Hancock Whitney Corporation - 6 (HWC) 10-Q 8 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	HANCOCK WHITNEY CORP
Entity Filer Category	Large Accelerated Filer
Entity Central Index Key	0000750577
Trading Symbol	HWC
Amendment Flag	false
Document Type	10-Q
Document Fiscal Period Focus	Q1
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		85,720,238

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 360,194	$ 383,372
Interest-bearing bank deposits	163,232	110,579
Federal funds sold	530	515
Securities available for sale, at fair value (amortized cost of $2,698,865 and $2,755,806)	2,681,080	2,691,037
Securities held to maturity (fair value of $2,892,910 and $2,935,856)	2,896,442	2,979,547
Loans held for sale	27,437	28,150
Loans	20,112,838	20,026,411
Less: allowance for loan losses	(194,688)	(194,514)
Loans, net	19,918,150	19,831,897
Property and equipment, net of accumulated depreciation of $233,078 and $225,969	358,205	353,668
Right of use assets, net of accumulated amortization of $3,064	113,447
Prepaid expenses	39,153	35,047
Other real estate and foreclosed assets, net	27,148	26,270
Accrued interest receivable	94,404	86,681
Goodwill	792,084	790,972
Other intangible assets, net	91,013	96,151
Life insurance contracts	553,893	549,300
Deferred tax asset, net		22,967
Funded pension assets, net	168,910	65,125
Other assets	204,909	184,629
Total assets	28,490,231	28,235,907
Deposits
Noninterest-bearing	8,158,658	8,499,027
Interest-bearing	15,221,636	14,651,158
Total deposits	23,380,294	23,150,185
Short-term borrowings	1,388,735	1,589,128
Long-term debt	224,962	224,993
Accrued interest payable	18,031	12,267
Lease liabilities	128,494
Deferred tax liability, net	19,065
Other liabilities	140,075	177,994
Total liabilities	25,299,656	25,154,567
Stockholders' equity:
Common stock	292,716	292,716
Capital surplus	1,731,148	1,725,741
Retained earnings	1,299,220	1,243,592
Accumulated other comprehensive loss, net	(132,509)	(180,709)
Total stockholders' equity	3,190,575	3,081,340
Total liabilities and stockholders' equity	$ 28,490,231	$ 28,235,907
Preferred shares authorized (par value of $20.00 per share)	50,000,000	50,000,000
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	85,710,000	85,643,000

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 2,698,865	$ 2,755,806
Securities held to maturity, fair value	2,892,910	2,935,856
Property and equipment, accumulated depreciation	233,078	$ 225,969
Right of use assets, accumulated amortization	$ 3,064
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 (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income:
Loans, including fees	$ 238,282	$ 205,847
Loans held for sale	253	221
Securities-taxable	31,139	29,301
Securities-tax exempt	5,446	5,537
Short-term investments	1,163	489
Total interest income	276,283	241,395
Interest expense:
Deposits	46,138	26,959
Short-term borrowings	8,082	5,351
Long-term debt	2,809	3,421
Total interest expense	57,029	35,731
Net interest income	219,254	205,664
Provision for loan losses	18,043	12,253
Net interest income after provision for loan losses	201,211	193,411
Noninterest income:
Service charges on deposit accounts	20,367	21,448
Trust fees	15,124	11,335
Bank card and ATM fees	15,290	14,458
Investment and annuity fees and insurance commissions	6,528	6,125
Secondary mortgage market operations	3,726	3,401
Other income	9,468	9,485
Total noninterest income	70,503	66,252
Noninterest expense:
Compensation expense	83,968	80,100
Employee benefits	19,730	19,874
Personnel expense	103,698	99,974
Net occupancy expense	11,984	11,010
Equipment expense	4,679	3,546
Data processing expense	19,331	16,449
Professional services expense	8,168	9,255
Amortization of intangible assets	5,138	5,618
Deposit insurance and regulatory fees	5,406	7,948
Other real estate (income) expense	(991)	210
Other expense	18,287	16,781
Total noninterest expense	175,700	170,791
Income before income taxes	96,014	88,872
Income taxes	16,850	16,397
Net income	$ 79,164	$ 72,475
Earnings per common share-basic	$ 0.91	$ 0.83
Earnings per common share-diluted	0.91	0.83
Dividends paid per share	$ 0.27	$ 0.24
Weighted average shares outstanding-basic	85,688	85,241
Weighted average shares outstanding-diluted	85,800	85,423

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 79,164	$ 72,475
Other comprehensive income/loss before income taxes:
Net change in unrealized gain/loss on securities available for sale and cash flow hedges	57,243	(62,244)
Reclassification of net losses realized and included in earnings	4,219	1,796
Amortization of unrealized net loss on securities transferred to held to maturity	591	755
Other comprehensive income/loss before income taxes	62,053	(59,693)
Income tax expense (benefit)	13,853	(13,546)
Other comprehensive income/loss net of income taxes	48,200	(46,147)
Comprehensive income	$ 127,364	$ 26,328

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]
Balance at Dec. 31, 2017	$ 2,884,949	$ 292,716	$ 1,718,117	$ 1,008,518	$ (134,402)
Balance, Shares Issued at Dec. 31, 2017		87,903
Net income	72,475			72,475
Other comprehensive income (loss)	(46,147)				(46,147)
Comprehensive income	26,328			72,475	(46,147)
Cash dividends declared	(20,881)			(20,881)
Common stock activity, long-term incentive plan	4,805		4,735	70
Issuance of stock from dividend reinvestment and stock purchase plans	837		837
Balance, Shares Issued at Mar. 31, 2018		87,903
Balance at Mar. 31, 2018	2,896,038	$ 292,716	1,723,689	1,060,182	(180,549)
Balance at Dec. 31, 2018	$ 3,081,340	$ 292,716	1,725,741	1,243,592	(180,709)
Balance, Shares Issued at Dec. 31, 2018	87,903	87,903
Net income	$ 79,164			79,164
Other comprehensive income (loss)	48,200				48,200
Comprehensive income	127,364			79,164	48,200
Cash dividends declared	(23,581)			(23,581)
Common stock activity, long-term incentive plan	4,573		4,528	45
Issuance of stock from dividend reinvestment and stock purchase plans	$ 879		879
Balance, Shares Issued at Mar. 31, 2019	87,903	87,903
Balance at Mar. 31, 2019	$ 3,190,575	$ 292,716	$ 1,731,148	$ 1,299,220	$ (132,509)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retained Earnings [Member]
Cash dividends declared, per common share	$ 0.27	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 79,164	$ 72,475
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,516	6,551
Provision for loan losses	18,043	12,253
(Gain) loss on other real estate owned	(991)	210
Deferred tax expense	30,829	14,790
Increase in cash surrender value of life insurance contracts	(3,772)	(3,346)
Loss on sale of business		1,145
Net decrease in loans held for sale	5,714	18,172
Net amortization of securities premium/discount	7,009	8,453
Amortization of intangible assets	5,138	5,618
Stock-based compensation expense	5,181	4,883
Contribution to pension plan	(100,000)
Decrease in interest payable and other liabilities	(15,478)	(32,568)
Decrease in payable to FDIC for loan servicing		(11,107)
(Increase) decrease in other assets	(23,335)	6,821
Other, net	(1,595)	144
Net cash provided by operating activities	13,423	104,494
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of securities available for sale	55,596	80,155
Purchases of securities available for sale	(1,502)	(142,052)
Proceeds from maturities of securities held to maturity	79,533	93,408
Purchases of securities held to maturity		(134,020)
Net (increase) decrease in short-term investments	(52,668)	30,843
Proceeds from sales of loans and leases	42,059	12,211
Net increase in loans	(148,073)	(196,328)
Purchases of property and equipment	(12,435)	(7,904)
Proceeds from sales of property and equipment	115	42
Proceeds from sales of other real estate	4,613	1,641
Final cash settlement for acquisition of business	(1,112)
Proceeds from the sale of business, net of cash sold		77,081
Other, net	(8,978)	(8,915)
Net cash used in investing activities	(42,852)	(193,838)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	230,109	232,638
Net decrease in short-term borrowings	(200,393)	(251,793)
Repayments of long-term debt	(75)	(5,268)
Net proceeds from issuance of long-term debt		83
Dividends paid	(23,581)	(20,881)
Payroll tax remitted on net share settlement of equity awards	(688)	(142)
Proceeds from exercise of stock options		782
Proceeds from dividend reinvestment and stock purchase plans	879	837
Net cash provided by (used in) financing activities	6,251	(43,744)
NET DECREASE IN CASH AND DUE FROM BANKS	(23,178)	(133,088)
CASH AND DUE FROM BANKS, BEGINNING	383,372	386,948
CASH AND DUE FROM BANKS, ENDING	360,194	253,860
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 4,273	$ 1,305

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. The consolidated financial statements include the accounts of Hancock Whitney Corporation and all other entities in which it has a controlling interest (the “Company”). The financial statements include all adjustments that are, in the opinion of management, necessary to fairly state the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. The Company has also evaluated all subsequent events for potential recognition and disclosure through the date of the filing of this Quarterly Report on Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) have been condensed or omitted in this Quarterly Report on Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Financial information reported in these financial statements is not necessarily indicative of the Company’s financial condition, results of operations, or cash flows for any other interim or annual period. Certain prior period amounts have been reclassified to conform to the current period presentation. These changes in presentation did not have a material impact on the Company’s financial condition or operating results. Use of Estimates The accounting principles the Company follows and the methods for applying these principles conform to GAAP and general practices followed by the banking industry. These accounting principles 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. Critical Accounting Policies and Estimates There were no material changes or developments during the reporting period with respect to methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in its Annual Report on Form 10-K for the year ended December 31, 2018. Refer to Note 16 – Recent Accounting Pronouncements for a discussion of accounting standards adopted during the three months ended March 31, 2019.

Acquisition

Acquisition	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisition	2. Acquisition 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 following table sets forth the acquisition date fair value of the assets acquired and the liabilities assumed, the consideration received, and the resulting goodwill. (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 140,657 Goodwill $ 46,561 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 deductible for federal income tax purposes. The following table presents the change in the Company’s goodwill during the year ended December 31, 2018 and the three months ended March 31, 2019. (in thousands) Goodwill balance at December 31, 2017 $ 745,523 Intital goodwill recorded - 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 Final settlement of cash consideration - acquisition of trust and asset management business 1,112 Goodwill balance at March 31, 2019 $ 792,084 The acquired trust and asset management business added $4.9 million in trust fee revenue and $4.8 million of expense to the Company’s results of operations for the three months ended March 31, 2019. The results are not material to the Company’s results of operations and, as such, supplemental proforma financial information for the three months ended March 31, 2018 is not presented. During the three months ended March 31, 2018, the Company incurred acquisition related costs of approximately $0.3 million.

