First Citizens BancShares (FCNCO) 10-K 22 Feb 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 21, 2017	Jun. 30, 2016
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, 2016
Document Fiscal Year Focus	2,016
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			$ 1,900,169,651
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, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 539,741	$ 534,086
Overnight investments	1,872,594	2,063,132
Investment securities available for sale	7,006,580	6,861,293
Investment securities held to maturity	98	255
Loans Receivable Held-for-sale, Amount	74,401	59,766
Loans and leases:
Purchased credit-impaired (PCI)	809,169	950,516
Non-PCI	20,928,709	19,289,474
Less allowance for loan and lease losses	(218,795)	(206,216)
Net Loans and Leases	21,519,083	20,033,774
Loans and Leases Receivable, Gross	21,737,878	20,239,990
Premises and equipment	1,133,044	1,135,829
Other Real Estate	61,231	65,559
Other real estate owned:
Other Real Estate, Covered	472	6,817
Other Real Estate, Non Covered	60,759	58,742
Income earned not collected	79,839	70,036
FDIC loss share receivable	4,172	4,054
Goodwill	150,601	139,773
Intangible Assets, Net (Excluding Goodwill)	78,040	90,986
Other assets	471,412	417,391
Total assets	32,990,836	31,475,934
Liabilities
Noninterest-bearing	10,130,549	9,274,470
Interest-bearing	18,030,794	17,656,285
Total deposits	28,161,343	26,930,755
Debt, Current	603,487	594,733
Long-term obligations	832,942	704,155
FDIC shared-loss payable	97,008	126,453
Other liabilities	283,629	247,729
Total liabilities	29,978,409	28,603,825
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,476,691	2,265,621
Accumulated other comprehensive loss	(135,192)	(64,440)
Total shareholders' equity	3,012,427	2,872,109
Total liabilities and shareholders' equity	32,990,836	31,475,934
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, 2016	Dec. 31, 2015
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Available-for-sale Securities, Amortized Cost Basis	$ 7,079,287	$ 6,885,797
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	$ 5,259,466	$ 4,692,447
Held-to-maturity Securities, Fair Value	$ 104	$ 265

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Loans and leases	$ 876,472	$ 874,892	$ 700,525
Investment securities:
U. S. Treasury	11,837	15,353	11,656
Government agency	2,883	6,843	7,410
Residential mortgage-backed securities	79,336	65,815	36,492
Corporate bonds	1,783	0	255
State, county and municipal	1	33	13
Other	911	206	385
Total investment securities interest and dividend income	96,751	88,250	56,211
Overnight investments	14,534	6,067	3,712
Total interest income	987,757	969,209	760,448
Interest expense
Deposits	18,169	21,230	24,786
Short-term borrowings	1,965	4,660	9,177
Long-term obligations	22,948	18,414	16,388
Total interest expense	43,082	44,304	50,351
Net interest income (loss)	944,675	924,905	710,097
Provision for loan and lease losses	32,941	20,664	640
Net interest income after provision for loan and lease losses	911,734	904,241	709,457
Noninterest income
Gain on acquisitions	5,831	42,930	0
Cardholder services	83,417	77,342	59,607
Merchant services	95,774	84,207	64,075
Service charges on deposit accounts	89,359	90,546	69,100
Wealth management services	80,221	82,865	66,115
Fees from processing services	71	180	17,989
Securities gains (losses)	26,673	10,817	29,096
Other service charges and fees	26,940	23,807	17,760
Mortgage income	20,348	18,168	5,828
Insurance commissions	11,150	11,757	11,129
ATM income	7,283	7,119	5,388
Adjustments to FDIC receivable	(9,725)	(19,009)	(32,151)
Net impact from FDIC shared-loss termination	16,559	0	0
Other	34,170	36,359	29,277
Total noninterest income	488,071	467,088	343,213
Noninterest expense
Salaries and wages	428,351	429,742	349,279
Employee benefits	104,518	113,309	79,898
Occupancy expense	102,609	98,191	86,775
Equipment expense	92,501	92,639	79,084
Merchant processing	65,440	58,231	42,661
Cardholder processing	24,474	21,735	15,133
FDIC insurance expense	20,967	18,340	12,979
Foreclosure-related expenses	4,490	2,662	17,368
Merger-related expenses	5,341	14,174	13,064
Other	200,047	189,892	152,835
Total noninterest expense	1,048,738	1,038,915	849,076
Income before income taxes	351,067	332,414	203,594
Income taxes	125,585	122,028	65,032
Income taxes	92,439	121,478	98,371
Net income	$ 225,482	$ 210,386	$ 138,562
Average shares outstanding (in shares)	12,010,405	12,010,405	10,221,721
Cash dividends (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Net income per share	$ 18.77	$ 17.52	$ 13.56

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 225,482	$ 210,386	$ 138,562
Unrealized (losses) gains on securities:
Change in unrealized securities (losses) gains arising during period	(21,530)	(22,030)	54,071
Tax effect	7,584	8,486	(21,010)
Reclassification adjustment for net gains realized and included in income before income taxes	(26,673)	(10,817)	(29,096)
Tax effect	9,869	4,138	11,224
Total change in unrealized (losses) gains on securities, net of tax	(30,750)	(20,223)	15,189
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	1,429	2,908	2,883
Tax effect	(537)	(1,136)	(1,113)
Total change in unrecognized loss on cash flow hedges, net of tax	892	1,772	1,770
Change in pension obligation:
Change in pension obligation	(70,424)	691	(78,472)
Tax effect	25,077	(297)	30,526
Amortization of actuarial losses and prior service cost	7,069	11,586	5,358
Tax effect	(2,616)	(4,988)	(2,084)
Total change in pension obligation, net of tax	(40,894)	6,992	(44,672)
Net current period other comprehensive (loss) income	(70,752)	(11,459)	(27,713)
Total comprehensive income	$ 154,730	$ 198,927	$ 110,849

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, 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	225,482				0	0	0			225,482			0
Net current period other comprehensive income	(70,752)				0	0	0			0			(70,752)
Repurchase and retirement of common stock	0
Cash dividends	(14,412)				0	0	0			(14,412)			0
Ending balance at Dec. 31, 2016	$ 3,012,427				$ 11,005	$ 1,005	$ 658,918			$ 2,476,691			$ (135,192)

Consolidated Statements of Cha7

Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / 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, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 225,482	$ 210,386	$ 138,562
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	32,941	20,664	640
Deferred tax expense (benefit)	33,146	550	(33,339)
Change in current taxes payable	(24,380)	(19,477)	72,274
Depreciation	88,777	87,717	75,481
Change in accrued interest payable	(1,916)	(2,481)	1,457
Change in income earned not collected	(7,805)	(12,782)	6,402
Gain on acquisitions	(5,831)	(42,930)	0
Gain (Loss) on Disposition of Business	0	(216)	0
Securities losses (gains)	(26,673)	(10,817)	(29,096)
Gain (Loss) on Contract Termination	3,377	0	0
Origination of loans held for sale	(795,963)	(685,631)	(377,993)
Proceeds from sale of loans held for sale	797,123	701,412	398,719
Gain on sale of loans	(15,795)	(11,851)	(4,971)
Gain (Loss) on Sale of Loans and Leases	(3,758)	0	0
Loss on sale of other real estate	6,201	2,168	14,275
Gain on elimination of acquired debt	0	0	(1,988)
Net amortization of premiums and discounts	(44,618)	(85,066)	(48,374)
Amortization of intangible assets	21,808	22,894	6,955
FDIC receivable for loss share agreements	14,745	47,044	27,666
FDIC payable for loss share agreements	(11,245)	9,918	6,933
Net change in other assets	(27,656)	(12,904)	(72,680)
Net change in other liabilities	(25,520)	14,458	1,319
Net cash provided by operating activities	232,440	233,056	182,242
INVESTING ACTIVITIES
Net change in loans outstanding	(1,214,433)	(1,311,447)	(814,372)
Purchases of investment securities available for sale	(4,086,855)	(2,467,993)	(2,518,680)
Proceeds from maturities of investment securities held to maturity	157	263	389
Proceeds from maturities of investment securities available for sale	2,149,130	1,478,608	2,482,722
Proceeds from sales of investment securities available for sale	1,829,305	1,286,120	422,652
Net change in overnight investments	233,433	(338,213)	221,730
Cash (paid to) received from the FDIC for loss share agreements	(21,059)	(33,296)	(1,286)
Net Payment to the FDIC for Termination of Loss Share Agreements	(20,115)	0	0
Proceeds from Sale of Other Real Estate	34,944	80,932	89,485
Proceeds from Sale of Loans Held-for-investment	77,665	45,862	0
Additions to premises and equipment	(81,841)	(89,734)	(82,708)
Net Cash Used in Divestiture of Businesses	0	(22,242)	0
Business acquisitions, net of cash acquired	(727)	123,137	182,370
Net cash (used) provided by investing activities	(1,100,396)	(1,248,003)	(17,698)
FINANCING ACTIVITIES
Net change in time deposits	(505,548)	(590,773)	(499,869)
Net change in demand and other interest-bearing deposits	1,287,856	1,607,487	497,692
Net change in short-term borrowings	(33,072)	(397,952)	(25,321)
Repayment of long-term obligations	(11,213)	(5,896)	(54,301)
Origination of long-term obligations	150,000	350,000	0
Stock issuance costs	0	0	(619)
Cash dividends paid	(14,412)	(18,015)	(11,543)
Net cash provided (used) by financing activities	873,611	944,851	(93,961)
Change in cash and due from banks	5,655	(70,096)	70,583
Cash and due from banks at beginning of period	534,086	604,182	533,599
Cash and due from banks at end of period	539,741	534,086	604,182
CASH PAYMENTS FOR:
Interest	44,998	46,785	48,894
Income taxes	108,741	136,900	127,970
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	35,272	55,032	65,956
Dividends declared but not paid	0	0	3,603
Repurchase and retirement of common stock	0	0	(46,085)
Issuance of common stock associated with Bancorporation merger	$ 0	$ 0	$ 564,248

Accounting Policies and Basis o

Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2016
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 September 1, 2016, First Citizens Bank completed the merger of Midlothian, Virginia-based Cordia Bancorp, Inc. (Cordia) and its subsidiary, Bank of Virginia (BVA) into FCB. Under the terms of the merger agreement, cash consideration of $5.15 was paid to Cordia’s shareholders for each of their shares of Cordia’s common stock, with total consideration paid of $37.1 million . On June 14, 2016, FCB terminated five of FCB's nine shared-loss agreements with the Federal Deposit Insurance Corporation (FDIC), including Temecula Valley Bank (TVB), Sun American Bank (SAB), Williamsburg First National Bank (WFNB), Atlantic Bank & Trust (ABT) and Colorado Capital Bank (CCB). The resulting positive net impact to pre-tax earnings from the early termination of the FDIC shared-loss agreements was $16.6 million during 2016. See Note H for additional information regarding the FDIC shared-loss termination. On May 6, 2016, FCB purchased certain assets and assumed certain liabilities of First CornerStone Bank (FCSB) of King of Prussia, Pennsylvania from the FDIC. On March 11, 2016, FCB purchased certain assets and assumed certain liabilities of North Milwaukee State Bank (NMSB) of Milwaukee, Wisconsin from the FDIC. On February 13, 2015, FCB purchased certain assets and assumed certain liabilities of Capitol City Bank & Trust (CCBT) of Atlanta, Georgia from the FDIC. In accordance with the acquisition method of accounting, all assets and liabilities were recorded at their fair value as of the acquisition date. 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 Business Combinations. Nature of Operations FCB operates 550 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma, Kansas, Pennsylvania, Wisconsin and New Jersey. 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), title insurance is offered through Neuse Financial Services, Inc., and investment advisory services are provided through First Citizens Asset Management, Inc. (FCAM). First Citizens Securities Corporation merged into FCIS effective January 1, 2016. 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. 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 without additional subordinated financial support, 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 the 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; • Goodwill and other intangible assets; • FDIC shared-loss receivable and payable; and • 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, 2016 and 2015 , 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. Non-marketable 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. Non-marketable 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. Non-marketable securities are recorded within other assets in the Consolidated Balance Sheets. FHLB and non-marketable securities were $43.8 million and $37.7 million at December 31, 2016 and 2015 , respectively. Investments in Qualified Affordable Housing Projects BancShares and FCB have investments in certain partnerships and limited liability entities primarily for the purposes of fulfilling Community Reinvestment Act requirements and obtaining tax credits and accounts for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the income statement as a component of income tax expense. All of the investments held in qualified affordable housing projects qualify for the proportional amortization method and were $109.8 million and $85.6 million at December 31, 2016 and December 31, 2015 , respectively, and are included in other assets on the Consolidated Balance Sheets. Loans Held For Sale BancShares elected to apply the fair value option for new originations of prime residential mortgage loans to be sold. BancShares elected the fair value option 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 $6.7 million and $16.6 million at December 31, 2016 and 2015 , 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 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. PCI loans 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 reflect credit deterioration since origination such that it is probable at acquisition that BancShares will be unable to collect all contractually required payments. At 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. 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, BancShares continues to estimate cash flows expected to be collected on individual loans or on 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 determined using the effective interest rates has decreased and if so, recognizes provision for loan and lease losses in the 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, accretion income is recognized except for situations when the timing and amount of future cash flows cannot be determined. PCI loans with uncertain future cash flows are accounted for under the cost recovery method and those loans are generally reported as nonaccrual. For PCI loans 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. Loans that have been restructured as a TDR are treated and reported as such for the remaining life of the loan. 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 and leases. 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. 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, including TDRs, are generally removed from nonaccrual status when they become current as to both principal and interest, the borrower has demonstrated a sustained period of repayment performance for a reasonable period, generally a minimum of six months, 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). NRV 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 at least annual periodic revaluations of the underlying collateral. 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 also recorded in foreclosure-related expense. Covered Assets and Receivable from FDIC for Shared-Loss Agreements Assets subject to shared-loss agreements with the FDIC include certain loans and leases and OREO. These shared-loss 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 shared-loss 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 shared-loss 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 shared-loss 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 shared-loss 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 shared-loss agreements. Upon evaluation of certain characteristics, circumstances, nature and remaining term associated with and balance of indemnification assets, management may determine different subsequent accounting treatment to be appropriate. Collection and other servicing costs related to loans covered under FDIC shared-loss 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 (SBA) 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 Shared-Loss 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 shared-loss 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 shared-loss payable. The ultimate settlement amount of the payment is dependent upon the performance of the underlying covered loans, recoveries, 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 historical net 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, certain loan loss factors related to the quantitative component of the ALLL and reserve factors related to the qualitative component of the ALLL were updated in 2016. This methodology update resulted in no material net impact to the ALLL. 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. 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 o

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2016
Business Acquisition [Line Items]
Business Combinations	BUSINESS COMBINATIONS Cordia Bancorp, Inc. On September 1, 2016, FCB completed the merger of Cordia and its subsidiary, BVA, into FCB. Under the terms of the merger agreement, cash consideration of $5.15 was paid to Cordia’s shareholders for each of their shares of Cordia’s common stock, with total consideration paid of $37.1 million . The merger allowed FCB to strengthen its presence in the greater Richmond, Virginia area as Cordia operated six BVA branches in Richmond, Midlothian, Chesterfield, Colonial Heights and Chester, Virginia. The Cordia 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 assets acquired was $349.3 million , including $241.4 million in loans and $2.2 million of identifiable intangible assets. Liabilities assumed were $323.1 million , including $292.2 million in deposits. As a result of the transaction, FCB recorded $10.8 million of goodwill. The amount of goodwill recorded represents the excess purchase price over the estimated fair value of the net assets acquired. This premium paid reflects the increased market share and related synergies that are expected to result from the acquisition. None of the goodwill is deductible for income tax purposes as the merger is accounted for as a qualified stock purchase. 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) As recorded by FCB Purchase price $ 37,053 Assets Cash and due from banks $ 8,383 Overnight investments 3,081 Investment securities available for sale 76,633 Loans and leases 241,392 Premises and equipment 4,151 Other real estate owned 1,170 Income earned not collected 1,990 Intangible assets 2,210 Other assets 10,318 Total assets acquired 349,328 Liabilities Deposits 292,192 Short-term borrowings 30,164 Other liabilities 747 Total liabilities assumed $ 323,103 Fair value of net assets acquired 26,225 Goodwill recorded for Cordia $ 10,828 Merger-related expenses of $3.8 million were recorded in the Consolidated Statements of Income for the year ended December 31, 2016 . Loan-related interest income generated from Cordia was approximately $4.2 million since the acquisition date for the year ended December 31, 2016 . The transaction is not considered material to BancShares' financial statements and therefore pro forma financial data is not included. Due to the immaterial amount of loans resulting from the Cordia transaction that had evidence of credit quality deterioration, all loans were accounted for as non-PCI loans under ASC 310-20. First CornerStone Bank On May 6, 2016, FCB entered into an agreement with the FDIC, as Receiver, to purchase certain assets and assume certain liabilities of FCSB of King of Prussia, Pennsylvania. The acquisition provided FCB the opportunity to grow capital and enhance earnings. The FCSB 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 $87.4 million , including $43.8 million in loans and $390 thousand of identifiable intangible assets. Liabilities assumed were $96.9 million of which the majority were deposits. During the third quarter of 2016, adjustments were made to the acquisition fair values primarily based upon updated collateral valuations resulting in an increase of $837 thousand to the gain on acquisition. These adjustments brought the total gain on the transaction to $3.0 million which is included in noninterest income in the Consolidated Statements of Income. 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 due from banks $ 748 Overnight investments 37,540 Investment securities 4,564 Loans 43,776 Other real estate owned 375 Income earned not collected 8 Intangible assets 390 Other assets 13 Total assets acquired 87,414 Liabilities Deposits 96,882 Other liabilities 23 Total liabilities assumed 96,905 Fair value of net liabilities assumed (9,491 ) Cash received from FDIC 12,450 Gain on acquisition of FCSB $ 2,959 Merger-related expenses of $1.0 million were recorded in the Consolidated Statement of Income for the year ended December 31, 2016 . Loan-related interest income generated from FCSB was approximately $1.6 million since the acquisition date for the year ended December 31, 2016 . The transaction is not considered material to BancShares' financial statements and therefore pro forma financial data is not included. All loans resulting from the FCSB 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. North Milwaukee State Bank On March 11, 2016, FCB entered into an agreement with the FDIC, as Receiver, to purchase certain assets and assume certain liabilities of NMSB with two branches in Milwaukee, Wisconsin. The acquisition provided FCB with the opportunity to grow capital and enhance earnings. The NMSB 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 $53.6 million , including $36.9 million in loans and $240 thousand of identifiable intangible assets. Liabilities assumed were $60.9 million of which $59.2 million were deposits. During the second quarter of 2016, adjustments were made to the acquisition fair values primarily based upon updated collateral valuations resulting in an increase of $1.2 million to the gain on acquisition. These adjustments brought the total gain on the transaction to $2.9 million which is included in noninterest income in the Consolidated Statements of Income. 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 due from banks $ 4,545 Overnight investments 2,274 Investment securities available for sale 9,425 Loans 36,914 Other intangible assets 240 Other assets 216 Total assets acquired 53,614 Liabilities Deposits 59,206 Short-term borrowings 1,662 Other liabilities 74 Total liabilities assumed 60,942 Fair value of net liabilities assumed (7,328 ) Cash received from FDIC 10,200 Gain on acquisition of NMSB $ 2,872 Merger-related expenses of $517 thousand from the NMSB transaction were recorded in the Consolidated Statements of Income for the year ended December 31, 2016 . Loan-related interest income generated from NMSB was approximately $1.9 million since the acquisition date for the year ended December 31, 2016 . The transaction is not considered material to BancShares' financial statements and therefore pro forma financial data is not included. All loans resulting from the NMSB 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. 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 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. These fair values were subject to refinement for up to one year after the closing date of the acquisition. The measurement period ended on February 12, 2016. 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. The fair value of the net liabilities assumed was $60.6 million and cash received from the FDIC was $103.5 million . The total gain on the transaction was $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 . 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. The transaction is not considered material to BancShares' financial statements and therefore pro forma financial data is not included. 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.

Investments

Investments	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , were as follows: December 31, 2016 (Dollars in thousands) Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities available for sale U.S. Treasury $ 1,650,675 $ 579 $ 935 $ 1,650,319 Government agency 40,291 107 — 40,398 Mortgage-backed securities 5,259,466 2,809 86,850 5,175,425 Equity securities 71,873 11,634 — 83,507 Corporate bonds 49,367 195 — 49,562 Other 7,615 — 246 7,369 Total investment securities available for sale $ 7,079,287 $ 15,324 $ 88,031 $ 7,006,580 December 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value 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 Corporate bonds 8,500 — — 8,500 Other 2,115 45 — 2,160 Total investment securities available for sale $ 6,885,797 $ 6,367 $ 30,871 $ 6,861,293 December 31, 2016 Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities held to maturity Mortgage-backed securities $ 98 $ 6 $ — $ 104 December 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities $ 255 $ 10 $ — $ 265 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. Investments in equity securities and corporate bonds represent positions in securities of other financial institutions. 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, 2016 December 31, 2015 (Dollars in thousands) Cost Fair value Cost Fair value Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 842,798 $ 842,947 $ 1,255,714 $ 1,255,094 One through five years 848,168 847,770 919,086 918,448 Five through 10 years 49,367 49,562 8,500 8,500 Over 10 years 7,615 7,369 2,115 2,160 Mortgage-backed securities 5,259,466 5,175,425 4,692,447 4,668,198 Equity securities 71,873 83,507 7,935 8,893 Total investment securities available for sale $ 7,079,287 $ 7,006,580 $ 6,885,797 $ 6,861,293 Investment securities held to maturity Mortgage-backed securities held to maturity $ 98 $ 104 $ 255 $ 265 For each period presented, securities gains (losses) include the following: Year ended December 31 (Dollars in thousands) 2016 2015 2014 Gross gains on retirement/sales of investment securities available for sale $ 27,104 $ 10,834 $ 29,129 Gross losses on sales of investment securities available for sale (431 ) (17 ) (33 ) Total securities gains $ 26,673 $ 10,817 $ 29,096 The following table provides information regarding securities with unrealized losses as of December 31, 2016 and 2015 : December 31, 2016 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 $ 807,822 $ 935 $ — $ — $ 807,822 $ 935 Mortgage-backed securities 4,442,700 82,161 362,351 4,689 4,805,051 86,850 Other 7,369 246 — — 7,369 246 Total $ 5,257,891 $ 83,342 $ 362,351 $ 4,689 $ 5,620,242 $ 88,031 December 31, 2015 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 $ 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 Total $ 5,340,271 $ 24,777 $ 280,126 $ 6,094 $ 5,620,397 $ 30,871 Investment securities with an aggregate fair value of $362.4 million have had continuous unrealized losses for more than 12 months as of December 31, 2016 with an aggregate unrealized loss of $4.7 million . As of December 31, 2016 , all 51 of these investments are government sponsored enterprise-issued mortgage-backed securities. None of the unrealized losses identified as of December 31, 2016 or December 31, 2015 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 $4.55 billion at December 31, 2016 and $4.73 billion at December 31, 2015 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, 2016
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 non-impaired loans and certain purchased revolving credit. For purchased non-impaired loans to be included as non-PCI, it must be determined that the loans do not have a discount 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 . See Note A for additional information on PCI and non-PCI loans and leases. 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 dwelling at a future date. Consumer – Consumer loans consist of installment loans to finance purchases of vehicles, unsecured home improvements, student loans and revolving lines of credit that can be secured or unsecured, including personal credit cards. Loans and leases outstanding include the following at December 31, 2016 and 2015 : (Dollars in thousands) December 31, 2016 December 31, 2015 Non-PCI loans and leases: Commercial: Construction and land development $ 649,157 $ 620,352 Commercial mortgage 9,026,220 8,274,548 Other commercial real estate 351,291 321,021 Commercial and industrial 2,567,501 2,368,958 Lease financing 826,270 730,778 Other 340,264 314,832 Total commercial loans 13,760,703 12,630,489 Noncommercial: Residential mortgage 2,889,124 2,695,985 Revolving mortgage 2,601,344 2,523,106 Construction and land development 231,400 220,073 Consumer 1,446,138 1,219,821 Total noncommercial loans 7,168,006 6,658,985 Total non-PCI loans and leases 20,928,709 19,289,474 PCI loans: Commercial: Construction and land development 20,766 33,880 Commercial mortgage 453,013 525,468 Other commercial real estate 12,645 17,076 Commercial and industrial 11,844 15,182 Other 1,702 2,008 Total commercial loans 499,970 593,614 Noncommercial: Residential mortgage 268,777 302,158 Revolving mortgage 38,650 52,471 Consumer 1,772 2,273 Total noncommercial loans 309,199 356,902 Total PCI loans 809,169 950,516 Total loans and leases $ 21,737,878 $ 20,239,990 At December 31, 2016 , $84.8 million in total loans were covered under shared-loss agreements, compared to $272.6 million at December 31, 2015 . The decline was primarily due to the expiration and termination of certain shared-loss agreements during the year. At December 31, 2016 , $8.26 billion in noncovered loans with a lendable collateral value of $5.50 billion were used to secure $660.2 million in FHLB of Atlanta advances, resulting in additional borrowing capacity of $4.84 billion . 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 additional borrowing capacity of $5.57 billion . To mitigate interest rate risk and credit risk, we sold residential mortgage loans not originated for sale totaling $77.7 million in 2016 , resulting in a gain of $3.8 million . We sold residential mortgage not originated for sale totaling $45.9 million at par in 2015 . The unamortized discount related to purchased non-PCI loans and leases acquired in the Cordia transaction was $4.2 million at December 31, 2016 . The unamortized discount related to purchased non-PCI loans and leases acquired in the First Citizens Bancorporation, Inc. (Bancorporation) merger was $27.4 million and $41.1 million at December 31, 2016 and December 31, 2015 , respectively. During the years ended December 31, 2016 and December 31, 2015 , accretion income on non-PCI loans and leases was $14.3 million and $18.7 million , respectively. Loans and leases to borrowers in medical, dental or related fields were $4.66 billion as of December 31, 2016 , which represents 21.5 percent of total loans and leases, compared to $4.28 billion or 21.2 percent of total loans and leases at December 31, 2015 . The credit risk of this industry concentration is mitigated through our underwriting policies that emphasize reliance on adequate borrower cash flow rather than underlying collateral value and our preference for financing secured by owner-occupied real property. Except for this single concentration, no other industry represented more than 10 percent of total loans and leases outstanding at December 31, 2016 . 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, 2016 and December 31, 2015 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, lease financing and other commercial real estate loans. The composition of the loans and leases outstanding at December 31, 2016 , and December 31, 2015 , by credit quality indicator is provided below: December 31, 2016 (Dollars in thousands) Non-PCI commercial loans and leases Grade: Construction and land Commercial Other Commercial and Lease financing Other Total non-PCI commercial loans and leases Pass $ 645,232 $ 8,821,439 $ 347,509 $ 2,402,659 $ 818,008 $ 335,831 $ 13,370,678 Special mention 2,236 76,084 1,433 22,804 2,675 1,020 106,252 Substandard 1,683 126,863 2,349 17,870 5,415 3,413 157,593 Doubtful 6 334 — 8 — — 348 Ungraded — 1,500 — 124,160 172 — 125,832 Total $ 649,157 $ 9,026,220 $ 351,291 $ 2,567,501 $ 826,270 $ 340,264 $ 13,760,703 December 31, 2015 Non-PCI commercial loans and leases Construction and land Commercial Other Commercial and Lease financing Other Total non-PCI commercial loans and leases 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, 2016 Non-PCI noncommercial loans and leases (Dollars in thousands) Residential Revolving Construction Consumer Total non-PCI noncommercial Current $ 2,839,045 $ 2,576,942 $ 229,106 $ 1,434,658 $ 7,079,751 30-59 days past due 27,760 14,290 1,139 6,775 49,964 60-89 days past due 7,039 2,698 598 2,779 13,114 90 days or greater past due 15,280 7,414 557 1,926 25,177 Total $ 2,889,124 $ 2,601,344 $ 231,400 $ 1,446,138 $ 7,168,006 December 31, 2015 Non-PCI noncommercial loans and leases Residential Revolving Construction Consumer Total non-PCI noncommercial 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, 2016 (Dollars in thousands) PCI commercial loans Grade: Construction Commercial Other Commercial Other Total PCI commercial Pass $ 8,103 $ 234,023 $ 8,744 $ 7,253 $ 696 $ 258,819 Special mention 950 67,848 102 620 — 69,520 Substandard 7,850 138,312 3,462 3,648 1,006 154,278 Doubtful 3,863 12,830 337 303 — 17,333 Ungraded — — — 20 — 20 Total $ 20,766 $ 453,013 $ 12,645 $ 11,844 $ 1,702 $ 499,970 December 31, 2015 PCI commercial loans Construction Commercial Other Commercial Other Total PCI commercial 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, 2016 PCI noncommercial loans (Dollars in thousands) Residential Revolving Consumer Total PCI noncommercial Current $ 230,065 $ 33,827 $ 1,637 $ 265,529 30-59 days past due 9,595 618 68 10,281 60-89 days past due 6,528 268 4 6,800 90 days or greater past due 22,589 3,937 63 26,589 Total $ 268,777 $ 38,650 $ 1,772 $ 309,199 December 31, 2015 PCI noncommercial loans Residential Revolving Consumer Total PCI noncommercial 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 The aging of the outstanding non-PCI loans and leases, by class, at December 31, 2016 , and December 31, 2015 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, 2016 (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 $ 1,845 $ 39 $ 286 $ 2,170 $ 646,987 $ 649,157 Commercial mortgage 11,592 2,773 10,329 24,694 9,001,526 9,026,220 Other commercial real estate 310 — — 310 350,981 351,291 Commercial and industrial 7,918 2,102 1,051 11,071 2,556,430 2,567,501 Lease financing 1,175 444 863 2,482 823,788 826,270 Residential mortgage 27,760 7,039 15,280 50,079 2,839,045 2,889,124 Revolving mortgage 14,290 2,698 7,414 24,402 2,576,942 2,601,344 Construction and land development - noncommercial 1,139 598 557 2,294 229,106 231,400 Consumer 6,775 2,779 1,926 11,480 1,434,658 1,446,138 Other 72 — 198 270 339,994 340,264 Total non-PCI loans and leases $ 72,876 $ 18,472 $ 37,904 $ 129,252 $ 20,799,457 $ 20,928,709 December 31, 2015 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 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, 2016 and December 31, 2015 for non-PCI loans, were as follows: December 31, 2016 December 31, 2015 (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 $ 606 $ — $ 425 $ 273 Commercial mortgage 26,527 482 42,116 242 Other commercial real estate 86 — 239 — Commercial and industrial 4,275 440 6,235 953 Lease financing 359 683 389 — Residential mortgage 32,470 37 29,977 838 Revolving mortgage 14,308 — 12,704 — Construction and land development - noncommercial 1,121 — 2,164 — Consumer 2,236 1,076 1,472 1,007 Other 319 — 133 2 Total non-PCI loans and leases $ 82,307 $ 2,718 $ 95,854 $ 3,315 Purchased credit-impaired (PCI) loans The following table relates to PCI loans acquired in the NMSB and FCSB acquisitions for 2016 and the CCBT acquisition for 2015. 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 acquisition dates. (Dollars in thousands) 2016 2015 Contractually required payments $ 108,649 $ 247,812 Cash flows expected to be collected $ 93,178 $ 207,688 Fair value of loans at acquisition $ 80,690 $ 154,496 The recorded fair values of PCI loans acquired in the NMSB, FCSB and CCBT transactions as of their respective acquisition date were as follows: (Dollars in thousands) 2016 2015 Commercial: Construction and land development $ 684 $ 4,116 Commercial mortgage 50,372 129,732 Other commercial real estate 2,629 3,202 Commercial and industrial 3,630 2,844 Other 1,619 — Total commercial loans 58,934 139,894 Noncommercial: Residential mortgage 18,934 13,251 Revolving mortgage 1,238 — Construction and land development 340 — Consumer 1,244 1,351 Total noncommercial loans 21,756 14,602 Total PCI loans $ 80,690 $ 154,496 The following table provides changes in the carrying value of PCI loans during the years ended December 31, 2016 and 2015 : (Dollars in thousands) 2016 2015 Balance at January 1 $ 950,516 $ 1,186,498 Fair value of PCI loans acquired during the year 80,690 154,496 Accretion 76,565 114,580 Payments received and other changes, net (298,602 ) (505,058 ) Balance at December 31 $ 809,169 $ 950,516 Unpaid principal balance at December 31 $ 1,266,395 $ 1,693,372 The carrying value of loans on the cost recovery method was $498 thousand at December 31, 2016 , and $5.3 million at December 31, 2015 . 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 $3.5 million and $7.6 million at December 31, 2016 and December 31, 2015 , respectively. For PCI loans, improved credit loss expectations generally result in the reclassification of nonaccretable difference to accretable yield. Changes in expected cash flows not related to credit improvements or deterioration do not affect the nonaccretable difference. The following table documents changes to the amount of accretable yield for 2016 and 2015 . (Dollars in thousands) 2016 2015 Balance at January 1 $ 343,856 $ 418,160 Additions from acquisitions 12,488 53,192 Accretion (76,565 ) (114,580 ) Reclassifications from nonaccretable difference 29,931 25,357 Changes in expected cash flows that do not affect nonaccretable difference 25,364 (38,273 ) Balance at December 31 $ 335,074 $ 343,856 Purchased non-PCI loans and leases The following table relates to purchased non-PCI loans and leases acquired in the Cordia transaction during 2016 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 acquisition date. (Dollars in thousands) 2016 Contractually required payments $ 296,529 Contractual cash flows not expected to be collected $ 2,678 Fair value at acquisition date $ 241,392 The recorded fair values of purchased non-PCI loans and leases acquired in the Cordia transaction as of the acquisition date are as follows: (Dollars in thousands) 2016 Commercial: Construction and land development $ 3,066 Commercial mortgage 77,455 Other commercial real estate 22,174 Commercial and industrial 31,773 Total commercial loans and leases 134,468 Noncommercial: Residential mortgage 16,839 Revolving mortgage 9,867 Consumer 80,218 Total noncommercial loans and leases 106,924 Total non-PCI loans $ 241,392

