First Citizens BancShares (FCNCA) 10-K 24 Feb 16 2015 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 24, 2016	Jun. 30, 2015
Entity Registrant Name	FIRST CITIZENS BANCSHARES INC /DE/
Entity Central Index Key	798,941
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
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			$ 1,930,557,160
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 ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 534,086	$ 604,182
Overnight investments	2,063,132	1,724,919
Investment securities available for sale	6,861,293	7,171,917
Investment securities held to maturity	255	518
Loans Receivable Held-for-sale, Amount	59,766	63,696
Loans and leases:
Purchased credit-impaired (PCI)	950,516	1,186,498
Non-PCI	19,289,474	17,582,967
Less allowance for loan and lease losses	(206,216)	(204,466)
Net Loans and Leases	20,033,774	18,564,999
Loans and Leases Receivable, Gross	20,239,990	18,769,465
Premises and equipment	1,135,829	1,125,081
Other real estate owned:
Other Real Estate, Covered	6,817	22,982
Other Real Estate, Non Covered	58,742	70,454
Income earned not collected	70,036	57,254
FDIC loss share receivable	4,054	28,701
Goodwill	139,773	139,773
Intangible Assets, Net (Excluding Goodwill)	90,986	106,610
Other assets	417,391	394,027
Total assets	31,475,934	30,075,113
Liabilities
Noninterest-bearing	9,274,470	8,086,784
Interest-bearing	17,656,285	17,591,793
Total deposits	26,930,755	25,678,577
Debt, Current	594,733	987,184
Long-term obligations	704,155	351,320
FDIC loss share payable	126,453	116,535
Other liabilities	247,729	253,903
Total liabilities	28,603,825	27,387,519
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,265,621	2,069,647
Accumulated other comprehensive loss	(64,440)	(52,981)
Total shareholders' equity	2,872,109	2,687,594
Total liabilities and shareholders' equity	31,475,934	30,075,113
Class A Common Stock
Shareholders' Equity
Common stock	11,005	11,005
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Amortized Cost Basis	$ 6,885,797	$ 7,163,574
Class A Common Stock
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shared authorized	16,000,000	16,000,000
Common stock, shares issued	11,005,220	11,005,220
Common stock, shares outstanding	11,005,220	11,005,220
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	1,005,185
Common stock, shares outstanding	1,005,185	1,005,185
Mortgage Backed Securities, Other
Available-for-sale Securities, Amortized Cost Basis	$ 4,692,447	$ 3,628,187
Held-to-maturity Securities, Fair Value	$ 265	$ 544

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Loans and leases	$ 874,892	$ 700,525	$ 757,197
Investment securities:
U. S. Treasury	15,353	11,656	1,645
Government agency	6,843	7,410	12,265
Residential mortgage-backed securities	65,815	36,492	22,642
State, county and municipal	33	13	12
Other	206	640	320
Total investment securities interest and dividend income	88,250	56,211	36,884
Overnight investments	6,067	3,712	2,723
Total interest income	969,209	760,448	796,804
Interest expense
Deposits	21,230	24,786	34,495
Short-term borrowings	4,660	9,177	2,724
Long-term obligations	18,414	16,388	19,399
Total interest expense	44,304	50,351	56,618
Net interest income (loss)	924,905	710,097	740,186
Provision for loan and lease losses	20,664	640	(32,255)
Net interest income after provision for loan and lease losses	904,241	709,457	772,441
Noninterest income
Gain on acquisition	42,930	0	0
Cardholder and merchant services	77,342	59,607	48,360
Merchant Discount Fees	84,207	64,075	56,024
Service charges on deposit accounts	90,546	69,100	60,661
Wealth management services	82,865	66,115	59,628
Fees from processing services	180	17,989	22,821
Securities gains (losses)	10,817	29,096	0
Other service charges and fees	23,807	17,760	15,696
Mortgage income	18,168	5,828	11,065
Insurance commissions	11,757	11,129	10,694
ATM income	7,119	5,388	5,026
Adjustments to FDIC receivable	(19,009)	(32,151)	(72,342)
Other	36,359	29,277	49,749
Total noninterest income	467,088	343,213	267,382
Noninterest expense
Salaries and wages	429,742	349,279	308,936
Employee benefits	113,309	79,898	90,479
Occupancy expense	98,191	86,775	75,713
Equipment expense	92,639	79,084	75,538
FDIC insurance expense	18,340	12,979	10,175
Foreclosure-related expenses	2,662	17,368	17,134
Merger-related expenses	14,174	13,064	391
Other	269,858	210,629	193,014
Total noninterest expense	1,038,915	849,076	771,380
Income before income taxes	332,414	203,594	268,443
Income taxes	122,028	65,032	101,574
Income taxes	121,478	98,371	53,928
Net income	$ 210,386	$ 138,562	$ 166,869
Average shares outstanding (in shares)	12,010,405	10,221,721	9,618,952
Cash dividends (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Net income per share	$ 17.52	$ 13.56	$ 17.35

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 210,386	$ 138,562	$ 166,869
Unrealized gains (losses) on securities:
Change in unrealized securities gains (losses) arising during period	(22,030)	54,071	(50,441)
Tax effect	8,486	(21,010)	19,833
Reclassification adjustment for net gains realized and included in income before income taxes	(10,817)	(29,096)	0
Tax effect	4,138	11,224	0
Total change in unrealized gains (losses) on securities, net of tax	(20,223)	15,189	(30,608)
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	2,908	2,883	3,178
Tax effect	(1,136)	(1,113)	(1,320)
Total change in unrecognized loss on cash flow hedges, net of tax	1,772	1,770	1,858
Change in pension obligation:
Change in pension obligation	691	(78,472)	123,557
Tax effect	(297)	30,526	(48,475)
Amortization of actuarial losses and prior service cost	11,586	5,358	17,195
Tax effect	(4,988)	(2,084)	(6,689)
Total change in pension obligation, net of tax	6,992	(44,672)	85,588
Net current period other comprehensive (loss) income	(11,459)	(27,713)	56,838
Total comprehensive income	$ 198,927	$ 110,849	$ 223,707

Consolidated Statements of Chan

Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock	Common StockClass A Common Stock	Common StockClass B Common Stock	Surplus	SurplusClass A Common Stock	SurplusClass B Common Stock	Retained Earnings [Member]	Retained Earnings [Member]Class A Common Stock	Retained Earnings [Member]Class B Common Stock	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossClass A Common Stock	Accumulated Other Comprehensive LossClass B Common Stock
Beginning 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		$ 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 of common stock shares		$ (36,308)	$ (9,777)	$ 0	(168)	(46)		$ (36,140)	$ (9,731)		$ 0	$ 0		$ 0	$ 0
Repurchase and retirement of common stock	46,085
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	210,386				0	0	0			210,386			0
Net current period other comprehensive income	(11,459)				0	0	0			0			(11,459)
Repurchase and retirement of common stock	0
Cash dividends	(14,412)				0	0	0			(14,412)			0
Ending balance at Dec. 31, 2015	$ 2,872,109				$ 11,005	$ 1,005	$ 658,918			$ 2,265,621			$ (64,440)

Consolidated Statements of Cha7

Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share) | $ / shares	$ 1.20
Stock issuance costs | $	$ 0
Class B Common Stock
Statement of Stockholders' Equity [Abstract]
Stock Repurchased and Retired During Period, Shares | shares	0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income	$ 210,386	$ 138,562	$ 166,869
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	20,664	640	(32,255)
Deferred tax expense (benefit)	550	(33,339)	47,646
Change in current taxes payable	(19,477)	72,274	(79,173)
Depreciation	87,717	75,481	70,841
Change in accrued interest payable	(2,481)	1,457	(2,616)
Change in income earned not collected	(12,782)	6,402	(724)
Business Combination, Bargain Purchase, Gain Recognized, Amount	(42,930)	0	0
Gain (Loss) on Disposition of Business	(216)	0	0
Gain on sale of other assets	0	0	(4,085)
Securities losses (gains)	(10,817)	(29,096)	0
Origination of loans held for sale	(685,631)	(377,993)	(393,908)
Proceeds from sale of loans held for sale	701,412	398,719	443,708
Gain on sale of loans	(11,851)	(4,971)	(10,738)
Loss on sale of other real estate	2,168	14,275	6,686
Gain on elimination of acquired debt	0	(1,988)	0
Net amortization of premiums and discounts	(85,066)	(48,374)	(112,759)
Amortization of intangible assets	22,894	6,955	2,309
FDIC receivable for loss share agreements	47,044	27,666	71,771
FDIC payable for loss share agreements	9,918	6,933	7,821
Net change in other assets	(12,904)	(72,680)	100,437
Net change in other liabilities	14,458	1,319	49,177
Net cash provided by operating activities	233,056	182,242	331,007
INVESTING ACTIVITIES
Net change in loans outstanding	(1,311,447)	(814,372)	323,436
Purchases of investment securities available for sale	(2,467,993)	(2,518,680)	(2,671,420)
Proceeds from maturities of investment securities held to maturity	263	389	435
Proceeds from maturities of investment securities available for sale	1,478,608	2,482,722	2,437,851
Proceeds from sales of investment securities available for sale	1,286,120	422,652	0
Net change in overnight investments	(338,213)	221,730	(416,144)
Cash (paid to) received from the FDIC for loss share agreements	(33,296)	(1,286)	19,373
Proceeds from Sale of Other Real Estate	80,932	89,485	147,550
Proceeds from Sale of Loans Held-for-investment	45,862	0	0
Additions to premises and equipment	(89,734)	(82,708)	(66,037)
Business acquisition, net of cash acquired	123,137	182,370	0
Net Cash Used in Divestiture of Businesses	(22,242)	0	0
Net cash (used) provided by investing activities	(1,248,003)	(17,698)	(224,956)
FINANCING ACTIVITIES
Net change in time deposits	(590,773)	(499,869)	(699,005)
Net change in demand and other interest-bearing deposits	1,607,487	497,692	487,046
Net change in short-term borrowings	(397,952)	(25,321)	(57,087)
Repayment of long-term obligations	(5,896)	(54,301)	(4,152)
Origination of long-term obligations	350,000	0	70,000
Stock issuance costs	0	(619)	0
Repurchase of common stock	0	0	(321)
Cash dividends paid	(18,015)	(11,543)	(8,663)
Net cash provided (used) by financing activities	944,851	(93,961)	(212,182)
Change in cash and due from banks	(70,096)	70,583	(106,131)
Cash and due from banks at beginning of period	604,182	533,599	639,730
Cash and due from banks at end of period	534,086	604,182	533,599
CASH PAYMENTS FOR:
Interest	46,785	48,894	59,234
Income taxes	136,900	127,970	102,890
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	55,032	65,956	92,125
Dividends declared but not paid	0	3,603	2,885
Reclassification of reserve for unfunded commitments to allowance for loans and leases	0	0	7,368	[1]
Repurchase and retirement of common stock	0	(46,085)	0
Issuance of common stock associated with Bancorporation merger	$ 0	$ 564,248	$ 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 o

Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2015
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. On January 1, 2014, FCB completed its merger with 1st Financial Services Corporation (1st Financial) of Hendersonville, NC and its wholly-owned subsidiary, Mountain 1st Bank & Trust Company (Mountain 1st). 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. On January 1, 2015, First Citizens Bank and Trust Company, Inc. (FCB-SC) merged with and into FCB. As of December 31, 2015, FCB remained the single banking subsidiary of BancShares. On February 13, 2015, FCB entered into an agreement with the Federal Deposit Insurance Corporation (FDIC), as Receiver, to purchase certain assets and assume certain liabilities of Capitol City Bank & Trust (CCBT). The CCBT 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 CCBT 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 operates 559 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma, Kansas and the District of Columbia. FCB provides 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. (FCIS) and First Citizens Securities Corporation (FCSC), and title insurance is offered through Neuse Financial Services, Inc. FCSC merged into FCIS effective January 1, 2016. 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 has 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 is not the primary beneficiary and does 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 or BancShares. The recorded investment in these entities is reported within other assets in BancShares' Consolidated Balance Sheets. Reclassifications In certain instances, 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. 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 initial maturities of three months or less. The carrying value of cash and cash equivalents approximates its fair value due to its short-term nature. 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, 2015 and 2014 , 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) 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 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. 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. Nonmarketable securities are recorded within other assets in BancShares’ Consolidated Balance Sheets. FHLB and nonmarketable securities were $37.7 million and $52.8 million at December 31, 2015 and 2014 , respectively. Loans Held For Sale BancShares has elected to apply the fair value option for new originations of prime residential mortgage loans to be sold. 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, were $16.6 million and $20.8 million at December 31, 2015 and 2014 , respectively. Non-PCI loans include originated commercial, originated noncommercial, purchased non-impaired loans, purchased leases 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 Accounting Standards Codification (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 allowance through provision expense, and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life. For non-pooled PCI loans and leases, accretion income is recognized 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 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 be 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 if the loss is deemed confirmed. 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 (NRV). Net realizable value equals fair value less estimated selling costs. Any excess of recorded investment in the loan over NRV at the time of foreclosure is booked against the allowance for loan and lease losses as a charge-off. Any excess in NRV over recorded investment in the loan at the time of foreclosure is recorded as a recovery of prior charge-off, if any, up to the amount of prior charge-off with excess recorded as an offset to foreclosure-related expense. 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 foreclosure-related expense. Gains and losses resulting from the sale or write down of OREO and income and expenses related to its operation are recorded in foreclosure-related 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 NRV. 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 payments that may be owed to the FDIC at the termination of the loss share agreements . The 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 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 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 related 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. It also includes establishing an ALLL for PCI loans that have deteriorated since acquisition. 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 purchased 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 by the factors in the qualitative framework to address environmental factors not reflected in the historical experience. These adjustments are specific to the loan class level. In accordance with our allowance methodology, reserve factors related to the qualitative component of the ALLL were updated in 2015 resulting in a release of approximately $4.8 million of reserves. The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans, BancShares continues to estimate cash flows expected to be collected on individual loans or pools of loans 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 recorded investment in the loan 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

Business Combinations Business

Business Combinations Business Combinations (Notes)	12 Months Ended
	Dec. 31, 2015
Business Acquisition [Line Items]
Business Combinations	BUSINESS COMBINATIONS Capitol City Bank & Trust Company On February 13, 2015, FCB entered into an agreement with the FDIC, as Receiver, to purchase certain assets and assume certain liabilities of CCBT. The acquisition expanded FCB's presence in Georgia as CCBT operated eight branch locations in Atlanta, Stone Mountain, Albany, Augusta and Savannah, Georgia. In June of 2015, FCB closed one of the branches in Atlanta. The CCBT transaction was accounted for under the acquisition method of accounting and, accordingly, assets acquired and liabilities assumed were recorded at their estimated fair values on the acquisition date. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information regarding closing date fair values becomes available. The fair value of the assets acquired was $211.9 million , including $154.5 million in loans and $690 thousand of identifiable intangible assets. Liabilities assumed were $272.5 million of which $266.4 million were deposits. During the second quarter of 2015, adjustments were made to the acquisition fair values primarily based upon updated collateral valuations resulting in an increase of $5.4 million to the gain on acquisition. These adjustments were applied retroactively to the first quarter of 2015 and brought the total gain on the transaction to $42.9 million which is included in noninterest income in the Consolidated Statement of Income. The total after-tax impact of the gain was $26.4 million . The following table provides the identifiable assets acquired and liabilities assumed at their estimated fair values as of the acquisition date. (Dollars in thousands) As recorded by FCB Assets Cash and cash equivalents $ 19,622 Investment securities 35,413 Loans 154,496 Intangible assets 690 Other assets 1,714 Total assets acquired 211,935 Liabilities Deposits 266,352 Short-term borrowings 5,501 Other liabilities 667 Total liabilities assumed 272,520 Fair value of net liabilities assumed (60,585 ) Cash received from FDIC 103,515 Gain on acquisition of CCBT $ 42,930 Merger-related expenses of $1.9 million were recorded in the Consolidated Statement of Income for the year ended December 31, 2015 . Loan-related interest income generated from CCBT was approximately $8.3 million for the year ended December 31, 2015 . All loans resulting from the CCBT transaction were recorded at the 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. 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 $29.1 million was recognized on these shares as a result and is included in securities gains on the Consolidated Statement of Income for 2014. 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 created a more diversified financial institution that is better equipped to respond to economic and industry developments. Additionally, cost savings, efficiencies and other benefits were 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 were subject to refinement for up to one year after the closing date of the transaction. The measurement period ended on October 1, 2015. 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. There were no adjustments to goodwill based on the allowed one year measurement period. 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 $12.3 million and $8.0 million were recorded in the Consolidated Statements of Income for the years ended December 31, 2015 and 2014 , respectively. As of December 31, 2015 , all merger related activities are complete and no further merger-related expenses are anticipated. 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 at the acquisition date, 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 future results of operations of BancShares. Year ended December 31 (Dollars in thousands, unaudited) 2014 Total revenue (interest income plus noninterest income) $ 1,336,340 Net loss $ (13,171 ) 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). 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 Troubled Asset Relief Program obligation and $2.0 million paid to the shareholders of 1st Financial. The 1st Financial merger was accounted for under the acquisition method of accounting and, accordingly, assets acquired and liabilities assumed were recorded at their estimated fair values on the acquisition date. These fair values were subject to refinement for up to one year after the closing date of the acquisition. The measurement period ended on December 31, 2014. Assets acquired, excluding goodwill, were $612.9 million , including $307.9 million in loans and leases, $237.4 million of investment securities available for sale, $28.2 million in cash and $3.8 million in core deposit intangibles. Liabilities assumed were $635.8 million , including $631.9 million of deposits. Goodwill of $32.9 million was recorded equaling the excess purchase price over the estimated fair value of the net assets acquired on the acquisition date. 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, 2015
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, 2015 and 2014 , were as follows: December 31, 2015 (Dollars in thousands) Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities available for sale U.S. Treasury $ 1,675,996 $ 4 $ 1,118 $ 1,674,882 Government agency 498,804 230 374 498,660 Mortgage-backed securities 4,692,447 5,120 29,369 4,668,198 Equity securities 7,935 968 10 8,893 Other 10,615 45 — 10,660 Total investment securities available for sale $ 6,885,797 $ 6,367 $ 30,871 $ 6,861,293 December 31, 2014 Cost Gross unrealized gains Gross unrealized losses Fair value 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, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities held to maturity Mortgage-backed securities $ 255 $ 10 $ — $ 265 December 31, 2014 Cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities $ 518 $ 26 $ — $ 544 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, 2015 December 31, 2014 (Dollars in thousands) Cost Fair value Cost Fair value Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 1,255,714 $ 1,255,094 $ 447,866 $ 447,992 One through five years 919,086 918,448 3,087,521 3,090,621 Five through 10 years 8,500 8,500 — — Over 10 years 2,115 2,160 — — Mortgage-backed securities 4,692,447 4,668,198 3,628,187 3,633,304 Equity securities 7,935 8,893 — — Total investment securities available for sale $ 6,885,797 $ 6,861,293 $ 7,163,574 $ 7,171,917 Investment securities held to maturity Mortgage-backed securities held to maturity $ 255 $ 265 $ 518 $ 544 For each period presented, securities gains (losses) include the following: Year ended December 31 (Dollars in thousands) 2015 2014 2013 Gross gains on retirement/sales of investment securities available for sale $ 10,834 $ 29,129 $ — Gross losses on sales of investment securities available for sale (17 ) (33 ) — Total securities gains $ 10,817 $ 29,096 $ — The following table provides information regarding securities with unrealized losses as of December 31, 2015 and 2014 : December 31, 2015 Less than 12 months 12 months or more Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment securities available for sale: U.S. Treasury $ 1,539,637 $ 1,118 $ — $ — $ 1,539,637 $ 1,118 Government agency 229,436 374 — — 229,436 374 Mortgage-backed securities 3,570,470 23,275 280,126 6,094 3,850,596 29,369 Equity securities 728 10 — — 728 10 Other — — — — — — Total $ 5,340,271 $ 24,777 $ 280,126 $ 6,094 $ 5,620,397 $ 30,871 December 31, 2014 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized 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 Investment securities with an aggregate fair value of $280.1 million have had continuous unrealized losses for more than 12 months as of December 31, 2015 with an aggregate unrealized loss of $6.1 million . As of December 31, 2015 , all 39 of these investments are government sponsored enterprise-issued mortgage-backed securities. None of the unrealized losses identified as of December 31, 2015 or December 31, 2014 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 $4.73 billion at December 31, 2015 and $4.37 billion at December 31, 2014 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, 2015
Loans and Leases Receivable Disclosure [Abstract]
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-PCI loans include originated commercial, originated noncommercial, purchased revolving, and purchased non-impaired loans. For purchased non-impaired loans to be included as non-PCI, it must be determined that the loans do not have a discount due, at least in part, to credit quality at the time of acquisition. Conversely, 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 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 . PCI loans 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. Note A of BancShares' Notes to Consolidated Financial Statements provides additional information. BancShares reports 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, commercial 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 for business equipment, vehicles and other assets. 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 single-family 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 outstanding include the following as of the dates indicated: (Dollars in thousands) December 31, 2015 December 31, 2014 Non-PCI loans and leases: Commercial: Construction and land development $ 620,352 $ 493,133 Commercial mortgage 8,274,548 7,552,948 Other commercial real estate 321,021 244,875 Commercial and industrial 2,368,958 1,988,934 Lease financing 730,778 571,916 Other 314,832 353,833 Total commercial loans 12,630,489 11,205,639 Noncommercial: Residential mortgage 2,695,985 2,493,058 Revolving mortgage 2,523,106 2,561,800 Construction and land development 220,073 205,016 Consumer 1,219,821 1,117,454 Total noncommercial loans 6,658,985 6,377,328 Total non-PCI loans and leases 19,289,474 17,582,967 PCI loans: Commercial: Construction and land development $ 33,880 $ 78,079 Commercial mortgage 525,468 577,518 Other commercial real estate 17,076 40,193 Commercial and industrial 15,182 27,254 Other 2,008 3,079 Total commercial loans 593,614 726,123 Noncommercial: Residential mortgage 302,158 382,340 Revolving mortgage 52,471 74,109 Construction and land development — 912 Consumer 2,273 3,014 Total noncommercial loans 356,902 460,375 Total PCI loans 950,516 1,186,498 Total loans and leases $ 20,239,990 $ 18,769,465 At December 31, 2015 , $272.6 million in total loans were covered under loss share agreements, compared to $485.3 million at December 31, 2014 . During 2015, loss share protection expired for non-single family residential loans acquired from Sun American Bank (SAB) and Williamsburg First National Bank (WFNB) and all loans acquired from First Regional Bank (FRB). The loan balances at December 31, 2015 for the expired agreements from SAB and WFNB were $26.7 million and $6.8 million , respectively. FRB loan balances at December 31, 2015 were insignificant. Loss share protection for United Western Bank (UWB), Atlantic Bank & Trust (ABT) and Colorado Capital Bank (CCB) non-single family residential loans with balances of $119.6 million , $9.7 million and $4.8 million , respectively, at December 31, 2015 will expire at the beginning of the second quarter of 2016, third quarter of 2016 and fourth quarter of 2016, respectively. The remaining decrease in covered loans is due to pay downs and payoffs. At December 31, 2015 , $8.58 billion in noncovered loans with a lendable collateral value of $6.08 billion were used to secure $510.3 million in FHLB of Atlanta advances, resulting in additional borrowing capacity of $5.57 billion . 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 additional borrowing capacity of $1.96 billion . To mitigate interest rate risk and credit risk, we sold $45.9 million of certain residential mortgage loans at par during 2015. The unamortized discount related to non-PCI loans and leases acquired in the Bancorporation merger was $41.1 million and $61.2 million at December 31, 2015 and December 31, 2014 , respectively. During the years ended December 31, 2015 and December 31, 2014 , accretion income on non-PCI loans was $18.7 million and $5.9 million , respectively. 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 any 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 affected 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, 2015 and December 31, 2014 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. The composition of the loans and leases outstanding at December 31, 2015 , and December 31, 2014 , by credit quality indicator is provided below: Non-PCI commercial loans and leases (Dollars in thousands) Construction and land development Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Total non-PCI commercial loans and leases Grade: December 31, 2015 Pass $ 611,314 $ 8,024,831 $ 318,187 $ 2,219,606 $ 719,338 $ 311,401 $ 12,204,677 Special mention 5,191 100,220 475 19,361 4,869 1,905 132,021 Substandard 3,847 146,071 959 21,322 6,375 1,526 180,100 Doubtful — 599 — 408 169 — 1,176 Ungraded — 2,827 1,400 108,261 27 — 112,515 Total $ 620,352 $ 8,274,548 $ 321,021 $ 2,368,958 $ 730,778 $ 314,832 $ 12,630,489 December 31, 2014 Pass $ 474,374 $ 7,284,714 $ 242,053 $ 1,859,415 $ 564,319 $ 349,111 $ 10,773,986 Special mention 13,927 129,247 909 27,683 3,205 1,384 176,355 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 $ 493,133 $ 7,552,948 $ 244,875 $ 1,988,934 $ 571,916 $ 353,833 $ 11,205,639 Non-PCI noncommercial loans and leases (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer Total non-PCI noncommercial December 31, 2015 Current $ 2,651,209 $ 2,502,065 $ 214,555 $ 1,210,832 $ 6,578,661 30-59 days past due 23,960 11,706 3,211 5,545 44,422 60-89 days past due 7,536 3,704 669 1,822 13,731 90 days or greater past due 13,280 5,631 1,638 1,622 22,171 Total $ 2,695,985 $ 2,523,106 $ 220,073 $ 1,219,821 $ 6,658,985 December 31, 2014 Current $ 2,454,797 $ 2,542,807 $ 202,344 $ 1,110,153 $ 6,310,101 30-59 days past due 23,288 11,097 1,646 4,577 40,608 60-89 days past due 6,018 2,433 824 1,619 10,894 90 days or greater past due 8,955 5,463 202 1,105 15,725 Total $ 2,493,058 $ 2,561,800 $ 205,016 $ 1,117,454 $ 6,377,328 PCI commercial loans (Dollars in thousands) Construction and land development Commercial mortgage Other commercial real estate Commercial and industrial Other Total PCI commercial loans Grade: December 31, 2015 Pass $ 14,710 $ 262,579 $ 7,366 $ 9,302 $ 706 $ 294,663 Special mention 758 87,870 60 937 — 89,625 Substandard 14,131 163,801 9,229 4,588 1,302 193,051 Doubtful 4,281 10,875 — 282 — 15,438 Ungraded — 343 421 73 — 837 Total $ 33,880 $ 525,468 $ 17,076 $ 15,182 $ 2,008 $ 593,614 December 31, 2014 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 PCI noncommercial loans (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer Total PCI noncommercial December 31, 2015 Current $ 257,207 $ 47,901 $ — $ 1,981 $ 307,089 30-59 days past due 12,318 1,127 — 86 13,531 60-89 days past due 4,441 501 — 132 5,074 90 days or greater past due 28,192 2,942 — 74 31,208 Total $ 302,158 $ 52,471 $ — $ 2,273 $ 356,902 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 The aging of the outstanding non-PCI loans and leases, by class, at December 31, 2015 , and December 31, 2014 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 as 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, 2015 (Dollars in thousands) 30-59 days past due 60-89 days past due 90 days or greater Total past due Current Total loans and leases Non-PCI loans and leases: Construction and land development - commercial $ 987 $ 283 $ 463 $ 1,733 $ 618,619 $ 620,352 Commercial mortgage 13,023 3,446 14,495 30,964 8,243,584 8,274,548 Other commercial real estate 884 — 142 1,026 319,995 321,021 Commercial and industrial 2,133 1,079 1,780 4,992 2,363,966 2,368,958 Lease financing 2,070 2 164 2,236 728,542 730,778 Residential mortgage 23,960 7,536 13,280 44,776 2,651,209 2,695,985 Revolving mortgage 11,706 3,704 5,631 21,041 2,502,065 2,523,106 Construction and land development - noncommercial 3,211 669 1,638 5,518 214,555 220,073 Consumer 5,545 1,822 1,622 8,989 1,210,832 1,219,821 Other 3 164 134 301 314,531 314,832 Total non-PCI loans and leases $ 63,522 $ 18,705 $ 39,349 $ 121,576 $ 19,167,898 $ 19,289,474 December 31, 2014 30-59 days past due 60-89 days past due 90 days or greater Total past due Current Total loans and leases Non-PCI loans and leases: Construction and land development - commercial $ 520 $ 283 $ 330 $ 1,133 $ 492,000 $ 493,133 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 2,454,797 2,493,058 Revolving mortgage 11,097 2,433 5,463 18,993 2,542,807 2,561,800 Construction and land development - noncommercial 1,646 824 202 2,672 202,344 205,016 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 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, 2015 and December 31, 2014 for non-PCI loans, were as follows: December 31, 2015 December 31, 2014 (Dollars in thousands) Nonaccrual loans and leases Loans and leases > 90 days and accruing Nonaccrual loans and leases Loans and leases > 90 days and accruing Non-PCI loans and leases: Construction and land development - commercial $ 425 $ 273 $ 343 $ 56 Commercial mortgage 42,116 242 24,720 1,003 Commercial and industrial 6,235 953 1,741 239 Lease financing 389 — 374 2 Other commercial real estate 239 — 619 35 Construction and land development - noncommercial 2,164 — — 202 Residential mortgage 29,977 838 14,242 3,191 Revolving mortgage 12,704 — — 5,463 Consumer 1,472 1,007 — 1,059 Other 133 2 1,966 — Total non-PCI loans and leases $ 95,854 $ 3,315 $ 44,005 $ 11,250 Purchased credit-impaired (PCI) loans The following table relates to PCI loans acquired in the CCBT merger for 2015 and in the Bancorporation and 1st Financial mergers for 2014. The table summarizes the contractually required payments, which include principal and interest, expected cash flows to be collected, and the fair value of PCI loans at the respective merger dates. (Dollars in thousands) 2015 2014 Contractually required payments $ 247,812 $ 828,156 Cash flows expected to be collected $ 207,688 $ 735,381 Fair value of loans at acquisition $ 154,496 $ 623,408 The recorded fair values of PCI loans acquired in the CCBT, Bancorporation and 1st Financial transaction as of their respective merger dates were as follows: (Dollars in thousands) 2015 2014 Commercial: Construction and land development $ 4,116 $ 69,789 Commercial mortgage 129,732 176,841 Other commercial real estate 3,202 15,425 Commercial and industrial 2,844 37,583 Other — 2,219 Total commercial loans 139,894 301,857 Noncommercial: Residential mortgage 13,251 287,675 Revolving mortgage — 29,777 Construction and land development — 199 Consumer 1,351 3,900 Total noncommercial loans 14,602 321,551 Total PCI loans $ 154,496 $ 623,408 The following table provides changes in the carrying value of purchased credit-impaired loans during the years ended December 31, 2015 and 2014 : (Dollars in thousands) 2015 2014 Balance at January 1 $ 1,186,498 $ 1,029,426 Fair value of PCI loans acquired during the year 154,496 623,408 Accretion 114,580 112,368 Payments received and other changes, net (505,058 ) (578,704 ) Balance at December 31 $ 950,516 $ 1,186,498 Unpaid principal balance at December 31 $ 1,693,372 $ 2,057,691 The carrying value of loans on the cost recovery method was $5.3 million at December 31, 2015 , and $33.4 million at December 31, 2014 . 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. The recorded investment of PCI loans on nonaccrual status was $7.6 million and $33.4 million at December 31, 2015 and December 31, 2014 , respectively. 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 2015 and 2014 . (Dollars in thousands) 2015 2014 Balance at January 1 $ 418,160 $ 439,990 Additions from acquisitions 53,192 111,973 Accretion (114,580 ) (112,368 ) Reclassifications from nonaccretable difference 25,357 7,865 Changes in expected cash flows that do not affect nonaccretable difference (38,273 ) (29,300 ) Balance at December 31 $ 343,856 $ 418,160 Purchased non-impaired loans and leases The following table relates to purchased non-impaired loans and leases acquired in the Bancorporation merger for 2014 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) 2014 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 were as follows: (Dollars in thousands) 2014 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 $ 4,175,586

