Fulton Financial (FULT) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document and Entity Information
Entity Registrant Name	FULTON FINANCIAL CORP
Entity Central Index Key	700,564
Trading Symbol	fult
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		175,754,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 100,151	$ 108,291
Interest-bearing deposits with other banks	210,906	293,805
Federal Reserve Bank and Federal Home Loan Bank stock	56,900	60,761
Loans held for sale	23,450	31,530
Available for sale investment securities	2,592,823	2,547,956
Loans, net of unearned income	15,696,284	15,768,247
Less: Allowance for loan losses	(163,217)	(169,910)
Net Loans	15,533,067	15,598,337
Premises and equipment	230,313	222,802
Accrued interest receivable	53,060	52,910
Goodwill and intangible assets	531,556	531,556
Other assets	616,715	588,957
Total Assets	19,948,941	20,036,905
LIABILITIES
Noninterest-bearing	4,291,821	4,437,294
Interest-bearing	11,185,282	11,360,238
Total Deposits	15,477,103	15,797,532
Short-term borrowings:
Federal funds purchased	395,000	220,000
Other short-term borrowings	542,852	397,524
Total Short-Term Borrowings	937,852	617,524
Accrued interest payable	9,681	9,317
Other liabilities	350,313	344,329
Federal Home Loan Bank advances and other long-term debt	938,499	1,038,346
Total Liabilities	17,713,448	17,807,048
SHAREHOLDERS’ EQUITY
Common stock, $2.50 par value, 600 million shares authorized, 221.1 million shares issued in 2018 and 220.9 million shares issued in 2017	552,682	552,232
Additional paid-in capital	1,481,545	1,478,389
Retained earnings	857,153	821,619
Accumulated other comprehensive loss	(67,172)	(32,974)
Treasury stock, at cost, 45.7 million shares in 2018 and 2017	(588,715)	(589,409)
Total Shareholders’ Equity	2,235,493	2,229,857
Total Liabilities and Shareholders’ Equity	$ 19,948,941	$ 20,036,905

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 2.5	$ 2.5
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	221,100,000	220,900,000
Treasury stock, shares (in shares)	45,700,000	45,700,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Loans, including fees	$ 160,136	$ 142,566
Investment securities:
Taxable	13,193	11,914
Tax-exempt	2,965	2,849
Dividends	5	129
Loans held for sale	216	187
Other interest income	1,172	842
Total Interest Income	177,687	158,487
INTEREST EXPENSE
Deposits	16,450	11,801
Short-term borrowings	2,041	855
Federal Home Loan Bank advances and other long-term debt	7,878	8,252
Total Interest Expense	26,369	20,908
Net Interest Income	151,318	137,579
Provision for credit losses	3,970	4,800
Net Interest Income After Provision for Credit Losses	147,348	132,779
NON-INTEREST INCOME
Other service charges and fees	11,419	12,437
Service charges on deposit accounts	11,962	12,400
Investment management and trust services	12,871	11,808
Mortgage banking income	4,193	4,596
Investment securities gains, net	19	1,106
Other	5,411	4,326
Non-interest income before investment securities gains	45,856	45,567
Total Non-Interest Income	45,875	46,673
NON-INTEREST EXPENSE
Salaries and employee benefits	75,768	69,236
Net occupancy expense	13,632	12,663
Data processing and software	10,473	8,979
Other outside services	8,124	5,546
Amortization of tax credit investments	1,637	998
Professional fees	4,816	2,737
Equipment expense	3,534	3,359
FDIC insurance expense	2,953	2,058
Taxes, Other	2,302	2,087
Marketing	2,250	1,986
Other	11,172	12,626
Total Non-Interest Expense	136,661	122,275
Income Before Income Taxes	56,562	57,177
Income taxes	7,082	13,797
Net Income	$ 49,480	$ 43,380
PER SHARE:
Net Income (Basic) (in dollars per share)	$ 0.28	$ 0.25
Net Income (Diluted) (in dollars per share)	0.28	0.25
Cash Dividends (in dollars per share)	$ 0.12	$ 0.11

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 49,480	$ 43,380
Other Comprehensive (Loss) Income, net of tax:
Unrealized (loss) gain on securities	(27,644)	4,273
Reclassification adjustment for securities gains included in net income	(16)	(719)
Non-credit related unrealized gain on other-than-temporarily impaired debt securities	(224)	0
Amortization of net unrecognized pension and postretirement items	339	343
Other Comprehensive (Loss) Income	(27,097)	3,897
Total Comprehensive Income	$ 22,383	$ 47,277

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Total	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2016		$ 2,121,115	$ 549,707	$ 1,467,602	$ 732,099	$ (38,449)	$ (589,844)
Beginning Balance (in shares) at Dec. 31, 2016			174,040
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		43,380			43,380
Other comprehensive loss		3,897				3,897
Stock issued		4,731	$ 585	3,265			881
Stock issued, including related tax benefits (in shares)			303
Stock-based compensation awards		734		734
Common stock cash dividends		(19,174)			(19,174)
Ending Balance at Mar. 31, 2017		2,154,683	$ 550,292	1,471,601	756,305	(34,552)	(588,963)
Ending Balance (in shares) at Mar. 31, 2017			174,343
Beginning Balance at Dec. 31, 2017		2,229,857	$ 552,232	1,478,389	821,619	(32,974)	(589,409)
Beginning Balance (in shares) at Dec. 31, 2017			175,170
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		49,480			49,480
Other comprehensive loss		(27,097)				(27,097)
Stock issued		2,790	$ 450	1,646			694
Stock issued, including related tax benefits (in shares)			234
Stock-based compensation awards		1,510		1,510
Reclassification of stranded tax effects	[1]	0			7,101	(7,101)
Common stock cash dividends		(21,047)			(21,047)
Ending Balance at Mar. 31, 2018		$ 2,235,493	$ 552,682	$ 1,481,545	$ 857,153	$ (67,172)	$ (588,715)
Ending Balance (in shares) at Mar. 31, 2018			175,404
[1]	Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends per share	$ 0.12	$ 0.11

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 49,480	$ 43,380
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	3,970	4,800
Depreciation and amortization of premises and equipment	7,329	7,032
Amortization of tax credit investments	8,364	9,128
Net amortization of investment securities premiums	2,517	2,416
Investment securities gains, net	(19)	(1,106)
Gain on sales of mortgage loans held for sale	(2,645)	(3,074)
Proceeds from sales of mortgage loans held for sale	170,693	115,417
Originations of mortgage loans held for sale	(159,968)	(108,429)
Amortization of issuance costs on long-term debt	194	168
Stock-based compensation	1,510	734
Increase in accrued interest receivable	(150)	(61)
Increase in other assets	(6,923)	(4,514)
Increase in accrued interest payable	364	2,874
(Decrease) increase in other liabilities	(2,890)	1,039
Total adjustments	22,346	26,424
Net cash provided by operating activities	71,826	69,804
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	1,444	8,735
Proceeds from principal repayments and maturities of securities available for sale	78,150	98,024
Purchase of securities available for sale	(161,944)	(49,430)
Decrease (increase) in short-term investments	86,760	(59,135)
Net decrease (increase) in loans	67,928	(267,383)
Net change in tax credit investments	(14,840)	(5,397)
Net change in tax credit investments	20,783	5,283
Net cash provided by (used in) investing activities	36,715	(279,869)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in demand and savings deposits	(278,626)	112,348
Net decrease in time deposits	(41,803)	(34,868)
Increase (decrease) in short-term borrowings	320,328	(88,000)
Additions to long-term debt	0	223,375
Repayments of long-term debt	(100,041)	(15,037)
Net proceeds from issuance of common stock	2,790	4,731
Dividends paid	(19,329)	(17,403)
Net cash (used in) provided by financing activities	(116,681)	185,146
Net Decrease in Cash and Due From Banks	(8,140)	(24,919)
Cash and Due From Banks at Beginning of Period	108,291	118,763
Cash and Due From Banks at End of Period	100,151	93,844
Cash paid during the period for:
Interest	26,005	18,034
Income taxes	$ 154	$ 116

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of Fulton Financial Corporation (the "Corporation") have been prepared in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as revenues and expenses during the period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017 . Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the Securities and Exchange Commission ("SEC"). Recently Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") Update 2014-09, "Revenue from Contracts with Customers." This standards update established a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle prescribed by this standards update is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard applies to all contracts with customers, except those that are within the scope of other topics in the FASB ASC. The Corporation adopted this standard, and all subsequent Accounting Standards Updates ("ASU") that modified it on January 1, 2018 under the modified retrospective approach with no material impact on its consolidated financial statements. The Corporation evaluated the impact of the adoption of ASC Update 2014-09 on its consolidated financial statements and did not identify any significant changes in the timing of revenue recognition as a result of this amended guidance. The sources of revenue for the Corporation are interest income from loans and investments, net of interest expense on deposits and borrowings, and non-interest income. Non-interest income is earned from various banking and financial services that the Corporation offers through its subsidiary banks. Revenue is recognized as earned based on contractual terms, as transactions occur, or as services are provided. Following is further detail of the various types of revenue the Corporation earns and when it is recognized. Interest income : Interest income is recognized on an accrual basis according to loan agreements, securities contracts or other such written contracts and is outside the scope of ASC Update 2014-09. Investment management and trust services: Consists of trust commission income, brokerage income, money market income and insurance commission income. Trust commission income consists of advisory fees that are based on market values of clients' managed portfolios and transaction fees for fiduciary services performed, both of which are recognized as earned. Brokerage income includes advisory fees which are recognized as earned on a monthly basis and transaction fees that are recognized when transactions occur. Money market income is based on the balances held in trust accounts and is recognized monthly. Insurance commission income is earned and recognized when policies are originated. Currently, no investment management and trust service income is based on performance or investment results. Service charges on deposit accounts: Consists of cash management, overdraft, non-sufficient fund fees and other service charges on deposit accounts. Revenue is primarily transactional and recognized when earned, at the time the transactions occur. Other service charges and fees: Consists of branch fees, automated teller machine fees, debit card income and merchant services fees. These fees are primarily transactional, and revenue is recognized when transactions occur. Also included in other service charges and fees are letter of credit fees, foreign exchange income and commercial loan interest rate swap fees, which are outside the scope of ASC Update 2014-09. Mortgage banking income: Consists of gains or losses on the sale of residential mortgage loans and mortgage loan servicing income. These revenues are outside the scope of ASC Update 2014-09. Other Income: Includes credit card income, gains on sales of Small Business Association ("SBA") loans, cash surrender value of life insurance, and other miscellaneous income. These items are either outside the scope of ASC Update 2014-09 or are immaterial. In January 2016, the FASB issued ASC Update 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities." ASC Update 2016-01 provides guidance regarding the income statement impact of equity investments held by an entity and the recognition of changes in fair value of financial liabilities when the fair value option is elected. This standard requires equity investments to be measured at fair value, with changes recorded in net income. This ASU also requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes. ASC Update 2016-01 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-01 did not have a material impact on its consolidated financial statements. In August 2016, the FASB issued ASC Update 2016-15, "Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments." This standards update provides guidance regarding the presentation of certain cash receipts and cash payments in the statement of cash flows, addressing eight specific cash flow classification issues, in order to reduce existing diversity in practice. ASC Update 2016-15 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-15 did not have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASC Update 2016-18, "Statement of Cash Flows - Restricted Cash." This standards update provides guidance regarding the presentation of restricted cash in the statement of cash flows. The update requires companies to include amounts generally described as restricted cash and restricted cash equivalents, along with cash and cash equivalents, when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. It also requires an entity to disclose the nature of the restrictions on cash and cash equivalents. ASC Update 2016-18 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-18 did not have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASC Update 2017-07, "Improving the Presentation of Net Periodic Pension Costs and Net Periodic Benefit Cost." This standards update requires a company to present service cost separately from the other components of net benefit cost. In addition, the update provides explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. ASC Update 2017-07 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2017-07 did not have a material impact on its consolidated financial statements. In February 2018, the FASB issued ASC Update 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." This ASU permits a reclassification from accumulated other comprehensive income ("AOCI") to retained earnings of the stranded tax effects resulting from the application of the Tax Cuts and Jobs Act of 2017 ("Tax Act"), which changed the corporate tax rate from 35% to 21%. This ASU is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Corporation adopted this standards update effective January 1, 2018 and elected to reclassify $7.1 million of stranded tax effects from AOCI to retained earnings at the beginning of the period of adoption. The Corporation's policy for releasing income tax effects from accumulated other comprehensive income is to release them as investments are sold or mature and pension and post-retirement liabilities are extinguished. Recently Issued Accounting Standards In February 2016, the FASB issued ASC Update 2016-02, "Leases." This standards update states that a lessee should recognize the assets and liabilities that arise from all leases with a term greater than 12 months. The core principle requires the lessee to recognize a liability to make lease payments and a "right-of-use" asset. The accounting applied by the lessor is relatively unchanged. The standards update also requires expanded qualitative and quantitative disclosures. The FASB has also issued amendments to this standard (ASC Updates 2017-13, 2018-01). ASC Update 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2019 quarterly report on Form 10-Q. The Corporation is currently evaluating the impact of the adoption of ASC Update 2016-02 on its consolidated financial statements. The Corporation currently operates a number of branches that are leased, with the leases accounted for as operating leases that are not recognized on the consolidated balance sheet. Under ASC Update 2016-02, right-of-use assets and lease liabilities will need to be recognized on the consolidated balance sheet for these branches, which will also have an impact on regulatory capital ratios. The recognition of operating leases on the Corporation's consolidated balance sheet is expected to be the most significant impact of the adoption of this standards update. In June 2016, the FASB issued ASC Update 2016-13, "Financial Instruments - Credit Losses." The new impairment model prescribed by this standards update is a single impairment model for all financial assets (i.e., loans and held to maturity investments). The recognition of credit losses would be based on an entity’s current estimate of expected losses (referred to as the Current Expected Credit Loss model, or "CECL"), as opposed to recognition of losses only when they are probable under current U.S. GAAP. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. ASC Update 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2020 quarterly report on Form 10-Q. The Corporation is currently evaluating the impact of the adoption of ASC Update 2016-13 on its consolidated financial statements and disclosures. While the Corporation is currently unable to reasonably estimate the impact of adopting ASU 2016-13, it expects that the impact of adoption could be significantly influenced by the composition, characteristics and quality of its loan portfolio as well as the prevailing economic conditions and forecasts as of the adoption date. As part of the evaluation process, the Corporation has established a steering committee and working group that includes individuals from various functional areas to assess processes, portfolio segmentation, systems requirements and needed resources to implement this new accounting standard. In January 2017, the FASB issued ASC Update 2017-04, "Intangibles - Goodwill and Other." This standards update eliminates Step 2 of the goodwill impairment test which measures the impairment amount. Identifying and measuring impairment will take place in a single quantitative step. In addition, no separate qualitative assessment for reporting units with zero or negative carrying amount is required. Entities must disclose the existence of these reporting units and the amount of goodwill allocated to them. This update should be applied on a prospective basis, and an entity is required to disclose the nature of and reason for the change in accounting principle upon transition. ASC Update 2017-04 is effective for annual or interim goodwill impairment tests in reporting periods beginning after December 15, 2019. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its 2020 goodwill impairment test and does not expect the adoption of ASC Update 2017-04 to have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASC Update 2017-08, "Premium Amortization on Purchased Callable Debt Securities." This standards update requires that a company amortize the premium on callable debt securities to the earliest call date versus current U.S. GAAP which requires amortization over the contractual life of the securities. The amortization period for callable debt securities purchased at a discount would not be impacted by the new accounting standards update. This amendment is to be adopted on a modified retrospective basis with a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. ASC Update 2017-08 is effective for annual or interim reporting periods beginning after December 15, 2018. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2019 quarterly report on Form 10-Q and does not expect the adoption of ASC Update 2017-08 to have a material impact on its consolidated financial statements. Reclassifications Certain amounts in the 2017 consolidated financial statements and notes have been reclassified to conform to the 2018 presentation. On the Consolidated Statements of Cash Flows, the net change in tax credit investments is presented as cash flows from investing activities. Prior to the quarter ended March 31, 2018, these cash flows were presented as cash flows from operating activities, included in the net increase (decrease) in other liabilities. The presentation of the cash flows for the quarter ended March 31, 2017 were changed to conform to this presentation, resulting in a $5.3 million decrease in net cash flows used in investing activities and a corresponding increase in net cash flows provided by operating activities. The change had no impact on net income or retained earnings. In addition, the Corporation will revise the Consolidated Statements of Cash Flows for each of the comparative 2017 periods in future filings.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share Basic net income per share is calculated as net income divided by the weighted average number of shares outstanding. Diluted net income per share is calculated as net income divided by the weighted average number of shares outstanding plus the incremental number of shares added as a result of converting common stock equivalents, calculated using the treasury stock method. The Corporation’s common stock equivalents consist of outstanding stock options, restricted stock units ("RSUs") and performance-based restricted stock units ("PSUs"). PSUs are required to be included in weighted average shares outstanding if performance measures, as defined in each PSU award agreement, are met as of the end of the period. A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows: Three months ended March 31 2018 2017 (in thousands) Weighted average shares outstanding (basic) 175,303 174,150 Impact of common stock equivalents 1,265 1,427 Weighted average shares outstanding (diluted) 176,568 175,577

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents changes in other comprehensive income (loss): Before-Tax Amount Tax Effect Net of Tax Amount (in thousands) Three months ended March 31, 2018 Unrealized loss on securities $ (34,991 ) $ 7,347 $ (27,644 ) Reclassification adjustment for securities gains included in net income (1) (19 ) 3 (16 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 285 (61 ) 224 Amortization of net unrecognized pension and postretirement items (2) 430 (91 ) 339 Total Other Comprehensive Loss $ (34,295 ) $ 7,198 $ (27,097 ) Three months ended March 31, 2017 Unrealized gain on securities $ 6,575 $ (2,302 ) $ 4,273 Reclassification adjustment for securities gains included in net income (1) (1,106 ) 387 (719 ) Amortization of net unrecognized pension and postretirement items (2) 528 (185 ) 343 Total Other Comprehensive Income $ 5,997 $ (2,100 ) $ 3,897 (1) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See Note 4, "Investment Securities," for additional details. (2) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See Note 8, "Employee Benefit Plans," for additional details. The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax: Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended March 31, 2018 Balance at December 31, 2017 $ (18,509 ) $ 458 $ (14,923 ) $ (32,974 ) Other comprehensive loss before reclassifications (27,644 ) 224 — (27,420 ) Amounts reclassified from accumulated other comprehensive income (loss) (16 ) — 339 323 Reclassification of stranded tax effects (3,887 ) — (3,214 ) (7,101 ) Balance at March 31, 2018 $ (50,056 ) $ 682 $ (17,798 ) $ (67,172 ) Three months ended March 31, 2017 Balance at December 31, 2016 $ (23,047 ) $ 273 $ (15,675 ) $ (38,449 ) Other comprehensive income before reclassifications 4,273 — — 4,273 Amounts reclassified from accumulated other comprehensive income (loss) (719 ) — 343 (376 ) Balance at March 31, 2017 $ (19,493 ) $ 273 $ (15,332 ) $ (34,552 )

