Fulton Financial (FULT) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 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	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		175,918,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 99,742	$ 108,291
Interest-bearing deposits with other banks	298,087	293,805
Federal Reserve Bank and Federal Home Loan Bank stock	66,715	60,761
Loans held for sale	35,898	31,530
Available for sale investment securities	2,593,283	2,547,956
Loans, net of unearned income	15,792,969	15,768,247
Less: Allowance for loan losses	(156,050)	(169,910)
Net Loans	15,636,919	15,598,337
Premises and equipment	230,195	222,802
Accrued interest receivable	55,208	52,910
Goodwill and intangible assets	531,556	531,556
Other assets	624,936	588,957
Total Assets	20,172,539	20,036,905
LIABILITIES
Noninterest-bearing	4,324,659	4,437,294
Interest-bearing	11,275,140	11,360,238
Total Deposits	15,599,799	15,797,532
Short-term borrowings:
Federal funds purchased	343,000	220,000
Other short-term borrowings	640,833	397,524
Total Short-Term Borrowings	983,833	617,524
Accrued interest payable	8,293	9,317
Other liabilities	342,881	344,329
Federal Home Loan Bank advances and other long-term debt	991,948	1,038,346
Total Liabilities	17,926,754	17,807,048
SHAREHOLDERS’ EQUITY
Common stock, $2.50 par value, 600 million shares authorized, 221.6 million shares issued in 2018 and 220.9 million shares issued in 2017	553,958	552,232
Additional paid-in capital	1,484,185	1,478,389
Retained earnings	871,192	821,619
Accumulated other comprehensive loss	(73,258)	(32,974)
Treasury stock, at cost, 45.7 million shares in 2018 and 2017	(590,292)	(589,409)
Total Shareholders’ Equity	2,245,785	2,229,857
Total Liabilities and Shareholders’ Equity	$ 20,172,539	$ 20,036,905

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 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)	221,600,000	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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME
Loans, including fees	$ 167,825	$ 148,440	$ 327,961	$ 291,006
Investment securities:
Taxable	13,885	11,474	27,078	23,388
Tax-exempt	2,933	2,856	5,898	5,705
Dividends	0	109	5	238
Loans held for sale	284	201	500	388
Other interest income	1,243	801	2,415	1,643
Total Interest Income	186,170	163,881	363,857	322,368
INTEREST EXPENSE
Deposits	19,284	12,884	35,734	24,685
Short-term borrowings	3,036	974	5,077	1,829
Federal Home Loan Bank advances and other long-term debt	7,783	8,460	15,661	16,712
Total Interest Expense	30,103	22,318	56,472	43,226
Net Interest Income	156,067	141,563	307,385	279,142
Provision for credit losses	33,117	6,700	37,087	11,500
Net Interest Income After Provision for Credit Losses	122,950	134,863	270,298	267,642
NON-INTEREST INCOME
Other service charges and fees	13,665	14,342	25,084	26,779
Service charges on deposit accounts	12,270	12,914	24,232	25,314
Investment management and trust services	12,803	12,132	25,674	23,940
Mortgage banking income	5,163	6,141	9,356	10,737
Investment securities gains, net	4	1,436	23	2,542
Other	5,189	5,406	10,600	9,732
Non-interest income before investment securities gains	49,090	50,935	94,946	96,502
Total Non-Interest Income	49,094	52,371	94,969	99,044
NON-INTEREST EXPENSE
Salaries and employee benefits	74,919	74,496	150,687	143,732
Net occupancy expense	12,760	12,316	26,392	24,979
Data processing and software	10,453	9,054	20,926	18,033
Other outside services	7,568	7,708	15,692	13,254
Amortization of tax credit investments	1,637	3,151	3,274	4,149
Professional fees	2,372	2,931	7,188	5,668
Equipment expense	3,434	3,034	6,968	6,393
FDIC insurance expense	2,663	2,366	5,616	4,424
Taxes, Other	2,454	2,814	4,756	4,900
Marketing	2,335	2,234	4,585	4,220
Other	12,750	12,591	23,922	25,218
Total Non-Interest Expense	133,345	132,695	270,006	254,970
Income Before Income Taxes	38,699	54,539	95,261	111,716
Income taxes	3,502	9,072	10,584	22,869
Net Income	$ 35,197	$ 45,467	$ 84,677	$ 88,847
PER SHARE:
Net Income (Basic) (in dollars per share)	$ 0.20	$ 0.26	$ 0.48	$ 0.51
Net Income (Diluted) (in dollars per share)	0.20	0.26	0.48	0.51
Cash Dividends (in dollars per share)	$ 0.12	$ 0.11	$ 0.24	$ 0.22

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 35,197	$ 45,467	$ 84,677	$ 88,847
Other Comprehensive (Loss) Income, net of tax:
Unrealized (loss) gain on securities	(6,631)	10,268	(34,275)	14,541
Reclassification adjustment for securities gains included in net income	(3)	(932)	(19)	(1,651)
Non-credit related unrealized gain on other-than-temporarily impaired debt securities	(8)	0	(232)	0
Amortization of net unrecognized pension and postretirement items	540	341	879	684
Other Comprehensive (Loss) Income	(6,086)	9,677	(33,183)	13,574
Total Comprehensive Income	$ 29,111	$ 55,144	$ 51,494	$ 102,421

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		88,847			88,847
Other comprehensive loss		13,574				13,574
Stock issued, including related tax benefits (in shares)			877
Stock issued		4,870	$ 2,229	4,178			(1,537)
Stock-based compensation awards		1,769		1,769
Common stock cash dividends		(38,405)			(38,405)
Ending Balance at Jun. 30, 2017		2,191,770	$ 551,936	1,473,549	782,541	(24,875)	(591,381)
Ending Balance (in shares) at Jun. 30, 2017			174,917
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		84,677			84,677
Other comprehensive loss		(33,183)				(33,183)
Stock issued, including related tax benefits (in shares)			661
Stock issued		2,455	$ 1,686	1,652			(883)
Stock-based compensation awards (in shares)			16
Stock-based compensation awards		4,184	$ 40	4,144
Reclassification of stranded tax effects	[1]	0			7,101	(7,101)
Common stock cash dividends		(42,205)			(42,205)
Ending Balance at Jun. 30, 2018		$ 2,245,785	$ 553,958	$ 1,484,185	$ 871,192	$ (73,258)	$ (590,292)
Ending Balance (in shares) at Jun. 30, 2018			175,847
[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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends per share	$ 0.12	$ 0.11	$ 0.24	$ 0.22

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 84,677	$ 88,847
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	37,087	11,500
Depreciation and amortization of premises and equipment	14,580	13,974
Amortization of tax credit investments	16,729	17,932
Net amortization of investment securities premiums	4,856	4,775
Investment securities gains, net	(23)	(2,542)
Gain on sales of mortgage loans held for sale	(6,499)	(6,562)
Proceeds from sales of mortgage loans held for sale	379,399	283,251
Originations of mortgage loans held for sale	(377,268)	(281,356)
Amortization of issuance costs on long-term debt	399	382
Stock-based compensation	4,184	1,769
Increase in accrued interest receivable	(2,298)	(1,309)
Increase in other assets	(10,687)	(44,542)
Decrease in accrued interest payable	(1,024)	(1,828)
(Decrease) increase in other liabilities	(9,278)	3,398
Total adjustments	50,157	(1,158)
Net cash provided by operating activities	134,834	87,689
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	48,731	29,518
Proceeds from principal repayments and maturities of securities available for sale	170,141	225,788
Purchase of securities available for sale	(306,713)	(158,078)
Increase in other interest-earning assets	(3,480)	(71,845)
Net increase in loans	(65,361)	(655,172)
Net change in tax credit investments	(21,973)	(13,726)
Net change in tax credit investments	38,544	12,725
Net cash used in investing activities	(217,199)	(656,240)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in demand and savings deposits	(265,298)	351,329
Net increase (decrease) in time deposits	67,565	(6,832)
Increase in short-term borrowings	366,309	153,542
Additions to long-term debt	50,000	223,251
Repayments of long-term debt	(100,081)	(115,075)
Net proceeds from issuance of common stock	2,455	4,870
Dividends paid	(40,378)	(36,614)
Net cash provided by financing activities	80,572	574,471
Net (Decrease) Increase in Cash and Restricted Cash	(1,793)	5,920
Cash and Restricted Cash at Beginning of Period	246,726	236,887
Cash and Restricted Cash at End of Period	244,933	242,807
Cash paid during the period for:
Interest	57,496	45,054
Income taxes	5,794	7,016
Supplemental schedule of certain noncash activities:
Transfer of student loans to loans held for sale	0	28,990
Restricted cash	$ 145,200	$ 147,900

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 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 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 adoption of ASC Update 2016-18 did not have a material impact on its consolidated financial statements; however on the Consolidated Statements of Cash Flows, the Corporation corrected an error related to the adoption of this standards update to include restricted cash along with cash and cash equivalents in the reconciliation of beginning-of-period and end-of-period total amounts. The change had no impact on net income or retained earnings. In addition, the Corporation will revise the Consolidated Statements of Cash Flows for the three months ended March 31, 2018 when the amounts are next presented in the first quarter of 2019 . 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 as 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 and 2018-11). 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. The Corporation is assessing various components of this new standard including the practical expedients it intends to elect at adoption, the final determination of the incremental borrowing rate and the impact to regulatory capital ratios. The recognition of operating leases on the Corporation's consolidated balance sheet and additional disclosures are 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. The Corporation’s steering committee and working group, which are comprised of individuals from various functional areas, are assessing processes, portfolio segmentation, systems requirements and solutions and resources to implement this new accounting standard. In addition, the Corporation has engaged a third-party consultant to assist with these implementation efforts. 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 amounts 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 six months ended June 30, 2017 were changed to conform to this presentation, resulting in a $12.7 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	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Weighted average shares outstanding (basic) 175,764 174,597 175,535 174,375 Impact of common stock equivalents 1,080 935 1,171 1,179 Weighted average shares outstanding (diluted) 176,844 175,532 176,706 175,554

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 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 June 30, 2018 Unrealized loss on securities $ (8,397 ) $ 1,766 $ (6,631 ) Reclassification adjustment for securities gains included in net income (1) (4 ) 1 (3 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 9 (1 ) 8 Amortization of net unrecognized pension and postretirement items (2) 683 (143 ) 540 Total Other Comprehensive Loss $ (7,709 ) $ 1,623 $ (6,086 ) Three months ended June 30, 2017 Unrealized gain on securities $ 15,798 $ (5,530 ) $ 10,268 Reclassification adjustment for securities gains included in net income (1) (1,436 ) 504 (932 ) Amortization of net unrecognized pension and postretirement items (2) 522 (181 ) 341 Total Other Comprehensive Income $ 14,884 $ (5,207 ) $ 9,677 Six months ended June 30, 2018 Unrealized loss on securities $ (43,388 ) $ 9,113 $ (34,275 ) Reclassification adjustment for securities gains included in net income (1) (23 ) 4 (19 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 294 (62 ) 232 Amortization of net unrecognized pension and postretirement items (2) 1,113 (234 ) 879 Total Other Comprehensive Loss $ (42,004 ) $ 8,821 $ (33,183 ) Six months ended June 30, 2017 Unrealized gain on securities $ 22,374 $ (7,833 ) $ 14,541 Reclassification adjustment for securities gains included in net income (1) (2,542 ) 891 (1,651 ) Amortization of net unrecognized pension and postretirement items (2) 1,051 (367 ) 684 Total Other Comprehensive Income $ 20,883 $ (7,309 ) $ 13,574 (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 June 30, 2018 Balance at March 31, 2018 $ (50,056 ) $ 682 $ (17,798 ) $ (67,172 ) Other comprehensive loss before reclassifications (6,631 ) 8 — (6,623 ) Amounts reclassified from accumulated other comprehensive income (loss) (3 ) — 540 537 Balance at June 30, 2018 $ (56,690 ) $ 690 $ (17,258 ) $ (73,258 ) Three months ended June 30, 2017 Balance at March 31, 2017 $ (19,493 ) $ 273 $ (15,332 ) $ (34,552 ) Other comprehensive income before reclassifications 10,268 — — 10,268 Amounts reclassified from accumulated other comprehensive income (loss) (932 ) — 341 (591 ) Balance at June 30, 2017 $ (10,157 ) $ 273 $ (14,991 ) $ (24,875 ) Six months ended June 30, 2018 Balance at December 31, 2017 $ (18,509 ) $ 458 $ (14,923 ) $ (32,974 ) Other comprehensive income before reclassifications (34,275 ) 232 — (34,043 ) Amounts reclassified from accumulated other comprehensive income (loss) (19 ) — 879 860 Reclassification of stranded tax effects (3,887 ) — (3,214 ) (7,101 ) Balance at June 30, 2018 $ (56,690 ) $ 690 $ (17,258 ) $ (73,258 ) Six months ended June 30, 2017 Balance at December 31, 2016 $ (23,047 ) $ 273 $ (15,675 ) $ (38,449 ) Other comprehensive income before reclassifications 14,541 — — 14,541 Amounts reclassified from accumulated other comprehensive income (loss) (1,651 ) — 684 (967 ) Balance at June 30, 2017 $ (10,157 ) $ 273 $ (14,991 ) $ (24,875 )

