Fulton Financial (FULT) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	0-10587
Entity Registrant Name	FULTON FINANCIAL CORP
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2195389
Entity Address, Address Line One	One Penn Square
Entity Address, City or Town	Lancaster,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17602
City Area Code	717
Local Phone Number	291-2411
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		162,606,000
Entity Central Index Key	0000700564
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock, par value $2.50
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $2.50
Trading Symbol	FULT
Security Exchange Name	NASDAQ
Depositary Shares, Each Representing 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	FULTP
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 102,570	$ 120,462
Interest-bearing deposits with other banks	1,559,306	1,727,370
Cash and cash equivalents	1,661,876	1,847,832
FRB and FHLB stock	66,209	92,129
Loans held for sale	34,092	83,886
AFS, at estimated fair value	2,758,597	3,062,143
HTM, at amortized cost	853,413	278,281
Net Loans	18,990,986	18,900,820
Less: ACL - loans	(265,986)	(277,567)
Loans, net	18,725,000	18,623,253
Net premises and equipment	229,035	231,480
Accrued interest receivable	65,649	72,942
Goodwill and intangible assets	536,544	536,659
Other assets	962,575	1,078,128
Total Assets	25,892,990	25,906,733
LIABILITIES
Noninterest-bearing	7,046,116	6,531,002
Interest-bearing	14,587,722	14,308,205
Total Deposits	21,633,838	20,839,207
Short-term borrowings	520,989	630,066
Accrued interest payable	5,618	10,365
Other liabilities	476,483	514,004
Federal Home Loan Bank advances and long-term debt	626,407	1,296,263
Total Liabilities	23,263,335	23,289,905
SHAREHOLDERS’ EQUITY
Preferred stock, no par value, 10,000,000 shares authorized; Series A, 200,000 shares authorized and issued in 2020, liquidation preference of $1,000 per share	192,878	192,878
Common stock, $2.50 par value, 600.0 million shares authorized, 223.2 million shares issued in 2021 and in 2020	558,116	557,917
Additional paid-in capital	1,511,101	1,508,117
Retained earnings	1,168,491	1,120,781
Accumulated other comprehensive gain	25,838	65,091
Treasury stock, at cost, 60.7 million shares in 2021 and 60.8 million shares in 2020	(826,769)	(827,956)
Total Shareholders’ Equity	2,629,655	2,616,828
Total Liabilities and Shareholders’ Equity	$ 25,892,990	$ 25,906,733

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	200,000	200,000
Liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	223,200,000	223,200,000
Treasury stock, shares (in shares)	60,700,000	60,800,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST INCOME
Loans, including fees	$ 163,985	$ 175,523
Investment securities:
Taxable	13,691	16,294
Tax-exempt	5,653	4,709
Loans held for sale	471	320
Other interest income	1,136	2,532
Total Interest Income	184,936	199,378
Interest Expense
Deposits	9,602	26,440
Short-term borrowings	188	4,073
Long-term borrowings	10,698	8,119
Total Interest Expense	20,488	38,632
Net Interest Income	164,448	160,746
Provision for credit losses	(5,500)	44,030
Net Interest Income After Provision for Credit Losses	169,948	116,716
Non-Interest Income
Non-interest income before investment securities gains	61,922	54,598
Investment securities gains, net	33,475	46
Total Non-Interest Income	95,397	54,644
NON-INTEREST EXPENSE
Salaries and employee benefits	82,586	80,228
Net occupancy	13,982	13,486
Data processing and software	13,561	11,645
Other outside services	8,490	7,881
State taxes	4,505	2,804
Equipment	3,428	3,418
Professional fees	2,779	4,202
FDIC insurance	2,624	2,808
Amortization of TCI	1,531	1,450
Marketing	1,002	1,579
Intangible amortization	115	132
Debt extinguishment	32,163	0
Other	11,618	12,919
Total Non-Interest Expense	178,384	142,552
Income Before Income Taxes	86,961	28,808
Income taxes	13,898	2,761
Net Income	73,063	26,047
Preferred stock dividends	(2,591)	0
Net Income Available to Common Shareholders	$ 70,472	$ 26,047
PER SHARE:
Net Income (Basic) (in dollars per share)	$ 0.43	$ 0.16
Net Income (Diluted) (in dollars per share)	0.43	0.16
Cash Dividends (in dollars per share)	$ 0.14	$ 0.13
Investment management and trust services
Non-Interest Income
Non-interest income before investment securities gains	$ 17,347	$ 15,055
Other service charges and fees
Non-Interest Income
Non-interest income before investment securities gains	16,342	18,419
Service charges on deposit accounts
Non-Interest Income
Non-interest income before investment securities gains	10,754	11,239
Mortgage banking income
Non-Interest Income
Non-interest income before investment securities gains	13,960	6,234
Other
Non-Interest Income
Non-interest income before investment securities gains	$ 3,519	$ 3,651

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 73,063	$ 26,047
Other Comprehensive (Loss) Income, net of tax:
Unrealized (loss) gain on securities	(39,999)	17,431
Reclassification adjustment for securities gains included in net income	377	(36)
Amortization of net unrealized losses on AFS securities transferred to HTM	1,787	795
Net unrealized loss on interest rate swaps used in cash flow hedges	(1,707)	0
Amortization of net unrecognized pension and postretirement income	289	255
Other Comprehensive (Loss) Income	(39,253)	18,445
Total Comprehensive Income	$ 33,810	$ 44,492

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2019	$ 2,342,176	$ (43,807)		$ 0	$ 556,110	$ 1,499,681	$ 1,079,391	$ (43,807)		$ (137)	$ (792,869)
Beginning Balance (in shares) at Dec. 31, 2019				0	164,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	26,047						26,047
Other comprehensive income	18,445									18,445
Stock issued (in shares)					125
Common stock issued	2,001				$ 133	889					979
Stock-based compensation awards	1,619					1,619
Acquisition of treasury stock (in shares)					(2,908)
Acquisition of treasury stock (in shares)	(39,748)										(39,748)
Common stock cash dividends	(20,985)						(20,985)
Ending Balance at Mar. 31, 2020	2,285,748			$ 0	$ 556,243	1,502,189	1,040,646			18,308	(831,638)
Ending Balance (in shares) at Mar. 31, 2020				0	161,435
Beginning Balance at Dec. 31, 2020	2,616,828			$ 192,878	$ 557,917	1,508,117	1,120,781			65,091	(827,956)
Beginning Balance (in shares) at Dec. 31, 2020				200	162,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	73,063						73,063
Other comprehensive income	(39,253)									(39,253)
Stock issued (in shares)					167
Common stock issued	2,468				$ 199	1,082					1,187
Stock-based compensation awards	1,902					1,902
Preferred stock dividend	(2,591)						(2,591)
Common stock cash dividends	(22,762)						(22,762)
Ending Balance at Mar. 31, 2021	$ 2,629,655			$ 192,878	$ 558,116	$ 1,511,101	$ 1,168,491			$ 25,838	$ (826,769)
Ending Balance (in shares) at Mar. 31, 2021				200	162,517
[1]	The Corporation adopted ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments on January 1, 2020. See Note 1, "Basis of Presentation" to the Consolidated Financial Statements for further details.

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends per share	$ 0.14	$ 0.13

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 73,063	$ 26,047
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(5,500)	44,030
Depreciation and amortization of premises and equipment	6,870	7,161
Amortization of TCI	6,935	7,619
Net amortization of investment securities premiums	3,716	2,707
Investment securities gains, net	(33,475)	(46)
Gain on sales of mortgage loans held for sale	(8,656)	(6,181)
Proceeds from sales of mortgage loans held for sale	294,478	195,649
Originations of mortgage loans held for sale	(236,028)	(192,285)
Amortization of intangible assets	115	132
Amortization of issuance costs and discounts on long-term borrowings	1,146	250
Debt extinguishment costs	32,163	0
Stock-based compensation	1,902	1,619
Other changes, net	66,683	(133,579)
Total adjustments	130,349	(72,924)
Net cash provided by (used in) operating activities	203,412	(46,877)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS securities	59,342	59,894
Proceeds from principal repayments and maturities of AFS securities	134,684	61,408
Proceeds from principal repayments and maturities of HTM securities	29,066	19,758
Purchase of AFS securities	(304,493)	(390,936)
Purchase of HTM securities	(227,687)	0
Sale of Visa Shares	33,962	0
Sale (purchase) of FRB and FHLB stock	25,920	(21,567)
Net increase in loans	(96,347)	(250,993)
Net change in tax credit investments	(4,425)	(4,023)
Net change in tax credit investments	(977)	(128)
Net cash used in investing activities	(350,955)	(526,587)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	971,180	(34,866)
Net (decrease) increase in time deposits	(176,549)	5,979
Net (decrease) increase in short-term borrowings	(109,077)	503,567
Proceeds from long-term borrowings	0	496,461
Repayments of long-term borrowings	(703,165)	(13)
Net proceeds from issuance of common stock	2,468	2,001
Dividends paid	(23,270)	(21,348)
Acquisition of treasury stock	0	(39,748)
Net cash (used in) provided by financing activities	(38,413)	912,033
Net (Decrease) Increase in Cash and Cash Equivalents	(185,956)	338,569
Cash and Cash Equivalents at Beginning of Period	1,847,832	517,791
Cash and Cash Equivalents at End of Period	1,661,876	856,360
Cash paid during the period for:
Interest	25,235	36,576
Income taxes	477	1,072
Supplemental schedule of certain noncash activities:
Transfer of AFS securities to HTM securities	$ 376,165	$ 0

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements of the Corporation have been prepared in conformity with 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 GAAP for complete financial statements. The preparation of financial statements in accordance with 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, 2020. Operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the SEC. CECL Adoption On January 1, 2020, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. The Corporation recorded an increase of $58.3 million to the ACL on January 1, 2020 as a result of the adoption of CECL. Retained earnings decreased $43.8 million and deferred tax assets increased by $12.4 million. Included in the $58.3 million increase to the ACL was $2.1 million for certain OBS credit exposures that was previously recognized in other liabilities before the adoption of CECL. CARES Act and Consolidated Appropriations Act - 2021 On March 27, 2020 the CARES Act was signed into law. The CARES Act includes an option for financial institutions to suspend the requirements of GAAP for certain loan modifications that would otherwise be categorized as a TDR. Certain conditions must be met with respect to the loan modification including that the modification is related to COVID-19 and the modified loan was not more than 30 days past due on December 31, 2019. On December 27, 2020, the 2021 Consolidated Appropriations Act was signed into law and this Act extended the relief for TDR treatment that was set to expire on December 31, 2020 to the earlier of 60 days after the national emergency termination date or January 1, 2022. The Corporation is applying the option under the CARES act for all loan modifications that qualify. Recently Adopted Accounting Standards On January 1, 2021, the Corporation adopted ASC Update 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The Corporation adopted this standards update effective with its March 31, 2021 quarterly report on Form 10-Q and it did not have a material impact on the consolidated financial statements. On January 1, 2021, the Corporation adopted ASC Update 2021-01 Reference Rate Reform (Topic 848) . This update permits entities to apply optional expedients in Topic 848 to derivative instruments modified because of LIBOR transition affected by changes to the interest rates used for discounting, margining or contract price alignment due to reference rate reform. This update was effective upon issuance and entities may elect to apply the guidance to modifications either retrospectively, as of any date from the beginning of any interim period that includes or is subsequent to March 12, 2020, or prospectively to new modifications from any date in an interim period that includes or is subsequent to January 7, 2021. The Corporation adopted this standards update retrospectively effective with its March 31, 2021 quarterly report on Form 10-Q and it did not have a material impact on the consolidated financial statements.