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2015
Loans and Leases Receivable, Allowance [Abstract]
Allowance for Loan and Lease Losses	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, 2015 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance recorded Non-PCI impaired loans and leases Construction and land development - commercial $ 1,623 $ 1,471 $ 3,094 $ 4,428 $ 123 Commercial mortgage 41,793 53,314 95,107 103,763 3,370 Other commercial real estate 305 122 427 863 289 Commercial and industrial 8,544 9,366 17,910 21,455 1,118 Lease financing 1,651 104 1,755 1,956 213 Other — 1,183 1,183 1,260 — Residential mortgage 10,097 12,889 22,986 25,043 1,212 Revolving mortgage 1,105 4,778 5,883 7,120 299 Construction and land development - noncommercial 693 91 784 784 49 Consumer 1,050 188 1,238 1,294 527 Total non-PCI impaired loans and leases $ 66,861 $ 83,506 $ 150,367 $ 167,966 $ 7,200 December 31, 2014 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance 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 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, 2015 , 2014 and 2013 : Year ended December 31, 2015 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 3,164 $ 146 Commercial mortgage 89,934 3,129 Other commercial real estate 481 12 Commercial and industrial 14,587 510 Lease financing 1,718 74 Other 1,673 37 Residential mortgage 18,524 557 Revolving mortgage 4,368 97 Construction and land development - noncommercial 829 38 Consumer 1,126 75 Total non-PCI impaired loans and leases $ 136,404 $ 4,675 Year ended December 31, 2014 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 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, 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 Provision (credit) for loan and lease losses 22,937 (2,273 ) 20,664 Loans and leases charged off (25,304 ) (3,044 ) (28,348 ) Loans and leases recovered 9,434 — 9,434 Net charge-offs (15,870 ) (3,044 ) (18,914 ) Balance at December 31, 2015 $ 189,904 $ 16,312 $ 206,216 (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 years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non- commercial Consumer Non- specific Total Non-PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 4,773 (15,822 ) 1,569 17,432 1,602 (1,420 ) 4,202 (927 ) 541 10,987 — 22,937 Charge-offs (1,012 ) (1,498 ) (178 ) (5,952 ) (402 ) — (1,619 ) (2,925 ) (22 ) (11,696 ) — (25,304 ) Recoveries 566 2,027 45 909 38 91 861 1,173 74 3,650 — 9,434 Balance at December 31, 2015 $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ — $ 189,904 (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 . December 31, 2015 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total Non-PCI Loans Allowance for loan and lease losses: ALLL for loans and leases individually evaluated for impairment $ 123 $ 3,370 $ 289 $ 1,118 $ 213 $ — $ 1,212 $ 299 $ 49 $ 527 $ 7,200 ALLL for loans and leases collectively evaluated for impairment 16,165 66,526 1,879 41,998 5,311 1,855 12,893 15,672 1,436 18,969 182,704 Total allowance for loan and lease losses $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ 189,904 Loans and leases: Loans and leases individually evaluated for impairment $ 3,094 $ 95,107 $ 427 $ 17,910 $ 1,755 $ 1,183 $ 22,986 $ 5,883 $ 784 $ 1,238 $ 150,367 Loans and leases collectively evaluated for impairment 617,258 8,179,441 320,594 2,351,048 729,023 313,649 2,672,999 2,517,223 219,289 1,218,583 19,139,107 Total loan and leases $ 620,352 $ 8,274,548 $ 321,021 $ 2,368,958 $ 730,778 $ 314,832 $ 2,695,985 $ 2,523,106 $ 220,073 $ 1,219,821 $ 19,289,474 December 31, 2014 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total 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 491,513 7,470,145 244,291 1,977,594 571,293 351,833 2,478,145 2,558,125 203,676 1,116,459 17,463,074 Total loan and leases $ 493,133 $ 7,552,948 $ 244,875 $ 1,988,634 $ 571,916 $ 353,833 $ 2,493,058 $ 2,561,800 $ 205,016 $ 1,117,454 $ 17,582,667 For the years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Residential mortgage Revolving mortgage Construction and land development - noncommercial Consumer and other Total PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 1,029 (1,426 ) 698 (470 ) 72 (2,720 ) (183 ) 727 (2,273 ) Charge-offs (97 ) (871 ) — (325 ) (494 ) (756 ) — (501 ) (3,044 ) Recoveries — — — — — — — — — Balance at December 31, 2015 $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 December 31, 2015 ALLL for loans and leases acquired with deteriorated credit quality $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 Loans and leases acquired with deteriorated credit quality 33,880 525,468 17,076 15,182 302,158 52,471 — 4,281 950,516 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 27,254 382,340 74,109 912 6,093 1,186,498 At December 31, 2015 and December 31, 2014 , $469.3 million and $285.6 million , respectively, in PCI loans experienced an adverse change in expected cash flows since the date of acquisition. The corresponding valuation reserve was $16.3 million and $21.6 million , respectively. 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, 2015 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance recorded Non-PCI impaired loans and leases Construction and land development - commercial $ 1,623 $ 1,471 $ 3,094 $ 4,428 $ 123 Commercial mortgage 41,793 53,314 95,107 103,763 3,370 Other commercial real estate 305 122 427 863 289 Commercial and industrial 8,544 9,366 17,910 21,455 1,118 Lease financing 1,651 104 1,755 1,956 213 Other — 1,183 1,183 1,260 — Residential mortgage 10,097 12,889 22,986 25,043 1,212 Revolving mortgage 1,105 4,778 5,883 7,120 299 Construction and land development - noncommercial 693 91 784 784 49 Consumer 1,050 188 1,238 1,294 527 Total non-PCI impaired loans and leases $ 66,861 $ 83,506 $ 150,367 $ 167,966 $ 7,200 December 31, 2014 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance 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 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, 2015 , 2014 and 2013 : Year ended December 31, 2015 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 3,164 $ 146 Commercial mortgage 89,934 3,129 Other commercial real estate 481 12 Commercial and industrial 14,587 510 Lease financing 1,718 74 Other 1,673 37 Residential mortgage 18,524 557 Revolving mortgage 4,368 97 Construction and land development - noncommercial 829 38 Consumer 1,126 75 Total non-PCI impaired loans and leases $ 136,404 $ 4,675 Year ended December 31, 2014 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 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 , 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, 2015 December 31, 2014 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans Construction and land development - commercial $ 3,624 $ 257 $ 3,881 $ 2,591 $ 446 $ 3,037 Commercial mortgage 65,812 18,728 84,540 92,184 8,937 101,121 Other commercial real estate 1,751 89 1,840 2,374 449 2,823 Commercial and industrial 8,833 3,341 12,174 9,864 664 10,528 Lease 1,191 169 1,360 258 365 623 Other 1,183 — 1,183 34 — 34 Total commercial loans 82,394 22,584 104,978 107,305 10,861 118,166 Noncommercial Residential 25,427 7,129 32,556 22,597 4,655 27,252 Revolving mortgage 3,600 1,705 5,305 3,675 — 3,675 Construction and land development - noncommercial 784 — 784 1,391 — 1,391 Consumer and other 1,091 129 1,220 995 — 995 Total noncommercial loans 30,902 8,963 39,865 28,658 4,655 33,313 Total loans $ 113,296 $ 31,547 $ 144,843 $ 135,963 $ 15,516 $ 151,479 Total troubled debt restructurings at December 31, 2015 , were $144.8 million , of which $30.6 million were PCI and $114.2 million were non-PCI. TDRs at December 31, 2014 , were $151.5 million , which consisted of $46.9 million PCI and $104.6 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 projecting 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 or analysis of cash flows. The following tables provide the types of TDRs made during the year ended December 31, 2015 , and 2014 , as well as a summary of loans that were modified as a TDR during the year ended December 31, 2015 , and 2014 that subsequently defaulted during the year ended December 31, 2015 , and 2014 . 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, 2015 Year ended December 31, 2014 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 3 $ 185 — $ — 6 $ 1,973 2 $ 364 Commercial and industrial 2 776 — — 3 250 — — Lease financing — — — — 2 118 — — Construction and land development - noncommercial 1 91 — — — — — — Other — — — — 1 34 — — Total interest only 6 1,052 — — 12 2,375 2 364 Loan term extension Construction and land development - commercial 1 18 1 18 2 187 — — Commercial mortgage 12 3,144 2 316 18 4,848 — — Commercial and industrial 5 1,380 — — 5 2,274 — — Lease financing 4 146 — — 6 198 — — Residential mortgage 1 110 — — 19 572 — — Revolving mortgage 1 8 — — — — — — Construction and land development - noncommercial — — — — 7 226 — — Consumer 3 52 — 6 99 1 — Total loan term extension 27 4,858 3 334 63 8,404 1 — Below market interest rate Construction and land development - commercial 21 992 3 122 11 372 — — Commercial mortgage 37 13,900 3 3,969 44 12,642 3 441 Commercial and industrial 15 2,301 2 1,619 13 751 — — Other commercial real estate 2 122 — — 1 337 — — Residential mortgage 116 5,695 14 607 41 2,444 1 45 Revolving mortgage 6 136 — — 5 217 — — Construction & land development - noncommercial 2 253 — — 12 389 — — Consumer 18 146 2 10 10 193 — — Other 1 1,183 — — — — — — Total below market interest rate 218 24,728 24 6,327 137 17,345 4 486 Discharged from bankruptcy Construction and land development - commercial 4 38 1 3 — — — — Commercial mortgage 4 1,897 2 644 2 949 1 — Commercial and industrial 3 146 — — — — — — Residential mortgage 29 1,454 4 242 12 1,067 2 268 Revolving mortgage 56 2,714 9 701 17 663 1 — Construction & land development - noncommercial — — — — 1 62 1 62 Consumer 25 296 7 75 4 4 — — Total discharged from bankruptcy 121 6,545 23 1,665 36 2,745 5 330 Total non-PCI restructurings 372 $ 37,183 50 $ 8,326 248 $ 30,869 12 $ 1,180 Year ended December 31, 2015 Year ended December 31, 2014 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 Commercial mortgage — $ — — $ — 2 $ — 2 $ — Total interest only — — — — 2 — 2 — Loan term extension Construction and land development - commercial — — — — 1 332 — — Residential mortgage 1 178 — — 2 317 5 53 Construction and land development - noncommercial — — — — 1 51 — — Total loan term extension 1 178 — — 4 700 5 53 Below market interest rate Construction and land development - commercial — — — — 2 116 — — Commercial mortgage — — — — 16 5,783 3 138 Residential mortgage 14 1,187 2 96 29 3,948 3 23 Total below market interest rate 14 1,187 2 96 47 9,847 6 161 Discharged from bankruptcy Residential mortgage 2 282 — — 26 1,659 2 — Revolving mortgage 1 105 — — — — — — Total discharged from bankruptcy 3 387 — — 26 1,659 2 — Total PCI restructurings 18 $ 1,752 2 $ 96 79 $ 12,206 15 $ 214

Premises and Equipment (Notes)

Premises and Equipment (Notes)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31, 2015 and 2014 are summarized as follows: (Dollars in thousands) 2015 2014 Land $ 279,932 $ 284,682 Premises and leasehold improvements 1,089,644 1,056,126 Furniture and equipment 441,378 444,774 Total 1,810,954 1,785,582 Less accumulated depreciation and amortization 675,125 660,501 Total premises and equipment $ 1,135,829 $ 1,125,081 There were no premises pledged to secure borrowings at December 31, 2015 and 2014 . 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, 2015 : (Dollars in thousands) Year ended December 31 2016 $ 18,543 2017 14,415 2018 11,017 2019 8,040 2020 5,589 Thereafter 43,407 Total minimum payments $ 101,011 Total rent expense for all operating leases amounted to $13.8 million in 2015 , $18.5 million in 2014 and $21.4 million in 2013 , net of rent income, which was $6.4 million , $2.7 million and $1.8 million during 2015 , 2014 and 2013 , respectively.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Other Real Estate Owned	OTHER REAL ESTATE OWNED (OREO) The following table explains changes in other real estate owned during 2015 and 2014 . (Dollars in thousands) Covered Noncovered Total Balance at January 1, 2014 $ 47,081 $ 36,898 $ 83,979 Additions 29,708 36,574 66,282 Additions acquired in the Bancorporation merger 1,336 34,008 35,344 Additions acquired in the 1st Financial merger — 11,591 11,591 Sales (38,753 ) (48,935 ) (87,688 ) Writedowns (10,853 ) (5,219 ) (16,072 ) Transfers (1) (5,537 ) 5,537 — Balance at December 31, 2014 22,982 70,454 93,436 Additions 7,357 47,866 55,223 Sales (19,629 ) (56,853 ) (76,482 ) Writedowns (1,478 ) (5,140 ) (6,618 ) Transfers (1) (2,415 ) 2,415 — Balance at December 31, 2015 $ 6,817 $ 58,742 $ 65,559 (1) Transfers include OREO balances associated with expired loss share agreements. At December 31, 2015 and December 31, 2014 , BancShares had $16.1 million and $29.0 million , respectively, of foreclosed residential real estate property in OREO. The recorded investment in consumer mortgage loans collateralized by residential real estate property in the process of foreclosure totaled $15.6 million and $24.8 million at December 31, 2015 and December 31, 2014 , respectively.

Receivable from FDIC for Loss S

Receivable from FDIC for Loss Share Agreements	12 Months Ended
	Dec. 31, 2015
FDIC Loss Share Receivable [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, 2015, 2014 and 2013: Year ended December 31 (Dollars in thousands) 2015 2014 2013 Balance at January 1 $ 28,701 $ 93,397 $ 270,192 Additional receivable from Bancorporation merger — 5,106 — Amortization (10,899 ) (43,422 ) (85,651 ) Net cash payments to (from) the FDIC 33,296 1,286 (19,373 ) Post-acquisition adjustments (47,044 ) (27,666 ) (71,771 ) Balance at December 31 $ 4,054 $ 28,701 $ 93,397 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 U for information related to BancShares' recorded payable to the FDIC for loss share agreements. 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 for Temecula Valley Bank, Venture Bank and Georgian Bank expired during 2014. At the beginning of the second quarter of 2015, the loss share agreements for First Regional Bank and non-single family residential loans acquired from Sun American Bank expired. The loss share agreement for non-single family residential loans for Williamsburg First National Bank expired at the beginning of the fourth quarter of 2015. During 2016, the loss share agreements for non-single family residential loans for United Western Bank, Atlantic Bank & Trust and Colorado Capital Bank will expire at the beginning of the second, third and fourth quarters, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposits	DEPOSITS Deposits at December 31 are summarized as follows: (Dollars in thousands) 2015 2014 Demand $ 9,274,470 $ 8,086,784 Checking with interest 4,445,353 4,091,333 Money market accounts 8,205,705 8,264,811 Savings 1,909,021 1,728,504 Time 3,096,206 3,507,145 Total deposits $ 26,930,755 $ 25,678,577 Time deposits with a denomination exceeding $250,000 were $578.1 million and $552.3 million at December 31, 2015 and 2014 , respectively. At December 31, 2015 , the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2016 $ 2,359,710 2017 453,560 2018 114,448 2019 111,857 2020 56,631 Thereafter — Total time deposits $ 3,096,206

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Short-term Borrowings	SHORT-TERM BORROWINGS Short-term borrowings at December 31 are as follows: (Dollars in thousands) 2015 2014 Master notes $ — $ 410,258 Repurchase agreements 592,182 294,426 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 $ 594,733 $ 987,184 At December 31, 2015 , BancShares had unused credit lines allowing contingent access to overnight borrowings of up to $740.0 million on an unsecured basis. Additionally, under borrowing arrangements with the Federal Home Loan Bank of Atlanta, BancShares has access to an additional $5.57 billion on a secured basis. The master notes product, or investments used by commercial customers as an investment option through a sweep account, was discontinued during 2015, resulting in a migration to repurchase agreements. Additionally, $80.0 million in FHLB borrowings and $199.9 million in subordinated debt matured in 2015.

Repurchase Agreements (Notes)

Repurchase Agreements (Notes)	12 Months Ended
	Dec. 31, 2015
Repurchase Agreements [Abstract]
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	NOTE K REPURCHASE AGREEMENTS We utilize securities sold under agreements to repurchase to facilitate the needs of our customers and secure long-term funding needs. Repurchase agreements are transactions whereby we offer to sell to a counterparty an undivided interest in an eligible security at an agreed upon purchase price, and which obligates BancShares to repurchase the security on an agreed upon date at an agreed upon repurchase price plus interest at an agreed upon rate. Securities sold under agreements to repurchase are recorded at the amount of cash received in connection with the transaction and are generally reflected as short-term borrowings on the Consolidated Balance Sheets. We monitor collateral levels on a continuous basis and maintain records of each transaction specifically describing the applicable security and the counterparty’s fractional interest in that security, and we segregate the security from our general assets in accordance with regulations governing custodial holdings of securities. The primary risk with our repurchase agreements is market risk associated with the investments securing the transactions, as we may be required to provide additional collateral based on fair value changes of the underlying investments. Securities pledged as collateral under repurchase agreements are maintained with our safekeeping agents. The carrying value of available for sale investment securities pledged as collateral under repurchase agreements was $722.0 million and $418.3 million at December 31, 2015 and December 31, 2014 , respectively. The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in short-term borrowings in the Consolidated Balance Sheets as of December 31, 2015 and December 31, 2014 is presented in the following tables. December 31, 2015 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements: U.S. Treasury $ 592,182 $ — $ — $ 25,724 $ 617,906 Government agency — — — 4,276 4,276 Total borrowings $ 592,182 $ — $ — $ 30,000 $ 622,182 Gross amount of recognized liabilities for repurchase agreements $ 622,182 December 31, 2014 Remaining Contractual Maturity of the Agreements Overnight and continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements: U.S. Treasury $ 162,925 $ — $ — $ 23,086 $ 186,011 Government agency — — — 6,914 6,914 Mortgage-backed securities 131,501 — — — 131,501 Total borrowings $ 294,426 $ — $ — $ 30,000 $ 324,426 Gross amount of recognized liabilities for repurchase agreements $ 324,426

Long-Term Obligations

Long-Term Obligations	12 Months Ended
	Dec. 31, 2015
Long-term Obligations [Abstract]
Long-term Obligations	LONG-TERM OBLIGATIONS Long-term obligations at December 31 include: (Dollars in thousands) 2015 2014 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 25,774 26,547 Junior subordinated debenture at 3-month LIBOR plus 2.85 percent maturing April 7, 2034 10,310 10,310 Subordinated notes payable 8.00 percent June 1, 2018 15,000 15,000 Obligations under capitalized leases extending to July 2026 9,226 3,150 Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through March 2024 510,252 160,268 Note payable to the Federal Home Loan Bank of Des Moines (1) with a rate of 4.74 percent and a maturity date of July 2017 10,000 10,000 Unamortized purchase accounting adjustments (2,907 ) (466 ) Other long-term debt 30,108 30,119 Total long-term obligations $ 704,155 $ 351,320 (1) The Federal Home Loan Bank (FHLB) of Seattle merged with and into the FHLB of Des Moines effective May 31, 2015. As a result, the note payable to the FHLB of Seattle at December 31, 2014 was owed to the FHLB of Des Moines at December 31, 2015. At December 31, 2015 , long-term obligations included $132.5 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, 2015 and thereafter, include: Year ended December 31 2016 $ 3,401 2017 13,440 2018 135,232 2019 246 2020 261 Thereafter 551,575 Total long-term obligations $ 704,155

Estimated Fair Values

Estimated Fair Values	12 Months Ended
	Dec. 31, 2015
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. Equity securities are classified as Level 1 if they are traded on a heavily active market and as Level 2 if the observable closing price is from a less than active market. 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. 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. 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 based on the expiration date of each loss share agreement 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, 2015 and December 31, 2014 . 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. Cash and due from banks is classified on the fair value hierarchy as level 1. Overnight investments, income earned not collected, short-term borrowings and accrued interest payable are considered level 2. Lastly, the receivable from the FDIC for loss share agreements is designated as level 3. December 31, 2015 December 31, 2014 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 534,086 $ 534,086 $ 604,182 $ 604,182 Overnight investments 2,063,132 2,063,132 1,724,919 1,724,919 Investment securities available for sale 6,861,293 6,861,293 7,171,917 7,171,917 Investment securities held to maturity 255 265 518 544 Loans held for sale 59,766 59,766 63,696 63,696 Net loans and leases 20,033,774 19,353,325 18,564,999 18,046,497 Receivable from the FDIC for loss share agreements (1) 4,054 4,054 28,701 18,218 Income earned not collected 70,036 70,036 57,254 57,254 Federal Home Loan Bank stock 37,511 37,511 39,113 39,113 Mortgage servicing rights 19,351 19,495 16,688 16,736 Deposits 26,930,755 26,164,472 25,678,577 25,164,683 Short-term borrowings 594,733 594,733 987,184 987,184 Long-term obligations 704,155 718,102 351,320 367,732 Payable to the FDIC for loss share agreements 126,453 131,894 116,535 122,168 Accrued interest payable 5,713 5,713 8,194 8,194 Interest rate swap 1,429 1,429 4,337 4,337 (1) At December 31, 2015, the carrying value of the FDIC receivable approximates the fair value due to the short-term nature of the majority of loss share agreements. At December 31, 2014, the fair value of the FDIC receivable is estimated based on discounted future cash flows using current discount rates and 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 and interest rate swaps accounted for as cash flow hedges are reported at their fair values on a recurring basis. For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of December 31, 2015 and December 31, 2014 . December 31, 2015 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 $ 1,674,882 $ — $ 1,674,882 $ — Government agency 498,660 — 498,660 — Mortgage-backed securities 4,668,198 — 4,668,198 — Equity securities 8,893 1,668 7,225 — Other 10,660 — 10,660 — Total investment securities available for sale $ 6,861,293 $ 1,668 $ 6,859,625 $ — Loans held for sale $ 59,766 $ — $ 59,766 $ — Liabilities measured at fair value Interest rate swaps accounted for as cash flow hedges $ 1,429 $ — $ 1,429 $ — December 31, 2014 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 $ 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 $ — There were no transfers between levels during the years ended December 31, 2015 and 2014 . Fair Value Option Beginning in the fourth quarter of 2014, BancShares elected the fair value option for residential real estate loans held for sale. This election reduces certain timing differences in the Consolidated Statements of Income and better aligns with the management of the portfolio from a business perspective. 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, 2015 and 2014 . December 31, 2015 (Dollars in thousands) Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 59,766 $ 58,890 $ 876 December 31, 2014 Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 63,696 $ 62,996 $ 700 No loans held for sale were 90 or more days past due or on nonaccrual status as of December 31, 2015 and 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 years ended December 31, 2015 and 2014 . Year ended December 31 (Dollars in thousands) 2015 2014 Gains (losses) from fair value changes on loans held for sale $ 176 $ 202 The changes in fair value in the table above are recorded as a component of mortgage income on the Consolidated Statements of Income. 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, 2015 and December 31, 2014 . December 31, 2015 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Impaired loans 64,197 — — 64,197 Other real estate not covered under loss share agreements remeasured during current year 44,571 — — 44,571 Other real estate covered under loss share agreements remeasured during current year 4,403 — — 4,403 Mortgage servicing rights 17,997 — — 17,997 December 31, 2014 Fair value measurements using: 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 No financial liabilities were carried at fair value on a nonrecurring basis as of December 31, 2015 and December 31, 2014 .

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
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, a 401(k) savings plan and an enhanced 401(k) savings plan. 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 Employees who were hired prior to April 1, 2007 and qualified under length of service and other requirements are covered by a noncontributory defined benefit pension plan (BancShares Plan). The BancShares plan was closed to new participants as of April 1, 2007. Retirement benefits are based on years of service and average earnings. Covered employees fully vested in the BancShares Plan after five years of service. BancShares makes contributions to the pension plan in amounts between the minimum required for funding and the maximum amount deductible for federal income tax purposes. A $30.0 million discretionary contribution was made to the BancShares Plan during 2015 . No contributions were made during 2014 and BancShares does not anticipate making any contributions during 2016. Certain legacy Bancorporation employees who qualified under length of service and other requirements are covered by a noncontributory defined benefit pension plan (Bancorporation Plan). The Bancorporation plan was closed to new participants as of September 1, 2007. Retirement benefits are based on years of service and highest average annual compensation for five consecutive years during the last ten years of employment. Covered employees fully vested in the Bancorporation Plan after five years of service. BancShares makes contributions to the Bancorporation Plan in amounts between the minimum required for funding and the maximum amount deductible for federal income tax purposes. No contributions were made to the Bancorporation Plan for 2015 and 2014 and none are anticipated for 2016. 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, 2015 and 2014 . (Dollars in thousands) 2015 2014 Change in benefit obligation Projected benefit obligation at January 1 $ 627,645 $ 530,678 Service cost 14,083 12,332 Interest cost 26,975 25,615 Actuarial (gain) loss (39,002 ) 76,122 Benefits paid (18,199 ) (17,102 ) Projected benefit obligation at December 31 611,502 627,645 Change in plan assets Fair value of plan assets at January 1 544,956 524,017 Actual return on plan assets (6,732 ) 38,041 Employer contributions 30,000 — Benefits paid (18,199 ) (17,102 ) Fair value of plan assets at December 31 550,025 544,956 Funded status at December 31 $ (61,477 ) $ (82,689 ) The amounts recognized in the consolidated balance sheets at December 31, 2015 and 2014 consist of: (Dollars in thousands) 2015 2014 Other assets $ — $ — Other liabilities (61,477 ) (82,689 ) Net asset (liability) recognized $ (61,477 ) $ (82,689 ) The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2015 and 2014 . (Dollars in thousands) 2015 2014 Net loss $ 70,358 $ 80,806 Less prior service cost 556 767 Accumulated other comprehensive loss, excluding income taxes $ 70,914 $ 81,573 The following table provides expected amortization amounts for 2016 . (Dollars in thousands) Actuarial loss $ 6,398 Prior service cost 210 Total $ 6,608 The accumulated benefit obligation for the plan at December 31, 2015 and 2014 was $533.1 million and $537.0 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, 2015 and 2014 . The fair value of plan assets exceeded the accumulated benefit obligation as of December 31, 2015 and 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 years ended December 31, 2015, 2014 and 2013 . Year ended December 31 (Dollars in thousands) 2015 2014 2013 Service cost $ 14,083 $ 12,332 $ 16,332 Interest cost 26,975 25,615 23,686 Expected return on assets (33,198 ) (31,269 ) (27,733 ) Amortization of prior service cost 210 210 210 Amortization of net actuarial loss 11,376 5,148 16,985 Total net periodic benefit cost 19,446 12,036 29,480 Current year actuarial loss (gain) 927 69,349 (123,557 ) Amortization of actuarial loss (11,376 ) (5,148 ) (16,985 ) Amortization of prior service cost (210 ) (210 ) (210 ) Total recognized in other comprehensive income (10,659 ) 63,991 (140,752 ) Total recognized in net periodic benefit cost and other comprehensive income $ 8,787 $ 76,027 $ (111,272 ) The assumptions used to determine the benefit obligations at December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.68 % 4.27 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2015, 2014 and 2013 , are as follows: (Dollars in thousands) 2015 2014 2013 Discount rate 4.27 % 4.90 % 4.00 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 7.50 7.25 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 BancShares Plan assets represents the average rate of return expected to be earned on BancShares Plan assets over the period the benefits included in the benefit obligation are to be paid. In developing the expected rate of return, historical and current returns, as well as investment allocation strategies, on BancShares Plan assets are considered. Bancorporation Plan The following table provides the changes in benefit obligation and plan assets and the funded status of the plan at December 31, 2015 and 2014 . (Dollars in thousands) 2015 2014 Change in benefit obligation Projected benefit obligation at January 1 $ 151,332 $ — Projected benefit obligation at October 1 acquisition date — 137,452 Service cost 3,341 832 Interest cost 6,393 1,488 Actuarial (gain) loss (10,937 ) 12,802 Benefits paid (4,812 ) (1,242 ) Curtailments (2,076 ) — Projected benefit obligation at December 31 143,241 151,332 Change in plan assets Fair value of plan assets at January 1 155,618 — Fair value of plan assets at October 1 acquisition date — 150,374 Actual return on plan assets 87 6,486 Benefits paid (4,812 ) (1,242 ) Fair value of plan assets at December 31 150,893 155,618 Funded status at December 31 $ 7,652 $ 4,286 During 2015, there were plan curtailments of $2.1 million related to a decrease in the number of employees covered by the Bancorporation plan. The amounts recognized in the consolidated balance sheets at December 31, 2015 and 2014 consist of: (Dollars in thousands) 2015 2014 Other assets $ — $ — Other liabilities 7,652 4,286 Net asset (liability) recognized $ 7,652 $ 4,286 The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2015 and 2014 . (Dollars in thousands) 2015 2014 Net loss $ 7,505 $ 9,123 Less prior service cost — — Accumulated other comprehensive loss, excluding income taxes $ 7,505 $ 9,123 There are no expected amortization amounts for 2016. The accumulated benefit obligation for the plan at December 31, 2015 and 2014 was $131.9 million and $136.4 million , respectively. 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, 2015 and 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 years ended December 31, 2015 and 2014 . For 2014, the table only includes amounts after the October 1 acquisition of Bancorporation. Year ended December 31 (Dollars in thousands) 2015 2014 Service cost $ 3,341 $ 832 Interest cost 6,393 1,488 Expected return on assets (11,482 ) (2,807 ) Total net periodic benefit cost (1,748 ) (487 ) Current year actuarial loss 458 9,123 Curtailments (2,076 ) — Total recognized in other comprehensive income (1,618 ) 9,123 Total recognized in net periodic benefit cost and other comprehensive income $ (3,366 ) $ 8,636 The assumptions used to determine the benefit obligations at December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.68 % 4.27 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.27 % 4.35 % Rate of compensation increase 4.00 4.00 Expected long-term return on plan assets 7.50 7.50 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, historical and current returns, as well as investment allocation strategies, on Bancorporation Plan assets are considered. Plan Assets BancShares Plan Our 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 across global, economic and market risk factors in an attempt to reduce volatility and target multiple return sources. 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, 2015 and 2014 , by asset class are as follows: December 31, 2015 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 26,613 $ 26,613 $ — $ — 0 - 1% 5 % Equity securities 55 - 65% 63 % Common and preferred stock 267,037 267,037 — — Mutual funds 78,645 78,645 — — Fixed income 25 - 40% 26 % U.S. government and government agency securities 58,526 48,957 9,569 — Corporate bonds 70,809 — 70,809 — Mutual funds 17,351 17,351 — — Alternative investments 0 - 10% 6 % Mutual funds 31,044 31,044 — — Total pension assets $ 550,025 $ 469,647 $ 80,378 $ — 100 % December 31, 2014 Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 3,854 $ 3,854 — — 0 - 1% 1 % Equity securities 55 - 65% 62 % Common and preferred stock 284,656 284,656 — — Mutual funds 52,379 52,379 — — Fixed income 25 - 40% 28 % Mutual funds 153,928 — 153,928 — Alternative investments 0 - 10% 9 % Mutual funds 50,139 50,139 — — Total pension assets $ 544,956 $ 391,028 $ 153,928 $ — 100 % Cash and equivalents comprise approximately 5 percent of BancShares actual plan assets at December 31, 2015 , exceeding the target allocation range due to the $30.0 million contribution to the plan in December 2015. Bancorporation Plan Our 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 Bancorporation 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 across global, economic and market risk factors in an attempt to reduce volatility and target multiple return sources. 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. December 31, 2015 (Dollars in thousands) Market Value Quoted prices in Significant Significant Actual % Cash and equivalents $ 13,437 $ 13,437 — — 9 % Equity securities 63 % Common and preferred stock 80,676 80,676 — — Mutual funds 15,005 15,005 — — Fixed income 22 % U.S. government and government agency securities 20,476 3,986 16,490 — Corporate bonds 8,011 — 8,011 — Mutual funds 4,198 4,198 — — Alternative investments 6 % Mutual funds 9,090 9,090 — — Total pension assets $ 150,893 $ 126,392 $ 24,501 — December 31, 2014 Market Value Quoted prices in Significant Significant Actual % Cash and equivalents $ 13,077 $ 13,077 — — 8 % Equity securities 69 % Common and preferred stock 101,540 101,540 — — Mutual funds 5,793 5,793 — — Fixed income 23 % U.S. government and government agency securities 23,528 23,528 — — Corporate bonds 11,680 — 11,680 — 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 percent of Bancorporation Plan assets and whereby equity securities should not exceed 60 percent of Bancorporation Plan assets. Because the investment policy grants a 10 percent market value variance within the Bancorporation Plan when assessing overall asset allocation percentage, equity securities can comprise up to 70 percent of Bancorporation Plan assets before action is required. Alternative investments may also comprise up to 5 percent of the Bancorporation Plan assets. Cash Flows Following are estimated payments to pension plan participants in the indicated periods for each plan: (Dollars in thousands) BancShares Plan Bancorporation Plan 2016 $ 21,607 $ 5,463 2017 23,268 5,969 2018 24,895 6,420 2019 26,450 6,791 2020 28,207 7,209 2021-2025 166,567 43,671 401(k) Savings Plans Effective January 1, 2015, BancShares merged the legacy Bancorporation 401(k) savings plan and enhanced 401(k) savings plan into the existing BancShares 401(k) savings plan and enhanced 401(k) savings plan. 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 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. BancShares made participating contributions to the BancShares 401(k) plans of $22.6 million , $16.4 million and $14.9 million during 2015 , 2014 and 2013 , respectively. Legacy 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. This plan was merged into the existing BancShares 401(k) savings plan as of January 1, 2015 and ceased to exist. Legacy Bancorporation also had 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. This plan was merged into the existing BancShares enhanced 401(k) savings plan as of January 1, 2015 and ceased to exist. BancShares made participating contributions to the legacy Bancorporation plans of $1.1 million for 2014. Additional Benefits for Executives and Directors and Officers of Acquired Entities FCB has entered into contractual agreements with certain executives that provide payments for a period of no more than fifteen 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, 2015 and 2014 , and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2015 2014 Present value of accrued liability as of January 1 $ 43,211 $ 23,960 Benefits acquired in the 1st Financial merger — 1,455 Benefits acquired in the Bancorporation merger — 17,333 Benefit expense and interest cost 1,386 2,682 Benefits paid (4,485 ) (2,219 ) Benefits forfeited (234 ) — Present value of accrued liability as of December 31 $ 39,878 $ 43,211 Discount rate at December 31 4.68 % 4.27 %