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2016
Receivables [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, 2016 (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 $ 1,002 $ 43 $ 1,045 $ 1,172 $ 151 Commercial mortgage 42,875 33,486 76,361 82,658 3,488 Other commercial real estate 1,279 284 1,563 1,880 152 Commercial and industrial 8,920 3,680 12,600 16,637 1,732 Lease financing 1,002 72 1,074 1,074 75 Other 142 — 142 233 23 Residential mortgage 20,269 11,207 31,476 32,588 2,447 Revolving mortgage 1,825 5,788 7,613 8,831 366 Construction and land development - noncommercial 645 1,968 2,613 3,030 109 Consumer 1,532 380 1,912 2,086 667 Total non-PCI impaired loans and leases $ 79,491 $ 56,908 $ 136,399 $ 150,189 $ 9,210 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 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, 2016 , 2015 and 2014 : Year ended December 31, 2016 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 2,700 $ 138 Commercial mortgage 82,146 2,671 Other commercial real estate 1,112 38 Commercial and industrial 11,878 417 Lease financing 1,307 63 Other 687 33 Residential mortgage 26,774 805 Revolving mortgage 6,915 171 Construction and land development - noncommercial 983 50 Consumer 1,480 80 Total non-PCI impaired loans and leases $ 135,982 $ 4,466 Year ended December 31, 2015 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

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31, 2016 and 2015 are summarized as follows: (Dollars in thousands) 2016 2015 Land $ 285,612 $ 279,932 Premises and leasehold improvements 1,130,650 1,089,644 Furniture and equipment 443,560 441,378 Total 1,859,822 1,810,954 Less accumulated depreciation and amortization 726,778 675,125 Total premises and equipment $ 1,133,044 $ 1,135,829 There were no premises pledged to secure borrowings at December 31, 2016 and 2015 . 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, 2016 : (Dollars in thousands) Year ended December 31 2017 $ 26,068 2018 22,000 2019 13,295 2020 7,081 2021 6,114 Thereafter 43,133 Total minimum payments $ 117,691 Total rent expense for all operating leases amounted to $13.0 million in 2016 , $13.8 million in 2015 and $18.5 million in 2014 , net of rent income, which was $6.5 million , $6.4 million and $2.7 million during 2016 , 2015 and 2014 , respectively.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Other Real Estate Owned	OTHER REAL ESTATE OWNED (OREO) The following table explains changes in other real estate owned during 2016 and 2015 . (Dollars in thousands) Covered Noncovered Total Balance at January 1, 2015 $ 22,982 $ 70,454 $ 93,436 Additions 7,357 47,866 55,223 Sales (19,629 ) (56,853 ) (76,482 ) Write-downs (1,478 ) (5,140 ) (6,618 ) Transfers (1) (2,415 ) 2,415 — Balance at December 31, 2015 6,817 58,742 65,559 Additions 4,888 30,384 35,272 Additions acquired in the Cordia acquisition — 1,170 1,170 Additions acquired in the FCSB acquisition — 375 375 Sales (937 ) (33,241 ) (34,178 ) Write-downs (580 ) (6,387 ) (6,967 ) Transfers (1) (9,716 ) 9,716 — Balance at December 31, 2016 $ 472 $ 60,759 $ 61,231 (1) Transfers include OREO balances associated with expired or terminated shared-loss agreements. At December 31, 2016 and December 31, 2015 , BancShares had $15.0 million and $16.1 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 $21.8 million and $15.6 million at December 31, 2016 and December 31, 2015 , respectively.

Receivable from FDIC for Loss S

Receivable from FDIC for Loss Share Agreements	12 Months Ended
	Dec. 31, 2016
FDIC Loss Share Receivable [Abstract]
Receivable from FDIC for Loss Share Agreements	FDIC SHARED-LOSS RECEIVABLE AND PAYABLE BancShares completed six FDIC-assisted transactions with shared-loss agreements during the period beginning 2009 through 2011. Prior to its merger into BancShares, First Citizens Bancorporation, Inc. (Bancorporation) completed three FDIC-assisted transactions with shared-loss agreements: Georgian Bank (acquired in 2009); Williamsburg First National Bank (acquired in 2010); and Atlantic Bank & Trust (acquired in 2011). During 2016, FCB entered into an agreement with the FDIC to terminate five of FCB's nine shared-loss agreements, including Temecula Valley Bank (TVB), Sun American Bank (SAB), Williamsburg First National Bank (WFNB), Atlantic Bank & Trust (ABT) and Colorado Capital Bank (CCB). Under the terms of the agreement, FCB made a net payment of $20.1 million to the FDIC as consideration for early termination of the shared-loss agreements . Also, FCB wrote-off $1.5 million of the FDIC shared-loss receivable and released $18.2 million of the FDIC shared-loss payable associated with the terminated agreements. As a result, FCB recognized a $3.4 million loss on the termination of the shared-loss agreements. The early termination agreement eliminated FCB's FDIC shared-loss payable for SAB and CCB. The remaining FDIC shared-loss payable balance at December 31, 2016 was $97.0 million . In conjunction with the early termination, FCB adjusted the FDIC shared-loss payable under the two remaining shared-loss agreements with clawback provisions and released other related reserves. The clawback liabilities were adjusted in order to conform to the methodology used to determine the net termination payment. The adjustment to the clawback liabilities is accounted for by management as a change in estimate. The total one-time pre-tax benefit of these adjustments was $20.0 million . The resulting positive net impact to pre-tax earnings from the early termination of the FDIC shared-loss agreements was $16.6 million during 2016. See Note U for further information related to FCB's payable to the FDIC for shared-loss agreements. As of December 31, 2016 , shared-loss protection has expired or has been terminated for all non-single family residential loans. Shared-loss protection remains only for single family residential loans acquired from UWB, VB and GB in the amount of $84.8 million . The following table provides changes in the receivable from the FDIC for the years ended December 31, 2016 , 2015 and 2014 : Year ended December 31 (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 4,054 $ 28,701 $ 93,397 Additional receivable from Bancorporation merger — — 5,106 Amortization (4,734 ) (10,899 ) (43,422 ) Net cash payments to the FDIC 21,059 33,296 1,286 Post-acquisition adjustments (14,745 ) (47,044 ) (27,666 ) Termination of FDIC shared-loss agreements (1,462 ) — — Balance at December 31 $ 4,172 $ 4,054 $ 28,701

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	DEPOSITS Deposits at December 31 are summarized as follows: (Dollars in thousands) 2016 2015 Demand $ 10,130,549 $ 9,274,470 Checking with interest 4,919,727 4,445,353 Money market accounts 8,193,392 8,205,705 Savings 2,099,579 1,909,021 Time 2,818,096 3,096,206 Total deposits $ 28,161,343 $ 26,930,755 Time deposits with a denomination of $250,000 or more were $519.7 million and $590.6 million at December 31, 2016 and 2015 , respectively. At December 31, 2016 , the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2017 $ 1,984,571 2018 435,823 2019 175,359 2020 154,294 2021 68,046 Thereafter 3 Total time deposits $ 2,818,096

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Abstract]
Short-term Borrowings	SHORT-TERM BORROWINGS Short-term borrowings at December 31 are as follows: (Dollars in thousands) 2016 2015 Repurchase agreements $ 590,772 $ 592,182 Notes payable to Federal Home Loan Banks 10,000 — Federal funds purchased 2,551 2,551 Unamortized purchase accounting adjustments 164 — Total short-term borrowings $ 603,487 $ 594,733 At December 31, 2016 , BancShares had unused credit lines allowing contingent access to overnight borrowings of up to $715.0 million on an unsecured basis. Additionally, under borrowing arrangements with the Federal Home Loan Bank of Atlanta, BancShares has access to an additional $4.84 billion on a secured basis.

Repurchase Agreements

Repurchase Agreements	12 Months Ended
	Dec. 31, 2016
Repurchase Agreements [Abstract]
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	NOTE K REPURCHASE AGREEMENTS BancShares utilizes securities sold under agreements to repurchase to facilitate the needs of our customers and secure short-term funding needs. Repurchase agreements are transactions whereby BancShares offers 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. BancShares monitors 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 segregates the security from 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 additional collateral may be required based on fair value changes of the underlying investments. Securities pledged as collateral under repurchase agreements are maintained with safekeeping agents. The carrying value of available for sale investment securities pledged as collateral under repurchase agreements was $690.8 million and $722.0 million at December 31, 2016 and December 31, 2015 , respectively. The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in the Consolidated Balance Sheets as of December 31, 2016 and December 31, 2015 is presented in the following tables. December 31, 2016 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 $ 590,772 $ — $ — $ 30,000 $ 620,772 Government agency — — — — — Total borrowings $ 590,772 $ — $ — $ 30,000 $ 620,772 Gross amount of recognized liabilities for repurchase agreements $ 620,772 December 31, 2015 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 $ 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

Long-Term Obligations

Long-Term Obligations	12 Months Ended
	Dec. 31, 2016
Long-term Obligations [Abstract]
Long-term Obligations	LONG-TERM OBLIGATIONS Long-term obligations at December 31 include: (Dollars in thousands) 2016 2015 Junior subordinated debenture at 3-month LIBOR plus 1.75 percent maturing June 30, 2036 $ 90,207 $ 96,392 Junior subordinated debenture at 3-month LIBOR plus 2.25 percent maturing June 15, 2034 24,742 25,774 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 5,701 9,226 Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through August 2024 660,237 510,252 Note payable to the Federal Home Loan Bank of Des Moines with a rate of 4.74 percent and a maturity date of July 2017 — 10,000 Unamortized purchase accounting adjustments (3,350 ) (2,907 ) Other long-term debt 30,095 30,108 Total long-term obligations $ 832,942 $ 704,155 At December 31, 2016 , long-term obligations included $125.3 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 $121.5 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, 2016 and thereafter include: Year ended December 31 2017 $ 3,232 2018 135,652 2019 241 2020 255 2021 70,271 Thereafter 623,291 Total long-term obligations $ 832,942

Estimated Fair Values

Estimated Fair Values	12 Months Ended
	Dec. 31, 2016
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 recent market transactions for identical or similar instruments are not observed. 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, corporate bonds 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. 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 junior subordinated debentures, 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. FDIC shared-loss payable. The fair value of the payable to the FDIC for shared-loss agreements is determined by the projected cash flows based on expected payments to the FDIC in accordance with the shared-loss agreements. Cash flows are discounted using current discount rates to reflect the timing of the estimated amounts due to the FDIC. The inputs used in the fair value measurement for the payable to the FDIC are considered Level 3 inputs. Interest rate swap . Under the terms of the previous cash flow hedge, BancShares paid 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 was, therefore, based on projected LIBOR rates for the duration of the hedge, values that, while observable in the market, were subject to adjustment due to pricing considerations for the specific instrument. The interest rate swap agreement expired in June 2016. The inputs used in the fair value measurement of the interest rate swap were 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, 2016 and December 31, 2015 . 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 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 shared-loss agreements is designated as Level 3. December 31, 2016 December 31, 2015 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 539,741 $ 539,741 $ 534,086 $ 534,086 Overnight investments 1,872,594 1,872,594 2,063,132 2,063,132 Investment securities available for sale 7,006,580 7,006,580 6,861,293 6,861,293 Investment securities held to maturity 98 104 255 265 Loans held for sale 74,401 74,401 59,766 59,766 Net loans and leases 21,519,083 20,614,548 20,033,774 19,353,325 Receivable from the FDIC for shared-loss agreements 4,172 4,172 4,054 4,054 Income earned not collected 79,839 79,839 70,036 70,036 Federal Home Loan Bank stock 43,495 43,495 37,511 37,511 Mortgage servicing rights 20,415 24,446 19,351 19,495 Deposits 28,161,343 28,135,698 26,930,755 26,164,472 Short-term borrowings 603,487 603,487 594,733 594,733 Long-term obligations 832,942 832,201 704,155 718,102 FDIC shared-loss payable 97,008 100,069 126,453 131,894 Accrued interest payable 3,797 3,797 5,713 5,713 Interest rate swap (1) — — 1,429 1,429 (1) The interest rate swap agreement expired in June 2016. 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, 2016 and December 31, 2015 . December 31, 2016 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 $ 1,650,319 $ — $ 1,650,319 $ — Government agency 40,398 — 40,398 — Mortgage-backed securities 5,175,425 — 5,175,425 — Equity securities 83,507 29,145 54,362 — Corporate bonds 49,562 — 49,562 — Other 7,369 — 7,369 — Total investment securities available for sale $ 7,006,580 $ 29,145 $ 6,977,435 $ — Loans held for sale $ 74,401 $ — $ 74,401 $ — December 31, 2015 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 $ 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 — Corporate bonds 8,500 — 8,500 — Other 2,160 — 2,160 — 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 $ — There were no transfers between levels during the years ended December 31, 2016 and 2015 . Fair Value Option BancShares has 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, 2016 and 2015 . December 31, 2016 (Dollars in thousands) Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 74,401 $ 75,893 $ (1,492 ) December 31, 2015 Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 59,766 $ 58,890 $ 876 No loans held for sale were 90 or more days past due or on nonaccrual status as of December 31, 2016 and 2015 . 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, 2016 and 2015 . Year ended December 31 (Dollars in thousands) 2016 2015 (Losses) gains from fair value changes on loans held for sale $ (2,368 ) $ 176 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 8 and 12 percent applied for estimated holding and selling costs and other external factors that may impact the marketability of the property. Expected cash flows are determined using expected payment information at the individual loan level, discounted using the effective interest rate. The effective interest rate generally ranges between 2 and 16 percent. OREO is measured and reported at fair value using asset valuations. Asset values are determined using appraisals or other third-party value estimates of the subject property with discounts generally between 8 and 12 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. If there are any significant changes in the market or the subject property, valuations are adjusted or new appraisals 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. For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of December 31, 2016 and December 31, 2015 . December 31, 2016 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Impaired loans $ 70,977 $ — $ — $ 70,977 Other real estate not covered under shared-loss agreements remeasured during current year 44,963 — — 44,963 Other real estate covered under shared-loss agreements remeasured during current year 439 — — 439 Mortgage servicing rights 342 — — 342 December 31, 2015 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Impaired loans $ 64,197 $ — $ — $ 64,197 Other real estate not covered under shared-loss agreements remeasured during current year 44,571 — — 44,571 Other real estate covered under shared-loss agreements remeasured during current year 4,403 — — 4,403 Mortgage servicing rights 17,997 — — 17,997 No financial liabilities were carried at fair value on a nonrecurring basis as of December 31, 2016 and December 31, 2015 .

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS FCB sponsors benefit plans for its qualifying employees and former First Citizens Bancorporation, Inc. employees (legacy Bancorporation) 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. FCB 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 highest annual compensation for five consecutive years during the last ten years of employment. Covered employees fully vested in the BancShares Plan after five years of service. FCB makes contributions to the pension plan in amounts between the minimum required for funding and the maximum amount deductible for federal income tax purposes. Discretionary contributions of $50.0 million and $30.0 million were made to the BancShares Plan during 2016 and 2015 , respectively. No contributions are anticipated for 2017. 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. FCB 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 2016 and 2015 and none are anticipated for 2017. 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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Change in benefit obligation Projected benefit obligation at January 1 $ 611,502 $ 627,645 Service cost 12,618 14,083 Interest cost 28,892 26,975 Actuarial loss (gain) 40,571 (39,002 ) Benefits paid (20,356 ) (18,199 ) Projected benefit obligation at December 31 673,227 611,502 Change in plan assets Fair value of plan assets at January 1 550,025 544,956 Actual return on plan assets 20,947 (6,732 ) Employer contributions 50,000 30,000 Benefits paid (20,356 ) (18,199 ) Fair value of plan assets at December 31 600,616 550,025 Funded status at December 31 $ (72,611 ) $ (61,477 ) The amounts recognized in the consolidated balance sheets at December 31, 2016 and 2015 consist of: (Dollars in thousands) 2016 2015 Other assets $ — $ — Other liabilities (72,611 ) (61,477 ) Net liability recognized $ (72,611 ) $ (61,477 ) The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2016 and 2015 . (Dollars in thousands) 2016 2015 Net loss $ 119,766 $ 70,358 Less prior service cost 347 556 Accumulated other comprehensive loss, excluding income taxes $ 120,113 $ 70,914 The following table provides expected amortization amounts for 2017 . (Dollars in thousands) Actuarial loss $ 8,938 Prior service cost 210 Total $ 9,148 The accumulated benefit obligation for the plan at December 31, 2016 and 2015 was $587.3 million and $533.1 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, 2016 and 2015 . The fair value of plan assets exceeded the accumulated benefit obligation as of December 31, 2016 and 2015 . 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, 2016, 2015 and 2014 . Year ended December 31 (Dollars in thousands) 2016 2015 2014 Service cost $ 12,618 $ 14,083 $ 12,332 Interest cost 28,892 26,975 25,615 Expected return on assets (36,643 ) (33,198 ) (31,269 ) Amortization of prior service cost 210 210 210 Amortization of net actuarial loss 6,859 11,376 5,148 Total net periodic benefit cost 11,936 19,446 12,036 Current year actuarial loss 56,268 927 69,349 Amortization of actuarial loss (6,859 ) (11,376 ) (5,148 ) Amortization of prior service cost (210 ) (210 ) (210 ) Total recognized in other comprehensive income 49,199 (10,659 ) 63,991 Total recognized in net periodic benefit cost and other comprehensive income $ 61,135 $ 8,787 $ 76,027 The assumptions used to determine the benefit obligations at December 31, 2016 and 2015 are as follows: (Dollars in thousands) 2016 2015 Discount rate 4.30 % 4.68 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 , are as follows: (Dollars in thousands) 2016 2015 2014 Discount rate 4.68 % 4.27 % 4.90 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 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 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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Change in benefit obligation Projected benefit obligation at January 1 $ 143,241 $ 151,332 Service cost 2,567 3,341 Interest cost 6,775 6,393 Actuarial loss (gain) 9,682 (10,937 ) Benefits paid (5,434 ) (4,812 ) Curtailments — (2,076 ) Projected benefit obligation at December 31 156,831 143,241 Change in plan assets Fair value of plan assets at January 1 150,893 155,618 Actual return on plan assets 6,625 87 Benefits paid (5,434 ) (4,812 ) Fair value of plan assets at December 31 152,084 150,893 Funded status at December 31 $ (4,747 ) $ 7,652 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, 2016 and 2015 consist of: (Dollars in thousands) 2016 2015 Other assets $ — $ — Other liabilities (4,747 ) 7,652 Net asset (liability) recognized $ (4,747 ) $ 7,652 The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2016 and 2015 . (Dollars in thousands) 2016 2015 Net loss $ 21,661 $ 7,505 Less prior service cost — — Accumulated other comprehensive loss, excluding income taxes $ 21,661 $ 7,505 The following table provides expected amortization amounts for 2017 . (Dollars in thousands) Actuarial loss $ 855 Prior service cost — Total $ 855 The accumulated benefit obligation for the plan at December 31, 2016 and 2015 was $143.7 million and $131.9 million , respectively. The Bancorporation Plan uses a measurement date of December 31 . The projected benefit obligation exceeded the fair value of plan assets as of December 31, 2016 whereas the fair value of plan assets exceeded the projected benefit obligation as of December 31, 2015 . The fair value of plan assets exceeded the accumulated benefit obligation as of December 31, 2016 and 2015 . 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, 2016 and 2015 . For 2014, the table only includes amounts after the October 1 acquisition of Bancorporation. Year ended December 31 (Dollars in thousands) 2016 2015 2014 Service cost $ 2,567 $ 3,341 $ 832 Interest cost 6,775 6,393 1,488 Expected return on assets (11,101 ) (11,482 ) (2,807 ) Total net periodic benefit cost (1,759 ) (1,748 ) (487 ) Current year actuarial loss 14,157 458 9,123 Curtailments — (2,076 ) — Total recognized in other comprehensive income 14,157 (1,618 ) 9,123 Total recognized in net periodic benefit cost and other comprehensive income $ 12,398 $ (3,366 ) $ 8,636 The assumptions used to determine the benefit obligations at December 31, 2016 and 2015 are as follows: (Dollars in thousands) 2016 2015 Discount rate 4.30 % 4.68 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 are as follows: (Dollars in thousands) 2016 2015 2014 Discount rate 4.68 % 4.27 % 4.35 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 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 For the BancShares Plan and 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 Plans 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. BancShares Plan The fair values of pension plan assets at December 31, 2016 and 2015 , by asset class are as follows: December 31, 2016 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 60,674 $ 60,674 — — 0 - 1% 10 % Equity securities 30 - 70% 54 % Common and preferred stock 66,015 65,964 51 — Mutual funds 256,976 252,710 4,266 — Fixed income 15 - 45% 28 % U.S. government and government agency securities 57,890 47,647 10,243 — Corporate bonds 68,198 — 68,198 — Mutual funds 42,849 42,849 — — Alternative investments 0 - 30% 8 % Mutual funds 48,014 48,014 — — Total pension assets $ 600,616 $ 517,858 $ 82,758 $ — 100 % December 31, 2015 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 % Cash and equivalents comprise approximately 10 percent of BancShares actual plan assets at December 31, 2016 , exceeding the target allocation range due to the $50.0 million contribution to the plan in December 2016. Bancorporation Plan December 31, 2016 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 3,839 $ 3,839 $ — $ — 0 - 1% 2 % Equity securities 30 - 70% 58 % Common and preferred stock 18,274 18,260 14 — Mutual funds 69,978 68,832 1,146 — Fixed income 15 - 45% 31 % U.S. government and government agency securities 15,407 8,919 6,488 — Corporate bonds 19,496 — 19,496 — Mutual funds 11,822 11,822 — — Alternative investments 0 - 30% 9 % Mutual funds 13,268 13,268 — — Total pension assets $ 152,084 $ 124,940 $ 27,144 — December 31, 2015 Market Value Quoted prices in Significant Significant Target Allocation (1) 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 — (1) For 2015, the investment policy for the Bancorporation Plan established 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 granted 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 2017 $ 23,932 $ 6,227 2018 25,377 6,618 2019 26,868 6,903 2020 28,499 7,287 2021 30,193 7,821 2022-2025 176,048 45,713 401(k) Savings Plans Effective January 1, 2015, FCB 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 FCB 401(k) plan and enhanced 401(k) plan did not change as a result of the mergers. 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, FCB makes a makes a matching contribution equal to 100 percent of the first 3 percent and 50 percent of the next 3 percent of the participant's deferral up to and including a maximum contribution of 4.5 percent of the participant's eligible compensation. The matching contribution immediately vests. 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, FCB matches up to 100 percent of the participant's deferrals not to exceed 6 percent of the participant's eligible compensation. The matching contribution immediately vests. 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. FCB made participating contributions to the 401(k) plans of $23.5 million , $22.6 million and $16.4 million during 2016 , 2015 and 2014 , respectively. FCB 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 ten years following separation from service that occurs no earlier than an agreed-upon age. These agreements also provide a death benefit in the event a participant dies prior to separation from service or during the payment period following separation from service. 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, 2016 and 2015 , and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2016 2015 Present value of accrued liability as of January 1 $ 39,878 $ 43,211 Benefit expense and interest cost 3,232 1,386 Benefits paid (4,194 ) (4,485 ) Benefits forfeited (319 ) (234 ) Present value of accrued liability as of December 31 $ 38,597 $ 39,878 Discount rate at December 31 4.30 % 4.68 % Other Compensation Plans FCB offers various short-term and long-term incentive plans for certain employees. Compensation awarded under these plans may be based on defined formulas or other performance criteria, or it may be at the discretion of management. The incentive compensation programs were designed to motivate employees through a balanced approach of risk and reward for their contributions toward FCB's success. As of December 31, 2016 and 2015 , the accrued liability for incentive compensation was $28.4 million and $24.5 million , respectively.