Restrictions on Cash and Cash E

Restrictions on Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Cash Equivalents	Restrictions on Cash and Cash EquivalentsThe Bank is required to maintain reserves against its deposit liabilities. Prior to March 2020, reserves were in the form of cash and balances with the FRB. The FRB suspended cash reserve requirements effective March 26, 2020. In addition, cash collateral is posted by the Corporation with counterparties to secure derivative and other contracts. The amounts of such cash collateral as of March 31, 2021 and December 31, 2020 were $243.6 million and $408.1 million, respectively.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following table presents the amortized cost and estimated fair values of investment securities for the periods presented: March 31, 2021 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 953,601 $ 42,412 $ (1,253) $ 994,760 Corporate debt securities 348,162 11,970 (761) 359,371 Collateralized mortgage obligations 390,253 10,633 (1,005) 399,881 Residential mortgage-backed securities 257,409 1,941 (3,986) 255,364 Commercial mortgage-backed securities 668,144 12,455 (7,582) 673,017 Auction rate securities 76,350 — (146) 76,204 Total $ 2,693,919 $ 79,411 $ (14,733) $ 2,758,597 Held to Maturity Residential mortgage-backed securities $ 467,461 $ 16,303 $ (8,025) $ 475,739 Commercial mortgage-backed securities 385,952 — (17,948) 368,004 Total $ 853,413 $ 16,303 $ (25,973) $ 843,743 December 31, 2020 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 891,327 $ 61,286 $ — $ 952,613 Corporate debt securities 348,391 19,445 (691) 367,145 Collateralized mortgage obligations 491,321 12,560 (115) 503,766 Residential mortgage-backed securities 373,779 4,246 (27) 377,998 Commercial mortgage-backed securities 741,172 22,384 (1,141) 762,415 Auction rate securities 101,510 — (3,304) 98,206 Total $ 2,947,500 $ 119,921 $ (5,278) $ 3,062,143 Held to Maturity Residential mortgage-backed securities $ 278,281 $ 18,576 $ — $ 296,857 During the first quarter of 2021, the Corporation transferred residential and commercial mortgage backed securities from the AFS classification to the HTM classification. The amortized cost and estimated fair value of the securities transferred were both $376.2 million. Securities carried at $1.1 billion at March 31, 2021 and $520.5 million at December 31, 2020 were pledged as collateral to secure public and trust deposits and customer repurchase agreements. The amortized cost and estimated fair values of debt securities as of March 31, 2021, 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. March 31, 2021 Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (in thousands) Due in one year or less $ 13,107 $ 13,171 $ — $ — Due from one year to five years 37,176 38,417 — — Due from five years to ten years 343,642 355,683 — — Due after ten years 984,188 1,023,064 — — 1,378,113 1,430,335 — — Residential mortgage-backed securities (1) 257,409 255,364 467,461 475,739 Commercial mortgage-backed securities (1) 668,144 673,017 385,952 368,004 Collateralized mortgage obligations (1) 390,253 399,881 — — Total $ 2,693,919 $ 2,758,597 $ 853,413 $ 843,743 (1) Mortgage-backed securities and collateralized mortgage obligations do not have stated maturities and 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 investment securities for the periods presented: Gross Realized Gains Gross Realized Losses Net Gains Three months ended (in thousands) March 31, 2021 $ 34,016 $ (541) $ 33,475 March 31, 2020 117 (71) 46 During the first quarter of 2021, the Corporation completed a balance sheet restructuring that included a $34.0 million gain on the sale of Visa Shares, offset by net losses on other securities of $400,000, primarily in connection with the sale of $24.6 million of ARCs. In addition, debt extinguishment costs of $32.2 million included in non-interest expense and a write-off of $841,000 in unamortized discounts was recognized in net interest income in connection with the cash tender offer for certain of its outstanding senior and subordinated notes and the prepayment of certain term FHLB advances. See Note 14, "Long-Term Debt" for further details. The following tables present the gross unrealized losses and estimated fair values of investment securities, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: March 31, 2021 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 21 $ 88,141 $ (1,253) — $ — $ — $ 88,141 $ (1,253) Corporate debt securities 7 41,956 (582) 2 15,328 (179) 57,284 (761) Collateralized mortgage obligations 2 55,305 (1,005) — — — 55,305 (1,005) Residential mortgage-backed securities 8 173,908 (3,986) — — — 173,908 (3,986) Commercial mortgage-backed securities 10 183,175 (7,582) — — — 183,175 (7,582) Auction rate securities — — — 118 76,204 (146) 76,204 (146) Total available for sale 48 $ 542,485 $ (14,408) 120 $ 91,532 $ (325) $ 634,017 $ (14,733) Held to Maturity Residential mortgage-backed securities 12 $ 205,072 $ (8,025) — $ — $ — $ 205,072 $ (8,025) Commercial mortgage-backed securities 21 368,004 (17,948) — — — 368,004 (17,948) Total 33 $ 573,076 $ (25,973) — $ — $ — $ 573,076 $ (25,973) December 31, 2020 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) Corporate debt securities 9 $ 44,528 $ (377) 1 $ 6,871 $ (314) $ 51,399 $ (691) Collateralized mortgage obligations 3 57,601 (115) — — — 57,601 (115) Residential mortgage-backed securities 1 20,124 (27) — — — 20,124 (27) Commercial mortgage-backed securities 9 144,383 (1,141) — — — 144,383 (1,141) Auction rate securities — — — 162 98,206 (3,304) 98,206 (3,304) Total available for sale (1) 22 $ 266,636 $ (1,660) 163 $ 105,077 $ (3,618) $ 371,713 $ (5,278) (1) No HTM securities were in an unrealized loss position as of December 31, 2020. 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. 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 have an ACL for these investments as of March 31, 2021.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans and Allowance for Credit Losses	Loans and Allowance for Credit Losses Net Loans are summarized as follows: March 31, December 31, 2020 (in thousands) Real estate - commercial mortgage $ 7,142,137 $ 7,105,092 Commercial and industrial (1) 5,675,714 5,670,828 Real-estate - residential mortgage 3,254,058 3,141,915 Real-estate - home equity 1,149,958 1,202,913 Real-estate - construction 1,083,494 1,047,218 Consumer 451,857 466,772 Equipment lease financing and other 252,930 284,377 Overdrafts 1,373 4,806 Gross loans 19,011,521 18,923,921 Unearned income (20,535) (23,101) Net Loans $ 18,990,986 $ 18,900,820 (1) Includes PPP loans totaling $1.7 billion and $1.6 billion as of March 31, 2021 and December 31, 2020, respectively. The Corporation segments its loan portfolio by "portfolio segments," as presented in the table above. Certain portfolio segments are further disaggregated by "class segment" for the purpose of estimating credit losses. Allowance for Credit Losses The Corporation has elected to exclude accrued interest receivable from the measurement of its ACL. When a loan is placed on non-accrual status, any outstanding accrued interest is reversed against interest income. Loans: The ACL for loans is an estimate of the expected losses to be realized over the life of the loans in the portfolio. The ACL is determined for two distinct categories of loans: 1) loans evaluated collectively for expected credit losses and 2) loans evaluated individually for expected credit losses. Loans Evaluated Collectively: Loans evaluated collectively for expected credit losses include loans on accrual status, excluding accruing TDRs, and loans initially evaluated individually, but determined not to have enhanced credit risk characteristics. This category includes loans on non-accrual status and TDRs where the total commitment amount is less than $1 million. The ACL is estimated by applying a PD and LGD to the EAD at the loan level. In order to determine the PD, LGD, and EAD calculation inputs: • Loans are aggregated into pools based on similar risk characteristics. • The PD and LGD rates are determined by historical credit loss experience for each pool of loans. • The loan segment PD rates are estimated using six econometric regression models that use the Corporation’s historical credit loss experience and incorporate reasonable and supportable economic forecasts for various macroeconomic variables that are statistically correlated with expected loss behavior in the loan segment. • The reasonable and supportable forecast for each macroeconomic variable is sourced from an external third party and is applied over the contractual term of the Corporation’s loan portfolio. The Corporation’s economic forecast considers the general health of the economy, the interest rate environment, real estate pricing and market risk. • A single baseline forecast scenario is used for each macroeconomic variable. • The loan segment lifetime LGD rates are estimated using a loss rate approach based on the Corporation’s historical charge-off experience and the balance at the time of loan default. • The LGD rates are adjusted for the Corporation’s recovery experience. • To calculate the EAD, the corporation estimates contractual cash flows over the remaining life of each loan. Certain cash flow assumptions are established for each loan using maturity date, amortization schedule and interest rate. In addition, a prepayment rate is used in determining the EAD estimate. Loans Evaluated Individually: Loans evaluated individually for expected credit losses include loans on non-accrual status and TDRs where the commitment amount equals or exceeds $1.0 million. The required ACL for such loans is determined using either the present value of expected future cash flows, observable market price or the fair value of collateral. Loans evaluated individually may have specific allocations of the ACL assigned if the measured value of the loan using one of the noted techniques is less than its current carrying value. For loans measured using the fair value of collateral, if the analysis determines that sufficient collateral value would be available for repayment of the debt, then no allocations would be assigned to those loans. Collateral could be in the form of real estate 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. For loans secured by real estate, estimated fair values are determined primarily through appraisals performed by third-party appraisers, discounted to arrive at expected net sale proceeds. For collateral dependent loans, estimated real estate fair values are also net of estimated selling costs. When a real estate secured loan is impaired, a decision is made regarding whether an updated appraisal of the real estate is necessary. This decision is based on various considerations, including: the age of the most recent appraisal; the loan-to-value ratio based on the original appraisal; the condition of the property; the Corporation’s experience and knowledge of the real estate market; the purpose of the loan; market factors; payment status; the strength of any guarantors; and the existence and age of other indications of value such as broker price opinions, among others. The Corporation generally obtains updated appraisals performed by third-party appraisers for impaired loans secured predominantly by real estate every 12 months. When updated appraisals are not obtained for loans 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 there has not been a significant deterioration in the collateral value since the original appraisal was performed. For loans with principal balances greater than or equal to $1.0 million secured by non-real estate collateral, such as accounts receivable or inventory, estimated fair values are determined based on borrower financial statements, inventory listings, accounts receivable agings or borrowing base certificates. Indications of value from these sources are generally discounted based on the age of the financial information or the quality of the assets. Liquidation or collection discounts are applied to these assets based upon existing loan evaluation policies. Management regularly reviews loans in the portfolio to assess credit quality indicators and to determine appropriate loan classification. For commercial loans, commercial mortgages and construction loans to commercial borrowers, an internal risk rating process is used. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for these types of loans. The migration of loans through the various internal risk rating categories is a significant component of the ACL methodology for these loans, which bases the PD on this migration. Assigning risk ratings involves judgment. Risk ratings may be changed based on ongoing monitoring procedures, or if specific loan review assessments identify a deterioration or an improvement in the loan. The ACL is reviewed to evaluate its appropriateness in relation to the overall risk profile of the loan portfolio. The Corporation considers risk factors such as: local and national economic conditions; trends in delinquencies and non-accrual loans; the diversity of borrower industry types; and the composition of the portfolio by loan type. Qualitative and Other Adjustments to ACL: In addition to the quantitative credit loss estimates for loans evaluated collectively, qualitative factors that may not be fully captured in the quantitative results are also evaluated. These qualitative factors include changes in lending policy, the nature and volume of the portfolio, overall business conditions in the economy, credit concentrations, specific industry risks, competition, model imprecision and legal and regulatory requirements. Qualitative adjustments are judgmental and are based on management’s knowledge of the portfolio and the markets in which the Corporation operates. Qualitative adjustments are evaluated and approved on a quarterly basis. Additionally, the ACL includes other allowance categories that are not directly incorporated in the quantitative results. These categories include but are not limited to loans-in-process, trade acceptances and overdrafts. OBS Credit Exposures: The ACL for OBS credit exposures is recorded in other liabilities on the consolidated balance sheets. This portion of the ACL represents management’s estimate of expected losses in its unfunded loan commitments and other OBS credit exposures. The ACL specific to unfunded commitments is determined by estimating future draws and applying the expected loss rates on those draws. Future draws are based on historical averages of utilization rates (i.e., the likelihood of draws taken). The ACL for OBS credit exposures is increased or decreased by charges or reductions to expense, through the provision for credit losses. The following table presents the components of the ACL: March 31, 2021 December 31, 2020 (in thousands) ACL - loans $ 265,986 $ 277,567 ACL - OBS credit exposure 14,273 14,373 Total ACL $ 280,259 $ 291,940 The following table presents the activity in the ACL: Three months ended March 31 2021 2020 (in thousands) Balance at beginning of period $ 291,940 $ 166,209 Impact of adopting CECL on January 1, 2020 (1) — 58,349 Loans charged off (8,202) (14,003) Recoveries of loans previously charged off 2,021 2,887 Net loans charged off (6,181) (11,116) Provision for credit losses (2) (5,500) 44,029 Balance at end of period $ 280,259 $ 257,471 (1) Includes $12.6 million of reserves for OBS credit exposures as of January 1, 2020. (2) Includes $(100,000) and $3.8 million related to OBS credit exposures for the three months ended March 31, 2021 and 2020, respectively. The following table presents the activity in the ACL - loans by portfolio segment: Real Estate - Commercial and Real Estate - Real Estate - Real Estate Consumer Equipment lease financing, other Total (in thousands) Three months ended March 31, 2021 Balance at December 31, 2020 $ 103,425 $ 74,771 $ 14,232 $ 51,995 $ 15,608 $ 10,905 $ 6,633 $ 277,567 Loans charged off (1,837) (4,319) (212) (192) (39) (635) (968) (8,202) Recoveries of loans previously charged off 174 769 51 95 384 389 159 2,021 Net loans recovered (charged off) (1,663) (3,550) (161) (97) 345 (246) (809) (6,181) Provision for loan losses (1) (786) (27) (341) (1,903) (874) (1,247) (222) (5,400) Balance at March 31, 2021 $ 100,976 $ 71,194 $ 13,730 $ 49,995 $ 15,079 $ 9,412 $ 5,602 $ 265,986 Three months ended March 31, 2020 Balance at December 31, 2019 $ 45,610 $ 68,602 $ 17,744 $ 19,771 $ 4,443 $ 3,762 $ 3,690 $ 163,622 Impact of adopting CECL on January 1, 2020 29,361 (18,576) (65) 21,235 4,015 5,969 3,784 45,723 Loans charged off (855) (10,899) (316) (187) — (1,213) (533) (14,003) Recoveries of loans previously charged off 244 1,734 646 85 70 — 108 2,887 Net loans (charged off) recovered (611) (9,165) 330 (102) 70 (1,213) (425) (11,116) Provision for loan losses (1) 15,959 22,745 (2,756) 1,523 (130) 1,347 1,591 40,279 Balance at March 31, 2020 $ 90,319 $ 63,606 $ 15,253 $ 42,427 $ 8,398 $ 9,865 $ 8,640 $ 238,508 (1) Provision included in the table only includes the portion related to Net Loans. Several factors as of the end of the first quarter of 2021 in comparison to the end of the fourth quarter of 2020, including improved economic forecasts and a decrease in specific allocations within the ACL for loans evaluated individually, reduced the level of the ACL determined to be necessary as of March 31, 2021, resulting in the negative provision for credit losses for the three months ended March 31, 2021. The higher provision expense during the first three months of 2020 was largely driven by the overall downturn in economic forecasts due to COVID-19, resulting in higher expected future credit losses under CECL. Qualitative adjustments during the first three months of 2020 increased compared to those at the time of the adoption of CECL on January 1, 2020 primarily as a result of uncertainties related to the economic impact of COVID-19, including consideration for the future performance of loans that received deferrals or forbearances as a result of COVID-19 and the impact COVID-19 had on certain industries where the quantitative models were not fully capturing the appropriate level of risk at that time. PPP loans issued are fully guaranteed by the SBA and, as such, no ACL was recorded against the PPP loan portfolio. Non-accrual Loans All loans individually evaluated for impairment are measured for losses on a quarterly basis. As of March 31, 2021 and December 31, 2020, substantially all of the Corporation’s individually evaluated 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, if any. Collateral could be in the form of real estate, in the case of commercial mortgages and construction loans, or business assets, such as accounts receivable or inventory, in the case of commercial and industrial loans. Commercial and industrial loans may also be secured by real estate. As of March 31, 2021 and December 31, 2020, approximately 97% and 83%, respectively, of loans evaluated individually for impairment with principal balances greater than or equal to $1.0 million, whose primary collateral consisted of real estate, were measured at estimated fair value using appraisals performed by state certified third-party appraisers that had been updated in the preceding 12 months. The following table presents total non-accrual loans, by class segment: March 31, 2021 December 31, 2020 With a Related Allowance Without a Related Allowance Total With a Related Allowance Without a Related Allowance Total (in thousands) Real estate - commercial mortgage $ 21,107 $ 30,870 $ 51,977 $ 19,909 $ 31,561 $ 51,470 Commercial and industrial 13,012 18,640 31,652 13,937 18,056 31,993 Real estate - residential mortgage 31,203 2,198 33,401 24,590 1,517 26,107 Real estate - home equity 9,368 — 9,368 9,398 190 9,588 Real estate - construction 544 897 1,441 437 958 1,395 Consumer 301 — 301 332 — 332 Equipment lease financing and other 6,462 9,287 15,749 — 16,313 16,313 $ 81,997 $ 61,892 $ 143,889 $ 68,603 $ 68,595 $ 137,198 As of March 31, 2021 and December 31, 2020, there were $61.9 million and $68.6 million, respectively, of non-accrual loans that did not have a related allowance for credit losses. 