	182,837
	Loans and leases:
	Loans and leases individually evaluated for impairment	$	1,620		$	82,803			$	584			$	11,040			$	623		$	2,000		$	14,913		$	3,675		$	1,340		$	995		$	119,593
	Loans and leases collectively evaluated for impairment	548,948			7,470,145				244,291				1,977,894				571,293			351,833			2,505,629			2,558,125			118,757			1,116,459			17,463,374
Total loan and leases	$	550,568		$	7,552,948			$	244,875			$	1,988,934			$	571,916		$	353,833		$	2,520,542		$	2,561,800		$	120,097		$	1,117,454		$	17,582,967
	December 31, 2013
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Other			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and industrial				financing						mortgage			mortgage			and land
	development							real estate																				development
	- commercial																											- non-commercial
Non-PCI Loans
Allowance for loan and lease losses:
ALLL for loans and leases individually evaluated for impairment	$	103		$	6,873			$	209			$	771			$	54		$	—		$	1,586		$	372		$	72		$	121		$	10,161
ALLL for loans and leases collectively evaluated for impairment	$	10,232		$	93,384			$	800			$	21,591			$	4,695		$	190		$	8,925		$	15,867		$	609		$	13,420		$	169,713
Total allowance for loan and lease losses	$	10,335		$	100,257			$	1,009			$	22,362			$	4,749		$	190		$	10,511		$	16,239		$	681		$	13,541		$	179,874
Loans and leases:
Loans and leases individually evaluated for impairment	$	2,272		$	97,111			$	1,878			$	9,300			$	188		$	—		$	15,539		$	3,596		$	1,108		$	1,154		$	132,146
Loans and leases collectively evaluated for impairment	317,575			6,265,379				176,876				1,071,858				381,575			175,336			966,882			2,109,689			121,684			385,298			11,972,152
Total loan and leases	$	319,847		$	6,362,490			$	178,754			$	1,081,158			$	381,763		$	175,336		$	982,421		$	2,113,285		$	122,792		$	386,452		$	12,104,298
In the non-PCI commercial mortgage segment, loans and leases individually evaluated for impairment decreased $14.3 million to $82.8 million as of December 31, 2014 due to credit quality improvement as certain loans were no longer considered impaired during 2014 and fewer loans were identified for impairment. Reserves on impaired commercial mortgage loans increased $1.7 million due to cash flow deterioration on various individual large relationships.
Other loans and leases individually evaluated for impairment increased $2.0 million as of December 31, 2014 primarily due to one lending relationship which was almost fully reserved due to the loan being placed on nonaccrual status and being unsecured.
Non-PCI loans and leases individually evaluated for impairment decreased $12.6 million to $119.6 million at December 31, 2014 in comparison to December 31, 2013 due to continued credit quality improvements, primarily in the commercial mortgage portfolio. In contrast, Non-PCI loans and leases collectively evaluated for impairment increased $5.49 billion from December 31, 2013 to December 31, 2014. This increase is driven by the addition of non-PCI loans acquired in the Bancorporation merger of $4.18 billion as of the acquisition date and originated loan growth.
	For the twelve months ended December 31, 2014, 2013, and 2012
(Dollars in thousands)	Construction			Commercial				Other				Commercial				Lease			Residential			Revolving			Construction			Consumer			Total
	and land			mortgage				commercial				and				financing			mortgage			mortgage			and land			and other
	development -							real estate				industrial													development -
	commercial																								noncommercial
PCI Loans
Allowance for loan and lease losses:
Balance at January 1, 2012	$	16,693		$	39,557			$	16,862			$	5,500			$	13		$	5,433		$	77		$	4,652		$	474		$	89,261
Provision (credits)	23,160			34,227				(4,372		)		11,839				(13		)	18,401			10,796			6,520			281			100,839
Charge-offs	(8,667		)	(23,509		)		(1,256		)		(8,442		)		—			(4,139		)	(1,119		)	(2,885		)	(253		)	(50,270		)
Recoveries	—			—				—				—				—			142			—			—			—			142
Balance at December 31, 2012	31,186			50,275				11,234				8,897				—			19,837			9,754			8,287			502			139,972
Provision (credits)	(22,942		)	(3,872		)		(8,949		)		470				—			(5,487		)	(6,399		)	(4,170		)	(195		)	(51,544		)
Charge-offs	(6,924		)	(16,497		)		(931		)		(4,092		)		—			(2,548		)	(396		)	(3,435		)	(85		)	(34,908		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2013	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Provision (credits)	1,284			(7,903		)		(1,385		)		(2,023		)		—			(5,576		)	1,523			(395		)	(145		)	(14,620		)
Charge-offs	(2,454		)	(11,868		)		106				(2,012		)		—			(406		)	(483		)	(104		)	(50		)	(17,271		)
Recoveries	—			—				—				—				—			—			—			—			—			—
Balance at December 31, 2014	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
December 31, 2014
ALLL for loans and leases acquired with deteriorated credit quality	$	150		$	10,135			$	75			$	1,240			$	—		$	5,820		$	3,999		$	183		$	27		$	21,629
Loans and leases acquired with deteriorated credit quality	78,079			577,518				40,193				27,254				—			382,339			74,109			912			6,094			1,186,498
December 31, 2013
ALLL for loans and leases acquired with deteriorated credit quality	1,320			29,906				1,354				5,275				—			11,802			2,959			682			222			53,520
Loans and leases acquired with deteriorated credit quality	78,915			642,891				41,381				17,254				—			213,851			30,834			2,583			1,717			1,029,426
At December 31, 2014 and December 31, 2013, $285.6 million and $459.9 million, respectively, in PCI loans experienced an adverse change in expected cash flows since the date of acquisition.
The following tables provide information on non-PCI impaired loans and leases, exclusive of loans and leases evaluated collectively as a homogeneous group, including interest income recognized in the period during which the loans and leases were considered impaired.
	December 31, 2014
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	996		$	624			$	1,620			$	6,945			$	92
Commercial mortgage	57,324			25,479				82,803				87,702				8,610
Other commercial real estate	112			472				584				913				112
Commercial and industrial	10,319			721				11,040				12,197				1,743
Lease financing	319			304				623				623				150
Other	2,000			—				2,000				2,000				1,972
Residential mortgage	10,198			4,715				14,913				15,746				1,360
Revolving mortgage	3,675			—				3,675				4,933				1,052
Construction and land development - noncommercial	1,077			263				1,340				1,340				71
Consumer	987			8				995				1,067				555
Total non-PCI impaired loans and leases	$	87,007		$	32,586			$	119,593			$	133,466			$	15,717
	December 31, 2013
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	1,025		$	1,247			$	2,272			$	7,306			$	103
Commercial mortgage	57,819			39,292				97,111				103,522				6,873
Other commercial real estate	783			1,095				1,878				2,279				209
Commercial and industrial	7,197			2,103				9,300				10,393				771
Lease financing	133			55				188				188				54
Residential mortgage	11,534			4,005				15,539				15,939				1,586
Revolving mortgage	3,382			214				3,596				3,596				372
Construction and land development - noncommercial	651			457				1,108				1,108				72
Consumer	1,154			—				1,154				1,154				121
Total non-PCI impaired loans and leases	$	83,678		$	48,468			$	132,146			$	145,485			$	10,161
The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2014, 2013 and 2012:
	Year ended December 31, 2014
(Dollars in thousands)	YTD			YTD Interest Income Recognized
	Average
	Balance
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	1,689		$	83
Commercial mortgage	86,250			3,698
Other commercial real estate	2,125			80
Commercial and industrial	13,433			580
Lease financing	774			44
Other	528			29
Residential mortgage	15,487			593
Revolving mortgage	3,922			134
Construction and land development - noncommercial	1,678			98
Consumer	1,535			88
Total non-PCI impaired loans and leases	$	127,421		$	5,427
	Year ended December 31, 2013
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	6,414		$	270
Commercial mortgage	105,628			5,702
Other commercial real estate	2,658			144
Commercial and industrial	12,772			642
Lease financing	350			22
Other	—			—
Residential mortgage	15,470			444
Revolving mortgage	5,653			485
Construction and land development - noncommercial	958			55
Consumer	1,427			53
Total non-PCI impaired loans and leases	$	151,330		$	7,817
	Year ended December 31, 2012
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	22,493		$	399
Commercial mortgage	96,082			4,630
Other commercial real estate	2,690			142
Commercial and industrial	13,658			788
Lease financing	497			37
Other	424			23
Residential mortgage	14,951			586
Revolving mortgage	2,931			68
Construction and land development - noncommercial	2,850			41
Consumer	1,850			21
Total non-PCI impaired loans and leases	$	158,426		$	6,735
Troubled Debt Restructurings
BancShares accounts for certain loan modifications or restructurings as TDRs. In general, the modification or restructuring of a loan is considered a TDR if, for economic reasons or legal reasons related to a borrower's financial difficulties, a concession is granted to the borrower that creditors would not otherwise consider. Concessions may relate to the contractual interest rate, maturity date, payment structure or other actions. In accordance with GAAP, loans acquired under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, excluding pooled loans, are not initially considered to be TDRs, but can be classified as such if a modification is made subsequent to acquisition. Subsequent modification of a PCI loan accounted for in a pool that would otherwise meet the definition of a TDR is not reported, or accounted for, as a TDR since pooled PCI loans are excluded from the scope of TDR accounting.
The following table provides a summary of total TDRs by accrual status.
	December 31, 2014											December 31, 2013
(Dollars in thousands)	Accruing			Nonaccruing				Total				Accruing				Nonaccruing			Total
Commercial loans
Construction and land development - commercial	$	2,591		$	446			$	3,037			$	21,032			$	1,002		$	22,034
Commercial mortgage	92,184			8,937				101,121				113,323				23,387			136,710
Other commercial real estate	2,374			449				2,823				3,470				1,150			4,620
Commercial and industrial	9,864			664				10,528				9,838				1,142			10,980
Lease	258			365				623				49				—			49
Other	34			—				34				—				—			—
Total commercial loans	107,305			10,861				118,166				147,712				26,681			174,393
Noncommercial
Residential	22,597			4,655				27,252				23,343				3,663			27,006
Revolving mortgage	3,675			—				3,675				3,095				—			3,095
Construction and land development - noncommercial	1,391			—				1,391				651				457			1,108
Consumer and other	995			—				995				1,154				—			1,154
Total noncommercial loans	28,658			4,655				33,313				28,243				4,120			32,363
Total loans	$	135,963		$	15,516			$	151,479			$	175,955			$	30,801		$	206,756
Total troubled debt restructurings at December 31, 2014, equaled $151.5 million, of which $46.9 million were PCI and $104.6 million were non-PCI. TDRs at December 31, 2013, totaled $206.8 million, which consisted of $102.3 million PCI and $104.4 million non-PCI.
The majority of TDRs are included in the special mention, substandard or doubtful grading categories, which results in more elevated loss expectations when determining the expected cash flows that are used to determine the allowance for loan losses associated with these loans. When a restructured loan subsequently defaults, it is evaluated and downgraded if appropriate. The more severely graded the loan, the lower the estimated expected cash flows and the greater the allowance recorded. Further, TDRs over $500,000 and graded substandard or lower are evaluated individually for impairment through a review of collateral values.
.
The following tables provide the types of TDRs made during the twelve months ended December 31, 2014, and 2013, as well as a summary of loans that were modified as a TDR during the 12 months ended December 31, 2014, and 2013 that subsequently defaulted during the
twelve months ended December 31, 2014, and 2013. BancShares defines payment default as movement of the TDR to nonaccrual status, which is generally 90 days past due for TDRs, foreclosure or charge-off, whichever occurs first.
	Year ended December 31, 2014									Year ended December 31, 2013
	All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
	Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
(Dollars in thousands)
Non-PCI loans and leases
Interest only period provided
Commercial mortgage	6	$	1,973		2	$	364			6	$	1,520			1	$	—
Commercial and industrial	3	250			—	—				2	397				—	—
Lease financing	2	118			—	—				—	—				—	—
Other commercial real estate	—	—			—	—				1	—				—	—
Residential mortgage	—	—			—	—				1	630				—	—
Other	1	34			—	—				—	—				—	—
Total interest only	12	2,375			2	364				10	2,547				1	—
Loan term extension
Construction and land development - commercial	2	187			—	—				—	—				—	—
Commercial mortgage	18	4,848			—	—				9	3,270				—	—
Commercial and industrial	5	2,274			—	—				1	47				—	—
Lease financing	6	198			—	—				—	—				—	—
Residential mortgage	19	572			—	—				11	539				—	—
Construction and land development - noncommercial	7	226			—	—				—	—				—	—
Consumer	6	99			1	—				2	62				—	—
Total loan term extension	63	8,404			1	—				23	3,918				—	—
Below market interest rate
Construction and land development - commercial	11	372			—	—				3	609				—	—
Commercial mortgage	44	12,642			3	441				28	10,873				1	295
Commercial and industrial	13	751			—	—				3	851				—	—
Other commercial real estate	1	337			—	—				2	378				—	—
Residential mortgage	41	2,444			1	45				21	1,235				—	—
Revolving mortgage	5	217			—	—				13	801				3	451
Construction & land development - noncommercial	12	389			—	—				4	269				—	—
Consumer	10	193			—	—				3	219				—	—
Total below market interest rate	137	17,345			4	486				77	15,235				4	746
Discharged from bankruptcy
Commercial mortgage	2	949			1	—				—	—				—	—
Residential mortgage	12	1,067			2	268				7	510				2	60
Revolving mortgage	17	663			1	—				31	2,577				6	274
Construction & land development - noncommercial	1	62			1	62				—	—				—	—
Consumer	4	4			—	—				—	—				—	—
Total discharged from bankruptcy	36	2,745			5	330				38	3,087				8	334
Total non-PCI restructurings	248	$	30,869		12	$	1,180			148	$	24,787			13	$	1,080
	Year ended December 31, 2014									Year ended December 31, 2013
	All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
	Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
(Dollars in thousands)
PCI loans
Interest only period provided
Construction and land development - commercial	—	$	—		—	$	—			1	$	2,590			1	$	2,590
Commercial mortgage	2	—			2	—				5	2,880				1	299
Commercial and industrial	—	—			—	—				1	21				—	—
Residential mortgage	—	—			—	—				1	39				—	—
Total interest only	2	—			2	—				8	5,530				2	2,889
Loan term extension
Construction and land development - commercial	1	332			—	—				6	2,247				—	—
Commercial mortgage	—	—			—	—				1	157				1	157
Commercial and industrial	—	—			—	—				2	1,080				—	—
Residential mortgage	2	317			5	53				3	5,153				2	5,120
Construction and land development - noncommercial	1	51			—	—				—	—				—	—
Total loan term extension	4	700			5	53				12	8,637				3	5,277
Below market interest rate
Construction and land development - commercial	2	116			—	—				2	106				—	—
Commercial mortgage	16	5,783			3	138				12	7,513				4	2,418
Commercial and industrial	—	—			—	—				2	493				—	—
Residential mortgage	29	3,948			3	23				10	2,088				5	1,475
Total below market interest rate	47	9,847			6	161				26	10,200				9	3,893
Discharged from bankruptcy
Residential mortgage	26	1,659			2	—				—	—				—	—
Total discharged from bankruptcy	26	1,659			2	—				—	—				—	—
Other concession
Commercial mortgage	—	—			—	—				1	110				—	—
Total other concession	—	—			—	—				1	110				—	—
Total PCI restructurings	79	$	12,206		15	$	214			47	$	24,477			14	$	12,059
The following tables provide information on non-PCI impaired loans and leases, exclusive of loans and leases evaluated collectively as a homogeneous group, including interest income recognized in the period during which the loans and leases were considered impaired.
	December 31, 2014
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	996		$	624			$	1,620			$	6,945			$	92
Commercial mortgage	57,324			25,479				82,803				87,702				8,610
Other commercial real estate	112			472				584				913				112
Commercial and industrial	10,319			721				11,040				12,197				1,743
Lease financing	319			304				623				623				150
Other	2,000			—				2,000				2,000				1,972
Residential mortgage	10,198			4,715				14,913				15,746				1,360
Revolving mortgage	3,675			—				3,675				4,933				1,052
Construction and land development - noncommercial	1,077			263				1,340				1,340				71
Consumer	987			8				995				1,067				555
Total non-PCI impaired loans and leases	$	87,007		$	32,586			$	119,593			$	133,466			$	15,717
	December 31, 2013
(Dollars in thousands)	With a			With no				Total				Unpaid				Related
	recorded			recorded								principal				allowance
	allowance			allowance								balance				recorded
Non-PCI impaired loans and leases
Construction and land development - commercial	$	1,025		$	1,247			$	2,272			$	7,306			$	103
Commercial mortgage	57,819			39,292				97,111				103,522				6,873
Other commercial real estate	783			1,095				1,878				2,279				209
Commercial and industrial	7,197			2,103				9,300				10,393				771
Lease financing	133			55				188				188				54
Residential mortgage	11,534			4,005				15,539				15,939				1,586
Revolving mortgage	3,382			214				3,596				3,596				372
Construction and land development - noncommercial	651			457				1,108				1,108				72
Consumer	1,154			—				1,154				1,154				121
Total non-PCI impaired loans and leases	$	83,678		$	48,468			$	132,146			$	145,485			$	10,161
The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2014, 2013 and 2012:
	Year ended December 31, 2014
(Dollars in thousands)	YTD			YTD Interest Income Recognized
	Average
	Balance
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	1,689		$	83
Commercial mortgage	86,250			3,698
Other commercial real estate	2,125			80
Commercial and industrial	13,433			580
Lease financing	774			44
Other	528			29
Residential mortgage	15,487			593
Revolving mortgage	3,922			134
Construction and land development - noncommercial	1,678			98
Consumer	1,535			88
Total non-PCI impaired loans and leases	$	127,421		$	5,427
	Year ended December 31, 2013
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	6,414		$	270
Commercial mortgage	105,628			5,702
Other commercial real estate	2,658			144
Commercial and industrial	12,772			642
Lease financing	350			22
Other	—			—
Residential mortgage	15,470			444
Revolving mortgage	5,653			485
Construction and land development - noncommercial	958			55
Consumer	1,427			53
Total non-PCI impaired loans and leases	$	151,330		$	7,817
	Year ended December 31, 2012
Non-PCI impaired loans and leases:
Construction and land development - commercial	$	22,493		$	399
Commercial mortgage	96,082			4,630
Other commercial real estate	2,690			142
Commercial and industrial	13,658			788
Lease financing	497			37
Other	424			23
Residential mortgage	14,951			586
Revolving mortgage	2,931			68
Construction and land development - noncommercial	2,850			41
Consumer	1,850			21
Total non-PCI impaired loans and leases	$	158,426		$	6,735
Troubled Debt Restructuring, Summary of Accrual Status [Table Text Block]	Subsequent modification of a PCI loan accounted for in a pool that would otherwise meet the definition of a TDR is not reported, or accounted for, as a TDR since pooled PCI loans are excluded from the scope of TDR accounting.
	The following table provides a summary of total TDRs by accrual status.
		December 31, 2014											December 31, 2013
	(Dollars in thousands)	Accruing			Nonaccruing				Total				Accruing				Nonaccruing			Total
	Commercial loans
	Construction and land development - commercial	$	2,591		$	446			$	3,037			$	21,032			$	1,002		$	22,034
	Commercial mortgage	92,184			8,937				101,121				113,323				23,387			136,710
	Other commercial real estate	2,374			449				2,823				3,470				1,150			4,620
	Commercial and industrial	9,864			664				10,528				9,838				1,142			10,980
	Lease	258			365				623				49				—			49
	Other	34			—				34				—				—			—
	Total commercial loans	107,305			10,861				118,166				147,712				26,681			174,393
	Noncommercial
	Residential	22,597			4,655				27,252				23,343				3,663			27,006
	Revolving mortgage	3,675			—				3,675				3,095				—			3,095
	Construction and land development - noncommercial	1,391			—				1,391				651				457			1,108
	Consumer and other	995			—				995				1,154				—			1,154
	Total noncommercial loans	28,658			4,655				33,313				28,243				4,120			32,363
	Total loans	$	135,963		$	15,516			$	151,479			$	175,955			$	30,801		$	206,756
Troubled Debt Restructurings on Financing Receivables	.
	The following tables provide the types of TDRs made during the twelve months ended December 31, 2014, and 2013, as well as a summary of loans that were modified as a TDR during the 12 months ended December 31, 2014, and 2013 that subsequently defaulted during the
	twelve months ended December 31, 2014, and 2013. BancShares defines payment default as movement of the TDR to nonaccrual status, which is generally 90 days past due for TDRs, foreclosure or charge-off, whichever occurs first.
		Year ended December 31, 2014									Year ended December 31, 2013
		All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
		Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
	(Dollars in thousands)
	Non-PCI loans and leases
	Interest only period provided
	Commercial mortgage	6	$	1,973		2	$	364			6	$	1,520			1	$	—
	Commercial and industrial	3	250			—	—				2	397				—	—
	Lease financing	2	118			—	—				—	—				—	—
	Other commercial real estate	—	—			—	—				1	—				—	—
	Residential mortgage	—	—			—	—				1	630				—	—
	Other	1	34			—	—				—	—				—	—
	Total interest only	12	2,375			2	364				10	2,547				1	—
	Loan term extension
	Construction and land development - commercial	2	187			—	—				—	—				—	—
	Commercial mortgage	18	4,848			—	—				9	3,270				—	—
	Commercial and industrial	5	2,274			—	—				1	47				—	—
	Lease financing	6	198			—	—				—	—				—	—
	Residential mortgage	19	572			—	—				11	539				—	—
	Construction and land development - noncommercial	7	226			—	—				—	—				—	—
	Consumer	6	99			1	—				2	62				—	—
	Total loan term extension	63	8,404			1	—				23	3,918				—	—
	Below market interest rate
	Construction and land development - commercial	11	372			—	—				3	609				—	—
	Commercial mortgage	44	12,642			3	441				28	10,873				1	295
	Commercial and industrial	13	751			—	—				3	851				—	—
	Other commercial real estate	1	337			—	—				2	378				—	—
	Residential mortgage	41	2,444			1	45				21	1,235				—	—
	Revolving mortgage	5	217			—	—				13	801				3	451
	Construction & land development - noncommercial	12	389			—	—				4	269				—	—
	Consumer	10	193			—	—				3	219				—	—
	Total below market interest rate	137	17,345			4	486				77	15,235				4	746
	Discharged from bankruptcy
	Commercial mortgage	2	949			1	—				—	—				—	—
	Residential mortgage	12	1,067			2	268				7	510				2	60
	Revolving mortgage	17	663			1	—				31	2,577				6	274
	Construction & land development - noncommercial	1	62			1	62				—	—				—	—
	Consumer	4	4			—	—				—	—				—	—
	Total discharged from bankruptcy	36	2,745			5	330				38	3,087				8	334
	Total non-PCI restructurings	248	$	30,869		12	$	1,180			148	$	24,787			13	$	1,080
		Year ended December 31, 2014									Year ended December 31, 2013
		All restructurings				Restructurings with payment default					All restructurings					Restructurings with payment default
		Number of Loans	Recorded investment at period end			Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end				Number of Loans	Recorded investment at period end
	(Dollars in thousands)
	PCI loans
	Interest only period provided
	Construction and land development - commercial	—	$	—		—	$	—			1	$	2,590			1	$	2,590
	Commercial mortgage	2	—			2	—				5	2,880				1	299
	Commercial and industrial	—	—			—	—				1	21				—	—
	Residential mortgage	—	—			—	—				1	39				—	—
	Total interest only	2	—			2	—				8	5,530				2	2,889
	Loan term extension
	Construction and land development - commercial	1	332			—	—				6	2,247				—	—
	Commercial mortgage	—	—			—	—				1	157				1	157
	Commercial and industrial	—	—			—	—				2	1,080				—	—
	Residential mortgage	2	317			5	53				3	5,153				2	5,120
	Construction and land development - noncommercial	1	51			—	—				—	—				—	—
	Total loan term extension	4	700			5	53				12	8,637				3	5,277
	Below market interest rate
	Construction and land development - commercial	2	116			—	—				2	106				—	—
	Commercial mortgage	16	5,783			3	138				12	7,513				4	2,418
Commercial and industrial	—	—			—	—				2	493				—	—
Residential mortgage	29	3,948			3	23				10	2,088				5	1,475
Total below market interest rate	47	9,847			6	161				26	10,200				9	3,893
Discharged from bankruptcy
Residential mortgage	26	1,659			2	—				—	—				—	—
Total discharged from bankruptcy	26	1,659			2	—				—	—				—	—
Other concession
Commercial mortgage	—	—			—	—				1	110				—	—
Total other concession	—	—			—	—				1	110				—	—
Total PCI restructurings	79	$	12,206		15	$	214			47	$	24,477			14	$	12,059