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 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) June 30, 2018 U.S. Government sponsored agency securities $ 26,830 $ 5 $ (309 ) $ 26,526 State and municipal securities 415,460 2,101 (9,865 ) 407,696 Corporate debt securities 92,411 1,261 (1,802 ) 91,870 Collateralized mortgage obligations 742,282 406 (18,366 ) 724,322 Residential mortgage-backed securities 1,035,724 2,342 (37,102 ) 1,000,964 Commercial mortgage-backed securities 244,046 34 (5,297 ) 238,783 Auction rate securities 107,410 — (4,288 ) 103,122 Total $ 2,664,163 $ 6,149 $ (77,029 ) $ 2,593,283 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 On August 1, 2018, the Corporation transferred debt securities with an amortized cost of $665.5 million and an estimated fair value of $641.7 million from the available for sale classification to the held to maturity classification. These securities consisted of residential mortgage-backed securities ( $505.5 million amortized cost and $485.3 million estimated fair value) and state and municipal securities ( $160.0 million amortized cost and $156.4 million estimated fair value). The transfer was accounted for at estimated fair value. These securities were transferred as the Corporation has the positive intent and ability to hold these securities to maturity. Securities carried at $1.5 billion at June 30, 2018 and $1.8 billion at 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 June 30, 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 $ 7,305 $ 7,313 Due from one year to five years 44,956 44,959 Due from five years to ten years 109,639 109,503 Due after ten years 480,211 467,439 642,111 629,214 Residential mortgage-backed securities (1) 1,035,724 1,000,964 Commercial mortgage-backed securities (1) 244,046 238,783 Collateralized mortgage obligations (1) 742,282 724,322 Total $ 2,664,163 $ 2,593,283 (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 and losses on the sales of equity and debt securities: Gross Gross Net Gains (Losses) Three months ended June 30, 2018 (in thousands) Equity securities $ — $ — $ — Debt securities 1,530 (1,526 ) 4 Total $ 1,530 $ (1,526 ) $ 4 Three months ended June 30, 2017 Equity securities $ 1,305 $ — $ 1,305 Debt securities 145 (14 ) 131 Total $ 1,450 $ (14 ) $ 1,436 Six months ended June 30, 2018 Equity securities $ 9 $ — $ 9 Debt securities 1,540 (1,526 ) 14 Total $ 1,549 $ (1,526 ) $ 23 Six months ended June 30, 2017 Equity securities $ 2,350 $ — $ 2,350 Debt securities 206 (14 ) 192 Total $ 2,556 $ (14 ) $ 2,542 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 June 30, 2018 and June 30, 2017 was $ 11.5 million . There were no other-than-temporary impairment charges recognized for the three and six months ended June 30, 2018 and June 30, 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 June 30, 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 June 30, 2018 (in thousands) U.S. Government sponsored agency securities $ 24,028 $ (309 ) $ — $ — $ 24,028 $ (309 ) State and municipal securities 166,323 (3,264 ) 113,946 (6,601 ) 280,269 (9,865 ) Corporate debt securities 35,112 (220 ) 22,554 (1,582 ) 57,666 (1,802 ) Collateralized mortgage obligations 529,808 (10,258 ) 136,723 (8,108 ) 666,531 (18,366 ) Residential mortgage-backed securities 501,230 (15,521 ) 450,713 (21,581 ) 951,943 (37,102 ) Commercial mortgage-backed securities 182,155 (3,903 ) 45,352 (1,394 ) 227,507 (5,297 ) Auction rate securities — — 103,122 (4,288 ) 103,122 (4,288 ) Total $ 1,438,656 $ (33,475 ) $ 872,410 $ (43,554 ) $ 2,311,066 $ (77,029 ) 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 June 30, 2018 . As of June 30, 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 and six months ended June 30, 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: June 30, 2018 December 31, 2017 Amortized cost Estimated fair value Amortized cost Estimated fair value (in thousands) Single-issuer trust preferred securities $ 21,779 $ 20,396 $ 31,335 $ 30,703 Subordinated debt 54,649 54,534 49,013 49,533 Senior debt 12,027 12,109 12,031 12,392 Pooled trust preferred securities — 875 — 707 Corporate debt securities issued by financial institutions 88,455 87,914 92,379 93,335 Other corporate debt securities 3,956 3,956 3,974 3,974 Available for sale corporate debt securities $ 92,411 $ 91,870 $ 96,353 $ 97,309 Single-issuer trust preferred securities had an unrealized loss of $1.4 million at June 30, 2018 . Two of the 11 single-issuer trust preferred securities, with an amortized cost of $2.0 million and an estimated fair value of $1.9 million at June 30, 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 $3.2 million at June 30, 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 and six months ended June 30, 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	6 Months Ended
	Jun. 30, 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: June 30, December 31, 2017 (in thousands) Real-estate - commercial mortgage $ 6,304,475 $ 6,364,804 Commercial - industrial, financial and agricultural 4,264,602 4,300,297 Real-estate - residential mortgage 2,094,530 1,954,711 Real-estate - home equity 1,491,395 1,559,719 Real-estate - construction 990,705 1,006,935 Consumer 360,315 313,783 Leasing and other 315,243 291,556 Overdrafts 1,778 4,113 Loans, gross of unearned income 15,823,043 15,795,918 Unearned income (30,074 ) (27,671 ) Loans, net of unearned income $ 15,792,969 $ 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 letters of credit 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: June 30, December 31, (in thousands) Allowance for loan losses $ 156,050 $ 169,910 Reserve for unfunded lending commitments 13,197 6,174 Allowance for credit losses $ 169,247 $ 176,084 The following table presents the activity in the allowance for credit losses: Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 176,019 $ 172,647 $ 176,084 $ 171,325 Loans charged off (42,160 ) (8,715 ) (48,557 ) (18,122 ) Recoveries of loans previously charged off 2,271 4,366 4,633 10,295 Net loans charged off (39,889 ) (4,349 ) (43,924 ) (7,827 ) Provision for credit losses 33,117 6,700 37,087 11,500 Balance at end of period $ 169,247 $ 174,998 $ 169,247 $ 174,998 Included in the provision for credit losses for the three and six months ended June 30, 2018 was a $36.8 million provision related to a single, large commercial lending relationship (" Commercial Relationship "). In addition, loans charged off for the same periods included a $33.9 million charge-off related to the Commercial Relationship . 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 June 30, 2018 Balance at March 31, 2018 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 $ — $ 163,217 Loans charged off (366 ) (38,632 ) (816 ) (483 ) (606 ) (712 ) (545 ) — (42,160 ) Recoveries of loans previously charged off 321 541 271 96 444 446 152 — 2,271 Net loans charged off (45 ) (38,091 ) (545 ) (387 ) (162 ) (266 ) (393 ) — (39,889 ) Provision for loan losses (1) (2,089 ) 35,306 (736 ) (370 ) 226 62 323 — 32,722 Balance at June 30, 2018 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ — $ 156,050 Three months ended June 30, 2017 Balance at March 31, 2017 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 Loans charged off (242 ) (5,353 ) (592 ) (124 ) (774 ) (430 ) (1,200 ) — (8,715 ) Recoveries of loans previously charged off 934 1,974 215 151 373 470 249 — 4,366 Net loans charged off 692 (3,379 ) (377 ) 27 (401 ) 40 (951 ) — (4,349 ) Provision for loan losses (1) 9,307 15,712 (5,988 ) (5,606 ) 2,434 (1,277 ) (212 ) (7,755 ) 6,615 Balance at June 30, 2017 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ — $ 172,342 Six months ended June 30, 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 (633 ) (42,637 ) (1,224 ) (645 ) (764 ) (1,604 ) (1,050 ) — (48,557 ) Recoveries of loans previously charged off 600 1,616 477 203 750 625 362 — 4,633 Net loans charged off (33 ) (41,021 ) (747 ) (442 ) (14 ) (979 ) (688 ) — (43,924 ) Provision for loan losses (1) (2,177 ) 33,786 (1,133 ) (1,142 ) (618 ) 633 715 — 30,064 Balance at June 30, 2018 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ — $ 156,050 Six months ended June 30, 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 (1,466 ) (10,880 ) (1,290 ) (340 ) (1,021 ) (1,286 ) (1,839 ) — (18,122 ) Recoveries of loans previously charged off 1,384 6,165 352 381 921 706 386 — 10,295 Net loans charged off (82 ) (4,715 ) (938 ) 41 (100 ) (580 ) (1,453 ) — (7,827 ) Provision for loan losses (1) 10,612 18,004 (8,407 ) (6,531 ) 3,179 (1,200 ) 366 (4,533 ) 11,490 Balance at June 30, 2017 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ — $ 172,342 (1) The provision for loan losses excluded a $395,000 and a $7.0 million increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2018 , respectively, and an $85,000 and a $10,000 increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2017, respectively. These amounts were reclassified to other liabilities on the consolidated balance sheets. 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 Total (in thousands) Allowance for loan losses at June 30, 2018: Loans collectively evaluated for impairment $ 48,489 $ 49,354 $ 5,093 $ 5,171 $ 5,338 $ 1,691 $ 1,984 $ 117,120 Loans individually evaluated for impairment 8,094 9,691 11,154 9,333 650 8 — 38,930 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ 156,050 Loans, net of unearned income at June 30, 2018 Loans collectively evaluated for impairment $ 6,252,747 $ 4,209,786 $ 1,466,393 $ 2,055,206 $ 981,584 $ 360,304 $ 286,947 $ 15,612,967 Loans individually evaluated for impairment 51,728 54,816 25,002 39,324 9,121 11 — 180,002 $ 6,304,475 $ 4,264,602 $ 1,491,395 $ 2,094,530 $ 990,705 $ 360,315 $ 286,947 $ 15,792,969 Allowance for loan losses at June 30, 2017: Loans collectively evaluated for impairment $ 49,055 $ 57,341 $ 7,607 $ 6,013 $ 5,370 $ 1,773 $ 2,105 $ 129,264 Loans individually evaluated for impairment 8,317 10,301 9,849 10,426 4,164 21 — 43,078 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ 172,342 Loans, net of unearned income at June 30, 2017: Loans collectively evaluated for impairment $ 6,212,998 $ 4,189,676 $ 1,557,989 $ 1,741,404 $ 921,839 $ 283,123 $ 252,253 $ 15,159,282 Loans individually evaluated for impairment 49,010 56,173 21,750 43,308 17,061 33 — 187,335 $ 6,262,008 $ 4,245,849 $ 1,579,739 $ 1,784,712 $ 938,900 $ 283,156 $ 252,253 $ 15,346,617 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 commitments greater than or equal to $1.0 million are evaluated individually for impairment. Impaired loans to borrowers with total 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 June 30, 2018 and December 31, 2017 , substantially all of the Corporation’s individually evaluated impaired loans with total commitments 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 June 30, 2018 and 2017 , approximately 88% and 87% , 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: June 30, 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 $ 27,582 $ 26,435 $ — $ 26,728 $ 22,886 $ — Commercial 41,971 26,761 — 44,936 39,550 — Real estate - residential mortgage 3,193 3,193 — 4,575 4,575 — Construction 11,162 7,213 — 12,477 8,100 — 83,908 63,602 — 88,716 75,111 — With a related allowance recorded: Real estate - commercial mortgage 32,432 25,293 8,094 33,710 25,895 8,112 Commercial 50,734 28,055 9,691 29,816 24,175 11,406 Real estate - home equity 28,776 25,002 11,154 28,282 24,693 11,124 Real estate - residential mortgage 41,025 36,131 9,333 42,597 37,132 9,895 Construction 5,595 1,908 650 7,308 4,097 967 Consumer 11 11 8 26 26 17 158,573 116,400 38,930 141,739 116,018 41,521 Total $ 242,481 $ 180,002 $ 38,930 $ 230,455 $ 191,129 $ 41,521 As of June 30, 2018 and December 31, 2017 , there were $63.6 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 June 30 Six months ended June 30 2018 2017 2018 2017 Average Interest Average Interest Average Interest Average Interest (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 27,127 $ 97 $ 22,316 $ 71 $ 25,713 $ 180 $ 23,360 141 Commercial 33,644 69 30,829 46 35,612 142 29,061 82 Real estate - residential mortgage 3,870 24 4,643 26 4,105 51 4,658 52 Construction 7,528 — 6,965 4 7,718 — 6,242 6 72,169 190 64,753 147 73,148 373 63,321 281 With a related allowance recorded: Real estate - commercial mortgage 25,419 91 27,710 88 25,578 175 28,288 173 Commercial 26,120 54 21,387 31 25,471 97 22,074 63 Real estate - home equity 24,907 195 20,352 117 24,835 379 19,969 212 Real estate - residential mortgage 36,261 223 39,500 225 36,551 444 40,119 455 Construction 2,400 — 8,446 4 2,966 — 7,542 7 Consumer 18 — 36 — 20 — 36 — Leasing, other and overdrafts — — — — — — 475 — 115,125 563 117,431 465 115,421 1,095 118,503 910 Total $ 187,294 $ 753 $ 182,184 $ 612 $ 188,569 $ 1,468 $ 181,824 1,191 (1) All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three and six months ended June 30, 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 in the preceding tables. 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 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 (dollars in thousands) Real estate - commercial mortgage $ 5,990,838 $ 6,066,396 $ 164,908 $ 147,604 $ 148,729 $ 150,804 $ 6,304,475 $ 6,364,804 Commercial - secured 3,823,052 3,831,485 139,345 121,842 146,190 179,113 4,108,587 4,132,440 Commercial - unsecured 147,914 159,620 3,726 5,478 4,375 2,759 156,015 167,857 Total commercial - industrial, financial and agricultural 3,970,966 3,991,105 143,071 127,320 150,565 181,872 4,264,602 4,300,297 Construction - commercial residential 128,641 143,759 3,996 5,259 10,429 14,084 143,066 163,102 Construction - commercial 762,920 761,218 344 846 5,382 3,752 768,646 765,816 Total construction (excluding Construction - other) 891,561 904,977 4,340 6,105 15,811 17,836 911,712 928,918 $ 10,853,365 $ 10,962,478 $ 312,319 $ 281,029 $ 315,105 $ 350,512 $ 11,480,789 $ 11,594,019 % of Total 94.5 % 94.6 % 2.7 % 2.4 % 2.7 % 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 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 (dollars in thousands) Real estate - home equity $ 1,470,006 $ 1,535,557 $ 9,703 $ 12,655 $ 11,686 $ 11,507 $ 1,491,395 $ 1,559,719 Real estate - residential mortgage 2,054,810 1,914,888 20,832 18,852 18,888 20,971 2,094,530 1,954,711 Construction - other 78,503 77,403 — 203 490 411 78,993 78,017 Consumer - direct 62,142 54,828 108 315 83 70 62,333 55,213 Consumer - indirect 294,686 254,663 3,027 3,681 269 226 297,982 258,570 Total consumer 356,828 309,491 3,135 3,996 352 296 360,315 313,783 Leasing, other and overdrafts 285,722 267,111 1,049 855 176 32 286,947 267,998 $ 4,245,869 $ 4,104,450 $ 34,719 $ 36,561 $ 31,592 $ 33,217 $ 4,312,180 $ 4,174,228 % of Total 98.5 % 98.3 % 0.8 % 0.9 % 0.7 % 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: June 30, December 31, (in thousands) Non-accrual loans $ 111,116 $ 124,749 Loans 90 days or more past due and still accruing 12,628 10,010 Total non-performing loans 123,744 134,759 Other real estate owned (OREO) 11,181 9,823 Total non-performing assets $ 134,925 $ 144,582 The following tables present past due status and non-accrual loans by portfolio segment and class segment: June 30, 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 $ 8,537 $ 961 $ 3,970 $ 35,308 $ 39,278 $ 48,776 $ 6,255,699 $ 6,304,475 Commercial - secured 14,687 2,249 299 43,005 43,304 60,240 4,048,347 4,108,587 Commercial - unsecured 350 162 129 612 741 1,253 154,762 156,015 Total commercial - industrial, financial and agricultural 15,037 2,411 428 43,617 44,045 61,493 4,203,109 4,264,602 Real estate - home equity 8,053 1,650 2,885 8,801 11,686 21,389 1,470,006 1,491,395 Real estate - residential mortgage 15,333 5,499 4,619 14,269 18,888 39,720 2,054,810 2,094,530 Construction - commercial residential 560 184 — 8,810 8,810 9,554 133,511 143,065 Construction - commercial — — — 19 19 19 768,628 768,647 Construction - other — — 198 292 490 490 78,503 78,993 Total real estate - construction 560 184 198 9,121 9,319 10,063 980,642 990,705 Consumer - direct 45 63 83 — 83 191 62,142 62,333 Consumer - indirect 2,535 492 269 — 269 3,296 294,686 297,982 Total consumer 2,580 555 352 — 352 3,487 356,828 360,315 Leasing, other and overdrafts 805 244 176 — 176 1,225 285,722 286,947 Total $ 50,905 $ 11,504 $ 12,628 $ 111,116 $ 123,744 $ 186,153 $ 15,606,816 $ 15,792,969 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: June 30, December 31, (in thousands) Real-estate - residential mortgage $ 25,055 $ 26,016 Real-estate - commercial mortgage 16,420 13,959 Real estate - home equity 16,201 15,558 Commercial 11,199 10,820 Consumer 11 26 Total accruing TDRs 68,886 66,379 Non-accrual TDRs (1) 24,743 29,051 Total TDRs $ 93,629 $ 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 and six months ended June 30, 2018 and 2017 : Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 Number of Loans Post-Modification Recorded Investment Number of Loans Post-Modification Recorded Investment 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 1 $ 77 — $ — 1 $ 77 2 $ 337 Bankruptcy — — 1 157 1 5 2 335 Real estate - commercial mortgage: Extend maturity without rate concession 1 4 3 663 6 8,261 4 981 Bankruptcy — — 1 12 — — 1 12 Real estate - home equity: Extend maturity without rate concession 23 1,346 17 1,275 40 2,622 33 2,559 Bankruptcy 5 313 10 1,063 7 421 17 1,516 Commercial: Extend maturity without rate concession 1 49 5 2,600 5 1,151 8 5,693 Bankruptcy — — 1 490 — — 2 523 Construction - commercial residential: Extend maturity without rate concession — — 1 1,204 — — 1 1,204 Total 31 $ 1,789 39 $ 7,464 60 $ 12,537 70 $ 13,160 The following table presents TDRs, by class segment, as of June 30, 2018 and 2017 that were modified in the previous 12 months and had a post-modification payment default during the six months ended June 30, 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 8 $ 863 7 $ 1,911 Real estate - commercial mortgage 1 176 3 674 Real estate - home equity 29 1,955 16 922 Commercial 5 146 5 2,772 Consumer — — 1 16 Total 43 $ 3,140 32 $ 6,295