Securities

Securities	3 Months Ended
	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Securities	3. Securities The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available for sale and held to maturity at March 31, 2019 and December 31, 2018 follow. Securities Available for Sale (in thousands) March 31, 2019 December 31, 2018 Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value U.S. Treasury and government agency securities $ 73,426 — 1,283 $ 72,143 $ 74,339 $ — $ 2,633 $ 71,706 Municipal obligations 245,707 1,833 1,600 245,940 246,713 360 6,646 240,427 Residential mortgage-backed securities 1,418,881 9,964 15,813 1,413,032 1,468,912 4,284 29,794 1,443,402 Commercial mortgage-backed securities 798,447 4,594 15,207 787,834 799,060 1,953 30,936 770,077 Collateralized mortgage obligations 158,904 1,212 1,485 158,631 163,282 903 2,260 161,925 Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,698,865 $ 17,603 $ 35,388 $ 2,681,080 $ 2,755,806 $ 7,500 $ 72,269 $ 2,691,037 March 31, 2019 December 31, 2018 Gross Gross Gross Securities Held to Maturity 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 — 317 $ 49,683 $ 50,000 $ — $ 478 $ 49,522 Municipal obligations 676,651 11,247 1,726 686,172 688,201 2,347 9,503 681,045 Residential mortgage-backed securities 613,964 3,701 3,148 614,517 640,393 1,461 6,117 635,737 Commercial mortgage-backed securities 356,919 1,233 3,780 354,372 357,175 376 10,882 346,669 Collateralized mortgage obligations 1,198,908 3,285 14,027 1,188,166 1,243,778 1,598 22,493 1,222,883  $ 2,896,442 $ 19,466 $ 22,998 $ 2,892,910 $ 2,979,547 $ 5,782 $ 49,473 $ 2,935,856 The following tables present the amortized cost and estimated fair value of debt securities available for sale and held to maturity at March 31, 2019 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 collateralized mortgage obligations. Debt Securities Available for Sale Amortized Fair (in thousands) Cost Value Due in one year or less $ 368 $ 374 Due after one year through five years 107,225 108,866 Due after five years through ten years 1,184,905 1,175,070 Due after ten years 1,406,367 1,396,770 Total available for sale debt securities $ 2,698,865 $ 2,681,080 Debt Securities Held to Maturity Amortized Fair (in thousands) Cost Value Due in one year or less $ 80,915 $ 80,716 Due after one year through five years 67,617 67,418 Due after five years through ten years 1,392,654 1,398,880 Due after ten years 1,355,256 1,345,896 Total held to maturity securities $ 2,896,442 $ 2,892,910 The Company held no securities classified as trading at March 31, 2019 and December 31, 2018. The fair value and gross unrealized losses for securities classified as available for sale with unrealized losses for the periods indicated follow. Available for Sale March 31, 2019 Losses < 12 months Losses 12 months or > Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Treasury and government agency securities $ - - 72,143 1,283 $ 72,143 $ 1,283 Municipal obligations 2,270 40 106,042 1,560 108,312 1,600 Residential mortgage-backed securities 640 6 852,716 15,807 853,356 15,813 Commercial mortgage-backed securities - - 583,978 15,207 583,978 15,207 Collateralized mortgage obligations - - 108,798 1,485 108,798 1,485  $ 2,910 $ 46 $ 1,723,677 $ 35,342 $ 1,726,587 $ 35,388 Available for Sale December 31, 2018 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 fair value and gross unrealized losses for securities classified as held to maturity with unrealized losses for the periods indicated follow. Held to Maturity March 31, 2019 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 $ — — $ 49,682 $ 317 $ 49,682 $ 317 Municipal obligations 8,750 63 169,931 1,663 178,681 1,726 Residential mortgage-backed securities — — 186,221 3,148 186,221 3,148 Commercial mortgage-backed securities — — 312,296 3,780 312,296 3,780 Collateralized mortgage obligations — — 860,183 14,027 860,183 14,027  $ 8,750 $ 63 $ 1,578,313 $ 22,935 $ 1,587,063 $ 22,998 Held to Maturity December 31, 2018 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 unrealized losses relate primarily to changes in market rates on fixed rate debt securities since the respective purchase dates. 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 had adequate liquidity as of March 31, 2019 and December 31, 2018 and did not intend to nor believe that it would be required to sell these securities before recovery of the indicated impairment. Accordingly, the unrealized losses on these securities were determined to be temporary. Should the Company’s intent to sell these securities change, the difference between the amortized cost and the fair value will be recognized into earnings at that time. There were no sales of securities during the three months ended March 31, 2019 and 2018. Securities with carrying values totaling $3.7 billion and $3.4 billion at March 31, 2019 and December 31, 2018, respectively, were pledged as collateral, primarily to secure public deposits or securities sold under agreements to repurchase.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans and Allowance for Loan Losses	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, by portfolio are presented in the table below. March 31, December 31, (in thousands) 2019 2018 Commercial non-real estate $ 8,656,326 $ 8,620,601 Commercial real estate - owner occupied 2,515,428 2,457,748 Total commercial and industrial 11,171,754 11,078,349 Commercial real estate - income producing 2,563,394 2,341,779 Construction and land development 1,340,067 1,548,335 Residential mortgages 2,933,251 2,910,081 Consumer 2,104,372 2,147,867 Total loans $ 20,112,838 $ 20,026,411 The following briefly describes the composition of each loan category. Commercial and industrial Commercial and industrial loans are made available to businesses for working capital (including financing of inventory and receivables), business expansion, to facilitate the acquisition of a business, and the purchase of equipment and machinery, including equipment leasing. These loans are primarily made based on the identified cash flows of the borrower and, when secured, have the added strength of the underlying collateral. Commercial non-real estate loans may be secured by the assets being financed or other tangible or intangible business assets such as accounts receivable, inventory, ownership, enterprise value or commodity interests, and may incorporate a personal or corporate guarantee; however, some short-term loans may be made on an unsecured basis, including a small portfolio of corporate credit cards, generally issued as a part of overall customer relationships. Commercial real estate – owner occupied loans consist of commercial mortgages on properties where repayment is generally dependent on the cash flow from the ongoing operations and activities of the borrower. Like commercial non-real estate, these loans are primarily made based on the identified cash flows of the borrower, but also have the added strength of the value of underlying real estate collateral. Commercial real estate – income producing Commercial real estate – income producing loans consist of loans secured by commercial mortgages on properties where the loan is made to real estate developers or investors and repayment is dependent on the sale, refinance, or income generated from the operation of the property. Properties financed include retail, office, multifamily, senior housing, hotel/motel, skilled nursing facilities and other commercial properties. Construction and land development Construction and land development loans are made to facilitate the acquisition, development, improvement and construction of both commercial and residential-purpose properties. Such loans are made to builders and investors where repayment is expected to be made from the sale, refinance or operation of the property or to businesses to be used in their business operations. This portfolio also includes a small amount of residential construction loans and loans secured by raw land not yet under development. Residential mortgages Residential mortgages consist of closed-end loans secured by first liens on 1- 4 family residential properties. The portfolio includes both fixed and adjustable rate loans, although most longer term, fixed rate loans originated are sold in the secondary mortgage market. Consumer Consumer loans include second lien mortgage home loans, home equity lines of credit and nonresidential consumer purpose loans. Nonresidential consumer loans include both direct and indirect loans. Direct nonresidential consumer loans are made to finance the purchase of personal property, including automobiles, recreational vehicles and boats, and for other personal purposes (secured and unsecured), and deposit account secured loans. Indirect nonresidential consumer loans include automobile financing provided to the consumer through an agreement with automobile dealerships. Consumer loans also include a small portfolio of credit card receivables issued on the basis of applications received through referrals from the Bank’s branches, online and other marketing efforts. Allowance for Loan Losses The following tables show activity in the allowance for loan losses by portfolio class for the three months ended March 31, 2019 and 2018, as well as the corresponding recorded investment in loans at the end of each period. Commercial Total Commercial Commercial real estate- commercial real estate- Construction non-real owner and income and land Residential (in thousands) estate occupied industrial producing development mortgages Consumer Total Three Months Ended March 31, 2019 Allowance for loan losses: Beginning balance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514 Charge-offs (16,344 ) — (16,344 ) (10 ) — (406 ) (4,231 ) (20,991 ) Recoveries 1,926 17 1,943 2 11 162 1,004 3,122 Net provision for loan losses 14,186 33 14,219 3,173 (1,631 ) (3 ) 2,285 18,043 Ending balance $ 97,520 $ 13,807 $ 111,327 $ 20,803 $ 14,027 $ 23,535 $ 24,996 $ 194,688 Ending balance: Allowance: Individually evaluated for impairment $ 1,775 $ 205 $ 1,980 $ 143 $ 1 $ 219 $ 347 $ 2,690 Amounts related to purchased credit impaired loans 288 185 473 35 78 9,162 341 10,089 Collectively evaluated for impairment 95,457 13,417 108,874 20,625 13,948 14,154 24,308 181,909 Total allowance $ 97,520 $ 13,807 $ 111,327 $ 20,803 $ 14,027 $ 23,535 $ 24,996 $ 194,688 Loans: Individually evaluated for impairment $ 231,506 $ 16,974 $ 248,480 $ 2,668 $ 19 $ 5,397 $ 1,508 $ 258,072 Purchased credit impaired loans 6,445 5,472 11,917 4,267 2,897 102,199 3,615 124,895 Collectively evaluated for impairment 8,418,375 2,492,982 10,911,357 2,556,459 1,337,151 2,825,655 2,099,249 19,729,871 Total loans $ 8,656,326 $ 2,515,428 $ 11,171,754 $ 2,563,394 $ 1,340,067 $ 2,933,251 $ 2,104,372 $ 20,112,838 Commercial Total Commercial Commercial real estate- commercial real estate- Construction non-real owner and income and land Residential (in thousands) estate occupied industrial producing development mortgages Consumer Total Three Months Ended March 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 (9,335 ) (851 ) (10,186 ) — (10 ) (192 ) (8,048 ) (18,436 ) Recoveries 4,146 88 4,234 63 29 116 1,794 6,236 Net provision for loan losses 3,877 1,421 5,298 (787 ) 2,533 150 5,059 12,253 Reduction as a result of sale of subsidiary — — — — — — (6,648 ) (6,648 ) Ending balance $ 126,606 $ 13,620 $ 140,226 $ 12,985 $ 9,924 $ 24,918 $ 22,660 $ 210,713 Ending balance: Allowance: Individually evaluated for impairment $ 20,356 $ 2,475 $ 22,831 $ 1,261 $ 1 $ 276 $ 232 $ 24,601 Amounts related to purchased credit impaired loans 471 495 966 576 173 11,720 612 14,047 Collectively evaluated for impairment 105,779 10,650 116,429 11,148 9,750 12,922 21,816 172,065 Total allowance $ 126,606 $ 13,620 $ 140,226 $ 12,985 $ 9,924 $ 24,918 $ 22,660 $ 210,713 Loans: Individually evaluated for impairment $ 323,913 $ 30,318 $ 354,231 $ 14,071 $ 113 $ 8,338 $ 617 $ 377,370 Purchased credit impaired loans 8,510 8,384 16,894 4,361 5,843 116,409 5,876 149,383 Collectively evaluated for impairment 8,003,799 2,146,841 10,150,640 2,376,430 1,407,922 2,608,074 2,022,685 18,565,751 Total loans $ 8,336,222 $ 2,185,543 $ 10,521,765 $ 2,394,862 $ 1,413,878 $ 2,732,821 $ 2,029,178 $ 19,092,504 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. March 31, December 31, (in thousands) 2019 2018 Commercial non-real estate $ 126,992 $ 110,653 Commercial real estate - owner occupied 14,466 16,895 Total commercial and industrial 141,458 127,548 Commercial real estate - income producing 4,205 4,991 Construction and land development 2,013 2,146 Residential mortgages 39,275 35,866 Consumer 17,880 16,744 Total loans $ 204,831 $ 187,295 Nonaccrual loans include nonaccruing loans modified in troubled debt restructurings (“TDRs”) of $105.9 million and $85.5 million at March 31, 2019 and December 31, 2018, respectively. Total TDRs, both accruing and nonaccruing, were $223.4 million at March 31, 2019 and $224.6 million at December 31, 2018. All TDRs are individually evaluated for impairment. At March 31, 2019 and December 31, 2018, the Company had unfunded commitments of $8.5 million and $2.1 million, respectively, to borrowers whose loan terms have been modified in a TDR. The tables below detail by portfolio class TDRs that were modified during the three months ended March 31, 2019 and 2018: Three Months Ended ($ in thousands) March 31, 2019 March 31, 2018 Pre- Modification Post- Modification Pre- Modification Post- Modification Number Outstanding Outstanding Number Outstanding Outstanding of Recorded Recorded of Recorded Recorded Troubled Debt Restructurings: Contracts Investment Investment Contracts Investment Investment Commercial non-real estate 7 $ 13,803 $ 13,803 13 $ 55,482 $ 55,482 Commercial real estate - owner occupied 1 167 167 1 5,909 5,909 Total commercial and industrial 8 13,970 13,970 14 61,391 61,391 Commercial real estate - income producing — — — 1 1,564 1,564 Construction and land development — — — 1 43 43 Residential mortgages 5 1,264 1,264 — — — Consumer 2 46 46 1 222 222 Total loans 15 $ 15,280 $ 15,280 17 $ 63,220 $ 63,220 The TDRs modified during the three months ended March 31, 2019 reflected in the table above include $0.1 million of loans with extended amortization terms or other payment concessions, $8.8 million with significant covenant waivers and $6.4 million with other modifications. The TDRs modified during the three months ended March 31, 2018 include $48.4 million of loans with extended amortization terms or other payment concessions, $14.6 million with significant covenant waivers and $0.2 million with other modifications. There were no defaults on loans during the three months ended March 31, 2019 or 2018 that had been modified in a TDR during the prior twelve months. The tables below present loans that are individually evaluated for impairment disaggregated by portfolio class at March 31, 2019 and December 31, 2018. 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. March 31, 2019 (in thousands) Recorded investment without an allowance Recorded investment with an allowance Unpaid principal balance Related allowance Commercial non-real estate $ 158,767 $ 72,739 $ 278,392 $ 1,775 Commercial real estate - owner occupied 10,442 6,532 20,888 205 Total commercial and industrial 169,209 79,271 299,280 1,980 Commercial real estate - income producing 1,130 1,538 3,403 143 Construction and land development - 19 20 1 Residential mortgages 3,630 1,767 5,942 219 Consumer 471 1,037 1,753 347 Total loans $ 174,440 $ 83,632 $ 310,398 $ 2,690 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 The tables below present the average balances and interest income for total impaired loans for the three months ended March 31, 2019 and 2018. Interest income recognized represents interest on accruing loans modified in a TDR. Three Months Ended March 31, 2019 March 31, 2018 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial non-real estate $ 235,445 $ 1,696 $ 295,897 $ 1,586 Commercial real estate - owner occupied 19,320 80 25,905 66 Total commercial and industrial 254,765 1,776 321,802 1,652 Commercial real estate - income producing 2,685 7 14,801 25 Construction and land development 70 — 238 — Residential mortgages 4,637 5 9,489 5 Consumer 1,258 16 955 9 Total loans $ 263,415 $ 1,804 $ 347,285 $ 1,691 Aging Analysis The tables below present the age analysis of past due loans by portfolio class at March 31, 2019 and December 31, 2018. Purchased credit impaired loans accounted for in pools with an accretable yield are considered to be current. March 31, 2019 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 still accruing (in thousands) Commercial non-real estate $ 19,036 $ 2,527 $ 69,249 $ 90,812 $ 8,565,514 $ 8,656,326 $ 13,920 Commercial real estate - owner occupied 4,543 561 16,336 21,440 2,493,988 2,515,428 3,937 Total commercial and industrial 23,579 3,088 85,585 112,252 11,059,502 11,171,754 17,857 Commercial real estate - income producing 6,124 - 5,854 11,978 2,551,416 2,563,394 1,876 Construction and land development 8,328 186 1,757 10,271 1,329,796 1,340,067 721 Residential mortgages 39,534 8,045 19,299 66,878 2,866,373 2,933,251 679 Consumer 15,738 4,120 9,225 29,083 2,075,289 2,104,372 660 Total $ 93,303 $ 15,439 $ 121,720 $ 230,462 $ 19,882,376 $ 20,112,838 $ 21,793 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 still 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 $ 77,690 $ 26,767 $ 132,593 $ 237,050 $ 19,789,361 $ 20,026,411 $ 14,309 Credit Quality Indicators The following tables present the credit quality indicators by segments and portfolio class of loans at March 31, 2019 and December 31, 2018. March 31, 2019 (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 $ 8,028,706 $ 2,342,948 $ 10,371,654 $ 2,450,517 $ 1,319,519 $ 14,141,690 Pass-Watch 166,406 91,434 257,840 81,718 9,743 349,301 Special Mention 62,830 16,159 78,989 10,760 890 90,639 Substandard 398,384 64,887 463,271 20,399 9,915 493,585 Doubtful — — — — — — Total $ 8,656,326 $ 2,515,428 $ 11,171,754 $ 2,563,394 $ 1,340,067 $ 15,075,215 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 March 31, 2019 December 31, 2018 (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total Performing $ 2,893,635 $ 2,085,456 $ 4,979,091 $ 2,873,669 $ 2,130,395 $ 5,004,064 Nonperforming 39,616 18,916 58,532 36,412 17,472 53,884 Total $ 2,933,251 $ 2,104,372 $ 5,037,623 $ 2,910,081 $ 2,147,867 $ 5,057,948 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 the 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 pledged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. • Doubtful – an asset that has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. • 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 that 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. Purchased Credit Impaired Loans Changes in the carrying amount of purchased credit impaired loans and related accretable yield are presented in the following table for the three months ended March 31, 2019 and the year ended December 31, 2018. March 31, 2019 December 31, 2018 (in thousands) Carrying Amount of Loans Accretable Yield Carrying Amount of Loans Accretable Yield Balance at beginning of period $ 129,596 $ 37,294 $ 153,403 $ 62,517 Payments received, net (8,286 ) (1,100 ) (39,556 ) (5,779 ) Accretion 3,584 (3,584 ) 15,749 (15,749 ) Decrease in expected cash flows based on actual cash flows and changes in cash flow assumptions — (872 ) — (3,695 ) Balance at end of period $ 124,894 $ 31,738 $ 129,596 $ 37,294 Residential Mortgage Loans in Process of Foreclosure Included in loans are $7.3 million and $7.1 million of consumer loans secured by single family residential real estate that are in process of foreclosure as of March 31, 2019 and December 31, 2018, respectively. Loans in process of foreclosure include those for which formal foreclosure proceedings are in process according to local requirements of the applicable jurisdiction. In addition to the single family residential real estate loans in process of foreclosure, the Company also held $2.2 million and $1.8 million of foreclosed single family residential properties in other real estate owned at March 31, 2019 and December 31, 2018, respectively.