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises and Equipment	Major classifications of premises and equipment at December 31, 2014 and 2013 are summarized as follows:
	(Dollars in thousands)	2014		2013
	Land	$	295,090	$	204,259
	Premises and leasehold improvements	1,045,718		875,511
	Furniture and equipment	444,774		394,348
	Total	1,785,582		1,474,118
	Less accumulated depreciation and amortization	660,501		597,596
	Total premises and equipment	$	1,125,081	$	876,522
Future Minimum Rental Payments for Operating Leases	Future minimum rental commitments for noncancellable operating leases with initial or remaining terms of one or more years consisted of the following at December 31, 2014:
	(Dollars in thousands)	Year ended December 31
	2015	$	16,834
	2016	11,598
	2017	8,463
	2018	6,274
	2019	4,445
	Thereafter	40,112
	Total minimum payments	$	87,726

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Changes in Other Real Estate Owned	The following table explains changes in other real estate owned during 2014 and 2013.
	(Dollars in thousands)	Covered			Noncovered			Total
	Balance at January 1, 2013	$	102,577		$	43,513		$	146,090
	Additions	59,034			33,908			92,942
	Sales	(96,744		)	(36,168		)	(132,912		)
	Writedowns	(17,786		)	(4,355		)	(22,141		)
	Balance at December 31, 2013	47,081			36,898			83,979
	Additions	29,708			36,574			66,282
	Additions acquired in the Bancorporation merger (1)	1,336			34,008			35,344
	Additions acquired in the 1st Financial merger (1)	—			11,591			11,591
	Sales	(38,753		)	(48,935		)	(87,688		)
	Writedowns	(10,853		)	(5,219		)	(16,072		)
	Transfers (2)	$	(5,537	)	$	5,537		$	—
	Balance at December 31, 2014	$	22,982		$	70,454		$	93,436
	(1) These additions relate to the mergers with 1st Financial Services Corporation and First Citizens Bancorporation, Inc. See Note B, "Business Combinations," for a further description.
	(2) Transfers include OREO balances associated with expired loss share agreements.

Receivable_from_FDIC_for_Loss_1

Receivable from FDIC for Loss Share Agreements (Tables)	12 Months Ended
	Dec. 31, 2014
Receivable From FDIC For Loss Share Agreements [Abstract]
Changes in Receivable From FDIC	The following table provides changes in the receivable from the FDIC for the years ended December 31, 2014, 2013 and 2012:
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	Balance at January 1	$	93,397		$	270,192		$	617,377
	Additional receivable from Bancorporation acquisition	5,106			—			—
	Amortization	(43,422		)	(85,651		)	(102,394		)
	Cash payments to (from) the FDIC	1,286			(19,373		)	(251,972		)
	Post-acquisition adjustments	(27,666		)	(71,771		)	7,181
	Balance at December 31	$	28,701		$	93,397		$	270,192

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	Deposits at December 31 are summarized as follows:
	(Dollars in thousands)	2014		2013
	Demand	$	8,086,784	$	5,241,817
	Checking with interest	4,560,565		2,445,972
	Money market accounts	8,319,569		6,306,942
	Savings	1,204,514		1,004,097
	Time	3,507,145		2,875,238
	Total deposits	$	25,678,577	$	17,874,066
Maturities Of Time Deposits	At December 31, 2014, the scheduled maturities of time deposits were:
	(Dollars in thousands)	Year ended December 31
	2015	$	2,423,786
	2016	701,043
	2017	241,437
	2018	96,949
	2019	43,930
	Thereafter	—
	Total time deposits	$	3,507,145

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Short-term Debt [Abstract]
Schedule of Short-term Debt	Short-term borrowings at December 31 are as follows:
	(Dollars in thousands)	2014		2013
	Master notes	$	410,258	$	411,907
	Repurchase agreements	294,426		96,960
	Notes payable to Federal Home Loan Banks	80,000		—
	Federal funds purchased	2,551		2,551
	Subordinated notes payable	199,949		—
	Total short-term borrowings	$	987,184	$	511,418

LongTerm_Obligations_Tables

Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
LONG-TERM OBLIGATIONS [Abstract]
Schedule of Long-term Debt Instruments	Long-term obligations at December 31 include:
	(Dollars in thousands)	2014			2013
	Junior subordinated debenture at 3-month LIBOR plus 1.75 percent maturing June 30, 2036	$	96,392		$	96,392
	Junior subordinated debenture at 3-month LIBOR plus 2.25 percent maturing June 15, 2034	26,547			—
	Junior subordinated debenture at 3-month LIBOR plus 2.85 percent maturing April 7, 2034	10,000			—
	Subordinated notes payable at 5.125 percent maturing June 1, 2015	—			125,000
	Subordinated notes payable 8.00 percent June 1, 2018	15,000			—
	Obligations under capitalized leases extending to July 2026	3,150			6,515
	Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through September 2021	160,268			240,283
	Note payable to the Federal Home Loan Bank of Seattle with a rate of 4.74 percent and a maturity date of July 2017	10,000			10,000
	Unamortized purchase accounting adjustments	(156		)	2,449
	Other long-term debt	30,119			30,130
	Total long-term obligations	$	351,320		$	510,769
Schedule of Maturities of Long-term Debt	Long-term obligations maturing in each of the five years subsequent to December 31, 2014 and thereafter, include:
		Year ended December 31
	2015	$	147
	2016	—
	2017	10,725
	2018	136,104
	2019	—
	Thereafter	204,344
	Total long-term obligations	$	351,320

Estimated_Fair_Values_Tables

Estimated Fair Values (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Estimated Fair Values For Certain Financial Assets And Financial Liabilities	For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of December 31, 2014 and December 31, 2013. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short term in nature and there is no interest rate or credit risk relating to them that would cause the fair value to differ from the carrying value.
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Carrying value			Fair value			Carrying value		Fair value
	Cash and due from banks	$	604,182		$	604,182		$	533,599	$	533,599
	Overnight investments	1,724,919			1,724,919			859,324		859,324
	Investment securities available for sale	7,171,917			7,171,917			5,387,703		5,387,703
	Investment securities held to maturity	518			544			907		974
	Loans held for sale	63,696			63,696			47,271		47,956
	Net loans and leases	18,564,999			18,046,497			12,900,330		12,545,537
	Receivable from the FDIC for loss share agreements (1)	28,701			18,218			93,397		38,438
	Income earned not collected	57,254			57,254			48,390		48,390
	Federal Home Loan Bank stock	39,113			39,113			40,819		40,819
	Preferred stock and other acquired financial assets	13,689			14,708			33,564		34,786
	Mortgage servicing rights	16,688			16,736			16		16
	Deposits	25,678,577			25,164,683			17,874,066		17,898,570
	Short-term borrowings	987,184			987,184			511,418		511,418
	Long-term obligations	351,320			367,732			510,769		526,037
	Payable to the FDIC for loss share agreements	116,535			122,168			109,378		111,941
	Accrued interest payable	8,194			8,194			6,737		6,737
	Interest rate swap	4,337			4,337			7,220		7,220
	(1) The fair value of the FDIC receivable excludes receivable related to accretable yield to be amortized in prospective periods.
Assets And Liabilities Carried At Fair Value On A Recurring Basis	Among BancShares’ assets and liabilities, investment securities available for sale, loans held for sale at December 31, 2014 and interest ra
Fair Value Option	The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for residential real estate loans held for sale measured at fair value as of December 31, 2014.
		December 31, 2014
	(Dollars in thousands)	Fair Value			Aggregate Unpaid Principal Balance			Difference
	Loans held for sale	$	63,696		$	62,996		$	700
	No loans held for sell were 90 or more days past due or on nonaccrual status as of December 31, 2014.
	The changes in fair value for residential real estate loans held for sale for which we elected the fair value option are included in the table below for the year ended December 31, 2014.
		Year ended December 31, 2014
	(Dollars in thousands)	Gains(Losses) From Fair Value Changes
	Loans held for sale	$	202
Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis	For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of December 31, 2014 and December 31, 2013.
		December 31, 2014
				Fair value measurements using:
	(Dollars in thousands)	Fair value		Level 1			Level 2		Level 3
	Impaired loans	73,170		—			—		73,170
	Other real estate not covered under loss share agreements remeasured during current year	40,714		—			—		40,714
	Other real estate covered under loss share agreements remeasured during current year	17,664		—			—		17,664
	Mortgage servicing rights	13,562		—			—		13,562
		December 31, 2013
				Fair value measurements using:
		Fair value		Level 1			Level 2		Level 3
	Impaired loans	77,817		—			—		77,817
	Other real estate not covered under loss share agreements remeasured during current year	20,526		—			—		20,526
	Other real estate covered under loss share agreements remeasured during current year	37,587		—			—		37,587