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	12 Months Ended
	Dec. 31, 2016
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, 2016, 2015 and 2014 was $34.2 million , $36.4 million and $29.3 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 shared-loss agreements as noninterest income rather than as an adjustment to the allowance for loan losses. These recoveries were $20.1 million , $21.2 million and $16.2 million for the years ended December 31, 2016, 2015 and 2014 , respectively. Charge-offs on PCI loans are recorded against the discount recognized on the date of acquisition versus through the allowance for loan losses unless an allowance was established subsequent to the acquisition date due to declining expected cash flow. Other noninterest expense for the years ended December 31, 2016, 2015 and 2014 included the following: (Dollars in thousands) 2016 2015 2014 Collection $ 8,889 $ 9,649 $ 11,595 Processing fees paid to third parties 18,976 18,779 17,089 Cardholder reward programs 10,615 11,069 8,252 Telecommunications 14,496 14,406 10,834 Consultant 10,931 8,925 10,168 Core deposit intangible amortization 16,851 18,892 6,955 Advertising 10,239 12,431 11,461 Other 109,050 95,741 76,481 Total other noninterest expense $ 200,047 $ 189,892 $ 152,835

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES At December 31 , income tax expense consisted of the following: (Dollars in thousands) 2016 2015 2014 Current tax expense Federal $ 84,946 $ 105,367 $ 84,430 State 7,493 16,111 13,941 Total current tax expense 92,439 121,478 98,371 Deferred tax expense (benefit) Federal 23,144 (2,758 ) (30,658 ) State 10,002 3,308 (2,681 ) Total deferred tax (benefit) expense 33,146 550 (33,339 ) Total income tax expense $ 125,585 $ 122,028 $ 65,032 Income tax expense does not reflect the tax effects of unrealized gains and losses, the net change from defined benefit pension plans and other income and expenses recorded in accumulated other comprehensive income (AOCI). 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) 2016 2015 2014 Income taxes at federal statutory rates $ 122,874 $ 116,345 $ 71,258 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (2,901 ) (3,020 ) (1,832 ) State and local income taxes, including change in valuation allowance, net of federal income tax benefit 11,372 12,622 7,319 Acquisition stock settlement (98 ) — (10,185 ) Tax credits net of amortization (4,138 ) (3,060 ) (2,896 ) Other, net (1,524 ) (859 ) 1,368 Total income tax expense $ 125,585 $ 122,028 $ 65,032 The net deferred tax asset included the following components at December 31 : (Dollars in thousands) 2016 2015 Allowance for loan and lease losses $ 80,939 $ 78,878 Pension liability 15,679 7,206 Executive separation from service agreements 14,278 9,856 State net operating loss carryforward — 21 Federal net operating loss carryforward from Cordia acquisition 5,019 — Unrealized loss on cash flow hedge — 537 Net unrealized loss on securities included in accumulated other comprehensive loss 26,832 9,379 Accelerated depreciation 133 13,195 FDIC assisted transactions timing differences 52,579 66,456 Other reserves 10,504 10,772 Other 26,663 29,279 Deferred tax asset 232,626 225,579 Lease financing activities 11,651 15,492 Net deferred loan fees and costs 10,867 6,051 Intangible assets 6,335 2,040 Security, loan and debt valuations 22,656 31,486 Other 8,501 12,026 Deferred tax liability 60,010 67,095 Net deferred tax asset $ 172,616 $ 158,484 At December 31, 2016 , $14.3 million of existing gross deferred tax assets relate to net operating loss carryforwards which expire in years beginning in 2024 through 2034. The net operating losses were acquired through the acquisition of Cordia and are subject to the annual limitation set forth by Internal Revenue Code Section 382. No valuation allowance was necessary at December 31, 2016 or 2015 to reduce BancShares’ gross deferred tax asset to the amount that is more likely than not to be realized. During the third quarters of 2016 and 2015 , BancShares adjusted its net deferred tax asset as a result of reductions in the North Carolina corporate income tax rate that were enacted July 23, 2013. The lower corporate income tax rate resulted in a reduction in the deferred tax asset and an increase in income tax expense in 2016 and 2015 . The lower state corporate income tax rate did not have a material impact on income tax expense. On October 1, 2014, Bancorporation merged with and into BancShares in a statutory merger treated as a "reorganization" within the meaning of section 368(a) of the Internal Revenue Code of 1986 as amended. Income tax expense in 2014 was adjusted for the settlement of the ownership of Bancorporation stock at the date of the merger. Income tax expense was also 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. BancShares and its subsidiaries' federal income tax returns for 2013 through 2015 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 exam by North Carolina for 2012 and Missouri for 2011 through 2015. The following table provides a rollforward of Bancshares’ gross unrecognized tax benefits, excluding interest and penalties, during the years ended December 31 : (Dollars in thousands) 2016 2015 2014 Unrecognized tax benefits at the beginning of the year $ 5,975 $ 3,865 $ 2,823 Reductions related to tax positions taken in prior year (327 ) (79 ) — Additions related to tax positions taken in current year 23,231 2,189 1,042 Settlements — — — Unrecognized tax benefits at the end of the year $ 28,879 $ 5,975 $ 3,865 All of the unrecognized tax benefits, if recognized, would affect Bancshares’ effective tax rate. BancShares has unrecognized tax benefits relating to uncertain state tax positions in North Carolina and other state jurisdictions resulting from tax filings submitted to the states. No tax benefit has been recorded for these uncertain tax positions in the financial statements. Bancshares does not expect the unrecognized tax benefits to change significantly during 2017. BancShares recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense. For the years ended December 31, 2016 , 2015 and 2014 , Bancshares recorded $357 thousand , $298 thousand and $1.1 million which primarily represent accrued interest.

Transactions with Related Perso

Transactions with Related Persons	12 Months Ended
	Dec. 31, 2016
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. For those identified as Related Persons as of December 31, 2016 , the following table provides an analysis of changes in the loans outstanding during 2016 and 2015 : Year ended December 31 (dollars in thousands) 2016 2015 Balance at January 1 $ 79 $ 1,045 New loans 314 5 Repayments (40 ) (971 ) Balance at December 31 $ 353 $ 79 Unfunded loan commitments available to Related Persons were $1.8 million and $1.4 million as of December 31, 2016 and 2015 , respectively. During 2014 , fees from processing services included $17.2 million 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 fees for processing services from entities controlled by Related Persons for 2016 and 2015 were not material. BancShares has also provided certain contracted services for entities controlled by Related Persons which have been reimbursed and are not considered material.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2016
Summary of Derivative Instruments [Abstract]
Derivatives	DERIVATIVES BancShares had an interest rate swap entered into during 2011 that qualified as a cash flow hedge under GAAP. The interest rate swap agreement expired in June 2016. At December 31, 2015, the interest rate swap had a notional amount of $93.5 million and the fair value of the outstanding derivative, which was included in the Consolidated Balance Sheets, was $1.4 million . The net change in fair value was included in the Consolidated Statements of Cash Flows under the caption net change in other liabilities. For the year ended December 31, 2016, BancShares recognized interest expense of $1.5 million , and for the years ended December 31, 2015 and 2014, recognized interest expense of $3.3 million for both periods, resulting from incremental interest paid to the interest rate swap counterparty, none of which related to ineffectiveness.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS Goodwill Goodwill was $150.6 million and $139.8 million at December 31, 2016 and 2015 , respectively, with no impairment recorded during 2016, 2015 and 2014 . The following table presents the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 : (Dollars in thousands) 2016 2015 Balance at January 1 $ 139,773 $ 139,773 Acquired in the Cordia merger 10,828 — Balance at December 31 $ 150,601 $ 139,773 Mortgage Servicing Rights Our portfolio of residential mortgage loans serviced for third parties was $2.49 billion , $2.15 billion and $1.95 billion as of December 31, 2016 , 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, 2016 , 2015 and 2014 is presented in the following table: (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 19,351 $ 16,688 $ 16 Servicing rights originated 5,931 5,910 727 Amortization (4,958 ) (4,002 ) (919 ) Servicing rights acquired in the 1st Financial acquisition — — 148 Servicing rights acquired in the Bancorporation merger — — 17,566 Valuation allowance reversal (provision) 91 755 (850 ) Balance at December 31 $ 20,415 $ 19,351 $ 16,688 The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2016 , 2015 and 2014 : (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 95 $ 850 $ — Valuation allowance (reversal) provision (91 ) (755 ) 850 Balance at December 31 $ 4 $ 95 $ 850 At December 31, 2016 and 2015 , the carrying value BancShares' mortgage servicing rights was $20.4 million and $19.4 million , respectively. Contractually specified mortgage servicing fees, late fees, and ancillary fees earned for the years ended December 31, 2016, 2015 and 2014 were $5.8 million , $5.4 million , and $611 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 $5.0 million , $4.0 million , and $919 thousand for the years ended December 31, 2016, 2015 and 2014 , respectively. Mortgage income included an impairment reversal of $91 thousand and $755 thousand for the years ended December 31, 2016 and 2015 , respectively, and an impairment of $850 thousand for the year ended December 31, 2014 . For the servicing rights acquired in the Bancorporation and 1st Financial transactions, 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. 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, 2016 and 2015 were as follows: 2016 2015 Discount rate - conventional fixed loans 9.45 % 9.31 % Discount rate - all loans excluding conventional fixed loans 10.45 % 10.31 % Weighted average constant prepayment rate 10.42 % 11.01 % Weighted average cost to service a loan $ 62.75 $ 56.61 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) 2016 2015 Balance at January 1 $ 71,635 $ 89,922 Acquired in the CCBT acquisition — 690 Acquired in the NMSB acquisition 240 — Acquired in the FCSB acquisition 390 — Acquired in the Cordia acquisition 2,210 — Removal due to branch sale — (85 ) Amortization (16,850 ) (18,892 ) Balance at December 31 $ 57,625 $ 71,635 Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2016 and 2015 . During 2016, BancShares recognized $240 thousand , $390 thousand and $2.2 million in core deposit intangibles related to the NMSB, FCSB and Cordia acquisitions, respectively. 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. 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, 2016 and 2015 , are: (Dollars in thousands) 2016 2015 Gross balance $ 118,041 $ 115,201 Accumulated amortization (60,416 ) (43,566 ) Carrying value $ 57,625 $ 71,635 Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be: (Dollars in thousands) 2017 $ 14,556 2018 12,220 2019 9,892 2020 7,838 2021 5,996

Shareholders' Equity, Dividends

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters	12 Months Ended
	Dec. 31, 2016
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, requirements include a common equity Tier 1 ratio minimum of 4.50 percent , Tier 1 risk-based capital minimum of 6.00 percent , total risk-based capital ratio minimum of 8.00 percent and Tier 1 leverage capital ratio minimum 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 was phased in beginning January 1, 2016 at 0.625 percent of risk-weighted assets and will increase each subsequent year by an additional 0.625 percent until reaching its final level of 2.50 percent on January 1, 2019. 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, 2016 , 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 under Basel III guidelines for BancShares and FCB as of December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Amount Ratio Requirements to be well-capitalized Amount Ratio Requirements to be well-capitalized BancShares Tier 1 risk-based capital $ 2,995,557 12.42 % 8.00 % $ 2,831,242 12.65 % 8.00 % Common equity Tier 1 2,995,557 12.42 6.50 2,799,163 12.51 6.50 Total risk-based capital 3,339,986 13.85 10.00 3,140,212 14.03 10.00 Leverage capital 2,995,557 9.05 5.00 2,831,242 8.96 5.00 FCB Tier 1 risk-based capital 2,942,829 12.25 8.00 2,821,475 12.64 8.00 Common equity Tier 1 2,942,829 12.25 6.50 2,821,475 12.64 6.50 Total risk-based capital 3,172,757 13.21 10.00 3,038,070 13.61 10.00 Leverage capital 2,942,829 8.94 5.00 2,821,475 8.95 5.00 BancShares and FCB had capital conservation buffers above minimum risk-based capital requirements of 5.85 percent and 5.21 percent , respectively, at December 31, 2016 . The buffers exceed the 0.625 percent requirement and, therefore, result in no limit on distributions. At December 31, 2016 , BancShares had no trust preferred capital securities included in Tier 1 capital, compared to $32.1 million at December 31, 2015 . Effective January 1, 2015 , 75 percent of BancShares' trust preferred capital securities were excluded from Tier 1 capital and the remaining 25 percent were phased out January 1, 2016 under Basel III requirements. Management continues to monitor developments and remains committed to managing capital levels in a prudent manner. At December 31, 2016 and December 31, 2015 , Tier 2 capital of BancShares included $3.0 million and $6.0 million , respectively, of qualifying subordinated debt 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 2016, our Board approved a stock repurchase plan that provides for the purchase of up to 200,000 shares of Class A common stock. The shares may be purchased from time to time from November 1, 2016 through October 31, 2017. That authority replaced a similar plan in effect during the twelve months preceding November 1, 2016. The Board's action approving share purchases does not obligate BancShares to acquire any particular amount of shares and purchases may be suspended or discontinued at any time. Any shares of stock that are purchased will be canceled. As of December 31, 2016 , no purchases had occurred pursuant to either 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, 2016 , the maximum amount of the dividend was limited to $928.7 million to preserve well-capitalized status. Dividends declared by FCB and paid to BancShares amounted to $90.1 million in 2016 , $75.0 million in 2015 and $30.0 million in 2014 . 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 2016 , the requirements averaged $575.7 million .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
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, 2016 , BancShares had unused commitments to extend credit that were $8.81 billion , compared to $7.95 billion at December 31, 2015 . Total unfunded commitments relating to investments in affordable housing projects were $57.1 million and $41.8 million at December 31, 2016 and December 31, 2015 , respectively, and are included in other liabilities on BancShares' Consolidated Balance Sheet. Standby letters of credit are commitments guaranteeing performance of a customer to a third party. Those commitments are primarily issued to support public and private borrowing arrangements, and the fair value of those commitments is not material. To mitigate its risk, BancShares’ credit policies govern the issuance of standby letters of credit. At December 31, 2016 and 2015 , BancShares had standby letters of credit amounting to $83.8 million and $77.9 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 sold on a non-recourse basis, 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 fails to perform per the terms of the loan purchase agreement, typically within 180 days from the date of 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 as of December 31, 2016 and 2015 for estimated losses arising from these standard representation and warranty provisions. BancShares has recorded a receivable from the FDIC totaling $4.2 million and $4.1 million as of December 31, 2016 and 2015 , respectively, for the expected reimbursement of losses on assets covered under the various shared-loss agreements. The shared-loss agreements are subject to interpretation by both the FDIC and BancShares, and disagreements may arise regarding coverage of losses, expenses and contingencies and requests for reimbursement may be delayed or disallowed for noncompliance. See Note H for additional information on the receivable from the FDIC regarding the early termination of five shared-loss agreements during 2016. The shared-loss agreements for two 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 under the relevant shared-loss agreements. As of December 31, 2016 and 2015 , the clawback liability was $97.0 million and $126.5 million , respectively. See Note H for additional information on the clawback liability regarding the early termination of five shared-loss agreements during 2016. BancShares entered into forward-starting advances with the FHLB of Atlanta in June 2016 to receive $200.0 million of fixed rate long-term funding. There are two advances of $100.0 million each scheduled to fund in June 2018 with maturity dates of June 2026 and 2028. 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, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Accumulated other comprehensive loss included the following at December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Unrealized losses on investment securities available for sale $ (72,707 ) $ (26,832 ) $ (45,875 ) $ (24,504 ) $ (9,379 ) $ (15,125 ) Unrealized loss on cash flow hedge — — — (1,429 ) (537 ) (892 ) Funded status of defined benefit plan (141,774 ) (52,457 ) (89,317 ) (78,419 ) (29,996 ) (48,423 ) Total $ (214,481 ) $ (79,289 ) $ (135,192 ) $ (104,352 ) $ (39,912 ) $ (64,440 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2016 and 2015 : (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, 2015 $ 5,098 $ (2,664 ) $ (55,415 ) $ (52,981 ) Other comprehensive (loss) income 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 ) Other comprehensive (loss) income before reclassifications (13,946 ) 892 (45,347 ) (58,401 ) Amounts reclassified from accumulated other comprehensive (loss) income (16,804 ) — 4,453 (12,351 ) Net current period other comprehensive (loss) income (30,750 ) 892 (40,894 ) (70,752 ) Balance at December 31, 2016 $ (45,875 ) $ — $ (89,317 ) $ (135,192 ) (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, 2016 and 2015 : (Dollars in thousands) Year ended December 31, 2016 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 $ 26,673 Securities gains (9,869 ) Income taxes $ 16,804 Net income Amortization of defined benefit pension items Prior service costs $ (210 ) Employee benefits Actuarial losses (6,859 ) Employee benefits (7,069 ) Employee benefits 2,616 Income taxes $ (4,453 ) Net income Total reclassifications for the period $ 12,351 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 (1) Amounts in parentheses indicate debits to profit/loss.

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2016
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, 2016 December 31, 2015 Assets Cash $ 8,278 $ 24,869 Overnight investments 26,157 1,416 Investment securities available for sale 95,564 21,137 Investment in banking subsidiaries 2,932,048 2,874,581 Investment in other subsidiaries 41,066 43,117 Other assets 92,787 73,944 Total assets $ 3,195,900 $ 3,039,064 Liabilities and Shareholders' Equity Long-term obligations $ 126,861 $ 133,775 Due to subsidiaries 56,323 29,682 Other liabilities 289 3,498 Shareholders' equity 3,012,427 2,872,109 Total liabilities and shareholders' equity $ 3,195,900 $ 3,039,064 Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2016 2015 2014 Interest income $ 1,110 $ 645 $ 1,784 Interest expense 6,067 6,793 9,694 Net interest loss (4,957 ) (6,148 ) (7,910 ) Dividends from banking subsidiaries 90,055 75,006 82,419 Dividends from other subsidiaries — 23,500 — Other income 9,330 1,870 33,600 Other operating expense 5,641 2,634 6,534 Income before income tax benefit and equity in undistributed net income of subsidiaries 88,787 91,594 101,575 Income tax benefit (730 ) (2,618 ) (2,590 ) Income before equity in undistributed net income of subsidiaries 89,517 94,212 104,165 Equity in undistributed net income of subsidiaries 135,965 116,174 34,397 Net income $ 225,482 $ 210,386 $ 138,562 Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2016 2015 2014 OPERATING ACTIVITIES Net income $ 225,482 $ 210,386 $ 138,562 Adjustments Undistributed net income of subsidiaries (135,965 ) (116,174 ) (34,397 ) Net amortization of premiums and discounts (6,838 ) (2,712 ) 594 Securities gains (9,446 ) (236 ) (29,126 ) Gain on elimination of acquired debt — — (1,988 ) Change in other assets (20,845 ) (3,070 ) 93,385 Change in other liabilities (1,780 ) (1,157 ) 2,250 Net cash provided by operating activities 50,608 87,037 169,280 INVESTING ACTIVITIES Net change in due from subsidiaries — 295,994 (150,328 ) Net change in overnight investments (24,741 ) (1,416 ) — Purchases of investment securities (93,003 ) (7,818 ) (33,243 ) Proceeds from sales, calls, and maturities of securities 38,316 100,586 114,208 Investment in subsidiaries — — 1,579 Business acquisitions, net of cash acquired — — (24,772 ) Net cash (used) provided by investing activities (79,428 ) 387,346 (92,556 ) FINANCING ACTIVITIES Net change in due to subsidiaries 26,641 29,682 — Net change in short-term borrowings — (485,207 ) (1,211 ) Retirement of long-term obligations — — (52,372 ) Stock issuance costs — — (619 ) Cash dividends paid (14,412 ) (18,015 ) (11,543 ) Net cash provided (used) by financing activities 12,229 (473,540 ) (65,745 ) Net change in cash (16,591 ) 843 10,979 Cash balance at beginning of year 24,869 24,026 13,047 Cash balance at end of year $ 8,278 $ 24,869 $ 24,026

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2016
Subsequent Event [Line Items]
Subsequent Events	SUBSEQUENT EVENTS On January 13, 2017, FCB announced that it entered into an agreement with the FDIC, as Receiver, to purchase certain assets and assume certain liabilities of Harvest Community Bank (HCB) of Pennsville, New Jersey. On January 14, 2017, HCB branches began operating as branches of FCB. As part of the agreement, FCB received $22.8 million in cash from the FDIC. HCB had total loans of $98.8 million and total deposits of $122.2 million at December 31, 2016. Due to the close proximity of the acquisition date and the date that BancShares' financial statements were issued, preliminary fair value estimates are not available.

