Hancock Whitney (HWC) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Jan. 31, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	HANCOCK WHITNEY CORP
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 4
Entity Central Index Key	750,577
Trading Symbol	hwc
Amendment Flag	false
Document Type	10-K
Document Fiscal Period Focus	FY
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		85,686,848

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 383,372	$ 386,948
Interest-bearing bank deposits	110,579	92,157
Federal funds sold	515	227
Securities available for sale, at fair value (amortized cost of $2,755,806 and $2,949,057)	2,691,037	2,910,869
Securities held to maturity (fair value of $2,935,856 and $2,962,010)	2,979,547	2,977,511
Loans held for sale	28,150	39,865
Loans	20,026,411	19,004,163
Less: allowance for loan losses	(194,514)	(217,308)
Loans, net	19,831,897	18,786,855
Property and equipment, net of accumulated depreciation of $225,969 and $214,998	353,668	333,663
Prepaid expense	35,047	28,015
Other real estate and foreclosed assets, net	26,270	27,542
Accrued interest receivable	86,681	82,191
Goodwill	790,972	745,523
Other intangible assets, net	96,151	90,640
Life insurance contracts	549,300	541,081
Deferred tax asset, net	22,967	53,979
Other assets	249,754	239,020
Total assets	28,235,907	27,336,086
Deposits
Noninterest-bearing	8,499,027	8,307,497
Interest-bearing	14,651,158	13,945,705
Total deposits	23,150,185	22,253,202
Short-term borrowings	1,589,128	1,703,890
Long-term debt	224,993	305,513
Accrued interest payable	12,267	8,680
Other liabilities	177,994	179,852
Total liabilities	25,154,567	24,451,137
Stockholders' equity:
Common Stock	292,716	292,716
Capital surplus	1,725,741	1,718,117
Retained earnings	1,243,592	1,008,518
Accumulated other comprehensive loss, net	(180,709)	(134,402)
Total stockholders' equity	3,081,340	2,884,949
Total liabilities and stockholders' equity	$ 28,235,907	$ 27,336,086
Preferred shares authorized (par value of $20.00 per share)	50,000,000	50,000,000
Preferred shares issued
Preferred shares outstanding
Common shares authorized (par value of $3.33 per share)	350,000,000	350,000,000
Common shares issued	87,903,000	87,903,000
Common shares outstanding	85,643,000	85,200,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets [Abstract]
Securities available for sale, amortized cost	$ 2,755,806	$ 2,949,057
Securities held to maturity, fair value	2,935,856	2,962,010
Property and equipment, accumulated depreciation	$ 225,969	$ 214,998
Preferred stock, par value per share	$ 20	$ 20
Common stock, par value per share	$ 3.33	$ 3.33

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans, including fees	$ 877,875	$ 772,030	$ 625,023
Loans held for sale	946	851	1,022
Securities-taxable	124,720	102,013	91,099
Securities-tax exempt	21,951	22,235	13,222
Short-term investments	2,776	3,452	1,801
Total interest income	1,028,268	900,581	732,167
Interest expense:
Deposits	130,715	76,546	48,934
Short-term borrowings	36,096	15,735	4,065
Long-term debt	12,619	15,988	20,052
Total interest expense	179,430	108,269	73,051
Net interest income	848,838	792,312	659,116
Provision for loan losses	36,116	58,968	110,659
Net interest income after provision for loan losses	812,722	733,344	548,457
Noninterest income:
Service charges on deposit accounts	85,272	83,166	74,187
Trust fees	55,488	44,538	46,589
Bank card and ATM fees	60,440	53,779	47,427
Investment and annuity fees and insurance commissions	25,348	23,741	22,978
Secondary mortgage market operations	15,632	15,209	16,282
Amortization of loss share receivable		(2,427)	(5,918)
Net gain on sales of assets	24,654	7,478	7,814
Securities transactions	(25,480)		1,754
Other income	43,786	42,297	39,668
Total noninterest income	285,140	267,781	250,781
Noninterest expense:
Compensation expense	330,968	320,096	287,783
Employee benefits	73,727	71,817	66,830
Personnel expense	404,695	391,913	354,613
Net occupancy expense	47,795	47,869	41,296
Equipment expense	16,367	14,841	13,663
Data processing expense	74,129	66,385	58,619
Professional services expense	41,579	40,235	29,561
Amortization of intangibles	22,050	22,417	19,781
Deposit insurance and regulatory fees	31,423	29,627	23,499
Other real estate income	(2,985)	(2,669)	(3,481)
Other expense	80,693	82,073	74,764
Total noninterest expense	715,746	692,691	612,315
Income before income taxes	382,116	308,434	186,923
Income taxes	58,346	92,802	37,627
Net income	$ 323,770	$ 215,632	$ 149,296
Earnings per common share-basic	$ 3.72	$ 2.49	$ 1.87
Earnings per common share-diluted	3.72	2.48	1.87
Dividends paid per share	$ 1.02	$ 0.96	$ 0.96
Weighted average shares outstanding-basic	85,355	84,695	77,850
Weighted average shares outstanding-diluted	85,521	84,963	77,949

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 323,770	$ 215,632	$ 149,296
Other comprehensive income (loss) before income taxes:
Net change in unrealized loss on available for sale securities and hedges	(52,757)	(425)	(57,346)
Reclassification of net losses realized and included in earnings	34,966	5,801	4,016
Valuation adjustment for pension plan amendment		17,315
Other valuation adjustments for employee benefit plan	45,198	10,929	12,748
Amortization of unrealized net loss on securities transferred to held to maturity	3,296	3,786	3,830
Other comprehensive income (loss) before income taxes	(59,693)	15,548	(62,248)
Income tax expense (benefit)	(13,386)	4,088	(22,311)
Other comprehensive income (loss) net of income taxes	(46,307)	11,460	(39,937)
Comprehensive income	$ 277,463	$ 227,092	$ 109,359

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]		Total
Balance at Dec. 31, 2015	$ 291,346	$ 1,424,448	$ 777,944	$ (80,595)		$ 2,413,143
Balance, Shares Issued at Dec. 31, 2015	87,491
Net income			149,296			149,296
Other comprehensive loss				(39,937)		(39,937)
Comprehensive income			149,296	(39,937)		109,359
Cash dividends declared			(76,551)			(76,551)
Common stock activity, long-term incentive plan	$ 12	12,991				13,003
Common stock activity, long-term incentive plan, Shares Issued	4
Issuance of stock from dividend reinvestment and stock purchase plans		1,515				1,515
Common stock issued in public stock offering (6,325 shares)		259,299				259,299
Balance at Dec. 31, 2016	$ 291,358	1,698,253	850,689	(120,532)		2,719,768
Balance, Shares Issued at Dec. 31, 2016	87,495
Net income			215,632			215,632
Other comprehensive loss				11,460		11,460
Comprehensive income			215,632	11,460		227,092
Reclassification of certain tax effects from accumulated other comprehensive loss			25,330	(25,330)	[1]
Cash dividends declared			(83,266)			(83,266)
Common stock activity, long-term incentive plan	$ 1,358	16,644	133			18,135
Common stock activity, long-term incentive plan, Shares Issued	408
Issuance of stock from dividend reinvestment and stock purchase plans		3,220				3,220
Balance at Dec. 31, 2017	$ 292,716	1,718,117	1,008,518	(134,402)		$ 2,884,949
Balance, Shares Issued at Dec. 31, 2017	87,903					87,903
Net income			323,770			$ 323,770
Other comprehensive loss				(46,307)		(46,307)
Comprehensive income			323,770	(46,307)		277,463
Cash dividends declared			(88,838)			(88,838)
Common stock activity, long-term incentive plan		12,482	142			12,624
Common stock activity, long-term incentive plan, Shares Issued
Issuance of stock from dividend reinvestment and stock purchase plans		3,409				3,409
Purchase of common stock under stock buyback program (200,000 shares)		(8,267)				(8,267)
Balance at Dec. 31, 2018	$ 292,716	$ 1,725,741	$ 1,243,592	$ (180,709)		$ 3,081,340
Balance, Shares Issued at Dec. 31, 2018	87,903					87,903
[1]	Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Repurchased of common stock shares	$ 200,000
Common stock issued in public stock offering, Shares			6,325
Retained Earnings [Member]
Cash dividends declared, per common share	$ 1.02	$ 0.96	$ 0.96

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 323,770	$ 215,632	$ 149,296
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,532	28,142	28,363
Provision for loan losses	36,116	58,968	110,659
Gain on other real estate owned	(3,355)	(2,839)	(4,444)
Deferred tax (benefit) expense	45,214	49,831	(7,839)
Increase in cash surrender value of life insurance contracts	(7,850)	(14,959)	(11,112)
Gain on sale of Visa Class B common shares	(33,229)
(Gain) loss on sales of securities available for sale	25,480		(1,754)
(Gain) loss on the sale of loans	6,991	(3,363)	(4,414)
Loss on sale of business	1,145
(Gain) loss on disposal of other assets	1,897	1,587	(3,426)
Net (increase) decrease in loans held for sale	11,986	3,317	(14,267)
Net amortization of securities premium/discount	33,161	33,244	29,048
Amortization of intangibles	22,050	22,417	19,781
Amortization of FDIC loss share receivable		2,427	5,918
Stock-based compensation expense	19,793	17,633	14,266
Contribution to pension plan	(39,000)		(15,000)
Increase (decrease) in interest payable and other liabilities	(9,397)	2,307	10,315
Net payments (to) from FDIC for loss share claims		2,299	(3,134)
Decrease in FDIC loss share receivable		8,613	5,667
(Increase) decrease in other assets	(13,811)	(9,836)	15,197
Other, net	1,691	(4,335)	20,795
Net cash provided by operating activities	449,184	411,085	343,915
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	455,162	213,877	173,215
Proceeds from maturities of securities available for sale	327,141	338,843	408,311
Purchases of securities available for sale	(629,976)	(742,279)	(1,071,869)
Proceeds from maturities of securities held to maturity	359,312	373,088	425,453
Purchases of securities held to maturity	(375,770)	(863,457)	(563,661)
Net (increase) decrease in short-term investments	(18,710)	351,087	487,378
Proceeds from sale of loans	166,462	59,483	177,645
Net increase in loans	(1,358,077)	(1,051,628)	(1,331,125)
Purchase of life insurance contracts	(1,822)	(50,000)	(40,000)
Purchases of property and equipment	(50,664)	(20,297)	(19,272)
Proceeds from the sale of Visa Class B shares	42,858
Proceeds from sales of property and equipment	60	1,853	7,445
Proceeds from sales of other real estate	17,214	24,324	24,624
Cash received in excess of cash paid for acquisitions	141,769	476,609
Proceeds from the sale of business, net of cash sold	77,648
Other, net	491	(6,824)	825
Net cash used in investing activities	(846,902)	(895,321)	(1,321,031)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	679,669	900,427	1,075,370
Net decrease in short-term borrowings	(114,762)	(118,151)	(198,238)
Repayments of long-term debt	(90,216)	(204,111)	(21,271)
Issuance of long-term debt	20,610	165	6,838
Dividends paid	(88,838)	(83,266)	(76,551)
Payroll tax remitted on net share settlement of equity awards	(8,695)	(11,881)	(3,178)
Repurchase of common stock	(8,267)
Proceeds from exercise of stock options	1,232	12,092	2,147
Proceeds from issuance of common stock in public offering			259,299
Proceeds from dividend reinvestment and stock purchase plan	3,409	3,220	1,515
Net cash provided by financing activities	394,142	498,495	1,045,931
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(3,576)	14,259	68,815
CASH AND DUE FROM BANKS, BEGINNING	386,948	372,689	303,874
CASH AND DUE FROM BANKS, ENDING	383,372	386,948	372,689
SUPPLEMENTAL INFORMATION
Income taxes paid	7,283	45,092	30,184
Interest paid	175,382	108,702	69,624
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 22,393	$ 19,140	$ 16,314

Summary of Significant Accounti

Summary of Significant Accounting Policies and Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies and Recent Accounting Pronouncements [Abstract]
Summary of Significant Accounting Policies and Recent Accounting Pronouncements	Note 1. Summary of Significant Accounting Policies and Recent Accounting Pronouncements  DESCRIPTION OF BUSINESS  Hancock Whitney Corporation (the “Company”) is a financial services company that provides a comprehensive network of full-service financial choices to the Gulf South region through its bank subsidiary, Hancock Whitney Bank (the “Bank”), a Mississippi state bank . The Bank offers a broad range of traditional and online banking services to commercial, small business and retail customers, providing a variety of transaction and savings deposit products, treasury management services, secured and unsecured loan products (including revolving credit facilities), and letters of credit and similar financial guarantees. The Bank also provides trust and investment management services to retirement plans, corporations and individuals. The Company also offers investment brokerage services through its broker-dealer subsidiary, Hancock Whitney I nvestment Services, Inc., a non bank subsidiary of the holding company. The Company primarily operates across the Gulf South region comprised of southern Mississippi; southern and central Alabama; southern Louisiana; the northern, central, and panhandle regions of Florida; and the Houston, Texas area. In addition, the Company operates a loan production office in Nashville, Tennessee and trust and investment management offices in Texas, New York and New Jersey.  The Company was organized in 1984 as a bank holding company registered under the Bank Holding Company Act of 1956, as amended. In 2002, the Company qualified as a financial holding company, giving it broader powers. The corporate headquarters of the Company is in Gulfport, Mississippi. On May 25, 2018, the Company changed its name from Hancock Holding Company to Hancock Whitney Corporation, and its wholly- owned banking subsidiary changed its name from Whitney Bank to Hancock Whitney Bank. In connection with the name change, the Company changed its stock ticker symbol from “HBHC” to “HWC” on the NASDAQ Global Select Market. In addition, t he ticker for the Company’s exchange-traded debt (subordinated notes) changed from “HBHCL” to “HWCPL.”  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the U.S. (U.S. GAAP) and those generally practiced within the banking industry. Following is a summary of the more significant accounting policies.  Basis of Presentation  The consolidated financial statements include the accounts of the Company and all other entities in which the Company has a controlling interest. Significant intercompany transactions and balances have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation.  Use of Estimates  The accounting principles the Company follows and the methods for applying these principles conform to U.S. GAAP and general practices followed by the banking industry. These accounting principles and practices require management to make estimates and assumptions about future events that affect the amounts reported in the consolidated financial statements and the accompanying notes. Actual results could differ from those estimates.  Fair Value Accounting  U.S. GAAP requires the use of fair values in determining the carrying values of certain assets and liabilities in the financial statements, as well as for specific disclosures about certain assets and liabilities.  Accounting guidance establishes a fair value hierarchy that prioritizes the inputs to these valuation techniques used to measure fair value giving preference to quoted prices in active markets (level 1) and the lowest priority to unobservable inputs such as a reporting entity’s own data or information or assumptions developed from this data (level 3). Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in markets that are not active, observable inputs other than quoted prices, such as interest rates and yield curves, and inputs that are derived principally from or corroborated by observable market data by correlation or other means.  Business Combinations  Business combinations are accounted for under the purchase method of accounting. Purchased assets, including identifiable intangibles, and assumed liabilities are recorded at their respective acquisition date fair values. If the fair value of net assets purchased exceeds the consideration given, a bargain purchase gain is recognized. If the consideration given exceeds the fair value of the net assets received or if the fair value of the net liabilities assumed exceeds the consideration received, goodwill is recognized. Fair values are subject to refinement for up to one year after the closing date of an acquisition as information relative to closing date fair values becomes available. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date with no carryover of the related allowance for loan losses.  All identifiable intangible assets that are acquired in a business combination are recognized at the acquisition date fair value. Identifiable intangible assets are recognized separately if they arise from contractual or other legal rights or if they are separable (i.e., capable of being sold, transferred, licensed, rented, or exchanged separately from the entity).  Cash and Due from Banks  The Company considers only cash on hand, cash items in process of collection and balances due from financial institutions as cash and cash equivalents.  Securities  Securities are classified as trading, held to maturity or available for sale. Management determines the appropriate classification of debt and equity securities at the time of purchase and reevaluates this classification periodically as conditions change that could require reclassification.  Available for sale securities are stated at fair value. Unrealized holding gains and unrealized holding losses, other than those determined to be other than temporary, are reported net of tax in other comprehensive income and in accumulated other comprehensive income (“AOCI”) until realized.  Securities that the Company both positively intends and has the ability to hold to maturity are classified as securities held to maturity and are carried at amortized cost. The intent and ability to hold are not considered satisfied when a security is available to be sold in response to changes in interest rates, prepayment rates, liquidity needs or other reasons as part of an overall asset/liability management strategy.  Premiums and discounts on securities, both those held to maturity and those available for sale, are amortized and accreted to income as an adjustment to the securities’ yields using the effective interest method. Realized gains and losses on securities, including declines in value judged to be other than temporary, are reported net as a component of noninterest income. The cost of securities sold is specifically identified for use in calculating realized gains and losses.  Loans  Loans held for investment  Loans that the Company has the intent and ability to hold for the foreseeable future or until maturity or payoff are considered loans held for investment and reported as “Loans” in the Consolidated Balance Sheets and in the related footnote disclosures. Loans held for investment include loans originated for investment and loans acquired in purchase transactions.  Originated loans are reported at the principal balance outstanding net of unearned income. Interest on loans and accretion of unearned income, including net deferred loan fees and costs, are computed in a manner that approximates a level yield on recorded principal. Interest on loans is recognized in income as earned.  The accrual of interest on an originated loan is discontinued (“nonaccrual status”) when, in management’s opinion, it is probable that the borrower will be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. When accrual of interest is discontinued on a loan, all unpaid accrued interest is reversed and payments subsequently received are applied first to recover principal. Interest income is recognized for payments received after contractual principal has been satisfied. Loans are returned to accrual status when all the principal and interest contractually due are brought current and future payment performance is reasonably assured.  Loans that are acquired in purchase transactions are recorded at estimated fair value at the acquisition date with no carryover of the related allowance for loan losses. Acquired loans are segregated between those considered to be performing (“purchased credit performing”) and those with evidence of credit deterioration (“purchased credit impaired”) based on such factors as past due status, nonaccrual status and credit risk ratings (rated substandard or worse). Purchased credit performing loans are accounted for under Accounting Standards Codification (ASC) 310-20 and purchased credit impaired loans are accounted for under ASC 310-30. Purchased credit impaired loans for which the timing and amount of future cash flows cannot be reasonably projected are accounted for using the cost recovery method.  With the exception of those accounted for using the cost recovery method, the acquired loans are further segregated into loan pools designed to facilitate the development of expected cash flows to be used in estimating fair value. The pools are based on common risk characteristics such as market area, loan type, credit risk ratings, contractual interest rate, and repayment terms. Loan types can include commercial and industrial loans not secured by real estate, construction and land development loans, commercial real estate loans, residential mortgage loans, and consumer loans, with further segregation within certain loan types as needed. Expected cash flows, both principal and interest, from each pool are estimated based on key assumptions covering such factors as prepayments, default rates, and severity of loss given a default. These assumptions are developed using both historical experience and the portfolio characteristics at acquisition as well as available market research. The fair value estimate for each pool is based on the estimate of expected cash flows from the pool discounted at prevailing market rates.  The difference at the acquisition date between the fair value and the contractual amounts due for each purchased credit performing loan pool (the “fair value discount”) is accreted into income over the estimated life of the pool. Purchased credit performing loans are placed on nonaccrual status and reported as nonperforming or past due using the same criteria applied to the originated portfolio.  The excess of estimated cash flows expected to be collected from each purchased credit impaired loan pool over the pool’s carrying value is referred to as the accretable yield and is recognized in interest income using an effective yield method over the expected life of the pool. Each pool of purchased credit impaired loans is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Purchased credit impaired loans in pools with an accretable yield and expected cash flows that are reasonably estimable are considered to be accruing and performing even though collection of contractual payments on loans within the pool may be in doubt. Purchased credit impaired loans accounted for in pools are generally not subject to individual evaluation for impairment and are not reported with impaired loans or troubled debt restructurings even if they would otherwise qualify for such treatment.  Loans Held for Sale  Residential mortgage loans originated for sale are classified as loans held for sale and carried at the lower of cost or market. Forward sales commitments on a best-efforts basis are entered into with third parties concurrently with rate lock commitments made to prospective borrowers. At times, management may decide to sell loans that were not originated for that purpose. Those loans are reclassified as held for sale when that decision is made and also carried at the lower of cost or market.  Impaired Loans  The Company considers a loan to be impaired when, based upon current information and events, it believes it is probable all amounts due according to the contractual terms of the loans agreement will not be collected. A loan is not considered impaired due to a delay in payment if all amounts due, including interest accrued at the contractual interest rate of the period of delay, is expected to be collected. Impaired loans include loans on nonaccrual, certain purchased credit impaired loans accounted for using the cost recovery method, and loans modified in troubled debt restructurings (defined below), both accruing and nonaccrual statuses. Purchased credit impaired loans accounted for in pools with an accretable yield are considered performing and excluded from impaired loans as this accounting methodology takes into consideration expected future credit losses.  Troubled Debt Restructurings  Troubled debt restructurings (TDRs) occur when a borrower is experiencing, or is expected to experience, financial difficulties in the near-term and a modification in loan terms is granted that would otherwise not have been considered.  Troubled debt restructurings can result in loans remaining on nonaccrual, moving to nonaccrual, or continuing to accrue, depending on the individual facts and circumstances of the borrower. All loans whose terms have been modified in a TDR, including both commercial and retail loans, are reported as “impaired.” When measuring impairment on a TDR, the loan’s value is determined by either the present value of expected cash flows calculated using the loan’s effective interest rate before the restructuring, or the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. If the value as determined is less than the recorded investment in the loan, the difference is charged off through the allowance for loan and lease losses. Modified acquired-impaired loans are not removed from their accounting pool and accounted for as a TDR even if those loans would otherwise be deemed TDRs.  Allowance for Loan and Lease Losses  The Allowance for Loan and Lease Losses (ALLL) is a valuation account available to absorb losses on loans. The ALLL is established and maintained at an amount sufficient to cover estimated credit losses inherent in the loan and lease portfolios of the Company as of the date of the determination. Credit losses arise not only from credit risk, but also from other risks inherent in the lending process including, but not limited to, collateral risk, operational risk, concentration risk, and economic risk. As such, all related risks of lending are considered when assessing the adequacy of the allowance for loan and lease losses. Quarterly, management estimates inherent losses in the portfolio based on a number of factors, including the Company’s past loan loss and delinquency experience, known and inherent risks in the portfolio, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.  The analysis and methodology for estimating the ALLL include two primary elements: A loss rate analysis, which incorporates a historical loss rate as updated for current conditions, is used for loans collectively evaluated for impairment; and a specific reserve analysis is used for loans individually evaluated for impairment. For the loss rate analysis, the Company segments loans into commercial non-real estate, commercial real estate – owner occupied, commercial real estate – income producing, construction and land development, residential mortgage and consumer, with further segmentation as deemed appropriate. Both quantitative and qualitative factors are applied at the detailed portfolio segments. Commercial loans (commercial non-real estate, commercial real estate – owner occupied, commercial real estate – income producing and construction and land development), are further subdivided by risk rating, while retail loans (residential mortgage and consumer) are further subdivided by delinquency. The Company uses loss emergence periods developed based on historical experience, which is currently 24 months for commercial loans and twelve to eighteen months for retail and residential mortgage loans. Historical loss rates are calculated using a weighted average of the loss emergence periods in the historical look back period. As circumstances dictate, management will make adjustments to the overall loss rate to reflect differences in current conditions as compared to those during the historical loss period. Conditions to be considered include problem loan trends, current business and economic conditions, credit concentrations, lending policies and procedures, lending staff, collateral values, loan profiles and volumes, loan review quality, and changes in competition and regulations.  When a loan is determined to be impaired, the amount of impairment is recognized by creating a specific allowance for any shortfall between the loan’s value and its recorded investment. The loan’s value is measured by either the loan’s observable market price, the fair value of the collateral of the loan (less liquidation costs) if it is collateral dependent, or by the present value of expected future cash flows discounted at the loan’s effective interest rate. Loans individually analyzed for impairment are not incorporated into the pool analysis to avoid double counting. The Company limits the specific reserve analysis to include all impaired commercial and residential mortgage loans with relationship balances of $1 million or greater and all loans classified as troubled debt restructurings.  The monitoring of credit risk also extends to unfunded credit commitments, such as unused commercial credit lines and letters of credit, and management establishes reserves as needed for its estimate of probable losses on such commitments.  It is the policy of the Company to promptly charge off all commercial and residential mortgage loans, or portions of loans, when available information reasonably confirms that they are wholly or partially uncollectible. Prior to recognizing a loss, asset value is established based on an assessment of the value of the collateral securing the loan, the borrower’s and the guarantor’s ability and willingness to pay and the status of the account in bankruptcy court, if applicable. Consumer loans are generally charged down when the loan is 90 days past due for unsecured loans or 120 days past due for secured loans, unless the loan is clearly both well secured and in the process of collection. Loans are charged down to the fair value of the collateral, if any, less estimated selling costs. Loans are charged off against the allowance for loan losses with subsequent recoveries added back to the allowance.  Allowance for purchased credit performing loans is evaluated at each reporting date subsequent to acquisition. An allowance is determined for each loan pool using a methodology similar to that described above for originated loans and then compared to the remaining fair value discount for that pool. If the allowance is greater than the discount, the excess is recognized as an addition to the allowance through a provision for loan losses. If the allowance is less than the discount, no additional allowance is recognized.  For purchased credit impaired loans accounted for in pools, estimated cash flows expected to be collected are recast at each reporting date for each loan pool that is material individually or in the aggregate. These evaluations require the continued use and updating of key assumptions and estimates such as default rates, loss severity given default and prepayment speed assumptions, similar to those used for the initial fair value estimate. Management’s judgment must be applied in developing these assumptions. If the present value of expected cash flows for a pool is less than its carrying value, impairment is recognized by an increase in the allowance for loan losses and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established allowance for loan losses is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool.  Property and Equipment  Property and equipment are recorded at cost, less accumulated depreciation and amortization. Depreciation is charged to expense using the straight-line method over the estimated useful lives of the assets, which are up to 3 0 years for buildings and three to ten years for most furniture and equipment. Amortization expense for software is generally charged over three years, or seven years for core systems. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. The Company evaluates whether events and circumstances have occurred that indicate that such long-lived assets have been impaired. Measurement of any impairment of such long-lived assets is based on their fair values.  Property and equipment used in operations is considered held for sale when certain criteria are met, including when management has committed to a plan to sell the asset, the asset is available for sale in its immediate condition, and the sale is probable within one year of the reporting date. Assets held for sale are reported at the lower of cost or fair value less costs to sell. Gains and losses related to retirement or disposition of property and equipment are recorded in other income under noninterest income on the consolidated statements of income as realized.  Other Real Estate and Foreclosed Assets  Other real estate and foreclosed assets includes real property and other assets that have been acquired in satisfaction of loans, and real property no longer used in the Bank’s business. These assets are recorded at the estimated fair value less the estimated cost of disposition and carried at the lower of either cost or market. Fair value is based on independent appraisals and other relevant factors. Any initial reduction in the carrying amount of a loan to the fair value of the collateral received less selling costs is charged to the allowance for loan losses. Each asset is revalued on an annual basis, or more often if market conditions necessitate. Subsequent losses on the periodic revaluation of these assets and gains or losses recognized on disposition are charged to current earnings, as are revenues from and costs of operating and maintaining real property. Improvements made to real property are capitalized if the expenditures are expected to be recovered upon the sale of the property.  Goodwill and Other Intangible Assets  Goodwill represents the excess of consideration paid over the fair value of net assets acquired or the excess of the fair value liabilities assumed over consideration received in a business combination. Goodwill is not amortized but is assessed for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment. The impairment test compares the estimated fair value of a reporting unit with its net book value. The Company has assigned all goodwill to one reporting unit that represents overall banking operations. The fair value of the reporting unit is based on valuation techniques that market participants would use in an acquisition of the whole unit, such as estimated discounted cash flows, the quoted market price of the Company’s stock, adjusted for a control premium, and observable average price-to-earnings and price-to-book multiples of competitors. If the unit’s fair value is less than its carrying value, an estimate of the implied fair value of the goodwill is compared to the goodwill’s carrying value, and any impairment recognized.  Other identifiable intangible assets with finite lives, such as core deposit intangibles, customer lists and trade name, are initially recorded at fair value and are generally amortized over the periods benefited. These assets are evaluated for impairment in a similar manner to long-lived assets.  Life Insurance Contracts  Bank-owned life insurance contracts (BOLI) are comprised of long-term life insurance contracts on the lives of certain current and past employees where the insurance policy benefits and ownership are retained by the employer. Its cash surrender value is an asset that the Company uses to partially offset the future cost of employee benefits. The cash value accumulation on BOLI is permanently tax deferred if the policy is held to the insured person’s death and certain other conditions are met.  Derivative Instruments and Hedging Activities  The Company records all derivatives on the balance sheet at fair value as components of other assets and other liabilities. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge.  For derivatives designated as hedging the exposure to changes in the fair value of an asset or liability (fair value hedge), the gain or loss is recognized in earnings in the period of the fair value change together with the offsetting loss or gain on the hedged item attributable to the risk being hedged. Prior to the adoption of Accounting Standards Update (“ASU”) 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” on January 1, 2018, the effective portion of a derivative’s gain or loss for derivatives designated as hedging exposure to variable cash flows of a forecasted transaction (cash flow hedge), was initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings or in certain circumstances, when the hedge is terminated. The ineffective portion of the gain or loss was reported in earnings immediately. The provisions of ASU 2017-12 eliminated the concept of ineffectiveness for instruments that qualify for hedge accounting treatment; thus, the full impact of hedge gains and losses will be recognized in the period in which the hedged transaction impacts the entity’s earnings. For derivatives that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.  Note 10 - Derivatives describes the derivative instruments currently used by the Company and discloses how these derivatives impact the Company’s financial position and results of operations.  Stockholders’ Equity  Common stock reflects shares issued at par value. Repurchase of the Company’s common stock (treasury stock) is recorded at cost as a reduction of stockholders’ equity within capital surplus in the accompanying Consolidated Balance Sheets and the Statements of Changes in Stockholders’ Equity. When treasury shares are subsequently reissued, treasury stock is reduced by the cost of such stock using the first-in-first-out method, with the difference recorded in capital surplus or retained earnings, as applicable.  Revenue Recognition  Interest Income Interest income is recognized on an accrual basis driven by written contracts, such as loan agreements or securities contracts. Loan origination fees are recognized over the life of the loan as an adjustment to yield.  Service Charges on Deposit Accounts Service charges on deposit accounts include transaction based fees for non-sufficient funds , account analysis fees, and other service charges on deposits, including monthly account service fees. Non-sufficient funds fees are recognized at the time when the account overdraft occurs in accordance with regulatory guidelines. Account analysis fees consist of fees charged on certain business deposit accounts based upon account activity as well as other monthly account fees, and are recorded under the accrual method of accounting as services are performed.  Other service charges are earned by providing depositors safeguard and remittance of funds as well as by providing other elective services for depositors that are performed upon the depositor’s request. Charges for deposit services for the safeguard and remittance of funds are recognized at the end of the statement cycle, after services are provided, as the customer retains funds in the account. Revenue for other elective services is earned at the point in time the customer uses the service.  Trust Fees Trust fee income represents revenue generated from asset management services provided to individuals, businesses, and institutions. The Company has a fiduciary responsibility to the beneficiary of the trust to perform agreed upon services which can include investing assets, periodic reporting, and providing tax information regarding the trust. In exchange for these trust and custodial services, the Company collects fee income from beneficiaries as contractually determined via fee schedules. The Company’s performance obligation is primarily satisfied over time as the services are performed and provided to the customer. These fees are recorded under the accrual method of accounting as the services are performed. The Company generally acts as the principal in these transactions and records revenue and expenses on a gross basis.  Bank Card and Automated Teller Machine (“ATM”) Fees Bank card and ATM fees include credit card, debit card and ATM transaction revenue. The majority of this revenue is card interchange fees earned through a third party network. Performance obligations are satisfied for each transaction when the card is used and the funds are remitted. The network establishes interchange fees that the merchant remits for each transaction, and costs are incurred from the network for facilitating the interchange with the merchant. Card fees also include merchant services fees earned for providing merchants with card processing capabilities.  ATM income is generated from allowing customers to withdraw funds from other banks’ machines and from allowing a non-customer cardholder to withdraw funds from the Company’s machines. The Company satisfies its performance obligations for each transaction at the point in time that the withdrawal is processed.  Bank card and ATM fee income is recorded on accrual basis as services are provided with the related expense reflected in data processing expense.  Investment and Annuity Fees and Insurance Commissions Investment and annuity services fee income represents income earned from investment and advisory services. The Company provides its customers with access to investment products through the use of third party carriers to meet their financial needs and investment objectives. Upon selection of an investment product, the customer enters into a policy with the carrier. The performance obligation is satisfied by fulfilling its responsibility to acquire the investment for which a commission fee is earned from the carrier based on agreed-upon fee percentages on a trade date basis. The Company has a contractual relationship with a third party broker dealer to provide full service brokerage and investment advisory activ

Acquisitions and Divestiture

Acquisitions and Divestiture	12 Months Ended
	Dec. 31, 2018
Acquisitions [Abstract]
Acquisitions and Divestiture	Note 2. Acquisitions and Divestiture  Acquisitions  On July 13, 2018, the Company acquired the bank-managed high net worth individual and institutional investment management and trust business of Capital One, National Association (“Capital One”). The transaction added assets under management of $4 billion and assets under management and administration of $10.4 billion to the Company’s existing trust and asset management business. In addition, the Company assumed approximately $217 million of customer deposit liabilities. The net consideration received is subject to final settlement, which is expected to occur during the first quarter of 2019. The transaction was accounted for as a business combination. The following table sets forth the preliminary acquisition date fair value of the assets acquired and the liabilities assumed, the consideration received, and the resulting goodwill as of December 31, 2018 .     (in thousands)  ASSETS  Accounts receivable $ 2,803  Identifiable intangible assets 27,562  Total identifiable assets 30,365   LIABILITIES  Deposit liabilities 217,432  Other liabilities 151  Total liabilities 217,583  Net liabilities assumed (187,218)  Consideration received 141,769  Goodwill $ 45,449  Identifiable intangible assets include customer relationships that are being amortized using an accelerated method based on forecasted cash flows over a useful life of approximately 17 years. Goodwill represents the excess of the fair value of net liabilities assumed over the consideration received. It is comprised of estimated future economic benefits arising from the transaction that cannot be individually identified or do not qualify for separate recognition. These benefits include expanded presence in existing markets and entry into new markets, and expected earnings streams and operational efficiencies that the Company believes will result from this business combination. The tax basis of the goodwill is expected to be deductible for federal income tax purposes.  On March 10, 2017, the Company acquired certain assets and assumed certain liabilities, including nine branches, from First NBC Bank (“FNBC”), referred to as the FNBC I transaction. The Company paid approximately $323 million in cash consideration ( $326 million cash paid net of $3 million in branch cash acquired), including a $41.6 million transaction premium for the earnings stream acquired.  On April 28, 2017, the Louisiana Office of Financial Institutions (“OFI”) closed FNBC and appointed the FDIC as receiver. The Company entered into a purchase and assumption agreement with the FDIC, referred to as the FNBC II transaction. Pursuant to the agreement, the Company acquired selected assets and assumed select liabilities of the former FNBC, including substantially all of the transaction and savings deposits. The Company paid a premium of $35 million to the FDIC for the earnings stream acquired and received approximately $ 800 million in cash ( $64 2 million from the FDIC for the net liabilities assumed and $158 million in branch cash acquired).  The FNBC transactions were accounted for as business combinations. The following table sets forth the acquisition date fair value of the assets acquired and the liabilities assumed, the consideration paid or received, and the resulting goodwill in each of the FNBC transactions, and in the aggregate.      FNBC I FNBC II  (in thousands) March 10, 2017 April 28, 2017 Total  ASSETS  Cash and due from banks $ 2,856 $ 157,932 $ 160,788  Interest-bearing time deposits with other banks — 382,622 382,622  Fed funds sold and other short-term investments — 148 148  Securities — 213,877 213,877  Total loans 1,203,092 165,577 1,368,669  Property and equipment 11,946 8,988 20,934  Accrued interest receivable 3,143 885 4,028  Identifiable intangible assets 3,900 21,400 25,300  Deferred tax asset 856 1,364 2,220  Other assets 63 4,150 4,213  Total identifiable assets 1,225,856 956,943 2,182,799   LIABILITIES  Deposits 398,171 1,530,338 1,928,509  Short-term borrowings 510,749 85,886 596,635  Long-term debt 93,120 — 93,120  Other liabilities 1,607 3,079 4,686  Total liabilities 1,003,647 1,619,303 2,622,950  Net identifiable assets acquired (liabilities assumed) 222,209 (662,360) (440,151)  Consideration (Paid) Received (325,756) 641,577 315,821  Goodwill $ 103,547 $ 20,783 $ 124,330    The loans acquired were recorded at estimated fair value at the acquisition dates with no carryover of the related allowance for loan losses. Substantially all of the loans acquired were considered to be performing (“purchased credit performing”) based on such factors as past due status and nonaccrual status, and were accounted for under Accounting Standards Codification (“ASC”) 310-20. The unpaid principal balance of the performing loans acquired totaled $1. 4 billion , of which $ 31.7 million is not expected to be collected. The difference at the acquisition dates between the fair value and the contractual amounts due (the “fair value discount”) of $ 41.0 million will be accreted into income over the estimated lives of the loan pools established in the valuation. Loans with an unpaid principal balance of $39.9 million and a fair value of $ 15.0 million were considered to be purchased credit impaired and were accounted for under ASC 310-30 using the cost recovery method; as such, the related fair value discount of $ 24.9 million will not be accreted into income.  The Company assumed approximately $6 90 million of borrowings in the transactions, consisting of short-term and long-term Federal Home Loan Bank (“FHLB”) borrowings and securities sold under repurchase agreements. The short-term FHLB borrowings consisted of $460 million in variable rate term notes and $51 million in fixed rate term notes. The long-term FHLB borrowings included $93.1 million in fixed rate term notes. Identifiable intangible assets consist of core deposit intangibles totaling $ 2 5.3 million that are being amortized using sum of years’ digits over the asset’s life of eight years for the FNBC I transaction and eleven years for the FNBC II transaction. Goodwill totaling $ 124.3 million represents the excess of the consideration paid over the fair value of the net assets acquired, or the excess of the fair value of the net liabilities assumed over the consideration received. It is comprised of estimated future economic benefits arising from these transactions that cannot be individually identified or do not qualify for separate recognition. These benefits include increased market share in the Greater New Orleans and Florida Panhandle market areas, expected earnings streams, and operational efficiencies that the Company believes will result from these business combinations. The tax basis of the goodwill generated from these transactions is deductible for federal income tax purposes.  The following table illustrates the change in the Company’s goodwill for the years ended December 31, 2018 and 2017:      (in thousands)  Goodwill balance at December 31, 2016 $ 621,193  Additions and adjustments:  Initial goodwill recorded in FNBC I transaction 95,568  Measurement period adjustments - FNBC I transaction 7,979  Initial goodwill recorded in FNBC II transaction 23,009  Measurement period adjustments - FNBC II transaction (2,226)  Goodwill balance at December 31, 2017 $ 745,523  Additions and adjustments:  Initial goodwill recorded in acquisition of trust and asset management business 45,634  Measurement period adjustments - acquisition of trust and asset management business (185)  Goodwill balance at December 31, 2018 $ 790,972  The operating results of the Company for the year s ended December 31, 2018 and 2017 include the results from the operations acquired in the trust and asset management and the FNBC transactions since the respective acquisition dates. The acquired trust and asset management business added approximately $10.5 million of trust fee revenue and $7.3 million of related expense to the Company’s result of operations for the year ended December 31, 2018. Supplemental pro forma financial information of the combined entity for the years ended December 31, 2018 and 2017 is not presented as the results of acquired business are not material to the Company’s results of operations. In the cases of the FNBC transactions, e stimating reliable historical financial information is impracticable as only selected components of the businesses, as historically operated, were acquired. A number of post-acquisition events following the FNBC transactions, including the consolidation of certain branch locations and the integration of operations, cash and investments acquired make quantifying discrete earnings contributions of the businesses acquired impracticable. As such, neither supplemental pro forma financial information of the combined entity, nor revenue and earnings contributed by the businesses acquired since the dates of acquisition are presented.  The Company incurred merger-related costs in connection with the trust and asset management acquisition during the year ended December 31, 2018 and the FNBC transactions during the year ended December 31, 2017. The following table sets forth the merger-related costs incurred during the respective years:      Years Ended December 31,  (in thousands) 2018 2017  Personnel expense $ 1,257 $ 3,662  Net occupancy and equipment expense 309 777  Professional services expense 2,827 9,681  Data processing expense 1,583 974  Other real estate - (1,511)  Advertising expense 52 1,389  Other expense 159 4,398  Total merger-related expenses $ 6,187 $ 19,370  Divestiture  On March 9, 2018, the Company sold its consumer finance subsidiary, Harrison Finance Company (“HFC”). The Company received cash of approximately $78.9 million and recorded a loss on the sale of $1.1 million.  