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) included the following as of December 31, 2014, and December 31, 2013:
		December 31, 2014											December 31, 2013
	(Dollars in thousands)	Accumulated				Deferred				Accumulated			Accumulated			Deferred				Accumulated
		other				tax				other			other			tax				other
		comprehensive				benefit				comprehensive			comprehensive			expense				comprehensive
		income (loss)								income (loss),			loss			(benefit)				loss,
										net of tax										net of tax
	Unrealized gains (losses) on investment securities available for sale	$	8,343			$	3,245			$	5,098		$	(16,632	)	$	(6,541	)		$	(10,091	)
	Unrealized loss on cash flow hedge	(4,337		)		(1,673		)		(2,664		)	(7,220		)	(2,786		)		(4,434		)
	Funded status of defined benefit plan	(90,696		)		(35,281		)		(55,415		)	(17,582		)	(6,839		)		(10,743		)
	Total	$	(86,690	)		$	(33,709	)		$	(52,981	)	$	(41,434	)	$	(16,166	)		$	(25,268	)
	The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2014, and December 31, 2013:
	(Dollars in thousands)	Unrealized gains and losses on available-for-sale securities(1)				Gains and losses on cash flow hedges(1)				Defined benefit pension items(1)			Total
	Balance at January 1, 2013	$	20,517			$	(6,292	)		$	(96,331	)	$	(82,106	)
	Other comprehensive income (loss) before reclassifications	(30,608		)		1,858				75,082			46,332
	Amounts reclassified from accumulated other comprehensive income (loss)	—				—				10,506			10,506
	Net current period other comprehensive income (loss)	(30,608		)		1,858				85,588			56,838
	Balance at December 31, 2013	(10,091		)		(4,434		)		(10,743		)	(25,268		)
	Other comprehensive income (loss) before reclassifications	(2,683		)		1,770				(47,946		)	(48,859		)
	Amounts reclassified from accumulated other comprehensive loss	17,872				—				3,274			21,146
	Net current period other comprehensive income (loss)	15,189				1,770				(44,672		)	(27,713		)
	Balance at December 31, 2014	$	5,098			$	(2,664	)		$	(55,415	)	$	(52,981	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
Schedule of Expected Benefit Payments
	Following are estimated payments to pension plan participants in the indicated periods for each plan:
	(Dollars in thousands)	BancShares Plan				Bancorporation Plan
	2015	$	19,648			$	5,270
	2016	21,412				5,594
	2017	23,133				6,088
	2018	24,767				6,679
	2019	26,381				7,045
	2020-2024	157,292				42,155
Deferred Benefit Plans Liability Rollforward	The following table provides the accrued liability as of December 31, 2014 and 2013, and the changes in the accrued liability during the years then ended:
	(Dollars in thousands)	2014				2013
	Present value of accrued liability as of January 1	$	23,960			$	25,851
	Benefits acquired in the 1st Financial merger	1,455				—
	Benefits acquired in the Bancorporation merger	10,288				—
	Benefit expense and interest cost	2,682				1,151
	Benefits paid	(2,431		)		(3,042		)
	Benefits forfeited	—				—
	Present value of accrued liability as of December 31	$	35,954			$	23,960
	Discount rate at December 31	4.27		%		4.9		%
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Funded Status	The following table provides the changes in benefit obligation and plan assets and the funded status of the plan at December 31, 2014 and 2013.
	(Dollars in thousands)	2014				2013
	Change in benefit obligation
	Projected benefit obligation at January 1	$	530,678			$	580,938
	Service cost	12,332				16,332
	Interest cost	25,615				23,686
	Actuarial (gain) loss	76,122				(74,060		)
	Benefits paid	(17,102		)		(16,218		)
	Projected benefit obligation at December 31	627,645				530,678
	Change in plan assets
	Fair value of plan assets at January 1	524,017				463,005
	Actual return on plan assets	38,041				77,230
	Employer contributions	—				—
	Benefits paid	(17,102		)		(16,218		)
	Fair value of plan assets at December 31	544,956				524,017
	Funded status at December 31	$	(82,689	)		$	(6,661	)
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets as of December 31, 2014 and 2013 consist of:
	(Dollars in thousands)	2014				2013
	Other assets	$	—			$	—
	Other liabilities	(82,689		)		(6,661		)
	Net asset (liability) recognized	$	(82,689	)		$	(6,661	)
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2014 and 2013.
	(Dollars in thousands)	2014				2013
	Net loss (gain)	$	80,806			$	16,605
	Less prior service cost	767				977
	Accumulated other comprehensive loss, excluding income taxes	$	81,573			$	17,582
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The following table provides expected amortization amounts for 2015.
	(Dollars in thousands)
	Actuarial loss	$	11,335
	Prior service cost	210
	Total	$	11,545
Schedule of Net Benefit Costs	The following table shows the components of periodic benefit cost related to the pension plan and changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2014, 2013 and 2012.
		Year ended December 31
	(Dollars in thousands)	2014				2013				2012
	Service cost	$	12,332			$	16,332			$	14,241
	Interest cost	25,615				23,686				23,711
	Expected return on assets	(31,269		)		(27,733		)		(28,478		)
	Amortization of prior service cost	210				210				210
	Amortization of net actuarial loss	5,148				16,985				11,026
	Total net periodic benefit cost	12,036				29,480				20,710
	Current year actuarial loss (gain)	69,349				(123,557		)		44,315
	Amortization of actuarial loss	(5,148		)		(16,985		)		(11,026		)
	Amortization of prior service cost	(210		)		(210		)		(210		)
	Total recognized in other comprehensive income	63,991				(140,752		)		33,079
	Total recognized in net periodic benefit cost and other comprehensive income	$	76,027			$	(111,272	)		$	53,789
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations as of December 31, 2014 and 2013, are as follows:
	(Dollars in thousands)	2014			2013
	Discount rate	4.27	%		4.9	%
	Rate of compensation increase	4			4
	The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2014, 2013 and 2012, are as follows:
	(Dollars in thousands)	2014			2013			2012
	Discount rate	4.9	%		4	%		4.75	%
	Rate of compensation increase	4			4			4
	Expected long-term return on plan assets	7.5			7.25			7.5
Schedule of Fair Value and Allocation of Plan Assets	The fair values of pension plan assets at December 31, 2014 and 2013, by asset class are as follows:
		December 31, 2014
	(Dollars in thousands)	Market Value				Quoted prices in				Significant			Significant			Target Allocation		Actual %
						Active Markets				Observable			Nonobservable					of Plan
						for Identical				Inputs			Inputs					Assets
						Assets (Level 1)				(Level 2)			(Level 3)
	Cash and equivalents	$	3,854			$	3,854			$	—		$	—		0 - 1%		1	%
	Equity securities															55 - 65%		62	%
	Large cap	229,315				229,315				—			—
	Mid cap	10,796				10,796				—			—
	Small cap	44,734				44,734				—			—
	International equity (developed)	10,706				10,706				—			—
	International equity (emerging)	41,484				41,484				—			—
	Fixed income									—			—			25 - 40%		28	%
	Investment grade bonds	81,050				—				81,050			—
	Intermediate bonds	53,806				—				53,806			—
	High-yield corporate bonds	6,592				—				6,592			—
	TIPS	2,550				2,550				—			—
	International emerging bond	9,930				—				9,930			—
	Alternative investments															0 - 10%		9	%
	Commodities	17,671				17,671				—			—
	Hedge fund composite	32,468				32,468							—
	Total pension assets	$	544,956			$	393,578			$	151,378		$	—				100	%
		December 31, 2013
		Market Value				Quoted prices in				Significant			Significant			Target Allocation		Actual %
						Active Markets				Observable			Nonobservable					of Plan
						for Identical				Inputs			Inputs					Assets
						Assets (Level 1)				(Level 2)			(Level 3)
	Cash and equivalents	$	2,517			$	2,517			—			—			0 - 1%		1	%
	Equity securities															55 - 65%		62	%
	Large cap	218,023				218,023				—			—
	Mid cap	10,724				10,724				—			—
	Small cap	43,928				43,928				—			—
	International equity (developed)	10,535				10,535				—			—
	International equity (emerging)	40,643				40,643				—			—
	Fixed income															25 - 40%		28	%
	Investment grade bonds	74,501				—				74,501			—
	Intermediate bonds	48,746				—				48,746			—
	High-yield corporate bonds	10,111				—				10,111			—
	TIPS	4,395				4,395				—			—
	International emerging bond	10,119				—				10,119			—
	Alternative investments					—				—			—			0 - 10%		9	%
	Commodities	19,014				19,014				—			—
	Hedge fund composite	30,761				30,761							—
	Total pension assets	$	524,017			$	380,540			$	143,477		$	—				100	%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Funded Status	The following table provides the changes in benefit obligation and plan assets and the funded status of the plan at December 31, 2014.
	(Dollars in thousands)	2014
	Change in benefit obligation
	Projected benefit obligation at October 1 acquisition date	$	137,452
	Service cost	832
	Interest cost	1,488
	Actuarial (gain) loss	12,802
	Benefits paid	(1,242		)
	Projected benefit obligation at December 31	151,332
	Change in plan assets
	Fair value of plan assets at October 1 acquisition date	150,374
	Actual return on plan assets	6,486
	Employer contributions	—
	Benefits paid	(1,242		)
	Fair value of plan assets at December 31	155,618
	Funded status at December 31	$	4,286
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets as of December 31, 2014 consist of:
	(Dollars in thousands)	2014
	Other assets	$	—
	Other liabilities	4,286
	Net asset (liability) recognized	$	4,286
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2014.
	(Dollars in thousands)	2014
	Net loss (gain)	$	9,123
	Less prior service cost	—
	Accumulated other comprehensive loss, excluding income taxes	$	9,123
Schedule of Net Benefit Costs	The following table shows the components of periodic benefit cost related to the pension plan and changes in plan assets and benefit obligations recognized in other comprehensive income for the year ended December 31, 2014. The table only includes amounts since the acquisition of Bancorporation.
		Year ended December 31
	(Dollars in thousands)	2014
	Service cost	$	832
	Interest cost	1,488
	Expected return on assets	(2,807		)
	Amortization of prior service cost	—
	Amortization of net actuarial loss	—
	Total net periodic benefit cost	(487		)
	Current year actuarial loss (gain)	9,123
	Amortization of actuarial loss	—
	Amortization of prior service cost	—
	Total recognized in other comprehensive income	9,123
	Total recognized in net periodic benefit cost and other comprehensive income	$	8,636
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations as of December 31, 2014 are as follows:
	(Dollars in thousands)	2014
	Discount rate	4.27	%
	Rate of compensation increase	4
	The assumptions used to determine the net periodic benefit cost for the year ended December 31, 2014 are as follows:
	(Dollars in thousands)	2014
	Discount rate	4.35	%
	Rate of compensation increase	4
	Expected long-term return on plan assets	7.5
Schedule of Fair Value and Allocation of Plan Assets	The investment strategy of the Bancorporation Plan with respect to pension assets is to invest the assets in accordance with the Employee Retirement Security Act and fiduciary standards. The long-term primary objectives for the Plan are to provide for a reasonable amount of long-term growth of capital, without undue exposure to risk, and to provide investment results that meet or exceed the Plan’s expected long-term rate of return.
		December 31, 2014
	(Dollars in thousands)	Market Value				Quoted prices in				Significant			Significant			Actual %
						Active Markets				Observable			Nonobservable			of Plan
						for Identical				Inputs			Inputs			Assets
						Assets (Level 1)				(Level 2)			(Level 3)
	Equity securities	$	107,333			$	107,333			—			—			68.97	%
	Debt securities	35,208				23,528				11,680			—			22.62	%
	Cash and equivalents	13,077				13,077				—			—			8.4	%
	Total pension assets	$	155,618			$	143,938			$	11,680		$	—

Other_Noninterest_Income_and_O1

Other Noninterest Income and Other Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2014
Noninterest Expense [Abstract]
Schedule of Other Operating Cost and Expense, by Component	Other noninterest expense for the years ended December 31, 2014, 2013 and 2012, included the following:
	(dollars in thousands)	2014		2013		2012
	Cardholder processing	$	11,950	$	9,892	$	11,816
	Merchant processing	39,874		35,279		33,313
	Collection	11,595		21,209		25,591
	Processing fees paid to third parties	17,089		15,095		14,454
	Cardholder reward programs	11,435		10,154		4,325
	Telecommunications	10,834		10,033		11,131
	Consultant	10,168		9,740		3,914
	Advertising	11,461		8,286		3,897
	Other	83,436		73,326		70,874
	Total other noninterest expense	$	207,842	$	193,014	$	179,315

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	At December 31, income tax expense consisted of the following:
	(Dollars in thousands)	2014			2013			2012
	Current tax expense
	Federal	$	84,430		$	46,848		$	89,939
	State	13,941			7,080			9,212
	Total current tax expense	98,371			53,928			99,151
	Deferred tax (benefit) expense
	Federal	(30,658		)	38,731			(26,501		)
	State	(2,681		)	8,915			(7,921		)
	Total deferred tax (benefit) expense	(33,339		)	47,646			(34,422		)
	Total income tax expense	$	65,032		$	101,574		$	64,729
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense differed from the amounts computed by applying the federal income tax rate of 35 percent to pretax income as a result of the following:
	(Dollars in thousands)	2014			2013			2012
	Income taxes at statutory rates	$	71,258		$	93,956		$	68,993
	Increase (reduction) in income taxes resulting from:
	Nontaxable income on loans, leases and investments, net of nondeductible expenses	(1,832		)	(1,185		)	(1,309		)
	State and local income taxes, including change in valuation allowance, net of federal income tax benefit	7,319			10,397			839
	Acquisition stock settlement	(10,185		)	—			—
	Tax credits net of amortization	(2,896		)	(960		)	(2,372		)
	Other, net	1,368			(634		)	(1,422		)
	Total income tax expense	$	65,032		$	101,574		$	64,729
Schedule of Deferred Tax Assets and Liabilities	The net deferred tax asset included the following components at December 31:
	(Dollars in thousands)	2014			2013
	Allowance for loan and lease losses	$	79,537		$	90,790
	Pension liability	15,391			2,593
	Executive separation from service agreements	23,849			9,321
	State operating loss carryforward	29			36
	Unrealized loss on cash flow hedge	1,673			2,786
	Net unrealized loss on securities included in accumulated other comprehensive loss	—			6,541
	Accelerated depreciation	5,550			—
	FDIC assisted transactions timing differences	71,219			42,016
	Other reserves	15,326			6,958
	Other	25,746			10,569
	Deferred tax asset	238,320			171,610
	Accelerated depreciation	—			4,382
	Lease financing activities	10,762			10,216
	Net unrealized gain on securities included in accumulated other comprehensive loss	3,245			—
	Net deferred loan fees and costs	4,772			4,302
	Intangible assets	7,729			17,558
	Security, loan and debt valuations	34,289			—
	Other	11,395			4,564
	Deferred tax liability	72,192			41,022
	Net deferred tax asset	$	166,128		$	130,588

Transactions_with_Related_Pers1

Transactions with Related Persons (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	For those identified as Related Persons as of December 31, 2014, the following table provides an analysis of changes in the loans outstanding during 2014:
	(dollars in thousands)
	Balance at January 1, 2014	$	1,825
	New loans	39
	Repayments	(819		)
	Balance at December 31, 2014	$	1,045

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative [Line Items]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) included the following as of December 31, 2014, and December 31, 2013:
		December 31, 2014									December 31, 2013
	(Dollars in thousands)	Accumulated			Deferred			Accumulated			Accumulated			Deferred			Accumulated
		other			tax			other			other			tax			other
		comprehensive			benefit			comprehensive			comprehensive			expense			comprehensive
		income (loss)						income (loss),			loss			(benefit)			loss,
								net of tax									net of tax
	Unrealized gains (losses) on investment securities available for sale	$	8,343		$	3,245		$	5,098		$	(16,632	)	$	(6,541	)	$	(10,091	)
	Unrealized loss on cash flow hedge	(4,337		)	(1,673		)	(2,664		)	(7,220		)	(2,786		)	(4,434		)
	Funded status of defined benefit plan	(90,696		)	(35,281		)	(55,415		)	(17,582		)	(6,839		)	(10,743		)
	Total	$	(86,690	)	$	(33,709	)	$	(52,981	)	$	(41,434	)	$	(16,166	)	$	(25,268	)
	The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2014, and December 31, 2013:
	(Dollars in thousands)	Unrealized gains and losses on available-for-sale securities(1)			Gains and losses on cash flow hedges(1)			Defined benefit pension items(1)			Total
	Balance at January 1, 2013	$	20,517		$	(6,292	)	$	(96,331	)	$	(82,106	)
	Other comprehensive income (loss) before reclassifications	(30,608		)	1,858			75,082			46,332
	Amounts reclassified from accumulated other comprehensive income (loss)	—			—			10,506			10,506
	Net current period other comprehensive income (loss)	(30,608		)	1,858			85,588			56,838
	Balance at December 31, 2013	(10,091		)	(4,434		)	(10,743		)	(25,268		)
	Other comprehensive income (loss) before reclassifications	(2,683		)	1,770			(47,946		)	(48,859		)
	Amounts reclassified from accumulated other comprehensive loss	17,872			—			3,274			21,146
	Net current period other comprehensive income (loss)	15,189			1,770			(44,672		)	(27,713		)
	Balance at December 31, 2014	$	5,098		$	(2,664	)	$	(55,415	)	$	(52,981	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
Interest Rate Swap
Derivative [Line Items]
Schedule Of Interest Rate Swaps	The following table provides the notional amount of the interest rate swap and the fair value of the liability as of December 31, 2014 and 2013.
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Notional			Estimated fair value of liability			Notional			Estimated fair value of liability
		amount						amount
	2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016	$	93,500		$	4,337		$	93,500		$	7,220

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill [Line Items]
Changes in Goodwill	The following table presents the changes in the carrying amount of goodwill.
	(Dollars in thousands)	2014			2013
	Balance at January 1	$	102,625		$	102,625
	Acquired in the 1st Financial merger	32,915			—
	Acquired in the Bancorporation merger	4,233			—
	Balance at December 31	$	139,773		$	102,625
Mortgage Servicing Rights Key Economic Assumptions Used to Value	Key economic assumptions used to value mortgage servicing rights as of December 31, 2014:
		2014
	Discount rate - conventional fixed loans	7.2		%
	Discount rate - all loans excluding conventional fixed loans	9.2		%
	Weighted average constant prepayment rate	14.25		%
	Weighted average cost to service loans	$	56.02
Schedule of Mortgage Servicing Rights at Amortized Cost	The activity of the servicing asset for 2014 and 2013 is presented in the following table:
	(Dollars in thousands)	2014			2013
	Balance at January 1	$	16		$	1,784
	Servicing rights originated	727			—
	Amortization	(919		)	(205		)
	Servicing rights acquired in the 1st Financial merger	148			—
	Servicing rights acquired in the Bancorporation merger	17,566			—
	Servicing assets sold	—			(1,563		)
	Valuation allowance	$	(850	)	$	—
	Balance at December 31	$	16,688		$	16
Schedule of Other Intangible Assets	The following information relates to other intangible assets, all customer-related, which are being amortized over their estimated useful lives:
	(dollars in thousands)	2014			2013
	Balance at January 1	$	1,247		$	3,556
	Acquired in the 1st Financial merger	3,780			—
	Acquired in the Bancorporation merger	91,850			—
	Amortization	(6,955		)	(2,309		)
	Balance at December 31	$	89,922		$	1,247
	Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2014. BancShares recorded $88.0 million and $3.8 million in core deposit intangibles related to the Bancorporation and 1st Financial mergers, respectively. Intangible assets generated by acquisitions, which represent the estimated fair value of core deposits and other customer relationships that were acquired, are being amortized on an accelerated basis over their estimated useful lives. The estimated useful remaining lives range from less than 1 year to no more than 10 years.
	The gross amount of other intangible assets and accumulated amortization as of December 31, 2014 and 2013, are:
	(dollars in thousands)	2014			2013
	Gross balance	$	114,596		$	18,966
	Accumulated amortization	(24,674		)	(17,719		)
	Carrying value	$	89,922		$	1,247
Future Amortization Expense Schedule	Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be:
	(dollars in thousands)
	2015	$	18,576
	2016	16,200
	2017	13,951
	2018	11,701
	2019	9,457

Shareholders_Equity_Dividends_1

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	Following is an analysis of capital ratios for BancShares, FCB, and FCB-SC as of December 31, 2014 and 2013:
		December 31, 2014						December 31, 2013
	(Dollars in thousands)	Amount		Ratio		Requirements to be well-capitalized		Amount		Ratio		Requirements to be well-capitalized
	BancShares
	Tier 1 capital (1)	$	2,690,324	13.61	%	6	%	$	2,103,926	14.89	%	6	%
	Total capital (1)	2,904,123		14.69	%	10	%	2,315,579		16.39	%	10	%
	Leverage capital (1)	2,690,324		8.91	%	5	%	2,103,926		9.8	%	5	%
	FCB
	Tier 1 capital (1)	2,019,595		13.12	%	6	%	1,978,136		14.1	%	6	%
	Total capital (1)	2,212,163		14.37	%	10	%	2,179,248		15.54	%	10	%
	Leverage capital (1)	2,019,595		9.3	%	5	%	1,978,136		9.34	%	5	%
	FCB-SC
	Tier 1 capital	653,515		15.11	%	6	%	734,218		17.09	%	6	%
	Total capital	657,475		15.2	%	10	%	787,962		18.34	%	10	%
	Leverage capital	653,515		7.89	%	5	%	734,218		9.12	%	5	%

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) included the following as of December 31, 2014, and December 31, 2013:
		December 31, 2014										December 31, 2013
	(Dollars in thousands)	Accumulated				Deferred			Accumulated			Accumulated			Deferred			Accumulated
		other				tax			other			other			tax			other
		comprehensive				benefit			comprehensive			comprehensive			expense			comprehensive
		income (loss)							income (loss),			loss			(benefit)			loss,
									net of tax									net of tax
	Unrealized gains (losses) on investment securities available for sale	$	8,343			$	3,245		$	5,098		$	(16,632	)	$	(6,541	)	$	(10,091	)
	Unrealized loss on cash flow hedge	(4,337		)		(1,673		)	(2,664		)	(7,220		)	(2,786		)	(4,434		)
	Funded status of defined benefit plan	(90,696		)		(35,281		)	(55,415		)	(17,582		)	(6,839		)	(10,743		)
	Total	$	(86,690	)		$	(33,709	)	$	(52,981	)	$	(41,434	)	$	(16,166	)	$	(25,268	)
	The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2014, and December 31, 2013:
	(Dollars in thousands)	Unrealized gains and losses on available-for-sale securities(1)				Gains and losses on cash flow hedges(1)			Defined benefit pension items(1)			Total
	Balance at January 1, 2013	$	20,517			$	(6,292	)	$	(96,331	)	$	(82,106	)
	Other comprehensive income (loss) before reclassifications	(30,608		)		1,858			75,082			46,332
	Amounts reclassified from accumulated other comprehensive income (loss)	—				—			10,506			10,506
	Net current period other comprehensive income (loss)	(30,608		)		1,858			85,588			56,838
	Balance at December 31, 2013	(10,091		)		(4,434		)	(10,743		)	(25,268		)
	Other comprehensive income (loss) before reclassifications	(2,683		)		1,770			(47,946		)	(48,859		)
	Amounts reclassified from accumulated other comprehensive loss	17,872				—			3,274			21,146
	Net current period other comprehensive income (loss)	15,189				1,770			(44,672		)	(27,713		)
	Balance at December 31, 2014	$	5,098			$	(2,664	)	$	(55,415	)	$	(52,981	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
Reclassification out of Accumulated Other Comprehensive Income
	(Dollars in thousands)		Year ended December 31, 2014
	Details about accumulated other comprehensive loss		Amount reclassified from accumulated other comprehensive income (loss)(1)				Affected line item in the statement where net income is presented
	Unrealized gains and losses on available for sale securities
			$	(29,096	)		Securities gains
			11,224				Income taxes
			$	(17,872	)		Net income
	Amortization of defined benefit pension items
	Prior service costs		$	(210	)		Employee benefits
	Actuarial losses		(5,148		)		Employee benefits
			(5,358		)		Income before income taxes
			2,084				Income taxes
			$	(3,274	)		Net income
	Total reclassifications for the period		$	(21,146	)
			Year ended December 31, 2013
	Details about accumulated other comprehensive loss		Amount reclassified from accumulated other comprehensive income (loss)(1)				Affected line item in the statement where net income is presented
	Amortization of defined benefit pension items
	Prior service costs		$	(210	)		Employee benefits
	Actuarial losses		(16,985		)		Employee benefits
			(17,195		)		Income before income taxes
			6,689				Income taxes
			$	(10,506	)		Net income
	Total reclassifications for the period		$	(10,506	)
	(1) Amounts in parentheses indicate debits to profit/loss.