Operating Leases

Operating Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Operating Leases	5. Operating Leases Effective January 1, 2019, the Company adopted the amended provisions of Financial Accounting Standards Codification Topic 842, “Leases,” using the modified retrospective approach, impacting the reporting and disclosures for operating leases. The core principle of Topic 842 is that a lessee should recognize in the statement of financial position a liability representing the present value of future lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset over the lease term, as well as the disclosure of key information about operating leasing arrangements. The Company has amended its accounting policy related to leases to comply with the new standard as follows. The Company determines if an arrangement is a lease at inception of the contract and assesses the appropriate classification as finance or operating. Operating leases with terms greater than one year are included in right-of-use lease assets and lease obligations on the Company’s balance sheets. The lease term includes payments to be made in optional or renewal periods only if the lessee is reasonably certain to exercise an option to extend the lease or not to exercise an option to terminate the lease. Right-of-use assets represent the right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term using the interest rate implicit in the contract, when available, or the Company’s incremental collateralized borrowing rate with similar terms. Agreements with both lease and non-lease components are accounted for separately, with only the lease component capitalized. The right-of-use asset is the amount of the lease liability adjusted for prepaid or accrued lease payments, remaining balance of any lease incentives received, unamortized initial direct costs, and impairment. Lease expense is recorded on a straight-line basis over the lease term through amortization of the right-of-use asset plus implicit interest accreted on the operating lease liability obligation, and is reflected in Net Occupancy Expense in the Consolidated Statement of Income. Some of the Company’s leases contain variable components, such as annual changes to rent based on the consumer price index. Operating lease liabilities are not re-measured as a result of changes to variable components unless the lease must be re-measured for some other reason such as a renewal that was not reasonably certain of being exercised. Changes to the variable components are treated as variable lease payments and recognized in the period in which the obligation for those payments was incurred. The standard provides several practical expedients available for use in transition. The Company elected to use the standard’s “package of practical expedients,” which allows the use of previous conclusions about lease identification, lease classification and the accounting treatment for initial direct costs. The Company also elected the short-term lease recognition exemption for all leases with lease terms of one year or less; as such, the Company will not recognize right-of-use assets or lease liabilities on the consolidated balance sheet for such leases. The Company valued its lease obligation using incremental collateralized borrowing rates as of January 1, 2019 for the remaining term of each identified lease. At adoption, the Company recorded a right-of-use asset totaling $115.9 million and a liability for lease payment obligations totaling $130.7 million, offset by the elimination of $14.8 million of existing lease incentive and other deferred rent liabilities. Accounting for leases in accordance with Topic 842 has not had a material impact upon the consolidated results of operations, and is not expected to in future periods. The Company has operating leases on a number of its branches, certain regional headquarters and other properties to limit its exposure to ownership risks such as fluctuations in real estate prices and obsolescence. The Company leases real estate with lease terms generally from five to 20 years, some of which have renewal options from one to 20 years. As these extension options are not generally considered reasonably certain of renewal, they are not included in the lease term. The Company is not a lessee in any contracts classified as finance leases. Supplemental balance sheet information pertaining to operating leases: (dollars in thousands) Three months ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities for operating leases $ 4,007 Right of use assets obtained in exchange for lease liabilities $ 116,618 March 31, 2019 Weighted average remaining lease term (in years) 13.12 Weighted average discount rate 3.56 % The following table sets forth the maturities of the Company’s lease liabilities and the present value discount at March 31, 2019. (in thousands) 2019 $ 12,198 2020 15,421 2021 14,587 2022 14,391 2023 13,109 Thereafter 95,414 Total $ 165,120 Present value discount (36,626 ) Lease liability $ 128,494 The following table sets forth the components of the Company’s lease expense for the three months ended March 31, 2019. (in thousands) Operating lease expense $ 4,253 Short-term lease expense 19 Variable lease expense 12 Sublease income (116 ) Total $ 4,168

Securities Sold under Agreement

Securities Sold under Agreements to Repurchase	3 Months Ended
	Mar. 31, 2019
Brokers And Dealers [Abstract]
Securities Sold under Agreements to Repurchase	6. Securities Sold under Agreements to Repurchase Included in short-term borrowings are customer securities sold under agreements to repurchase (“repurchase agreements”) that mature daily and are secured by U.S. agency securities totaling $478.3 million and $428.6 million at March 31, 2019 and December 31, 2018, respectively. The Company borrows funds on a secured basis by selling securities under agreements to repurchase, mainly in connection with treasury management services offered to its deposit customers. As the Company maintains effective control over assets sold under 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 limited.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	7. Derivatives 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, currently related to select pools of variable rate loans and fixed rate brokered deposits. The Bank also enters into interest rate 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 its 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 or contractual amounts and fair values of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets at March 31, 2019 and December 31, 2018. March 31, 2019 December 31, 2018 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 $ 975,000 $ 9,765 $ 4,899 $ 875,000 $ 3,954 $ 9,173 Interest rate swaps Fair Value 388,110 — 960 483,110 — 2,089 1,363,110 9,765 5,859 1,358,110 3,954 11,262 Derivatives not designated as hedging instruments: Interest rate swaps (2) N/A 1,373,378 28,570 30,506 1,277,404 23,670 24,669 Risk participation agreements N/A 169,317 10 162 171,222 10 131 Forward commitments to sell residential mortgage loans N/A 82,845 21 607 77,208 110 664 Interest rate-lock commitments on residential mortgage loans N/A 69,931 493 1 59,119 464 67 Foreign exchange forward contracts N/A 39,029 482 448 37,749 751 718 Visa Class B derivative contract N/A 43,753 — 6,953 43,753 — 7,304 1,778,253 29,576 38,677 1,666,455 25,005 33,553 Total derivatives $ 3,141,363 $ 39,341 $ 44,536 $ 3,024,565 $ 28,959 $ 44,815 Less: netting adjustment (3) (13,514 ) (26,407 ) (11,979 ) (22,588 ) Total derivative assets/liabilities $ 25,827 $ 18,129 $ 16,980 $ 22,227 (1) Derivative assets and liabilities are reported at fair value 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 pays at a variable rate. During the three months ended March 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, and 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 $1.4 million and $1.0 million for the three months ended March 31, 2019 and 2018, respectively. The notional amounts of the swap agreements in place at March 31, 2019 expire as follows: $50 million in 2021; $475 million in 2022; $350 million in 2023; and $100 million in 2024. Fair The Company enters into 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. 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 The Company is a member of Visa USA. 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. At March 31, 2019 and December 31, 2018 the fair value of the liability associated with this contract was $6.9 million and $7.3 million, respectively. Refer to Note 15 – Fair Value of Financial Instruments for discussion of the valuation inputs for this derivative liability. Effect of Derivative Instruments on the The effects of derivative instruments on the consolidated statements of income for the three months ended March 31, 2019 and 2018 are presented in the table below. For the three months ended March 31, 2019 and 2018, the reduction of interest income attributable to cash flow hedges includes amortization of accumulated other comprehensive loss that resulted from termination of five interest rate swap contracts. Three Months Ended March 31, Derivative Instruments: Location of Gain (Loss) Recognized in the Statement of Income: 2019 2018 Interest rate swaps - cash flow hedges Interest income $ (2,016 ) $ (618 ) Interest rate swaps - fair value hedges Interest expense (988 ) (126 ) All other instruments Other noninterest income 809 1,523 Total $ (2,195 ) $ 779 Credit Risk-Related Contingent Features Certain of the Bank’s derivative instruments contain provisions allowing the financial institution counterparty to terminate the contracts in certain circumstances, such as a 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. At March 31, 2019, the Company was not in violation of any such provisions. Offsetting Assets and Liabilities The Bank’s derivative instruments with 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. Offsetting information in regards to all derivative assets and liabilities, including accrued interest, subject to these master netting agreements at March 31, 2019 and December 31, 2018 is presented in the following tables. (in thousands) Gross Amounts Net Amounts Gross Amounts Not Offset in the Statement of Income Description Gross Amounts Recognized Offset in the Statement of Income Presented in the Statement of Income Financial Instruments Cash Collateral Net Amount As of March 31, 2019 Derivative Assets $ 17,165 $ (15,439 ) $ 1,726 $ 1,726 $ — $ — Derivative Liabilities $ 30,630 $ (26,032 ) $ 4,598 $ 1,726 $ 6,986 $ (4,114 ) (in thousands) Gross Amounts Net Amounts Gross Amounts Not Offset in the Statement of Income Description Gross Amounts Recognized Offset in the Statement of Income Presented in the Statement of Income Financial Instruments Cash Collateral Net Amount As of December 31, 2018 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 ) The Company has excess collateral compared to total exposure due to initial margin requirements for day-to-day rate volatility.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Stockholders Equity Note [Abstract]
Stockholders' Equity	8. Stockholders’ Equity Common Shares Outstanding Common shares outstanding excludes treasury shares totaling 0.9 million at March 31, 2019 and December 31, 2018, with a first-in-first-out cost basis of $16.6 million and $18.5 million at March 31, 2019 and December 31, 2018, respectively. Shares outstanding also excludes unvested restricted share awards totaling 1.3 million at March 31, 2019 and December 31, 2018. Stock Buyback 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. As of March 31, 2019, 200,000 shares of the Company’s common stock had been purchased at an average price of $41.30 per share under this program. Accumulated Other Comprehensive Loss The components of Accumulated Other Comprehensive Loss and changes in those components are presented in the following table.  Available for Sale Securities HTM Securities Transferred from AFS Employee Benefit Plans Cash Flow Hedges Equity Method Investment Total (in thousands) Balance, December 31, 2017 $ (29,512 ) $ (14,585 ) $ (79,078 ) $ (11,227 ) $ — $ (134,402 ) Other comprehensive income/loss before income taxes: Net change in unrealized loss (55,114 ) — — (7,130 ) — (62,244 ) Reclassification of net loss realized and included in earnings — — 1,177 619 — 1,796 Amortization of unrealized net loss on securities transferred to HTM — 755 — — — 755 Income tax expense (benefit) (12,508 ) 171 267 (1,476 ) — (13,546 ) Balance, March 31, 2018 $ (72,118 ) $ (14,001 ) $ (78,168 ) $ (16,262 ) $ — $ (180,549 ) Balance, December 31, 2018 $ (50,125 ) $ (12,044 ) $ (110,247 ) $ (8,293 ) $ — $ (180,709 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain or loss 46,984 — — 9,475 784 57,243 Reclassification of net loss realized and included in earnings — — 2,203 2,016 — 4,219 Amortization of unrealized net loss on securities transferred to HTM — 591 — — — 591 Income tax expense 10,623 134 498 2,598 — 13,853 Balance, March 31, 2019 $ (13,764 ) $ (11,587 ) $ (108,542 ) $ 600 $ 784 $ (132,509 ) Accumulated Other Comprehensive Income or Loss (“AOCI”) is reported as a component of stockholders’ equity. AOCI can include, among other items, unrealized holding gains and losses on securities available for sale (“AFS”), including the Company’s share of unrealized gains and losses reported by a partnership accounted for under the equity method, gains and losses associated with pension or other post-retirement benefits that are not recognized immediately as a component of net periodic benefit cost, and gains and losses on derivative instruments that are designated as, and qualify as, cash flow hedges. Net unrealized gains and losses on AFS securities reclassified as securities held to maturity (“HTM”) also continue to be reported as a component of AOCI and will be amortized over the estimated remaining life of the securities as an adjustment to interest income. 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 or losses on the cash flow hedge of the variable rate loans described in Note 7 will be reclassified into income over the life of the hedge. Accumulated other comprehensive loss resulting from the terminated interest rate swaps will be amortized over the remaining maturities of the designated instruments. Gains and losses within AOCI are net of deferred income taxes, where applicable. The following table shows the line items of the consolidated statements of income affected by amounts reclassified from AOCI.  Three Months Ended Amount reclassified from AOCI (a) March 31, Affected line item on (in thousands) 2019 2018 the statement of income Amortization of unrealized net loss on securities transferred to HTM $ (591 ) $ (755 ) Interest income Tax effect 134 171 Income taxes Net of tax (457 ) (584 ) Net income Amortization of defined benefit pension and post-retirement items (2,203 ) (1,177 ) Other noninterest expense (b) Tax effect 498 267 Income taxes Net of tax (1,705 ) (910 ) Net income Reclassification of unrealized gain (loss) on cash flow hedges (610 ) 336 Interest income Tax effect 138 (76 ) Income taxes Net of tax (472 ) 260 Net income Amortization of loss on terminated cash flow hedges (1,406 ) (954 ) Interest income Tax effect 318 216 Income taxes Net of tax (1,088 ) (738 ) Net income Total reclassifications, net of tax $ (3,722 ) $ (1,972 ) Net income (a) Amounts in parentheses indicate reduction in net income. (b) These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 12 – Retirement Plans for additional details).

Other Noninterest Income

Other Noninterest Income	3 Months Ended
	Mar. 31, 2019
Other Income Disclosure Nonoperating [Abstract]
Other Noninterest Income	9. Other Noninterest Income Components of other noninterest income are as follows: Three Months Ended March 31, (in thousands) 2019 2018 Income from bank-owned life insurance $ 3,265 $ 3,070 Credit related fees 2,595 2,722 Income from derivatives 809 1,523 Gain (loss) on sales of assets 397 (1,207 ) Other miscellaneous 2,402 3,377 Total other noninterest income $ 9,468 $ 9,485

Other Noninterest Expense

Other Noninterest Expense	3 Months Ended
	Mar. 31, 2019
Other Expense Disclosure Nonoperating [Abstract]
Other Noninterest Expense	10. Other Noninterest Expense Components of other noninterest expense are as follows: Three Months Ended March 31, (in thousands) 2019 2018 Advertising $ 3,080 $ 2,526 Corporate value and franchise taxes 4,042 3,440 Printing and supplies 1,169 1,286 Telecommunications and postage 3,466 3,850 Travel expense 1,098 1,066 Entertainment and contributions 2,708 2,518 Tax credit investment amortization 1,138 874 Other retirement expense (4,105 ) (4,463 ) Other miscellaneous 5,691 5,684 Total other noninterest expense $ 18,287 $ 16,781

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Common Share	11. Earnings Per 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 common dividends declared and participation rights in undistributed earnings. Participating securities consist of nonvested 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. Three Months Ended March 31, (in thousands, except per share data) 2019 2018 Numerator: Net income to common shareholders $ 79,164 $ 72,475 Net income allocated to participating securities - basic and diluted 1,337 1,366 Net income allocated to common shareholders - basic and diluted $ 77,827 $ 71,109 Denominator: Weighted-average common shares - basic 85,688 85,241 Dilutive potential common shares 112 182 Weighted-average common shares - diluted 85,800 85,423 Earnings per common share: Basic $ 0.91 $ 0.83 Diluted $ 0.91 $ 0.83 Potential common shares consist of stock options, nonvested performance-based awards, and nonvested restricted share awards deferred under the Company’s nonqualified deferred compensation plan. These potential common shares do not enter into the calculation of diluted earnings per share if the impact would be antidilutive, i.e., increase earnings per share or reduce a loss per share. Weighted average antidilutive potential common shares totaled 1,281 for the three months ended March 31, 2019. There were no antidilutive potential common shares excluded from the calculation of diluted earnings per share for the three months ended March 31, 2018.