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	12 Months Ended
	Dec. 31, 2015
Noninterest Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	OTHER NONINTEREST INCOME AND OTHER NONINTEREST EXPENSE Other noninterest income for the years ended December 31, 2015, 2014 and 2013 was $36.4 million , $29.3 million and $49.7 million , respectively. The most significant item in other noninterest income was recoveries on PCI loans that have been previously charged-off. BancShares records the portion of recoveries not covered under loss share agreements as noninterest income rather than as an adjustment to the allowance for loan losses since charge-offs on PCI loans are recorded against the discount recognized on the date of acquisition versus the allowance for loan losses. These recoveries were $21.2 million , $16.2 million and $29.7 million for the years ended December 31, 2015, 2014 and 2013 , respectively. Other noninterest expense for the years ended December 31, 2015, 2014 and 2013 included the following: (Dollars in thousands) 2015 2014 2013 Cardholder processing $ 21,735 $ 15,133 $ 13,780 Merchant processing 58,231 42,661 35,279 Collection 9,649 11,595 21,209 Processing fees paid to third parties 18,779 17,089 15,095 Cardholder reward programs 11,069 8,252 6,266 Telecommunications 14,406 10,834 10,033 Consultant 8,925 10,168 9,740 Core deposit intangible amortization 18,892 6,955 2,308 Advertising 12,431 11,461 8,286 Other 95,741 76,481 71,018 Total other noninterest expense $ 269,858 $ 210,629 $ 193,014

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES At December 31 , income tax expense consisted of the following: (Dollars in thousands) 2015 2014 2013 Current tax expense Federal $ 105,367 $ 84,430 $ 46,848 State 16,111 13,941 7,080 Total current tax expense 121,478 98,371 53,928 Deferred tax (benefit) expense Federal (2,758 ) (30,658 ) 38,731 State 3,308 (2,681 ) 8,915 Total deferred tax (benefit) expense 550 (33,339 ) 47,646 Total income tax expense $ 122,028 $ 65,032 $ 101,574 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) 2015 2014 2013 Income taxes at statutory rates $ 116,345 $ 71,258 $ 93,956 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (3,020 ) (1,832 ) (1,185 ) State and local income taxes, including change in valuation allowance, net of federal income tax benefit 12,622 7,319 10,397 Acquisition stock settlement — (10,185 ) — Tax credits net of amortization (3,060 ) (2,896 ) (960 ) Other, net (859 ) 1,368 (634 ) Total income tax expense $ 122,028 $ 65,032 $ 101,574 The net deferred tax asset included the following components at December 31 : (Dollars in thousands) 2015 2014 Allowance for loan and lease losses $ 78,878 $ 79,537 Pension liability 7,206 17,147 Executive separation from service agreements 9,856 13,753 State operating loss carryforward 21 29 Unrealized loss on cash flow hedge 537 1,673 Net unrealized loss on securities included in accumulated other comprehensive loss 9,379 — Accelerated depreciation 13,195 3,495 FDIC assisted transactions timing differences 66,456 77,388 Other reserves 10,772 12,770 Other 29,279 26,788 Deferred tax asset 225,579 232,580 Lease financing activities 15,492 12,706 Net unrealized gain on securities included in accumulated other comprehensive loss — 3,245 Net deferred loan fees and costs 6,051 4,532 Intangible assets 2,040 7,789 Security, loan and debt valuations 31,486 40,910 Other 12,026 13,287 Deferred tax liability 67,095 82,469 Net deferred tax asset $ 158,484 $ 150,111 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 in 2014 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 at December 31, 2015 or 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, 2015 and 2014 , and changes in the liability were not significant during 2015, 2014 and 2013 . BancShares does not expect the liability for unrecognized tax benefits to change significantly during 2016 . BancShares recognizes interest and penalties, if any, related to income tax matters in income tax expense, and the amounts recognized during 2015, 2014 and 2013 were not material. During the third quarter of 2015, BancShares adjusted its net deferred tax asset as a result of reductions in the North Carolina corporate income tax rate that will become effective January 1, 2016. The lower corporate income tax rate resulted in a reduction in the deferred tax asset and an increase in income tax expense in 2015. BancShares, its subsidiaries', and Bancorporation's federal income tax returns for 2012 through 2014 remain open for examination. 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. BancShares state tax returns are currently under examination in California for 2011 and 2012 and in Florida for 2011 through 2013.

Transactions with Related Perso

Transactions with Related Persons	12 Months Ended
	Dec. 31, 2015
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. On September 4, 2015, FCB signed a definitive agreement to sell certain assets and liabilities of its branch office located at 800 South Lafayette in Shelby, North Carolina to The Fidelity Bank, a financial institution controlled by Related Persons. The sale was completed on December 4, 2015. FCB sold $8.7 million of loans and $31.2 million of deposits while also receiving a premium on the deposits sold of $301 thousand . The transaction resulted in a net cash payment of $22.2 million by FCB to The Fidelity Bank. After transaction costs, the sale resulted in a net gain of $216 thousand for the year ended December 31, 2015. The sale on December 4, 2015 did not include the building located in Shelby, North Carolina. The sale of the building to The Fidelity Bank is expected to occur in 2016. For those identified as Related Persons as of December 31, 2015 , the following table provides an analysis of changes in the loans outstanding during 2015 and 2014 : Year ended December 31 (dollars in thousands) 2015 2014 Balance at January 1 $ 1,045 1,825 New loans 5 39 Repayments (971 ) (819 ) Balance at December 31 $ 79 1,045 Unfunded loan commitments available to Related Persons were $1.4 million and $1.3 million as of December 31, 2015 and 2014 , respectively. During 2015, 2014 and 2013 , fees from processing services included $98 thousand , $17.2 million and $21.6 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 were no longer any fees earned from Bancorporation. The amounts recorded from the largest individual institution were $66 thousand , $16.8 million and $20.4 million for 2015, 2014 and 2013 , respectively. BancShares has also provided certain contracted services for entities controlled by Related Persons which have been reimbursed and are not considered material. 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. Upon completion of the merger with Bancorporation on October 1, 2014 the issuer of the Trust Preferred Securities became a subsidiary of BancShares and BancShares' investment in the Trust Preferred Securities was eliminated in consolidation.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2015
Summary of Derivative Instruments [Abstract]
Derivatives	DERIVATIVES At December 31, 2015 , 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, 2015 and 2014 . December 31, 2015 December 31, 2014 (Dollars in thousands) Notional amount Estimated fair value of liability Notional amount Estimated fair value of liability 2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016 $ 93,500 $ 1,429 $ 93,500 $ 4,337 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, 2015 and 2014 , collateral with a fair value of $2.0 million and $7.0 million , respectively, 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, 2015, 2014 and 2013 , BancShares recognized interest expense of $3.3 million for each period, 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, 2015 that is expected to be reclassified into earnings within the next 12 months is a net after-tax loss of $1.1 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, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS Goodwill Goodwill was $139.8 million at December 31, 2015 and 2014 , with no impairment recorded during 2015, 2014 and 2013 . The following table presents the changes in the carrying amount of goodwill. (Dollars in thousands) 2015 2014 Balance at January 1 $ 139,773 $ 102,625 Acquired in the 1st Financial merger — 32,915 Acquired in the Bancorporation merger — 4,233 Balance at December 31 $ 139,773 $ 139,773 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 2015 and 2014 , no further analysis was required as there was no indication of impairment. Mortgage Servicing Rights Our portfolio of residential mortgage loans serviced for third parties was $2.15 billion and $1.95 billion as of December 31, 2015 and 2014 , respectively. These loans were originated by BancShares and sold to third parties on a non-recourse basis with servicing rights retained. These retained servicing rights are recorded as a servicing asset on the Consolidated Balance Sheets and are initially recorded at fair value. The activity of the servicing asset for the years ended December 31, 2015 and 2014 is presented in the following table: (Dollars in thousands) 2015 2014 Balance at January 1 $ 16,688 $ 16 Servicing rights originated 5,910 727 Amortization (4,002 ) (919 ) Servicing rights acquired in the 1st Financial merger — 148 Servicing rights acquired in the Bancorporation merger — 17,566 Valuation allowance reversal (provision) 755 (850 ) Balance at December 31 $ 19,351 $ 16,688 The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2015 and 2014 : (Dollars in thousands) 2015 2014 Balance at January 1 $ 850 $ — Valuation allowance (reversal) provision (755 ) 850 Balance at December 31 $ 95 $ 850 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. As of December 31, 2015 and 2014 , the carrying value BancShares' mortgage servicing rights was $19.4 million and $16.7 million , respectively. Contractually specified mortgage servicing fees, late fees, and ancillary fees earned for the years ended December 31, 2015, 2014 and 2013 were $5.4 million , $611 thousand , and $327 thousand respectively, and 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 $4.0 million , $919 thousand , and $205 thousand for the years ended December 31, 2015, 2014 and 2013 , respectively. Mortgage income included an impairment reversal of $755 thousand for the year ended December 31, 2015 and an impairment of $850 thousand for the year ended December 31, 2014 . There was no net valuation allowance impairment recorded for the year ended December 31, 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, 2015 and 2014 were as follows: 2015 2014 Discount rate - conventional fixed loans 9.31 % 7.20 % Discount rate - all loans excluding conventional fixed loans 10.31 % 9.20 % Weighted average constant prepayment rate 11.01 % 14.25 % Weighted average cost to service a loan $ 56.61 $ 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) 2015 2014 Balance at January 1 $ 89,922 $ 1,247 Acquired in CCBT merger 690 — Acquired in the 1st Financial merger — 3,780 Acquired in the Bancorporation merger — 91,850 Removal due to branch sale (85 ) — Amortization (18,892 ) (6,955 ) Balance at December 31 $ 71,635 $ 89,922 Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2015 and 2014 . During 2015, BancShares recognized $690 thousand in core deposit intangibles related to the CCBT merger. Core deposit intangibles of $85 thousand were written off in 2015 as it related to previously acquired deposits that were sold in connection with the sale of a branch in December 2015. During 2014, BancShares recognized $91.9 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 2 years to less than 9 years. The gross amount of other intangible assets and accumulated amortization as of December 31, 2015 and 2014 , are: (dollars in thousands) 2015 2014 Gross balance $ 115,201 $ 114,596 Accumulated amortization (43,566 ) (24,674 ) Carrying value $ 71,635 $ 89,922 Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be: (dollars in thousands) 2016 $ 16,440 2017 14,075 2018 11,710 2019 9,457 2020 7,492

Shareholders' Equity, Dividends

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Shareholders' Equity, Dividend Restrictions and Other Regulatory Matters	SHAREHOLDERS' EQUITY, DIVIDEND RESTRICTIONS AND OTHER REGULATORY MATTERS BancShares and FCB are required to meet minimum capital requirements set forth by regulatory authorities. Bank regulatory agencies approved regulatory capital guidelines (Basel III) aimed at strengthening existing capital requirements for banking organizations. Under Basel III, minimum requirements increase for both the quantity and quality of capital held by BancShares. Basel III included a new common equity Tier 1 ratio minimum of 4.50 percent , raised the minimum Tier 1 risk-based capital to 6.00 percent , requires a minimum total risk-based capital ratio of 8.00 percent and requires a minimum Tier 1 leverage capital ratio of 4.00 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. A new capital conservation buffer, comprised of common equity Tier 1 capital, was also established above the regulatory minimum requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625 percent of risk-weighted assets and increase each subsequent year by an additional 0.625 percent until reaching its final level of 2.50 percent on January 1, 2019. The phase-in period for Basel III became effective for BancShares on January 1, 2015, with full compliance of all Basel III requirements phased in over a multi-year schedule, to be fully phased in by January 1, 2019. Based on the most recent notifications from its regulators, FCB is well-capitalized under the regulatory framework for prompt corrective action. As of December 31, 2015 , BancShares and FCB met all capital adequacy requirements to which they are subject and were 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 and FCB as of December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Amount (1) Ratio (1) Requirements to be well-capitalized (2) Amount Ratio Requirements to be well-capitalized BancShares Tier 1 risk-based capital $ 2,831,242 12.65 % 8.00 % $ 2,690,324 13.61 % 6.00 % Common equity Tier 1 (3) 2,799,163 12.51 6.50 N/A N/A N/A Total risk-based capital 3,140,212 14.03 10.00 2,904,123 14.69 10.00 Leverage capital 2,831,242 8.96 5.00 2,690,324 8.91 5.00 FCB Tier 1 risk-based capital 2,821,475 12.64 8.00 2,019,595 13.12 6.00 Common equity Tier 1 (3) 2,821,475 12.64 6.50 N/A N/A N/A Total risk-based capital 3,038,070 13.61 10.00 2,212,163 14.37 10.00 Leverage capital 2,821,475 8.95 5.00 2,019,595 9.30 5.00 FCB-SC (4) Tier 1 risk-based capital N/A N/A N/A 653,515 15.11 6.00 Total risk-based capital N/A N/A N/A 657,475 15.20 10.00 Leverage capital N/A N/A N/A 653,515 7.89 5.00 (1) December 31, 2015 calculated under Basel III guidelines, which became effective January 1, 2015. (2) Regulatory well-capitalized requirements are based on 2015 Basel III regulatory capital guidelines. (3) Common equity Tier 1 ratio requirements were established under Basel III guidelines; therefore, this ratio is not applicable for periods prior to January 1, 2015. (4) FCB-SC merged into FCB effective January 1, 2015. As such, capital ratios are not applicable as of December 31, 2015. At December 31, 2015 , BancShares had $32.1 million of trust preferred capital securities included in Tier 1 capital, compared to $128.5 million at December 31, 2014 . Effective January 1, 2015 , 75 percent of BancShares' trust preferred capital securities were excluded from Tier 1 capital, with the remaining 25 percent to be phased out January 1, 2016 . The inclusion of accumulated other comprehensive income in Tier 1 common equity, as described in Basel III, 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. At December 31, 2015 and December 31, 2014 , Tier 2 capital of BancShares included $6.0 million and $9.0 million , respectively, of qualifying subordinated debt acquired in the Bancorporation merger with a scheduled maturity date of June 1, 2018. 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. 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 fourth quarter of 2015, our board approved a stock repurchase plan that provides for the purchase of up to 100,000 shares of Class A common stock beginning on November 1, 2015 and continuing through October 31, 2016. As of December 31, 2015 , no purchases had occurred pursuant to that authorization. The Board of Directors of FCB may approve distributions, including dividends, as it deems appropriate, subject to the requirements of the FDIC and the General Statutes of North Carolina, provided that the distributions do not reduce capital below applicable capital requirements. As of December 31, 2015 , the maximum amount of the dividend was limited to $902.6 million to preserve well-capitalized status. Dividends declared by FCB amounted to $75.0 million in 2015 , $30.0 million in 2014 and $131.0 million in 2013 . BancShares and FCB 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 2015 , the requirements averaged $531.6 million .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
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, 2015 , BancShares had unused commitments totaling $7.95 billion , compared to $7.19 billion at December 31, 2014 . Total unfunded commitments relating to investments in affordable housing projects were $41.8 million and $16.8 million at December 31, 2015 and December 31, 2014 , respectively, and are included in other liabilities on BancShares' Consolidated Balance Sheet. Affordable housing project investments were $85.6 million and $57.1 million at December 31, 2015 and December 31, 2014 , respectively, and are included in other assets on the Consolidated Balance Sheets. 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, and the fair value of those guarantees is not significant. To minimize its exposure, BancShares’ credit policies govern the issuance of standby letters of credit. At December 31, 2015 and 2014 , BancShares had standby letters of credit amounting to $77.9 million and $77.4 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 $3.0 million and $3.2 million as of December 31, 2015 and 2014 , respectively, for estimated losses arising from these standard representation and warranty provisions. BancShares has recorded a receivable from the FDIC totaling $4.1 million and $28.7 million as of December 31, 2015 and 2014 , 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 payments that may be owed to the FDIC at the termination of the agreements (clawback liability) . The clawback liability represents a 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, 2015 and 2014 , the clawback liability was $126.5 million and $116.5 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 Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Accumulated other comprehensive (loss) income included the following at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive income (loss) Deferred tax expense (benefit) Accumulated other comprehensive income (loss), net of tax Unrealized (losses) gains on investment securities available for sale $ (24,504 ) $ (9,379 ) $ (15,125 ) $ 8,343 $ 3,245 $ 5,098 Unrealized loss on cash flow hedge (1,429 ) (537 ) (892 ) (4,337 ) (1,673 ) (2,664 ) Funded status of defined benefit plan (78,419 ) (29,996 ) (48,423 ) (90,696 ) (35,281 ) (55,415 ) Total $ (104,352 ) $ (39,912 ) $ (64,440 ) $ (86,690 ) $ (33,709 ) $ (52,981 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2015 and 2014 : (Dollars in thousands) Unrealized gains (losses) on available-for-sale securities (1) Gains (losses) on cash flow hedges (1) Defined benefit pension items (1) Total Balance at January 1, 2014 $ (10,091 ) $ (4,434 ) $ (10,743 ) $ (25,268 ) Other comprehensive income (loss) before reclassifications 33,061 1,770 (47,946 ) (13,115 ) Amounts reclassified from accumulated other comprehensive (loss) income (17,872 ) — 3,274 (14,598 ) 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 ) Other comprehensive income (loss) before reclassifications (13,544 ) 1,772 394 (11,378 ) Amounts reclassified from accumulated other comprehensive (loss) income (6,679 ) — 6,598 (81 ) Net current period other comprehensive (loss) income (20,223 ) 1,772 6,992 (11,459 ) Balance at December 31, 2015 $ (15,125 ) $ (892 ) $ (48,423 ) $ (64,440 ) (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, 2015 and 2014 : (Dollars in thousands) Year ended December 31, 2015 Details about accumulated other comprehensive income (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 $ 10,817 Securities gains (4,138 ) Income taxes $ 6,679 Net income Amortization of defined benefit pension items Prior service costs $ (210 ) Employee benefits Actuarial losses (11,376 ) Employee benefits (11,586 ) Employee benefits 4,988 Income taxes $ (6,598 ) Net income Total reclassifications for the period $ 81 Year ended December 31, 2014 Details about accumulated other comprehensive income (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 ) Employee benefits 2,084 Income taxes $ (3,274 ) Net income Total reclassifications for the period $ 14,598 (1) Amounts in parentheses indicate debits to profit/loss.

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2015
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, 2015 December 31, 2014 Assets Cash $ 26,285 $ 24,026 Investment securities available for sale 21,137 110,644 Investment in banking subsidiaries 2,874,581 2,750,201 Investment in other subsidiaries 43,117 65,665 Due from subsidiaries — 295,994 Other assets 73,944 74,157 Total assets $ 3,039,064 $ 3,320,687 Liabilities and Shareholders' Equity Short-term borrowings $ — $ 485,207 Long-term obligations 133,775 136,717 Due to subsidiaries 29,682 — Other liabilities 3,498 11,169 Shareholders' equity 2,872,109 2,687,594 Total liabilities and shareholders' equity $ 3,039,064 $ 3,320,687 Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2015 2014 2013 Interest income $ 645 $ 1,784 $ 1,387 Interest expense 6,793 9,694 7,065 Net interest loss (6,148 ) (7,910 ) (5,678 ) Dividends from banking subsidiaries 75,006 82,419 131,006 Dividends from other subsidiaries 23,500 — — Other income 1,870 33,600 3,620 Other operating expense 2,634 6,534 2,344 Income before income tax benefit and equity in undistributed net income of subsidiaries 91,594 101,575 126,604 Income tax benefit (2,618 ) (2,590 ) (2,095 ) Income before equity in undistributed net income of subsidiaries 94,212 104,165 128,699 Equity in undistributed net income of subsidiaries 116,174 34,397 38,170 Net income $ 210,386 $ 138,562 $ 166,869 Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2015 2014 2013 OPERATING ACTIVITIES Net income $ 210,386 $ 138,562 $ 166,869 Adjustments Undistributed net income of subsidiaries (116,174 ) (34,397 ) (38,170 ) Net amortization of premiums and discounts (2,712 ) 594 334 Securities gains (236 ) (29,126 ) — Gain on elimination of acquired debt — (1,988 ) — Gain on sale of other assets — — (1,331 ) Change in other assets (3,070 ) 93,385 (61,704 ) Change in other liabilities (1,157 ) 2,250 (2,096 ) Net cash provided by operating activities 87,037 169,280 63,902 INVESTING ACTIVITIES Net change in due from subsidiaries 295,994 (150,328 ) (67,154 ) Purchases of investment securities (7,818 ) (33,243 ) (126,197 ) Proceeds from sales, calls, and maturities of securities 100,586 114,208 135,000 Investment in subsidiaries — 1,579 1,489 Business acquisitions, net of cash acquired — (24,772 ) — Net cash provided (used) by investing activities 388,762 (92,556 ) (56,862 ) FINANCING ACTIVITIES Net change in due to subsidiaries 29,682 — — Net change in short-term borrowings (485,207 ) (1,211 ) 12,860 Retirement of long-term obligations — (52,372 ) — Stock issuance costs — (619 ) — Repurchase of common stock — — (321 ) Cash dividends paid (18,015 ) (11,543 ) (8,663 ) Net cash (used) provided by financing activities (473,540 ) (65,745 ) 3,876 Net change in cash 2,259 10,979 10,916 Cash balance at beginning of year 24,026 13,047 2,131 Cash balance at end of year $ 26,285 $ 24,026 $ 13,047