Accounting Policies and Basis33

Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2016
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 September 1, 2016, First Citizens Bank completed the merger of Midlothian, Virginia-based Cordia Bancorp, Inc. (Cordia) and its subsidiary, Bank of Virginia (BVA) into FCB. Under the terms of the merger agreement, cash consideration of $5.15 was paid to Cordia’s shareholders for each of their shares of Cordia’s common stock, with total consideration paid of $37.1 million . On June 14, 2016, FCB terminated five of FCB's nine shared-loss agreements with the Federal Deposit Insurance Corporation (FDIC), including Temecula Valley Bank (TVB), Sun American Bank (SAB), Williamsburg First National Bank (WFNB), Atlantic Bank & Trust (ABT) and Colorado Capital Bank (CCB). The resulting positive net impact to pre-tax earnings from the early termination of the FDIC shared-loss agreements was $16.6 million during 2016. See Note H for additional information regarding the FDIC shared-loss termination. On May 6, 2016, FCB purchased certain assets and assumed certain liabilities of First CornerStone Bank (FCSB) of King of Prussia, Pennsylvania from the FDIC. On March 11, 2016, FCB purchased certain assets and assumed certain liabilities of North Milwaukee State Bank (NMSB) of Milwaukee, Wisconsin from the FDIC. On February 13, 2015, FCB purchased certain assets and assumed certain liabilities of Capitol City Bank & Trust (CCBT) of Atlanta, Georgia from the FDIC. In accordance with the acquisition method of accounting, all assets and liabilities were recorded at their fair value as of the acquisition date. 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 Business Combinations. Nature of Operations FCB operates 550 branches in North Carolina, South Carolina, Virginia, West Virginia, Maryland, Tennessee, California, Washington, Florida, Georgia, Texas, Arizona, New Mexico, Colorado, Oregon, Missouri, Oklahoma, Kansas, Pennsylvania, Wisconsin and New Jersey. 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), title insurance is offered through Neuse Financial Services, Inc., and investment advisory services are provided through First Citizens Asset Management, Inc. (FCAM). First Citizens Securities Corporation 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 without additional subordinated financial support, 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 the 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; • Goodwill and other intangible assets; • FDIC shared-loss receivable and payable; and • 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, 2016 and 2015 , 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. Non-marketable 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. Non-marketable 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. Non-marketable securities are recorded within other assets in the Consolidated Balance Sheets. FHLB and non-marketable securities were $43.8 million and $37.7 million at December 31, 2016 and 2015 , respectively. Investments in Qualified Affordable Housing Projects BancShares and FCB have investments in certain partnerships and limited liability entities primarily for the purposes of fulfilling Community Reinvestment Act requirements and obtaining tax credits and accounts for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the income statement as a component of income tax expense. All of the investments held in qualified affordable housing projects qualify for the proportional amortization method and were $109.8 million and $85.6 million at December 31, 2016 and December 31, 2015 , respectively, and are included in other assets on the Consolidated Balance Sheets.
Loans Held For Sale	Loans Held For Sale BancShares elected to apply the fair value option for new originations of prime residential mortgage loans to be sold. BancShares elected the fair value option 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 $6.7 million and $16.6 million at December 31, 2016 and 2015 , 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 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. PCI loans 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 reflect credit deterioration since origination such that it is probable at acquisition that BancShares will be unable to collect all contractually required payments. At 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. 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, BancShares continues to estimate cash flows expected to be collected on individual loans or on 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 determined using the effective interest rates has decreased and if so, recognizes provision for loan and lease losses in the 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, accretion income is recognized except for situations when the timing and amount of future cash flows cannot be determined. PCI loans with uncertain future cash flows are accounted for under the cost recovery method and those loans are generally reported as nonaccrual. For PCI loans 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. Loans that have been restructured as a TDR are treated and reported as such for the remaining life of the loan. 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 and leases. 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. 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, including TDRs, are generally removed from nonaccrual status when they become current as to both principal and interest, the borrower has demonstrated a sustained period of repayment performance for a reasonable period, generally a minimum of six months, 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). NRV 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 at least annual periodic revaluations of the underlying collateral. 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 also recorded in foreclosure-related expense.
Covered Assets and Receivable from FDIC for Loss Share Agreements	Covered Assets and Receivable from FDIC for Shared-Loss Agreements Assets subject to shared-loss agreements with the FDIC include certain loans and leases and OREO. These shared-loss 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 shared-loss 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 shared-loss 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 shared-loss 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 shared-loss 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 shared-loss agreements. Upon evaluation of certain characteristics, circumstances, nature and remaining term associated with and balance of indemnification assets, management may determine different subsequent accounting treatment to be appropriate. Collection and other servicing costs related to loans covered under FDIC shared-loss 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 (SBA) 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 Shared-Loss 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 shared-loss 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 shared-loss payable. The ultimate settlement amount of the payment is dependent upon the performance of the underlying covered loans, recoveries, 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 historical net 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, certain loan loss factors related to the quantitative component of the ALLL and reserve factors related to the qualitative component of the ALLL were updated in 2016. This methodology update resulted in no material net impact to the ALLL. 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. 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, 2016 . 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 and are paying principal and interest based upon contractual terms 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 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 materially 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 and are paying principal and interest based upon contractual terms 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 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 and student loans. 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 leases 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 letters of credit. The reserve is calculated in a manner similar to the loans evaluated collectively for impairment, while also considering the applicable regulatory capital credit conversion factors for these off-balance sheet instruments 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 material at December 31, 2016 or 2015 .
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, 2016 and 2015 , impairment tests, 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 2016 . 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 noninterest 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, 2016 and 2015 , BancShares had $590.8 million and $592.2 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 has unrecognized tax benefits related to the uncertain portion of tax positions that BancShares has taken or expects to take. A liability may be created or an amount refundable may be reduced for the amount of unrecognized tax benefits. These uncertainties result from the application of complex tax laws, rules, regulations and interpretations, primarily in state taxing jurisdictions. Unrecognized tax benefits are assessed quarterly and may be adjusted through current income tax expense in future periods based on changing facts and circumstances, completion of examinations by taxing authorities or expiration of a statute of limitations. Estimated penalties and interest on uncertain tax positions are recognized in income tax expense. 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. BancShares had an interest rate swap, entered into during 2011, that qualified as a cash flow hedge under GAAP and converted variable-rate exposure on outstanding debt to a fixed rate. BancShares' interest rate swap agreement expired in June 2016. At December 31, 2015, the fair value of the outstanding derivative was included in other liabilities in the Consolidated Balance Sheets and the net change in fair value was included in the net change in other liabilities on the Consolidated Statements of Cash Flows. BancShares’ interest rate swap was fully effective since inception; therefore, changes in the fair value of the interest rate swap had no impact on net income. There were no speculative derivative financial instruments in any period presented.
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. The assumed rate of future compensation increases is reviewed annually based on actual experience and future salary expectations. We also estimate a long-term rate of return on pension plan assets that is used to estimate the future value of plan assets. We consider such factors as the actual return earned on plan assets, historical returns on the various asset classes in the plans and projections of future returns on various asset classes. 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) 2015-16, 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 adopted the guidance effective in the first quarter of 2016. During the third quarter of 2016, adjustments were made to the acquisition fair value for the FDIC-assisted acquisition of FCSB. The adjustments were primarily based upon updated collateral valuations, resulting in an increase of $837 thousand to the gain on acquisition. These adjustments brought the total gain on the transaction to $3.0 million and are included in noninterest income in the Consolidated Statements of Income. During the second quarter of 2016, adjustments were made to the acquisition fair values for the FDIC-assisted acquisition of NMSB, primarily based upon updated collateral valuations, resulting in an increase of $1.2 million to the gain on acquisition. These adjustments brought the total gain on the transaction to $2.9 million and are included in noninterest income in the Consolidated Statements of Income. 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 (VIE), 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 fiscal years beginning after December 15, 2015 for public business entities, including interim periods within those fiscal years. We adopted the guidance effective in the first quarter of 2016. We evaluated our investments in partnerships and limited liability entities under the new guidance and concluded that not consolidating was still appropriate and did not have an impact on our consolidated financial position or consolidated results of operations. Recently Issued Accounting Pronouncements FASB ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash The amendments in this ASU require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This ASU does not provide a definition of restricted cash or restricted cash equivalents. This ASU is effective for fiscal years beginning after December 15, 2017 for public business entities, including interim periods within those fiscal years. BancShares does not anticipate any affect on our Consolidated Statements of Cash Flows. FASB ASU 2016-17, Consolidation (Topic 810): Interests Held Through Related Parties That Are under Common Control This ASU does not change the characteristics of a primary beneficiary in current GAAP; however, it requires that a reporting entity, in determining whether it satisfies the second characteristic of a primary beneficiary, to include all of its direct variable interests in a VIE and, on a proportionate basis, its indirect variable interests in a VIE held through related parties, including related parties that are under common control with the reporting entity. If, after performing that assessment, a reporting entity that is the single decision maker of a VIE concludes that it does not have the characteristics of a primary beneficiary, the amendments continue to require that reporting entity to evaluate whether it and one or more of its related parties under common control, as a group, have the characteristics of a primary beneficiary, then the party within the related party group that is most closely associated with the VIE is the primary beneficiary. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. We will adopt the guidance during the first quarter of 2017. BancShares does not anticipate any effect on our consolidated financial position or consolidated results of operations as a result of adoption. FASB ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory This ASU states that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory, such as intellectual property or property, plant and equipment, when the transfer occurs. This ASU does not change GAAP for an intra-entity transfer of inventory. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The amendments in this ASU are effective for pubic business entities for fiscal years beginning after December 15, 2017, including interim reporting periods within those annual reporting periods, and should be applied on a modified retrospective basis. The adoption of this standard is not expected to have a significant impact on our consolidated financial position or results of operation and we will adopt the guidance during the first quarter of 2018. FASB ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments This ASU addresses the diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments in this ASU provide guidance on (1) debt prepayment or debt extinguishment costs; (2) settlement of zero-coupon debt instruments; (3) contingent consideration payments made after a business combination; (4) proceeds from the settlement of insurance claims; (5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; (6) distributions received from equity method investees; (7) beneficial interests in securitization transactions; and (8) separately identifiable cash flows and application of the predominance principle. 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. Early adoption is permitted. The guidance requires application using a retrospective transition method. We will adopt the guidance during the first quarter of 2018. The adoption of this standard is not expected to have a significant impact on our Consolidated Statements of Cash Flows. FASB ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This ASU eliminates the delayed recognition of the full amount of credit losses until the loss was probable of occurring and instead will reflect an entity's current estimate of all expected credit losses. The amendments in this ASU broaden the information that an entity must consider in developing its expected credit loss estimate for assets measured either collectively or individually. The ASU does not specify a method for measuring expected credit losses and allows an entity to apply methods that reasonably reflect its expectations of the credit loss estimate based on the entity's size, complexity and risk profile. In addition, the disclosures of credit quality indicators in relation to the amortized cost of financing receivables, a current disclosure requirement, are further disaggregated by year of origination. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018. We will adopt the guidance by the first quarter of 2020 with a cumulative-effect adjustment to retained earnings as of the beginning of the year of adoption. We are currently evaluating the impact the new standard will have on our consolidated financial statements. Upon adoption, our allowance for loan and lease losses will be impacted by the loan portfolio composition and quality at the adoption date as well as economic conditions and forecasts at that time. FASB ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting This ASU eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The ASU requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. Further, the ASU requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings, the unrealized gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The amendments in this ASU are effective for all entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. We will adopt the guidance during the first quarter of 2017. BancShares does not anticipate any effect on our consolidated financial position or consolidated results of operations as a result of adoption. FASB ASU 2016-02, Leases (Topic 842) This ASU increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The key difference between existing standards and this ASU is the requirement for lessees to recognize on their balance sheet all lease contracts. An entity may make an accounting election by classification to not recognize leases with terms less than 12 months on their balance sheet. Both a right-of-use asset, representing the right to use the leased asset, and a lease liability, representing the contractual obligation, are required to be recognized on the balance sheet of the lessee at lease commencement. Further, this ASU requires lessees to classify leases as either operating or finance leases, which are substantially similar to the current operating and capital leases classifications. The distinction between these two classifications under the new standard does not relate to balance sheet treatment, but relates to treatment in the statements of income and cash flows. Lessor guidance remains largely unchanged with the exception of how a lessor determines the appropriate lease classification for each lease to better align the lessor guidance with revised lessee classification guidance. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We will adopt during the first quarter of 2019. While we are currently evaluating the impact of the new standard, we expect an increase to the Consolidated Balance Sheets for right-of-use assets and associated lease liabilities, as well as resulting depreciation expense of the right-of-use assets and interest expense of the lease liabilities in the Consolidated Statements of Income, for arrangements previously accounted for as operating leases. 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 of certain financial instruments. 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 a readily determinable fair value; (3) 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; (4) require public business entities to use exit price notion, rather than entry prices, when measuring fair value of financial instruments for disclosure purposes; (5) 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; (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 will adopt during the first quarter of 2018 with a cumulative-effect adjustment from AOCI to retained earnings as of the beginning of the year of adoption. We are currently evaluating the impact the new standard will have on our consolidated financial statements. The cumulative-effect adjustment will be impacted by the equity securities portfolio composition and valuation at the date 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. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations , to improve the operability and understandability of the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing , to clarify guidance for identifying performance obligations and licensing implementation. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , to clarify and improve the guidance for certain aspects of Topic 606. 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. Our revenue is comprised of net interest income on financial assets and liabilities, which is explicitly excluded from the scope of the new guidance, and noninterest income. We continue to evaluate the impact of the new standard on our noninterest income and on our presentation and disclosures. We expect to adopt the ASU during the first quarter of 2018 with a cumulative-effect adjustment to opening retained earnings and the modified retrospective approach will likely be used.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2016
Cordia Bancorp Inc.
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) As recorded by FCB Purchase price $ 37,053 Assets Cash and due from banks $ 8,383 Overnight investments 3,081 Investment securities available for sale 76,633 Loans and leases 241,392 Premises and equipment 4,151 Other real estate owned 1,170 Income earned not collected 1,990 Intangible assets 2,210 Other assets 10,318 Total assets acquired 349,328 Liabilities Deposits 292,192 Short-term borrowings 30,164 Other liabilities 747 Total liabilities assumed $ 323,103 Fair value of net assets acquired 26,225 Goodwill recorded for Cordia $ 10,828
First CornerStone Bank
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 due from banks $ 748 Overnight investments 37,540 Investment securities 4,564 Loans 43,776 Other real estate owned 375 Income earned not collected 8 Intangible assets 390 Other assets 13 Total assets acquired 87,414 Liabilities Deposits 96,882 Other liabilities 23 Total liabilities assumed 96,905 Fair value of net liabilities assumed (9,491 ) Cash received from FDIC 12,450 Gain on acquisition of FCSB $ 2,959
North Milwaukee State Bank
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 due from banks $ 4,545 Overnight investments 2,274 Investment securities available for sale 9,425 Loans 36,914 Other intangible assets 240 Other assets 216 Total assets acquired 53,614 Liabilities Deposits 59,206 Short-term borrowings 1,662 Other liabilities 74 Total liabilities assumed 60,942 Fair value of net liabilities assumed (7,328 ) Cash received from FDIC 10,200 Gain on acquisition of NMSB $ 2,872

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , were as follows: December 31, 2016 (Dollars in thousands) Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities available for sale U.S. Treasury $ 1,650,675 $ 579 $ 935 $ 1,650,319 Government agency 40,291 107 — 40,398 Mortgage-backed securities 5,259,466 2,809 86,850 5,175,425 Equity securities 71,873 11,634 — 83,507 Corporate bonds 49,367 195 — 49,562 Other 7,615 — 246 7,369 Total investment securities available for sale $ 7,079,287 $ 15,324 $ 88,031 $ 7,006,580 December 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value 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 Corporate bonds 8,500 — — 8,500 Other 2,115 45 — 2,160 Total investment securities available for sale $ 6,885,797 $ 6,367 $ 30,871 $ 6,861,293 December 31, 2016 Cost Gross unrealized gains Gross unrealized losses Fair value Investment securities held to maturity Mortgage-backed securities $ 98 $ 6 $ — $ 104 December 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Mortgage-backed securities $ 255 $ 10 $ — $ 265
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, 2016 December 31, 2015 (Dollars in thousands) Cost Fair value Cost Fair value Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 842,798 $ 842,947 $ 1,255,714 $ 1,255,094 One through five years 848,168 847,770 919,086 918,448 Five through 10 years 49,367 49,562 8,500 8,500 Over 10 years 7,615 7,369 2,115 2,160 Mortgage-backed securities 5,259,466 5,175,425 4,692,447 4,668,198 Equity securities 71,873 83,507 7,935 8,893 Total investment securities available for sale $ 7,079,287 $ 7,006,580 $ 6,885,797 $ 6,861,293 Investment securities held to maturity Mortgage-backed securities held to maturity $ 98 $ 104 $ 255 $ 265
Securities Gains (Losses)	For each period presented, securities gains (losses) include the following: Year ended December 31 (Dollars in thousands) 2016 2015 2014 Gross gains on retirement/sales of investment securities available for sale $ 27,104 $ 10,834 $ 29,129 Gross losses on sales of investment securities available for sale (431 ) (17 ) (33 ) Total securities gains $ 26,673 $ 10,817 $ 29,096
Investment Securities With Unrealized Losses	The following table provides information regarding securities with unrealized losses as of December 31, 2016 and 2015 : December 31, 2016 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 $ 807,822 $ 935 $ — $ — $ 807,822 $ 935 Mortgage-backed securities 4,442,700 82,161 362,351 4,689 4,805,051 86,850 Other 7,369 246 — — 7,369 246 Total $ 5,257,891 $ 83,342 $ 362,351 $ 4,689 $ 5,620,242 $ 88,031 December 31, 2015 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 $ 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 Total $ 5,340,271 $ 24,777 $ 280,126 $ 6,094 $ 5,620,397 $ 30,871

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]
Loans And Leases Outstanding	Loans and leases outstanding include the following at December 31, 2016 and 2015 : (Dollars in thousands) December 31, 2016 December 31, 2015 Non-PCI loans and leases: Commercial: Construction and land development $ 649,157 $ 620,352 Commercial mortgage 9,026,220 8,274,548 Other commercial real estate 351,291 321,021 Commercial and industrial 2,567,501 2,368,958 Lease financing 826,270 730,778 Other 340,264 314,832 Total commercial loans 13,760,703 12,630,489 Noncommercial: Residential mortgage 2,889,124 2,695,985 Revolving mortgage 2,601,344 2,523,106 Construction and land development 231,400 220,073 Consumer 1,446,138 1,219,821 Total noncommercial loans 7,168,006 6,658,985 Total non-PCI loans and leases 20,928,709 19,289,474 PCI loans: Commercial: Construction and land development 20,766 33,880 Commercial mortgage 453,013 525,468 Other commercial real estate 12,645 17,076 Commercial and industrial 11,844 15,182 Other 1,702 2,008 Total commercial loans 499,970 593,614 Noncommercial: Residential mortgage 268,777 302,158 Revolving mortgage 38,650 52,471 Consumer 1,772 2,273 Total noncommercial loans 309,199 356,902 Total PCI loans 809,169 950,516 Total loans and leases $ 21,737,878 $ 20,239,990
Composition Of The Loans And Leases Outstanding By Credit Quality Indicator	The composition of the loans and leases outstanding at December 31, 2016 , and December 31, 2015 , by credit quality indicator is provided below: December 31, 2016 (Dollars in thousands) Non-PCI commercial loans and leases Grade: Construction and land Commercial Other Commercial and Lease financing Other Total non-PCI commercial loans and leases Pass $ 645,232 $ 8,821,439 $ 347,509 $ 2,402,659 $ 818,008 $ 335,831 $ 13,370,678 Special mention 2,236 76,084 1,433 22,804 2,675 1,020 106,252 Substandard 1,683 126,863 2,349 17,870 5,415 3,413 157,593 Doubtful 6 334 — 8 — — 348 Ungraded — 1,500 — 124,160 172 — 125,832 Total $ 649,157 $ 9,026,220 $ 351,291 $ 2,567,501 $ 826,270 $ 340,264 $ 13,760,703 December 31, 2015 Non-PCI commercial loans and leases Construction and land Commercial Other Commercial and Lease financing Other Total non-PCI commercial loans and leases 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, 2016 Non-PCI noncommercial loans and leases (Dollars in thousands) Residential Revolving Construction Consumer Total non-PCI noncommercial Current $ 2,839,045 $ 2,576,942 $ 229,106 $ 1,434,658 $ 7,079,751 30-59 days past due 27,760 14,290 1,139 6,775 49,964 60-89 days past due 7,039 2,698 598 2,779 13,114 90 days or greater past due 15,280 7,414 557 1,926 25,177 Total $ 2,889,124 $ 2,601,344 $ 231,400 $ 1,446,138 $ 7,168,006 December 31, 2015 Non-PCI noncommercial loans and leases Residential Revolving Construction Consumer Total non-PCI noncommercial 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, 2016 (Dollars in thousands) PCI commercial loans Grade: Construction Commercial Other Commercial Other Total PCI commercial Pass $ 8,103 $ 234,023 $ 8,744 $ 7,253 $ 696 $ 258,819 Special mention 950 67,848 102 620 — 69,520 Substandard 7,850 138,312 3,462 3,648 1,006 154,278 Doubtful 3,863 12,830 337 303 — 17,333 Ungraded — — — 20 — 20 Total $ 20,766 $ 453,013 $ 12,645 $ 11,844 $ 1,702 $ 499,970 December 31, 2015 PCI commercial loans Construction Commercial Other Commercial Other Total PCI commercial 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, 2016 PCI noncommercial loans (Dollars in thousands) Residential Revolving Consumer Total PCI noncommercial Current $ 230,065 $ 33,827 $ 1,637 $ 265,529 30-59 days past due 9,595 618 68 10,281 60-89 days past due 6,528 268 4 6,800 90 days or greater past due 22,589 3,937 63 26,589 Total $ 268,777 $ 38,650 $ 1,772 $ 309,199 December 31, 2015 PCI noncommercial loans Residential Revolving Consumer Total PCI noncommercial 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
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, 2016 , and December 31, 2015 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, 2016 (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 $ 1,845 $ 39 $ 286 $ 2,170 $ 646,987 $ 649,157 Commercial mortgage 11,592 2,773 10,329 24,694 9,001,526 9,026,220 Other commercial real estate 310 — — 310 350,981 351,291 Commercial and industrial 7,918 2,102 1,051 11,071 2,556,430 2,567,501 Lease financing 1,175 444 863 2,482 823,788 826,270 Residential mortgage 27,760 7,039 15,280 50,079 2,839,045 2,889,124 Revolving mortgage 14,290 2,698 7,414 24,402 2,576,942 2,601,344 Construction and land development - noncommercial 1,139 598 557 2,294 229,106 231,400 Consumer 6,775 2,779 1,926 11,480 1,434,658 1,446,138 Other 72 — 198 270 339,994 340,264 Total non-PCI loans and leases $ 72,876 $ 18,472 $ 37,904 $ 129,252 $ 20,799,457 $ 20,928,709 December 31, 2015 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
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, 2016 and December 31, 2015 for non-PCI loans, were as follows: December 31, 2016 December 31, 2015 (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 $ 606 $ — $ 425 $ 273 Commercial mortgage 26,527 482 42,116 242 Other commercial real estate 86 — 239 — Commercial and industrial 4,275 440 6,235 953 Lease financing 359 683 389 — Residential mortgage 32,470 37 29,977 838 Revolving mortgage 14,308 — 12,704 — Construction and land development - noncommercial 1,121 — 2,164 — Consumer 2,236 1,076 1,472 1,007 Other 319 — 133 2 Total non-PCI loans and leases $ 82,307 $ 2,718 $ 95,854 $ 3,315
Schedule of Contractually Required Payments Including Principal and Interest Expected Cash Flows to be Collected and Fair Values [Table Text Block]	The following table relates to purchased non-PCI loans and leases acquired in the Cordia transaction during 2016 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 acquisition date. (Dollars in thousands) 2016 Contractually required payments $ 296,529 Contractual cash flows not expected to be collected $ 2,678 Fair value at acquisition date $ 241,392 The following table relates to PCI loans acquired in the NMSB and FCSB acquisitions for 2016 and the CCBT acquisition for 2015. 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 acquisition dates. (Dollars in thousands) 2016 2015 Contractually required payments $ 108,649 $ 247,812 Cash flows expected to be collected $ 93,178 $ 207,688 Fair value of loans at acquisition $ 80,690 $ 154,496
Changes In Carrying Value Of Acquired Impaired Loans	The recorded fair values of PCI loans acquired in the NMSB, FCSB and CCBT transactions as of their respective acquisition date were as follows: (Dollars in thousands) 2016 2015 Commercial: Construction and land development $ 684 $ 4,116 Commercial mortgage 50,372 129,732 Other commercial real estate 2,629 3,202 Commercial and industrial 3,630 2,844 Other 1,619 — Total commercial loans 58,934 139,894 Noncommercial: Residential mortgage 18,934 13,251 Revolving mortgage 1,238 — Construction and land development 340 — Consumer 1,244 1,351 Total noncommercial loans 21,756 14,602 Total PCI loans $ 80,690 $ 154,496 The following table provides changes in the carrying value of PCI loans during the years ended December 31, 2016 and 2015 : (Dollars in thousands) 2016 2015 Balance at January 1 $ 950,516 $ 1,186,498 Fair value of PCI loans acquired during the year 80,690 154,496 Accretion 76,565 114,580 Payments received and other changes, net (298,602 ) (505,058 ) Balance at December 31 $ 809,169 $ 950,516 Unpaid principal balance at December 31 $ 1,266,395 $ 1,693,372
Changes In The Amount Of Accretable Yield	The recorded fair values of purchased non-PCI loans and leases acquired in the Cordia transaction as of the acquisition date are as follows: (Dollars in thousands) 2016 Commercial: Construction and land development $ 3,066 Commercial mortgage 77,455 Other commercial real estate 22,174 Commercial and industrial 31,773 Total commercial loans and leases 134,468 Noncommercial: Residential mortgage 16,839 Revolving mortgage 9,867 Consumer 80,218 Total noncommercial loans and leases 106,924 Total non-PCI loans $ 241,392

Schedule of Loans Receivable (T

Schedule of Loans Receivable (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans And Leases Outstanding	Loans and leases outstanding include the following at December 31, 2016 and 2015 : (Dollars in thousands) December 31, 2016 December 31, 2015 Non-PCI loans and leases: Commercial: Construction and land development $ 649,157 $ 620,352 Commercial mortgage 9,026,220 8,274,548 Other commercial real estate 351,291 321,021 Commercial and industrial 2,567,501 2,368,958 Lease financing 826,270 730,778 Other 340,264 314,832 Total commercial loans 13,760,703 12,630,489 Noncommercial: Residential mortgage 2,889,124 2,695,985 Revolving mortgage 2,601,344 2,523,106 Construction and land development 231,400 220,073 Consumer 1,446,138 1,219,821 Total noncommercial loans 7,168,006 6,658,985 Total non-PCI loans and leases 20,928,709 19,289,474 PCI loans: Commercial: Construction and land development 20,766 33,880 Commercial mortgage 453,013 525,468 Other commercial real estate 12,645 17,076 Commercial and industrial 11,844 15,182 Other 1,702 2,008 Total commercial loans 499,970 593,614 Noncommercial: Residential mortgage 268,777 302,158 Revolving mortgage 38,650 52,471 Consumer 1,772 2,273 Total noncommercial loans 309,199 356,902 Total PCI loans 809,169 950,516 Total loans and leases $ 21,737,878 $ 20,239,990

Allowance for Loan and Lease 38

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [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, 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 Provision (credit) for loan and lease losses 34,870 (1,929 ) 32,941 Loans and leases charged-off (29,587 ) (614 ) (30,201 ) Loans and leases recovered 9,839 — 9,839 Net charge-offs (19,748 ) (614 ) (20,362 ) Balance at December 31, 2016 $ 205,026 $ 13,769 $ 218,795 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: Years ended December 31, 2016, 2015 and 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: Balance at January 1, 2014 $ 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 Provision (credits) 12,871 (21,912 ) 925 14,583 635 877 9,448 (1,234 ) 45 18,632 34,870 Charge-offs (680 ) (987 ) — (9,013 ) (442 ) (144 ) (926 ) (3,287 ) — (14,108 ) (29,587 ) Recoveries 398 1,281 176 1,539 190 539 467 916 66 4,267 9,839 Balance at December 31, 2016 $ 28,877 $ 48,278 $ 3,269 $ 50,225 $ 5,907 $ 3,127 $ 23,094 $ 12,366 $ 1,596 $ 28,287 $ 205,026 December 31, 2016 (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 $ 151 $ 3,488 $ 152 $ 1,732 $ 75 $ 23 $ 2,447 $ 366 $ 109 $ 667 $ 9,210 ALLL for loans and leases collectively evaluated for impairment 28,726 44,790 3,117 48,493 5,832 3,104 20,647 12,000 1,487 27,620 195,816 Total allowance for loan and lease losses $ 28,877 $ 48,278 $ 3,269 $ 50,225 $ 5,907 $ 3,127 $ 23,094 $ 12,366 $ 1,596 $ 28,287 $ 205,026 Loans and leases: Loans and leases individually evaluated for impairment $ 1,045 $ 76,361 $ 1,563 $ 12,600 $ 1,074 $ 142 $ 31,476 $ 7,613 $ 2,613 $ 1,912 $ 136,399 Loans and leases collectively evaluated for impairment 648,112 8,949,859 349,728 2,554,901 825,196 340,122 2,857,648 2,593,731 228,787 1,444,226 20,792,310 Total loan and leases $ 649,157 $ 9,026,220 $ 351,291 $ 2,567,501 $ 826,270 $ 340,264 $ 2,889,124 $ 2,601,344 $ 231,400 $ 1,446,138 $ 20,928,709 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 Years ended December 31, 2016, 2015 and 2014 (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, 2014 $ 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 Provision (credits) (599 ) (1,249 ) (266 ) 59 (209 ) 433 — (98 ) (1,929 ) Charge-offs — (166 ) (5 ) — (371 ) — — (72 ) (614 ) Recoveries — — — — — — — — — Balance at December 31, 2016 $ 483 $ 6,423 $ 502 $ 504 $ 4,818 $ 956 $ — $ 83 $ 13,769 December 31, 2016 ALLL for loans and leases acquired with deteriorated credit quality $ 483 $ 6,423 $ 502 $ 504 $ 4,818 $ 956 $ — $ 83 $ 13,769 Loans and leases acquired with deteriorated credit quality 20,766 453,013 12,645 11,844 268,777 38,650 — 3,474 809,169 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
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, 2016 (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 $ 1,002 $ 43 $ 1,045 $ 1,172 $ 151 Commercial mortgage 42,875 33,486 76,361 82,658 3,488 Other commercial real estate 1,279 284 1,563 1,880 152 Commercial and industrial 8,920 3,680 12,600 16,637 1,732 Lease financing 1,002 72 1,074 1,074 75 Other 142 — 142 233 23 Residential mortgage 20,269 11,207 31,476 32,588 2,447 Revolving mortgage 1,825 5,788 7,613 8,831 366 Construction and land development - noncommercial 645 1,968 2,613 3,030 109 Consumer 1,532 380 1,912 2,086 667 Total non-PCI impaired loans and leases $ 79,491 $ 56,908 $ 136,399 $ 150,189 $ 9,210 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 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, 2016 , 2015 and 2014 : Year ended December 31, 2016 (Dollars in thousands) YTD Average Balance YTD Interest Income Recognized Non-PCI impaired loans and leases: Construction and land development - commercial $ 2,700 $ 138 Commercial mortgage 82,146 2,671 Other commercial real estate 1,112 38 Commercial and industrial 11,878 417 Lease financing 1,307 63 Other 687 33 Residential mortgage 26,774 805 Revolving mortgage 6,915 171 Construction and land development - noncommercial 983 50 Consumer 1,480 80 Total non-PCI impaired loans and leases $ 135,982 $ 4,466 Year ended December 31, 2015 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
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, 2016 December 31, 2015 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans Construction and land development - commercial $ 3,292 $ 308 $ 3,600 $ 3,624 $ 257 $ 3,881 Commercial mortgage 70,263 14,435 84,698 65,812 18,728 84,540 Other commercial real estate 1,635 80 1,715 1,751 89 1,840 Commercial and industrial 9,193 1,436 10,629 8,833 3,341 12,174 Lease financing 882 192 1,074 1,191 169 1,360 Other 64 78 142 1,183 — 1,183 Total commercial loans 85,329 16,529 101,858 82,394 22,584 104,978 Noncommercial Residential mortgage 34,012 5,117 39,129 25,427 7,129 32,556 Revolving mortgage 6,346 1,431 7,777 3,600 1,705 5,305 Construction and land development - noncommercial 240 — 240 784 — 784 Consumer and other 1,603 309 1,912 1,091 129 1,220 Total noncommercial loans 42,201 6,857 49,058 30,902 8,963 39,865 Total loans $ 127,530 $ 23,386 $ 150,916 $ 113,296 $ 31,547 $ 144,843
Troubled Debt Restructurings on Financing Receivables	The following tables provide the types of TDRs made during the year ended December 31, 2016 , and 2015 , as well as a summary of loans that were modified as a TDR during the year ended December 31, 2016 , and 2015 that subsequently defaulted during the year ended December 31, 2016 , and 2015 . 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, 2016 Year ended December 31, 2015 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 2 $ 569 1 $ 326 3 $ 185 — $ — Commercial and industrial — — — — 2 776 — — Residential mortgage 1 122 1 122 — — — — Construction and land development - noncommercial — — — — 1 91 — — Total interest only 3 691 2 448 6 1,052 — — Loan term extension Construction and land development - commercial 1 40 1 40 1 18 1 18 Commercial mortgage 7 2,428 — — 12 3,144 2 316 Other commercial real estate 1 747 — — — — — — Commercial and industrial 8 1,070 — — 5 1,380 — — Lease financing — — — — 4 146 — — Residential mortgage 15 2,183 — — 1 110 — — Revolving mortgage — — — — 1 8 — — Construction and land development - noncommercial 2 421 — — — — — — Consumer 3 30 — — 3 52 — Total loan term extension 37 6,919 1 40 27 4,858 3 334 Below market interest rate Construction and land development - commercial 6 231 1 — 21 992 3 122 Commercial mortgage 45 12,030 16 1,986 37 13,900 3 3,969 Commercial and industrial 34 3,056 11 1,144 15 2,301 2 1,619 Other commercial real estate 3 619 — — 2 122 — — Lease financing 4 152 4 152 — — — — Residential mortgage 185 11,087 48 2,583 116 5,695 14 607 Revolving mortgage 5 106 — — 6 136 — — Construction & land development - noncommercial 15 676 4 96 2 253 — — Consumer 10 222 2 15 18 146 2 10 Other 2 120 1 78 1 1,183 — — Total below market interest rate 309 28,299 87 6,054 218 24,728 24 6,327 Discharged from bankruptcy Construction and land development - commercial 1 22 1 22 4 38 1 3 Commercial mortgage 4 347 2 73 4 1,897 2 644 Commercial and industrial 6 83 — — 3 146 — — Lease financing 1 84 — — — — — — Residential mortgage 22 773 14 326 29 1,454 4 242 Revolving mortgage 51 3,043 13 345 56 2,714 9 701 Consumer 69 770 23 250 25 296 7 75 Total discharged from bankruptcy 154 5,122 53 1,016 121 6,545 23 1,665 Total non-PCI restructurings 503 $ 41,031 143 $ 7,558 372 $ 37,183 50 $ 8,326 Year ended December 31, 2016 Year ended December 31, 2015 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 Loan term extension Residential mortgage — $ — — $ — 1 $ 178 — $ — Total loan term extension — — — — 1 178 — — Below market interest rate Construction and land development - commercial 1 52 — — — — — — Commercial mortgage 4 3,255 — — — — — — Residential mortgage 3 172 — — 14 1,187 2 96 Total below market interest rate 8 3,479 — — 14 1,187 2 96 Discharged from bankruptcy Commercial mortgage 2 2,965 1 3 — — — — Residential mortgage — — — — 2 282 — — Revolving mortgage — — — — 1 105 — — Total discharged from bankruptcy 2 2,965 1 3 3 387 — — Total PCI restructurings 10 $ 6,444 1 $ 3 18 $ 1,752 2 $ 96

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Major classifications of premises and equipment at December 31, 2016 and 2015 are summarized as follows: (Dollars in thousands) 2016 2015 Land $ 285,612 $ 279,932 Premises and leasehold improvements 1,130,650 1,089,644 Furniture and equipment 443,560 441,378 Total 1,859,822 1,810,954 Less accumulated depreciation and amortization 726,778 675,125 Total premises and equipment $ 1,133,044 $ 1,135,829
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, 2016 : (Dollars in thousands) Year ended December 31 2017 $ 26,068 2018 22,000 2019 13,295 2020 7,081 2021 6,114 Thereafter 43,133 Total minimum payments $ 117,691

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Changes in Other Real Estate Owned	The following table explains changes in other real estate owned during 2016 and 2015 . (Dollars in thousands) Covered Noncovered Total Balance at January 1, 2015 $ 22,982 $ 70,454 $ 93,436 Additions 7,357 47,866 55,223 Sales (19,629 ) (56,853 ) (76,482 ) Write-downs (1,478 ) (5,140 ) (6,618 ) Transfers (1) (2,415 ) 2,415 — Balance at December 31, 2015 6,817 58,742 65,559 Additions 4,888 30,384 35,272 Additions acquired in the Cordia acquisition — 1,170 1,170 Additions acquired in the FCSB acquisition — 375 375 Sales (937 ) (33,241 ) (34,178 ) Write-downs (580 ) (6,387 ) (6,967 ) Transfers (1) (9,716 ) 9,716 — Balance at December 31, 2016 $ 472 $ 60,759 $ 61,231 (1) Transfers include OREO balances associated with expired or terminated shared-loss agreements. At December 31, 2016 and December 31, 2015 , BancShares had $15.0 million and $16.1 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 $21.8 million and $15.6 million at December 31, 2016 and December 31, 2015 , respectively.