Securities

Securities	12 Months Ended
	Dec. 31, 2018
Securities [Abstract]
Securities	Note 3. Securities  The amortized cost and fair value of securities classified as available for sale and held to maturity at December 31, 2018 and 2017 follow.      Securities Available for Sale  December 31, 2018 December 31, 2017  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 74,339 $ — $ 2,633 $ 71,706 $ 99,535 $ — $ 2,263 $ 97,272  Municipal obligations 246,713 360 6,646 240,427 245,997 1,135 3,346 243,786  Residential mortgage-backed securities 1,468,912 4,284 29,794 1,443,402 1,729,989 5,611 20,387 1,715,213  Commercial mortgage-backed securities 799,060 1,953 30,936 770,077 704,518 480 17,863 687,135  Collateralized mortgage obligations 163,282 903 2,260 161,925 165,518 4 1,559 163,963  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,755,806 $ 7,500 $ 72,269 $ 2,691,037 $ 2,949,057 $ 7,230 $ 45,418 $ 2,910,869      Securities Held to Maturity  December 31, 2018 December 31, 2017  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 50,000 $ — $ 478 $ 49,522 $ 50,000 $ — $ 289 $ 49,711  Municipal obligations 688,201 2,347 9,503 681,045 723,094 8,323 4,245 727,172  Residential mortgage-backed securities 640,393 1,461 6,117 635,737 725,748 4,175 2,690 727,233  Commercial mortgage-backed securities 357,175 376 10,882 346,669 317,185 40 3,915 313,310  Collateralized mortgage obligations 1,243,778 1,598 22,493 1,222,883 1,161,484 572 17,472 1,144,584  $ 2,979,547 $ 5,782 $ 49,473 $ 2,935,856 $ 2,977,511 $ 13,110 $ 28,611 $ 2,962,010  The following tables present the amortized cost and fair value of debt securities at December 31, 2018 by contractual maturity. Actual maturities will differ from contractual maturities because of rights to call or repay obligations with or without penalties and scheduled and unscheduled principal payments on mortgage-backed securities and collateral mortgage obligations.      (in thousands) Amortized Cost Fair Value  Debt Securities Available for Sale  Due in one year or less $ 1,862 $ 1,868  Due after one year through five years 105,364 106,255  Due after five years through ten years 1,200,188 1,163,870  Due after ten years 1,448,392 1,419,044  Total available for sale debt securities $ 2,755,806 $ 2,691,037      (in thousands) Amortized Cost Fair Value  Debt Securities Held to Maturity  Due in one year or less $ 18,654 $ 18,676  Due after one year through five years 127,861 126,495  Due after five years through ten years 1,425,846 1,405,836  Due after ten years 1,407,186 1,384,849  Total held to maturity debt securities $ 2,979,547 $ 2,935,856  The Company held no securities classified as trading at December 31, 2018 or 2017 .  The details for securities classified as available for sale with unrealized losses as of December 31, 2018 follow.      Available for sale  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 71,706 $ 2,633 $ 71,706 $ 2,633  Municipal obligations 41,203 591 170,883 6,054 212,086 6,645  Residential mortgage-backed securities 305,090 2,485 762,826 27,309 1,067,916 29,794  Commercial mortgage-backed securities 96,226 1,851 570,485 29,085 666,711 30,936  Collateralized mortgage obligations 254 1 111,804 2,259 112,058 2,260  $ 442,773 $ 4,928 $ 1,687,704 $ 67,340 $ 2,130,477 $ 72,268  The details for securities classified as available for sale with unrealized losses as of December 31, 2017 follow.      Available for sale  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ 45,616 $ 42 $ 51,157 $ 2,221 $ 96,773 $ 2,263  Municipal obligations 2,768 11 173,530 3,335 176,298 3,346  Residential mortgage-backed securities 461,835 4,195 898,099 16,192 1,359,934 20,387  Commercial mortgage-backed securities 203,618 995 411,046 16,868 614,664 17,863  Collateralized mortgage obligations 128,174 1,076 35,488 483 163,662 1,559  $ 842,011 $ 6,319 $ 1,569,320 $ 39,099 $ 2,411,331 $ 45,418  The details for securities classified as held to maturity with unrealized losses as of December 31, 2018 follow.      Held to maturity  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 49,521 $ 478 $ 49,521 $ 478  Municipal obligations 233,469 2,256 233,280 7,247 466,749 9,503  Residential mortgage-backed securities 90,730 123 235,251 5,994 325,981 6,117  Commercial mortgage-backed securities — — 305,419 10,882 305,419 10,882  Collateralized mortgage obligations 77,394 281 897,153 22,212 974,547 22,493  $ 401,593 $ 2,660 $ 1,720,624 $ 46,813 $ 2,122,217 $ 49,473  The details for securities classified as held to maturity with unrealized losses as of December 31, 201 7 follow.      Held to maturity  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  ( in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 49,711 $ 289 $ 49,711 $ 289  Municipal obligations 14,603 19 230,960 4,226 245,563 4,245  Residential mortgage-backed securities 8,815 99 230,277 2,591 239,092 2,690  Commercial mortgage-backed securities 174,882 744 72,499 3,171 247,381 3,915  Collateralized mortgage obligations 570,289 5,653 472,536 11,819 1,042,825 17,472  $ 768,589 $ 6,515 $ 1,055,983 $ 22,096 $ 1,824,572 $ 28,611  The unrealized losses primarily relate to changes in market rates on fixed rate debt securities since the respective purchase date. In all cases, the indicated impairment on these debt securities would be recovered no later than the security’s maturity date or possibly earlier if the market price for the security increases with a reduction in the yield required by the market. None of the unrealized losses relate to the marketability of the securities or the issuers’ abilities to meet contractual obligations. The Company believes it has adequate liquidity and, therefore, does not plan to and, more likely than not, will not be required to sell these securities before recovery of the indicated impairment. Accordingly, the unrealized losses on these securities have been determined to be temporary.  The following table presents the proceeds from and gross gains and gross losses on sales of securities during the years ended December 31, 2018, 2017 and 2016:      Years Ended December 31,  (in thousands) 2018 2017 2016  Proceeds $ 455,162 $ 213,877 $ 173,215  Gross gains — — 1,965  Gross losses 25,480 — 211   Securities with carrying values totaling approximately $3.4 billion at December 31, 2018 and $3.3 billion at December 31, 201 7 were pledged, primarily to secure public deposits or securities sold under agreements to repur chase.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
Loans and Allowance for Loan Losses [Abstract]
Loans and Allowance for Loan Losses	Note 4. Loans and Allowance for Loan Losses The Company generally makes loans in its market areas of south Mississippi, southern and central Alabama, south Louisiana, the Houston, Texas area, the northern, central and panhandle regions of Florida, and Nashville, Tennessee. Loans, net of unearned income, consisted of the follo wing at December 31, 2018 and 2017:       (in thousands) 2018 2017  Commercial non-real estate $ 8,620,601 $ 8,297,937  Commercial real estate - owner occupied 2,457,748 2,142,439  Total commercial and industrial 11,078,349 10,440,376  Commercial real estate - income producing 2,341,779 2,384,599  Construction and land development 1,548,335 1,373,421  Residential mortgages 2,910,081 2,690,472  Consumer 2,147,867 2,115,295  Total loans $ 20,026,411 $ 19,004,163  The Bank makes loans in the normal course of business to directors and executive officers of the Company and the Bank and to their associates. L oans to such related parties are made on substantially the same terms, including interest rates and collateral requirements, as those prevailing at the time for comparable transactions with unrelated parties and do not involve more than normal risk of collectability when originated. Balances of loans to the Company’s directors, executive officers and their associates at December 31, 201 8 and 201 7 were approximately $ 37.5 million and $33 .6 million, respectiv ely. Related party loan activity for 2018 includes new loans of $16 .3 million and repayments of $12.3 million.  The Bank has a line of credit with the Federal Home Loan Bank of Dallas that is secured by blanket pledges of certain qualifying loan types. The Bank had borrowings on this line of $1.2 b illion and $1.1 b illion at December 31, 2018 and 2017 , respectively.  The following schedules show activity in the allowance for loan losses for the years ended December 31, 201 8 and 201 7 by portfolio segment , and the corresponding recorded investment in loans as of December 31, 201 8 and 201 7 .      Commercial Non-Real Estate Commercial Real Estate- Owner Occupied Total Commercial and Industrial Commercial Real Estate- Income Producing Construction and Land Development Residential Mortgages Consumer Total  (in thousands) Year Ended December 31, 2018  Allowance for loan losses:  Beginning balance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Charge-offs (40,069) (8,059) (48,128) (1,633) (334) (614) (23,913) (74,622)  Recoveries 14,385 317 14,702 221 96 2,179 5,162 22,360  Net provision for loan losses (4,482) 8,537 4,055 5,341 8,513 (2,627) 20,834 36,116  Other — — — — — — (6,648) (6,648)  Ending balance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514  Ending balance:  Allowance:  Individually evaluated for impairment $ 3,636 $ 607 $ 4,243 $ 210 $ 1 $ 444 $ 216 $ 5,114  Amounts related to purchased credit impaired loans 239 215 454 43 83 9,766 388 10,734  Collectively evaluated for impairment 93,877 12,935 106,812 17,385 15,563 13,572 25,334 178,666  Total allowance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514  Loans:  Individually evaluated for impairment $ 239,384 $ 21,666 $ 261,050 $ 2,701 $ 121 $ 3,876 $ 1,007 $ 268,755  Purchased credit impaired loans 6,629 6,212 12,841 3,757 3,387 105,430 4,181 129,596  Collectively evaluated for impairment 8,374,588 2,429,870 10,804,458 2,335,321 1,544,827 2,800,775 2,142,679 19,628,060  Total loans $ 8,620,601 $ 2,457,748 $ 11,078,349 $ 2,341,779 $ 1,548,335 $ 2,910,081 $ 2,147,867 $ 20,026,411      Commercial Non-Real Estate Commercial Real Estate- Owner Occupied Total Commercial and Industrial Commercial Real Estate- Income Producing Construction and Land Development Residential Mortgages Consumer Total  (in thousands) Year Ended December 31, 2017  Allowance for loan losses:  Beginning balance $ 147,052 $ 11,083 $ 158,135 $ 13,509 $ 6,271 $ 25,361 $ 26,142 $ 229,418  Charge-offs (51,479) (558) (52,037) (259) (696) (2,839) (31,430) (87,261)  Recoveries 7,526 848 8,374 988 1,603 1,064 6,680 18,709  Net provision for loan losses 24,866 1,589 26,455 (529) 194 3,602 29,246 58,968  Increase (decrease) in FDIC loss share receivable (47) — (47) — — (2,344) (135) (2,526)  Ending balance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Ending balance:  Allowance:  Individually evaluated for impairment $ 16,129 $ 793 $ 16,922 $ 1,326 $ 11 $ 189 $ 118 $ 18,566  Amounts related to purchased credit impaired loans 525 465 990 41 172 12,258 646 14,107  Collectively evaluated for impairment 111,264 11,704 122,968 12,342 7,189 12,397 29,739 184,635  Total allowance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Loans:  Individually evaluated for impairment $ 267,881 $ 21,491 $ 289,372 $ 15,530 $ 363 $ 10,640 $ 1,292 $ 317,197  Purchased credit impaired loans 5,941 7,294 13,235 2,742 5,829 119,553 6,178 147,537  Collectively evaluated for impairment 8,024,115 2,113,654 10,137,769 2,366,327 1,367,229 2,560,279 2,107,825 18,539,429  Total loans $ 8,297,937 $ 2,142,439 $ 10,440,376 $ 2,384,599 $ 1,373,421 $ 2,690,472 $ 2,115,295 $ 19,004,163  Impaired Loans  The following table shows the composition of nonaccrual loans by portfolio class. Purchased credit impaired loans accounted for in pools with an accretable yield are considered to be performing and are excluded from the table.      December 31,  (in thousands) 2018 2017  Commercial non-real estate $ 110,653 $ 152,863  Commercial real estate - owner occupied 16,895 25,989  Total commercial and industrial 127,548 178,852  Commercial real estate - income producing 4,991 14,574  Construction and land development 2,146 3,807  Residential mortgages 35,866 40,480  Consumer 16,744 15,087  Total loans $ 187,295 $ 252,800  Nonacc rual loans include loans modified in troubled debt restructurings (TDRs) of $85.5 million and $99 .2 million, respectively, at December 31, 2018 and 2017 . Total TDRs, both accruing and nonaccruing, were $224.6 million at December 31, 201 8 and $ 219.7 million at December 31, 201 7 .  The table below details the T DRs that were modified during the years ended December 31, 201 8, 201 7 and 2016 by portfolio segment. All such loans are individually evaluated for impairment.         Years Ended December 31,  ($ in thousands) 2018 2017 2016  Outstanding Recorded Investment Outstanding Recorded Investment Outstanding Recorded Investment  Troubled Debt Restructurings: Number of Contracts Pre- Modification Post- Modification Number of Contracts Pre- Modification Post- Modification Number of Contracts Pre- Modification Post- Modification  Commercial non-real estate 29 $ 85,306 $ 85,306 52 $ 162,909 $ 162,909 38 $ 128,449 $ 128,449  Commercial real estate - owner occupied 2 6,138 6,138 5 5,684 5,684 1 148 148  Total commercial and industrial 31 91,444 91,444 57 168,593 168,593 39 128,597 128,597  Commercial real estate - income producing 1 1,564 1,564 5 5,625 5,625 1 2,943 2,943  Construction and land development — — — — — — — — —  Residential mortgages 14 1,297 1,297 15 2,812 2,812 7 694 694  Consumer 10 455 455 1 40 40 — — —  Total loans 56 $ 94,760 $ 94,760 78 $ 177,070 $ 177,070 47 $ 132,234 $ 132,234  The TDRs modified during the year ended December 31, 201 8 reflected in the table above include $50.8 million of loans with extended amortization terms or other payment concessions, $14.6 million of loans with significant covenant waivers and $29.4 million with other modifications. The TDRs modified during the year ended December 31, 2017 include $98.1 million of loans with extended terms or other payment concessions of $76.2 mllion of loans with significant convenant waivers, and $2.8 million with other modifications. The TDRs modified during the year ended December 31, 201 6 include $108.9 million of loans with extended terms or other payment concessions of $22.8 million of loans with significant covenant waivers, and $0.5 million of other modifications. At December 31, 2018 and 2017, the Company had unfunded commitments of approximately $2.1 million and $7.3 million, respectively, to borrowers whose loan terms had been modified in TDRs.  One residential mortgage totaling $0.2 million, one owner-occupied commercial real estate loan totaling $1.8 million and one consumer loan totaling less than $ 0 .1 million defaulted within 12 months of the modification for December 31, 2018 . No TDRs modified during the year end December 31, 2017 subsequently defaulted within twelve months of modification. Four commercial non-real estate loans modified in TDRs during the year ended December 31, 2016 defaulted within twelve months of modification. The loans were part of a single relationship and had an aggregate carrying balance of $20.8 million at the time of default.  Th e tables below present loans that are individually evaluated for impairment disaggregat ed by class at December 31, 2018 and 2017 . Loans individually evaluated for impairment include TDRs and loans that are determined to be impaired and have aggregate relationship balances of $1 million or more.      December 31, 2018  (in thousands) Recorded Investment Without an Allowance Recorded Investment With an Allowance Unpaid Principal Balance Related Allowance  Commercial non-real estate $ 144,625 $ 94,759 $ 273,290 $ 3,636  Commercial real estate - owner occupied 13,027 8,639 25,888 607  Total commercial and industrial 157,652 103,398 299,178 4,243  Commercial real estate - income producing 1,138 1,563 3,428 210  Construction and land development 100 21 121 1  Residential mortgages 2,058 1,818 4,421 444  Consumer 279 728 1,253 216  Total loans $ 161,227 $ 107,528 $ 308,401 $ 5,114     December 31, 2017  (in thousands) Recorded Investment Without an Allowance Recorded Investment With an Allowance Unpaid Principal Balance Related Allowance  Commercial non-real estate $ 116,682 $ 151,199 $ 285,685 $ 16,129  Commercial real estate - owner occupied 16,927 4,564 24,829 793  Total commercial and industrial 133,609 155,763 310,514 16,922  Commercial real estate - income producing 5,101 10,429 15,687 1,326  Construction and land development 100 263 363 11  Residential mortgages 8,245 2,395 13,855 189  Consumer — 1,292 1,294 118  Total loans $ 147,055 $ 170,142 $ 341,713 $ 18,566   The tables below present the average balances and interest income for total impaired loans for the years ended December 31, 2018 and 2017. Interest income recognized represents interest on accruing loans modified in a TDR.      Years Ended  December 31, 2018 December 31, 2017  (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized  Commercial non-real estate $ 286,146 $ 7,919 $ 255,710 $ 2,774  Commercial real estate - owner occupied 25,325 343 7,901 62  Total commercial and industrial 311,471 8,262 263,611 2,836  Commercial real estate - income producing 9,155 71 14,565 146  Construction and land development 145 - 1,018 2  Residential mortgages 5,598 18 5,784 18  Consumer 814 39 1,558 13  Total loans $ 327,183 $ 8,390 $ 286,536 $ 3,015  Aging Analysis  The following table presents the age analysis of past due loans at December 31, 201 8 and 201 7 . Purchased credit impaired loans with an accretable yield are considered to be current in the following delinquency table:      December 31, 2018 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days past due Total Past Due Current Total Loans Recorded Investment > 90 Days and Accruing  (in thousands)  Commercial non-real estate $ 12,257 $ 3,895 $ 77,551 $ 93,703 $ 8,526,898 $ 8,620,601 $ 10,823  Commercial real estate - owner occupied 2,394 1,570 14,542 18,506 2,439,242 2,457,748 380  Total commercial and industrial 14,651 5,465 92,093 112,209 10,966,140 11,078,349 11,203  Commercial real estate - income producing 2,371 772 5,495 8,638 2,333,141 2,341,779 1,844  Construction and land development 7,397 1,129 2,165 10,691 1,537,644 1,548,335 644  Residential mortgages 32,869 14,706 23,175 70,750 2,839,331 2,910,081 —  Consumer 20,402 4,695 9,665 34,762 2,113,105 2,147,867 618  Total loans $ 77,690 $ 26,767 $ 132,593 $ 237,050 $ 19,789,361 $ 20,026,411 $ 14,309     December 31, 2017 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Total Loans Recorded Investment > 90 Days and Accruing  (in thousands)  Commercial non-real estate $ 62,766 $ 10,761 $ 92,982 $ 166,509 $ 8,131,428 $ 8,297,937 $ 21,989  Commercial real estate - owner occupied 8,493 648 15,517 24,658 2,117,781 2,142,439 2,032  Total commercial and industrial 71,259 11,409 108,499 191,167 10,249,209 10,440,376 24,021  Commercial real estate - income producing 5,315 2,165 6,081 13,561 2,371,038 2,384,599 489  Construction and land development 4,113 1,056 3,412 8,581 1,364,840 1,373,421 477  Residential mortgages 33,621 10,554 30,537 74,712 2,615,760 2,690,472 2,208  Consumer 22,959 7,816 8,553 39,328 2,075,967 2,115,295 571  Total loans $ 137,267 $ 33,000 $ 157,082 $ 327,349 $ 18,676,814 $ 19,004,163 $ 27,766  Credit Quality Indicators  The following table presents the credit quality indicators of the Co mpany’s various classes of loans at December 31, 2018 and December 31, 2017 .      December 31, 2018  (in thousands) Commercial Non-Real Estate Commercial Real Estate - Owner Occupied Total Commercial and Industrial Commercial Real Estate - Income Producing Construction and Land Development Total Commercial  Grade:  Pass $ 7,875,588 $ 2,274,211 $ 10,149,799 $ 2,265,087 $ 1,487,599 $ 13,902,485  Pass-Watch 260,510 84,271 344,781 46,535 49,099 440,415  Special Mention 75,752 23,149 98,901 5,510 816 105,227  Substandard 408,751 76,117 484,868 24,647 10,821 520,336  Doubtful — — — — — —  Total $ 8,620,601 $ 2,457,748 $ 11,078,349 $ 2,341,779 $ 1,548,335 $ 14,968,463      December 31, 2017  (in thousands) Commercial Non-Real Estate Commercial Real Estate - Owner Occupied Total Commercial and Industrial Commercial Real Estate - Income Producing Construction and Land Development Total Commercial  Grade:  Pass $ 7,190,604 $ 1,896,366 $ 9,086,970 $ 2,223,245 $ 1,291,638 $ 12,601,853  Pass-Watch 293,069 82,913 375,982 83,444 60,804 520,230  Special Mention 80,649 27,456 108,105 13,244 4,788 126,137  Substandard 733,558 135,704 869,262 64,658 16,191 950,111  Doubtful 57 — 57 8 — 65  Total $ 8,297,937 $ 2,142,439 $ 10,440,376 $ 2,384,599 $ 1,373,421 $ 14,198,396      December 31, 2018 December 31, 2017  (in thousands) Residential Mortgage Consumer Total Residential Mortgage Consumer Total  Performing $ 2,873,669 $ 2,130,395 $ 5,004,064 $ 2,647,784 $ 2,099,637 $ 4,747,421  Nonperforming 36,412 17,472 53,884 42,688 15,658 58,346  Total $ 2,910,081 $ 2,147,867 $ 5,057,948 $ 2,690,472 $ 2,115,295 $ 4,805,767  Below are the definitions of the Company’s internally assigned grades:  Commercial: · Pass - loans properly approved, documented, collateralized, and performing which do not reflect an abnormal credit risk. · Pass - Watch - credits in this category are of sufficient risk to cause concern. This category is reserved for credits that display negative performance trends. The “Watch” grade should be regarded as a transition category. · Special mention - a criticized asset category defined as having potential weaknesses that deserve management’s close attention. If left uncorrected , these potential weaknesses may, at some future date, result in the deterioration of the repayment prospects for the credit or the institution’s credit position. Special mention credits are not considered part of the Classified credit categories and do not expose an institution to sufficient risk to warrant adverse classification. · Substandard - an asset that is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral ple dged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They ar e characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. · Doubtful - an asset that has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection nor liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. · Loss - credits classified as Loss are considered uncollectable and are charged off promptly once so classified.  Residential and Consumer: · Performing – accruing loans that have not been modified in a troubled debt restructuring . · Nonperforming – loans for which there are good reasons to doubt tha t payments will be made in full. All loans with nonaccrual status and all loans that have been modified in a troubled debt restructuring are classified as nonperforming.  The Company assigns risk ratings at loan origination and reviews these ratings at minimum on annual basis, or at any point management becomes aware of information that may affect a borrower’s ability to service its debt. Credit Review uses a risk-focused continuous monitoring program that provides for an independent, objective and timely review of credit risk within the Company.  Purchased Credit Impaired Loans  Changes in the carrying amount of purchased credit impaired loans not individually evaluated for impairment and accretable yield are presented in the following table for the years ended December 31, 201 8 and 201 7 :      2018 2017  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 153,403 $ 62,517 $ 190,915 $ 113,686  Additions — — 15,000 —  Payments received, net (39,556) (5,779) (69,591) (7,412)  Accretion 15,749 (15,749) 17,079 (17,079)  Increase (decrease) in expected cash flows based on actual  cash flow and changes in cash flow assumptions — (3,695) — (30,379)  Net transfers from nonaccretable difference  to accretable yield — — — 3,701  Balance at end of period $ 129,596 $ 37,294 $ 153,403 $ 62,517  Certain of the Company’s purchased credit impaired loans were covered by a loss share agreement with the FDIC. The agreement was terminated by the Company during the third quarter of 2017. Prior to termination, the Company carried a receivable from the FDIC representing an indemnification asset arising from the agreement. The receivable was accounted for separately from the covered loans as the agreement was not contractually part of the loans and were not transferrable should the Company have disposed of the loans.  Residential Mortgage Loans in Process of Foreclosure  Loans in process of foreclosure include those for which formal foreclosure proceedings are in process according to local requirements of the applicable jurisdiction. Included in loans are $7.1 million and $ 7.5 million of consumer loans secured by single family residential mortgage real estate that are in process of foreclosure as of December 31, 201 8 and 201 7 , respectively. In addition to the single family residential real estate loans in process of foreclosure, the Company also held $1.8 million and $ 3.4 million of foreclosed single family residential properties in other real estate owned as of December 31, 201 8 and 201 7 , respectively.  Loans Held for Sale  Loans held for sale totaled $28.1 million and $ 39.9 million, respectively, at December 31, 201 8 and 201 7 . Substantially all loans held for sale are residential mortgage loans originated on a best-efforts basis, whereby a commitment by a third party to purchase the loan has been received concurrent with the Bank’s commitment to the borrower to originate the loan.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property and Equipment [Abstract]
Property and Equipment	Note 5. Property and Equipment  Property and equipment consisted of the following as of December 31, 2018 and 2017:     December 31,  (in thousands) 2018 2017  Land and land improvements $ 70,960 $ 71,061  Buildings and leasehold improvements 311,409 305,277  Furniture, fixtures and equipment 92,805 92,360  Software 72,721 70,003  Assets under development 31,742 9,960  579,637 548,661  Accumulated depreciation and amortization (225,969) (214,998)  Property and equipment, net $ 353,668 $ 333,663  Assets under development is comprised primarily of building and leasehold improvements and software design and implementation costs. Depreciation and amortization expense was $26.5 million, $28.1 million and $28.4 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Property and Equipment Held for Sale  During the fourth quarter of 201 7 , the Company determined that certain property and equipment met the criteria to be classified as assets held for sale. The sale of these assets is expected to close in the first half of 2019 . The carrying value of $27.2 million has been recorded within Other Assets in the Consolidated Balance Sheet s as of December 31, 2018 and 201 7 . For more information on the Company's policy on assets held for sale, refer to Note 1 – Summary of Significant Account Policies and Recent Accounting Pronouncements.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	Note 6. Goodwill and Other Intangible Assets  Goodwill represents the excess of the consideration paid over the fair value of the net assets acquired or the excess of the fair value of the net liabilities assumed over the consideration received in a business combination . The acquisition of the trust and asset management business resulted in goodwill of $43.3 million during the year ended December 31, 2018, and the FNBC transactions resulted in goodwill of $124.3 million during the year ended December 31, 2017. The carrying amount of goodwill was $791.0 million and $745.5 million at December 31, 2018 and 2017, respectively . The Company completed its annual goodwill impairment test as of September 30, 2018 and concluded that there was no impairment of goodwill.  The Company used the discounted net present value of estimated future cash flows to measure the fair value of its goodwill at September 30, 2018 . The valuation technique used by the Company requires significant assumptions. Assumptions are made concerning the economic environment, expected net interest margins, growth rates, and discount rates for cash flows. Changes to these assumptions could result in significantly different results.  No goodwill impairment charges were recognized during 201 8 , 201 7 or 201 6 .  Identifiable intangible assets with finite lives are amortized over the periods benefited and are evaluated for impairment similar to other long-lived assets. The purchase and carrying value s of intangible assets subject to amortization as of December 31, 2018 and 2017 w ere as follows :      December 31, 2018  Purchase Accumulated Carrying  (in thousands) Value Amortization Value  Core deposit intangibles $ 215,955 $ 151,446 $ 64,509  Customer relationships 49,962 19,564 30,398  Merchant processing relationship 10,000 8,756 1,244  $ 275,917 $ 179,766 $ 96,151      December 31, 2017  Purchase Accumulated Carrying  (in thousands) Value Amortization Value  Core deposit intangibles $ 215,955 $ 132,878 $ 83,077  Customer relationships 22,400 16,882 5,518  Merchant processing relationship 10,000 7,955 2,045  $ 248,355 $ 157,715 $ 90,640  Aggregate amortization expense by category of finite lived intangible assets for the years ended December 31, 2018, 2017 and 2016 is as follows:     Years Ended December 31,  (in thousands) 2018 2017 2016  Core deposit intangibles $ 18,566 $ 19,442 $ 16,411  Customer relationships 2,682 1,975 2,172  Merchant processing relationship 802 1,000 1,198  $ 22,050 $ 22,417 $ 19,781  The weighted-average remaining life of core deposit intangibles is approximately 8 years. The weighted-average remaining life of other identifiable intangibles is approximately 15 years.  The following table shows estimated amortization expense of other intangible assets as of December 31, 2018 for the five succeeding years and thereafter, calculated based on current amortization schedules.     (in thousands)  2019 $ 19,859  2020 15,924  2021 12,953  2022 10,599  2023 8,401  Thereafter 28,415  $ 96,151

Time Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2018
Time Deposits [Abstract]
Time Deposits	Note 7. Time Deposits  The following table presents a detail of deposits at December 31, 2018 and 2017:      December 31,  (in thousands) 2018 2017  Noninterest-bearing deposits $ 8,499,027 $ 8,307,497  Interest-bearing retail transaction and savings deposits 8,000,092 8,181,555  Interest-bearing public fund deposits  Public fund transaction and savings deposits 2,622,938 2,763,182  Public fund time deposits 383,578 277,136  Total interest-bearing public fund deposits 3,006,516 3,040,318  Retail time deposits 2,416,086 1,906,768  Brokered time deposits 1,228,464 817,064  Total interest-bearing deposits 14,651,158 13,945,705  Total deposits $ 23,150,185 $ 22,253,202  The maturity of time deposits at December 31, 201 8 follows.     (in thousands)  2019 $ 3,235,947  2020 504,374  2021 209,149  2022 62,399  2023 13,848  Thereafter 2,411  Total time deposits $ 4,028,128  Certificates of deposit in amounts greater than $250,000 totaled approximately $1 bi llion at December 31, 2018 .

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2018
Short-Term Borrowings [Abstract]
Short-Term Borrowings	Note 8. Short-Term Borrowings  The following table presents information concerning short-term borrowing at and for the years ended December 31, 2018 and 2017:     December 31,  (in thousands) 2018 2017  Federal funds purchased:  Amount outstanding at period end $ 425 $ 140,754  Average amount outstanding during period 39,968 27,063  Maximum amount at any month end during period 100,925 140,754  Weighted-average interest at period end 2.00% 1.00%  Weighted-average interest rate during period 2.11% 1.37%  Securities sold under agreements to repurchase:  Amount outstanding at period end $ 428,599 $ 430,569  Average amount outstanding during period 456,000 501,719  Maximum amount at any month end during period 500,345 587,569  Weighted-average interest at period end 0.32% 0.17%  Weighted-average interest rate during period 0.23% 0.12%  FHLB borrowings:  Amount outstanding at period end $ 1,160,104 $ 1,132,567  Average amount outstanding during period 1,694,804 1,478,114  Maximum amount at any month end during period 2,410,258 2,061,652  Weighted-average interest at period end 2.48% 1.35%  Weighted-average interest rate during period 2.02% 1.00%  Federal funds purchased represent unsecured borrowings from other banks, generally on an overnight basis.  Securities sold under agreements to repurchase (“repurchase agreements”) are funds borrowed on a secured basis by selling securities under agreements to repurchase, mainly in connection with treasury-management services offered to deposit customers. The customer repurchase agreements mature daily and are secured by agency securities. As the Company maintains effective control over assets sold und er agreements to repurchase, the securities continue to be carried on the consolidated statements of financial condition. Because the Company acts as borrower transferring assets to the counterparty, and the agreements mature daily, the Company’s risk is very limited.  The $ 1.2 billion of FHLB borrowings at December 31, 2018 consists of th ree fixed rate notes totaling $250 million that mature in 2019 , and six variable rate notes totaling $ 910 million maturing from 2020 to 2026 . These notes reprice monthly or quarterly and may be repaid at our option, either in whole o r in part, on any monthly repri cing date, subject to a two week advanced notice.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2018
Long-Term Debt [Abstract]
Long-Term Debt	Note 9 . Long- T erm Debt  As of December 31, 2018 and 2017, l ong-term debt was comprised of the following:     December 31,  (in thousands) 2018 2017  Subordinated notes payable, maturing June 2045 $ 150,000 $ 150,000  Term note payable, maturing December 2018 — 89,200  Other long-term debt 79,598 71,378  Less: unamortized debt issuance costs (4,605) (5,065)  Total long-term debt $ 224,993 $ 305,513   The following table sets forth unamortized debt issuance costs associated with the respective debt instruments as of December 31, 201 8 :    Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 4,605  Other long-term debt 79,598 —  Total $ 229,598 $ 4,605  On March 9, 2015 , the Company completed the issuance of subordinated notes payable with an aggregate principal amount of $150 million, maturing on June 15, 2045 . These notes accrue interest at a fixed rate of 5.95% per annum, with quarterly interest payments which began in June 2015 . Subject to prior approval by the Federal Reserve, the Company may redeem the notes in whole or in part on any interest payment date on or after June 15, 2020 . This debt qualifies as t ier 2 capital in the calculation of certain regulatory capital ratios.  On December 18, 2015, the Company entered into a senior unsecured single-draw term loan facility totaling $125 million, which was drawn on the closing date. Amounts borrowed under the loan facility b o r e variable rate interest of LIBOR plus 1.50% per an num. The loan agreement required quarterly principal payments of $4.5 million, and allowed outstanding borrowings to be repaid in whole or in part at any time prior to the December 18, 2018 maturity date without premium or penalty, subject to reimbursement of certain lenders’ costs. The Company paid down a portion of the debt during the second quarter of 2018, and repaid the remaining principal balance during the third quarter 2018 .  Substantially all of the Company’s other long-term debt consists of borrowings associated with tax credit fund activities. Although these borrowings have indicated maturities through 2053 , each is expected to be satisfied at the end of the seven -year compliance period for the related tax credit investments. 