Parent_Company_Financial_State1

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets
	Parent Company
	Condensed Balance Sheets
	(Dollars in thousands)	December 31, 2014			December 31, 2013
	Assets
	Cash	$	24,026		$	13,047
	Investment securities available for sale	110,644			234,488
	Investment in subsidiaries (1)	2,815,866			2,053,292
	Due from subsidiaries	295,994			145,666
	Other assets	74,157			144,998
	Total assets	$	3,320,687		$	2,591,491
	Liabilities and Shareholders' Equity
	Short-term borrowings	$	485,207		$	411,907
	Long-term obligations	136,717			96,392
	Other liabilities	11,169			11,730
	Shareholders' equity (1)	2,687,594			2,071,462
	Total liabilities and shareholders' equity (1)	$	3,320,687		$	2,591,491
Condensed Income Statements
	Parent Company
	Condensed Income Statements
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	Interest income	$	1,784		$	1,387		$	1,353
	Interest expense	9,694			7,065			15,435
	Net interest loss	(7,910		)	(5,678		)	(14,082		)
	Dividends from subsidiaries	82,419			131,006			179,588
	Other income	33,600			3,620			2,843
	Other operating expense	6,534			2,344			6,384
	Income before income tax benefit and equity in undistributed net income of subsidiaries	101,575			126,604			161,965
	Income tax benefit	(2,590		)	(2,095		)	(8,417		)
	Income before equity in undistributed net income of subsidiaries	104,165			128,699			170,382
	Equity (excess distributions) in undistributed net income of subsidiaries (1)	34,397			38,170			(37,987		)
	Net income (1)	$	138,562		$	166,869		$	132,395
Condensed Statements of Cash Flows
	Parent Company
	Condensed Statements of Cash Flows
		Year ended December 31
	(Dollars in thousands)	2014			2013			2012
	OPERATING ACTIVITIES
	Net income (1)	$	138,562		$	166,869		$	132,395
	Adjustments
	Excess distributions (undistributed) net income of subsidiaries (1)	(34,397		)	(38,170		)	37,987
	Net amortization of premiums and discounts	594			334			439
	Securities gains	(29,126		)	—			(2,274		)
	Gain on elimination of acquired debt	(1,988		)	—			—
	Gain on sale of other assets	—			(1,331		)	—
	Other than temporary impairment on securities	—			—			45
	Change in other assets	93,385			(61,704		)	30,761
	Change in other liabilities	2,250			(2,096		)	(10,148		)
	Net cash provided by operating activities	169,280			63,902			189,205
	INVESTING ACTIVITIES
	Net change in due from subsidiaries	(150,328		)	(67,154		)	42,323
	Purchases of investment securities	(33,243		)	(126,197		)	(111,409		)
	Proceeds from sales, calls, and maturities of securities	114,208			135,000			112,625
	Investment in subsidiaries	1,579			1,489			9,298
	Business acquisitions, net of cash acquired	(24,772		)	—			—
	Net cash (used) provided by investing activities	(92,556		)	(56,862		)	52,837
	FINANCING ACTIVITIES
	Net change in short-term borrowings	(1,211		)	12,860			23,651
	Retirement of long-term obligations	(52,372		)	—			(155,305		)
	Stock issuance costs	(619		)	—			—
	Repurchase of common stock	—			(321		)	(103,624		)
	Cash dividends paid	(11,543		)	(8,663		)	(15,398		)
	Net cash provided (used) by financing activities	(65,745		)	3,876			(250,676		)
	Net change in cash	10,979			10,916			(8,634		)
	Cash balance at beginning of year	13,047			2,131			10,765
	Cash balance at end of year	$	24,026		$	13,047		$	2,131
	CASH PAYMENTS FOR:
	Interest	$	5,079		$	6,904		$	25,574
	Income taxes	127,970			102,890			66,453
	(1) Amounts for 2013 and 2012 periods have been updated to reflect the fourth quarter 2014 adoption of Accounting Standard Update (ASU) 2014-01 related to qualified affordable housing projects.

Accounting_Policies_and_Basis_2

Accounting Policies and Basis of Presentation Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
	branch
Property, Plant and Equipment [Line Items]
Period fair values are subject to refinement	1 year
Number of branches	572
Net deferred fees on non-PCI loans	$20,800,000		$22,900,000
Baseline for measurement	500,000
Securities sold under repurchase agreements	294,400,000		97,000,000
Cumulative effect of the retrospective application of the change in amortization method		-2,430,000
Class A Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock	1
Class B Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock	16
Premises | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of asset	25 years
Premises | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of asset	40 years
Furniture, Software, and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of asset	3 years
Furniture, Software, and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of asset	10 years
Shares and Cash
Property, Plant and Equipment [Line Items]
Right to receive cash per share	50
Shares and Cash | Class A Common Stock
Property, Plant and Equipment [Line Items]
Right to receive number of shares conversion	4
Shares Only | Class A Common Stock
Property, Plant and Equipment [Line Items]
Right to receive number of shares conversion	3.58
Shares Only | Class B Common Stock
Property, Plant and Equipment [Line Items]
Right to receive number of shares conversion	0.42
Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
Cumulative effect of the retrospective application of the change in amortization method		($2,430,000)

Business_Combinations_Businss_

Business Combinations Businss Combinations (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 02, 2014	Jan. 02, 2014	Oct. 01, 2014
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value						$4,175,586,000
Short-term borrowings						296,100,000
Merger-related expenses	13,064,000	391,000	791,000
Bancorporation
Business Acquisition [Line Items]
BancShares number of shares owned in Bancorporation				32,042
Gain on Bancorporation stock				29,129
Cash paid to shareholders				30,394,000
Fair value of Bancorporation shares owned by BancShares						29,551,000
Total purchase price				624,192,000
Cash and due from banks						194,570,000
Overnight investments						1,087,325,000
Investment securities						2,011,263,000
Loans held for sale						30,997,000
Loans and leases						4,491,067,000
Premises and equipment						238,646,000
Other real estate owned						35,344,000
Income earned not collected						15,266,000
FDIC loss share receivable						5,106,000
Other intangible assets						109,416,000
Other assets						56,367,000
Total assets acquired						8,275,367,000
Deposits						7,174,817,000
Short-term borrowings						295,681,000
Long-term obligations						124,852,000
FDIC loss share payable						224,000
Other liabilities						59,834,000
Total liabilities assumed						7,655,408,000
Fair value of net assets (liabilities) acquired						619,959,000
Goodwill acquired	4,233,000	0		4,233,000
Revenue of acquired business	92,800,000
Net income of acquired business	12,700,000
Merger-related expenses	8,000,000
Pro forma revenue	1,336,340,000	1,412,226,000
Pro forma net income	-13,171,000	210,529,000
Goodwill Impairment Prior To Acquisition				166,800,000
Bancorporation | Class A Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	2,586,762
Value of shares of BancShares common stock issued to Bancorporation shareholders						560,370,000
Bancorporation | Class B Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	18,202
Value of shares of BancShares common stock issued to Bancorporation shareholders						3,877,000
1st Financial
Business Acquisition [Line Items]
Cash paid to shareholders					2,000,000
Cash paid to acquire and retire TARP securities					8,000,000
Total purchase price					10,000,000
Cash and due from banks					28,194,000
Investment securities					237,438,000
Loans held for sale					1,183,000
Restricted equity securities					3,776,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value					307,927,000
Premises and equipment					2,686,000
Other real estate owned					11,591,000
Other intangible assets					3,780,000
Other assets					16,346,000
Total assets acquired					612,921,000
Deposits					631,871,000
Short-term borrowings					406,000
Other liabilities					3,559,000
Total liabilities assumed					635,836,000
Fair value of net assets (liabilities) acquired					22,915,000
Goodwill acquired	32,915,000	0			32,915,000
Revenue of acquired business	15,200,000
Merger-related expenses	5,000,000
Subsequent adjustment to goodwill for revised fair value estimate in acquisition	-8,400,000
Shares and Cash
Business Acquisition [Line Items]
Right to receive cash per share	50
Shares and Cash | Class A Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	4
Shares and Cash | Bancorporation
Business Acquisition [Line Items]
Right to receive cash per share	$50
Shares and Cash | Bancorporation | Class A Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	4
Shares Only | Class A Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	3.58
Shares Only | Class B Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	0.42
Shares Only | Bancorporation | Class A Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	3.58
Shares Only | Bancorporation | Class B Common Stock
Business Acquisition [Line Items]
Right to receive number of shares conversion	0.42

Investments_Aggregate_Values_a

Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months	$832,400,000
Investment securities available for sale
Cost	7,163,574,000	5,404,335,000
Gross Unrealized Gains	20,589,000	28,188,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	12,246,000	44,820,000
Fair Value	7,171,917,000	5,387,703,000
Investment securities held to maturity
Cost	518,000	907,000
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months	10,000,000
U. S. Treasury
Investment securities available for sale
Cost	2,626,900,000	373,223,000
Gross Unrealized Gains	2,922,000	259,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	152,000	45,000
Fair Value	2,629,670,000	373,437,000
Government Agency
Investment securities available for sale
Cost	908,362,000	2,543,223,000
Gross Unrealized Gains	702,000	1,798,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	247,000	792,000
Fair Value	908,817,000	2,544,229,000
Mortgage Backed Securities, Other [Member]
Investment securities available for sale
Cost	3,628,187,000	2,486,297,000
Gross Unrealized Gains	16,964,000	4,526,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	11,847,000	43,950,000
Fair Value	3,633,304,000	2,446,873,000
Investment securities held to maturity
Cost	518,000	907,000
Held To Maturity Securities Accumulated Unrecognized Holding Gain	26,000	67,000
Held To Maturity Securities Accumulated Unrecognized Holding Loss	0	0
Fair Value	544,000	974,000
Equity Securities
Investment securities available for sale
Cost		543,000
Gross Unrealized Gains		21,604,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		0
Fair Value		22,147,000
State, County and Municipal
Investment securities available for sale
Cost	125,000	186,000
Gross Unrealized Gains	1,000	1,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fair Value	126,000	187,000
Other Debt Obligations
Investment securities available for sale
Cost		863,000
Gross Unrealized Gains		0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		33,000
Fair Value		$830,000

Investments_Maturity_Informati

Investments (Maturity Information) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment securities available for sale
Total investment securities available for sale, cost	$7,163,574	$5,404,335
Investment securities available for sale	7,171,917	5,387,703
Investment securities held to maturity
Investment securities held to maturity	518	907
Debt Securities
Investment securities available for sale
Maturing in one year or less, cost	447,866	839,956
Maturing in one through five years, cost	3,087,521	2,077,539
Maturing in one year or less, fair value	447,992	840,883
Maturing in one through five years, fair value	3,090,621	2,077,800
Equity Securities
Investment securities available for sale
Total investment securities available for sale, cost	0	543
Investment securities available for sale	0	22,147
Mortgage Backed Securities, Other [Member]
Investment securities available for sale
Total investment securities available for sale, cost	3,628,187	2,486,297
Investment securities available for sale	3,633,304	2,446,873
Investment securities held to maturity
Investment securities held to maturity	518	907
Fair Value	$544	$974

Investments_Securities_Gains_L

Investments (Securities Gains (Losses)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Gross gains on sales of investment securities available for sale	$29,129	$0	$2,324
Gross losses on sales of investment securities available for sale	-33	0	-2
Other than temporary impairment loss on equity securities	0	0	-45
Total securities gains (losses)	$29,096	$0	$2,277

Investments_Unrealized_Losses_

Investments (Unrealized Losses) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment securities available for sale:
Less than 12 months, fair value	$1,173,274	$3,104,700
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	2,203	43,715
12 months or more, fair value	832,420	56,830
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments	10,043	1,105
Total fair value	2,005,694	3,161,530
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	12,246	44,820
U. S. Treasury
Investment securities available for sale:
Less than 12 months, fair value	338,612	102,105
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	151	45
12 months or more, fair value	1,015	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments	1	0
Total fair value	339,627	102,105
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	152	45
Government Agency
Investment securities available for sale:
Less than 12 months, fair value	261,288	780,552
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	247	761
12 months or more, fair value	0	29,969
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments	0	31
Total fair value	261,288	810,521
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	247	792
Mortgage Backed Securities, Other [Member]
Investment securities available for sale:
Less than 12 months, fair value	573,374	2,221,213
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	1,805	42,876
12 months or more, fair value	831,405	26,861
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments	10,042	1,074
Total fair value	1,404,779	2,248,074
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	11,847	43,950
Other Debt Obligations
Investment securities available for sale:
Less than 12 months, fair value		830
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments		33
12 months or more, fair value		0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments		0
Total fair value		830
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		33
State, County and Municipal
Investment securities available for sale:
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$0	$0

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2014
	investments
Investments [Abstract]
Investment in Bancorporation stock			$21,600,000
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months	832,400,000
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months	10,000,000
Number of investments in continuous unrealized loss position for more than twelve months	86
Unrealized losses related to marketability of securities or issuers ability to honor redemption obligations	0	0
Investment value deemed to be OTTI	0
Investment securities, aggregate carrying value, pledged as collateral	$4,370,000,000	$2,750,000,000

Loans_and_Leases_Narrative_Det

Loans and Leases (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$119,593,000	$132,146,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining	61,200,000
Loans and Leases Receivable, Collateral for Secured Borrowings	2,200,000,000	1,380,000,000
Advances from Federal Home Loan Banks	240,300,000	240,300,000
Federal Home Loan Bank Advances, Current Borrowing Capacity	1,960,000,000	1,140,000,000
Noncovered loans pledged to secure debt obligations	3,160,000,000	2,560,000,000
Charge off of past due business credit card loans (days)	120 days
Loans and Leases Receivable, Gross, Carrying Amount, Covered	485,300,000	1,029,400,000
Sun American Bank
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	41,100,000
First Regional Bank
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	73,200,000
Williamsburg First National Bank
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	9,100,000
Loans on the Cost Recovery Method
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired impaired loans	$33,422,000	$28,493,000

Loans_and_Leases_Loans_and_Lea

Loans and Leases (Loans and Leases Outstanding) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$485,300,000	$1,029,400,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	1,186,498,000	1,029,426,000	1,809,235,000
Non-PCI	17,582,967,000	12,104,298,000
Total loans and leases	18,769,465,000	13,133,724,000
Commercial
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	726,123,000	781,307,000
Non-PCI	11,263,074,000	8,499,348,000
Commercial | Construction and land development
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	78,079,000	78,915,000
Non-PCI	550,568,000	319,847,000
Commercial | Mortgage
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	577,518,000	642,891,000
Non-PCI	7,552,948,000	6,362,490,000
Commercial | Commercial and industrial
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	27,254,000	17,254,000
Non-PCI	1,988,934,000	1,081,158,000
Commercial | Lease financing
Non-PCI	571,916,000	381,763,000
Commercial | Other commercial real estate
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	40,193,000	41,381,000
Non-PCI	244,875,000	178,754,000
Commercial | Other
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079,000	866,000
Non-PCI	353,833,000	175,336,000
Noncommercial
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	460,375,000	248,119,000
Non-PCI	6,319,893,000	3,604,950,000
Noncommercial | Mortgage
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	382,340,000	213,851,000
Non-PCI	2,520,542,000	982,421,000
Noncommercial | Construction and land development
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	912,000	2,583,000
Non-PCI	120,097,000	122,792,000
Noncommercial | Revolving mortgage
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	74,109,000	30,834,000
Non-PCI	2,561,800,000	2,113,285,000
Noncommercial | Consumer
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,014,000	851,000
Non-PCI	1,117,454,000	386,452,000
Temecula Valley Bank [Member]
Loans, not covered by FDIC loss share agreements	177,300,000
Venture Bank [Member]
Loans, not covered by FDIC loss share agreements	61,400,000
Georgian Bank [Domain]
Loans, not covered by FDIC loss share agreements	40,900,000
Sun American Bank
Loans and Leases Receivable, Gross, Carrying Amount, Covered	41,100,000
First Regional Bank
Loans and Leases Receivable, Gross, Carrying Amount, Covered	73,200,000
Williamsburg First National Bank
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$9,100,000

Loans_and_Leases_Composition_o

Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	$17,582,967	$12,104,298
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	1,186,498	1,029,426	1,809,235
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	11,263,074	8,499,348
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	726,123	781,307
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	550,568	319,847
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	78,079	78,915
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	7,552,948	6,362,490
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	577,518	642,891
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	244,875	178,754
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	40,193	41,381
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,988,934	1,081,158
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	27,254	17,254
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	571,916	381,763
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	353,833	175,336
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079	866
Commercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079	866
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	10,825,323	8,092,174
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	342,172	330,555
Commercial | Pass | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	525,711	308,231
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	13,514	2,619
Commercial | Pass | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	7,284,714	6,094,505
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	300,187	296,824
Commercial | Pass | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	242,053	174,913
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	11,033	22,225
Commercial | Pass | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,859,415	964,840
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	16,637	8,021
Commercial | Pass | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	564,319	375,371
Commercial | Pass | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	349,111	174,314
Commercial | Pass | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	801	866
Commercial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	182,453	147,325
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	125,195	146,841
Commercial | Special Mention | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	20,025	8,620
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	6,063	15,530
Commercial | Special Mention | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	129,247	119,515
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	98,724	125,295
Commercial | Special Mention | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	909	1,362
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	16,271	3,431
Commercial | Special Mention | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	27,683	14,686
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	4,137	2,585
Commercial | Special Mention | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	3,205	2,160
Commercial | Special Mention | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,384	982
Commercial | Special Mention | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	0	0
Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	157,333	156,956
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	247,138	244,122
Commercial | Substandard | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	4,720	2,944
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	53,739	52,228
Commercial | Substandard | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	134,677	141,913
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	171,920	179,657
Commercial | Substandard | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,765	2,216
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	12,889	7,012
Commercial | Substandard | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	8,878	6,352
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	6,312	5,225
Commercial | Substandard | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	3,955	3,491
Commercial | Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	3,338	40
Commercial | Substandard | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	2,278	0
Commercial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,895	6,022
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	9,241	57,877
Commercial | Doubtful | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	0	52
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	2,809	7,436
Commercial | Doubtful | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,366	5,159
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	6,302	40,471
Commercial | Doubtful | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	0	75
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	0	8,713
Commercial | Doubtful | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	164	144
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	130	1,257
Commercial | Doubtful | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	365	592
Commercial | Doubtful | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	0	0
Commercial | Doubtful | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	0	0
Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	95,070	96,871
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	2,377	1,912
Commercial | Ungraded | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	112	0
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	1,954	1,102
Commercial | Ungraded | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,944	1,398
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	385	644
Commercial | Ungraded | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	148	188
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	0	0
Commercial | Ungraded | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	92,794	95,136
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	38	166
Commercial | Ungraded | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	72	149
Commercial | Ungraded | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	0	0
Commercial | Ungraded | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	6,319,893	3,604,950
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	460,375	248,119
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,520,542	982,421
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	382,340	213,851
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,561,800	2,113,285
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	74,109	30,834
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	120,097	122,792
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	912	2,583
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,117,454	386,452
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,014	851
Non-PCI Loans [Member] | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	398,225	192,179
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	460,375	248,119
30-59 Days Past Due	12,984	17,402
60-89 Days Past Due	10,443	6,544
90 Days or Greater	38,723	31,994
Non-PCI Loans [Member] | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	326,589	162,771
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	382,340	213,851
30-59 Days Past Due	11,432	15,261
60-89 Days Past Due	10,073	6,544
90 Days or Greater	34,246	29,275
Non-PCI Loans [Member] | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	68,548	26,642
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	74,109	30,834
30-59 Days Past Due	1,405	2,138
60-89 Days Past Due	345	0
90 Days or Greater	3,811	2,054
Non-PCI Loans [Member] | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	506	1,925
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	912	2,583
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or Greater	406	658
Non-PCI Loans [Member] | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,582	841
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,014	851
30-59 Days Past Due	147	3
60-89 Days Past Due	25	0
90 Days or Greater	$260	$7