FDIC Shared-Loss Receivable and

FDIC Shared-Loss Receivable and Payable (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 and 2014 : Year ended December 31 (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 4,054 $ 28,701 $ 93,397 Additional receivable from Bancorporation merger — — 5,106 Amortization (4,734 ) (10,899 ) (43,422 ) Net cash payments to the FDIC 21,059 33,296 1,286 Post-acquisition adjustments (14,745 ) (47,044 ) (27,666 ) Termination of FDIC shared-loss agreements (1,462 ) — — Balance at December 31 $ 4,172 $ 4,054 $ 28,701

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	Deposits at December 31 are summarized as follows: (Dollars in thousands) 2016 2015 Demand $ 10,130,549 $ 9,274,470 Checking with interest 4,919,727 4,445,353 Money market accounts 8,193,392 8,205,705 Savings 2,099,579 1,909,021 Time 2,818,096 3,096,206 Total deposits $ 28,161,343 $ 26,930,755
Maturities Of Time Deposits	At December 31, 2016 , the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2017 $ 1,984,571 2018 435,823 2019 175,359 2020 154,294 2021 68,046 Thereafter 3 Total time deposits $ 2,818,096

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Abstract]
Schedule of Short-term Debt	Short-term borrowings at December 31 are as follows: (Dollars in thousands) 2016 2015 Repurchase agreements $ 590,772 $ 592,182 Notes payable to Federal Home Loan Banks 10,000 — Federal funds purchased 2,551 2,551 Unamortized purchase accounting adjustments 164 — Total short-term borrowings $ 603,487 $ 594,733

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2016
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 the Consolidated Balance Sheets as of December 31, 2016 and December 31, 2015 is presented in the following tables. December 31, 2016 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 $ 590,772 $ — $ — $ 30,000 $ 620,772 Government agency — — — — — Total borrowings $ 590,772 $ — $ — $ 30,000 $ 620,772 Gross amount of recognized liabilities for repurchase agreements $ 620,772 December 31, 2015 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 $ 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

Long-Term Obligations (Tables)

Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2016
Long-term Obligations [Abstract]
Schedule of Long-term Debt Instruments	ong-term obligations at December 31 include: (Dollars in thousands) 2016 2015 Junior subordinated debenture at 3-month LIBOR plus 1.75 percent maturing June 30, 2036 $ 90,207 $ 96,392 Junior subordinated debenture at 3-month LIBOR plus 2.25 percent maturing June 15, 2034 24,742 25,774 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 5,701 9,226 Notes payable to Federal Home Loan Bank of Atlanta with rates ranging from 2.00 percent to 3.58 percent and maturing through August 2024 660,237 510,252 Note payable to the Federal Home Loan Bank of Des Moines with a rate of 4.74 percent and a maturity date of July 2017 — 10,000 Unamortized purchase accounting adjustments (3,350 ) (2,907 ) Other long-term debt 30,095 30,108 Total long-term obligations $ 832,942 $ 704,155
Schedule of Maturities of Long-term Debt	Long-term obligations maturing in each of the five years subsequent to December 31, 2016 and thereafter include: Year ended December 31 2017 $ 3,232 2018 135,652 2019 241 2020 255 2021 70,271 Thereafter 623,291 Total long-term obligations $ 832,942

Estimated Fair Values (Tables)

Estimated Fair Values (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and December 31, 2015 . 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 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 shared-loss agreements is designated as Level 3. December 31, 2016 December 31, 2015 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 539,741 $ 539,741 $ 534,086 $ 534,086 Overnight investments 1,872,594 1,872,594 2,063,132 2,063,132 Investment securities available for sale 7,006,580 7,006,580 6,861,293 6,861,293 Investment securities held to maturity 98 104 255 265 Loans held for sale 74,401 74,401 59,766 59,766 Net loans and leases 21,519,083 20,614,548 20,033,774 19,353,325 Receivable from the FDIC for shared-loss agreements 4,172 4,172 4,054 4,054 Income earned not collected 79,839 79,839 70,036 70,036 Federal Home Loan Bank stock 43,495 43,495 37,511 37,511 Mortgage servicing rights 20,415 24,446 19,351 19,495 Deposits 28,161,343 28,135,698 26,930,755 26,164,472 Short-term borrowings 603,487 603,487 594,733 594,733 Long-term obligations 832,942 832,201 704,155 718,102 FDIC shared-loss payable 97,008 100,069 126,453 131,894 Accrued interest payable 3,797 3,797 5,713 5,713 Interest rate swap (1) — — 1,429 1,429 (1) The interest rate swap agreement expired in June 2016.
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 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, 2016 and December 31, 2015 . December 31, 2016 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 $ 1,650,319 $ — $ 1,650,319 $ — Government agency 40,398 — 40,398 — Mortgage-backed securities 5,175,425 — 5,175,425 — Equity securities 83,507 29,145 54,362 — Corporate bonds 49,562 — 49,562 — Other 7,369 — 7,369 — Total investment securities available for sale $ 7,006,580 $ 29,145 $ 6,977,435 $ — Loans held for sale $ 74,401 $ — $ 74,401 $ — December 31, 2015 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 $ 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 — Corporate bonds 8,500 — 8,500 — Other 2,160 — 2,160 — 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 $ —
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, 2016 and 2015 . December 31, 2016 (Dollars in thousands) Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 74,401 $ 75,893 $ (1,492 ) December 31, 2015 Fair Value Aggregate Unpaid Principal Balance Difference Loans held for sale $ 59,766 $ 58,890 $ 876 No loans held for sale were 90 or more days past due or on nonaccrual status as of December 31, 2016 and 2015 . 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, 2016 and 2015 . Year ended December 31 (Dollars in thousands) 2016 2015 (Losses) gains from fair value changes on loans held for sale $ (2,368 ) $ 176
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, 2016 and December 31, 2015 . December 31, 2016 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Impaired loans $ 70,977 $ — $ — $ 70,977 Other real estate not covered under shared-loss agreements remeasured during current year 44,963 — — 44,963 Other real estate covered under shared-loss agreements remeasured during current year 439 — — 439 Mortgage servicing rights 342 — — 342 December 31, 2015 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Impaired loans $ 64,197 $ — $ — $ 64,197 Other real estate not covered under shared-loss agreements remeasured during current year 44,571 — — 44,571 Other real estate covered under shared-loss agreements remeasured during current year 4,403 — — 4,403 Mortgage servicing rights 17,997 — — 17,997

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive loss included the following at December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Unrealized losses on investment securities available for sale $ (72,707 ) $ (26,832 ) $ (45,875 ) $ (24,504 ) $ (9,379 ) $ (15,125 ) Unrealized loss on cash flow hedge — — — (1,429 ) (537 ) (892 ) Funded status of defined benefit plan (141,774 ) (52,457 ) (89,317 ) (78,419 ) (29,996 ) (48,423 ) Total $ (214,481 ) $ (79,289 ) $ (135,192 ) $ (104,352 ) $ (39,912 ) $ (64,440 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2016 and 2015 : (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, 2015 $ 5,098 $ (2,664 ) $ (55,415 ) $ (52,981 ) Other comprehensive (loss) income 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 ) Other comprehensive (loss) income before reclassifications (13,946 ) 892 (45,347 ) (58,401 ) Amounts reclassified from accumulated other comprehensive (loss) income (16,804 ) — 4,453 (12,351 ) Net current period other comprehensive (loss) income (30,750 ) 892 (40,894 ) (70,752 ) Balance at December 31, 2016 $ (45,875 ) $ — $ (89,317 ) $ (135,192 ) (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 each plan: (Dollars in thousands) BancShares Plan Bancorporation Plan 2017 $ 23,932 $ 6,227 2018 25,377 6,618 2019 26,868 6,903 2020 28,499 7,287 2021 30,193 7,821 2022-2025 176,048 45,713
Deferred Benefit Plans Liability Rollforward	The following table provides the accrued liability as of December 31, 2016 and 2015 , and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2016 2015 Present value of accrued liability as of January 1 $ 39,878 $ 43,211 Benefit expense and interest cost 3,232 1,386 Benefits paid (4,194 ) (4,485 ) Benefits forfeited (319 ) (234 ) Present value of accrued liability as of December 31 $ 38,597 $ 39,878 Discount rate at December 31 4.30 % 4.68 %
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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Change in benefit obligation Projected benefit obligation at January 1 $ 611,502 $ 627,645 Service cost 12,618 14,083 Interest cost 28,892 26,975 Actuarial loss (gain) 40,571 (39,002 ) Benefits paid (20,356 ) (18,199 ) Projected benefit obligation at December 31 673,227 611,502 Change in plan assets Fair value of plan assets at January 1 550,025 544,956 Actual return on plan assets 20,947 (6,732 ) Employer contributions 50,000 30,000 Benefits paid (20,356 ) (18,199 ) Fair value of plan assets at December 31 600,616 550,025 Funded status at December 31 $ (72,611 ) $ (61,477 )
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets at December 31, 2016 and 2015 consist of: (Dollars in thousands) 2016 2015 Other assets $ — $ — Other liabilities (72,611 ) (61,477 ) Net liability recognized $ (72,611 ) $ (61,477 )
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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Net loss $ 119,766 $ 70,358 Less prior service cost 347 556 Accumulated other comprehensive loss, excluding income taxes $ 120,113 $ 70,914
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The following table provides expected amortization amounts for 2017 . (Dollars in thousands) Actuarial loss $ 8,938 Prior service cost 210 Total $ 9,148
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, 2016, 2015 and 2014 . Year ended December 31 (Dollars in thousands) 2016 2015 2014 Service cost $ 12,618 $ 14,083 $ 12,332 Interest cost 28,892 26,975 25,615 Expected return on assets (36,643 ) (33,198 ) (31,269 ) Amortization of prior service cost 210 210 210 Amortization of net actuarial loss 6,859 11,376 5,148 Total net periodic benefit cost 11,936 19,446 12,036 Current year actuarial loss 56,268 927 69,349 Amortization of actuarial loss (6,859 ) (11,376 ) (5,148 ) Amortization of prior service cost (210 ) (210 ) (210 ) Total recognized in other comprehensive income 49,199 (10,659 ) 63,991 Total recognized in net periodic benefit cost and other comprehensive income $ 61,135 $ 8,787 $ 76,027
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations at December 31, 2016 and 2015 are as follows: (Dollars in thousands) 2016 2015 Discount rate 4.30 % 4.68 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 , are as follows: (Dollars in thousands) 2016 2015 2014 Discount rate 4.68 % 4.27 % 4.90 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 7.50 7.50
Schedule of Fair Value and Allocation of Plan Assets	BancShares Plan The fair values of pension plan assets at December 31, 2016 and 2015 , by asset class are as follows: December 31, 2016 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 60,674 $ 60,674 — — 0 - 1% 10 % Equity securities 30 - 70% 54 % Common and preferred stock 66,015 65,964 51 — Mutual funds 256,976 252,710 4,266 — Fixed income 15 - 45% 28 % U.S. government and government agency securities 57,890 47,647 10,243 — Corporate bonds 68,198 — 68,198 — Mutual funds 42,849 42,849 — — Alternative investments 0 - 30% 8 % Mutual funds 48,014 48,014 — — Total pension assets $ 600,616 $ 517,858 $ 82,758 $ — 100 % December 31, 2015 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 %
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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Change in benefit obligation Projected benefit obligation at January 1 $ 143,241 $ 151,332 Service cost 2,567 3,341 Interest cost 6,775 6,393 Actuarial loss (gain) 9,682 (10,937 ) Benefits paid (5,434 ) (4,812 ) Curtailments — (2,076 ) Projected benefit obligation at December 31 156,831 143,241 Change in plan assets Fair value of plan assets at January 1 150,893 155,618 Actual return on plan assets 6,625 87 Benefits paid (5,434 ) (4,812 ) Fair value of plan assets at December 31 152,084 150,893 Funded status at December 31 $ (4,747 ) $ 7,652
Schedule of Amounts Recognized in the Balance Sheets	The amounts recognized in the consolidated balance sheets at December 31, 2016 and 2015 consist of: (Dollars in thousands) 2016 2015 Other assets $ — $ — Other liabilities (4,747 ) 7,652 Net asset (liability) recognized $ (4,747 ) $ 7,652
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, 2016 and 2015 . (Dollars in thousands) 2016 2015 Net loss $ 21,661 $ 7,505 Less prior service cost — — Accumulated other comprehensive loss, excluding income taxes $ 21,661 $ 7,505
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The following table provides expected amortization amounts for 2017 . (Dollars in thousands) Actuarial loss $ 855 Prior service cost — Total $ 855
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, 2016 and 2015 . For 2014, the table only includes amounts after the October 1 acquisition of Bancorporation. Year ended December 31 (Dollars in thousands) 2016 2015 2014 Service cost $ 2,567 $ 3,341 $ 832 Interest cost 6,775 6,393 1,488 Expected return on assets (11,101 ) (11,482 ) (2,807 ) Total net periodic benefit cost (1,759 ) (1,748 ) (487 ) Current year actuarial loss 14,157 458 9,123 Curtailments — (2,076 ) — Total recognized in other comprehensive income 14,157 (1,618 ) 9,123 Total recognized in net periodic benefit cost and other comprehensive income $ 12,398 $ (3,366 ) $ 8,636
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations at December 31, 2016 and 2015 are as follows: (Dollars in thousands) 2016 2015 Discount rate 4.30 % 4.68 % Rate of compensation increase 4.00 4.00 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 are as follows: (Dollars in thousands) 2016 2015 2014 Discount rate 4.68 % 4.27 % 4.35 % Rate of compensation increase 4.00 4.00 4.00 Expected long-term return on plan assets 7.50 7.50 7.50
Schedule of Fair Value and Allocation of Plan Assets	December 31, 2016 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 3,839 $ 3,839 $ — $ — 0 - 1% 2 % Equity securities 30 - 70% 58 % Common and preferred stock 18,274 18,260 14 — Mutual funds 69,978 68,832 1,146 — Fixed income 15 - 45% 31 % U.S. government and government agency securities 15,407 8,919 6,488 — Corporate bonds 19,496 — 19,496 — Mutual funds 11,822 11,822 — — Alternative investments 0 - 30% 9 % Mutual funds 13,268 13,268 — — Total pension assets $ 152,084 $ 124,940 $ 27,144 — December 31, 2015 Market Value Quoted prices in Significant Significant Target Allocation (1) 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 —

Other Noninterest Income and 48

Other Noninterest Income and Other Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2016
Noninterest Expense [Abstract]
Schedule of Other Operating Cost and Expense, by Component	(Dollars in thousands) 2016 2015 2014 Collection $ 8,889 $ 9,649 $ 11,595 Processing fees paid to third parties 18,976 18,779 17,089 Cardholder reward programs 10,615 11,069 8,252 Telecommunications 14,496 14,406 10,834 Consultant 10,931 8,925 10,168 Core deposit intangible amortization 16,851 18,892 6,955 Advertising 10,239 12,431 11,461 Other 109,050 95,741 76,481 Total other noninterest expense $ 200,047 $ 189,892 $ 152,835

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2014 Current tax expense Federal $ 84,946 $ 105,367 $ 84,430 State 7,493 16,111 13,941 Total current tax expense 92,439 121,478 98,371 Deferred tax expense (benefit) Federal 23,144 (2,758 ) (30,658 ) State 10,002 3,308 (2,681 ) Total deferred tax (benefit) expense 33,146 550 (33,339 ) Total income tax expense $ 125,585 $ 122,028 $ 65,032
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) 2016 2015 2014 Income taxes at federal statutory rates $ 122,874 $ 116,345 $ 71,258 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (2,901 ) (3,020 ) (1,832 ) State and local income taxes, including change in valuation allowance, net of federal income tax benefit 11,372 12,622 7,319 Acquisition stock settlement (98 ) — (10,185 ) Tax credits net of amortization (4,138 ) (3,060 ) (2,896 ) Other, net (1,524 ) (859 ) 1,368 Total income tax expense $ 125,585 $ 122,028 $ 65,032
Schedule of Deferred Tax Assets and Liabilities	The net deferred tax asset included the following components at December 31 : (Dollars in thousands) 2016 2015 Allowance for loan and lease losses $ 80,939 $ 78,878 Pension liability 15,679 7,206 Executive separation from service agreements 14,278 9,856 State net operating loss carryforward — 21 Federal net operating loss carryforward from Cordia acquisition 5,019 — Unrealized loss on cash flow hedge — 537 Net unrealized loss on securities included in accumulated other comprehensive loss 26,832 9,379 Accelerated depreciation 133 13,195 FDIC assisted transactions timing differences 52,579 66,456 Other reserves 10,504 10,772 Other 26,663 29,279 Deferred tax asset 232,626 225,579 Lease financing activities 11,651 15,492 Net deferred loan fees and costs 10,867 6,051 Intangible assets 6,335 2,040 Security, loan and debt valuations 22,656 31,486 Other 8,501 12,026 Deferred tax liability 60,010 67,095 Net deferred tax asset $ 172,616 $ 158,484
Schedule of Unrecognized Tax Benefits	The following table provides a rollforward of Bancshares’ gross unrecognized tax benefits, excluding interest and penalties, during the years ended December 31 : (Dollars in thousands) 2016 2015 2014 Unrecognized tax benefits at the beginning of the year $ 5,975 $ 3,865 $ 2,823 Reductions related to tax positions taken in prior year (327 ) (79 ) — Additions related to tax positions taken in current year 23,231 2,189 1,042 Settlements — — — Unrecognized tax benefits at the end of the year $ 28,879 $ 5,975 $ 3,865

Transactions with Related Per50

Transactions with Related Persons (Tables)	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	For those identified as Related Persons as of December 31, 2016 , the following table provides an analysis of changes in the loans outstanding during 2016 and 2015 : Year ended December 31 (dollars in thousands) 2016 2015 Balance at January 1 $ 79 $ 1,045 New loans 314 5 Repayments (40 ) (971 ) Balance at December 31 $ 353 $ 79

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative [Line Items]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive loss included the following at December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Unrealized losses on investment securities available for sale $ (72,707 ) $ (26,832 ) $ (45,875 ) $ (24,504 ) $ (9,379 ) $ (15,125 ) Unrealized loss on cash flow hedge — — — (1,429 ) (537 ) (892 ) Funded status of defined benefit plan (141,774 ) (52,457 ) (89,317 ) (78,419 ) (29,996 ) (48,423 ) Total $ (214,481 ) $ (79,289 ) $ (135,192 ) $ (104,352 ) $ (39,912 ) $ (64,440 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2016 and 2015 : (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, 2015 $ 5,098 $ (2,664 ) $ (55,415 ) $ (52,981 ) Other comprehensive (loss) income 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 ) Other comprehensive (loss) income before reclassifications (13,946 ) 892 (45,347 ) (58,401 ) Amounts reclassified from accumulated other comprehensive (loss) income (16,804 ) — 4,453 (12,351 ) Net current period other comprehensive (loss) income (30,750 ) 892 (40,894 ) (70,752 ) Balance at December 31, 2016 $ (45,875 ) $ — $ (89,317 ) $ (135,192 ) (1) All amounts are net of tax. Amounts in parentheses indicate debits.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill [Line Items]
Changes in Goodwill	The following table presents the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 : (Dollars in thousands) 2016 2015 Balance at January 1 $ 139,773 $ 139,773 Acquired in the Cordia merger 10,828 — Balance at December 31 $ 150,601 $ 139,773
Mortgage Servicing Rights Key Economic Assumptions Used to Value	Key economic assumptions used to value mortgage servicing rights as of December 31, 2016 and 2015 were as follows: 2016 2015 Discount rate - conventional fixed loans 9.45 % 9.31 % Discount rate - all loans excluding conventional fixed loans 10.45 % 10.31 % Weighted average constant prepayment rate 10.42 % 11.01 % Weighted average cost to service a loan $ 62.75 $ 56.61
Schedule of Mortgage Servicing Rights at Amortized Cost	The activity of the servicing asset for the years ended December 31, 2016 , 2015 and 2014 is presented in the following table: (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 19,351 $ 16,688 $ 16 Servicing rights originated 5,931 5,910 727 Amortization (4,958 ) (4,002 ) (919 ) Servicing rights acquired in the 1st Financial acquisition — — 148 Servicing rights acquired in the Bancorporation merger — — 17,566 Valuation allowance reversal (provision) 91 755 (850 ) Balance at December 31 $ 20,415 $ 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, 2016 , 2015 and 2014 : (Dollars in thousands) 2016 2015 2014 Balance at January 1 $ 95 $ 850 $ — Valuation allowance (reversal) provision (91 ) (755 ) 850 Balance at December 31 $ 4 $ 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) 2016 2015 Balance at January 1 $ 71,635 $ 89,922 Acquired in the CCBT acquisition — 690 Acquired in the NMSB acquisition 240 — Acquired in the FCSB acquisition 390 — Acquired in the Cordia acquisition 2,210 — Removal due to branch sale — (85 ) Amortization (16,850 ) (18,892 ) Balance at December 31 $ 57,625 $ 71,635 Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2016 and 2015 . During 2016, BancShares recognized $240 thousand , $390 thousand and $2.2 million in core deposit intangibles related to the NMSB, FCSB and Cordia acquisitions, respectively. 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. 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, 2016 and 2015 , are: (Dollars in thousands) 2016 2015 Gross balance $ 118,041 $ 115,201 Accumulated amortization (60,416 ) (43,566 ) Carrying value $ 57,625 $ 71,635
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) 2017 $ 14,556 2018 12,220 2019 9,892 2020 7,838 2021 5,996

Shareholders' Equity, Dividen53

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	Following is an analysis of capital ratios under Basel III guidelines for BancShares and FCB as of December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Amount Ratio Requirements to be well-capitalized Amount Ratio Requirements to be well-capitalized BancShares Tier 1 risk-based capital $ 2,995,557 12.42 % 8.00 % $ 2,831,242 12.65 % 8.00 % Common equity Tier 1 2,995,557 12.42 6.50 2,799,163 12.51 6.50 Total risk-based capital 3,339,986 13.85 10.00 3,140,212 14.03 10.00 Leverage capital 2,995,557 9.05 5.00 2,831,242 8.96 5.00 FCB Tier 1 risk-based capital 2,942,829 12.25 8.00 2,821,475 12.64 8.00 Common equity Tier 1 2,942,829 12.25 6.50 2,821,475 12.64 6.50 Total risk-based capital 3,172,757 13.21 10.00 3,038,070 13.61 10.00 Leverage capital 2,942,829 8.94 5.00 2,821,475 8.95 5.00

Accumulated Other Comprehensi54

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive loss included the following at December 31, 2016 and 2015 : December 31, 2016 December 31, 2015 (Dollars in thousands) Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Accumulated other comprehensive loss Deferred tax benefit Accumulated other comprehensive loss, net of tax Unrealized losses on investment securities available for sale $ (72,707 ) $ (26,832 ) $ (45,875 ) $ (24,504 ) $ (9,379 ) $ (15,125 ) Unrealized loss on cash flow hedge — — — (1,429 ) (537 ) (892 ) Funded status of defined benefit plan (141,774 ) (52,457 ) (89,317 ) (78,419 ) (29,996 ) (48,423 ) Total $ (214,481 ) $ (79,289 ) $ (135,192 ) $ (104,352 ) $ (39,912 ) $ (64,440 ) The following table highlights changes in accumulated other comprehensive (loss) income by component for the years ended December 31, 2016 and 2015 : (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, 2015 $ 5,098 $ (2,664 ) $ (55,415 ) $ (52,981 ) Other comprehensive (loss) income 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 ) Other comprehensive (loss) income before reclassifications (13,946 ) 892 (45,347 ) (58,401 ) Amounts reclassified from accumulated other comprehensive (loss) income (16,804 ) — 4,453 (12,351 ) Net current period other comprehensive (loss) income (30,750 ) 892 (40,894 ) (70,752 ) Balance at December 31, 2016 $ (45,875 ) $ — $ (89,317 ) $ (135,192 ) (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, 2016 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 $ 26,673 Securities gains (9,869 ) Income taxes $ 16,804 Net income Amortization of defined benefit pension items Prior service costs $ (210 ) Employee benefits Actuarial losses (6,859 ) Employee benefits (7,069 ) Employee benefits 2,616 Income taxes $ (4,453 ) Net income Total reclassifications for the period $ 12,351 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 (1) Amounts in parentheses indicate debits to profit/loss.