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2018
Derivatives [Abstract]
Derivatives	Note 10. Derivatives On January 1, 2018, the Company adopted the provisions of Accounting Standards Update (ASU) 2017-12, “Derivatives and Hedging,” using the modified retrospective transition approach. As a result of adoption of the update, the Company has made certain adjustments to its existing designation documentation for active hedging relationships to take advantage of specific provisions of the update. Adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations. Following is a discussion of the provisions of the guidance relevant to the Company: Ineffectiveness measurement and presentation The provisions of the update eliminate the concept of ineffectiveness from an accounting perspective. The guidance provides that, as long as a hedging instrument is designated and the results of the effectiveness testing support that the instrument qualifies for hedge accounting treatment, there will be no periodic measurement or recognition of ineffectiveness. Rather, the full impact of hedge gains and losses will be recognized in the period in which the hedged transactions impact the entity’s earnings. Presentation of reclassifications from Accumulated Other Comprehensive Income The update provides that amounts in Accumulated Other Comprehensive Income that are included in the assessment of effectiveness should be reclassified into earnings in the same period in which the hedged forecasted transactions impact earnings. As such, the Company will recognize all reclassifications out of Other Comprehensive Income in the same statement of income line item in which the earnings effect of the hedged item is presented. Changes to hedged risk The update also states that if the designated hedged risk changes during the life of the hedging relationship, an entity may continue to apply hedge accounting as long as the hedging instrument is highly effective at achieving offsetting cash flows attributable to the revised hedged risk. Regardless of the description of the hedged transactions contained in the initial designation documentation, the Company intends to utilize this provision in the updated guidance to the extent possible. Risk component hedging in fair value hedges The update allows an entity to make a one-time transition election regarding the fair value measurement methodology applied to fair value hedges in place at adoption. The Company did not elect either of the one-time transition options; rather, it will continue to measure the hedged items as documented in the initial hedge documentation.  Risk Management Objective of Using Derivatives  The Company enters into derivative financial instruments to manage risks related to differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments, primarily related to select pools of variable rate loans and obligations under brokered certificates of deposit. The Bank has also entered into interest rate and foreign currency exchange derivative agreements as a service to certain qualifying customers. The Bank manages a matched book with respect to these customer derivatives in order to minimize their net risk exposure resulting from such agreements. The Bank also enters into risk participation agreements under which it may either sell or buy credit risk associated with a customer’s performance under certain interest rate derivative contracts related to loans in which participation interests have been sold to or purchased from other banks.  Fair Values of Derivative Instruments on the Balance Sheet  The table below presents the notional amounts and fair values of the Company’s derivative financial instruments as well as their classification in the consolidated balance sheets as of December 31, 201 8 and 201 7 .      December 31, 2018 December 31, 2017  Derivative (1) Derivative (1)  (in thousands) Type of Hedge Notional or Contractual Amount Assets Liabilities Notional or Contractual Amount Assets Liabilities  Derivatives designated  as hedging instruments:  Interest rate swaps Cash Flow $ 875,000 $ 3,954 $ 9,173 $ 875,000 $ — $ 14,020  Interest rate swaps Fair Value 483,110 — 2,089 483,110 — 2,475  $ 1,358,110 $ 3,954 $ 11,262 $ 1,358,110 $ — $ 16,495  Derivatives not designated  as hedging instruments:  Interest rate swaps (2) N/A $ 1,277,404 $ 23,670 $ 24,669 $ 1,144,789 $ 15,408 $ 15,857  Risk participation agreements N/A 171,222 10 131 119,951 23 109  Forward commitments to sell  residential mortgage loans N/A 77,208 110 664 80,462 1,000 290  Interest rate-lock commitments  on residential mortgage loans N/A 59,119 464 67 53,724 186 782  Foreign exchange forward  contracts N/A 37,749 751 718 42,260 2,453 2,419  Visa Class B derivative contract N/A 43,753 — 7,304 — — —  $ 1,666,455 $ 25,005 $ 33,553 $ 1,441,186 $ 19,070 $ 19,457  Total derivatives $ 3,024,565 $ 28,959 $ 44,815 $ 2,799,296 $ 19,070 $ 35,952  Less: netting adjustments (3) (11,979) (22,588) (4,913) (21,563)  Total derivate assets/liabilites 16,980 22,227 14,157 14,389  (1) Derivative assets and liabilities are reported in other assets or other liabilities, respectively, in the consolidated balance sheets. (2) The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions. (3) Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.  Cash Flow Hedges of Interest Rate Risk  The Company is party to various interest rate swap agreements designated and qualifying as cash flow hedges of the Company’s forecasted variable cash flows for pools of variable rate loans. For each agreement, the Company receives interest at a fixed rate and pay s at a variable rate. During the year ended December 31, 2018, the Company terminated five of its shorter-term swap agreements with notional amounts totaling $450 million and entered into five longer-term agreements with notional amounts totaling $450 million. The Company paid termination fees of approximately $10.6 million to settle the interest rate swap liabilities. During the year ended December 31, 2017, the Company terminated two swap agreements and paid termination fees of approximately $1.1 million. The resulting accumulated other comprehensive loss is being amortized over the remaining maturities of the designated instruments . Amortization of other comprehensive loss on terminated cash flow hedges totaled $ 6.0 million and $0.6 million for the years ended December 31, 2018 and 2017 , respectively. The notional amounts of the swap agreements in place at December 31, 2018 expire as follows: $425 million in 2022 ; $350 million in 2023 ; $100 million in 2024 .  Fair Value Hedges of Interest Rate Risk  The Company is party to interest rate swap agreements that modify the Company’s exposure to interest rate risk by effectively converting a portion of the Company’s brokered certificates of deposit from fixed rates to variable rates. The maturities and call features of these interest rate swaps match the features of the hedged deposits. As interest rates fall, the decline in the value of the certificates of deposit is offset by the increase in the value of the interest rate swaps. Conversely, as interest rates rise, the value of the underlying hedged deposits increases, but the value of the interest rate swaps decreases, resulting in no impact on earnings. Interest expense is adjusted by the difference between the fixed and floating rates for the period the swaps are in effect. Hedge ineffectiveness on these transactions results in an increase or decrease in noninterest income.  Derivatives Not Designated as Hedges  Customer interest rate derivative program The Bank enters into interest rate derivative agreements, primarily rate swaps, with commercial banking customers to facilitate their risk management strategies. The Bank enters into offsetting agreements with unrelated financial institutions, thereby mitigating its net risk exposure resulting from such transactions. Because the interest rate derivatives associated with this program do not meet hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.  Risk participation agreements  The Bank also enters into risk participation agreements under which it may either assume or sell credit risk associated with a borrower’s performance under certain interest rate derivative contracts. In those instances where the Bank has assumed credit risk, it is not a direct counterparty to the derivative contract with the borrower and has entered into the risk participation agreement because it is a party to the related loan agreement with the borrower. In those instances in which the Bank has sold credit risk, it is the sole counterparty to the derivative contract with the borrower and has entered into the risk participation agreement because other banks participate in the related loan agreement. The Bank manages its credit risk under risk participation agreements by monitoring the creditworthiness of the borrower, based on the Bank’s normal credit review process.  Mortgage banking derivatives  The Bank also enters into certain derivative agreements as part of its mortgage banking activities. These agreements include interest rate lock commitments on prospective residential mortgage loans and forward commitments to sell these loans to investors on a best efforts delivery basis.  Customer foreign exchange forward contract derivatives  The Bank enters into foreign exchange forward derivative agreements, primarily forward foreign currency contracts, with commercial banking customers to facilitate their risk management strategies. The Bank manages its risk exposure from such transactions by entering into offsetting agreements with unrelated financial institutions. Because the foreign exchange forward contract derivatives associated with this program do not meet hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.  Visa Class B derivative contract  As a member of Visa U.S.A. Inc. (“Visa USA”), the Company received a certain number of Visa Class B common shares following the 2007 restructuring of Visa USA and its affiliates and the 2008 initial public offering of Visa Inc. (“Visa”). The Visa Class B common shares are subject to certain selling restrictions until the final resolution of certain litigation related to interchange fees involving Visa (the “covered litigation”), at which time the shares are convertible into Visa Class A common shares based on a conversion rate dependent upon the ultimate cost of resolving the covered litigation.  During the fourth quarter of 2018, the Company sold the majority of its Visa Class B holdings, at which time it entered into a derivative agreement with the purchaser whereby the Company will make or receive cash payments whenever the conversion ratio of the Visa Class B shares into Visa Class A shares is adjusted. The conversion ratio changes when Visa deposits funds to a litigation escrow established by Visa to pay settlements for certain litigation, for which Visa is indemnified by Visa USA members. The Company is also required to make periodic financing payments to the purchaser until all of Visa’s covered litigation matters are resolved. Thus, the derivative contract extends until the end of Visa’s Covered Litigation matters, the timing of which is uncertain. The contract includes a contingent accelerated termination clause based on the credit ratings of the Company. As of December 31, 2018, the Company had not received or paid collateral related to this contract, and the fair value of the liability associated with this contract was $7.3 million. Refer to Note 19 – Fair Value of Financial Instruments for discussion of the valuation inputs and process for this derivative liability.  Effect of Derivative Instruments on the Statements of Income  The effects of derivative instruments on the consolidated statements of income for the years ended December 31 , 2018 , 2017 and 2016 are presented in the table below. For the years ended December 31 , 2018 and 2017 , the reduction of interest income attributable to cash flow hedges includes amortization of accumulated other comprehensive loss that resulted from termination of certain interest rate swap contracts.      Year Ended  December 31,  Derivative Instruments: Location of Gain (Loss) Recognized in the Statement of Income: 2018 2017 2016  Interest rate swaps - cash flow hedges Interest income $ (4,497) $ (280) $ 2,310  Interest rate swaps - fair value hedges Interest expense (2,343) 829 -  All other instruments Other noninterest income 5,368 5,870 5,196  Total $ (1,472) $ 6,419 $ 7,506  Credit Risk-Related Contingent Features  Certain of the Bank’s derivative instruments contain provisions allowing the financial counterparty to terminate the contracts in certain circumstances, such as the downgrade of the Bank’s credit ratings below specified levels, a default by the Bank on its indebtedness, or the failure of the Bank to maintain specified minimum regulatory capital ratios or its regulatory status as a well-capitalized institution. These derivative agreements also contain provisions regarding the posting of collateral by each party. As of December 31, 201 8 , the Company was not in violation of any such provisions.  Offsetting Assets and Liabilities  The Bank’s derivative instruments to certain counterparties contain legally enforceable netting provisions that allow for net settlement of multiple transactions to a single amount, which may be positive, negative, or zero. Agreements with certain bilateral counterparties require both parties to maintain collateral in the event that the fair values of derivative instruments exceed established exposure thresholds. For centrally cleared derivatives, the Company is subject to initial margin posting and daily variation margin exchange with the central clearinghouses. The Company reflects its derivative assets and liabilities net of the central clearing party variation margin account in the Statements of Income. Offsetting information in regards to derivative assets and liabilities subject to these master netting agreements at December 31, 201 8 and 201 7 is presented in the following tables:     December 31, 2018  Gross Amounts Offset in the Net Amounts Presented in the Gross Amounts Not Offset in the Statement of Financial Position  (in thousands) Gross Amounts Recognized Statement of Financial Position Statement of Financial Position Financial Instruments Cash Collateral Net Amount  Derivative Assets $ 16,167 $ (12,842) $ 3,325 $ 1,846 $ — $ 1,479  Derivative Liabilities $ 23,811 $ (21,651) $ 2,160 $ 1,846 $ 2,871 $ (2,557)      December 31, 2017  Gross Amounts Offset in the Net Amounts Presented in the Gross Amounts Not Offset in the Statement of Financial Position  (in thousands) Gross Amounts Recognized Statement of Financial Position Statement of Financial Position Financial Instruments Cash Collateral Net Amount  Derivative Assets $ 7,155 $ (5,007) $ 2,148 $ 2,148 $ — $ —  Derivative Liabilities $ 24,015 $ (20,077) $ 3,938 $ 2,148 $ 4,099 $ (2,309)  The Company has excess collateral compared to total exposure due to initial margin requirements for day-to-day rate volatility.     

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity [Abstract]
Stockholders' Equity	Note 11. Stockholders’ Equity  Common Shares Outstanding  Shares outstanding exclude treasury shares of 0.9 million and 1.2 million with a first-in-first-out cost basis of $18 .5 million and $ 25.5 million at December 31, 2018 and 2017, respectively. Shares outstanding also exclude unvested restricted share awards of 1. 3 million and 1.5 million at December 31, 2018 and 2017, respectively.  Stock Repurchase Program  On May 24, 2018, the Company’s board of directors approved a stock buyback program that authorized the repurchase of up to 5% , or approximately 4.3 million shares of its outstanding common stock. The approved program allows the Company to repurchase its common shares either in the open market in compliance with Rule 10b-18 promulgated under the Securities Exchange Act of 1934, as amended, or in privately negotiated transactions with non-affiliated sellers or as otherwise determined by the Company in one or more transactions, from time to time until December 31, 2019. The Company is not obligated to purchase any shares under this program, and the board of directors may terminate or amend the program at any time prior to the expiration date. During the fourth quarter of 2018, the Company repurchased 200,000 shares of its common stock at an average price of $41.30 per share.  Stock Issuance  On December 16, 2016, the Company completed the issuance and sale of 6.3 million shares of common stock at a purchase price of $41.00 per share for total proceeds of $259 million, net of issuance cost. A portion of the proceeds were to support the purchase of assets in the FNBC I transaction.  Accumulated Other Comprehensive Income (Loss)  A roll forward of the components of AOCI is included as follows:     (in thousands) Available for Sale Securities HTM Securities Transferred from AFS Employee Benefit Plans Cash Flow Hedges Total  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Net change in unrealized gain (loss) (49,839) — — (7,507) (57,346)  Reclassification of net (gain) loss realized  and included in earnings (1,912) — 5,928 — 4,016  Valuation adjustment for employee benefit plans — — (12,748) — (12,748)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,830 — — 3,830  Income tax expense (benefit) (18,804) 1,427 (2,209) (2,725) (22,311)  Balance, December 31, 2016 $ (28,679) $ (14,392) $ (72,501) $ (4,960) $ (120,532)  Net change in unrealized (loss) gain 6,903 — — (7,328) (425)  Reclassification of net loss realized  and included in earnings — — 5,201 600 5,801  Valuation adjustment for pension plan amendment — — 17,315 — 17,315  Other valuation adjustment for employee benefit plans — — (10,929) — (10,929)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,786 — — 3,786  Income tax expense (benefit) 1,067 1,393 4,228 (2,600) 4,088  Reclassification of certain tax effects (a) 6,669 2,586 13,936 2,139 25,330  Balance, December 31, 2017 $ (29,512) $ (14,585) $ (79,078) $ (11,227) $ (134,402)  Net change in unrealized loss (52,060) — — (697) (52,757)  Reclassification of net loss realized  and included in earnings 25,480 — 4,989 4,497 34,966  Other valuation adjustment for employee benefit plans — — (45,198) — (45,198)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,296 — — 3,296  Income tax expense (benefit) (5,967) 755 (9,040) 866 (13,386)  Balance, December 31, 2018 $ (50,125) $ (12,044) $ (110,247) $ (8,293) $ (180,709)  (a) Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.  AOCI is reported as a component of stockholders’ equity. AOCI includes unrealized gains and losses on available for sale (“AFS”) securities and unrealized losses on AFS securities that were transferred to held to maturity (“HTM”) securities in the third quarter of 2013. Such amounts on the transferred securities are being amortized over the estimated remaining life of the security as an adjustment to yield, offsetting the related amortization of the net premium created in the transfer. Subject to certain thresholds, unrealized losses on employee benefit plans will be reclassified into income as pension and post retirement costs are recognized over the remaining service period of plan participants. Accumulated gains/losses on the cash flow hedge of the variable-rate loans described in Note 10 - Derivatives will be reclassified into income over the life of the hedge. Gains (losses) in AOCI are net of deferred income taxes.  The following table shows the line items in the consolidated statements of income affected by amounts reclassified from AOCI:     Amount reclassified from AOCI (a) Years Ended December 31, Increase (decrease) in affected line  (in thousands) 2018 2017 item in the statements of income  Gain (loss) on sale of AFS securities $ (25,480) $ — Securities transactions  Tax effect 5,720 — Income taxes  Net of tax (19,760) — Net income  Amortization of unrealized net loss on  securities transferred to HTM $ (3,296) $ (3,786) Interest income  Tax effect 755 1,393 Income taxes  Net of tax (2,541) (2,393) Net income  Amortization of defined benefit pension and  post-retirement items $ (4,989) $ (5,201) Other noninterest expense  Tax effect 1,122 1,898 Income taxes  Net of tax (3,867) (3,303) Net income  Reclassification of unrealized gain on cash flow hedges $ 1,072 $ — Interest income  Tax effect (244) — Income taxes  Net of tax 828 — Net income  Amortization of loss on terminated cash flow hedges (5,569) (600) Interest expense  Tax effect 1,269 232 Income taxes  Net of tax (4,300) (368) Net income  Total reclassifications, net of tax $ (30,468) $ (6,064) Net income  (a) Amounts in parenthesis indicate reduction in net income.  Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income  The Company retrospectively adopted ASU 2018-02, “ Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income .” The ASU was issued by the FASB in February 2018 to address the issue of other comprehensive income or loss that became stranded in AOCI as a result of the re-measurement of an entity’s deferred income tax assets and liabilities following the reduction of the U.S. federal corporate tax rate from 35% to 21%. In accordance with the guidance, the Company reclassified $25.3 million from Accumulated Other Comprehensive Loss to Retained Earnings. Refer to Note 1 – Summary of Significant Accounting Policies and Recent Accounting Pronouncements and Note 13 – Income Taxes for further discussion.  Regulatory Capital  Measures of regulatory capital are an important tool used by regulators to monitor the financial health of financial institutions. The primary quantitative measures used to gauge capital adequacy are Common equity tier 1, Tier 1 and Total regulatory capital to risk-weighted assets (risk-based capital ratios) and the Tier 1 capital to average total assets (leverage ratio). Both the Company and the Bank subsidiary are required to maintain minimum risk-based capital ratios of 8.0% total capital, 4.5% Tier 1 Common Equity, and 6.0% Tier 1 capital. The minimum leverage ratio is 3.0% for bank holding companies and banks that meet certain specified criteria, including having the highest supervisory rating. All others are required to maintain a leverage ratio of at least 4.0% .  To evaluate capital adequacy, regulators compare an institution’s regulatory capital ratios with their agency guidelines, as well as with the guidelines established as part of the uniform regulatory framework for prompt corrective supervisory action toward financial institutions. The framework for prompt corrective action categorizes capital levels into one of five classifications rating from well-capitalized to critically under-capitalized. For an institution to be eligible to be classified as well capitalized its total risk-based capital ratios must be at least 10.0% for total capital, 6.5% for Tier 1 Common Equity and 8.0% for Tier 1 capital, and its leverage ratio must be at least 5.0% . In reaching an overall conclusion on capital adequacy or assigning a classification under the uniform framework, regulators also consider other subjective and quantitative measures of risk associated with an institution. The Company and the Bank were deemed to be well capitalized based upon the most recent notifications from t heir regulators. There are no conditions or events since those notifications that management believes would change the classifications. At December 31, 201 8 and 201 7 , the Company and the Bank were in compliance with all of their respective minimum regulatory capital requirements.  Following is a summary of the actual regulatory capital amounts and ratios for the Company and the Bank together with corresponding regulatory capital requirements at December 31, 201 8 and 201 7. The Company’s and Bank’s regulatory filings for quarters ending March 31, 2018 and prior were filed in the names of Hancock Holding Company and Whitney Bank, respectively.       Actual Required for Minimum Capital Adequacy Required To Be Well Capitalized  ($ in thousands) Amount Ratio % Amount Ratio % Amount Ratio %  At December 31, 2018  Tier 1 leverage capital  Hancock Whitney Corporation $ 2,391,762 8.67 $ 1,103,544 4.00 $ 1,379,430 5.00  Hancock Whitney Bank 2,351,090 8.54 1,101,372 4.00 1,376,715 5.00  Common equity tier 1 (to risk weighted assets)  Hancock Whitney Corporation $ 2,391,762 10.48 $ 1,026,637 4.50 $ 1,482,920 6.50  Hancock Whitney Bank 2,351,090 10.32 1,025,355 4.50 1,481,068 6.50  Tier 1 capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,391,762 10.48 $ 1,368,849 6.00 $ 1,825,132 8.00  Hancock Whitney Bank 2,351,090 10.32 1,367,140 6.00 1,822,853 8.00  Total capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,736,276 11.99 $ 1,825,132 8.00 $ 2,281,415 10.00  Hancock Whitney Bank 2,545,604 11.17 1,822,053 8.00 2,278,566 10.00  At December 31, 2017  Tier 1 leverage capital  Hancock Whitney Corporation $ 2,214,723 8.43 $ 1,051,025 4.00 $ 1,313,781 5.00  Hancock Whitney Bank 2,282,485 8.72 1,046,644 4.00 1,308,305 5.00  Common equity tier 1 (to risk weighted assets)  Hancock Whitney Corporation $ 2,214,723 10.21 $ 976,303 4.50 $ 1,410,216 6.50  Hancock Whitney Bank 2,282,485 10.54 974,362 4.50 1,407,412 6.50  Tier 1 capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,214,723 10.21 $ 1,301,738 6.00 $ 1,735,650 8.00  Hancock Whitney Bank 2,282,485 10.54 1,299,150 6.00 1,732,200 8.00  Total capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,582,031 11.90 $ 1,735,650 8.00 $ 2,169,563 10.00  Hancock Whitney Bank 2,499,793 11.55 1,732,200 8.00 2,165,250 10.00  Regulatory Restrictions on Dividends  Regulatory policy statements provide that generally bank holding companies should pay dividends only out of current operating earnings and that the level of dividends must be consistent with current and expected capital requirements. Dividends received from the Bank have been the primary source of funds available to the Company for the payment of dividends to its stockholders. Federal and state banking laws and regulations restrict the amount of dividends the Bank may distribute to the Company without prior regulatory approval, as well as the amount of loans it may make to the Company. Dividends paid by the Bank are subject to approval by the Commissioner of Banking and Consumer Finance of the State of Mississippi.

Noninterest Income and Noninter

Noninterest Income and Noninterest Expense	12 Months Ended
	Dec. 31, 2018
Noninterest Income and Noninterest Expense [Abstract]
Noninterest Income and Noninterest Expense	Note 12. Noninterest Income and Noninterest Expense  During the fourth quarter of 2018, the Company sold the majority of its holdings of Visa Class B common shares. The sale resulted in a gain of approximately $33.2 million, which is included in net gain on sales of assets on the Consolidated Statement of Income. For more information on the circumstances surrounding the sale, refer to Note 10 – Derivatives.   The components of other noninterest income and other noninterest expense are as follows:       Years Ended December 31,  (in thousands) 2018 2017 2016  Other noninterest income:  Income from bank-owned life insurance $ 12,424 $ 11,473 $ 13,596  Credit-related fees 11,065 11,140 9,926  Other miscellaneous income 20,297 19,684 16,146  Total other noninterest income $ 43,786 $ 42,297 $ 39,668   Other noninterest expense:  Advertising $ 12,334 $ 15,031 $ 10,938  Corporate value and franchise taxes 13,595 12,797 8,741  Entertainment and contributions 11,359 8,260 7,122  Telecommunications and postage 14,659 14,686 13,146  Other retirement expense (18,661) (15,249) (10,496)  Other miscellaneous expense 47,407 46,548 45,313  Total other noninterest expense $ 80,693 $ 82,073 $ 74,764 

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Income Taxes	Note 13. Income Taxes  Income tax expense included in net income consisted of the following components:      Years Ended December 31,  (in thousands) 2018 2017 2016  Included in net income  Current federal $ 7,594 $ 38,859 $ 43,777  Current state 5,538 4,112 1,689  Total current provision 13,132 42,971 45,466  Deferred federal 41,078 48,653 (6,127)  Deferred state 4,136 1,178 (1,712)  Total deferred provision 45,214 49,831 (7,839)  Total included in net income $ 58,346 $ 92,802 $ 37,627  During the year ended December 31, 2017, our deferred tax assets and liabilities were re-measured to reflect the lower income tax rate as a result of the Tax Cut and Jobs Act (“Tax Act”). ASU 2018-05 provided a measurement period not to exceed one year from the enactment date of the Tax Act to record amounts related to the impacts of the Tax Act. At December 31, 2018, the measurement period has transpired; no adjustments were deemed necessary to the provisional amounts originally recorded.  Except for the 2017 re-measurement charge of deferred tax asset related to AOCI, income tax expense does not reflect the tax effects of amounts recognized in other comprehensive income and in AOCI, a separate component of stockholders’ equity. These amounts include unrealized gains and losses on securities available for sale or transferred to held to maturity, unrealized gains and losses on derivatives and hedging transactions, and valuation adjustments of defined benefit and other post-retirement benefit plans. Refer to Note 11 – Stockholders’ Equity for additional information.  Temporary differences arise between the tax bases of assets or liabilities and their carrying amounts for financial reporting purposes. The expected tax effects from when these differences are resolved are recorded currently as deferred tax assets or liabilities.  Significant components of the Company’s deferred tax assets and liabilities were as follows:      December 31,  (in thousands) 2018 2017  Deferred tax assets:  Allowance for loan losses $ 45,198 $ 51,517  Employee compensation and benefits 12,796 9,783  Loan purchase accounting adjustments 1,132 6,441  Tax credit carryforward 2,059 21,274  Securities 17,390 12,250  State net operating loss 1,629 1,979  Other 18,431 13,763  Gross deferred tax assets 98,635 117,007  State valuation allowance (1,629) (1,979)  Net deferred tax assets 97,006 115,028  Deferred tax liabilities:  Fixed assets & intangibles (44,277) (42,597)  Lease financing (23,605) (12,285)  Other (6,157) (6,167)  Gross deferred tax liabilities (74,039) (61,049)  Net deferred tax asset $ 22,967 $ 53,979  Reported income tax expense differed from amounts computed by applying the statutory income tax rate of 21% for the year ended December 31, 2018 and 35% for the years ended December 31, 2017 and 2016 to earnings before income taxes. The primary differences are due to tax-exempt income , federal and state tax credits , excess tax benefits from stock-based compensation (beginning January 1, 2017 following the adoption of ASU 2016-09), and for 2018, a return to provision tax benefit realized from deductions claimed on the 2017 income tax returns associated with various tax initiatives associated with fixed assets and the pension plan , among other things. The main source of tax credits has been investments in tax-advantaged securities and tax credit projects. See the table in the Income Taxes section of Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” for additional information regarding federal and state tax credits. A summary of the factors that impa cted income tax expense follows.      Years Ended December 31,  2018 2017 2016  ($ in thousands) Amount % Amount % Amount %  Taxes computed at statutory rate $ 80,244 21.0 % $ 107,952 35.0 % $ 65,423 35.0 %  Increases (decreases) in taxes resulting from:  State income taxes, net of federal income  tax benefit 8,770 2.3 4,288 1.4 2,104 1.1  Tax-exempt interest (10,803) (2.8) (18,870) (6.1) (14,497) (7.8)  Bank owned life insurance (2,019) (0.5) (5,360) (1.7) (4,833) (2.6)  Tax credits (11,344) (3.0) (9,286) (3.1) (10,410) (5.6)  Employee share-based compensation (1,380) (0.3) (5,824) (1.9) — —  FDIC assessment disallowance 2,818 0.7 — — — —  Return to provision adjustment (9,942) (2.6) (120) — (549) (0.3)  Impact of deferred tax asset re-measurement — — 19,520 6.3 — —  Other, net 2,002 0.5 502 0.2 389 0.3  Income tax expense $ 58,346 15.3 % $ 92,802 30.1 % $ 37,627 20.1 %  As of December 31, 201 8 , the Company had approximately $2.1 million in state tax credit carryforwards that originated in the tax years from 2011 through 2018 and begin expiring in 2021 . These carryforwards are primarily from investments in state NMTC projects.  The Company had approximately $27.6 million in state net operating loss carryforwards that originated in the tax years 2004 through 2017 and begin expiring in 2024 . A valuation allowance has been established for the state net operating loss carryforwards. The impact of this valuation allowance is immaterial to the financial statements.  The tax benefit of a position taken or expected to be taken in a tax return should be recognized when it is more likely than not that the position will be sustained on its technical merits . The liability for unrecognized tax benefits was immaterial at December 31, 2018 , 2017 and 2016 . The Company does not expect the liability for unrecognized tax benefits to change significantly during 2019 . The Company recognizes interest and penalties, if any, related to income tax matters in income tax expense, and the amounts recognized during 2018 , 2017 and 2016 were insignificant.  The Company and its subsidiaries file a consolidated U.S. federal income tax return, as well as filing various state returns. Generally, the returns for years prior to 2015 are no longer subject to examination by taxing authorities.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Note 14. Earnings Per Share  Earnings per share is calculated using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. Participating securities consist of unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents.  A summary of the information used in the computation of earnings per common share follows:      Years Ended December 31,  ($ in tho usands, except per share data ) 2018 2017 2016  Numerator:  Net income to common shareholders $ 323,770 $ 215,632 $ 149,296  Net income allocated to participating securities -- basic and diluted 5,930 4,670 3,598  Net income allocated to common shareholders - basic and diluted $ 317,840 $ 210,962 $ 145,698  Denominator:  Weighted-average common shares - basic 85,355 84,695 77,850  Dilutive potential common shares 166 268 99  Weighted average common shares - diluted 85,521 84,963 77,949  Earnings per common share:  Basic $ 3.72 $ 2.49 $ 1.87  Diluted $ 3.72 $ 2.48 $ 1.87  Potential common shares consist of employee and director stock options, unvested performance share awards, and deferred restricted units. These potential common shares do not enter into the calculation of diluted earnings per share if the impact would be anti-dilutive, i.e., increase earnings per share or reduce a loss per share. Weighted-average anti-dilutive potential common shares totaled 5,129 for the year ended December 31, 2018 , 10,551 for the year ended December 31, 2017 , and 572,512 for the year ended December 31, 2016 .

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	Note 15. Segment Reporting  Accounting standards require that information be reported about a company’s operating segments using a “management approach.” Reportable segments are identified in these standards as those revenue-producing components for which discrete financial information is produced internally and which are subject to evaluation by the chief operating decision maker in deciding how to allocate resources to segments. Consistent with t he Company ’s strategy that is focused on providing a consistent package of banking products and services across all markets, the Company has identified its overall banking operations as its only reportable segment. Because the overall banking operations comprise substantially all of the consolidated operations, no separate segment disclosures are presented. 

Retirement Benefit Plans

Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefit Plans [Abstract]
Retirement Benefit Plans	Note 16. Retirement Benefit Plans  The Company offers a qualified defined benefit pension plan, the Hancock Whitney Corporation Pension Plan and Trust Agreement (“Pension Plan”), covering certain eligible associates. Eligibility is based on minimum age and service-related requirements. During the second quarter of 2017, the Pension Plan was amended to exclude any individual hired or rehired by the Company after June 30, 2017 from eligibility to participate. The Pension Plan a mendment further provided that the accrued benefits of each participant in the Pension Plan whose combined age plus years of service as of January 1, 2018 totals less than 55 wer e to be frozen as of January 1, 2018 and not thereafter increase. As a result of the plan amendments, pension assets and the benefit obligations were re-measured as of June 30, 2017. The impact of the amendment to the benefit obligation was a reduction of $17.3 million. The Company makes contributions to this pension plan in amounts sufficient to meet funding requirements set forth in federal employee benefit and tax laws, plus such additional amounts as the Company may determine to be appropriate. The Company was not required to make a contribution to the Pension Plan during 2018 or 2017. During 2018, the Company made a discretionary contribution of $39 million designated to the 2017 plan year as part of its income tax initiatives. Market conditions during the latter part of 2018 resulted in a decline in the Pension Plan’s asset value. The Company made a $100 million discretionary contribution to the Pension Plan during the first quarter of 2019, the timing and amount of which was determined with the intent to optimize investment return. The Company does not anticipate being required to make a contribution, nor does it anticipate making further discretionary contributions to the Pension Plan during 2019.  The Company also offers a defined contribution retirement benefit plan (401(k) plan), the Hancock Whitney Corporation 401(k) Savings Plan and Trust Agreement (“401(k) Plan”), that covers substantially all associates who have been employed 60 days and meet a minimum age requirement and employment classification criteria. The Company matches 100% of the first 1% of compensation saved by a participant, and 50% of the next 5% of compensation saved. Newly eligible associates are automatically enrolled at an initial 3% savings rate unless the associate actively opts out of participation in the plan. The 401(k) Plan was also amended during the second quarter of 2017 for participants whose benefits are frozen under the Pension Plan to add an enhanced Company contribution beginning January 1, 2018, in the amount of 2% , 4% or 6% of such participant’s eligible compensation, based on the participant’s age and years of service with the Company. The 401(k) Plan’s amendment further provided that the Company will contribute to the benefit of those associates of the Company hired or rehired after June 30, 2017 and those associates of the Company never enrolled in the Pension Plan an additional basic contribution in an amount equal to 2% of the associate’s eligible compensation beginning January 1, 2018. Participants will vest in the new basic and enhanced Company contributions upon completion of three years of service.  The Company’s 401(k) plan matching expense totaled $ 14.6 million, $8.4 million and $7.7 million for the years ended December 31, 2018, 2017 and 201 6, respectively .  Certain associates who were designated executive officers of Whitney Holding Company and/or Whitney National Bank before the acquisition by the Company are also covered by an unfunded nonqualified defined benefit pension plan. The benefits under this nonqualified plan were designed to supplement amounts to be paid under the defined benefit plan previously maintained for employees of Whitney Holding Company and/or Whitney National Bank (the “Whitney Pension Plan”), and are calculated using the Whitney Pension Plan’s formula, but without applying the restrictions imposed on qualified plans by certain provisions of the Internal Revenue Code. Accrued benefits under this plan were frozen as of December 31, 2012 in connection with the merger of the Whitney Pension Plan into the Company’s qualified defined benefit pension plan, and no future benefits will be accrued under this plan.  The Company also sponsors defined benefit postretirement plans for certain associates. The Hancock postretirement plans are available only to associates hired by the Company prior to January 1, 2000. The Hancock plans provide health care and life insurance benefits to retiring associates who participate in medical and/or group life insurance benefit plans for active associates and have reached 55 years of age with ten years of service, at the time of retirement. The postretirement health care plan is contributory, with retiree contributions adjusted annually and subject to certain employer contribution maximums.  The Whitney postretirement plans are available only to former employees of Whitney Holding Company and/or Whitney National Bank who meet the eligibility requirements, and offer health care and life insurance benefits for eligible retirees and their eligible dependents. Participant contributions are required under the health plan. These plans restrict eligibility for postretirement health benefits to retirees already receiving benefits as of the date of the plan amendments in 2007 and to those active participants who were eligible to receive benefits as of December 31, 2007 (i.e., were age 55 with ten years of credited service). Life insurance benefits are currently only available to associates who retired before December 31, 2007.  The Company assumed certain trends in health care costs in the determination of the benefit obligations. At December 31, 201 8 , the plans assumed a 7.5% increase in health costs for 2018 , declining to 6.75% uniformly over a four year period , and then following the Getzen model thereafter . At December 31, 201 8 , the mortality assumption was based on Revised RP-2014 Employee and Healthy Annuitants Bottom Quartile Generational Mortality Table for Males and Females - Projected with Improvement Scale MP-201 8 . At December 31, 201 7 , the mortality assumption was based on the Revised RP-2014 Employee Health Annuitants Bottom Quartile Table for Males and Females, with projected improvement MP-201 7 .  The following tables detail the changes in the benefit obligations and plan assets of the defined benefit plans for the years ended December 31, 201 8 and 201 7 as well as the funded status of the plans at each year end and the amounts recognized in the Company’s consolidated balance sheets. The Company uses a December 31 measurement date for all defined benefit pension plans and other postretirement benefit plans.     2018 2017 2018 2017  (in thousands) Pension Benefits Other Post- Retirement Benefits  Change in benefit obligation  Benefit obligation:  at beginning of year $ 513,844 $ 479,281 $ 23,036 $ 22,481  Service cost 12,414 15,381 120 129  Interest cost 16,762 16,514 621 668  Plan participants' contributions — — 628 636  Plan amendments — (17,315) — —  Net actuarial gain (loss) (30,796) 39,419 (6,717) 993  Benefits paid (20,207) (19,436) (1,405) (1,871)  Benefit obligation, end of year 492,017 513,844 16,283 23,036  Change in plan assets  Fair value of plan assets:  at beginning of year 564,365 515,555 — —  Actual return on plan assets (40,491) 68,307 — —  Employer contributions 40,138 1,132 777 1,235  Plan participants' contributions — — 628 636  Benefit payments (20,207) (19,436) (1,405) (1,871)  Expenses (1,187) (1,193) — —  Fair value of plan assets, end of year 542,618 564,365 — —  Funded status at end of year - net asset (liability) $ 50,601 $ 50,521 $ (16,283) $ (23,036)  Amounts recognized in accumulated other comprehensive loss  Unrecognized loss:  at beginning of year $ 102,978 $ 115,910 $ (732) $ (2,078)  Net actuarial loss (gain) 46,492 (12,932) (6,283) 1,346  Unrecognized (gain) loss at end of year $ 149,470 $ 102,978 $ (7,015) $ (732)   Projected benefit obligation $ 492,017 $ 513,844  Accumulated benefit obligation 467,300 489,075  Fair value of plan assets 542,618 564,365   The net funded status of $50.6 million for pension benefits plans includes an excess of plan assets over the benefit obligation of $65.1 million on the defined benefit pension plan, offset by an unfunded benefit obligation of $14.5 million for the nonqualified retirement plan.  The following table shows net periodic benefit cost included in expense and the changes in the amounts recognized in AOCI during 201 8 , 201 7 , and 201 6 .      Years Ended December 31,  2018 2017 2016 2018 2017 2016  ($ in thousands) Pension Benefits Other Post-Retirement Benefits  Net periodic benefit cost  Service cost $ 12,414 $ 15,381 $ 14,098 $ 120 $ 129 $ 170  Interest cost 16,762 16,514 16,907 621 668 773  Expected return on plan assets (41,033) (37,632) (34,554) — — —  Amortization of net loss/ prior service cost 5,423 5,554 5,783 (434) (353) 145  Net periodic benefit cost (6,434) (183) 2,234 307 444 1,088  Other changes in plan assets and benefit obligations recognized in other comprehensive income, before taxes  Net (loss) gain recognized during the year (5,423) (5,554) (5,783) 434 353 (145)  Net actuarial loss (gain) 51,915 (7,378) 12,128 (6,717) 993 620  Total recognized in other comprehensive income 46,492 (12,932) 6,345 (6,283) 1,346 475  Total recognized in net periodic benefit cost and other comprehensive income $ 40,058 $ (13,115) $ 8,579 $ (5,976) $ 1,790 $ 1,563   Discount rate for benefit obligations 4.14% 3.57% 4.10% 4.10% 3.52% 3.95%  Discount rate for net periodic benefit cost 3.57% 4.10% 4.40% 3.52% 3.95% 4.32%  Expected long-term return on plan assets 7.25% 7.25% 7.25% n/a n/a n/a  Rate of compensation increase scaled * scaled * scaled * n/a n/a n/a  * Graded scale, declining from 7.00% at age 20 to 2.00% at age 60  The long term rate of return on plan assets is determined by using the weighted-average of historical real returns for major asset classes based on target asset allocations. The discount rates for the benefit obligation were calculated by matching expected future cash flows to the Findley Pension Discount Curve (AA) in 2018 and the BPSM-AA Only Pension Discount Curve in 2017.  The following table presents expected plan benefit payments over the ten years succeeding December 31, 2018:      (in thousands) Pension Post-Retirement Total  2019 $ 21,885 $ 1,036 $ 22,921  2020 23,009 1,037 24,046  2021 24,077 1,098 25,175  2022 25,168 1,030 26,198  2023 26,085 1,029 27,114  2024-2028 148,547 4,958 153,505  $ 268,771 $ 10,188 $ 278,959  The expected benefit payments are estimated based on the same assumptions used to measure the Company’s benefit obligations at December 31, 201 8 .  The estimated amounts of actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next year is $8.9 million.  The following table illustrates the effect on the annual periodic postretirement benefit costs and postretirement benefit obligation of a 1% increase or 1% decrease in the assumed health care cost trend rates from the rates assumed at December 31, 201 8 :      1% Decrease Assumed 1% Increase  (in thousands) in Rates Rates in Rates  Aggregated service and interest cost $ 666 $ 741 $ 834  Postretirement benefit obligation 14,949 16,281 17,894  The fair values of pension plan assets at December 31, 201 8 and 201 7 , by asset category, are shown in the following tables. The fair value is presented based on the Financial Accounting Standards Board’s fair value hierarchy that prioritizes inputs into the valuation techniques used to measure fair value. Level 1 uses quoted prices in active markets for identical assets, Level 2 uses significant observable inputs, and Level 3 uses significant unobservable inputs. In accordance with Subtopic 820-10 common trust funds are reported at fair value using net asset value per share (or its equivalent) as a practical expedient and are not classified in the fair value hierarchy.  For all investments, the plan attempts to use quoted market prices of identical assets on active exchanges, or Level 1 measurements. Where such quoted market prices are not available, the plan will use quoted prices for similar instruments or discounted cash flows to estimate the value, reported as Level 2.      December 31, 2018  Fair Value Measurements by Asset Category / Fund Level 1 Level 2 Level 3 Total  (in thousands)  Cash and equivalents $ 8,643 $ — $ — $ 8,643  Total cash and cash equivalents 8,643 — — 8,643   Fixed income securities 19,856 97,025 — 116,881  Mutual fund-fixed income 31,556 — 145 31,701  Total fixed income 51,412 97,025 145 148,582   Domestic and foreign stock 80,813 6 — 80,819  Mutual funds-equity 150,466 — — 150,466  Total equity 231,279 6 — 231,285  Total assets at fair value 291,334 97,031 145 388,510  Common trust funds (fixed income) — — — 125,706  Common trust fund (real assets) — — — 28,402  Total $ 291,334 $ 97,031 $ 145 $ 542,619      December 31, 2017  Fair Value Measurements by Asset Category / Fund Level 1 Level 2 Level 3 Total  (in thousands)  Cash and equivalents $ 5,496 $ — $ — $ 5,496  Total cash and cash equivalents 5,496 — — 5,496   Fixed income securities — 113,169 162 113,331  Mutual fund-fixed income 31,839 — — 31,839  Total fixed income 31,839 113,169 162 145,170   Domestic and foreign stock 102,416 6 — 102,422  Mutual funds-equity 168,299 — — 168,299  Total equity 270,715 6 — 270,721  Total assets at fair value 308,050 113,175 162 421,387  Common trust funds (fixed income) — — — 114,068  Common trust fund (real assets) — — — 28,910  Total $ 308,050 $ 113,175 $ — $ 564,365   The following table presents the percentage allocation of the plan assets by asset category and corresponding target allocations at December 31, 2018 and 2017.    Plan Assets Target Allocation  at December 31, at December 31,  Asset category 2018 2017 2018 2017  Cash and equivalents 1 % 1 % 0 - 5% 0 - 5%  Fixed income securities 51 46 35 - 63% 35 - 63%  Equity securities 43 48 35 - 51% 35 - 51%  Real assets 5 5 0 - 12% 0 - 12%  100 % 100 %  Plan assets are invested in long-term strategies and evaluated within the context of a long-term investment horizon. Plan assets will be diversified across multiple asset classes so as to minimize the risk of large losses. Short-term fluctuations in value will be considered secondary to long-term results. The Company employs a total return approach whereby a diversified mix of asset class investments are used to maximize the long-term return of plan assets for an acceptable level of risk. Risk tolerance is established through careful consideration of the plan liabilities, plan funded status and the Company’s financial condition. The investment performance of the plan is regularly monitored to ensure that appropriate risk levels are being taken and to evaluate returns versus a suitable market benchmark. The benefits investment committee meets periodically to review the policy, strategy, and performance of the plans.