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following table presents the amortized cost and estimated fair values of investment securities, which were all classified as available for sale: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (in thousands) March 31, 2018 U.S. Government sponsored agency securities $ 21,105 $ 40 $ (183 ) $ 20,962 State and municipal securities 413,632 2,247 (9,780 ) 406,099 Corporate debt securities 101,367 2,482 (1,894 ) 101,955 Collateralized mortgage obligations 695,840 236 (16,376 ) 679,700 Residential mortgage-backed securities 1,084,582 3,006 (33,422 ) 1,054,166 Commercial mortgage-backed securities 231,378 15 (4,501 ) 226,892 Auction rate securities 107,410 — (4,361 ) 103,049 Total $ 2,655,314 $ 8,026 $ (70,517 ) $ 2,592,823 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (in thousands) December 31, 2017 U.S. Government sponsored agency securities $ 5,962 $ 2 $ (26 ) $ 5,938 State and municipal securities 405,860 5,638 (2,549 ) 408,949 Corporate debt securities 96,353 2,832 (1,876 ) 97,309 Collateralized mortgage obligations 611,927 491 (9,795 ) 602,623 Residential mortgage-backed securities 1,132,080 3,957 (15,241 ) 1,120,796 Commercial mortgage-backed securities 215,351 — (2,596 ) 212,755 Auction rate securities 107,410 — (8,742 ) 98,668 Total debt securities 2,574,943 12,920 (40,825 ) 2,547,038 Equity securities 776 142 — 918 Total $ 2,575,719 $ 13,062 $ (40,825 ) $ 2,547,956 Securities carried at $1.8 billion at March 31, 2018 and December 31, 2017 , were pledged as collateral to secure public and trust deposits and customer repurchase agreements. The amortized cost and estimated fair values of debt securities as of March 31, 2018 , by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties. Amortized Estimated (in thousands) Due in one year or less $ 14,055 $ 14,063 Due from one year to five years 36,871 36,986 Due from five years to ten years 119,069 119,529 Due after ten years 473,519 461,487 643,514 632,065 Residential mortgage-backed securities (1) 1,084,582 1,054,166 Commercial mortgage-backed securities (1) 231,378 226,892 Collateralized mortgage obligations (1) 695,840 679,700 Total $ 2,655,314 $ 2,592,823 (1) Maturities for mortgage-backed securities and collateralized mortgage obligations are dependent upon the interest rate environment and prepayments on the underlying loans. The following table presents information related to the gross realized gains on the sales of equity and debt securities: Gross Three months ended March 31, 2018 (in thousands) Equity securities $ 9 Debt securities 10 Total $ 19 Three months ended March 31, 2017 Equity securities $ 1,045 Debt securities 61 Total $ 1,106 The cumulative balance of credit-related other-than-temporary impairment charges, previously recognized as components of earnings, for debt securities held by the Corporation at March 31, 2018 and March 31, 2017 was $ 11.5 million . There were no other-than-temporary impairment charges recognized for the three months ended March 31, 2018 and March 31, 2017. The following table presents the gross unrealized losses and estimated fair values of investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2018 and December 31, 2017: Less than 12 months 12 months or longer Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses March 31, 2018 (in thousands) U.S. Government sponsored agency securities $ 12,499 $ (183 ) $ — $ — $ 12,499 $ (183 ) State and municipal securities 163,345 (3,132 ) 114,024 (6,648 ) 277,369 (9,780 ) Corporate debt securities 9,466 (130 ) 28,219 (1,764 ) 37,685 (1,894 ) Collateralized mortgage obligations 456,200 (7,184 ) 176,076 (9,192 ) 632,276 (16,376 ) Residential mortgage-backed securities 527,502 (13,611 ) 471,703 (19,811 ) 999,205 (33,422 ) Commercial mortgage-backed securities 196,887 (3,884 ) 21,539 (617 ) 218,426 (4,501 ) Auction rate securities — — 103,049 (4,361 ) 103,049 (4,361 ) Total $ 1,365,899 $ (28,124 ) $ 914,610 $ (42,393 ) $ 2,280,509 $ (70,517 ) Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized December 31, 2017 (in thousands) U.S. Government sponsored agency securities $ 5,830 $ (26 ) $ — $ — $ 5,830 $ (26 ) State and municipal securities 11,650 (50 ) 118,297 (2,499 ) 129,947 (2,549 ) Corporate debt securities 4,544 (48 ) 32,163 (1,828 ) 36,707 (1,876 ) Collateralized mortgage obligations 303,932 (2,408 ) 187,690 (7,387 ) 491,622 (9,795 ) Residential mortgage-backed securities 511,378 (4,348 ) 500,375 (10,893 ) 1,011,753 (15,241 ) Commercial mortgage-backed securities 190,985 (2,118 ) 21,770 (478 ) 212,755 (2,596 ) Auction rate securities — — 98,668 (8,742 ) 98,668 (8,742 ) Total $ 1,028,319 $ (8,998 ) $ 958,963 $ (31,827 ) $ 1,987,282 $ (40,825 ) The Corporation’s collateralized mortgage obligations and mortgage-backed securities have contractual terms that generally do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. The change in fair value of these securities is attributable to changes in interest rates and not credit quality, and the Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost. Therefore, the Corporation does not consider these investments to be other-than-temporarily impaired as of March 31, 2018 . As of March 31, 2018 , all of the auction rate securities (auction rate certificates, or "ARCs"), were rated above investment grade. Based on management’s evaluations, none of the ARCs were subject to any other-than-temporary impairment charges for the three months ended March 31, 2018 . The Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost, which may be at maturity. The majority of the Corporation's available for sale corporate debt securities are issued by financial institutions. The following table presents the amortized cost and estimated fair values of corporate debt securities: March 31, 2018 December 31, 2017 Amortized cost Estimated fair value Amortized cost Estimated fair value (in thousands) Single-issuer trust preferred securities $ 31,352 $ 30,513 $ 31,335 $ 30,703 Subordinated debt 54,011 54,357 49,013 49,533 Senior debt 12,029 12,245 12,031 12,392 Pooled trust preferred securities — 865 — 707 Corporate debt securities issued by financial institutions 97,392 97,980 92,379 93,335 Other corporate debt securities 3,975 3,975 3,974 3,974 Available for sale corporate debt securities $ 101,367 $ 101,955 $ 96,353 $ 97,309 Single-issuer trust preferred securities had an unrealized loss of $839,000 at March 31, 2018 . Four of the 17 single-issuer trust preferred securities, with an amortized cost of $4.9 million and an estimated fair value of $4.7 million at March 31, 2018 , were rated below investment grade by at least one ratings agency. All of the single-issuer trust preferred securities rated below investment grade were rated either "BB" or "Ba". Two single-issuer trust preferred securities with an amortized cost of $3.8 million and an estimated fair value of $3.1 million at March 31, 2018 were not rated by any ratings agency. Based on management’s evaluations, no corporate debt securities were subject to any other-than-temporary impairment charges for the three months ended March 31, 2018 . The Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost, which may be at maturity.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans and Allowance for Credit Losses	Loans and Allowance for Credit Losses Loans, Net of Unearned Income Loans, net of unearned income are summarized as follows: March 31, December 31, 2017 (in thousands) Real-estate - commercial mortgage $ 6,332,508 $ 6,364,804 Commercial - industrial, financial and agricultural 4,299,072 4,300,297 Real-estate - residential mortgage 1,976,524 1,954,711 Real-estate - home equity 1,514,241 1,559,719 Real-estate - construction 976,131 1,006,935 Consumer 326,766 313,783 Leasing and other 297,465 291,556 Overdrafts 2,031 4,113 Loans, gross of unearned income 15,724,738 15,795,918 Unearned income (28,454 ) (27,671 ) Loans, net of unearned income $ 15,696,284 $ 15,768,247 The Corporation segments its loan portfolio by general loan type, or "portfolio segments," as presented in the table under the heading, "Loans, Net of Unearned Income," above. Certain portfolio segments are further disaggregated and evaluated collectively for impairment based on "class segments," which are largely based on the type of collateral underlying each loan. Commercial loans include both secured and unsecured loans. Construction loan class segments include loans secured by commercial real estate, loans to commercial borrowers secured by residential real estate and loans to individuals secured by residential real estate. Consumer loan class segments include direct consumer installment loans and indirect vehicle loans. Allowance for Credit Losses The allowance for credit losses consists of the allowance for loan losses and the reserve for unfunded lending commitments. The allowance for loan losses represents management’s estimate of incurred losses in the loan portfolio as of the balance sheet date and is recorded as a reduction to loans. The reserve for unfunded lending commitments represents management’s estimate of incurred losses in its unfunded loan commitments and is recorded in other liabilities on the consolidated balance sheets. The allowance for credit losses is increased by charges to expense, through the provision for credit losses, and decreased by charge-offs, net of recoveries. The Corporation’s allowance for credit losses includes: (1) specific allowances allocated to loans individually evaluated for impairment (FASB ASC Section 310-10-35); and (2) allowances calculated for pools of loans collectively evaluated for impairment (FASB ASC Subtopic 450-20). The following table presents the components of the allowance for credit losses: March 31, December 31, (in thousands) Allowance for loan losses $ 163,217 $ 169,910 Reserve for unfunded lending commitments 12,802 6,174 Allowance for credit losses $ 176,019 $ 176,084 The following table presents the activity in the allowance for credit losses: Three months ended March 31 2018 2017 (in thousands) Balance at beginning of period $ 176,084 $ 171,325 Loans charged off (6,397 ) (9,407 ) Recoveries of loans previously charged off 2,362 5,929 Net loans charged off (4,035 ) (3,478 ) Provision for credit losses 3,970 4,800 Balance at end of period $ 176,019 $ 172,647 The Corporation has historically maintained an unallocated allowance for credit losses for factors and conditions that exist at the balance sheet date, but are not specifically identifiable, and to recognize the inherent imprecision in estimating and measuring loss exposure. In the second quarter of 2017, enhancements were made to allow for the impact of these factors and conditions to be quantified in the allowance allocation process. Accordingly, an unallocated allowance for credit losses is no longer necessary. The following table presents the activity in the allowance for loan losses by portfolio segment: Real Estate - Commercial Mortgage Commercial - Industrial, Financial and Agricultural Real Estate - Home Equity Real Estate - Residential Mortgage Real Estate - Construction Consumer Leasing, other and overdrafts Unallocated Total (in thousands) Three months ended March 31, 2018 Balance at December 31, 2017 $ 58,793 $ 66,280 $ 18,127 $ 16,088 $ 6,620 $ 2,045 $ 1,957 $ — $ 169,910 Loans charged off (267 ) (4,005 ) (408 ) (162 ) (158 ) (892 ) (505 ) — (6,397 ) Recoveries of loans previously charged off 279 1,075 206 107 306 179 210 — 2,362 Net loans charged off 12 (2,930 ) (202 ) (55 ) 148 (713 ) (295 ) — (4,035 ) Provision for loan losses (1) (88 ) (1,520 ) (397 ) (772 ) (844 ) 571 392 — (2,658 ) Balance at March 31, 2018 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 $ — $ 163,217 Three months ended March 31, 2017 Balance at December 31, 2016 $ 46,842 $ 54,353 $ 26,801 $ 22,929 $ 6,455 $ 3,574 $ 3,192 $ 4,533 $ 168,679 Loans charged off (1,224 ) (5,527 ) (698 ) (216 ) (247 ) (856 ) (639 ) — (9,407 ) Recoveries of loans previously charged off 450 4,191 137 230 548 236 137 — 5,929 Net loans charged off (774 ) (1,336 ) (561 ) 14 301 (620 ) (502 ) — (3,478 ) Provision for loan losses (1) 1,305 2,292 (2,419 ) (925 ) 745 77 578 3,222 4,875 Balance at March 31, 2017 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 (1) The provision for loan losses excluded an increase of $6.6 million and a decrease of $75,000 in the reserve for unfunded lending commitments for the three months ended March 31, 2018 and March 31, 2017, respectively. These amounts were reclassified to Other Liabilities. The following table presents loans, net of unearned income and their related allowance for loan losses, by portfolio segment: Real Estate - Commercial Mortgage Commercial - Industrial, Financial and Agricultural Real Estate - Home Equity Real Estate - Residential Mortgage Real Estate - Construction Consumer Leasing, other and overdrafts Unallocated Total (in thousands) Allowance for loan losses at March 31, 2018: Loans collectively evaluated for impairment $ 50,392 $ 51,314 $ 6,440 $ 5,610 $ 5,245 $ 1,887 $ 2,054 N/A $ 122,942 Loans individually evaluated for impairment 8,325 10,516 11,088 9,651 679 16 — N/A 40,275 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 N/A $ 163,217 Loans, net of unearned income at March 31, 2018 Loans collectively evaluated for impairment $ 6,279,144 $ 4,234,362 $ 1,489,429 $ 1,935,587 $ 965,398 $ 326,742 $ 271,042 N/A $ 15,501,704 Loans individually evaluated for impairment 53,364 64,710 24,812 40,937 10,733 24 — N/A 194,580 $ 6,332,508 $ 4,299,072 $ 1,514,241 $ 1,976,524 $ 976,131 $ 326,766 $ 271,042 N/A $ 15,696,284 Allowance for loan losses at March 31, 2017: Loans collectively evaluated for impairment $ 37,457 $ 43,155 $ 14,744 $ 10,581 $ 4,915 $ 3,007 $ 3,268 $ 7,755 $ 124,882 Loans individually evaluated for impairment 9,916 12,154 9,077 11,437 2,586 24 — N/A 45,194 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 Loans, net of unearned income at March 31, 2017: Loans collectively evaluated for impairment $ 6,067,492 $ 4,119,550 $ 1,576,949 $ 1,620,302 $ 869,225 $ 288,789 $ 243,983 N/A $ 14,786,290 Loans individually evaluated for impairment 51,041 48,259 18,952 44,840 13,758 37 — N/A 176,887 $ 6,118,533 $ 4,167,809 $ 1,595,901 $ 1,665,142 $ 882,983 $ 288,826 $ 243,983 N/A $ 14,963,177 N/A - Not applicable. Impaired Loans A loan is considered to be impaired if it is probable that all amounts will not be collected according to the contractual terms of the loan agreement. Impaired loans consist of all loans on non-accrual status and accruing troubled debt restructurings ("TDRs"). An allowance for loan losses is established for an impaired loan if its carrying value exceeds its estimated fair value. Impaired loans to borrowers with total outstanding commitments greater than or equal to $1.0 million are evaluated individually for impairment. Impaired loans to borrowers with total outstanding commitments less than $1.0 million are pooled and measured for impairment collectively. All loans individually evaluated for impairment are measured for losses on a quarterly basis. As of March 31, 2018 and December 31, 2017 , substantially all of the Corporation’s individually evaluated impaired loans with total outstanding balances greater than or equal to $1.0 million were measured based on the estimated fair value of each loan’s collateral. Collateral could be in the form of real estate, in the case of impaired commercial mortgages and construction loans, or business assets, such as accounts receivable or inventory, in the case of commercial and industrial loans. Commercial and industrial loans may also be secured by real estate. As of March 31, 2018 and 2017 , approximately 72% and 67% , respectively, of impaired loans with principal balances greater than or equal to $1.0 million , whose primary collateral is real estate, were measured at estimated fair value of the collateral using appraisals that had been updated in the preceding 12 months, performed by state certified third-party appraisers. When updated appraisals are not obtained for loans evaluated for impairment that are secured by real estate, fair values are estimated based on the original appraisal values, as long as the original appraisal indicated an acceptable loan-to-value position and, in the opinion of the Corporation's internal credit administration staff, there has not been a significant deterioration in the collateral value since the original appraisal was performed. Original appraisals are typically used only when the estimated collateral value, as adjusted for the age of the appraisal, results in a current loan-to-value ratio that is lower than the Corporation's loan-to-value requirements for new loans (generally less than 70% ). The following table presents total impaired loans by class segment: March 31, 2018 December 31, 2017 Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 29,862 $ 27,819 $ — $ 26,728 $ 22,886 $ — Commercial 46,673 40,525 — 44,936 39,550 — Real estate - residential mortgage 4,547 4,547 — 4,575 4,575 — Construction 12,343 7,842 — 12,477 8,100 — 93,425 80,733 88,716 75,111 With a related allowance recorded: Real estate - commercial mortgage 32,863 25,545 8,325 33,710 25,895 8,112 Commercial 29,723 24,185 10,516 29,816 24,175 11,406 Real estate - home equity 28,387 24,812 11,088 28,282 24,693 11,124 Real estate - residential mortgage 41,889 36,390 9,651 42,597 37,132 9,895 Construction 6,186 2,891 679 7,308 4,097 967 Consumer 25 24 16 26 26 17 139,073 113,847 40,275 141,739 116,018 41,521 Total $ 232,498 $ 194,580 $ 40,275 $ 230,455 $ 191,129 $ 41,521 As of March 31, 2018 and December 31, 2017 , there were $80.7 million and $75.1 million , respectively, of impaired loans that did not have a related allowance for loan loss. The estimated fair values of the collateral securing these loans exceeded their carrying amount, or the loans were previously charged down to realizable collateral values. Accordingly, no specific valuation allowance was considered to be necessary. The following table presents average impaired loans by class segment: Three months ended March 31 2018 2017 Average Interest Average Interest (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 25,353 $ 83 $ 23,842 $ 70 Commercial 40,038 73 25,574 36 Real estate - residential mortgage 4,561 27 4,673 26 Construction 7,971 — 5,046 2 77,923 183 59,135 134 With a related allowance recorded: Real estate - commercial mortgage 25,720 84 29,126 85 Commercial 24,181 44 23,044 32 Real estate - home equity 24,752 184 19,079 95 Real estate - residential mortgage 36,761 221 40,839 230 Construction 3,495 — 7,100 3 Consumer 25 — 38 — Leasing, other and overdrafts — — 713 — 114,934 533 119,939 445 Total $ 192,857 $ 716 $ 179,074 $ 579 (1) All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three months ended March 31, 2018 and 2017 represents amounts earned on accruing TDRs. Credit Quality Indicators and Non-performing Assets The following is a summary of the Corporation's internal risk rating categories: • Pass : These loans do not currently pose undue credit risk and can range from the highest to average quality, depending on the degree of potential risk. • Special Mention : These loans constitute an undue and unwarranted credit risk, but not to a point of justifying a classification of substandard. Loans in this category are currently acceptable, but are nevertheless potentially weak. • Substandard or Lower : These loans are inadequately protected by current sound worth and paying capacity of the borrower. There exists a well-defined weakness or weaknesses that jeopardize the normal repayment of the debt. The risk rating process allows management to identify credits that potentially carry more risk in a timely manner and to allocate resources to managing troubled accounts. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for the class segments presented above. The migration of loans through the various internal risk rating categories is a significant component of the allowance for credit loss methodology, which bases the probability of default on this migration. Assigning risk ratings involves judgment. The Corporation's loan review officers provide an independent assessment of risk rating accuracy. Ratings may be changed based on the ongoing monitoring procedures performed by loan officers or credit administration staff, or if specific loan review activities identify a deterioration or an improvement in the loan. The following table presents internal credit risk ratings for the indicated loan class segments: Pass Special Mention Substandard or Lower Total March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (dollars in thousands) Real estate - commercial mortgage $ 6,027,210 $ 6,066,396 $ 144,809 $ 147,604 $ 160,489 $ 150,804 $ 6,332,508 $ 6,364,804 Commercial - secured 3,873,737 3,831,485 100,242 121,842 180,234 179,113 4,154,213 4,132,440 Commercial - unsecured 139,139 159,620 3,378 5,478 2,342 2,759 144,859 167,857 Total commercial - industrial, financial and agricultural 4,012,876 3,991,105 103,620 127,320 182,576 181,872 4,299,072 4,300,297 Construction - commercial residential 141,587 143,759 4,613 5,259 12,282 14,084 158,482 163,102 Construction - commercial 744,274 761,218 834 846 3,688 3,752 748,796 765,816 Total construction (excluding Construction - other) 885,861 904,977 5,447 6,105 15,970 17,836 907,278 928,918 $ 10,925,947 $ 10,962,478 $ 253,876 $ 281,029 $ 359,035 $ 350,512 $ 11,538,858 $ 11,594,019 % of Total 94.7 % 94.6 % 2.2 % 2.4 % 3.1 % 3.0 % 100.0 % 100.0 % The Corporation does not assign internal risk ratings to smaller balance, homogeneous loans, such as home equity, residential mortgage, construction loans to individuals secured by residential real estate, consumer and lease receivables. For these loans, the most relevant credit quality indicator is delinquency status. The migration of loans through the various delinquency status categories is a significant component of the allowance for credit losses methodology for those loans, which bases the probability of default on this migration. The following table presents a summary of performing, delinquent and non-performing loans for the indicated loan class segments: Performing Delinquent (1) Non-performing (2) Total March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (dollars in thousands) Real estate - home equity $ 1,493,485 $ 1,535,557 $ 8,731 $ 12,655 $ 12,025 $ 11,507 $ 1,514,241 $ 1,559,719 Real estate - residential mortgage 1,938,817 1,914,888 17,539 18,852 20,168 20,971 1,976,524 1,954,711 Construction - other 68,363 77,403 — 203 490 411 68,853 78,017 Consumer - direct 55,681 54,828 323 315 54 70 56,058 55,213 Consumer - indirect 267,584 254,663 2,931 3,681 193 226 270,708 258,570 Total consumer 323,265 309,491 3,254 3,996 247 296 326,766 313,783 Leasing 270,027 267,111 843 855 172 32 271,042 267,998 $ 4,093,957 $ 4,104,450 $ 30,367 $ 36,561 $ 33,102 $ 33,217 $ 4,157,426 $ 4,174,228 % of Total 98.5 % 98.3 % 0.7 % 0.9 % 0.8 % 0.8 % 100.0 % 100.0 % (1) Includes all accruing loans 30 days to 89 days past due. (2) Includes all accruing loans 90 days or more past due and all non-accrual loans. The following table presents non-performing assets: March 31, December 31, (in thousands) Non-accrual loans $ 122,966 $ 124,749 Loans 90 days or more past due and still accruing 11,676 10,010 Total non-performing loans 134,642 134,759 Other real estate owned (OREO) 10,744 9,823 Total non-performing assets $ 145,386 $ 144,582 The following tables present past due status and non-accrual loans by portfolio segment and class segment: March 31, 2018 30-59 Days Past Due 60-89 Days Past Due ≥ 90 Days Past Due and Accruing Non- accrual Total ≥ 90 Days Total Past Due Current Total (in thousands) Real estate - commercial mortgage $ 11,606 $ 1,091 $ 1,001 $ 35,183 $ 36,184 $ 48,881 $ 6,283,627 $ 6,332,508 Commercial - secured 4,048 3,607 1,935 52,336 54,271 61,926 4,092,287 4,154,213 Commercial - unsecured 814 159 10 634 644 1,617 143,242 144,859 Total commercial - industrial, financial and agricultural 4,862 3,766 1,945 52,970 54,915 63,543 4,235,529 4,299,072 Real estate - home equity 6,401 2,330 3,280 8,745 12,025 20,756 1,493,485 1,514,241 Real estate - residential mortgage 12,725 4,814 4,833 15,335 20,168 37,707 1,938,817 1,976,524 Construction - commercial residential — — — 10,422 10,422 10,422 148,060 158,482 Construction - commercial — — — 19 19 19 748,777 748,796 Construction - other — — 198 292 490 490 68,363 68,853 Total real estate - construction — — 198 10,733 10,931 10,931 965,200 976,131 Consumer - direct 211 112 54 — 54 377 55,681 56,058 Consumer - indirect 2,253 678 193 — 193 3,124 267,584 270,708 Total consumer 2,464 790 247 — 247 3,501 323,265 326,766 Leasing, other and overdrafts 662 181 172 — 172 1,015 270,027 271,042 Total $ 38,720 $ 12,972 $ 11,676 $ 122,966 $ 134,642 $ 186,334 $ 15,509,950 $ 15,696,284 December 31, 2017 30-59 Days Past Due 60-89 Days Past Due ≥ 90 Days Past Due and Accruing Non- accrual Total ≥ 90 Days Total Past Due Current Total (in thousands) Real estate - commercial mortgage $ 9,456 $ 4,223 $ 625 $ 34,822 $ 35,447 $ 49,126 $ 6,315,678 $ 6,364,804 Commercial - secured 4,778 5,254 1,360 52,255 53,615 63,647 4,068,793 4,132,440 Commercial - unsecured 305 10 45 649 694 1,009 166,848 167,857 Total commercial - industrial, financial and agricultural 5,083 5,264 1,405 52,904 54,309 64,656 4,235,641 4,300,297 Real estate - home equity 9,640 3,015 2,372 9,135 11,507 24,162 1,535,557 1,559,719 Real estate - residential mortgage 11,961 6,891 5,280 15,691 20,971 39,823 1,914,888 1,954,711 Construction - commercial residential — 439 — 11,767 11,767 12,206 150,896 163,102 Construction - commercial 483 — — 19 19 502 765,314 765,816 Construction - other 203 — — 411 411 614 77,403 78,017 Total real estate - construction 686 439 — 12,197 12,197 13,322 993,613 1,006,935 Consumer - direct 260 55 70 — 70 385 54,828 55,213 Consumer - indirect 3,055 626 226 — 226 3,907 254,663 258,570 Total consumer 3,315 681 296 — 296 4,292 309,491 313,783 Leasing, other and overdrafts 568 287 32 — 32 887 267,111 267,998 Total $ 40,709 $ 20,800 $ 10,010 $ 124,749 $ 134,759 $ 196,268 $ 15,571,979 $ 15,768,247 The following table presents TDRs, by class segment: March 31, December 31, (in thousands) Real-estate - residential mortgage $ 25,602 $ 26,016 Real-estate - commercial mortgage 18,181 13,959 Real estate - home equity 16,067 15,558 Commercial 11,740 10,820 Consumer 24 26 Total accruing TDRs 71,614 66,379 Non-accrual TDRs (1) 24,897 29,051 Total TDRs $ 96,511 $ 95,430 (1) Included in non-accrual loans in the preceding table detailing non-performing assets. The following table presents TDRs, by class segment and type of concession for loans that were modified during the three months ended March 31, 2018 and 2017 : Three months ended March 31 2018 2017 Number of Loans Post-Modification Recorded Investment Number of Loans Post-Modification Recorded Investment (dollars in thousands) Real estate – residential mortgage: Extend maturity without rate concession — — 2 337 Bankruptcy 1 5 1 178 Real estate - commercial mortgage: Extend maturity without rate concession — — 1 318 Real estate - home equity: Extend maturity without rate concession 17 1,276 16 1,284 Bankruptcy 2 108 7 453 Commercial: Extend maturity without rate concession 9 9,359 4 3,126 Total 29 $ 10,748 31 $ 5,696 The following table presents TDRs, by class segment, as of March 31, 2018 and 2017 , that were modified in the previous 12 months and had a post-modification payment default during the three months ended March 31, 2018 and 2017 . The Corporation defines a payment default as a single missed payment. 2018 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Real estate - residential mortgage 5 $ 332 8 $ 2,006 Real estate - commercial mortgage 1 180 2 430 Real estate - home equity 18 1,000 14 639 Commercial 6 526 6 3,654 Construction 2 1,484 — — Total 32 $ 3,522 30 $ 6,729