Accounting Policies and Basis32

Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2015
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. On January 1, 2014, FCB completed its merger with 1st Financial Services Corporation (1st Financial) of Hendersonville, NC and its wholly-owned subsidiary, Mountain 1st Bank & Trust Company (Mountain 1st). 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. On January 1, 2015, First Citizens Bank and Trust Company, Inc. (FCB-SC) merged with and into FCB. As of December 31, 2015, FCB remained the single banking subsidiary of BancShares. On February 13, 2015, FCB entered into an agreement with the Federal Deposit Insurance Corporation (FDIC), as Receiver, to purchase certain assets and assume certain liabilities of Capitol City Bank & Trust (CCBT). The CCBT 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 CCBT 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 operates 559 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma, Kansas and the District of Columbia. FCB provides 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. (FCIS) and First Citizens Securities Corporation (FCSC), and title insurance is offered through Neuse Financial Services, Inc. FCSC merged into FCIS effective January 1, 2016.
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 has 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 is not the primary beneficiary and does 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 or BancShares. The recorded investment in these entities is reported within other assets in BancShares' Consolidated Balance Sheets.
Reclassifications	Reclassifications In certain instances, 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. 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 initial maturities of three months or less. The carrying value of cash and cash equivalents approximates its fair value due to its short-term nature.
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, 2015 and 2014 , 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) 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 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. 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. Nonmarketable securities are recorded within other assets in BancShares’ Consolidated Balance Sheets. FHLB and nonmarketable securities were $37.7 million and $52.8 million at December 31, 2015 and 2014 , respectively.
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. 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, were $16.6 million and $20.8 million at December 31, 2015 and 2014 , respectively. Non-PCI loans include originated commercial, originated noncommercial, purchased non-impaired loans, purchased leases 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 Accounting Standards Codification (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 allowance through provision expense, and then the amount of accretable yield recognized on a prospective basis over the loan's or pool's remaining life. For non-pooled PCI loans and leases, accretion income is recognized 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 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 be 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 if the loss is deemed confirmed. 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 (NRV). Net realizable value equals fair value less estimated selling costs. Any excess of recorded investment in the loan over NRV at the time of foreclosure is booked against the allowance for loan and lease losses as a charge-off. Any excess in NRV over recorded investment in the loan at the time of foreclosure is recorded as a recovery of prior charge-off, if any, up to the amount of prior charge-off with excess recorded as an offset to foreclosure-related expense. 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 foreclosure-related expense. Gains and losses resulting from the sale or write down of OREO and income and expenses related to its operation are recorded in foreclosure-related 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 NRV. 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 payments that may be owed to the FDIC at the termination of the loss share agreements . The 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 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 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 related 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. It also includes establishing an ALLL for PCI loans that have deteriorated since acquisition. 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 purchased 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 by the factors in the qualitative framework to address environmental factors not reflected in the historical experience. These adjustments are specific to the loan class level. In accordance with our allowance methodology, reserve factors related to the qualitative component of the ALLL were updated in 2015 resulting in a release of approximately $4.8 million of reserves. The ALLL for PCI loans is estimated based on the expected cash flows approach. Over the life of PCI loans, BancShares continues to estimate cash flows expected to be collected on individual loans or pools of loans 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 recorded investment in the loan 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, 2015 . 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 Non-PCI commercial loans or leases, excluding purchased non-impaired loans, purchased leases and certain purchased revolving credit, are 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 recorded investment in the loan 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 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 Non-PCI noncommercial loans, excluding purchased non-impaired loans and certain purchased revolving credit, are 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 recorded investment in the loan 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 recorded investment in the loan 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 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, BancShares continues to estimate cash flows expected to be collected on individual loans or pools of loans 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. The reserve for unfunded commitments was not significant at December 31, 2015 or 2014 .
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 7 to 40 years for premises and 3 to 10 years for furniture, software and equipment. Leasehold improvements are amortized over the terms of the respective leases, including renewal period if renewal period is reasonably assured (often through the presence of a bargain renewal option), 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 in noninterest expense and noninterest income, respectively, 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, 2015 , 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. As the stock market experienced volatility after the annual impairment test, management monitored the volatility and determined it did not indicate an impairment test triggering event. Additionally, there have been no other such events subsequent to the annual impairment test performed during 2015. Mortgage servicing rights (MSRs) are recognized separately when they are retained as loans are sold or acquired through acquisition. 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. 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.
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, 2015 and 2014 , BancShares had $592.2 million and $294.4 million of securities sold under repurchase agreements included as short-term borrowings on the Consolidated Balance Sheets, 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 M
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 accumulated 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 covering 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 N 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) 2015-10, Technical Corrections and Improvements The amendments in this ASU represent changes to clarify the Codification, correct unintended application of guidance and make minor improvements to the Codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. Additionally, some of the amendments will make the Codification easier to understand and easier to apply by eliminating inconsistencies, providing needed clarifications, and improving the presentation of guidance in the Codification. The transition guidance varies based on the amendments in this ASU. The amendments in this ASU that require transition guidance are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. All other amendments were effective upon issuance. We adopted the amendments effective second quarter of 2015. The adoption did not have an impact on our consolidated financial position or consolidated results of operations. FASB ASU 2015-08, Business Combinations (Topic 805): Pushdown Accounting - Amendments to Securities and Exchange Commission (SEC) Paragraphs Pursuant to Staff Accounting Bulletin No. 115 The amendments in this ASU remove references to SEC Staff Accounting Bulletin (SAB) Topic 5.J as the SEC staff previously rescinded its guidance with the issuance of SAB No. 115 when the FASB issued its own pushdown accounting guidance in ASU 2014-17, an amendment we adopted effective fourth quarter of 2014. We adopted the amendments in ASU 2015-08 effective second quarter of 2015. The adoption did not have an impact on our consolidated financial position or consolidated results of operations. 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: (1) the loan has a government guarantee that is not separable from the loan before foreclosure; (2) 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 (3) 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 were effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. We adopted this guidance effective first quarter of 2015. The initial adoption did not have an impact on our consolidated financial position or consolidated results of operations. 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 were effective for fiscal years beginning after December 15, 2014. In addition, the disclosures for certain transactions accounted for as a sale were effective for the fiscal period beginning after December 15, 2014, while the disclosures for transactions accounted for as secured borrowings were required to be presented for fiscal periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. We adopted the guidance effective first quarter of 2015. The initial adoption did not have any effect on our consolidated financial position or consolidated results of operations. The new disclosures required by this ASU are included in Note K . 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 were effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. We adopted the guidance effective first quarter of 2015. The initial adoption did not have any effect on our consolidated financial position or consolidated results of operations. The new disclosures required by this ASU are included in Note G . Recently Issued Accounting Pronouncements FASB ASU 2016-01, Financial Instruments—Overall (Subtopic 825-10) : Recognition and Measurement of Financial Assets and Financial Liabilities This ASU addresses certain aspects of recognition, measurement, presentation and disclosure. The amendments in this ASU (1) require equity investments to be measured at fair value with changes in fair value recognized in net income; (2) simplify the impairment assessment of equity investments without readily determinable fair value; (3) require public business entities to use exit prices, rather than entry prices, when measuring fair value of financial instruments for disclosure purposes; (4) require separate presentation of financial assets and financial liabilities by measurement category and form of financial assets on the balance sheet or the accompanying notes to the financial statements; (5) eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet; (6) require separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; and (7) state that a valuation allowance on deferred tax assets related to available-for-sale securities should be evaluated in combination with other deferred tax assets. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The ASU only permits early adoption of the instrument-specific credit risk provision. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2018. FASB ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments This ASU eliminates the requirement to retrospectively account for adjustments made to provisional amounts recognized in a business combination and requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts must be calculated as if the accounting had been completed at the acquisition date. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The amendments in this ASU should be applied prospectively to adjustments to provisional amounts that occur after the effective date of this ASU with earlier application permitted for financial statements that have not been issued. We will adopt the guidance effective in the first quarter of 2016 and do not anticipate any impact on our consolidated financial position or consolidated results of operations as a result of adoption. FASB ASU 2015-03, Interest–Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs This ASU simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. This ASU is effective for interim and annual periods beginning after December 15, 2015 for public business entities, and is to be applied retrospectively. Early adoption is permitted. We will adopt the guidance effective in the first quarter of 2016 and do not anticipate any impact on our consolidated financial position or consolidated results of operations as a result of adoption. FASB ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis This ASU improves targeted areas of consolidation guidance for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. In addition to reducing the number of consolidation models from four to two, the new standard places more emphasis on risk of loss when determining a controlling financial interest, reducing the frequency of the application of related-party guidance when determining a controlling financial interest in a variable interest entity, and changing consolidation conclusions for public and private companies in several industries that typically make use of limited partnerships or VIEs. The amendments in this ASU are effective for periods beginning after December 15, 2015 for public business entities. Early adoption is permitted. We will adopt the guidance effective in the first quarter of 2016 and do not anticipate any significant impact 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. Per ASU 2015-14, Deferral of the Effective Date , this guidance was deferred and is effective for fiscal periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Early adoption is permitted for fiscal periods beginning after December 15, 2016. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2018 using one of two retrospective application methods.

Business Combinations Busines33

Business Combinations Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2015
Business Acquisition [Line Items]
Pro Forma Financial Information for Bancoporiation Acquisition	Year ended December 31 (Dollars in thousands, unaudited) 2014 Total revenue (interest income plus noninterest income) $ 1,336,340 Net loss $ (13,171 )
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
Capitol City Bank and Trust
Business Acquisition [Line Items]
Schedule of Assets Acquired and Liabilities Assumed	The following table provides the identifiable assets acquired and liabilities assumed at their estimated fair values as of the acquisition date. (Dollars in thousands) As recorded by FCB Assets Cash and cash equivalents $ 19,622 Investment securities 35,413 Loans 154,496 Intangible assets 690 Other assets 1,714 Total assets acquired 211,935 Liabilities Deposits 266,352 Short-term borrowings 5,501 Other liabilities 667 Total liabilities assumed 272,520 Fair value of net liabilities assumed (60,585 ) Cash received from FDIC 103,515 Gain on acquisition of CCBT $ 42,930

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Investments [Abstract]
Aggregate Values And Unrealized Gains And Losses Of Investment Securities	The amortized cost and fair value of investment securities classified as available for sale and held to maturity at December 31, 2015 and 2014 , were as follows: December 31, 2015 (Dollars in thousands) Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities available for sale U.S. Treasury $ 1,675,996 $ 4 $ 1,118 $ 1,674,882 Government agency 498,804 230 374 498,660 Mortgage-backed securities 4,692,447 5,120 29,369 4,668,198 Equity securities 7,935 968 10 8,893 Other 10,615 45 — 10,660 Total investment securities available for sale $ 6,885,797 $ 6,367 $ 30,871 $ 6,861,293 December 31, 2014 Cost Gross unrealized gains Gross unrealized losses Fair value 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, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities held to maturity Mortgage-backed securities $ 255 $ 10 $ — $ 265 December 31, 2014 Cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities $ 518 $ 26 $ — $ 544
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, 2015 December 31, 2014 (Dollars in thousands) Cost Fair value Cost Fair value Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 1,255,714 $ 1,255,094 $ 447,866 $ 447,992 One through five years 919,086 918,448 3,087,521 3,090,621 Five through 10 years 8,500 8,500 — — Over 10 years 2,115 2,160 — — Mortgage-backed securities 4,692,447 4,668,198 3,628,187 3,633,304 Equity securities 7,935 8,893 — — Total investment securities available for sale $ 6,885,797 $ 6,861,293 $ 7,163,574 $ 7,171,917 Investment securities held to maturity Mortgage-backed securities held to maturity $ 255 $ 265 $ 518 $ 544
Securities Gains (Losses)	For each period presented, securities gains (losses) include the following: Year ended December 31 (Dollars in thousands) 2015 2014 2013 Gross gains on retirement/sales of investment securities available for sale $ 10,834 $ 29,129 $ — Gross losses on sales of investment securities available for sale (17 ) (33 ) — Total securities gains $ 10,817 $ 29,096 $ —
Investment Securities With Unrealized Losses	The following table provides information regarding securities with unrealized losses as of December 31, 2015 and 2014 : December 31, 2015 Less than 12 months 12 months or more Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment securities available for sale: U.S. Treasury $ 1,539,637 $ 1,118 $ — $ — $ 1,539,637 $ 1,118 Government agency 229,436 374 — — 229,436 374 Mortgage-backed securities 3,570,470 23,275 280,126 6,094 3,850,596 29,369 Equity securities 728 10 — — 728 10 Other — — — — — — Total $ 5,340,271 $ 24,777 $ 280,126 $ 6,094 $ 5,620,397 $ 30,871 December 31, 2014 Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized 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

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 December 31, 2014 Non-PCI loans and leases: Commercial: Construction and land development $ 620,352 $ 493,133 Commercial mortgage 8,274,548 7,552,948 Other commercial real estate 321,021 244,875 Commercial and industrial 2,368,958 1,988,934 Lease financing 730,778 571,916 Other 314,832 353,833 Total commercial loans 12,630,489 11,205,639 Noncommercial: Residential mortgage 2,695,985 2,493,058 Revolving mortgage 2,523,106 2,561,800 Construction and land development 220,073 205,016 Consumer 1,219,821 1,117,454 Total noncommercial loans 6,658,985 6,377,328 Total non-PCI loans and leases 19,289,474 17,582,967 PCI loans: Commercial: Construction and land development $ 33,880 $ 78,079 Commercial mortgage 525,468 577,518 Other commercial real estate 17,076 40,193 Commercial and industrial 15,182 27,254 Other 2,008 3,079 Total commercial loans 593,614 726,123 Noncommercial: Residential mortgage 302,158 382,340 Revolving mortgage 52,471 74,109 Construction and land development — 912 Consumer 2,273 3,014 Total noncommercial loans 356,902 460,375 Total PCI loans 950,516 1,186,498 Total loans and leases $ 20,239,990 $ 18,769,465
Composition Of The Loans And Leases Outstanding By Credit Quality Indicator	The composition of the loans and leases outstanding at December 31, 2015 , and December 31, 2014 , by credit quality indicator is provided below: Non-PCI commercial loans and leases (Dollars in thousands) Construction and land development Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Total non-PCI commercial loans and leases Grade: December 31, 2015 Pass $ 611,314 $ 8,024,831 $ 318,187 $ 2,219,606 $ 719,338 $ 311,401 $ 12,204,677 Special mention 5,191 100,220 475 19,361 4,869 1,905 132,021 Substandard 3,847 146,071 959 21,322 6,375 1,526 180,100 Doubtful — 599 — 408 169 — 1,176 Ungraded — 2,827 1,400 108,261 27 — 112,515 Total $ 620,352 $ 8,274,548 $ 321,021 $ 2,368,958 $ 730,778 $ 314,832 $ 12,630,489 December 31, 2014 Pass $ 474,374 $ 7,284,714 $ 242,053 $ 1,859,415 $ 564,319 $ 349,111 $ 10,773,986 Special mention 13,927 129,247 909 27,683 3,205 1,384 176,355 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 $ 493,133 $ 7,552,948 $ 244,875 $ 1,988,934 $ 571,916 $ 353,833 $ 11,205,639 Non-PCI noncommercial loans and leases (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer Total non-PCI noncommercial December 31, 2015 Current $ 2,651,209 $ 2,502,065 $ 214,555 $ 1,210,832 $ 6,578,661 30-59 days past due 23,960 11,706 3,211 5,545 44,422 60-89 days past due 7,536 3,704 669 1,822 13,731 90 days or greater past due 13,280 5,631 1,638 1,622 22,171 Total $ 2,695,985 $ 2,523,106 $ 220,073 $ 1,219,821 $ 6,658,985 December 31, 2014 Current $ 2,454,797 $ 2,542,807 $ 202,344 $ 1,110,153 $ 6,310,101 30-59 days past due 23,288 11,097 1,646 4,577 40,608 60-89 days past due 6,018 2,433 824 1,619 10,894 90 days or greater past due 8,955 5,463 202 1,105 15,725 Total $ 2,493,058 $ 2,561,800 $ 205,016 $ 1,117,454 $ 6,377,328 PCI commercial loans (Dollars in thousands) Construction and land development Commercial mortgage Other commercial real estate Commercial and industrial Other Total PCI commercial loans Grade: December 31, 2015 Pass $ 14,710 $ 262,579 $ 7,366 $ 9,302 $ 706 $ 294,663 Special mention 758 87,870 60 937 — 89,625 Substandard 14,131 163,801 9,229 4,588 1,302 193,051 Doubtful 4,281 10,875 — 282 — 15,438 Ungraded — 343 421 73 — 837 Total $ 33,880 $ 525,468 $ 17,076 $ 15,182 $ 2,008 $ 593,614 December 31, 2014 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 PCI noncommercial loans (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer Total PCI noncommercial December 31, 2015 Current $ 257,207 $ 47,901 $ — $ 1,981 $ 307,089 30-59 days past due 12,318 1,127 — 86 13,531 60-89 days past due 4,441 501 — 132 5,074 90 days or greater past due 28,192 2,942 — 74 31,208 Total $ 302,158 $ 52,471 $ — $ 2,273 $ 356,902 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
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, 2015 , and December 31, 2014 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 as 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, 2015 (Dollars in thousands) 30-59 days past due 60-89 days past due 90 days or greater Total past due Current Total loans and leases Non-PCI loans and leases: Construction and land development - commercial $ 987 $ 283 $ 463 $ 1,733 $ 618,619 $ 620,352 Commercial mortgage 13,023 3,446 14,495 30,964 8,243,584 8,274,548 Other commercial real estate 884 — 142 1,026 319,995 321,021 Commercial and industrial 2,133 1,079 1,780 4,992 2,363,966 2,368,958 Lease financing 2,070 2 164 2,236 728,542 730,778 Residential mortgage 23,960 7,536 13,280 44,776 2,651,209 2,695,985 Revolving mortgage 11,706 3,704 5,631 21,041 2,502,065 2,523,106 Construction and land development - noncommercial 3,211 669 1,638 5,518 214,555 220,073 Consumer 5,545 1,822 1,622 8,989 1,210,832 1,219,821 Other 3 164 134 301 314,531 314,832 Total non-PCI loans and leases $ 63,522 $ 18,705 $ 39,349 $ 121,576 $ 19,167,898 $ 19,289,474 December 31, 2014 30-59 days past due 60-89 days past due 90 days or greater Total past due Current Total loans and leases Non-PCI loans and leases: Construction and land development - commercial $ 520 $ 283 $ 330 $ 1,133 $ 492,000 $ 493,133 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 2,454,797 2,493,058 Revolving mortgage 11,097 2,433 5,463 18,993 2,542,807 2,561,800 Construction and land development - noncommercial 1,646 824 202 2,672 202,344 205,016 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
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, 2015 and December 31, 2014 for non-PCI loans, were as follows: December 31, 2015 December 31, 2014 (Dollars in thousands) Nonaccrual loans and leases Loans and leases > 90 days and accruing Nonaccrual loans and leases Loans and leases > 90 days and accruing Non-PCI loans and leases: Construction and land development - commercial $ 425 $ 273 $ 343 $ 56 Commercial mortgage 42,116 242 24,720 1,003 Commercial and industrial 6,235 953 1,741 239 Lease financing 389 — 374 2 Other commercial real estate 239 — 619 35 Construction and land development - noncommercial 2,164 — — 202 Residential mortgage 29,977 838 14,242 3,191 Revolving mortgage 12,704 — — 5,463 Consumer 1,472 1,007 — 1,059 Other 133 2 1,966 — Total non-PCI loans and leases $ 95,854 $ 3,315 $ 44,005 $ 11,250
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, 2015 and 2014 : (Dollars in thousands) 2015 2014 Balance at January 1 $ 1,186,498 $ 1,029,426 Fair value of PCI loans acquired during the year 154,496 623,408 Accretion 114,580 112,368 Payments received and other changes, net (505,058 ) (578,704 ) Balance at December 31 $ 950,516 $ 1,186,498 Unpaid principal balance at December 31 $ 1,693,372 $ 2,057,691
Changes In The Amount Of Accretable Yield	Purchased non-impaired loans and leases The following table relates to purchased non-impaired loans and leases acquired in the Bancorporation merger for 2014 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) 2014 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 were as follows: (Dollars in thousands) 2014 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 $ 4,175,586

Loans and Leases Schedule of Lo

Loans and Leases Schedule of Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 December 31, 2014 Non-PCI loans and leases: Commercial: Construction and land development $ 620,352 $ 493,133 Commercial mortgage 8,274,548 7,552,948 Other commercial real estate 321,021 244,875 Commercial and industrial 2,368,958 1,988,934 Lease financing 730,778 571,916 Other 314,832 353,833 Total commercial loans 12,630,489 11,205,639 Noncommercial: Residential mortgage 2,695,985 2,493,058 Revolving mortgage 2,523,106 2,561,800 Construction and land development 220,073 205,016 Consumer 1,219,821 1,117,454 Total noncommercial loans 6,658,985 6,377,328 Total non-PCI loans and leases 19,289,474 17,582,967 PCI loans: Commercial: Construction and land development $ 33,880 $ 78,079 Commercial mortgage 525,468 577,518 Other commercial real estate 17,076 40,193 Commercial and industrial 15,182 27,254 Other 2,008 3,079 Total commercial loans 593,614 726,123 Noncommercial: Residential mortgage 302,158 382,340 Revolving mortgage 52,471 74,109 Construction and land development — 912 Consumer 2,273 3,014 Total noncommercial loans 356,902 460,375 Total PCI loans 950,516 1,186,498 Total loans and leases $ 20,239,990 $ 18,769,465

Allowance for Loan and Lease 37

Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Loans and Leases Receivable, Allowance [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, 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 Provision (credit) for loan and lease losses 22,937 (2,273 ) 20,664 Loans and leases charged off (25,304 ) (3,044 ) (28,348 ) Loans and leases recovered 9,434 — 9,434 Net charge-offs (15,870 ) (3,044 ) (18,914 ) Balance at December 31, 2015 $ 189,904 $ 16,312 $ 206,216 (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 years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non- commercial Consumer Non- specific Total Non-PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 4,773 (15,822 ) 1,569 17,432 1,602 (1,420 ) 4,202 (927 ) 541 10,987 — 22,937 Charge-offs (1,012 ) (1,498 ) (178 ) (5,952 ) (402 ) — (1,619 ) (2,925 ) (22 ) (11,696 ) — (25,304 ) Recoveries 566 2,027 45 909 38 91 861 1,173 74 3,650 — 9,434 Balance at December 31, 2015 $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ — $ 189,904 (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 . December 31, 2015 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total Non-PCI Loans Allowance for loan and lease losses: ALLL for loans and leases individually evaluated for impairment $ 123 $ 3,370 $ 289 $ 1,118 $ 213 $ — $ 1,212 $ 299 $ 49 $ 527 $ 7,200 ALLL for loans and leases collectively evaluated for impairment 16,165 66,526 1,879 41,998 5,311 1,855 12,893 15,672 1,436 18,969 182,704 Total allowance for loan and lease losses $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ 189,904 Loans and leases: Loans and leases individually evaluated for impairment $ 3,094 $ 95,107 $ 427 $ 17,910 $ 1,755 $ 1,183 $ 22,986 $ 5,883 $ 784 $ 1,238 $ 150,367 Loans and leases collectively evaluated for impairment 617,258 8,179,441 320,594 2,351,048 729,023 313,649 2,672,999 2,517,223 219,289 1,218,583 19,139,107 Total loan and leases $ 620,352 $ 8,274,548 $ 321,021 $ 2,368,958 $ 730,778 $ 314,832 $ 2,695,985 $ 2,523,106 $ 220,073 $ 1,219,821 $ 19,289,474 December 31, 2014 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total 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 491,513 7,470,145 244,291 1,977,594 571,293 351,833 2,478,145 2,558,125 203,676 1,116,459 17,463,074 Total loan and leases $ 493,133 $ 7,552,948 $ 244,875 $ 1,988,634 $ 571,916 $ 353,833 $ 2,493,058 $ 2,561,800 $ 205,016 $ 1,117,454 $ 17,582,667 For the years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Residential mortgage Revolving mortgage Construction and land development - noncommercial Consumer and other Total PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 1,029 (1,426 ) 698 (470 ) 72 (2,720 ) (183 ) 727 (2,273 ) Charge-offs (97 ) (871 ) — (325 ) (494 ) (756 ) — (501 ) (3,044 ) Recoveries — — — — — — — — — Balance at December 31, 2015 $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 December 31, 2015 ALLL for loans and leases acquired with deteriorated credit quality $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 Loans and leases acquired with deteriorated credit quality 33,880 525,468 17,076 15,182 302,158 52,471 — 4,281 950,516 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 27,254 382,340 74,109 912 6,093 1,186,498
Allowance for Loan and Lease Losses	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, 2015 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance recorded Non-PCI impaired loans and leases Construction and land development - commercial $ 1,623 $ 1,471 $ 3,094 $ 4,428 $ 123 Commercial mortgage 41,793 53,314 95,107 103,763 3,370 Other commercial real estate 305 122 427 863 289 Commercial and industrial 8,544 9,366 17,910 21,455 1,118 Lease financing 1,651 104 1,755 1,956 213 Other — 1,183 1,183 1,260 — Residential mortgage 10,097 12,889 22,986 25,043 1,212 Revolving mortgage 1,105 4,778 5,883 7,120 299 Construction and land development - noncommercial 693 91 784 784 49 Consumer 1,050 188 1,238 1,294 527 Total non-PCI impaired loans and leases $ 66,861 $ 83,506 $ 150,367 $ 167,966 $ 7,200 December 31, 2014 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance 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 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, 2015 , 2014 and 2013 : Year ended December 31, 2015 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 3,164 $ 146 Commercial mortgage 89,934 3,129 Other commercial real estate 481 12 Commercial and industrial 14,587 510 Lease financing 1,718 74 Other 1,673 37 Residential mortgage 18,524 557 Revolving mortgage 4,368 97 Construction and land development - noncommercial 829 38 Consumer 1,126 75 Total non-PCI impaired loans and leases $ 136,404 $ 4,675 Year ended December 31, 2014 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 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, 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 Provision (credit) for loan and lease losses 22,937 (2,273 ) 20,664 Loans and leases charged off (25,304 ) (3,044 ) (28,348 ) Loans and leases recovered 9,434 — 9,434 Net charge-offs (15,870 ) (3,044 ) (18,914 ) Balance at December 31, 2015 $ 189,904 $ 16,312 $ 206,216 (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 years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non- commercial Consumer Non- specific Total Non-PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 4,773 (15,822 ) 1,569 17,432 1,602 (1,420 ) 4,202 (927 ) 541 10,987 — 22,937 Charge-offs (1,012 ) (1,498 ) (178 ) (5,952 ) (402 ) — (1,619 ) (2,925 ) (22 ) (11,696 ) — (25,304 ) Recoveries 566 2,027 45 909 38 91 861 1,173 74 3,650 — 9,434 Balance at December 31, 2015 $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ — $ 189,904 (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 . December 31, 2015 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total Non-PCI Loans Allowance for loan and lease losses: ALLL for loans and leases individually evaluated for impairment $ 123 $ 3,370 $ 289 $ 1,118 $ 213 $ — $ 1,212 $ 299 $ 49 $ 527 $ 7,200 ALLL for loans and leases collectively evaluated for impairment 16,165 66,526 1,879 41,998 5,311 1,855 12,893 15,672 1,436 18,969 182,704 Total allowance for loan and lease losses $ 16,288 $ 69,896 $ 2,168 $ 43,116 $ 5,524 $ 1,855 $ 14,105 $ 15,971 $ 1,485 $ 19,496 $ 189,904 Loans and leases: Loans and leases individually evaluated for impairment $ 3,094 $ 95,107 $ 427 $ 17,910 $ 1,755 $ 1,183 $ 22,986 $ 5,883 $ 784 $ 1,238 $ 150,367 Loans and leases collectively evaluated for impairment 617,258 8,179,441 320,594 2,351,048 729,023 313,649 2,672,999 2,517,223 219,289 1,218,583 19,139,107 Total loan and leases $ 620,352 $ 8,274,548 $ 321,021 $ 2,368,958 $ 730,778 $ 314,832 $ 2,695,985 $ 2,523,106 $ 220,073 $ 1,219,821 $ 19,289,474 December 31, 2014 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Lease financing Other Residential mortgage Revolving mortgage Construction and land development - non-commercial Consumer Total 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 491,513 7,470,145 244,291 1,977,594 571,293 351,833 2,478,145 2,558,125 203,676 1,116,459 17,463,074 Total loan and leases $ 493,133 $ 7,552,948 $ 244,875 $ 1,988,634 $ 571,916 $ 353,833 $ 2,493,058 $ 2,561,800 $ 205,016 $ 1,117,454 $ 17,582,667 For the years ended December 31, 2015, 2014 and 2013 (Dollars in thousands) Construction and land development - commercial Commercial mortgage Other commercial real estate Commercial and industrial Residential mortgage Revolving mortgage Construction and land development - noncommercial Consumer and other Total PCI Loans Allowance for loan and lease losses: Balance at January 1, 2013 $ 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 Provision (credits) 1,029 (1,426 ) 698 (470 ) 72 (2,720 ) (183 ) 727 (2,273 ) Charge-offs (97 ) (871 ) — (325 ) (494 ) (756 ) — (501 ) (3,044 ) Recoveries — — — — — — — — — Balance at December 31, 2015 $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 December 31, 2015 ALLL for loans and leases acquired with deteriorated credit quality $ 1,082 $ 7,838 $ 773 $ 445 $ 5,398 $ 523 $ — $ 253 $ 16,312 Loans and leases acquired with deteriorated credit quality 33,880 525,468 17,076 15,182 302,158 52,471 — 4,281 950,516 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 27,254 382,340 74,109 912 6,093 1,186,498 At December 31, 2015 and December 31, 2014 , $469.3 million and $285.6 million , respectively, in PCI loans experienced an adverse change in expected cash flows since the date of acquisition. The corresponding valuation reserve was $16.3 million and $21.6 million , respectively. 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, 2015 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance recorded Non-PCI impaired loans and leases Construction and land development - commercial $ 1,623 $ 1,471 $ 3,094 $ 4,428 $ 123 Commercial mortgage 41,793 53,314 95,107 103,763 3,370 Other commercial real estate 305 122 427 863 289 Commercial and industrial 8,544 9,366 17,910 21,455 1,118 Lease financing 1,651 104 1,755 1,956 213 Other — 1,183 1,183 1,260 — Residential mortgage 10,097 12,889 22,986 25,043 1,212 Revolving mortgage 1,105 4,778 5,883 7,120 299 Construction and land development - noncommercial 693 91 784 784 49 Consumer 1,050 188 1,238 1,294 527 Total non-PCI impaired loans and leases $ 66,861 $ 83,506 $ 150,367 $ 167,966 $ 7,200 December 31, 2014 (Dollars in thousands) With a recorded allowance With no recorded allowance Total Unpaid Related allowance 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 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, 2015 , 2014 and 2013 : Year ended December 31, 2015 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 3,164 $ 146 Commercial mortgage 89,934 3,129 Other commercial real estate 481 12 Commercial and industrial 14,587 510 Lease financing 1,718 74 Other 1,673 37 Residential mortgage 18,524 557 Revolving mortgage 4,368 97 Construction and land development - noncommercial 829 38 Consumer 1,126 75 Total non-PCI impaired loans and leases $ 136,404 $ 4,675 Year ended December 31, 2014 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 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 , 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, 2015 December 31, 2014 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans Construction and land development - commercial $ 3,624 $ 257 $ 3,881 $ 2,591 $ 446 $ 3,037 Commercial mortgage 65,812 18,728 84,540 92,184 8,937 101,121 Other commercial real estate 1,751 89 1,840 2,374 449 2,823 Commercial and industrial 8,833 3,341 12,174 9,864 664 10,528 Lease 1,191 169 1,360 258 365 623 Other 1,183 — 1,183 34 — 34 Total commercial loans 82,394 22,584 104,978 107,305 10,861 118,166 Noncommercial Residential 25,427 7,129 32,556 22,597 4,655 27,252 Revolving mortgage 3,600 1,705 5,305 3,675 — 3,675 Construction and land development - noncommercial 784 — 784 1,391 — 1,391 Consumer and other 1,091 129 1,220 995 — 995 Total noncommercial loans 30,902 8,963 39,865 28,658 4,655 33,313 Total loans $ 113,296 $ 31,547 $ 144,843 $ 135,963 $ 15,516 $ 151,479 Total troubled debt restructurings at December 31, 2015 , were $144.8 million , of which $30.6 million were PCI and $114.2 million were non-PCI. TDRs at December 31, 2014 , were $151.5 million , which consisted of $46.9 million PCI and $104.6 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 projecting 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 or analysis of cash flows. The following tables provide the types of TDRs made during the year ended December 31, 2015 , and 2014 , as well as a summary of loans that were modified as a TDR during the year ended December 31, 2015 , and 2014 that subsequently defaulted during the year ended December 31, 2015 , and 2014 . 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, 2015 Year ended December 31, 2014 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 3 $ 185 — $ — 6 $ 1,973 2 $ 364 Commercial and industrial 2 776 — — 3 250 — — Lease financing — — — — 2 118 — — Construction and land development - noncommercial 1 91 — — — — — — Other — — — — 1 34 — — Total interest only 6 1,052 — — 12 2,375 2 364 Loan term extension Construction and land development - commercial 1 18 1 18 2 187 — — Commercial mortgage 12 3,144 2 316 18 4,848 — — Commercial and industrial 5 1,380 — — 5 2,274 — — Lease financing 4 146 — — 6 198 — — Residential mortgage 1 110 — — 19 572 — — Revolving mortgage 1 8 — — — — — — Construction and land development - noncommercial — — — — 7 226 — — Consumer 3 52 — 6 99 1 — Total loan term extension 27 4,858 3 334 63 8,404 1 — Below market interest rate Construction and land development - commercial 21 992 3 122 11 372 — — Commercial mortgage 37 13,900 3 3,969 44 12,642 3 441 Commercial and industrial 15 2,301 2 1,619 13 751 — — Other commercial real estate 2 122 — — 1 337 — — Residential mortgage 116 5,695 14 607 41 2,444 1 45 Revolving mortgage 6 136 — — 5 217 — — Construction & land development - noncommercial 2 253 — — 12 389 — — Consumer 18 146 2 10 10 193 — — Other 1 1,183 — — — — — — Total below market interest rate 218 24,728 24 6,327 137 17,345 4 486 Discharged from bankruptcy Construction and land development - commercial 4 38 1 3 — — — — Commercial mortgage 4 1,897 2 644 2 949 1 — Commercial and industrial 3 146 — — — — — — Residential mortgage 29 1,454 4 242 12 1,067 2 268 Revolving mortgage 56 2,714 9 701 17 663 1 — Construction & land development - noncommercial — — — — 1 62 1 62 Consumer 25 296 7 75 4 4 — — Total discharged from bankruptcy 121 6,545 23 1,665 36 2,745 5 330 Total non-PCI restructurings 372 $ 37,183 50 $ 8,326 248 $ 30,869 12 $ 1,180 Year ended December 31, 2015 Year ended December 31, 2014 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 Commercial mortgage — $ — — $ — 2 $ — 2 $ — Total interest only — — — — 2 — 2 — Loan term extension Construction and land development - commercial — — — — 1 332 — — Residential mortgage 1 178 — — 2 317 5 53 Construction and land development - noncommercial — — — — 1 51 — — Total loan term extension 1 178 — — 4 700 5 53 Below market interest rate Construction and land development - commercial — — — — 2 116 — — Commercial mortgage — — — — 16 5,783 3 138 Residential mortgage 14 1,187 2 96 29 3,948 3 23 Total below market interest rate 14 1,187 2 96 47 9,847 6 161 Discharged from bankruptcy Residential mortgage 2 282 — — 26 1,659 2 — Revolving mortgage 1 105 — — — — — — Total discharged from bankruptcy 3 387 — — 26 1,659 2 — Total PCI restructurings 18 $ 1,752 2 $ 96 79 $ 12,206 15 $ 214
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, 2015 December 31, 2014 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans Construction and land development - commercial $ 3,624 $ 257 $ 3,881 $ 2,591 $ 446 $ 3,037 Commercial mortgage 65,812 18,728 84,540 92,184 8,937 101,121 Other commercial real estate 1,751 89 1,840 2,374 449 2,823 Commercial and industrial 8,833 3,341 12,174 9,864 664 10,528 Lease 1,191 169 1,360 258 365 623 Other 1,183 — 1,183 34 — 34 Total commercial loans 82,394 22,584 104,978 107,305 10,861 118,166 Noncommercial Residential 25,427 7,129 32,556 22,597 4,655 27,252 Revolving mortgage 3,600 1,705 5,305 3,675 — 3,675 Construction and land development - noncommercial 784 — 784 1,391 — 1,391 Consumer and other 1,091 129 1,220 995 — 995 Total noncommercial loans 30,902 8,963 39,865 28,658 4,655 33,313 Total loans $ 113,296 $ 31,547 $ 144,843 $ 135,963 $ 15,516 $ 151,479
Troubled Debt Restructurings on Financing Receivables	The following tables provide the types of TDRs made during the year ended December 31, 2015 , and 2014 , as well as a summary of loans that were modified as a TDR during the year ended December 31, 2015 , and 2014 that subsequently defaulted during the year ended December 31, 2015 , and 2014 . 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, 2015 Year ended December 31, 2014 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 3 $ 185 — $ — 6 $ 1,973 2 $ 364 Commercial and industrial 2 776 — — 3 250 — — Lease financing — — — — 2 118 — — Construction and land development - noncommercial 1 91 — — — — — — Other — — — — 1 34 — — Total interest only 6 1,052 — — 12 2,375 2 364 Loan term extension Construction and land development - commercial 1 18 1 18 2 187 — — Commercial mortgage 12 3,144 2 316 18 4,848 — — Commercial and industrial 5 1,380 — — 5 2,274 — — Lease financing 4 146 — — 6 198 — — Residential mortgage 1 110 — — 19 572 — — Revolving mortgage 1 8 — — — — — — Construction and land development - noncommercial — — — — 7 226 — — Consumer 3 52 — 6 99 1 — Total loan term extension 27 4,858 3 334 63 8,404 1 — Below market interest rate Construction and land development - commercial 21 992 3 122 11 372 — — Commercial mortgage 37 13,900 3 3,969 44 12,642 3 441 Commercial and industrial 15 2,301 2 1,619 13 751 — — Other commercial real estate 2 122 — — 1 337 — — Residential mortgage 116 5,695 14 607 41 2,444 1 45 Revolving mortgage 6 136 — — 5 217 — — Construction & land development - noncommercial 2 253 — — 12 389 — — Consumer 18 146 2 10 10 193 — — Other 1 1,183 — — — — — — Total below market interest rate 218 24,728 24 6,327 137 17,345 4 486 Discharged from bankruptcy Construction and land development - commercial 4 38 1 3 — — — — Commercial mortgage 4 1,897 2 644 2 949 1 — Commercial and industrial 3 146 — — — — — — Residential mortgage 29 1,454 4 242 12 1,067 2 268 Revolving mortgage 56 2,714 9 701 17 663 1 — Construction & land development - noncommercial — — — — 1 62 1 62 Consumer 25 296 7 75 4 4 — — Total discharged from bankruptcy 121 6,545 23 1,665 36 2,745 5 330 Total non-PCI restructurings 372 $ 37,183 50 $ 8,326 248 $ 30,869 12 $ 1,180 Year ended December 31, 2015 Year ended December 31, 2014 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 Commercial mortgage — $ — — $ — 2 $ — 2 $ — Total interest only — — — — 2 — 2 — Loan term extension Construction and land development - commercial — — — — 1 332 — — Residential mortgage 1 178 — — 2 317 5 53 Construction and land development - noncommercial — — — — 1 51 — — Total loan term extension 1 178 — — 4 700 5 53 Below market interest rate Construction and land development - commercial — — — — 2 116 — — Commercial mortgage — — — — 16 5,783 3 138 Residential mortgage 14 1,187 2 96 29 3,948 3 23 Total below market interest rate 14 1,187 2 96 47 9,847 6 161 Discharged from bankruptcy Residential mortgage 2 282 — — 26 1,659 2 — Revolving mortgage 1 105 — — — — — — Total discharged from bankruptcy 3 387 — — 26 1,659 2 — Total PCI restructurings 18 $ 1,752 2 $ 96 79 $ 12,206 15 $ 214