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Retirement Plans	12. Retirement Plans The Company sponsors a qualified defined benefit pension plan, the The Company also offers a defined contribution retirement benefit plan, the Hancock Whitney Corporation 401(k) Savings Plan (“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. Beginning January 1, 2018, the Company makes an additional basic contribution to associates hired or rehired after June 30, 2017 in an amount equal to 2% of the associate’s eligible compensation. For Pension Plan participants whose benefits were frozen as of January 1, 2018, the 401(k) Plan provides an enhanced Company contribution 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. Participants vest in basic and enhanced Company contributions upon completion of three years of service. The Company sponsors a nonqualified defined benefit plan covering certain legacy Whitney employees that was frozen as of December 31, 2012 and no future benefits are accrued under this plan. The Company sponsors defined benefit postretirement plans for both legacy Hancock and legacy Whitney employees that provide health care and life insurance benefits. Benefits under the Hancock plan are not available to employees hired on or after January 1, 2000. Benefits under the Whitney plan are restricted to retirees who were already receiving benefits at the time of plan amendments in 2007 or active participants who were eligible to receive benefits as of December 31, 2007. The following tables show the components of net periodic benefits cost included in expense for the plans for the periods indicated.  Other Post- (in thousands) Pension Benefits Retirement Benefits For the Three Months Ended March 31, 2019 2018 2019 2018 Service cost $ 2,775 $ 2,925 $ 29 $ 35 Interest cost 4,863 3,923 128 137 Expected return on plan assets (11,300 ) (9,700 ) — — Amortization of net loss and prior service costs 2,430 1,326 (227 ) (149 ) Net periodic benefit cost (reduction of cost) $ (1,232 ) $ (1,526 ) $ (70 ) $ 23

Share-Based Payment Arrangement

Share-Based Payment Arrangements	3 Months Ended
	Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Payment Arrangements	13. Share-Based Payment Arrangements The Company maintains incentive compensation plans that provide for awards of share-based compensation to employees and directors. These plans have been approved by the Company’s shareholders. Detailed descriptions of these plans were included in Note 17 to the consolidated financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. A summary of stock option activity for the three months ended March 31, 2019 is presented below: Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Shares Price Term (Years) Value ($000) Outstanding at January 1, 2019 46,865 $ 31.88 2.6 $ 164 Exercised/Released — — — Cancelled/Forfeited — — — Expired — — — Outstanding at March 31, 2019 46,865 $ 31.88 2.3 $ 399 Exercisable at March 31, 2019 46,865 $ 31.88 2.3 $ 399 There were no exercises of stock options during the three months ended March 31, 2019. The total intrinsic value of options exercised during the three months ended March 31, 2018 was $0.5 million. The Company’s restricted and performance-based share awards to certain employees and directors are subject to service requirements. A summary of the status of the Company’s nonvested restricted and performance-based share awards at March 31, 2019 and changes during the three months ended March 31, 2019, are presented in the following table. Weighted Average Number of Grant Date Shares Fair Value Nonvested at January 1, 2019 1,494,041 $ 39.89 Granted 72,081 34.20 Vested (8,028 ) 47.17 Forfeited (20,499 ) 38.92 Nonvested at March 31, 2019 1,537,595 $ 39.60 At March 31, 2019, there was $51.0 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 3.3 years. The total fair value of shares which vested during the three months ended March 31, 2019 and 2018 was $0.1 million and $0.3 million, respectively. During the three months ended March 31, 2019, the Company granted 33,691 performance share awards subject to a total shareholder return (“TSR”) performance metric with a grant date fair value of $35.27 per share and 33,691 performance shares subject to an operating earnings per share performance metric with a grant date fair value of $32.15 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 42 regional banks. The fair value of the performance shares subject to TSR at the grant date was determined using a Monte Carlo simulation 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 operating 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 is recognized on a straight line basis over the three-year service period.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	14. Commitments and Contingencies 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. Under regulatory capital guidelines, the Company and Bank must include unfunded commitments meeting certain criteria in risk-weighted capital calculations. 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. The following table presents a summary of the Company’s off-balance sheet financial instruments as of March 31, 2019 and December 31, 2018:  March 31, December 31, (in thousands) 2019 2018 Commitments to extend credit $ 7,198,032 $ 7,234,528 Letters of credit 336,419 365,498 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.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	15. The Financial Accounting Standards Board (“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 and Liabilities Measured on a Recurring Basis The following tables present for each of the fair value hierarchy levels the Company’s assets and liabilities that are measured at fair value on a recurring basis in the consolidated balance sheets at March 31, 2019 and December 31, 2018:  March 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Assets Available for sale debt securities: U.S. Treasury and government agency securities $ — $ 72,143 $ — $ 72,143 Municipal obligations — 245,940 — 245,940 Corporate debt securities — 3,500 — 3,500 Residential mortgage-backed securities — 1,413,032 — 1,413,032 Commercial mortgage-backed securities — 787,834 — 787,834 Collateralized mortgage obligations — 158,631 — 158,631 Total available for sale securities — 2,681,080 — 2,681,080 Derivative assets (1) — 25,827 — 25,827 Total recurring fair value measurements - assets — $ 2,706,907 — $ 2,706,907 Liabilities Derivative liabilities (1) $ — $ 11,176 $ 6,953 $ 18,129 Total recurring fair value measurements - liabilities $ — $ 11,176 $ 6,953 $ 18,129  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 7 - Derivatives. Securities classified as level 2 include obligations of U.S. Government agencies and U.S. Government-sponsored agencies, residential and commercial mortgage-backed securities and collateralized mortgage obligations that are issued or guaranteed by U.S. government agencies, and state and municipal bonds. The level 2 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 and a half years. Company policies generally limit investments to U.S. 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 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 7 – Derivatives for 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 sheets for the three months ended March 31, 2019 and 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) Liability balance at December 31, 2017 $ — Entry into derivative contract 7,304 Liability balance at December 31, 2018 7,304 Cash settlement (414 ) Losses included in earnings 63 Liability balance at March 31, 2019 $ 6,953 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)  Fair Value Level 3 Class March 31, 2019 December 31, 2018 Valuation Technique Unobservable Input Values Utilized Visa Class A appreciation 6% - 18% Derivative liability $ 6,953 $ 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 and foreclosed assets, 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 fair value information presented below is not as of the period end, rather it was as of the date the fair value adjustment was recorded during the twelve months for each of the dates presented below, and excludes nonrecurring fair value measurements of assets no longer on the balance sheet. The following tables present the Company’s financial assets that are measured at fair value on a nonrecurring basis for each of the fair value hierarchy levels.  March 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Collateral-dependent impaired loans $ — $ 163,781 $ — $ 163,781 Other real estate owned and foreclosed assets, net — — 7,688 7,688 Total nonrecurring fair value measurements $ — $ 163,781 $ 7,688 $ 171,469  December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Collateral-dependent impaired loans $ — $ 170,918 $ — $ 170,918 Other real estate owned and foreclosed assets, net — — 14,594 14,594 Total nonrecurring fair value measurements $ — $ 170,918 $ 14,594 $ 185,512 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 these 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 of 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, 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 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 measurement for derivative financial instruments was 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 amounts:  March 31, 2019  Total Fair Carrying (in thousands) Level 1 Level 2 Level 3 Value Amount Financial assets: Cash, interest-bearing bank deposits, and federal funds sold $ 523,956 $ — $ — $ 523,956 $ 523,956 Available for sale securities — 2,681,080 — 2,681,080 2,681,080 Held to maturity securities — 2,892,910 — 2,892,910 2,896,442 Loans, net — 163,781 19,646,070 19,809,851 19,918,150 Loans held for sale — 27,437 — 27,437 27,437 Derivative financial instruments — 25,827 — 25,827 25,827 Financial liabilities: Deposits $ — $ — $ 23,351,829 $ 23,351,829 $ 23,380,294 Federal funds purchased 450 — — 450 450 Securities sold under agreements to repurchase 478,285 — — 478,285 478,285 FHLB short-term borrowings 910,000 — — 910,000 910,000 Long-term debt — 227,206 — 227,206 224,962 Derivative financial instruments — 11,176 6,953 18,129 18,129  December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Fair Value Carrying 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 FHLB short-term 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

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2019
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	16. Recent Accounting Pronouncements Accounting Standards Adopted in 2019 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 are 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 upon adoption. Lessor accounting was largely unchanged under the new guidance, except for clarification of the definition of initial direct costs which provided additional guidance on 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. The Company was required to and did adopt the standard effective January 1, 2019, using the modified retrospective transition method permitted by ASU 2018-11. Thus, the Company’s reporting for the comparative period presented in the financial statements and disclosures continues to be in accordance with GAAP Topic 840. Upon adoption, the Company recorded 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. Accounting for leases in accordance with Topic 842 has not had a material impact upon the consolidated results of operations, and is not expected to in future periods. Refer to Note 5 – Operating Leases for further information related to operating lease accounting policy, practical expedient elections for adoption and operating leasing information at adoption and as of March 31, 2019. 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. The Company is currently assessing the impact of adoption of this guidance upon its pension and postretirement plan disclosures. Adoption of this guidance 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. The Company is currently assessing the impact of adoption of this guidance upon its fair value measurements disclosures. Adoption of this guidance will have no impact upon the Company’s results of operations or financial condition. 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 completed the configuration of a vendor provided software solution for which testing and implementation is expected to be complete in second quarter of 2019. Validation of models began in the first quarter of 2019 and is expected to be completed during the second 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. 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.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Event	17. Subsequent Event On April 30, 2019, the Company announced its entry to an Agreement and Plan of Merger providing for, among other things, the acquisition of MidSouth Bancorp, Inc. (“MidSouth”) (NYSE: MSL), parent company of MidSouth Bank, N.A. At March 31, 2019, MidSouth had approximately $1.7 billion in assets, including $0.9 billion of loans, and $1.4 billion of deposits. Under the terms of the agreement, each share of MidSouth common stock outstanding will convert, pursuant to a fixed conversion ratio, into the right to receive 0.2952 shares of the Company’s common stock. In addition, the merger agreement allows for the redemption of all of MidSouth’s outstanding preferred stock at closing, subject to receipt of applicable governmental approvals. The value of the stock-based consideration will be determined at the time of closing based on the fixed conversion ratio. The approximate transaction value based on an average of the Company’s share price at the date of the agreement, April 30, 2019, was $213 million. The acquisition is subject to the satisfaction of customary closing conditions, including the receipt of regulatory approvals and approval by the shareholders of MidSouth. The transaction is expected to close late in the third quarter of 2019.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Hancock Whitney Corporation and all other entities in which it has a controlling interest (the “Company”). The financial statements include all adjustments that are, in the opinion of management, necessary to fairly state the Company’s financial condition, results of operations, changes in stockholders’ equity and cash flows for the interim periods presented. The Company has also evaluated all subsequent events for potential recognition and disclosure through the date of the filing of this Quarterly Report on Form 10-Q. Some financial information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) have been condensed or omitted in this Quarterly Report on Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. These financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Financial information reported in these financial statements is not necessarily indicative of the Company’s financial condition, results of operations, or cash flows for any other interim or annual period. Certain prior period amounts have been reclassified to conform to the current period presentation. These changes in presentation did not have a material impact on the Company’s financial condition or operating results.
Use of Estimates	Use of Estimates The accounting principles the Company follows and the methods for applying these principles conform to GAAP and general practices followed by the banking industry. These accounting principles 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.
Critical Accounting Policies and Estimates	Critical Accounting Policies and Estimates There were no material changes or developments during the reporting period with respect to methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as disclosed in its Annual Report on Form 10-K for the year ended December 31, 2018. Refer to Note 16 – Recent Accounting Pronouncements for a discussion of accounting standards adopted during the three months ended March 31, 2019.

Acquisition (Tables)

Acquisition (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
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 140,657 Goodwill $ 46,561
Schedule of Goodwill	(in thousands) Goodwill balance at December 31, 2017 $ 745,523 Intital goodwill recorded - 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 Final settlement of cash consideration - acquisition of trust and asset management business 1,112 Goodwill balance at March 31, 2019 $ 792,084

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Amortized Cost and Fair Value of Securities Available for Sale	Securities Available for Sale (in thousands) March 31, 2019 December 31, 2018 Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value U.S. Treasury and government agency securities $ 73,426 — 1,283 $ 72,143 $ 74,339 $ — $ 2,633 $ 71,706 Municipal obligations 245,707 1,833 1,600 245,940 246,713 360 6,646 240,427 Residential mortgage-backed securities 1,418,881 9,964 15,813 1,413,032 1,468,912 4,284 29,794 1,443,402 Commercial mortgage-backed securities 798,447 4,594 15,207 787,834 799,060 1,953 30,936 770,077 Collateralized mortgage obligations 158,904 1,212 1,485 158,631 163,282 903 2,260 161,925 Corporate debt securities 3,500 — — 3,500 3,500 — — 3,500  $ 2,698,865 $ 17,603 $ 35,388 $ 2,681,080 $ 2,755,806 $ 7,500 $ 72,269 $ 2,691,037
Amortized Cost and Fair Value of Securities Held to Maturity	March 31, 2019 December 31, 2018 Gross Gross Gross Securities Held to Maturity 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 — 317 $ 49,683 $ 50,000 $ — $ 478 $ 49,522 Municipal obligations 676,651 11,247 1,726 686,172 688,201 2,347 9,503 681,045 Residential mortgage-backed securities 613,964 3,701 3,148 614,517 640,393 1,461 6,117 635,737 Commercial mortgage-backed securities 356,919 1,233 3,780 354,372 357,175 376 10,882 346,669 Collateralized mortgage obligations 1,198,908 3,285 14,027 1,188,166 1,243,778 1,598 22,493 1,222,883  $ 2,896,442 $ 19,466 $ 22,998 $ 2,892,910 $ 2,979,547 $ 5,782 $ 49,473 $ 2,935,856
Available for Sale Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	Debt Securities Available for Sale Amortized Fair (in thousands) Cost Value Due in one year or less $ 368 $ 374 Due after one year through five years 107,225 108,866 Due after five years through ten years 1,184,905 1,175,070 Due after ten years 1,406,367 1,396,770 Total available for sale debt securities $ 2,698,865 $ 2,681,080
Securities with Unrealized Losses	Available for Sale March 31, 2019 Losses < 12 months Losses 12 months or > Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Treasury and government agency securities $ - - 72,143 1,283 $ 72,143 $ 1,283 Municipal obligations 2,270 40 106,042 1,560 108,312 1,600 Residential mortgage-backed securities 640 6 852,716 15,807 853,356 15,813 Commercial mortgage-backed securities - - 583,978 15,207 583,978 15,207 Collateralized mortgage obligations - - 108,798 1,485 108,798 1,485  $ 2,910 $ 46 $ 1,723,677 $ 35,342 $ 1,726,587 $ 35,388 Available for Sale December 31, 2018 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
Held-to-maturity Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	Debt Securities Held to Maturity Amortized Fair (in thousands) Cost Value Due in one year or less $ 80,915 $ 80,716 Due after one year through five years 67,617 67,418 Due after five years through ten years 1,392,654 1,398,880 Due after ten years 1,355,256 1,345,896 Total held to maturity securities $ 2,896,442 $ 2,892,910
Securities with Unrealized Losses	Held to Maturity March 31, 2019 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 $ — — $ 49,682 $ 317 $ 49,682 $ 317 Municipal obligations 8,750 63 169,931 1,663 178,681 1,726 Residential mortgage-backed securities — — 186,221 3,148 186,221 3,148 Commercial mortgage-backed securities — — 312,296 3,780 312,296 3,780 Collateralized mortgage obligations — — 860,183 14,027 860,183 14,027  $ 8,750 $ 63 $ 1,578,313 $ 22,935 $ 1,587,063 $ 22,998 Held to Maturity December 31, 2018 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