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights The following table summarizes the changes in mortgage servicing rights ("MSRs"), which are included in other assets on the consolidated balance sheets: Three months ended March 31 2018 2017 (in thousands) Amortized cost: Balance at beginning of period $ 37,663 $ 38,822 Originations of mortgage servicing rights 1,483 1,183 Amortization (1,398 ) (1,462 ) Balance at end of period $ 37,748 $ 38,543 Valuation allowance: Valuation Allowance - Balance at beginning and end of period $ — $ (1,291 ) Net MSRs at end of period $ 37,748 $ 37,252 MSRs represent the economic value of existing contractual rights to service mortgage loans that have been sold. Accordingly, actual and expected prepayments of the underlying mortgage loans can impact the value of MSRs. The Corporation accounts for MSRs at the lower of amortized cost or fair value. The fair value of MSRs is estimated by discounting the estimated cash flows from servicing income, net of expense, over the expected life of the underlying loans at a discount rate commensurate with the risk associated with these assets. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. Based on its fair value analysis, the Corporation determined a valuation allowance was not necessary as of March 31, 2018. For the three months ended March 31, 2017, the Corporation determined that no adjustment to the valuation allowance of $1.3 million was necessary. Additions and reductions to the valuation allowance are recorded as decreases and increases, respectively, to "mortgage banking income" on the consolidated statements of income.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Corporation grants equity awards to employees, consisting of stock options, restricted stock, RSUs and PSUs under its Amended and Restated Equity and Cash Incentive Compensation Plan ("Employee Equity Plan"). In addition, employees may purchase stock under the Corporation’s Employee Stock Purchase Plan. The fair value of equity awards granted to employees is recognized as compensation expense over the period during which employees are required to provide service in exchange for such awards. Compensation expense for PSUs is also recognized over the period during which employees are required to provide service in exchange for such awards, however, compensation expense may vary based on the expectations for actual performance relative to defined performance measures. The Corporation also grants equity awards to non-employee members of its board of directors under the 2011 Directors’ Equity Participation Plan ("Directors’ Plan"). Under the Directors’ Plan, the Corporation can grant equity awards to non-employee holding company and subsidiary bank directors in the form of stock options, restricted stock or common stock. Equity awards issued under the Employee Equity Plan are generally granted annually and become fully vested over or after a three -year vesting period. The vesting period for non-performance-based awards represents the period during which employees are required to provide service in exchange for such awards. Equity awards under the Directors' Plan generally vest immediately upon grant. Certain events, as defined in the Employee Equity Plan and the Directors' Plan, result in the acceleration of the vesting of equity awards. Fair values for RSUs and a majority of PSUs are based on the trading price of the Corporation’s stock on the date of grant and earn dividend equivalents during the vesting period, which are forfeitable if the awards do not vest. The fair value of certain PSUs are estimated through the use of the Monte Carlo valuation methodology as of the date of grant. As of March 31, 2018 , the Employee Equity Plan had 11.1 million shares reserved for future grants through 2023 , and the Directors’ Plan had approximately 360,000 shares reserved for future grants through 2021 . The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended March 31 2018 2017 (in thousands) Compensation expense $ 1,510 $ 734 Tax benefit (461 ) (744 ) Stock-based compensation expense, net of tax benefit $ 1,049 $ (10 ) For the quarter ended March 31, 2017, the tax benefit exceeded the stock-based compensation expense as a result of excess tax benefits related to stock option exercises during the quarter, which were recorded as a reduction to income tax expense as required under ASU 2016-09.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended March 31 2018 2017 (in thousands) Interest cost $ 831 $ 830 Expected return on plan assets (451 ) (451 ) Net amortization and deferral 664 663 Net periodic pension cost $ 1,044 $ 1,042 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following: Three months ended March 31 2018 2017 (in thousands) Interest cost $ 17 $ 17 Net accretion and deferral (141 ) (141 ) Net periodic benefit $ (124 ) $ (124 ) The Corporation recognizes the funded status of its Pension Plan and Postretirement Plan on the consolidated balance sheets and recognizes the change in that funded status through other comprehensive income.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Corporation manages its exposure to certain interest rate and foreign currency risks through the use of derivatives. None of the Corporation's outstanding derivative contracts are designated as hedges, and none are entered into for speculative purposes. Derivative instruments are carried at fair value, with changes in fair value recognized in earnings as components of non-interest income or non-interest expense on the consolidated statements of income. Derivative contracts create counterparty credit risk with both the Corporation's customers and with institutional counterparties. The Corporation manages counterparty credit risk through its credit approval processes, monitoring procedures and obtaining adequate collateral, when the Corporation determines it is appropriate to do so and in accordance with counterparty contracts. Mortgage Banking Derivatives In connection with its mortgage banking activities, the Corporation enters into commitments to originate certain fixed-rate residential mortgage loans for customers, also referred to as interest rate locks. In addition, the Corporation enters into forward commitments for the future sales or purchases of mortgage-backed securities to or from third-party counterparties to hedge the effect of changes in interest rates on the values of both the interest rate locks and mortgage loans held for sale. Forward sales commitments may also be in the form of commitments to sell individual mortgage loans at a fixed price at a future date. The amount necessary to settle each interest rate lock is based on the price that secondary market investors would pay for loans with similar characteristics, including interest rate and term, as of the date fair value is measured. Gross derivative assets and liabilities are recorded in other assets and other liabilities, respectively, on the consolidated balance sheets, and changes in fair values during the period are recorded in mortgage banking income on the consolidated statements of income. Interest Rate Swaps The Corporation enters into interest rate swaps with certain qualifying commercial loan customers to meet their interest rate risk management needs. The Corporation simultaneously enters into interest rate swaps with dealer counterparties, with identical notional amounts and terms. The net result of these interest rate swaps is that the customer pays a fixed rate of interest and the Corporation receives a floating rate. These interest rate swaps are derivative financial instruments and the gross fair values are recorded in other assets and other liabilities on the consolidated balance sheets, with changes in fair values during the period recorded in other non-interest expense on the consolidated statements of income. Fulton Bank, N.A. ("Fulton Bank"), the Corporation's largest banking subsidiary, exceeded $10 billion in total assets as of December 31, 2016 and is required to clear all eligible interest rate swap contracts with a central counterparty, effective January 1, 2017. As a result, Fulton Bank is subject to the regulations of the Commodity Futures Trading Commission ("CFTC"). Foreign Exchange Contracts The Corporation enters into foreign exchange contracts to accommodate the needs of its customers. Foreign exchange contracts are commitments to buy or sell foreign currency on a specific date at a contractual price. The Corporation limits its foreign exchange exposure with customers by entering into contracts with institutional counterparties to mitigate its foreign exchange risk. The Corporation also holds certain amounts of foreign currency with international correspondent banks ("Foreign Currency Nostro Accounts"). The Corporation limits the total overnight net foreign currency open positions, which is defined as an aggregate of all outstanding contracts and Foreign Currency Nostro Account balances, to $500,000 . Gross fair values are recorded in other assets and other liabilities on the consolidated balance sheets, with changes in fair values during the period recorded in other service charges and fees on the consolidated statements of income. The following table presents a summary of the notional amounts and fair values of derivative financial instruments: March 31, 2018 December 31, 2017 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 142,131 $ 1,210 $ 129,469 $ 1,059 Negative fair values 10,572 (81 ) 8,957 (59 ) Net interest rate locks with customers 1,129 1,000 Forward Commitments Positive fair values 112,544 47 3,856 34 Negative fair values — — 100,808 (213 ) Net forward commitments 47 (179 ) Interest Rate Swaps with Customers Positive fair values 464,300 7,581 1,316,548 24,505 Negative fair values 1,654,770 (44,696 ) 716,634 (18,978 ) Net interest rate swaps with customers (37,115 ) 5,527 Interest Rate Swaps with Dealer Counterparties Positive fair values (1) (3) 1,654,770 39,466 716,634 18,941 Negative fair values (2) (3) 464,300 (6,475 ) 1,316,548 (19,764 ) Net interest rate swaps with dealer counterparties 32,991 (823 ) Foreign Exchange Contracts with Customers Positive fair values 9,914 228 4,852 276 Negative fair values 3,330 (64 ) 5,914 (119 ) Net foreign exchange contracts with customers 164 157 Foreign Exchange Contracts with Correspondent Banks Positive fair values 13,953 182 7,960 184 Negative fair values 8,682 (165 ) 6,048 (255 ) Net foreign exchange contracts with correspondent banks 17 (71 ) Net derivative fair value asset $ (2,767 ) $ 5,611 (1) Includes centrally cleared interest rate swaps with a notional amount of $371.1 million and a fair value of $0 as of March 31, 2018 and a notional amount of $24.4 million and a fair value of $0 as of December 31, 2017 . (2) Includes centrally cleared interest rate swaps with a notional amount of $83.3 million and a fair value of $0 as of March 31, 2018 and a notional amount of $377.1 million and a fair value of $0 as of December 31, 2017 . (3) The variation margin posted as collateral on centrally cleared interest rate swaps, which represents the fair value of such swaps, is legally characterized as settlements of the outstanding derivative contracts instead of cash collateral. Accordingly, the fair values of centrally cleared interest rate swaps were offset by variation margins of $4.3 million at March 31, 2018 , increasing the fair value of such swaps to $0 , and $4.6 million at December 31, 2017 , reducing the fair value of such swaps to $0 . The following table presents a summary of the fair value (losses) gains on derivative financial instruments: Three months ended March 31 2018 2017 (in thousands) Interest rate locks with customers $ 129 $ 845 Forward commitments 226 (2,379 ) Interest rate swaps with customers (42,642 ) (815 ) Interest rate swaps with dealer counterparties (1) 33,814 3,001 Foreign exchange contracts with customers 7 8 Foreign exchange contracts with correspondent banks 88 (37 ) Net fair value gains on derivative financial instruments $ (8,378 ) $ 623 (1) Not included is $8.9 million of gains representing the change in the variation margin for the three months ended March 31, 2018 and $2.2 million of losses representing the change in the variation margin for the three months ended March 31, 2017 . Fair Value Option The Corporation has elected to measure mortgage loans held for sale at fair value. Derivative financial instruments related to mortgage banking activities are also recorded at fair value, as noted above. The Corporation determines fair value for its mortgage loans held for sale based on the price that secondary market investors would pay for loans with similar characteristics, including interest rate and term, as of the date fair value is measured. Changes in fair values during the period are recorded as components of mortgage banking income on the consolidated statements of income. The following table presents a summary of the Corporation’s mortgage loans held for sale: March 31, December 31, (in thousands) Cost (1) $ 23,186 $ 31,069 Fair value 23,450 31,530 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance. For the three months ended March 31, 2018 , losses related to changes in fair values of mortgage loans held for sale were $197,000 and, for the three months ended March 31, 2017 , gains were $539,000 . Balance Sheet Offsetting Although certain financial assets and liabilities may be eligible for offset on the consolidated balance sheets because they are subject to master netting arrangements or similar agreements, the Corporation elects to not offset such qualifying assets and liabilities. The Corporation is a party to interest rate swap transactions with financial institution counterparties and customers, disclosed in detail above. Under these agreements, the Corporation has the right to net-settle multiple contracts with the same counterparty in the event of default on, or termination of, any one contract. Cash collateral is posted by the party with a net liability position in accordance with contract thresholds and can be used to settle the fair value of the interest rate swap agreements in the event of default. A daily settlement occurs through a clearing agent for changes in the fair value of centrally cleared derivatives. As a result, the total fair values of interest rate swap derivative assets and derivative liabilities recognized on the consolidated balance sheet are not equal and offsetting. The Corporation is also a party to foreign currency exchange contracts with financial institution counterparties, under which the Corporation has the right to net-settle multiple contracts with the same counterparty in the event of default on, or termination of, any one contract. As with interest rate swap contracts, collateral is posted by the party with a net liability position in accordance with contract thresholds and can be used to settle the fair value of the foreign currency exchange contracts in the event of default. The Corporation also enters into agreements with customers in which it sells securities subject to an obligation to repurchase the same or similar securities, referred to as repurchase agreements. Under these agreements, the Corporation may transfer legal control over the assets but still maintain effective control through agreements that both entitle and obligate the Corporation to repurchase the assets. Therefore, repurchase agreements are reported as secured borrowings, classified in short-term borrowings on the consolidated balance sheets, while the securities underlying the repurchase agreements remain classified with investment securities on the consolidated balance sheets. The Corporation has no intention of setting off these amounts. Therefore, these repurchase agreements are not eligible for offset. The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2018 Interest rate swap derivative assets $ 47,047 $ (7,339 ) $ (34,170 ) $ 5,538 Foreign exchange derivative assets with correspondent banks 182 (165 ) — 17 Total $ 47,229 $ (7,504 ) $ (34,170 ) $ 5,555 Interest rate swap derivative liabilities $ 51,171 $ (7,339 ) $ (8,806 ) $ 35,026 Foreign exchange derivative liabilities with correspondent banks 165 (165 ) — — Total $ 51,336 $ (7,504 ) $ (8,806 ) $ 35,026 December 31, 2017 Interest rate swap derivative assets $ 43,446 $ (16,844 ) $ — $ 26,602 Foreign exchange derivative assets with correspondent banks 184 (184 ) — — Total $ 43,630 $ (17,028 ) $ — $ 26,602 Interest rate swap derivative liabilities $ 38,742 $ (16,844 ) $ (6,588 ) $ 15,310 Foreign exchange derivative liabilities with correspondent banks 255 (184 ) — 71 Total $ 38,997 $ (17,028 ) $ (6,588 ) $ 15,381 (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments The Corporation is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. Those financial instruments include commitments to extend credit and letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized on the Corporation’s consolidated balance sheets. Exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and letters of credit is represented by the outstanding amount of those instruments. The outstanding amounts of commitments to extend credit and letters of credit were as follows: March 31, December 31, 2017 (in thousands) Commitments to extend credit $ 6,418,380 $ 6,205,029 Standby letters of credit 318,827 326,973 Commercial letters of credit 43,709 41,801 The Corporation records a reserve for unfunded lending commitments, which represents management’s estimate of losses associated with unused commitments to extend credit and letters of credit. See Note 5, "Loans and Allowance for Credit Losses," for additional details. Residential Lending Residential mortgages originated and sold by the Corporation consist primarily of conforming, prime loans sold to government sponsored agencies, such as the Federal National Mortgage Association ("Fannie Mae") and the Federal Home Loan Mortgage Corporation ("Freddie Mac"). Certain prime loans may also be sold to non-government sponsored agency investors. The Corporation provides customary representations and warranties to government sponsored entities and investors that specify, among other things, that the loans have been underwritten to the standards established by the government sponsored entity or investor. The Corporation may be required to repurchase a loan, or reimburse the government sponsored entity or investor for a credit loss incurred on a loan, if it is determined that the representations and warranties have not been met. Such repurchases or reimbursements generally result from an underwriting or documentation deficiency. As of both March 31, 2018 and December 31, 2017 , outstanding repurchase requests totaled approximately $543,000 . From 2000 to 2011 , the Corporation sold loans to the Federal Home Loan Bank of Pittsburgh under its Mortgage Partnership Finance Program ("MPF Program"). The Corporation provided a "credit enhancement" for residential mortgage loans sold under the MPF Program whereby it would assume credit losses in excess of a defined "First Loss Account," or "FLA" balance, up to specified amounts. The FLA is funded by the Federal Home Loan Bank of Pittsburgh based on a percentage of the outstanding principal balance of loans sold. As of March 31, 2018 , the unpaid principal balance of loans sold under the MPF Program was approximately $80 million . As of March 31, 2018 and December 31, 2017 , the reserve for estimated credit losses related to loans sold under the MPF Program was $1.1 million and $1.2 million , respectively. Required reserves are calculated based on delinquency status and estimated loss rates established through the Corporation's existing allowance for credit losses methodology for residential mortgage loans. As of March 31, 2018 and December 31, 2017 , the total reserve for losses on residential mortgage loans sold was $2.1 million , respectively, including both reserves for credit losses under the MPF Program and reserves for representation and warranty exposures. Management believes that the reserves recorded as of March 31, 2018 are adequate. However, declines in collateral values, the identification of additional loans to be repurchased, or a deterioration in the credit quality of loans sold under the MPF Program could necessitate additional reserves, established through charges to earnings, in the future. In 2017, the Corporation began selling certain non-prime loans to Fannie Mae, under programs designed to extend credit to borrowers who do not meet the underwriting criteria for conforming, prime loans. Under this program, loans sold must be repurchased by the Corporation if they become delinquent, as defined in the agreement, within three years of the date the loan is funded. In the first quarter of 2018, approximately $44.9 million of loans were sold under this program, and the total unpaid principal balance of loans sold under this program was $58.4 million at March 31, 2018. Based on the credit characteristics of this portfolio, no reserve for estimated credit losses for these loans has been recognized in the consolidated balance sheet at March 31, 2018. Legal Proceedings The Corporation is involved in various pending and threatened claims and other legal proceedings in the ordinary course of business activities of the Corporation. The Corporation evaluates the possible impact of these matters, taking into consideration the most recent information available. A loss reserve is established for those matters for which the Corporation believes a loss is both probable and reasonably estimable. Once established, the reserve is adjusted as appropriate to reflect any subsequent developments. Actual losses may be more or less than the amount estimated by the Corporation. For matters where a loss is not probable, or the amount of the loss cannot be estimated by the Corporation, no loss reserve is established. In addition, from time to time, the Corporation is the subject of investigations or other forms of regulatory or governmental inquiry covering a range of possible issues and, in some cases, these may be part of similar reviews of the specified activities of other industry participants. These inquiries could lead to administrative, civil or criminal proceedings, and could possibly result in fines, penalties, restitution or the need to alter the Corporation’s business practices, and cause the Corporation to incur additional costs. The Corporation’s practice is to cooperate fully with regulatory and governmental investigations. As of the date of this report, the Corporation believes that any liabilities, individually or in the aggregate, which may result from the final outcomes of pending proceedings will not have a material adverse effect on the financial condition of the Corporation. However, legal proceedings are often unpredictable, and it is possible that the ultimate resolution of any such matters, if unfavorable, may be material to the Corporation’s results of operations for any particular period, depending, in part, upon the size of the loss or liability imposed and the operating results for the applicable period. BSA/AML Enforcement Orders The Corporation and three of its bank subsidiaries are subject to regulatory enforcement orders issued during 2014 and 2015 by their respective federal and state bank regulatory agencies relating to identified deficiencies in the Corporation’s centralized Bank Secrecy Act and anti-money laundering compliance program (the "BSA/AML Compliance Program"), which was designed to comply with the requirements of the Bank Secrecy Act, the USA Patriot Act of 2001 and related anti-money laundering regulations (collectively, the "BSA/AML Requirements"). The regulatory enforcement orders, which are in the form of consent orders or orders to cease and desist issued upon consent ("Consent Orders"), generally require, among other things, that the Corporation and the affected bank subsidiaries undertake a number of required actions to strengthen and enhance the BSA/AML Compliance Program, and, in some cases, conduct retrospective reviews of past account activity and transactions, as well as certain reports filed in accordance with the BSA/AML Requirements, to determine whether suspicious activity and certain transactions in currency were properly identified and reported in accordance with the BSA/AML Requirements. The Corporation and the affected bank subsidiaries have implemented numerous enhancements to the BSA/AML Compliance Program, completed the retrospective reviews required under the Consent Orders, and continue to strengthen and refine the BSA/AML Compliance Program to achieve a sustainable program in accordance with the BSA/AML Requirements. In addition to requiring strengthening and enhancement of the BSA/AML Compliance Program, while the Consent Orders remain in effect, the Corporation and the affected bank subsidiaries are subject to certain restrictions on expansion activities. Further, any failure to comply with the requirements of any of the Consent Orders involving the Corporation or the affected bank subsidiaries could result in further enforcement actions, the imposition of material restrictions on the activities of the Corporation or its bank subsidiaries, or the assessment of fines or penalties. As previously disclosed, on October 27, 2017, the Office of the Comptroller of the Currency (the "OCC") terminated the Consent Orders that it issued on July 14, 2014 to three of the Corporation's bank subsidiaries, Fulton Bank, N.A., FNB Bank, N.A. and Swineford National Bank, relating to deficiencies in the BSA/AML Compliance Programs at those bank subsidiaries. Fair Lending Investigation During the second quarter of 2015, Fulton Bank, N.A., the Corporation’s largest bank subsidiary, received a letter from the U.S. Department of Justice (the "Department") indicating that the Department had initiated an investigation regarding potential violations of fair lending laws (specifically, the Equal Credit Opportunity Act and the Fair Housing Act) by Fulton Bank, N.A. in certain geographies. Fulton Bank, N.A. has been and is cooperating with the Department and responding to the Department’s requests for information. During the third quarter of 2016, the Department informed the Corporation, Fulton Bank, N.A., and three of the Corporation’s other bank subsidiaries, Fulton Bank of New Jersey, The Columbia Bank and Lafayette Ambassador Bank, that the Department was expanding its investigation of potential lending discrimination on the basis of race and national origin to encompass additional geographies that were not included in the initial letter from the Department. In addition to requesting information concerning the lending activities of these bank subsidiaries, the Department also requested information concerning the Corporation and the residential mortgage lending activities conducted under the Fulton Mortgage Company brand, the trade name used by all of the Corporation’s bank subsidiaries for residential mortgage lending. The investigation relates to lending activities during the period January 1, 2009 to the present. The Corporation and the identified bank subsidiaries are cooperating with the Department and responding to the Department’s requests for information. The Corporation and its bank subsidiaries are not able at this time to determine the terms on which this investigation will be resolved or the timing of such resolution, or to reliably estimate the amounts of any settlement, fines or other penalties or the cost of any other remedial actions, if enforcement action is taken. In addition, should the investigation result in an enforcement action against the Corporation or its bank subsidiaries, or a settlement with the Department, the ability of the Corporation and its bank subsidiaries to engage in certain expansion or other activities may be restricted.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements FASB ASC Topic 820 establishes a fair value hierarchy for the inputs to valuation techniques used to measure assets and liabilities at fair value using the following three categories (from highest to lowest priority): • Level 1 – Inputs that represent quoted prices for identical instruments in active markets. • Level 2 – Inputs that represent quoted prices for similar instruments in active markets, or quoted prices for identical instruments in non-active markets. Also includes valuation techniques whose inputs are derived principally from observable market data other than quoted prices, such as interest rates or other market-corroborated means. • Level 3 – Inputs that are largely unobservable, as little or no market data exists for the instrument being valued. The Corporation has categorized all assets and liabilities measured at fair value on both a recurring and nonrecurring basis into the above three levels. The following tables present summaries of the Corporation’s assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 23,450 $ — $ 23,450 Available for sale investment securities: U.S. Government sponsored agency securities — 20,962 — 20,962 State and municipal securities — 406,099 — 406,099 Corporate debt securities — 97,995 3,960 101,955 Collateralized mortgage obligations — 679,700 — 679,700 Residential mortgage-backed securities — 1,054,166 — 1,054,166 Commercial mortgage-backed securities — 226,892 — 226,892 Auction rate securities — — 103,049 103,049 Total available for sale investment securities — 2,485,814 107,009 2,592,823 Other assets 19,505 48,304 — 67,809 Total assets $ 19,505 $ 2,557,568 $ 107,009 $ 2,684,082 Other liabilities $ 19,307 $ 51,251 $ — $ 70,558 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 31,530 $ — $ 31,530 Available for sale investment securities: Equity securities 918 — — 918 U.S. Government sponsored agency securities — 5,938 — 5,938 State and municipal securities — 408,949 — 408,949 Corporate debt securities — 93,552 3,757 97,309 Collateralized mortgage obligations — 602,623 — 602,623 Residential mortgage-backed securities — 1,120,796 — 1,120,796 Commercial mortgage-backed securities — 212,755 — 212,755 Auction rate securities — — 98,668 98,668 Total available for sale investment securities 918 2,444,613 102,425 2,547,956 Other assets 19,451 44,539 — 63,990 Total assets $ 20,369 $ 2,520,682 $ 102,425 $ 2,643,476 Other liabilities $ 19,357 $ 39,014 $ — $ 58,371 The valuation techniques used to measure fair value for the items in the preceding tables are as follows: • Mortgage loans held for sale – This category consists of mortgage loans held for sale that the Corporation has elected to measure at fair value. Fair values as of March 31, 2018 and December 31, 2017 were measured based on the price that secondary market investors were offering for loans with similar characteristics. See Note 9, "Derivative Financial Instruments" for details related to the Corporation’s election to measure assets and liabilities at fair value. • Available for sale investment securities – Included in this asset category are both equity and debt securities. Level 2 available for sale debt securities are valued by a third-party pricing service commonly used in the banking industry. The pricing service uses pricing models that vary based on asset class and incorporate available market information, including quoted prices of investment securities with similar characteristics. Because many fixed income securities do not trade on a daily basis, pricing models use available information, as applicable, through processes such as benchmark yield curves, benchmarking of like securities, sector groupings, and matrix pricing. Standard market inputs include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data, including market research publications. For certain security types, additional inputs may be used, or some of the standard market inputs may not be applicable. Management tests the values provided by the pricing service by obtaining securities prices from an alternative third-party source and comparing the results. This test is performed for at least 80% of the securities valued by the pricing service. Generally, differences by security in excess of 5% are researched to reconcile the difference. • Equity securities – As of March 31, 2018, the Corporation did not hold any equity securities. Equity securities held as of December 31, 2017 consisted of common stocks of financial institutions and other equity investments. These Level 1 investments were measured at fair value based on quoted prices for identical securities in active markets. • U.S. Government sponsored agency securities/State and municipal securities/Collateralized mortgage obligations/Residential mortgage-backed securities/Commercial mortgage-backed securities – These debt securities are classified as Level 2 investments. Fair values are determined by a third-party pricing service, as detailed above. • Corporate debt securities – This category consists of subordinated debt and senior debt issued by financial institutions ( $66.6 million at March 31, 2018 and $61.9 million at December 31, 2017 ), single-issuer trust preferred securities issued by financial institutions ( $30.5 million at March 31, 2018 and $30.7 million at December 31, 2017 ), pooled trust preferred securities issued by financial institutions ( $865,000 at March 31, 2018 and $707,000 at December 31, 2017 ) and other corporate debt issued by non-financial institutions ( $4.0 million at both March 31, 2018 and December 31, 2017 ). Level 2 investments include the Corporation’s holdings of subordinated debt and senior debt, other corporate debt issued by non-financial institutions and $27.4 million and $27.7 million of single-issuer trust preferred securities held at March 31, 2018 and December 31, 2017 , respectively. The fair values for these corporate debt securities are determined by a third-party pricing service, as detailed above. Level 3 investments include the Corporation’s investments in pooled trust preferred securities ( $865,000 at March 31, 2018 and $707,000 at December 31, 2017 ) and certain single-issuer trust preferred securities ( $3.1 million at both March 31, 2018 and at December 31, 2017 ). The fair values of these securities were determined based on quotes provided by third-party brokers who determined fair values based predominantly on internal valuation models which were not indicative prices or binding offers. The Corporation’s third-party pricing service cannot derive fair values for these securities primarily due to inactive markets for similar investments. Level 3 values are tested by management primarily through trend analysis, by comparing current values to those reported at the end of the preceding calendar quarter, and determining if they are reasonable based on price and spread movements for this asset class. • Auction rate securities – Due to their illiquidity, ARCs are classified as Level 3 investments and are valued through the use of an expected cash flows model prepared by a third-party valuation expert. The assumptions used in preparing the expected cash flows model include estimates for coupon rates, time to maturity and market rates of return. The most significant unobservable input to the expected cash flows model is an assumed return to market liquidity sometime in the next five years. If the assumed return to market liquidity was lengthened beyond the next five years, this would result in a decrease in the fair value of these ARCs. The Corporation believes that the trusts underlying the ARCs will self-liquidate as student loans are repaid. Level 3 fair values are tested by management through the performance of a trend analysis of the market price and discount rate. Changes in the price and discount rates are compared to changes in market data, including bond ratings, parity ratios, balances and delinquency levels. Other assets – Included in this category are the following: • Level 1 assets include mutual funds that are held in trust for employee deferred compensation plans ( $19.1 million at March 31, 2018 and $19.0 million at December 31, 2017 ) and the fair value of foreign currency exchange contracts ( $428,000 at March 31, 2018 and $460,000 at December 31, 2017 ). The mutual funds and foreign exchange prices used to measure these items at fair value are based on quoted prices for identical instruments in active markets. • Level 2 assets include the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ( $1.2 million at March 31, 2018 and $1.1 million at December 31, 2017 ) and the fair value of interest rate swaps ( $47.0 million at March 31, 2018 and $43.4 million at December 31, 2017 ). The fair values of the Corporation’s interest rate locks, forward commitments and interest rate swaps represent the amounts that would be required to settle the derivative financial instruments at the balance sheet date. See Note 9, "Derivative Financial Instruments," for additional information. Other liabilities – Included in this category are the following: • Level 1 liabilities include employee deferred compensation liabilities which represent amounts due to employees under deferred compensation plans ( $19.1 million at March 31, 2018 and $19.0 million at December 31, 2017 ) and the fair value of foreign currency exchange contracts ( $229,000 at March 31, 2018 and $374,000 at December 31, 2017 ). The fair value of these liabilities are determined in the same manner as the related assets, as described under the heading "Other assets" above. • Level 2 liabilities include the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ( $81,000 at March 31, 2018 and $272,000 at December 31, 2017 ) and the fair value of interest rate swaps ( $51.2 million at March 31, 2018 and $37.8 million at December 31, 2017 ). The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Other assets" above. The following table presents the changes in the Corporation’s available for sale investment securities measured at fair value on a recurring basis using unobservable inputs (Level 3): Three months ended March 31, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at December 31, 2017 $ 707 $ 3,050 $ 98,668 Unrealized adjustment to fair value (1) 158 42 4,381 Discount accretion (2) — 3 — Balance at March 31, 2018 $ 865 $ 3,095 $ 103,049 Three months ended March 31, 2017 Balance at December 31, 2016 $ 422 $ 2,450 $ 97,256 Unrealized adjustment to fair value (1) — 297 86 Discount accretion (2) — 3 97 Balance at March 31, 2017 $ 422 $ 2,750 $ 97,439 (1) Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of "available for sale investment securities" on the consolidated balance sheets. (2) Included as a component of "net interest income" on the consolidated statements of income. Certain assets are not measured at fair value on an ongoing basis, but are subject to fair value measurement in certain circumstances, such as upon their acquisition or when there is evidence of impairment. The following table presents the Corporation’s Level 3 financial assets measured at fair value on a nonrecurring basis and reported on the Corporation’s consolidated balance sheets: March 31, 2018 December 31, 2017 (in thousands) Net loans $ 154,305 $ 149,608 OREO 10,744 9,823 MSRs 37,748 37,663 Total assets $ 202,797 $ 197,094 The valuation techniques used to measure fair value for the items in the table above are as follows: • Net loans – This category consists of loans that were collectively evaluated for impairment and have been classified as Level 3 assets. The amount shown is the balance of impaired loans, net of the related allowance for loan losses. See Note 5, "Loans and Allowance for Credit Losses," for additional details. • OREO – This category includes OREO, classified as Level 3 assets. Fair values for OREO were based on estimated selling prices less estimated selling costs for similar assets in active markets. • MSRs – This category includes MSRs, classified as Level 3 assets. MSRs are initially recorded at fair value upon the sale of residential mortgage loans to secondary market investors. MSRs are amortized as a reduction to servicing income over the estimated lives of the underlying loans. MSRs are stratified and evaluated for impairment by comparing each stratum's carrying amount to its estimated fair value. Fair values are determined at the end of each quarter through a discounted cash flows valuation performed by a third-party valuation expert. Significant inputs to the valuation included expected net servicing income, the discount rate and the expected life of the underlying loans. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. The weighted average annual constant prepayment rate and the weighted average discount rate used in the March 31, 2018 valuation were 9.7% and 9.5% , respectively. Management tests the reasonableness of the significant inputs to the third-party valuation in comparison to market data. As required by FASB ASC Section 825-10-50, the following table details the book values and estimated fair values of the Corporation’s financial instruments as of March 31, 2018 and December 31, 2017 . In addition, a general description of the methods and assumptions used to estimate such fair values is also provided. March 31, 2018 Amortized Cost Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 100,151 $ 100,151 $ — $ — $ 100,151 Interest-bearing deposits with other banks 210,906 210,906 — — 210,906 Federal Reserve Bank and Federal Home Loan Bank stock 56,900 — 56,900 — 56,900 Loans held for sale 23,450 — 23,450 — 23,450 Available for sale investment securities 2,592,823 — 2,485,814 107,009 2,592,823 Net Loans 15,533,067 — — 14,933,445 14,933,445 Accrued interest receivable 53,060 53,060 — — 53,060 Other financial assets 216,952 120,156 48,304 48,492 216,952 FINANCIAL LIABILITIES Demand and savings deposits $ 12,763,521 $ 12,763,521 $ — $ — $ 12,763,521 Brokered deposits 64,195 64,195 — — 64,195 Time deposits 2,649,387 — 2,647,498 — 2,647,498 Short-term borrowings 937,852 937,852 — — 937,852 Accrued interest payable 9,681 9,681 — — 9,681 Other financial liabilities 209,483 158,232 51,251 — 209,483 Federal Home Loan Bank advances and long-term debt 938,499 — 914,763 — 914,763 December 31, 2017 Book Value Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 108,291 $ 108,291 $ — $ — $ 108,291 Interest-bearing deposits with other banks 293,805 293,805 — — 293,805 Federal Reserve Bank and Federal Home Loan Bank stock 60,761 — 60,761 — 60,761 Loans held for sale 31,530 — 31,530 — 31,530 Available for sale investment securities 2,547,956 918 2,444,613 102,425 2,547,956 Net Loans 15,598,337 — — 15,380,974 15,380,974 Accrued interest receivable 52,910 52,910 — — 52,910 Other financial assets 215,464 123,439 44,539 47,486 215,464 FINANCIAL LIABILITIES Demand and savings deposits $ 13,042,147 $ 13,042,147 $ — $ — $ 13,042,147 Brokered deposits 90,473 90,473 — — 90,473 Time deposits 2,664,912 — 2,664,912 — 2,664,912 Short-term borrowings 617,524 617,524 — — 617,524 Accrued interest payable 9,317 9,317 — — 9,317 Other financial liabilities 227,569 188,555 39,014 — 227,569 Federal Home Loan Bank advances and long-term debt 1,038,346 — 1,038,346 — 1,038,346 Fair values of financial instruments are significantly affected by the assumptions used, principally the timing of future cash flows and discount rates. Because assumptions are inherently subjective in nature, the estimated fair values cannot be substantiated by comparison to independent market quotes and, in many cases, the estimated fair values could not necessarily be realized in an immediate sale or settlement of the instrument. The aggregate fair value amounts presented do not necessarily represent management’s estimate of the underlying value of the Corporation. For short-term financial instruments, defined as those with remaining maturities of 90 days or less, and excluding those recorded at fair value on the Corporation’s consolidated balance sheets, book value was considered to be a reasonable estimate of fair value. The following instruments are predominantly short-term: Assets Liabilities Cash and due from banks Demand and savings deposits Interest-bearing deposits with other banks Short-term borrowings Accrued interest receivable Accrued interest payable Federal Reserve Bank and Federal Home Loan Bank ("FHLB") stock represent restricted investments and are carried at cost on the consolidated balance sheets. As of March 31, 2018, Fair values for loans and time deposits were estimated by discounting future cash flows using the current rates, as adjusted for liquidity considerations, at which similar loans would be made to borrowers and similar deposits would be issued to customers for the same remaining maturities. Fair values of loans also include estimated credit losses that would be assumed in a market transaction. Fair values estimated in this manner are considered to represent estimated exit prices, required by ASU 2016-01, as of March 31, 2018. As of December 31, 2017, loan fair values do not fully incorporate an exit price approach to fair value. The fair values of FHLB advances and long-term debt were estimated by discounting the remaining contractual cash flows using a rate at which the Corporation could issue debt with similar remaining maturities as of the balance sheet date. These borrowings would be categorized in Level 2 liabilities under FASB ASC Topic 820.