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. Asset Quality Maintaining an appropriate ACL is dependent on various factors, including the ability to identify potential problem loans in a timely manner. For commercial construction, residential construction, commercial and industrial, and commercial real estate, an internal risk rating process is used. The Corporation believes that internal risk ratings are the most relevant credit quality indicator for these types of loans. The migration of loans through the various internal risk rating categories is a significant component of the ACL methodology for these loans, which bases the probability of default on this migration. Assigning risk ratings involves judgment. The Corporation's loan review officers provide a separate assessment of risk rating accuracy. Risk ratings may be changed based on the ongoing monitoring procedures performed by loan officers or credit administration staff or if specific loan review assessments identify a deterioration or an improvement in the loans. 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 have a heightened credit risk, but not to the 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 following table summarizes designated internal risk rating categories by portfolio segment and loan class, by origination year, in the current period: March 31, 2021 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2021 2020 2019 2018 2017 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 14,615 $ 233,770 $ 201,440 $ 218,467 $ 80,686 $ 142,339 $ 36,046 $ — $ 927,363 Special Mention 110 — — — — 13,195 — — 13,305 Substandard or Lower — — 154 — 1,976 3,520 406 — 6,056 Total real estate - construction 14,725 233,770 201,594 218,467 82,662 159,054 36,452 — 946,724 Real estate - construction (1) Current period gross charge-offs — — (39) — — — — — (39) Current period recoveries — — — — — 384 — — 384 Total net (charge-offs) recoveries — — (39) — — 384 — — 345 Commercial and industrial Pass 885,616 1,624,535 481,038 290,788 201,910 726,981 1,205,065 — 5,415,933 Special Mention 143 9,136 20,949 16,337 10,413 30,861 48,939 — 136,778 Substandard or Lower — 2,847 7,167 13,503 10,638 34,805 54,043 — 123,003 Total commercial and industrial 885,759 1,636,518 509,154 320,628 222,961 792,647 1,308,047 — 5,675,714 Commercial and industrial Current period gross charge-offs — — (613) (2,871) (60) (775) — — (4,319) Current period recoveries — — 37 126 36 570 — — 769 Total net (charge-offs) recoveries — — (576) (2,745) (24) (205) — — (3,550) Real estate - commercial mortgage Pass 200,885 993,776 926,352 670,684 767,399 2,800,409 49,207 321 6,409,033 Special Mention — 23,282 30,629 92,800 75,417 248,403 2,406 — 472,937 Substandard or Lower — 1,028 24,008 10,673 46,460 174,421 3,577 — 260,167 Total real estate - commercial mortgage 200,885 1,018,086 980,989 774,157 889,276 3,223,233 55,190 321 7,142,137 Real estate - commercial mortgage Current period gross charge-offs — — — — (1,719) (118) — — (1,837) Current period recoveries — — — — — 174 — — 174 Total net (charge-offs) recoveries — — — — (1,719) 56 — — (1,663) Total Pass $ 1,101,116 $ 2,852,081 $ 1,608,830 $ 1,179,939 $ 1,049,995 $ 3,669,729 $ 1,290,318 $ 321 $ 12,752,329 Special Mention 253 32,418 51,578 109,137 85,830 292,459 51,345 — 623,020 Substandard or Lower — 3,875 31,329 24,176 59,074 212,746 58,026 — 389,226 Total $ 1,101,369 $ 2,888,374 $ 1,691,737 $ 1,313,252 $ 1,194,899 $ 4,174,934 $ 1,399,689 $ 321 $ 13,764,575 (1) Excludes real estate - construction - other. 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 equipment lease financing. 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 ACL methodology for those loans, which bases the PD on this migration. The following table summarizes designated internal risk rating categories by portfolio segment and loan class, by origination year, in the prior period: December 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 185,883 $ 229,097 $ 217,604 $ 81,086 $ 37,976 $ 110,470 $ 38,026 $ — $ 900,142 Special Mention — — — — 7,047 6,212 — — 13,259 Substandard or Lower — 447 — 2,000 753 1,637 632 — 5,469 Total real estate - construction 185,883 229,544 217,604 83,086 45,776 118,319 38,658 — 918,870 Real estate - construction (1) Current period gross charge-offs — — — — — (17) — — (17) Current period recoveries — — — — 68 5,054 — — 5,122 Total net (charge-offs) recoveries — — — — 68 5,037 — — 5,105 Commercial and industrial Pass 2,283,533 508,541 298,567 214,089 208,549 596,646 1,278,689 — 5,388,614 Special Mention 6,633 23,834 29,167 10,945 11,506 25,960 45,994 — 154,039 Substandard or Lower 3,221 5,947 8,434 11,251 11,192 23,852 64,278 — 128,175 Total commercial and industrial 2,293,387 538,322 336,168 236,285 231,247 646,458 1,388,961 — 5,670,828 Commercial and industrial Current period gross charge-offs — (114) (30) (488) (393) (520) (17,370) — (18,915) Current period recoveries — 43 486 216 162 4,531 5,958 — 11,396 Total net (charge-offs) recoveries — (71) 456 (272) (231) 4,011 (11,412) — (7,519) Real estate - commercial mortgage Pass 973,664 917,510 708,946 794,955 783,094 2,213,343 53,041 404 6,444,957 Special Mention 13,639 40,874 84,047 80,705 89,112 167,424 2,364 — 478,165 Substandard or Lower 1,238 6,681 6,247 39,027 22,605 103,007 2,225 940 181,970 Total real estate - commercial mortgage 988,541 965,065 799,240 914,687 894,811 2,483,774 57,630 1,344 7,105,092 Real estate - commercial mortgage Current period gross charge-offs (60) (21) (36) (2,515) (29) (1,547) (17) — (4,225) Current period recoveries — 6 — — 1 1,020 — — 1,027 Total net (charge-offs) recoveries (60) (15) (36) (2,515) (28) (527) (17) — (3,198) Total Pass $ 3,443,080 $ 1,655,148 $ 1,225,117 $ 1,090,130 $ 1,029,619 $ 2,920,459 $ 1,369,756 $ 404 $ 12,733,713 Special Mention 20,272 64,708 113,214 91,650 107,665 199,596 48,358 — 645,463 Substandard or Lower 4,459 13,075 14,681 52,278 34,550 128,496 67,135 940 315,614 Total $ 3,467,811 $ 1,732,931 $ 1,353,012 $ 1,234,058 $ 1,171,834 $ 3,248,551 $ 1,485,249 $ 1,344 $ 13,694,790 (1) Excludes real estate - construction - other. The Corporation considers the performance of the loan portfolio and its impact on the ACL. For certain loan classes, the Corporation evaluates credit quality based on the aging status of the loan. The following tables present the amortized cost of these loans based on payment activity, by origination year, for the periods shown: March 31, 2021 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2021 2020 2019 2018 2017 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 4,491 $ 29,767 $ 8,140 $ 12,312 $ 9,997 $ 119,037 $ 948,645 $ 4,845 $ 1,137,234 Nonperforming — — 88 23 264 2,597 9,545 207 12,724 Total real estate - home equity 4,491 29,767 8,228 12,335 10,261 121,634 958,190 5,052 1,149,958 Real estate - home equity Current period gross charge-offs — — — — — — (212) — (212) Current period recoveries — — — — — — 51 — 51 Total net (charge-offs) recoveries — — — — — — (161) — (161) Real estate - residential mortgage Performing 358,906 1,240,446 513,892 181,509 292,014 630,996 — — 3,217,763 Nonperforming — 3,927 1,654 3,450 2,945 24,319 — — 36,295 Total real estate - residential mortgage 358,906 1,244,373 515,546 184,959 294,959 655,315 — — 3,254,058 Real estate - residential mortgage Current period gross charge-offs — — (40) (47) — (105) — — (192) Current period recoveries — — — 3 1 — 92 — 96 Total net (charge-offs) recoveries — — (40) (44) 1 (105) 92 — (96) Consumer Performing 27,910 103,924 90,185 85,837 38,190 56,885 48,371 — 451,302 Nonperforming — 127 37 63 35 243 50 — 555 Total consumer 27,910 104,051 90,222 85,900 38,225 57,128 48,421 — 451,857 Consumer Current period gross charge-offs — (95) (94) (111) (79) (229) (27) — (635) Current period recoveries — 33 5 11 19 321 — — 389 Total net (charge-offs) recoveries — (62) (89) (100) (60) 92 (27) — (246) Equipment lease financing and other Performing 25,663 68,641 51,804 36,350 22,506 13,054 — — 218,018 Nonperforming — — — — 15,724 26 — — 15,750 Total leasing and other 25,663 68,641 51,804 36,350 38,230 13,080 — — 233,768 Equipment lease financing and other Current period gross charge-offs — (968) — — — — — — (968) Current period recoveries — 120 39 — — — — — 159 Total net (charge-offs) recoveries — (848) 39 — — — — — (809) Construction - other Performing 17,458 97,829 16,172 4,755 — 16 — — 136,230 Nonperforming — — 364 — 176 — — — 540 Total construction - other 17,458 97,829 16,536 4,755 176 16 — — 136,770 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 434,428 $ 1,540,607 $ 680,193 $ 320,763 $ 362,707 $ 819,988 $ 997,016 $ 4,845 $ 5,160,547 Nonperforming — 4,054 2,143 3,536 19,144 27,185 9,595 207 65,864 Total $ 434,428 $ 1,544,661 $ 682,336 $ 324,299 $ 381,851 $ 847,173 $ 1,006,611 $ 5,052 $ 5,226,411 December 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 31,445 $ 8,176 $ 13,906 $ 11,024 $ 11,667 $ 126,749 $ 982,285 $ 5,321 $ 1,190,573 Nonperforming — 88 23 233 221 2,290 9,485 — 12,340 Total real estate - home equity 31,445 8,264 13,929 11,257 11,888 129,039 991,770 5,321 1,202,913 Real estate - home equity Current period gross charge-offs — — — — — (34) (1,159) — (1,193) Current period recoveries — — — — — 138 366 — 504 Total net (charge-offs) recoveries — — — — — 104 (793) — (689) Real estate - residential mortgage Performing 1,255,532 585,878 228,398 341,563 264,990 434,889 — — 3,111,250 Nonperforming 217 2,483 3,177 2,483 722 21,583 — — 30,665 Total real estate - residential mortgage 1,255,749 588,361 231,575 344,046 265,712 456,472 — — 3,141,915 Real estate - residential mortgage Current period gross charge-offs — (68) (101) (190) (7) (254) — — (620) Current period recoveries — 68 16 1 1 405 — — 491 Total net (charge-offs) recoveries — — (85) (189) (6) 151 — — (129) Consumer Performing 114,399 98,587 95,072 43,334 25,804 36,086 52,698 42 466,022 Nonperforming 168 19 124 141 114 150 34 — 750 Total consumer 114,567 98,606 95,196 43,475 25,918 36,236 52,732 42 466,772 Consumer Current period gross charge-offs (134) (542) (524) (444) (489) (769) (498) — (3,400) Current period recoveries — 64 165 159 94 101 1,292 — 1,875 Total net (charge-offs) recoveries (134) (478) (359) (285) (395) (668) 794 — (1,525) Equipment lease financing and other Performing 102,324 65,303 49,453 34,995 15,631 5,040 — — 272,746 Nonperforming — — 30 15,983 142 282 — — 16,437 Total leasing and other 102,324 65,303 49,483 50,978 15,773 5,322 — — 289,183 Equipment lease financing and other Current period gross charge-offs (606) (1,581) — — — — — — (2,187) Current period recoveries 185 349 21 18 11 21 — — 605 Total net (charge-offs) recoveries (421) (1,232) 21 18 11 21 — — (1,582) Construction - other Performing 96,444 24,888 6,822 — 16 — — — 128,170 Nonperforming — — — 178 — — — — 178 Total construction - other 96,444 24,888 6,822 178 16 — — — 128,348 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 1,600,144 $ 782,832 $ 393,651 $ 430,916 $ 318,108 $ 602,764 $ 1,034,983 $ 5,363 $ 5,168,761 Nonperforming 385 2,590 3,354 19,018 1,199 24,305 9,519 — 60,370 Total $ 1,600,529 $ 785,422 $ 397,005 $ 449,934 $ 319,307 $ 627,069 $ 1,044,502 $ 5,363 $ 5,229,131 The following table presents non-performing assets: March 31, December 31, (in thousands) Non-accrual loans $ 143,889 $ 137,198 Loans 90 days or more past due and still accruing 8,559 9,929 Total non-performing loans 152,448 147,127 OREO (1) 3,664 4,178 Total non-performing assets $ 156,112 $ 151,305 (1) Excludes $7.6 million and $8.1 million of residential mortgage properties for which formal foreclosure proceedings were in process as of March 31, 2021 and December 31, 2020, respectively. The following tables present the aging of the amortized cost basis of loans, by class segment: 30-59 60-89 ≥ 90 Days Days Past Days Past Past Due Non- Due Due and Accruing Accrual Current Total (in thousands) March 31, 2021 Real estate – commercial mortgage $ 9,596 $ 1,516 $ 2,187 $ 51,977 $ 7,076,861 $ 7,142,137 Commercial and industrial 1,718 1,894 219 31,652 5,640,231 5,675,714 Real estate – residential mortgage 8,485 933 2,750 33,401 3,208,489 3,254,058 Real estate – home equity 2,795 1,062 3,148 9,368 1,133,585 1,149,958 Real estate – construction 170 — — 1,441 1,081,883 1,083,494 Consumer 1,224 491 255 301 449,586 451,857 Equipment lease financing and other 101 142 — 15,749 217,776 233,768 Total $ 24,089 $ 6,038 $ 8,559 $ 143,889 $ 18,808,411 $ 18,990,986 30-59 Days Past 60-89 ≥ 90 Days Non- Current Total (in thousands) December 31, 2020 Real estate – commercial mortgage $ 14,999 $ 9,273 $ 1,177 $ 51,470 $ 7,028,173 $ 7,105,092 Commercial and industrial 11,285 1,068 616 31,993 5,625,866 5,670,828 Real estate – residential mortgage 22,281 7,675 4,687 26,107 3,081,165 3,141,915 Real estate – home equity 5,622 1,654 2,753 9,588 1,183,296 1,202,913 Real estate – construction 1,938 — 155 1,395 1,043,730 1,047,218 Consumer 3,036 501 417 332 462,486 466,772 Equipment lease financing and other 838 150 124 16,313 248,657 266,082 Total $ 59,999 $ 20,321 $ 9,929 $ 137,198 $ 18,673,373 $ 18,900,820 Collateral-Dependent Loans A financial asset is considered to be collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of financial assets deemed collateral-dependent, the Corporation elected the practical expedient to estimate expected credit losses based on the collateral’s fair value less cost to sell. In most cases, the Corporation records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less cost to sell. Substantially all of the collateral supporting collateral-dependent financial assets consists of various types of real estate, including residential properties, commercial properties, such as retail centers, office buildings, and lodging, agriculture land, and vacant land. Troubled Debt Restructurings The following table presents TDRs, by class segment: March 31, December 31, (in thousands) Real estate - commercial mortgage $ 27,961 $ 28,451 Commercial and industrial 7,041 6,982 Real estate - residential mortgage 18,214 18,602 Real estate - home equity 13,674 14,391 Real estate - construction 154 — Consumer 5 — Total accruing TDRs 67,049 68,426 Non-accrual TDRs (1) 44,986 35,755 Total TDRs $ 112,035 $ 104,181 (1) Included in non-accrual loans in the preceding table detailing non-performing assets. The following table presents TDRs, by class segment, for loans that were modified during the three months ended March 31, 2021 and 2020: Three months ended March 31 2021 2020 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Commercial and industrial 4 $ 1,894 1 $ 74 Real estate - commercial mortgage 2 4,162 1 392 Real estate - residential mortgage 23 7,626 7 660 Real estate - home equity 5 148 8 577 Real estate - construction 1 154 — — Total 35 $ 13,984 17 $ 1,703 Restructured loan modifications may include payment schedule modifications, interest rate concessions, bankruptcies, principal reduction or some combination of these concessions. The restructured loan modifications primarily included maturity date extensions, rate modifications and payment schedule modifications. In accordance with regulatory guidance, payment schedule modifications granted after March 13, 2020 to borrowers impacted by the effects of the COVID-19 pandemic and who were not delinquent at the time of the payment schedule modifications have been excluded from TDRs. As of March 31, 2021 and 2020, payment schedule modifications having a recorded investment of $3.6 billion and $1.0 billion, respectively, were excluded from TDRs based on this regulatory guidance.