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	Major classifications of premises and equipment at December 31, 2015 and 2014 are summarized as follows: (Dollars in thousands) 2015 2014 Land $ 279,932 $ 284,682 Premises and leasehold improvements 1,089,644 1,056,126 Furniture and equipment 441,378 444,774 Total 1,810,954 1,785,582 Less accumulated depreciation and amortization 675,125 660,501 Total premises and equipment $ 1,135,829 $ 1,125,081
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, 2015 : (Dollars in thousands) Year ended December 31 2016 $ 18,543 2017 14,415 2018 11,017 2019 8,040 2020 5,589 Thereafter 43,407 Total minimum payments $ 101,011

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Changes in Other Real Estate Owned	The following table explains changes in other real estate owned during 2015 and 2014 . (Dollars in thousands) Covered Noncovered Total Balance at January 1, 2014 $ 47,081 $ 36,898 $ 83,979 Additions 29,708 36,574 66,282 Additions acquired in the Bancorporation merger 1,336 34,008 35,344 Additions acquired in the 1st Financial merger — 11,591 11,591 Sales (38,753 ) (48,935 ) (87,688 ) Writedowns (10,853 ) (5,219 ) (16,072 ) Transfers (1) (5,537 ) 5,537 — Balance at December 31, 2014 22,982 70,454 93,436 Additions 7,357 47,866 55,223 Sales (19,629 ) (56,853 ) (76,482 ) Writedowns (1,478 ) (5,140 ) (6,618 ) Transfers (1) (2,415 ) 2,415 — Balance at December 31, 2015 $ 6,817 $ 58,742 $ 65,559 (1) Transfers include OREO balances associated with expired loss share agreements. At December 31, 2015 and December 31, 2014 , BancShares had $16.1 million and $29.0 million , respectively, of foreclosed residential real estate property in OREO. The recorded investment in consumer mortgage loans collateralized by residential real estate property in the process of foreclosure totaled $15.6 million and $24.8 million at December 31, 2015 and December 31, 2014 , respectively.

Receivable from FDIC for Loss40

Receivable from FDIC for Loss Share Agreements (Tables)	12 Months Ended
	Dec. 31, 2015
FDIC Loss Share Receivable [Abstract]
Changes in Receivable From FDIC	The following table provides changes in the receivable from the FDIC for the years ended December 31, 2015, 2014 and 2013: Year ended December 31 (Dollars in thousands) 2015 2014 2013 Balance at January 1 $ 28,701 $ 93,397 $ 270,192 Additional receivable from Bancorporation merger — 5,106 — Amortization (10,899 ) (43,422 ) (85,651 ) Net cash payments to (from) the FDIC 33,296 1,286 (19,373 ) Post-acquisition adjustments (47,044 ) (27,666 ) (71,771 ) Balance at December 31 $ 4,054 $ 28,701 $ 93,397

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposits	Deposits at December 31 are summarized as follows: (Dollars in thousands) 2015 2014 Demand $ 9,274,470 $ 8,086,784 Checking with interest 4,445,353 4,091,333 Money market accounts 8,205,705 8,264,811 Savings 1,909,021 1,728,504 Time 3,096,206 3,507,145 Total deposits $ 26,930,755 $ 25,678,577
Maturities Of Time Deposits	At December 31, 2015 , the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2016 $ 2,359,710 2017 453,560 2018 114,448 2019 111,857 2020 56,631 Thereafter — Total time deposits $ 3,096,206

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Schedule of Short-term Debt	Short-term borrowings at December 31 are as follows: (Dollars in thousands) 2015 2014 Master notes $ — $ 410,258 Repurchase agreements 592,182 294,426 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 $ 594,733 $ 987,184

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2015
Repurchase Agreements [Abstract]
Schedule of Repurchase Agreements [Table Text Block]	The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in short-term borrowings in the Consolidated Balance Sheets as of December 31, 2015 and December 31, 2014 is presented in the following tables. December 31, 2015 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements: U.S. Treasury $ 592,182 $ — $ — $ 25,724 $ 617,906 Government agency — — — 4,276 4,276 Total borrowings $ 592,182 $ — $ — $ 30,000 $ 622,182 Gross amount of recognized liabilities for repurchase agreements $ 622,182 December 31, 2014 Remaining Contractual Maturity of the Agreements Overnight and continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements: U.S. Treasury $ 162,925 $ — $ — $ 23,086 $ 186,011 Government agency — — — 6,914 6,914 Mortgage-backed securities 131,501 — — — 131,501 Total borrowings $ 294,426 $ — $ — $ 30,000 $ 324,426 Gross amount of recognized liabilities for repurchase agreements $ 324,426

Long-Term Obligations (Tables)

Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2015
Long-term Obligations [Abstract]
Schedule of Long-term Debt Instruments	Long-term obligations at December 31 include: (Dollars in thousands) 2015 2014 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 25,774 26,547 Junior subordinated debenture at 3-month LIBOR plus 2.85 percent maturing April 7, 2034 10,310 10,310 Subordinated notes payable 8.00 percent June 1, 2018 15,000 15,000 Obligations under capitalized leases extending to July 2026 9,226 3,150 Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through March 2024 510,252 160,268 Note payable to the Federal Home Loan Bank of Des Moines (1) with a rate of 4.74 percent and a maturity date of July 2017 10,000 10,000 Unamortized purchase accounting adjustments (2,907 ) (466 ) Other long-term debt 30,108 30,119 Total long-term obligations $ 704,155 $ 351,320
Schedule of Maturities of Long-term Debt	Long-term obligations maturing in each of the five years subsequent to December 31, 2015 and thereafter, include: Year ended December 31 2016 $ 3,401 2017 13,440 2018 135,232 2019 246 2020 261 Thereafter 551,575 Total long-term obligations $ 704,155

Estimated Fair Values (Tables)

Estimated Fair Values (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 and December 31, 2014 . 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. Cash and due from banks is classified on the fair value hierarchy as level 1. Overnight investments, income earned not collected, short-term borrowings and accrued interest payable are considered level 2. Lastly, the receivable from the FDIC for loss share agreements is designated as level 3. December 31, 2015 December 31, 2014 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 534,086 $ 534,086 $ 604,182 $ 604,182 Overnight investments 2,063,132 2,063,132 1,724,919 1,724,919 Investment securities available for sale 6,861,293 6,861,293 7,171,917 7,171,917 Investment securities held to maturity 255 265 518 544 Loans held for sale 59,766 59,766 63,696 63,696 Net loans and leases 20,033,774 19,353,325 18,564,999 18,046,497 Receivable from the FDIC for loss share agreements (1) 4,054 4,054 28,701 18,218 Income earned not collected 70,036 70,036 57,254 57,254 Federal Home Loan Bank stock 37,511 37,511 39,113 39,113 Mortgage servicing rights 19,351 19,495 16,688 16,736 Deposits 26,930,755 26,164,472 25,678,577 25,164,683 Short-term borrowings 594,733 594,733 987,184 987,184 Long-term obligations 704,155 718,102 351,320 367,732 Payable to the FDIC for loss share agreements 126,453 131,894 116,535 122,168 Accrued interest payable 5,713 5,713 8,194 8,194 Interest rate swap 1,429 1,429 4,337 4,337 (1) At December 31, 2015, the carrying value of the FDIC receivable approximates the fair value due to the short-term nature of the majority of loss share agreements. At December 31, 2014, the fair value of the FDIC receivable is estimated based on discounted future cash flows using current discount rates and 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 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, 2015 and 2014 . December 31, 2015 (Dollars in thousands) Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 59,766 $ 58,890 $ 876 December 31, 2014 Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 63,696 $ 62,996 $ 700 No loans held for sale were 90 or more days past due or on nonaccrual status as of December 31, 2015 and 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 years ended December 31, 2015 and 2014 . Year ended December 31 (Dollars in thousands) 2015 2014 Gains (losses) from fair value changes on loans held for sale $ 176 $ 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, 2015 and December 31, 2014 . December 31, 2015 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Impaired loans 64,197 — — 64,197 Other real estate not covered under loss share agreements remeasured during current year 44,571 — — 44,571 Other real estate covered under loss share agreements remeasured during current year 4,403 — — 4,403 Mortgage servicing rights 17,997 — — 17,997 December 31, 2014 Fair value measurements using: 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

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive (loss) income included the following at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive income (loss) Deferred tax expense (benefit) Accumulated other comprehensive income (loss), net of tax Unrealized (losses) gains on investment securities available for sale $ (24,504 ) $ (9,379 ) $ (15,125 ) $ 8,343 $ 3,245 $ 5,098 Unrealized loss on cash flow hedge (1,429 ) (537 ) (892 ) (4,337 ) (1,673 ) (2,664 ) Funded status of defined benefit plan (78,419 ) (29,996 ) (48,423 ) (90,696 ) (35,281 ) (55,415 ) Total $ (104,352 ) $ (39,912 ) $ (64,440 ) $ (86,690 ) $ (33,709 ) $ (52,981 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2015 and 2014 : (Dollars in thousands) Unrealized gains (losses) on available-for-sale securities (1) Gains (losses) on cash flow hedges (1) Defined benefit pension items (1) Total Balance at January 1, 2014 $ (10,091 ) $ (4,434 ) $ (10,743 ) $ (25,268 ) Other comprehensive income (loss) before reclassifications 33,061 1,770 (47,946 ) (13,115 ) Amounts reclassified from accumulated other comprehensive (loss) income (17,872 ) — 3,274 (14,598 ) 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 ) Other comprehensive income (loss) before reclassifications (13,544 ) 1,772 394 (11,378 ) Amounts reclassified from accumulated other comprehensive (loss) income (6,679 ) — 6,598 (81 ) Net current period other comprehensive (loss) income (20,223 ) 1,772 6,992 (11,459 ) Balance at December 31, 2015 $ (15,125 ) $ (892 ) $ (48,423 ) $ (64,440 ) (1) All amounts are net of tax. Amounts in parentheses indicate debits.
Schedule of Expected Benefit Payments	Cash Flows Following are estimated payments to pension plan participants in the indicated periods for e
Deferred Benefit Plans Liability Rollforward	The following table provides the accrued liability as of December 31, 2015 and 2014 , and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2015 2014 Present value of accrued liability as of January 1 $ 43,211 $ 23,960 Benefits acquired in the 1st Financial merger — 1,455 Benefits acquired in the Bancorporation merger — 17,333 Benefit expense and interest cost 1,386 2,682 Benefits paid (4,485 ) (2,219 ) Benefits forfeited (234 ) — Present value of accrued liability as of December 31 $ 39,878 $ 43,211 Discount rate at December 31 4.68 % 4.27 %
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, 2015 and 2014 . (Dollars in thousands) 2015 2014 Change in benefit obligation Projected benefit obligation at January 1 $ 627,645 $ 530,678 Service cost 14,083 12,332 Interest cost 26,975 25,615 Actuarial (gain) loss (39,002 ) 76,122 Benefits paid (18,199 ) (17,102 ) Projected benefit obligation at December 31 611,502 627,645 Change in plan assets Fair value of plan assets at January 1 544,956 524,017 Actual return on plan assets (6,732 ) 38,041 Employer contributions 30,000 — Benefits paid (18,199 ) (17,102 ) Fair value of plan assets at December 31 550,025 544,956 Funded status at December 31 $ (61,477 ) $ (82,689 )
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets at December 31, 2015 and 2014 consist of: (Dollars in thousands) 2015 2014 Other assets $ — $ — Other liabilities (61,477 ) (82,689 ) Net asset (liability) recognized $ (61,477 ) $ (82,689 )
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, 2015 and 2014 . (Dollars in thousands) 2015 2014 Net loss $ 70,358 $ 80,806 Less prior service cost 556 767 Accumulated other comprehensive loss, excluding income taxes $ 70,914 $ 81,573
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The following table provides expected amortization amounts for 2016 . (Dollars in thousands) Actuarial loss $ 6,398 Prior service cost 210 Total $ 6,608
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, 2015, 2014 and 2013 . Year ended December 31 (Dollars in thousands) 2015 2014 2013 Service cost $ 14,083 $ 12,332 $ 16,332 Interest cost 26,975 25,615 23,686 Expected return on assets (33,198 ) (31,269 ) (27,733 ) Amortization of prior service cost 210 210 210 Amortization of net actuarial loss 11,376 5,148 16,985 Total net periodic benefit cost 19,446 12,036 29,480 Current year actuarial loss (gain) 927 69,349 (123,557 ) Amortization of actuarial loss (11,376 ) (5,148 ) (16,985 ) Amortization of prior service cost (210 ) (210 ) (210 ) Total recognized in other comprehensive income (10,659 ) 63,991 (140,752 ) Total recognized in net periodic benefit cost and other comprehensive income $ 8,787 $ 76,027 $ (111,272 )
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations at December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.68 % 4.27 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2015, 2014 and 2013 , are as follows: (Dollars in thousands) 2015 2014 2013 Discount rate 4.27 % 4.90 % 4.00 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 7.50 7.25
Schedule of Fair Value and Allocation of Plan Assets	The fair values of pension plan assets at December 31, 2015 and 2014 , by asset class are as follows: December 31, 2015 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 26,613 $ 26,613 $ — $ — 0 - 1% 5 % Equity securities 55 - 65% 63 % Common and preferred stock 267,037 267,037 — — Mutual funds 78,645 78,645 — — Fixed income 25 - 40% 26 % U.S. government and government agency securities 58,526 48,957 9,569 — Corporate bonds 70,809 — 70,809 — Mutual funds 17,351 17,351 — — Alternative investments 0 - 10% 6 % Mutual funds 31,044 31,044 — — Total pension assets $ 550,025 $ 469,647 $ 80,378 $ — 100 % December 31, 2014 Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 3,854 $ 3,854 — — 0 - 1% 1 % Equity securities 55 - 65% 62 % Common and preferred stock 284,656 284,656 — — Mutual funds 52,379 52,379 — — Fixed income 25 - 40% 28 % Mutual funds 153,928 — 153,928 — Alternative investments 0 - 10% 9 % Mutual funds 50,139 50,139 — — Total pension assets $ 544,956 $ 391,028 $ 153,928 $ — 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, 2015 and 2014 . (Dollars in thousands) 2015 2014 Change in benefit obligation Projected benefit obligation at January 1 $ 151,332 $ — Projected benefit obligation at October 1 acquisition date — 137,452 Service cost 3,341 832 Interest cost 6,393 1,488 Actuarial (gain) loss (10,937 ) 12,802 Benefits paid (4,812 ) (1,242 ) Curtailments (2,076 ) — Projected benefit obligation at December 31 143,241 151,332 Change in plan assets Fair value of plan assets at January 1 155,618 — Fair value of plan assets at October 1 acquisition date — 150,374 Actual return on plan assets 87 6,486 Benefits paid (4,812 ) (1,242 ) Fair value of plan assets at December 31 150,893 155,618 Funded status at December 31 $ 7,652 $ 4,286
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets at December 31, 2015 and 2014 consist of: (Dollars in thousands) 2015 2014 Other assets $ — $ — Other liabilities 7,652 4,286 Net asset (liability) recognized $ 7,652 $ 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, 2015 and 2014 . (Dollars in thousands) 2015 2014 Net loss $ 7,505 $ 9,123 Less prior service cost — — Accumulated other comprehensive loss, excluding income taxes $ 7,505 $ 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 years ended December 31, 2015 and 2014 . For 2014, the table only includes amounts after the October 1 acquisition of Bancorporation. Year ended December 31 (Dollars in thousands) 2015 2014 Service cost $ 3,341 $ 832 Interest cost 6,393 1,488 Expected return on assets (11,482 ) (2,807 ) Total net periodic benefit cost (1,748 ) (487 ) Current year actuarial loss 458 9,123 Curtailments (2,076 ) — Total recognized in other comprehensive income (1,618 ) 9,123 Total recognized in net periodic benefit cost and other comprehensive income $ (3,366 ) $ 8,636
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations at December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.68 % 4.27 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2015 and 2014 are as follows: (Dollars in thousands) 2015 2014 Discount rate 4.27 % 4.35 % Rate of compensation increase 4.00 4.00 Expected long-term return on plan assets 7.50 7.50
Schedule of Fair Value and Allocation of Plan Assets	December 31, 2015 (Dollars in thousands) Market Value Quoted prices in Significant Significant Actual % Cash and equivalents $ 13,437 $ 13,437 — — 9 % Equity securities 63 % Common and preferred stock 80,676 80,676 — — Mutual funds 15,005 15,005 — — Fixed income 22 % U.S. government and government agency securities 20,476 3,986 16,490 — Corporate bonds 8,011 — 8,011 — Mutual funds 4,198 4,198 — — Alternative investments 6 % Mutual funds 9,090 9,090 — — Total pension assets $ 150,893 $ 126,392 $ 24,501 — December 31, 2014 Market Value Quoted prices in Significant Significant Actual % Cash and equivalents $ 13,077 $ 13,077 — — 8 % Equity securities 69 % Common and preferred stock 101,540 101,540 — — Mutual funds 5,793 5,793 — — Fixed income 23 % U.S. government and government agency securities 23,528 23,528 — — Corporate bonds 11,680 — 11,680 — Total pension assets $ 155,618 $ 143,938 $ 11,680 —

Other Noninterest Income and 47

Other Noninterest Income and Other Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2015
Noninterest Expense [Abstract]
Schedule of Other Operating Cost and Expense, by Component	(Dollars in thousands) 2015 2014 2013 Cardholder processing $ 21,735 $ 15,133 $ 13,780 Merchant processing 58,231 42,661 35,279 Collection 9,649 11,595 21,209 Processing fees paid to third parties 18,779 17,089 15,095 Cardholder reward programs 11,069 8,252 6,266 Telecommunications 14,406 10,834 10,033 Consultant 8,925 10,168 9,740 Core deposit intangible amortization 18,892 6,955 2,308 Advertising 12,431 11,461 8,286 Other 95,741 76,481 71,018 Total other noninterest expense $ 269,858 $ 210,629 $ 193,014

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 2013 Current tax expense Federal $ 105,367 $ 84,430 $ 46,848 State 16,111 13,941 7,080 Total current tax expense 121,478 98,371 53,928 Deferred tax (benefit) expense Federal (2,758 ) (30,658 ) 38,731 State 3,308 (2,681 ) 8,915 Total deferred tax (benefit) expense 550 (33,339 ) 47,646 Total income tax expense $ 122,028 $ 65,032 $ 101,574
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) 2015 2014 2013 Income taxes at statutory rates $ 116,345 $ 71,258 $ 93,956 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (3,020 ) (1,832 ) (1,185 ) State and local income taxes, including change in valuation allowance, net of federal income tax benefit 12,622 7,319 10,397 Acquisition stock settlement — (10,185 ) — Tax credits net of amortization (3,060 ) (2,896 ) (960 ) Other, net (859 ) 1,368 (634 ) Total income tax expense $ 122,028 $ 65,032 $ 101,574
Schedule of Deferred Tax Assets and Liabilities	The net deferred tax asset included the following components at December 31 : (Dollars in thousands) 2015 2014 Allowance for loan and lease losses $ 78,878 $ 79,537 Pension liability 7,206 17,147 Executive separation from service agreements 9,856 13,753 State operating loss carryforward 21 29 Unrealized loss on cash flow hedge 537 1,673 Net unrealized loss on securities included in accumulated other comprehensive loss 9,379 — Accelerated depreciation 13,195 3,495 FDIC assisted transactions timing differences 66,456 77,388 Other reserves 10,772 12,770 Other 29,279 26,788 Deferred tax asset 225,579 232,580 Lease financing activities 15,492 12,706 Net unrealized gain on securities included in accumulated other comprehensive loss — 3,245 Net deferred loan fees and costs 6,051 4,532 Intangible assets 2,040 7,789 Security, loan and debt valuations 31,486 40,910 Other 12,026 13,287 Deferred tax liability 67,095 82,469 Net deferred tax asset $ 158,484 $ 150,111

Transactions with Related Per49

Transactions with Related Persons (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	For those identified as Related Persons as of December 31, 2015 , the following table provides an analysis of changes in the loans outstanding during 2015 and 2014 : Year ended December 31 (dollars in thousands) 2015 2014 Balance at January 1 $ 1,045 1,825 New loans 5 39 Repayments (971 ) (819 ) Balance at December 31 $ 79 1,045

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative [Line Items]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive (loss) income included the following at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive income (loss) Deferred tax expense (benefit) Accumulated other comprehensive income (loss), net of tax Unrealized (losses) gains on investment securities available for sale $ (24,504 ) $ (9,379 ) $ (15,125 ) $ 8,343 $ 3,245 $ 5,098 Unrealized loss on cash flow hedge (1,429 ) (537 ) (892 ) (4,337 ) (1,673 ) (2,664 ) Funded status of defined benefit plan (78,419 ) (29,996 ) (48,423 ) (90,696 ) (35,281 ) (55,415 ) Total $ (104,352 ) $ (39,912 ) $ (64,440 ) $ (86,690 ) $ (33,709 ) $ (52,981 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2015 and 2014 : (Dollars in thousands) Unrealized gains (losses) on available-for-sale securities (1) Gains (losses) on cash flow hedges (1) Defined benefit pension items (1) Total Balance at January 1, 2014 $ (10,091 ) $ (4,434 ) $ (10,743 ) $ (25,268 ) Other comprehensive income (loss) before reclassifications 33,061 1,770 (47,946 ) (13,115 ) Amounts reclassified from accumulated other comprehensive (loss) income (17,872 ) — 3,274 (14,598 ) 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 ) Other comprehensive income (loss) before reclassifications (13,544 ) 1,772 394 (11,378 ) Amounts reclassified from accumulated other comprehensive (loss) income (6,679 ) — 6,598 (81 ) Net current period other comprehensive (loss) income (20,223 ) 1,772 6,992 (11,459 ) Balance at December 31, 2015 $ (15,125 ) $ (892 ) $ (48,423 ) $ (64,440 ) (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, 2015 and 2014 . December 31, 2015 December 31, 2014 (Dollars in thousands) Notional amount Estimated fair value of liability Notional amount Estimated fair value of liability 2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016 $ 93,500 $ 1,429 $ 93,500 $ 4,337

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill [Line Items]
Changes in Goodwill	The following table presents the changes in the carrying amount of goodwill. (Dollars in thousands) 2015 2014 Balance at January 1 $ 139,773 $ 102,625 Acquired in the 1st Financial merger — 32,915 Acquired in the Bancorporation merger — 4,233 Balance at December 31 $ 139,773 $ 139,773
Mortgage Servicing Rights Key Economic Assumptions Used to Value	Key economic assumptions used to value mortgage servicing rights as of December 31, 2015 and 2014 were as follows: 2015 2014 Discount rate - conventional fixed loans 9.31 % 7.20 % Discount rate - all loans excluding conventional fixed loans 10.31 % 9.20 % Weighted average constant prepayment rate 11.01 % 14.25 % Weighted average cost to service a loan $ 56.61 $ 56.02
Schedule of Mortgage Servicing Rights at Amortized Cost	The activity of the servicing asset for the years ended December 31, 2015 and 2014 is presented in the following table: (Dollars in thousands) 2015 2014 Balance at January 1 $ 16,688 $ 16 Servicing rights originated 5,910 727 Amortization (4,002 ) (919 ) Servicing rights acquired in the 1st Financial merger — 148 Servicing rights acquired in the Bancorporation merger — 17,566 Valuation allowance reversal (provision) 755 (850 ) Balance at December 31 $ 19,351 $ 16,688
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block]	The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2015 and 2014 : (Dollars in thousands) 2015 2014 Balance at January 1 $ 850 $ — Valuation allowance (reversal) provision (755 ) 850 Balance at December 31 $ 95 $ 850
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) 2015 2014 Balance at January 1 $ 89,922 $ 1,247 Acquired in CCBT merger 690 — Acquired in the 1st Financial merger — 3,780 Acquired in the Bancorporation merger — 91,850 Removal due to branch sale (85 ) — Amortization (18,892 ) (6,955 ) Balance at December 31 $ 71,635 $ 89,922 Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2015 and 2014 . During 2015, BancShares recognized $690 thousand in core deposit intangibles related to the CCBT merger. Core deposit intangibles of $85 thousand were written off in 2015 as it related to previously acquired deposits that were sold in connection with the sale of a branch in December 2015. During 2014, BancShares recognized $91.9 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 2 years to less than 9 years. The gross amount of other intangible assets and accumulated amortization as of December 31, 2015 and 2014 , are: (dollars in thousands) 2015 2014 Gross balance $ 115,201 $ 114,596 Accumulated amortization (43,566 ) (24,674 ) Carrying value $ 71,635 $ 89,922
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) 2016 $ 16,440 2017 14,075 2018 11,710 2019 9,457 2020 7,492

Shareholders' Equity, Dividen52

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	Following is an analysis of capital ratios for BancShares and FCB as of December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Amount (1) Ratio (1) Requirements to be well-capitalized (2) Amount Ratio Requirements to be well-capitalized BancShares Tier 1 risk-based capital $ 2,831,242 12.65 % 8.00 % $ 2,690,324 13.61 % 6.00 % Common equity Tier 1 (3) 2,799,163 12.51 6.50 N/A N/A N/A Total risk-based capital 3,140,212 14.03 10.00 2,904,123 14.69 10.00 Leverage capital 2,831,242 8.96 5.00 2,690,324 8.91 5.00 FCB Tier 1 risk-based capital 2,821,475 12.64 8.00 2,019,595 13.12 6.00 Common equity Tier 1 (3) 2,821,475 12.64 6.50 N/A N/A N/A Total risk-based capital 3,038,070 13.61 10.00 2,212,163 14.37 10.00 Leverage capital 2,821,475 8.95 5.00 2,019,595 9.30 5.00 FCB-SC (4) Tier 1 risk-based capital N/A N/A N/A 653,515 15.11 6.00 Total risk-based capital N/A N/A N/A 657,475 15.20 10.00 Leverage capital N/A N/A N/A 653,515 7.89 5.00

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive (loss) income included the following at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive income (loss) Deferred tax expense (benefit) Accumulated other comprehensive income (loss), net of tax Unrealized (losses) gains on investment securities available for sale $ (24,504 ) $ (9,379 ) $ (15,125 ) $ 8,343 $ 3,245 $ 5,098 Unrealized loss on cash flow hedge (1,429 ) (537 ) (892 ) (4,337 ) (1,673 ) (2,664 ) Funded status of defined benefit plan (78,419 ) (29,996 ) (48,423 ) (90,696 ) (35,281 ) (55,415 ) Total $ (104,352 ) $ (39,912 ) $ (64,440 ) $ (86,690 ) $ (33,709 ) $ (52,981 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2015 and 2014 : (Dollars in thousands) Unrealized gains (losses) on available-for-sale securities (1) Gains (losses) on cash flow hedges (1) Defined benefit pension items (1) Total Balance at January 1, 2014 $ (10,091 ) $ (4,434 ) $ (10,743 ) $ (25,268 ) Other comprehensive income (loss) before reclassifications 33,061 1,770 (47,946 ) (13,115 ) Amounts reclassified from accumulated other comprehensive (loss) income (17,872 ) — 3,274 (14,598 ) 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 ) Other comprehensive income (loss) before reclassifications (13,544 ) 1,772 394 (11,378 ) Amounts reclassified from accumulated other comprehensive (loss) income (6,679 ) — 6,598 (81 ) Net current period other comprehensive (loss) income (20,223 ) 1,772 6,992 (11,459 ) Balance at December 31, 2015 $ (15,125 ) $ (892 ) $ (48,423 ) $ (64,440 ) (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, 2015 Details about accumulated other comprehensive income (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 $ 10,817 Securities gains (4,138 ) Income taxes $ 6,679 Net income Amortization of defined benefit pension items Prior service costs $ (210 ) Employee benefits Actuarial losses (11,376 ) Employee benefits (11,586 ) Employee benefits 4,988 Income taxes $ (6,598 ) Net income Total reclassifications for the period $ 81 Year ended December 31, 2014 Details about accumulated other comprehensive income (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 ) Employee benefits 2,084 Income taxes $ (3,274 ) Net income Total reclassifications for the period $ 14,598 (1) Amounts in parentheses indicate debits to profit/loss.