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of Fulton Financial Corporation (the "Corporation") have been prepared in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as revenues and expenses during the period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017 . Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the Securities and Exchange Commission ("SEC").
Recently Issued Accounting Standards	Recently Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") Update 2014-09, "Revenue from Contracts with Customers." This standards update established a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle prescribed by this standards update is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard applies to all contracts with customers, except those that are within the scope of other topics in the FASB ASC. The Corporation adopted this standard, and all subsequent Accounting Standards Updates ("ASU") that modified it on January 1, 2018 under the modified retrospective approach with no material impact on its consolidated financial statements. The Corporation evaluated the impact of the adoption of ASC Update 2014-09 on its consolidated financial statements and did not identify any significant changes in the timing of revenue recognition as a result of this amended guidance. The sources of revenue for the Corporation are interest income from loans and investments, net of interest expense on deposits and borrowings, and non-interest income. Non-interest income is earned from various banking and financial services that the Corporation offers through its subsidiary banks. Revenue is recognized as earned based on contractual terms, as transactions occur, or as services are provided. Following is further detail of the various types of revenue the Corporation earns and when it is recognized. Interest income : Interest income is recognized on an accrual basis according to loan agreements, securities contracts or other such written contracts and is outside the scope of ASC Update 2014-09. Investment management and trust services: Consists of trust commission income, brokerage income, money market income and insurance commission income. Trust commission income consists of advisory fees that are based on market values of clients' managed portfolios and transaction fees for fiduciary services performed, both of which are recognized as earned. Brokerage income includes advisory fees which are recognized as earned on a monthly basis and transaction fees that are recognized when transactions occur. Money market income is based on the balances held in trust accounts and is recognized monthly. Insurance commission income is earned and recognized when policies are originated. Currently, no investment management and trust service income is based on performance or investment results. Service charges on deposit accounts: Consists of cash management, overdraft, non-sufficient fund fees and other service charges on deposit accounts. Revenue is primarily transactional and recognized when earned, at the time the transactions occur. Other service charges and fees: Consists of branch fees, automated teller machine fees, debit card income and merchant services fees. These fees are primarily transactional, and revenue is recognized when transactions occur. Also included in other service charges and fees are letter of credit fees, foreign exchange income and commercial loan interest rate swap fees, which are outside the scope of ASC Update 2014-09. Mortgage banking income: Consists of gains or losses on the sale of residential mortgage loans and mortgage loan servicing income. These revenues are outside the scope of ASC Update 2014-09. Other Income: Includes credit card income, gains on sales of Small Business Association ("SBA") loans, cash surrender value of life insurance, and other miscellaneous income. These items are either outside the scope of ASC Update 2014-09 or are immaterial. In January 2016, the FASB issued ASC Update 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities." ASC Update 2016-01 provides guidance regarding the income statement impact of equity investments held by an entity and the recognition of changes in fair value of financial liabilities when the fair value option is elected. This standard requires equity investments to be measured at fair value, with changes recorded in net income. This ASU also requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes. ASC Update 2016-01 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-01 did not have a material impact on its consolidated financial statements. In August 2016, the FASB issued ASC Update 2016-15, "Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments." This standards update provides guidance regarding the presentation of certain cash receipts and cash payments in the statement of cash flows, addressing eight specific cash flow classification issues, in order to reduce existing diversity in practice. ASC Update 2016-15 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-15 did not have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASC Update 2016-18, "Statement of Cash Flows - Restricted Cash." This standards update provides guidance regarding the presentation of restricted cash in the statement of cash flows. The update requires companies to include amounts generally described as restricted cash and restricted cash equivalents, along with cash and cash equivalents, when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. It also requires an entity to disclose the nature of the restrictions on cash and cash equivalents. ASC Update 2016-18 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2016-18 did not have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASC Update 2017-07, "Improving the Presentation of Net Periodic Pension Costs and Net Periodic Benefit Cost." This standards update requires a company to present service cost separately from the other components of net benefit cost. In addition, the update provides explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. ASC Update 2017-07 was effective for interim and annual reporting periods beginning after December 15, 2017. The Corporation adopted this standards update effective with its March 31, 2018 quarterly report on Form 10-Q and the adoption of ASC Update 2017-07 did not have a material impact on its consolidated financial statements. In February 2018, the FASB issued ASC Update 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." This ASU permits a reclassification from accumulated other comprehensive income ("AOCI") to retained earnings of the stranded tax effects resulting from the application of the Tax Cuts and Jobs Act of 2017 ("Tax Act"), which changed the corporate tax rate from 35% to 21%. This ASU is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Corporation adopted this standards update effective January 1, 2018 and elected to reclassify $7.1 million of stranded tax effects from AOCI to retained earnings at the beginning of the period of adoption. The Corporation's policy for releasing income tax effects from accumulated other comprehensive income is to release them as investments are sold or mature and pension and post-retirement liabilities are extinguished. Recently Issued Accounting Standards In February 2016, the FASB issued ASC Update 2016-02, "Leases." This standards update states that a lessee should recognize the assets and liabilities that arise from all leases with a term greater than 12 months. The core principle requires the lessee to recognize a liability to make lease payments and a "right-of-use" asset. The accounting applied by the lessor is relatively unchanged. The standards update also requires expanded qualitative and quantitative disclosures. The FASB has also issued amendments to this standard (ASC Updates 2017-13, 2018-01). ASC Update 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2019 quarterly report on Form 10-Q. The Corporation is currently evaluating the impact of the adoption of ASC Update 2016-02 on its consolidated financial statements. The Corporation currently operates a number of branches that are leased, with the leases accounted for as operating leases that are not recognized on the consolidated balance sheet. Under ASC Update 2016-02, right-of-use assets and lease liabilities will need to be recognized on the consolidated balance sheet for these branches, which will also have an impact on regulatory capital ratios. The recognition of operating leases on the Corporation's consolidated balance sheet is expected to be the most significant impact of the adoption of this standards update. In June 2016, the FASB issued ASC Update 2016-13, "Financial Instruments - Credit Losses." The new impairment model prescribed by this standards update is a single impairment model for all financial assets (i.e., loans and held to maturity investments). The recognition of credit losses would be based on an entity’s current estimate of expected losses (referred to as the Current Expected Credit Loss model, or "CECL"), as opposed to recognition of losses only when they are probable under current U.S. GAAP. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. ASC Update 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2020 quarterly report on Form 10-Q. The Corporation is currently evaluating the impact of the adoption of ASC Update 2016-13 on its consolidated financial statements and disclosures. While the Corporation is currently unable to reasonably estimate the impact of adopting ASU 2016-13, it expects that the impact of adoption could be significantly influenced by the composition, characteristics and quality of its loan portfolio as well as the prevailing economic conditions and forecasts as of the adoption date. As part of the evaluation process, the Corporation has established a steering committee and working group that includes individuals from various functional areas to assess processes, portfolio segmentation, systems requirements and needed resources to implement this new accounting standard. In January 2017, the FASB issued ASC Update 2017-04, "Intangibles - Goodwill and Other." This standards update eliminates Step 2 of the goodwill impairment test which measures the impairment amount. Identifying and measuring impairment will take place in a single quantitative step. In addition, no separate qualitative assessment for reporting units with zero or negative carrying amount is required. Entities must disclose the existence of these reporting units and the amount of goodwill allocated to them. This update should be applied on a prospective basis, and an entity is required to disclose the nature of and reason for the change in accounting principle upon transition. ASC Update 2017-04 is effective for annual or interim goodwill impairment tests in reporting periods beginning after December 15, 2019. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its 2020 goodwill impairment test and does not expect the adoption of ASC Update 2017-04 to have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASC Update 2017-08, "Premium Amortization on Purchased Callable Debt Securities." This standards update requires that a company amortize the premium on callable debt securities to the earliest call date versus current U.S. GAAP which requires amortization over the contractual life of the securities. The amortization period for callable debt securities purchased at a discount would not be impacted by the new accounting standards update. This amendment is to be adopted on a modified retrospective basis with a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. ASC Update 2017-08 is effective for annual or interim reporting periods beginning after December 15, 2018. Early adoption is permitted. The Corporation intends to adopt this standards update effective with its March 31, 2019 quarterly report on Form 10-Q and does not expect the adoption of ASC Update 2017-08 to have a material impact on its consolidated financial statements. Reclassifications Certain amounts in the 2017 consolidated financial statements and notes have been reclassified to conform to the 2018 presentation. On the Consolidated Statements of Cash Flows, the net change in tax credit investments is presented as cash flows from investing activities. Prior to the quarter ended March 31, 2018, these cash flows were presented as cash flows from operating activities, included in the net increase (decrease) in other liabilities. The presentation of the cash flows for the quarter ended March 31, 2017 were changed to conform to this presentation, resulting in a $5.3 million decrease in net cash flows used in investing activities and a corresponding increase in net cash flows provided by operating activities. The change had no impact on net income or retained earnings. In addition, the Corporation will revise the Consolidated Statements of Cash Flows for each of the comparative 2017 periods in future filings.