Loans_and_Leases_Aging_Of_The_

Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	$17,582,967	$12,104,298
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	11,263,074	8,499,348
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	550,568	319,847
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	7,552,948	6,362,490
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	244,875	178,754
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,988,934	1,081,158
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	571,916	381,763
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	353,833	175,336
Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	6,319,893	3,604,950
Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,520,542	982,421
Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,561,800	2,113,285
Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	120,097	122,792
Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,117,454	386,452
Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	57,321	44,167
60-89 Days Past Due	19,548	14,236
90 Days or Greater	24,598	30,828
Total	101,467	89,231
Current	17,481,500	12,015,067
Loans and leases, not acquired in a transfer accounted for as debt securities	17,582,967	12,104,298
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,796	1,603
60-89 Days Past Due	621	9
90 Days or Greater	385	457
Total	2,802	2,069
Current	547,766	317,778
Loans and leases, not acquired in a transfer accounted for as debt securities	550,568	319,847
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,367	11,131
60-89 Days Past Due	4,782	3,601
90 Days or Greater	8,061	14,407
Total	24,210	29,139
Current	7,528,738	6,333,351
Loans and leases, not acquired in a transfer accounted for as debt securities	7,552,948	6,362,490
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	206	139
60-89 Days Past Due	70	210
90 Days or Greater	102	470
Total	378	819
Current	244,497	177,935
Loans and leases, not acquired in a transfer accounted for as debt securities	244,875	178,754
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,843	3,336
60-89 Days Past Due	1,545	682
90 Days or Greater	378	436
Total	4,766	4,454
Current	1,984,168	1,076,704
Loans and leases, not acquired in a transfer accounted for as debt securities	1,988,934	1,081,158
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,631	789
60-89 Days Past Due	8	1,341
90 Days or Greater	2	101
Total	1,641	2,231
Current	570,275	379,532
Loans and leases, not acquired in a transfer accounted for as debt securities	571,916	381,763
Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	146	0
60-89 Days Past Due	1,966	85
90 Days or Greater	0	0
Total	2,112	85
Current	351,721	175,251
Loans and leases, not acquired in a transfer accounted for as debt securities	353,833	175,336
Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	39,332	27,169
60-89 Days Past Due	10,556	8,308
90 Days or Greater	15,670	14,957
Current	6,254,335	3,554,516
Loans and leases, not acquired in a transfer accounted for as debt securities	6,319,893	3,604,950
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	23,288	12,885
60-89 Days Past Due	6,018	4,658
90 Days or Greater	8,955	9,578
Total	38,261	27,121
Current	2,482,281	955,300
Loans and leases, not acquired in a transfer accounted for as debt securities	2,520,542	982,421
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,097	10,977
60-89 Days Past Due	2,433	2,378
90 Days or Greater	5,463	4,450
Total	18,993	17,805
Current	2,542,807	2,095,480
Loans and leases, not acquired in a transfer accounted for as debt securities	2,561,800	2,113,285
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	370	1,193
60-89 Days Past Due	486	317
90 Days or Greater	147	256
Total	1,003	1,766
Current	119,094	121,026
Loans and leases, not acquired in a transfer accounted for as debt securities	120,097	122,792
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	4,577	2,114
60-89 Days Past Due	1,619	955
90 Days or Greater	1,105	673
Total	7,301	3,742
Current	1,110,153	382,710
Loans and leases, not acquired in a transfer accounted for as debt securities	$1,117,454	$386,452

Loans_and_Leases_Recorded_Inve

Loans and Leases (Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$15,516	$30,801
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	10,861	26,681
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	446	1,002
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	8,937	23,387
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	449	1,150
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	664	1,142
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	365	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	4,655	4,120
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	4,655	3,663
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	457
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	0
Noncommercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	0
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	44,005	53,170
Loans and leases greater than 90 days and accruing	11,250	8,784
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	343	544
Loans and leases greater than 90 days and accruing	111	0
Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	24,720	33,529
Loans and leases greater than 90 days and accruing	1,003	1,113
Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	619	1,610
Loans and leases greater than 90 days and accruing	35	0
Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,741	1,428
Loans and leases greater than 90 days and accruing	239	294
Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	374	832
Loans and leases greater than 90 days and accruing	2	0
Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	14,242	14,701
Loans and leases greater than 90 days and accruing	3,191	1,998
Non-PCI Loans | Noncommercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,966	0
Loans and leases greater than 90 days and accruing		0
Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	457
Loans and leases greater than 90 days and accruing	147	256
Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	0
Loans and leases greater than 90 days and accruing	5,463	4,450
Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	0	69
Loans and leases greater than 90 days and accruing	$1,059	$673

Loans_and_Leases_Changes_In_Ca

Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	$828,156
Carrying Value of Acquired Impaired Loans [Roll Forward]
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	-578,704	-1,004,481
Outstanding principal balance	2,057,691	1,833,955
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	1,186,498	1,029,426	1,809,235
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	735,381
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	623,408	0
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	112,368	224,672
Loans on the Cost Recovery Method
Carrying Value of Acquired Impaired Loans [Roll Forward]
Ending balance	33,422	28,493
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	726,123	781,307
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	301,857
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	460,375	248,119
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	321,551
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	78,079	78,915
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	69,789
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	577,518	642,891
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	176,841
Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	382,340	213,851
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	287,675
Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	74,109	30,834
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	29,777
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	40,193	41,381
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	15,425
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	27,254	17,254
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	37,583
Other | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079	866
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	2,219
Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	912	2,583
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	199
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,014	851
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$3,900

Loans_and_Leases_Changes_In_Ca1

Loans and Leases (Changes In Carrying Amount Of Accretable Yield) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2014	Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition			$4,708,681
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition			59,187
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			4,175,586
Changes in Amount of Accretable Yield [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield	418,160	439,990		539,564
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions	111,973	0
Accretion	-112,368	-224,672
Reclassifications from nonaccretable difference	7,865	92,349
Changes in expected cash flows that do not affect nonaccretable difference	($29,300)	$32,749

Loans_and_Leases_Loans_and_Lea1

Loans and Leases Loans and Leases (Recorded Fair Values of Purchased Non-Impaired Loans and Leases) (Details) (USD $)	Oct. 01, 2014
In Thousands, unless otherwise specified
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	$4,175,586
Commercial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	1,747,900
Commercial | Construction and land development
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	134,941
Commercial | Commercial Mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	951,794
Commercial | Other commercial real estate
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	61,856
Commercial | Commercial and industrial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	431,367
Commercial | Lease financing
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	72,563
Commercial | Other
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	95,379
Noncommercial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	2,427,686
Noncommercial | Commercial Mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	1,305,140
Noncommercial | Revolving mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	419,106
Noncommercial | Construction and land development
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	7,165
Noncommercial | Consumer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	$696,275

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) (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]
Beginning balance	$233,394	$319,018		$270,144
Reclassification	0	7,368	[1]	0
Provisions	640	-32,255		142,885
Charge-offs	-37,770	-68,026		-100,478
Recoveries	8,202	7,289		6,467
Net charge-offs	-29,568	-60,737		-94,011
Ending balance	204,466	233,394		319,018
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	204,466	233,394		319,018
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	119,593	132,146
Loans and leases collectively evaluated for impairment	17,463,374	11,972,152
Loans and leases, not acquired in a transfer accounted for as debt securities	17,582,967	12,104,298
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	1,186,498	1,029,426		1,809,235
Commercial
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	11,263,074	8,499,348
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	726,123	781,307
Commercial | Construction and land development
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	550,568	319,847
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	78,079	78,915
Commercial | Mortgage
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	7,552,948	6,362,490
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	577,518	642,891
Commercial | Other commercial real estate
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	244,875	178,754
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	40,193	41,381
Commercial | Commercial and industrial
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,988,934	1,081,158
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	27,254	17,254
Commercial | Lease financing
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	571,916	381,763
Commercial | Other
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	353,833	175,336
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079	866
Commercial | Consumer and Other
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,079	866
Noncommercial
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification	7,368
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	6,319,893	3,604,950
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	460,375	248,119
Noncommercial | Mortgage
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,520,542	982,421
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	382,340	213,851
Noncommercial | Construction and land development
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	120,097	122,792
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	912	2,583
Noncommercial | Revolving mortgage
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	2,561,800	2,113,285
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	74,109	30,834
Noncommercial | Consumer
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	1,117,454	386,452
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net	3,014	851
Noncommercial | Non-specific
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification	-15,772
Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	179,874	179,046		180,883
Reclassification		7,368	[1]
Provisions	15,260	19,289		42,046
Charge-offs	-20,499	-33,118		-50,208
Recoveries	8,202	7,289		6,325
Net charge-offs	-12,297	-25,829		-43,883
Ending balance	182,837	179,874		179,046
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	15,717	10,161
ALLL for loans and leases collectively evaluated for impairment	167,120	169,713
Total allowance for loan and lease losses	182,837	179,874		179,046
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	119,593	132,146
Loans and leases, not acquired in a transfer accounted for as debt securities	17,582,967	12,104,298
Non-PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,335	6,031		5,467
Reclassification		5,141	[1]
Provisions	1,735	2,809		9,665
Charge-offs	-316	-4,685		-9,546
Recoveries	207	1,039		445
Ending balance	11,961	10,335		6,031
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	92	103
ALLL for loans and leases collectively evaluated for impairment	11,869	10,232
Total allowance for loan and lease losses	11,961	10,335		6,031
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	1,620	2,272
Loans and leases collectively evaluated for impairment	548,948	317,575
Loans and leases, not acquired in a transfer accounted for as debt securities	550,568	319,847
Non-PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	100,257	80,229		67,486
Reclassification		27,421	[1]
Provisions	-16,746	-4,485		18,198
Charge-offs	-1,147	-3,904		-7,081
Recoveries	2,825	996		1,626
Ending balance	85,189	100,257		80,229
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	8,610	6,873
ALLL for loans and leases collectively evaluated for impairment	76,579	93,384
Total allowance for loan and lease losses	85,189	100,257		80,229
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	82,803	97,111
Loans and leases collectively evaluated for impairment	7,470,145	6,265,379
Loans and leases, not acquired in a transfer accounted for as debt securities	7,552,948	6,362,490
Non-PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,009	2,059		2,169
Reclassification		-815	[1]
Provisions	-401	-32		130
Charge-offs	0	-312		-254
Recoveries	124	109		14
Ending balance	732	1,009		2,059
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	112	209
ALLL for loans and leases collectively evaluated for impairment	620	800
Total allowance for loan and lease losses	732	1,009		2,059
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	584	1,878
Loans and leases collectively evaluated for impairment	244,291	176,876
Loans and leases, not acquired in a transfer accounted for as debt securities	244,875	178,754
Non-PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	22,362	14,050		23,723
Reclassification		7,551	[1]
Provisions	10,441	4,333		-4,982
Charge-offs	-3,014	-4,785		-5,472
Recoveries	938	1,213		781
Ending balance	30,727	22,362		14,050
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	1,743	771
ALLL for loans and leases collectively evaluated for impairment	28,984	21,591
Total allowance for loan and lease losses	30,727	22,362		14,050
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	11,040	9,300
Loans and leases collectively evaluated for impairment	1,977,894	1,071,858
Loans and leases, not acquired in a transfer accounted for as debt securities	1,988,934	1,081,158
Non-PCI Loans | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,749	3,521		3,288
Reclassification		-253	[1]
Provisions	-473	1,646		498
Charge-offs	-100	-272		-361
Recoveries	110	107		96
Ending balance	4,286	4,749		3,521
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	150	54
ALLL for loans and leases collectively evaluated for impairment	4,136	4,695
Total allowance for loan and lease losses	4,286	4,749		3,521
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	623	188
Loans and leases collectively evaluated for impairment	571,293	381,575
Loans and leases, not acquired in a transfer accounted for as debt securities	571,916	381,763
Non-PCI Loans | Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	190	1,175		1,315
Reclassification		-1,288	[1]
Provisions	3,007	308		-116
Charge-offs	-13	-6		-28
Recoveries	0	1		4
Ending balance	3,184	190		1,175
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	1,972	0
ALLL for loans and leases collectively evaluated for impairment	1,212	190
Total allowance for loan and lease losses	3,184	190		1,175
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	2,000	0
Loans and leases collectively evaluated for impairment	351,833	175,336
Loans and leases, not acquired in a transfer accounted for as debt securities	353,833	175,336
Non-PCI Loans | Noncommercial
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases, not acquired in a transfer accounted for as debt securities	6,319,893	3,604,950
Non-PCI Loans | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,511	3,836		8,879
Reclassification		5,717	[1]
Provisions	1,219	2,786		-782
Charge-offs	-1,260	-2,387		-4,790
Recoveries	191	559		529
Ending balance	10,661	10,511		3,836
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	1,360	1,586
ALLL for loans and leases collectively evaluated for impairment	9,301	8,925
Total allowance for loan and lease losses	10,661	10,511		3,836
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	14,913	15,539
Loans and leases collectively evaluated for impairment	2,505,629	966,882
Loans and leases, not acquired in a transfer accounted for as debt securities	2,520,542	982,421
Non-PCI Loans | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	681	1,721		1,427
Reclassification		-478	[1]
Provisions	245	-379		1,161
Charge-offs	-118	-392		-1,047
Recoveries	84	209		180
Ending balance	892	681		1,721
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	71	72
ALLL for loans and leases collectively evaluated for impairment	821	609
Total allowance for loan and lease losses	892	681		1,721
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	1,340	1,108
Loans and leases collectively evaluated for impairment	118,757	121,684
Loans and leases, not acquired in a transfer accounted for as debt securities	120,097	122,792
Non-PCI Loans | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,239	25,185		27,045
Reclassification		-9,838	[1]
Provisions	6,301	6,296		8,783
Charge-offs	-4,744	-6,064		-11,341
Recoveries	854	660		698
Ending balance	18,650	16,239		25,185
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	1,052	372
ALLL for loans and leases collectively evaluated for impairment	17,598	15,867
Total allowance for loan and lease losses	18,650	16,239		25,185
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	3,675	3,596
Loans and leases collectively evaluated for impairment	2,558,125	2,109,689
Loans and leases, not acquired in a transfer accounted for as debt securities	2,561,800	2,113,285
Non-PCI Loans | Noncommercial | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,541	25,389		25,962
Reclassification		-10,018	[1]
Provisions	9,932	6,085		7,763
Charge-offs	-9,787	-10,311		-10,288
Recoveries	2,869	2,396		1,952
Ending balance	16,555	13,541		25,389
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	555	121
ALLL for loans and leases collectively evaluated for impairment	16,000	13,420
Total allowance for loan and lease losses	16,555	13,541		25,389
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	995	1,154
Loans and leases collectively evaluated for impairment	1,116,459	385,298
Loans and leases, not acquired in a transfer accounted for as debt securities	1,117,454	386,452
Non-PCI Loans | Noncommercial | Non-specific
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	15,850		14,122
Reclassification		-15,772	[1]
Provisions	0	-78		1,728
Charge-offs	0	0		0
Recoveries	0	0		0
Ending balance	0	0		15,850
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	0	0		15,850
Loans Acquired With Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	53,520	139,972		89,261
Reclassification		0	[1]
Provisions	-14,620	-51,544		100,839
Charge-offs	-17,271	-34,908		-50,270
Recoveries	0	0		142
Net charge-offs	-17,271	-34,908		-50,128
Ending balance	21,629	53,520		139,972
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	21,629	53,520		139,972
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	21,629	53,520
Loans and leases acquired with deteriorated credit quality		1,029,426
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,320	31,186		16,693
Provisions	1,284	-22,942		23,160
Charge-offs	-2,454	-6,924		-8,667
Recoveries	0	0		0
Ending balance	150	1,320		31,186
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	150	1,320		31,186
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	150	1,320
Loans and leases acquired with deteriorated credit quality	78,079	78,915
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	29,906	50,275		39,557
Provisions	-7,903	-3,872		34,227
Charge-offs	-11,868	-16,497		-23,509
Recoveries	0	0		0
Ending balance	10,135	29,906		50,275
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	10,135	29,906		50,275
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	10,135	29,906
Loans and leases acquired with deteriorated credit quality	577,518	642,891
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,354	11,234		16,862
Provisions	-1,385	-8,949		-4,372
Charge-offs	106	-931		-1,256
Recoveries	0	0
Ending balance	75	1,354		11,234
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	75	1,354		11,234
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	75	1,354
Loans and leases acquired with deteriorated credit quality	40,193	41,381
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,275	8,897		5,500
Provisions	-2,023	470		11,839
Charge-offs	-2,012	-4,092		-8,442
Recoveries	0	0		0
Ending balance	1,240	5,275		8,897
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	1,240	5,275		8,897
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	1,240	5,275
Loans and leases acquired with deteriorated credit quality	27,254	17,254
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0		13
Provisions	0	0		-13
Charge-offs	0	0		0
Recoveries	0	0		0
Ending balance	0	0		0
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	0	0		0
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	0	0
Loans and leases acquired with deteriorated credit quality	0	0
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,802	19,837		5,433
Provisions	-5,576	-5,487		18,401
Charge-offs	-406	-2,548		-4,139
Recoveries	0	0		142
Ending balance	5,820	11,802		19,837
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	5,820	11,802		19,837
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	5,820	11,802
Loans and leases acquired with deteriorated credit quality	382,339	213,851
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	682	8,287		4,652
Provisions	-395	-4,170		6,520
Charge-offs	-104	-3,435		-2,885
Recoveries	0	0		0
Ending balance	183	682		8,287
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	183	682		8,287
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	183	682
Loans and leases acquired with deteriorated credit quality	912	2,583
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,959	9,754		77
Provisions	1,523	-6,399		10,796
Charge-offs	-483	-396		-1,119
Recoveries	0	0		0
Ending balance	3,999	2,959		9,754
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	3,999	2,959		9,754
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	3,999	2,959
Loans and leases acquired with deteriorated credit quality	74,109	30,834
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	222	502		474
Provisions	-145	-195		281
Charge-offs	-50	-85		-253
Recoveries	0	0		0
Ending balance	27	222		502
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	27	222		502
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	27	222
Loans and leases acquired with deteriorated credit quality	$6,094	$1,717
[1]	Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.