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2021
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets: Three months ended March 31 2021 2020 (in thousands) Amortized cost: Balance at beginning of period $ 38,745 $ 39,267 Originations of MSRs 2,811 1,478 Amortization (3,753) (1,891) Balance at end of period $ 37,803 $ 38,854 Valuation allowance: Balance at beginning of period $ (10,500) $ — Reduction (addition) to valuation allowance 6,100 (1,100) Balance at end of period $ (4,400) $ (1,100) Net MSRs at end of period $ 33,403 $ 37,754 MSRs represent the economic value of contractual rights to service mortgage loans that have been sold. The total portfolio of mortgage loans serviced by the Corporation for unrelated third parties was $4.6 billion and $4.7 billion as of March 31, 2021 and December 31, 2020, respectively. Actual and expected prepayments of the underlying mortgage loans can impact the fair values of the 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. The fair values of MSRs were $33.4 million and $28.2 million at March 31, 2021 and December 31, 2020, respectively. Based on its fair value analysis as of March 31, 2021, the Corporation determined that a $6.1 million reduction to the valuation allowance was required for the three months ended March 31, 2021, resulting in a total valuation allowance of $4.4 million as of March 31, 2021. The decrease to the valuation allowance was recorded as an increase to mortgage banking income on the consolidated statements of income for the three months ended March 31, 2021.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2021
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. Certain of the Corporation's outstanding derivative contracts are designated as hedges, and none are entered into for speculative purposes. The Corporation does enter into derivative contracts that are intended to economically hedge certain of its risks, even if hedge accounting does not apply or the Corporation elects not to apply hedge accounting. The Corporation records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Corporation has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. For derivatives where hedge accounting is applied, changes in fair value are recognized in other comprehensive income. For derivatives where hedge accounting does not apply, changes in fair value are recognized in earnings as components of interest income, 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 derivative 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. For each of the derivatives, gross derivative assets and liabilities are recorded in other assets and other liabilities, respectively, on the consolidated balance sheets. Related gains and losses on these derivative instruments are recorded in other changes, net on the consolidated statement of cash flows. 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. Interest Rate Swaps - Non-Designated Hedges 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. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings. The Corporation’s existing credit derivatives result from participations in interest rate swaps provided by external lenders as part of loan participation arrangements, therefore, are not used to manage interest rate risk in the Corporation’s assets or liabilities. Derivatives not designated as hedges are not speculative and result from a service the Corporation provides to certain lenders which participate in loans. The Corporation is required to clear all eligible interest rate swap contracts with a clearing agent and is subject to the regulations of the Commodity Futures Trading Commission. Cash Flow Hedges of Interest Rate Risk The Corporation’s objectives in using interest rate derivatives are to reduce volatility in net interest income and to manage its exposure to interest rate movements. To accomplish this objective, the Corporation primarily uses interest rate swaps as part of its interest rate risk management strategy. During the first quarter of 2021, the Corporation entered into interest rate swaps designated as cash flow hedges to hedge the variable cash flows associated with existing floating rate loans. These hedge contracts involve the receipt of fixed-rate amounts from a counterparty in exchange for the Corporation making floating-rate payments over the life of the agreements without exchange of the underlying notional amount. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the unrealized gain or loss on the derivative is recorded in AOCI and subsequently reclassified into interest income in the same period during which the hedged transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest income as interest payments are made on the Corporation’s variable-rate liabilities. During the next twelve months, the Corporation estimates that an additional $3.4 million will be reclassified as an increase to interest income. 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. The following table presents a summary of the notional amounts and fair values of derivative financial instruments: March 31, 2021 December 31, 2020 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 274,909 $ 2,198 $ 382,903 $ 8,034 Negative fair values 40,007 (316) 3,154 (35) Forward Commitments Positive fair values 91,264 4,650 — — Negative fair values — — 292,262 (2,263) Interest Rate Swaps with Customers Positive fair values 3,169,658 179,934 3,834,062 330,951 Negative fair values 769,300 (9,721) 45,640 (2) Interest Rate Swaps with Dealer Counterparties Positive fair values 769,300 9,721 45,640 2 Negative fair values 3,169,658 (98,368) 3,834,062 (165,205) Interest Rate Swaps used in Cash Flow Hedges Positive fair values — 305 — — Negative fair values 500,000 (492) — — Foreign Exchange Contracts with Customers Positive fair values 12,196 280 1,121 5 Negative fair values 552 (14) 5,963 (275) Foreign Exchange Contracts with Correspondent Banks Positive fair values 2,821 43 6,372 318 Negative fair values 12,213 (258) 1,422 (5) The following table presents the effect of fair value and cash flow hedge accounting on accumulated other comprehensive income for the three months ended March 31, 2021: Amount of Loss Recognized in OCI on Derivative Amount of Loss Recognized in OCI Included Component Amount of Gain or (Loss) Recognized in OCI Excluded Component Location of Gain or (Loss) Recognized from AOCI into Income Amount of Gain Reclassified from AOCI into Income Amount of Gain Reclassified from AOCI into Income Included Component Amount of Gain or (Loss) Reclassified from AOCI into Income Excluded Component (in thousands) Derivatives in Cash Flow Hedging Relationships: Interest Rate Products $ (2,065) $ (2,065) $ — Interest Income $ 144 $ 144 $ — The following table presents the effect of fair value and cash flow hedge accounting on the consolidated statements of income for the three months ended March 31, 2021: Consolidated Statements of Income Classification Interest Income Total amounts of income line items presented in the consolidated statements of income in which the effects of fair value or cash flow hedges are recorded $ 144 The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships — Interest contracts: Amount of gain reclassified from AOCI into income 144 Amount of gain or (loss) reclassified from AOCI into income as a result that a forecasted transaction is no longer probable of occurring — Amount of Gain Reclassified from AOCI into Income - Included Component 144 Amount of Gain or (Loss) Reclassified from AOCI into Income - Excluded Component — The following table presents a summary of the fair value gains (losses) on derivative financial instruments: Consolidated Statements of Income Classification Three months ended March 31 2021 2020 (in thousands) Mortgage banking derivatives (1) Mortgage banking income $ 796 $ 1,040 Interest rate swaps Other expense (104) 72 Foreign exchange contracts Other income 8 119 Net fair value gains on derivative financial instruments $ 700 $ 1,231 (1) Includes interest rate locks with customers and forward commitments. Fair Value Option The Corporation has elected to measure mortgage loans held for sale at fair value. The following table presents a summary of mortgage loans held for sale and the impact of the fair value election on the consolidated financial statements as of the periods shown: March 31, December 31, (in thousands) Amortized cost (1) $ 33,801 $ 80,662 Fair value 34,092 83,886 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance. Losses related to changes in fair values of mortgage loans held for sale were $2.9 million for the three months ended March 31, 2021 compared to gains of $733,000 for the three months ended March 31, 2020. 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 swaps with financial institution counterparties and customers. 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. Not all of the derivatives are required to be cleared daily through a clearing agent. As a result, the total fair values of interest rate swap derivative assets and 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 swaps, 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 AFS 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. As of March 31, 2021, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $492,000. As of March 31, 2021, the Company has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral of $143.1 million. If the Company had breached any of these provisions at March 31, 2021, it could have been required to settle its obligations under the agreements at their termination value of $492,000. The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2021 Interest rate swap derivative assets $ 189,960 $ (11,779) $ — $ 178,181 Foreign exchange derivative assets with correspondent banks 43 (43) — — Total $ 190,003 $ (11,822) $ — $ 178,181 Interest rate swap derivative liabilities $ 108,581 $ (11,779) $ (96,802) $ — Foreign exchange derivative liabilities with correspondent banks 258 (43) — 215 Total $ 108,839 $ (11,822) $ (96,802) $ 215 December 31, 2020 Interest rate swap derivative assets $ 330,951 $ (2) $ — $ 330,949 Foreign exchange derivative assets with correspondent banks 318 (5) — 313 Total $ 331,269 $ (7) $ — $ 331,262 Interest rate swap derivative liabilities $ 165,205 $ (2) $ (165,203) $ — Foreign exchange derivative liabilities with correspondent banks 5 (5) — — Total $ 165,210 $ (7) $ (165,203) $ — (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.

Tax Credit Investments

Tax Credit Investments	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Tax Credit Investments	Tax Credit Investments TCIs are primarily for investments promoting qualified affordable housing projects and investments in community development entities. Investments in these projects generate a return primarily through the realization of federal income tax credits and deductions for operating losses over a specified time period. The TCIs are included in other assets, with any unfunded equity commitments recorded in other liabilities on the consolidated balance sheets. Certain TCIs qualify for the proportional amortization method and are amortized over the period the Corporation expects to receive the tax credits, with the expense included within income taxes on the consolidated statements of income. Other TCIs are accounted for under the equity method of accounting, with amortization included within non-interest expense on the consolidated statements of income. This amortization includes equity in partnership losses and the systematic write-down of investments over the period in which income tax credits are earned. All of the TCIs are evaluated for impairment at the end of each reporting period. The following table presents the balances of the Corporation's TCIs and related unfunded commitments: March 31, December 31, 2021 2020 Included in other assets: (in thousands) Affordable housing tax credit investment, net $ 145,888 $ 152,203 Other tax credit investments, net 58,782 59,224 Total TCIs, net $ 204,670 $ 211,427 Included in other liabilities: Unfunded affordable housing tax credit commitments $ 30,762 $ 31,562 Other tax credit liabilities 49,491 49,491 Total unfunded tax credit commitments and liabilities $ 80,253 $ 81,053 The following table presents other information relating to the Corporation's TCIs: Three months ended March 31 2021 2020 Components of income taxes: (in thousands) Affordable housing tax credits and other tax benefits $ (6,488) $ (7,194) Other tax credit investment credits and tax benefits (723) (941) Amortization of affordable housing investments, net of tax benefit 4,366 5,024 Deferred tax expense 160 208 Total net reduction in income tax expense $ (2,685) $ (2,903) Amortization of TCIs: Affordable housing tax credits investment $ 986 $ 1,022 Other tax credit investment amortization 545 428 Total amortization of TCIs $ 1,531 $ 1,450