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Loans, Net of Unearned Income	Loans, net of unearned income, by portfolio are presented in the table below. March 31, December 31, (in thousands) 2019 2018 Commercial non-real estate $ 8,656,326 $ 8,620,601 Commercial real estate - owner occupied 2,515,428 2,457,748 Total commercial and industrial 11,171,754 11,078,349 Commercial real estate - income producing 2,563,394 2,341,779 Construction and land development 1,340,067 1,548,335 Residential mortgages 2,933,251 2,910,081 Consumer 2,104,372 2,147,867 Total loans $ 20,112,838 $ 20,026,411
Allowance for Loan Losses by Portfolio Class	The following tables show activity in the allowance for loan losses by portfolio class for the three months ended March 31, 2019 and 2018, as well as the corresponding recorded investment in loans at the end of each period Commercial Total Commercial Commercial real estate- commercial real estate- Construction non-real owner and income and land Residential (in thousands) estate occupied industrial producing development mortgages Consumer Total Three Months Ended March 31, 2019 Allowance for loan losses: Beginning balance $ 97,752 $ 13,757 $ 111,509 $ 17,638 $ 15,647 $ 23,782 $ 25,938 $ 194,514 Charge-offs (16,344 ) — (16,344 ) (10 ) — (406 ) (4,231 ) (20,991 ) Recoveries 1,926 17 1,943 2 11 162 1,004 3,122 Net provision for loan losses 14,186 33 14,219 3,173 (1,631 ) (3 ) 2,285 18,043 Ending balance $ 97,520 $ 13,807 $ 111,327 $ 20,803 $ 14,027 $ 23,535 $ 24,996 $ 194,688 Ending balance: Allowance: Individually evaluated for impairment $ 1,775 $ 205 $ 1,980 $ 143 $ 1 $ 219 $ 347 $ 2,690 Amounts related to purchased credit impaired loans 288 185 473 35 78 9,162 341 10,089 Collectively evaluated for impairment 95,457 13,417 108,874 20,625 13,948 14,154 24,308 181,909 Total allowance $ 97,520 $ 13,807 $ 111,327 $ 20,803 $ 14,027 $ 23,535 $ 24,996 $ 194,688 Loans: Individually evaluated for impairment $ 231,506 $ 16,974 $ 248,480 $ 2,668 $ 19 $ 5,397 $ 1,508 $ 258,072 Purchased credit impaired loans 6,445 5,472 11,917 4,267 2,897 102,199 3,615 124,895 Collectively evaluated for impairment 8,418,375 2,492,982 10,911,357 2,556,459 1,337,151 2,825,655 2,099,249 19,729,871 Total loans $ 8,656,326 $ 2,515,428 $ 11,171,754 $ 2,563,394 $ 1,340,067 $ 2,933,251 $ 2,104,372 $ 20,112,838 Commercial Total Commercial Commercial real estate- commercial real estate- Construction non-real owner and income and land Residential (in thousands) estate occupied industrial producing development mortgages Consumer Total Three Months Ended March 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 (9,335 ) (851 ) (10,186 ) — (10 ) (192 ) (8,048 ) (18,436 ) Recoveries 4,146 88 4,234 63 29 116 1,794 6,236 Net provision for loan losses 3,877 1,421 5,298 (787 ) 2,533 150 5,059 12,253 Reduction as a result of sale of subsidiary — — — — — — (6,648 ) (6,648 ) Ending balance $ 126,606 $ 13,620 $ 140,226 $ 12,985 $ 9,924 $ 24,918 $ 22,660 $ 210,713 Ending balance: Allowance: Individually evaluated for impairment $ 20,356 $ 2,475 $ 22,831 $ 1,261 $ 1 $ 276 $ 232 $ 24,601 Amounts related to purchased credit impaired loans 471 495 966 576 173 11,720 612 14,047 Collectively evaluated for impairment 105,779 10,650 116,429 11,148 9,750 12,922 21,816 172,065 Total allowance $ 126,606 $ 13,620 $ 140,226 $ 12,985 $ 9,924 $ 24,918 $ 22,660 $ 210,713 Loans: Individually evaluated for impairment $ 323,913 $ 30,318 $ 354,231 $ 14,071 $ 113 $ 8,338 $ 617 $ 377,370 Purchased credit impaired loans 8,510 8,384 16,894 4,361 5,843 116,409 5,876 149,383 Collectively evaluated for impairment 8,003,799 2,146,841 10,150,640 2,376,430 1,407,922 2,608,074 2,022,685 18,565,751 Total loans $ 8,336,222 $ 2,185,543 $ 10,521,765 $ 2,394,862 $ 1,413,878 $ 2,732,821 $ 2,029,178 $ 19,092,504
Composition of Nonaccrual Loans by Portfolio Class	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. March 31, December 31, (in thousands) 2019 2018 Commercial non-real estate $ 126,992 $ 110,653 Commercial real estate - owner occupied 14,466 16,895 Total commercial and industrial 141,458 127,548 Commercial real estate - income producing 4,205 4,991 Construction and land development 2,013 2,146 Residential mortgages 39,275 35,866 Consumer 17,880 16,744 Total loans $ 204,831 $ 187,295
Troubled Debt Restructurings Modified by Portfolio Class	The tables below detail by portfolio class TDRs that were modified during the three months ended March 31, 2019 and 2018: Three Months Ended ($ in thousands) March 31, 2019 March 31, 2018 Pre- Modification Post- Modification Pre- Modification Post- Modification Number Outstanding Outstanding Number Outstanding Outstanding of Recorded Recorded of Recorded Recorded Troubled Debt Restructurings: Contracts Investment Investment Contracts Investment Investment Commercial non-real estate 7 $ 13,803 $ 13,803 13 $ 55,482 $ 55,482 Commercial real estate - owner occupied 1 167 167 1 5,909 5,909 Total commercial and industrial 8 13,970 13,970 14 61,391 61,391 Commercial real estate - income producing — — — 1 1,564 1,564 Construction and land development — — — 1 43 43 Residential mortgages 5 1,264 1,264 — — — Consumer 2 46 46 1 222 222 Total loans 15 $ 15,280 $ 15,280 17 $ 63,220 $ 63,220
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class	The tables below present loans that are individually evaluated for impairment disaggregated by portfolio class at March 31, 2019 and December 31, 2018 March 31, 2019 (in thousands) Recorded investment without an allowance Recorded investment with an allowance Unpaid principal balance Related allowance Commercial non-real estate $ 158,767 $ 72,739 $ 278,392 $ 1,775 Commercial real estate - owner occupied 10,442 6,532 20,888 205 Total commercial and industrial 169,209 79,271 299,280 1,980 Commercial real estate - income producing 1,130 1,538 3,403 143 Construction and land development - 19 20 1 Residential mortgages 3,630 1,767 5,942 219 Consumer 471 1,037 1,753 347 Total loans $ 174,440 $ 83,632 $ 310,398 $ 2,690 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 The tables below present the average balances and interest income for total impaired loans for the three months ended March 31, 2019 and 2018. Interest income recognized represents interest on accruing loans modified in a TDR. Three Months Ended March 31, 2019 March 31, 2018 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial non-real estate $ 235,445 $ 1,696 $ 295,897 $ 1,586 Commercial real estate - owner occupied 19,320 80 25,905 66 Total commercial and industrial 254,765 1,776 321,802 1,652 Commercial real estate - income producing 2,685 7 14,801 25 Construction and land development 70 — 238 — Residential mortgages 4,637 5 9,489 5 Consumer 1,258 16 955 9 Total loans $ 263,415 $ 1,804 $ 347,285 $ 1,691
Age Analysis of Past Due Loans by Portfolio Class	The tables below present the age analysis of past due loans by portfolio class at March 31, 2019 and December 31, 2018. Purchased credit impaired loans accounted for in pools with an accretable yield are considered to be current. March 31, 2019 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 still accruing (in thousands) Commercial non-real estate $ 19,036 $ 2,527 $ 69,249 $ 90,812 $ 8,565,514 $ 8,656,326 $ 13,920 Commercial real estate - owner occupied 4,543 561 16,336 21,440 2,493,988 2,515,428 3,937 Total commercial and industrial 23,579 3,088 85,585 112,252 11,059,502 11,171,754 17,857 Commercial real estate - income producing 6,124 - 5,854 11,978 2,551,416 2,563,394 1,876 Construction and land development 8,328 186 1,757 10,271 1,329,796 1,340,067 721 Residential mortgages 39,534 8,045 19,299 66,878 2,866,373 2,933,251 679 Consumer 15,738 4,120 9,225 29,083 2,075,289 2,104,372 660 Total $ 93,303 $ 15,439 $ 121,720 $ 230,462 $ 19,882,376 $ 20,112,838 $ 21,793 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 still 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 $ 77,690 $ 26,767 $ 132,593 $ 237,050 $ 19,789,361 $ 20,026,411 $ 14,309
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield	Changes in the carrying amount of purchased credit impaired loans and related accretable yield are presented in the following table for the three months ended March 31, 2019 and the year ended December 31, 2018. March 31, 2019 December 31, 2018 (in thousands) Carrying Amount of Loans Accretable Yield Carrying Amount of Loans Accretable Yield Balance at beginning of period $ 129,596 $ 37,294 $ 153,403 $ 62,517 Payments received, net (8,286 ) (1,100 ) (39,556 ) (5,779 ) Accretion 3,584 (3,584 ) 15,749 (15,749 ) Decrease in expected cash flows based on actual cash flows and changes in cash flow assumptions — (872 ) — (3,695 ) Balance at end of period $ 124,894 $ 31,738 $ 129,596 $ 37,294
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	The following tables present the credit quality indicators by segments and portfolio class of loans at March 31, 2019 and December 31, 2018. March 31, 2019 (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 $ 8,028,706 $ 2,342,948 $ 10,371,654 $ 2,450,517 $ 1,319,519 $ 14,141,690 Pass-Watch 166,406 91,434 257,840 81,718 9,743 349,301 Special Mention 62,830 16,159 78,989 10,760 890 90,639 Substandard 398,384 64,887 463,271 20,399 9,915 493,585 Doubtful — — — — — — Total $ 8,656,326 $ 2,515,428 $ 11,171,754 $ 2,563,394 $ 1,340,067 $ 15,075,215 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
Residential Mortgage and Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Credit Quality Indicators by Segments and Portfolio Class	March 31, 2019 December 31, 2018 (in thousands) Residential mortgage Consumer Total Residential mortgage Consumer Total Performing $ 2,893,635 $ 2,085,456 $ 4,979,091 $ 2,873,669 $ 2,130,395 $ 5,004,064 Nonperforming 39,616 18,916 58,532 36,412 17,472 53,884 Total $ 2,933,251 $ 2,104,372 $ 5,037,623 $ 2,910,081 $ 2,147,867 $ 5,057,948

Operating Leases (Tables)

Operating Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Summary of Supplemental Balance Sheet Information Pertaining To Operating Leases and Lease Expense	Supplemental balance sheet information pertaining to operating leases: (dollars in thousands) Three months ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities for operating leases $ 4,007 Right of use assets obtained in exchange for lease liabilities $ 116,618 March 31, 2019 Weighted average remaining lease term (in years) 13.12 Weighted average discount rate 3.56 % The following table sets forth the components of the Company’s lease expense for the three months ended March 31, 2019. (in thousands) Operating lease expense $ 4,253 Short-term lease expense 19 Variable lease expense 12 Sublease income (116 ) Total $ 4,168
Summary Maturities of Lease Liabilities and Present Value Discount	The following table sets forth the maturities of the Company’s lease liabilities and the present value discount at March 31, 2019. (in thousands) 2019 $ 12,198 2020 15,421 2021 14,587 2022 14,391 2023 13,109 Thereafter 95,414 Total $ 165,120 Present value discount (36,626 ) Lease liability $ 128,494

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair Values of Derivative Financial Instruments	The table below presents the notional or contractual amounts and fair values of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheets at March 31, 2019 and December 31, 2018. March 31, 2019 December 31, 2018 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 $ 975,000 $ 9,765 $ 4,899 $ 875,000 $ 3,954 $ 9,173 Interest rate swaps Fair Value 388,110 — 960 483,110 — 2,089 1,363,110 9,765 5,859 1,358,110 3,954 11,262 Derivatives not designated as hedging instruments: Interest rate swaps (2) N/A 1,373,378 28,570 30,506 1,277,404 23,670 24,669 Risk participation agreements N/A 169,317 10 162 171,222 10 131 Forward commitments to sell residential mortgage loans N/A 82,845 21 607 77,208 110 664 Interest rate-lock commitments on residential mortgage loans N/A 69,931 493 1 59,119 464 67 Foreign exchange forward contracts N/A 39,029 482 448 37,749 751 718 Visa Class B derivative contract N/A 43,753 — 6,953 43,753 — 7,304 1,778,253 29,576 38,677 1,666,455 25,005 33,553 Total derivatives $ 3,141,363 $ 39,341 $ 44,536 $ 3,024,565 $ 28,959 $ 44,815 Less: netting adjustment (3) (13,514 ) (26,407 ) (11,979 ) (22,588 ) Total derivative assets/liabilities $ 25,827 $ 18,129 $ 16,980 $ 22,227 (1) Derivative assets and liabilities are reported at fair value 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.
Effects of Derivative Instruments on the Statement of Income	Three Months Ended March 31, Derivative Instruments: Location of Gain (Loss) Recognized in the Statement of Income: 2019 2018 Interest rate swaps - cash flow hedges Interest income $ (2,016 ) $ (618 ) Interest rate swaps - fair value hedges Interest expense (988 ) (126 ) All other instruments Other noninterest income 809 1,523 Total $ (2,195 ) $ 779
Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements	(in thousands) Gross Amounts Net Amounts Gross Amounts Not Offset in the Statement of Income Description Gross Amounts Recognized Offset in the Statement of Income Presented in the Statement of Income Financial Instruments Cash Collateral Net Amount As of March 31, 2019 Derivative Assets $ 17,165 $ (15,439 ) $ 1,726 $ 1,726 $ — $ — Derivative Liabilities $ 30,630 $ (26,032 ) $ 4,598 $ 1,726 $ 6,986 $ (4,114 ) (in thousands) Gross Amounts Net Amounts Gross Amounts Not Offset in the Statement of Income Description Gross Amounts Recognized Offset in the Statement of Income Presented in the Statement of Income Financial Instruments Cash Collateral Net Amount As of December 31, 2018 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 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Stockholders Equity Note [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	 Available for Sale Securities HTM Securities Transferred from AFS Employee Benefit Plans Cash Flow Hedges Equity Method Investment Total (in thousands) Balance, December 31, 2017 $ (29,512 ) $ (14,585 ) $ (79,078 ) $ (11,227 ) $ — $ (134,402 ) Other comprehensive income/loss before income taxes: Net change in unrealized loss (55,114 ) — — (7,130 ) — (62,244 ) Reclassification of net loss realized and included in earnings — — 1,177 619 — 1,796 Amortization of unrealized net loss on securities transferred to HTM — 755 — — — 755 Income tax expense (benefit) (12,508 ) 171 267 (1,476 ) — (13,546 ) Balance, March 31, 2018 $ (72,118 ) $ (14,001 ) $ (78,168 ) $ (16,262 ) $ — $ (180,549 ) Balance, December 31, 2018 $ (50,125 ) $ (12,044 ) $ (110,247 ) $ (8,293 ) $ — $ (180,709 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain or loss 46,984 — — 9,475 784 57,243 Reclassification of net loss realized and included in earnings — — 2,203 2,016 — 4,219 Amortization of unrealized net loss on securities transferred to HTM — 591 — — — 591 Income tax expense 10,623 134 498 2,598 — 13,853 Balance, March 31, 2019 $ (13,764 ) $ (11,587 ) $ (108,542 ) $ 600 $ 784 $ (132,509 )
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income	 Three Months Ended Amount reclassified from AOCI (a) March 31, Affected line item on (in thousands) 2019 2018 the statement of income Amortization of unrealized net loss on securities transferred to HTM $ (591 ) $ (755 ) Interest income Tax effect 134 171 Income taxes Net of tax (457 ) (584 ) Net income Amortization of defined benefit pension and post-retirement items (2,203 ) (1,177 ) Other noninterest expense (b) Tax effect 498 267 Income taxes Net of tax (1,705 ) (910 ) Net income Reclassification of unrealized gain (loss) on cash flow hedges (610 ) 336 Interest income Tax effect 138 (76 ) Income taxes Net of tax (472 ) 260 Net income Amortization of loss on terminated cash flow hedges (1,406 ) (954 ) Interest income Tax effect 318 216 Income taxes Net of tax (1,088 ) (738 ) Net income Total reclassifications, net of tax $ (3,722 ) $ (1,972 ) Net income (a) Amounts in parentheses indicate reduction in net income. (b) These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 12 – Retirement Plans for additional details).