Mortgage Servicing Rights

Mortgage Servicing Rights	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Amortized cost: Balance at beginning of period $ 37,748 $ 38,543 $ 37,663 $ 38,822 Originations of mortgage servicing rights 1,746 1,203 3,229 2,386 Amortization (1,600 ) (1,566 ) (2,998 ) (3,028 ) Balance at end of period $ 37,894 $ 38,180 $ 37,894 $ 38,180 Valuation allowance: Balance at beginning of period $ — $ (1,291 ) $ — $ (1,291 ) Reductions to valuation allowance — 1,291 — 1,291 Balance at end of period $ — $ — $ — $ — Net MSRs at end of period $ 37,894 $ 38,180 $ 37,894 $ 38,180 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 June 30, 2018. In the prior year, the Corporation determined that a reduction to the valuation allowance of $1.3 million was appropriate for the three and six months ended June 30, 2017.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 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 June 30, 2018 , the Employee Equity Plan had 10.6 million shares reserved for future grants through 2023 , and the Directors’ Plan had approximately 329,000 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Compensation expense $ 2,674 $ 1,035 $ 4,184 $ 1,769 Tax benefit (1,075 ) (1,940 ) (1,536 ) (2,684 ) Stock-based compensation expense, net of tax benefit $ 1,599 $ (905 ) $ 2,648 $ (915 ) For the three and six months ended June 30, 2017, the tax benefit exceeded the stock-based compensation expense as a result of excess tax benefits related to stock option exercises and vesting RSUs and PSUs during the periods, which were recorded as a reduction to income tax expense as required under ASU 2016-09.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest cost $ 696 $ 830 1,527 1,660 Expected return on plan assets (573 ) (451 ) (1,024 ) (902 ) Net amortization and deferral 551 663 1,215 1,326 Net periodic pension cost $ 674 $ 1,042 $ 1,718 $ 2,084 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components: Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest cost $ 12 $ 17 $ 29 $ 34 Net accretion and deferral (139 ) (141 ) (280 ) (282 ) Net periodic benefit $ (127 ) $ (124 ) $ (251 ) $ (248 ) 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	6 Months Ended
	Jun. 30, 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: June 30, 2018 December 31, 2017 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 158,905 $ 1,425 $ 129,469 $ 1,059 Negative fair values 8,765 (65 ) 8,957 (59 ) Net interest rate locks with customers 1,360 1,000 Forward Commitments Positive fair values 12,829 5 3,856 34 Negative fair values 114,774 (499 ) 100,808 (213 ) Net forward commitments (494 ) (179 ) Interest Rate Swaps with Customers Positive fair values 431,935 7,903 1,316,548 24,505 Negative fair values 1,802,086 (57,393 ) 716,634 (18,978 ) Net interest rate swaps with customers (49,490 ) 5,527 Interest Rate Swaps with Dealer Counterparties Positive fair values (1) (3) 1,802,086 48,518 716,634 18,941 Negative fair values (2) (3) 431,935 (4,716 ) 1,316,548 (19,764 ) Net interest rate swaps with dealer counterparties 43,802 (823 ) Foreign Exchange Contracts with Customers Positive fair values 10,564 335 4,852 276 Negative fair values 6,758 (194 ) 5,914 (119 ) Net foreign exchange contracts with customers 141 157 Foreign Exchange Contracts with Correspondent Banks Positive fair values 9,397 296 7,960 184 Negative fair values 12,147 (329 ) 6,048 (255 ) Net foreign exchange contracts with correspondent banks (33 ) (71 ) Net derivative fair value asset $ (4,714 ) $ 5,611 (1) Includes centrally cleared interest rate swaps with a notional amount of $399.3 million and a fair value of $0 as of June 30, 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 $158.8 million and a fair value of $0 as of June 30, 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 $5.8 million at June 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest rate locks with customers $ 231 $ (155 ) $ 360 $ 690 Forward commitments (541 ) 157 (315 ) (2,222 ) Interest rate swaps with customers (12,375 ) 13,809 (55,017 ) 12,994 Interest rate swaps with dealer counterparties (1) 10,811 (10,831 ) 44,625 (7,830 ) Foreign exchange contracts with customers (23 ) (325 ) (16 ) (317 ) Foreign exchange contracts with correspondent banks (50 ) 367 38 330 Net fair value (losses) gains on derivative financial instruments $ (1,947 ) $ 3,022 $ (10,325 ) $ 3,645 (1) Not included is $1.6 million and $10.4 million , respectively, of gains representing the change in the variation margin for the three and six months ended June 30, 2018 and $2.9 million and $5.1 million , respectively, of losses representing the change in the variation margin for the three and six months ended June 30, 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: June 30, December 31, (in thousands) Cost (1) $ 35,310 $ 31,069 Fair value 35,898 31,530 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance. For the three months ended June 30, 2018 and June 30, 2017 , gains related to changes in fair values of mortgage loans held for sale were $324,000 and $26,000 , respectively. During the six months ended June 30, 2018 and June 30, 2017 , the Corporation recorded gains related to changes in fair values of mortgage loans held for sale of $127,000 and $565,000 , respectfully. 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) June 30, 2018 Interest rate swap derivative assets $ 56,421 $ (5,916 ) $ (44,080 ) $ 6,425 Foreign exchange derivative assets with correspondent banks 296 (296 ) — — Total $ 56,717 $ (6,212 ) $ (44,080 ) $ 6,425 Interest rate swap derivative liabilities $ 62,109 $ (5,916 ) $ (13,177 ) $ 43,016 Foreign exchange derivative liabilities with correspondent banks 329 (296 ) — 33 Total $ 62,438 $ (6,212 ) $ (13,177 ) $ 43,049 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	6 Months Ended
	Jun. 30, 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: June 30, December 31, 2017 (in thousands) Commitments to extend credit $ 6,498,732 $ 6,205,029 Standby letters of credit 321,372 326,973 Commercial letters of credit 42,018 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 The Corporation originates and sells residential mortgages to secondary market investors. The Corporation provides customary representations and warranties to secondary market investors that specify, among other things, that the loans have been underwritten to the standards of the secondary market investor. The Corporation may be required to repurchase specific loans, or reimburse the investor for a credit loss incurred on a sold loan if it is determined that the representations and warranties have not been met. Under some agreements with secondary market investors, the Corporation may have additional credit exposure beyond customary representations and warranties, based on the specific terms of those agreements. The Corporation maintains a reserve for estimated credit losses related to loans sold to investors. As of June 30, 2018 and December 31, 2017, the total reserve for losses on residential mortgage loans sold was $1.9 million and $2.1 million , respectively, including reserves for both representation and warranty and credit loss exposures. 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. 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	6 Months Ended
	Jun. 30, 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: June 30, 2018 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 35,898 $ — $ 35,898 Available for sale investment securities: U.S. Government sponsored agency securities — 26,526 — 26,526 State and municipal securities — 407,696 — 407,696 Corporate debt securities — 87,795 4,075 91,870 Collateralized mortgage obligations — 724,322 — 724,322 Residential mortgage-backed securities — 1,000,964 — 1,000,964 Commercial mortgage-backed securities — 238,783 — 238,783 Auction rate securities — — 103,122 103,122 Total available for sale investment securities — 2,486,086 107,197 2,593,283 Investments held in Rabbi Trust 19,510 — — 19,510 Other assets 639 57,851 — 58,490 Total assets $ 20,149 $ 2,579,835 $ 107,197 $ 2,707,181 Other liabilities $ 20,034 $ 62,673 $ — $ 82,707 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 Investments held in Rabbi Trust 18,982 — — 18,982 Other assets 469 44,539 — 45,008 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 June 30, 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 June 30, 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 June 30, 2018 and $61.9 million at December 31, 2017 ), single-issuer trust preferred securities issued by financial institutions ( $20.4 million at June 30, 2018 and $30.7 million at December 31, 2017 ), pooled trust preferred securities issued by financial institutions ( $875,000 at June 30, 2018 and $707,000 at December 31, 2017 ) and other corporate debt issued by non-financial institutions ( $4.0 million at both June 30, 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 $17.2 million and $27.7 million of single-issuer trust preferred securities held at June 30, 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 ( $875,000 at June 30, 2018 and $707,000 at December 31, 2017 ) and certain single-issuer trust preferred securities ( $3.2 million at June 30, 2018 and $3.1 million 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. Investments held in Rabbi Trust - This category consists of mutual funds that are held in trust for employee deferred compensation plans that the Corporation has elected to measure at fair value. Shares of mutual funds are valued based on net asset value, which represent quoted market prices for the underlying shares held in the mutual funds, and as such, are classified as Level 1 and are included in "other assets" on the consolidated balance sheet. Other assets – Included in this category are the following: • Level 1 assets include the fair value of foreign currency exchange contracts ( $631,000 at June 30, 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 ( $1.4 million at June 30, 2018 and $1.1 million at December 31, 2017 ) and the fair value of interest rate swaps ( $56.4 million at June 30, 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 ( $19.5 million at June 30, 2018 and $19.0 million at December 31, 2017 ) and the fair value of foreign currency exchange contracts ( $523,000 at June 30, 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 ( $564,000 at June 30, 2018 and $272,000 at December 31, 2017 ) and the fair value of interest rate swaps ( $62.1 million at June 30, 2018 and $38.7 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 June 30, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at March 31, 2018 $ 865 $ 3,095 $ 103,049 Unrealized adjustment to fair value (1) 10 102 73 Discount accretion (2) — 3 — Balance at June 30, 2018 $ 875 $ 3,200 $ 103,122 Three months ended June 30, 2017 Balance at March 31, 2017 $ 422 $ 2,750 $ 97,439 Unrealized adjustment to fair value (1) — 22 386 Discount accretion (2) — 3 98 Balance at June 30, 2017 $ 422 $ 2,775 $ 97,923 Six months ended June 30, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at December 31, 2017 $ 707 $ 3,050 $ 98,668 Unrealized adjustment to fair value (1) 168 144 4,454 Discount accretion (2) — 6 — Balance at June 30, 2018 $ 875 $ 3,200 $ 103,122 Six months ended June 30, 2017 Balance at December 31, 2016 $ 422 $ 2,450 $ 97,256 Unrealized adjustment to fair value (1) — 319 472 Discount accretion (2) — 6 195 Balance at June 30, 2017 $ 422 $ 2,775 $ 97,923 (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: June 30, 2018 December 31, 2017 (in thousands) Net loans $ 141,072 $ 149,608 OREO 11,181 9,823 MSRs 37,894 37,663 Total assets $ 190,147 $ 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 June 30, 2018 valuation were 9.2% and 9.0% , 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 June 30, 2018 and December 31, 2017 . In addition, a general description of the methods and assumptions used to estimate such fair values is also provided. June 30, 2018 Amortized Cost Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 99,742 $ 99,742 $ — $ — $ 99,742 Interest-bearing deposits with other banks 298,087 298,087 — — 298,087 Federal Reserve Bank and Federal Home Loan Bank stock 66,715 — 66,715 — 66,715 Loans held for sale 35,898 — 35,898 — 35,898 Available for sale investment securities 2,593,283 — 2,486,086 107,197 2,593,283 Net Loans 15,636,919 — — 14,996,906 14,996,906 Accrued interest receivable 55,208 55,208 — — 55,208 Other financial assets 229,475 122,547 57,851 49,077 229,475 FINANCIAL LIABILITIES Demand and savings deposits $ 12,776,849 $ 12,776,849 $ — $ — $ 12,776,849 Brokered deposits 161,447 161,447 — — 161,447 Time deposits 2,661,503 — 2,656,421 — 2,656,421 Short-term borrowings 983,833 983,833 — — 983,833 Accrued interest payable 8,293 8,293 — — 8,293 Other financial liabilities 251,170 188,497 62,673 — 251,170 Federal Home Loan Bank advances and long-term debt 991,948 — 964,318 — 964,318 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 June 30, 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. Beginning in 2018, fair values estimated in this manner are considered to represent estimated exit prices, required by ASU 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities". 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)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 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 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 adoption of ASC Update 2016-18 did not have a material impact on its consolidated financial statements; however on the Consolidated Statements of Cash Flows, the Corporation corrected an error related to the adoption of this standards update to include restricted cash along with cash and cash equivalents in the reconciliation of beginning-of-period and end-of-period total amounts. The change had no impact on net income or retained earnings. In addition, the Corporation will revise the Consolidated Statements of Cash Flows for the three months ended March 31, 2018 when the amounts are next presented in the first quarter of 2019 . 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 as 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 and 2018-11). 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. The Corporation is assessing various components of this new standard including the practical expedients it intends to elect at adoption, the final determination of the incremental borrowing rate and the impact to regulatory capital ratios. The recognition of operating leases on the Corporation's consolidated balance sheet and additional disclosures are 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. The Corporation’s steering committee and working group, which are comprised of individuals from various functional areas, are assessing processes, portfolio segmentation, systems requirements and solutions and resources to implement this new accounting standard. In addition, the Corporation has engaged a third-party consultant to assist with these implementation efforts. 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 amounts 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 six months ended June 30, 2017 were changed to conform to this presentation, resulting in a $12.7 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)	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Weighted average shares outstanding (basic) 175,764 174,597 175,535 174,375 Impact of common stock equivalents 1,080 935 1,171 1,179 Weighted average shares outstanding (diluted) 176,844 175,532 176,706 175,554