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents changes in OCI: Before-Tax Amount Tax Effect Net of Tax Amount Three months ended March 31, 2021 (in thousands) Unrealized loss on securities $ (51,751) $ 11,753 $ (39,999) Reclassification adjustment for securities gains included in net income (1) 487 (110) 377 Amortization of net unrealized losses on AFS securities transferred to HTM (2) 2,312 (525) 1,787 Net unrealized loss on interest rate swaps used in cash flow hedges (3) (2,209) 502 (1,707) Amortization of net unrecognized pension and postretirement items (4) 370 (81) 289 Total OCI $ (50,791) $ 11,538 $ (39,253) Three months ended March 31, 2020 Unrealized gain on securities $ 22,380 $ (4,949) $ 17,431 Reclassification adjustment for securities gains included in net income (1) (46) 10 (36) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 1,022 (227) 795 Amortization of net unrecognized pension and postretirement items (4) 328 (73) 255 Total OCI $ 23,684 $ (5,239) $ 18,445 (1) Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details. (2) Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Amounts reclassified out of AOCI. Before-tax amounts included in "Interest Income" on the Consolidated Statements of Income. (4) Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "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 Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended March 31, 2021 Balance at December 31, 2020 $ 81,604 $ — $ (16,513) $ 65,091 OCI before reclassifications (39,999) — — (39,999) Amounts reclassified from AOCI 377 (1,707) 289 (1,042) Amortization of net unrealized losses on AFS securities transferred to HTM 1,787 — — 1,787 Balance at March 31, 2021 $ 43,769 $ (1,707) $ (16,224) $ 25,838 Three months ended March 31, 2020 Balance at December 31, 2019 $ 14,864 $ — $ (15,001) $ (137) OCI before reclassifications 17,431 — — 17,431 Amounts reclassified from AOCI (36) — 255 219 Amortization of net unrealized losses on AFS securities transferred to HTM 795 — — 795 Balance at March 31, 2020 $ 33,054 $ — $ (14,746) $ 18,308

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
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. All assets and liabilities measured at fair value on both a recurring and nonrecurring basis, have been categorized into the above three levels. The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: March 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 34,092 $ — $ 34,092 Available for sale investment securities: State and municipal securities — 994,760 — 994,760 Corporate debt securities — 359,371 — 359,371 Collateralized mortgage obligations — 399,881 — 399,881 Residential mortgage-backed securities — 255,364 — 255,364 Commercial mortgage-backed securities — 673,017 — 673,017 Auction rate securities — — 76,204 76,204 Total available for sale investment securities — 2,682,393 76,204 2,758,597 Other assets: Investments held in Rabbi Trust 25,374 — — 25,374 Derivative assets 323 196,808 — 197,131 Total assets $ 25,697 $ 2,913,293 $ 76,204 $ 3,015,194 Other liabilities: Deferred compensation liabilities $ 25,374 $ — $ — $ 25,374 Derivative liabilities 272 108,897 — 109,169 Total liabilities $ 25,646 $ 108,897 $ — $ 134,543 December 31, 2020 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 83,886 $ — $ 83,886 Available for sale investment securities: State and municipal securities — 952,613 — 952,613 Corporate debt securities — 367,145 — 367,145 Collateralized mortgage obligations — 503,766 — 503,766 Residential mortgage-backed securities — 377,998 — 377,998 Commercial mortgage-backed securities — 762,415 — 762,415 Auction rate securities — — 98,206 98,206 Total available for sale investment securities — 2,963,937 98,206 3,062,143 Other assets: Investments held in Rabbi Trust 24,383 — — 24,383 Derivative assets 323 338,987 — 339,310 Total assets $ 24,706 $ 3,386,810 $ 98,206 $ 3,509,722 Other liabilities: Deferred compensation liabilities $ 24,383 $ — $ — $ 24,383 Derivative liabilities 280 167,505 — 167,785 Total liabilities $ 24,663 $ 167,505 $ — $ 192,168 The valuation techniques used to measure fair value for the items in the preceding tables are as follows: Loans held for sale – This category includes mortgage loans held for sale that are measured at fair value. Fair values as of March 31, 2021 and December 31, 2020 were based on the price that secondary market investors were offering for loans with similar characteristics. See "Note 6 - 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 debt securities. Level 2 investment securities are valued by a third-party pricing service. 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. • State and municipal securities/Collateralized mortgage obligations/Residential mortgage-backed securities/Commercial mortgage-backed securities – These debt securities are classified as Level 2. 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 ($355.0 million at March 31, 2021 and $362.8 million at December 31, 2020) and other corporate debt issued by non-financial institutions ($4.4 million at both March 31, 2021 and December 31, 2020). • Auction rate securities – Due to their illiquidity, ARCs are classified as Level 3 investment securities 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. All of the loans underlying the ARCs have principal payments which are guaranteed by the federal government. 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. Derivative assets – Fair value of foreign currency exchange contracts classified as Level 1 assets ($323,000 at both March 31, 2021 and December 31, 2020). 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, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($6.8 million at March 31, 2021 and $8.0 million at December 31, 2020) and the fair value of interest rate swaps ($190.0 million at March 31, 2021 and $331.0 million at December 31, 2020). 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 6 - Derivative Financial Instruments," for additional information. Deferred compensation liabilities – Fair value of amounts due to employees under deferred compensation plans, classified as Level 1 liabilities and are included in other liabilities on the consolidated balance sheets. The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Investments held in Rabbi Trust" above. Derivative liabilities – Level 1 liabilities, representing the fair value of foreign currency exchange contracts ($272,000 at March 31, 2021 and $280,000 at December 31, 2020). Level 2 liabilities, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($316,000 at March 31, 2021 and $2.3 million at December 31, 2020 and the fair value of interest rate swaps ($108.6 million at March 31, 2021 and $165.2 million at December 31, 2020). The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Derivative 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): Single-issuer ARCs Three months ended March 31, 2021 (in thousands) Balance at December 31, 2020 $ — $ 98,206 Sales — (24,619) Unrealized adjustment to fair value (1) — 2,617 Balance at March 31, 2021 $ — $ 76,204 Three months ended March 31, 2020 Balance at December 31, 2019 $ 2,400 $ 101,926 Unrealized adjustment to fair value (1) (242) (8,260) Discount accretion 2 — Balance at March 31, 2020 $ 2,160 $ 93,666 (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 at estimated fair value" on the consolidated balance sheets. 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 Level 3 financial assets measured at fair value on a nonrecurring basis: March 31, 2021 December 31, 2020 (in thousands) Loans, net $ 122,962 $ 116,584 OREO 3,664 4,178 MSRs (1) 33,403 28,245 Total assets $ 160,029 $ 149,007 (1) Amounts shown are estimated fair value. MSRs are recorded on the Corporation's consolidated balance sheets at the lower of amortized cost or fair value. See "Note 5 - Mortgage Servicing Rights" for additional information. 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 individually evaluated for impairment and have been classified as Level 3 assets. See "Note 4 - Loans and Allowance for Credit Losses," for additional details. • OREO – This category consists of OREO classified as Level 3 assets, for which the fair values were based on estimated selling prices less estimated selling costs for similar assets in active markets. • MSRs - This category consists of MSRs, which were initially recorded at fair value upon the sale of residential mortgage loans to secondary market investors, and subsequently carried at the lower of amortized cost or fair value. MSRs are amortized as a reduction to servicing income over the estimated lives of the underlying loans. MSRs are stratified by product type and evaluated for impairment by comparing each stratum's carrying amount to its estimated fair value. Fair values are determined at the end of each quarter through a discounted cash flows valuation performed by a third-party valuation expert. Significant inputs to the valuation included expected net servicing income, the discount rate and the expected life of the underlying loans. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. The weighted average annual constant prepayment rate and the weighted average discount rate used in the March 31, 2021 valuation were 15.3% and 9.5%, respectively. Management reviews the reasonableness of the significant inputs to the third-party valuation in comparison to market data. See "Note 5 - Mortgage Servicing Rights," for additional information. In 2007, the Corporation received the Visa Shares in connection with a corporate restructuring undertaken by Visa, Inc. in contemplation of its initial public offering. These securities were considered equity securities without readily determinable fair values. As such, the approximately 133,000 Visa Shares owned were carried at a zero cost basis. During the first quarter of 2021, the Corporation sold all of its Visa Shares and recognized a $34.0 million gain. The following tables present the carrying amounts and estimated fair values of the Corporation’s financial instruments for the current period. A general description of the methods and assumptions used to estimate such fair values follows: March 31, 2021 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,661,876 $ 1,661,876 $ — $ — $ 1,661,876 FRB and FHLB stock 66,209 — 66,209 — 66,209 Loans held for sale 34,092 — 34,092 — 34,092 AFS securities 2,758,597 — 2,682,393 76,204 2,758,597 HTM securities 853,413 — 843,743 — 843,743 Net Loans 18,725,000 — — 18,354,532 18,354,532 Accrued interest receivable 65,649 65,649 — — 65,649 Other assets 510,534 276,659 196,808 37,067 510,534 FINANCIAL LIABILITIES Demand and savings deposits $ 19,250,538 $ 19,250,538 $ — $ — $ 19,250,538 Brokered deposits 309,873 289,873 21,001 — 310,874 Time deposits 2,073,427 — 2,087,663 — 2,087,663 Short-term borrowings 520,989 520,989 — — 520,989 Accrued interest payable 5,618 5,618 — — 5,618 Long-term borrowings 626,407 — 607,577 — 607,577 Other liabilities 297,069 173,899 108,897 14,273 297,069 December 31, 2020 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,847,832 $ 1,847,832 $ — $ — $ 1,847,832 FRB and FHLB stock 92,129 — 92,129 — 92,129 Loans held for sale 83,886 — 83,886 — 83,886 AFS securities 3,062,143 — 2,963,937 98,206 3,062,143 HTM securities 278,281 — 296,857 — 296,857 Net Loans 18,623,253 — — 18,354,532 18,354,532 Accrued interest receivable 72,942 72,942 — — 72,942 Other assets 650,425 279,015 338,987 32,423 650,425 FINANCIAL LIABILITIES Demand and savings deposits $ 18,279,358 $ 18,279,358 $ — $ — $ 18,279,358 Brokered deposits 335,185 295,185 41,206 — 336,391 Time deposits 2,224,665 — 2,246,457 — 2,246,457 Short-term borrowings 630,066 630,066 — — 630,066 Accrued interest payable 10,365 10,365 — — 10,365 Long-term borrowings 1,296,263 — 1,332,041 — 1,332,041 Other liabilities 338,747 156,869 167,505 14,373 338,747 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 cash equivalents Demand and savings deposits Accrued interest receivable Short-term borrowings Accrued interest payable FRB and FHLB stock represent restricted investments and are carried at cost on the consolidated balance sheets, which is a reasonable estimate of fair value. As of March 31, 2021, 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, which represents estimated exit prices. Brokered deposits consists of demand and saving deposits, which are classified as Level 1, and time deposits, which are classified as Level 2. The fair value of these deposits are determined in a manner consistent with the respective type of deposits discussed above.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share Basic net income per share is calculated as net income available to common shareholders divided by the weighted average number of shares outstanding. Diluted net income per share is calculated as net income available to common shareholders 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, RSUs, and PSUs. PSUs are required to be included in weighted average diluted 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 and diluted net income per share follows (in thousands, except per share data): Three months ended March 31 2021 2020 Weighted average shares outstanding (basic) 162,441 163,475 Impact of common stock equivalents 1,296 942 Weighted average shares outstanding (diluted) 163,737 164,417 Per share: Basic $ 0.43 $ 0.16 Diluted 0.43 0.16

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Corporation grants equity awards to employees in the form of stock options, restricted stock, RSUs or PSUs under its Amended and Restated Equity and Cash Incentive Compensation Plan ("Employee Equity Plan"). Recent grants of equity awards under the Employee Equity Plan have generally been limited to RSUs and PSUs. 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 and subsidiary bank boards of directors under the 2011 Directors’ Equity Participation Plan, which was amended and approved by shareholders as the Amended and Restated Directors’ Equity Participation Plan in 2019 ("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, RSUs or common stock. Recent grants of equity awards under the Directors’ Plan have been limited to RSUs. Equity awards 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 are generally granted annually and become fully vested after a one-year vesting period. Certain events, as defined in the Employee Equity Plan and the Directors' Plan, result in the acceleration of the vesting of equity awards. Fair values for RSUs and a majority of PSUs are based on the trading price of the Corporation’s stock on the date of grant and earn dividend equivalents during the vesting period, which are forfeitable if the awards do not vest. The fair value of certain PSUs are estimated through the use of the Monte Carlo valuation methodology as of the date of grant. As of March 31, 2021, the Employee Equity Plan had 9.3 million shares reserved for future grants through 2023, and the Directors’ Plan had approximately 176,000 shares reserved for future grants through 2029. The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended March 31 2021 2020 (in thousands) Compensation expense $ 1,902 $ 1,619 Tax benefit (414) (344) Stock-based compensation expense, net of tax benefit $ 1,488 $ 1,275

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended March 31 2021 2020 (in thousands) Interest cost $ 561 $ 681 Expected return on plan assets (1,011) (982) Net amortization and deferral 504 465 Net periodic pension cost $ 54 $ 164 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components: Three months ended March 31 2021 2020 (in thousands) Interest cost $ 8 $ 11 Net accretion and deferral (134) (137) Net periodic benefit $ (126) $ (126)