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of Weighted Average Common Shares Outstanding	A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows: Three months ended March 31 2018 2017 (in thousands) Weighted average shares outstanding (basic) 175,303 174,150 Impact of common stock equivalents 1,265 1,427 Weighted average shares outstanding (diluted) 176,568 175,577

Accumulated Other Comprehensi22

Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Changes in other comprehensive income	The following table presents changes in other comprehensive income (loss): Before-Tax Amount Tax Effect Net of Tax Amount (in thousands) Three months ended March 31, 2018 Unrealized loss on securities $ (34,991 ) $ 7,347 $ (27,644 ) Reclassification adjustment for securities gains included in net income (1) (19 ) 3 (16 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 285 (61 ) 224 Amortization of net unrecognized pension and postretirement items (2) 430 (91 ) 339 Total Other Comprehensive Loss $ (34,295 ) $ 7,198 $ (27,097 ) Three months ended March 31, 2017 Unrealized gain on securities $ 6,575 $ (2,302 ) $ 4,273 Reclassification adjustment for securities gains included in net income (1) (1,106 ) 387 (719 ) Amortization of net unrecognized pension and postretirement items (2) 528 (185 ) 343 Total Other Comprehensive Income $ 5,997 $ (2,100 ) $ 3,897 (1) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See Note 4, "Investment Securities," for additional details. (2) Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See Note 8, "Employee Benefit Plans," for additional details.
Changes in each component of accumulated other comprehensive income	The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax: Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended March 31, 2018 Balance at December 31, 2017 $ (18,509 ) $ 458 $ (14,923 ) $ (32,974 ) Other comprehensive loss before reclassifications (27,644 ) 224 — (27,420 ) Amounts reclassified from accumulated other comprehensive income (loss) (16 ) — 339 323 Reclassification of stranded tax effects (3,887 ) — (3,214 ) (7,101 ) Balance at March 31, 2018 $ (50,056 ) $ 682 $ (17,798 ) $ (67,172 ) Three months ended March 31, 2017 Balance at December 31, 2016 $ (23,047 ) $ 273 $ (15,675 ) $ (38,449 ) Other comprehensive income before reclassifications 4,273 — — 4,273 Amounts reclassified from accumulated other comprehensive income (loss) (719 ) — 343 (376 ) Balance at March 31, 2017 $ (19,493 ) $ 273 $ (15,332 ) $ (34,552 )

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Values of Investment Securities	The following table presents the amortized cost and estimated fair values of investment securities, which were all classified as available for sale: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (in thousands) March 31, 2018 U.S. Government sponsored agency securities $ 21,105 $ 40 $ (183 ) $ 20,962 State and municipal securities 413,632 2,247 (9,780 ) 406,099 Corporate debt securities 101,367 2,482 (1,894 ) 101,955 Collateralized mortgage obligations 695,840 236 (16,376 ) 679,700 Residential mortgage-backed securities 1,084,582 3,006 (33,422 ) 1,054,166 Commercial mortgage-backed securities 231,378 15 (4,501 ) 226,892 Auction rate securities 107,410 — (4,361 ) 103,049 Total $ 2,655,314 $ 8,026 $ (70,517 ) $ 2,592,823 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (in thousands) December 31, 2017 U.S. Government sponsored agency securities $ 5,962 $ 2 $ (26 ) $ 5,938 State and municipal securities 405,860 5,638 (2,549 ) 408,949 Corporate debt securities 96,353 2,832 (1,876 ) 97,309 Collateralized mortgage obligations 611,927 491 (9,795 ) 602,623 Residential mortgage-backed securities 1,132,080 3,957 (15,241 ) 1,120,796 Commercial mortgage-backed securities 215,351 — (2,596 ) 212,755 Auction rate securities 107,410 — (8,742 ) 98,668 Total debt securities 2,574,943 12,920 (40,825 ) 2,547,038 Equity securities 776 142 — 918 Total $ 2,575,719 $ 13,062 $ (40,825 ) $ 2,547,956
Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities	The amortized cost and estimated fair values of debt securities as of March 31, 2018 , by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties. Amortized Estimated (in thousands) Due in one year or less $ 14,055 $ 14,063 Due from one year to five years 36,871 36,986 Due from five years to ten years 119,069 119,529 Due after ten years 473,519 461,487 643,514 632,065 Residential mortgage-backed securities (1) 1,084,582 1,054,166 Commercial mortgage-backed securities (1) 231,378 226,892 Collateralized mortgage obligations (1) 695,840 679,700 Total $ 2,655,314 $ 2,592,823 (1) Maturities for mortgage-backed securities and collateralized mortgage obligations are dependent upon the interest rate environment and prepayments on the underlying loans.
Summary of Gains and Losses from Equity and Debt Securities, and Losses Recognized from Other-than-Temporary Impairment	The following table presents information related to the gross realized gains on the sales of equity and debt securities: Gross Three months ended March 31, 2018 (in thousands) Equity securities $ 9 Debt securities 10 Total $ 19 Three months ended March 31, 2017 Equity securities $ 1,045 Debt securities 61 Total $ 1,106
Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in Continuous Unrealized Loss Position	The following table presents the gross unrealized losses and estimated fair values of investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2018 and December 31, 2017: Less than 12 months 12 months or longer Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses March 31, 2018 (in thousands) U.S. Government sponsored agency securities $ 12,499 $ (183 ) $ — $ — $ 12,499 $ (183 ) State and municipal securities 163,345 (3,132 ) 114,024 (6,648 ) 277,369 (9,780 ) Corporate debt securities 9,466 (130 ) 28,219 (1,764 ) 37,685 (1,894 ) Collateralized mortgage obligations 456,200 (7,184 ) 176,076 (9,192 ) 632,276 (16,376 ) Residential mortgage-backed securities 527,502 (13,611 ) 471,703 (19,811 ) 999,205 (33,422 ) Commercial mortgage-backed securities 196,887 (3,884 ) 21,539 (617 ) 218,426 (4,501 ) Auction rate securities — — 103,049 (4,361 ) 103,049 (4,361 ) Total $ 1,365,899 $ (28,124 ) $ 914,610 $ (42,393 ) $ 2,280,509 $ (70,517 ) Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized December 31, 2017 (in thousands) U.S. Government sponsored agency securities $ 5,830 $ (26 ) $ — $ — $ 5,830 $ (26 ) State and municipal securities 11,650 (50 ) 118,297 (2,499 ) 129,947 (2,549 ) Corporate debt securities 4,544 (48 ) 32,163 (1,828 ) 36,707 (1,876 ) Collateralized mortgage obligations 303,932 (2,408 ) 187,690 (7,387 ) 491,622 (9,795 ) Residential mortgage-backed securities 511,378 (4,348 ) 500,375 (10,893 ) 1,011,753 (15,241 ) Commercial mortgage-backed securities 190,985 (2,118 ) 21,770 (478 ) 212,755 (2,596 ) Auction rate securities — — 98,668 (8,742 ) 98,668 (8,742 ) Total $ 1,028,319 $ (8,998 ) $ 958,963 $ (31,827 ) $ 1,987,282 $ (40,825 )
Summary of Amortized Cost and Fair Values of Corporate Debt Securities	The following table presents the amortized cost and estimated fair values of corporate debt securities: March 31, 2018 December 31, 2017 Amortized cost Estimated fair value Amortized cost Estimated fair value (in thousands) Single-issuer trust preferred securities $ 31,352 $ 30,513 $ 31,335 $ 30,703 Subordinated debt 54,011 54,357 49,013 49,533 Senior debt 12,029 12,245 12,031 12,392 Pooled trust preferred securities — 865 — 707 Corporate debt securities issued by financial institutions 97,392 97,980 92,379 93,335 Other corporate debt securities 3,975 3,975 3,974 3,974 Available for sale corporate debt securities $ 101,367 $ 101,955 $ 96,353 $ 97,309