Share-Based Payment Arrangement

Share-Based Payment Arrangements	12 Months Ended
	Dec. 31, 2018
Share-Based Payment Arrangements [Abstract]
Share-Based Payment Arrangements	Note 17 . Share-Based Payment Arrangements  The Company maintains incentive compensation plans that incorporate share-based payment arrangements for associates and directors. The current plan under which share-based awards may be granted, the 2014 Long Term Incentive Plan (the “2014 Plan”), was approved by the Company’s stockholders at the 2014 annual meeting as a successor to the Company’s 2005 Long-Term Incentive Plan (the “2005 Plan”). Certain share-based awards remain outstanding under the 2005 Plan and prior equity incentive compensation plans, but no future awards may be granted thereunder.  The Compensation Committee of the Company’s Board of Directors administers the equity incentive plans, makes determinations with respect to participation by employees or directors and authorizes the share-based awards. Under the 2014 Plan, participants may be awarded stock options (including incentive stock options for associates), restricted shares, performance stock awards and stock appreciation rights, all on a stand-alone, combination or tandem basis. To date, the Committee has awarded stock options, tenure-based restricted shares and performance stock awards under the 2014 Plan and the prior equity incentive plans.  During the year ended December 31, 2017, the Company’s shareholders approved a 1,200,000 increase in the aggregate number of awards that may be granted under the 2014 Plan . Future awards may be granted for the issuance of an aggregate of 2,996,357 shares of the Company’s common stock, plus the number of any shares of the Company’s common stock for which awards under the 2005 Plan are cancelled, expired, forfeited or settled in cash. The 2014 Plan limits the number of shares for which awards may be granted to any participant during any calendar year to 100,000 shares. The Company may use authorized unissued shares or shares held in treasury to satisfy awards under the 2014 Plan.  As of December 31, 201 8 there were 1. 1 million shares available for future issuance under the 2014 equity compensation plan.  For the years ended December 31, 201 8 , 201 7 and 201 6, total share-based compensation recognized in income was $1 9.8 million , $17 .6 million and $14 .3 million, respectively. The total recognized tax benefit related to the share-based compensation was $ 5.8 million, $ 13.3 million and $5.2 million for 201 8 , 201 7 and 201 6 , respectively.  A summary of stock option activity for 201 8 is presented below:      Options Number of Shares Weighted- Average Exercise Price ($) Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value ($000)  Outstanding at January 1, 2018 88,301 $ 34.84 2.8 $ 1,294  Exercised (35,317) 37.39 592  Expired (6,119) 42.82 10  Outstanding at December 31, 2018 46,865 $ 31.88 2.6 $ 164  Exercisable at December 31, 2018 46,685 $ 31.88 2.6 $ 164  The exercise price for stock options is set at the closing market price of the Company’s stock on the date immediately preceding the date of grant, except for the exercise price of certain options granted to major stockholders which is set at 110% of the market price. Option awards generally vest equally over five years of continuous service and have ten - year contractual terms.  The total intrinsic value of options exercised during 201 8 was $ 0.6 million. The total intrinsic value of options exercised during 201 7 and 201 6 was $4.3 million, and $0.5 million, respectively.  A summary of the Company’s nonvested restricted and performance shares for the year ended December 31, 201 8 is presented below:     Number of Shares Weighted- Average Grant-Date Fair Value ($)  Nonvested at January 1, 2018 1,708,942 $ 37.05  Granted 647,376 39.70  Vested (792,084) 33.94  Cancelled/Forfeited (70,193) 36.13  Nonvested at December 31, 2018 1,494,041 $ 39.89  As of December 31, 201 8 , there was $ 54.3 million of total unrecognized compensation expense related to nonvested restricted and performance shares expected to vest. This compensation is expected to be recognized in expense over a weighted-average period of 3. 5 years. The total fair value of shares which vested during 201 8 and 2017 was $ 26.2 million and $ 26.3 million, respectively.  In 2018 , the Company granted 2 6,147 performance shares subject to a total shareholder return (“TSR”) performance metric with a grant date fair value of $51.13 per share and 2 6,147 performance shares subject to a core earnings per share performance metric with a grant date fair value of $ 44.84 per share to key members of executive management. The number of performance shares subject to TSR that ultimately vest at the end of the three -year performance period, if any, will be based on the relative rank of the Company’s three-year TSR among the TSRs of a peer group of 43 regional banks. The fair value of the performance shares subject to TSR at the grant date was determined using a Monte Carlo simulated method. The number of performance shares subject to core earnings per share that ultimately vest will be based on the Company’s attainment of certain core earnings per share goals over the two -year performance period. The maximum number of performance shares that could vest is 200% of the target award. Compensation expense for these performance shares will be recognized on a straight-line basis over the three -year service period.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Note 18. Commitments and Contingencies  Credit Related  In the normal course of business, the Bank enters into financial instruments, such as commitments to extend credit and letters of credit, to meet the financing needs of its customers. Such instruments are not reflected in the accompanying consolidated financial statements until they are funded, although they expose the Bank to varying degrees of credit risk and interest rate risk in much the same way as funded loans.  Commitments to extend credit include revolving commercial credit lines, nonrevolving loan commitments issued mainly to finance the acquisition and development or construction of real property or equipment, and credit card and personal credit lines. The availability of funds under commercial credit lines and loan commitments generally depends on whether the borrower continues to meet credit standards established in the underlying contract and has not violated other contractual conditions. Loan commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee by the borrower. Credit card and personal credit lines are generally subject to cancellation if the borrower’s credit quality deteriorates. A number of commercial and personal credit lines are used only partially or, in some cases, not at all before they expire, and the total commitment amounts do not necessarily represent future cash requirements of the Company.  A substantial majority of the letters of credit are standby agreements that obligate the Bank to fulfill a customer’s financial commitments to a third party if the customer is unable to perform. The Bank issues standby letters of credit primarily to provide credit enhancement to its customers’ other commercial or public financing arrangements and to help them demonstrate financial capacity to vendors of essential goods and services.  The contract amounts of these instruments reflect the Company’s exposure to credit risk. The Company undertakes the same credit evaluation in making loan commitments and assuming conditional obligations as it does for on-balance sheet instruments and may require collateral or other credit support. These off-balance sheet financial instruments are summarized below:      December 31,  (in thousands) 2018 2017  Commitments to extend credit $ 7,234,528 $ 6,689,033  Letters of credit 365,498 348,377  Legal Proceedings  The Company is party to various legal proceedings arising in the ordinary course of business. Management does not believe that loss contingencies, if any, arising from pending litigation and regulatory matters will have a material adverse effect on the consolidated financial position or liquidity of the Company.  Lease Commitments  The Company currently is obligated under a number of non-cancelable operating leases for buildings and equipment. Certain of these leases have escalation clauses and renewal options. Future minimum lease payments for non-cancelable operating leases with initial terms in excess of one year were as follows at December 31, 201 8 :      (in thousands) Operating Leases  2019 $ 18,476  2020 17,059  2021 15,780  2022 15,506  2023 14,373  Thereafter 101,402  Total minimum lease payments $ 182,596  Rental expense approxim ated $18.2 million, $ 17.0 million and $ 11.7 million for the y ears ended December 31, 201 8 , 201 7 , and 201 6 , respectively.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2018
Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments	Note 19. Fair Value of Financial Instruments  The FASB defines fair value as the exchange price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The FASB’s guidance also establishes a fair value hierarchy that prioritizes the inputs to these valuation techniques used to measure fair value, giving preference to quoted prices in active markets for identical assets or liabilities (level 1) and the lowest priority to unobservable inputs such as a reporting entity’s own data (level 3). Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in markets that are not active, observable inputs other than quoted prices, such as interest rates and yield curves, and inputs that are derived principally from or corroborated by observable market data by correlation or other means.  Fair Value of Assets Measured on a Recurring Basis  The following tables present for each of the fair value hierarchy levels the Company’s financial assets and liabilities that are measured at fair value on a recurring basis in the consolidated balance sheets.      December 31, 2018  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 71,706 $ — $ 71,706  Municipal obligations — 240,427 — 240,427  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,443,402 — 1,443,402  Commercial mortgage-backed securities — 770,077 — 770,077  Collateralized mortgage obligations — 161,925 — 161,925  Total available for sale securities — 2,691,037 — 2,691,037  Derivative assets (1) — 16,980 — 16,980  Total recurring fair value measurements - assets $ — $ 2,708,017 $ — $ 2,708,017  Liabilities — —  Derivative liabilities (1) $ — $ 14,923 $ 7,304 $ 22,227  Total recurring fair value measurements - liabilities $ — $ 14,923 $ 7,304 $ 22,227  (1) For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.      December 31, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 97,272 $ — $ 97,272  Municipal obligations — 243,786 — 243,786  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,715,213 — 1,715,213  Commercial mortgage-backed securities — 687,135 — 687,135  Collateralized mortgage obligations — 163,963 — 163,963  Total available for sale securities — 2,910,869 — 2,910,869  Derivative assets (1) — 14,157 — 14,157  Total recurring fair value measurements - assets $ — 2,925,026 $ — 2,925,026  Liabilities —  Derivative liabilities (1) $ — $ 14,389 $ — $ 14,389  Total recurring fair value measurements - liabilities $ — $ 14,389 $ — $ 14,389  (1) For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.  The fair value measurements for investment securities are obtained quarterly from a third-party pricing service that uses industry-standard pricing models. Substantially all of the model inputs are observable in the marketplace or can be supported by observable data. The Company invests only in securities of investment grade quality with a targeted duration, for the overall portfolio, generally between two and five years . Company policies generally limit investments to agency securities and municipal securities determined to be investment grade according to an internally generated score which generally includes a rating of not less than “Baa” or its equivalent by a nationally recognized statistical rating agency.  For the Company’s derivative financial instruments designated as hedges and those under the customer interest rate program, the fair value is obtained from a third-party pricing service that uses an industry-standard discounted cash flow model that relies on inputs, LIBOR swap curves, Overnight Index swap rate curves, observable in the marketplace. To comply with the accounting guidance, credit valuation adjustments are incorporated in the fair values to appropriately reflect nonperformance risk for both the Company and the counterparties. Although the Company has determined that the majority of the inputs used to value these derivative instruments fall within level 2 of the fair value hierarchy, the credit value adjustments utilize level 3 inputs, such as estimates of current credit spreads. The Company has determined that the impact of the credit valuation adjustments is not significant to the overall valuation of these derivatives. As a result, the Company has classified its derivative valuations for these instruments in level 2 of the fair value hierarchy. The Company’s policy is to measure counterparty credit risk quarterly for all derivative instruments subject to master netting arrangements consistent with how market participants would price the net risk exposure at the measurement date.  The Company also has certain derivative instruments associated with the Bank’s mortgage-banking activities. These derivative instruments include interest rate lock commitments on prospective residential mortgage loans and forward commitments to sell these loans to investors on a best efforts delivery basis. The fair value of these derivative instruments is measured using observable market prices for similar instruments and is classified as a level 2 measurement.  The Company’s Level 3 liability consists of a derivative contract with the purchaser of 192,163 shares of Visa Class B common stock. Pursuant to the agreement, the Company retains the risks associated with the ultimate conversion of the Visa Class B common shares into shares of Visa Inc. Class A common stock, such that the counterparty will be compensated for any dilutive adjustments to the conversion ratio and the Company will be compensated for any anti-dilutive adjustments to the ratio. The agreement also requires periodic payments by the Company to the counterparty calculated by reference to the market price of Visa Class A common shares at the time of sale and a fixed rate of interest that steps up once after the eighth scheduled quarterly payment. The fair value of the liability is determined using a discounted cash flow methodology. The significant unobservable inputs used in the fair value measurement are the Company’s own assumptions about estimated changes in the conversion rate of the Visa Class B common shares into Visa Class A common shares, the date on which such conversion is expected to occur and the estimated growth rate of the Visa Class A common share price. Refer to Note 10 – Derivatives f or information about the derivative contract with the counterparty.  The Company believes its valuation methods for its assets and liabilities carried at fair value are appropriate; however, the use of different methodologies or assumptions, particularly as applied to Level 3 assets and liabilities, could have a material effect on the computation of their estimated fair values.  Changes in Level 3 Fair Value Measurements and Quantitative Information about Level 3 Fair Value Measurements  The table below presents a rollforward of the amounts on the consolidated balance sheet for the year ended December 31, 2018 for financial instruments of a material nature that are classified within Level 3 of the fair value hierarchy and are measured at fair value on a recurring basis :  (in thousands)    Beginning balance $ -  Entry into derivative contract 7,304  Ending balance $ 7,304  The table below provides an overview of the valuation techniques and significant unobservable inputs used in those techniques to measure the financial instrument measured on a recurring basis and classified within Level 3 of the valuation. The range of sensitivities that management utilized in its fair value calculations is deemed acceptable in the industry with respect to the identified financial instrument.  (in thousands)    Level 3 Class Fair Value at December 31, 2018 Valuation Technique Unobservable Input Values Utilized  VISA Class A Appreciation 6.0% - 18.0%  Other derivative liability $ 7,304 Discounted cash flow Conversion rate 1.62x - 1.59x  Time until resolution 24 - 48 months  The Company’s policy is to recognize transfers between valuation hierarchy levels as of the end of a reporting period. There were no transfers between levels during the periods presented.  Fair Value of Assets Measured on a Nonrecurring Basis  Certain assets and liabilities are measured at fair value on a nonrecurring basis. Collateral-dependent impaired loans are level 2 assets measured at the fair value of the underlying collateral based on independent third-party appraisals that take into consideration market-based information such as recent sales activity for similar assets in the property’s market.  Other real estate owned, including both foreclosed property and surplus banking property, are level 3 assets that are adjusted to fair value, less estimated selling costs, upon transfer to other real estate owned. Subsequently, other real estate owned is carried at the lower of carrying value or fair value less estimated selling costs. Fair values are determined by sales agreement or third-party appraisals as discounted for estimated selling costs, information from comparable sales, and marketability of the property.  The following table presents for each of the fair value hierarchy levels the Company’s financial assets that are measured at fair value on a nonrecurring basis:      December 31, 2018  (in thousands) Level 1 Level 2 Level 3 Total  Collateral dependent impaired loans $ — $ 170,918 $ — $ 170,918  Other real estate and foreclosed assets, net — — 14,594 14,594  Total nonrecurring fair value measurements $ — $ 170,918 $ 14,594 $ 185,512      December 31, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Collateral dependent impaired loans $ — $ 184,205 $ — $ 184,205  Other real estate and foreclosed assets, net — — 19,608 19,608  Total nonrecurring fair value measurements $ — $ 184,205 $ 19,608 $ 203,813  Accounting guidance from the FASB requires the disclosure of estimated fair value information about certain on- and off-balance sheet financial instruments, including those financial instruments that are not measured and reported at fair value on a recurring basis. The significant methods and assumptions used by the Company to estimate the fair value of financial instruments are discussed below.  Cash, Short-Term Investments and Federal Funds Sold – For those short-term instruments, the carrying amount is a reasonable estimate of fair value.  Securities – The fair value measurement for securities available for sale was discussed earlier in the note. The same measurement techniques were applied to the valuation of securities held to maturity.  Loans, Net – The fair value measurement for certain impaired loans was discussed earlier in the note. For the remaining portfolio, fair values were generally determined by discounting scheduled cash flows using discount rates determined with reference to current market rates at which loans with similar terms would be made to borrowers with similar credit quality.  Loans Held For Sale – These loans are recorded at fair value and carried at the lower of cost or market. The carrying amount is considered a reasonable estimate of fair value.  Deposits – The accounting guidance requires that the fair value of deposits with no stated maturity, such as noninterest-bearing demand deposits and interest-bearing checking and savings accounts, be assigned fair values equal to amounts payable upon demand (carrying amounts). The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities.  Securities Sold under Agreements to Repurchase, Federal Funds Purchased and Short-Term FHLB Borrowings – For these short-term liabilities, the carrying amount is a reasonable estimate of fair value.  Long-Term Debt – The fair value is estimated by discounting the future contractual cash flows using current market rates at which debt with similar terms could be obtained.  Derivative Financial Instruments – The fair value measurements for derivative financial instruments were discussed earlier in the note.  The following tables present the estimated fair values of the Company’s financial instruments by fair value hierarchy levels and the corresponding carrying amount at December 31, 201 8 and 201 7 .      December 31, 2018  Total Carrying  (in thousands) Level 1 Level 2 Level 3 Fair Value Amount  Financial assets:  Cash, interest-bearing bank  deposits, and federal funds sold $ 494,466 $ — $ — $ 494,466 $ 494,466  Available for sale securities — 2,691,037 — 2,691,037 2,691,037  Held to maturity securities — 2,935,856 — 2,935,856 2,979,547  Loans, net — 170,918 19,555,969 19,726,887 19,831,897  Loans held for sale — 28,150 — 28,150 28,150  Derivative financial instruments — 16,980 — 16,980 16,980  Financial liabilities:  Deposits $ — $ — $ 23,129,574 $ 23,129,574 $ 23,150,185  Federal funds purchased 425 — — 425 425  Securities sold under agreements  to repurchase 428,599 — — 428,599 428,599  Short-term FHLB Borrowings 1,160,104 — — 1,160,104 1,160,104  Long-term debt — 223,135 — 223,135 224,993  Derivative financial instruments — 14,923 7,304 22,227 22,227                    December 31, 2017  Total Carrying  (in thousands) Level 1 Level 2 Level 3 Fair Value Amount  Financial assets:  Cash, interest-bearing bank  deposits, and federal funds sold $ 479,332 $ — $ — $ 479,332 $ 479,332  Available for sale securities — 2,910,869 — 2,910,869 2,910,869  Held to maturity securities — 2,962,010 — 2,962,010 2,977,511  Loans, net — 184,205 18,403,303 18,587,508 18,786,855  Loans held for sale — 39,865 — 39,865 39,865  Derivative financial instruments — 14,157 — 14,157 14,157  Financial liabilities:  Deposits $ — $ — $ 22,238,847 $ 22,238,847 $ 22,253,202  Federal funds purchased 140,754 — — 140,754 140,754  Securities sold under agreements  to repurchase 430,569 — — 430,569 430,569  FHLB Borrowings 1,132,567 — — 1,132,567 1,132,567  Long-term debt — 303,631 — 303,631 305,513  Derivative financial instruments — 14,389 — 14,389 14,389

Condensed Parent Company Inform

Condensed Parent Company Information	12 Months Ended
	Dec. 31, 2018
Condensed Parent Company Information [Abstract]
Condensed Parent Company Information	Note 20. Condensed Parent Company Information  The following condensed financial statements reflect the accounts and transactions of Hancock Whitney Corporation only:  Condensed Balance Sheets      December 31,  (in thousands) 2018 2017  Assets:  Cash $ 153,939 $ 71,328  Securities available for sale — 58,521  Investment in bank subsidiaries 3,040,186 2,953,032  Investment in non-bank subsidiaries 26,274 22,670  Due from subsidiaries and other assets 6,868 14,010  $ 3,227,267 $ 3,119,561  Liabilities and Stockholders' Equity:  Long term debt $ 145,396 $ 234,135  Other liabilities 531 477  Stockholders' equity 3,081,340 2,884,949  $ 3,227,267 $ 3,119,561  Condensed Statements of Income      Years Ended December 31,  (in thousands) 2018 2017 2016  Operating Income  From subsidiaries  Cash dividends received from bank subsidiaries $ 200,000 $ 90,000 $ 120,000  Noncash dividend from bank subsidiaries — 11,708 —  Equity in earnings of subsidiaries greater than  dividends received 137,914 124,531 39,293  Total operating income 337,914 226,239 159,293  Other expense, net (18,728) (16,931) (16,614)  Income tax benefit (4,584) (6,324) (6,617)  Net income $ 323,770 $ 215,632 $ 149,296  Other comprehensive income (loss), net of tax (46,307) 11,460 (39,937)  Comprehensive income $ 277,463 $ 227,092 $ 109,359  Condensed Statements of Cash Flows      Years Ended December 31,  (in thousands) 2018 2017 2016  Cash flows from operating activities - principally  dividends received from subsidiaries $ 216,270 $ 111,591 $ 122,528  Net cash provided by operating activities 216,270 111,591 122,528  Cash flows from investing activities  Contribution of capital to subsidiary — (270,000) (21,000)  Proceeds from sale of securities available for sale 47,557 — —  Proceeds from principal paydowns of securities available for sale 9,091 11,015 13,827  Net cash provided by (used in) investing activities 56,648 (258,985) (7,173)  Cash flows from financing activities:  Repayment of long term debt (89,200) (17,900) (17,900)  Dividends paid to stockholders (88,838) (83,266) (77,012)  Repurchase of common stock (8,267) — —  Proceeds from issuance of common stock 4,693 15,312 262,961  Payroll tax remitted on net share settlement of equity awards (8,695) (11,881) (3,178)  Other, net — — (133)  Net cash provided by (used in) financing activities (190,307) (97,735) 164,738  Net increase (decrease) in cash 82,611 (245,129) 280,093  Cash, beginning of year 71,328 316,457 36,364  Cash, end of year $ 153,939 $ 71,328 $ 316,457

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Event [Abstract]
Subsequent Event	Note 21. Subsequent Event  The Company has a lease financing facility to a borrower, DC Solar, that sold and managed mobile solar generators . The borrower filed for Chapter 11 bankruptcy protection in February 2019. Also in February 2019, the Company became aware of an affidavit from a Federal Bureau of Investigation special agent that alleged this borrower was operating a potentially fraudulent Ponzi-type scheme and that the majority of mobile solar generators sold to investors and managed by the borrower and the majority of the related lease revenues claimed to have been received by the borrower may not have existed. The Company has potential loss exposure of up to $11 million that could result in a charge to the allowance for loan and lease loss es . 