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
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 Corporation records a reserve for unfunded lending commitments, included in ACL - OBS credit exposures, which represents management’s estimate of credit losses associated with unused commitments to extend credit and letters of credit. As of March 31, 2021 and December 31, 2020, the ACL - OBS credit exposures for unfunded lending commitments was $9.7 million and $9.1 million, respectively. See "Note 4 - Loans and Allowance for Credit Losses," for additional details. The following table presents the Corporation's commitments to extend credit and letters of credit: March 31, December 31, 2020 (in thousands) Commitments to extend credit $ 9,018,523 $ 8,651,055 Standby letters of credit 295,516 298,750 Commercial letters of credit 57,917 56,229 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 losses related to loans sold to investors. As of both March 31, 2021 and December 31, 2020, the total reserve for losses on residential mortgage loans sold was $1.1 million, including reserves for both representation and warranty and credit loss exposures. With the adoption of CECL on January 1, 2020 the reserve for estimated losses on certain residential mortgage loans sold to investors was reclassified to ACL - OBS credit exposures. This reclassification resulted in a $2.1 million increase to ACL - OBS credit exposures and a corresponding decrease to the reserve for estimated losses related to loans sold to investors in the first quarter of 2020. Legal Proceedings The Corporation is involved in various pending and threatened claims and other legal proceedings in the ordinary course of its business activities. 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 with respect to any such matter 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 reasonably estimated by the Corporation, no loss reserve is established. In addition, from time to time, the Corporation is involved in 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 companies. These inquiries or investigations could lead to administrative, civil or criminal proceedings involving the Corporation, and could result in fines, penalties, restitution, other types of sanctions or restrictions, or the need for the Corporation to undertake remedial actions, or to alter its business, financial or accounting practices. The Corporation’s practice is to cooperate fully with regulatory and governmental inquiries and 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 legal proceedings, or regulatory or governmental inquiries or investigations, will not have a material adverse effect on the financial condition of the Corporation. However, legal proceedings, inquiries and investigations 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 in any future period, depending, in part, upon the size of the loss or liability imposed and the operating results for the period, and could have a material adverse effect on the Corporation’s business. In addition, regardless of the ultimate outcome of any such legal proceeding, inquiry or investigation, any such matter could cause the Corporation to incur additional expenses, which could be significant, and possibly material, to the Corporation’s results of operations in any future period. Kress v. Fulton Bank, N.A. On October 15, 2019, a former Fulton Bank teller supervisor, D. Kress filed a putative collective and class action lawsuit on behalf of herself and other teller supervisors, tellers, and other similar non-exempt employees in the U.S. District Court for the District of New Jersey, D. Kress v. Fulton Bank, N.A. , Case No. 1:19-cv-18985. Fulton Bank accepted summons without a formal service of process on January 20, 2020. The lawsuit alleges that Fulton Bank did not record or otherwise account for the amount of time D. Kress and putative collective and class members spent conducting branch opening security procedures. The allegation is that, as a result, Fulton Bank did not properly compensate those employees for their regular and overtime wages. The lawsuit alleges that by doing so, Fulton violated: (i) the federal Fair Labor Standards Act and seeks back overtime wages for a period of three years, liquidated damages and attorney fees and costs; (ii) the New Jersey State Wage and Hour Law and seeks back overtime wages for a period of six years, treble damages and attorney fees and costs; and (iii) the New Jersey Wage Payment Law and seeks back wages for a period of six years, treble damages and attorney fees and costs. The lawsuit also asserts New Jersey common law claims seeking compensatory damages and interest. The Corporation and counsel representing plaintiffs ("Plaintiffs’ Counsel") have reached and executed a formal Settlement Agreement to resolve this lawsuit. Plaintiffs’ Counsel has filed a Motion for Preliminary Approval of Class and Collective Settlement and Provisional Certification of Settlement Class and Collective ("the Motion") with the U.S. District Court for the District of New Jersey ("the Court"). The Corporation is not able to provide any assurance that the Court will grant the Motion. If the Court does grant the Motion, the Settlement Agreement will be administered according to its terms and thereafter subject to final approval by the Court. The financial terms of the Settlement Agreement are not expected to be material to the Corporation. The Corporation established an accrued liability during the third quarter of 2020 for the costs expected to be incurred in connection with the Settlement Agreement.

Long-Term Borrowings

Long-Term Borrowings	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term BorrowingsPursuant to a cash tender offer, the Corporation purchased $75.0 million and $60.0 million of its subordinated notes which mature on November 15, 2024 and its senior notes which mature on March 16, 2022, respectively. The subordinated notes carry a fixed rate of 4.50% and an effective rate of 4.87% and the senior notes carry a fixed rate of 3.60% and an effective rate of 3.95%. The Corporation incurred $11.3 million in debt extinguishment costs and expensed $841,000 of unamortized discount costs. In addition, the Corporation prepaid $536.0 million of long-term FHLB advances and incurred $20.9 million in prepayment penalties.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying unaudited Consolidated Financial Statements of the Corporation have been prepared in conformity with 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 GAAP for complete financial statements. The preparation of financial statements in accordance with 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, 2020. Operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the SEC.
Recently Issued Accounting Standards	CECL Adoption On January 1, 2020, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. The Corporation recorded an increase of $58.3 million to the ACL on January 1, 2020 as a result of the adoption of CECL. Retained earnings decreased $43.8 million and deferred tax assets increased by $12.4 million. Included in the $58.3 million increase to the ACL was $2.1 million for certain OBS credit exposures that was previously recognized in other liabilities before the adoption of CECL. CARES Act and Consolidated Appropriations Act - 2021 On March 27, 2020 the CARES Act was signed into law. The CARES Act includes an option for financial institutions to suspend the requirements of GAAP for certain loan modifications that would otherwise be categorized as a TDR. Certain conditions must be met with respect to the loan modification including that the modification is related to COVID-19 and the modified loan was not more than 30 days past due on December 31, 2019. On December 27, 2020, the 2021 Consolidated Appropriations Act was signed into law and this Act extended the relief for TDR treatment that was set to expire on December 31, 2020 to the earlier of 60 days after the national emergency termination date or January 1, 2022. The Corporation is applying the option under the CARES act for all loan modifications that qualify. Recently Adopted Accounting Standards On January 1, 2021, the Corporation adopted ASC Update 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The Corporation adopted this standards update effective with its March 31, 2021 quarterly report on Form 10-Q and it did not have a material impact on the consolidated financial statements. On January 1, 2021, the Corporation adopted ASC Update 2021-01 Reference Rate Reform (Topic 848) . This update permits entities to apply optional expedients in Topic 848 to derivative instruments modified because of LIBOR transition affected by changes to the interest rates used for discounting, margining or contract price alignment due to reference rate reform. This update was effective upon issuance and entities may elect to apply the guidance to modifications either retrospectively, as of any date from the beginning of any interim period that includes or is subsequent to March 12, 2020, or prospectively to new modifications from any date in an interim period that includes or is subsequent to January 7, 2021. The Corporation adopted this standards update retrospectively effective with its March 31, 2021 quarterly report on Form 10-Q and it did not have a material impact on the consolidated financial statements.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
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 for the periods presented: March 31, 2021 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 953,601 $ 42,412 $ (1,253) $ 994,760 Corporate debt securities 348,162 11,970 (761) 359,371 Collateralized mortgage obligations 390,253 10,633 (1,005) 399,881 Residential mortgage-backed securities 257,409 1,941 (3,986) 255,364 Commercial mortgage-backed securities 668,144 12,455 (7,582) 673,017 Auction rate securities 76,350 — (146) 76,204 Total $ 2,693,919 $ 79,411 $ (14,733) $ 2,758,597 Held to Maturity Residential mortgage-backed securities $ 467,461 $ 16,303 $ (8,025) $ 475,739 Commercial mortgage-backed securities 385,952 — (17,948) 368,004 Total $ 853,413 $ 16,303 $ (25,973) $ 843,743 December 31, 2020 Amortized Gross Gross Estimated Available for Sale (in thousands) State and municipal securities $ 891,327 $ 61,286 $ — $ 952,613 Corporate debt securities 348,391 19,445 (691) 367,145 Collateralized mortgage obligations 491,321 12,560 (115) 503,766 Residential mortgage-backed securities 373,779 4,246 (27) 377,998 Commercial mortgage-backed securities 741,172 22,384 (1,141) 762,415 Auction rate securities 101,510 — (3,304) 98,206 Total $ 2,947,500 $ 119,921 $ (5,278) $ 3,062,143 Held to Maturity Residential mortgage-backed securities $ 278,281 $ 18,576 $ — $ 296,857
Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities	The amortized cost and estimated fair values of debt securities as of March 31, 2021, 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. March 31, 2021 Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (in thousands) Due in one year or less $ 13,107 $ 13,171 $ — $ — Due from one year to five years 37,176 38,417 — — Due from five years to ten years 343,642 355,683 — — Due after ten years 984,188 1,023,064 — — 1,378,113 1,430,335 — — Residential mortgage-backed securities (1) 257,409 255,364 467,461 475,739 Commercial mortgage-backed securities (1) 668,144 673,017 385,952 368,004 Collateralized mortgage obligations (1) 390,253 399,881 — — Total $ 2,693,919 $ 2,758,597 $ 853,413 $ 843,743 (1) Mortgage-backed securities and collateralized mortgage obligations do not have stated maturities and 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 investment securities for the periods presented: Gross Realized Gains Gross Realized Losses Net Gains Three months ended (in thousands) March 31, 2021 $ 34,016 $ (541) $ 33,475 March 31, 2020 117 (71) 46
Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in Continuous Unrealized Loss Position	The following tables present the gross unrealized losses and estimated fair values of investment securities, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: March 31, 2021 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) State and municipal securities 21 $ 88,141 $ (1,253) — $ — $ — $ 88,141 $ (1,253) Corporate debt securities 7 41,956 (582) 2 15,328 (179) 57,284 (761) Collateralized mortgage obligations 2 55,305 (1,005) — — — 55,305 (1,005) Residential mortgage-backed securities 8 173,908 (3,986) — — — 173,908 (3,986) Commercial mortgage-backed securities 10 183,175 (7,582) — — — 183,175 (7,582) Auction rate securities — — — 118 76,204 (146) 76,204 (146) Total available for sale 48 $ 542,485 $ (14,408) 120 $ 91,532 $ (325) $ 634,017 $ (14,733) Held to Maturity Residential mortgage-backed securities 12 $ 205,072 $ (8,025) — $ — $ — $ 205,072 $ (8,025) Commercial mortgage-backed securities 21 368,004 (17,948) — — — 368,004 (17,948) Total 33 $ 573,076 $ (25,973) — $ — $ — $ 573,076 $ (25,973) December 31, 2020 Less than 12 months 12 months or longer Total Number of Securities Estimated Unrealized Number of Securities Estimated Unrealized Estimated Unrealized Available for Sale (in thousands) Corporate debt securities 9 $ 44,528 $ (377) 1 $ 6,871 $ (314) $ 51,399 $ (691) Collateralized mortgage obligations 3 57,601 (115) — — — 57,601 (115) Residential mortgage-backed securities 1 20,124 (27) — — — 20,124 (27) Commercial mortgage-backed securities 9 144,383 (1,141) — — — 144,383 (1,141) Auction rate securities — — — 162 98,206 (3,304) 98,206 (3,304) Total available for sale (1) 22 $ 266,636 $ (1,660) 163 $ 105,077 $ (3,618) $ 371,713 $ (5,278) (1) No HTM securities were in an unrealized loss position as of December 31, 2020.