Other Noninterest Income (Table

Other Noninterest Income (Tables)	3 Months Ended
	Mar. 31, 2019
Other Income Disclosure Nonoperating [Abstract]
Components of Other Noninterest Income	Three Months Ended March 31, (in thousands) 2019 2018 Income from bank-owned life insurance $ 3,265 $ 3,070 Credit related fees 2,595 2,722 Income from derivatives 809 1,523 Gain (loss) on sales of assets 397 (1,207 ) Other miscellaneous 2,402 3,377 Total other noninterest income $ 9,468 $ 9,485

Other Noninterest Expense (Tabl

Other Noninterest Expense (Tables)	3 Months Ended
	Mar. 31, 2019
Other Expense Disclosure Nonoperating [Abstract]
Components of Other Noninterest Expense	Three Months Ended March 31, (in thousands) 2019 2018 Advertising $ 3,080 $ 2,526 Corporate value and franchise taxes 4,042 3,440 Printing and supplies 1,169 1,286 Telecommunications and postage 3,466 3,850 Travel expense 1,098 1,066 Entertainment and contributions 2,708 2,518 Tax credit investment amortization 1,138 874 Other retirement expense (4,105 ) (4,463 ) Other miscellaneous 5,691 5,684 Total other noninterest expense $ 18,287 $ 16,781

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	Three Months Ended March 31, (in thousands, except per share data) 2019 2018 Numerator: Net income to common shareholders $ 79,164 $ 72,475 Net income allocated to participating securities - basic and diluted 1,337 1,366 Net income allocated to common shareholders - basic and diluted $ 77,827 $ 71,109 Denominator: Weighted-average common shares - basic 85,688 85,241 Dilutive potential common shares 112 182 Weighted-average common shares - diluted 85,800 85,423 Earnings per common share: Basic $ 0.91 $ 0.83 Diluted $ 0.91 $ 0.83

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Components of Net Periodic Benefits Cost	 Other Post- (in thousands) Pension Benefits Retirement Benefits For the Three Months Ended March 31, 2019 2018 2019 2018 Service cost $ 2,775 $ 2,925 $ 29 $ 35 Interest cost 4,863 3,923 128 137 Expected return on plan assets (11,300 ) (9,700 ) — — Amortization of net loss and prior service costs 2,430 1,326 (227 ) (149 ) Net periodic benefit cost (reduction of cost) $ (1,232 ) $ (1,526 ) $ (70 ) $ 23

Share-Based Payment Arrangeme_2

Share-Based Payment Arrangements (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Option Activity	Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Shares Price Term (Years) Value ($000) Outstanding at January 1, 2019 46,865 $ 31.88 2.6 $ 164 Exercised/Released — — — Cancelled/Forfeited — — — Expired — — — Outstanding at March 31, 2019 46,865 $ 31.88 2.3 $ 399 Exercisable at March 31, 2019 46,865 $ 31.88 2.3 $ 399
Summary of Nonvested Restricted and Performance Shares	Weighted Average Number of Grant Date Shares Fair Value Nonvested at January 1, 2019 1,494,041 $ 39.89 Granted 72,081 34.20 Vested (8,028 ) 47.17 Forfeited (20,499 ) 38.92 Nonvested at March 31, 2019 1,537,595 $ 39.60

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Off-Balance Sheet Financial Instruments	The following table presents a summary of the Company’s off-balance sheet financial instruments as of March 31, 2019 and December 31, 2018:  March 31, December 31, (in thousands) 2019 2018 Commitments to extend credit $ 7,198,032 $ 7,234,528 Letters of credit 336,419 365,498

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables present for each of the fair value hierarchy levels the Company’s assets and liabilities that are measured at fair value on a recurring basis in the consolidated balance sheets at March 31, 2019 and December 31, 2018:  March 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Assets Available for sale debt securities: U.S. Treasury and government agency securities $ — $ 72,143 $ — $ 72,143 Municipal obligations — 245,940 — 245,940 Corporate debt securities — 3,500 — 3,500 Residential mortgage-backed securities — 1,413,032 — 1,413,032 Commercial mortgage-backed securities — 787,834 — 787,834 Collateralized mortgage obligations — 158,631 — 158,631 Total available for sale securities — 2,681,080 — 2,681,080 Derivative assets (1) — 25,827 — 25,827 Total recurring fair value measurements - assets — $ 2,706,907 — $ 2,706,907 Liabilities Derivative liabilities (1) $ — $ 11,176 $ 6,953 $ 18,129 Total recurring fair value measurements - liabilities $ — $ 11,176 $ 6,953 $ 18,129  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 7 - Derivatives.
Consolidated Balance Sheets for Financial Instruments of Material Nature Measured at Fair Value on Recurring Basis	The table below presents a rollforward of the amounts on the consolidated balance sheets for the three months ended March 31, 2019 and 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) Liability balance at December 31, 2017 $ — Entry into derivative contract 7,304 Liability balance at December 31, 2018 7,304 Cash settlement (414 ) Losses included in earnings 63 Liability balance at March 31, 2019 $ 6,953
Overview of the Valuation Techniques and Significant Unobservable Inputs	($ in thousands)  Fair Value Level 3 Class March 31, 2019 December 31, 2018 Valuation Technique Unobservable Input Values Utilized Visa Class A appreciation 6% - 18% Derivative liability $ 6,953 $ 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	The following tables present the Company’s financial assets that are measured at fair value on a nonrecurring basis for each of the fair value hierarchy levels.  March 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Collateral-dependent impaired loans $ — $ 163,781 $ — $ 163,781 Other real estate owned and foreclosed assets, net — — 7,688 7,688 Total nonrecurring fair value measurements $ — $ 163,781 $ 7,688 $ 171,469  December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Collateral-dependent impaired loans $ — $ 170,918 $ — $ 170,918 Other real estate owned and foreclosed assets, net — — 14,594 14,594 Total nonrecurring fair value measurements $ — $ 170,918 $ 14,594 $ 185,512
Estimated Fair Values of Financial Instruments	The following tables present the estimated fair values of the Company’s financial instruments by fair value hierarchy levels and the corresponding carrying amounts:  March 31, 2019  Total Fair Carrying (in thousands) Level 1 Level 2 Level 3 Value Amount Financial assets: Cash, interest-bearing bank deposits, and federal funds sold $ 523,956 $ — $ — $ 523,956 $ 523,956 Available for sale securities — 2,681,080 — 2,681,080 2,681,080 Held to maturity securities — 2,892,910 — 2,892,910 2,896,442 Loans, net — 163,781 19,646,070 19,809,851 19,918,150 Loans held for sale — 27,437 — 27,437 27,437 Derivative financial instruments — 25,827 — 25,827 25,827 Financial liabilities: Deposits $ — $ — $ 23,351,829 $ 23,351,829 $ 23,380,294 Federal funds purchased 450 — — 450 450 Securities sold under agreements to repurchase 478,285 — — 478,285 478,285 FHLB short-term borrowings 910,000 — — 910,000 910,000 Long-term debt — 227,206 — 227,206 224,962 Derivative financial instruments — 11,176 6,953 18,129 18,129  December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Fair Value Carrying 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 FHLB short-term 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

Acquisition (Narrative) (Detail

Acquisition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jul. 13, 2018
Business Acquisition [Line Items]
Useful life	17 years
Acquisition related costs	$ 0.3
Capital One [Member]
Business Acquisition [Line Items]
Assets under management		$ 4,000
Assets under management and administration		10,400
Cash for customer deposit liabilities assumed		$ 217
Trust And Asset Management Acquisition [Member]
Business Acquisition [Line Items]
Trust fee revenue	4.9
Related expense	$ 4.8

Acquisition (Schedule of Fair V

Acquisition (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed - Capital One) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 792,084	$ 790,972	$ 745,523
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	140,657
Goodwill	$ 46,561

Acquisition (Schedule of Goodwi

Acquisition (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Goodwill, Beginning Balance	$ 790,972	$ 745,523
Intital goodwill recorded - acquisition of trust and asset management business		45,634
Measurement period adjustments - acquisition of trust and asset management business		(185)
Final settlement of cash consideration - acquisition of trust and asset management business	1,112
Goodwill, Ending Balance	$ 792,084	$ 790,972

Securities (Amortized Cost and

Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,698,865	$ 2,755,806
Securities Available for Sale, Gross Unrealized Gains	17,603	7,500
Securities Available for Sale, Gross Unrealized Losses	35,388	72,269
Securities Available for Sale, Fair Value	2,681,080	2,691,037
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	73,426	74,339
Securities Available for Sale, Gross Unrealized Losses	1,283	2,633
Securities Available for Sale, Fair Value	72,143	71,706
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	245,707	246,713
Securities Available for Sale, Gross Unrealized Gains	1,833	360
Securities Available for Sale, Gross Unrealized Losses	1,600	6,646
Securities Available for Sale, Fair Value	245,940	240,427
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,418,881	1,468,912
Securities Available for Sale, Gross Unrealized Gains	9,964	4,284
Securities Available for Sale, Gross Unrealized Losses	15,813	29,794
Securities Available for Sale, Fair Value	1,413,032	1,443,402
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	798,447	799,060
Securities Available for Sale, Gross Unrealized Gains	4,594	1,953
Securities Available for Sale, Gross Unrealized Losses	15,207	30,936
Securities Available for Sale, Fair Value	787,834	770,077
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	158,904	163,282
Securities Available for Sale, Gross Unrealized Gains	1,212	903
Securities Available for Sale, Gross Unrealized Losses	1,485	2,260
Securities Available for Sale, Fair Value	158,631	161,925
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	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	$ 2,896,442	$ 2,979,547
Securities Held to Maturity, Gross Unrealized Gains	19,466	5,782
Securities Held to Maturity, Gross Unrealized Losses	22,998	49,473
Securities Held to Maturity, Fair Value	2,892,910	2,935,856
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	317	478
Securities Held to Maturity, Fair Value	49,683	49,522
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	676,651	688,201
Securities Held to Maturity, Gross Unrealized Gains	11,247	2,347
Securities Held to Maturity, Gross Unrealized Losses	1,726	9,503
Securities Held to Maturity, Fair Value	686,172	681,045
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	613,964	640,393
Securities Held to Maturity, Gross Unrealized Gains	3,701	1,461
Securities Held to Maturity, Gross Unrealized Losses	3,148	6,117
Securities Held to Maturity, Fair Value	614,517	635,737
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	356,919	357,175
Securities Held to Maturity, Gross Unrealized Gains	1,233	376
Securities Held to Maturity, Gross Unrealized Losses	3,780	10,882
Securities Held to Maturity, Fair Value	354,372	346,669
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Amortized Cost	1,198,908	1,243,778
Securities Held to Maturity, Gross Unrealized Gains	3,285	1,598
Securities Held to Maturity, Gross Unrealized Losses	14,027	22,493
Securities Held to Maturity, Fair Value	$ 1,188,166	$ 1,222,883

Securities (Amortized Cost an_3

Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 368
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	107,225
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	1,184,905
Debt Securities Available for Sale, Due after ten years, Amortized Cost	1,406,367
Total available for sale debt securities, Amortized Cost	2,698,865
Debt Securities Available for Sale, Due in one year or less, Fair Value	374
Debt Securities Available for Sale, Due after one year through five years, Fair Value	108,866
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	1,175,070
Debt Securities Available for Sale, Due after ten years, Fair Value	1,396,770
Total available for sale debt securities, Fair Value	2,681,080
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	80,915
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	67,617
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	1,392,654
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	1,355,256
Total held to maturity debt securities, Amortized Cost	2,896,442	$ 2,979,547
Debt Securities Held to Maturity, Due in one year or less, Fair Value	80,716
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	67,418
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	1,398,880
Debt Securities Held to Maturity, Due after ten years, Fair Value	1,345,896
Total held to maturity debt securities, Fair Value	$ 2,892,910	$ 2,935,856

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Securities classified as trading	$ 0	$ 0
Securities pledged as collateral	$ 3,700,000,000	$ 3,400,000,000

Securities (Securities Availabl

Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 2,910	$ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses	46	4,928
Available for sale, Losses 12 months or longer, Fair Value	1,723,677	1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	35,342	67,340
Available for sale, Total, Fair Value	1,726,587	2,130,477
Available for sale, Total, Gross Unrealized Losses	35,388	72,268
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses 12 months or longer, Fair Value	72,143	71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,283	2,633
Available for sale, Total, Fair Value	72,143	71,706
Available for sale, Total, Gross Unrealized Losses	1,283	2,633
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	2,270	41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses	40	591
Available for sale, Losses 12 months or longer, Fair Value	106,042	170,883
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,560	6,054
Available for sale, Total, Fair Value	108,312	212,086
Available for sale, Total, Gross Unrealized Losses	1,600	6,645
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	640	305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses	6	2,485
Available for sale, Losses 12 months or longer, Fair Value	852,716	762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	15,807	27,309
Available for sale, Total, Fair Value	853,356	1,067,916
Available for sale, Total, Gross Unrealized Losses	15,813	29,794
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
Available for sale, Losses less than 12 months, Gross Unrealized Losses		1,851
Available for sale, Losses 12 months or longer, Fair Value	583,978	570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	15,207	29,085
Available for sale, Total, Fair Value	583,978	666,711
Available for sale, Total, Gross Unrealized Losses	15,207	30,936
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		254
Available for sale, Losses less than 12 months, Gross Unrealized Losses		1
Available for sale, Losses 12 months or longer, Fair Value	108,798	111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,485	2,259
Available for sale, Total, Fair Value	108,798	112,058
Available for sale, Total, Gross Unrealized Losses	$ 1,485	$ 2,260

Securities (Securities Held to

Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	$ 8,750	$ 401,593
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	63	2,660
Held to Maturity, Losses 12 months or longer, Fair Value	1,578,313	1,720,624
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	22,935	46,813
Held to Maturity, Total, Fair Value	1,587,063	2,122,217
Held to Maturity, Total, Gross Unrealized Losses	22,998	49,473
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	49,682	49,521
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	317	478
Held to Maturity, Total, Fair Value	49,682	49,521
Held to Maturity, Total, Gross Unrealized Losses	317	478
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	8,750	233,469
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	63	2,256
Held to Maturity, Losses 12 months or longer, Fair Value	169,931	233,280
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	1,663	7,247
Held to Maturity, Total, Fair Value	178,681	466,749
Held to Maturity, Total, Gross Unrealized Losses	1,726	9,503
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
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses		123
Held to Maturity, Losses 12 months or longer, Fair Value	186,221	235,251
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	3,148	5,994
Held to Maturity, Total, Fair Value	186,221	325,981
Held to Maturity, Total, Gross Unrealized Losses	3,148	6,117
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses 12 months or longer, Fair Value	312,296	305,419
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	3,780	10,882
Held to Maturity, Total, Fair Value	312,296	305,419
Held to Maturity, Total, Gross Unrealized Losses	3,780	10,882
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value		77,394
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses		281
Held to Maturity, Losses 12 months or longer, Fair Value	860,183	897,153
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	14,027	22,212
Held to Maturity, Total, Fair Value	860,183	974,547
Held to Maturity, Total, Gross Unrealized Losses	$ 14,027	$ 22,493

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 20,112,838	$ 20,026,411	$ 19,092,504
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,933,251	2,910,081	2,732,821
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,104,372	2,147,867	2,029,178
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,563,394	2,341,779	2,394,862
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,340,067	1,548,335	1,413,878
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	11,171,754	11,078,349	10,521,765
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	8,656,326	8,620,601	8,336,222
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 2,515,428	$ 2,457,748	$ 2,185,543