Accumulated Other Comprehensi22

Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Unrealized loss on securities $ (8,397 ) $ 1,766 $ (6,631 ) Reclassification adjustment for securities gains included in net income (1) (4 ) 1 (3 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 9 (1 ) 8 Amortization of net unrecognized pension and postretirement items (2) 683 (143 ) 540 Total Other Comprehensive Loss $ (7,709 ) $ 1,623 $ (6,086 ) Three months ended June 30, 2017 Unrealized gain on securities $ 15,798 $ (5,530 ) $ 10,268 Reclassification adjustment for securities gains included in net income (1) (1,436 ) 504 (932 ) Amortization of net unrecognized pension and postretirement items (2) 522 (181 ) 341 Total Other Comprehensive Income $ 14,884 $ (5,207 ) $ 9,677 Six months ended June 30, 2018 Unrealized loss on securities $ (43,388 ) $ 9,113 $ (34,275 ) Reclassification adjustment for securities gains included in net income (1) (23 ) 4 (19 ) Non-credit related unrealized gains on other-than-temporarily impaired debt securities 294 (62 ) 232 Amortization of net unrecognized pension and postretirement items (2) 1,113 (234 ) 879 Total Other Comprehensive Loss $ (42,004 ) $ 8,821 $ (33,183 ) Six months ended June 30, 2017 Unrealized gain on securities $ 22,374 $ (7,833 ) $ 14,541 Reclassification adjustment for securities gains included in net income (1) (2,542 ) 891 (1,651 ) Amortization of net unrecognized pension and postretirement items (2) 1,051 (367 ) 684 Total Other Comprehensive Income $ 20,883 $ (7,309 ) $ 13,574 (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 June 30, 2018 Balance at March 31, 2018 $ (50,056 ) $ 682 $ (17,798 ) $ (67,172 ) Other comprehensive loss before reclassifications (6,631 ) 8 — (6,623 ) Amounts reclassified from accumulated other comprehensive income (loss) (3 ) — 540 537 Balance at June 30, 2018 $ (56,690 ) $ 690 $ (17,258 ) $ (73,258 ) Three months ended June 30, 2017 Balance at March 31, 2017 $ (19,493 ) $ 273 $ (15,332 ) $ (34,552 ) Other comprehensive income before reclassifications 10,268 — — 10,268 Amounts reclassified from accumulated other comprehensive income (loss) (932 ) — 341 (591 ) Balance at June 30, 2017 $ (10,157 ) $ 273 $ (14,991 ) $ (24,875 ) Six months ended June 30, 2018 Balance at December 31, 2017 $ (18,509 ) $ 458 $ (14,923 ) $ (32,974 ) Other comprehensive income before reclassifications (34,275 ) 232 — (34,043 ) Amounts reclassified from accumulated other comprehensive income (loss) (19 ) — 879 860 Reclassification of stranded tax effects (3,887 ) — (3,214 ) (7,101 ) Balance at June 30, 2018 $ (56,690 ) $ 690 $ (17,258 ) $ (73,258 ) Six months ended June 30, 2017 Balance at December 31, 2016 $ (23,047 ) $ 273 $ (15,675 ) $ (38,449 ) Other comprehensive income before reclassifications 14,541 — — 14,541 Amounts reclassified from accumulated other comprehensive income (loss) (1,651 ) — 684 (967 ) Balance at June 30, 2017 $ (10,157 ) $ 273 $ (14,991 ) $ (24,875 )

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 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) June 30, 2018 U.S. Government sponsored agency securities $ 26,830 $ 5 $ (309 ) $ 26,526 State and municipal securities 415,460 2,101 (9,865 ) 407,696 Corporate debt securities 92,411 1,261 (1,802 ) 91,870 Collateralized mortgage obligations 742,282 406 (18,366 ) 724,322 Residential mortgage-backed securities 1,035,724 2,342 (37,102 ) 1,000,964 Commercial mortgage-backed securities 244,046 34 (5,297 ) 238,783 Auction rate securities 107,410 — (4,288 ) 103,122 Total $ 2,664,163 $ 6,149 $ (77,029 ) $ 2,593,283 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 June 30, 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 $ 7,305 $ 7,313 Due from one year to five years 44,956 44,959 Due from five years to ten years 109,639 109,503 Due after ten years 480,211 467,439 642,111 629,214 Residential mortgage-backed securities (1) 1,035,724 1,000,964 Commercial mortgage-backed securities (1) 244,046 238,783 Collateralized mortgage obligations (1) 742,282 724,322 Total $ 2,664,163 $ 2,593,283 (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 and losses on the sales of equity and debt securities: Gross Gross Net Gains (Losses) Three months ended June 30, 2018 (in thousands) Equity securities $ — $ — $ — Debt securities 1,530 (1,526 ) 4 Total $ 1,530 $ (1,526 ) $ 4 Three months ended June 30, 2017 Equity securities $ 1,305 $ — $ 1,305 Debt securities 145 (14 ) 131 Total $ 1,450 $ (14 ) $ 1,436 Six months ended June 30, 2018 Equity securities $ 9 $ — $ 9 Debt securities 1,540 (1,526 ) 14 Total $ 1,549 $ (1,526 ) $ 23 Six months ended June 30, 2017 Equity securities $ 2,350 $ — $ 2,350 Debt securities 206 (14 ) 192 Total $ 2,556 $ (14 ) $ 2,542
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 June 30, 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 June 30, 2018 (in thousands) U.S. Government sponsored agency securities $ 24,028 $ (309 ) $ — $ — $ 24,028 $ (309 ) State and municipal securities 166,323 (3,264 ) 113,946 (6,601 ) 280,269 (9,865 ) Corporate debt securities 35,112 (220 ) 22,554 (1,582 ) 57,666 (1,802 ) Collateralized mortgage obligations 529,808 (10,258 ) 136,723 (8,108 ) 666,531 (18,366 ) Residential mortgage-backed securities 501,230 (15,521 ) 450,713 (21,581 ) 951,943 (37,102 ) Commercial mortgage-backed securities 182,155 (3,903 ) 45,352 (1,394 ) 227,507 (5,297 ) Auction rate securities — — 103,122 (4,288 ) 103,122 (4,288 ) Total $ 1,438,656 $ (33,475 ) $ 872,410 $ (43,554 ) $ 2,311,066 $ (77,029 ) 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: June 30, 2018 December 31, 2017 Amortized cost Estimated fair value Amortized cost Estimated fair value (in thousands) Single-issuer trust preferred securities $ 21,779 $ 20,396 $ 31,335 $ 30,703 Subordinated debt 54,649 54,534 49,013 49,533 Senior debt 12,027 12,109 12,031 12,392 Pooled trust preferred securities — 875 — 707 Corporate debt securities issued by financial institutions 88,455 87,914 92,379 93,335 Other corporate debt securities 3,956 3,956 3,974 3,974 Available for sale corporate debt securities $ 92,411 $ 91,870 $ 96,353 $ 97,309