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Policies)	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies and Recent Accounting Pronouncements [Abstract]
Basis of Presentation	Basis of Presentation  The consolidated financial statements include the accounts of the Company and all other entities in which the Company has a controlling interest. Significant intercompany transactions and balances have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation. 
Use of Estimates	Use of Estimates  The accounting principles the Company follows and the methods for applying these principles conform to U.S. GAAP and general practices followed by the banking industry. These accounting principles and practices require management to make estimates and assumptions about future events that affect the amounts reported in the consolidated financial statements and the accompanying notes. Actual results could differ from those estimates.
Fair Value Accounting	Fair Value Accounting  U.S. GAAP requires the use of fair values in determining the carrying values of certain assets and liabilities in the financial statements, as well as for specific disclosures about certain assets and liabilities.  Accounting guidance establishes a fair value hierarchy that prioritizes the inputs to these valuation techniques used to measure fair value giving preference to quoted prices in active markets (level 1) and the lowest priority to unobservable inputs such as a reporting entity’s own data or information or assumptions developed from this data (level 3). Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in markets that are not active, observable inputs other than quoted prices, such as interest rates and yield curves, and inputs that are derived principally from or corroborated by observable market data by correlation or other means.
Business Combinations	Business Combinations  Business combinations are accounted for under the purchase method of accounting. Purchased assets, including identifiable intangibles, and assumed liabilities are recorded at their respective acquisition date fair values. If the fair value of net assets purchased exceeds the consideration given, a bargain purchase gain is recognized. If the consideration given exceeds the fair value of the net assets received or if the fair value of the net liabilities assumed exceeds the consideration received, goodwill is recognized. Fair values are subject to refinement for up to one year after the closing date of an acquisition as information relative to closing date fair values becomes available. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date with no carryover of the related allowance for loan losses.  All identifiable intangible assets that are acquired in a business combination are recognized at the acquisition date fair value. Identifiable intangible assets are recognized separately if they arise from contractual or other legal rights or if they are separable (i.e., capable of being sold, transferred, licensed, rented, or exchanged separately from the entity).
Cash and Due from Banks	Cash and Due from Banks  The Company considers only cash on hand, cash items in process of collection and balances due from financial institutions as cash and cash equivalents.
Securities	Securities  Securities are classified as trading, held to maturity or available for sale. Management determines the appropriate classification of debt and equity securities at the time of purchase and reevaluates this classification periodically as conditions change that could require reclassification.  Available for sale securities are stated at fair value. Unrealized holding gains and unrealized holding losses, other than those determined to be other than temporary, are reported net of tax in other comprehensive income and in accumulated other comprehensive income (“AOCI”) until realized.  Securities that the Company both positively intends and has the ability to hold to maturity are classified as securities held to maturity and are carried at amortized cost. The intent and ability to hold are not considered satisfied when a security is available to be sold in response to changes in interest rates, prepayment rates, liquidity needs or other reasons as part of an overall asset/liability management strategy.  Premiums and discounts on securities, both those held to maturity and those available for sale, are amortized and accreted to income as an adjustment to the securities’ yields using the effective interest method. Realized gains and losses on securities, including declines in value judged to be other than temporary, are reported net as a component of noninterest income. The cost of securities sold is specifically identified for use in calculating realized gains and losses.
Loans	Loans  Loans held for investment  Loans that the Company has the intent and ability to hold for the foreseeable future or until maturity or payoff are considered loans held for investment and reported as “Loans” in the Consolidated Balance Sheets and in the related footnote disclosures. Loans held for investment include loans originated for investment and loans acquired in purchase transactions.  Originated loans are reported at the principal balance outstanding net of unearned income. Interest on loans and accretion of unearned income, including net deferred loan fees and costs, are computed in a manner that approximates a level yield on recorded principal. Interest on loans is recognized in income as earned.  The accrual of interest on an originated loan is discontinued (“nonaccrual status”) when, in management’s opinion, it is probable that the borrower will be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. When accrual of interest is discontinued on a loan, all unpaid accrued interest is reversed and payments subsequently received are applied first to recover principal. Interest income is recognized for payments received after contractual principal has been satisfied. Loans are returned to accrual status when all the principal and interest contractually due are brought current and future payment performance is reasonably assured.  Loans that are acquired in purchase transactions are recorded at estimated fair value at the acquisition date with no carryover of the related allowance for loan losses. Acquired loans are segregated between those considered to be performing (“purchased credit performing”) and those with evidence of credit deterioration (“purchased credit impaired”) based on such factors as past due status, nonaccrual status and credit risk ratings (rated substandard or worse). Purchased credit performing loans are accounted for under Accounting Standards Codification (ASC) 310-20 and purchased credit impaired loans are accounted for under ASC 310-30. Purchased credit impaired loans for which the timing and amount of future cash flows cannot be reasonably projected are accounted for using the cost recovery method.  With the exception of those accounted for using the cost recovery method, the acquired loans are further segregated into loan pools designed to facilitate the development of expected cash flows to be used in estimating fair value. The pools are based on common risk characteristics such as market area, loan type, credit risk ratings, contractual interest rate, and repayment terms. Loan types can include commercial and industrial loans not secured by real estate, construction and land development loans, commercial real estate loans, residential mortgage loans, and consumer loans, with further segregation within certain loan types as needed. Expected cash flows, both principal and interest, from each pool are estimated based on key assumptions covering such factors as prepayments, default rates, and severity of loss given a default. These assumptions are developed using both historical experience and the portfolio characteristics at acquisition as well as available market research. The fair value estimate for each pool is based on the estimate of expected cash flows from the pool discounted at prevailing market rates.  The difference at the acquisition date between the fair value and the contractual amounts due for each purchased credit performing loan pool (the “fair value discount”) is accreted into income over the estimated life of the pool. Purchased credit performing loans are placed on nonaccrual status and reported as nonperforming or past due using the same criteria applied to the originated portfolio.  The excess of estimated cash flows expected to be collected from each purchased credit impaired loan pool over the pool’s carrying value is referred to as the accretable yield and is recognized in interest income using an effective yield method over the expected life of the pool. Each pool of purchased credit impaired loans is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Purchased credit impaired loans in pools with an accretable yield and expected cash flows that are reasonably estimable are considered to be accruing and performing even though collection of contractual payments on loans within the pool may be in doubt. Purchased credit impaired loans accounted for in pools are generally not subject to individual evaluation for impairment and are not reported with impaired loans or troubled debt restructurings even if they would otherwise qualify for such treatment.  Loans Held for Sale  Residential mortgage loans originated for sale are classified as loans held for sale and carried at the lower of cost or market. Forward sales commitments on a best-efforts basis are entered into with third parties concurrently with rate lock commitments made to prospective borrowers. At times, management may decide to sell loans that were not originated for that purpose. Those loans are reclassified as held for sale when that decision is made and also carried at the lower of cost or market.  Impaired Loans  The Company considers a loan to be impaired when, based upon current information and events, it believes it is probable all amounts due according to the contractual terms of the loans agreement will not be collected. A loan is not considered impaired due to a delay in payment if all amounts due, including interest accrued at the contractual interest rate of the period of delay, is expected to be collected. Impaired loans include loans on nonaccrual, certain purchased credit impaired loans accounted for using the cost recovery method, and loans modified in troubled debt restructurings (defined below), both accruing and nonaccrual statuses. Purchased credit impaired loans accounted for in pools with an accretable yield are considered performing and excluded from impaired loans as this accounting methodology takes into consideration expected future credit losses.  Troubled Debt Restructurings  Troubled debt restructurings (TDRs) occur when a borrower is experiencing, or is expected to experience, financial difficulties in the near-term and a modification in loan terms is granted that would otherwise not have been considered.  Troubled debt restructurings can result in loans remaining on nonaccrual, moving to nonaccrual, or continuing to accrue, depending on the individual facts and circumstances of the borrower. All loans whose terms have been modified in a TDR, including both commercial and retail loans, are reported as “impaired.” When measuring impairment on a TDR, the loan’s value is determined by either the present value of expected cash flows calculated using the loan’s effective interest rate before the restructuring, or the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. If the value as determined is less than the recorded investment in the loan, the difference is charged off through the allowance for loan and lease losses. Modified acquired-impaired loans are not removed from their accounting pool and accounted for as a TDR even if those loans would otherwise be deemed TDRs. 
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses  The Allowance for Loan and Lease Losses (ALLL) is a valuation account available to absorb losses on loans. The ALLL is established and maintained at an amount sufficient to cover estimated credit losses inherent in the loan and lease portfolios of the Company as of the date of the determination. Credit losses arise not only from credit risk, but also from other risks inherent in the lending process including, but not limited to, collateral risk, operational risk, concentration risk, and economic risk. As such, all related risks of lending are considered when assessing the adequacy of the allowance for loan and lease losses. Quarterly, management estimates inherent losses in the portfolio based on a number of factors, including the Company’s past loan loss and delinquency experience, known and inherent risks in the portfolio, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.  The analysis and methodology for estimating the ALLL include two primary elements: A loss rate analysis, which incorporates a historical loss rate as updated for current conditions, is used for loans collectively evaluated for impairment; and a specific reserve analysis is used for loans individually evaluated for impairment. For the loss rate analysis, the Company segments loans into commercial non-real estate, commercial real estate – owner occupied, commercial real estate – income producing, construction and land development, residential mortgage and consumer, with further segmentation as deemed appropriate. Both quantitative and qualitative factors are applied at the detailed portfolio segments. Commercial loans (commercial non-real estate, commercial real estate – owner occupied, commercial real estate – income producing and construction and land development), are further subdivided by risk rating, while retail loans (residential mortgage and consumer) are further subdivided by delinquency. The Company uses loss emergence periods developed based on historical experience, which is currently 24 months for commercial loans and twelve to eighteen months for retail and residential mortgage loans. Historical loss rates are calculated using a weighted average of the loss emergence periods in the historical look back period. As circumstances dictate, management will make adjustments to the overall loss rate to reflect differences in current conditions as compared to those during the historical loss period. Conditions to be considered include problem loan trends, current business and economic conditions, credit concentrations, lending policies and procedures, lending staff, collateral values, loan profiles and volumes, loan review quality, and changes in competition and regulations.  When a loan is determined to be impaired, the amount of impairment is recognized by creating a specific allowance for any shortfall between the loan’s value and its recorded investment. The loan’s value is measured by either the loan’s observable market price, the fair value of the collateral of the loan (less liquidation costs) if it is collateral dependent, or by the present value of expected future cash flows discounted at the loan’s effective interest rate. Loans individually analyzed for impairment are not incorporated into the pool analysis to avoid double counting. The Company limits the specific reserve analysis to include all impaired commercial and residential mortgage loans with relationship balances of $1 million or greater and all loans classified as troubled debt restructurings.  The monitoring of credit risk also extends to unfunded credit commitments, such as unused commercial credit lines and letters of credit, and management establishes reserves as needed for its estimate of probable losses on such commitments.  It is the policy of the Company to promptly charge off all commercial and residential mortgage loans, or portions of loans, when available information reasonably confirms that they are wholly or partially uncollectible. Prior to recognizing a loss, asset value is established based on an assessment of the value of the collateral securing the loan, the borrower’s and the guarantor’s ability and willingness to pay and the status of the account in bankruptcy court, if applicable. Consumer loans are generally charged down when the loan is 90 days past due for unsecured loans or 120 days past due for secured loans, unless the loan is clearly both well secured and in the process of collection. Loans are charged down to the fair value of the collateral, if any, less estimated selling costs. Loans are charged off against the allowance for loan losses with subsequent recoveries added back to the allowance.  Allowance for purchased credit performing loans is evaluated at each reporting date subsequent to acquisition. An allowance is determined for each loan pool using a methodology similar to that described above for originated loans and then compared to the remaining fair value discount for that pool. If the allowance is greater than the discount, the excess is recognized as an addition to the allowance through a provision for loan losses. If the allowance is less than the discount, no additional allowance is recognized.  For purchased credit impaired loans accounted for in pools, estimated cash flows expected to be collected are recast at each reporting date for each loan pool that is material individually or in the aggregate. These evaluations require the continued use and updating of key assumptions and estimates such as default rates, loss severity given default and prepayment speed assumptions, similar to those used for the initial fair value estimate. Management’s judgment must be applied in developing these assumptions. If the present value of expected cash flows for a pool is less than its carrying value, impairment is recognized by an increase in the allowance for loan losses and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established allowance for loan losses is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. 
Property and Equipment	Property and Equipment  Property and equipment are recorded at cost, less accumulated depreciation and amortization. Depreciation is charged to expense using the straight-line method over the estimated useful lives of the assets, which are up to 3 0 years for buildings and three to ten years for most furniture and equipment. Amortization expense for software is generally charged over three years, or seven years for core systems. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. The Company evaluates whether events and circumstances have occurred that indicate that such long-lived assets have been impaired. Measurement of any impairment of such long-lived assets is based on their fair values.  Property and equipment used in operations is considered held for sale when certain criteria are met, including when management has committed to a plan to sell the asset, the asset is available for sale in its immediate condition, and the sale is probable within one year of the reporting date. Assets held for sale are reported at the lower of cost or fair value less costs to sell. Gains and losses related to retirement or disposition of property and equipment are recorded in other income under noninterest income on the consolidated statements of income as realized. 
Other Real Estate and Foreclosed Assets	 Other Real Estate and Foreclosed Assets  Other real estate and foreclosed assets includes real property and other assets that have been acquired in satisfaction of loans, and real property no longer used in the Bank’s business. These assets are recorded at the estimated fair value less the estimated cost of disposition and carried at the lower of either cost or market. Fair value is based on independent appraisals and other relevant factors. Any initial reduction in the carrying amount of a loan to the fair value of the collateral received less selling costs is charged to the allowance for loan losses. Each asset is revalued on an annual basis, or more often if market conditions necessitate. Subsequent losses on the periodic revaluation of these assets and gains or losses recognized on disposition are charged to current earnings, as are revenues from and costs of operating and maintaining real property. Improvements made to real property are capitalized if the expenditures are expected to be recovered upon the sale of the property.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets  Goodwill represents the excess of consideration paid over the fair value of net assets acquired or the excess of the fair value liabilities assumed over consideration received in a business combination. Goodwill is not amortized but is assessed for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment. The impairment test compares the estimated fair value of a reporting unit with its net book value. The Company has assigned all goodwill to one reporting unit that represents overall banking operations. The fair value of the reporting unit is based on valuation techniques that market participants would use in an acquisition of the whole unit, such as estimated discounted cash flows, the quoted market price of the Company’s stock, adjusted for a control premium, and observable average price-to-earnings and price-to-book multiples of competitors. If the unit’s fair value is less than its carrying value, an estimate of the implied fair value of the goodwill is compared to the goodwill’s carrying value, and any impairment recognized.  Other identifiable intangible assets with finite lives, such as core deposit intangibles, customer lists and trade name, are initially recorded at fair value and are generally amortized over the periods benefited. These assets are evaluated for impairment in a similar manner to long-lived assets.
Life Insurance Contracts	Life Insurance Contracts  Bank-owned life insurance contracts (BOLI) are comprised of long-term life insurance contracts on the lives of certain current and past employees where the insurance policy benefits and ownership are retained by the employer. Its cash surrender value is an asset that the Company uses to partially offset the future cost of employee benefits. The cash value accumulation on BOLI is permanently tax deferred if the policy is held to the insured person’s death and certain other conditions are met.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities  The Company records all derivatives on the balance sheet at fair value as components of other assets and other liabilities. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge.  For derivatives designated as hedging the exposure to changes in the fair value of an asset or liability (fair value hedge), the gain or loss is recognized in earnings in the period of the fair value change together with the offsetting loss or gain on the hedged item attributable to the risk being hedged. Prior to the adoption of Accounting Standards Update (“ASU”) 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” on January 1, 2018, the effective portion of a derivative’s gain or loss for derivatives designated as hedging exposure to variable cash flows of a forecasted transaction (cash flow hedge), was initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings or in certain circumstances, when the hedge is terminated. The ineffective portion of the gain or loss was reported in earnings immediately. The provisions of ASU 2017-12 eliminated the concept of ineffectiveness for instruments that qualify for hedge accounting treatment; thus, the full impact of hedge gains and losses will be recognized in the period in which the hedged transaction impacts the entity’s earnings. For derivatives that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.  Note 10 - Derivatives describes the derivative instruments currently used by the Company and discloses how these derivatives impact the Company’s financial position and results of operations.
Stockholders' Equity	Stockholders’ Equity  Common stock reflects shares issued at par value. Repurchase of the Company’s common stock (treasury stock) is recorded at cost as a reduction of stockholders’ equity within capital surplus in the accompanying Consolidated Balance Sheets and the Statements of Changes in Stockholders’ Equity. When treasury shares are subsequently reissued, treasury stock is reduced by the cost of such stock using the first-in-first-out method, with the difference recorded in capital surplus or retained earnings, as applicable.
Revenue Recognition	Revenue Recognition  Interest Income Interest income is recognized on an accrual basis driven by written contracts, such as loan agreements or securities contracts. Loan origination fees are recognized over the life of the loan as an adjustment to yield.  Service Charges on Deposit Accounts Service charges on deposit accounts include transaction based fees for non-sufficient funds , account analysis fees, and other service charges on deposits, including monthly account service fees. Non-sufficient funds fees are recognized at the time when the account overdraft occurs in accordance with regulatory guidelines. Account analysis fees consist of fees charged on certain business deposit accounts based upon account activity as well as other monthly account fees, and are recorded under the accrual method of accounting as services are performed.  Other service charges are earned by providing depositors safeguard and remittance of funds as well as by providing other elective services for depositors that are performed upon the depositor’s request. Charges for deposit services for the safeguard and remittance of funds are recognized at the end of the statement cycle, after services are provided, as the customer retains funds in the account. Revenue for other elective services is earned at the point in time the customer uses the service.  Trust Fees Trust fee income represents revenue generated from asset management services provided to individuals, businesses, and institutions. The Company has a fiduciary responsibility to the beneficiary of the trust to perform agreed upon services which can include investing assets, periodic reporting, and providing tax information regarding the trust. In exchange for these trust and custodial services, the Company collects fee income from beneficiaries as contractually determined via fee schedules. The Company’s performance obligation is primarily satisfied over time as the services are performed and provided to the customer. These fees are recorded under the accrual method of accounting as the services are performed. The Company generally acts as the principal in these transactions and records revenue and expenses on a gross basis.  Bank Card and Automated Teller Machine (“ATM”) Fees Bank card and ATM fees include credit card, debit card and ATM transaction revenue. The majority of this revenue is card interchange fees earned through a third party network. Performance obligations are satisfied for each transaction when the card is used and the funds are remitted. The network establishes interchange fees that the merchant remits for each transaction, and costs are incurred from the network for facilitating the interchange with the merchant. Card fees also include merchant services fees earned for providing merchants with card processing capabilities.  ATM income is generated from allowing customers to withdraw funds from other banks’ machines and from allowing a non-customer cardholder to withdraw funds from the Company’s machines. The Company satisfies its performance obligations for each transaction at the point in time that the withdrawal is processed.  Bank card and ATM fee income is recorded on accrual basis as services are provided with the related expense reflected in data processing expense.  Investment and Annuity Fees and Insurance Commissions Investment and annuity services fee income represents income earned from investment and advisory services. The Company provides its customers with access to investment products through the use of third party carriers to meet their financial needs and investment objectives. Upon selection of an investment product, the customer enters into a policy with the carrier. The performance obligation is satisfied by fulfilling its responsibility to acquire the investment for which a commission fee is earned from the carrier based on agreed-upon fee percentages on a trade date basis. The Company has a contractual relationship with a third party broker dealer to provide full service brokerage and investment advisory activities. As the agent in the arrangement, the Company recognizes the investment services commissions on a net basis. Investment revenue also includes portfolio management fees, which represent monthly fees charged on a contractual basis to customers for the management of their investment portfolios and are recorded under the accrual method of accounting on a gross basis, with expenses recorded in the appropriate expense line item.  This revenue line item includes investment banking income, which includes fees for services arising from securities offerings or placements in which the Company acts as a principal. Revenue is recognized at the time the underwriting is completed and the revenue is reasonably determinable. Any costs associated with these transactions are reflected in the appropriate expense line item.  Insurance commission revenue is recognized on a gross basis as of the effective date of the insurance policy as the Company’s performance obligation is connecting the customer to the insurance products. The Company also receives contingent commissions from insurance companies as additional incentive for achieving specified premium volume goals and/or the loss experience of the insurance placed. Contingent commissions from insurance companies are recognized when determinable, which is generally when such commissions are received or when we receive data from the insurance companies that allows the reasonable estimation of these amounts. Any costs associated with these transactions are reflected in the appropriate expense line item.  Secondary Mortgage Market Operations Secondary mortgage market operations revenue is primarily comprised of service release premiums earned on the sale of closed-end mortgage loans to other financial institutions or government agencies that are recognized in revenue as each sales transaction occurs.  Net Gain (Loss) on Sales of Assets Net gain (loss) on sales of assets reflects the excess (deficiency) of proceeds received over the carrying amount of assets sold plus cost to sell for various assets other than foreclosed real estate. Gain or loss on the sale of assets are recognized as each transaction occurs.  Securities Transactions Securities transactions includes net realized gain (losses) on securities sold reflecting the excess (deficiency) of proceeds received over the specifically identified carrying amount of the assets being sold plus cost to sell. Securities sales are recorded as each transaction occurs on a trade-date basis. Securities transactions also include declines in fair value for both available for sale and held to maturity securities when those declines are deemed to be other than temporary.  Income from Bank-Owned Life Insurance Bank-owned life insurance income primarily represents income earned from the appreciation of the cash surrender value of insurance contracts held and the proceeds of insurance benefits. Revenue from the proceeds of insurance benefits is recognized at the time a claim is confirmed.  Credit Related Fees Credit-related fee income includes letters of credit fees and unused commercial commitment fees. Revenue for letters of credit fees is recognized over time. Revenue for unused commercial commitment fees are recognized based on contractual terms, generally when collected.  Income from Derivatives Income from derivatives consists primarily of interest rate swap fees, net of fair value adjustments for customer derivatives and the related offsetting agreements with unrelated financial institutions for which the derivative instruments are not designated as hedges. This line item also includes the resulting gain or loss from ineffectiveness on derivatives that are designated as hedged items.  Other Miscellaneous Income Other miscellaneous income represents a variety of revenue streams, including safe deposit box income, wire transfer fees, syndication fees and any other income not reflected above. Income is recorded once the performance obligation is satisfied, generally on the accrual basis or on a cash basis if not material and/or considered constrained. 
Advertising Costs	Advertising Costs  Advertising costs are expensed as incurred.
Income Taxes	Income Taxes  Income taxes are accounted for using the asset and liability method. Current tax liabilities or assets are recognized for the estimated income taxes payable or refundable on tax returns to be filed with respect to the current year. Deferred tax assets and liabilities are based on temporary differences between the financial statement carrying amounts and the tax bases of the Company’s assets and liabilities. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be realized or settled. Valuation allowances are established against deferred tax assets if, based on all available evidence, it is more likely than not that some or all of the assets will not be realized. The benefit of a position taken or expected to be taken in a tax return is recognized when it is more likely than not that the position will be sustained on its technical merits. The effects of changes in tax rates and laws upon deferred tax balances are recognized in the period in which the legislation is enacted.  The Company makes investments that generate investment tax credits (ITC). The Company uses the deferral method of accounting w hereby the tax benefit from the investment tax credits is recognized as a reduction of the book basis of the related asset and is amortized into income over the tax life of the underlying investment.  The Company also invests in projects that yield tax credits issued under the Qual ified Zone Academy Bonds (QZAB) and Qualified S chool Construction Bonds (QSCB) that are available on issuances prior to December 31, 2017, as well as Federal and Sta te New Market Tax Credit (NMTC) programs. Returns on these investments are generated through the receipt of federal and state tax credits. The tax credits are recorded as a reduction to the income tax provision in the year that they are earned. Tax credits from QZAB and QSCB bonds are generally earned over the life of the bonds in lieu of interest income. Credits on Federal NMTC investments are earned over the seven year compliance period beginning with the year of investment. Credits on State NMTC investments are generally earned over a three to five year period depending upon the specific state program. Tax credits are earned over a 10 year period for Low-Income Housing investments beginning with the year in which rental activity begins. These tax credits, if not used in the tax return for the year when the credits are first available for use, can be carried forward for 20 years. For those investments where the return of the principal is not expected, the equity investment is amortized over the life of the tax compliance period as a component of noninterest expense. 
Retirement Benefits	Retirement Benefits  The Company sponsors defined benefit pension plans and certain other defined benefit postretirement plans for eligible employees. The amounts reported in the consolidated financial statements with respect to these plans are based on actuarial valuations that incorporate various assumptions regarding future experience under the plans. Note 16 – Retirement Benefit Plans discusses the actuarial assumptions and provides information about the liabilities or assets recognized for the funded status of the Company’s obligations under these plans, the net benefit expense charged to current operations, and the amounts recognized as a component of other comprehensive income loss and AOCI.
Share-Based Payment Arrangements	Share-Based Payment Arrangements  The grant date fair value of equity instruments awarded to employees and directors establishes the cost of the services received in exchange, and the cost associated with awards that are expected to vest is recognized over the requisite service period. Share-based compensation for service-based awards that contain a graded vesting schedule is recognized over on a straight-line basis over the requisite service period for the entire award. Forfeitures of unvested awards are recognized in earnings in the period in which they occur. Refer to Note 17 – Share-Based Payment Arrangements for additional information.
Earnings Per Share	Earnings Per Share  The Company calculates earnings per share using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to the common dividends declared and participation rights in undistributed earnings. Participating securities currently consist of unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents.  Basic earnings per common share is computed by dividing income applicable to common shareholders by the weighted-average number of common shares outstanding for the applicable period. Shares outstanding exclude treasury shares and unvested share-based payment awards under long-term incentive compensation plans and directors’ compensation plans. Diluted earnings per common share is computed using the weighted-average number of common shares outstanding increased by the number of shares in which employees would vest under performance-based stock awards and stock unit awards based on expected performance factors and by the number of additional shares that would have been issued if potentially dilutive stock options were exercised, each as determined using the treasury stock method.
Reportable Segment Disclosures	Reportable Segment Disclosures  Accounting standards require that information be reported about a company’s operating segments using a “management approach.” Reportable segments are identified in these standards as those revenue-producing components for which discrete financial information is produced internally and which are subject to evaluation by the chief operating decision maker in deciding how to allocate resources to segments. The Company’s stated strategy is to provide a consistent package of banking products and services throughout a coherent market area; as such, the Company has identified its overall banking operations as its only reportable segment. Because the overall banking operations comprise substantially all of the Company’s consolidated operations, no separate segment disclosures are presented.
Other	Other  Assets held by the Bank in a fiduciary capacity are not assets of the Bank and are not included in the Consolidated Balance Sheets.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS  Accounting Standards Adopted in 2018  In August 2018, the FASB issued ASU 2018-15, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” The amendments in this Update improve current GAAP by clarifying the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract, which aligns with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted this standard during the third quarter of 2018. Adoption of this standard did not have a material impact upon the Company’s financial condition or results of operations.  In March 2018, the FASB issued ASU 2018-05, “Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118.” The ASU amends Topic 740 to incorporate SEC guidance issued in its Staff Bulletin No. 118 (SAB 118). SAB 118 addressed the application of GAAP in situations when a registrant does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act. The amendments in this update were effective upon issuance, at which time the Company adopted the standard. The Company disclosed a benefit related to the impact of impact of the Tax Act as provisional; however, no adjustment to this amount was required. Adoption of this standard did not have a material impact on the Company’s financial condition or results of operations.  In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” with the objective of improving financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The update provides changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The amendments in this update are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period after issuance of the update. All transition requirements and elections are to be applied to hedging relationships existing on the date of adoption, and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Company early adopted this standard effective January 1, 2018 and has made certain adjustments to its existing designation documentation for active hedging relationships in order to take advantage of specific provisions in the new guidance and to fully align its documentation with the ASU. The adoption of this standard did not have a material impact on the Company’s financial condition or results of operations. See further discussion in Note 10 – Derivatives.  In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs,” to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The amendments require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. The amendments also allow only the service cost component to be eligible for capitalization when applicable. These amendments are effective for public business entities for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Disclosures of the nature of and reason for the change in accounting principle are required in the first interim and annual periods of adoption. The Company adopted the standard effective January 1, 2018 and the amendments were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the statement of income. Refer to Note 16 – Retirement Plans – for detail on the components of net periodic pension and post-retirement benefit costs that were reclassified for each reporting period. The provisions of this update apply only to presentation and therefore did not have a material impact on the Company’s financial condition or results of operations.  In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” affecting any entity that enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. The core principle of this standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Most revenue associated with financial instruments, including interest and loan origination fees, were outside the scope of the guidance. Gains and losses on investment securities, derivatives, and sales of financial instruments were also excluded from the scope. The FASB issued several subsequent updates that deferred by one year the effective date; clarified its guidance for performing the principal-versus-agent analysis; clarified guidance for identifying performance obligations allowing entities to ignore immaterial promised goods and services in the context of a contract with a customer and other clarifying guidance and technical corrections. Entities could elect to adopt the guidance either on a full or modified retrospective basis. The standard was effective and the Company adopted this guidance on January 1, 2018, using the modified retrospective approach. The Company inventoried and evaluated its contracts with customers for compliance with the standard and did not identify material changes to the timing of revenue recognition as the standard was largely consistent with the existing guidance and current practices. Therefore, the adoption of this guidance did not have a material impact on the Company’s financial condition or results of operations and there was no cumulative effect adjustment to opening retained earnings. However, upon adoption the Company has begun presenting certain underwriting costs (previously offset against Investment and Annuity Fees), as well as certain subadvisor costs (previously offset against Trust Fees) gross as noninterest expense, neither of which are material to operating results. Due to the nature of the Company’s primary sources of revenue, there are no significant receivables, contract assets or contract liabilities not otherwise disclosed. The Company has assessed that its current disclosures are consistent with the requirements of the standard to present revenue disaggregated into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Additional qualitative disclosures about the Company’s noninterest income and revenue recognition policies is presented in “Revenue Recognition” section of this note.  The following ASUs were also adopted by the Company on January 1, 2018, none of which had a significant impact on the Company’s consolidated financial statements:  · ASU 2018-03,Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities; · ASU 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting; · ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business; · ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory; · ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; and · ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities  Issued but Not Yet Adopted Accounting Standards  In August 2018, the FASB issued ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” The amendments in this Update modify certain disclosure requirements by removing disclosures that are no longer considered cost beneficial, clarifying specific requirements of disclosures, and adding disclosure requirements identified as relevant. The amendments in this Update are effective for fiscal years ending after December 15, 2020 for public business entities, and early adoption is permitted. Application of the guidance applies only to disclosure presentation and will have no impact upon the Company’s results of operations or financial condition. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” The amendments in this Update modify certain disclosure requirements on fair value measurements set forth in Topic 820, Fair Value Measurements. In addition, the amendments in this Update eliminate the phrase “an entity shall disclose at a minimum” to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements. The amendments in this Update are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2019, and early adoption is permitted. Application of the guidance applies only to disclosure presentation and will have no impact upon the Company’s results of operations or financial condition.  In June 2018, the FASB issued ASU 2018-07, “Compensation – Stock Compensation – (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting,” to expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods and services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide financing to the issuer or awards granted in conjunction with the selling of goods or services to customers as part of a contract accounted for under Topic 606, “Revenue from Contracts with Customers.” The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. The Company does not expect the adoption of this guidance to have a material impact upon its financial condition or results of operations.  In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques currently applied will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on debt securities and purchased financial assets with credit deterioration. The ASU is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with a cumulative-effect adjustment to retained earnings as of the beginning of the year of adoption. Early application is permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is not planning to early adopt this guidance. The Company has engaged third party consultants and formed cross-functional working groups comprised of individuals from various areas including credit, finance, treasury, risk management and information technology for implementation. Five work streams have been created to develop the expected credit loss models; execute system implementation; complete balance sheet scoping; ensure the design of effective internal controls surrounding new processes; and provide executive oversight of the project. The Company has substantially completed the configuration of a vendor provided software solution for which implementation is expected to be complete in second quarter of 2019. The model development team is finalizing testing of credit loss models developed and validation of models will begin in first quarter of 2019. While the Company has not yet quantified the financial impact of adoption, the expectation is that application of this guidance will result in an increase in the allowance for loan losses given the change in methodology from covering losses inherent in the portfolio to covering losses over the remaining expected life of the portfolio, and the reclassification of nonaccretable difference on purchased credit impaired loans to allowance (offset by an increase in the carrying value of the related loans). Application of the guidance is also expected to result in the establishment of an allowance for credit loss on held to maturity debt securities. The amount of the increase in these allowances will be impacted by the portfolio composition and quality at the adoption date as well as economic conditions and forecasts at that time.  In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. With the exception of short-term leases, lessees will be required to recognize a lease liability representing the lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset representing the lessee’s right to use, or control the use of, a specified asset for the lease term. Consequently, lessees will no longer be able to utilize leases as a source of off-balance sheet financing. Lessor accounting is largely unchanged under the new guidance, except for clarification of the definition of initial direct costs which may impact the timing of recognition of those costs. Subsequent to the issuance of this update, the FASB issued three additional ASUs that provide codification improvements and certain transition elections, including ASU 2018- 11, which permits an additional transition method whereby an entity may elect to record a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Thus, the entity’s reporting for the comparative periods presented in the financial statements in which the entity adopts the new lease requirements would continue to be in accordance with current GAAP (Topic 840), including disclosures. Public business entities are required to apply the standard for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company will adopt the standard effective January 1, 2019, including the election of the transition method permitted by ASU 2018-11. Upon adoption, the Company will record a gross-up of assets and liabilities in its Consolidated Balance Sheet, with approximately $116 million for right of use assets and $131 million of lease payment obligations offset by the elimination of $15 million of existing lease incentive and other deferred rent liabilities. The impact of adoption to the consolidated results of operations is not expected to be material. 

Acquisitions and Divestiture (T

Acquisitions and Divestiture (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Goodwill	   (in thousands)  Goodwill balance at December 31, 2016 $ 621,193  Additions and adjustments:  Initial goodwill recorded in FNBC I transaction 95,568  Measurement period adjustments - FNBC I transaction 7,979  Initial goodwill recorded in FNBC II transaction 23,009  Measurement period adjustments - FNBC II transaction (2,226)  Goodwill balance at December 31, 2017 $ 745,523  Additions and adjustments:  Initial goodwill recorded in acquisition of trust and asset management business 45,634  Measurement period adjustments - acquisition of trust and asset management business (185)  Goodwill balance at December 31, 2018 $ 790,972 
Schedule of Merger-Related Expense	   Years Ended December 31,  (in thousands) 2018 2017  Personnel expense $ 1,257 $ 3,662  Net occupancy and equipment expense 309 777  Professional services expense 2,827 9,681  Data processing expense 1,583 974  Other real estate - (1,511)  Advertising expense 52 1,389  Other expense 159 4,398  Total merger-related expenses $ 6,187 $ 19,370 
Capital One [Member]
Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed	   (in thousands)  ASSETS  Accounts receivable $ 2,803  Identifiable intangible assets 27,562  Total identifiable assets 30,365   LIABILITIES  Deposit liabilities 217,432  Other liabilities 151  Total liabilities 217,583  Net liabilities assumed (187,218)  Consideration received 141,769  Goodwill $ 45,449 
FNBC Transactions [Member]
Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed	   FNBC I FNBC II  (in thousands) March 10, 2017 April 28, 2017 Total  ASSETS  Cash and due from banks $ 2,856 $ 157,932 $ 160,788  Interest-bearing time deposits with other banks — 382,622 382,622  Fed funds sold and other short-term investments — 148 148  Securities — 213,877 213,877  Total loans 1,203,092 165,577 1,368,669  Property and equipment 11,946 8,988 20,934  Accrued interest receivable 3,143 885 4,028  Identifiable intangible assets 3,900 21,400 25,300  Deferred tax asset 856 1,364 2,220  Other assets 63 4,150 4,213  Total identifiable assets 1,225,856 956,943 2,182,799   LIABILITIES  Deposits 398,171 1,530,338 1,928,509  Short-term borrowings 510,749 85,886 596,635  Long-term debt 93,120 — 93,120  Other liabilities 1,607 3,079 4,686  Total liabilities 1,003,647 1,619,303 2,622,950  Net identifiable assets acquired (liabilities assumed) 222,209 (662,360) (440,151)  Consideration (Paid) Received (325,756) 641,577 315,821  Goodwill $ 103,547 $ 20,783 $ 124,330 

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Securities Available for Sale	   Securities Available for Sale  December 31, 2018 December 31, 2017  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 74,339 $ — $ 2,633 $ 71,706 $ 99,535 $ — $ 2,263 $ 97,272  Municipal obligations 246,713 360 6,646 240,427 245,997 1,135 3,346 243,786  Residential mortgage-backed securities 1,468,912 4,284 29,794 1,443,402 1,729,989 5,611 20,387 1,715,213  Commercial mortgage-backed securities 799,060 1,953 30,936 770,077 704,518 480 17,863 687,135  Collateralized mortgage obligations 163,282 903 2,260 161,925 165,518 4 1,559 163,963  Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,755,806 $ 7,500 $ 72,269 $ 2,691,037 $ 2,949,057 $ 7,230 $ 45,418 $ 2,910,869 
Amortized Cost and Fair Value of Securities Held to Maturity	   Securities Held to Maturity  December 31, 2018 December 31, 2017  Gross Gross Gross Gross  Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value Cost Gains Losses Value  U.S. Treasury and government agency securities $ 50,000 $ — $ 478 $ 49,522 $ 50,000 $ — $ 289 $ 49,711  Municipal obligations 688,201 2,347 9,503 681,045 723,094 8,323 4,245 727,172  Residential mortgage-backed securities 640,393 1,461 6,117 635,737 725,748 4,175 2,690 727,233  Commercial mortgage-backed securities 357,175 376 10,882 346,669 317,185 40 3,915 313,310  Collateralized mortgage obligations 1,243,778 1,598 22,493 1,222,883 1,161,484 572 17,472 1,144,584  $ 2,979,547 $ 5,782 $ 49,473 $ 2,935,856 $ 2,977,511 $ 13,110 $ 28,611 $ 2,962,010 
Proceeds from and Gross Losses on Sale of Securities	   Years Ended December 31,  (in thousands) 2018 2017 2016  Proceeds $ 455,162 $ 213,877 $ 173,215  Gross gains — — 1,965  Gross losses 25,480 — 211 
Available for Sale [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	   (in thousands) Amortized Cost Fair Value  Debt Securities Available for Sale  Due in one year or less $ 1,862 $ 1,868  Due after one year through five years 105,364 106,255  Due after five years through ten years 1,200,188 1,163,870  Due after ten years 1,448,392 1,419,044  Total available for sale debt securities $ 2,755,806 $ 2,691,037 
Securities with Unrealized Losses	The details for securities classified as available for sale with unrealized losses as of December 31, 2018 follow.      Available for sale  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 71,706 $ 2,633 $ 71,706 $ 2,633  Municipal obligations 41,203 591 170,883 6,054 212,086 6,645  Residential mortgage-backed securities 305,090 2,485 762,826 27,309 1,067,916 29,794  Commercial mortgage-backed securities 96,226 1,851 570,485 29,085 666,711 30,936  Collateralized mortgage obligations 254 1 111,804 2,259 112,058 2,260  $ 442,773 $ 4,928 $ 1,687,704 $ 67,340 $ 2,130,477 $ 72,268  The details for securities classified as available for sale with unrealized losses as of December 31, 2017 follow.      Available for sale  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ 45,616 $ 42 $ 51,157 $ 2,221 $ 96,773 $ 2,263  Municipal obligations 2,768 11 173,530 3,335 176,298 3,346  Residential mortgage-backed securities 461,835 4,195 898,099 16,192 1,359,934 20,387  Commercial mortgage-backed securities 203,618 995 411,046 16,868 614,664 17,863  Collateralized mortgage obligations 128,174 1,076 35,488 483 163,662 1,559  $ 842,011 $ 6,319 $ 1,569,320 $ 39,099 $ 2,411,331 $ 45,418 
Held to Maturity [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	   (in thousands) Amortized Cost Fair Value  Debt Securities Held to Maturity  Due in one year or less $ 18,654 $ 18,676  Due after one year through five years 127,861 126,495  Due after five years through ten years 1,425,846 1,405,836  Due after ten years 1,407,186 1,384,849  Total held to maturity debt securities $ 2,979,547 $ 2,935,856 
Securities with Unrealized Losses	The details for securities classified as held to maturity with unrealized losses as of December 31, 2018 follow.      Held to maturity  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 49,521 $ 478 $ 49,521 $ 478  Municipal obligations 233,469 2,256 233,280 7,247 466,749 9,503  Residential mortgage-backed securities 90,730 123 235,251 5,994 325,981 6,117  Commercial mortgage-backed securities — — 305,419 10,882 305,419 10,882  Collateralized mortgage obligations 77,394 281 897,153 22,212 974,547 22,493  $ 401,593 $ 2,660 $ 1,720,624 $ 46,813 $ 2,122,217 $ 49,473  The details for securities classified as held to maturity with unrealized losses as of December 31, 201 7 follow.      Held to maturity  Losses < 12 Months Losses 12 Months or > Total  Gross Gross Gross  Fair Unrealized Fair Unrealized Fair Unrealized  ( in thousands) Value Losses Value Losses Value Losses  U.S. Treasury and government agency securities $ — $ — $ 49,711 $ 289 $ 49,711 $ 289  Municipal obligations 14,603 19 230,960 4,226 245,563 4,245  Residential mortgage-backed securities 8,815 99 230,277 2,591 239,092 2,690  Commercial mortgage-backed securities 174,882 744 72,499 3,171 247,381 3,915  Collateralized mortgage obligations 570,289 5,653 472,536 11,819 1,042,825 17,472  $ 768,589 $ 6,515 $ 1,055,983 $ 22,096 $ 1,824,572 $ 28,611 

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Net of Unearned Income	    (in thousands) 2018 2017  Commercial non-real estate $ 8,620,601 $ 8,297,937  Commercial real estate - owner occupied 2,457,748 2,142,439  Total commercial and industrial 11,078,349 10,440,376  Commercial real estate - income producing 2,341,779 2,384,599  Construction and land development 1,548,335 1,373,421  Residential mortgages 2,910,081 2,690,472  Consumer 2,147,867 2,115,295  Total loans $ 20,026,411 $ 19,004,163 
Allowance for Loan Losses by Portfolio Class	   Commercial Non-Real Estate Commercial Real Estate- Owner Occupied Total Commercial and Industrial Commercial Real Estate- Income Producing Construction and Land Development Residential Mortgages Consumer Total  (in thousands) Year Ended December 31, 2018  Allowance for loan losses:  Beginning balance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Charge-offs (40,069) (8,059) (48,128) (1,633) (334) (614) (23,913) (74,622)  Recoveries 14,385 317 14,702 221 96 2,179 5,162 22,360  Net provision for loan losses (4,482) 8,537 4,055 5,341 8,513 (2,627) 20,834 36,116  Other — — — — — — (6,648) (6,648)  Ending balance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514  Ending balance:  Allowance:  Individually evaluated for impairment $ 3,636 $ 607 $ 4,243 $ 210 $ 1 $ 444 $ 216 $ 5,114  Amounts related to purchased credit impaired loans 239 215 454 43 83 9,766 388 10,734  Collectively evaluated for impairment 93,877 12,935 106,812 17,385 15,563 13,572 25,334 178,666  Total allowance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514  Loans:  Individually evaluated for impairment $ 239,384 $ 21,666 $ 261,050 $ 2,701 $ 121 $ 3,876 $ 1,007 $ 268,755  Purchased credit impaired loans 6,629 6,212 12,841 3,757 3,387 105,430 4,181 129,596  Collectively evaluated for impairment 8,374,588 2,429,870 10,804,458 2,335,321 1,544,827 2,800,775 2,142,679 19,628,060  Total loans $ 8,620,601 $ 2,457,748 $ 11,078,349 $ 2,341,779 $ 1,548,335 $ 2,910,081 $ 2,147,867 $ 20,026,411      Commercial Non-Real Estate Commercial Real Estate- Owner Occupied Total Commercial and Industrial Commercial Real Estate- Income Producing Construction and Land Development Residential Mortgages Consumer Total  (in thousands) Year Ended December 31, 2017  Allowance for loan losses:  Beginning balance $ 147,052 $ 11,083 $ 158,135 $ 13,509 $ 6,271 $ 25,361 $ 26,142 $ 229,418  Charge-offs (51,479) (558) (52,037) (259) (696) (2,839) (31,430) (87,261)  Recoveries 7,526 848 8,374 988 1,603 1,064 6,680 18,709  Net provision for loan losses 24,866 1,589 26,455 (529) 194 3,602 29,246 58,968  Increase (decrease) in FDIC loss share receivable (47) — (47) — — (2,344) (135) (2,526)  Ending balance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Ending balance:  Allowance:  Individually evaluated for impairment $ 16,129 $ 793 $ 16,922 $ 1,326 $ 11 $ 189 $ 118 $ 18,566  Amounts related to purchased credit impaired loans 525 465 990 41 172 12,258 646 14,107  Collectively evaluated for impairment 111,264 11,704 122,968 12,342 7,189 12,397 29,739 184,635  Total allowance $ 127,918 $ 12,962 $ 140,880 $ 13,709 $ 7,372 $ 24,844 $ 30,503 $ 217,308  Loans:  Individually evaluated for impairment $ 267,881 $ 21,491 $ 289,372 $ 15,530 $ 363 $ 10,640 $ 1,292 $ 317,197  Purchased credit impaired loans 5,941 7,294 13,235 2,742 5,829 119,553 6,178 147,537  Collectively evaluated for impairment 8,024,115 2,113,654 10,137,769 2,366,327 1,367,229 2,560,279 2,107,825 18,539,429  Total loans $ 8,297,937 $ 2,142,439 $ 10,440,376 $ 2,384,599 $ 1,373,421 $ 2,690,472 $ 2,115,295 $ 19,004,163 
Composition of Nonaccrual Loans by Portfolio Class	   December 31,  (in thousands) 2018 2017  Commercial non-real estate $ 110,653 $ 152,863  Commercial real estate - owner occupied 16,895 25,989  Total commercial and industrial 127,548 178,852  Commercial real estate - income producing 4,991 14,574  Construction and land development 2,146 3,807  Residential mortgages 35,866 40,480  Consumer 16,744 15,087  Total loans $ 187,295 $ 252,800 
Troubled Debt Restructurings Modified by Portfolio Class	   Years Ended December 31,  ($ in thousands) 2018 2017 2016  Outstanding Recorded Investment Outstanding Recorded Investment Outstanding Recorded Investment  Troubled Debt Restructurings: Number of Contracts Pre- Modification Post- Modification Number of Contracts Pre- Modification Post- Modification Number of Contracts Pre- Modification Post- Modification  Commercial non-real estate 29 $ 85,306 $ 85,306 52 $ 162,909 $ 162,909 38 $ 128,449 $ 128,449  Commercial real estate - owner occupied 2 6,138 6,138 5 5,684 5,684 1 148 148  Total commercial and industrial 31 91,444 91,444 57 168,593 168,593 39 128,597 128,597  Commercial real estate - income producing 1 1,564 1,564 5 5,625 5,625 1 2,943 2,943  Construction and land development — — — — — — — — —  Residential mortgages 14 1,297 1,297 15 2,812 2,812 7 694 694  Consumer 10 455 455 1 40 40 — — —  Total loans 56 $ 94,760 $ 94,760 78 $ 177,070 $ 177,070 47 $ 132,234 $ 132,234 
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class	   December 31, 2018  (in thousands) Recorded Investment Without an Allowance Recorded Investment With an Allowance Unpaid Principal Balance Related Allowance  Commercial non-real estate $ 144,625 $ 94,759 $ 273,290 $ 3,636  Commercial real estate - owner occupied 13,027 8,639 25,888 607  Total commercial and industrial 157,652 103,398 299,178 4,243  Commercial real estate - income producing 1,138 1,563 3,428 210  Construction and land development 100 21 121 1  Residential mortgages 2,058 1,818 4,421 444  Consumer 279 728 1,253 216  Total loans $ 161,227 $ 107,528 $ 308,401 $ 5,114     December 31, 2017  (in thousands) Recorded Investment Without an Allowance Recorded Investment With an Allowance Unpaid Principal Balance Related Allowance  Commercial non-real estate $ 116,682 $ 151,199 $ 285,685 $ 16,129  Commercial real estate - owner occupied 16,927 4,564 24,829 793  Total commercial and industrial 133,609 155,763 310,514 16,922  Commercial real estate - income producing 5,101 10,429 15,687 1,326  Construction and land development 100 263 363 11  Residential mortgages 8,245 2,395 13,855 189  Consumer — 1,292 1,294 118  Total loans $ 147,055 $ 170,142 $ 341,713 $ 18,566   The tables below present the average balances and interest income for total impaired loans for the years ended December 31, 2018 and 2017. Interest income recognized represents interest on accruing loans modified in a TDR.      Years Ended  December 31, 2018 December 31, 2017  (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized  Commercial non-real estate $ 286,146 $ 7,919 $ 255,710 $ 2,774  Commercial real estate - owner occupied 25,325 343 7,901 62  Total commercial and industrial 311,471 8,262 263,611 2,836  Commercial real estate - income producing 9,155 71 14,565 146  Construction and land development 145 - 1,018 2  Residential mortgages 5,598 18 5,784 18  Consumer 814 39 1,558 13  Total loans $ 327,183 $ 8,390 $ 286,536 $ 3,015 
Age Analysis of Past Due Loans by Portfolio Class	  December 31, 2018 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days past due Total Past Due Current Total Loans Recorded Investment > 90 Days and Accruing  (in thousands)  Commercial non-real estate $ 12,257 $ 3,895 $ 77,551 $ 93,703 $ 8,526,898 $ 8,620,601 $ 10,823  Commercial real estate - owner occupied 2,394 1,570 14,542 18,506 2,439,242 2,457,748 380  Total commercial and industrial 14,651 5,465 92,093 112,209 10,966,140 11,078,349 11,203  Commercial real estate - income producing 2,371 772 5,495 8,638 2,333,141 2,341,779 1,844  Construction and land development 7,397 1,129 2,165 10,691 1,537,644 1,548,335 644  Residential mortgages 32,869 14,706 23,175 70,750 2,839,331 2,910,081 —  Consumer 20,402 4,695 9,665 34,762 2,113,105 2,147,867 618  Total loans $ 77,690 $ 26,767 $ 132,593 $ 237,050 $ 19,789,361 $ 20,026,411 $ 14,309     December 31, 2017 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Total Loans Recorded Investment > 90 Days and Accruing  (in thousands)  Commercial non-real estate $ 62,766 $ 10,761 $ 92,982 $ 166,509 $ 8,131,428 $ 8,297,937 $ 21,989  Commercial real estate - owner occupied 8,493 648 15,517 24,658 2,117,781 2,142,439 2,032  Total commercial and industrial 71,259 11,409 108,499 191,167 10,249,209 10,440,376 24,021  Commercial real estate - income producing 5,315 2,165 6,081 13,561 2,371,038 2,384,599 489  Construction and land development 4,113 1,056 3,412 8,581 1,364,840 1,373,421 477  Residential mortgages 33,621 10,554 30,537 74,712 2,615,760 2,690,472 2,208  Consumer 22,959 7,816 8,553 39,328 2,075,967 2,115,295 571  Total loans $ 137,267 $ 33,000 $ 157,082 $ 327,349 $ 18,676,814 $ 19,004,163 $ 27,766 
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield	   2018 2017  Carrying Carrying  Amount Accretable Amount Accretable  (in thousands) of Loans Yield of Loans Yield  Balance at beginning of period $ 153,403 $ 62,517 $ 190,915 $ 113,686  Additions — — 15,000 —  Payments received, net (39,556) (5,779) (69,591) (7,412)  Accretion 15,749 (15,749) 17,079 (17,079)  Increase (decrease) in expected cash flows based on actual  cash flow and changes in cash flow assumptions — (3,695) — (30,379)  Net transfers from nonaccretable difference  to accretable yield — — — 3,701  Balance at end of period $ 129,596 $ 37,294 $ 153,403 $ 62,517 
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	 December 31, 2018  (in thousands) Commercial Non-Real Estate Commercial Real Estate - Owner Occupied Total Commercial and Industrial Commercial Real Estate - Income Producing Construction and Land Development Total Commercial  Grade:  Pass $ 7,875,588 $ 2,274,211 $ 10,149,799 $ 2,265,087 $ 1,487,599 $ 13,902,485  Pass-Watch 260,510 84,271 344,781 46,535 49,099 440,415  Special Mention 75,752 23,149 98,901 5,510 816 105,227  Substandard 408,751 76,117 484,868 24,647 10,821 520,336  Doubtful — — — — — —  Total $ 8,620,601 $ 2,457,748 $ 11,078,349 $ 2,341,779 $ 1,548,335 $ 14,968,463      December 31, 2017  (in thousands) Commercial Non-Real Estate Commercial Real Estate - Owner Occupied Total Commercial and Industrial Commercial Real Estate - Income Producing Construction and Land Development Total Commercial  Grade:  Pass $ 7,190,604 $ 1,896,366 $ 9,086,970 $ 2,223,245 $ 1,291,638 $ 12,601,853  Pass-Watch 293,069 82,913 375,982 83,444 60,804 520,230  Special Mention 80,649 27,456 108,105 13,244 4,788 126,137  Substandard 733,558 135,704 869,262 64,658 16,191 950,111  Doubtful 57 — 57 8 — 65  Total $ 8,297,937 $ 2,142,439 $ 10,440,376 $ 2,384,599 $ 1,373,421 $ 14,198,396 
Residential Mortgage and Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	   December 31, 2018 December 31, 2017  (in thousands) Residential Mortgage Consumer Total Residential Mortgage Consumer Total  Performing $ 2,873,669 $ 2,130,395 $ 5,004,064 $ 2,647,784 $ 2,099,637 $ 4,747,421  Nonperforming 36,412 17,472 53,884 42,688 15,658 58,346  Total $ 2,910,081 $ 2,147,867 $ 5,057,948 $ 2,690,472 $ 2,115,295 $ 4,805,767 