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Summary of Gross Loans by Type	Net Loans are summarized as follows: March 31, December 31, 2020 (in thousands) Real estate - commercial mortgage $ 7,142,137 $ 7,105,092 Commercial and industrial (1) 5,675,714 5,670,828 Real-estate - residential mortgage 3,254,058 3,141,915 Real-estate - home equity 1,149,958 1,202,913 Real-estate - construction 1,083,494 1,047,218 Consumer 451,857 466,772 Equipment lease financing and other 252,930 284,377 Overdrafts 1,373 4,806 Gross loans 19,011,521 18,923,921 Unearned income (20,535) (23,101) Net Loans $ 18,990,986 $ 18,900,820 (1) Includes PPP loans totaling $1.7 billion and $1.6 billion as of March 31, 2021 and December 31, 2020, respectively.
Schedule of Allowance for Credit Losses	The following table presents the components of the ACL: March 31, 2021 December 31, 2020 (in thousands) ACL - loans $ 265,986 $ 277,567 ACL - OBS credit exposure 14,273 14,373 Total ACL $ 280,259 $ 291,940
Activity in the Allowance for Credit Losses	The following table presents the activity in the ACL: Three months ended March 31 2021 2020 (in thousands) Balance at beginning of period $ 291,940 $ 166,209 Impact of adopting CECL on January 1, 2020 (1) — 58,349 Loans charged off (8,202) (14,003) Recoveries of loans previously charged off 2,021 2,887 Net loans charged off (6,181) (11,116) Provision for credit losses (2) (5,500) 44,029 Balance at end of period $ 280,259 $ 257,471 (1) Includes $12.6 million of reserves for OBS credit exposures as of January 1, 2020. (2) Includes $(100,000) and $3.8 million related to OBS credit exposures for the three months ended March 31, 2021 and 2020, respectively. The following table presents the activity in the ACL - loans by portfolio segment: Real Estate - Commercial and Real Estate - Real Estate - Real Estate Consumer Equipment lease financing, other Total (in thousands) Three months ended March 31, 2021 Balance at December 31, 2020 $ 103,425 $ 74,771 $ 14,232 $ 51,995 $ 15,608 $ 10,905 $ 6,633 $ 277,567 Loans charged off (1,837) (4,319) (212) (192) (39) (635) (968) (8,202) Recoveries of loans previously charged off 174 769 51 95 384 389 159 2,021 Net loans recovered (charged off) (1,663) (3,550) (161) (97) 345 (246) (809) (6,181) Provision for loan losses (1) (786) (27) (341) (1,903) (874) (1,247) (222) (5,400) Balance at March 31, 2021 $ 100,976 $ 71,194 $ 13,730 $ 49,995 $ 15,079 $ 9,412 $ 5,602 $ 265,986 Three months ended March 31, 2020 Balance at December 31, 2019 $ 45,610 $ 68,602 $ 17,744 $ 19,771 $ 4,443 $ 3,762 $ 3,690 $ 163,622 Impact of adopting CECL on January 1, 2020 29,361 (18,576) (65) 21,235 4,015 5,969 3,784 45,723 Loans charged off (855) (10,899) (316) (187) — (1,213) (533) (14,003) Recoveries of loans previously charged off 244 1,734 646 85 70 — 108 2,887 Net loans (charged off) recovered (611) (9,165) 330 (102) 70 (1,213) (425) (11,116) Provision for loan losses (1) 15,959 22,745 (2,756) 1,523 (130) 1,347 1,591 40,279 Balance at March 31, 2020 $ 90,319 $ 63,606 $ 15,253 $ 42,427 $ 8,398 $ 9,865 $ 8,640 $ 238,508 (1) Provision included in the table only includes the portion related to Net Loans.
Total Impaired Loans by Class Segment	The following table presents total non-accrual loans, by class segment: March 31, 2021 December 31, 2020 With a Related Allowance Without a Related Allowance Total With a Related Allowance Without a Related Allowance Total (in thousands) Real estate - commercial mortgage $ 21,107 $ 30,870 $ 51,977 $ 19,909 $ 31,561 $ 51,470 Commercial and industrial 13,012 18,640 31,652 13,937 18,056 31,993 Real estate - residential mortgage 31,203 2,198 33,401 24,590 1,517 26,107 Real estate - home equity 9,368 — 9,368 9,398 190 9,588 Real estate - construction 544 897 1,441 437 958 1,395 Consumer 301 — 301 332 — 332 Equipment lease financing and other 6,462 9,287 15,749 — 16,313 16,313 $ 81,997 $ 61,892 $ 143,889 $ 68,603 $ 68,595 $ 137,198
Financing Receivable Credit Quality Indicators	The following table summarizes designated internal risk rating categories by portfolio segment and loan class, by origination year, in the current period: March 31, 2021 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2021 2020 2019 2018 2017 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 14,615 $ 233,770 $ 201,440 $ 218,467 $ 80,686 $ 142,339 $ 36,046 $ — $ 927,363 Special Mention 110 — — — — 13,195 — — 13,305 Substandard or Lower — — 154 — 1,976 3,520 406 — 6,056 Total real estate - construction 14,725 233,770 201,594 218,467 82,662 159,054 36,452 — 946,724 Real estate - construction (1) Current period gross charge-offs — — (39) — — — — — (39) Current period recoveries — — — — — 384 — — 384 Total net (charge-offs) recoveries — — (39) — — 384 — — 345 Commercial and industrial Pass 885,616 1,624,535 481,038 290,788 201,910 726,981 1,205,065 — 5,415,933 Special Mention 143 9,136 20,949 16,337 10,413 30,861 48,939 — 136,778 Substandard or Lower — 2,847 7,167 13,503 10,638 34,805 54,043 — 123,003 Total commercial and industrial 885,759 1,636,518 509,154 320,628 222,961 792,647 1,308,047 — 5,675,714 Commercial and industrial Current period gross charge-offs — — (613) (2,871) (60) (775) — — (4,319) Current period recoveries — — 37 126 36 570 — — 769 Total net (charge-offs) recoveries — — (576) (2,745) (24) (205) — — (3,550) Real estate - commercial mortgage Pass 200,885 993,776 926,352 670,684 767,399 2,800,409 49,207 321 6,409,033 Special Mention — 23,282 30,629 92,800 75,417 248,403 2,406 — 472,937 Substandard or Lower — 1,028 24,008 10,673 46,460 174,421 3,577 — 260,167 Total real estate - commercial mortgage 200,885 1,018,086 980,989 774,157 889,276 3,223,233 55,190 321 7,142,137 Real estate - commercial mortgage Current period gross charge-offs — — — — (1,719) (118) — — (1,837) Current period recoveries — — — — — 174 — — 174 Total net (charge-offs) recoveries — — — — (1,719) 56 — — (1,663) Total Pass $ 1,101,116 $ 2,852,081 $ 1,608,830 $ 1,179,939 $ 1,049,995 $ 3,669,729 $ 1,290,318 $ 321 $ 12,752,329 Special Mention 253 32,418 51,578 109,137 85,830 292,459 51,345 — 623,020 Substandard or Lower — 3,875 31,329 24,176 59,074 212,746 58,026 — 389,226 Total $ 1,101,369 $ 2,888,374 $ 1,691,737 $ 1,313,252 $ 1,194,899 $ 4,174,934 $ 1,399,689 $ 321 $ 13,764,575 (1) Excludes real estate - construction - other. 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 equipment lease financing. 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 ACL methodology for those loans, which bases the PD on this migration. The following table summarizes designated internal risk rating categories by portfolio segment and loan class, by origination year, in the prior period: December 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - construction (1) Pass $ 185,883 $ 229,097 $ 217,604 $ 81,086 $ 37,976 $ 110,470 $ 38,026 $ — $ 900,142 Special Mention — — — — 7,047 6,212 — — 13,259 Substandard or Lower — 447 — 2,000 753 1,637 632 — 5,469 Total real estate - construction 185,883 229,544 217,604 83,086 45,776 118,319 38,658 — 918,870 Real estate - construction (1) Current period gross charge-offs — — — — — (17) — — (17) Current period recoveries — — — — 68 5,054 — — 5,122 Total net (charge-offs) recoveries — — — — 68 5,037 — — 5,105 Commercial and industrial Pass 2,283,533 508,541 298,567 214,089 208,549 596,646 1,278,689 — 5,388,614 Special Mention 6,633 23,834 29,167 10,945 11,506 25,960 45,994 — 154,039 Substandard or Lower 3,221 5,947 8,434 11,251 11,192 23,852 64,278 — 128,175 Total commercial and industrial 2,293,387 538,322 336,168 236,285 231,247 646,458 1,388,961 — 5,670,828 Commercial and industrial Current period gross charge-offs — (114) (30) (488) (393) (520) (17,370) — (18,915) Current period recoveries — 43 486 216 162 4,531 5,958 — 11,396 Total net (charge-offs) recoveries — (71) 456 (272) (231) 4,011 (11,412) — (7,519) Real estate - commercial mortgage Pass 973,664 917,510 708,946 794,955 783,094 2,213,343 53,041 404 6,444,957 Special Mention 13,639 40,874 84,047 80,705 89,112 167,424 2,364 — 478,165 Substandard or Lower 1,238 6,681 6,247 39,027 22,605 103,007 2,225 940 181,970 Total real estate - commercial mortgage 988,541 965,065 799,240 914,687 894,811 2,483,774 57,630 1,344 7,105,092 Real estate - commercial mortgage Current period gross charge-offs (60) (21) (36) (2,515) (29) (1,547) (17) — (4,225) Current period recoveries — 6 — — 1 1,020 — — 1,027 Total net (charge-offs) recoveries (60) (15) (36) (2,515) (28) (527) (17) — (3,198) Total Pass $ 3,443,080 $ 1,655,148 $ 1,225,117 $ 1,090,130 $ 1,029,619 $ 2,920,459 $ 1,369,756 $ 404 $ 12,733,713 Special Mention 20,272 64,708 113,214 91,650 107,665 199,596 48,358 — 645,463 Substandard or Lower 4,459 13,075 14,681 52,278 34,550 128,496 67,135 940 315,614 Total $ 3,467,811 $ 1,732,931 $ 1,353,012 $ 1,234,058 $ 1,171,834 $ 3,248,551 $ 1,485,249 $ 1,344 $ 13,694,790 (1) Excludes real estate - construction - other. March 31, 2021 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2021 2020 2019 2018 2017 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 4,491 $ 29,767 $ 8,140 $ 12,312 $ 9,997 $ 119,037 $ 948,645 $ 4,845 $ 1,137,234 Nonperforming — — 88 23 264 2,597 9,545 207 12,724 Total real estate - home equity 4,491 29,767 8,228 12,335 10,261 121,634 958,190 5,052 1,149,958 Real estate - home equity Current period gross charge-offs — — — — — — (212) — (212) Current period recoveries — — — — — — 51 — 51 Total net (charge-offs) recoveries — — — — — — (161) — (161) Real estate - residential mortgage Performing 358,906 1,240,446 513,892 181,509 292,014 630,996 — — 3,217,763 Nonperforming — 3,927 1,654 3,450 2,945 24,319 — — 36,295 Total real estate - residential mortgage 358,906 1,244,373 515,546 184,959 294,959 655,315 — — 3,254,058 Real estate - residential mortgage Current period gross charge-offs — — (40) (47) — (105) — — (192) Current period recoveries — — — 3 1 — 92 — 96 Total net (charge-offs) recoveries — — (40) (44) 1 (105) 92 — (96) Consumer Performing 27,910 103,924 90,185 85,837 38,190 56,885 48,371 — 451,302 Nonperforming — 127 37 63 35 243 50 — 555 Total consumer 27,910 104,051 90,222 85,900 38,225 57,128 48,421 — 451,857 Consumer Current period gross charge-offs — (95) (94) (111) (79) (229) (27) — (635) Current period recoveries — 33 5 11 19 321 — — 389 Total net (charge-offs) recoveries — (62) (89) (100) (60) 92 (27) — (246) Equipment lease financing and other Performing 25,663 68,641 51,804 36,350 22,506 13,054 — — 218,018 Nonperforming — — — — 15,724 26 — — 15,750 Total leasing and other 25,663 68,641 51,804 36,350 38,230 13,080 — — 233,768 Equipment lease financing and other Current period gross charge-offs — (968) — — — — — — (968) Current period recoveries — 120 39 — — — — — 159 Total net (charge-offs) recoveries — (848) 39 — — — — — (809) Construction - other Performing 17,458 97,829 16,172 4,755 — 16 — — 136,230 Nonperforming — — 364 — 176 — — — 540 Total construction - other 17,458 97,829 16,536 4,755 176 16 — — 136,770 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 434,428 $ 1,540,607 $ 680,193 $ 320,763 $ 362,707 $ 819,988 $ 997,016 $ 4,845 $ 5,160,547 Nonperforming — 4,054 2,143 3,536 19,144 27,185 9,595 207 65,864 Total $ 434,428 $ 1,544,661 $ 682,336 $ 324,299 $ 381,851 $ 847,173 $ 1,006,611 $ 5,052 $ 5,226,411 December 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans converted to Term Loans (dollars in thousands) Amortized Amortized 2020 2019 2018 2017 2016 Prior Cost Basis Cost Basis Total Real estate - home equity Performing $ 31,445 $ 8,176 $ 13,906 $ 11,024 $ 11,667 $ 126,749 $ 982,285 $ 5,321 $ 1,190,573 Nonperforming — 88 23 233 221 2,290 9,485 — 12,340 Total real estate - home equity 31,445 8,264 13,929 11,257 11,888 129,039 991,770 5,321 1,202,913 Real estate - home equity Current period gross charge-offs — — — — — (34) (1,159) — (1,193) Current period recoveries — — — — — 138 366 — 504 Total net (charge-offs) recoveries — — — — — 104 (793) — (689) Real estate - residential mortgage Performing 1,255,532 585,878 228,398 341,563 264,990 434,889 — — 3,111,250 Nonperforming 217 2,483 3,177 2,483 722 21,583 — — 30,665 Total real estate - residential mortgage 1,255,749 588,361 231,575 344,046 265,712 456,472 — — 3,141,915 Real estate - residential mortgage Current period gross charge-offs — (68) (101) (190) (7) (254) — — (620) Current period recoveries — 68 16 1 1 405 — — 491 Total net (charge-offs) recoveries — — (85) (189) (6) 151 — — (129) Consumer Performing 114,399 98,587 95,072 43,334 25,804 36,086 52,698 42 466,022 Nonperforming 168 19 124 141 114 150 34 — 750 Total consumer 114,567 98,606 95,196 43,475 25,918 36,236 52,732 42 466,772 Consumer Current period gross charge-offs (134) (542) (524) (444) (489) (769) (498) — (3,400) Current period recoveries — 64 165 159 94 101 1,292 — 1,875 Total net (charge-offs) recoveries (134) (478) (359) (285) (395) (668) 794 — (1,525) Equipment lease financing and other Performing 102,324 65,303 49,453 34,995 15,631 5,040 — — 272,746 Nonperforming — — 30 15,983 142 282 — — 16,437 Total leasing and other 102,324 65,303 49,483 50,978 15,773 5,322 — — 289,183 Equipment lease financing and other Current period gross charge-offs (606) (1,581) — — — — — — (2,187) Current period recoveries 185 349 21 18 11 21 — — 605 Total net (charge-offs) recoveries (421) (1,232) 21 18 11 21 — — (1,582) Construction - other Performing 96,444 24,888 6,822 — 16 — — — 128,170 Nonperforming — — — 178 — — — — 178 Total construction - other 96,444 24,888 6,822 178 16 — — — 128,348 Construction - other Current period gross charge-offs — — — — — — — — — Current period recoveries — — — — — — — — — Total net (charge-offs) recoveries — — — — — — — — — Total Performing $ 1,600,144 $ 782,832 $ 393,651 $ 430,916 $ 318,108 $ 602,764 $ 1,034,983 $ 5,363 $ 5,168,761 Nonperforming 385 2,590 3,354 19,018 1,199 24,305 9,519 — 60,370 Total $ 1,600,529 $ 785,422 $ 397,005 $ 449,934 $ 319,307 $ 627,069 $ 1,044,502 $ 5,363 $ 5,229,131
Non-Performing Assets	The following table presents non-performing assets: March 31, December 31, (in thousands) Non-accrual loans $ 143,889 $ 137,198 Loans 90 days or more past due and still accruing 8,559 9,929 Total non-performing loans 152,448 147,127 OREO (1) 3,664 4,178 Total non-performing assets $ 156,112 $ 151,305 (1) Excludes $7.6 million and $8.1 million of residential mortgage properties for which formal foreclosure proceedings were in process as of March 31, 2021 and December 31, 2020, respectively.
Past due Loan Status and Non-Accrual Loans by Portfolio Segment	The following tables present the aging of the amortized cost basis of loans, by class segment: 30-59 60-89 ≥ 90 Days Days Past Days Past Past Due Non- Due Due and Accruing Accrual Current Total (in thousands) March 31, 2021 Real estate – commercial mortgage $ 9,596 $ 1,516 $ 2,187 $ 51,977 $ 7,076,861 $ 7,142,137 Commercial and industrial 1,718 1,894 219 31,652 5,640,231 5,675,714 Real estate – residential mortgage 8,485 933 2,750 33,401 3,208,489 3,254,058 Real estate – home equity 2,795 1,062 3,148 9,368 1,133,585 1,149,958 Real estate – construction 170 — — 1,441 1,081,883 1,083,494 Consumer 1,224 491 255 301 449,586 451,857 Equipment lease financing and other 101 142 — 15,749 217,776 233,768 Total $ 24,089 $ 6,038 $ 8,559 $ 143,889 $ 18,808,411 $ 18,990,986 30-59 Days Past 60-89 ≥ 90 Days Non- Current Total (in thousands) December 31, 2020 Real estate – commercial mortgage $ 14,999 $ 9,273 $ 1,177 $ 51,470 $ 7,028,173 $ 7,105,092 Commercial and industrial 11,285 1,068 616 31,993 5,625,866 5,670,828 Real estate – residential mortgage 22,281 7,675 4,687 26,107 3,081,165 3,141,915 Real estate – home equity 5,622 1,654 2,753 9,588 1,183,296 1,202,913 Real estate – construction 1,938 — 155 1,395 1,043,730 1,047,218 Consumer 3,036 501 417 332 462,486 466,772 Equipment lease financing and other 838 150 124 16,313 248,657 266,082 Total $ 59,999 $ 20,321 $ 9,929 $ 137,198 $ 18,673,373 $ 18,900,820
Troubled Debt Restructurings on Financing Receivables	The following table presents TDRs, by class segment: March 31, December 31, (in thousands) Real estate - commercial mortgage $ 27,961 $ 28,451 Commercial and industrial 7,041 6,982 Real estate - residential mortgage 18,214 18,602 Real estate - home equity 13,674 14,391 Real estate - construction 154 — Consumer 5 — Total accruing TDRs 67,049 68,426 Non-accrual TDRs (1) 44,986 35,755 Total TDRs $ 112,035 $ 104,181 (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, for loans that were modified during the three months ended March 31, 2021 and 2020: Three months ended March 31 2021 2020 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Commercial and industrial 4 $ 1,894 1 $ 74 Real estate - commercial mortgage 2 4,162 1 392 Real estate - residential mortgage 23 7,626 7 660 Real estate - home equity 5 148 8 577 Real estate - construction 1 154 — — Total 35 $ 13,984 17 $ 1,703