Loans and Allowance for Credi24

Loans and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Summary of Gross Loans by Type	Loans, net of unearned income are summarized as follows: June 30, December 31, 2017 (in thousands) Real-estate - commercial mortgage $ 6,304,475 $ 6,364,804 Commercial - industrial, financial and agricultural 4,264,602 4,300,297 Real-estate - residential mortgage 2,094,530 1,954,711 Real-estate - home equity 1,491,395 1,559,719 Real-estate - construction 990,705 1,006,935 Consumer 360,315 313,783 Leasing and other 315,243 291,556 Overdrafts 1,778 4,113 Loans, gross of unearned income 15,823,043 15,795,918 Unearned income (30,074 ) (27,671 ) Loans, net of unearned income $ 15,792,969 $ 15,768,247
Schedule of Allowance for Credit Losses	The following table presents the components of the allowance for credit losses: June 30, December 31, (in thousands) Allowance for loan losses $ 156,050 $ 169,910 Reserve for unfunded lending commitments 13,197 6,174 Allowance for credit losses $ 169,247 $ 176,084
Activity in the Allowance for Credit Losses	The following table presents the activity in the allowance for credit losses: Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 176,019 $ 172,647 $ 176,084 $ 171,325 Loans charged off (42,160 ) (8,715 ) (48,557 ) (18,122 ) Recoveries of loans previously charged off 2,271 4,366 4,633 10,295 Net loans charged off (39,889 ) (4,349 ) (43,924 ) (7,827 ) Provision for credit losses 33,117 6,700 37,087 11,500 Balance at end of period $ 169,247 $ 174,998 $ 169,247 $ 174,998 Included in the provision for credit losses for the three and six months ended June 30, 2018 was a $36.8 million provision related to a single, large commercial lending relationship (" Commercial Relationship "). In addition, loans charged off for the same periods included a $33.9 million charge-off related to the Commercial Relationship . 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 June 30, 2018 Balance at March 31, 2018 $ 58,717 $ 61,830 $ 17,528 $ 15,261 $ 5,924 $ 1,903 $ 2,054 $ — $ 163,217 Loans charged off (366 ) (38,632 ) (816 ) (483 ) (606 ) (712 ) (545 ) — (42,160 ) Recoveries of loans previously charged off 321 541 271 96 444 446 152 — 2,271 Net loans charged off (45 ) (38,091 ) (545 ) (387 ) (162 ) (266 ) (393 ) — (39,889 ) Provision for loan losses (1) (2,089 ) 35,306 (736 ) (370 ) 226 62 323 — 32,722 Balance at June 30, 2018 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ — $ 156,050 Three months ended June 30, 2017 Balance at March 31, 2017 $ 47,373 $ 55,309 $ 23,821 $ 22,018 $ 7,501 $ 3,031 $ 3,268 $ 7,755 $ 170,076 Loans charged off (242 ) (5,353 ) (592 ) (124 ) (774 ) (430 ) (1,200 ) — (8,715 ) Recoveries of loans previously charged off 934 1,974 215 151 373 470 249 — 4,366 Net loans charged off 692 (3,379 ) (377 ) 27 (401 ) 40 (951 ) — (4,349 ) Provision for loan losses (1) 9,307 15,712 (5,988 ) (5,606 ) 2,434 (1,277 ) (212 ) (7,755 ) 6,615 Balance at June 30, 2017 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ — $ 172,342 Six months ended June 30, 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 (633 ) (42,637 ) (1,224 ) (645 ) (764 ) (1,604 ) (1,050 ) — (48,557 ) Recoveries of loans previously charged off 600 1,616 477 203 750 625 362 — 4,633 Net loans charged off (33 ) (41,021 ) (747 ) (442 ) (14 ) (979 ) (688 ) — (43,924 ) Provision for loan losses (1) (2,177 ) 33,786 (1,133 ) (1,142 ) (618 ) 633 715 — 30,064 Balance at June 30, 2018 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ — $ 156,050 Six months ended June 30, 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 (1,466 ) (10,880 ) (1,290 ) (340 ) (1,021 ) (1,286 ) (1,839 ) — (18,122 ) Recoveries of loans previously charged off 1,384 6,165 352 381 921 706 386 — 10,295 Net loans charged off (82 ) (4,715 ) (938 ) 41 (100 ) (580 ) (1,453 ) — (7,827 ) Provision for loan losses (1) 10,612 18,004 (8,407 ) (6,531 ) 3,179 (1,200 ) 366 (4,533 ) 11,490 Balance at June 30, 2017 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ — $ 172,342 (1) The provision for loan losses excluded a $395,000 and a $7.0 million increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2018 , respectively, and an $85,000 and a $10,000 increase in the reserve for unfunded lending commitments for the three and six months ended June 30, 2017, respectively. These amounts were reclassified to other liabilities on the consolidated balance sheets. 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 Total (in thousands) Allowance for loan losses at June 30, 2018: Loans collectively evaluated for impairment $ 48,489 $ 49,354 $ 5,093 $ 5,171 $ 5,338 $ 1,691 $ 1,984 $ 117,120 Loans individually evaluated for impairment 8,094 9,691 11,154 9,333 650 8 — 38,930 $ 56,583 $ 59,045 $ 16,247 $ 14,504 $ 5,988 $ 1,699 $ 1,984 $ 156,050 Loans, net of unearned income at June 30, 2018 Loans collectively evaluated for impairment $ 6,252,747 $ 4,209,786 $ 1,466,393 $ 2,055,206 $ 981,584 $ 360,304 $ 286,947 $ 15,612,967 Loans individually evaluated for impairment 51,728 54,816 25,002 39,324 9,121 11 — 180,002 $ 6,304,475 $ 4,264,602 $ 1,491,395 $ 2,094,530 $ 990,705 $ 360,315 $ 286,947 $ 15,792,969 Allowance for loan losses at June 30, 2017: Loans collectively evaluated for impairment $ 49,055 $ 57,341 $ 7,607 $ 6,013 $ 5,370 $ 1,773 $ 2,105 $ 129,264 Loans individually evaluated for impairment 8,317 10,301 9,849 10,426 4,164 21 — 43,078 $ 57,372 $ 67,642 $ 17,456 $ 16,439 $ 9,534 $ 1,794 $ 2,105 $ 172,342 Loans, net of unearned income at June 30, 2017: Loans collectively evaluated for impairment $ 6,212,998 $ 4,189,676 $ 1,557,989 $ 1,741,404 $ 921,839 $ 283,123 $ 252,253 $ 15,159,282 Loans individually evaluated for impairment 49,010 56,173 21,750 43,308 17,061 33 — 187,335 $ 6,262,008 $ 4,245,849 $ 1,579,739 $ 1,784,712 $ 938,900 $ 283,156 $ 252,253 $ 15,346,617
Total Impaired Loans by Class Segment	The following table presents total impaired loans by class segment: June 30, 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 $ 27,582 $ 26,435 $ — $ 26,728 $ 22,886 $ — Commercial 41,971 26,761 — 44,936 39,550 — Real estate - residential mortgage 3,193 3,193 — 4,575 4,575 — Construction 11,162 7,213 — 12,477 8,100 — 83,908 63,602 — 88,716 75,111 — With a related allowance recorded: Real estate - commercial mortgage 32,432 25,293 8,094 33,710 25,895 8,112 Commercial 50,734 28,055 9,691 29,816 24,175 11,406 Real estate - home equity 28,776 25,002 11,154 28,282 24,693 11,124 Real estate - residential mortgage 41,025 36,131 9,333 42,597 37,132 9,895 Construction 5,595 1,908 650 7,308 4,097 967 Consumer 11 11 8 26 26 17 158,573 116,400 38,930 141,739 116,018 41,521 Total $ 242,481 $ 180,002 $ 38,930 $ 230,455 $ 191,129 $ 41,521 As of June 30, 2018 and December 31, 2017 , there were $63.6 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 June 30 Six months ended June 30 2018 2017 2018 2017 Average Interest Average Interest Average Interest Average Interest (in thousands) With no related allowance recorded: Real estate - commercial mortgage $ 27,127 $ 97 $ 22,316 $ 71 $ 25,713 $ 180 $ 23,360 141 Commercial 33,644 69 30,829 46 35,612 142 29,061 82 Real estate - residential mortgage 3,870 24 4,643 26 4,105 51 4,658 52 Construction 7,528 — 6,965 4 7,718 — 6,242 6 72,169 190 64,753 147 73,148 373 63,321 281 With a related allowance recorded: Real estate - commercial mortgage 25,419 91 27,710 88 25,578 175 28,288 173 Commercial 26,120 54 21,387 31 25,471 97 22,074 63 Real estate - home equity 24,907 195 20,352 117 24,835 379 19,969 212 Real estate - residential mortgage 36,261 223 39,500 225 36,551 444 40,119 455 Construction 2,400 — 8,446 4 2,966 — 7,542 7 Consumer 18 — 36 — 20 — 36 — Leasing, other and overdrafts — — — — — — 475 — 115,125 563 117,431 465 115,421 1,095 118,503 910 Total $ 187,294 $ 753 $ 182,184 $ 612 $ 188,569 $ 1,468 $ 181,824 1,191 (1) All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three and six months ended June 30, 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 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 (dollars in thousands) Real estate - commercial mortgage $ 5,990,838 $ 6,066,396 $ 164,908 $ 147,604 $ 148,729 $ 150,804 $ 6,304,475 $ 6,364,804 Commercial - secured 3,823,052 3,831,485 139,345 121,842 146,190 179,113 4,108,587 4,132,440 Commercial - unsecured 147,914 159,620 3,726 5,478 4,375 2,759 156,015 167,857 Total commercial - industrial, financial and agricultural 3,970,966 3,991,105 143,071 127,320 150,565 181,872 4,264,602 4,300,297 Construction - commercial residential 128,641 143,759 3,996 5,259 10,429 14,084 143,066 163,102 Construction - commercial 762,920 761,218 344 846 5,382 3,752 768,646 765,816 Total construction (excluding Construction - other) 891,561 904,977 4,340 6,105 15,811 17,836 911,712 928,918 $ 10,853,365 $ 10,962,478 $ 312,319 $ 281,029 $ 315,105 $ 350,512 $ 11,480,789 $ 11,594,019 % of Total 94.5 % 94.6 % 2.7 % 2.4 % 2.7 % 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 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 (dollars in thousands) Real estate - home equity $ 1,470,006 $ 1,535,557 $ 9,703 $ 12,655 $ 11,686 $ 11,507 $ 1,491,395 $ 1,559,719 Real estate - residential mortgage 2,054,810 1,914,888 20,832 18,852 18,888 20,971 2,094,530 1,954,711 Construction - other 78,503 77,403 — 203 490 411 78,993 78,017 Consumer - direct 62,142 54,828 108 315 83 70 62,333 55,213 Consumer - indirect 294,686 254,663 3,027 3,681 269 226 297,982 258,570 Total consumer 356,828 309,491 3,135 3,996 352 296 360,315 313,783 Leasing, other and overdrafts 285,722 267,111 1,049 855 176 32 286,947 267,998 $ 4,245,869 $ 4,104,450 $ 34,719 $ 36,561 $ 31,592 $ 33,217 $ 4,312,180 $ 4,174,228 % of Total 98.5 % 98.3 % 0.8 % 0.9 % 0.7 % 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: June 30, December 31, (in thousands) Non-accrual loans $ 111,116 $ 124,749 Loans 90 days or more past due and still accruing 12,628 10,010 Total non-performing loans 123,744 134,759 Other real estate owned (OREO) 11,181 9,823 Total non-performing assets $ 134,925 $ 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: June 30, 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 $ 8,537 $ 961 $ 3,970 $ 35,308 $ 39,278 $ 48,776 $ 6,255,699 $ 6,304,475 Commercial - secured 14,687 2,249 299 43,005 43,304 60,240 4,048,347 4,108,587 Commercial - unsecured 350 162 129 612 741 1,253 154,762 156,015 Total commercial - industrial, financial and agricultural 15,037 2,411 428 43,617 44,045 61,493 4,203,109 4,264,602 Real estate - home equity 8,053 1,650 2,885 8,801 11,686 21,389 1,470,006 1,491,395 Real estate - residential mortgage 15,333 5,499 4,619 14,269 18,888 39,720 2,054,810 2,094,530 Construction - commercial residential 560 184 — 8,810 8,810 9,554 133,511 143,065 Construction - commercial — — — 19 19 19 768,628 768,647 Construction - other — — 198 292 490 490 78,503 78,993 Total real estate - construction 560 184 198 9,121 9,319 10,063 980,642 990,705 Consumer - direct 45 63 83 — 83 191 62,142 62,333 Consumer - indirect 2,535 492 269 — 269 3,296 294,686 297,982 Total consumer 2,580 555 352 — 352 3,487 356,828 360,315 Leasing, other and overdrafts 805 244 176 — 176 1,225 285,722 286,947 Total $ 50,905 $ 11,504 $ 12,628 $ 111,116 $ 123,744 $ 186,153 $ 15,606,816 $ 15,792,969 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: June 30, December 31, (in thousands) Real-estate - residential mortgage $ 25,055 $ 26,016 Real-estate - commercial mortgage 16,420 13,959 Real estate - home equity 16,201 15,558 Commercial 11,199 10,820 Consumer 11 26 Total accruing TDRs 68,886 66,379 Non-accrual TDRs (1) 24,743 29,051 Total TDRs $ 93,629 $ 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, as of June 30, 2018 and 2017 that were modified in the previous 12 months and had a post-modification payment default during the six months ended June 30, 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 8 $ 863 7 $ 1,911 Real estate - commercial mortgage 1 176 3 674 Real estate - home equity 29 1,955 16 922 Commercial 5 146 5 2,772 Consumer — — 1 16 Total 43 $ 3,140 32 $ 6,295 The following table presents TDRs, by class segment and type of concession for loans that were modified during the three and six months ended June 30, 2018 and 2017 : Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 Number of Loans Post-Modification Recorded Investment Number of Loans Post-Modification Recorded Investment 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 1 $ 77 — $ — 1 $ 77 2 $ 337 Bankruptcy — — 1 157 1 5 2 335 Real estate - commercial mortgage: Extend maturity without rate concession 1 4 3 663 6 8,261 4 981 Bankruptcy — — 1 12 — — 1 12 Real estate - home equity: Extend maturity without rate concession 23 1,346 17 1,275 40 2,622 33 2,559 Bankruptcy 5 313 10 1,063 7 421 17 1,516 Commercial: Extend maturity without rate concession 1 49 5 2,600 5 1,151 8 5,693 Bankruptcy — — 1 490 — — 2 523 Construction - commercial residential: Extend maturity without rate concession — — 1 1,204 — — 1 1,204 Total 31 $ 1,789 39 $ 7,464 60 $ 12,537 70 $ 13,160

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Amortized cost: Balance at beginning of period $ 37,748 $ 38,543 $ 37,663 $ 38,822 Originations of mortgage servicing rights 1,746 1,203 3,229 2,386 Amortization (1,600 ) (1,566 ) (2,998 ) (3,028 ) Balance at end of period $ 37,894 $ 38,180 $ 37,894 $ 38,180 Valuation allowance: Balance at beginning of period $ — $ (1,291 ) $ — $ (1,291 ) Reductions to valuation allowance — 1,291 — 1,291 Balance at end of period $ — $ — $ — $ — Net MSRs at end of period $ 37,894 $ 38,180 $ 37,894 $ 38,180

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Compensation expense $ 2,674 $ 1,035 $ 4,184 $ 1,769 Tax benefit (1,075 ) (1,940 ) (1,536 ) (2,684 ) Stock-based compensation expense, net of tax benefit $ 1,599 $ (905 ) $ 2,648 $ (915 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 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 components: Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest cost $ 12 $ 17 $ 29 $ 34 Net accretion and deferral (139 ) (141 ) (280 ) (282 ) Net periodic benefit $ (127 ) $ (124 ) $ (251 ) $ (248 ) The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest cost $ 696 $ 830 1,527 1,660 Expected return on plan assets (573 ) (451 ) (1,024 ) (902 ) Net amortization and deferral 551 663 1,215 1,326 Net periodic pension cost $ 674 $ 1,042 $ 1,718 $ 2,084

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2018 December 31, 2017 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 158,905 $ 1,425 $ 129,469 $ 1,059 Negative fair values 8,765 (65 ) 8,957 (59 ) Net interest rate locks with customers 1,360 1,000 Forward Commitments Positive fair values 12,829 5 3,856 34 Negative fair values 114,774 (499 ) 100,808 (213 ) Net forward commitments (494 ) (179 ) Interest Rate Swaps with Customers Positive fair values 431,935 7,903 1,316,548 24,505 Negative fair values 1,802,086 (57,393 ) 716,634 (18,978 ) Net interest rate swaps with customers (49,490 ) 5,527 Interest Rate Swaps with Dealer Counterparties Positive fair values (1) (3) 1,802,086 48,518 716,634 18,941 Negative fair values (2) (3) 431,935 (4,716 ) 1,316,548 (19,764 ) Net interest rate swaps with dealer counterparties 43,802 (823 ) Foreign Exchange Contracts with Customers Positive fair values 10,564 335 4,852 276 Negative fair values 6,758 (194 ) 5,914 (119 ) Net foreign exchange contracts with customers 141 157 Foreign Exchange Contracts with Correspondent Banks Positive fair values 9,397 296 7,960 184 Negative fair values 12,147 (329 ) 6,048 (255 ) Net foreign exchange contracts with correspondent banks (33 ) (71 ) Net derivative fair value asset $ (4,714 ) $ 5,611 (1) Includes centrally cleared interest rate swaps with a notional amount of $399.3 million and a fair value of $0 as of June 30, 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 $158.8 million and a fair value of $0 as of June 30, 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 $5.8 million at June 30, 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 June 30 Six months ended June 30 2018 2017 2018 2017 (in thousands) Interest rate locks with customers $ 231 $ (155 ) $ 360 $ 690 Forward commitments (541 ) 157 (315 ) (2,222 ) Interest rate swaps with customers (12,375 ) 13,809 (55,017 ) 12,994 Interest rate swaps with dealer counterparties (1) 10,811 (10,831 ) 44,625 (7,830 ) Foreign exchange contracts with customers (23 ) (325 ) (16 ) (317 ) Foreign exchange contracts with correspondent banks (50 ) 367 38 330 Net fair value (losses) gains on derivative financial instruments $ (1,947 ) $ 3,022 $ (10,325 ) $ 3,645 (1) Not included is $1.6 million and $10.4 million , respectively, of gains representing the change in the variation margin for the three and six months ended June 30, 2018 and $2.9 million and $5.1 million , respectively, of losses representing the change in the variation margin for the three and six months ended June 30, 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: June 30, December 31, (in thousands) Cost (1) $ 35,310 $ 31,069 Fair value 35,898 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) June 30, 2018 Interest rate swap derivative assets $ 56,421 $ (5,916 ) $ (44,080 ) $ 6,425 Foreign exchange derivative assets with correspondent banks 296 (296 ) — — Total $ 56,717 $ (6,212 ) $ (44,080 ) $ 6,425 Interest rate swap derivative liabilities $ 62,109 $ (5,916 ) $ (13,177 ) $ 43,016 Foreign exchange derivative liabilities with correspondent banks 329 (296 ) — 33 Total $ 62,438 $ (6,212 ) $ (13,177 ) $ 43,049 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) June 30, 2018 Interest rate swap derivative assets $ 56,421 $ (5,916 ) $ (44,080 ) $ 6,425 Foreign exchange derivative assets with correspondent banks 296 (296 ) — — Total $ 56,717 $ (6,212 ) $ (44,080 ) $ 6,425 Interest rate swap derivative liabilities $ 62,109 $ (5,916 ) $ (13,177 ) $ 43,016 Foreign exchange derivative liabilities with correspondent banks 329 (296 ) — 33 Total $ 62,438 $ (6,212 ) $ (13,177 ) $ 43,049 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)	6 Months Ended
	Jun. 30, 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: June 30, December 31, 2017 (in thousands) Commitments to extend credit $ 6,498,732 $ 6,205,029 Standby letters of credit 321,372 326,973 Commercial letters of credit 42,018 41,801