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property and Equipment [Abstract]
Property and Equipment	   December 31,  (in thousands) 2018 2017  Land and land improvements $ 70,960 $ 71,061  Buildings and leasehold improvements 311,409 305,277  Furniture, fixtures and equipment 92,805 92,360  Software 72,721 70,003  Assets under development 31,742 9,960  579,637 548,661  Accumulated depreciation and amortization (225,969) (214,998)  Property and equipment, net $ 353,668 $ 333,663 

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets [Abstract]
Carrying Value of Intangible Assets Subject to Amortization	    December 31, 2018  Purchase Accumulated Carrying  (in thousands) Value Amortization Value  Core deposit intangibles $ 215,955 $ 151,446 $ 64,509  Customer relationships 49,962 19,564 30,398  Merchant processing relationship 10,000 8,756 1,244  $ 275,917 $ 179,766 $ 96,151      December 31, 2017  Purchase Accumulated Carrying  (in thousands) Value Amortization Value  Core deposit intangibles $ 215,955 $ 132,878 $ 83,077  Customer relationships 22,400 16,882 5,518  Merchant processing relationship 10,000 7,955 2,045  $ 248,355 $ 157,715 $ 90,640 
Aggregate Amortization Expense	   Years Ended December 31,  (in thousands) 2018 2017 2016  Core deposit intangibles $ 18,566 $ 19,442 $ 16,411  Customer relationships 2,682 1,975 2,172  Merchant processing relationship 802 1,000 1,198  $ 22,050 $ 22,417 $ 19,781 
Estimated Amortization Expense of Other Intangible Assets	   (in thousands)  2019 $ 19,859  2020 15,924  2021 12,953  2022 10,599  2023 8,401  Thereafter 28,415  $ 96,151 

Time Deposits (Tables)

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Time Deposits [Abstract]
Schedule of Detailed Time Deposits	   December 31,  (in thousands) 2018 2017  Noninterest-bearing deposits $ 8,499,027 $ 8,307,497  Interest-bearing retail transaction and savings deposits 8,000,092 8,181,555  Interest-bearing public fund deposits  Public fund transaction and savings deposits 2,622,938 2,763,182  Public fund time deposits 383,578 277,136  Total interest-bearing public fund deposits 3,006,516 3,040,318  Retail time deposits 2,416,086 1,906,768  Brokered time deposits 1,228,464 817,064  Total interest-bearing deposits 14,651,158 13,945,705  Total deposits $ 23,150,185 $ 22,253,202 
Maturity of Time Deposits	   (in thousands)  2019 $ 3,235,947  2020 504,374  2021 209,149  2022 62,399  2023 13,848  Thereafter 2,411  Total time deposits $ 4,028,128 

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Short-Term Borrowings [Abstract]
Short-Term Borrowings	   December 31,  (in thousands) 2018 2017  Federal funds purchased:  Amount outstanding at period end $ 425 $ 140,754  Average amount outstanding during period 39,968 27,063  Maximum amount at any month end during period 100,925 140,754  Weighted-average interest at period end 2.00% 1.00%  Weighted-average interest rate during period 2.11% 1.37%  Securities sold under agreements to repurchase:  Amount outstanding at period end $ 428,599 $ 430,569  Average amount outstanding during period 456,000 501,719  Maximum amount at any month end during period 500,345 587,569  Weighted-average interest at period end 0.32% 0.17%  Weighted-average interest rate during period 0.23% 0.12%  FHLB borrowings:  Amount outstanding at period end $ 1,160,104 $ 1,132,567  Average amount outstanding during period 1,694,804 1,478,114  Maximum amount at any month end during period 2,410,258 2,061,652  Weighted-average interest at period end 2.48% 1.35%  Weighted-average interest rate during period 2.02% 1.00% 

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Long-Term Debt [Abstract]
Long-Term Debt	   December 31,  (in thousands) 2018 2017  Subordinated notes payable, maturing June 2045 $ 150,000 $ 150,000  Term note payable, maturing December 2018 — 89,200  Other long-term debt 79,598 71,378  Less: unamortized debt issuance costs (4,605) (5,065)  Total long-term debt $ 224,993 $ 305,513 
Long-Term Debt with Related Unamortized Debt Issuance Cost	  Unamortized  Debt  Issuance  (in thousands) Principal Costs  Subordinated notes payable, maturing June 2045 $ 150,000 $ 4,605  Other long-term debt 79,598 —  Total $ 229,598 $ 4,605 

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
Derivatives [Abstract]
Fair Values of Derivative Financial Instruments	    December 31, 2018 December 31, 2017  Derivative (1) Derivative (1)  (in thousands) Type of Hedge Notional or Contractual Amount Assets Liabilities Notional or Contractual Amount Assets Liabilities  Derivatives designated  as hedging instruments:  Interest rate swaps Cash Flow $ 875,000 $ 3,954 $ 9,173 $ 875,000 $ — $ 14,020  Interest rate swaps Fair Value 483,110 — 2,089 483,110 — 2,475  $ 1,358,110 $ 3,954 $ 11,262 $ 1,358,110 $ — $ 16,495  Derivatives not designated  as hedging instruments:  Interest rate swaps (2) N/A $ 1,277,404 $ 23,670 $ 24,669 $ 1,144,789 $ 15,408 $ 15,857  Risk participation agreements N/A 171,222 10 131 119,951 23 109  Forward commitments to sell  residential mortgage loans N/A 77,208 110 664 80,462 1,000 290  Interest rate-lock commitments  on residential mortgage loans N/A 59,119 464 67 53,724 186 782  Foreign exchange forward  contracts N/A 37,749 751 718 42,260 2,453 2,419  Visa Class B derivative contract N/A 43,753 — 7,304 — — —  $ 1,666,455 $ 25,005 $ 33,553 $ 1,441,186 $ 19,070 $ 19,457  Total derivatives $ 3,024,565 $ 28,959 $ 44,815 $ 2,799,296 $ 19,070 $ 35,952  Less: netting adjustments (3) (11,979) (22,588) (4,913) (21,563)  Total derivate assets/liabilites 16,980 22,227 14,157 14,389  (1) Derivative assets and liabilities are reported in other assets or other liabilities, respectively, in the consolidated balance sheets. (2) The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions. (3) Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.
Effect of Derivative Instruments on the Statements of Income	   Year Ended  December 31,  Derivative Instruments: Location of Gain (Loss) Recognized in the Statement of Income: 2018 2017 2016  Interest rate swaps - cash flow hedges Interest income $ (4,497) $ (280) $ 2,310  Interest rate swaps - fair value hedges Interest expense (2,343) 829 -  All other instruments Other noninterest income 5,368 5,870 5,196  Total $ (1,472) $ 6,419 $ 7,506 
Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements	   December 31, 2018  Gross Amounts Offset in the Net Amounts Presented in the Gross Amounts Not Offset in the Statement of Financial Position  (in thousands) Gross Amounts Recognized Statement of Financial Position Statement of Financial Position Financial Instruments Cash Collateral Net Amount  Derivative Assets $ 16,167 $ (12,842) $ 3,325 $ 1,846 $ — $ 1,479  Derivative Liabilities $ 23,811 $ (21,651) $ 2,160 $ 1,846 $ 2,871 $ (2,557)      December 31, 2017  Gross Amounts Offset in the Net Amounts Presented in the Gross Amounts Not Offset in the Statement of Financial Position  (in thousands) Gross Amounts Recognized Statement of Financial Position Statement of Financial Position Financial Instruments Cash Collateral Net Amount  Derivative Assets $ 7,155 $ (5,007) $ 2,148 $ 2,148 $ — $ —  Derivative Liabilities $ 24,015 $ (20,077) $ 3,938 $ 2,148 $ 4,099 $ (2,309) 

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	   (in thousands) Available for Sale Securities HTM Securities Transferred from AFS Employee Benefit Plans Cash Flow Hedges Total  Balance, December 31, 2015 $ 4,268 $ (16,795) $ (67,890) $ (178) $ (80,595)  Net change in unrealized gain (loss) (49,839) — — (7,507) (57,346)  Reclassification of net (gain) loss realized  and included in earnings (1,912) — 5,928 — 4,016  Valuation adjustment for employee benefit plans — — (12,748) — (12,748)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,830 — — 3,830  Income tax expense (benefit) (18,804) 1,427 (2,209) (2,725) (22,311)  Balance, December 31, 2016 $ (28,679) $ (14,392) $ (72,501) $ (4,960) $ (120,532)  Net change in unrealized (loss) gain 6,903 — — (7,328) (425)  Reclassification of net loss realized  and included in earnings — — 5,201 600 5,801  Valuation adjustment for pension plan amendment — — 17,315 — 17,315  Other valuation adjustment for employee benefit plans — — (10,929) — (10,929)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,786 — — 3,786  Income tax expense (benefit) 1,067 1,393 4,228 (2,600) 4,088  Reclassification of certain tax effects (a) 6,669 2,586 13,936 2,139 25,330  Balance, December 31, 2017 $ (29,512) $ (14,585) $ (79,078) $ (11,227) $ (134,402)  Net change in unrealized loss (52,060) — — (697) (52,757)  Reclassification of net loss realized  and included in earnings 25,480 — 4,989 4,497 34,966  Other valuation adjustment for employee benefit plans — — (45,198) — (45,198)  Amortization of unrealized net loss on securities  transferred to held to maturity — 3,296 — — 3,296  Income tax expense (benefit) (5,967) 755 (9,040) 866 (13,386)  Balance, December 31, 2018 $ (50,125) $ (12,044) $ (110,247) $ (8,293) $ (180,709)  (a) Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income	   Amount reclassified from AOCI (a) Years Ended December 31, Increase (decrease) in affected line  (in thousands) 2018 2017 item in the statements of income  Gain (loss) on sale of AFS securities $ (25,480) $ — Securities transactions  Tax effect 5,720 — Income taxes  Net of tax (19,760) — Net income  Amortization of unrealized net loss on  securities transferred to HTM $ (3,296) $ (3,786) Interest income  Tax effect 755 1,393 Income taxes  Net of tax (2,541) (2,393) Net income  Amortization of defined benefit pension and  post-retirement items $ (4,989) $ (5,201) Other noninterest expense  Tax effect 1,122 1,898 Income taxes  Net of tax (3,867) (3,303) Net income  Reclassification of unrealized gain on cash flow hedges $ 1,072 $ — Interest income  Tax effect (244) — Income taxes  Net of tax 828 — Net income  Amortization of loss on terminated cash flow hedges (5,569) (600) Interest expense  Tax effect 1,269 232 Income taxes  Net of tax (4,300) (368) Net income  Total reclassifications, net of tax $ (30,468) $ (6,064) Net income  (a) Amounts in parenthesis indicate reduction in net income.
Compliance with Regulatory Capital Requirements	   Actual Required for Minimum Capital Adequacy Required To Be Well Capitalized  ($ in thousands) Amount Ratio % Amount Ratio % Amount Ratio %  At December 31, 2018  Tier 1 leverage capital  Hancock Whitney Corporation $ 2,391,762 8.67 $ 1,103,544 4.00 $ 1,379,430 5.00  Hancock Whitney Bank 2,351,090 8.54 1,101,372 4.00 1,376,715 5.00  Common equity tier 1 (to risk weighted assets)  Hancock Whitney Corporation $ 2,391,762 10.48 $ 1,026,637 4.50 $ 1,482,920 6.50  Hancock Whitney Bank 2,351,090 10.32 1,025,355 4.50 1,481,068 6.50  Tier 1 capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,391,762 10.48 $ 1,368,849 6.00 $ 1,825,132 8.00  Hancock Whitney Bank 2,351,090 10.32 1,367,140 6.00 1,822,853 8.00  Total capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,736,276 11.99 $ 1,825,132 8.00 $ 2,281,415 10.00  Hancock Whitney Bank 2,545,604 11.17 1,822,053 8.00 2,278,566 10.00  At December 31, 2017  Tier 1 leverage capital  Hancock Whitney Corporation $ 2,214,723 8.43 $ 1,051,025 4.00 $ 1,313,781 5.00  Hancock Whitney Bank 2,282,485 8.72 1,046,644 4.00 1,308,305 5.00  Common equity tier 1 (to risk weighted assets)  Hancock Whitney Corporation $ 2,214,723 10.21 $ 976,303 4.50 $ 1,410,216 6.50  Hancock Whitney Bank 2,282,485 10.54 974,362 4.50 1,407,412 6.50  Tier 1 capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,214,723 10.21 $ 1,301,738 6.00 $ 1,735,650 8.00  Hancock Whitney Bank 2,282,485 10.54 1,299,150 6.00 1,732,200 8.00  Total capital (to risk weighted assets)  Hancock Whitney Corporation $ 2,582,031 11.90 $ 1,735,650 8.00 $ 2,169,563 10.00  Hancock Whitney Bank 2,499,793 11.55 1,732,200 8.00 2,165,250 10.00 

Noninterest Income and Nonint_2

Noninterest Income and Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Noninterest Income and Noninterest Expense [Abstract]
Components of Other Noninterest Income and Other Noninterest Expense	   Years Ended December 31,  (in thousands) 2018 2017 2016  Other noninterest income:  Income from bank-owned life insurance $ 12,424 $ 11,473 $ 13,596  Credit-related fees 11,065 11,140 9,926  Other miscellaneous income 20,297 19,684 16,146  Total other noninterest income $ 43,786 $ 42,297 $ 39,668   Other noninterest expense:  Advertising $ 12,334 $ 15,031 $ 10,938  Corporate value and franchise taxes 13,595 12,797 8,741  Entertainment and contributions 11,359 8,260 7,122  Telecommunications and postage 14,659 14,686 13,146  Other retirement expense (18,661) (15,249) (10,496)  Other miscellaneous expense 47,407 46,548 45,313  Total other noninterest expense $ 80,693 $ 82,073 $ 74,764 

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Income Tax Expense	   Years Ended December 31,  (in thousands) 2018 2017 2016  Included in net income  Current federal $ 7,594 $ 38,859 $ 43,777  Current state 5,538 4,112 1,689  Total current provision 13,132 42,971 45,466  Deferred federal 41,078 48,653 (6,127)  Deferred state 4,136 1,178 (1,712)  Total deferred provision 45,214 49,831 (7,839)  Total included in net income $ 58,346 $ 92,802 $ 37,627 
Deferred Tax Assets and Liabilities	   December 31,  (in thousands) 2018 2017  Deferred tax assets:  Allowance for loan losses $ 45,198 $ 51,517  Employee compensation and benefits 12,796 9,783  Loan purchase accounting adjustments 1,132 6,441  Tax credit carryforward 2,059 21,274  Securities 17,390 12,250  State net operating loss 1,629 1,979  Other 18,431 13,763  Gross deferred tax assets 98,635 117,007  State valuation allowance (1,629) (1,979)  Net deferred tax assets 97,006 115,028  Deferred tax liabilities:  Fixed assets & intangibles (44,277) (42,597)  Lease financing (23,605) (12,285)  Other (6,157) (6,167)  Gross deferred tax liabilities (74,039) (61,049)  Net deferred tax asset $ 22,967 $ 53,979 
Effective Income Tax Rate Reconciliation	   Years Ended December 31,  2018 2017 2016  ($ in thousands) Amount % Amount % Amount %  Taxes computed at statutory rate $ 80,244 21.0 % $ 107,952 35.0 % $ 65,423 35.0 %  Increases (decreases) in taxes resulting from:  State income taxes, net of federal income  tax benefit 8,770 2.3 4,288 1.4 2,104 1.1  Tax-exempt interest (10,803) (2.8) (18,870) (6.1) (14,497) (7.8)  Bank owned life insurance (2,019) (0.5) (5,360) (1.7) (4,833) (2.6)  Tax credits (11,344) (3.0) (9,286) (3.1) (10,410) (5.6)  Employee share-based compensation (1,380) (0.3) (5,824) (1.9) — —  FDIC assessment disallowance 2,818 0.7 — — — —  Return to provision adjustment (9,942) (2.6) (120) — (549) (0.3)  Impact of deferred tax asset re-measurement — — 19,520 6.3 — —  Other, net 2,002 0.5 502 0.2 389 0.3  Income tax expense $ 58,346 15.3 % $ 92,802 30.1 % $ 37,627 20.1 % 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	   Years Ended December 31,  ($ in tho usands, except per share data ) 2018 2017 2016  Numerator:  Net income to common shareholders $ 323,770 $ 215,632 $ 149,296  Net income allocated to participating securities -- basic and diluted 5,930 4,670 3,598  Net income allocated to common shareholders - basic and diluted $ 317,840 $ 210,962 $ 145,698  Denominator:  Weighted-average common shares - basic 85,355 84,695 77,850  Dilutive potential common shares 166 268 99  Weighted average common shares - diluted 85,521 84,963 77,949  Earnings per common share:  Basic $ 3.72 $ 2.49 $ 1.87  Diluted $ 3.72 $ 2.48 $ 1.87 

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefit Plans [Abstract]
Changes in Benefit Obligations and Plan Assets	   2018 2017 2018 2017  (in thousands) Pension Benefits Other Post- Retirement Benefits  Change in benefit obligation  Benefit obligation:  at beginning of year $ 513,844 $ 479,281 $ 23,036 $ 22,481  Service cost 12,414 15,381 120 129  Interest cost 16,762 16,514 621 668  Plan participants' contributions — — 628 636  Plan amendments — (17,315) — —  Net actuarial gain (loss) (30,796) 39,419 (6,717) 993  Benefits paid (20,207) (19,436) (1,405) (1,871)  Benefit obligation, end of year 492,017 513,844 16,283 23,036  Change in plan assets  Fair value of plan assets:  at beginning of year 564,365 515,555 — —  Actual return on plan assets (40,491) 68,307 — —  Employer contributions 40,138 1,132 777 1,235  Plan participants' contributions — — 628 636  Benefit payments (20,207) (19,436) (1,405) (1,871)  Expenses (1,187) (1,193) — —  Fair value of plan assets, end of year 542,618 564,365 — —  Funded status at end of year - net asset (liability) $ 50,601 $ 50,521 $ (16,283) $ (23,036)  Amounts recognized in accumulated other comprehensive loss  Unrecognized loss:  at beginning of year $ 102,978 $ 115,910 $ (732) $ (2,078)  Net actuarial loss (gain) 46,492 (12,932) (6,283) 1,346  Unrecognized (gain) loss at end of year $ 149,470 $ 102,978 $ (7,015) $ (732)   Projected benefit obligation $ 492,017 $ 513,844  Accumulated benefit obligation 467,300 489,075  Fair value of plan assets 542,618 564,365 
Components of Net Periodic Benefits Cost	   Years Ended December 31,  2018 2017 2016 2018 2017 2016  ($ in thousands) Pension Benefits Other Post-Retirement Benefits  Net periodic benefit cost  Service cost $ 12,414 $ 15,381 $ 14,098 $ 120 $ 129 $ 170  Interest cost 16,762 16,514 16,907 621 668 773  Expected return on plan assets (41,033) (37,632) (34,554) — — —  Amortization of net loss/ prior service cost 5,423 5,554 5,783 (434) (353) 145  Net periodic benefit cost (6,434) (183) 2,234 307 444 1,088  Other changes in plan assets and benefit obligations recognized in other comprehensive income, before taxes  Net (loss) gain recognized during the year (5,423) (5,554) (5,783) 434 353 (145)  Net actuarial loss (gain) 51,915 (7,378) 12,128 (6,717) 993 620  Total recognized in other comprehensive income 46,492 (12,932) 6,345 (6,283) 1,346 475  Total recognized in net periodic benefit cost and other comprehensive income $ 40,058 $ (13,115) $ 8,579 $ (5,976) $ 1,790 $ 1,563   Discount rate for benefit obligations 4.14% 3.57% 4.10% 4.10% 3.52% 3.95%  Discount rate for net periodic benefit cost 3.57% 4.10% 4.40% 3.52% 3.95% 4.32%  Expected long-term return on plan assets 7.25% 7.25% 7.25% n/a n/a n/a  Rate of compensation increase scaled * scaled * scaled * n/a n/a n/a  * Graded scale, declining from 7.00% at age 20 to 2.00% at age 60
Expected Plan Benefit Payments	   (in thousands) Pension Post-Retirement Total  2019 $ 21,885 $ 1,036 $ 22,921  2020 23,009 1,037 24,046  2021 24,077 1,098 25,175  2022 25,168 1,030 26,198  2023 26,085 1,029 27,114  2024-2028 148,547 4,958 153,505  $ 268,771 $ 10,188 $ 278,959 
Assumed Health Care Cost Trend Rates	   1% Decrease Assumed 1% Increase  (in thousands) in Rates Rates in Rates  Aggregated service and interest cost $ 666 $ 741 $ 834  Postretirement benefit obligation 14,949 16,281 17,894 
Fair Values of Pension Plan Assets	   December 31, 2018  Fair Value Measurements by Asset Category / Fund Level 1 Level 2 Level 3 Total  (in thousands)  Cash and equivalents $ 8,643 $ — $ — $ 8,643  Total cash and cash equivalents 8,643 — — 8,643   Fixed income securities 19,856 97,025 — 116,881  Mutual fund-fixed income 31,556 — 145 31,701  Total fixed income 51,412 97,025 145 148,582   Domestic and foreign stock 80,813 6 — 80,819  Mutual funds-equity 150,466 — — 150,466  Total equity 231,279 6 — 231,285  Total assets at fair value 291,334 97,031 145 388,510  Common trust funds (fixed income) — — — 125,706  Common trust fund (real assets) — — — 28,402  Total $ 291,334 $ 97,031 $ 145 $ 542,619      December 31, 2017  Fair Value Measurements by Asset Category / Fund Level 1 Level 2 Level 3 Total  (in thousands)  Cash and equivalents $ 5,496 $ — $ — $ 5,496  Total cash and cash equivalents 5,496 — — 5,496   Fixed income securities — 113,169 162 113,331  Mutual fund-fixed income 31,839 — — 31,839  Total fixed income 31,839 113,169 162 145,170   Domestic and foreign stock 102,416 6 — 102,422  Mutual funds-equity 168,299 — — 168,299  Total equity 270,715 6 — 270,721  Total assets at fair value 308,050 113,175 162 421,387  Common trust funds (fixed income) — — — 114,068  Common trust fund (real assets) — — — 28,910  Total $ 308,050 $ 113,175 $ — $ 564,365 
Percentage and Target Allocations	  Plan Assets Target Allocation  at December 31, at December 31,  Asset category 2018 2017 2018 2017  Cash and equivalents 1 % 1 % 0 - 5% 0 - 5%  Fixed income securities 51 46 35 - 63% 35 - 63%  Equity securities 43 48 35 - 51% 35 - 51%  Real assets 5 5 0 - 12% 0 - 12%  100 % 100 % 

Share-Based Payment Arrangeme_2

Share-Based Payment Arrangements (Tables)	12 Months Ended
	Dec. 31, 2018
Share-Based Payment Arrangements [Abstract]
Summary of Option Activity	   Options Number of Shares Weighted- Average Exercise Price ($) Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value ($000)  Outstanding at January 1, 2018 88,301 $ 34.84 2.8 $ 1,294  Exercised (35,317) 37.39 592  Expired (6,119) 42.82 10  Outstanding at December 31, 2018 46,865 $ 31.88 2.6 $ 164  Exercisable at December 31, 2018 46,685 $ 31.88 2.6 $ 164 
Summary of Nonvested Restricted and Performance Shares	   Number of Shares Weighted- Average Grant-Date Fair Value ($)  Nonvested at January 1, 2018 1,708,942 $ 37.05  Granted 647,376 39.70  Vested (792,084) 33.94  Cancelled/Forfeited (70,193) 36.13  Nonvested at December 31, 2018 1,494,041 $ 39.89 

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies [Abstract]
Off-Balance Sheet Financial Instruments	   December 31,  (in thousands) 2018 2017  Commitments to extend credit $ 7,234,528 $ 6,689,033  Letters of credit 365,498 348,377 
Future Minimum Lease Payments for Non-Cancelable Operating Leases	   (in thousands) Operating Leases  2019 $ 18,476  2020 17,059  2021 15,780  2022 15,506  2023 14,373  Thereafter 101,402  Total minimum lease payments $ 182,596 

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value of Financial Instruments [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	   December 31, 2018  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 71,706 $ — $ 71,706  Municipal obligations — 240,427 — 240,427  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,443,402 — 1,443,402  Commercial mortgage-backed securities — 770,077 — 770,077  Collateralized mortgage obligations — 161,925 — 161,925  Total available for sale securities — 2,691,037 — 2,691,037  Derivative assets (1) — 16,980 — 16,980  Total recurring fair value measurements - assets $ — $ 2,708,017 $ — $ 2,708,017  Liabilities — —  Derivative liabilities (1) $ — $ 14,923 $ 7,304 $ 22,227  Total recurring fair value measurements - liabilities $ — $ 14,923 $ 7,304 $ 22,227  (1) For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.      December 31, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Assets  Available for sale debt securities:  U.S. Treasury and government agency securities $ — $ 97,272 $ — $ 97,272  Municipal obligations — 243,786 — 243,786  Corporate debt securities — 3,500 — 3,500  Residential mortgage-backed securities — 1,715,213 — 1,715,213  Commercial mortgage-backed securities — 687,135 — 687,135  Collateralized mortgage obligations — 163,963 — 163,963  Total available for sale securities — 2,910,869 — 2,910,869  Derivative assets (1) — 14,157 — 14,157  Total recurring fair value measurements - assets $ — 2,925,026 $ — 2,925,026  Liabilities —  Derivative liabilities (1) $ — $ 14,389 $ — $ 14,389  Total recurring fair value measurements - liabilities $ — $ 14,389 $ — $ 14,389  (1) For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.
Schedule of Level 3 Fair Value Rollforward	  Beginning balance $ -  Entry into derivative contract 7,304  Ending balance $ 7,304 
Overview of the Valuation Techniques and Significant Unobservable Inputs	  Level 3 Class Fair Value at December 31, 2018 Valuation Technique Unobservable Input Values Utilized  VISA Class A Appreciation 6.0% - 18.0%  Other derivative liability $ 7,304 Discounted cash flow Conversion rate 1.62x - 1.59x  Time until resolution 24 - 48 months 
Financial Assets Measured at Fair Value on Nonrecurring Basis	 December 31, 2018  (in thousands) Level 1 Level 2 Level 3 Total  Collateral dependent impaired loans $ — $ 170,918 $ — $ 170,918  Other real estate and foreclosed assets, net — — 14,594 14,594  Total nonrecurring fair value measurements $ — $ 170,918 $ 14,594 $ 185,512      December 31, 2017  (in thousands) Level 1 Level 2 Level 3 Total  Collateral dependent impaired loans $ — $ 184,205 $ — $ 184,205  Other real estate and foreclosed assets, net — — 19,608 19,608  Total nonrecurring fair value measurements $ — $ 184,205 $ 19,608 $ 203,813 
Estimated Fair Values of Financial Instruments	   December 31, 2018  Total Carrying  (in thousands) Level 1 Level 2 Level 3 Fair Value Amount  Financial assets:  Cash, interest-bearing bank  deposits, and federal funds sold $ 494,466 $ — $ — $ 494,466 $ 494,466  Available for sale securities — 2,691,037 — 2,691,037 2,691,037  Held to maturity securities — 2,935,856 — 2,935,856 2,979,547  Loans, net — 170,918 19,555,969 19,726,887 19,831,897  Loans held for sale — 28,150 — 28,150 28,150  Derivative financial instruments — 16,980 — 16,980 16,980  Financial liabilities:  Deposits $ — $ — $ 23,129,574 $ 23,129,574 $ 23,150,185  Federal funds purchased 425 — — 425 425  Securities sold under agreements  to repurchase 428,599 — — 428,599 428,599  Short-term FHLB Borrowings 1,160,104 — — 1,160,104 1,160,104  Long-term debt — 223,135 — 223,135 224,993  Derivative financial instruments — 14,923 7,304 22,227 22,227                    December 31, 2017  Total Carrying  (in thousands) Level 1 Level 2 Level 3 Fair Value Amount  Financial assets:  Cash, interest-bearing bank  deposits, and federal funds sold $ 479,332 $ — $ — $ 479,332 $ 479,332  Available for sale securities — 2,910,869 — 2,910,869 2,910,869  Held to maturity securities — 2,962,010 — 2,962,010 2,977,511  Loans, net — 184,205 18,403,303 18,587,508 18,786,855  Loans held for sale — 39,865 — 39,865 39,865  Derivative financial instruments — 14,157 — 14,157 14,157  Financial liabilities:  Deposits $ — $ — $ 22,238,847 $ 22,238,847 $ 22,253,202  Federal funds purchased 140,754 — — 140,754 140,754  Securities sold under agreements  to repurchase 430,569 — — 430,569 430,569  FHLB Borrowings 1,132,567 — — 1,132,567 1,132,567  Long-term debt — 303,631 — 303,631 305,513  Derivative financial instruments — 14,389 — 14,389 14,389 

Condensed Parent Company Info_2

Condensed Parent Company Information (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Parent Company Information [Abstract]
Condensed Balance Sheets	   December 31,  (in thousands) 2018 2017  Assets:  Cash $ 153,939 $ 71,328  Securities available for sale — 58,521  Investment in bank subsidiaries 3,040,186 2,953,032  Investment in non-bank subsidiaries 26,274 22,670  Due from subsidiaries and other assets 6,868 14,010  $ 3,227,267 $ 3,119,561  Liabilities and Stockholders' Equity:  Long term debt $ 145,396 $ 234,135  Other liabilities 531 477  Stockholders' equity 3,081,340 2,884,949  $ 3,227,267 $ 3,119,561 
Condensed Statements of Income	   Years Ended December 31,  (in thousands) 2018 2017 2016  Operating Income  From subsidiaries  Cash dividends received from bank subsidiaries $ 200,000 $ 90,000 $ 120,000  Noncash dividend from bank subsidiaries — 11,708 —  Equity in earnings of subsidiaries greater than  dividends received 137,914 124,531 39,293  Total operating income 337,914 226,239 159,293  Other expense, net (18,728) (16,931) (16,614)  Income tax benefit (4,584) (6,324) (6,617)  Net income $ 323,770 $ 215,632 $ 149,296  Other comprehensive income (loss), net of tax (46,307) 11,460 (39,937)  Comprehensive income $ 277,463 $ 227,092 $ 109,359 
Condensed Statements of Cash Flows	   Years Ended December 31,  (in thousands) 2018 2017 2016  Cash flows from operating activities - principally  dividends received from subsidiaries $ 216,270 $ 111,591 $ 122,528  Net cash provided by operating activities 216,270 111,591 122,528  Cash flows from investing activities  Contribution of capital to subsidiary — (270,000) (21,000)  Proceeds from sale of securities available for sale 47,557 — —  Proceeds from principal paydowns of securities available for sale 9,091 11,015 13,827  Net cash provided by (used in) investing activities 56,648 (258,985) (7,173)  Cash flows from financing activities:  Repayment of long term debt (89,200) (17,900) (17,900)  Dividends paid to stockholders (88,838) (83,266) (77,012)  Repurchase of common stock (8,267) — —  Proceeds from issuance of common stock 4,693 15,312 262,961  Payroll tax remitted on net share settlement of equity awards (8,695) (11,881) (3,178)  Other, net — — (133)  Net cash provided by (used in) financing activities (190,307) (97,735) 164,738  Net increase (decrease) in cash 82,611 (245,129) 280,093  Cash, beginning of year 71,328 316,457 36,364  Cash, end of year $ 153,939 $ 71,328 $ 316,457 