Allowance_for_Loan_and_Lease_L3

Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans And Leases, Growth	$907,800,000
Reclassification	0	7,368,000	[1]	0
Unpaid principal balance	2,057,691,000	1,833,955,000
Financing Receivable, Individually Evaluated for Impairment	119,593,000	132,146,000
Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	7,368,000
Noncommercial | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	-15,772,000
Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Credit Losses, Change During Period	1,700,000
Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		7,368,000	[1]
Unpaid principal balance	133,466,000	145,485,000
ALLL for loans and leases individually evaluated for impairment	15,717,000	10,161,000
Financing Receivable, Individually Evaluated for Impairment	119,593,000	132,146,000
Financing Receivable, Individually Evaluated for Impairment, Change During Period	-12,600,000
Average balance	127,421,000	151,330,000		158,426,000
Interest income recognized	5,427,000	7,817,000		6,735,000
Financing Receivable, Collectively Evaluated for Impairment, Change During Period	5,490,000,000
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		5,141,000	[1]
Unpaid principal balance	6,945,000	7,306,000
ALLL for loans and leases individually evaluated for impairment	92,000	103,000
Financing Receivable, Individually Evaluated for Impairment	1,620,000	2,272,000
Average balance	1,689,000	6,414,000		22,493,000
Interest income recognized	83,000	270,000		399,000
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		27,421,000	[1]
Unpaid principal balance	87,702,000	103,522,000
ALLL for loans and leases individually evaluated for impairment	8,610,000	6,873,000
Financing Receivable, Individually Evaluated for Impairment	82,803,000	97,111,000
Average balance	86,250,000	105,628,000		96,082,000
Interest income recognized	3,698,000	5,702,000		4,630,000
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-815,000	[1]
Unpaid principal balance	913,000	2,279,000
ALLL for loans and leases individually evaluated for impairment	112,000	209,000
Financing Receivable, Individually Evaluated for Impairment	584,000	1,878,000
Average balance	2,125,000	2,658,000		2,690,000
Interest income recognized	80,000	144,000		142,000
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		7,551,000	[1]
Unpaid principal balance	12,197,000	10,393,000
ALLL for loans and leases individually evaluated for impairment	1,743,000	771,000
Financing Receivable, Individually Evaluated for Impairment	11,040,000	9,300,000
Average balance	13,433,000	12,772,000		13,658,000
Interest income recognized	580,000	642,000		788,000
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-253,000	[1]
Unpaid principal balance	623,000	188,000
ALLL for loans and leases individually evaluated for impairment	150,000	54,000
Financing Receivable, Individually Evaluated for Impairment	623,000	188,000
Average balance	774,000	350,000		497,000
Interest income recognized	44,000	22,000		37,000
Non-PCI Loans | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-1,288,000	[1]
Unpaid principal balance	2,000,000
ALLL for loans and leases individually evaluated for impairment	1,972,000	0
Financing Receivable, Individually Evaluated for Impairment	2,000,000	0
Average balance	528,000	0		424,000
Interest income recognized	29,000	0		23,000
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		5,717,000	[1]
Unpaid principal balance	15,746,000	15,939,000
ALLL for loans and leases individually evaluated for impairment	1,360,000	1,586,000
Financing Receivable, Individually Evaluated for Impairment	14,913,000	15,539,000
Average balance	15,487,000	15,470,000		14,951,000
Interest income recognized	593,000	444,000		586,000
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-478,000	[1]
Unpaid principal balance	1,340,000	1,108,000
ALLL for loans and leases individually evaluated for impairment	71,000	72,000
Financing Receivable, Individually Evaluated for Impairment	1,340,000	1,108,000
Average balance	1,678,000	958,000		2,850,000
Interest income recognized	98,000	55,000		41,000
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-9,838,000	[1]
Unpaid principal balance	4,933,000	3,596,000
ALLL for loans and leases individually evaluated for impairment	1,052,000	372,000
Financing Receivable, Individually Evaluated for Impairment	3,675,000	3,596,000
Average balance	3,922,000	5,653,000		2,931,000
Interest income recognized	134,000	485,000		68,000
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-10,018,000	[1]
Unpaid principal balance	1,067,000	1,154,000
ALLL for loans and leases individually evaluated for impairment	555,000	121,000
Financing Receivable, Individually Evaluated for Impairment	995,000	1,154,000
Average balance	1,535,000	1,427,000		1,850,000
Interest income recognized	88,000	53,000		21,000
Non-PCI Loans | Noncommercial | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		-15,772,000	[1]
Non-PCI Loans | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment, Change During Period	2,000,000
Non-PCI Loans | With A Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	87,007,000	83,678,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	996,000	1,025,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	57,324,000	57,819,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	112,000	783,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	10,319,000	7,197,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	319,000	133,000
Non-PCI Loans | With A Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	2,000,000
Non-PCI Loans | With A Recorded Allowance | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	10,198,000	11,534,000
Non-PCI Loans | With A Recorded Allowance | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,077,000	651,000
Non-PCI Loans | With A Recorded Allowance | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	3,675,000	3,382,000
Non-PCI Loans | With A Recorded Allowance | Noncommercial | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	987,000	1,154,000
Non-PCI Loans | With No Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	32,586,000	48,468,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	624,000	1,247,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	25,479,000	39,292,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	472,000	1,095,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	721,000	2,103,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	304,000	55,000
Non-PCI Loans | With No Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0
Non-PCI Loans | With No Recorded Allowance | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	4,715,000	4,005,000
Non-PCI Loans | With No Recorded Allowance | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	263,000	457,000
Non-PCI Loans | With No Recorded Allowance | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0	214,000
Non-PCI Loans | With No Recorded Allowance | Noncommercial | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	8,000	0
Loans Acquired With Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		0	[1]
Acquired loans which have adverse change in expected cash flows	$285,636,000	$459,947,000
[1]	Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.

Allowance_for_Loan_and_Lease_L4

Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	loans	loans
Financing Receivable, Modifications [Line Items]
Accruing	$135,963,000	$175,955,000
Nonaccruing	15,516,000	30,801,000
Financing Receivable, Modifications, Recorded Investment	151,479,000	206,756,000
Impaired Loans and Leases, Baseline for Meaurement	500,000
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	248	148
Nonaccruing	44,005,000	53,170,000
Financing Receivable, Modifications, Recorded Investment	104,607,000	104,448,000
Commercial
Financing Receivable, Modifications [Line Items]
Accruing	107,305,000	147,712,000
Nonaccruing	10,861,000	26,681,000
Financing Receivable, Modifications, Recorded Investment	118,166,000	174,393,000
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	2,591,000	21,032,000
Nonaccruing	446,000	1,002,000
Financing Receivable, Modifications, Recorded Investment	3,037,000	22,034,000
Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	343,000	544,000
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	92,184,000	113,323,000
Nonaccruing	8,937,000	23,387,000
Financing Receivable, Modifications, Recorded Investment	101,121,000	136,710,000
Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	24,720,000	33,529,000
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing	2,374,000	3,470,000
Nonaccruing	449,000	1,150,000
Financing Receivable, Modifications, Recorded Investment	2,823,000	4,620,000
Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	619,000	1,610,000
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing	9,864,000	9,838,000
Nonaccruing	664,000	1,142,000
Financing Receivable, Modifications, Recorded Investment	10,528,000	10,980,000
Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,741,000	1,428,000
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Accruing	258,000	49,000
Nonaccruing	365,000	0
Financing Receivable, Modifications, Recorded Investment	623,000	49,000
Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	374,000	832,000
Commercial | Other
Financing Receivable, Modifications [Line Items]
Accruing	34,000	0
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	34,000	0
Noncommercial
Financing Receivable, Modifications [Line Items]
Accruing	28,658,000	28,243,000
Nonaccruing	4,655,000	4,120,000
Financing Receivable, Modifications, Recorded Investment	33,313,000	32,363,000
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	22,597,000	23,343,000
Nonaccruing	4,655,000	3,663,000
Financing Receivable, Modifications, Recorded Investment	27,252,000	27,006,000
Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	14,242,000	14,701,000
Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,966,000	0
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	1,391,000	651,000
Nonaccruing	0	457,000
Financing Receivable, Modifications, Recorded Investment	1,391,000	1,108,000
Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	457,000
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Accruing	3,675,000	3,095,000
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	3,675,000	3,095,000
Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing	995,000	1,154,000
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	$995,000	$1,154,000
Below Market Interest Rate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	137	77
Below Market Interest Rate | Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	11	3
Below Market Interest Rate | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	44	28
Below Market Interest Rate | Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	2
Below Market Interest Rate | Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	13	3
Below Market Interest Rate | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	41	21
Below Market Interest Rate | Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	12	4
Below Market Interest Rate | Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	5	13

Allowance_for_Loan_and_Lease_L5

Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	loans	loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$151,479	$206,756
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	118,166	174,393
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,037	22,034
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	101,121	136,710
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,823	4,620
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,528	10,980
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	623	49
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	34	0
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	33,313	32,363
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	27,252	27,006
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,391	1,108
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,675	3,095
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	104,607	104,448
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	12	13
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,180	1,080
Financing Receivable, Modifications, Number of Contracts	248	148
Financing Receivable, Modifications, Post-Modification Recorded Investment	30,869	24,787
Non-PCI Loans | Interest Only Loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	364	0
Financing Receivable, Modifications, Number of Contracts	12	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,375	2,547
Non-PCI Loans | Loan Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	63	23
Financing Receivable, Modifications, Post-Modification Recorded Investment	8,404	3,918
Non-PCI Loans | Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	486	746
Financing Receivable, Modifications, Number of Contracts	137	77
Financing Receivable, Modifications, Post-Modification Recorded Investment	17,345	15,235
Non-PCI Loans | Discharge of Debt
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	330	334
Financing Receivable, Modifications, Number of Contracts	36	38
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,745	3,087
Non-PCI Loans | Commercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	364	0
Financing Receivable, Modifications, Number of Contracts	6	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,973	1,520
Non-PCI Loans | Commercial | Interest Only Loan | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Non-PCI Loans | Commercial | Interest Only Loan | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	250	397
Non-PCI Loans | Commercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	187	0
Non-PCI Loans | Commercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	18	9
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,848	3,270
Non-PCI Loans | Commercial | Loan Term Extension | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	5	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,274	47
Non-PCI Loans | Commercial | Loan Term Extension | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	6	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	198	0
Non-PCI Loans | Commercial | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	11	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	372	609
Non-PCI Loans | Commercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	441	295
Financing Receivable, Modifications, Number of Contracts	44	28
Financing Receivable, Modifications, Post-Modification Recorded Investment	12,642	10,873
Non-PCI Loans | Commercial | Below Market Interest Rate | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	337	378
Non-PCI Loans | Commercial | Below Market Interest Rate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	13	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	751	851
Non-PCI Loans | Commercial | Discharge of Debt | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	949	0
Non-PCI Loans | Noncommercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	630
Non-PCI Loans | Noncommercial | Interest Only Loan | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	118	0
Non-PCI Loans | Noncommercial | Interest Only Loan | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	34	0
Non-PCI Loans | Noncommercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	19	11
Financing Receivable, Modifications, Post-Modification Recorded Investment	572	539
Non-PCI Loans | Noncommercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	7	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	226	0
Non-PCI Loans | Noncommercial | Loan Term Extension | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	6	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	99	62
Non-PCI Loans | Noncommercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	45	0
Financing Receivable, Modifications, Number of Contracts	41	21
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,444	1,235
Non-PCI Loans | Noncommercial | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	12	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	389	269
Non-PCI Loans | Noncommercial | Below Market Interest Rate | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	451
Financing Receivable, Modifications, Number of Contracts	5	13
Financing Receivable, Modifications, Post-Modification Recorded Investment	217	801
Non-PCI Loans | Noncommercial | Below Market Interest Rate | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	10	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	193	219
Non-PCI Loans | Noncommercial | Discharge of Debt | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	268	60
Financing Receivable, Modifications, Number of Contracts	12	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,067	510
Non-PCI Loans | Noncommercial | Discharge of Debt | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	62	0
Financing Receivable, Modifications, Number of Contracts	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	62	0
Non-PCI Loans | Noncommercial | Discharge of Debt | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	4	0
Non-PCI Loans | Noncommercial | Discharge of Debt | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	274
Financing Receivable, Modifications, Number of Contracts	17	31
Financing Receivable, Modifications, Post-Modification Recorded Investment	663	2,577
Loans Acquired With Deteriorated Credit Quality [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	46,872	102,308
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	15	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	214	12,059
Financing Receivable, Modifications, Number of Contracts	79	47
Financing Receivable, Modifications, Post-Modification Recorded Investment	12,206	24,477
Loans Acquired With Deteriorated Credit Quality [Member] | Interest Only Loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	2,889
Financing Receivable, Modifications, Number of Contracts	2	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	5,530
Loans Acquired With Deteriorated Credit Quality [Member] | Loan Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	53	5,277
Financing Receivable, Modifications, Number of Contracts	4	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	700	8,637
Loans Acquired With Deteriorated Credit Quality [Member] | Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	6	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	161	3,893
Financing Receivable, Modifications, Number of Contracts	47	26
Financing Receivable, Modifications, Post-Modification Recorded Investment	9,847	10,200
Loans Acquired With Deteriorated Credit Quality [Member] | Discharge of Debt
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	26	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,659	0
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Interest Only Loan | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	2,590
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	2,590
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	299
Financing Receivable, Modifications, Number of Contracts	2	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	2,880
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Interest Only Loan | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	21
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	1	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	332	2,247
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	157
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	157
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Loan Term Extension | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1,080
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	2	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	116	106
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	138	2,418
Financing Receivable, Modifications, Number of Contracts	16	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	5,783	7,513
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Below Market Interest Rate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	493
Loans Acquired With Deteriorated Credit Quality [Member] | Commercial | Other Concession | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	110
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	39
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	53	5,120
Financing Receivable, Modifications, Number of Contracts	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	317	5,153
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	51	0
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	23	1,475
Financing Receivable, Modifications, Number of Contracts	29	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,948	2,088
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Discharge of Debt | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	26	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,659	0
Loans Acquired With Deteriorated Credit Quality [Member] | Noncommercial | Other Concession
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$0	$110

Premises_and_Equipment_Major_C

Premises and Equipment (Major Classifications) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$1,785,582	$1,474,118
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	660,501	597,596
Property, Plant and Equipment, Net	1,125,081	876,522
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	295,090	204,259
Premises and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,045,718	875,511
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$444,774	$394,348

Premises_and_Equipment_Operati

Premises and Equipment (Operating Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Due 2014	$16,834,000
Due 2015	11,598,000
Due 2016	8,463,000
Due 2017	6,274,000
Due 2018	4,445,000
Due thereafter	40,112,000
Total minimum payments	87,726,000
Rent expense, net	18,500,000	21,400,000	23,600,000
Rent income	$2,700,000	$1,800,000	$1,700,000

Other_Real_Estate_Owned_Detail

Other Real Estate Owned (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Covered
Beginning Balance	$47,081	$102,577	$22,982
Additions	29,708	59,034
Sales	-38,753	-96,744
Writedowns	-10,853	-17,786
Other Real Estate Covered Transfers	-5,537
Noncovered
Beginning balance	36,898	43,513	70,454
Additions	36,574	33,908
Sales	-48,935	-36,168
Writedowns	-5,219	-4,355
Other Real Estate Non Covered Transfers	5,537
Total
Beginning balance	83,979	146,090
Additions	66,282	92,942
Sales	-87,688	-132,912
Writedowns	-16,072	-22,141
Other Real Estate Transfers	0
Ending balance	93,436	83,979
Bancorporation
Covered
Additions	1,300
Noncovered
Additions	34,000
Total
Additions	35,300
1st Financial
Covered
Additions	0
Noncovered
Additions	11,600
Total
Additions	$11,600

FDIC_Indemnification_Asset_Cha

FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$93,397	$270,192	$617,377
Additional receivable from acquisition	5,106	0	0
Accretion of discounts and premiums, net	-43,422	-85,651	-102,394
Receipt of payments from FDIC	1,286	-19,373	-251,972
Post-acquisition and other adjustments, net	-27,666	-71,771	7,181
Ending balance	$28,701	$93,397	$270,192

Deposits_Details

Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
FDIC Deposit Insurance Limit	$250,000
Time Deposits Greater than $250,000, Carrying Value	552,300,000	525,500,000
Deposits, by Type [Abstract]
Demand	8,086,784,000	5,241,817,000
Checking With Interest	4,560,565,000	2,445,972,000
Money market accounts	8,319,569,000	6,306,942,000
Savings	1,204,514,000	1,004,097,000
Time	3,507,145,000	2,875,238,000
Total deposits	25,678,577,000	17,874,066,000
Maturities of Time Deposits [Abstract]
2014	2,423,786,000
2015	701,043,000
2016	241,437,000
2017	96,949,000
2018	43,930,000
Thereafter	$0

ShortTerm_Borrowings_Details

Short-Term Borrowings (Details) (USD $)	Dec. 31, 2014	Oct. 01, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Short-term borrowings	$987,184,000		$511,418,000
Short-term borrowings from acquisitions		296,100,000
Repurchase agreements from business acquisitions		218,400,000
Other short-term debt from acquisitions		77,700,000
Master Notes [Member]
Short-term Debt [Line Items]
Short-term borrowings	410,258,000		411,907,000
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term borrowings	294,426,000		96,960,000
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term borrowings	80,000,000		0
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings	2,551,000		2,551,000
Unsecured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	750,000,000
Secured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	1,960,000,000
Subordinated Debt Obligations [Member]
Short-term Debt [Line Items]
Short-term borrowings	$199,949,000		$0