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2018 Level 1 Level 2 Level 3 Total (in thousands) Mortgage loans held for sale $ — $ 35,898 $ — $ 35,898 Available for sale investment securities: U.S. Government sponsored agency securities — 26,526 — 26,526 State and municipal securities — 407,696 — 407,696 Corporate debt securities — 87,795 4,075 91,870 Collateralized mortgage obligations — 724,322 — 724,322 Residential mortgage-backed securities — 1,000,964 — 1,000,964 Commercial mortgage-backed securities — 238,783 — 238,783 Auction rate securities — — 103,122 103,122 Total available for sale investment securities — 2,486,086 107,197 2,593,283 Investments held in Rabbi Trust 19,510 — — 19,510 Other assets 639 57,851 — 58,490 Total assets $ 20,149 $ 2,579,835 $ 107,197 $ 2,707,181 Other liabilities $ 20,034 $ 62,673 $ — $ 82,707 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 Investments held in Rabbi Trust 18,982 — — 18,982 Other assets 469 44,539 — 45,008 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 June 30, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at March 31, 2018 $ 865 $ 3,095 $ 103,049 Unrealized adjustment to fair value (1) 10 102 73 Discount accretion (2) — 3 — Balance at June 30, 2018 $ 875 $ 3,200 $ 103,122 Three months ended June 30, 2017 Balance at March 31, 2017 $ 422 $ 2,750 $ 97,439 Unrealized adjustment to fair value (1) — 22 386 Discount accretion (2) — 3 98 Balance at June 30, 2017 $ 422 $ 2,775 $ 97,923 Six months ended June 30, 2018 Pooled Trust Single-issuer ARCs (in thousands) Balance at December 31, 2017 $ 707 $ 3,050 $ 98,668 Unrealized adjustment to fair value (1) 168 144 4,454 Discount accretion (2) — 6 — Balance at June 30, 2018 $ 875 $ 3,200 $ 103,122 Six months ended June 30, 2017 Balance at December 31, 2016 $ 422 $ 2,450 $ 97,256 Unrealized adjustment to fair value (1) — 319 472 Discount accretion (2) — 6 195 Balance at June 30, 2017 $ 422 $ 2,775 $ 97,923 (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: June 30, 2018 December 31, 2017 (in thousands) Net loans $ 141,072 $ 149,608 OREO 11,181 9,823 MSRs 37,894 37,663 Total assets $ 190,147 $ 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 June 30, 2018 and December 31, 2017 . In addition, a general description of the methods and assumptions used to estimate such fair values is also provided. June 30, 2018 Amortized Cost Level 1 Level 2 Level 3 Estimated (in thousands) FINANCIAL ASSETS Cash and due from banks $ 99,742 $ 99,742 $ — $ — $ 99,742 Interest-bearing deposits with other banks 298,087 298,087 — — 298,087 Federal Reserve Bank and Federal Home Loan Bank stock 66,715 — 66,715 — 66,715 Loans held for sale 35,898 — 35,898 — 35,898 Available for sale investment securities 2,593,283 — 2,486,086 107,197 2,593,283 Net Loans 15,636,919 — — 14,996,906 14,996,906 Accrued interest receivable 55,208 55,208 — — 55,208 Other financial assets 229,475 122,547 57,851 49,077 229,475 FINANCIAL LIABILITIES Demand and savings deposits $ 12,776,849 $ 12,776,849 $ — $ — $ 12,776,849 Brokered deposits 161,447 161,447 — — 161,447 Time deposits 2,661,503 — 2,656,421 — 2,656,421 Short-term borrowings 983,833 983,833 — — 983,833 Accrued interest payable 8,293 8,293 — — 8,293 Other financial liabilities 251,170 188,497 62,673 — 251,170 Federal Home Loan Bank advances and long-term debt 991,948 — 964,318 — 964,318 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	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects	[1]		$ 0
Decrease in net cash flows used in investing activities			217,199	$ 656,240
Increase in net cash provided by operating activities			$ 134,834	87,689
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects		$ 7,100
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in net cash flows used in investing activities				12,700
Increase in net cash provided by operating activities				$ 12,700
[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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding (basic) (in shares)	175,764	174,597	175,535	174,375
Impact of common stock equivalents (in shares)	1,080	935	1,171	1,179
Weighted average shares outstanding (diluted) (in shares)	176,844	175,532	176,706	175,554

Accumulated Other Comprehensi33

Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Unrealized gain on securities, before tax amount	$ (8,397)	$ 15,798	$ (43,388)	$ 22,374
Unrealized gain on securities, tax effect	1,766	(5,530)	9,113	(7,833)
Unrealized gain on securities, net of tax amount	(6,631)	10,268	(34,275)	14,541
Reclassification adjustment for securities gains included in net income, before tax amount	(4)	(1,436)	(23)	(2,542)
Reclassification adjustment for securities gains included in net income, tax effect	1	504	4	891
Reclassification adjustment for securities gains included in net income, net of tax amount	(3)	(932)	(19)	(1,651)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount	9		294
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect	(1)		(62)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount	(8)	0	(232)	0
Amortization of net unrecognized pension and postretirement items, before tax amount	683	522	1,113	1,051
Amortization of net unrecognized pension and postretirement items, tax effect	(143)	(181)	(234)	(367)
Amortization of net unrecognized pension and postretirement items, net of tax amount	540	341	879	684
Total Other Comprehensive Income, Before Tax Amount	(7,709)	14,884	(42,004)	20,883
Total Other Comprehensive Income, Tax Effect	1,623	(5,207)	8,821	(7,309)
Other Comprehensive (Loss) Income	$ (6,086)	$ 9,677	$ (33,183)	$ 13,574

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance			$ (32,974)
Ending Balance	$ (73,258)		(73,258)
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(50,056)	$ (19,493)	(18,509)	$ (23,047)
Other comprehensive loss before reclassifications	(6,631)	10,268	(34,275)	14,541
Amounts reclassified from accumulated other comprehensive income (loss)	(3)	(932)	(19)	(1,651)
Ending Balance	(56,690)	(10,157)	(56,690)	(10,157)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	682	273	458	273
Other comprehensive loss before reclassifications	8	0	232	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Ending Balance	690	273	690	273
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(17,798)	(15,332)	(14,923)	(15,675)
Other comprehensive loss before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	540	341	879	684
Ending Balance	(17,258)	(14,991)	(17,258)	(14,991)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(67,172)	(34,552)	(32,974)	(38,449)
Other comprehensive loss before reclassifications	(6,623)	10,268	(34,043)	14,541
Amounts reclassified from accumulated other comprehensive income (loss)	537	(591)	860	(967)
Ending Balance	$ (73,258)	$ (24,875)	(73,258)	$ (24,875)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)			3,887
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)			0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)			3,214
Reclassification out of Accumulated Other Comprehensive Income [Member] | Total
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)			$ 7,101

Investment Securities Schedule

Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 1,500,000	$ 1,800,000
Amortized Cost	2,664,163	2,575,719
Gross Unrealized Gains	6,149	13,062
Gross Unrealized Losses	(77,029)	(40,825)
Estimated Fair Value	2,593,283	2,547,956
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,830	5,962
Gross Unrealized Gains	5	2
Gross Unrealized Losses	(309)	(26)
Estimated Fair Value	26,526	5,938
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	415,460	405,860
Gross Unrealized Gains	2,101	5,638
Gross Unrealized Losses	(9,865)	(2,549)
Estimated Fair Value	407,696	408,949
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	92,411	96,353
Gross Unrealized Gains	1,261	2,832
Gross Unrealized Losses	(1,802)	(1,876)
Estimated Fair Value	91,870	97,309
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	742,282	611,927
Gross Unrealized Gains	406	491
Gross Unrealized Losses	(18,366)	(9,795)
Estimated Fair Value	724,322	602,623
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,035,724	1,132,080
Gross Unrealized Gains	2,342	3,957
Gross Unrealized Losses	(37,102)	(15,241)
Estimated Fair Value	1,000,964	1,120,796
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	244,046	215,351
Gross Unrealized Gains	34	0
Gross Unrealized Losses	(5,297)	(2,596)
Estimated Fair Value	238,783	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	(4,288)	(8,742)
Estimated Fair Value	103,122	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	Jun. 30, 2018USD ($)
Amortized Cost
Due in one year or less	$ 7,305
Due from one year to five years	44,956
Due from five years to ten years	109,639
Due after ten years	480,211
Amortized cost, before securities without debt maturities	642,111
Amortized Cost	2,664,163
Estimated Fair Value
Due in one year or less	7,313
Due from one year to five years	44,959
Due from five years to ten years	109,503
Due after ten years	467,439
Available for sale securities, debt maturities, before securities without single maturities	629,214
Estimated Fair Value	2,593,283
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	742,282
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	724,322
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	244,046
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	238,783
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	1,035,724
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	$ 1,000,964

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	$ 1,530	$ 1,450	$ 1,549	$ 2,556
Gross Realized Losses	(1,526)	(14)	(1,526)	(14)
Net Gains (Losses)	4	1,436	23	2,542
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	0	1,305	9	2,350
Gross Realized Losses	0	0	0	0
Net Gains (Losses)	0	1,305	9	2,350
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	1,530	145	1,540	206
Gross Realized Losses	(1,526)	(14)	(1,526)	(14)
Net Gains (Losses)	$ 4	$ 131	$ 14	$ 192

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	Jun. 30, 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	$ 24,028	$ 5,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(309)	(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	24,028	5,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(309)	(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	166,323	11,650
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,264)	(50)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	113,946	118,297
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(6,601)	(2,499)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	280,269	129,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(9,865)	(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	35,112	4,544
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(220)	(48)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,554	32,163
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,582)	(1,828)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	57,666	36,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,802)	(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	529,808	303,932
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(10,258)	(2,408)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	136,723	187,690
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(8,108)	(7,387)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	666,531	491,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(18,366)	(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	501,230	511,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(15,521)	(4,348)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	450,713	500,375
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(21,581)	(10,893)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	951,943	1,011,753
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(37,102)	(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	182,155	190,985
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,903)	(2,118)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	45,352	21,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,394)	(478)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	227,507	212,755
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(5,297)	(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	103,122	98,668
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,288)	(8,742)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	103,122	98,668
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(4,288)	(8,742)
Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,438,656	1,028,319
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(33,475)	(8,998)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	872,410	958,963
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(43,554)	(31,827)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,311,066	1,987,282
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (77,029)	$ (40,825)

Investment Securities Summary39

Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,664,163
Corporate debt securities	2,593,283
Corporate Debt Securities Issued by Financial Institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	88,455	$ 92,379
Corporate debt securities	87,914	93,335
Single-issuer Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,779	31,335
Corporate debt securities	20,396	30,703
Subordinated Debt
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,649	49,013
Corporate debt securities	54,534	49,533
Senior Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,027	12,031
Corporate debt securities	12,109	12,392
Pooled Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	0
Corporate debt securities	875	707
Other Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,956	3,974
Corporate debt securities	3,956	3,974
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	92,411	96,353
Corporate debt securities	$ 91,870	$ 97,309

Investment Securities Narrative

Investment Securities Narrative (Details) $ in Thousands	Aug. 01, 2018USD ($)	Jun. 30, 2018USD ($)security	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)
Schedule of Investments [Line Items]
Securities pledged as collateral		$ 1,500,000	$ 1,800,000
Amortized cost		2,664,163	2,575,719
Available-for-sale Securities, Fair Value Disclosure		2,593,283	2,547,956
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		1,035,724	1,132,080
Available-for-sale Securities, Fair Value Disclosure		1,000,964	1,120,796
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		415,460	405,860
Available-for-sale Securities, Fair Value Disclosure		407,696	408,949
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		$ 1,383
Number of Trust Preferred Securities | security		11
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		$ 3,200
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		$ 2,000
Available-for-sale Securities, Fair Value Disclosure		$ 1,900
Number of Trust Preferred Securities | security		2
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
Subsequent Event [Member]
Schedule of Investments [Line Items]
Debt securities held-to-maturity, fair value	$ 641,700
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost	665,500
Subsequent Event [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt securities held-to-maturity, fair value	485,300
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost	505,500
Subsequent Event [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt securities held-to-maturity, fair value	156,400
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost	$ 160,000

Loans and Allowance for Credi41

Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	$ 15,823,043	$ 15,795,918
Deferred Revenue	30,074	27,671
Loans, net of unearned income	15,792,969	15,768,247	$ 15,346,617
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	6,304,475	6,364,804
Loans, net of unearned income	6,304,475	6,364,804	6,262,008
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	4,264,602	4,300,297
Loans, net of unearned income	4,264,602	4,300,297	4,245,849
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	1,491,395	1,559,719
Loans, net of unearned income	1,491,395	1,559,719	1,579,739
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	2,094,530	1,954,711
Loans, net of unearned income	2,094,530	1,954,711	1,784,712
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	990,705	1,006,935
Loans, net of unearned income	990,705	1,006,935	938,900
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	360,315	313,783
Loans, net of unearned income	360,315	313,783	$ 283,156
Leasing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	315,243	291,556
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross of unearned income	$ 1,778	$ 4,113

Loans and Allowance for Credi42

Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Allowance for loan losses	$ 156,050	$ 163,217	$ 169,910	$ 172,342	$ 170,076	$ 168,679
Reserve for unfunded lending commitments	13,197		6,174
Allowance for credit losses	$ 169,247	$ 176,019	$ 176,084	$ 174,998	$ 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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 176,019	$ 172,647	$ 176,084	$ 171,325
Loans charged off	(42,160)	(8,715)	(48,557)	(18,122)
Recoveries of loans previously charged off	2,271	4,366	4,633	10,295
Net loans charged off	(39,889)	(4,349)	(43,924)	(7,827)
Provision for credit losses	33,117	6,700	37,087	11,500
Balance at end of period	$ 169,247	$ 174,998	$ 169,247	$ 174,998

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 163,217	$ 170,076	$ 169,910	$ 168,679
Loans charged off	(42,160)	(8,715)	(48,557)	(18,122)
Recoveries of loans previously charged off	2,271	4,366	4,633	10,295
Net loans charged off	(39,889)	(4,349)	(43,924)	(7,827)
Provision for loan losses	32,722	6,615	30,064	11,490
Ending Balance	156,050	172,342	156,050	172,342
Provision for loan losses gross	400	100	7,000	0
Provision for credit losses	33,117	6,700	37,087	11,500
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	58,717	47,373	58,793	46,842
Loans charged off	(366)	(242)	(633)	(1,466)
Recoveries of loans previously charged off	321	934	600	1,384
Net loans charged off	(45)	692	(33)	(82)
Provision for loan losses	(2,089)	9,307	(2,177)	10,612
Ending Balance	56,583	57,372	56,583	57,372
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	61,830	55,309	66,280	54,353
Loans charged off	(38,632)	(5,353)	(42,637)	(10,880)
Recoveries of loans previously charged off	541	1,974	1,616	6,165
Net loans charged off	(38,091)	(3,379)	(41,021)	(4,715)
Provision for loan losses	35,306	15,712	33,786	18,004
Ending Balance	59,045	67,642	59,045	67,642
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	17,528	23,821	18,127	26,801
Loans charged off	(816)	(592)	(1,224)	(1,290)
Recoveries of loans previously charged off	271	215	477	352
Net loans charged off	(545)	(377)	(747)	(938)
Provision for loan losses	(736)	(5,988)	(1,133)	(8,407)
Ending Balance	16,247	17,456	16,247	17,456
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	15,261	22,018	16,088	22,929
Loans charged off	(483)	(124)	(645)	(340)
Recoveries of loans previously charged off	96	151	203	381
Net loans charged off	(387)	27	(442)	41
Provision for loan losses	(370)	(5,606)	(1,142)	(6,531)
Ending Balance	14,504	16,439	14,504	16,439
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	5,924	7,501	6,620	6,455
Loans charged off	(606)	(774)	(764)	(1,021)
Recoveries of loans previously charged off	444	373	750	921
Net loans charged off	(162)	(401)	(14)	(100)
Provision for loan losses	226	2,434	(618)	3,179
Ending Balance	5,988	9,534	5,988	9,534
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	1,903	3,031	2,045	3,574
Loans charged off	(712)	(430)	(1,604)	(1,286)
Recoveries of loans previously charged off	446	470	625	706
Net loans charged off	(266)	40	(979)	(580)
Provision for loan losses	62	(1,277)	633	(1,200)
Ending Balance	1,699	1,794	1,699	1,794
Leasing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	2,054	3,268	1,957	3,192
Loans charged off	(545)	(1,200)	(1,050)	(1,839)
Recoveries of loans previously charged off	152	249	362	386
Net loans charged off	(393)	(951)	(688)	(1,453)
Provision for loan losses	323	(212)	715	366
Ending Balance	1,984	2,105	1,984	2,105
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	0	7,755	0	4,533
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Net loans charged off	0	0	0	0
Provision for loan losses	0	(7,755)	0	(4,533)
Ending Balance	$ 0	$ 0	$ 0	$ 0