Parent Company Financial Stat54

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Parent Company Condensed Balance Sheets (Dollars in thousands) December 31, 2015 December 31, 2014 Assets Cash $ 26,285 $ 24,026 Investment securities available for sale 21,137 110,644 Investment in banking subsidiaries 2,874,581 2,750,201 Investment in other subsidiaries 43,117 65,665 Due from subsidiaries — 295,994 Other assets 73,944 74,157 Total assets $ 3,039,064 $ 3,320,687 Liabilities and Shareholders' Equity Short-term borrowings $ — $ 485,207 Long-term obligations 133,775 136,717 Due to subsidiaries 29,682 — Other liabilities 3,498 11,169 Shareholders' equity 2,872,109 2,687,594 Total liabilities and shareholders' equity $ 3,039,064 $ 3,320,687
Condensed Income Statements	Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2015 2014 2013 Interest income $ 645 $ 1,784 $ 1,387 Interest expense 6,793 9,694 7,065 Net interest loss (6,148 ) (7,910 ) (5,678 ) Dividends from banking subsidiaries 75,006 82,419 131,006 Dividends from other subsidiaries 23,500 — — Other income 1,870 33,600 3,620 Other operating expense 2,634 6,534 2,344 Income before income tax benefit and equity in undistributed net income of subsidiaries 91,594 101,575 126,604 Income tax benefit (2,618 ) (2,590 ) (2,095 ) Income before equity in undistributed net income of subsidiaries 94,212 104,165 128,699 Equity in undistributed net income of subsidiaries 116,174 34,397 38,170 Net income $ 210,386 $ 138,562 $ 166,869
Condensed Statements of Cash Flows	Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2015 2014 2013 OPERATING ACTIVITIES Net income $ 210,386 $ 138,562 $ 166,869 Adjustments Undistributed net income of subsidiaries (116,174 ) (34,397 ) (38,170 ) Net amortization of premiums and discounts (2,712 ) 594 334 Securities gains (236 ) (29,126 ) — Gain on elimination of acquired debt — (1,988 ) — Gain on sale of other assets — — (1,331 ) Change in other assets (3,070 ) 93,385 (61,704 ) Change in other liabilities (1,157 ) 2,250 (2,096 ) Net cash provided by operating activities 87,037 169,280 63,902 INVESTING ACTIVITIES Net change in due from subsidiaries 295,994 (150,328 ) (67,154 ) Purchases of investment securities (7,818 ) (33,243 ) (126,197 ) Proceeds from sales, calls, and maturities of securities 100,586 114,208 135,000 Investment in subsidiaries — 1,579 1,489 Business acquisitions, net of cash acquired — (24,772 ) — Net cash provided (used) by investing activities 388,762 (92,556 ) (56,862 ) FINANCING ACTIVITIES Net change in due to subsidiaries 29,682 — — Net change in short-term borrowings (485,207 ) (1,211 ) 12,860 Retirement of long-term obligations — (52,372 ) — Stock issuance costs — (619 ) — Repurchase of common stock — — (321 ) Cash dividends paid (18,015 ) (11,543 ) (8,663 ) Net cash (used) provided by financing activities (473,540 ) (65,745 ) 3,876 Net change in cash 2,259 10,979 10,916 Cash balance at beginning of year 24,026 13,047 2,131 Cash balance at end of year $ 26,285 $ 24,026 $ 13,047

Accounting Policies and Basis55

Accounting Policies and Basis of Presentation Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015USD ($)votebranch	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Allowance for Loan and Lease Losses, Reserve Release due to Update of Factors	$ 4,800,000
Nonmarketable Securities and Federal Home Loan Bank Stock	$ 37,700,000	$ 52,800,000
Period fair values are subject to refinement	1 year
Number of branches | branch	559
Net deferred fees on non-PCI loans	$ 16,600,000	20,800,000
Baseline for measurement	500,000
Securities Sold under Agreements to Repurchase	622,182,000	324,426,000
Short-term borrowings	$ 594,733,000	$ 987,184,000
Class A Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	1
Class B Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	16
Premises | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of asset	7 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

Business Combinations Businss C

Business Combinations Businss Combinations (Details) - USD ($)	Feb. 14, 2015	Oct. 02, 2014	Jan. 02, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 13, 2015	Oct. 01, 2014
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value				$ 154,496,000	$ 623,408,000		$ 154,496,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value								$ 4,175,586,000
FDIC Indemnification Asset, Acquisitions				0	5,106,000	$ 0
Gain on acquisition				42,930,000	0	0
Merger-related expenses				14,174,000	13,064,000	$ 391,000
Capitol City Bank and Trust
Business Acquisition [Line Items]
Cash and due from banks							19,622,000
Investment securities							35,413,000
Other intangible assets							690,000
Other assets							1,714,000
Total assets acquired							211,935,000
Deposits							266,352,000
Business Combination Bargain Purchase Gain Adjustment				5,400,000
Gain on acquisition	$ 42,930,000
Bargain Purchase After Tax Gain	$ 26,400,000
Short-term borrowings							5,501,000
Other liabilities							667,000
Total liabilities assumed							272,520,000
Fair value of net assets (liabilities) acquired							(60,585,000)
Business Combination Cash Received From FDIC In Acquisition							$ 103,515,000
Revenue of acquired business				8,300,000
Merger-related expenses				1,900,000
Bancorporation
Business Acquisition [Line Items]
BancShares number of shares owned in Bancorporation		32,042
Gain on Bancorporation stock		$ 29,100,000
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				12,300,000	8,000,000
Pro forma revenue				1,336,340,000
Pro forma net income				(13,171,000)
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
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			307,927,000
Other intangible assets			3,780,000
Total assets acquired			612,921,000
Deposits			631,871,000
Total liabilities assumed			635,836,000
Goodwill acquired			$ 32,915,000	0	$ 32,915,000
Revenue of acquired business				15,200,000
Merger-related expenses				$ 5,000,000
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 | 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 ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	$ 280,126	$ 832,420
Investment securities available for sale
Cost	6,885,797	7,163,574
Gross Unrealized Gains	6,367	20,589
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	30,871	12,246
Fair Value	6,861,293	7,171,917
Investment securities held to maturity
Cost	255	518
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,094	10,043
U. S. Treasury
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	0	1,015
Investment securities available for sale
Cost	1,675,996	2,626,900
Gross Unrealized Gains	4	2,922
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	1,118	152
Fair Value	1,674,882	2,629,670
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	1
Government Agency
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	0	0
Investment securities available for sale
Cost	498,804	908,362
Gross Unrealized Gains	230	702
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	374	247
Fair Value	498,660	908,817
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Mortgage Backed Securities, Other
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	280,126	831,405
Investment securities available for sale
Cost	4,692,447	3,628,187
Gross Unrealized Gains	5,120	16,964
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	29,369	11,847
Fair Value	4,668,198	3,633,304
Investment securities held to maturity
Cost	255	518
Held To Maturity Securities Accumulated Unrecognized Holding Gain	10	26
Held To Maturity Securities Accumulated Unrecognized Holding Loss	0	0
Fair Value	265	544
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,094	10,042
Equity Securities
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	0
Investment securities available for sale
Cost	7,935
Gross Unrealized Gains	968
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	10
Fair Value	8,893
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
State, County and Municipal
Investment securities available for sale
Cost		125
Gross Unrealized Gains		1
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		0
Fair Value		$ 126
Other Debt Obligations
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	0
Investment securities available for sale
Cost	10,615
Gross Unrealized Gains	45
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0
Fair Value	10,660
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0

Investments (Maturity Informati

Investments (Maturity Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment securities available for sale
Total investment securities available for sale, cost	$ 6,885,797	$ 7,163,574
Investment securities available for sale	6,861,293	7,171,917
Investment securities held to maturity
Investment securities held to maturity	255	518
Debt Securities
Investment securities available for sale
Maturing in one year or less, cost	1,255,714	447,866
Maturing in one through five years, cost	919,086	3,087,521
Maturing in five through ten years, cost	8,500	0
Maturing in over ten years, cost	2,115	0
Maturing in one year or less, fair value	1,255,094	447,992
Maturing in one through five years, fair value	918,448	3,090,621
Maturing in five through ten years, fair value	8,500	0
Maturing in over ten years, fair value	2,160	0
Equity Securities
Investment securities available for sale
Total investment securities available for sale, cost	7,935	0
Investment securities available for sale	8,893	0
Mortgage Backed Securities, Other
Investment securities available for sale
Total investment securities available for sale, cost	4,692,447	3,628,187
Investment securities available for sale	4,668,198	3,633,304
Investment securities held to maturity
Investment securities held to maturity	255	518
Fair Value	$ 265	$ 544

Investments (Securities Gains (

Investments (Securities Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Gross gains on sales of investment securities available for sale	$ 10,834	$ 29,129	$ 0
Gross losses on sales of investment securities available for sale	(17)	(33)	0
Total securities gains (losses)	$ 10,817	$ 29,096	$ 0

Investments (Unrealized Losses)

Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment securities available for sale:
Less than 12 months, fair value	$ 5,340,271	$ 1,173,274
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	24,777	2,203
Aggregate fair value, continuous unrealized loss position, 12 months or more	280,126	832,420
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,094	10,043
Total fair value	5,620,397	2,005,694
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	30,871	12,246
U. S. Treasury
Investment securities available for sale:
Less than 12 months, fair value	1,539,637	338,612
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	1,118	151
Aggregate fair value, continuous unrealized loss position, 12 months or more	0	1,015
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	1
Total fair value	1,539,637	339,627
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	1,118	152
Government Agency
Investment securities available for sale:
Less than 12 months, fair value	229,436	261,288
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	374	247
Aggregate fair value, continuous unrealized loss position, 12 months or more	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	229,436	261,288
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	374	247
Mortgage Backed Securities, Other
Investment securities available for sale:
Less than 12 months, fair value	3,570,470	573,374
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	23,275	1,805
Aggregate fair value, continuous unrealized loss position, 12 months or more	280,126	831,405
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,094	10,042
Total fair value	3,850,596	1,404,779
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	29,369	11,847
Equity Securities
Investment securities available for sale:
Less than 12 months, fair value	728
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	10
Aggregate fair value, continuous unrealized loss position, 12 months or more	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Total fair value	728
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	10
Other Debt Obligations
Investment securities available for sale:
Less than 12 months, fair value	0
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	0
Aggregate fair value, continuous unrealized loss position, 12 months or more	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Total fair value	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 0
State, County and Municipal
Investment securities available for sale:
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		$ 0

Investments (Narrative) (Detail

Investments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015USD ($)investments	Dec. 31, 2014USD ($)
Investments [Abstract]
Available-for-sale Securities, Aggregate fair value, continuous unrealized loss position, 12 months or more	$ 280,126,000	$ 832,420,000
Number of investments in continuous unrealized loss position for more than twelve months | investments	39
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	$ 4,730,000,000	$ 4,370,000,000

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining	$ 41,100	$ 61,200
Loans and Leases Receivable, Collateral for Secured Borrowings	6,080,000	2,200,000
Advances from Federal Home Loan Banks	510,300	240,300
Federal Home Loan Bank Advances, Current Borrowing Capacity	5,570,000	1,960,000
Sale of Loans Held-for-investment	45,900
Noncovered loans pledged to secure debt obligations	$ 8,580,000	3,160,000
Charge off of past due business credit card loans (days)	120 days
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 272,600	485,300
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Accretion Income	18,700	5,900
United Western Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	119,600
First Regional Bank
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	9,700
Colorado Capital Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	4,800
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccruing	7,579	33,422
Loans on the Cost Recovery Method | PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired impaired loans	5,300	$ 33,400
Williamsburg First National Bank
Financing Receivable, Recorded Investment [Line Items]
Loans, not covered by FDIC loss share agreements	6,800
Sun American Bank
Financing Receivable, Recorded Investment [Line Items]
Loans, not covered by FDIC loss share agreements	$ 26,700

Loans and Leases (Loans and Lea

Loans and Leases (Loans and Leases Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 272,600	$ 485,300
PCI Loans	950,516	1,186,498	$ 1,029,426
Non-PCI	19,289,474	17,582,967
Total loans and leases	20,239,990	18,769,465
Commercial
PCI Loans	593,614	726,123
Non-PCI	12,630,489	11,205,639
Commercial | Construction and land development
PCI Loans	33,880	78,079
Non-PCI	620,352	493,133
Commercial | Mortgage
PCI Loans	525,468	577,518
Non-PCI	8,274,548	7,552,948
Commercial | Commercial and industrial
PCI Loans	15,182	27,254
Non-PCI	2,368,958	1,988,934
Commercial | Lease financing
Non-PCI	730,778	571,916
Commercial | Other commercial real estate
PCI Loans	17,076	40,193
Non-PCI	321,021	244,875
Commercial | Other
PCI Loans	2,008	3,079
Non-PCI	314,832	353,833
Noncommercial
PCI Loans	356,902	460,375
Non-PCI	6,658,985	6,377,328
Noncommercial | Construction and land development
PCI Loans	0	912
Non-PCI	220,073	205,016
Noncommercial | Mortgage
PCI Loans	302,158	382,340
Non-PCI	2,695,985	2,493,058
Noncommercial | Revolving mortgage
PCI Loans	52,471	74,109
Non-PCI	2,523,106	2,561,800
Noncommercial | Consumer
PCI Loans	2,273	3,014
Non-PCI	$ 1,219,821	$ 1,117,454

Loans and Leases (Loans Acquire

Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 950,516	$ 1,186,498	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	593,614	726,123
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	33,880	78,079
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	525,468	577,518
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	17,076	40,193
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	15,182	27,254
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	2,008	3,079
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	356,902	460,375
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	912
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	302,158	382,340
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	52,471	74,109
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 2,273	$ 3,014

Loans and Leases (Composition o

Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	$ 19,289,474	$ 17,582,967
PCI Loans	950,516	1,186,498	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	12,630,489	11,205,639
PCI Loans	593,614	726,123
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	620,352	493,133
PCI Loans	33,880	78,079
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	8,274,548	7,552,948
PCI Loans	525,468	577,518
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	321,021	244,875
PCI Loans	17,076	40,193
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,368,958	1,988,934
PCI Loans	15,182	27,254
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	730,778	571,916
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	314,832	353,833
PCI Loans	2,008	3,079
Commercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	2,008	3,079
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	12,204,677	10,773,986
PCI Loans	294,663	342,172
Commercial | Pass | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	611,314	474,374
PCI Loans	14,710	13,514
Commercial | Pass | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	8,024,831	7,284,714
PCI Loans	262,579	300,187
Commercial | Pass | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	318,187	242,053
PCI Loans	7,366	11,033
Commercial | Pass | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,219,606	1,859,415
PCI Loans	9,302	16,637
Commercial | Pass | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	719,338	564,319
Commercial | Pass | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	311,401	349,111
Commercial | Pass | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	706	801
Commercial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	132,021	176,355
PCI Loans	89,625	125,195
Commercial | Special Mention | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	5,191	13,927
PCI Loans	758	6,063
Commercial | Special Mention | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	100,220	129,247
PCI Loans	87,870	98,724
Commercial | Special Mention | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	475	909
PCI Loans	60	16,271
Commercial | Special Mention | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	19,361	27,683
PCI Loans	937	4,137
Commercial | Special Mention | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	4,869	3,205
Commercial | Special Mention | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,905	1,384
Commercial | Special Mention | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	0
Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	180,100	157,333
PCI Loans	193,051	247,138
Commercial | Substandard | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	3,847	4,720
PCI Loans	14,131	53,739
Commercial | Substandard | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	146,071	134,677
PCI Loans	163,801	171,920
Commercial | Substandard | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	959	1,765
PCI Loans	9,229	12,889
Commercial | Substandard | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	21,322	8,878
PCI Loans	4,588	6,312
Commercial | Substandard | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	6,375	3,955
Commercial | Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,526	3,338
Commercial | Substandard | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	1,302	2,278
Commercial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,176	2,895
PCI Loans	15,438	9,241
Commercial | Doubtful | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
PCI Loans	4,281	2,809
Commercial | Doubtful | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	599	2,366
PCI Loans	10,875	6,302
Commercial | Doubtful | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
PCI Loans	0	0
Commercial | Doubtful | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	408	164
PCI Loans	282	130
Commercial | Doubtful | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	169	365
Commercial | Doubtful | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
Commercial | Doubtful | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	0
Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	112,515	95,070
PCI Loans	837	2,377
Commercial | Ungraded | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	112
PCI Loans	0	1,954
Commercial | Ungraded | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,827	1,944
PCI Loans	343	385
Commercial | Ungraded | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,400	148
PCI Loans	421	0
Commercial | Ungraded | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	108,261	92,794
PCI Loans	73	38
Commercial | Ungraded | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	27	72
Commercial | Ungraded | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
Commercial | Ungraded | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	0
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	6,658,985	6,377,328
PCI Loans	356,902	460,375
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	220,073	205,016
PCI Loans	0	912
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,695,985	2,493,058
PCI Loans	302,158	382,340
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,523,106	2,561,800
PCI Loans	52,471	74,109
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,219,821	1,117,454
PCI Loans	2,273	3,014
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	19,289,474	17,582,967
Current	19,167,898	17,481,500
Past Due	121,576	101,467
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	620,352	493,133
Current	618,619	492,000
Past Due	1,733	1,133
Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	8,274,548	7,552,948
Current	8,243,584	7,528,738
Past Due	30,964	24,210
Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	321,021	244,875
Current	319,995	244,497
Past Due	1,026	378
Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,368,958	1,988,934
Current	2,363,966	1,984,168
Past Due	4,992	4,766
Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	730,778	571,916
Current	728,542	570,275
Past Due	2,236	1,641
Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	314,832	353,833
Current	314,531	351,721
Past Due	301	2,112
Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	6,658,985	6,377,328
Current	6,578,661	6,310,101
Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	220,073	205,016
Current	214,555	202,344
Past Due	5,518	2,672
Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,695,985	2,493,058
Current	2,651,209	2,454,797
Past Due	44,776	38,261
Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,523,106	2,561,800
Current	2,502,065	2,542,807
Past Due	21,041	18,993
Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,219,821	1,117,454
Current	1,210,832	1,110,153
Past Due	8,989	7,301
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans		1,186,498
PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	33,880	78,079
PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	525,468	577,518
PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	17,076	40,193
PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	15,182	27,254
PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	307,089	398,225
PCI Loans	356,902	460,375
PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0	506
PCI Loans	0	912
PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	257,207	326,589
PCI Loans	302,158	382,340
PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	47,901	68,548
PCI Loans	52,471	74,109
PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,981	2,582
PCI Loans	2,273	3,014
PCI Loans | Noncommercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	4,281	6,093
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	63,522	57,321
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	987	520
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,023	11,367
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	884	206
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,133	2,843
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,070	1,631
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3	146
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	44,422	40,608
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,211	1,646
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	23,960	23,288
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	11,706	11,097
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,545	4,577
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,531	12,984
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	12,318	11,432
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,127	1,405
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	86	147
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	18,705	19,548
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	283	283
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,446	4,782
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	70
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,079	1,545
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2	8
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	164	1,966
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,731	10,894
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	669	824
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,536	6,018
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,704	2,433
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,822	1,619
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,074	10,443
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,441	10,073
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	501	345
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	132	25
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	39,349	24,598
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	463	330
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	14,495	8,061
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	142	102
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,780	378
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	164	2
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	134	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	22,171	15,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,638	202
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,280	8,955
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,631	5,463
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,622	1,105
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	31,208	38,723
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	406
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	28,192	34,246
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,942	3,811
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 74	$ 260

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 ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	$ 19,289,474	$ 17,582,967
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	12,630,489	11,205,639
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	620,352	493,133
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	8,274,548	7,552,948
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	321,021	244,875
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,368,958	1,988,934
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	730,778	571,916
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	314,832	353,833
Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	6,658,985	6,377,328
Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	220,073	205,016
Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,695,985	2,493,058
Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,523,106	2,561,800
Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	1,219,821	1,117,454
Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	121,576	101,467
Current	19,167,898	17,481,500
Non-PCI Loans	19,289,474	17,582,967
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,733	1,133
Current	618,619	492,000
Non-PCI Loans	620,352	493,133
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	30,964	24,210
Current	8,243,584	7,528,738
Non-PCI Loans	8,274,548	7,552,948
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,026	378
Current	319,995	244,497
Non-PCI Loans	321,021	244,875
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,992	4,766
Current	2,363,966	1,984,168
Non-PCI Loans	2,368,958	1,988,934
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,236	1,641
Current	728,542	570,275
Non-PCI Loans	730,778	571,916
Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	301	2,112
Current	314,531	351,721
Non-PCI Loans	314,832	353,833
Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	6,578,661	6,310,101
Non-PCI Loans	6,658,985	6,377,328
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,518	2,672
Current	214,555	202,344
Non-PCI Loans	220,073	205,016
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	44,776	38,261
Current	2,651,209	2,454,797
Non-PCI Loans	2,695,985	2,493,058
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	21,041	18,993
Current	2,502,065	2,542,807
Non-PCI Loans	2,523,106	2,561,800
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	8,989	7,301
Current	1,210,832	1,110,153
Non-PCI Loans	1,219,821	1,117,454
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	63,522	57,321
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	987	520
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	13,023	11,367
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	884	206
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,133	2,843
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,070	1,631
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3	146
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	44,422	40,608
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,211	1,646
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	23,960	23,288
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,706	11,097
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,545	4,577
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	18,705	19,548
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	283	283
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,446	4,782
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	70
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,079	1,545
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2	8
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	164	1,966
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	13,731	10,894
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	669	824
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	7,536	6,018
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,704	2,433
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,822	1,619
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	39,349	24,598
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	463	330
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	14,495	8,061
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	142	102
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,780	378
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	164	2
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	134	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	22,171	15,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,638	202
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	13,280	8,955
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,631	5,463
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 1,622	$ 1,105

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) - Non-PCI Loans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 95,854	$ 44,005
Loans and leases greater than 90 days and accruing	3,315	11,250
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	425	343
Loans and leases greater than 90 days and accruing	273	56
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	42,116	24,720
Loans and leases greater than 90 days and accruing	242	1,003
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	6,235	1,741
Loans and leases greater than 90 days and accruing	953	239
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	239	619
Loans and leases greater than 90 days and accruing	0	35
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	389	374
Loans and leases greater than 90 days and accruing	0	2
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,164	0
Loans and leases greater than 90 days and accruing	0	202
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	29,977	14,242
Loans and leases greater than 90 days and accruing	838	3,191
Noncommercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	133	1,966
Loans and leases greater than 90 days and accruing	2	0
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	12,704	0
Loans and leases greater than 90 days and accruing	0	5,463
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,472	0
Loans and leases greater than 90 days and accruing	$ 1,007	$ 1,059

Loans and Leases (Changes In Ca

Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Feb. 13, 2015	Dec. 31, 2013
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	$ 247,812	$ 828,156
Carrying Value of Acquired Impaired Loans [Roll Forward]
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(505,058)	(578,704)
Outstanding principal balance	1,693,372	2,057,691
PCI Loans	950,516	1,186,498		$ 1,029,426
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	207,688	735,381
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	154,496	623,408	$ 154,496
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	114,580	112,368
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	593,614	726,123
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	139,894	301,857
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	356,902	460,375
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	14,602	321,551
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	33,880	78,079
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	4,116	69,789
Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	0	912
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	0	199
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	525,468	577,518
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	129,732	176,841
Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	302,158	382,340
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	13,251	287,675
Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	52,471	74,109
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	0	29,777
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	17,076	40,193
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	3,202	15,425
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	15,182	27,254
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	2,844	37,583
Other | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	2,008	3,079
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	0	2,219
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	2,273	3,014
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,351	3,900
PCI Loans
Loans and Leases Receivable Disclosure [Abstract]
Nonaccruing	7,579	33,422
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans		1,186,498
PCI Loans | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	356,902	460,375
PCI Loans | Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	33,880	78,079
PCI Loans | Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	0	912
PCI Loans | Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	525,468	577,518
PCI Loans | Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	302,158	382,340
PCI Loans | Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	52,471	74,109
PCI Loans | Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	17,076	40,193
PCI Loans | Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	15,182	27,254
PCI Loans | Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	$ 2,273	$ 3,014

Loans and Leases (Changes In 69

Loans and Leases (Changes In Carrying Amount Of Accretable Yield) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 01, 2014	Dec. 31, 2013
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	$ 343,856	$ 418,160		$ 439,990
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions	53,192	111,973
Accretion	(114,580)	(112,368)
Reclassifications from nonaccretable difference	25,357	7,865
Changes in expected cash flows that do not affect nonaccretable difference	$ (38,273)	$ (29,300)

Loans and Leases Loans and Leas

Loans and Leases Loans and Leases (Recorded Fair Values of Purchased Non-Impaired Loans and Leases) (Details) $ in Thousands	Oct. 01, 2014USD ($)
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 | 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 | 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 | 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 | 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 71

Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 204,466	$ 233,394	$ 319,018
Reclassification		0	0	7,368	[1]
Provisions		20,664	640	(32,255)
Charge-offs		(28,348)	(37,770)	(68,026)
Recoveries		9,434	8,202	7,289
Net charge-offs		(18,914)	(29,568)	(60,737)
Ending balance		206,216	204,466	233,394
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		204,466	233,394	319,018		$ 206,216	$ 204,466	$ 233,394
Loans and Leases Evaluated for Impairment [Abstract]
Net Loans and Leases						20,033,774	18,564,999
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality						206,216	204,466
PCI Loans						950,516	1,186,498	1,029,426
Commercial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						593,614	726,123
Commercial | Construction and land development
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						33,880	78,079
Commercial | Mortgage
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						525,468	577,518
Commercial | Other commercial real estate
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						17,076	40,193
Commercial | Commercial and industrial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						15,182	27,254
Commercial | Other
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						2,008	3,079
Commercial | Consumer and Other
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						2,008	3,079
Noncommercial
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification		7,368
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						356,902	460,375
Noncommercial | Construction and land development
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						0	912
Noncommercial | Mortgage
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						302,158	382,340
Noncommercial | Revolving mortgage
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						52,471	74,109
Noncommercial | Consumer
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						2,273	3,014
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		182,837	179,874	179,046
Reclassification	[1]			7,368
Provisions		22,937	15,260	19,289
Charge-offs		(25,304)	(20,499)	(33,118)
Recoveries		9,434	8,202	7,289
Net charge-offs		(15,870)	(12,297)	(25,829)
Ending balance		189,904	182,837	179,874
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						7,200	15,717
ALLL for loans and leases collectively evaluated for impairment						182,704	167,120
Total allowance for loan and lease losses		182,837	179,874	179,046		189,904	182,837	179,874
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						150,367	119,593
Loans and leases collectively evaluated for impairment						19,139,107	17,463,074
Net Loans and Leases						19,289,474	17,582,667
Non-PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		11,961	10,335	6,031
Reclassification	[1]			5,141
Provisions		4,773	1,735	2,809
Charge-offs		(1,012)	(316)	(4,685)
Recoveries		566	207	1,039
Ending balance		16,288	11,961	10,335
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						123	92
ALLL for loans and leases collectively evaluated for impairment						16,165	11,869
Total allowance for loan and lease losses		11,961	10,335	6,031		16,288	11,961	10,335
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						3,094	1,620
Loans and leases collectively evaluated for impairment						617,258	491,513
Net Loans and Leases						620,352	493,133
Non-PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		85,189	100,257	80,229
Reclassification	[1]			27,421
Provisions		(15,822)	(16,746)	(4,485)
Charge-offs		(1,498)	(1,147)	(3,904)
Recoveries		2,027	2,825	996
Ending balance		69,896	85,189	100,257
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						3,370	8,610
ALLL for loans and leases collectively evaluated for impairment						66,526	76,579
Total allowance for loan and lease losses		85,189	100,257	80,229		69,896	85,189	100,257
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						95,107	82,803
Loans and leases collectively evaluated for impairment						8,179,441	7,470,145
Net Loans and Leases						8,274,548	7,552,948
Non-PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		732	1,009	2,059
Reclassification	[1]			(815)
Provisions		1,569	(401)	(32)
Charge-offs		(178)	0	(312)
Recoveries		45	124	109
Ending balance		2,168	732	1,009
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						289	112
ALLL for loans and leases collectively evaluated for impairment						1,879	620
Total allowance for loan and lease losses		732	1,009	2,059		2,168	732	1,009
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						427	584
Loans and leases collectively evaluated for impairment						320,594	244,291
Net Loans and Leases						321,021	244,875
Non-PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		30,727	22,362	14,050
Reclassification	[1]			7,551
Provisions		17,432	10,441	4,333
Charge-offs		(5,952)	(3,014)	(4,785)
Recoveries		909	938	1,213
Ending balance		43,116	30,727	22,362
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						1,118	1,743
ALLL for loans and leases collectively evaluated for impairment						41,998	28,984
Total allowance for loan and lease losses		30,727	22,362	14,050		43,116	30,727	22,362
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						17,910	11,040
Loans and leases collectively evaluated for impairment						2,351,048	1,977,594
Net Loans and Leases						2,368,958	1,988,634
Non-PCI Loans | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		4,286	4,749	3,521
Reclassification	[1]			(253)
Provisions		1,602	(473)	1,646
Charge-offs		(402)	(100)	(272)
Recoveries		38	110	107
Ending balance		5,524	4,286	4,749
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						213	150
ALLL for loans and leases collectively evaluated for impairment						5,311	4,136
Total allowance for loan and lease losses		4,286	4,749	3,521		5,524	4,286	4,749
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						1,755	623
Loans and leases collectively evaluated for impairment						729,023	571,293
Net Loans and Leases						730,778	571,916
Non-PCI Loans | Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		3,184	190	1,175
Reclassification	[1]			(1,288)
Provisions		(1,420)	3,007	308
Charge-offs		0	(13)	(6)
Recoveries		91	0	1
Ending balance		1,855	3,184	190
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						0	1,972
ALLL for loans and leases collectively evaluated for impairment						1,855	1,212
Total allowance for loan and lease losses		3,184	190	1,175		1,855	3,184	190
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						1,183	2,000
Loans and leases collectively evaluated for impairment						313,649	351,833
Net Loans and Leases						314,832	353,833
Non-PCI Loans | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		892	681	1,721
Reclassification	[1]			(478)
Provisions		541	245	(379)
Charge-offs		(22)	(118)	(392)
Recoveries		74	84	209
Ending balance		1,485	892	681
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						49	71
ALLL for loans and leases collectively evaluated for impairment						1,436	821
Total allowance for loan and lease losses		892	681	1,721		1,485	892	681
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						784	1,340
Loans and leases collectively evaluated for impairment						219,289	203,676
Net Loans and Leases						220,073	205,016
Non-PCI Loans | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		10,661	10,511	3,836
Reclassification	[1]			5,717
Provisions		4,202	1,219	2,786
Charge-offs		(1,619)	(1,260)	(2,387)
Recoveries		861	191	559
Ending balance		14,105	10,661	10,511
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						1,212	1,360
ALLL for loans and leases collectively evaluated for impairment						12,893	9,301
Total allowance for loan and lease losses		10,661	10,511	3,836		14,105	10,661	10,511
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						22,986	14,913
Loans and leases collectively evaluated for impairment						2,672,999	2,478,145
Net Loans and Leases						2,695,985	2,493,058
Non-PCI Loans | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		18,650	16,239	25,185
Reclassification	[1]			(9,838)
Provisions		(927)	6,301	6,296
Charge-offs		(2,925)	(4,744)	(6,064)
Recoveries		1,173	854	660
Ending balance		15,971	18,650	16,239
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						299	1,052
ALLL for loans and leases collectively evaluated for impairment						15,672	17,598
Total allowance for loan and lease losses		18,650	16,239	25,185		15,971	18,650	16,239
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						5,883	3,675
Loans and leases collectively evaluated for impairment						2,517,223	2,558,125
Net Loans and Leases						2,523,106	2,561,800
Non-PCI Loans | Noncommercial | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		16,555	13,541	25,389
Reclassification	[1]			(10,018)
Provisions		10,987	9,932	6,085
Charge-offs		(11,696)	(9,787)	(10,311)
Recoveries		3,650	2,869	2,396
Ending balance		19,496	16,555	13,541
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment						527	555
ALLL for loans and leases collectively evaluated for impairment						18,969	16,000
Total allowance for loan and lease losses		16,555	13,541	25,389		19,496	16,555	13,541
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment						1,238	995
Loans and leases collectively evaluated for impairment						1,218,583	1,116,459
Net Loans and Leases						1,219,821	1,117,454
Non-PCI Loans | Noncommercial | Non-specific
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		0	0	15,850
Reclassification	[1]			(15,772)
Provisions		0	0	(78)
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	15,850		0	0	0
PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		21,629	53,520	139,972
Reclassification	[1]			0
Provisions		(2,273)	(14,620)	(51,544)
Charge-offs		(3,044)	(17,271)	(34,908)
Recoveries		0	0	0
Net charge-offs		(3,044)	(17,271)	(34,908)
Ending balance		16,312	21,629	53,520
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		21,629	53,520	139,972		16,312	21,629	53,520
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans							1,186,498
PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		150	1,320	31,186
Provisions		1,029	1,284	(22,942)
Charge-offs		(97)	(2,454)	(6,924)
Recoveries		0	0	0
Ending balance		1,082	150	1,320
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		150	1,320	31,186		1,082	150	1,320
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						33,880	78,079
PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		10,135	29,906	50,275
Provisions		(1,426)	(7,903)	(3,872)
Charge-offs		(871)	(11,868)	(16,497)
Recoveries		0	0	0
Ending balance		7,838	10,135	29,906
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		10,135	29,906	50,275		7,838	10,135	29,906
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						525,468	577,518
PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		75	1,354	11,234
Provisions		698	(1,385)	(8,949)
Charge-offs		0	(106)	(931)
Recoveries		0	0
Ending balance		773	75	1,354
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		75	1,354	11,234		773	75	1,354
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						17,076	40,193
PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		1,240	5,275	8,897
Provisions		(470)	(2,023)	470
Charge-offs		(325)	(2,012)	(4,092)
Recoveries		0	0	0
Ending balance		445	1,240	5,275
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		1,240	5,275	8,897		445	1,240	5,275
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						15,182	27,254
PCI Loans | Noncommercial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						356,902	460,375
PCI Loans | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		183	682	8,287
Provisions		(183)	(395)	(4,170)
Charge-offs		0	(104)	(3,435)
Recoveries		0	0	0
Ending balance		0	183	682
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		183	682	8,287		0	183	682
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						0	912
PCI Loans | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		5,820	11,802	19,837
Provisions		72	(5,576)	(5,487)
Charge-offs		(494)	(406)	(2,548)
Recoveries		0	0	0
Ending balance		5,398	5,820	11,802
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		5,820	11,802	19,837		5,398	5,820	11,802
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						302,158	382,340
PCI Loans | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		3,999	2,959	9,754
Provisions		(2,720)	1,523	(6,399)
Charge-offs		(756)	(483)	(396)
Recoveries		0	0	0
Ending balance		523	3,999	2,959
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		3,999	2,959	9,754		523	3,999	2,959
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						52,471	74,109
PCI Loans | Noncommercial | Consumer
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						2,273	3,014
PCI Loans | Noncommercial | Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		27	222	502
Provisions		727	(145)	(195)
Charge-offs		(501)	(50)	(85)
Recoveries		0	0	0
Ending balance		253	27	222
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses		$ 27	$ 222	$ 502		253	27	$ 222
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans						$ 4,281	$ 6,093
[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 72

Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		$ 0	$ 0	$ 7,368	[1]
Unpaid principal balance		1,693,372	2,057,691
Allowance for loan and lease losses		206,216	204,466	233,394		$ 319,018
Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		7,368
Noncommercial | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification		(15,772)
Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			7,368
Unpaid principal balance		167,966	133,466
ALLL for loans and leases individually evaluated for impairment		7,200	15,717
Impaired Financing Receivable, with Related Allowance, Recorded Investment		66,861	87,007
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		83,506	32,586
Financing Receivable, Individually Evaluated for Impairment		150,367	119,593
Average balance		136,404	127,421	151,330
Interest income recognized		4,675	5,427	7,817
Allowance for loan and lease losses		189,904	182,837	179,874		179,046
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(815)
Unpaid principal balance		863	913
ALLL for loans and leases individually evaluated for impairment		289	112
Impaired Financing Receivable, with Related Allowance, Recorded Investment		305	112
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		122	472
Financing Receivable, Individually Evaluated for Impairment		427	584
Average balance		481	2,125	2,658
Interest income recognized		12	80	144
Allowance for loan and lease losses		2,168	732	1,009		2,059
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			5,141
Unpaid principal balance		4,428	6,945
ALLL for loans and leases individually evaluated for impairment		123	92
Impaired Financing Receivable, with Related Allowance, Recorded Investment		1,623	996
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		1,471	624
Financing Receivable, Individually Evaluated for Impairment		3,094	1,620
Average balance		3,164	1,689	6,414
Interest income recognized		146	83	270
Allowance for loan and lease losses		16,288	11,961	10,335		6,031
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			27,421
Unpaid principal balance		103,763	87,702
ALLL for loans and leases individually evaluated for impairment		3,370	8,610
Impaired Financing Receivable, with Related Allowance, Recorded Investment		41,793	57,324
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		53,314	25,479
Financing Receivable, Individually Evaluated for Impairment		95,107	82,803
Average balance		89,934	86,250	105,628
Interest income recognized		3,129	3,698	5,702
Allowance for loan and lease losses		69,896	85,189	100,257		80,229
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			7,551
Unpaid principal balance		21,455	12,197
ALLL for loans and leases individually evaluated for impairment		1,118	1,743
Impaired Financing Receivable, with Related Allowance, Recorded Investment		8,544	10,319
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		9,366	721
Financing Receivable, Individually Evaluated for Impairment		17,910	11,040
Average balance		14,587	13,433	12,772
Interest income recognized		510	580	642
Allowance for loan and lease losses		43,116	30,727	22,362		14,050
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(253)
Unpaid principal balance		1,956	623
ALLL for loans and leases individually evaluated for impairment		213	150
Impaired Financing Receivable, with Related Allowance, Recorded Investment		1,651	319
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		104	304
Financing Receivable, Individually Evaluated for Impairment		1,755	623
Average balance		1,718	774	350
Interest income recognized		74	44	22
Allowance for loan and lease losses		5,524	4,286	4,749		3,521
Non-PCI Loans | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(1,288)
Unpaid principal balance		1,260	2,000
ALLL for loans and leases individually evaluated for impairment		0	1,972
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0	2,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		1,183	0
Financing Receivable, Individually Evaluated for Impairment		1,183	2,000
Average balance		1,673	528	0
Interest income recognized		37	29	0
Allowance for loan and lease losses		1,855	3,184	190		1,175
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(478)
Unpaid principal balance		784	1,340
ALLL for loans and leases individually evaluated for impairment		49	71
Impaired Financing Receivable, with Related Allowance, Recorded Investment		693	1,077
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		91	263
Financing Receivable, Individually Evaluated for Impairment		784	1,340
Average balance		829	1,678	958
Interest income recognized		38	98	55
Allowance for loan and lease losses		1,485	892	681		1,721
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			5,717
Unpaid principal balance		25,043	15,746
ALLL for loans and leases individually evaluated for impairment		1,212	1,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment		10,097	10,198
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		12,889	4,715
Financing Receivable, Individually Evaluated for Impairment		22,986	14,913
Average balance		18,524	15,487	15,470
Interest income recognized		557	593	444
Allowance for loan and lease losses		14,105	10,661	10,511		3,836
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(9,838)
Unpaid principal balance		7,120	4,933
ALLL for loans and leases individually evaluated for impairment		299	1,052
Impaired Financing Receivable, with Related Allowance, Recorded Investment		1,105	3,675
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		4,778	0
Financing Receivable, Individually Evaluated for Impairment		5,883	3,675
Average balance		4,368	3,922	5,653
Interest income recognized		97	134	485
Allowance for loan and lease losses		15,971	18,650	16,239		25,185
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(10,018)
Unpaid principal balance		1,294	1,067
ALLL for loans and leases individually evaluated for impairment		527	555
Impaired Financing Receivable, with Related Allowance, Recorded Investment		1,050	987
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		188	8
Financing Receivable, Individually Evaluated for Impairment		1,238	995
Average balance		1,126	1,535	1,427
Interest income recognized		75	88	53
Allowance for loan and lease losses		19,496	16,555	13,541		25,389
Non-PCI Loans | Noncommercial | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			(15,772)
Allowance for loan and lease losses		0	0	0		15,850
PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	[1]			0
Acquired loans which have adverse change in expected cash flows		469,252	285,636
Allowance for loan and lease losses		16,312	21,629	53,520		139,972
PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		773	75	1,354		11,234
PCI Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		1,082	150	1,320		31,186
PCI Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		7,838	10,135	29,906		50,275
PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		445	1,240	5,275		8,897
PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		0	183	682		8,287
PCI Loans | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		5,398	5,820	11,802		19,837
PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		$ 523	$ 3,999	$ 2,959		$ 9,754
[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 73

Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details)	12 Months Ended
	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 144,843,000	$ 151,479,000
Impaired Loans and Leases, Baseline for Meaurement	$ 500,000
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	372	248
Nonaccruing	$ 95,854,000	$ 44,005,000
Financing Receivable, Modifications, Recorded Investment	114,192,000	104,607,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 37,183,000	$ 30,869,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	50	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 8,326,000	$ 1,180,000
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	18	79
Nonaccruing	$ 7,579,000	$ 33,422,000
Financing Receivable, Modifications, Recorded Investment	30,600,000	46,872,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,752,000	$ 12,206,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	15
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96,000	$ 214,000
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	104,978,000	118,166,000
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,881,000	3,037,000
Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	425,000	343,000
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	84,540,000	101,121,000
Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	42,116,000	24,720,000
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,840,000	2,823,000
Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	239,000	619,000
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,174,000	10,528,000
Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	6,235,000	1,741,000
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,360,000	623,000
Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	389,000	374,000
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,183,000	34,000
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	39,865,000	33,313,000
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	784,000	1,391,000
Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	2,164,000	0
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	32,556,000	27,252,000
Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	29,977,000	14,242,000
Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	133,000	1,966,000
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,305,000	3,675,000
Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	12,704,000	0
Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,220,000	995,000
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	113,296,000	135,963,000
Performing Financial Instruments [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	82,394,000	107,305,000
Performing Financial Instruments [Member] | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,624,000	2,591,000
Performing Financial Instruments [Member] | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	65,812,000	92,184,000
Performing Financial Instruments [Member] | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,751,000	2,374,000
Performing Financial Instruments [Member] | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,833,000	9,864,000
Performing Financial Instruments [Member] | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,191,000	258,000
Performing Financial Instruments [Member] | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,183,000	34,000
Performing Financial Instruments [Member] | Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	30,902,000	28,658,000
Performing Financial Instruments [Member] | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	784,000	1,391,000
Performing Financial Instruments [Member] | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	25,427,000	22,597,000
Performing Financial Instruments [Member] | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,600,000	3,675,000
Performing Financial Instruments [Member] | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,091,000	995,000
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Nonaccruing	31,547,000	15,516,000
Nonperforming Financial Instruments [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Nonaccruing	22,584,000	10,861,000
Nonperforming Financial Instruments [Member] | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Nonaccruing	257,000	446,000
Nonperforming Financial Instruments [Member] | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing	18,728,000	8,937,000
Nonperforming Financial Instruments [Member] | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Nonaccruing	89,000	449,000
Nonperforming Financial Instruments [Member] | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Nonaccruing	3,341,000	664,000
Nonperforming Financial Instruments [Member] | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Nonaccruing	169,000	365,000
Nonperforming Financial Instruments [Member] | Commercial | Other
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Nonperforming Financial Instruments [Member] | Noncommercial
Financing Receivable, Modifications [Line Items]
Nonaccruing	8,963,000	4,655,000
Nonperforming Financial Instruments [Member] | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Nonperforming Financial Instruments [Member] | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing	7,129,000	4,655,000
Nonperforming Financial Instruments [Member] | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,705,000	0
Nonperforming Financial Instruments [Member] | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Nonaccruing	$ 129,000	$ 0
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	27	63
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 4,858,000	$ 8,404,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 334,000	$ 0
Extended Maturity [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 178,000	$ 700,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 53,000
Extended Maturity [Member] | Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 18,000	$ 187,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 18,000	$ 0
Extended Maturity [Member] | Commercial | Construction and land development | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 332,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	12	18
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,144,000	$ 4,848,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 316,000	$ 0
Extended Maturity [Member] | Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,380,000	$ 2,274,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 146,000	$ 198,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 226,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Noncommercial | Construction and land development | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 51,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	19
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 110,000	$ 572,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Noncommercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 178,000	$ 317,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 53,000
Extended Maturity [Member] | Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	218	137
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 24,728,000	$ 17,345,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	24	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 6,327,000	$ 486,000
Interest Rate Below Market Reduction [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	14	47
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,187,000	$ 9,847,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96,000	$ 161,000
Interest Rate Below Market Reduction [Member] | Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	21	11
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 992,000	$ 372,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 122,000	$ 0
Interest Rate Below Market Reduction [Member] | Commercial | Construction and land development | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 116,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	37	44
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 13,900,000	$ 12,642,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,969,000	$ 441,000
Interest Rate Below Market Reduction [Member] | Commercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	16
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 5,783,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 138,000
Interest Rate Below Market Reduction [Member] | Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 122,000	$ 337,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member] | Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	15	13
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,301,000	$ 751,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,619,000	$ 0
Interest Rate Below Market Reduction [Member] | Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 253,000	$ 389,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member] | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	116	41
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,695,000	$ 2,444,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	14	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 607,000	$ 45,000
Interest Rate Below Market Reduction [Member] | Noncommercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	14	29
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,187,000	$ 3,948,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96,000	$ 23,000
Interest Rate Below Market Reduction [Member] | Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,183,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member] | Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 136,000	$ 217,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	121	36
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,545,000	$ 2,745,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	23	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,665,000	$ 330,000
Discharge of Debt [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	26
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 387,000	$ 1,659,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 38,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,000	$ 0
Discharge of Debt [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,897,000	$ 949,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 644,000	$ 0
Discharge of Debt [Member] | Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 62,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 62,000
Discharge of Debt [Member] | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	29	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,454,000	$ 1,067,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 242,000	$ 268,000
Discharge of Debt [Member] | Noncommercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	26
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 282,000	$ 1,659,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	56	17
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,714,000	$ 663,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 701,000	$ 0
Discharge of Debt [Member] | Noncommercial | Revolving mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 105,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,052,000	$ 2,375,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 364,000
Principal Forgiveness [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 185,000	$ 1,973,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 364,000
Principal Forgiveness [Member] | Commercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 776,000	$ 250,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 118,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 91,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 34,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0

Allowance for Loan and Lease 74

Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 144,843	$ 151,479
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	104,978	118,166
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,881	3,037
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	84,540	101,121
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,840	2,823
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,174	10,528
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,360	623
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,183	34
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	39,865	33,313
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	784	1,391
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	32,556	27,252
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,305	3,675
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 114,192	$ 104,607
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	50	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 8,326	$ 1,180
Financing Receivable, Modifications, Number of Contracts | loans	372	248
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 37,183	$ 30,869
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 30,600	$ 46,872
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	15
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96	$ 214
Financing Receivable, Modifications, Number of Contracts | loans	18	79
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,752	$ 12,206
Principal Forgiveness [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 364
Financing Receivable, Modifications, Number of Contracts | loans	6	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,052	$ 2,375
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 364
Financing Receivable, Modifications, Number of Contracts | loans	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 185	$ 1,973
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 776	$ 250
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 118
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 91	$ 0
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 34
Principal Forgiveness [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 334	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	27	63
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 4,858	$ 8,404
Extended Maturity [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 18	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 18	$ 187
Extended Maturity [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 316	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	12	18
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,144	$ 4,848
Extended Maturity [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	5	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,380	$ 2,274
Extended Maturity [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 146	$ 198
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 226
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	19
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 110	$ 572
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8	$ 0
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 52	$ 99
Extended Maturity [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 53
Financing Receivable, Modifications, Number of Contracts | loans	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 178	$ 700
Extended Maturity [Member] | PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 332
Extended Maturity [Member] | PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 51
Extended Maturity [Member] | PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 53
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 178	$ 317
Interest Rate Below Market Reduction [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	24	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 6,327	$ 486
Financing Receivable, Modifications, Number of Contracts | loans	218	137
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 24,728	$ 17,345
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 122	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	21	11
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 992	$ 372
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,969	$ 441
Financing Receivable, Modifications, Number of Contracts | loans	37	44
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 13,900	$ 12,642
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 122	$ 337
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,619	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	15	13
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,301	$ 751
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 253	$ 389
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	14	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 607	$ 45
Financing Receivable, Modifications, Number of Contracts | loans	116	41
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,695	$ 2,444
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	6	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 136	$ 217
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 10	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	18	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 146	$ 193
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,183	$ 0
Interest Rate Below Market Reduction [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96	$ 161
Financing Receivable, Modifications, Number of Contracts | loans	14	47
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,187	$ 9,847
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 116
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 138
Financing Receivable, Modifications, Number of Contracts | loans	0	16
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 5,783
Interest Rate Below Market Reduction [Member] | PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96	$ 23
Financing Receivable, Modifications, Number of Contracts | loans	14	29
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,187	$ 3,948
Discharge of Debt [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	23	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,665	$ 330
Financing Receivable, Modifications, Number of Contracts | loans	121	36
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,545	$ 2,745
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 38	$ 0
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 644	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,897	$ 949
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 62
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 62
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 242	$ 268
Financing Receivable, Modifications, Number of Contracts | loans	29	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,454	$ 1,067
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 146	$ 0
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	7	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 75	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	25	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 296	$ 4
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 701	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	56	17
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,714	$ 663
Discharge of Debt [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	26
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 387	$ 1,659
Discharge of Debt [Member] | PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	26
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 282	$ 1,659
Discharge of Debt [Member] | PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 105	$ 0

Premises and Equipment (Major C

Premises and Equipment (Major Classifications) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,810,954	$ 1,785,582
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	675,125	660,501
Property, Plant and Equipment, Net	1,135,829	1,125,081
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	279,932	284,682
Premises and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,089,644	1,056,126
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 441,378	$ 444,774

Premises and Equipment (Operati

Premises and Equipment (Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Due 2,014	$ 18,543
Due 2,015	14,415
Due 2,016	11,017
Due 2,017	8,040
Due 2,018	5,589
Due thereafter	43,407
Total minimum payments	101,011
Rent expense, net	13,800	$ 18,500	$ 21,400
Rent income	$ 6,400	$ 2,700	$ 1,800

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount			$ 15,600	$ 24,800
Covered
Beginning Balance	$ 22,982	$ 47,081
Additions	7,357	29,708
Sales	(19,629)	(38,753)
Writedowns	(1,478)	(10,853)
Other Real Estate Covered Transfers	(2,415)	(5,537)
Noncovered
Beginning balance	70,454	36,898
Additions	47,866	36,574
Sales	(56,853)	(48,935)
Writedowns	(5,140)	(5,219)
Other Real Estate Non Covered Transfers	2,415	5,537
Total
Beginning balance	93,436	83,979
Additions	55,223	66,282
Sales	(76,482)	(87,688)
Writedowns	(6,618)	(16,072)
Other Real Estate Transfers	0	0
Ending balance	93,436	83,979	65,559	93,436
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
Mortgage
Total
Beginning balance	29,048
Ending balance	$ 29,048		$ 16,071	$ 29,048

FDIC Indemnification Asset (Cha

FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ 28,701	$ 93,397	$ 270,192
FDIC Indemnification Asset, Acquisitions	0	5,106	0
Accretion of discounts and premiums, net	(10,899)	(43,422)	(85,651)
Receipt of payments from FDIC	33,296	1,286	(19,373)
Post-acquisition and other adjustments, net	(47,044)	(27,666)	(71,771)
Ending balance	$ 4,054	$ 28,701	$ 93,397

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgage Banking [Abstract]
Servicing Asset at Amortized Cost	$ 19,351,000	$ 16,688,000	$ 16,000

Deposits (Details)

Deposits (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
FDIC Deposit Insurance Limit	$ 250,000
Time Deposits Greater than $250,000, Carrying Value	578,100,000	$ 552,300,000
Deposits, by Type [Abstract]
Demand	9,274,470,000	8,086,784,000
Checking With Interest	4,445,353,000	4,091,333,000
Money market accounts	8,205,705,000	8,264,811,000
Savings	1,909,021,000	1,728,504,000
Time	3,096,206,000	3,507,145,000
Total deposits	26,930,755,000	$ 25,678,577,000
Maturities of Time Deposits [Abstract]
2,014	2,359,710,000
2,015	453,560,000
2,016	114,448,000
2,017	111,857,000
2,018	56,631,000
Thereafter	$ 0

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Short-term borrowings	$ 594,733	$ 987,184
Master Notes [Member]
Short-term Debt [Line Items]
Short-term borrowings	0	410,258
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term borrowings	592,182	294,426
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term borrowings	0	80,000
Maturities Of Debt	80,000
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings	2,551	2,551
Unsecured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	740,000
Secured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	5,570,000
Subordinated Debt Obligations [Member]
Short-term Debt [Line Items]
Short-term borrowings	0	$ 199,949
Maturities Of Debt	$ 199,900

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase, Gross	$ 622,182	$ 324,426
Securities Sold under Agreements to Repurchase	622,182	324,426
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	722,000	418,300
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	592,182	294,426
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	30,000	30,000
Government Agency
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	4,276	6,914
Government Agency | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Government Agency | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Government Agency | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Government Agency | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	4,276	6,914
U. S. Treasury
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	617,906	186,011
U. S. Treasury | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	592,182	162,925
U. S. Treasury | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
U. S. Treasury | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	0	0
U. S. Treasury | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	$ 25,724	23,086
Mortgage Backed Securities, Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		131,501
Mortgage Backed Securities, Other | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		131,501
Mortgage Backed Securities, Other | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0
Mortgage Backed Securities, Other | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0
Mortgage Backed Securities, Other | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		$ 0

Long-Term Obligations (Details)

Long-Term Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]
2,014	$ 3,401
2,015	13,440
2,016	135,232
2,017	246
2,018	261
Thereafter	551,575
Total long-term obligations	704,155	$ 351,320
Trust Preferred Securities	128,500
Junior Subordinated Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	132,476
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	96,392
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	25,774	26,547
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	$ 10,310	10,310
Subordinated Debt [Member] | Subordinated Notes Payable At 5 Point 125 Percent Maturing June 1 2015 [Member]
Debt Instrument [Line Items]
Debt interest rate	5.125%
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	15,000
Capital Lease Obligations [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	9,226	3,150
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	$ 510,252	160,268
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	10,000
Unamortized Acquisition Accounting Adjustments [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	(2,907)	(466)
Other Long Term Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 30,108	$ 30,119
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinanted Debenture at 3 Month Libor Plus 1.75% Maturing June 30, 2036 [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	1.75%
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 25 Percent Maturing June 15 2034 [Member] [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	2.25%
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 85 Percent Maturing April 7 2034 [Member] [Member]
Debt Instrument [Line Items]
Description of variable rate basis	3-month LIBOR
Basis spread on variable rate	2.85%

Estimated Fair Values (Narrativ

Estimated Fair Values (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 6,861,293	$ 7,171,917
Fair value of investment securities with nonobservable inputs	0	0
Asset transfers between Level 1 and Level 2	0	0
Asset transfers between Level 2 and Level 1	0	0
Liability transfers between Level 1 and Level 2	0	0
Liability transfers between Level 2 and Level 1	0	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability measured at fair value on nonrecurring basis	0	0
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
Fair Value, Measurements, Recurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 6,861,293	$ 7,171,917
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective Interest Rate For Discounted Cash Flow	2.00%	2.00%
Discounts for collateral value estimates due to estimated holding and selling costs (percent)	10.00%	10.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective Interest Rate For Discounted Cash Flow	16.00%	16.00%
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 ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		$ 534,086	$ 604,182
Overnight investments		2,063,132	1,724,919
Investment securities available for sale		6,861,293	7,171,917
Investment securities held to maturity		255	518
Loans and Leases Receivable, Net Amount		20,033,774	18,564,999
FDIC Indemnification Asset		4,054	28,701	$ 93,397	$ 270,192
Income earned not collected		70,036	57,254
Deposits		26,930,755	25,678,577
Short-term borrowings		594,733	987,184
Long-term obligations		704,155	351,320
FDIC loss share payable		126,453	116,535
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		534,086	604,182
Overnight investments		2,063,132	1,724,919
Investment securities available for sale		6,861,293	7,171,917
Investment securities held to maturity		255	518
Loans held for sale		59,766	63,696
Loans and Leases Receivable, Net Amount		20,033,774	18,564,999
FDIC Indemnification Asset	[1]	4,054	28,701
Income earned not collected		70,036	57,254
Stock issued by Federal Home Loan Bank		37,511	39,113
Servicing Asset		19,351	16,688
Deposits		26,930,755	25,678,577
Short-term borrowings		594,733	987,184
Long-term obligations		704,155	351,320
FDIC loss share payable		126,453	116,535
Accrued interest payable		5,713	8,194
Derivative Liability, Fair Value, Gross Liability		1,429	4,337
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		534,086	604,182
Overnight investments		2,063,132	1,724,919
Investment securities available for sale		6,861,293	7,171,917
Investment securities held to maturity		265	544
Loans held for sale		59,766	63,696
Loans and Leases Receivable, Net Amount		19,353,325	18,046,497
FDIC Indemnification Asset	[1]	4,054	18,218
Income earned not collected		70,036	57,254
Stock issued by Federal Home Loan Bank		37,511	39,113
Servicing Asset		19,495	16,736
Deposits		26,164,472	25,164,683
Short-term borrowings		594,733	987,184
Long-term obligations		718,102	367,732
FDIC loss share payable		131,894	122,168
Accrued interest payable		5,713	8,194
Derivative Liability, Fair Value, Gross Liability		$ 1,429	$ 4,337
[1]	.