LongTerm_Obligations_Details

Long-Term Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Long-term Debt, Fiscal Year Maturity [Abstract]
2014	147,000
2015	0
2016	10,725,000
2017	136,104,000
2018	0
Thereafter	204,344,000
Total long-term obligations	351,320,000	510,769,000
Trust Preferred Securities	128,500,000
Junior Subordinated Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	132,939,000
Junior Subordinated Debt [Member] | Junior Subordinanted Debenture at 3 Month Libor Plus 1.75% Maturing June 30, 2036 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	96,392,000	96,392,000
Junior Subordinated Debt [Member] | Junior Subordinanted Debenture at 3 Month Libor Plus 1.75% Maturing June 30, 2036 [Member] | 3-month LIBOR [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	1.75%
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 25 Percent Maturing June 15 2034 [Member] [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	26,547,000	0
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 25 Percent Maturing June 15 2034 [Member] [Member] | 3-month LIBOR [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	2.25%
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 85 Percent Maturing April 7 2034 [Member] [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	10,000,000	0
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 85 Percent Maturing April 7 2034 [Member] [Member] | 3-month LIBOR [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	2.85%
Subordinated Debt [Member] | Subordinated Notes Payable At 5 Point 125 Percent Maturing June 1 2015 [Member]
Debt Instrument [Line Items]
Debt interest rate	5.13%
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	0	125,000,000
Subordinated Debt [Member] | Subordinated Notes Payable at 5.125% Maturing June 1, 2015 [Member]
Debt Instrument [Line Items]
Debt interest rate	8.00%
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	15,000,000	0
Capital Lease Obligations [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	3,150,000	6,515,000
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.88% and Maturing Through September 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	160,268,000	240,283,000
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.88% and Maturing Through September 2018 [Member] | Minimum
Debt Instrument [Line Items]
Debt interest rate	2.00%
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.88% and Maturing Through September 2018 [Member] | Maximum
Debt Instrument [Line Items]
Debt interest rate	3.58%
Federal Home Loan Bank Advances [Member] | Rates Ranging from 4.74% and Maturity of July 2017 [Member]
Debt Instrument [Line Items]
Debt interest rate	4.74%
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	10,000,000	10,000,000
Unamortized Acquisition Accounting Adjustments [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	-156,000	2,449,000
Other Long Term Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	30,119,000	$30,130,000

Estimated_Fair_Values_Narrativ

Estimated Fair Values (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated Fair Values [Line Items]
Investment securities available for sale	$7,171,917	$5,387,703
Liability transfers between Level 1 and Level 2	0	0
Asset transfers between Level 1 and Level 2	0	0
Liability transfers between Level 2 and Level 1	0	0
Asset transfers between Level 2 and Level 1	0	0
Fair value of investment securities with nonobservable inputs	0	0
Fair Value, Measurements, Recurring
Estimated Fair Values [Line Items]
Liability measured at fair value on nonrecurring basis	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Estimated Fair Values [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Fair Value
Estimated Fair Values [Line Items]
Investment securities available for sale	$7,171,917	$5,387,703
Minimum
Estimated Fair Values [Line Items]
Discounts for collateral value estimates due to estimated holding and selling costs (percent)	10.00%	10.00%
Maximum
Estimated Fair Values [Line Items]
Discounts for collateral value estimates due to estimated holding and selling costs (percent)	14.00%	14.00%

Estimated_Fair_Values_Estimate

Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$604,182		$533,599
Overnight investments	1,724,919		859,324
Investment securities available for sale	7,171,917		5,387,703
Investment securities held to maturity	518		907
Loans and Leases Receivable, Net Amount	18,564,999		12,900,330
FDIC Indemnification Asset	28,701		93,397		270,192	617,377
Income earned not collected	57,254		48,390
Servicing Asset	16,688		16		1,784
Deposits	25,678,577		17,874,066
Short-term borrowings	987,184		511,418
Long-term obligations	351,320		510,769
FDIC loss share payable	116,535		109,378
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	604,182		533,599
Overnight investments	1,724,919		859,324
Investment securities available for sale	7,171,917		5,387,703
Investment securities held to maturity	518		907
Loans held for sale	63,696		47,271
Loans and Leases Receivable, Net Amount	18,564,999		12,900,330
FDIC Indemnification Asset	28,701	[1]	93,397	[1]
Income earned not collected	57,254		48,390
Stock issued by Federal Home Loan Bank	39,113		40,819
Preferred stock	13,689		33,564
Servicing Asset	16,688		16
Deposits	25,678,577		17,874,066
Short-term borrowings	987,184		511,418
Long-term obligations	351,320		510,769
FDIC loss share payable	116,535		109,378
Accrued interest payable	8,194		6,737
Derivative Liability, Fair Value, Gross Liability	4,337		7,220
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	604,182		533,599
Overnight investments	1,724,919		859,324
Investment securities available for sale	7,171,917		5,387,703
Investment securities held to maturity	544		974
Loans held for sale	63,696		47,956
Loans and Leases Receivable, Net Amount	18,046,497		12,545,537
FDIC Indemnification Asset	18,218	[1]	38,438	[1]
Income earned not collected	57,254		48,390
Stock issued by Federal Home Loan Bank	39,113		40,819
Preferred stock	14,708		34,786
Servicing Asset	16,736		16
Deposits	25,164,683		17,898,570
Short-term borrowings	987,184		511,418
Long-term obligations	367,732		526,037
FDIC loss share payable	122,168		111,941
Accrued interest payable	8,194		6,737
Derivative Liability, Fair Value, Gross Liability	$4,337		$7,220
[1]	The fair value of the FDIC receivable excludes receivable related to accretable yield to be amortized in prospective periods.

Estimated_Fair_Values_Assets_A

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$7,171,917	$5,387,703
Loans held for sale	63,696	47,271
Fair Value, Measurements, Recurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	7,171,917	5,387,703
Loans held for sale	63,696
Interest rate swaps accounted for as cash flow hedges	4,337	7,220
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Loans held for sale	0
Interest rate swaps accounted for as cash flow hedges	0	0
Fair Value, Measurements, Recurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	7,171,917	5,387,703
Loans held for sale	63,696
Interest rate swaps accounted for as cash flow hedges	4,337	7,220
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Loans held for sale	0
Interest rate swaps accounted for as cash flow hedges	0	0
Fair Value, Measurements, Recurring | U.S. Treasury | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	2,629,670	373,437
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	2,629,670	373,437
Fair Value, Measurements, Recurring | U.S. Treasury | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Government Agency | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	908,817	2,544,229
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	908,817	2,544,229
Fair Value, Measurements, Recurring | Government Agency | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other [Member] | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	3,633,304	2,446,873
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other [Member] | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other [Member] | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	3,633,304	2,446,873
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Other Debt Obligations | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		830
Fair Value, Measurements, Recurring | Other Debt Obligations | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | Other Debt Obligations | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		830
Fair Value, Measurements, Recurring | Other Debt Obligations | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | Equity Securities | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		22,147
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		22,147
Fair Value, Measurements, Recurring | Equity Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | State, County, Municipal | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	126	187
Fair Value, Measurements, Recurring | State, County, Municipal | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | State, County, Municipal | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	126	187
Fair Value, Measurements, Recurring | State, County, Municipal | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$0	$0

Estimated_Fair_Values_Estimate1

Estimated Fair Values Estimated Fair Values (Fair Value Option) (Details) (Loans Held For Sale, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Loans Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$202
Fair Value Of Items For Which Fair Value Option Was Elected Assets	63,696
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets	62,996
Fair Value Option Aggregate Difference Assets	$700

Estimated_Fair_Values_Assets_A1

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset	$16,688	$16	$1,784
Fair Value, Measurements, Nonrecurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	73,170	77,817
Real Estate Acquired Through Foreclosure	40,714	20,526
Covered under loss share agreements in other real estate owned	17,664	37,587
Servicing Asset	13,562
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0	0
Real Estate Acquired Through Foreclosure	0	0
Covered under loss share agreements in other real estate owned	0	0
Servicing Asset	0
Fair Value, Measurements, Nonrecurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0	0
Real Estate Acquired Through Foreclosure	0	0
Covered under loss share agreements in other real estate owned	0	0
Servicing Asset	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	73,170	77,817
Real Estate Acquired Through Foreclosure	40,714	20,526
Covered under loss share agreements in other real estate owned	17,664	37,587
Servicing Asset	$13,562

Employee_Benefit_Plans_Narrati

Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2007	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$14,900,000	$14,100,000
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	448,716,000		536,956,000		536,956,000
Return On Plan Assets Over Last 15 Years			7.16%		7.16%
Employer contributions	0		0
Assumed discount rate (percent)	4.00%	4.75%	4.90%
Assumed rate of salary increases	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.25%	7.50%	7.50%
Return On Plan Assets Over Last 10 Years			8.24%		8.24%
Return Plan Assets Over Last 5 Years			10.48%		10.48%
Percent of employer match			75.00%	100.00%
Percentage of employee compensation matched			6.00%	6.00%
Additional contribution if employed at end of year				3.00%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation			136,425,000		136,425,000
Employer contributions			0
Assumed discount rate (percent)			4.35%
Assumed rate of salary increases			4.00%
Expected long-term rate of return on plan assets (percent)			7.50%
Percent of employer match					100.00%
Percentage of employee compensation matched					6.00%
Employee profit sharing contribution percentage					3.00%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized			1,100,000
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized			$16,400,000
401(k) Matching Range 1 [Member] | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match					100.00%
Percentage of employee compensation matched					3.00%
401(k) Matching Range 2 [Member] | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match					50.00%
Percentage of employee compensation matched					3.00%

Employee_Benefit_Plans_Funded_

Employee Benefit Plans (Funded Status Of Plans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
BancShares Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	$530,678	$580,938
Service cost	12,332	16,332	14,241
Interest cost	25,615	23,686	23,711
Actuarial (gain) loss	76,122	-74,060
Benefits paid	-17,102	-16,218
Benefit obligation at December 31	627,645	530,678	580,938
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	524,017	463,005
Actual return on plan assets	38,041	77,230
Employer contributions	0	0
Benefits paid	-17,102	-16,218
Fair value of plan assets, ending balance	544,956	524,017	463,005
Funded status	-82,689	-6,661
Bancorporation Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	137,452
Service cost	832
Interest cost	1,488
Actuarial (gain) loss	12,802
Benefits paid	-1,242
Benefit obligation at December 31	151,332
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	150,374
Actual return on plan assets	6,486
Employer contributions	0
Benefits paid	-1,242
Fair value of plan assets, ending balance	155,618
Funded status	$4,286

Employee_Benefit_Plans_Amounts

Employee Benefit Plans (Amounts Recognized in the Financial Statements) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Bancorporation Plan
Amounts recognized in the consolidated balance sheets
Other assets	$0
Other liabilities	4,286
Net asset (liability) recognized	4,286
Amount recognized in accumulated other comprehensive income
Net loss (gain)	9,123
Less prior service cost	0
Accumulated other comprehensive loss, excluding income taxes	9,123
BancShares Plan
Amounts recognized in the consolidated balance sheets
Other assets	0	0
Other liabilities	-82,689	-6,661
Net asset (liability) recognized	-82,689	-6,661
Amount recognized in accumulated other comprehensive income
Net loss (gain)	80,806	16,605
Less prior service cost	767	977
Accumulated other comprehensive loss, excluding income taxes	81,573	17,582
Actuarial loss	11,335
Prior service cost	210
Total	$11,545

Employee_Benefit_Plans_Net_Ben

Employee Benefit Plans (Net Benefit Cost) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total change in pension obligation, net of tax	$5,358	$17,195	$11,236
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	12,332	16,332	14,241
Interest cost	25,615	23,686	23,711
Expected return on assets	-31,269	-27,733	-28,478
Amortization of prior service cost	-210	-210	-210
Amortization of net actuarial loss	5,148	16,985	11,026
Total pension expense	12,036	29,480	20,710
Current year actuarial gain (loss)	-69,349	123,557	-44,315
Total change in pension obligation, net of tax	63,991	-140,752	33,079
Total recognized in net periodic benefit cost and other comprehensive income	76,027	-111,272	53,789
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	832
Interest cost	1,488
Expected return on assets	-2,807
Amortization of prior service cost	0
Amortization of net actuarial loss	0
Total pension expense	-487
Current year actuarial gain (loss)	-9,123
Total change in pension obligation, net of tax	9,123
Total recognized in net periodic benefit cost and other comprehensive income	$8,636

Employee_Benefit_Plans_Assumpt

Employee Benefit Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
BancShares Plan
Assumptions used to determine the benefit obligations
Discount rate	4.27%	4.90%
Rate of compensation increase	4.00%	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.90%	4.00%	4.75%
Rate of compensation increase	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.25%	7.50%
Bancorporation Plan
Assumptions used to determine the benefit obligations
Discount rate	4.27%
Rate of compensation increase	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.35%
Rate of compensation increase	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%

Employee_Benefit_Plans_Fair_Va

Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	544,956	524,017	$463,005
Actual % of Plan Assets	100.00%	100.00%
BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	544,956	524,017
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	393,578	380,540
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	151,378	143,477
BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	1.00%	1.00%
BancShares Plan | Cash and Cash Equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
BancShares Plan | Cash and Cash Equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	1.00%	1.00%
BancShares Plan | Cash and Cash Equivalents | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,854	2,517
BancShares Plan | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,854	2,517
BancShares Plan | Cash and Cash Equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	62.00%	62.00%
BancShares Plan | Equity Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	55.00%	55.00%
BancShares Plan | Equity Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%	65.00%
BancShares Plan | Equity Securities | Large capitalization | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	229,315	218,023
BancShares Plan | Equity Securities | Large capitalization | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	229,315	218,023
BancShares Plan | Equity Securities | Large capitalization | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | Large capitalization | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | Middle capitalization | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10,796	10,724
BancShares Plan | Equity Securities | Middle capitalization | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10,796	10,724
BancShares Plan | Equity Securities | Middle capitalization | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | Middle capitalization | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | Small capitalization | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	44,734	43,928
BancShares Plan | Equity Securities | Small capitalization | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	44,734	43,928
BancShares Plan | Equity Securities | Small capitalization | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | Small capitalization | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | International equity (developed) | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10,706	10,535
BancShares Plan | Equity Securities | International equity (developed) | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10,706	10,535
BancShares Plan | Equity Securities | International equity (developed) | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | International equity (developed) | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | International equity (emerging) | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	41,484	40,643
BancShares Plan | Equity Securities | International equity (emerging) | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	41,484	40,643
BancShares Plan | Equity Securities | International equity (emerging) | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Equity Securities | International equity (emerging) | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	28.00%	28.00%
BancShares Plan | Fixed Income Investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	25.00%	25.00%
BancShares Plan | Fixed Income Investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	40.00%	40.00%
BancShares Plan | Fixed Income Investments | Investment grade bonds | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	81,050	74,501
BancShares Plan | Fixed Income Investments | Investment grade bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | Investment grade bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	81,050	74,501
BancShares Plan | Fixed Income Investments | Investment grade bonds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | Intermediate bonds | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	53,806	48,746
BancShares Plan | Fixed Income Investments | Intermediate bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | Intermediate bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	53,806	48,746
BancShares Plan | Fixed Income Investments | Intermediate bonds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | High-yield corporate bonds | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,592	10,111
BancShares Plan | Fixed Income Investments | High-yield corporate bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | High-yield corporate bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,592	10,111
BancShares Plan | Fixed Income Investments | High-yield corporate bonds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | U. S. Treasury | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,550	4,395
BancShares Plan | Fixed Income Investments | U. S. Treasury | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,550	4,395
BancShares Plan | Fixed Income Investments | U. S. Treasury | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | U. S. Treasury | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | International emerging bond | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,930	10,119
BancShares Plan | Fixed Income Investments | International emerging bond | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Fixed Income Investments | International emerging bond | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,930	10,119
BancShares Plan | Fixed Income Investments | International emerging bond | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	9.00%	9.00%
BancShares Plan | Alternative investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
BancShares Plan | Alternative investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	10.00%	8.00%
BancShares Plan | Alternative investments | Commodities Investment | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	17,671	19,014
BancShares Plan | Alternative investments | Commodities Investment | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	17,671	19,014
BancShares Plan | Alternative investments | Commodities Investment | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Alternative investments | Commodities Investment | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
BancShares Plan | Alternative investments | Hedge Funds | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	32,468	30,761
BancShares Plan | Alternative investments | Hedge Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	32,468	30,761
BancShares Plan | Alternative investments | Hedge Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets
BancShares Plan | Alternative investments | Hedge Funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	155,618	150,374
Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	155,618
Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	143,938
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	11,680
Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Bancorporation Plan | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%
Actual % of Plan Assets	8.40%
Bancorporation Plan | Cash and Cash Equivalents | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,077
Bancorporation Plan | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,077
Bancorporation Plan | Cash and Cash Equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Bancorporation Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Bancorporation Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%
Actual % of Plan Assets	68.97%
Bancorporation Plan | Equity Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Bancorporation Plan | Equity Securities | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	107,333
Bancorporation Plan | Equity Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	107,333
Bancorporation Plan | Equity Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Bancorporation Plan | Equity Securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Bancorporation Plan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	22.62%
Bancorporation Plan | Debt Securities | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	35,208
Bancorporation Plan | Debt Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	23,528
Bancorporation Plan | Debt Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	11,680
Bancorporation Plan | Debt Securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0

Employee_Benefit_Plans_Project

Employee Benefit Plans (Projected Benefit Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$0
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	536,956,000	448,716,000
2014	19,648,000
2015	21,412,000
2016	23,133,000
2017	24,767,000
2018	26,381,000
2019-2023	157,292,000
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	136,425,000
2014	5,270,000
2015	5,594,000
2016	6,088,000
2017	6,679,000
2018	7,045,000
2019-2023	$42,155,000

Employee_Benefit_Plans_Present

Employee Benefit Plans (Present Value of Accrued Liability) (Details) (Executives Directors And Officer Of Acquired Entities [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Executives Directors And Officer Of Acquired Entities [Member]
Present Value Of Accrued Liabilitiy [Roll Forward]
Present value of accrued liability as of January 1	$23,960	$25,851
Executive compensation liability acquired from 1st Financial	1,455	0
Executive compensation liability acquired from Bancorporation	10,288	0
Benefit expense	2,682	1,151
Benefits paid	-2,431	-3,042
Benefits forfeited	0	0
Present value of accrued liability as of December 31	$35,954	$23,960

Other_Noninterest_Income_and_O2

Other Noninterest Income and Other Noninterest Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$207,842,000	$193,014,000	$179,315,000
Loans Acquired With Deteriorated Credit Quality [Member]
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	16,200,000	29,700,000	10,500,000
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,834,000	10,033,000	11,131,000
Cardholder Reward Programs
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,435,000	10,154,000	4,325,000
Processing Fees Paid To Third Parties
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	17,089,000	15,095,000	14,454,000
Cardholder Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,950,000	9,892,000	11,816,000
Merchant Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	39,874,000	35,279,000	33,313,000
Collection
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,595,000	21,209,000	25,591,000
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,168,000	9,740,000	3,914,000
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,461,000	8,286,000	3,897,000
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$83,436,000	$73,326,000	$70,874,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense
Federal	$84,430	$46,848	$89,939
State	13,941	7,080	9,212
Total current tax expense	98,371	53,928	99,151
Deferred Income Tax Expense (Benefit)
Federal	-30,658	38,731	-26,501
State	-2,681	8,915	-7,921
Total deferred tax expense (benefit)	-33,339	47,646	-34,422
Total income tax expense	65,032	101,574	64,729
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory rate	35.00%
Income taxes at statutory rates	71,258	93,956	68,993
Increase (reduction) in income taxes resulting from: [Abstract]
Nontaxable income on loans, leases and investments, net of nondeductible expenses	-1,832	-1,185	-1,309
State and local income taxes, including change in valuation allowance, net of federal income tax benefit	7,319	10,397	839
Effective Income Tax Rate Reconciliation, Acquisition Stock Settlement, Amount	-10,185	0	0
Tax credits	-2,896	-960	-2,372
Other, net	1,368	-634	-1,422
Total income tax expense	65,032	101,574	64,729
Deferred Tax Assets, Net [Abstract]
Allowance for loan and lease losses	79,537	90,790
Pension liability	15,391	2,593
Executive separation from service agreements	23,849	9,321
State operating loss carryforwards	29	36
Unrealized loss on cash flow hedge	1,673	2,786
Net unrealized loss on securities included in accumulated other comprehensive loss	0	6,541
Deferred Tax Assets, Property, Plant and Equipment	5,550	0
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences, Amount	71,219	42,016
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	15,326	6,958
Other	25,746	10,569
Gross deferred tax asset	238,320	171,610
Accelerated depreciation	0	4,382
Lease financing activities	10,762	10,216
Net unrealized gain on securities included in accumulated other comprehensive loss	3,245	0
Net deferred loan fees and costs	4,772	4,302
Intangible assets	7,729	17,558
Deferred Tax Liability, Mark to Market Section 475, Amount	34,289	0
Other	11,395	4,564
Deferred tax liability	72,192	41,022
Net deferred tax assets	$166,128	$130,588