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	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	$ 117,120			$ 129,264
Loans individually evaluated for impairment	38,930			43,078
Allowance for loan losses	156,050	$ 163,217	$ 169,910	172,342	$ 170,076	$ 168,679
Loans collectively evaluated for impairment	15,612,967			15,159,282
Loans individually evaluated for impairment	180,002			187,335
Loans, net of unearned income	15,792,969		15,768,247	15,346,617
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	48,489			49,055
Loans individually evaluated for impairment	8,094			8,317
Allowance for loan losses	56,583	58,717	58,793	57,372	47,373	46,842
Loans collectively evaluated for impairment	6,252,747			6,212,998
Loans individually evaluated for impairment	51,728			49,010
Loans, net of unearned income	6,304,475		6,364,804	6,262,008
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	49,354			57,341
Loans individually evaluated for impairment	9,691			10,301
Allowance for loan losses	59,045	61,830	66,280	67,642	55,309	54,353
Loans collectively evaluated for impairment	4,209,786			4,189,676
Loans individually evaluated for impairment	54,816			56,173
Loans, net of unearned income	4,264,602		4,300,297	4,245,849
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	5,093			7,607
Loans individually evaluated for impairment	11,154			9,849
Allowance for loan losses	16,247	17,528	18,127	17,456	23,821	26,801
Loans collectively evaluated for impairment	1,466,393			1,557,989
Loans individually evaluated for impairment	25,002			21,750
Loans, net of unearned income	1,491,395		1,559,719	1,579,739
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	5,171			6,013
Loans individually evaluated for impairment	9,333			10,426
Allowance for loan losses	14,504	15,261	16,088	16,439	22,018	22,929
Loans collectively evaluated for impairment	2,055,206			1,741,404
Loans individually evaluated for impairment	39,324			43,308
Loans, net of unearned income	2,094,530		1,954,711	1,784,712
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	5,338			5,370
Loans individually evaluated for impairment	650			4,164
Allowance for loan losses	5,988	5,924	6,620	9,534	7,501	6,455
Loans collectively evaluated for impairment	981,584			921,839
Loans individually evaluated for impairment	9,121			17,061
Loans, net of unearned income	990,705		1,006,935	938,900
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	1,691			1,773
Loans individually evaluated for impairment	8			21
Allowance for loan losses	1,699	1,903	2,045	1,794	3,031	3,574
Loans collectively evaluated for impairment	360,304			283,123
Loans individually evaluated for impairment	11			33
Loans, net of unearned income	360,315		313,783	283,156
Leasing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans collectively evaluated for impairment	1,984			2,105
Loans individually evaluated for impairment	0			0
Allowance for loan losses	1,984	2,054	1,957	2,105	3,268	3,192
Loans collectively evaluated for impairment	286,947			252,253
Loans individually evaluated for impairment	0			0
Loans, net of unearned income	286,947		267,998	252,253
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0	$ 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	Jun. 30, 2018	Dec. 31, 2017
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	$ 83,908	$ 88,716
Unpaid principal balance, with related allowance	158,573	141,739
Unpaid Principal Balance	242,481	230,455
Recorded investment, with no related allowance	63,602	75,111
Recorded investment, with related allowance	116,400	116,018
Recorded Investment	180,002	191,129
Related Allowance	38,930	41,521
Real-estate - commercial mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	27,582	26,728
Unpaid principal balance, with related allowance	32,432	33,710
Recorded investment, with no related allowance	26,435	22,886
Recorded investment, with related allowance	25,293	25,895
Related Allowance	8,094	8,112
Commercial
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	41,971	44,936
Unpaid principal balance, with related allowance	50,734	29,816
Recorded investment, with no related allowance	26,761	39,550
Recorded investment, with related allowance	28,055	24,175
Related Allowance	9,691	11,406
Real estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	3,193	4,575
Unpaid principal balance, with related allowance	41,025	42,597
Recorded investment, with no related allowance	3,193	4,575
Recorded investment, with related allowance	36,131	37,132
Related Allowance	9,333	9,895
Construction
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	11,162	12,477
Unpaid principal balance, with related allowance	5,595	7,308
Recorded investment, with no related allowance	7,213	8,100
Recorded investment, with related allowance	1,908	4,097
Related Allowance	650	967
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	28,776	28,282
Recorded investment, with related allowance	25,002	24,693
Related Allowance	11,154	11,124
Consumer
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	11	26
Recorded investment, with related allowance	11	26
Related Allowance	$ 8	$ 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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 72,169	$ 64,753	$ 73,148	$ 63,321
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	190	147	373	281
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	115,125	117,431	115,421	118,503
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	563	465	1,095	910
Impaired Financing Receivable, Average Recorded Investment	187,294	182,184	188,569	181,824
Impaired Financing Receivable, Interest Income, Accrual Method	753	612	1,468	1,191
Real-estate - commercial mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27,127	22,316	25,713	23,360
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	97	71	180	141
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25,419	27,710	25,578	28,288
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	91	88	175	173
Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	33,644	30,829	35,612	29,061
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	69	46	142	82
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	26,120	21,387	25,471	22,074
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	54	31	97	63
Real-estate - home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,907	20,352	24,835	19,969
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	195	117	379	212
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,870	4,643	4,105	4,658
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	24	26	51	52
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	36,261	39,500	36,551	40,119
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	223	225	444	455
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,528	6,965	7,718	6,242
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	4	0	6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,400	8,446	2,966	7,542
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	4	0	7
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	18	36	20	36
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Leasing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	475
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0

Loans and Allowance for Credi48

Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 15,823,043	$ 15,795,918
Real-estate - commercial mortgage
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	6,304,475	6,364,804
Real-estate - commercial mortgage | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	5,990,838	6,066,396
Real-estate - commercial mortgage | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	164,908	147,604
Real-estate - commercial mortgage | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	148,729	150,804
Commercial
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,108,587	4,132,440
Commercial | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,823,052	3,831,485
Commercial | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	139,345	121,842
Commercial | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	146,190	179,113
Commercial - unsecured
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	156,015	167,857
Commercial - unsecured | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	147,914	159,620
Commercial - unsecured | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,726	5,478
Commercial - unsecured | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,375	2,759
Commercial - industrial, financial and agricultural
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,264,602	4,300,297
Commercial - industrial, financial and agricultural | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,970,966	3,991,105
Commercial - industrial, financial and agricultural | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	143,071	127,320
Commercial - industrial, financial and agricultural | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	150,565	181,872
Construction
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	143,066	163,102
Construction | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	128,641	143,759
Construction | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	3,996	5,259
Construction | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	10,429	14,084
Construction - commercial
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	768,646	765,816
Construction - commercial | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	762,920	761,218
Construction - commercial | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	344	846
Construction - commercial | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	5,382	3,752
Construction - Commercial and Commercial Residential
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	911,712	928,918
Construction - Commercial and Commercial Residential | Pass
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	891,561	904,977
Construction - Commercial and Commercial Residential | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	4,340	6,105
Construction - Commercial and Commercial Residential | December 31, 2017
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	15,811	17,836
Commercial Loans, Commerical Mortgages, Constructions Loans
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 11,480,789	$ 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	$ 10,853,365	$ 10,962,478
Percentage of total loans rated	94.50%	94.60%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention
Internal risk ratings for loans by segment [Line Items]
Loans and Leases Receivable, Gross	$ 312,319	$ 281,029
Percentage of total loans rated	2.70%	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	$ 315,105	$ 350,512
Percentage of total loans rated	2.70%	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	6 Months Ended
	Jun. 30, 2018USD ($)day	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	$ 15,792,969	$ 15,768,247	$ 15,346,617
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	$ 1,491,395	1,559,719	1,579,739
Real-estate - home equity | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	1,470,006	1,535,557
Real-estate - home equity | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	9,703	12,655
Real-estate - home equity | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	11,686	11,507
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	2,094,530	1,954,711	1,784,712
Real estate - residential mortgage | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	2,054,810	1,914,888
Real estate - residential mortgage | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	20,832	18,852
Real estate - residential mortgage | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	18,888	20,971
Construction - other
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	78,993	78,017
Construction - other | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	78,503	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	62,333	55,213
Consumer | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	62,142	54,828
Consumer | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	108	315
Consumer | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	83	70
Consumer - indirect
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	297,982	258,570
Consumer - indirect | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	294,686	254,663
Consumer - indirect | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	3,027	3,681
Consumer - indirect | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	269	226
Consumer
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	360,315	313,783	283,156
Consumer | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	356,828	309,491
Consumer | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	3,135	3,996
Consumer | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	352	296
Leasing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	286,947	267,998	$ 252,253
Leasing, other and overdrafts | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	285,722	267,111
Leasing, other and overdrafts | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	1,049	855
Leasing, other and overdrafts | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	176	32
Real Estate, Consumer, Leasing And Other Loans [Member] [Member]
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	4,312,180	4,174,228
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	4,245,869	4,104,450
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Delinquent
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	34,719	36,561
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Non-performing
Financing Receivable, Impaired [Line Items]
Loans, net of unearned income	$ 31,592	$ 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	0.80%	0.90%
Commercial Loans, Commerical Mortgages, Constructions Loans | Non-performing
Financing Receivable, Impaired [Line Items]
% of Total	0.70%	0.80%

Loans and Allowance for Credi50

Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Non-accrual loans	$ 111,116	$ 124,749
Loans 90 days or more past due and still accruing	12,628	10,010
Total non-performing loans	123,744	134,759
Other real estate owned (OREO)	11,181	9,823
Total non-performing assets	$ 134,925	$ 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	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 186,153	$ 196,268
≥ 90 Days Past Due and Accruing	12,628	10,010
Non- accrual	111,116	124,749
Current	15,606,816	15,571,979
Loans, net of unearned income	15,792,969	15,768,247	$ 15,346,617
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	50,905	40,709
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,504	20,800
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	123,744	134,759
Real-estate - commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	48,776	49,126
≥ 90 Days Past Due and Accruing	3,970	625
Non- accrual	35,308	34,822
Current	6,255,699	6,315,678
Loans, net of unearned income	6,304,475	6,364,804	6,262,008
Real-estate - commercial mortgage | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,537	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	961	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	39,278	35,447
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60,240	63,647
≥ 90 Days Past Due and Accruing	299	1,360
Non- accrual	43,005	52,255
Current	4,048,347	4,068,793
Loans, net of unearned income	4,108,587	4,132,440
Commercial | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,687	4,778
Commercial | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,249	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	43,304	53,615
Commercial - unsecured
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,253	1,009
≥ 90 Days Past Due and Accruing	129	45
Non- accrual	612	649
Current	154,762	166,848
Loans, net of unearned income	156,015	167,857
Commercial - unsecured | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	350	305
Commercial - unsecured | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	162	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	741	694
Commercial - industrial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	61,493	64,656
≥ 90 Days Past Due and Accruing	428	1,405
Non- accrual	43,617	52,904
Current	4,203,109	4,235,641
Loans, net of unearned income	4,264,602	4,300,297	4,245,849
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	15,037	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	2,411	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	44,045	54,309
Real-estate - home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	21,389	24,162
≥ 90 Days Past Due and Accruing	2,885	2,372
Non- accrual	8,801	9,135
Current	1,470,006	1,535,557
Loans, net of unearned income	1,491,395	1,559,719	1,579,739
Real-estate - home equity | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,053	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	1,650	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	11,686	11,507
Real estate - residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	39,720	39,823
≥ 90 Days Past Due and Accruing	4,619	5,280
Non- accrual	14,269	15,691
Current	2,054,810	1,914,888
Loans, net of unearned income	2,094,530	1,954,711	1,784,712
Real estate - residential mortgage | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,333	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	5,499	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	18,888	20,971
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,554	12,206
≥ 90 Days Past Due and Accruing	0	0
Non- accrual	8,810	11,767
Current	133,511	150,896
Loans, net of unearned income	143,065	163,102
Construction | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	560	0
Construction | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	184	439
Construction | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,810	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	768,628	765,314
Loans, net of unearned income	768,647	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	78,503	77,403
Loans, net of unearned income	78,993	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	10,063	13,322
≥ 90 Days Past Due and Accruing	198	0
Non- accrual	9,121	12,197
Current	980,642	993,613
Loans, net of unearned income	990,705	1,006,935	938,900
Real-estate - construction | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	560	686
Real-estate - construction | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	184	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	9,319	12,197
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	191	385
≥ 90 Days Past Due and Accruing	83	70
Non- accrual	0	0
Current	62,142	54,828
Loans, net of unearned income	62,333	55,213
Consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	260
Consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	63	55
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	83	70
Consumer - indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,296	3,907
≥ 90 Days Past Due and Accruing	269	226
Non- accrual	0	0
Current	294,686	254,663
Loans, net of unearned income	297,982	258,570
Consumer - indirect | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,535	3,055
Consumer - indirect | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	492	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	269	226
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,487	4,292
≥ 90 Days Past Due and Accruing	352	296
Non- accrual	0	0
Current	356,828	309,491
Loans, net of unearned income	360,315	313,783	283,156
Consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,580	3,315
Consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	555	681
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	352	296
Leasing, other and overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,225	887
≥ 90 Days Past Due and Accruing	176	32
Non- accrual	0	0
Current	285,722	267,111
Loans, net of unearned income	286,947	267,998	$ 252,253
Leasing, other and overdrafts | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	805	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	244	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	$ 176	$ 32

Loans and Allowance for Credi52

Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	$ 68,886	$ 66,379
Non-accrual TDRs (1)	24,743	29,051
Total TDRs	93,629	95,430
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	25,055	26,016
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	16,420	13,959
Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	16,201	15,558
Commercial
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	11,199	10,820
Consumer
Financing Receivable, Modifications [Line Items]
Total Accruing Troubled Debt Restructurings	$ 11	$ 26

Loans and Allowance for Credi53

Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loans	Jun. 30, 2017USD ($)loans	Jun. 30, 2018USD ($)loans	Jun. 30, 2017USD ($)loans
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	31	39	60	70
Post-Modification Recorded Investment | $	$ 1,789	$ 7,464	$ 12,537	$ 13,160
Extend maturity without rate concession | Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	1	5	5	8
Post-Modification Recorded Investment | $	$ 49	$ 2,600	$ 1,151	$ 5,693
Extend maturity without rate concession | Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	1	3	6	4
Post-Modification Recorded Investment | $	$ 4	$ 663	$ 8,261	$ 981
Extend maturity without rate concession | Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	23	17	40	33
Post-Modification Recorded Investment | $	$ 1,346	$ 1,275	$ 2,622	$ 2,559
Extend maturity without rate concession | Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	1	0	1	2
Post-Modification Recorded Investment | $	$ 77	$ 0	$ 77	$ 337
Extend maturity without rate concession | Construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	1	0	1
Post-Modification Recorded Investment | $	$ 0	$ 1,204	$ 0	$ 1,204
Bankruptcy | Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	1	0	2
Post-Modification Recorded Investment | $	$ 0	$ 490	$ 0	$ 523
Bankruptcy | Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	1	0	1
Post-Modification Recorded Investment | $	$ 0	$ 12	$ 0	$ 12
Bankruptcy | Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	5	10	7	17
Post-Modification Recorded Investment | $	$ 313	$ 1,063	$ 421	$ 1,516
Bankruptcy | Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans	0	1	1	2
Post-Modification Recorded Investment | $	$ 0	$ 157	$ 5	$ 335