Estimated Fair Values (Assets A

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 6,861,293	$ 7,171,917
Loans held for sale	59,766	63,696
Fair Value, Measurements, Recurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	6,861,293	7,171,917
Loans held for sale	59,766
Interest rate swaps accounted for as cash flow hedges	1,429	4,337
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	1,668	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	6,859,625	7,171,917
Loans held for sale	59,766
Interest rate swaps accounted for as cash flow hedges	1,429	4,337
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	1,674,882	2,629,670
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	1,674,882	2,629,670
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	498,660	908,817
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	498,660	908,817
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 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	4,668,198	3,633,304
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | 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 | 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	4,668,198	3,633,304
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | 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	10,660
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	10,660
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	8,893
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	1,668
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	7,225
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
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
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
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

Estimated Fair Values Estimated

Estimated Fair Values Estimated Fair Values (Fair Value Option) (Details) - Loans Held For Sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 176	$ 202
Fair Value Of Items For Which Fair Value Option Was Elected Assets	59,766	63,696
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets	58,890	62,996
Fair Value Option Aggregate Difference Assets	$ 876	$ 700

Estimated Fair Values (Assets88

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Non Covered	$ 58,742	$ 70,454	$ 36,898
Other Real Estate, Covered	6,817	22,982	$ 47,081
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	64,197	73,170
Other Real Estate, Non Covered	44,571	40,714
Other Real Estate, Covered	4,403	17,664
Servicing Asset	17,997	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
Other Real Estate, Non Covered	0	0
Other Real Estate, Covered	0	0
Servicing Asset	0	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
Other Real Estate, Non Covered	0	0
Other Real Estate, Covered	0	0
Servicing Asset	0	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	64,197	73,170
Other Real Estate, Non Covered	44,571	40,714
Other Real Estate, Covered	4,403	17,664
Servicing Asset	$ 17,997	$ 13,562

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Variance		10.00%
Defined Contribution Plan, Cost Recognized			$ 16,400	$ 14,900
Employer contributions		$ 30,000
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage		100.00%
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	100.00%	100.00%	100.00%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 536,956	$ 533,125	$ 536,956
Employer contributions		$ 30,000	$ 0
Assumed discount rate (percent)		4.27%	4.90%	4.00%
Assumed rate of salary increases		4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)		7.50%	7.50%	7.25%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments		$ 2,076	$ 0
Defined Benefit Plan, Accumulated Benefit Obligation	$ 136,425	$ 131,879	$ 136,425
Assumed discount rate (percent)		4.27%	4.35%
Assumed rate of salary increases		4.00%	4.00%
Expected long-term rate of return on plan assets (percent)		7.50%	7.50%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized			$ 1,100
Percent of employer match	100.00%
Percentage of employee compensation matched	6.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage		100.00%
Employee profit sharing contribution percentage	3.00%
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized		$ 22,600
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%
401(k) Matching Range 2 | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match	50.00%
Percentage of employee compensation matched	3.00%
401(k) Matching Range 1 | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match	100.00%
Percentage of employee compensation matched	3.00%

Employee Benefit Plans (Funded

Employee Benefit Plans (Funded Status Of Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	$ 30,000
BancShares Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	627,645	$ 530,678
Service cost	14,083	12,332	$ 16,332
Interest cost	26,975	25,615	23,686
Actuarial (gain) loss	(39,002)	76,122
Benefits paid	(18,199)	(17,102)
Benefit obligation at December 31	611,502	627,645	530,678
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	544,956	524,017
Actual return on plan assets	(6,732)	38,041
Employer contributions	30,000	0
Benefits paid	(18,199)	(17,102)
Fair value of plan assets, ending balance	550,025	544,956	524,017
Funded status	(61,477)	(82,689)
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments	(2,076)	0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	151,332	137,452
Service cost	3,341	832
Interest cost	6,393	1,488
Actuarial (gain) loss	(10,937)	12,802
Benefits paid	(4,812)	(1,242)
Benefit obligation at December 31	143,241	151,332	137,452
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	155,618	0
Actual return on plan assets	87	6,486
Benefits paid	(4,812)	(1,242)
Fair value of plan assets, ending balance	150,893	155,618	$ 0
Funded status	$ 7,652	$ 4,286

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized in the Financial Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Bancorporation Plan
Amounts recognized in the consolidated balance sheets
Other assets	$ 0	$ 0
Other liabilities	7,652	4,286
Net asset (liability) recognized	7,652	4,286
Amount recognized in accumulated other comprehensive income
Net loss (gain)	7,505	9,123
Less prior service cost	0	0
Accumulated other comprehensive loss, excluding income taxes	7,505	9,123
BancShares Plan
Amounts recognized in the consolidated balance sheets
Other assets	0	0
Other liabilities	(61,477)	(82,689)
Net asset (liability) recognized	(61,477)	(82,689)
Amount recognized in accumulated other comprehensive income
Net loss (gain)	70,358	80,806
Less prior service cost	556	767
Accumulated other comprehensive loss, excluding income taxes	70,914	$ 81,573
Actuarial loss	6,398
Prior service cost	210
Total	$ 6,608

Employee Benefit Plans (Net Ben

Employee Benefit Plans (Net Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total change in pension obligation, net of tax	$ 11,586	$ 5,358	$ 17,195
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	14,083	12,332	16,332
Interest cost	26,975	25,615	23,686
Expected return on assets	(33,198)	(31,269)	(27,733)
Amortization of prior service cost	(210)	(210)	(210)
Amortization of net actuarial loss	11,376	5,148	16,985
Total pension expense	19,446	12,036	29,480
Current year actuarial gain (loss)	(927)	(69,349)	123,557
Total change in pension obligation, net of tax	(10,659)	63,991	(140,752)
Total recognized in net periodic benefit cost and other comprehensive income	8,787	76,027	$ (111,272)
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	3,341	832
Interest cost	6,393	1,488
Expected return on assets	(11,482)	(2,807)
Defined Benefit Plan, Curtailments	(2,076)	0
Total pension expense	(1,748)	(487)
Current year actuarial gain (loss)	(458)	(9,123)
Total change in pension obligation, net of tax	(1,618)	9,123
Total recognized in net periodic benefit cost and other comprehensive income	$ (3,366)	$ 8,636

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
BancShares Plan
Assumptions used to determine the benefit obligations
Discount rate	4.68%	4.27%
Rate of compensation increase	4.00%	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.27%	4.90%	4.00%
Rate of compensation increase	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.50%	7.25%
Bancorporation Plan
Assumptions used to determine the benefit obligations
Discount rate	4.68%	4.27%
Rate of compensation increase	4.00%	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.27%	4.35%
Rate of compensation increase	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.50%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 01, 2014	Dec. 31, 2013
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 550,025	$ 544,956		$ 524,017
Actual % of Plan Assets	100.00%	100.00%
BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 550,025	$ 544,956
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	469,647	391,028
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	80,378	153,928
BancShares Plan | 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	150,893	155,618	$ 150,374	$ 0
Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	150,893	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	126,392	143,938
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	24,501	11,680
Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Cash and equivalents | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	5.00%	1.00%
Cash and equivalents | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Cash and equivalents | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	1.00%	1.00%
Cash and equivalents | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 26,613	$ 3,854
Cash and equivalents | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	26,613	3,854
Cash and equivalents | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Cash and equivalents | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Cash and equivalents | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	8.90%	8.40%
Cash and equivalents | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 13,437	$ 13,077
Cash and equivalents | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,437	13,077
Cash and equivalents | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Cash and equivalents | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Equity Securities | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	63.00%	62.00%
Equity Securities | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	55.00%	55.00%
Equity Securities | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%	65.00%
Equity Securities | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 267,037	$ 284,656
Equity Securities | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	267,037	284,656
Equity Securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity Securities | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Equity Securities | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%
Actual % of Plan Assets	63.00%	69.00%
Equity Securities | Bancorporation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Equity Securities | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 80,676	$ 101,540
Equity Securities | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	80,676	101,540
Equity Securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity Securities | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Debt Securities | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	26.00%	28.00%
Debt Securities | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	25.00%	25.00%
Debt Securities | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	40.00%	40.00%
Debt Securities | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	22.00%	23.00%
Equity mutual funds | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 78,645	$ 52,379
Equity mutual funds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	78,645	52,379
Equity mutual funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity mutual funds | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity mutual funds | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	15,005	5,793
Equity mutual funds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	15,005	5,793
Equity mutual funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity mutual funds | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
US government and government agency securities | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	58,526	23,528
US government and government agency securities | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	48,957	23,528
US government and government agency securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,569	0
US government and government agency securities | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
US government and government agency securities | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	20,476
US government and government agency securities | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,986
US government and government agency securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	16,490
US government and government agency securities | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Corporate Bonds | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	70,809
Corporate Bonds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Corporate Bonds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	70,809
Corporate Bonds | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Corporate Bonds | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	8,011	11,680
Corporate Bonds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Corporate Bonds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	8,011	11,680
Corporate Bonds | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Fixed Income Mutual Funds | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	17,351	153,928
Fixed Income Mutual Funds | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	17,351	0
Fixed Income Mutual Funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	153,928
Fixed Income Mutual Funds | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	$ 0
Fixed Income Mutual Funds | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,198
Fixed Income Mutual Funds | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,198
Fixed Income Mutual Funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Fixed Income Mutual Funds | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0
Alternative investments | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	6.00%	9.00%
Alternative investments | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Alternative investments | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	10.00%	8.00%
Alternative investments | BancShares Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 31,044	$ 50,139
Alternative investments | BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	31,044	50,139
Alternative investments | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Alternative investments | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 0
Alternative investments | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	6.00%
Defined Benefit Plan, Target Allocation Percentage	0.05
Alternative investments | Bancorporation Plan | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 9,090
Alternative investments | Bancorporation Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,090
Alternative investments | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Alternative investments | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0
Fixed Income And Cash | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%

Employee Benefit Plans (Project

Employee Benefit Plans (Projected Benefit Payments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 30,000
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	533,125	$ 536,956
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	30,000	0
2,014	21,607
2,015	23,268
2,016	24,895
2,017	26,450
2,018	28,207
2019-2023	166,567
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	131,879	$ 136,425
2,014	5,463
2,015	5,969
2,016	6,420
2,017	6,791
2,018	7,209
2019-2023	$ 43,671

Employee Benefit Plans (Present

Employee Benefit Plans (Present Value of Accrued Liability) (Details) - Executives Directors And Officer Of Acquired Entities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Present Value Of Accrued Liability [Roll Forward]
Present value of accrued liability as of January 1	$ 43,211	$ 23,960
Executive compensation liability acquired from 1st Financial	0	1,455
Executive compensation liability acquired from Bancorporation	0	17,333
Benefit expense	1,386	2,682
Benefits paid	(4,485)	(2,219)
Benefits forfeited	(234)	0
Present value of accrued liability as of December 31	$ 39,878	$ 43,211

Other Noninterest Income and 97

Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 36,359	$ 29,277	$ 49,749
Other Noninterest Expense	269,858	210,629	193,014
PCI Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	21,200	16,200	29,700
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,406	10,834	10,033
Cardholder Reward Programs
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,069	8,252	6,266
Processing Fees Paid To Third Parties
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,779	17,089	15,095
Cardholder Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	21,735	15,133	13,780
Merchant Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	58,231	42,661	35,279
Collection
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	9,649	11,595	21,209
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	8,925	10,168	9,740
Core Deposit Intangible Amortization [Member]
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,892	6,955	2,308
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,431	11,461	8,286
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 95,741	$ 76,481	$ 71,018

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense
Federal	$ 105,367	$ 84,430	$ 46,848
State	16,111	13,941	7,080
Total current tax expense	121,478	98,371	53,928
Deferred Income Tax Expense (Benefit)
Federal	(2,758)	(30,658)	38,731
State	3,308	(2,681)	8,915
Total deferred tax expense (benefit)	550	(33,339)	47,646
Total income tax expense	$ 122,028	65,032	101,574
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory rate	35.00%
Income taxes at statutory rates	$ 116,345	71,258	93,956
Nontaxable income on loans, leases and investments, net of nondeductible expenses	(3,020)	(1,832)	(1,185)
State and local income taxes, including change in valuation allowance, net of federal income tax benefit	12,622	7,319	10,397
Effective Income Tax Rate Reconciliation, Acquisition Stock Settlement, Amount	0	(10,185)	0
Tax credits	(3,060)	(2,896)	(960)
Other, net	(859)	1,368	(634)
Total income tax expense	122,028	65,032	$ 101,574
Deferred Tax Assets, Net [Abstract]
Allowance for loan and lease losses	78,878	79,537
Pension liability	7,206	17,147
Executive separation from service agreements	9,856	13,753
State operating loss carryforwards	21	29
Unrealized loss on cash flow hedge	537	1,673
Net unrealized loss on securities included in accumulated other comprehensive loss	9,379	0
Deferred Tax Assets, Property, Plant and Equipment	13,195	3,495
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences, Amount	66,456	77,388
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	10,772	12,770
Other	29,279	26,788
Gross deferred tax asset	225,579	232,580
Lease financing activities	15,492	12,706
Net unrealized gain on securities included in accumulated other comprehensive loss	0	3,245
Net deferred loan fees and costs	6,051	4,532
Intangible assets	2,040	7,789
Deferred Tax Liability, Mark to Market Section 475, Amount	31,486	40,910
Other	12,026	13,287
Deferred tax liability	67,095	82,469
Net deferred tax assets	$ 158,484	$ 150,111

Transactions with Related Per99

Transactions with Related Persons (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Loans Sold In Branch Sale	$ 8,700
Deposits Sold In Branch Sale	31,200
Deposit Premium On Deposits Sold Inc Branch Sale	301
Payments For Branch Sale	22,200
Gain On Sale Of Branch	216
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	1,045	$ 1,825
New loans	5	39
Repayments	(971)	(819)
Ending balance	79	1,045	$ 1,825
Unfunded loan commitments available to related parties	1,400	1,300
Revenue from related parties	100	17,200	21,600
Revenue from largest individual institution related parties	$ 100	16,800	$ 20,400
Investment Securities Available For Sale Related Parties		25,000
Investment Cost Related Parties		$ 23,000

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Fair value of collateral pledged to secure interest rate contracts	$ 2,017	$ 7,000
Incremental interest expense paid to interest rate swap counterparties	3,294	$ 3,321	$ 3,281
Interest Rate Swap
Derivative [Line Items]
Gain (loss) expected to be reclassified in next 12 months	(1,136)
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 ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Estimated fair value of liability	$ 1,429	$ 4,337
Derivative, Notional Amount	$ 93,500	$ 93,500

Goodwill and Intangible Asse102

Goodwill and Intangible Assets (Details)	Oct. 02, 2014USD ($)	Jan. 02, 2014USD ($)	Dec. 31, 2015USD ($)$ / loansRate	Dec. 31, 2014USD ($)$ / loansRate	Dec. 31, 2013USD ($)
Servicing Asset at Amortized Cost [Line Items]
Servicing Asset at Amortized Cost			$ 19,351,000	$ 16,688,000	$ 16,000
Servicing Asset at Amortized Cost, Additions			5,910,000	727,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance			95,000	850,000	0
Residential Mortgage Loans Serviced			$ 2,150,000,000	$ 1,950,000,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate			11.01%	14.25%
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets			$ 5,400,000	$ 600,000	300,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans			56,610	56,020
Amortization			$ (4,002,000)	$ (919,000)	(205,000)
Goodwill [Roll Forward]
Beginning goodwill		$ 102,625,000	139,773,000	102,625,000
Ending goodwill			139,773,000	139,773,000	102,625,000
Finite-lived Intangible Assets [Roll Forward]
Beginning balance			106,610,000
Finite Lived Intangible Assets Removed Due To Branch Sale			(85,000)	0
Amortization			(18,892,000)	(6,955,000)
Ending balance			90,986,000	106,610,000
Finite-Lived Intangible Assets [Abstract]
Gross balance			115,201,000	114,596,000
Accumulated amortization			(43,566,000)	(24,674,000)
Carrying value			71,635,000	89,922,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,015			16,440,000
2,016			14,075,000
2,017			11,710,000
2,018			9,457,000
2,019			7,492,000
Other Intangible Assets, Net			71,635,000	89,922,000	$ 1,247,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries)			755,000	(850,000)
Capitol City Bank and Trust
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired			690,000	0
1st Financial
Servicing Asset at Amortized Cost [Line Items]
Finite-Lived Core Deposits, Gross			3,800,000
Servicing Asset at Fair Value, Additions			0	148,000
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			$ 0	3,780,000
Bancorporation
Servicing Asset at Amortized Cost [Line Items]
Finite-Lived Core Deposits, Gross			91,900,000
Servicing Asset at Fair Value, Additions			0	17,566,000
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			$ 0	$ 91,850,000
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 | Rate			9.31%	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 | Rate			10.31%	9.20%
Core deposits | Minimum
Goodwill [Roll Forward]
Useful life			2 years
Core deposits | Maximum
Goodwill [Roll Forward]
Useful life			9 years

Shareholders' Equity, Divide103

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)voteshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities included in Tier 1 capital	$ 32,100	$ 128,500
Capital required for common equity Tier 1 capital to risk-weighted assets	4.50%
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%
Leverage Capital Required Ratio To Tangible Assets	4.00%
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	$ 6,000	$ 9,000
Subordinated Debt, Annual Tier 2 Discount Percentage	20.00%
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status	$ 902,600
Average Required Maintence Of Non Interst Bearing Reserve Balance	$ 531,600
Capital Conservation Buffer, Annual Percentage Increase	0.625%
Capital Conservation Buffer	2.50%
Common Class A [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock | vote	1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares	100,000
Stock Repurchased During Period, Shares | shares		167,600
Class B Common Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock | vote	16
Stock Repurchased and Retired During Period, Shares | shares	0	45,900
Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividend Income, Banking Subsidiaries	$ 75,006	$ 82,419	$ 131,006
BancShares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	2,831,242	2,690,324
Capital Required for Capital Adequacy	3,140,212	2,904,123
Leverage Capital Required for Capital Adequacy	$ 2,831,242	$ 2,690,324
Tier 1 Risk Based Capital to Risk Weighted Assets	12.65%	13.61%
Capital to Risk Weighted Assets	14.03%	14.69%
Leverage Capital to Average Assets	8.96%	8.91%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Common equity Tier 1	$ 2,799,163
Common equity Tier 1 to risk-weighted assets	12.50965%
Common equity Tier 1 required to be well capitalized to risk-weighted assets	6.50%
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
Capital Required for Capital Adequacy		657,475
Leverage Capital Required for Capital Adequacy		$ 653,515
Tier 1 Risk Based Capital to Risk Weighted Assets		15.11%
Capital to Risk Weighted Assets		15.20%
Leverage Capital to Average Assets		7.89%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		6.00%
Capital Required to be Well Capitalized		10.00%
Leverage Capital Required to be Well Capitalized to Average Assets		5.00%
FCB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	$ 2,821,475	$ 2,019,595
Capital Required for Capital Adequacy	3,038,070	2,212,163
Leverage Capital Required for Capital Adequacy	$ 2,821,475	$ 2,019,595
Tier 1 Risk Based Capital to Risk Weighted Assets	12.64%	13.12%
Capital to Risk Weighted Assets	13.61%	14.37%
Leverage Capital to Average Assets	8.95%	9.30%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Common equity Tier 1	$ 2,821,475
Common equity Tier 1 to risk-weighted assets	12.63988%
Common equity Tier 1 required to be well capitalized to risk-weighted assets	6.50%
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	$ 75,006	$ 30,000

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 85,600	$ 57,100
FDIC loss share receivable	4,054	28,701	$ 93,397	$ 270,192
FDIC loss share payable	126,453	116,535
Commitments to Extend Credit
Guarantor Obligations [Line Items]
Unused Commitments to Extend Credit	7,950,000	7,190,000
Affordable Housing Program Obligation	41,800	16,800
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor obligations amount	$ 77,939	77,374
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	$ 3,000	$ 3,203

Accumulated Other Comprehens105

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), before Tax		$ (104,352)	$ (86,690)
Long-term obligations		924,905	710,097		$ 740,186
Deferred tax expense (benefit)		(39,912)	(33,709)
Accumulated other comprehensive income (loss), net of tax		(64,440)	(52,981)		(25,268)
Income taxes		(122,028)	(65,032)		(101,574)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	81	14,598
Securities gains (losses)		10,817	29,096		0
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), before Tax		(24,504)	8,343
Deferred tax expense (benefit)		(9,379)	3,245
Accumulated other comprehensive income (loss), net of tax	[2]	(15,125)	5,098		(10,091)
Income taxes	[1]	(4,138)	(11,224)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1],[2]	6,679	17,872
Securities gains (losses)	[1]	10,817	29,096
Funded Status of Defined Benefit Plan
Accumulated Other Comprehensive Income (Loss), before Tax		(78,419)	(90,696)
Deferred tax expense (benefit)		(29,996)	(35,281)
Accumulated other comprehensive income (loss), net of tax	[2]	(48,423)	(55,415)		(10,743)
Income taxes	[1]	4,988	2,084
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1],[2]	(6,598)	(3,274)
Employee Benefits, prior service costs	[1]	(210)	(210)
Reclassification adjustment for losses included in income before income taxes	[1]	(11,376)	(5,148)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax		(11,586)	(5,358)	[1]
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), before Tax		(1,429)	(4,337)
Deferred tax expense (benefit)		(537)	(1,673)
Accumulated other comprehensive income (loss), net of tax	[2]	(892)	(2,664)		$ (4,434)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	$ 0	$ 0
[1]	(Dollars in thousands) Year ended December 31, 2015Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $10,817 Securities gains (4,138) Income taxes $6,679 Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (11,376) Employee benefits (11,586) Employee benefits 4,988 Income taxes $(6,598) Net incomeTotal reclassifications for the period $81 Year ended December 31, 2014Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized 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 benefitsActuarial losses (5,148) Employee benefits (5,358) Employee benefits 2,084 Income taxes $(3,274) Net incomeTotal reclassifications for the period $14,598 (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated Other Comprehens106

Accumulated Other Comprehensive Loss (Components of AOCI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (52,981)	$ (25,268)
Other comprehensive income (loss) before reclassifications		(11,378)	(13,115)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	(81)	(14,598)
Net current period other comprehensive (loss) income		(11,459)	(27,713)	$ 56,838
Ending balance		(64,440)	(52,981)	(25,268)
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	(2,664)	(4,434)
Other comprehensive income (loss) before reclassifications	[2]	1,772	1,770
Amounts reclassified from accumulated other comprehensive (loss) income	[2]	0	0
Net current period other comprehensive (loss) income	[2]	1,772	1,770
Ending balance	[2]	(892)	(2,664)	(4,434)
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	5,098	(10,091)
Other comprehensive income (loss) before reclassifications	[2]	(13,544)	33,061
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[2]	(6,679)	(17,872)
Net current period other comprehensive (loss) income	[2]	(20,223)	15,189
Ending balance	[2]	(15,125)	5,098	(10,091)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	(55,415)	(10,743)
Other comprehensive income (loss) before reclassifications	[2]	394	(47,946)
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[2]	6,598	3,274
Net current period other comprehensive (loss) income	[2]	6,992	(44,672)
Ending balance	[2]	$ (48,423)	$ (55,415)	$ (10,743)
[1]	(Dollars in thousands) Year ended December 31, 2015Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $10,817 Securities gains (4,138) Income taxes $6,679 Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (11,376) Employee benefits (11,586) Employee benefits 4,988 Income taxes $(6,598) Net incomeTotal reclassifications for the period $81 Year ended December 31, 2014Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized 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 benefitsActuarial losses (5,148) Employee benefits (5,358) Employee benefits 2,084 Income taxes $(3,274) Net incomeTotal reclassifications for the period $14,598 (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated Other Comprehens107

Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Long-term obligations		$ 924,905	$ 710,097		$ 740,186
Securities gains (losses)		10,817	29,096		0
Income taxes		(122,028)	(65,032)		$ (101,574)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	(81)	(14,598)
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	[2]	0	0
Unrealized Gains on Investment Securities Available for Sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	[1]	10,817	29,096
Income taxes	[1]	(4,138)	(11,224)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1],[2]	(6,679)	(17,872)
Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Employee Benefits, prior service costs	[1]	(210)	(210)
Reclassification adjustment for losses included in income before income taxes	[1]	(11,376)	(5,148)
Total before taxes		(11,586)	(5,358)	[1]
Income taxes	[1]	4,988	2,084
Amounts reclassified from accumulated other comprehensive income, net of tax	[1],[2]	$ 6,598	$ 3,274
[1]	(Dollars in thousands) Year ended December 31, 2015Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $10,817 Securities gains (4,138) Income taxes $6,679 Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (11,376) Employee benefits (11,586) Employee benefits 4,988 Income taxes $(6,598) Net incomeTotal reclassifications for the period $81 Year ended December 31, 2014Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized 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 benefitsActuarial losses (5,148) Employee benefits (5,358) Employee benefits 2,084 Income taxes $(3,274) Net incomeTotal reclassifications for the period $14,598 (1) Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Parent Company Financial Sta108

Parent Company Financial Statements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Investment securities	$ 6,861,293,000	$ 7,171,917,000
Other assets	417,391,000	394,027,000
Total assets	31,475,934,000	30,075,113,000
Liabilities and Shareholders' Equity
Short-term borrowings	594,733,000	987,184,000
Long-term obligations	704,155,000	351,320,000
Other liabilities	247,729,000	253,903,000
Stockholders' equity	2,872,109,000	2,687,594,000	$ 2,071,462,000	$ 1,859,624,000
Total liabilities and shareholders' equity	31,475,934,000	30,075,113,000
Income Statement [Abstract]
Interest expense	44,304,000	50,351,000	56,618,000
Net interest income (loss)	924,905,000	710,097,000	740,186,000
Income tax benefit	122,028,000	65,032,000	101,574,000
Net income	210,386,000	138,562,000	166,869,000
OPERATING ACTIVITIES
Net income	210,386,000	138,562,000	166,869,000
Net amortization of premiums and accretion of discounts	(85,066,000)	(48,374,000)	(112,759,000)
Gain on elimination of acquired debt	0	(1,988,000)	0
Securities (gains) losses	(10,817,000)	(29,096,000)	0
Gain on sale of other assets	0	0	(4,085,000)
Other than temporary impairment on securities	0
Change in other assets	(12,904,000)	(72,680,000)	100,437,000
Change in other liabilities	14,458,000	1,319,000	49,177,000
INVESTING ACTIVITIES
Net change in short-term borrowings	(397,952,000)	(25,321,000)	(57,087,000)
Retirement of long-term obligations	(5,896,000)	(54,301,000)	(4,152,000)
Stock issuance costs	0	(619,000)	0
Repurchase of common stock	0	0	(321,000)
Cash dividends paid	(18,015,000)	(11,543,000)	(8,663,000)
Net change in cash	(70,096,000)	70,583,000	(106,131,000)
Cash and due from banks at beginning of period	604,182,000	533,599,000	639,730,000
Cash and due from banks at end of period	534,086,000	604,182,000	533,599,000
Cash payments for
Interest	46,785,000	48,894,000	59,234,000
Income taxes	136,900,000	127,970,000	102,890,000
Parent
Assets
Cash	26,285,000	24,026,000
Investment securities	21,137,000	110,644,000
Investment in Banking Subsidiaries	2,874,581,000	2,750,201,000
Investment in Other Subsidiaries	43,117,000	65,665,000
Due from subsidiaries	0	295,994,000
Other assets	73,944,000	74,157,000
Total assets	3,039,064,000	3,320,687,000
Liabilities and Shareholders' Equity
Short-term borrowings	0	485,207,000
Long-term obligations	133,775,000	136,717,000
Due to Affiliate	29,682,000	0
Other liabilities	3,498,000	11,169,000
Stockholders' equity	2,872,109,000	2,687,594,000
Total liabilities and shareholders' equity	3,039,064,000	3,320,687,000
Income Statement [Abstract]
Interest income	645,000	1,784,000	1,387,000
Interest expense	6,793,000	9,694,000	7,065,000
Net interest income (loss)	(6,148,000)	(7,910,000)	(5,678,000)
Dividend Income, Banking Subsidiaries	75,006,000	82,419,000	131,006,000
Dividends from subsidiaries	23,500,000	0	0
Other income (loss)	1,870,000	33,600,000	3,620,000
Other operating expense	2,634,000	6,534,000	2,344,000
Income before income tax benefit and equity in undistributed net income of subsidiaries	91,594,000	101,575,000	126,604,000
Income tax benefit	(2,618,000)	(2,590,000)	(2,095,000)
Income before equity in undistributed net income of subsidiaries	94,212,000	104,165,000	128,699,000
Excess distributions (undistributed ) net income of subsidiaries	(116,174,000)	(34,397,000)	(38,170,000)
Net income	210,386,000	138,562,000	166,869,000
OPERATING ACTIVITIES
Net income	210,386,000	138,562,000	166,869,000
Excess distributions (undistributed ) net income of subsidiaries	(116,174,000)	(34,397,000)	(38,170,000)
Net amortization of premiums and accretion of discounts	(2,712,000)	594,000	334,000
Gain on elimination of acquired debt	0	(1,988,000)	0
Securities (gains) losses	(236,000)	(29,126,000)	0
Gain on sale of other assets	0	0	(1,331,000)
Change in other assets	(3,070,000)	93,385,000	(61,704,000)
Change in other liabilities	(1,157,000)	2,250,000	(2,096,000)
Net cash provided by (Used in) Operating Activities	87,037,000	169,280,000	63,902,000
INVESTING ACTIVITIES
Net change in due from subsidiaries	295,994,000	(150,328,000)	(67,154,000)
Purchases of investment securities	(7,818,000)	(33,243,000)	(126,197,000)
Maturities and sales of investment securities	100,586,000	114,208,000	135,000,000
Investment in subsidiaries	0	1,579,000	1,489,000
Business acquisitions, net of cash acquired	0	(24,772,000)	0
Net Cash Provided by (Used in) Investing Activities	388,762,000	(92,556,000)	(56,862,000)
Change in Due to Subsidiaries	29,682,000	0	0
Net change in short-term borrowings	(485,207,000)	(1,211,000)	12,860,000
Retirement of long-term obligations	0	(52,372,000)	0
Stock issuance costs	0	(619,000)	0
Repurchase of common stock	0	0	(321,000)
Cash dividends paid	(18,015,000)	(11,543,000)	(8,663,000)
Net cash used by financing activities	(473,540,000)	(65,745,000)	3,876,000
Net change in cash	2,259,000	10,979,000	10,916,000
Cash and due from banks at beginning of period	24,026,000	13,047,000	2,131,000
Cash and due from banks at end of period	$ 26,285,000	$ 24,026,000	$ 13,047,000