Loans and Allowance for Credi24

Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Summary of Gross Loans by Type	Loans, net of unearned income are summarized as follows: March 31, December 31, 2017 (in thousands) Real-estate - commercial mortgage $ 6,332,508 $ 6,364,804 Commercial - industrial, financial and agricultural 4,299,072 4,300,297 Real-estate - residential mortgage 1,976,524 1,954,711 Real-estate - home equity 1,514,241 1,559,719 Real-estate - construction 976,131 1,006,935 Consumer 326,766 313,783 Leasing and other 297,465 291,556 Overdrafts 2,031 4,113 Loans, gross of unearned income 15,724,738 15,795,918 Unearned income (28,454 ) (27,671 ) Loans, net of unearned income $ 15,696,284 $ 15,768,247
Schedule of Allowance for Credit Losses	The following table presents the components of the allowance for credit losses: March 31, December 31, (in thousands) Allowance for loan losses $ 163,217 $ 169,910 Reserve for unfunded lending commitments 12,802 6,174 Allowance for credit losses $ 176,019 $ 176,084
Activity in the Allowance for Credit Losses	The following table presents the activity in the allowance for credit losses: Three months ended March 31 2018 2017 (in thousands) Balance at beginning of period $ 176,084 $ 171,325 Loans charged off (6,397 ) (9,407 ) Recoveries of loans previously charged off 2,362 5,929 Net loans charged off (4,035 ) (3,478 ) Provision for credit losses 3,970 4,800 Balance at end of period $ 176,019 $ 172,647 The Corporation has historically maintained an unallocated allowance for credit losses for factors and conditions that exist at the balance sheet date, but are not specifically identifiable, and to recognize the inherent imprecision in estimating and measuring loss exposure. In the second quarter of 2017, enhancements were made to allow for the impact of these factors and conditions to be quantified in the allowance allocation process. Accordingly, an unallocated allowance for credit losses is no longer necessary. The following table presents the activity in the allowance for loan losses by portfolio segment: Real Estate - Commercial Mortgage Commercial - Industrial, Financial and Agricultural Real Estate - Home Equity Real Estate - Residential Mortgage Real Estate - Construction Consumer Leasing, other and overdrafts Unallocated Total (in thousands) Three months ended March 31, 2018 Balance at December 31, 2017 $ 58,793 $ 66,280 $ 18,127 $ 16,088 $ 6,620 $ 2,045 $ 1,957 $ — $ 169,910 Loans charged off (267 ) (4,005 ) (408 ) (162 ) (158 ) (892 ) (505 ) — (6,397 ) Recoveries of loans previously charged off 279 1,075 206 107 306 179 210 — 2,362 Net loans charged off 12 (2,930 ) (202 ) (55 ) 148 (713 ) (295 ) — (4,035 ) Provision for loan losses (1) (88 ) (1,520 ) (397 ) (772 ) (844 ) 571 392 — (2,658 ) Balance at March 31, 2018 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 $ — $ 163,217 Three months ended March 31, 2017 Balance at December 31, 2016 $ 46,842 $ 54,353 $ 26,801 $ 22,929 $ 6,455 $ 3,574 $ 3,192 $ 4,533 $ 168,679 Loans charged off (1,224 ) (5,527 ) (698 ) (216 ) (247 ) (856 ) (639 ) — (9,407 ) Recoveries of loans previously charged off 450 4,191 137 230 548 236 137 — 5,929 Net loans charged off (774 ) (1,336 ) (561 ) 14 301 (620 ) (502 ) — (3,478 ) Provision for loan losses (1) 1,305 2,292 (2,419 ) (925 ) 745 77 578 3,222 4,875 Balance at March 31, 2017 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 (1) The provision for loan losses excluded an increase of $6.6 million and a decrease of $75,000 in the reserve for unfunded lending commitments for the three months ended March 31, 2018 and March 31, 2017, respectively. These amounts were reclassified to Other Liabilities. The following table presents loans, net of unearned income and their related allowance for loan losses, by portfolio segment: Real Estate - Commercial Mortgage Commercial - Industrial, Financial and Agricultural Real Estate - Home Equity Real Estate - Residential Mortgage Real Estate - Construction Consumer Leasing, other and overdrafts Unallocated Total (in thousands) Allowance for loan losses at March 31, 2018: Loans collectively evaluated for impairment $ 50,392 $ 51,314 $ 6,440 $ 5,610 $ 5,245 $ 1,887 $ 2,054 N/A $ 122,942 Loans individually evaluated for impairment 8,325 10,516 11,088 9,651 679 16 — N/A 40,275 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 N/A $ 163,217 Loans, net of unearned income at March 31, 2018 Loans collectively evaluated for impairment $ 6,279,144 $ 4,234,362 $ 1,489,429 $ 1,935,587 $ 965,398 $ 326,742 $ 271,042 N/A $ 15,501,704 Loans individually evaluated for impairment 53,364 64,710 24,812 40,937 10,733 24 — N/A 194,580 $ 6,332,508 $ 4,299,072 $ 1,514,241 $ 1,976,524 $ 976,131 $ 326,766 $ 271,042 N/A $ 15,696,284 Allowance for loan losses at March 31, 2017: Loans collectively evaluated for impairment $ 37,457 $ 43,155 $ 14,744 $ 10,581 $ 4,915 $ 3,007 $ 3,268 $ 7,755 $ 124,882 Loans individually evaluated for impairment 9,916 12,154 9,077 11,437 2,586 24 — N/A 45,194 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 Loans, net of unearned income at March 31, 2017: Loans collectively evaluated for impairment $ 6,067,492 $ 4,119,550 $ 1,576,949 $ 1,620,302 $ 869,225 $ 288,789 $ 243,983 N/A $ 14,786,290 Loans individually evaluated for impairment 51,041 48,259 18,952 44,840 13,758 37 — N/A 176,887 $ 6,118,533 $ 4,167,809 $ 1,595,901 $ 1,665,142 $ 882,983 $ 288,826 $ 243,983 N/A $ 14,963,177 N/A - Not applicable
Total Impaired Loans by Class Segment	The following table presents total impaired loans by class segment: March 31, 2018 December 31, 2017 Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 29,862 $ 27,819 $ — $ 26,728 $ 22,886 $ — Commercial 46,673 40,525 — 44,936 39,550 — Real estate - residential mortgage 4,547 4,547 — 4,575 4,575 — Construction 12,343 7,842 — 12,477 8,100 — 93,425 80,733 88,716 75,111 With a related allowance recorded: Real estate - commercial mortgage 32,863 25,545 8,325 33,710 25,895 8,112 Commercial 29,723 24,185 10,516 29,816 24,175 11,406 Real estate - home equity 28,387 24,812 11,088 28,282 24,693 11,124 Real estate - residential mortgage 41,889 36,390 9,651 42,597 37,132 9,895 Construction 6,186 2,891 679 7,308 4,097 967 Consumer 25 24 16 26 26 17 139,073 113,847 40,275 141,739 116,018 41,521 Total $ 232,498 $ 194,580 $ 40,275 $ 230,455 $ 191,129 $ 41,521 As of March 31, 2018 and December 31, 2017 , there were $80.7 million and $75.1 million , respectively, of impaired loans that did not have a related allowance for loan loss. The estimated fair values of the collateral securing these loans exceeded their carrying amount, or the loans were previously charged down to realizable collateral values. Accordingly, no specific valuation allowance was considered to be necessary. The following table presents average impaired loans by class segment: Three months ended March 31 2018 2017 Average Interest Average Interest (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 25,353 $ 83 $ 23,842 $ 70 Commercial 40,038 73 25,574 36 Real estate - residential mortgage 4,561 27 4,673 26 Construction 7,971 — 5,046 2 77,923 183 59,135 134 With a related allowance recorded: Real estate - commercial mortgage 25,720 84 29,126 85 Commercial 24,181 44 23,044 32 Real estate - home equity 24,752 184 19,079 95 Real estate - residential mortgage 36,761 221 40,839 230 Construction 3,495 — 7,100 3 Consumer 25 — 38 — Leasing, other and overdrafts — — 713 — 114,934 533 119,939 445 Total $ 192,857 $ 716 $ 179,074 $ 579 (1) All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three months ended March 31, 2018 and 2017 represents amounts earned on accruing TDRs.
Financing Receivable Credit Quality Indicators	The following table presents internal credit risk ratings for the indicated loan class segments: Pass Special Mention Substandard or Lower Total March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (dollars in thousands) Real estate - commercial mortgage $ 6,027,210 $ 6,066,396 $ 144,809 $ 147,604 $ 160,489 $ 150,804 $ 6,332,508 $ 6,364,804 Commercial - secured 3,873,737 3,831,485 100,242 121,842 180,234 179,113 4,154,213 4,132,440 Commercial - unsecured 139,139 159,620 3,378 5,478 2,342 2,759 144,859 167,857 Total commercial - industrial, financial and agricultural 4,012,876 3,991,105 103,620 127,320 182,576 181,872 4,299,072 4,300,297 Construction - commercial residential 141,587 143,759 4,613 5,259 12,282 14,084 158,482 163,102 Construction - commercial 744,274 761,218 834 846 3,688 3,752 748,796 765,816 Total construction (excluding Construction - other) 885,861 904,977 5,447 6,105 15,970 17,836 907,278 928,918 $ 10,925,947 $ 10,962,478 $ 253,876 $ 281,029 $ 359,035 $ 350,512 $ 11,538,858 $ 11,594,019 % of Total 94.7 % 94.6 % 2.2 % 2.4 % 3.1 % 3.0 % 100.0 % 100.0 % The following table presents a summary of performing, delinquent and non-performing loans for the indicated loan class segments: Performing Delinquent (1) Non-performing (2) Total March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (dollars in thousands) Real estate - home equity $ 1,493,485 $ 1,535,557 $ 8,731 $ 12,655 $ 12,025 $ 11,507 $ 1,514,241 $ 1,559,719 Real estate - residential mortgage 1,938,817 1,914,888 17,539 18,852 20,168 20,971 1,976,524 1,954,711 Construction - other 68,363 77,403 — 203 490 411 68,853 78,017 Consumer - direct 55,681 54,828 323 315 54 70 56,058 55,213 Consumer - indirect 267,584 254,663 2,931 3,681 193 226 270,708 258,570 Total consumer 323,265 309,491 3,254 3,996 247 296 326,766 313,783 Leasing 270,027 267,111 843 855 172 32 271,042 267,998 $ 4,093,957 $ 4,104,450 $ 30,367 $ 36,561 $ 33,102 $ 33,217 $ 4,157,426 $ 4,174,228 % of Total 98.5 % 98.3 % 0.7 % 0.9 % 0.8 % 0.8 % 100.0 % 100.0 % (1) Includes all accruing loans 30 days to 89 days past due. (2) Includes all accruing loans 90 days or more past due and all non-accrual loans.
Non-Performing Assets	The following table presents non-performing assets: March 31, December 31, (in thousands) Non-accrual loans $ 122,966 $ 124,749 Loans 90 days or more past due and still accruing 11,676 10,010 Total non-performing loans 134,642 134,759 Other real estate owned (OREO) 10,744 9,823 Total non-performing assets $ 145,386 $ 144,582
Past due Loan Status and Non-Accrual Loans by Portfolio Segment	The following tables present past due status and non-accrual loans by portfolio segment and class segment: March 31, 2018 30-59 Days Past Due 60-89 Days Past Due ≥ 90 Days Past Due and Accruing Non- accrual Total ≥ 90 Days Total Past Due Current Total (in thousands) Real estate - commercial mortgage $ 11,606 $ 1,091 $ 1,001 $ 35,183 $ 36,184 $ 48,881 $ 6,283,627 $ 6,332,508 Commercial - secured 4,048 3,607 1,935 52,336 54,271 61,926 4,092,287 4,154,213 Commercial - unsecured 814 159 10 634 644 1,617 143,242 144,859 Total commercial - industrial, financial and agricultural 4,862 3,766 1,945 52,970 54,915 63,543 4,235,529 4,299,072 Real estate - home equity 6,401 2,330 3,280 8,745 12,025 20,756 1,493,485 1,514,241 Real estate - residential mortgage 12,725 4,814 4,833 15,335 20,168 37,707 1,938,817 1,976,524 Construction - commercial residential — — — 10,422 10,422 10,422 148,060 158,482 Construction - commercial — — — 19 19 19 748,777 748,796 Construction - other — — 198 292 490 490 68,363 68,853 Total real estate - construction — — 198 10,733 10,931 10,931 965,200 976,131 Consumer - direct 211 112 54 — 54 377 55,681 56,058 Consumer - indirect 2,253 678 193 — 193 3,124 267,584 270,708 Total consumer 2,464 790 247 — 247 3,501 323,265 326,766 Leasing, other and overdrafts 662 181 172 — 172 1,015 270,027 271,042 Total $ 38,720 $ 12,972 $ 11,676 $ 122,966 $ 134,642 $ 186,334 $ 15,509,950 $ 15,696,284 December 31, 2017 30-59 Days Past Due 60-89 Days Past Due ≥ 90 Days Past Due and Accruing Non- accrual Total ≥ 90 Days Total Past Due Current Total (in thousands) Real estate - commercial mortgage $ 9,456 $ 4,223 $ 625 $ 34,822 $ 35,447 $ 49,126 $ 6,315,678 $ 6,364,804 Commercial - secured 4,778 5,254 1,360 52,255 53,615 63,647 4,068,793 4,132,440 Commercial - unsecured 305 10 45 649 694 1,009 166,848 167,857 Total commercial - industrial, financial and agricultural 5,083 5,264 1,405 52,904 54,309 64,656 4,235,641 4,300,297 Real estate - home equity 9,640 3,015 2,372 9,135 11,507 24,162 1,535,557 1,559,719 Real estate - residential mortgage 11,961 6,891 5,280 15,691 20,971 39,823 1,914,888 1,954,711 Construction - commercial residential — 439 — 11,767 11,767 12,206 150,896 163,102 Construction - commercial 483 — — 19 19 502 765,314 765,816 Construction - other 203 — — 411 411 614 77,403 78,017 Total real estate - construction 686 439 — 12,197 12,197 13,322 993,613 1,006,935 Consumer - direct 260 55 70 — 70 385 54,828 55,213 Consumer - indirect 3,055 626 226 — 226 3,907 254,663 258,570 Total consumer 3,315 681 296 — 296 4,292 309,491 313,783 Leasing, other and overdrafts 568 287 32 — 32 887 267,111 267,998 Total $ 40,709 $ 20,800 $ 10,010 $ 124,749 $ 134,759 $ 196,268 $ 15,571,979 $ 15,768,247
Troubled Debt Restructurings on Financing Receivables	The following table presents TDRs, by class segment: March 31, December 31, (in thousands) Real-estate - residential mortgage $ 25,602 $ 26,016 Real-estate - commercial mortgage 18,181 13,959 Real estate - home equity 16,067 15,558 Commercial 11,740 10,820 Consumer 24 26 Total accruing TDRs 71,614 66,379 Non-accrual TDRs (1) 24,897 29,051 Total TDRs $ 96,511 $ 95,430 (1) Included in non-accrual loans in the preceding table detailing non-performing assets
Loan Terms Modified Under Troubled Debt Restructurings	The following table presents TDRs, by class segment and type of concession for loans that were modified during the three months ended March 31, 2018 and 2017 : Three months ended March 31 2018 2017 Number of Loans Post-Modification Recorded Investment Number of Loans Post-Modification Recorded Investment (dollars in thousands) Real estate – residential mortgage: Extend maturity without rate concession — — 2 337 Bankruptcy 1 5 1 178 Real estate - commercial mortgage: Extend maturity without rate concession — — 1 318 Real estate - home equity: Extend maturity without rate concession 17 1,276 16 1,284 Bankruptcy 2 108 7 453 Commercial: Extend maturity without rate concession 9 9,359 4 3,126 Total 29 $ 10,748 31 $ 5,696 The following table presents TDRs, by class segment, as of March 31, 2018 and 2017 , that were modified in the previous 12 months and had a post-modification payment default during the three months ended March 31, 2018 and 2017 . The Corporation defines a payment default as a single missed payment. 2018 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Real estate - residential mortgage 5 $ 332 8 $ 2,006 Real estate - commercial mortgage 1 180 2 430 Real estate - home equity 18 1,000 14 639 Commercial 6 526 6 3,654 Construction 2 1,484 — — Total 32 $ 3,522 30 $ 6,729

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing [Abstract]
Summary of Changes in Mortgage Servicing Rights	The following table summarizes the changes in mortgage servicing rights ("MSRs"), which are included in other assets on the consolidated balance sheets: Three months ended March 31 2018 2017 (in thousands) Amortized cost: Balance at beginning of period $ 37,663 $ 38,822 Originations of mortgage servicing rights 1,483 1,183 Amortization (1,398 ) (1,462 ) Balance at end of period $ 37,748 $ 38,543 Valuation allowance: Valuation Allowance - Balance at beginning and end of period $ — $ (1,291 ) Net MSRs at end of period $ 37,748 $ 37,252

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Compensation Expense and Related Tax Benefits	The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended March 31 2018 2017 (in thousands) Compensation expense $ 1,510 $ 734 Tax benefit (461 ) (744 ) Stock-based compensation expense, net of tax benefit $ 1,049 $ (10 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following: Three months ended March 31 2018 2017 (in thousands) Interest cost $ 17 $ 17 Net accretion and deferral (141 ) (141 ) Net periodic benefit $ (124 ) $ (124 ) The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended March 31 2018 2017 (in thousands) Interest cost $ 831 $ 830 Expected return on plan assets (451 ) (451 ) Net amortization and deferral 664 663 Net periodic pension cost $ 1,044 $ 1,042

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Notional Amounts and Fair Values of Derivative Financial Instruments	The following table presents a summary of the notional amounts and fair values of derivative financial instruments: March 31, 2018 December 31, 2017 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 142,131 $ 1,210 $ 129,469 $ 1,059 Negative fair values 10,572 (81 ) 8,957 (59 ) Net interest rate locks with customers 1,129 1,000 Forward Commitments Positive fair values 112,544 47 3,856 34 Negative fair values — — 100,808 (213 ) Net forward commitments 47 (179 ) Interest Rate Swaps with Customers Positive fair values 464,300 7,581 1,316,548 24,505 Negative fair values 1,654,770 (44,696 ) 716,634 (18,978 ) Net interest rate swaps with customers (37,115 ) 5,527 Interest Rate Swaps with Dealer Counterparties Positive fair values (1) (3) 1,654,770 39,466 716,634 18,941 Negative fair values (2) (3) 464,300 (6,475 ) 1,316,548 (19,764 ) Net interest rate swaps with dealer counterparties 32,991 (823 ) Foreign Exchange Contracts with Customers Positive fair values 9,914 228 4,852 276 Negative fair values 3,330 (64 ) 5,914 (119 ) Net foreign exchange contracts with customers 164 157 Foreign Exchange Contracts with Correspondent Banks Positive fair values 13,953 182 7,960 184 Negative fair values 8,682 (165 ) 6,048 (255 ) Net foreign exchange contracts with correspondent banks 17 (71 ) Net derivative fair value asset $ (2,767 ) $ 5,611 (1) Includes centrally cleared interest rate swaps with a notional amount of $371.1 million and a fair value of $0 as of March 31, 2018 and a notional amount of $24.4 million and a fair value of $0 as of December 31, 2017 . (2) Includes centrally cleared interest rate swaps with a notional amount of $83.3 million and a fair value of $0 as of March 31, 2018 and a notional amount of $377.1 million and a fair value of $0 as of December 31, 2017 . (3) The variation margin posted as collateral on centrally cleared interest rate swaps, which represents the fair value of such swaps, is legally characterized as settlements of the outstanding derivative contracts instead of cash collateral. Accordingly, the fair values of centrally cleared interest rate swaps were offset by variation margins of $4.3 million at March 31, 2018 , increasing the fair value of such swaps to $0 , and $4.6 million at December 31, 2017 , reducing the fair value of such swaps to $0 .
Summary of Fair Value Gains and Losses on Derivative Financial Instruments	The following table presents a summary of the fair value (losses) gains on derivative financial instruments: Three months ended March 31 2018 2017 (in thousands) Interest rate locks with customers $ 129 $ 845 Forward commitments 226 (2,379 ) Interest rate swaps with customers (42,642 ) (815 ) Interest rate swaps with dealer counterparties (1) 33,814 3,001 Foreign exchange contracts with customers 7 8 Foreign exchange contracts with correspondent banks 88 (37 ) Net fair value gains on derivative financial instruments $ (8,378 ) $ 623 (1) Not included is $8.9 million of gains representing the change in the variation margin for the three months ended March 31, 2018 and $2.2 million of losses representing the change in the variation margin for the three months ended March 31, 2017 .
Summary of Corporation's Mortgage Loans Held for Sale	The following table presents a summary of the Corporation’s mortgage loans held for sale: March 31, December 31, (in thousands) Cost (1) $ 23,186 $ 31,069 Fair value 23,450 31,530 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance.
Summary of Offsetting Derivative Assets	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2018 Interest rate swap derivative assets $ 47,047 $ (7,339 ) $ (34,170 ) $ 5,538 Foreign exchange derivative assets with correspondent banks 182 (165 ) — 17 Total $ 47,229 $ (7,504 ) $ (34,170 ) $ 5,555 Interest rate swap derivative liabilities $ 51,171 $ (7,339 ) $ (8,806 ) $ 35,026 Foreign exchange derivative liabilities with correspondent banks 165 (165 ) — — Total $ 51,336 $ (7,504 ) $ (8,806 ) $ 35,026 December 31, 2017 Interest rate swap derivative assets $ 43,446 $ (16,844 ) $ — $ 26,602 Foreign exchange derivative assets with correspondent banks 184 (184 ) — — Total $ 43,630 $ (17,028 ) $ — $ 26,602 Interest rate swap derivative liabilities $ 38,742 $ (16,844 ) $ (6,588 ) $ 15,310 Foreign exchange derivative liabilities with correspondent banks 255 (184 ) — 71 Total $ 38,997 $ (17,028 ) $ (6,588 ) $ 15,381 (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.
Summary of Offsetting Derivative Liabilities	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2018 Interest rate swap derivative assets $ 47,047 $ (7,339 ) $ (34,170 ) $ 5,538 Foreign exchange derivative assets with correspondent banks 182 (165 ) — 17 Total $ 47,229 $ (7,504 ) $ (34,170 ) $ 5,555 Interest rate swap derivative liabilities $ 51,171 $ (7,339 ) $ (8,806 ) $ 35,026 Foreign exchange derivative liabilities with correspondent banks 165 (165 ) — — Total $ 51,336 $ (7,504 ) $ (8,806 ) $ 35,026 December 31, 2017 Interest rate swap derivative assets $ 43,446 $ (16,844 ) $ — $ 26,602 Foreign exchange derivative assets with correspondent banks 184 (184 ) — — Total $ 43,630 $ (17,028 ) $ — $ 26,602 Interest rate swap derivative liabilities $ 38,742 $ (16,844 ) $ (6,588 ) $ 15,310 Foreign exchange derivative liabilities with correspondent banks 255 (184 ) — 71 Total $ 38,997 $ (17,028 ) $ (6,588 ) $ 15,381 (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Summary of Outstanding Commitments to Extend Credit and Letters of Credit	The outstanding amounts of commitments to extend credit and letters of credit were as follows: March 31, December 31, 2017 (in thousands) Commitments to extend credit $ 6,418,380 $ 6,205,029 Standby letters of credit 318,827 326,973 Commercial letters of credit 43,709 41,801

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present summaries of the Corporation’s assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 23,450 $ — $ 23,450 Available for sale investment securities: U.S. Government sponsored agency securities — 20,962 — 20,962 State and municipal securities — 406,099 — 406,099 Corporate debt securities — 97,995 3,960 101,955 Collateralized mortgage obligations — 679,700 — 679,700 Residential mortgage-backed securities — 1,054,166 — 1,054,166 Commercial mortgage-backed securities — 226,892 — 226,892 Auction rate securities — — 103,049 103,049 Total available for sale investment securities — 2,485,814 107,009 2,592,823 Other assets 19,505 48,304 — 67,809 Total assets $ 19,505 $ 2,557,568 $ 107,009 $ 2,684,082 Other liabilities $ 19,307 $ 51,251 $ — $ 70,558 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 31,530 $ — $ 31,530 Available for sale investment securities: Equity securities 918 — — 918 U.S. Government sponsored agency securities — 5,938 — 5,938 State and municipal securities — 408,949 — 408,949 Corporate debt securities — 93,552 3,757 97,309 Collateralized mortgage obligations — 602,623 — 602,623 Residential mortgage-backed securities — 1,120,796 — 1,120,796 Commercial mortgage-backed securities — 212,755 — 212,755 Auction rate securities — — 98,668 98,668 Total available for sale investment securities 918 2,444,613 102,425 2,547,956 Other assets 19,451 44,539 — 63,990 Total assets $ 20,369 $ 2,520,682 $ 102,425 $ 2,643,476 Other liabilities $ 19,357 $ 39,014 $ — $ 58,371
Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs	The following table presents the changes in the Corporation’s available for sale investment securities measured at fair value on a recurring basis using unobservable inputs (Level 3): Three months ended March 31, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at December 31, 2017 $ 707 $ 3,050 $ 98,668 Unrealized adjustment to fair value (1) 158 42 4,381 Discount accretion (2) — 3 — Balance at March 31, 2018 $ 865 $ 3,095 $ 103,049 Three months ended March 31, 2017 Balance at December 31, 2016 $ 422 $ 2,450 $ 97,256 Unrealized adjustment to fair value (1) — 297 86 Discount accretion (2) — 3 97 Balance at March 31, 2017 $ 422 $ 2,750 $ 97,439 (1) Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of "available for sale investment securities" on the consolidated balance sheets. (2) Included as a component of "net interest income" on the consolidated statements of income.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	The following table presents the Corporation’s Level 3 financial assets measured at fair value on a nonrecurring basis and reported on the Corporation’s consolidated balance sheets: March 31, 2018 December 31, 2017 (in thousands) Net loans $ 154,305 $ 149,608 OREO 10,744 9,823 MSRs 37,748 37,663 Total assets $ 202,797 $ 197,094
Details of Book Value and Fair Value of Financial Instruments	As required by FASB ASC Section 825-10-50, the following table details the book values and estimated fair values of the Corporation’s financial instruments as of March 31, 2018 and December 31, 2017 . In addition, a general description of the methods and assumptions used to estimate such fair values is also provided. March 31, 2018 Amortized Cost Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 100,151 $ 100,151 $ — $ — $ 100,151 Interest-bearing deposits with other banks 210,906 210,906 — — 210,906 Federal Reserve Bank and Federal Home Loan Bank stock 56,900 — 56,900 — 56,900 Loans held for sale 23,450 — 23,450 — 23,450 Available for sale investment securities 2,592,823 — 2,485,814 107,009 2,592,823 Net Loans 15,533,067 — — 14,933,445 14,933,445 Accrued interest receivable 53,060 53,060 — — 53,060 Other financial assets 216,952 120,156 48,304 48,492 216,952 FINANCIAL LIABILITIES Demand and savings deposits $ 12,763,521 $ 12,763,521 $ — $ — $ 12,763,521 Brokered deposits 64,195 64,195 — — 64,195 Time deposits 2,649,387 — 2,647,498 — 2,647,498 Short-term borrowings 937,852 937,852 — — 937,852 Accrued interest payable 9,681 9,681 — — 9,681 Other financial liabilities 209,483 158,232 51,251 — 209,483 Federal Home Loan Bank advances and long-term debt 938,499 — 914,763 — 914,763 December 31, 2017 Book Value Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 108,291 $ 108,291 $ — $ — $ 108,291 Interest-bearing deposits with other banks 293,805 293,805 — — 293,805 Federal Reserve Bank and Federal Home Loan Bank stock 60,761 — 60,761 — 60,761 Loans held for sale 31,530 — 31,530 — 31,530 Available for sale investment securities 2,547,956 918 2,444,613 102,425 2,547,956 Net Loans 15,598,337 — — 15,380,974 15,380,974 Accrued interest receivable 52,910 52,910 — — 52,910 Other financial assets 215,464 123,439 44,539 47,486 215,464 FINANCIAL LIABILITIES Demand and savings deposits $ 13,042,147 $ 13,042,147 $ — $ — $ 13,042,147 Brokered deposits 90,473 90,473 — — 90,473 Time deposits 2,664,912 — 2,664,912 — 2,664,912 Short-term borrowings 617,524 617,524 — — 617,524 Accrued interest payable 9,317 9,317 — — 9,317 Other financial liabilities 227,569 188,555 39,014 — 227,569 Federal Home Loan Bank advances and long-term debt 1,038,346 — 1,038,346 — 1,038,346

Basis of Presentation Narrative

Basis of Presentation Narrative (Details) - USD ($) $ in Thousands		Jan. 01, 2018	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects	[1]		$ 0
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects		$ 7,100
[1]	Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.