Loans and Allowance for Credi54

Loans and Allowance for Credit Losses TDRs by Class Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loans	Jun. 30, 2017USD ($)loans	Jun. 30, 2018USD ($)loans	Jun. 30, 2017USD ($)loans
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Investment	$ 1,789	$ 7,464	$ 12,537	$ 13,160
Number of Loans | loans	31	39	60	70
Number of Loans | loans			43	32
Recorded Investment			$ 3,140	$ 6,295
Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loans			8	7
Recorded Investment			$ 863	$ 1,911
Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans			1	3
Recorded Investment			$ 176	$ 674
Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loans			29	16
Recorded Investment			$ 1,955	$ 922
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | loans			5	5
Recorded Investment			$ 146	$ 2,772
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loans			0	1
Recorded Investment			$ 0	$ 16

Loans and Allowance for Credi55

Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	$ 33,117	$ 6,700	$ 37,087	$ 11,500
Loans charged off	$ 42,160	$ 8,715	$ 48,557	$ 18,122
Impaired loans with principal balances approximately in percentage			88.00%	87.00%
Loan to value ratio in the Corporation's policy	70.00%		70.00%
Recorded investment, with no related allowance	$ 63,602		$ 63,602		$ 75,111
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		1,000
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment			1,000
Commercial Relationship
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	36,800		36,800
Loans charged off	$ 33,900		$ 33,900

Mortgage Servicing Rights Summa

Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortized Cost:
Balance at beginning of period	$ 37,748	$ 38,543	$ 37,663	$ 38,822
Originations of mortgage servicing rights	1,746	1,203	3,229	2,386
Amortization	(1,600)	(1,566)	(2,998)	(3,028)
Balance at end of period	37,894	38,180	37,894	38,180
Valuation allowance:
Balance at beginning of period	0	(1,291)	0	(1,291)
Balance at end of period	0	0	0	0
Net MSRs at end of period	$ 37,894	$ 38,180	$ 37,894	$ 38,180

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Servicing Asset at Amortized Cost [Line Items]
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	$ 0	$ 1,291	$ 0	$ 1,291
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1,291	$ 1,291

Stock-Based Compensation Compen

Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation expense	$ 2,674	$ 1,035	$ 4,184	$ 1,769
Tax benefit	(1,075)	(1,940)	(1,536)	(2,684)
Stock-based compensation expense, net of tax benefit	$ 1,599	$ (905)	$ 2,648	$ (915)

Stock-Based Compensation Narrat

Stock-Based Compensation Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement [Line Items]
Compensation expense	$ 2,674	$ 1,035	$ 4,184	$ 1,769
Stock-based compensation expense, net of tax benefit	$ 1,599	$ (905)	$ 2,648	$ (915)
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	329		329
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	10,600		10,600

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 696	$ 830	$ 1,527	$ 1,660
Expected return on plan assets	(573)	(451)	(1,024)	(902)
Net amortization and deferral	551	663	1,215	1,326
Net periodic benefit	674	1,042	1,718	2,084
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	12	17	29	34
Net accretion and deferral	(139)	(141)	(280)	(282)
Net periodic benefit	$ (127)	$ (124)	$ (251)	$ (248)

Derivative Financial Instrume61

Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Assets	$ 20,172,539		$ 20,172,539		$ 20,036,905
Foreign currency open position	500		500
Mortgage Loans Held For Sale [Member]
Derivative [Line Items]
Gain (loss) in fair values of mortgage loans held for sale	$ 324	$ 26	$ 127	$ 565
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 ($)	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative asset, fair value	$ (56,717,000)	$ (43,630,000)
Derivative liability, fair value	(62,438,000)	(38,997,000)
Derivative asset (liability), net	(4,714,000)	5,611,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	158,905,000	129,469,000
Derivative liability, notional amount	8,765,000	8,957,000
Derivative asset, fair value	(1,425,000)	(1,059,000)
Derivative liability, fair value	(65,000)	(59,000)
Derivative asset (liability), net	1,360,000	1,000,000
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	12,829,000	3,856,000
Derivative liability, notional amount	114,774,000	100,808,000
Derivative asset, fair value	(5,000)	(34,000)
Derivative liability, fair value	(499,000)	(213,000)
Derivative asset (liability), net	(494,000)	(179,000)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	431,935,000	1,316,548,000
Derivative liability, notional amount	1,802,086,000	716,634,000
Derivative asset, fair value	(7,903,000)	(24,505,000)
Derivative liability, fair value	(57,393,000)	(18,978,000)
Derivative asset (liability), net	(49,490,000)	5,527,000
Interest Rate Swap With Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	1,802,086,000	716,634,000
Derivative liability, notional amount	431,935,000	1,316,548,000
Derivative asset, fair value	(48,518,000)	(18,941,000)
Derivative liability, fair value	(4,716,000)	(19,764,000)
Derivative asset (liability), net	43,802,000	(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	5,800,000
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	399,300,000	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	158,800,000	377,100,000
Derivative liability, fair value	0	0
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	10,564,000	4,852,000
Derivative liability, notional amount	6,758,000	5,914,000
Derivative asset, fair value	(335,000)	(276,000)
Derivative liability, fair value	(194,000)	(119,000)
Derivative asset (liability), net	141,000	157,000
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	9,397,000	7,960,000
Derivative liability, notional amount	12,147,000	6,048,000
Derivative asset, fair value	(296,000)	(184,000)
Derivative liability, fair value	(329,000)	(255,000)
Derivative asset (liability), net	$ (33,000)	$ (71,000)

Derivative Financial Instrume63

Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	$ (1,947)	$ 3,022	$ (10,325)	$ 3,645
Interest rate lock with customers [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	231	(155)	360	690
Forward Commitments [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	(541)	157	(315)	(2,222)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	(12,375)	13,809	(55,017)	12,994
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	10,811	(10,831)	44,625	(7,830)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	(23)	(325)	(16)	(317)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	(50)	367	38	330
Centrally Cleared Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Net fair value (losses) gains on derivative financial instruments	$ 1,600	$ 2,900	$ 10,400	$ 5,100

Derivative Financial Instrume64

Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	$ 35,898		$ 35,898		$ 31,530
Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	324	$ 26	127	$ 565
Cost [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	35,310		35,310		31,069
Fair value [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	$ 35,898		$ 35,898		$ 31,530

Derivative Financial Instrume65

Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 56,717	$ 43,630
Derivative, Collateral, Obligation to Return Securities	6,212	17,028
Derivative, Collateral, Obligation to Return Cash	(44,080)	0
Net Amount	6,425	26,602
Derivative liability, gross liability	62,438	38,997
Derivative liability, Collateral, Right to Reclaim Securities	(6,212)	(17,028)
Derivative liability, Collateral, Right to Reclaim Cash	(13,177)	(6,588)
Derivative liability, Net Amount	43,049	15,381
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	56,421	43,446
Derivative, Collateral, Obligation to Return Securities	5,916	16,844
Derivative, Collateral, Obligation to Return Cash	(44,080)	0
Net Amount	6,425	26,602
Derivative liability, gross liability	62,109	38,742
Derivative liability, Collateral, Right to Reclaim Securities	(5,916)	(16,844)
Derivative liability, Collateral, Right to Reclaim Cash	(13,177)	(6,588)
Derivative liability, Net Amount	43,016	15,310
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	296	184
Derivative, Collateral, Obligation to Return Securities	296	184
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	0	0
Derivative liability, gross liability	329	255
Derivative liability, Collateral, Right to Reclaim Securities	(296)	(184)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 33	$ 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	Jun. 30, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 6,498,732	$ 6,205,029
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	321,372	326,973
Commercial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 42,018	$ 41,801

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Outstanding repurchase request		$ 543
Reserve for Off-balance Sheet Activities [Member] | Residential Mortgage [Member]
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance	$ 1,900	$ 2,100

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,593,283
Available-for-sale Securities, Fair Value Disclosure	2,593,283	$ 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	35,898	31,530
Available-for-sale Securities, Fair Value Disclosure	2,593,283	2,547,956
Investments held in Rabbi Trust	19,510	18,982
Other assets	58,490	45,008
Assets, Fair Value Disclosure	2,707,181	2,643,476
Other liabilities	82,707	58,371
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	875	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	26,526	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	26,526	5,938
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	407,696	408,949
US States and Political Subdivisions 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	407,696	408,949
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	91,870	97,309
Available-for-sale Securities, Fair Value Disclosure	91,870	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	91,870	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	724,322	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	724,322	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	1,000,964	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	1,000,964	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	238,783	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	238,783	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	103,122	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	103,122	98,668
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	20,396	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]
Estimated Fair Value	20,400	30,700
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
Investments held in Rabbi Trust	19,510	18,982
Other assets	639	469
Assets, Fair Value Disclosure	20,149	20,369
Other liabilities	20,034	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] | US States and Political Subdivisions 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] | 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	35,898	31,530
Available-for-sale Securities, Fair Value Disclosure	2,486,086	2,444,613
Investments held in Rabbi Trust	0	0
Other assets	57,851	44,539
Assets, Fair Value Disclosure	2,579,835	2,520,682
Other liabilities	62,673	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	26,526	5,938
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions 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	407,696	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	87,795	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	724,322	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	1,000,964	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	238,783	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 2 [Member] | Single-issuer 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	17,200	27,700
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	107,197	102,425
Investments held in Rabbi Trust	0	0
Other assets	0	0
Assets, Fair Value Disclosure	107,197	102,425
Other liabilities	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	875	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] | US States and Political Subdivisions 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 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	4,075	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	103,122	98,668
Fair Value, Inputs, Level 3 [Member] | Single-issuer 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	$ 3,200	$ 3,100

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 865	$ 422	$ 707	$ 422
Unrealized adjustment to fair value	10	0	168	0
(Premium amortization) discount accretion	0	0	0	0
Balance, end of period	875	422	875	422
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3,095	2,750	3,050	2,450
Unrealized adjustment to fair value	102	22	144	319
(Premium amortization) discount accretion	3	3	6	6
Balance, end of period	3,200	2,775	3,200	2,775
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	103,049	97,439	98,668	97,256
Unrealized adjustment to fair value	73	386	4,454	472
(Premium amortization) discount accretion	0	98	0	195
Balance, end of period	$ 103,122	$ 97,923	$ 103,122	$ 97,923

Fair Value Measurements Asset70

Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 11,181	$ 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	141,072	149,608
OREO	11,181	9,823
MSRs	37,894	37,663
Assets, Fair Value Disclosure	$ 190,147	$ 197,094

Fair Value Measurements Details

Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Available for sale investment securities	$ 2,593,283,000	$ 2,547,956,000
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	99,742,000	108,291,000
Interest-bearing deposits with other banks	298,087,000	293,805,000
Federal Reserve Bank and Federal Home Loan Bank stock	66,715,000	60,761,000
Loans held for sale	35,898,000	31,530,000
Available for sale investment securities	2,593,283,000	2,547,956,000
Net Loans	15,636,919,000	15,598,337,000
Accrued interest receivable	55,208,000	52,910,000
Other financial assets	229,475,000	215,464,000
Demand and savings deposits	12,776,849,000	13,042,147,000
Brokered deposits	161,447,000	90,473,000
Time deposits	2,661,503,000	2,664,912,000
Short-term borrowings	983,833,000	617,524,000
Accrued interest payable	8,293,000	9,317,000
Other financial liabilities	251,170,000	227,569,000
Federal Home Loan Bank advances and long-term debt	991,948,000	1,038,346,000
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	99,742,000	108,291,000
Interest-bearing deposits with other banks	298,087,000	293,805,000
Federal Reserve Bank and Federal Home Loan Bank stock	66,715,000	60,761,000
Loans held for sale	35,898,000	31,530,000
Available for sale investment securities	2,593,283,000	2,547,956,000
Net Loans	14,996,906,000	15,380,974,000
Accrued interest receivable	55,208,000	52,910,000
Other financial assets	229,475,000	215,464,000
Demand and savings deposits	12,776,849,000	13,042,147,000
Brokered deposits	161,447,000	90,473,000
Time deposits	2,656,421,000	2,664,912,000
Short-term borrowings	983,833,000	617,524,000
Accrued interest payable	8,293,000	9,317,000
Other financial liabilities	251,170,000	227,569,000
Federal Home Loan Bank advances and long-term debt	964,318,000	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	99,742,000	108,291,000
Interest-bearing deposits with other banks	298,087,000	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	55,208,000	52,910,000
Other financial assets	122,547,000	123,439,000
Demand and savings deposits	12,776,849,000	13,042,147,000
Brokered deposits	161,447,000	90,473,000
Time deposits	0	0
Short-term borrowings	983,833,000	617,524,000
Accrued interest payable	8,293,000	9,317,000
Other financial liabilities	188,497,000	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	66,715,000	60,761,000
Loans held for sale	35,898,000	31,530,000
Available for sale investment securities	2,486,086,000	2,444,613,000
Net Loans	0	0
Accrued interest receivable	0	0
Other financial assets	57,851,000	44,539,000
Demand and savings deposits	0	0
Brokered deposits	0	0
Time deposits	2,656,421,000	2,664,912,000
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	62,673,000	39,014,000
Federal Home Loan Bank advances and long-term debt	964,318,000	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	107,197,000	102,425,000
Net Loans	14,996,906,000	15,380,974,000
Accrued interest receivable	0	0
Other financial assets	49,077,000	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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 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%	80.00%
Researched securities to reconcile the difference	5.00%	5.00%
Corporate debt securities	$ 2,593,283	$ 2,593,283
Significant input, assumed market return to liquidity (years)	5 years
Other real estate owned (OREO)	$ 11,181	$ 11,181	$ 9,823
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average annual constant prepayment rate		9.20%
Weighted average discount rate		9.00%
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	631	$ 631	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	19,500	19,500	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	523	523	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	1,400	1,400	1,100
Other financial liabilities	564	564	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	56,400	56,400	43,400
Other financial liabilities	62,100	62,100	38,700
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)	11,181	11,181	9,823
Net MSRs at end of period	37,894	37,894	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	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	20,396	20,396	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	20,400	20,400	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	17,200	17,200	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	3,200	3,200	3,100
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate debt securities	875	875	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	875	875	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	$ 4,000