Parent Company Financial Stat55

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Parent Company Condensed Balance Sheets (Dollars in thousands) December 31, 2016 December 31, 2015 Assets Cash $ 8,278 $ 24,869 Overnight investments 26,157 1,416 Investment securities available for sale 95,564 21,137 Investment in banking subsidiaries 2,932,048 2,874,581 Investment in other subsidiaries 41,066 43,117 Other assets 92,787 73,944 Total assets $ 3,195,900 $ 3,039,064 Liabilities and Shareholders' Equity Long-term obligations $ 126,861 $ 133,775 Due to subsidiaries 56,323 29,682 Other liabilities 289 3,498 Shareholders' equity 3,012,427 2,872,109 Total liabilities and shareholders' equity $ 3,195,900 $ 3,039,064
Condensed Income Statements	Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2016 2015 2014 Interest income $ 1,110 $ 645 $ 1,784 Interest expense 6,067 6,793 9,694 Net interest loss (4,957 ) (6,148 ) (7,910 ) Dividends from banking subsidiaries 90,055 75,006 82,419 Dividends from other subsidiaries — 23,500 — Other income 9,330 1,870 33,600 Other operating expense 5,641 2,634 6,534 Income before income tax benefit and equity in undistributed net income of subsidiaries 88,787 91,594 101,575 Income tax benefit (730 ) (2,618 ) (2,590 ) Income before equity in undistributed net income of subsidiaries 89,517 94,212 104,165 Equity in undistributed net income of subsidiaries 135,965 116,174 34,397 Net income $ 225,482 $ 210,386 $ 138,562
Condensed Statements of Cash Flows	Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2016 2015 2014 OPERATING ACTIVITIES Net income $ 225,482 $ 210,386 $ 138,562 Adjustments Undistributed net income of subsidiaries (135,965 ) (116,174 ) (34,397 ) Net amortization of premiums and discounts (6,838 ) (2,712 ) 594 Securities gains (9,446 ) (236 ) (29,126 ) Gain on elimination of acquired debt — — (1,988 ) Change in other assets (20,845 ) (3,070 ) 93,385 Change in other liabilities (1,780 ) (1,157 ) 2,250 Net cash provided by operating activities 50,608 87,037 169,280 INVESTING ACTIVITIES Net change in due from subsidiaries — 295,994 (150,328 ) Net change in overnight investments (24,741 ) (1,416 ) — Purchases of investment securities (93,003 ) (7,818 ) (33,243 ) Proceeds from sales, calls, and maturities of securities 38,316 100,586 114,208 Investment in subsidiaries — — 1,579 Business acquisitions, net of cash acquired — — (24,772 ) Net cash (used) provided by investing activities (79,428 ) 387,346 (92,556 ) FINANCING ACTIVITIES Net change in due to subsidiaries 26,641 29,682 — Net change in short-term borrowings — (485,207 ) (1,211 ) Retirement of long-term obligations — — (52,372 ) Stock issuance costs — — (619 ) Cash dividends paid (14,412 ) (18,015 ) (11,543 ) Net cash provided (used) by financing activities 12,229 (473,540 ) (65,745 ) Net change in cash (16,591 ) 843 10,979 Cash balance at beginning of year 24,869 24,026 13,047 Cash balance at end of year $ 8,278 $ 24,869 $ 24,026

Summary of Significant Accounti

Summary of Significant Accounting Policies (Details)	Sep. 02, 2016USD ($)	Dec. 31, 2016USD ($)votebranch	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 01, 2016$ / shares
Property, Plant and Equipment [Line Items]
Net impact from FDIC shared-loss termination		$ 16,559,000	$ 0	$ 0
Gain on acquisitions		5,831,000	42,930,000	$ 0
Nonmarketable Securities and Federal Home Loan Bank Stock		$ 43,800,000	37,700,000
Period fair values are subject to refinement		1 year
Number of branches | branch		550
Net deferred fees on non-PCI loans		$ 6,700,000	16,600,000
Baseline for measurement		500,000
Securities Sold under Agreements to Repurchase		620,772,000	622,182,000
Short-term borrowings		603,487,000	594,733,000
Amortization Method Qualified Affordable Housing Project Investments		$ 109,800,000	$ 85,600,000
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
Cordia Bancorp Inc.
Property, Plant and Equipment [Line Items]
Business Acquisition, Share Price | $ / shares					$ 5.15
Total purchase price	$ 37,053,000

Businss Combinations (Details)

Businss Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 02, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 01, 2016	May 06, 2016	Mar. 11, 2016	Feb. 13, 2015
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 80,690	$ 154,496
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value						$ 241,392
FDIC Indemnification Asset, Acquisitions			0	0	$ 5,106
Gain on acquisitions			5,831	42,930	0
Merger-related expenses			5,341	14,174	13,064
Goodwill			150,601	139,773	$ 139,773
Cordia Bancorp Inc.
Business Acquisition [Line Items]
Business Acquisition, Share Price						$ 5.15
Total purchase price	$ 37,053
Cash and due from banks						$ 8,383
Overnight investments						3,081
Investment securities						76,633
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value						241,392
Premises and equipment						4,151
Other real estate owned						1,170
Income earned not collected						1,990
Other intangible assets						2,210
Other assets						10,318
Total assets acquired						349,328
Deposits						292,192
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Funds Purchased						30,164
Other liabilities						747
Total liabilities assumed						323,103
Fair value of net assets (liabilities) acquired						26,225
Goodwill acquired			10,828	0
Revenue of acquired business			4,226
Merger-related expenses			3,810
Goodwill						$ 10,828
Capitol City Bank and Trust
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value									$ 154,496
Other intangible assets									690
Total assets acquired									211,935
Deposits									266,352
Gain on acquisitions				42,930
Bargain Purchase After Tax Gain				26,400
Total liabilities assumed									272,520
Fair value of net assets (liabilities) acquired									(60,585)
Business Combination Cash Received From FDIC In Acquisition									$ 103,515
Revenue of acquired business				8,300
Merger-related expenses				$ 1,900
First CornerStone Bank
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value							$ 43,776
Cash and due from banks							748
Overnight investments							37,540
Investment securities							4,564
Other real estate owned							375
Income earned not collected							8
Other intangible assets							390
Other assets							13
Total assets acquired							87,414
Deposits							96,882
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period		$ 837	837
Gain on acquisitions			2,959
Other liabilities							23
Total liabilities assumed							96,905
Fair value of net assets (liabilities) acquired							(9,491)
Business Combination Cash Received From FDIC In Acquisition							$ 12,450
Revenue of acquired business			1,600
Merger-related expenses			1,000
North Milwaukee State Bank
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value								$ 36,914
Cash and due from banks								4,545
Overnight investments								2,274
Investment securities								9,425
Other intangible assets								240
Other assets								216
Total assets acquired								53,614
Deposits								59,206
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Funds Purchased								1,662
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period			1,200
Gain on acquisitions			2,872
Other liabilities								74
Total liabilities assumed								60,942
Fair value of net assets (liabilities) acquired								7,328
Business Combination Cash Received From FDIC In Acquisition								$ 10,200
Revenue of acquired business			1,900
Merger-related expenses			$ 500

Investments (Aggregate Values a

Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	$ 362,351	$ 280,126
Investment securities available for sale
Cost	7,079,287	6,885,797
Gross Unrealized Gains	15,324	6,367
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	88,031	30,871
Fair Value	7,006,580	6,861,293
Investment securities held to maturity
Cost	98	255
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,689	6,094
U. S. Treasury
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	0	0
Investment securities available for sale
Cost	1,650,675	1,675,996
Gross Unrealized Gains	579	4
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	935	1,118
Fair Value	1,650,319	1,674,882
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Government Agency
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more		0
Investment securities available for sale
Cost	40,291	498,804
Gross Unrealized Gains	107	230
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	374
Fair Value	40,398	498,660
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Mortgage Backed Securities, Other
Schedule of Investments [Line Items]
Aggregate fair value, continuous unrealized loss position, 12 months or more	362,351	280,126
Investment securities available for sale
Cost	5,259,466	4,692,447
Gross Unrealized Gains	2,809	5,120
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	86,850	29,369
Fair Value	5,175,425	4,668,198
Investment securities held to maturity
Cost	98	255
Held To Maturity Securities Accumulated Unrecognized Holding Gain	6	10
Held To Maturity Securities Accumulated Unrecognized Holding Loss	0	0
Fair Value	104	265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,689	6,094
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	71,873	7,935
Gross Unrealized Gains	11,634	968
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	10
Fair Value	83,507	8,893
Investment securities held to maturity
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Corporate Bonds
Investment securities available for sale
Cost	49,367	8,500
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	195	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fair Value	49,562	8,500
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	7,615	2,115
Gross Unrealized Gains	0	45
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	246	0
Fair Value	7,369	$ 2,160
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, 2016	Dec. 31, 2015
Investment securities available for sale
Total investment securities available for sale, cost	$ 7,079,287	$ 6,885,797
Investment securities available for sale	7,006,580	6,861,293
Investment securities held to maturity
Investment securities held to maturity	98	255
Debt Securities
Investment securities available for sale
Maturing in one year or less, cost	842,798	1,255,714
Maturing in one through five years, cost	848,168	919,086
Maturing in five through ten years, cost	49,367	8,500
Maturing in over ten years, cost	7,615	2,115
Maturing in one year or less, fair value	842,947	1,255,094
Maturing in one through five years, fair value	847,770	918,448
Maturing in five through ten years, fair value	49,562	8,500
Maturing in over ten years, fair value	7,369	2,160
Equity Securities
Investment securities available for sale
Total investment securities available for sale, cost	71,873	7,935
Investment securities available for sale	83,507	8,893
Mortgage Backed Securities, Other
Investment securities available for sale
Total investment securities available for sale, cost	5,259,466	4,692,447
Investment securities available for sale	5,175,425	4,668,198
Investment securities held to maturity
Investment securities held to maturity	98	255
Fair Value	$ 104	$ 265

Investments (Securities Gains (

Investments (Securities Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Gross gains on sales of investment securities available for sale	$ 27,104	$ 10,834	$ 29,129
Gross losses on sales of investment securities available for sale	(431)	(17)	(33)
Total securities gains (losses)	$ 26,673	$ 10,817	$ 29,096

Investments (Unrealized Losses)

Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities available for sale:
Less than 12 months, fair value	$ 5,257,891	$ 5,340,271
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	83,342	24,777
Aggregate fair value, continuous unrealized loss position, 12 months or more	362,351	280,126
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,689	6,094
Total fair value	5,620,242	5,620,397
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	88,031	30,871
U. S. Treasury
Investment securities available for sale:
Less than 12 months, fair value	807,822	1,539,637
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	935	1,118
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	807,822	1,539,637
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	935	1,118
Government Agency
Investment securities available for sale:
Less than 12 months, fair value		229,436
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments		374
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		229,436
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	374
Mortgage Backed Securities, Other
Investment securities available for sale:
Less than 12 months, fair value	4,442,700	3,570,470
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	82,161	23,275
Aggregate fair value, continuous unrealized loss position, 12 months or more	362,351	280,126
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,689	6,094
Total fair value	4,805,051	3,850,596
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	86,850	29,369
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	0	10
Other Debt Obligations
Investment securities available for sale:
Less than 12 months, fair value	7,369
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	246
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	7,369
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 246	$ 0

Investments (Narrative) (Detail

Investments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)investments	Dec. 31, 2015USD ($)
Investments [Abstract]
Available-for-sale Securities, Aggregate fair value, continuous unrealized loss position, 12 months or more	$ 362,351,000	$ 280,126,000
Number of investments in continuous unrealized loss position for more than twelve months | investments	51
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	$ 4,548,628,000	$ 4,726,446,000

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 5,500,000	$ 6,080,000
Advances from Federal Home Loan Banks	660,200	510,300
Federal Home Loan Bank Advances, Current Borrowing Capacity	4,840,000	5,570,000
Noncovered loans pledged to secure debt obligations	$ 8,260,000	8,580,000
Charge off of past due business credit card loans (days)	120 days
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 84,800	272,600
Carrying Value of Loans Held-for-Investment Sold at a Premium or Discount	77,700	45,900
Gain (Loss) on Sale of Loans and Leases	3,758	0	$ 0
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Accretion Income	14,300	18,700
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccruing	3,451	7,579
Loans on the Cost Recovery Method | PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired impaired loans	500	5,300
Cordia Bancorp Inc.
Financing Receivable, Recorded Investment [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining	4,200
Bancorporation
Financing Receivable, Recorded Investment [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining	27,400	41,100
Medical and Dental [Member]
Financing Receivable, Recorded Investment [Line Items]
Concentration of Risk, Loan Receivables, Industry	$ 4,660,000	$ 4,280,000
Concentration Risk, Percentage	21.50%	21.20%

Loans and Leases (Loans and Lea

Loans and Leases (Loans and Leases Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 84,800	$ 272,600
PCI Loans	809,169	950,516	$ 1,186,498
Non-PCI	20,928,709	19,289,474
Total loans and leases	21,737,878	20,239,990
Commercial
PCI Loans	499,970	593,614
Non-PCI	13,760,703	12,630,489
Commercial | Construction and land development
PCI Loans	20,766	33,880
Non-PCI	649,157	620,352
Commercial | Mortgage
PCI Loans	453,013	525,468
Non-PCI	9,026,220	8,274,548
Commercial | Commercial and industrial
PCI Loans	11,844	15,182
Non-PCI	2,567,501	2,368,958
Commercial | Lease financing
Non-PCI	826,270	730,778
Commercial | Other commercial real estate
PCI Loans	12,645	17,076
Non-PCI	351,291	321,021
Commercial | Other
PCI Loans	1,702	2,008
Non-PCI	340,264	314,832
Noncommercial
PCI Loans	309,199	356,902
Non-PCI	7,168,006	6,658,985
Noncommercial | Construction and land development
Non-PCI	231,400	220,073
Noncommercial | Mortgage
Non-PCI	2,889,124	2,695,985
Noncommercial | Revolving mortgage
Non-PCI	2,601,344	2,523,106
Noncommercial | Consumer
PCI Loans	1,772	2,273
Non-PCI	$ 1,446,138	$ 1,219,821

Loans and Leases (Loans Acquire

Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 809,169	$ 950,516	$ 1,186,498
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	499,970	593,614
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	20,766	33,880
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	453,013	525,468
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	12,645	17,076
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	11,844	15,182
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	1,702	2,008
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	309,199	356,902
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 1,772	$ 2,273

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, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	$ 20,928,709	$ 19,289,474
PCI Loans	809,169	950,516	$ 1,186,498
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	13,760,703	12,630,489
PCI Loans	499,970	593,614
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	649,157	620,352
PCI Loans	20,766	33,880
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	9,026,220	8,274,548
PCI Loans	453,013	525,468
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	351,291	321,021
PCI Loans	12,645	17,076
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,567,501	2,368,958
PCI Loans	11,844	15,182
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	826,270	730,778
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	340,264	314,832
PCI Loans	1,702	2,008
Commercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	1,702	2,008
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	13,370,678	12,204,677
PCI Loans	258,819	294,663
Commercial | Pass | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	645,232	611,314
PCI Loans	8,103	14,710
Commercial | Pass | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	8,821,439	8,024,831
PCI Loans	234,023	262,579
Commercial | Pass | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	347,509	318,187
PCI Loans	8,744	7,366
Commercial | Pass | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,402,659	2,219,606
PCI Loans	7,253	9,302
Commercial | Pass | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	818,008	719,338
Commercial | Pass | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	335,831	311,401
Commercial | Pass | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	696	706
Commercial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	106,252	132,021
PCI Loans	69,520	89,625
Commercial | Special Mention | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,236	5,191
PCI Loans	950	758
Commercial | Special Mention | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	76,084	100,220
PCI Loans	67,848	87,870
Commercial | Special Mention | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,433	475
PCI Loans	102	60
Commercial | Special Mention | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	22,804	19,361
PCI Loans	620	937
Commercial | Special Mention | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,675	4,869
Commercial | Special Mention | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,020	1,905
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	157,593	180,100
PCI Loans	154,278	193,051
Commercial | Substandard | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,683	3,847
PCI Loans	7,850	14,131
Commercial | Substandard | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	126,863	146,071
PCI Loans	138,312	163,801
Commercial | Substandard | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,349	959
PCI Loans	3,462	9,229
Commercial | Substandard | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	17,870	21,322
PCI Loans	3,648	4,588
Commercial | Substandard | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	5,415	6,375
Commercial | Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	3,413	1,526
Commercial | Substandard | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	1,006	1,302
Commercial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	348	1,176
PCI Loans	17,333	15,438
Commercial | Doubtful | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	6	0
PCI Loans	3,863	4,281
Commercial | Doubtful | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	334	599
PCI Loans	12,830	10,875
Commercial | Doubtful | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
PCI Loans	337	0
Commercial | Doubtful | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	8	408
PCI Loans	303	282
Commercial | Doubtful | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	169
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	125,832	112,515
PCI Loans	20	837
Commercial | Ungraded | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	0
PCI Loans	0	0
Commercial | Ungraded | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,500	2,827
PCI Loans	0	343
Commercial | Ungraded | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	0	1,400
PCI Loans	0	421
Commercial | Ungraded | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	124,160	108,261
PCI Loans	20	73
Commercial | Ungraded | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	172	27
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	7,168,006	6,658,985
PCI Loans	309,199	356,902
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	231,400	220,073
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,889,124	2,695,985
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,601,344	2,523,106
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,446,138	1,219,821
PCI Loans	1,772	2,273
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	20,928,709	19,289,474
Current	20,799,457	19,167,898
Past Due	129,252	121,576
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	649,157	620,352
Current	646,987	618,619
Past Due	2,170	1,733
Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	9,026,220	8,274,548
Current	9,001,526	8,243,584
Past Due	24,694	30,964
Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	351,291	321,021
Current	350,981	319,995
Past Due	310	1,026
Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,567,501	2,368,958
Current	2,556,430	2,363,966
Past Due	11,071	4,992
Non-PCI Loans | Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	826,270	730,778
Current	823,788	728,542
Past Due	2,482	2,236
Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	340,264	314,832
Current	339,994	314,531
Past Due	270	301
Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	7,168,006	6,658,985
Current	7,079,751	6,578,661
Non-PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	231,400	220,073
Current	229,106	214,555
Past Due	2,294	5,518
Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,889,124	2,695,985
Current	2,839,045	2,651,209
Past Due	50,079	44,776
Non-PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	2,601,344	2,523,106
Current	2,576,942	2,502,065
Past Due	24,402	21,041
Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-PCI Loans	1,446,138	1,219,821
Current	1,434,658	1,210,832
Past Due	11,480	8,989
PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	20,766	33,880
PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	453,013	525,468
PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	12,645	17,076
PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	11,844	15,182
PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	265,529	307,089
PCI Loans	309,199	356,902
PCI Loans | Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	0
PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	230,065	257,207
PCI Loans	268,777	302,158
PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	33,827	47,901
PCI Loans	38,650	52,471
PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,637	1,981
PCI Loans	1,772	2,273
PCI Loans | Noncommercial | Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	3,474	4,281
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	72,876	63,522
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	1,845	987
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	11,592	13,023
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	310	884
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	7,918	2,133
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	1,175	2,070
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	72	3
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	49,964	44,422
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	1,139	3,211
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	27,760	23,960
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	14,290	11,706
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,775	5,545
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,281	13,531
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	9,595	12,318
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	618	1,127
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	68	86
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	18,472	18,705
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	39	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	2,773	3,446
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	0
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	2,102	1,079
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	444	2
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	164
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,114	13,731
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	598	669
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,039	7,536
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	2,698	3,704
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,779	1,822
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,800	5,074
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,528	4,441
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	268	501
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4	132
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	37,904	39,349
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	286	463
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	10,329	14,495
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	0	142
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	1,051	1,780
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	863	164
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	198	134
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	25,177	22,171
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	557	1,638
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	15,280	13,280
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	7,414	5,631
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	1,926	1,622
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	26,589	31,208
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	22,589	28,192
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	3,937	2,942
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	$ 63	$ 74

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, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	$ 20,928,709	$ 19,289,474
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	13,760,703	12,630,489
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	649,157	620,352
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	9,026,220	8,274,548
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	351,291	321,021
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,567,501	2,368,958
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	826,270	730,778
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	340,264	314,832
Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	7,168,006	6,658,985
Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	231,400	220,073
Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,889,124	2,695,985
Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	2,601,344	2,523,106
Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-PCI Loans	1,446,138	1,219,821
Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	129,252	121,576
Current	20,799,457	19,167,898
Non-PCI Loans	20,928,709	19,289,474
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,170	1,733
Current	646,987	618,619
Non-PCI Loans	649,157	620,352
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	24,694	30,964
Current	9,001,526	8,243,584
Non-PCI Loans	9,026,220	8,274,548
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	310	1,026
Current	350,981	319,995
Non-PCI Loans	351,291	321,021
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,071	4,992
Current	2,556,430	2,363,966
Non-PCI Loans	2,567,501	2,368,958
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,482	2,236
Current	823,788	728,542
Non-PCI Loans	826,270	730,778
Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	270	301
Current	339,994	314,531
Non-PCI Loans	340,264	314,832
Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,079,751	6,578,661
Non-PCI Loans	7,168,006	6,658,985
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,294	5,518
Current	229,106	214,555
Non-PCI Loans	231,400	220,073
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	50,079	44,776
Current	2,839,045	2,651,209
Non-PCI Loans	2,889,124	2,695,985
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	24,402	21,041
Current	2,576,942	2,502,065
Non-PCI Loans	2,601,344	2,523,106
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,480	8,989
Current	1,434,658	1,210,832
Non-PCI Loans	1,446,138	1,219,821
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	72,876	63,522
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	1,845	987
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,592	13,023
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	310	884
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	7,918	2,133
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,175	2,070
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	72	3
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	49,964	44,422
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	1,139	3,211
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	27,760	23,960
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	14,290	11,706
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	6,775	5,545
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	18,472	18,705
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	39	283
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,773	3,446
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	0
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	2,102	1,079
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	444	2
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	164
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	13,114	13,731
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	598	669
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	7,039	7,536
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,698	3,704
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,779	1,822
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	37,904	39,349
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	286	463
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	10,329	14,495
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	0	142
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	1,051	1,780
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	863	164
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	198	134
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	25,177	22,171
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	557	1,638
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	15,280	13,280
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	7,414	5,631
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	$ 1,926	$ 1,622

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, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 82,307	$ 95,854
Loans and leases greater than 90 days and accruing	2,718	3,315
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	606	425
Loans and leases greater than 90 days and accruing	0	273
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	26,527	42,116
Loans and leases greater than 90 days and accruing	482	242
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	4,275	6,235
Loans and leases greater than 90 days and accruing	440	953
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	86	239
Loans and leases greater than 90 days and accruing	0	0
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	359	389
Loans and leases greater than 90 days and accruing	683	0
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,121	2,164
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	32,470	29,977
Loans and leases greater than 90 days and accruing	37	838
Noncommercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	319	133
Loans and leases greater than 90 days and accruing	0	2
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	14,308	12,704
Loans and leases greater than 90 days and accruing	0	0
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	2,236	1,472
Loans and leases greater than 90 days and accruing	$ 1,076	$ 1,007

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, 2016	Dec. 31, 2015	Dec. 31, 2014
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	$ 108,649	$ 247,812
Carrying Value of Acquired Impaired Loans [Roll Forward]
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(298,602)	(505,058)
Outstanding principal balance	1,266,395	1,693,372
PCI Loans	809,169	950,516	$ 1,186,498
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	93,178	207,688
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	80,690	154,496
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	76,565	114,580
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	499,970	593,614
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	58,934	139,894
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	309,199	356,902
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	21,756	14,602
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	20,766	33,880
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	684	4,116
Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	340	0
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	453,013	525,468
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	50,372	129,732
Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	18,934	13,251
Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,238	0
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	12,645	17,076
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	2,629	3,202
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	11,844	15,182
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	3,630	2,844
Other | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	1,702	2,008
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,619	0
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	1,772	2,273
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,244	1,351
PCI Loans
Loans and Leases Receivable Disclosure [Abstract]
Nonaccruing	3,451	7,579
PCI Loans | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	309,199	356,902
PCI Loans | Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	20,766	33,880
PCI Loans | Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	0	0
PCI Loans | Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	453,013	525,468
PCI Loans | Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	268,777	302,158
PCI Loans | Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	38,650	52,471
PCI Loans | Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	12,645	17,076
PCI Loans | Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	11,844	15,182
PCI Loans | Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	$ 1,772	$ 2,273

Loans and Leases (Changes In 70

Loans and Leases (Changes In Carrying Amount Of Accretable Yield) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 01, 2016	Dec. 31, 2014
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			$ 296,529
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition			2,678
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 241,392
Changes in Amount of Accretable Yield [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield	$ 335,074	$ 343,856		$ 418,160
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions	12,488	53,192
Accretion	(76,565)	(114,580)
Reclassifications from nonaccretable difference	29,931	25,357
Changes in expected cash flows that do not affect nonaccretable difference	$ 25,364	$ (38,273)

Loans and Leases (Recorded Fair

Loans and Leases (Recorded Fair Values of Purchased Non-Impaired Loans and Leases) (Details) $ in Thousands	Sep. 01, 2016USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	$ 241,392
Commercial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	134,468
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	3,066
Commercial | Mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	77,455
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	22,174
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	31,773
Noncommercial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	106,924
Noncommercial | Mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	16,839
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	9,867
Noncommercial | Consumer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total non-PCI loans and leases	$ 80,218