Net Income Per Share Reconcilia

Net Income Per Share Reconciliation of Weighted Average Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding (basic) (in shares)	175,303	174,150
Impact of common stock equivalents (in shares)	1,265	1,427
Weighted average shares outstanding (diluted) (in shares)	176,568	175,577

Accumulated Other Comprehensi33

Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Unrealized gain on securities, before tax amount	$ (34,991)	$ 6,575
Unrealized gain on securities, tax effect	7,347	(2,302)
Unrealized gain on securities, net of tax amount	(27,644)	4,273
Reclassification adjustment for securities gains included in net income, before tax amount	(19)	(1,106)
Reclassification adjustment for securities gains included in net income, tax effect	3	387
Reclassification adjustment for securities gains included in net income, net of tax amount	(16)	(719)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount	285
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect	(61)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount	(224)	0
Amortization of net unrecognized pension and postretirement items, before tax amount	430	528
Amortization of net unrecognized pension and postretirement items, tax effect	(91)	(185)
Amortization of net unrecognized pension and postretirement items, net of tax amount	339	343
Total Other Comprehensive Income, Before Tax Amount	(34,295)	5,997
Total Other Comprehensive Income, Tax Effect	7,198	(2,100)
Other Comprehensive (Loss) Income	$ (27,097)	$ 3,897

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		$ (32,974)
Reclassification of stranded tax effects	[1]	0
Ending Balance		(67,172)
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(18,509)	$ (23,047)
Other comprehensive loss before reclassifications		(27,644)	4,273
Amounts reclassified from accumulated other comprehensive income (loss)		(16)	(719)
Reclassification of stranded tax effects		(3,887)
Ending Balance		(50,056)	(19,493)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		458	273
Other comprehensive loss before reclassifications		224	0
Amounts reclassified from accumulated other comprehensive income (loss)		0	0
Reclassification of stranded tax effects		0
Ending Balance		682	273
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(14,923)	(15,675)
Other comprehensive loss before reclassifications		0	0
Amounts reclassified from accumulated other comprehensive income (loss)		339	343
Reclassification of stranded tax effects		(3,214)
Ending Balance		(17,798)	(15,332)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(32,974)	(38,449)
Other comprehensive loss before reclassifications		(27,420)	4,273
Amounts reclassified from accumulated other comprehensive income (loss)		323	(376)
Reclassification of stranded tax effects	[1]	(7,101)
Ending Balance		$ (67,172)	$ (34,552)
[1]	Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.

Investment Securities Schedule

Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 1,800,000	$ 0
Amortized Cost	2,655,314	2,575,719
Gross Unrealized Gains	8,026	13,062
Gross Unrealized Losses	(70,517)	(40,825)
Estimated Fair Value	2,592,823	2,547,956
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	21,105	5,962
Gross Unrealized Gains	40	2
Gross Unrealized Losses	(183)	(26)
Estimated Fair Value	20,962	5,938
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	413,632	405,860
Gross Unrealized Gains	2,247	5,638
Gross Unrealized Losses	(9,780)	(2,549)
Estimated Fair Value	406,099	408,949
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	101,367	96,353
Gross Unrealized Gains	2,482	2,832
Gross Unrealized Losses	(1,894)	(1,876)
Estimated Fair Value	101,955	97,309
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	695,840	611,927
Gross Unrealized Gains	236	491
Gross Unrealized Losses	(16,376)	(9,795)
Estimated Fair Value	679,700	602,623
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,084,582	1,132,080
Gross Unrealized Gains	3,006	3,957
Gross Unrealized Losses	(33,422)	(15,241)
Estimated Fair Value	1,054,166	1,120,796
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	231,378	215,351
Gross Unrealized Gains	15	0
Gross Unrealized Losses	(4,501)	(2,596)
Estimated Fair Value	226,892	212,755
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	107,410	107,410
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,361)	(8,742)
Estimated Fair Value	103,049	98,668
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,574,943
Gross Unrealized Gains		12,920
Gross Unrealized Losses		(40,825)
Estimated Fair Value		2,547,038
Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		776
Gross Unrealized Gains		142
Gross Unrealized Losses		0
Estimated Fair Value		$ 918
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 11,500		$ 11,500

Investment Securities Schedul36

Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) $ in Thousands	Mar. 31, 2018USD ($)
Amortized Cost
Due in one year or less	$ 14,055
Due from one year to five years	36,871
Due from five years to ten years	119,069
Due after ten years	473,519
Amortized cost, before securities without debt maturities	643,514
Amortized Cost	2,655,314
Estimated Fair Value
Due in one year or less	14,063
Due from one year to five years	36,986
Due from five years to ten years	119,529
Due after ten years	461,487
Available for sale securities, debt maturities, before securities without single maturities	632,065
Estimated Fair Value	2,592,823
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	695,840
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	679,700
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	231,378
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	226,892
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	1,084,582
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	$ 1,054,166

Investment Securities Summary o

Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	$ 19	$ 1,106
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	9	1,045
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	$ 10	$ 61

Investment Securities Gross Unr

Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 12,499	$ 5,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(183)	(26)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,499	5,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(183)	(26)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	163,345	11,650
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,132)	(50)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	114,024	118,297
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(6,648)	(2,499)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	277,369	129,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(9,780)	(2,549)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,466	4,544
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(130)	(48)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	28,219	32,163
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,764)	(1,828)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	37,685	36,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,894)	(1,876)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	456,200	303,932
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7,184)	(2,408)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	176,076	187,690
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9,192)	(7,387)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	632,276	491,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(16,376)	(9,795)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	527,502	511,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(13,611)	(4,348)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	471,703	500,375
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(19,811)	(10,893)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	999,205	1,011,753
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(33,422)	(15,241)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	196,887	190,985
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,884)	(2,118)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	21,539	21,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(617)	(478)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	218,426	212,755
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(4,501)	(2,596)
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	103,049	98,668
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,361)	(8,742)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	103,049	98,668
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(4,361)	(8,742)
Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,365,899	1,028,319
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(28,124)	(8,998)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	914,610	958,963
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(42,393)	(31,827)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,280,509	1,987,282
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (70,517)	$ (40,825)

Investment Securities Summary39

Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,655,314
Corporate debt securities	2,592,823
Corporate Debt Securities Issued by Financial Institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97,392	$ 92,379
Corporate debt securities	97,980	93,335
Single-issuer Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,352	31,335
Corporate debt securities	30,513	30,703
Subordinated Debt
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,011	49,013
Corporate debt securities	54,357	49,533
Senior Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,029	12,031
Corporate debt securities	12,245	12,392
Pooled Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	0
Corporate debt securities	865	707
Other Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,975	3,974
Corporate debt securities	3,975	3,974
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	101,367	96,353
Corporate debt securities	$ 101,955	$ 97,309

Investment Securities Narrative

Investment Securities Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)security	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 1,800,000	$ 0
Amortized cost	2,655,314	2,575,719
Available-for-sale Securities, Fair Value Disclosure	2,592,823	2,547,956
Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		776
Available-for-sale Securities, Fair Value Disclosure		$ 918
Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Unrealized Loss on Securities	$ 839
Number of Trust Preferred Securities | security	17
External Credit Rating, BBB [Member] | Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	$ 3,800
Available-for-sale Securities, Fair Value Disclosure	$ 3,100
Not Rated By An External Agency [Member] | Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Number of Trust Preferred Securities | security	2
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	$ 4,900
Available-for-sale Securities, Fair Value Disclosure	$ 4,700
Number of Trust Preferred Securities | security	4
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 11,500		$ 11,500

Loans and Allowance for Credi41

Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	$ 15,724,738	$ 15,795,918
Deferred Revenue	28,454	27,671
Loans, net of unearned income	15,696,284	15,768,247	$ 14,963,177
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	6,332,508	6,364,804
Loans, net of unearned income	6,332,508	6,364,804	6,118,533
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	4,299,072	4,300,297
Loans, net of unearned income	4,299,072	4,300,297	4,167,809
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	1,514,241	1,559,719
Loans, net of unearned income	1,514,241	1,559,719	1,595,901
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	1,976,524	1,954,711
Loans, net of unearned income	1,976,524	1,954,711	1,665,142
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	976,131	1,006,935
Loans, net of unearned income	976,131	1,006,935	882,983
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	326,766	313,783
Loans, net of unearned income	326,766	313,783	$ 288,826
Leasing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	297,465	291,556
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	$ 2,031	$ 4,113

Loans and Allowance for Credi42

Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Allowance for loan losses	$ 163,217	$ 169,910	$ 170,076	$ 168,679
Reserve for unfunded lending commitments	12,802	6,174
Allowance for credit losses	$ 176,019	$ 176,084	$ 172,647	$ 171,325

Loans and Allowance for Credi43

Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 176,084	$ 171,325
Loans charged off	(6,397)	(9,407)
Recoveries of loans previously charged off	2,362	5,929
Net loans charged off	(4,035)	(3,478)
Provision for credit losses	3,970	4,800
Balance at end of period	$ 176,019	$ 172,647

Loans and Allowance for Credi44

Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 169,910	$ 168,679
Loans charged off	(6,397)	(9,407)
Recoveries of loans previously charged off	2,362	5,929
Net loans charged off	(4,035)	(3,478)
Provision for loan losses	(2,658)	4,875
Ending Balance	163,217	170,076
Provision for loan losses gross	6,600	75
Provision for credit losses	3,970	4,800
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	58,793	46,842
Loans charged off	(267)	(1,224)
Recoveries of loans previously charged off	279	450
Net loans charged off	12	(774)
Provision for loan losses	(88)	1,305
Ending Balance	58,717	47,373
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	66,280	54,353
Loans charged off	(4,005)	(5,527)
Recoveries of loans previously charged off	1,075	4,191
Net loans charged off	(2,930)	(1,336)
Provision for loan losses	(1,520)	2,292
Ending Balance	61,830	55,309
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	18,127	26,801
Loans charged off	(408)	(698)
Recoveries of loans previously charged off	206	137
Net loans charged off	(202)	(561)
Provision for loan losses	(397)	(2,419)
Ending Balance	17,528	23,821
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	16,088	22,929
Loans charged off	(162)	(216)
Recoveries of loans previously charged off	107	230
Net loans charged off	(55)	14
Provision for loan losses	(772)	(925)
Ending Balance	15,261	22,018
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	6,620	6,455
Loans charged off	(158)	(247)
Recoveries of loans previously charged off	306	548
Net loans charged off	148	301
Provision for loan losses	(844)	745
Ending Balance	5,924	7,501
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	2,045	3,574
Loans charged off	(892)	(856)
Recoveries of loans previously charged off	179	236
Net loans charged off	(713)	(620)
Provision for loan losses	571	77
Ending Balance	1,903	3,031
Leasing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	1,957	3,192
Loans charged off	(505)	(639)
Recoveries of loans previously charged off	210	137
Net loans charged off	(295)	(502)
Provision for loan losses	392	578
Ending Balance	2,054	3,268
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	0	4,533
Loans charged off	0	0
Recoveries of loans previously charged off	0	0
Net loans charged off	0	0
Provision for loan losses	0	3,222
Ending Balance	$ 0	$ 7,755

Loans and Allowance for Credi45

Loans and Allowance for Credit Losses Present Loans, Net of Unearned Income and Their Related Allowance for Loan Losses, by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	$ 122,942		$ 124,882
Loans individually evaluated for impairment	40,275		45,194
Allowance for loan losses	163,217	$ 169,910	170,076	$ 168,679
Loans collectively evaluated for impairment	15,501,704		14,786,290
Loans individually evaluated for impairment	194,580		176,887
Loans, net of unearned income	15,696,284	15,768,247	14,963,177
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	50,392		37,457
Loans individually evaluated for impairment	8,325		9,916
Allowance for loan losses	58,717	58,793	47,373	46,842
Loans collectively evaluated for impairment	6,279,144		6,067,492
Loans individually evaluated for impairment	53,364		51,041
Loans, net of unearned income	6,332,508	6,364,804	6,118,533
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	51,314		43,155
Loans individually evaluated for impairment	10,516		12,154
Allowance for loan losses	61,830	66,280	55,309	54,353
Loans collectively evaluated for impairment	4,234,362		4,119,550
Loans individually evaluated for impairment	64,710		48,259
Loans, net of unearned income	4,299,072	4,300,297	4,167,809
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	6,440		14,744
Loans individually evaluated for impairment	11,088		9,077
Allowance for loan losses	17,528	18,127	23,821	26,801
Loans collectively evaluated for impairment	1,489,429		1,576,949
Loans individually evaluated for impairment	24,812		18,952
Loans, net of unearned income	1,514,241	1,559,719	1,595,901
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	5,610		10,581
Loans individually evaluated for impairment	9,651		11,437
Allowance for loan losses	15,261	16,088	22,018	22,929
Loans collectively evaluated for impairment	1,935,587		1,620,302
Loans individually evaluated for impairment	40,937		44,840
Loans, net of unearned income	1,976,524	1,954,711	1,665,142
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	5,245		4,915
Loans individually evaluated for impairment	679		2,586
Allowance for loan losses	5,924	6,620	7,501	6,455
Loans collectively evaluated for impairment	965,398		869,225
Loans individually evaluated for impairment	10,733		13,758
Loans, net of unearned income	976,131	1,006,935	882,983
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	1,887		3,007
Loans individually evaluated for impairment	16		24
Allowance for loan losses	1,903	2,045	3,031	3,574
Loans collectively evaluated for impairment	326,742		288,789
Loans individually evaluated for impairment	24		37
Loans, net of unearned income	326,766	313,783	288,826
Leasing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	2,054		3,268
Loans individually evaluated for impairment	0		0
Allowance for loan losses	2,054	1,957	3,268	3,192
Loans collectively evaluated for impairment	271,042		243,983
Loans individually evaluated for impairment	0		0
Loans, net of unearned income	271,042	267,998	243,983
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment			7,755
Allowance for loan losses	$ 0	$ 0	$ 7,755	$ 4,533

Loans and Allowance for Credi46

Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Impaired Financing Receivables [Line Items]
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 52	$ 8,600
Unpaid principal balance, with no related allowance	93,425	88,716
Unpaid principal balance, with related allowance	139,073	141,739
Unpaid Principal Balance	232,498	230,455
Recorded investment, with no related allowance	80,733	75,111
Recorded investment, with related allowance	113,847	116,018
Recorded Investment	194,580	191,129
Related Allowance	40,275	41,521
Real-estate - commercial mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	29,862	26,728
Unpaid principal balance, with related allowance	32,863	33,710
Recorded investment, with no related allowance	27,819	22,886
Recorded investment, with related allowance	25,545	25,895
Related Allowance	8,325	8,112
Commercial
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	46,673	44,936
Unpaid principal balance, with related allowance	29,723	29,816
Recorded investment, with no related allowance	40,525	39,550
Recorded investment, with related allowance	24,185	24,175
Related Allowance	10,516	11,406
Real estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	4,547	4,575
Unpaid principal balance, with related allowance	41,889	42,597
Recorded investment, with no related allowance	4,547	4,575
Recorded investment, with related allowance	36,390	37,132
Related Allowance	9,651	9,895
Construction
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	12,343	12,477
Unpaid principal balance, with related allowance	6,186	7,308
Recorded investment, with no related allowance	7,842	8,100
Recorded investment, with related allowance	2,891	4,097
Related Allowance	679	967
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	28,387	28,282
Recorded investment, with related allowance	24,812	24,693
Related Allowance	11,088	11,124
Consumer
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	25	26
Recorded investment, with related allowance	24	26
Related Allowance	$ 16	$ 17

Loans and Allowance for Credi47

Loans and Allowance for Credit Losses Average Impaired Loans by Class Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 77,923	$ 59,135
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	183	134
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	114,934	119,939
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	533	445
Impaired Financing Receivable, Average Recorded Investment	192,857	179,074
Impaired Financing Receivable, Interest Income, Accrual Method	716	579
Real-estate - commercial mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	25,353	23,842
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	83	70
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25,720	29,126
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	84	85
Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	40,038	25,574
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	73	36
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,181	23,044
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	44	32
Real-estate - home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,752	19,079
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	184	95
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,561	4,673
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	27	26
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	36,761	40,839
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	221	230
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,971	5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,495	7,100
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	3
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25	38
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Leasing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	713
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	$ 0

Loans and Allowance for Credi48

Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 15,724,738	$ 15,795,918
Real-estate - commercial mortgage
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	6,332,508	6,364,804
Real-estate - commercial mortgage | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	6,027,210	6,066,396
Real-estate - commercial mortgage | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	144,809	147,604
Real-estate - commercial mortgage | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	160,489	150,804
Commercial
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,154,213	4,132,440
Commercial | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,873,737	3,831,485
Commercial | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	100,242	121,842
Commercial | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	180,234	179,113
Commercial - unsecured
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	144,859	167,857
Commercial - unsecured | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	139,139	159,620
Commercial - unsecured | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,378	5,478
Commercial - unsecured | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	2,342	2,759
Commercial - industrial, financial and agricultural
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,299,072	4,300,297
Commercial - industrial, financial and agricultural | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,012,876	3,991,105
Commercial - industrial, financial and agricultural | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	103,620	127,320
Commercial - industrial, financial and agricultural | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	182,576	181,872
Construction
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	158,482	163,102
Construction | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	141,587	143,759
Construction | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,613	5,259
Construction | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	12,282	14,084
Construction - commercial
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	748,796	765,816
Construction - commercial | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	744,274	761,218
Construction - commercial | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	834	846
Construction - commercial | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,688	3,752
Construction - Commercial and Commercial Residential
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	907,278	928,918
Construction - Commercial and Commercial Residential | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	885,861	904,977
Construction - Commercial and Commercial Residential | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	5,447	6,105
Construction - Commercial and Commercial Residential | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	15,970	17,836
Commercial Loans, Commerical Mortgages, Constructions Loans
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 11,538,858	$ 11,594,019
Percentage of total loans rated	100.00%	100.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 10,925,947	$ 10,962,478
Percentage of total loans rated	94.70%	94.60%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 253,876	$ 281,029
Percentage of total loans rated	2.20%	2.40%
Commercial Loans, Commerical Mortgages, Constructions Loans | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 359,035	$ 350,512
Percentage of total loans rated	3.10%	3.00%

Loans and Allowance for Credi49

Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)day	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	$ 15,696,284	$ 15,768,247	$ 14,963,177
Delinquent | Minimum
Financing Receivable, Impaired [Line Items]
Days past due | day	30
Delinquent | Maximum
Financing Receivable, Impaired [Line Items]
Days past due | day	89
Non-performing
Financing Receivable, Impaired [Line Items]
Days past due | day	90
Real-estate - home equity
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	$ 1,514,241	1,559,719	1,595,901
Real-estate - home equity | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	1,493,485	1,535,557
Real-estate - home equity | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	8,731	12,655
Real-estate - home equity | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	12,025	11,507
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	1,976,524	1,954,711	1,665,142
Real estate - residential mortgage | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	1,938,817	1,914,888
Real estate - residential mortgage | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	17,539	18,852
Real estate - residential mortgage | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	20,168	20,971
Construction - other
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	68,853	78,017
Construction - other | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	68,363	77,403
Construction - other | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	0	203
Construction - other | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	490	411
Consumer
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	56,058	55,213
Consumer | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	55,681	54,828
Consumer | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	323	315
Consumer | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	54	70
Consumer - indirect
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	270,708	258,570
Consumer - indirect | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	267,584	254,663
Consumer - indirect | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	2,931	3,681
Consumer - indirect | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	193	226
Consumer
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	326,766	313,783	288,826
Consumer | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	323,265	309,491
Consumer | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	3,254	3,996
Consumer | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	247	296
Leasing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	271,042	267,998	$ 243,983
Leasing, other and overdrafts | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	270,027	267,111
Leasing, other and overdrafts | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	843	855
Leasing, other and overdrafts | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	172	32
Real Estate, Consumer, Leasing And Other Loans [Member] [Member]
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	4,157,426	4,174,228
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	4,093,957	4,104,450
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	30,367	36,561
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	$ 33,102	$ 33,217
Commercial Loans, Commerical Mortgages, Constructions Loans
Financing Receivable, Impaired [Line Items]
% of Total	100.00%	100.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Performing
Financing Receivable, Impaired [Line Items]
% of Total	98.50%	98.30%
Commercial Loans, Commerical Mortgages, Constructions Loans | Delinquent
Financing Receivable, Impaired [Line Items]
% of Total	0.70%	0.90%
Commercial Loans, Commerical Mortgages, Constructions Loans | Non-performing
Financing Receivable, Impaired [Line Items]
% of Total	0.80%	0.80%