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses (Allowance for Loan Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 194,514	$ 217,308
Allowance for loan losses: Net provision for loan losses	18,043	12,253
Reduction as a result of sale of subsidiary		(6,648)
Allowance for loan losses: Ending balance	194,688	210,713
Allowance for loan losses: Individually evaluated for impairment	2,690	24,601
Allowance for loan losses: Amounts related to purchased credit impaired loans	10,089	14,047
Allowance for loan losses: Collectively evaluated for impairment	181,909	172,065
Loans: Individually evaluated for impairment	258,072	377,370
Loans: Purchased credit impaired loans	124,895	149,383
Loans: Collectively evaluated for impairment	19,729,871	18,565,751
Loans receivable	20,112,838	19,092,504	$ 20,026,411
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(20,991)	(18,436)
Allowance for loan losses: Recoveries	3,122	6,236
Allowance for loan losses: Net provision for loan losses	18,043	12,253
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	17,638	13,709
Allowance for loan losses: Ending balance	20,803	12,985
Allowance for loan losses: Individually evaluated for impairment	143	1,261
Allowance for loan losses: Amounts related to purchased credit impaired loans	35	576
Allowance for loan losses: Collectively evaluated for impairment	20,625	11,148
Loans: Individually evaluated for impairment	2,668	14,071
Loans: Purchased credit impaired loans	4,267	4,361
Loans: Collectively evaluated for impairment	2,556,459	2,376,430
Loans receivable	2,563,394	2,394,862	2,341,779
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	15,647	7,372
Allowance for loan losses: Ending balance	14,027	9,924
Allowance for loan losses: Individually evaluated for impairment	1	1
Allowance for loan losses: Amounts related to purchased credit impaired loans	78	173
Allowance for loan losses: Collectively evaluated for impairment	13,948	9,750
Loans: Individually evaluated for impairment	19	113
Loans: Purchased credit impaired loans	2,897	5,843
Loans: Collectively evaluated for impairment	1,337,151	1,407,922
Loans receivable	1,340,067	1,413,878	1,548,335
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(10)
Allowance for loan losses: Recoveries	2	63
Allowance for loan losses: Net provision for loan losses	3,173	(787)
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs		(10)
Allowance for loan losses: Recoveries	11	29
Allowance for loan losses: Net provision for loan losses	(1,631)	2,533
Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	111,509	140,880
Allowance for loan losses: Ending balance	111,327	140,226
Allowance for loan losses: Individually evaluated for impairment	1,980	22,831
Allowance for loan losses: Amounts related to purchased credit impaired loans	473	966
Allowance for loan losses: Collectively evaluated for impairment	108,874	116,429
Loans: Individually evaluated for impairment	248,480	354,231
Loans: Purchased credit impaired loans	11,917	16,894
Loans: Collectively evaluated for impairment	10,911,357	10,150,640
Loans receivable	11,171,754	10,521,765	11,078,349
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	97,752	127,918
Allowance for loan losses: Ending balance	97,520	126,606
Allowance for loan losses: Individually evaluated for impairment	1,775	20,356
Allowance for loan losses: Amounts related to purchased credit impaired loans	288	471
Allowance for loan losses: Collectively evaluated for impairment	95,457	105,779
Loans: Individually evaluated for impairment	231,506	323,913
Loans: Purchased credit impaired loans	6,445	8,510
Loans: Collectively evaluated for impairment	8,418,375	8,003,799
Loans receivable	8,656,326	8,336,222	8,620,601
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	13,757	12,962
Allowance for loan losses: Ending balance	13,807	13,620
Allowance for loan losses: Individually evaluated for impairment	205	2,475
Allowance for loan losses: Amounts related to purchased credit impaired loans	185	495
Allowance for loan losses: Collectively evaluated for impairment	13,417	10,650
Loans: Individually evaluated for impairment	16,974	30,318
Loans: Purchased credit impaired loans	5,472	8,384
Loans: Collectively evaluated for impairment	2,492,982	2,146,841
Loans receivable	2,515,428	2,185,543	2,457,748
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(16,344)	(10,186)
Allowance for loan losses: Recoveries	1,943	4,234
Allowance for loan losses: Net provision for loan losses	14,219	5,298
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(16,344)	(9,335)
Allowance for loan losses: Recoveries	1,926	4,146
Allowance for loan losses: Net provision for loan losses	14,186	3,877
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs		(851)
Allowance for loan losses: Recoveries	17	88
Allowance for loan losses: Net provision for loan losses	33	1,421
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	23,782	24,844
Allowance for loan losses: Ending balance	23,535	24,918
Allowance for loan losses: Individually evaluated for impairment	219	276
Allowance for loan losses: Amounts related to purchased credit impaired loans	9,162	11,720
Allowance for loan losses: Collectively evaluated for impairment	14,154	12,922
Loans: Individually evaluated for impairment	5,397	8,338
Loans: Purchased credit impaired loans	102,199	116,409
Loans: Collectively evaluated for impairment	2,825,655	2,608,074
Loans receivable	2,933,251	2,732,821	2,910,081
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(406)	(192)
Allowance for loan losses: Recoveries	162	116
Allowance for loan losses: Net provision for loan losses	(3)	150
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	25,938	30,503
Reduction as a result of sale of subsidiary		(6,648)
Allowance for loan losses: Ending balance	24,996	22,660
Allowance for loan losses: Individually evaluated for impairment	347	232
Allowance for loan losses: Amounts related to purchased credit impaired loans	341	612
Allowance for loan losses: Collectively evaluated for impairment	24,308	21,816
Loans: Individually evaluated for impairment	1,508	617
Loans: Purchased credit impaired loans	3,615	5,876
Loans: Collectively evaluated for impairment	2,099,249	2,022,685
Loans receivable	2,104,372	2,029,178	$ 2,147,867
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(4,231)	(8,048)
Allowance for loan losses: Recoveries	1,004	1,794
Allowance for loan losses: Net provision for loan losses	$ 2,285	$ 5,059

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 204,831	$ 187,295
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,205	4,991
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,013	2,146
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	39,275	35,866
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,880	16,744
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	141,458	127,548
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	126,992	110,653
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 14,466	$ 16,895

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan	Dec. 31, 2018USD ($)
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 204,831		$ 187,295
TDRs both accruing and nonaccruing	223,400		224,600
Unfunded commitment to borrowers related to modified TDR	8,500		2,100
TDRs and loans impaired with minimum aggregate relationship balances	1,000
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	17,880		16,744
Real estate in process of foreclosure	7,300		7,100
Real estate acquired through foreclosure	2,200		1,800
Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 105,900		$ 85,500
Number of TDRs subsequently defaulted | loan	0	0
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]
Accounts Notes And Loans Receivable [Line Items]
Extended terms and other payment concessions	$ 100	$ 48,400
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]
Accounts Notes And Loans Receivable [Line Items]
Covenant waivers	8,800	14,600
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts Notes And Loans Receivable [Line Items]
Other modifications	$ 6,400	$ 200

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	15	17
Pre-Modification Outstanding Recorded Investment	$ 15,280	$ 63,220
Post-Modification Outstanding Recorded Investment	$ 15,280	$ 63,220
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 1,564
Post-Modification Outstanding Recorded Investment		$ 1,564
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 43
Post-Modification Outstanding Recorded Investment		$ 43
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5
Pre-Modification Outstanding Recorded Investment	$ 1,264
Post-Modification Outstanding Recorded Investment	$ 1,264
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	1
Pre-Modification Outstanding Recorded Investment	$ 46	$ 222
Post-Modification Outstanding Recorded Investment	$ 46	$ 222
Total Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	8	14
Pre-Modification Outstanding Recorded Investment	$ 13,970	$ 61,391
Post-Modification Outstanding Recorded Investment	$ 13,970	$ 61,391
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	7	13
Pre-Modification Outstanding Recorded Investment	$ 13,803	$ 55,482
Post-Modification Outstanding Recorded Investment	$ 13,803	$ 55,482
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 167	$ 5,909
Post-Modification Outstanding Recorded Investment	$ 167	$ 5,909

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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	$ 174,440		$ 161,227
Recorded investment with an allowance	83,632		107,528
Unpaid principal balance	310,398		308,401
Related allowance	2,690		5,114
Average recorded investment	263,415	$ 347,285
Interest income recognized	1,804	1,691
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	1,130		1,138
Recorded investment with an allowance	1,538		1,563
Unpaid principal balance	3,403		3,428
Related allowance	143		210
Average recorded investment	2,685	14,801
Interest income recognized	7	25
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance			100
Recorded investment with an allowance	19		21
Unpaid principal balance	20		121
Related allowance	1		1
Average recorded investment	70	238
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	3,630		2,058
Recorded investment with an allowance	1,767		1,818
Unpaid principal balance	5,942		4,421
Related allowance	219		444
Average recorded investment	4,637	9,489
Interest income recognized	5	5
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	471		279
Recorded investment with an allowance	1,037		728
Unpaid principal balance	1,753		1,253
Related allowance	347		216
Average recorded investment	1,258	955
Interest income recognized	16	9
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	169,209		157,652
Recorded investment with an allowance	79,271		103,398
Unpaid principal balance	299,280		299,178
Related allowance	1,980		4,243
Average recorded investment	254,765	321,802
Interest income recognized	1,776	1,652
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	158,767		144,625
Recorded investment with an allowance	72,739		94,759
Unpaid principal balance	278,392		273,290
Related allowance	1,775		3,636
Average recorded investment	235,445	295,897
Interest income recognized	1,696	1,586
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment without an allowance	10,442		13,027
Recorded investment with an allowance	6,532		8,639
Unpaid principal balance	20,888		25,888
Related allowance	205		$ 607
Average recorded investment	19,320	25,905
Interest income recognized	$ 80	$ 66

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 230,462	$ 237,050
Current	19,882,376	19,789,361
Total loans	20,112,838	20,026,411	$ 19,092,504
Recorded Investment > 90 Days and Accruing	21,793	14,309
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	93,303	77,690
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,439	26,767
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	121,720	132,593
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,978	8,638
Current	2,551,416	2,333,141
Total loans	2,563,394	2,341,779	2,394,862
Recorded Investment > 90 Days and Accruing	1,876	1,844
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	6,124	2,371
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
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	5,854	5,495
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,271	10,691
Current	1,329,796	1,537,644
Total loans	1,340,067	1,548,335	1,413,878
Recorded Investment > 90 Days and Accruing	721	644
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	8,328	7,397
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	186	1,129
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	1,757	2,165
Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112,252	112,209
Current	11,059,502	10,966,140
Total loans	11,171,754	11,078,349	10,521,765
Recorded Investment > 90 Days and Accruing	17,857	11,203
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	23,579	14,651
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	3,088	5,465
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	85,585	92,093
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	90,812	93,703
Current	8,565,514	8,526,898
Total loans	8,656,326	8,620,601	8,336,222
Recorded Investment > 90 Days and Accruing	13,920	10,823
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	19,036	12,257
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	2,527	3,895
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	69,249	77,551
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	21,440	18,506
Current	2,493,988	2,439,242
Total loans	2,515,428	2,457,748	2,185,543
Recorded Investment > 90 Days and Accruing	3,937	380
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	4,543	2,394
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	561	1,570
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	16,336	14,542
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	66,878	70,750
Current	2,866,373	2,839,331
Total loans	2,933,251	2,910,081	2,732,821
Recorded Investment > 90 Days and Accruing	679
Residential Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	39,534	32,869
Residential Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,045	14,706
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,299	23,175
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	29,083	34,762
Current	2,075,289	2,113,105
Total loans	2,104,372	2,147,867	$ 2,029,178
Recorded Investment > 90 Days and Accruing	660	618
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,738	20,402
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,120	4,695
Consumer [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 9,225	$ 9,665

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Total Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 15,075,215	$ 14,968,463
Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	11,171,754	11,078,349
Total Commercial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	14,141,690	13,902,485
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	10,371,654	10,149,799
Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	349,301	440,415
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	257,840	344,781
Total Commercial [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	90,639	105,227
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	78,989	98,901
Total Commercial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	493,585	520,336
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	463,271	484,868
Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,933,251	2,910,081
Residential Mortgages [Member] | Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,893,635	2,873,669
Residential Mortgages [Member] | Nonperforming [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	39,616	36,412
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,104,372	2,147,867
Consumer [Member] | Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,085,456	2,130,395
Consumer [Member] | Nonperforming [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	18,916	17,472
Residential Mortgage and Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	5,037,623	5,057,948
Residential Mortgage and Consumer [Member] | Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,979,091	5,004,064
Residential Mortgage and Consumer [Member] | Nonperforming [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	58,532	53,884
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,656,326	8,620,601
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,028,706	7,875,588
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	166,406	260,510
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	62,830	75,752
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	398,384	408,751
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,515,428	2,457,748
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,342,948	2,274,211
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	91,434	84,271
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	16,159	23,149
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	64,887	76,117
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,563,394	2,341,779
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,450,517	2,265,087
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	81,718	46,535
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	10,760	5,510
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	20,399	24,647
Construction and Land Development [Member] | Total Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,340,067	1,548,335
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,319,519	1,487,599
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	9,743	49,099
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	890	816
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 9,915	$ 10,821

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	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 129,596	$ 153,403
Carrying Amount of Loans, Payments received, net	(8,286)	(39,556)
Carrying Amount of Loans, Accretion	3,584	15,749
Carrying Amount of Loans, Balance at end of period	124,894	129,596
Accretable Yield, Balance at beginning of period	37,294	62,517
Accretable Yield, Payments received, net	(1,100)	(5,779)
Accretable Yield, Accretion	(3,584)	(15,749)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions	(872)	(3,695)
Accretable Yield, Balance at end of period	$ 31,738	$ 37,294

Operating Leases - (Narrative)

Operating Leases - (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Leases [Line Items]
Operating lease, right-of-use asset	$ 113,447	$ 115,900
Operating lease payment obligation	$ 128,494	130,700
Decrease in existing lease incentive and other deferred rent liabilities		$ 14,800
Lessee, operating lease, existence of option to extend [true/false]	false
Lessee, operating lease, option to extend	As these extension options are not generally considered reasonably certain of renewal, they are not included in the lease term.
Minimum [Member]
Leases [Line Items]
Lessee, operating lease, term of contract	5 years
Lessee, operating lease, renewal term	1 year
Maximum [Member]
Leases [Line Items]
Lessee, operating lease, term of contract	20 years
Lessee, operating lease, renewal term	20 years

Operating Leases - Summary of S

Operating Leases - Summary of Supplemental Balance Sheet Information Pertaining To Operating Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities for operating leases	$ 4,007
Right of use assets obtained in exchange for lease liabilities	$ 116,618
Weighted average remaining lease term (in years)	13 years 1 month 13 days
Weighted average discount rate	3.56%

Operating Leases - Summary Matu

Operating Leases - Summary Maturities of Lease Liabilities and Present Value Discount (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2019	$ 12,198
2020	15,421
2021	14,587
2022	14,391
2023	13,109
Thereafter	95,414
Total	165,120
Present value discount	(36,626)
Lease liability	$ 128,494	$ 130,700

Operating Leases - Components o

Operating Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease expense	$ 4,253
Short-term lease expense	19
Variable lease expense	12
Sublease income	(116)
Total	$ 4,168

Securities Sold under Agreeme_2

Securities Sold under Agreements to Repurchase (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Brokers And Dealers [Abstract]
Securities sold under agreements to repurchase	$ 478.3	$ 428.6