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Maximum refinement period of fair values after closing date of acquisition	1 year
Loan minimum balance included in specific reseve analysis	$ 1,000,000
Tax credit carry forward period	20 years
Reclassification of certain tax effects from accumulated other comprehensive loss
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Operating Lease, Right-of-Use Asset	$ 116,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:Assets
Operating Lease, Liability	$ 131,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:Liabilities
Deferred rent liabilities	$ 15,000,000
Federal NMTC Investment [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Tax credit earning period	7 years
State NMTC Investment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Tax credit earning period	3 years
State NMTC Investment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Tax credit earning period	5 years
Low Income Housing Credit Investments [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Tax credit earning period	10 years
Buildings [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Estimated useful lives of assets	30 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Estimated useful lives of assets	3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Estimated useful lives of assets	10 years
Software [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Amortization Expense Charged Off Period	3 years
Core Systems [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Amortization Expense Charged Off Period	7 years
Commercial Loans [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Loss emergence periods	24 months
Retail Loans [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Loss emergence periods	12 months
Residential Mortgages Loans [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Loss emergence periods	18 months

Acquisitions and Divestiture (N

Acquisitions and Divestiture (Narrative) (Details) $ in Thousands	Mar. 09, 2018USD ($)	Apr. 28, 2017USD ($)	Mar. 10, 2017USD ($)entity	Dec. 31, 2018USD ($)	Jul. 13, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Total Loans					$ 10,400,000
Useful life				17 years
Unpaid principal balance				$ 308,401		$ 341,713
Recorded investment without an allowance				161,227		147,055
Recorded investment with an allowance				107,528		170,142
Short-term borrowings				1,589,128		1,703,890
Long-term debt				224,993		305,513
Hancock Whitney Bank [Member]
Business Acquisition [Line Items]
Net of cash acquired			$ 323,000
Cash consideration			326,000
Cash acquired			3,000
Acquisition, Premium amount to pay			41,600
FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings				1,160,104		1,132,567
Harrison Finance Company [Member]
Business Acquisition [Line Items]
Loss from sale of consumer finance subsidiary	$ 1,100
Proceeds from sale of finance subsidiary	$ 78,900
Capital One [Member]
Business Acquisition [Line Items]
Identifiable intangible assets				27,562
Acquisition, debt assumed				151
Total Loans				4,000,000
Liabilities assumed				217,583
Cash for customer deposit liabilities assumed					$ 217,000
FNBC Transactions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets				25,300		25,300
Fair value discount				41,000
Acquisition, debt assumed						4,686
Total Loans						1,368,669
Unpaid principal balance of the loans acquired				1,400,000
Liabilities assumed						$ 2,622,950
Estimated uncollectible amount				31,700
Unpaid principal balance				39,900
Recorded investment without an allowance				24,900
Recorded investment with an allowance				$ 15,000
FNBC I [Member]
Business Acquisition [Line Items]
Identifiable intangible assets			3,900
Acquisition, debt assumed			1,607
Total Loans			1,203,092
Useful life				8 years
Liabilities assumed			$ 1,003,647
FNBC I [Member] | Hancock Whitney Bank [Member]
Business Acquisition [Line Items]
Number of branches | entity			9
FNBC I [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Liabilities assumed				$ 690,000
FNBC I [Member] | Variable-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings				460,000
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Long-term debt				93,100
FNBC I [Member] | Fixed-rate Term Notes [Member] | FHLB Borrowings [Member]
Business Acquisition [Line Items]
Short-term borrowings				$ 51,000
FNBC II [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 21,400
Acquisition, debt assumed		3,079
Total Loans		165,577
Useful life				11 years
Liabilities assumed		1,619,303
FNBC II [Member] | Hancock Whitney Bank [Member]
Business Acquisition [Line Items]
Cash received		800,000
Cash acquired		158,000
Premium payment		35,000
Unpaid principal balance of the loans acquired, Net liabilities assumed		$ 642,000
Trust And Asset Management Acquisition [Member]
Business Acquisition [Line Items]
Trust fee revenue				$ 10,500
Related expense				$ 7,300

Acquisitions and Divestiture (S

Acquisitions and Divestiture (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed – Capital One) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 790,972	$ 745,523	$ 621,193
Capital One [Member]
Business Acquisition [Line Items]
Accounts receivable	2,803
Identifiable intangible assets	27,562
Total identifiable assets	30,365
Deposit liabilities	217,432
Other liabilities	151
Total liabilities	217,583
Net identifiable assets acquired (liabilities assumed)	(187,218)
Consideration received	141,769
Goodwill	$ 45,449

Acquisitions and Divestiture _2

Acquisitions and Divestiture (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed - FNBC) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jul. 13, 2018	Dec. 31, 2017	Apr. 28, 2017	Mar. 10, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total Loans		$ 10,400,000
Goodwill	$ 790,972		$ 745,523			$ 621,193
FNBC Transactions [Member]
Business Acquisition [Line Items]
Cash and due from banks			160,788
Interest-bearing time deposits with other banks			382,622
Fed funds sold and other short-term investments			148
Securities			213,877
Total Loans			1,368,669
Property and equipment			20,934
Accrued interest receivable			4,028
Identifiable intangible assets	$ 25,300		25,300
Deferred tax asset			2,220
Other assets			4,213
Total identifiable assets			2,182,799
Deposits			1,928,509
Short-term borrowings			596,635
Long-term debt			93,120
Other liabilities			4,686
Total liabilities			2,622,950
Net identifiable assets acquired (liabilities assumed)			(440,151)
Consideration (Paid) Received			315,821
Goodwill			$ 124,330
FNBC I [Member]
Business Acquisition [Line Items]
Cash and due from banks					$ 2,856
Total Loans					1,203,092
Property and equipment					11,946
Accrued interest receivable					3,143
Identifiable intangible assets					3,900
Deferred tax asset					856
Other assets					63
Total identifiable assets					1,225,856
Deposits					398,171
Short-term borrowings					510,749
Long-term debt					93,120
Other liabilities					1,607
Total liabilities					1,003,647
Net identifiable assets acquired (liabilities assumed)					222,209
Consideration (Paid) Received					(325,756)
Goodwill					$ 103,547
FNBC II [Member]
Business Acquisition [Line Items]
Cash and due from banks				$ 157,932
Interest-bearing time deposits with other banks				382,622
Fed funds sold and other short-term investments				148
Securities				213,877
Total Loans				165,577
Property and equipment				8,988
Accrued interest receivable				885
Identifiable intangible assets				21,400
Deferred tax asset				1,364
Other assets				4,150
Total identifiable assets				956,943
Deposits				1,530,338
Short-term borrowings				85,886
Other liabilities				3,079
Total liabilities				1,619,303
Net identifiable assets acquired (liabilities assumed)				(662,360)
Consideration (Paid) Received				641,577
Goodwill				$ 20,783

Acquisitions and Divestiture _3

Acquisitions and Divestiture (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill, Beginning Balance	$ 745,523	$ 621,193
Goodwill, Ending Balance	790,972	745,523
FNBC Transactions [Member]
Business Acquisition [Line Items]
Goodwill, Beginning Balance	124,330
Goodwill, Ending Balance		124,330
FNBC I [Member]
Business Acquisition [Line Items]
Goodwill, Initial goodwill recorded		95,568
Goodwill, Measurement period adjustments		7,979
FNBC II [Member]
Business Acquisition [Line Items]
Goodwill, Initial goodwill recorded		23,009
Goodwill, Measurement period adjustments		$ (2,226)
Trust And Asset Management Acquisition [Member]
Business Acquisition [Line Items]
Goodwill, Initial goodwill recorded	45,634
Goodwill, Measurement period adjustments	$ (185)

Acquisitions and Divestiture _4

Acquisitions and Divestiture (Schedule of Merger-Related Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
FNBC Transactions [Member]
Business Acquisition [Line Items]
Personnel expense	$ 1,257
Net occupancy and equipment expense	309
Professional services expense	2,827
Data processing expense	1,583
Advertising expense	52
Other expense	159
Total merger-related expenses	$ 6,187
Trust And Asset Management Acquisition [Member]
Business Acquisition [Line Items]
Personnel expense		$ 3,662
Net occupancy and equipment expense		777
Professional services expense		9,681
Data processing expense		974
Other real estate		(1,511)
Advertising expense		1,389
Other expense		4,398
Total merger-related expenses		$ 19,370

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Securities [Abstract]
Securities classified as trading	$ 0	$ 0
Securities pledged as collateral	$ 3,400,000,000	$ 3,300,000,000

Securities (Amortized Cost and

Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,755,806	$ 2,949,057
Securities Available for Sale, Gross Unrealized Gains	7,500	7,230
Securities Available for Sale, Gross Unrealized Losses	72,269	45,418
Securities Available for Sale, Fair Value	2,691,037	2,910,869
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	74,339	99,535
Securities Available for Sale, Gross Unrealized Losses	2,633	2,263
Securities Available for Sale, Fair Value	71,706	97,272
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	246,713	245,997
Securities Available for Sale, Gross Unrealized Gains	360	1,135
Securities Available for Sale, Gross Unrealized Losses	6,646	3,346
Securities Available for Sale, Fair Value	240,427	243,786
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,468,912	1,729,989
Securities Available for Sale, Gross Unrealized Gains	4,284	5,611
Securities Available for Sale, Gross Unrealized Losses	29,794	20,387
Securities Available for Sale, Fair Value	1,443,402	1,715,213
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	799,060	704,518
Securities Available for Sale, Gross Unrealized Gains	1,953	480
Securities Available for Sale, Gross Unrealized Losses	30,936	17,863
Securities Available for Sale, Fair Value	770,077	687,135
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	163,282	165,518
Securities Available for Sale, Gross Unrealized Gains	903	4
Securities Available for Sale, Gross Unrealized Losses	2,260	1,559
Securities Available for Sale, Fair Value	161,925	163,963
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	3,500	3,500
Securities Available for Sale, Fair Value	$ 3,500	$ 3,500

Securities (Amortized Cost an_2

Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	$ 2,979,547	$ 2,977,511
Securities Held to Maturity, Gross Unrealized Gains	5,782	13,110
Securities Held to Maturity, Gross Unrealized Losses	49,473	28,611
Securities Held to Maturity, Fair Value	2,935,856	2,962,010
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	50,000	50,000
Securities Held to Maturity, Gross Unrealized Losses	478	289
Securities Held to Maturity, Fair Value	49,522	49,711
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	688,201	723,094
Securities Held to Maturity, Gross Unrealized Gains	2,347	8,323
Securities Held to Maturity, Gross Unrealized Losses	9,503	4,245
Securities Held to Maturity, Fair Value	681,045	727,172
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	640,393	725,748
Securities Held to Maturity, Gross Unrealized Gains	1,461	4,175
Securities Held to Maturity, Gross Unrealized Losses	6,117	2,690
Securities Held to Maturity, Fair Value	635,737	727,233
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	357,175	317,185
Securities Held to Maturity, Gross Unrealized Gains	376	40
Securities Held to Maturity, Gross Unrealized Losses	10,882	3,915
Securities Held to Maturity, Fair Value	346,669	313,310
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	1,243,778	1,161,484
Securities Held to Maturity, Gross Unrealized Gains	1,598	572
Securities Held to Maturity, Gross Unrealized Losses	22,493	17,472
Securities Held to Maturity, Fair Value	$ 1,222,883	$ 1,144,584

Securities (Amortized Cost an_3

Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 1,862
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	105,364
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	1,200,188
Debt Securities Available for Sale, Due after ten years, Amortized Cost	1,448,392
Total available for sale debt securities, Amortized Cost	2,755,806
Debt Securities Available for Sale, Due in one year or less, Fair Value	1,868
Debt Securities Available for Sale, Due after one year through five years, Fair Value	106,255
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	1,163,870
Debt Securities Available for Sale, Due after ten years, Fair Value	1,419,044
Total available for sale debt securities, Fair Value	2,691,037
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	18,654
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	127,861
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	1,425,846
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	1,407,186
Total held to maturity debt securities, Amortized Cost	2,979,547	$ 2,977,511
Debt Securities Held to Maturity, Due in one year or less, Fair Value	18,676
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	126,495
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	1,405,836
Debt Securities Held to Maturity, Due after ten years, Fair Value	1,384,849
Total held to maturity debt securities, Fair Value	$ 2,935,856	$ 2,962,010

Securities (Securities Availabl

Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 442,773	$ 842,011
Available for sale, Losses less than 12 months, Gross Unrealized Losses	4,928	6,319
Available for sale, Losses 12 months or longer, Fair Value	1,687,704	1,569,320
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	67,340	39,099
Available for sale, Total, Fair Value	2,130,477	2,411,331
Available for sale, Total, Gross Unrealized Losses	72,268	45,418
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		45,616
Available for sale, Losses less than 12 months, Gross Unrealized Losses		42
Available for sale, Losses 12 months or longer, Fair Value	71,706	51,157
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	2,633	2,221
Available for sale, Total, Fair Value	71,706	96,773
Available for sale, Total, Gross Unrealized Losses	2,633	2,263
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	41,203	2,768
Available for sale, Losses less than 12 months, Gross Unrealized Losses	591	11
Available for sale, Losses 12 months or longer, Fair Value	170,883	173,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	6,054	3,335
Available for sale, Total, Fair Value	212,086	176,298
Available for sale, Total, Gross Unrealized Losses	6,645	3,346
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	305,090	461,835
Available for sale, Losses less than 12 months, Gross Unrealized Losses	2,485	4,195
Available for sale, Losses 12 months or longer, Fair Value	762,826	898,099
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	27,309	16,192
Available for sale, Total, Fair Value	1,067,916	1,359,934
Available for sale, Total, Gross Unrealized Losses	29,794	20,387
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	96,226	203,618
Available for sale, Losses less than 12 months, Gross Unrealized Losses	1,851	995
Available for sale, Losses 12 months or longer, Fair Value	570,485	411,046
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	29,085	16,868
Available for sale, Total, Fair Value	666,711	614,664
Available for sale, Total, Gross Unrealized Losses	30,936	17,863
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	254	128,174
Available for sale, Losses less than 12 months, Gross Unrealized Losses	1	1,076
Available for sale, Losses 12 months or longer, Fair Value	111,804	35,488
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	2,259	483
Available for sale, Total, Fair Value	112,058	163,662
Available for sale, Total, Gross Unrealized Losses	$ 2,260	$ 1,559

Securities (Securities Held to

Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 401,593	$ 768,589
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,660	6,515
Held to maturity, Losses 12 months or longer, Fair Value	1,720,624	1,055,983
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	46,813	22,096
Held to maturity, Total, Fair Value	2,122,217	1,824,572
Held to maturity, Total, Gross Unrealized Losses	49,473	28,611
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses 12 months or longer, Fair Value	49,521	49,711
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	478	289
Held to maturity, Total, Fair Value	49,521	49,711
Held to maturity, Total, Gross Unrealized Losses	478	289
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	233,469	14,603
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,256	19
Held to maturity, Losses 12 months or longer, Fair Value	233,280	230,960
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	7,247	4,226
Held to maturity, Total, Fair Value	466,749	245,563
Held to maturity, Total, Gross Unrealized Losses	9,503	4,245
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	90,730	8,815
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	123	99
Held to maturity, Losses 12 months or longer, Fair Value	235,251	230,277
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	5,994	2,591
Held to maturity, Total, Fair Value	325,981	239,092
Held to maturity, Total, Gross Unrealized Losses	6,117	2,690
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		174,882
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		744
Held to maturity, Losses 12 months or longer, Fair Value	305,419	72,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	10,882	3,171
Held to maturity, Total, Fair Value	305,419	247,381
Held to maturity, Total, Gross Unrealized Losses	10,882	3,915
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	77,394	570,289
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	281	5,653
Held to maturity, Losses 12 months or longer, Fair Value	897,153	472,536
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	22,212	11,819
Held to maturity, Total, Fair Value	974,547	1,042,825
Held to maturity, Total, Gross Unrealized Losses	$ 22,493	$ 17,472

Securities (Proceeds from and G

Securities (Proceeds from and Gross Losses on Sale of Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Securities [Abstract]
Proceeds	$ 455,162	$ 213,877	$ 173,215
Gross gains			1,965
Gross losses	$ 25,480		$ (211)

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)agreementloan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 187,295	$ 252,800
TDRs both accruing and nonaccruing	224,600	219,700
Post-Modification outstanding recorded investment	94,760	177,070	$ 132,234
Recorded investment		20,800
Unfunded commitment to borrowers related to modified TDR	2,100	7,300
TDRs and loans impaired with minimum aggregate relationship balances	1,000
Related party balances of loans	37,500	33,600
Related party new loans	16,300
Related party repayments	12,300
Short-term borrowings	1,589,128	1,703,890
FHLB Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term borrowings	1,160,104	1,132,567
Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	85,500	$ 99,200
Number of TDRs subsequently defaulted | loan		0
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification outstanding recorded investment	50,800	$ 98,100	108,900
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Convenant waivers	14,600	76,200	22,800
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other modifications	29,400	2,800	$ 500
FDIC Loss Share Agreement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loss share agreements | agreement			1
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	16,744	15,087
Post-Modification outstanding recorded investment	$ 455	40
Number of TDRs subsequently defaulted | loan	1
Real estate in process of foreclosure	$ 7,100	7,500
Real estate acquired through foreclosure	1,800	3,400
Consumer [Member] | Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment	100
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	35,866	40,480
Post-Modification outstanding recorded investment	1,297	$ 2,812	$ 694
Residential Mortgages [Member] | Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs subsequently defaulted | loan			1
Recorded investment	$ 200
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs subsequently defaulted | loan			4
Commercial Real Estate - Owner Occupied [Member] | Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs subsequently defaulted | loan	1
Recorded investment	$ 1,800

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 20,026,411	$ 19,004,163
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,910,081	2,690,472
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,147,867	2,115,295
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,341,779	2,384,599
Construction and Land Development [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,548,335	1,373,421
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,078,349	10,440,376
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,620,601	8,297,937
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,457,748	$ 2,142,439

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses (Allowance for Loan Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 217,308	$ 229,418
Allowance for loan losses: Net provision for loan losses	36,116	58,968	$ 110,659
Allowance for loan losses: Ending balance	194,514	217,308	229,418
Allowance for loan losses: Individually evaluated for impairment	5,114	18,566
Allowance for loan losses: Amounts related to purchased credit impaired loans	10,734	14,107
Allowance for loan losses: Collectively evaluated for impairment	178,666	184,635
Loans: Individually evaluated for impairment	268,755	317,197
Loans: Purchased credit impaired loans	129,596	147,537
Loans: Collectively evaluated for impairment	19,628,060	18,539,429
Loans receivable	20,026,411	19,004,163
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	13,709	13,509
Allowance for loan losses: Ending balance	17,638	13,709	13,509
Allowance for loan losses: Individually evaluated for impairment	210	1,326
Allowance for loan losses: Amounts related to purchased credit impaired loans	43	41
Allowance for loan losses: Collectively evaluated for impairment	17,385	12,342
Loans: Individually evaluated for impairment	2,701	15,530
Loans: Purchased credit impaired loans	3,757	2,742
Loans: Collectively evaluated for impairment	2,335,321	2,366,327
Loans receivable	2,341,779	2,384,599
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	7,372	6,271
Allowance for loan losses: Ending balance	15,647	7,372	6,271
Allowance for loan losses: Individually evaluated for impairment	1	11
Allowance for loan losses: Amounts related to purchased credit impaired loans	83	172
Allowance for loan losses: Collectively evaluated for impairment	15,563	7,189
Loans: Individually evaluated for impairment	121	363
Loans: Purchased credit impaired loans	3,387	5,829
Loans: Collectively evaluated for impairment	1,544,827	1,367,229
Loans receivable	1,548,335	1,373,421
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	24,844	25,361
Allowance for loan losses: Ending balance	23,782	24,844	25,361
Allowance for loan losses: Individually evaluated for impairment	444	189
Allowance for loan losses: Amounts related to purchased credit impaired loans	9,766	12,258
Allowance for loan losses: Collectively evaluated for impairment	13,572	12,397
Loans: Individually evaluated for impairment	3,876	10,640
Loans: Purchased credit impaired loans	105,430	119,553
Loans: Collectively evaluated for impairment	2,800,775	2,560,279
Loans receivable	2,910,081	2,690,472
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	30,503	26,142
Allowance for loan losses: Ending balance	25,938	30,503	26,142
Allowance for loan losses: Individually evaluated for impairment	216	118
Allowance for loan losses: Amounts related to purchased credit impaired loans	388	646
Allowance for loan losses: Collectively evaluated for impairment	25,334	29,739
Loans: Individually evaluated for impairment	1,007	1,292
Loans: Purchased credit impaired loans	4,181	6,178
Loans: Collectively evaluated for impairment	2,142,679	2,107,825
Loans receivable	2,147,867	2,115,295
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(74,622)	(87,261)
Allowance for loan losses: Recoveries	22,360	18,709
Allowance for loan losses: Net provision for loan losses	36,116	58,968
Allowance for loan losses: Other	(6,648)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable		(2,526)
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(1,633)	(259)
Allowance for loan losses: Recoveries	221	988
Allowance for loan losses: Net provision for loan losses	5,341	(529)
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(334)	(696)
Allowance for loan losses: Recoveries	96	1,603
Allowance for loan losses: Net provision for loan losses	8,513	194
Non-Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(614)	(2,839)
Allowance for loan losses: Recoveries	2,179	1,064
Allowance for loan losses: Net provision for loan losses	(2,627)	3,602
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable		(2,344)
Non-Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(23,913)	(31,430)
Allowance for loan losses: Recoveries	5,162	6,680
Allowance for loan losses: Net provision for loan losses	20,834	29,246
Allowance for loan losses: Other	(6,648)
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable		(135)
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	140,880	158,135
Allowance for loan losses: Ending balance	111,509	140,880	158,135
Allowance for loan losses: Individually evaluated for impairment	4,243	16,922
Allowance for loan losses: Amounts related to purchased credit impaired loans	454	990
Allowance for loan losses: Collectively evaluated for impairment	106,812	122,968
Loans: Individually evaluated for impairment	261,050	289,372
Loans: Purchased credit impaired loans	12,841	13,235
Loans: Collectively evaluated for impairment	10,804,458	10,137,769
Loans receivable	11,078,349	10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	127,918	147,052
Allowance for loan losses: Ending balance	97,752	127,918	147,052
Allowance for loan losses: Individually evaluated for impairment	3,636	16,129
Allowance for loan losses: Amounts related to purchased credit impaired loans	239	525
Allowance for loan losses: Collectively evaluated for impairment	93,877	111,264
Loans: Individually evaluated for impairment	239,384	267,881
Loans: Purchased credit impaired loans	6,629	5,941
Loans: Collectively evaluated for impairment	8,374,588	8,024,115
Loans receivable	8,620,601	8,297,937
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	12,962	11,083
Allowance for loan losses: Ending balance	13,757	12,962	$ 11,083
Allowance for loan losses: Individually evaluated for impairment	607	793
Allowance for loan losses: Amounts related to purchased credit impaired loans	215	465
Allowance for loan losses: Collectively evaluated for impairment	12,935	11,704
Loans: Individually evaluated for impairment	21,666	21,491
Loans: Purchased credit impaired loans	6,212	7,294
Loans: Collectively evaluated for impairment	2,429,870	2,113,654
Loans receivable	2,457,748	2,142,439
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(48,128)	(52,037)
Allowance for loan losses: Recoveries	14,702	8,374
Allowance for loan losses: Net provision for loan losses	4,055	26,455
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable		(47)
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(40,069)	(51,479)
Allowance for loan losses: Recoveries	14,385	7,526
Allowance for loan losses: Net provision for loan losses	(4,482)	24,866
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable		(47)
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(8,059)	(558)
Allowance for loan losses: Recoveries	317	848
Allowance for loan losses: Net provision for loan losses	$ 8,537	$ 1,589

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 187,295	$ 252,800
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,991	14,574
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,146	3,807
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	35,866	40,480
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	16,744	15,087
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	127,548	178,852
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	110,653	152,863
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 16,895	$ 25,989

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	56	78	47
Pre-Modification Outstanding Recorded Investment	$ 94,760	$ 177,070	$ 132,234
Post-Modification Outstanding Recorded Investment	$ 94,760	$ 177,070	$ 132,234
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	5	1
Pre-Modification Outstanding Recorded Investment	$ 1,564	$ 5,625	$ 2,943
Post-Modification Outstanding Recorded Investment	$ 1,564	$ 5,625	$ 2,943
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	14	15	7
Pre-Modification Outstanding Recorded Investment	$ 1,297	$ 2,812	$ 694
Post-Modification Outstanding Recorded Investment	$ 1,297	$ 2,812	$ 694
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	10	1
Pre-Modification Outstanding Recorded Investment	$ 455	$ 40
Post-Modification Outstanding Recorded Investment	$ 455	$ 40
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	31	57	39
Pre-Modification Outstanding Recorded Investment	$ 91,444	$ 168,593	$ 128,597
Post-Modification Outstanding Recorded Investment	$ 91,444	$ 168,593	$ 128,597
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	29	52	38
Pre-Modification Outstanding Recorded Investment	$ 85,306	$ 162,909	$ 128,449
Post-Modification Outstanding Recorded Investment	$ 85,306	$ 162,909	$ 128,449
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	5	1
Pre-Modification Outstanding Recorded Investment	$ 6,138	$ 5,684	$ 148
Post-Modification Outstanding Recorded Investment	$ 6,138	$ 5,684	$ 148

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	$ 161,227	$ 147,055
Recorded investment with an allowance	107,528	170,142
Unpaid principal balance	308,401	341,713
Related allowance	5,114	18,566
Average recorded investment	327,183	286,536
Interest income recognized	8,390	3,015
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	1,138	5,101
Recorded investment with an allowance	1,563	10,429
Unpaid principal balance	3,428	15,687
Related allowance	210	1,326
Average recorded investment	9,155	14,565
Interest income recognized	71	146
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	100	100
Recorded investment with an allowance	21	263
Unpaid principal balance	121	363
Related allowance	1	11
Average recorded investment	145	1,018
Interest income recognized		2
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	2,058	8,245
Recorded investment with an allowance	1,818	2,395
Unpaid principal balance	4,421	13,855
Related allowance	444	189
Average recorded investment	5,598	5,784
Interest income recognized	18	18
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	279
Recorded investment with an allowance	728	1,292
Unpaid principal balance	1,253	1,294
Related allowance	216	118
Average recorded investment	814	1,558
Interest income recognized	39	13
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	157,652	133,609
Recorded investment with an allowance	103,398	155,763
Unpaid principal balance	299,178	310,514
Related allowance	4,243	16,922
Average recorded investment	311,471	263,611
Interest income recognized	8,262	2,836
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	144,625	116,682
Recorded investment with an allowance	94,759	151,199
Unpaid principal balance	273,290	285,685
Related allowance	3,636	16,129
Average recorded investment	286,146	255,710
Interest income recognized	7,919	2,774
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	13,027	16,927
Recorded investment with an allowance	8,639	4,564
Unpaid principal balance	25,888	24,829
Related allowance	607	793
Average recorded investment	25,325	7,901
Interest income recognized	$ 343	$ 62

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 237,050	$ 327,349
Current	19,789,361	18,676,814
Total loans	20,026,411	19,004,163
Recorded Investment > 90 Days and Accruing	14,309	27,766
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	77,690	137,267
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26,767	33,000
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	132,593	157,082
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,638	13,561
Current	2,333,141	2,371,038
Total loans	2,341,779	2,384,599
Recorded Investment > 90 Days and Accruing	1,844	489
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,371	5,315
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	772	2,165
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,495	6,081
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,691	8,581
Current	1,537,644	1,364,840
Total loans	1,548,335	1,373,421
Recorded Investment > 90 Days and Accruing	644	477
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,397	4,113
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,129	1,056
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,165	3,412
Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112,209	191,167
Current	10,966,140	10,249,209
Total loans	11,078,349	10,440,376
Recorded Investment > 90 Days and Accruing	11,203	24,021
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,651	71,259
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,465	11,409
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	92,093	108,499
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	93,703	166,509
Current	8,526,898	8,131,428
Total loans	8,620,601	8,297,937
Recorded Investment > 90 Days and Accruing	10,823	21,989
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,257	62,766
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,895	10,761
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	77,551	92,982
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18,506	24,658
Current	2,439,242	2,117,781
Total loans	2,457,748	2,142,439
Recorded Investment > 90 Days and Accruing	380	2,032
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,394	8,493
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,570	648
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,542	15,517
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	70,750	74,712
Current	2,839,331	2,615,760
Total loans	2,910,081	2,690,472
Recorded Investment > 90 Days and Accruing		2,208
Residential Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	32,869	33,621
Residential Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,706	10,554
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23,175	30,537
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34,762	39,328
Current	2,113,105	2,075,967
Total loans	2,147,867	2,115,295
Recorded Investment > 90 Days and Accruing	618	571
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,402	22,959
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,695	7,816
Consumer [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 9,665	$ 8,553

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 14,968,463	$ 14,198,396
Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,902,485	12,601,853
Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	440,415	520,230
Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	105,227	126,137
Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	520,336	950,111
Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		65
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,910,081	2,690,472
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,147,867	2,115,295
Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,057,948	4,805,767
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,341,779	2,384,599
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,265,087	2,223,245
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	46,535	83,444
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,510	13,244
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,647	64,658
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		8
Construction and Land Development [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,548,335	1,373,421
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,487,599	1,291,638
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,099	60,804
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	816	4,788
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,821	16,191
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,078,349	10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,149,799	9,086,970
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	344,781	375,982
Total Commercial And Industrial [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	98,901	108,105
Total Commercial And Industrial [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	484,868	869,262
Total Commercial And Industrial [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		57
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,620,601	8,297,937
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,875,588	7,190,604
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	260,510	293,069
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	75,752	80,649
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	408,751	733,558
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		57
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,457,748	2,142,439
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,274,211	1,896,366
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	84,271	82,913
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,149	27,456
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	76,117	135,704
Performing [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,873,669	2,647,784
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,130,395	2,099,637
Performing [Member] | Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,004,064	4,747,421
Nonperforming [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	36,412	42,688
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,472	15,658
Nonperforming [Member] | Residential Mortgage and Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 53,884	$ 58,346

Loans and Allowance for Loan_11

Loans and Allowance for Loan Losses (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 147,537
Carrying Amount of Loans, Balance at beginning of period	153,403	$ 190,915
Carrying Amount of Loans, Additions		15,000
Carrying Amount of Loans, Payments received, net	(39,556)	(69,591)
Carrying Amount of Loans, Accretion	15,749	17,079
Carrying Amount of Loans, Balance at end of period	129,596	153,403
Accretable Yield, Balance at beginning of period	62,517	113,686
Accretable Yield, Payments received, net	(5,779)	(7,412)
Accretable Yield, Accretion	(15,749)	(17,079)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions	(3,695)	(30,379)
Accretable Yield, Net transfers from nonaccretable difference to accretable yield		3,701
Accretable Yield, Balance at end of period	$ 37,294	$ 62,517

Property and Equipment (Narrati

Property and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property and Equipment [Abstract]
Depreciation and amortization	$ 26,532	$ 28,142	$ 28,363
Property and equipment, held for sale	$ 27,200	$ 27,200

Property and Equipment (Propert

Property and Equipment (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 579,637	$ 548,661
Accumulated depreciation and amortization	(225,969)	(214,998)
Property and equipment, net	353,668	333,663
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70,960	71,061
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	311,409	305,277
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	92,805	92,360
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	72,721	70,003
Assets Under Development [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31,742	$ 9,960

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 790,972,000	$ 745,523,000	$ 621,193,000
Goodwill impairment charges	$ 0	0	$ 0
Estimated amortization expense succeeding period	5 years
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining life	8 years
Other Identifiable Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining life	15 years
FNBC Transactions [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 124,330,000

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Carrying Value of Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Purchase Value	$ 275,917	$ 248,355
Accumulated Amortization	179,766	157,715
Carrying Value	96,151	90,640
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Purchase Value	215,955	215,955
Accumulated Amortization	151,446	132,878
Carrying Value	64,509	83,077
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Purchase Value	49,962	22,400
Accumulated Amortization	19,564	16,882
Carrying Value	30,398	5,518
Merchant Processing Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Purchase Value	10,000	10,000
Accumulated Amortization	8,756	7,955
Carrying Value	$ 1,244	$ 2,045

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Aggregate Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	$ 22,050	$ 22,417	$ 19,781
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	18,566	19,442	16,411
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	2,682	1,975	2,172
Merchant Processing Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	$ 802	$ 1,000	$ 1,198

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Estimated Amortization Expense of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Other Intangible Assets [Abstract]
2,019	$ 19,859
2,020	15,924
2,021	12,953
2,022	10,599
2,023	8,401
Thereafter	28,415
Carrying Value	$ 96,151	$ 90,640

Time Deposits (Schedule of Deta

Time Deposits (Schedule of Detailed Time Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Time Deposits [Abstract]
Noninterest-bearing deposits	$ 8,499,027	$ 8,307,497
Interest-bearing retail transaction and savings deposits	8,000,092	8,181,555
Interest-bearing public fund deposits, Public fund transaction and savings deposits	2,622,938	2,763,182
Interest-bearing public fund deposits, Public fund time deposits	383,578	277,136
Total interest-bearing public fund deposits	3,006,516	3,040,318
Retail time deposits	2,416,086	1,906,768
Brokered time deposits	1,228,464	817,064
Total interest-bearing deposits	14,651,158	13,945,705
Total deposits	$ 23,150,185	$ 22,253,202

Time Deposits (Maturity of Time

Time Deposits (Maturity of Time Deposits) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Time Deposits [Abstract]
2,019	$ 3,235,947
2,020	504,374
2,021	209,149
2,022	62,399
2,023	13,848
Thereafter	2,411
Total time deposits	4,028,128
Certificates of deposits more than $250,000	$ 1,000

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loanitem	Dec. 31, 2017USD ($)
Short-term Debt [Line Items]
Short-term borrowings	$ 1,589,128	$ 1,703,890
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 1,160,104	$ 1,132,567
FHLB Borrowings [Member] | FHLB Borrowings, 6 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member]
Short-term Debt [Line Items]
Number of fixed rate short-term borrowings | item	3
Short-term borrowings	$ 250,000
Short-term maturity year	2,019
FHLB Borrowings [Member] | FHLB Borrowings, 6 Variable Rate Notes [Member] | Variable-rate Term Notes [Member]
Short-term Debt [Line Items]
Number of variable rate short-term borrowings | loan	6
Short-term borrowings	$ 910,000
FHLB Borrowings [Member] | FHLB Borrowings, 6 Variable Rate Notes [Member] | Debt Due 2020 [Member] | Variable-rate Term Notes [Member]
Short-term Debt [Line Items]
Short-term maturity year	2,020
FHLB Borrowings [Member] | FHLB Borrowings, 6 Variable Rate Notes [Member] | Debt Due 2026 [Member] | Variable-rate Term Notes [Member]
Short-term Debt [Line Items]
Short-term maturity year	2,026

Short-Term Borrowings (Short-Te

Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,589,128	$ 1,703,890
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	425	140,754
Average amount outstanding during period	39,968	27,063
Maximum amount at any month end during period	$ 100,925	$ 140,754
Weighted-average interest at period end	2.00%	1.00%
Weighted-average interest rate during period	2.11%	1.37%
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 428,599	$ 430,569
Average amount outstanding during period	456,000	501,719
Maximum amount at any month end during period	$ 500,345	$ 587,569
Weighted-average interest at period end	0.32%	0.17%
Weighted-average interest rate during period	0.23%	0.12%
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,160,104	$ 1,132,567
Average amount outstanding during period	1,694,804	1,478,114
Maximum amount at any month end during period	$ 2,410,258	$ 2,061,652
Weighted-average interest at period end	2.48%	1.35%
Weighted-average interest rate during period	2.02%	1.00%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	Dec. 18, 2015	Dec. 31, 2018	Dec. 31, 2017	Mar. 09, 2015
Debt Instrument [Line Items]
Notes payable aggregate principal amount		$ 229,598
Other long-term debt maturity year		2,053
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Notes payable issuance date		Mar. 9, 2015
Notes payable aggregate principal amount		$ 150,000	$ 150,000	$ 150,000
Notes payable maturity date		Jun. 15, 2045
Notes payable interest rate		5.95%
Notes payable beginning payment date		Jun. 1, 2015
Notes payable redemption date		Jun. 15, 2020
Term Note [Member] | Term Note Payable, Maturing December 2018 [Member]
Debt Instrument [Line Items]
Notes payable aggregate principal amount	$ 125,000		89,200
Notes payable maturity date		Dec. 18, 2018
Notes payable reference for variable rate		LIBOR+1.50%
Percentage points added to reference rate	1.50%
Principal payment of term loan		$ 4,500
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Notes payable aggregate principal amount		$ 79,598	$ 71,378
Notes payable agreement period		7 years

Long-Term Debt (Long-Term Debt)

Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 18, 2015	Mar. 09, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 229,598
Less unamortized debt issuance costs	(4,605)	$ (5,065)
Total long-term debt	224,993	305,513
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Gross long-term debt	150,000	150,000		$ 150,000
Less unamortized debt issuance costs	$ (4,605)
Notes payable maturity date	Jun. 15, 2045
Term Note [Member] | Term Note Payable, Maturing December 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt		89,200	$ 125,000
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 79,598	$ 71,378

Long-Term Debt (Long-Term Debt

Long-Term Debt (Long-Term Debt with Related Unamortized Debt Issuance Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Mar. 09, 2015
Debt Instrument [Line Items]
Principal	$ 229,598
Unamortized Debt Issuance Costs	4,605	$ 5,065
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Principal	150,000	150,000	$ 150,000
Unamortized Debt Issuance Costs	$ 4,605
Notes payable maturity date	Jun. 15, 2045
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Principal	$ 79,598	$ 71,378

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)item	Dec. 31, 2017USD ($)item
Derivative [Line Items]
Notional amount of derivatives	$ 3,024,565	$ 2,799,296
Gross Amounts Recognized, Derivative Liabilities	23,811	24,015
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	1,358,110	$ 1,358,110
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Number of interest rate swap terminated | item		2
Notional amount of derivatives	875,000	$ 875,000
Termination fees	10,600	1,100
Amortization of accumulated other comprehensive loss on terminated cash flow hedges	6,000	600
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 425,000
Derivative maturity expiration year	2,022
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 350,000
Derivative maturity expiration year	2,023
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2024 [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 100,000
Derivative maturity expiration year	2,024
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement One To Five [Member]
Derivative [Line Items]
Number of interest rate swap agreements | item	5
Number of interest rate swap terminated | item	5
Notional amount of derivatives	$ 450,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Notional amount of derivatives	483,110	$ 483,110
Visa Class B Derivative Contract [Member]
Derivative [Line Items]
Gross Amounts Recognized, Derivative Liabilities	$ 7,300

Derivatives (Fair Values of Der

Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		$ 3,024,565	$ 2,799,296
Fair Values, Assets		3,325	2,148
Fair Values, Liabilities		2,160	3,938
Less: netting adjustment, Assets	[1]	(11,979)	(4,913)
Less: netting adjustment, Liabilities	[1],[2]	(22,588)	(21,563)
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,358,110	1,358,110
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,666,455	1,441,186
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	[3]	1,277,404	1,144,789
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		171,222	119,951
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		77,208	80,462
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		59,119	53,724
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		37,749	42,260
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B Derivative Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		43,753
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		28,959	19,070
Total derivative assets/liabilities		16,980	14,157
Other Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		3,954
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		25,005	19,070
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[3]	23,670	15,408
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		10	23
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		110	1,000
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		464	186
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		751	2,453
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	44,815	35,952
Total derivative assets/liabilities	[2]	22,227	14,389
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	11,262	16,495
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	33,553	19,457
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2],[3]	24,669	15,857
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	131	109
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	664	290
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	67	782
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	718	2,419
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B Derivative Contract [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	7,304
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		875,000	875,000
Cash Flow Hedge [Member] | Other Assets [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets		3,954
Cash Flow Hedge [Member] | Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	9,173	14,020
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		483,110	483,110
Fair Value Hedging [Member] | Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[2]	$ 2,089	$ 2,475
[1]	Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.
[2]	Derivative assets and liabilities are reported in other assets or other liabilities, respectively, in the consolidated balance sheets.
[3]	The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions.Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.