Loans and Allowance for Credi50

Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Non-accrual loans	$ 122,966	$ 124,749
Loans 90 days or more past due and still accruing	11,676	10,010
Total non-performing loans	134,642	134,759
Other real estate owned (OREO)	10,744	9,823
Total non-performing assets	$ 145,386	$ 144,582

Loans and Allowance for Credi51

Loans and Allowance for Credit Losses Past Due Loan Status and Non-Accrual Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 186,334	$ 196,268
≥ 90 Days Past Due and Accruing	11,676	10,010
Non- accrual	122,966	124,749
Current	15,509,950	15,571,979
Loans, net of unearned income	15,696,284	15,768,247	$ 14,963,177
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38,720	40,709
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,972	20,800
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	134,642	134,759
Real-estate - commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	48,881	49,126
≥ 90 Days Past Due and Accruing	1,001	625
Non- accrual	35,183	34,822
Current	6,283,627	6,315,678
Loans, net of unearned income	6,332,508	6,364,804	6,118,533
Real-estate - commercial mortgage | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,606	9,456
Real-estate - commercial mortgage | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,091	4,223
Real-estate - commercial mortgage | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	36,184	35,447
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	61,926	63,647
≥ 90 Days Past Due and Accruing	1,935	1,360
Non- accrual	52,336	52,255
Current	4,092,287	4,068,793
Loans, net of unearned income	4,154,213	4,132,440
Commercial | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,048	4,778
Commercial | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,607	5,254
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	54,271	53,615
Commercial - unsecured
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,617	1,009
≥ 90 Days Past Due and Accruing	10	45
Non- accrual	634	649
Current	143,242	166,848
Loans, net of unearned income	144,859	167,857
Commercial - unsecured | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	814	305
Commercial - unsecured | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	159	10
Commercial - unsecured | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	644	694
Commercial - industrial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	63,543	64,656
≥ 90 Days Past Due and Accruing	1,945	1,405
Non- accrual	52,970	52,904
Current	4,235,529	4,235,641
Loans, net of unearned income	4,299,072	4,300,297	4,167,809
Commercial - industrial, financial and agricultural | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,862	5,083
Commercial - industrial, financial and agricultural | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,766	5,264
Commercial - industrial, financial and agricultural | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	54,915	54,309
Real-estate - home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,756	24,162
≥ 90 Days Past Due and Accruing	3,280	2,372
Non- accrual	8,745	9,135
Current	1,493,485	1,535,557
Loans, net of unearned income	1,514,241	1,559,719	1,595,901
Real-estate - home equity | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,401	9,640
Real-estate - home equity | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,330	3,015
Real-estate - home equity | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,025	11,507
Real estate - residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	37,707	39,823
≥ 90 Days Past Due and Accruing	4,833	5,280
Non- accrual	15,335	15,691
Current	1,938,817	1,914,888
Loans, net of unearned income	1,976,524	1,954,711	1,665,142
Real estate - residential mortgage | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,725	11,961
Real estate - residential mortgage | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,814	6,891
Real estate - residential mortgage | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,168	20,971
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,422	12,206
≥ 90 Days Past Due and Accruing	0	0
Non- accrual	10,422	11,767
Current	148,060	150,896
Loans, net of unearned income	158,482	163,102
Construction | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	439
Construction | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,422	11,767
Construction - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19	502
≥ 90 Days Past Due and Accruing	0	0
Non- accrual	19	19
Current	748,777	765,314
Loans, net of unearned income	748,796	765,816
Construction - commercial | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	483
Construction - commercial | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction - commercial | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19	19
Construction - other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	490	614
≥ 90 Days Past Due and Accruing	198	0
Non- accrual	292	411
Current	68,363	77,403
Loans, net of unearned income	68,853	78,017
Construction - other | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	203
Construction - other | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction - other | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	490	411
Real-estate - construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,931	13,322
≥ 90 Days Past Due and Accruing	198	0
Non- accrual	10,733	12,197
Current	965,200	993,613
Loans, net of unearned income	976,131	1,006,935	882,983
Real-estate - construction | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	686
Real-estate - construction | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	439
Real-estate - construction | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,931	12,197
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	377	385
≥ 90 Days Past Due and Accruing	54	70
Non- accrual	0	0
Current	55,681	54,828
Loans, net of unearned income	56,058	55,213
Consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	211	260
Consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112	55
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	54	70
Consumer - indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,124	3,907
≥ 90 Days Past Due and Accruing	193	226
Non- accrual	0	0
Current	267,584	254,663
Loans, net of unearned income	270,708	258,570
Consumer - indirect | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,253	3,055
Consumer - indirect | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	678	626
Consumer - indirect | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	193	226
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,501	4,292
≥ 90 Days Past Due and Accruing	247	296
Non- accrual	0	0
Current	323,265	309,491
Loans, net of unearned income	326,766	313,783	288,826
Consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,464	3,315
Consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	790	681
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	247	296
Leasing, other and overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,015	887
≥ 90 Days Past Due and Accruing	172	32
Non- accrual	0	0
Current	270,027	267,111
Loans, net of unearned income	271,042	267,998	$ 243,983
Leasing, other and overdrafts | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	662	568
Leasing, other and overdrafts | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	181	287
Leasing, other and overdrafts | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 172	$ 32

Loans and Allowance for Credi52

Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	$ 71,614	$ 66,379
Non-accrual TDRs (1)	24,897	29,051
Total TDRs	96,511	95,430
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	25,602	26,016
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	18,181	13,959
Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	16,067	15,558
Commercial
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	11,740	10,820
Consumer
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	$ 24	$ 26

Loans and Allowance for Credi53

Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)loans	Mar. 31, 2017USD ($)loans
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	29	31
Post-Modification Recorded Investment | $	$ 10,748	$ 5,696
Extend maturity without rate concession | Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	9	4
Post-Modification Recorded Investment | $	$ 9,359	$ 3,126
Extend maturity without rate concession | Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	1
Post-Modification Recorded Investment | $	$ 0	$ 318
Extend maturity without rate concession | Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	17	16
Post-Modification Recorded Investment | $	$ 1,276	$ 1,284
Extend maturity without rate concession | Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	2
Post-Modification Recorded Investment | $	$ 0	$ 337
Bankruptcy | Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	2	7
Post-Modification Recorded Investment | $	$ 108	$ 453
Bankruptcy | Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	1	1
Post-Modification Recorded Investment | $	$ 5	$ 178

Loans and Allowance for Credi54

Loans and Allowance for Credit Losses TDRs by Class Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)loans	Mar. 31, 2017USD ($)loans
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Investment	$ 10,748	$ 5,696
Number of Loans | loans	29	31
Number of Loans | loans	32	30
Recorded Investment	$ 3,522	$ 6,729
Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	5	8
Recorded Investment	$ 332	$ 2,006
Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans	1	2
Recorded Investment	$ 180	$ 430
Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	18	14
Recorded Investment	$ 1,000	$ 639
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	6	6
Recorded Investment	$ 526	$ 3,654
Construction - other
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	2	0
Recorded Investment	$ 1,484	$ 0

Loans and Allowance for Credi55

Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	$ 3,970	$ 4,800
Impaired loans with principal balances approximately in percentage	72.00%	67.00%
Loan to value ratio in the Corporation's policy	70.00%
Recorded investment, with no related allowance	$ 80,733		$ 75,111
Loans and Leases Receivable, Impaired, Commitment to Lend	52		$ 8,600
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment	1,000
Impaired loans balances, real estate as collateral	1,000
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment	$ 1,000

Mortgage Servicing Rights Summa

Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Amortized Cost:
Balance at beginning of period	$ 37,663	$ 38,822
Originations of mortgage servicing rights	1,483	1,183
Amortization	(1,398)	(1,462)
Balance at end of period	37,748	38,543
Valuation allowance:
Valuation Allowance - Balance at beginning and end of period	0	(1,291)
Net MSRs at end of period	$ 37,748	$ 37,252

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Residential Mortgage [Member]
Servicing Asset at Amortized Cost [Line Items]
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 0	$ 1,291

Stock-Based Compensation Compen

Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation expense	$ 1,510	$ 734
Tax benefit	(461)	(744)
Stock-based compensation expense, net of tax benefit	$ 1,049	$ (10)

Stock-Based Compensation Narrat

Stock-Based Compensation Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement [Line Items]
Compensation expense	$ 1,510	$ 734
Stock-based compensation expense, net of tax benefit	$ 1,049	$ (10)
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	360
Employee Equity Plan [Member]
Statement [Line Items]
Awards vesting period (in years)	3 years
Shares reserved for future grants under the stock option and compensation plan	11,100

Employee Benefit Plans Summary

Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 831	$ 830
Expected return on plan assets	(451)	(451)
Net amortization and deferral	664	663
Net periodic benefit	1,044	1,042
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	17	17
Net accretion and deferral	(141)	(141)
Net periodic benefit	$ (124)	$ (124)

Derivative Financial Instrume61

Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Assets	$ 19,948,941		$ 20,036,905
Foreign currency open position	500
Mortgage Loans Held For Sale [Member]
Derivative [Line Items]
Gain (loss) in fair values of mortgage loans held for sale	$ (197)	$ 539
Fulton Bank Subsidiary [Member]
Derivative [Line Items]
Assets				$ 10,000,000

Derivative Financial Instrume62

Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative asset, fair value	$ (47,229,000)	$ (43,630,000)
Derivative liability, fair value	(51,336,000)	(38,997,000)
Derivative asset (liability), net	(2,767,000)	5,611,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	142,131,000	129,469,000
Derivative liability, notional amount	10,572,000	8,957,000
Derivative asset, fair value	(1,210,000)	(1,059,000)
Derivative liability, fair value	(81,000)	(59,000)
Derivative asset (liability), net	1,129,000	1,000,000
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	112,544,000	3,856,000
Derivative liability, notional amount	0	100,808,000
Derivative asset, fair value	(47,000)	(34,000)
Derivative liability, fair value	0	(213,000)
Derivative asset (liability), net	47,000	(179,000)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	464,300,000	1,316,548,000
Derivative liability, notional amount	1,654,770,000	716,634,000
Derivative asset, fair value	(7,581,000)	(24,505,000)
Derivative liability, fair value	(44,696,000)	(18,978,000)
Derivative asset (liability), net	(37,115,000)	5,527,000
Interest Rate Swap With Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	1,654,770,000	716,634,000
Derivative liability, notional amount	464,300,000	1,316,548,000
Derivative asset, fair value	(39,466,000)	(18,941,000)
Derivative liability, fair value	(6,475,000)	(19,764,000)
Derivative asset (liability), net	32,991,000	(823,000)
Centrally Cleared Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative liability, fair value	0	0
Derivative Asset, Collateral, Obligation to Return Cash, Offset	4,300,000
Derivatives variation margin		4,600,000
Centrally Cleared Interest Rate Swap with Counterparty [Member] | Positive Fair Values [Member]
Derivative [Line Items]
Derivative asset, notional amount	371,100,000	24,400,000
Derivative asset, fair value	0	0
Centrally Cleared Interest Rate Swap with Counterparty [Member] | Negative Fair Values [Member]
Derivative [Line Items]
Derivative liability, notional amount	83,300,000	377,100,000
Derivative liability, fair value	0	0
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	9,914,000	4,852,000
Derivative liability, notional amount	3,330,000	5,914,000
Derivative asset, fair value	(228,000)	(276,000)
Derivative liability, fair value	(64,000)	(119,000)
Derivative asset (liability), net	164,000	157,000
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	13,953,000	7,960,000
Derivative liability, notional amount	8,682,000	6,048,000
Derivative asset, fair value	(182,000)	(184,000)
Derivative liability, fair value	(165,000)	(255,000)
Derivative asset (liability), net	$ 17,000	$ (71,000)

Derivative Financial Instrume63

Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ (8,378)	$ 623
Interest rate lock with customers [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	129	845
Forward Commitments [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	226	(2,379)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	(42,642)	(815)
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	33,814	3,001
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	7	8
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	88	(37)
Centrally Cleared Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 8,900	$ 2,200

Derivative Financial Instrume64

Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	$ 23,450		$ 31,530
Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(197)	$ 539
Cost [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	23,186		31,069
Fair value [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	$ 23,450		$ 31,530

Derivative Financial Instrume65

Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 47,229	$ 43,630
Derivative, Collateral, Obligation to Return Securities	7,504	17,028
Derivative, Collateral, Obligation to Return Cash	(34,170)	0
Net Amount	5,555	26,602
Derivative liability, gross liability	51,336	38,997
Derivative liability, Collateral, Right to Reclaim Securities	(7,504)	(17,028)
Derivative liability, Collateral, Right to Reclaim Cash	(8,806)	(6,588)
Derivative liability, Net Amount	35,026	15,381
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	47,047	43,446
Derivative, Collateral, Obligation to Return Securities	7,339	16,844
Derivative, Collateral, Obligation to Return Cash	(34,170)	0
Net Amount	5,538	26,602
Derivative liability, gross liability	51,171	38,742
Derivative liability, Collateral, Right to Reclaim Securities	(7,339)	(16,844)
Derivative liability, Collateral, Right to Reclaim Cash	(8,806)	(6,588)
Derivative liability, Net Amount	35,026	15,310
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	182	184
Derivative, Collateral, Obligation to Return Securities	165	184
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	17	0
Derivative liability, gross liability	165	255
Derivative liability, Collateral, Right to Reclaim Securities	(165)	(184)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 0	$ 71

Commitments and Contingencies O

Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - Reserve for Off-balance Sheet Activities [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 6,418,380	$ 6,205,029
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	318,827	326,973
Commercial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 43,709	$ 41,801

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Residential mortgage principal balance repurchase request received	$ 543	$ 543
Residential mortgage principal balance FHLB credit enhancement	80,000
Residential mortgage repurchase reserves FHLB credit enhancement	1,100	1,200
Sale of non-prime loans	44,900
Unpaid principal balance	58,400
Reserve for Off-balance Sheet Activities [Member] | Residential Mortgage [Member]
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance	$ 2,100	$ 2,100

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,592,823
Available-for-sale Securities, Fair Value Disclosure	2,592,823	$ 2,547,956
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	23,450	31,530
Available-for-sale Securities, Fair Value Disclosure	2,592,823	2,547,956
Other Assets, Fair Value Disclosure	67,809	63,990
Assets, Fair Value Disclosure	2,684,082	2,643,476
Liabilities, Fair Value Disclosure	70,558	58,371
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	865	707
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		918
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		918
U.S. Government-Sponsored Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	20,962	5,938
U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	20,962	5,938
State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	406,099	408,949
State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	406,099	408,949
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	101,955	97,309
Available-for-sale Securities, Fair Value Disclosure	101,955	97,309
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	101,955	97,309
Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	679,700	602,623
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	679,700	602,623
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,054,166	1,120,796
Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,054,166	1,120,796
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	226,892	212,755
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	226,892	212,755
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	103,049	98,668
Auction Rate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	103,049	98,668
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure	0	918
Other Assets, Fair Value Disclosure	19,505	19,451
Assets, Fair Value Disclosure	19,505	20,369
Liabilities, Fair Value Disclosure	19,307	19,357
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		918
Fair Value, Inputs, Level 1 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	23,450	31,530
Available-for-sale Securities, Fair Value Disclosure	2,485,814	2,444,613
Other Assets, Fair Value Disclosure	48,304	44,539
Assets, Fair Value Disclosure	2,557,568	2,520,682
Liabilities, Fair Value Disclosure	51,251	39,014
Fair Value, Inputs, Level 2 [Member] | Other Corporate Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	4,000	4,000
Fair Value, Inputs, Level 2 [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	66,600	61,900
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 2 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	20,962	5,938
Fair Value, Inputs, Level 2 [Member] | State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	406,099	408,949
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	97,995	93,552
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	679,700	602,623
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,054,166	1,120,796
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	226,892	212,755
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure	107,009	102,425
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	107,009	102,425
Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Pooled Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	865	707
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | U.S. Government-Sponsored Agency Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	3,960	3,757
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 103,049	$ 98,668

Fair Value Measurements Changes

Fair Value Measurements Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 707	$ 422
Unrealized adjustment to fair value	158	0
(Premium amortization) discount accretion	0	0
Balance, end of period	865	422
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3,050	2,450
Unrealized adjustment to fair value	42	297
(Premium amortization) discount accretion	3	3
Balance, end of period	3,095	2,750
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	98,668	97,256
Unrealized adjustment to fair value	4,381	86
(Premium amortization) discount accretion	0	97
Balance, end of period	$ 103,049	$ 97,439

Fair Value Measurements Asset70

Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 10,744	$ 9,823
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans	154,305	149,608
OREO	10,744	9,823
MSRs	37,748	37,663
Assets, Fair Value Disclosure	$ 202,797	$ 197,094

Fair Value Measurements Details

Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Available for sale investment securities	$ 2,592,823,000	$ 2,547,956,000
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	100,151,000	108,291,000
Interest-bearing deposits with other banks	210,906,000	293,805,000
Federal Reserve Bank and Federal Home Loan Bank stock	56,900,000	60,761,000
Loans held for sale	23,450,000	31,530,000
Available for sale investment securities	2,592,823,000	2,547,956,000
Net Loans	15,533,067,000	15,598,337,000
Accrued interest receivable	53,060,000	52,910,000
Other financial assets	216,952,000	215,464,000
Demand and savings deposits	12,763,521,000	13,042,147,000
Brokered Deposits	64,195,000	90,473,000
Time deposits	2,649,387,000	2,664,912,000
Short-term borrowings	937,852,000	617,524,000
Accrued interest payable	9,681,000	9,317,000
Other financial liabilities	209,483,000	227,569,000
Federal Home Loan Bank advances and long-term debt	938,499,000	1,038,346,000
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	100,151,000	108,291,000
Interest-bearing deposits with other banks	210,906,000	293,805,000
Federal Reserve Bank and Federal Home Loan Bank stock	56,900,000	60,761,000
Loans held for sale	23,450,000	31,530,000
Available for sale investment securities	2,592,823,000	2,547,956,000
Net Loans	14,933,445,000	15,380,974,000
Accrued interest receivable	53,060,000	52,910,000
Other financial assets	216,952,000	215,464,000
Demand and savings deposits	12,763,521,000	13,042,147,000
Brokered Deposits	64,195,000	90,473,000
Time deposits	2,647,498,000	2,664,912,000
Short-term borrowings	937,852,000	617,524,000
Accrued interest payable	9,681,000	9,317,000
Other financial liabilities	209,483,000	227,569,000
Federal Home Loan Bank advances and long-term debt	914,763,000	1,038,346,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	100,151,000	108,291,000
Interest-bearing deposits with other banks	210,906,000	293,805,000
Federal Reserve Bank and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Available for sale investment securities	0	918,000
Net Loans	0	0
Accrued interest receivable	53,060,000	52,910,000
Other financial assets	120,156,000	123,439,000
Demand and savings deposits	12,763,521,000	13,042,147,000
Brokered Deposits	64,195,000	90,473,000
Time deposits	0	0
Short-term borrowings	937,852,000	617,524,000
Accrued interest payable	9,681,000	9,317,000
Other financial liabilities	158,232,000	188,555,000
Federal Home Loan Bank advances and long-term debt	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	0	0
Interest-bearing deposits with other banks	0	0
Federal Reserve Bank and Federal Home Loan Bank stock	56,900,000	60,761,000
Loans held for sale	23,450,000	31,530,000
Available for sale investment securities	2,485,814,000	2,444,613,000
Net Loans	0	0
Accrued interest receivable	0	0
Other financial assets	48,304,000	44,539,000
Demand and savings deposits	0	0
Brokered Deposits	0	0
Time deposits	2,647,498,000	2,664,912,000
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	51,251,000	39,014,000
Federal Home Loan Bank advances and long-term debt	914,763,000	1,038,346,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	0	0
Interest-bearing deposits with other banks	0	0
Federal Reserve Bank and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Available for sale investment securities	107,009,000	102,425,000
Net Loans	14,933,445,000	15,380,974,000
Accrued interest receivable	0	0
Other financial assets	48,492,000	47,486,000
Demand and savings deposits	0	0
Brokered Deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	0	0
Federal Home Loan Bank advances and long-term debt	$ 0	$ 0

Fair Value Measurements Narrati

Fair Value Measurements Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities valued by the pricing service	80.00%
Researched securities to reconcile the difference	5.00%
Corporate debt securities	$ 2,592,823
Significant input, assumed market return to liquidity (years)	5 years
Other real estate owned (OREO)	$ 10,744	$ 9,823
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average annual constant prepayment rate	9.70%
Weighted average discount rate	9.50%
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Trust for Benefit of Employees [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	$ 19,100	19,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	428	460
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Trust for Benefit of Employees [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial liabilities	19,100	19,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial liabilities	229	374
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	1,200	1,100
Other financial liabilities	81	272
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	47,000	43,400
Other financial liabilities	51,200	37,800
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned (OREO)	10,744	9,823
Net MSRs at end of period	37,748	37,663
Financial Institutions Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	66,600	61,900
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	30,513	30,703
Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	30,500	30,700
Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	27,400	27,700
Single-issuer Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	3,100	3,100
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	865	707
Pooled Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	865	707
Other Corporate Debt [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	$ 4,000	$ 4,000