Transactions_with_Related_Pers2

Transactions with Related Persons (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$1,825,000
New loans	39,000
Repayments	-819,000
Ending balance	1,045,000	1,825,000
Unfunded loan commitments available to related parties	1,300,000	5,500,000
Revenue from related parties	17,200,000	21,600,000	33,700,000
Revenue from largest individual institution related parties	16,800,000	20,400,000	22,800,000
Investment Securities Available For Sale Related Parties	25,000,000	21,600,000
Investment Cost Related Parties	$23,000,000	$452,000

Derivatives_Narrative_Details

Derivatives (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Fair value of collateral pledged to secure interest rate contracts	$7,005
Incremental interest expense paid to interest rate swap counterparties	3,321	3,281	3,095
Interest Rate Swap
Derivative [Line Items]
Gain (loss) expected to be reclassified in next 12 months	-2,193
2011 Interest Rate Swap
Derivative [Line Items]
Notional amount of interest rate derivatives	$93,500
Fixed rate payments, interest rate	5.50%	5.50%	5.50%
Variable rate payment rate	1.75%	1.75%	1.75%

Derivatives_Schedule_Of_Intere

Derivatives (Schedule Of Interest Rate Swaps) (Details) (2011 Interest Rate Swap, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
2011 Interest Rate Swap
Derivative [Line Items]
Estimated fair value of liability	$4,337	$7,220
Derivative, Notional Amount	$93,500	$93,500

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2014	Oct. 02, 2014
	Rate
Servicing Asset at Amortized Cost [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	14.25%
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	$1,300,000	$300,000	$600,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans	56,020
Beginning Balance, Servicing Asset	16,000	1,784,000		16,000
Amortization	-919,000	-205,000	-2,600,000
Servicing Asset at Fair Value, Additions	727,000	0
Servicing assets sold	0	-1,563,000
Valuation Allowance	-850,000	0	-302,000
Servicing Asset at Fair Value, Amount		16,000
Ending Balance, Servicing Asset	16,688,000	16,000	1,784,000
Goodwill [Roll Forward]
Beginning goodwill	102,625,000			102,625,000
Ending goodwill	139,773,000	102,625,000
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	1,247,000	3,556,000		1,247,000
Amortization	-6,955,000	-2,309,000	-3,476,000
Ending balance	89,922,000	1,247,000	3,556,000
Finite-Lived Intangible Assets [Abstract]
Gross balance	114,596,000	18,966,000
Accumulated amortization	-24,674,000	-17,719,000
Carrying value	89,922,000	1,247,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	18,576,000
2016	16,200,000
2017	13,951,000
2018	11,701,000
2019	9,457,000
1st Financial
Servicing Asset at Amortized Cost [Line Items]
Finite-Lived Core Deposits, Gross	3,800,000
Servicing Asset at Fair Value, Additions	148,000	0
Goodwill [Roll Forward]
Goodwill acquired	32,915,000	0		32,915,000
Useful life	3 months
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	3,780,000	0
Bancorporation
Servicing Asset at Amortized Cost [Line Items]
Finite-Lived Core Deposits, Gross	88,000,000
Servicing Asset at Fair Value, Additions	17,566,000	0
Goodwill [Roll Forward]
Goodwill acquired	4,233,000	0			4,233,000
Useful life	5 years 6 months
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	$91,850,000	$0
Conventional fixed loans
Servicing Asset at Amortized Cost [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	7.20%
All loans and leases excluding conventional fixed loans [Member]
Servicing Asset at Amortized Cost [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	9.20%
Core deposits | Minimum
Goodwill [Roll Forward]
Useful life	1 year
Core deposits | Maximum
Goodwill [Roll Forward]
Useful life	10 years

Shareholders_Equity_Dividends_2

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%
Leverage Capital Required Ratio To Tangible Assets	3.00%
Trust Preferred Securities	$128,500,000
Percent Of Trust Preferred Securities Excluded From Tier One Starting In 2013	75.00%
Remaining Percent of Trust Preferred Securities Excluded from Tier One After 2015	25.00%
Tier 2 capital	9,000,000	25,000,000
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency	1,480,000,000
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status	672,400,000
Average Required Maintence Of Non Interst Bearing Reserve Balance	382,700,000
Common Class A [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock	1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	100,000
Stock Repurchased During Period, Shares		1,973
Class B Common Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock	16
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	25,000
Stock Repurchased and Retired During Period, Shares	45,900
Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries	82,419,000	131,006,000	179,588,000
BancShares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	2,690,324,000	2,103,926,000
Capital Required for Capital Adequacy	2,904,123,000	2,315,579,000
Leverage Capital Required for Capital Adequacy	2,690,324,000	2,103,926,000
Tier 1 Risk Based Capital to Risk Weighted Assets	13.61%	14.89%
Capital to Risk Weighted Assets	14.69%	16.39%
Leverage Capital to Average Assets	8.91%	9.80%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	10.00%	10.00%
Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
FCB-SC [Member] [Domain]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	653,515,000	734,218,000
Capital Required for Capital Adequacy	657,475,000	787,962,000
Leverage Capital Required for Capital Adequacy	653,515,000	734,218,000
Tier 1 Risk Based Capital to Risk Weighted Assets	15.11%	17.09%
Capital to Risk Weighted Assets	15.20%	18.34%
Leverage Capital to Average Assets	7.89%	9.12%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	10.00%	10.00%
Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
FCB-SC [Member] [Domain] | Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries	52,397,000
FCB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	2,019,595,000	1,978,136,000
Capital Required for Capital Adequacy	2,212,163,000	2,179,248,000
Leverage Capital Required for Capital Adequacy	2,019,595,000	1,978,136,000
Tier 1 Risk Based Capital to Risk Weighted Assets	13.12%	14.10%
Capital to Risk Weighted Assets	14.37%	15.54%
Leverage Capital to Average Assets	9.30%	9.34%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	10.00%	10.00%
Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
FCB [Member] | Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries	$30,022,000	$131,006,000	$179,588,000

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]
FDIC loss share receivable	28,701,000	$93,397,000	$270,192,000	$617,377,000
FDIC loss share payable	116,535,000	109,378,000
Commitments to Extend Credit
Guarantor Obligations [Line Items]
Unused commitments	7,190,000,000	5,840,000,000
Affordable Housing Program Obligation	16,800,000	19,800,000
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor obligations amount	77,374,000	54,811,000
Recourse Obligation on Mortgage Loans Sold
Guarantor Obligations [Line Items]
Recourse Period, Maximum1	120 days
Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Reserve for estimated losses arising from repurchase of loans	3,203,000	$3,641,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), before Tax	($86,690)		($41,434)
Long-term obligations	710,097		740,186		914,688
Deferred tax expense (benefit)	-33,709		-16,166
Accumulated other comprehensive income (loss), net of tax	-52,981		-25,268		-82,106
Income taxes	-65,032		-101,574		-64,729
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-21,146	[1]	-10,506	[1]
Securities gains (losses)	29,096		0		2,277
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), before Tax	8,343		-16,632
Deferred tax expense (benefit)	3,245		-6,541
Accumulated other comprehensive income (loss), net of tax	5,098	[2]	-10,091	[2]	20,517	[2]
Income taxes	11,224	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-17,872	[1],[2]	0	[2]
Securities gains (losses)	-29,096	[1]
Funded Status of Defined Benefit Plan
Accumulated Other Comprehensive Income (Loss), before Tax	-90,696		-17,582
Deferred tax expense (benefit)	-35,281		-6,839
Accumulated other comprehensive income (loss), net of tax	-55,415	[2]	-10,743	[2]	-96,331	[2]
Income taxes	2,084	[1]	6,689	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-3,274	[1],[2]	-10,506	[1],[2]
Employee Benefits, prior service costs	-210	[1]	-210	[1]
Reclassification adjustment for losses included in income before income taxes	-5,148	[1]	-16,985	[1]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	-5,358		-17,195	[1]
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), before Tax	-4,337		-7,220
Deferred tax expense (benefit)	-1,673		-2,786
Accumulated other comprehensive income (loss), net of tax	-2,664	[2]	-4,434	[2]	-6,292	[2]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$0	[2]	$0	[2]
[1]	(Dollars in thousands)B Year ended December 31, 2014Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $(29,096)B Securities gains 11,224B Income taxes $(17,872)B Net income Amortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (5,148)B Employee benefits (5,358)B Income before income taxes 2,084B Income taxes $(3,274)B Net incomeTotal reclassifications for the periodB $(21,146) Year ended December 31, 2013Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedAmortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (16,985)B Employee benefits (17,195)B Income before income taxes 6,689B Income taxes $(10,506)B Net incomeTotal reclassifications for the periodB $(10,506) (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss (Components of AOCI) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	($25,268)		($82,106)
Other comprehensive income (loss) before reclassifications	-48,859		46,332
Amounts reclassified from accumulated other comprehensive loss	21,146	[1]	10,506	[1]
Net current period other comprehensive income (loss)	-27,713		56,838		-15,532
Ending balance	-52,981		-25,268		-82,106
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	-4,434	[2]	-6,292	[2]
Other comprehensive income (loss) before reclassifications	1,770	[2]	1,858	[2]
Amounts reclassified from accumulated other comprehensive loss	0	[2]	0	[2]
Net current period other comprehensive income (loss)	1,770	[2]	1,858	[2]
Ending balance	-2,664	[2]	-4,434	[2]
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	-10,091	[2]	20,517	[2]
Other comprehensive income (loss) before reclassifications	-2,683	[2]	-30,608	[2]
Amounts reclassified from accumulated other comprehensive loss	17,872	[1],[2]	0	[2]
Net current period other comprehensive income (loss)	15,189	[2]	-30,608	[2]
Ending balance	5,098	[2]	-10,091	[2]
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	-10,743	[2]	-96,331	[2]
Other comprehensive income (loss) before reclassifications	-47,946	[2]	75,082	[2]
Amounts reclassified from accumulated other comprehensive loss	3,274	[1],[2]	10,506	[1],[2]
Net current period other comprehensive income (loss)	-44,672	[2]	85,588	[2]
Ending balance	($55,415)	[2]	($10,743)	[2]
[1]	(Dollars in thousands)B Year ended December 31, 2014Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $(29,096)B Securities gains 11,224B Income taxes $(17,872)B Net income Amortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (5,148)B Employee benefits (5,358)B Income before income taxes 2,084B Income taxes $(3,274)B Net incomeTotal reclassifications for the periodB $(21,146) Year ended December 31, 2013Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedAmortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (16,985)B Employee benefits (17,195)B Income before income taxes 6,689B Income taxes $(10,506)B Net incomeTotal reclassifications for the periodB $(10,506) (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Long-term obligations	$710,097		$740,186		$914,688
Securities gains (losses)	29,096		0		2,277
Income taxes	-65,032		-101,574		-64,729
Amounts reclassified from accumulated other comprehensive income, net of tax	21,146	[1]	10,506	[1]
Unrealized Loss on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income, net of tax	0	[2]	0	[2]
Unrealized Gains on Investment Securities Available for Sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	-29,096	[1]
Income taxes	11,224	[1]
Amounts reclassified from accumulated other comprehensive income, net of tax	17,872	[1],[2]	0	[2]
Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Employee Benefits, prior service costs	-210	[1]	-210	[1]
Reclassification adjustment for losses included in income before income taxes	-5,148	[1]	-16,985	[1]
Total before taxes	-5,358		-17,195	[1]
Income taxes	2,084	[1]	6,689	[1]
Amounts reclassified from accumulated other comprehensive income, net of tax	$3,274	[1],[2]	$10,506	[1],[2]
[1]	(Dollars in thousands)B Year ended December 31, 2014Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $(29,096)B Securities gains 11,224B Income taxes $(17,872)B Net income Amortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (5,148)B Employee benefits (5,358)B Income before income taxes 2,084B Income taxes $(3,274)B Net incomeTotal reclassifications for the periodB $(21,146) Year ended December 31, 2013Details about accumulated other comprehensive lossB Amount reclassified from accumulated other comprehensive income (loss)(1)B Affected line item in the statement where net income is presentedAmortization of defined benefit pension items Prior service costsB $(210)B Employee benefitsActuarial lossesB (16,985)B Employee benefits (17,195)B Income before income taxes 6,689B Income taxes $(10,506)B Net incomeTotal reclassifications for the periodB $(10,506) (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Parent_Company_Financial_State2

Parent Company Financial Statements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Investment securities	$7,171,917,000	$5,387,703,000
Other assets	394,027,000	258,568,000
Total assets	30,075,113,000	21,193,878,000
Liabilities and Shareholders' Equity
Short-term borrowings	987,184,000	511,418,000
Long-term obligations	351,320,000	510,769,000
Other liabilities	253,903,000	116,785,000
Stockholders' equity	2,687,594,000	2,071,462,000	1,859,624,000	1,861,128,000
Total liabilities and shareholders' equity	30,075,113,000	21,193,878,000
Income Statement [Abstract]
Interest expense	50,351,000	56,618,000	90,148,000
Net interest income (loss)	710,097,000	740,186,000	914,688,000
Income tax benefit	65,032,000	101,574,000	64,729,000
Net income	138,562,000	166,869,000	132,395,000
OPERATING ACTIVITIES
Net income	138,562,000	166,869,000	132,395,000
Net amortization of premiums and accretion of discounts	-48,374,000	-112,759,000	-156,796,000
Gain on elimination of acquired debt	-1,988,000	0	0
Securities (gains) losses	-29,096,000	0	-2,277,000
Gain on sale of other assets	0	-4,085,000	0
Other than temporary impairment on securities	0
Change in other assets	-72,680,000	100,437,000	-21,414,000
Change in other liabilities	1,319,000	49,177,000	-77,590,000
INVESTING ACTIVITIES
Net change in short-term borrowings	-25,321,000	-57,087,000	-101,717,000
Retirement of long-term obligations	-54,301,000	-4,152,000	-196,338,000
Stock issuance costs	-619,000	0	0
Repurchase of common stock	0	-321,000	-103,624,000
Cash dividends paid	-11,543,000	-8,663,000	-15,398,000
Net change in cash	70,583,000	-106,131,000	48,929,000
Cash and due from banks at beginning of period	533,599,000	639,730,000	590,801,000
Cash and due from banks at end of period	604,182,000	533,599,000	639,730,000
Cash payments for
Interest	48,894,000	59,234,000	104,514,000
Income taxes	127,970,000	102,890,000	66,453,000
Parent
Assets
Cash	24,026,000	13,047,000
Investment securities	110,644,000	234,488,000
Investment in subsidiaries	2,815,866,000	2,053,292,000
Due from subsidiaries	295,994,000	145,666,000
Other assets	74,157,000	144,998,000
Total assets	3,320,687,000	2,591,491,000
Liabilities and Shareholders' Equity
Short-term borrowings	485,207,000	411,907,000
Long-term obligations	136,717,000	96,392,000
Other liabilities	11,169,000	11,730,000
Stockholders' equity	2,687,594,000	2,071,462,000
Total liabilities and shareholders' equity	3,320,687,000	2,591,491,000
Income Statement [Abstract]
Interest income	1,784,000	1,387,000	1,353,000
Interest expense	9,694,000	7,065,000	15,435,000
Net interest income (loss)	-7,910,000	-5,678,000	-14,082,000
Dividends from subsidiaries	82,419,000	131,006,000	179,588,000
Other income (loss)	33,600,000	3,620,000	2,843,000
Other operating expense	6,534,000	2,344,000	6,384,000
Income before income tax benefit and equity in undistributed net income of subsidiaries	101,575,000	126,604,000	161,965,000
Income tax benefit	-2,590,000	-2,095,000	-8,417,000
Income before equity in undistributed net income of subsidiaries	104,165,000	128,699,000	170,382,000
Excess distributions (undistributed ) net income of subsidiaries	-34,397,000	-38,170,000	37,987,000
Net income	138,562,000	166,869,000	132,395,000
OPERATING ACTIVITIES
Net income	138,562,000	166,869,000	132,395,000
Excess distributions (undistributed ) net income of subsidiaries	-34,397,000	-38,170,000	37,987,000
Net amortization of premiums and accretion of discounts	594,000	334,000	439,000
Gain on elimination of acquired debt	-1,988,000	0	0
Securities (gains) losses	-29,126,000	0	-2,274,000
Gain on sale of other assets	0	-1,331,000	0
Other than temporary impairment on securities	0	0	45,000
Change in other assets	93,385,000	-61,704,000	30,761,000
Change in other liabilities	2,250,000	-2,096,000	-10,148,000
Net cash provided by (Used in) Operating Activities	169,280,000	63,902,000	189,205,000
INVESTING ACTIVITIES
Net change in due from subsidiaries	-150,328,000	-67,154,000	42,323,000
Purchases of investment securities	-33,243,000	-126,197,000	-111,409,000
Maturities and sales of investment securities	114,208,000	135,000,000	112,625,000
Investment in subsidiaries	1,579,000	1,489,000	9,298,000
Business acquisitions, net of cash acquired	-24,772,000	0	0
Net Cash Provided by (Used in) Investing Activities	-92,556,000	-56,862,000	52,837,000
Net change in short-term borrowings	-1,211,000	12,860,000	23,651,000
Retirement of long-term obligations	-52,372,000	0	-155,305,000
Stock issuance costs	-619,000	0	0
Repurchase of common stock	0	-321,000	-103,624,000
Cash dividends paid	-11,543,000	-8,663,000	-15,398,000
Net cash used by financing activities	-65,745,000	3,876,000	-250,676,000
Net change in cash	10,979,000	10,916,000	-8,634,000
Cash and due from banks at beginning of period	13,047,000	2,131,000	10,765,000
Cash and due from banks at end of period	24,026,000	13,047,000	2,131,000
Cash payments for
Interest	5,079,000	6,904,000	25,574,000
Income taxes	$127,970,000	$102,890,000	$66,453,000