Derivatives (Effects of Derivat

Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	$ (1,472)	$ 6,419	$ 7,506
Other NonInterest Income [Member] | All Other Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	5,368	5,870	5,196
Cash Flow Hedge [Member] | Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	(4,497)	(280)	$ 2,310
Fair Value Hedging [Member] | Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	$ (2,343)	$ 829

Derivatives (Offsetting Derivat

Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 16,167	$ 7,155
Gross Amounts Offset in the Statement of Income, Derivative Assets	(12,842)	(5,007)
Net Amounts Presented in the Statement of Income, Derivative Assets	3,325	2,148
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets	1,846	2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Assets
Net Amounts Presented in the Statement of Income, Derivative Assets	1,479
Gross Amounts Recognized, Derivative Liabilities	23,811	24,015
Gross Amounts Offset in the Statement of Income, Derivative Liabilities	(21,651)	(20,077)
Net Amounts Presented in the Statement of Income, Derivative Liabilities	2,160	3,938
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities	1,846	2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities	2,871	4,099
Net Amounts Presented in the Statement of Income, Derivative Liabilities	$ (2,557)	$ (2,309)

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 16, 2016	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 24, 2018
Equity, Class of Treasury Stock [Line Items]
Proceeds from issuance of common stock	$ 259,000				$ 259,299
Treasury stock shares		900,000	900,000	1,200,000
Treasury stock, Cost basis		$ 18,500	$ 18,500	$ 25,500
Tax computed at statutory rate			21.00%	35.00%	35.00%
Minimum risk-based capital ratio		8.00%	8.00%	8.00%
Minimum Tier 1 capital ratio		6.00%	6.00%	6.00%
Minimum Tier 1 leverage capital ratio		4.00%	4.00%	4.00%
Minimum Tier 1 common equity		4.50%	4.50%	4.50%
Well capitalized total risk based capital ratio		10.00%	10.00%	10.00%
Well capitalized Tier 1 risk-based capital ratio		8.00%	8.00%	8.00%
Well capitalized Tier 1 leverage capital ratio		5.00%	5.00%	5.00%
Well capitalized Tier 1 common equity		6.50%	6.50%	6.50%
Impact of re-measurement of deferred tax assets
Reclassification from AOCI to retained earnings			$ 25,300
Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares nonvested		1,300,000	1,300,000	1,500,000
2018 Stock Buyback Program [Member]
Equity, Class of Treasury Stock [Line Items]
Shares authorized for repurchase						5.00%
Number of shares authorized for repurchase						4,300,000
Shares repurchased		200,000
Shares repurchased price per share		$ 41.30
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Shares sold, price per share	$ 41
Shares sold	6,300,000
Impact of re-measurement of deferred tax assets
Bank Holding Companies and Banks that Meet Certain Criteria [Member]
Equity, Class of Treasury Stock [Line Items]
Minimum Tier 1 leverage capital ratio		3.00%	3.00%

Stockholders' Equity (Component

Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ (134,402)
Net change in unrealized gain (loss)		(52,757)	$ (425)	$ (57,346)
Reclassification of net (gain) loss realized and included in earnings		34,966	5,801	4,016
Valuation adjustment for pension plan amendment			17,315
Other valuation adjustments for employee benefit plans		(45,198)	(10,929)	(12,748)
Amortization of unrealized net loss on securities transferred to held to maturity		3,296	3,786	3,830
Income tax expense (benefit)		13,386	(4,088)	22,311
Impact of re-measurement of deferred tax assets
Ending Balance		(180,709)	(134,402)
Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(29,512)	(28,679)	4,268
Net change in unrealized gain (loss)		(52,060)	6,903	(49,839)
Reclassification of net (gain) loss realized and included in earnings		25,480		(1,912)
Other valuation adjustments for employee benefit plans
Other valuation adjustments for employee benefit plans
Amortization of unrealized net loss on securities transferred to held to maturity
Income tax expense (benefit)		(5,967)	1,067	(18,804)
Impact of re-measurement of deferred tax assets	[1]		6,669
Ending Balance		(50,125)	(29,512)	(28,679)
HTM Securities Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(14,585)	(14,392)	(16,795)
Net change in unrealized gain (loss)
Reclassification of net (gain) loss realized and included in earnings
Other valuation adjustments for employee benefit plans
Other valuation adjustments for employee benefit plans
Amortization of unrealized net loss on securities transferred to held to maturity		3,296	3,786	3,830
Income tax expense (benefit)		755	1,393	1,427
Impact of re-measurement of deferred tax assets	[1]		2,586
Ending Balance		(12,044)	(14,585)	(14,392)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(79,078)	(72,501)	(67,890)
Net change in unrealized gain (loss)
Reclassification of net (gain) loss realized and included in earnings		4,989	5,201	5,928
Other valuation adjustments for employee benefit plans			17,315	(12,748)
Other valuation adjustments for employee benefit plans		(45,198)	(10,929)
Amortization of unrealized net loss on securities transferred to held to maturity
Income tax expense (benefit)		(9,040)	4,228	(2,209)
Impact of re-measurement of deferred tax assets	[1]		13,936
Ending Balance		(110,247)	(79,078)	(72,501)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(11,227)	(4,960)	(178)
Net change in unrealized gain (loss)		(697)	(7,328)	(7,507)
Reclassification of net (gain) loss realized and included in earnings		4,497	600
Other valuation adjustments for employee benefit plans
Other valuation adjustments for employee benefit plans
Amortization of unrealized net loss on securities transferred to held to maturity
Income tax expense (benefit)		866	(2,600)	(2,725)
Impact of re-measurement of deferred tax assets	[1]		2,139
Ending Balance		(8,293)	(11,227)	(4,960)
Accumulated Other Comprehensive Loss, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(134,402)	(120,532)	(80,595)
Net change in unrealized gain (loss)		(52,757)	(425)	(57,346)
Reclassification of net (gain) loss realized and included in earnings		34,966	5,801	4,016
Other valuation adjustments for employee benefit plans			17,315	(12,748)
Other valuation adjustments for employee benefit plans		(45,198)	(10,929)
Amortization of unrealized net loss on securities transferred to held to maturity		3,296	3,786	3,830
Income tax expense (benefit)		(13,386)	4,088	(22,311)
Impact of re-measurement of deferred tax assets	[1]		25,330
Ending Balance		(180,709)	(134,402)	$ (120,532)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Valuation adjustment for pension plan amendment	[2]	$ (4,989)	$ (5,201)
[1]	Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.
[2]	Amounts in parenthesis indicate reduction in net income.

Stockholders' Equity (Line Item

Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items			$ 17,315
Amount Reclassified from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	$ (30,468)	(6,064)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain (loss) on sale of AFS securities	[1]	(25,480)
Tax effect	[1]	5,720
Net of tax	[1]	(19,760)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | HTM Securities Transferred from AFS [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized net loss on securities transferred to HTM	[1]	(3,296)	(3,786)
Tax effect	[1]	755	1,393
Net of tax	[1]	(2,541)	(2,393)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]	(4,989)	(5,201)
Tax effect	[1]	1,122	1,898
Net of tax	[1]	(3,867)	(3,303)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of unrealized gain on cash flow hedges	[1]	1,072
Tax effect	[1]	(244)
Net of tax	[1]	828
Amortization of loss on terminated cash flash hedges	[1]	(5,569)	(600)
Tax effect	[1]	1,269	232
Net of tax	[1]	$ (4,300)	$ (368)
[1]	Amounts in parenthesis indicate reduction in net income.

Stockholders' Equity (Complianc

Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Tier 1 leverage capital, Actual, Amount	$ 2,391,762	$ 2,214,723
Common equity tier 1 (to risk weighted assets), Actual, Amount	2,391,762	2,214,723
Tier 1 capital (to risk weighted assets), Actual, Amount	2,391,762	2,214,723
Total capital (to risk weighted assets), Actual, Amount	$ 2,736,276	$ 2,582,031
Tier 1 leverage capital, Actual, Ratio %	8.67%	8.43%
Common equity tier 1 (to risk weighted assets), Actual, Ratio %	10.48%	10.21%
Tier 1 capital (to risk weighted assets), Actual, Ratio %	10.48%	10.21%
Total capital (to risk weighted assets), Actual, Ratio %	11.99%	11.90%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount	$ 1,103,544	$ 1,051,025
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	1,026,637	976,303
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	1,368,849	1,301,738
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	$ 1,825,132	$ 1,735,650
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio %	4.00%	4.00%
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	4.50%	4.50%
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	6.00%	6.00%
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	8.00%	8.00%
Tier 1 leverage capital, Required To Be Well Capitalized, Amount	$ 1,379,430	$ 1,313,781
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount	1,482,920	1,410,216
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount	1,825,132	1,735,650
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount	$ 2,281,415	$ 2,169,563
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio %	5.00%	5.00%
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio %	6.50%	6.50%
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio %	8.00%	8.00%
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio %	10.00%	10.00%
Hancock Whitney Bank [Member]
Tier 1 leverage capital, Actual, Amount	$ 2,351,090	$ 2,282,485
Common equity tier 1 (to risk weighted assets), Actual, Amount	2,351,090	2,282,485
Tier 1 capital (to risk weighted assets), Actual, Amount	2,351,090	2,282,485
Total capital (to risk weighted assets), Actual, Amount	$ 2,545,604	$ 2,499,793
Tier 1 leverage capital, Actual, Ratio %	8.54%	8.72%
Common equity tier 1 (to risk weighted assets), Actual, Ratio %	10.32%	10.54%
Tier 1 capital (to risk weighted assets), Actual, Ratio %	10.32%	10.54%
Total capital (to risk weighted assets), Actual, Ratio %	11.17%	11.55%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount	$ 1,101,372	$ 1,046,644
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	1,025,355	974,362
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	1,367,140	1,299,150
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount	$ 1,822,053	$ 1,732,200
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio %	4.00%	4.00%
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	4.50%	4.50%
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	6.00%	6.00%
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio %	8.00%	8.00%
Tier 1 leverage capital, Required To Be Well Capitalized, Amount	$ 1,376,715	$ 1,308,305
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount	1,481,068	1,407,412
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount	1,822,853	1,732,200
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount	$ 2,278,566	$ 2,165,250
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio %	5.00%	5.00%
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio %	6.50%	6.50%
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio %	8.00%	8.00%
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio %	10.00%	10.00%

Noninterest Income and Nonint_3

Noninterest Income and Noninterest Expense (Components of Other Noninterest Income and Other Noninterest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other noninterest income:
Income from bank-owned life insurance	$ 12,424	$ 11,473	$ 13,596
Credit-related fees	11,065	11,140	9,926
Other miscellaneous income	20,297	19,684	16,146
Total other noninterest income	43,786	42,297	39,668
Other noninterest expense:
Advertising	12,334	15,031	10,938
Corporate value and franchise taxes	13,595	12,797	8,741
Entertainment and contributions	11,359	8,260	7,122
Telecommunications and postage	14,659	14,686	13,146
Other retirement expense	(18,661)	(15,249)	(10,496)
Other miscellaneous expense	47,407	46,548	45,313
Total other noninterest expense	$ 80,693	$ 82,073	$ 74,764

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Tax computed at statutory rate	21.00%	35.00%	35.00%
Tax year audited	2,015
Reclassification of certain tax effects from accumulated other comprehensive loss
Change in provisional tax benefit	$ 0
State [Member] | 2004 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Net operating loss carryforwards	$ 27,600,000
Operating loss carryforwards, originated tax years	2004 through 2017
Net operating loss carryforwards, expiration date	Dec. 31, 2024
Federal And State [Member] | From 2011 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Tax credit carryforwards	$ 2,100,000
Tax credit carryforwards, originated tax years	2011 through 2018 and
Minimum [Member] | Federal And State [Member] | From 2011 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Tax credit carryforwards, expiration date	Dec. 31, 2021

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current federal	$ 7,594	$ 38,859	$ 43,777
Current state	5,538	4,112	1,689
Total current provision	13,132	42,971	45,466
Deferred federal	41,078	48,653	(6,127)
Deferred state	4,136	1,178	(1,712)
Total deferred provision	45,214	49,831	(7,839)
Total included in net income	$ 58,346	$ 92,802	$ 37,627

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Allowance for loan losses	$ 45,198	$ 51,517
Employee compensation and benefits	12,796	9,783
Loan purchase accounting adjustments	1,132	6,441
Tax credit carryforward	2,059	21,274
Securities	17,390	12,250
State net operating loss	1,629	1,979
Other	18,431	13,763
Gross deferred tax assets	98,635	117,007
State valuation allowance	(1,629)	(1,979)
Net deferred tax assets	97,006	115,028
Fixed assets & intangibles	(44,277)	(42,597)
Lease financing	(23,605)	(12,285)
Other	(6,157)	(6,167)
Gross deferred tax liabilities	(74,039)	(61,049)
Net deferred tax asset	$ 22,967	$ 53,979

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Taxes computed at statutory rate, amount	$ 80,244	$ 107,952	$ 65,423
State income taxes, net of federal income tax benefit, amount	8,770	4,288	2,104
Tax-exempt interest, amount	(10,803)	(18,870)	(14,497)
Bank owned life insurance contracts, amount	(2,019)	(5,360)	(4,833)
Tax credits, amount	(11,344)	(9,286)	(10,410)
Employee share-based compensation, amount	(1,380)	(5,824)
FDIC assessment disallowance, amount	2,818
Return to provision adjustment, amount	(9,942)	(120)	(549)
Impact of deferred tax asset re-measurement		19,520
Other, net, amount	2,002	502	389
Total included in net income	$ 58,346	$ 92,802	$ 37,627
Taxes computed at statutory rate	21.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	2.30%	1.40%	1.10%
Tax-exempt interest	(2.80%)	(6.10%)	(7.80%)
Bank owned life insurance	(0.50%)	(1.70%)	(2.60%)
Tax credits	(3.00%)	(3.10%)	(5.60%)
Employee share-based compensation	(0.30%)	(1.90%)
FDIC assessment disallowance	0.70%
Return to provision adjustment	(2.60%)		(0.30%)
Impact of deferred tax asset re-measurement		6.30%
Other, net	0.50%	0.20%	0.30%
Income tax expense	15.30%	30.10%	20.10%

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Weighted-average anti-dilutive potential common shares	5,129	10,551	572,512

Earnings Per Share (Computation

Earnings Per Share (Computation of Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income to common shareholders	$ 323,770	$ 215,632	$ 149,296
Net income allocated to participating securities - basic and diluted	5,930	4,670	3,598
Net income allocated to common shareholders - basic and diluted	$ 317,840	$ 210,962	$ 145,698
Weighted-average common shares - basic	85,355	84,695	77,850
Dilutive potential common shares	166	268	99
Weighted-average common shares - diluted	85,521	84,963	77,949
Earnings per common share: Basic	$ 3.72	$ 2.49	$ 1.87
Earnings per common share: Diluted	$ 3.72	$ 2.48	$ 1.87

Retirement Benefit Plans (Narra

Retirement Benefit Plans (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended			24 Months Ended
	Mar. 31, 2019	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Newly eligible associates initial savings rate			3.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan						$ 0
Employer contributions			$ 40,138,000	$ 1,132,000
Funded status at end of year-net asset (liability)			50,601,000	50,521,000		50,601,000
Excess of plan assets over the benefit obligation			65,100,000			65,100,000
Unfunded benefit obligation			14,500,000			14,500,000
Estimated amounts of actuarial loss that will be amortized from AOCI into net periodic benefit cost over the next year			$ 8,900,000			$ 8,900,000
Hancock Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum age for increase in per capita cost of health care benefit			55 years
Years of credited service reaching 55 years of age			10 years
Increase (decrease) in pre- and post-medicare age health costs rate			7.50%			7.50%
Period of assumed health rate decline			4 years
Decrease in ultimate rate over a period of time			6.75%			6.75%
Whitney 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 14,600,000	$ 8,400,000	$ 7,700,000
Minimum age for increase in per capita cost of health care benefit			55 years
Years of credited service reaching 55 years of age			10 years
Amended Hancock Pension Plan And 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Reduction of benefit obligation		$ 17,300,000
Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of employment for eligibility			3 years
Additional matching percentage		2.00%
2017 Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan			$ 39,000,000
First 1% Of Contribution Saved [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage			100.00%
Percentage of compensation saved			1.00%
Next 5% Of Contribution Saved [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage			50.00%
Percentage of compensation saved			5.00%
2% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage		2.00%
4% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage		4.00%
6% Of Contribution [Member] | Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage		6.00%
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan	$ 100,000,000

Retirement Benefit Plans (Chang

Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation: at beginning of year	$ 513,844	$ 479,281
Service cost	12,414	15,381	$ 14,098
Interest cost	16,762	16,514	16,907
Plan amendments		(17,315)
Net actuarial gain (loss)	(30,796)	39,419
Benefit paid	(20,207)	(19,436)
Benefit obligation, end of year	492,017	513,844	479,281
Fair value of plan assets: at beginning of year	564,365	515,555
Actual return on plan assets	(40,491)	68,307
Employer contributions	40,138	1,132
Plan participants' contributions
Benefit payments	(20,207)	(19,436)
Expenses	(1,187)	(1,193)
Fair value of plan assets, end of year	542,618	564,365	515,555
Funded status at end of year-net asset (liability)				$ 50,601	$ 50,521
Unrecognized loss: at beginning of year	102,978	115,910
Net actuarial loss (gain)	46,492	(12,932)
Unrecognized (gain) loss at end of year	149,470	102,978	115,910
Projected benefit obligation	513,844	479,281	479,281	492,017	513,844
Accumulated benefit obligation				467,300	489,075
Fair value of plan assets	564,365	515,555	515,555	542,618	564,365
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation: at beginning of year	23,036	22,481
Service cost	120	129	170
Interest cost	621	668	773
Plan participants' contributions	628	636
Net actuarial gain (loss)	(6,717)	993
Benefit paid	(1,405)	(1,871)
Benefit obligation, end of year	16,283	23,036	22,481
Fair value of plan assets: at beginning of year
Actual return on plan assets
Employer contributions	777	1,235
Plan participants' contributions	628	636
Benefit payments	(1,405)	(1,871)
Expenses
Fair value of plan assets, end of year
Funded status at end of year-net asset (liability)				(16,283)	(23,036)
Unrecognized loss: at beginning of year	(732)	(2,078)
Net actuarial loss (gain)	(6,283)	1,346
Unrecognized (gain) loss at end of year	(7,015)	(732)	(2,078)
Projected benefit obligation	23,036	22,481	22,481	16,283	23,036
Fair value of plan assets

Retirement Benefit Plans (Compo

Retirement Benefit Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive income		$ 45,198	$ 10,929	$ 12,748
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		12,414	15,381	14,098
Interest cost		16,762	16,514	16,907
Expected return on plan assets		(41,033)	(37,632)	(34,554)
Amortization of net loss/ prior service cost		5,423	5,554	5,783
Net periodic benefit cost		(6,434)	(183)	2,234
Net (loss) gain recognized during the year		(5,423)	(5,554)	(5,783)
Net actuarial loss (gain)		51,915	(7,378)	12,128
Total recognized in other comprehensive income		46,492	(12,932)	6,345
Total recognized in net periodic benefit cost and other comprehensive income		$ 40,058	$ (13,115)	$ 8,579
Discount rate for benefit obligations		4.14%	3.57%	4.10%
Discount rate for net periodic benefit cost		3.57%	4.10%	4.40%
Expected long-term return on plan assets		7.25%	7.25%	7.25%
Rate of compensation increase	[1]
Pension Benefits [Member] | Graded Scale, At Age 20 [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		7.00%	7.00%	7.00%
Pension Benefits [Member] | Graded Scale, At Age 60 [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%	2.00%	2.00%
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 120	$ 129	$ 170
Interest cost		621	668	773
Amortization of net loss/ prior service cost		(434)	(353)	145
Net periodic benefit cost		307	444	1,088
Net (loss) gain recognized during the year		434	353	(145)
Net actuarial loss (gain)		(6,717)	993	620
Total recognized in other comprehensive income		(6,283)	1,346	475
Total recognized in net periodic benefit cost and other comprehensive income		$ (5,976)	$ 1,790	$ 1,563
Discount rate for benefit obligations		4.10%	3.52%	3.95%
Discount rate for net periodic benefit cost		3.52%	3.95%	4.32%
[1]	Graded scale, declining from 7.00% at age 20 to 2.00% at age 60

Retirement Benefit Plans (Expec

Retirement Benefit Plans (Expected Plan Benefit Payments) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
2,019	$ 22,921
2,020	24,046
2,021	25,175
2,022	26,198
2,023	27,114
2024-2028	153,505
Total	278,959
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	21,885
2,020	23,009
2,021	24,077
2,022	25,168
2,023	26,085
2024-2028	148,547
Total	268,771
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	1,036
2,020	1,037
2,021	1,098
2,022	1,030
2,023	1,029
2024-2028	4,958
Total	$ 10,188

Retirement Benefit Plans (Assum

Retirement Benefit Plans (Assumed Health Care Cost Trend Rates) (Details) - Other Post-Retirement Benefits [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Aggregated service and interest cost, 1% Decrease in Rates	$ 666
Postretirement benefit obligation, 1% Decrease in Rates	14,949
Aggregated service and interest cost, Assumed Rates	741
Postretirement benefit obligation, Assumed Rates	16,281
Aggregated service and interest cost, 1% Increase in Rates	834
Postretirement benefit obligation, 1% Increase in Rates	$ 17,894

Retirement Benefit Plans (Fair

Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 542,619	$ 564,365
Cash And Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,643	5,496
Total Cash and Cash-Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,643	5,496
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	116,881	113,331
Mutual Fund-Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,701	31,839
Total Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	148,582	145,170
Domestic And Foreign Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80,819	102,422
Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150,466	168,299
Total Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	231,285	270,721
Total Real Assets At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	388,510	421,387
Common Trust Fund (Fixed Income) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125,706	114,068
Common Trust Fund (Real Assets) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,402	28,910
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	291,334	308,050
Level 1 [Member] | Cash And Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,643	5,496
Level 1 [Member] | Total Cash and Cash-Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,643	5,496
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,856
Level 1 [Member] | Mutual Fund-Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,556	31,839
Level 1 [Member] | Total Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	51,412	31,839
Level 1 [Member] | Domestic And Foreign Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80,813	102,416
Level 1 [Member] | Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150,466	168,299
Level 1 [Member] | Total Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	231,279	270,715
Level 1 [Member] | Total Real Assets At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	291,334	308,050
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97,031	113,175
Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97,025	113,169
Level 2 [Member] | Total Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97,025	113,169
Level 2 [Member] | Domestic And Foreign Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	6
Level 2 [Member] | Total Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	6
Level 2 [Member] | Total Real Assets At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97,031	113,175
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	145
Level 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		162
Level 3 [Member] | Mutual Fund-Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	145
Level 3 [Member] | Total Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	145	162
Level 3 [Member] | Total Real Assets At Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 145	$ 162

Retirement Benefit Plans (Perce

Retirement Benefit Plans (Percentage and Target Allocations) (Details)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Cash And Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	1.00%
Cash And Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Cash And Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%	5.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	51.00%	46.00%
Fixed Income Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%	35.00%
Fixed Income Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	63.00%	63.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	43.00%	48.00%
Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%	35.00%
Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	51.00%	51.00%
Real Assets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	5.00%	5.00%
Real Assets Fund [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Real Assets Fund [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	12.00%	12.00%

Share-Based Payment Arrangeme_3

Share-Based Payment Arrangements (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)entity$ / sharesshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation recognized | $	$ 19,800	$ 17,600	$ 14,300
Recognized tax benefit related to share-based compensation | $	$ 5,800	$ 13,300	5,200
Percentage where an option price is equal to market price	110.00%
Service period	5 years
Term of option award vest, contractual term	10 years
2014 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate awards authorized for grant		1,200,000
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised | $	$ 600	$ 4,300	$ 500
Options [Member] | 2014 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate awards authorized for grant		2,996,357
Maximum number of shares which may be granted to participant		100,000
Shares available for future issuance	1,100,000
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 54,300
Weighted-average period	3 years 6 months
Total fair value of shares vested | $	$ 26,200	$ 26,300
Shares granted	647,376
Grant date fair value per share | $ / shares	$ 39.70
Executive Management [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	3 years
Executive Management [Member] | Performance Shares [Member] | Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	26,147
Grant date fair value per share | $ / shares	$ 51.13
Vesting performance period	3 years
Number of peer group regional banks | entity	43
Executive Management [Member] | Performance Shares [Member] | Core Earnings Per Share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	26,147
Grant date fair value per share | $ / shares	$ 44.84
Vesting performance period	2 years
Executive Management [Member] | Tranche One [Member] | Performance Shares [Member] | Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of maximum number of shares vested	200.00%

Share-Based Payment Arrangeme_4

Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning	88,301
Number of Shares, Exercised	(35,317)
Number of Shares, Expired	(6,119)
Number of Shares, Outstanding at Ending	46,865	88,301
Number of Shares, Exercisable at Ending	46,685
Weighted Average Exercise Price, Outstanding at Beginning	$ 34.84
Weighted Average Exercise Price, Exercised	37.39
Weighted Average Exercise Price, Expired	42.82
Weighted Average Exercise Price, Outstanding at Ending	31.88	$ 34.84
Weighted Average Exercise Price, Exercisable at Ending	$ 31.88
Weighted Average Remaining Contractual Term (Years)	2 years 7 months 6 days	2 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at Beginning	$ 1,294
Aggregate Intrinsic Value, Exercised	592
Aggregate Intrinsic Value, Expired	10
Aggregate Intrinsic Value, Outstanding at Ending	164	$ 1,294
Aggregate Intrinsic Value, Exercisable at Ending	$ 164

Share-Based Payment Arrangeme_5

Share-Based Payment Arrangements (Summary of Nonvested Restricted and Performance Shares) (Details) - Restricted and Performance Shares [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Nonvested at Beginning | shares	1,708,942
Number of Shares, Granted | shares	647,376
Number of Shares, Vested | shares	(792,084)
Number of Shares, Cancelled/Forfeited | shares	(70,193)
Number of Shares, Nonvested at Ending | shares	1,494,041
Weighted Average Grant Date Fair Value, Nonvested at Beginning | $ / shares	$ 37.05
Weighted Average Grant Date Fair Value, Granted | $ / shares	39.70
Weighted Average Grant Date Fair Value, Vested | $ / shares	33.94
Weighted Average Grant Date Fair Value, Cancelled/Forfeited | $ / shares	36.13
Weighted Average Grant Date Fair Value, Nonvested at Ending | $ / shares	$ 39.89

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies [Abstract]
Rental expense	$ 18.2	$ 17	$ 11.7

Commitments and Contingencies_3

Commitments and Contingencies (Off-Balance Sheet Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Contract amounts	$ 7,234,528	$ 6,689,033
Letters of Credit [Member]
Loss Contingencies [Line Items]
Contract amounts	$ 365,498	$ 348,377

Commitments and Contingencies_4

Commitments and Contingencies (Future Minimum Lease Payments for Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Commitments and Contingencies [Abstract]
2,019	$ 18,476
2,020	17,059
2,021	15,780
2,022	15,506
2,023	14,373
Thereafter	101,402
Total minimum lease payments	$ 182,596

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Narrative) (Details) - Recurring [Member]	12 Months Ended
	Dec. 31, 2018USD ($)shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfers of assets and liabilities between level 1 and 2 | $	$ 0
Visa Inc [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Number of shares of Visa Class B common stock | shares	192,163
Investment Securities [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Targeted duration	2 years
Investment Securities [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Targeted duration	5 years

Fair Value of Financial Instr_4

Fair Value of Financial Instruments (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		$ 2,691,037	$ 2,910,869
Derivative assets		3,325	2,148
Derivative liabilities		2,160	3,938
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,691,037	2,910,869
Derivative assets		16,980	14,157
Derivative liabilities		14,923	14,389
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		7,304
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,691,037	2,910,869
Derivative assets	[1]	16,980	14,157
Total recurring fair value measurements - assets		2,708,017	2,925,026
Derivative liabilities	[1]	22,227	14,389
Total recurring fair value measurements - liabilities		22,227	14,389
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,691,037	2,910,869
Derivative assets	[1]	16,980	14,157
Total recurring fair value measurements - assets		2,708,017	2,925,026
Derivative liabilities	[1]	14,923	14,389
Total recurring fair value measurements - liabilities		14,923	14,389
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	[1]	7,304
Total recurring fair value measurements - liabilities		7,304
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		71,706	97,272
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		71,706	97,272
Recurring [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		240,427	243,786
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		240,427	243,786
Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		3,500	3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		3,500	3,500
Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		1,443,402	1,715,213
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		1,443,402	1,715,213
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		770,077	687,135
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		770,077	687,135
Recurring [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		161,925	163,963
Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		$ 161,925	$ 163,963
[1]	For further disaggregation of derivative assets and liabilities, see Note 10 - Derivatives.

Fair Value of Financial Instr_5

Fair Value of Financial Instruments (Schedule of Level 3 Fair Value Rollforward) (Details) - Level 3 [Member] - Recurring [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Entry into derivative contract	$ 7,304
Ending balance	$ 7,304

Fair Value of Financial Instr_6

Fair Value of Financial Instruments (Overview of the Valuation Techniques and Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		$ 2,160	$ 3,938
Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		7,304
Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	22,227	$ 14,389
Recurring [Member] | Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	7,304
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		$ 7,304
Recurring [Member] | Minimum [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		24 months
Recurring [Member] | Minimum [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		6.00%
Recurring [Member] | Minimum [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.62%
Recurring [Member] | Maximum [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		48 months
Recurring [Member] | Maximum [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		18.00%
Recurring [Member] | Maximum [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.59%
[1]	For further disaggregation of derivative assets and liabilities, see Note 10 - Derivatives.

Fair Value of Financial Instr_7

Fair Value of Financial Instruments (Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 170,918	$ 184,205
Other real estate owned and foreclosed assets, net	14,594	19,608
Total nonrecurring fair value measurements	185,512	203,813
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	170,918	184,205
Total nonrecurring fair value measurements	170,918	184,205
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and foreclosed assets, net	14,594	19,608
Total nonrecurring fair value measurements	$ 14,594	$ 19,608

Fair Value of Financial Instr_8

Fair Value of Financial Instruments (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 2,691,037	$ 2,910,869
Held to maturity securities	2,979,547	2,977,511
Derivative financial instruments	3,325	2,148
Derivative financial instruments	2,160	3,938
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	494,466	479,332
Federal funds purchased	425	140,754
Securities sold under agreements to repurchase	428,599	430,569
FHLB Borrowings	1,160,104	1,132,567
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	2,691,037	2,910,869
Held to maturity securities	2,935,856	2,962,010
Loans, net	170,918	184,205
Loans held for sale	28,150	39,865
Derivative financial instruments	16,980	14,157
Long-term debt	223,135	303,631
Derivative financial instruments	14,923	14,389
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	19,555,969	18,403,303
Deposits	23,129,574	22,238,847
Derivative financial instruments	7,304
Total Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	494,466	479,332
Available for sale debt securities	2,691,037	2,910,869
Held to maturity securities	2,935,856	2,962,010
Loans, net	19,726,887	18,587,508
Loans held for sale	28,150	39,865
Derivative financial instruments	16,980	14,157
Deposits	23,129,574	22,238,847
Federal funds purchased	425	140,754
Securities sold under agreements to repurchase	428,599	430,569
FHLB Borrowings	1,160,104	1,132,567
Long-term debt	223,135	303,631
Derivative financial instruments	22,227	14,389
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	494,466	479,332
Available for sale debt securities	2,691,037	2,910,869
Held to maturity securities	2,979,547	2,977,511
Loans, net	19,831,897	18,786,855
Loans held for sale	28,150	39,865
Derivative financial instruments	16,980	14,157
Deposits	23,150,185	22,253,202
Federal funds purchased	425	140,754
Securities sold under agreements to repurchase	428,599	430,569
FHLB Borrowings	1,160,104	1,132,567
Long-term debt	224,993	305,513
Derivative financial instruments	$ 22,227	$ 14,389

Condensed Parent Company Info_3

Condensed Parent Company Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale	$ 2,691,037	$ 2,910,869
Total assets	28,235,907	27,336,086
Long-term debt	224,993	305,513
Other liabilities	177,994	179,852
Stockholders' equity	3,081,340	2,884,949	$ 2,719,768	$ 2,413,143
Total liabilities and stockholders' equity	28,235,907	27,336,086
Hancock Whitney Corporation [Member]
Cash	153,939	71,328
Securities available for sale		58,521
Investment in bank subsidiaries	3,040,186	2,953,032
Investment in non-bank subsidiaries	26,274	22,670
Due from subsidiaries and other assets	6,868	14,010
Total assets	3,227,267	3,119,561
Long-term debt	145,396	234,135
Other liabilities	531	477
Stockholders' equity	3,081,340	2,884,949
Total liabilities and stockholders' equity	$ 3,227,267	$ 3,119,561

Condensed Parent Company Info_4

Condensed Parent Company Information (Condensed Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax benefit	$ 58,346	$ 92,802	$ 37,627
Net income	323,770	215,632	149,296
Other comprehensive income (loss) net of income taxes	(46,307)	11,460	(39,937)
Comprehensive income	277,463	227,092	109,359
Hancock Whitney Corporation [Member]
Cash dividends received from bank subsidiaries	200,000	90,000	120,000
Noncash dividend from bank subsidiaries		11,708
Equity in earnings of subsidiaries greater than dividends received	137,914	124,531	39,293
Total operating income	337,914	226,239	159,293
Other expense, net	(18,728)	(16,931)	(16,614)
Income tax benefit	(4,584)	(6,324)	(6,617)
Net income	323,770	215,632	149,296
Other comprehensive income (loss) net of income taxes	(46,307)	11,460	(39,937)
Comprehensive income	$ 277,463	$ 227,092	$ 109,359

Condensed Parent Company Info_5

Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	Dec. 16, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net cash provided by operating activities		$ 449,184	$ 411,085	$ 343,915
Proceeds from sales of securities available for sale		455,162	213,877	173,215
Other, net		491	(6,824)	825
Net cash used in investing activities		(846,902)	(895,321)	(1,321,031)
Proceeds from issuance of long term debt		20,610	165	6,838
Repayments of long term debt		(90,216)	(204,111)	(21,271)
Dividends paid to stockholders		(88,838)	(83,266)	(76,551)
Repurchase of common stock		(8,267)
Proceeds from issuance of common stock	$ 259,000			259,299
Payroll tax remitted on net share settlement of equity awards		(8,695)	(11,881)	(3,178)
Net cash provided by financing activities		394,142	498,495	1,045,931
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS		(3,576)	14,259	68,815
CASH AND DUE FROM BANKS, BEGINNING		386,948	372,689	303,874
CASH AND DUE FROM BANKS, ENDING		383,372	386,948	372,689
Hancock Whitney Corporation [Member]
Cash flows from operating activities - principally dividends received from subsidiaries		216,270	111,591	122,528
Net cash provided by operating activities		216,270	111,591	122,528
Contribution of capital to subsidiary			(270,000)	(21,000)
Proceeds from sales of securities available for sale		47,557
Proceeds from principal paydowns of securities available for sale		9,091	11,015	13,827
Net cash used in investing activities		56,648	(258,985)	(7,173)
Repayments of long term debt		(89,200)	(17,900)	(17,900)
Dividends paid to stockholders		(88,838)	(83,266)	(77,012)
Repurchase of common stock		(8,267)
Proceeds from issuance of common stock		4,693	15,312	262,961
Payroll tax remitted on net share settlement of equity awards		(8,695)	(11,881)	(3,178)
Other, net				(133)
Net cash provided by financing activities		(190,307)	(97,735)	164,738
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS		82,611	(245,129)	280,093
CASH AND DUE FROM BANKS, BEGINNING		71,328	316,457	36,364
CASH AND DUE FROM BANKS, ENDING		$ 153,939	$ 71,328	$ 316,457

Subsequent Event (Details)

Subsequent Event (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Subsequent Event [Abstract]
Potential loss resulting from customer bankruptcy	$ 11