Allowance for Loan and Lease 72

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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 206,216	$ 204,466	$ 233,394
Provisions	32,941	20,664	640
Charge-offs	(30,201)	(28,348)	(37,770)
Recoveries	9,839	9,434	8,202
Net charge-offs	(20,362)	(18,914)	(29,568)
Ending balance	218,795	206,216	204,466
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	206,216	204,466	233,394	$ 218,795	$ 206,216	$ 204,466
Loans and Leases Evaluated for Impairment [Abstract]
Net Loans and Leases				21,519,083	20,033,774
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality				218,795	206,216
PCI Loans				809,169	950,516	1,186,498
Commercial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				499,970	593,614
Commercial | Construction and land development
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				20,766	33,880
Commercial | Mortgage
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				453,013	525,468
Commercial | Other commercial real estate
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				12,645	17,076
Commercial | Commercial and industrial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				11,844	15,182
Commercial | Other
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				1,702	2,008
Commercial | Consumer and Other
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				1,702	2,008
Noncommercial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				309,199	356,902
Noncommercial | Consumer
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				1,772	2,273
Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	189,904	182,837	179,874
Provisions	34,870	22,937	15,260
Charge-offs	(29,587)	(25,304)	(20,499)
Recoveries	9,839	9,434	8,202
Net charge-offs	(19,748)	(15,870)	(12,297)
Ending balance	205,026	189,904	182,837
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				9,210	7,200
ALLL for loans and leases collectively evaluated for impairment				195,816	182,704
Total allowance for loan and lease losses	189,904	182,837	179,874	205,026	189,904	182,837
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				136,399	150,367
Loans and leases collectively evaluated for impairment				20,792,310	19,139,107
Net Loans and Leases				20,928,709	19,289,474
Non-PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,288	11,961	10,335
Provisions	12,871	4,773	1,735
Charge-offs	(680)	(1,012)	(316)
Recoveries	398	566	207
Ending balance	28,877	16,288	11,961
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				151	123
ALLL for loans and leases collectively evaluated for impairment				28,726	16,165
Total allowance for loan and lease losses	16,288	11,961	10,335	28,877	16,288	11,961
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				1,045	3,094
Loans and leases collectively evaluated for impairment				648,112	617,258
Net Loans and Leases				649,157	620,352
Non-PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	69,896	85,189	100,257
Provisions	(21,912)	(15,822)	(16,746)
Charge-offs	(987)	(1,498)	(1,147)
Recoveries	1,281	2,027	2,825
Ending balance	48,278	69,896	85,189
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				3,488	3,370
ALLL for loans and leases collectively evaluated for impairment				44,790	66,526
Total allowance for loan and lease losses	69,896	85,189	100,257	48,278	69,896	85,189
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				76,361	95,107
Loans and leases collectively evaluated for impairment				8,949,859	8,179,441
Net Loans and Leases				9,026,220	8,274,548
Non-PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,168	732	1,009
Provisions	925	1,569	(401)
Charge-offs	0	(178)	0
Recoveries	176	45	124
Ending balance	3,269	2,168	732
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				152	289
ALLL for loans and leases collectively evaluated for impairment				3,117	1,879
Total allowance for loan and lease losses	2,168	732	1,009	3,269	2,168	732
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				1,563	427
Loans and leases collectively evaluated for impairment				349,728	320,594
Net Loans and Leases				351,291	321,021
Non-PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	43,116	30,727	22,362
Provisions	14,583	17,432	10,441
Charge-offs	(9,013)	(5,952)	(3,014)
Recoveries	1,539	909	938
Ending balance	50,225	43,116	30,727
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				1,732	1,118
ALLL for loans and leases collectively evaluated for impairment				48,493	41,998
Total allowance for loan and lease losses	43,116	30,727	22,362	50,225	43,116	30,727
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				12,600	17,910
Loans and leases collectively evaluated for impairment				2,554,901	2,351,048
Net Loans and Leases				2,567,501	2,368,958
Non-PCI Loans | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,524	4,286	4,749
Provisions	635	1,602	(473)
Charge-offs	(442)	(402)	(100)
Recoveries	190	38	110
Ending balance	5,907	5,524	4,286
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				75	213
ALLL for loans and leases collectively evaluated for impairment				5,832	5,311
Total allowance for loan and lease losses	5,524	4,286	4,749	5,907	5,524	4,286
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				1,074	1,755
Loans and leases collectively evaluated for impairment				825,196	729,023
Net Loans and Leases				826,270	730,778
Non-PCI Loans | Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,855	3,184	190
Provisions	877	(1,420)	3,007
Charge-offs	(144)	0	(13)
Recoveries	539	91	0
Ending balance	3,127	1,855	3,184
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				23	0
ALLL for loans and leases collectively evaluated for impairment				3,104	1,855
Total allowance for loan and lease losses	1,855	3,184	190	3,127	1,855	3,184
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				142	1,183
Loans and leases collectively evaluated for impairment				340,122	313,649
Net Loans and Leases				340,264	314,832
Non-PCI Loans | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,485	892	681
Provisions	45	541	245
Charge-offs	0	(22)	(118)
Recoveries	66	74	84
Ending balance	1,596	1,485	892
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				109	49
ALLL for loans and leases collectively evaluated for impairment				1,487	1,436
Total allowance for loan and lease losses	1,485	892	681	1,596	1,485	892
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				2,613	784
Loans and leases collectively evaluated for impairment				228,787	219,289
Net Loans and Leases				231,400	220,073
Non-PCI Loans | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,105	10,661	10,511
Provisions	9,448	4,202	1,219
Charge-offs	(926)	(1,619)	(1,260)
Recoveries	467	861	191
Ending balance	23,094	14,105	10,661
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				2,447	1,212
ALLL for loans and leases collectively evaluated for impairment				20,647	12,893
Total allowance for loan and lease losses	14,105	10,661	10,511	23,094	14,105	10,661
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				31,476	22,986
Loans and leases collectively evaluated for impairment				2,857,648	2,672,999
Net Loans and Leases				2,889,124	2,695,985
Non-PCI Loans | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,971	18,650	16,239
Provisions	(1,234)	(927)	6,301
Charge-offs	(3,287)	(2,925)	(4,744)
Recoveries	916	1,173	854
Ending balance	12,366	15,971	18,650
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				366	299
ALLL for loans and leases collectively evaluated for impairment				12,000	15,672
Total allowance for loan and lease losses	15,971	18,650	16,239	12,366	15,971	18,650
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				7,613	5,883
Loans and leases collectively evaluated for impairment				2,593,731	2,517,223
Net Loans and Leases				2,601,344	2,523,106
Non-PCI Loans | Noncommercial | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,496	16,555	13,541
Provisions	18,632	10,987	9,932
Charge-offs	(14,108)	(11,696)	(9,787)
Recoveries	4,267	3,650	2,869
Ending balance	28,287	19,496	16,555
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment				667	527
ALLL for loans and leases collectively evaluated for impairment				27,620	18,969
Total allowance for loan and lease losses	19,496	16,555	13,541	28,287	19,496	16,555
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment				1,912	1,238
Loans and leases collectively evaluated for impairment				1,444,226	1,218,583
Net Loans and Leases				1,446,138	1,219,821
PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,312	21,629	53,520
Provisions	(1,929)	(2,273)	(14,620)
Charge-offs	(614)	(3,044)	(17,271)
Recoveries	0	0	0
Net charge-offs	(614)	(3,044)	(17,271)
Ending balance	13,769	16,312	21,629
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	16,312	21,629	53,520	13,769	16,312	21,629
PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,082	150	1,320
Provisions	(599)	1,029	1,284
Charge-offs	0	(97)	(2,454)
Recoveries	0	0	0
Ending balance	483	1,082	150
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	1,082	150	1,320	483	1,082	150
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				20,766	33,880
PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,838	10,135	29,906
Provisions	(1,249)	(1,426)	(7,903)
Charge-offs	(166)	(871)	(11,868)
Recoveries	0	0	0
Ending balance	6,423	7,838	10,135
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	7,838	10,135	29,906	6,423	7,838	10,135
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				453,013	525,468
PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	773	75	1,354
Provisions	(266)	698	(1,385)
Charge-offs	(5)	0	(106)
Recoveries	0	0
Ending balance	502	773	75
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	773	75	1,354	502	773	75
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				12,645	17,076
PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	445	1,240	5,275
Provisions	59	(470)	(2,023)
Charge-offs	0	(325)	(2,012)
Recoveries	0	0	0
Ending balance	504	445	1,240
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	445	1,240	5,275	504	445	1,240
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				11,844	15,182
PCI Loans | Noncommercial
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				309,199	356,902
PCI Loans | Noncommercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	183	682
Provisions	0	(183)	(395)
Charge-offs	0	0	(104)
Recoveries	0	0	0
Ending balance	0	0	183
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	0	183	682	0	0	183
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				0	0
PCI Loans | Noncommercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,398	5,820	11,802
Provisions	(209)	72	(5,576)
Charge-offs	(371)	(494)	(406)
Recoveries	0	0	0
Ending balance	4,818	5,398	5,820
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	5,398	5,820	11,802	4,818	5,398	5,820
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				268,777	302,158
PCI Loans | Noncommercial | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	523	3,999	2,959
Provisions	433	(2,720)	1,523
Charge-offs	0	(756)	(483)
Recoveries	0	0	0
Ending balance	956	523	3,999
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	523	3,999	2,959	956	523	3,999
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				38,650	52,471
PCI Loans | Noncommercial | Consumer
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				1,772	2,273
PCI Loans | Noncommercial | Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	253	27	222
Provisions	(98)	727	(145)
Charge-offs	(72)	(501)	(50)
Recoveries	0	0	0
Ending balance	83	253	27
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	$ 253	$ 27	$ 222	83	253	$ 27
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
PCI Loans				$ 3,474	$ 4,281

Allowance for Loan and Lease 73

Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 1,266,395	$ 1,693,372
Allowance for loan and lease losses	218,795	206,216	$ 204,466	$ 233,394
Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	150,189	167,966
ALLL for loans and leases individually evaluated for impairment	9,210	7,200
Impaired Financing Receivable, with Related Allowance, Recorded Investment	79,491	66,861
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56,908	83,506
Financing Receivable, Individually Evaluated for Impairment	136,399	150,367
Average balance	135,982	136,404	127,421
Interest income recognized	4,466	4,675	5,427
Allowance for loan and lease losses	205,026	189,904	182,837	179,874
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,880	863
ALLL for loans and leases individually evaluated for impairment	152	289
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,279	305
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	284	122
Financing Receivable, Individually Evaluated for Impairment	1,563	427
Average balance	1,112	481	2,125
Interest income recognized	38	12	80
Allowance for loan and lease losses	3,269	2,168	732	1,009
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,172	4,428
ALLL for loans and leases individually evaluated for impairment	151	123
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,002	1,623
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	43	1,471
Financing Receivable, Individually Evaluated for Impairment	1,045	3,094
Average balance	2,700	3,164	1,689
Interest income recognized	138	146	83
Allowance for loan and lease losses	28,877	16,288	11,961	10,335
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	82,658	103,763
ALLL for loans and leases individually evaluated for impairment	3,488	3,370
Impaired Financing Receivable, with Related Allowance, Recorded Investment	42,875	41,793
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	33,486	53,314
Financing Receivable, Individually Evaluated for Impairment	76,361	95,107
Average balance	82,146	89,934	86,250
Interest income recognized	2,671	3,129	3,698
Allowance for loan and lease losses	48,278	69,896	85,189	100,257
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	16,637	21,455
ALLL for loans and leases individually evaluated for impairment	1,732	1,118
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,920	8,544
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,680	9,366
Financing Receivable, Individually Evaluated for Impairment	12,600	17,910
Average balance	11,878	14,587	13,433
Interest income recognized	417	510	580
Allowance for loan and lease losses	50,225	43,116	30,727	22,362
Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,074	1,956
ALLL for loans and leases individually evaluated for impairment	75	213
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,002	1,651
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	72	104
Financing Receivable, Individually Evaluated for Impairment	1,074	1,755
Average balance	1,307	1,718	774
Interest income recognized	63	74	44
Allowance for loan and lease losses	5,907	5,524	4,286	4,749
Non-PCI Loans | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	233	1,260
ALLL for loans and leases individually evaluated for impairment	23	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	142	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	1,183
Financing Receivable, Individually Evaluated for Impairment	142	1,183
Average balance	687	1,673	528
Interest income recognized	33	37	29
Allowance for loan and lease losses	3,127	1,855	3,184	190
Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,030	784
ALLL for loans and leases individually evaluated for impairment	109	49
Impaired Financing Receivable, with Related Allowance, Recorded Investment	645	693
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,968	91
Financing Receivable, Individually Evaluated for Impairment	2,613	784
Average balance	983	829	1,678
Interest income recognized	50	38	98
Allowance for loan and lease losses	1,596	1,485	892	681
Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	32,588	25,043
ALLL for loans and leases individually evaluated for impairment	2,447	1,212
Impaired Financing Receivable, with Related Allowance, Recorded Investment	20,269	10,097
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,207	12,889
Financing Receivable, Individually Evaluated for Impairment	31,476	22,986
Average balance	26,774	18,524	15,487
Interest income recognized	805	557	593
Allowance for loan and lease losses	23,094	14,105	10,661	10,511
Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,831	7,120
ALLL for loans and leases individually evaluated for impairment	366	299
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,825	1,105
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,788	4,778
Financing Receivable, Individually Evaluated for Impairment	7,613	5,883
Average balance	6,915	4,368	3,922
Interest income recognized	171	97	134
Allowance for loan and lease losses	12,366	15,971	18,650	16,239
Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2,086	1,294
ALLL for loans and leases individually evaluated for impairment	667	527
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,532	1,050
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	380	188
Financing Receivable, Individually Evaluated for Impairment	1,912	1,238
Average balance	1,480	1,126	1,535
Interest income recognized	80	75	88
Allowance for loan and lease losses	28,287	19,496	16,555	13,541
PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans which have adverse change in expected cash flows	359,699	469,252
Allowance for loan and lease losses	13,769	16,312	21,629	53,520
PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	502	773	75	1,354
PCI Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	483	1,082	150	1,320
PCI Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	6,423	7,838	10,135	29,906
PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	504	445	1,240	5,275
PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	0	0	183	682
PCI Loans | Noncommercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	4,818	5,398	5,820	11,802
PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 956	$ 523	$ 3,999	$ 2,959

Allowance for Loan and Lease 74

Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)loans	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	$ 218,795,000	$ 206,216,000	$ 204,466,000	$ 233,394,000
Financing Receivable, Modifications, Recorded Investment	150,916,000	144,843,000
Impaired Loans and Leases, Baseline for Meaurement	500,000
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	$ 205,026,000	$ 189,904,000	182,837,000	179,874,000
Financing Receivable, Modifications, Number of Contracts | loans	503	372
Nonaccruing	$ 82,307,000	$ 95,854,000
Financing Receivable, Modifications, Recorded Investment	124,547,000	114,192,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 41,031,000	$ 37,183,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	143	50
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 7,558,000	$ 8,326,000
PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	$ 13,769,000	$ 16,312,000	21,629,000	53,520,000
Financing Receivable, Modifications, Number of Contracts | loans	10	18
Nonaccruing	$ 3,451,000	$ 7,579,000
Financing Receivable, Modifications, Recorded Investment	26,369,000	30,600,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,444,000	$ 1,752,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,000	$ 96,000
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	101,858,000	104,978,000
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,600,000	3,881,000
Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	28,877,000	16,288,000	11,961,000	10,335,000
Nonaccruing	606,000	425,000
Commercial | Construction and land development | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	483,000	1,082,000	150,000	1,320,000
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	84,698,000	84,540,000
Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	48,278,000	69,896,000	85,189,000	100,257,000
Nonaccruing	26,527,000	42,116,000
Commercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	6,423,000	7,838,000	10,135,000	29,906,000
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,715,000	1,840,000
Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	3,269,000	2,168,000	732,000	1,009,000
Nonaccruing	86,000	239,000
Commercial | Other commercial real estate | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	502,000	773,000	75,000	1,354,000
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,629,000	12,174,000
Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	50,225,000	43,116,000	30,727,000	22,362,000
Nonaccruing	4,275,000	6,235,000
Commercial | Commercial and industrial | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	504,000	445,000	1,240,000	5,275,000
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,074,000	1,360,000
Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	5,907,000	5,524,000	4,286,000	4,749,000
Nonaccruing	359,000	389,000
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	142,000	1,183,000
Commercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	3,127,000	1,855,000	3,184,000	190,000
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	49,058,000	39,865,000
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	240,000	784,000
Noncommercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	1,596,000	1,485,000	892,000	681,000
Nonaccruing	1,121,000	2,164,000
Noncommercial | Construction and land development | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	0	0	183,000	682,000
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	39,129,000	32,556,000
Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	23,094,000	14,105,000	10,661,000	10,511,000
Nonaccruing	32,470,000	29,977,000
Noncommercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	4,818,000	5,398,000	5,820,000	11,802,000
Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	319,000	133,000
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,777,000	5,305,000
Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	12,366,000	15,971,000	18,650,000	16,239,000
Nonaccruing	14,308,000	12,704,000
Noncommercial | Revolving mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	956,000	523,000	3,999,000	2,959,000
Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,912,000	1,220,000
Noncommercial | Consumer and Other | PCI Loans
Financing Receivable, Modifications [Line Items]
Allowance for loan and lease losses	83,000	253,000	$ 27,000	$ 222,000
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	127,530,000	113,296,000
Performing Financial Instruments [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	85,329,000	82,394,000
Performing Financial Instruments [Member] | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,292,000	3,624,000
Performing Financial Instruments [Member] | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	70,263,000	65,812,000
Performing Financial Instruments [Member] | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,635,000	1,751,000
Performing Financial Instruments [Member] | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,193,000	8,833,000
Performing Financial Instruments [Member] | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	882,000	1,191,000
Performing Financial Instruments [Member] | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	64,000	1,183,000
Performing Financial Instruments [Member] | Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	42,201,000	30,902,000
Performing Financial Instruments [Member] | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	240,000	784,000
Performing Financial Instruments [Member] | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	34,012,000	25,427,000
Performing Financial Instruments [Member] | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,346,000	3,600,000
Performing Financial Instruments [Member] | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,603,000	1,091,000
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Nonaccruing	23,386,000	31,547,000
Nonperforming Financial Instruments [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Nonaccruing	16,529,000	22,584,000
Nonperforming Financial Instruments [Member] | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Nonaccruing	308,000	257,000
Nonperforming Financial Instruments [Member] | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing	14,435,000	18,728,000
Nonperforming Financial Instruments [Member] | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Nonaccruing	80,000	89,000
Nonperforming Financial Instruments [Member] | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,436,000	3,341,000
Nonperforming Financial Instruments [Member] | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Nonaccruing	192,000	169,000
Nonperforming Financial Instruments [Member] | Commercial | Other
Financing Receivable, Modifications [Line Items]
Nonaccruing	78,000	0
Nonperforming Financial Instruments [Member] | Noncommercial
Financing Receivable, Modifications [Line Items]
Nonaccruing	6,857,000	8,963,000
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	5,117,000	7,129,000
Nonperforming Financial Instruments [Member] | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,431,000	1,705,000
Nonperforming Financial Instruments [Member] | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Nonaccruing	$ 309,000	$ 129,000
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	37	27
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,919,000	$ 4,858,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 40,000	$ 334,000
Extended Maturity [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 178,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Commercial | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 40,000	$ 18,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 40,000	$ 18,000
Extended Maturity [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	7	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,428,000	$ 3,144,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 316,000
Extended Maturity [Member] | Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 747,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Commercial | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	8	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,070,000	$ 1,380,000
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	0	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 146,000
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	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 421,000	$ 0
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	15	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,183,000	$ 110,000
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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 178,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Extended Maturity [Member] | Noncommercial | Revolving mortgage | 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	$ 8,000
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] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	309	218
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 28,299,000	$ 24,728,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	87	24
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 6,054,000	$ 6,327,000
Interest Rate Below Market Reduction [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	8	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,479,000	$ 1,187,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 96,000
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	6	21
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 231,000	$ 992,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 122,000
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	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 52,000	$ 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] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	45	37
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 12,030,000	$ 13,900,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	16	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,986,000	$ 3,969,000
Interest Rate Below Market Reduction [Member] | Commercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,255,000	$ 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] | Commercial | Other commercial real estate | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 619,000	$ 122,000
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	34	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,056,000	$ 2,301,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	11	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,144,000	$ 1,619,000
Interest Rate Below Market Reduction [Member] | Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 152,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 152,000	$ 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	15	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 676,000	$ 253,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96,000	$ 0
Interest Rate Below Market Reduction [Member] | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	185	116
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 11,087,000	$ 5,695,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	48	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,583,000	$ 607,000
Interest Rate Below Market Reduction [Member] | Noncommercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 172,000	$ 1,187,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 96,000
Interest Rate Below Market Reduction [Member] | Noncommercial | Other | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 120,000	$ 1,183,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 78,000	$ 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	5	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 106,000	$ 136,000
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	154	121
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,122,000	$ 6,545,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	53	23
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,016,000	$ 1,665,000
Discharge of Debt [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,965,000	$ 387,000
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 | Construction and land development | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 22,000	$ 38,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 22,000	$ 3,000
Discharge of Debt [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 347,000	$ 1,897,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 73,000	$ 644,000
Discharge of Debt [Member] | Commercial | Mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,965,000	$ 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 | Commercial and industrial | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 83,000	$ 146,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Commercial | Lease financing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 84,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Noncommercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	22	29
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 773,000	$ 1,454,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	14	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 326,000	$ 242,000
Discharge of Debt [Member] | Noncommercial | 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	$ 282,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Discharge of Debt [Member] | Noncommercial | Revolving mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	51	56
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,043,000	$ 2,714,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	13	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 345,000	$ 701,000
Discharge of Debt [Member] | Noncommercial | Revolving mortgage | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 105,000
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	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 691,000	$ 1,052,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 448,000	$ 0
Principal Forgiveness [Member] | Commercial | Mortgage | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 569,000	$ 185,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 326,000	$ 0
Principal Forgiveness [Member] | Commercial | Commercial and industrial | 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	$ 776,000
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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 91,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Principal Forgiveness [Member] | Noncommercial | 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	$ 122,000	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 122,000	$ 0

Allowance for Loan and Lease 75

Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)loans	Dec. 31, 2015USD ($)loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 150,916	$ 144,843
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	101,858	104,978
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,600	3,881
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	84,698	84,540
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,715	1,840
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,629	12,174
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,074	1,360
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	142	1,183
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	49,058	39,865
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	240	784
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	39,129	32,556
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,777	5,305
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 124,547	$ 114,192
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	143	50
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 7,558	$ 8,326
Financing Receivable, Modifications, Number of Contracts | loans	503	372
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 41,031	$ 37,183
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 26,369	$ 30,600
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3	$ 96
Financing Receivable, Modifications, Number of Contracts | loans	10	18
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,444	$ 1,752
Principal Forgiveness [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 448	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 691	$ 1,052
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 326	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 569	$ 185
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	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 776
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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 91
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 122	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 122	$ 0
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 40	$ 334
Financing Receivable, Modifications, Number of Contracts | loans	37	27
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,919	$ 4,858
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	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 40	$ 18
Financing Receivable, Modifications, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 40	$ 18
Extended Maturity [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	$ 316
Financing Receivable, Modifications, Number of Contracts | loans	7	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,428	$ 3,144
Extended Maturity [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	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 747	$ 0
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	8	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,070	$ 1,380
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	0	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 146
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	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 421	$ 0
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	15	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,183	$ 110
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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 8
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 30	$ 52
Extended Maturity [Member] | PCI Loans
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	$ 178
Extended Maturity [Member] | 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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 178
Interest Rate Below Market Reduction [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	87	24
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 6,054	$ 6,327
Financing Receivable, Modifications, Number of Contracts | loans	309	218
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 28,299	$ 24,728
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	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 122
Financing Receivable, Modifications, Number of Contracts | loans	6	21
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 231	$ 992
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	16	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,986	$ 3,969
Financing Receivable, Modifications, Number of Contracts | loans	45	37
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 12,030	$ 13,900
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	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 619	$ 122
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	11	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,144	$ 1,619
Financing Receivable, Modifications, Number of Contracts | loans	34	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,056	$ 2,301
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 152	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 152	$ 0
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	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 96	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	15	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 676	$ 253
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	48	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,583	$ 607
Financing Receivable, Modifications, Number of Contracts | loans	185	116
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 11,087	$ 5,695
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	5	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 106	$ 136
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	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 15	$ 10
Financing Receivable, Modifications, Number of Contracts | loans	10	18
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 222	$ 146
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	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 78	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 120	$ 1,183
Interest Rate Below Market Reduction [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	$ 96
Financing Receivable, Modifications, Number of Contracts | loans	8	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,479	$ 1,187
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	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 52	$ 0
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	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,255	$ 0
Interest Rate Below Market Reduction [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	$ 96
Financing Receivable, Modifications, Number of Contracts | loans	3	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 172	$ 1,187
Discharge of Debt [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	53	23
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,016	$ 1,665
Financing Receivable, Modifications, Number of Contracts | loans	154	121
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,122	$ 6,545
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	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 22	$ 3
Financing Receivable, Modifications, Number of Contracts | loans	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 22	$ 38
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 73	$ 644
Financing Receivable, Modifications, Number of Contracts | loans	4	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 347	$ 1,897
Discharge of Debt [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	6	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 83	$ 146
Discharge of Debt [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	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 84	$ 0
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	14	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 326	$ 242
Financing Receivable, Modifications, Number of Contracts | loans	22	29
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 773	$ 1,454
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	23	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 250	$ 75
Financing Receivable, Modifications, Number of Contracts | loans	69	25
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 770	$ 296
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	13	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 345	$ 701
Financing Receivable, Modifications, Number of Contracts | loans	51	56
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,043	$ 2,714
Discharge of Debt [Member] | PCI Loans
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	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,965	$ 387
Discharge of Debt [Member] | PCI Loans | Commercial | Mortgage
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	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,965	$ 0
Discharge of Debt [Member] | 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	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 282
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	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 105

Premises and Equipment (Major C

Premises and Equipment (Major Classifications) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,859,822	$ 1,810,954
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	726,778	675,125
Property, Plant and Equipment, Net	1,133,044	1,135,829
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	285,612	279,932
Premises and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,130,650	1,089,644
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 443,560	$ 441,378

Premises and Equipment (Operati

Premises and Equipment (Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Due 2,014	$ 26,068
Due 2,015	22,000
Due 2,016	13,295
Due 2,017	7,081
Due 2,018	6,114
Due thereafter	43,133
Total minimum payments	117,691
Rent expense, net	13,000	$ 13,800	$ 18,500
Rent income	$ 6,500	$ 6,400	$ 2,700

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 21,800		$ 15,600
Covered
Beginning Balance	6,817		22,982
Additions	4,888		7,357
Sales	(937)		(19,629)
Write-downs	(580)		(1,478)
Other Real Estate Covered Transfers	(9,716)	[1]	(2,415)
Noncovered
Beginning balance	58,742		70,454
Additions	30,384		47,866
Sales	(33,241)		(56,853)
Write-downs	(6,387)		(5,140)
Other Real Estate Non Covered Transfers	9,716	[1]	2,415
Total
Beginning balance	65,559		93,436
Additions	35,272		55,223
Sales	(34,178)		(76,482)
Write-downs	(6,967)		(6,618)
Other Real Estate Transfers	0	[1]	0
Ending balance	61,231		65,559
Cordia Bancorp Inc.
Covered
Additions	0
Noncovered
Additions	1,200
Total
Additions	1,200
First CornerStone Bank
Covered
Additions	0
Noncovered
Additions	400
Total
Additions	400
Mortgage
Total
Beginning balance	16,071
Ending balance	$ 15,019		$ 16,071
[1]	Transfers include OREO balances associated with expired or terminated shared-loss agreements.

FDIC Shared-Loss Receivable a79

FDIC Shared-Loss Receivable and Payable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
FDIC Loss Share Receivable [Abstract]
Cash Paid To FDIC For Termination Of Loss Share Agreements	$ 20,100
FDIC Indemnification Asset [Roll Forward]
Beginning balance	4,054	$ 28,701	$ 93,397
FDIC Indemnification Asset, Acquisitions	0	0	5,106
Accretion of discounts and premiums, net	(4,734)	(10,899)	(43,422)
Receipt of payments from FDIC	21,059	33,296	1,286
Post-acquisition and other adjustments, net	(14,745)	(47,044)	(27,666)
FDIC Indemnification Asset, Disposals	(1,462)	0	0
Ending balance	4,172	4,054	28,701
Termination Of Federal Deposit Insurance Corporation Loss Share Clawback Payable	18,200
Gain (Loss) on Contract Termination	(3,377)	0	0
FDIC shared-loss payable	97,008	126,453
Clawback Liability Adjustment And Release Of Related Reserves	20,000
Net impact from FDIC shared-loss termination	16,559	0	$ 0
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 84,800	$ 272,600

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgage Banking [Abstract]
Servicing Asset at Amortized Cost	$ 20,415,000	$ 19,351,000	$ 16,688,000	$ 16,000

Deposits (Details)

Deposits (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
FDIC Deposit Insurance Limit	$ 250,000
Time Deposits Greater than $250,000, Carrying Value	519,700,000	$ 590,600,000
Deposits, by Type [Abstract]
Demand	10,130,549,000	9,274,470,000
Checking With Interest	4,919,727,000	4,445,353,000
Money market accounts	8,193,392,000	8,205,705,000
Savings	2,099,579,000	1,909,021,000
Time	2,818,096,000	3,096,206,000
Total deposits	28,161,343,000	$ 26,930,755,000
Maturities of Time Deposits [Abstract]
2,014	1,984,571,000
2,015	435,823,000
2,016	175,359,000
2,017	154,294,000
2,018	68,046,000
Thereafter	$ 3,000

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Short-term borrowings	$ 603,487	$ 594,733
Federal Home Loan Bank Advances, Current Borrowing Capacity	4,840,000	5,570,000
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term borrowings	590,772	592,182
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term borrowings	10,000	0
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	715,000
Unamortized Purchase Accounting Adjustments [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 164	$ 0

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase, Gross	$ 620,772	$ 622,182
Securities Sold under Agreements to Repurchase	620,772	622,182
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	690,800	722,000
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	590,772	592,182
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	0	4,276
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	0	4,276
U. S. Treasury
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	620,772	617,906
U. S. Treasury | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	590,772	592,182
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	$ 30,000	$ 25,724

Long-Term Obligations (Details)

Long-Term Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt, Fiscal Year Maturity [Abstract]
2,014	$ 3,232
2,015	135,652
2,016	241
2,017	255
2,018	70,271
Thereafter	623,291
Total long-term obligations	832,942	$ 704,155
Trust Preferred Securities	121,500
Junior Subordinated Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	125,259
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	90,207	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	24,742	25,774
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	5,701	9,226
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	$ 660,237	510,252
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	$ 0	10,000
Unamortized Purchase Accounting Adjustments [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	(3,350)	(2,907)
Other Long Term Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 30,095	$ 30,108
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, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 7,006,580	$ 6,861,293
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]
Investment securities available for sale	7,006,580	6,861,293
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
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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		$ 539,741	$ 534,086
Overnight investments		1,872,594	2,063,132
Investment securities available for sale		7,006,580	6,861,293
Investment securities held to maturity		98	255
Net loans and leases		21,519,083	20,033,774
FDIC loss share receivable		4,172	4,054	$ 28,701	$ 93,397
Income earned not collected		79,839	70,036
Deposits		28,161,343	26,930,755
Short-term borrowings		603,487	594,733
Long-term obligations		832,942	704,155
FDIC shared-loss payable		97,008	126,453
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		539,741	534,086
Overnight investments		1,872,594	2,063,132
Investment securities available for sale		7,006,580	6,861,293
Investment securities held to maturity		98	255
Loans held for sale		74,401	59,766
Net loans and leases		21,519,083	20,033,774
FDIC loss share receivable		4,172	4,054
Income earned not collected		79,839	70,036
Federal Home Loan Bank stock		43,495	37,511
Mortgage servicing assets		20,415	19,351
Deposits		28,161,343	26,930,755
Short-term borrowings		603,487	594,733
Long-term obligations		832,942	704,155
FDIC shared-loss payable		97,008	126,453
Accrued interest payable		3,797	5,713
Interest rate swap	[1]	0	1,429
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		539,741	534,086
Overnight investments		1,872,594	2,063,132
Investment securities available for sale		7,006,580	6,861,293
Investment securities held to maturity		104	265
Loans held for sale		74,401	59,766
Net loans and leases		20,614,548	19,353,325
FDIC loss share receivable		4,172	4,054
Income earned not collected		79,839	70,036
Federal Home Loan Bank stock		43,495	37,511
Mortgage servicing assets		24,446	19,495
Deposits		28,135,698	26,164,472
Short-term borrowings		603,487	594,733
Long-term obligations		832,201	718,102
FDIC shared-loss payable		100,069	131,894
Accrued interest payable		3,797	5,713
Interest rate swap	[1]	$ 0	$ 1,429
[1]	The interest rate swap agreement expired in June 2016.