Derivatives (Fair Values of Der

Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		$ 3,141,363	$ 3,024,565
Fair Values, Assets		1,726	3,325
Fair Values, Liabilities		4,598	2,160
Less: netting adjustment, Assets	[1],[2]	(13,514)	(11,979)
Less: netting adjustment, Liabilities	[1],[2]	(26,407)	(22,588)
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,363,110	1,358,110
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		1,778,253	1,666,455
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	[3]	1,373,378	1,277,404
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		169,317	171,222
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		82,845	77,208
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		69,931	59,119
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		39,029	37,749
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		43,753	43,753
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	39,341	28,959
Total derivative assets/liabilities	[1]	25,827	16,980
Other Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	9,765	3,954
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	29,576	25,005
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1],[3]	28,570	23,670
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	10	10
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	[1]	21	110
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	[1]	493	464
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Assets	[1]	482	751
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	44,536	44,815
Total derivative assets/liabilities	[1]	18,129	22,227
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	5,859	11,262
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	38,677	33,553
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1],[3]	30,506	24,669
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	162	131
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	[1]	607	664
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	[1]	1	67
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	448	718
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]
Derivatives, Fair Value [Line Items]
Fair Values, Liabilities	[1]	6,953	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		975,000	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	[1]	9,765	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	[1]	4,899	9,173
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount		388,110	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	[1]	$ 960	$ 2,089
[1]	Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.
[2]	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.
[3]	The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)item	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Derivative [Line Items]
Notional amount of derivatives	$ 3,141,363		$ 3,024,565
Fair value liability	6,900		7,300
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	1,363,110		1,358,110
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Notional amount of derivatives	975,000		$ 875,000
Termination fees	10,600
Amortization of accumulated other comprehensive loss on terminated cash flow hedges	$ 1,400	$ 1,000
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	$ 450,000
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	$ 475,000
Derivative maturity expiration year	2022
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	2023
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	2024

Derivatives (Effects of Derivat

Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	$ (2,195)	$ 779
Other Noninterest Income [Member] | All Other Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	809	1,523
Cash Flow Hedge [Member] | Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	(2,016)	(618)
Fair Value Hedging [Member] | Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income reflected in income statement	$ (988)	$ (126)

Derivatives (Offsetting Derivat

Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 17,165	$ 16,167
Gross Amounts Offset in the Statement of Income, Derivative Assets	(15,439)	(12,842)
Net Amounts Presented in the Statement of Income, Derivative Assets	1,726	3,325
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets	1,726	1,846
Net Amounts Presented in the Statement of Income, Derivative Assets		1,479
Gross Amounts Recognized, Derivative Liabilities	30,630	23,811
Gross Amounts Offset in the Statement of Income, Derivative Liabilities	(26,032)	(21,651)
Net Amounts Presented in the Statement of Income, Derivative Liabilities	4,598	2,160
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities	1,726	1,846
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities	6,986	2,871
Net Amounts Presented in the Statement of Income, Derivative Liabilities	$ (4,114)	$ (2,557)

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	May 24, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares	900,000	900,000
Treasury stock, Cost basis	$ 16.6	$ 18.5
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 purchased price per share	$ 41.30
Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares nonvested	1,300,000	1,300,000

Stockholders' Equity (Component

Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (180,709)	$ (134,402)
Net change in unrealized gain or loss	57,243	(62,244)
Reclassification of net loss realized and included in earnings	4,219	1,796
Amortization of unrealized net loss on securities transferred to HTM	591	755
Income tax expense (benefit)	13,853	(13,546)
Ending Balance	(132,509)	(180,549)
Equity Method Investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in unrealized gain or loss	784
Ending Balance	784
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(50,125)	(29,512)
Net change in unrealized gain or loss	46,984	(55,114)
Income tax expense (benefit)	10,623	(12,508)
Ending Balance	(13,764)	(72,118)
Held to Maturity Securities Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(12,044)	(14,585)
Amortization of unrealized net loss on securities transferred to HTM	591	755
Income tax expense (benefit)	134	171
Ending Balance	(11,587)	(14,001)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(110,247)	(79,078)
Reclassification of net loss realized and included in earnings	2,203	1,177
Income tax expense (benefit)	498	267
Ending Balance	(108,542)	(78,168)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(8,293)	(11,227)
Net change in unrealized gain or loss	9,475	(7,130)
Reclassification of net loss realized and included in earnings	2,016	619
Income tax expense (benefit)	2,598	(1,476)
Ending Balance	$ 600	$ (16,262)

Stockholders' Equity (Line Item

Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - Amount Reclassified from Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	$ (3,722)	$ (1,972)
Held to Maturity 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]	(591)	(755)
Tax effect	[1]	134	171
Net of tax	[1]	(457)	(584)
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1],[2]	(2,203)	(1,177)
Tax effect	[1]	498	267
Net of tax	[1]	(1,705)	(910)
Gains and Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of unrealized gain (loss) on cash flow hedges	[1]	(610)	336
Tax effect	[1]	138	(76)
Net of tax	[1]	(472)	260
Amortization of loss on terminated cash flow hedges	[1]	(1,406)	(954)
Tax effect	[1]	318	216
Net of tax	[1]	$ (1,088)	$ (738)
[1]	Amounts in parentheses indicate reduction in net income.
[2]	These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 12 – Retirement Plans for additional details).

Noninterest Income (Components

Noninterest Income (Components of Other Noninterest Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income Disclosure Nonoperating [Abstract]
Income from bank-owned life insurance	$ 3,265	$ 3,070
Credit related fees	2,595	2,722
Income from derivatives	809	1,523
Gain (loss) on sales of assets	397	(1,207)
Other miscellaneous	2,402	3,377
Total other noninterest income	$ 9,468	$ 9,485

Other Noninterest Expense (Deta

Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Expense Disclosure Nonoperating [Abstract]
Advertising	$ 3,080	$ 2,526
Corporate value and franchise taxes	4,042	3,440
Printing and supplies	1,169	1,286
Telecommunications and postage	3,466	3,850
Travel expense	1,098	1,066
Entertainment and contributions	2,708	2,518
Tax credit investment amortization	1,138	874
Other retirement expense	(4,105)	(4,463)
Other miscellaneous	5,691	5,684
Total other noninterest expense	$ 18,287	$ 16,781

Earnings Per Common Share (Comp

Earnings Per Common Share (Computation of Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income to common shareholders	$ 79,164	$ 72,475
Net income allocated to participating securities - basic and diluted	1,337	1,366
Net income allocated to common shareholders - basic and diluted	$ 77,827	$ 71,109
Weighted-average common shares - basic	85,688	85,241
Dilutive potential common shares	112	182
Weighted-average common shares - diluted	85,800	85,423
Earnings per common share: Basic	$ 0.91	$ 0.83
Earnings per common share: Diluted	$ 0.91	$ 0.83

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Weighted-average anti-dilutive potential common shares	1,281	0

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan	$ 100
Newly eligible associates initial savings rate	3.00%
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%
2017 Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributed to pension plan		$ 39
Amended Hancock 401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional matching percentage	2.00%
Period of employment for eligibility	3 years
Amended Hancock 401K Plan [Member] | 4% Of Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	4.00%
Amended Hancock 401K Plan [Member] | 6% Of Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	6.00%
Amended Hancock 401K Plan [Member] | 2% Of Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching percentage	2.00%

Retirement Plans (Components of

Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,775	$ 2,925
Interest cost	4,863	3,923
Expected return on plan assets	(11,300)	(9,700)
Amortization of net loss and prior service costs	2,430	1,326
Net periodic benefit cost (reduction of cost)	(1,232)	(1,526)
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	29	35
Interest cost	128	137
Amortization of net loss and prior service costs	(227)	(149)
Net periodic benefit cost (reduction of cost)	$ (70)	$ 23

Share-Based Payment Arrangeme_3

Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning	46,865,000
Number of Shares, Exercised/Released	0
Number of Shares, Outstanding at Ending	46,865,000	46,865,000
Number of Shares, Exercisable at Ending	46,865,000
Weighted Average Exercise Price, Outstanding at Beginning	$ 31.88
Weighted Average Exercise Price, Outstanding at Ending	31.88	$ 31.88
Weighted Average Exercise Price, Exercisable at Ending	$ 31.88
Weighted Average Remaining Contractual Term (Years)	2 years 3 months 18 days	2 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding at Beginning	$ 164
Aggregate Intrinsic Value, Outstanding at Ending	399	$ 164
Aggregate Intrinsic Value, Exercisable at Ending	$ 399

Share-Based Payment Arrangeme_4

Share-Based Payment Arrangements (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)entity$ / sharesshares	Mar. 31, 2018USD ($)
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercises of stock options	0
Intrinsic value of options exercised | $		$ 0.5
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 51
Weighted-average period	3 years 3 months 18 days
Total fair value of shares vested | $	$ 0.1	$ 0.3
Shares granted	72,081,000
Grant date fair value per share | $ / shares	$ 34.20
Performance Shares [Member] | Executive Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	3 years
Performance Shares [Member] | Total Shareholder Return [Member] | Executive Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	33,691
Grant date fair value per share | $ / shares	$ 35.27
Vesting performance period	3 years
Number of peer group regional banks | entity	42
Percentage of maximum number of shares vested	200.00%
Performance Shares [Member] | Core Earnings Per Share [Member] | Executive Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	33,691
Grant date fair value per share | $ / shares	$ 32.15
Vesting performance period	2 years

Share-Based Payment Arrangeme_5

Share-Based Payment Arrangements (Summary of Nonvested Restricted and Performance Shares) (Details) - Restricted and Performance Shares [Member]	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Nonvested at Beginning | shares	1,494,041,000
Number of Shares, Granted | shares	72,081,000
Number of Shares, Vested | shares	(8,028,000)
Number of Shares, Forfeited | shares	(20,499,000)
Number of Shares, Nonvested at Ending | shares	1,537,595,000
Weighted Average Grant Date Fair Value, Nonvested at Beginning | $ / shares	$ 39.89
Weighted Average Grant Date Fair Value, Granted | $ / shares	34.20
Weighted Average Grant Date Fair Value, Vested | $ / shares	47.17
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	38.92
Weighted Average Grant Date Fair Value, Nonvested at Ending | $ / shares	$ 39.60

Commitments and Contingencies_2

Commitments and Contingencies (Off-Balance Sheet Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Contract amounts	$ 7,198,032	$ 7,234,528
Letters of Credit [Member]
Loss Contingencies [Line Items]
Contract amounts	$ 336,419	$ 365,498

Fair Value Measurements (Financ

Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		$ 2,681,080	$ 2,691,037
Derivative assets		1,726	3,325
Derivative liabilities		4,598	2,160
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,681,080	2,691,037
Derivative assets	[1]	25,827	16,980
Total recurring fair value measurements - assets		2,706,907	2,708,017
Derivative liabilities	[1]	18,129	22,227
Total recurring fair value measurements - liabilities		18,129	22,227
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		2,681,080	2,691,037
Derivative assets	[1]	25,827	16,980
Total recurring fair value measurements - assets		2,706,907	2,708,017
Derivative liabilities	[1]	11,176	14,923
Total recurring fair value measurements - liabilities		11,176	14,923
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	[1]	6,953	7,304
Total recurring fair value measurements - liabilities		6,953	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		72,143	71,706
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		72,143	71,706
Recurring [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		245,940	240,427
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		245,940	240,427
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		1,413,032	1,443,402
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		1,413,032	1,443,402
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		787,834	770,077
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		787,834	770,077
Recurring [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities		158,631	161,925
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		$ 158,631	$ 161,925
[1]	For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - Recurring [Member]	3 Months Ended
	Mar. 31, 2019USD ($)shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfers of assets and liabilities between levels | $	$ 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 6 months

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Level 3 Fair Value Rollforward) (Details) - Level 3 [Member] - Recurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liability beginning balance	$ 7,304
Entry into derivative contract	63	$ 7,304
Cash settlement	(414)
Liability ending balance	$ 6,953	$ 7,304

Fair Value Measurements (Overvi

Fair Value Measurements (Overview of the Valuation Techniques and Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		$ 4,598	$ 2,160
Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	18,129	22,227
Recurring [Member] | Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	$ 6,953	7,304
Recurring [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		24 months
Recurring [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		48 months
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		$ 6,953	$ 7,304
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.62%
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.59%
Recurring [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		6.00%
Recurring [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		18.00%
[1]	For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.

Fair Value Measurements (Fina_2

Fair Value Measurements (Financial Assets Measured at Fair Value on Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 163,781	$ 170,918
Other real estate owned and foreclosed assets, net	7,688	14,594
Total nonrecurring fair value measurements	171,469	185,512
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	163,781	170,918
Total nonrecurring fair value measurements	163,781	170,918
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and foreclosed assets, net	7,688	14,594
Total nonrecurring fair value measurements	$ 7,688	$ 14,594

Fair Value Measurements (Estima

Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available for sale securities	$ 2,681,080	$ 2,691,037
Held to maturity securities	2,896,442	2,979,547
Derivative financial instruments	1,726	3,325
Derivative financial instruments	4,598	2,160
Total Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	523,956	494,466
Available for sale securities	2,681,080	2,691,037
Held to maturity securities	2,892,910	2,935,856
Loans, net	19,809,851	19,726,887
Loans held for sale	27,437	28,150
Derivative financial instruments	25,827	16,980
Deposits	23,351,829	23,129,574
Federal funds purchased	450	425
Securities sold under agreements to repurchase	478,285	428,599
FHLB short-term borrowings	910,000	1,160,104
Long-term debt	227,206	223,135
Derivative financial instruments	18,129	22,227
Total Fair Value [Member] | Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	523,956	494,466
Federal funds purchased	450	425
Securities sold under agreements to repurchase	478,285	428,599
FHLB short-term borrowings	910,000	1,160,104
Total Fair Value [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available for sale securities	2,681,080	2,691,037
Held to maturity securities	2,892,910	2,935,856
Loans, net	163,781	170,918
Loans held for sale	27,437	28,150
Derivative financial instruments	25,827	16,980
Long-term debt	227,206	223,135
Derivative financial instruments	11,176	14,923
Total Fair Value [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans, net	19,646,070	19,555,969
Deposits	23,351,829	23,129,574
Derivative financial instruments	6,953	7,304
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	523,956	494,466
Available for sale securities	2,681,080	2,691,037
Held to maturity securities	2,896,442	2,979,547
Loans, net	19,918,150	19,831,897
Loans held for sale	27,437	28,150
Derivative financial instruments	25,827	16,980
Deposits	23,380,294	23,150,185
Federal funds purchased	450	425
Securities sold under agreements to repurchase	478,285	428,599
FHLB short-term borrowings	910,000	1,160,104
Long-term debt	224,962	224,993
Derivative financial instruments	$ 18,129	$ 22,227

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Recent Accounting Pronouncements [Line Items]
Operating lease, right-of-use asset	$ 113,447	$ 115,900
Operating lease payment obligation	$ 128,494	130,700
Accounting Standards Update 2016-02 [Member]
Recent Accounting Pronouncements [Line Items]
Operating lease, right-of-use asset		116,000
Operating lease payment obligation		131,000
Deferred rent liabilities		$ 15,000

Subsequent Event (Details)

Subsequent Event (Details) - MidSouth [Member] $ in Millions	Apr. 30, 2019USD ($)	Mar. 31, 2019USD ($)
Subsequent Event [Line Items]
Assets		$ 1,700
Loans		900
Deposits		$ 1,400
Subsequent Event [Member]
Subsequent Event [Line Items]
Fixed conversion ratio	0.2952
Business combination transaction value on an average of share price	$ 213