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, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 7,006,580	$ 6,861,293
Loans held for sale	74,401	59,766
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	7,006,580	6,861,293
Loans held for sale	74,401	59,766
Interest rate swaps accounted for as cash flow hedges		1,429
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	29,145	1,668
Loans held for sale	0	0
Interest rate swaps accounted for as cash flow hedges		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	6,977,435	6,859,625
Loans held for sale	74,401	59,766
Interest rate swaps accounted for as cash flow hedges		1,429
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	0
Interest rate swaps accounted for as cash flow hedges		0
Fair Value, Measurements, Recurring | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	1,650,319	1,674,882
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	1,650,319	1,674,882
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	40,398	498,660
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	40,398	498,660
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	5,175,425	4,668,198
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	5,175,425	4,668,198
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	7,369	2,160
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	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	7,369	2,160
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	0
Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	83,507	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	29,145	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	54,362	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	0
Fair Value, Measurements, Recurring | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	49,562	8,500
Fair Value, Measurements, Recurring | Corporate Bonds | 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 | Corporate Bonds | 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	49,562	8,500
Fair Value, Measurements, Recurring | Corporate Bonds | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 0	$ 0

Estimated Fair Values (Fair Val

Estimated Fair Values (Fair Value Option) (Details) - Loans Held For Sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (2,368)	$ 176
Fair Value Of Items For Which Fair Value Option Was Elected Assets	74,401	59,766
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets	75,893	58,890
Fair Value Option Aggregate Difference Assets	$ (1,492)	$ 876

Estimated Fair Values (Assets89

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Non Covered	$ 60,759	$ 58,742	$ 70,454
Other Real Estate, Covered	472	6,817	$ 22,982
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	70,977	64,197
Other Real Estate, Non Covered	44,963	44,571
Other Real Estate, Covered	439	4,403
Mortgage servicing assets	342	17,997
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
Mortgage servicing assets	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
Mortgage servicing assets	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	70,977	64,197
Other Real Estate, Non Covered	44,963	44,571
Other Real Estate, Covered	439	4,403
Mortgage servicing assets	$ 342	$ 17,997

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 28,400	$ 24,500
Defined Benefit Plan, Target Allocation Variance	10.00%
Defined Contribution Plan, Cost Recognized	$ 23,500	22,600	$ 16,400
Employer contributions	$ 50,000	$ 30,000
Percent of employer match	100.00%			4.50%
Percentage of employee compensation matched	6.00%
Additional contribution if employed at end of year	3.00%
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	100.00%	100.00%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 587,327	$ 533,125
Employer contributions	$ 50,000	$ 30,000
Assumed discount rate (percent)	4.68%	4.27%	4.90%
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%	7.50%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments	$ 0	$ (2,076)	$ 0
Defined Benefit Plan, Accumulated Benefit Obligation	$ 143,676	$ 131,879
Assumed discount rate (percent)	4.68%	4.27%	4.35%
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%	7.50%
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized			$ 1,100
401(k) Matching Range 2
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match				50.00%
Percentage of employee compensation matched				3.00%
401(k) Matching Range 1
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, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	$ 50,000	$ 30,000
BancShares Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	611,502	627,645
Service cost	12,618	14,083	$ 12,332
Interest cost	28,892	26,975	25,615
Actuarial (gain) loss	40,571	(39,002)
Benefits paid	(20,356)	(18,199)
Benefit obligation at December 31	673,227	611,502	627,645
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	550,025	544,956
Actual return on plan assets	20,947	(6,732)
Employer contributions	50,000	30,000
Benefits paid	(20,356)	(18,199)
Fair value of plan assets, ending balance	600,616	550,025	544,956
Funded status	(72,611)	(61,477)
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments	0	(2,076)	0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	143,241	151,332
Service cost	2,567	3,341	832
Interest cost	6,775	6,393	1,488
Actuarial (gain) loss	9,682	(10,937)
Benefits paid	(5,434)	(4,812)
Benefit obligation at December 31	156,831	143,241	151,332
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	150,893	155,618
Actual return on plan assets	6,625	87
Benefits paid	(5,434)	(4,812)
Fair value of plan assets, ending balance	152,084	150,893	$ 155,618
Funded status	$ (4,747)	$ 7,652

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized in the Financial Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
BancShares Plan
Amounts recognized in the consolidated balance sheets
Other assets	$ 0	$ 0
Other liabilities	72,611	61,477
Net asset (liability) recognized	72,611	61,477
Amount recognized in accumulated other comprehensive income
Net loss (gain)	119,766	70,358
Less prior service cost	347	556
Accumulated other comprehensive loss, excluding income taxes	120,113	70,914
Actuarial loss	8,938
Prior service cost	210
Total	9,148
Bancorporation Plan
Amounts recognized in the consolidated balance sheets
Other assets	0	0
Other liabilities	4,747	7,652
Net asset (liability) recognized	4,747	7,652
Amount recognized in accumulated other comprehensive income
Net loss (gain)	21,661	7,505
Less prior service cost	0	0
Accumulated other comprehensive loss, excluding income taxes	21,661	$ 7,505
Actuarial loss	855
Prior service cost	0
Total	$ 855

Employee Benefit Plans (Net Ben

Employee Benefit Plans (Net Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total change in pension obligation, net of tax	$ 7,069	$ 11,586	$ 5,358
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	12,618	14,083	12,332
Interest cost	28,892	26,975	25,615
Expected return on assets	(36,643)	(33,198)	(31,269)
Amortization of prior service cost	(210)	(210)	(210)
Amortization of net actuarial loss	6,859	11,376	5,148
Total pension expense	11,936	19,446	12,036
Current year actuarial gain (loss)	(56,268)	(927)	(69,349)
Total change in pension obligation, net of tax	49,199	(10,659)	63,991
Total recognized in net periodic benefit cost and other comprehensive income	61,135	8,787	76,027
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	2,567	3,341	832
Interest cost	6,775	6,393	1,488
Expected return on assets	(11,101)	(11,482)	(2,807)
Defined Benefit Plan, Curtailments	0	(2,076)	0
Total pension expense	(1,759)	(1,748)	(487)
Current year actuarial gain (loss)	(14,157)	(458)	(9,123)
Total change in pension obligation, net of tax	14,157	(1,618)	9,123
Total recognized in net periodic benefit cost and other comprehensive income	$ 12,398	$ (3,366)	$ 8,636

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
BancShares Plan
Assumptions used to determine the benefit obligations
Discount rate	4.30%	4.68%
Rate of compensation increase	4.00%	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.68%	4.27%	4.90%
Rate of compensation increase	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.50%	7.50%
Bancorporation Plan
Assumptions used to determine the benefit obligations
Discount rate	4.30%	4.68%
Rate of compensation increase	4.00%	4.00%
Assumptions used to determine net periodic benefit cost
Discount rate	4.68%	4.27%	4.35%
Rate of compensation increase	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.50%	7.50%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 600,616	$ 550,025	$ 544,956
Actual % of Plan Assets	100.00%	100.00%
BancShares Plan | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 517,858	$ 469,647
BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	82,758	80,378
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	152,084	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	124,940	126,392
Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	27,144	24,501
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]
Plan assets	$ 60,674	$ 26,613
Actual % of Plan Assets	10.00%	5.00%
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 | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 60,674	$ 26,613
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]
Plan assets	$ 3,839	$ 13,437
Actual % of Plan Assets	2.49%	8.90%
Cash and equivalents | Bancorporation Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Cash and equivalents | Bancorporation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	1.00%
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	$ 3,839	$ 13,437
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]
Plan assets	$ 66,015	$ 267,037
Actual % of Plan Assets	54.00%	63.00%
Equity Securities | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%	55.00%
Equity Securities | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%	65.00%
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	$ 65,964	$ 267,037
Equity Securities | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	51	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]
Plan assets	$ 18,274	$ 80,676
Target Allocation	60.00%
Actual % of Plan Assets	58.00%	63.00%
Equity Securities | Bancorporation Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Equity Securities | Bancorporation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
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	$ 18,260	$ 80,676
Equity Securities | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	14	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	28.00%	26.00%
Debt Securities | BancShares Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%	25.00%
Debt Securities | BancShares Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%	40.00%
Debt Securities | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	31.00%	22.00%
Debt Securities | Bancorporation Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%
Debt Securities | Bancorporation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%
Equity mutual funds | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 256,976	$ 78,645
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	252,710	78,645
Equity mutual funds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,266	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
Defined Benefit Plan Disclosure [Line Items]
Plan assets	69,978	15,005
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	68,832	15,005
Equity mutual funds | Bancorporation Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,146	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
Defined Benefit Plan Disclosure [Line Items]
Plan assets	57,890	58,526
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	47,647	48,957
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	10,243	9,569
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
Defined Benefit Plan Disclosure [Line Items]
Plan assets	15,407	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	8,919	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	6,488	16,490
US government and government agency securities | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Corporate Bonds | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	68,198	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	0
Corporate Bonds | BancShares Plan | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	68,198	70,809
Corporate Bonds | BancShares Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Corporate Bonds | Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	19,496	8,011
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	19,496	8,011
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
Defined Benefit Plan Disclosure [Line Items]
Plan assets	42,849	17,351
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	42,849	17,351
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	0
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
Defined Benefit Plan Disclosure [Line Items]
Plan assets	11,822	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	11,822	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	0
Fixed Income Mutual Funds | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Alternative investments | BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 48,014	$ 31,044
Actual % of Plan Assets	8.00%	6.00%
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	30.00%	8.00%
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	$ 48,014	$ 31,044
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]
Plan assets	$ 13,268	9,090
Actual % of Plan Assets	9.00%
Defined Benefit Plan, Target Allocation Percentage	0.05
Alternative investments | Bancorporation Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Alternative investments | Bancorporation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
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	$ 13,268	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	0
Alternative investments | Bancorporation Plan | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 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, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 50,000	$ 30,000
BancShares Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	587,327	533,125
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	50,000	30,000
2,014	23,932
2,015	25,377
2,016	26,868
2,017	28,499
2,018	30,193
2019-2023	176,048
Bancorporation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	143,676	$ 131,879
2,014	6,227
2,015	6,618
2,016	6,903
2,017	7,287
2,018	7,821
2019-2023	$ 45,713

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, 2016	Dec. 31, 2015
Present Value Of Accrued Liability [Roll Forward]
Present value of accrued liability as of January 1	$ 39,878	$ 43,211
Benefit expense	3,232	1,386
Benefits paid	(4,194)	(4,485)
Benefits forfeited	(319)	(234)
Present value of accrued liability as of December 31	$ 38,597	$ 39,878

Other Noninterest Income and 98

Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 34,170	$ 36,359	$ 29,277
Other Noninterest Expense	200,047	189,892	152,835
PCI Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	20,100	21,200	16,200
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,496	14,406	10,834
Cardholder Reward Programs
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,615	11,069	8,252
Processing Fees Paid To Third Parties
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,976	18,779	17,089
Collection
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	8,889	9,649	11,595
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,931	8,925	10,168
Core Deposit Intangible Amortization [Member]
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	16,851	18,892	6,955
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,239	12,431	11,461
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 109,050	$ 95,741	$ 76,481

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 14,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	357	$ 298	$ 1,127
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance of unrecognized tax benefits	5,975	3,865	2,823
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(327)	(79)	0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	23,231	2,189	1,042
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0	0
Ending balance of unrecognized tax benefits	28,879	5,975	3,865
Current tax expense
Federal	84,946	105,367	84,430
State	7,493	16,111	13,941
Total current tax expense	92,439	121,478	98,371
Deferred Income Tax Expense (Benefit)
Federal	23,144	(2,758)	(30,658)
State	10,002	3,308	(2,681)
Total deferred tax expense (benefit)	33,146	550	(33,339)
Total income tax expense	$ 125,585	122,028	65,032
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory rate	35.00%
Income taxes at statutory rates	$ 122,874	116,345	71,258
Nontaxable income on loans, leases and investments, net of nondeductible expenses	(2,901)	(3,020)	(1,832)
State and local income taxes, including change in valuation allowance, net of federal income tax benefit	11,372	12,622	7,319
Effective Income Tax Rate Reconciliation, Acquisition Stock Settlement, Amount	(98)	0	(10,185)
Tax credits	(4,138)	(3,060)	(2,896)
Other, net	(1,524)	(859)	1,368
Total income tax expense	125,585	122,028	$ 65,032
Deferred Tax Assets, Net [Abstract]
Allowance for loan and lease losses	80,939	78,878
Pension liability	15,679	7,206
Executive separation from service agreements	14,278	9,856
State operating loss carryforwards	0	21
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	5,019	0
Unrealized loss on cash flow hedge	0	537
Net unrealized loss on securities included in accumulated other comprehensive loss	26,832	9,379
Deferred Tax Assets, Property, Plant and Equipment	133	13,195
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences, Amount	52,579	66,456
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	10,504	10,772
Other	26,663	29,279
Gross deferred tax asset	232,626	225,579
Lease financing activities	11,651	15,492
Net deferred loan fees and costs	10,867	6,051
Intangible assets	6,335	2,040
Deferred Tax Liability, Mark to Market Section 475, Amount	22,656	31,486
Other	8,501	12,026
Deferred tax liability	60,010	67,095
Net deferred tax assets	$ 172,616	$ 158,484

Transactions with Related Pe100

Transactions with Related Persons (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 79	$ 1,045
New loans	314	5
Repayments	(40)	(971)
Ending balance	353	79	$ 1,045
Unfunded loan commitments available to related parties	$ 1,800	$ 1,400
Revenue from related parties			17,200
Revenue from largest individual institution related parties			$ 16,800

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Incremental interest expense paid to interest rate swap counterparties	$ 1,488	$ 3,294	$ 3,321
2011 Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount		93,500
Notional amount of interest rate derivatives	0
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 0	$ 1,429

Derivatives (Schedule Of Intere

Derivatives (Schedule Of Interest Rate Swaps) (Details) - 2011 Interest Rate Swap - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 0	$ 1,429
Derivative, Notional Amount		$ 93,500

Goodwill and Intangible Asse103

Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2016USD ($)$ / loansRate	Dec. 31, 2015USD ($)$ / loansRate	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Servicing Asset at Amortized Cost [Line Items]
Servicing Asset at Amortized Cost	$ 20,415,000	$ 19,351,000	$ 16,688,000	$ 16,000
Servicing Asset at Amortized Cost, Additions	5,931,000	5,910,000	727,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	4,000	95,000	850,000	$ 0
Residential Mortgage Loans Serviced	$ 2,490,000,000	$ 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	10.42%	11.01%
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	$ 5,800,000	$ 5,400,000	600,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans	62.75	56.61
Amortization	$ (4,958,000)	$ (4,002,000)	(919,000)
Goodwill [Roll Forward]
Beginning goodwill	139,773,000	139,773,000
Ending goodwill	150,601,000	139,773,000	139,773,000
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	90,986,000
Finite Lived Intangible Assets Removed Due To Branch Sale	0	(85,000)
Amortization	(16,850,000)	(18,892,000)
Ending balance	78,040,000	90,986,000
Finite-Lived Intangible Assets [Abstract]
Gross balance	118,041,000	115,201,000
Accumulated amortization	(60,416,000)	(43,566,000)
Carrying value	57,625,000	71,635,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,015	14,556,000
2,016	12,220,000
2,017	9,892,000
2,018	7,838,000
2,019	5,996,000
Other Intangible Assets, Net	57,625,000	71,635,000	89,922,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries)	(91,000)	(755,000)	850,000
1st Financial
Servicing Asset at Amortized Cost [Line Items]
Servicing Asset at Fair Value, Additions	$ 0	0	148,000
Goodwill [Roll Forward]
Useful life	3 months
Cordia Bancorp Inc.
Goodwill [Roll Forward]
Goodwill acquired	$ 10,828,000	0
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	2,210,000	0
Capitol City Bank and Trust
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	0	690,000
North Milwaukee State Bank
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	240,000	0
First CornerStone Bank
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	390,000	0
Bancorporation
Servicing Asset at Amortized Cost [Line Items]
Servicing Asset at Fair Value, Additions	$ 0	$ 0	$ 17,566,000
Goodwill [Roll Forward]
Useful life	5 years 6 months
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	9.45%	9.31%
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	10.45%	10.31%
Core deposits | Minimum
Goodwill [Roll Forward]
Useful life	2 years
Core deposits | Maximum
Goodwill [Roll Forward]
Useful life	9 years

Shareholders' Equity, Divide104

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)voteshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
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	$ 3,000	$ 6,000
Subordinated Debt, Annual Tier 2 Discount Percentage	20.00%
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status	$ 928,700
Average Required Maintence Of Non Interst Bearing Reserve Balance	$ 575,700
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	200,000
Stock Repurchased During Period, Shares | shares		0
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	0
Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries	$ 90,055	$ 75,006	$ 30,000
BancShares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	2,995,557	2,831,242
Capital Required for Capital Adequacy	3,339,986	3,140,212
Leverage Capital Required for Capital Adequacy	$ 2,995,557	$ 2,831,242
Tier 1 Risk Based Capital to Risk Weighted Assets	12.42%	12.65%
Capital to Risk Weighted Assets	13.85%	14.03%
Leverage Capital to Average Assets	9.05%	8.96%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Common equity Tier 1	$ 2,995,557	$ 2,799,163
Common equity Tier 1 to risk-weighted assets	12.42294%	12.50965%
Common equity Tier 1 required to be well capitalized to risk-weighted assets	6.50%	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%
Capital Conservation Buffer	5.85%
FCB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	$ 2,942,829	$ 2,821,475
Capital Required for Capital Adequacy	3,172,757	3,038,070
Leverage Capital Required for Capital Adequacy	$ 2,942,829	$ 2,821,475
Tier 1 Risk Based Capital to Risk Weighted Assets	12.25%	12.64%
Capital to Risk Weighted Assets	13.21%	13.61%
Leverage Capital to Average Assets	8.94%	8.95%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Common equity Tier 1	$ 2,942,829	$ 2,821,475
Common equity Tier 1 to risk-weighted assets	12.25305%	12.63988%
Common equity Tier 1 required to be well capitalized to risk-weighted assets	6.50%	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%
Capital Conservation Buffer	5.21%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 109,800	$ 85,600
FDIC loss share receivable	4,172	4,054	$ 28,701	$ 93,397
FDIC shared-loss payable	97,008	126,453
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate	200,000
Commitments to Extend Credit
Guarantor Obligations [Line Items]
Unused Commitments to Extend Credit	8,810,000	7,950,000
Affordable Housing Program Obligation	57,100	41,800
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor obligations amount	$ 83,750	77,939
Recourse Obligation on Mortgage Loans Sold
Guarantor Obligations [Line Items]
Recourse Period, Maximum1	180 days
Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Reserve for estimated losses arising from repurchase of loans	$ 3,000	$ 3,000
Each Individual Advance [Member]
Guarantor Obligations [Line Items]
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate	$ 100,000

Accumulated Other Comprehens106

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), before Tax		$ (214,481)	$ (104,352)
Long-term obligations		944,675	924,905		$ 710,097
Deferred tax expense (benefit)		(79,289)	(39,912)
Accumulated other comprehensive income (loss), net of tax		(135,192)	(64,440)		(52,981)
Income taxes		(125,585)	(122,028)		(65,032)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	12,351	81
Securities gains (losses)		26,673	10,817		29,096
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), before Tax		(72,707)	(24,504)
Deferred tax expense (benefit)		(26,832)	(9,379)
Accumulated other comprehensive income (loss), net of tax	[2]	(45,875)	(15,125)		5,098
Income taxes	[1]	(9,869)	(4,138)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1],[2]	16,804	6,679
Securities gains (losses)	[1]	26,673	10,817
Funded Status of Defined Benefit Plan
Accumulated Other Comprehensive Income (Loss), before Tax		(141,774)	(78,419)
Deferred tax expense (benefit)		(52,457)	(29,996)
Accumulated other comprehensive income (loss), net of tax	[2]	(89,317)	(48,423)		(55,415)
Income taxes	[1]	2,616	4,988
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1],[2]	(4,453)	(6,598)
Employee Benefits, prior service costs	[1]	(210)	(210)
Reclassification adjustment for losses included in income before income taxes	[1]	(6,859)	(11,376)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax		(7,069)	(11,586)	[1]
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), before Tax		0	(1,429)
Deferred tax expense (benefit)		0	(537)
Accumulated other comprehensive income (loss), net of tax	[2]	0	(892)		$ (2,664)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	$ 0	$ 0
[1]	Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated Other Comrehensive

Accumulated Other Comrehensive Loss (Components of AOCI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (64,440)	$ (52,981)
Other comprehensive (loss) income before reclassifications		(58,401)	(11,378)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	(12,351)	(81)
Net current period other comprehensive (loss) income		(70,752)	(11,459)	$ (27,713)
Ending balance		(135,192)	(64,440)	(52,981)
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	(892)	(2,664)
Other comprehensive (loss) income before reclassifications	[2]	892	1,772
Amounts reclassified from accumulated other comprehensive (loss) income	[2]	0	0
Net current period other comprehensive (loss) income	[2]	892	1,772
Ending balance	[2]	0	(892)	(2,664)
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	(15,125)	5,098
Other comprehensive (loss) income before reclassifications	[2]	(13,946)	(13,544)
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[2]	(16,804)	(6,679)
Net current period other comprehensive (loss) income	[2]	(30,750)	(20,223)
Ending balance	[2]	(45,875)	(15,125)	5,098
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	(48,423)	(55,415)
Other comprehensive (loss) income before reclassifications	[2]	(45,347)	394
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[2]	4,453	6,598
Net current period other comprehensive (loss) income	[2]	(40,894)	6,992
Ending balance	[2]	$ (89,317)	$ (48,423)	$ (55,415)
[1]	Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Accumulated Other Comprehens108

Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Long-term obligations		$ 944,675	$ 924,905		$ 710,097
Securities gains (losses)		26,673	10,817		29,096
Income taxes		(125,585)	(122,028)		$ (65,032)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1]	(12,351)	(81)
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]	26,673	10,817
Income taxes	[1]	(9,869)	(4,138)
Amounts reclassified from accumulated other comprehensive income, net of tax	[1],[2]	(16,804)	(6,679)
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]	(6,859)	(11,376)
Total before taxes		(7,069)	(11,586)	[1]
Income taxes	[1]	2,616	4,988
Amounts reclassified from accumulated other comprehensive income, net of tax	[1],[2]	$ 4,453	$ 6,598
[1]	Amounts in parentheses indicate debits to profit/loss.
[2]	All amounts are net of tax. Amounts in parentheses indicate debits.

Parent Company Financial Sta109

Parent Company Financial Statements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Overnight investments	$ 1,872,594,000	$ 2,063,132,000
Investment securities	7,006,580,000	6,861,293,000
Other assets	471,412,000	417,391,000
Total assets	32,990,836,000	31,475,934,000
Liabilities and Shareholders' Equity
Short-term borrowings	603,487,000	594,733,000
Long-term obligations	832,942,000	704,155,000
Other liabilities	283,629,000	247,729,000
Stockholders' equity	3,012,427,000	2,872,109,000	$ 2,687,594,000	$ 2,071,462,000
Total liabilities and shareholders' equity	32,990,836,000	31,475,934,000
Income Statement [Abstract]
Interest expense	43,082,000	44,304,000	50,351,000
Net interest income (loss)	944,675,000	924,905,000	710,097,000
Income tax benefit	125,585,000	122,028,000	65,032,000
Net income	225,482,000	210,386,000	138,562,000
OPERATING ACTIVITIES
Net income	225,482,000	210,386,000	138,562,000
Net amortization of premiums and accretion of discounts	(44,618,000)	(85,066,000)	(48,374,000)
Gain on elimination of acquired debt	0	0	(1,988,000)
Securities (gains) losses	(26,673,000)	(10,817,000)	(29,096,000)
Other than temporary impairment on securities	0
Change in other assets	(27,656,000)	(12,904,000)	(72,680,000)
Change in other liabilities	(25,520,000)	14,458,000	1,319,000
INVESTING ACTIVITIES
Net change in overnight investments	233,433,000	(338,213,000)	221,730,000
Business acquisitions, net of cash acquired	(727,000)	123,137,000	182,370,000
Net change in short-term borrowings	(33,072,000)	(397,952,000)	(25,321,000)
Retirement of long-term obligations	(11,213,000)	(5,896,000)	(54,301,000)
Stock issuance costs	0	0	(619,000)
Cash dividends paid	(14,412,000)	(18,015,000)	(11,543,000)
Net change in cash	5,655,000	(70,096,000)	70,583,000
Cash and due from banks at beginning of period	534,086,000	604,182,000	533,599,000
Cash and due from banks at end of period	539,741,000	534,086,000	604,182,000
Cash payments for
Interest	44,998,000	46,785,000	48,894,000
Income taxes	108,741,000	136,900,000	127,970,000
Parent
Assets
Cash	8,278,000	24,869,000
Overnight investments	26,157,000	1,416,000
Investment securities	95,564,000	21,137,000
Investment in Banking Subsidiaries	2,932,048,000	2,874,581,000
Investment in Other Subsidiaries	41,066,000	43,117,000
Other assets	92,787,000	73,944,000
Total assets	3,195,900,000	3,039,064,000
Liabilities and Shareholders' Equity
Long-term obligations	126,861,000	133,775,000
Due to Affiliate	56,323,000	29,682,000
Other liabilities	289,000	3,498,000
Stockholders' equity	3,012,427,000	2,872,109,000
Total liabilities and shareholders' equity	3,195,900,000	3,039,064,000
Income Statement [Abstract]
Interest income	1,110,000	645,000	1,784,000
Interest expense	6,067,000	6,793,000	9,694,000
Net interest income (loss)	(4,957,000)	(6,148,000)	(7,910,000)
Dividends from subsidiaries	90,055,000	75,006,000	30,000,000
Dividend Income, Banking Subsidiaries			82,419,000
Dividends from subsidiaries	0	23,500,000	0
Other income (loss)	9,330,000	1,870,000	33,600,000
Other operating expense	5,641,000	2,634,000	6,534,000
Income before income tax benefit and equity in undistributed net income of subsidiaries	88,787,000	91,594,000	101,575,000
Income tax benefit	(730,000)	(2,618,000)	(2,590,000)
Income before equity in undistributed net income of subsidiaries	89,517,000	94,212,000	104,165,000
Excess distributions (undistributed ) net income of subsidiaries	(135,965,000)	(116,174,000)	(34,397,000)
Net income	225,482,000	210,386,000	138,562,000
OPERATING ACTIVITIES
Net income	225,482,000	210,386,000	138,562,000
Excess distributions (undistributed ) net income of subsidiaries	(135,965,000)	(116,174,000)	(34,397,000)
Net amortization of premiums and accretion of discounts	(6,838,000)	(2,712,000)	594,000
Gain on elimination of acquired debt	0	0	(1,988,000)
Securities (gains) losses	(9,446,000)	(236,000)	(29,126,000)
Change in other assets	(20,845,000)	(3,070,000)	93,385,000
Change in other liabilities	(1,780,000)	(1,157,000)	2,250,000
Net cash provided by (Used in) Operating Activities	50,608,000	87,037,000	169,280,000
INVESTING ACTIVITIES
Net change in due from subsidiaries	0	295,994,000	(150,328,000)
Net change in overnight investments	(24,741,000)	(1,416,000)	0
Purchases of investment securities	(93,003,000)	(7,818,000)	(33,243,000)
Maturities and sales of investment securities	38,316,000	100,586,000	114,208,000
Investment in subsidiaries	0	0	1,579,000
Business acquisitions, net of cash acquired	0	0	(24,772,000)
Net Cash Provided by (Used in) Investing Activities	(79,428,000)	387,346,000	(92,556,000)
Change in Due to Subsidiaries	26,641,000	29,682,000	0
Net change in short-term borrowings	0	(485,207,000)	(1,211,000)
Retirement of long-term obligations	0	0	(52,372,000)
Stock issuance costs	0	0	(619,000)
Cash dividends paid	(14,412,000)	(18,015,000)	(11,543,000)
Net cash used by financing activities	12,229,000	(473,540,000)	(65,745,000)
Net change in cash	(16,591,000)	843,000	10,979,000
Cash and due from banks at beginning of period	24,869,000	24,026,000	13,047,000
Cash and due from banks at end of period	$ 8,278,000	$ 24,869,000	$ 24,026,000

Subsequent Event (Details)

Subsequent Event (Details) - USD ($) $ in Thousands	Jan. 13, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Deposits		$ 28,161,343	$ 26,930,755
Loans and Leases Receivable, Gross		21,737,878	$ 20,239,990
Harvest Community Bank [Member]
Subsequent Event [Line Items]
Deposits		122,200
Loans and Leases Receivable, Gross		$ 98,800
Harvest Community Bank [Member] | Subsequent Event
Subsequent Event [Line Items]
Business Combination Cash Received From FDIC In Acquisition	$ 22,800