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2021
Transfers and Servicing [Abstract]
Summary of Changes in Mortgage Servicing Rights	The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets: Three months ended March 31 2021 2020 (in thousands) Amortized cost: Balance at beginning of period $ 38,745 $ 39,267 Originations of MSRs 2,811 1,478 Amortization (3,753) (1,891) Balance at end of period $ 37,803 $ 38,854 Valuation allowance: Balance at beginning of period $ (10,500) $ — Reduction (addition) to valuation allowance 6,100 (1,100) Balance at end of period $ (4,400) $ (1,100) Net MSRs at end of period $ 33,403 $ 37,754

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Notional Amounts and Fair Values of Derivative Financial Instruments	The following table presents a summary of the notional amounts and fair values of derivative financial instruments: March 31, 2021 December 31, 2020 Notional Asset Notional Asset (in thousands) Interest Rate Locks with Customers Positive fair values $ 274,909 $ 2,198 $ 382,903 $ 8,034 Negative fair values 40,007 (316) 3,154 (35) Forward Commitments Positive fair values 91,264 4,650 — — Negative fair values — — 292,262 (2,263) Interest Rate Swaps with Customers Positive fair values 3,169,658 179,934 3,834,062 330,951 Negative fair values 769,300 (9,721) 45,640 (2) Interest Rate Swaps with Dealer Counterparties Positive fair values 769,300 9,721 45,640 2 Negative fair values 3,169,658 (98,368) 3,834,062 (165,205) Interest Rate Swaps used in Cash Flow Hedges Positive fair values — 305 — — Negative fair values 500,000 (492) — — Foreign Exchange Contracts with Customers Positive fair values 12,196 280 1,121 5 Negative fair values 552 (14) 5,963 (275) Foreign Exchange Contracts with Correspondent Banks Positive fair values 2,821 43 6,372 318 Negative fair values 12,213 (258) 1,422 (5)
Summary of Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income	The following table presents the effect of fair value and cash flow hedge accounting on accumulated other comprehensive income for the three months ended March 31, 2021: Amount of Loss Recognized in OCI on Derivative Amount of Loss Recognized in OCI Included Component Amount of Gain or (Loss) Recognized in OCI Excluded Component Location of Gain or (Loss) Recognized from AOCI into Income Amount of Gain Reclassified from AOCI into Income Amount of Gain Reclassified from AOCI into Income Included Component Amount of Gain or (Loss) Reclassified from AOCI into Income Excluded Component (in thousands) Derivatives in Cash Flow Hedging Relationships: Interest Rate Products $ (2,065) $ (2,065) $ — Interest Income $ 144 $ 144 $ — The following table presents the effect of fair value and cash flow hedge accounting on the consolidated statements of income for the three months ended March 31, 2021: Consolidated Statements of Income Classification Interest Income Total amounts of income line items presented in the consolidated statements of income in which the effects of fair value or cash flow hedges are recorded $ 144 The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships — Interest contracts: Amount of gain reclassified from AOCI into income 144 Amount of gain or (loss) reclassified from AOCI into income as a result that a forecasted transaction is no longer probable of occurring — Amount of Gain Reclassified from AOCI into Income - Included Component 144 Amount of Gain or (Loss) Reclassified from AOCI into Income - Excluded Component —
Summary of Fair Value Gains and Losses on Derivative Financial Instruments	The following table presents a summary of the fair value gains (losses) on derivative financial instruments: Consolidated Statements of Income Classification Three months ended March 31 2021 2020 (in thousands) Mortgage banking derivatives (1) Mortgage banking income $ 796 $ 1,040 Interest rate swaps Other expense (104) 72 Foreign exchange contracts Other income 8 119 Net fair value gains on derivative financial instruments $ 700 $ 1,231 (1) Includes interest rate locks with customers and forward commitments.
Summary of Corporation's Mortgage Loans Held for Sale	The following table presents a summary of mortgage loans held for sale and the impact of the fair value election on the consolidated financial statements as of the periods shown: March 31, December 31, (in thousands) Amortized cost (1) $ 33,801 $ 80,662 Fair value 34,092 83,886 (1) Cost basis of mortgage loans held for sale represents the unpaid principal balance.
Summary of Offsetting Derivative Assets	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2021 Interest rate swap derivative assets $ 189,960 $ (11,779) $ — $ 178,181 Foreign exchange derivative assets with correspondent banks 43 (43) — — Total $ 190,003 $ (11,822) $ — $ 178,181 Interest rate swap derivative liabilities $ 108,581 $ (11,779) $ (96,802) $ — Foreign exchange derivative liabilities with correspondent banks 258 (43) — 215 Total $ 108,839 $ (11,822) $ (96,802) $ 215 December 31, 2020 Interest rate swap derivative assets $ 330,951 $ (2) $ — $ 330,949 Foreign exchange derivative assets with correspondent banks 318 (5) — 313 Total $ 331,269 $ (7) $ — $ 331,262 Interest rate swap derivative liabilities $ 165,205 $ (2) $ (165,203) $ — Foreign exchange derivative liabilities with correspondent banks 5 (5) — — Total $ 165,210 $ (7) $ (165,203) $ — (1) For interest rate swap assets, amounts represent any derivative liability fair values that could be offset in the event of counterparty or customer default. For interest rate swap liabilities, amounts represent any derivative asset fair values that could be offset in the event of counterparty or customer default. (2) Amounts represent cash collateral received from the counterparty or posted by the Corporation on interest rate swap transactions and foreign exchange contracts with financial institution counterparties. Interest rate swaps with customers are collateralized by the same collateral securing the underlying loans to those borrowers. Cash and securities collateral amounts are included in the table only to the extent of the net derivative fair values.
Summary of Offsetting Derivative Liabilities	The following table presents the Corporation's financial instruments that are eligible for offset, and the effects of offsetting, on the consolidated balance sheets: Gross Amounts Gross Amounts Not Offset Recognized on the Consolidated on the Balance Sheets Consolidated Financial Cash Net Balance Sheets Instruments (1) Collateral (2) Amount (in thousands) March 31, 2021 Interest rate swap derivative assets $ 189,960 $ (11,779) $ — $ 178,181 Foreign exchange derivative assets with correspondent banks 43 (43) — — Total $ 190,003 $ (11,822) $ — $ 178,181 Interest rate swap derivative liabilities $ 108,581 $ (11,779) $ (96,802) $ — Foreign exchange derivative liabilities with correspondent banks 258 (43) — 215 Total $ 108,839 $ (11,822) $ (96,802) $ 215 December 31, 2020 Interest rate swap derivative assets $ 330,951 $ (2) $ — $ 330,949 Foreign exchange derivative assets with correspondent banks 318 (5) — 313 Total $ 331,269 $ (7) $ — $ 331,262 Interest rate swap derivative liabilities $ 165,205 $ (2) $ (165,203) $ — Foreign exchange derivative liabilities with correspondent banks 5 (5) — — Total $ 165,210 $ (7) $ (165,203) $ — (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.

Tax Credit Investments (Tables)

Tax Credit Investments (Tables)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Summary Of Affordable Housing Tax Credit Investments And Other Credit Investments	The following table presents the balances of the Corporation's TCIs and related unfunded commitments: March 31, December 31, 2021 2020 Included in other assets: (in thousands) Affordable housing tax credit investment, net $ 145,888 $ 152,203 Other tax credit investments, net 58,782 59,224 Total TCIs, net $ 204,670 $ 211,427 Included in other liabilities: Unfunded affordable housing tax credit commitments $ 30,762 $ 31,562 Other tax credit liabilities 49,491 49,491 Total unfunded tax credit commitments and liabilities $ 80,253 $ 81,053 The following table presents other information relating to the Corporation's TCIs: Three months ended March 31 2021 2020 Components of income taxes: (in thousands) Affordable housing tax credits and other tax benefits $ (6,488) $ (7,194) Other tax credit investment credits and tax benefits (723) (941) Amortization of affordable housing investments, net of tax benefit 4,366 5,024 Deferred tax expense 160 208 Total net reduction in income tax expense $ (2,685) $ (2,903) Amortization of TCIs: Affordable housing tax credits investment $ 986 $ 1,022 Other tax credit investment amortization 545 428 Total amortization of TCIs $ 1,531 $ 1,450

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Changes in other comprehensive income	The following table presents changes in OCI: Before-Tax Amount Tax Effect Net of Tax Amount Three months ended March 31, 2021 (in thousands) Unrealized loss on securities $ (51,751) $ 11,753 $ (39,999) Reclassification adjustment for securities gains included in net income (1) 487 (110) 377 Amortization of net unrealized losses on AFS securities transferred to HTM (2) 2,312 (525) 1,787 Net unrealized loss on interest rate swaps used in cash flow hedges (3) (2,209) 502 (1,707) Amortization of net unrecognized pension and postretirement items (4) 370 (81) 289 Total OCI $ (50,791) $ 11,538 $ (39,253) Three months ended March 31, 2020 Unrealized gain on securities $ 22,380 $ (4,949) $ 17,431 Reclassification adjustment for securities gains included in net income (1) (46) 10 (36) Amortization of net unrealized losses on AFS securities transferred to HTM (2) 1,022 (227) 795 Amortization of net unrecognized pension and postretirement items (4) 328 (73) 255 Total OCI $ 23,684 $ (5,239) $ 18,445 (1) Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details. (2) Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Amounts reclassified out of AOCI. Before-tax amounts included in "Interest Income" on the Consolidated Statements of Income. (4) Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "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 Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges Unrecognized Pension and Postretirement Plan Income (Costs) Total (in thousands) Three months ended March 31, 2021 Balance at December 31, 2020 $ 81,604 $ — $ (16,513) $ 65,091 OCI before reclassifications (39,999) — — (39,999) Amounts reclassified from AOCI 377 (1,707) 289 (1,042) Amortization of net unrealized losses on AFS securities transferred to HTM 1,787 — — 1,787 Balance at March 31, 2021 $ 43,769 $ (1,707) $ (16,224) $ 25,838 Three months ended March 31, 2020 Balance at December 31, 2019 $ 14,864 $ — $ (15,001) $ (137) OCI before reclassifications 17,431 — — 17,431 Amounts reclassified from AOCI (36) — 255 219 Amortization of net unrealized losses on AFS securities transferred to HTM 795 — — 795 Balance at March 31, 2020 $ 33,054 $ — $ (14,746) $ 18,308

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets: March 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 34,092 $ — $ 34,092 Available for sale investment securities: State and municipal securities — 994,760 — 994,760 Corporate debt securities — 359,371 — 359,371 Collateralized mortgage obligations — 399,881 — 399,881 Residential mortgage-backed securities — 255,364 — 255,364 Commercial mortgage-backed securities — 673,017 — 673,017 Auction rate securities — — 76,204 76,204 Total available for sale investment securities — 2,682,393 76,204 2,758,597 Other assets: Investments held in Rabbi Trust 25,374 — — 25,374 Derivative assets 323 196,808 — 197,131 Total assets $ 25,697 $ 2,913,293 $ 76,204 $ 3,015,194 Other liabilities: Deferred compensation liabilities $ 25,374 $ — $ — $ 25,374 Derivative liabilities 272 108,897 — 109,169 Total liabilities $ 25,646 $ 108,897 $ — $ 134,543 December 31, 2020 Level 1 Level 2 Level 3 Total (in thousands) Loans held for sale $ — $ 83,886 $ — $ 83,886 Available for sale investment securities: State and municipal securities — 952,613 — 952,613 Corporate debt securities — 367,145 — 367,145 Collateralized mortgage obligations — 503,766 — 503,766 Residential mortgage-backed securities — 377,998 — 377,998 Commercial mortgage-backed securities — 762,415 — 762,415 Auction rate securities — — 98,206 98,206 Total available for sale investment securities — 2,963,937 98,206 3,062,143 Other assets: Investments held in Rabbi Trust 24,383 — — 24,383 Derivative assets 323 338,987 — 339,310 Total assets $ 24,706 $ 3,386,810 $ 98,206 $ 3,509,722 Other liabilities: Deferred compensation liabilities $ 24,383 $ — $ — $ 24,383 Derivative liabilities 280 167,505 — 167,785 Total liabilities $ 24,663 $ 167,505 $ — $ 192,168
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): Single-issuer ARCs Three months ended March 31, 2021 (in thousands) Balance at December 31, 2020 $ — $ 98,206 Sales — (24,619) Unrealized adjustment to fair value (1) — 2,617 Balance at March 31, 2021 $ — $ 76,204 Three months ended March 31, 2020 Balance at December 31, 2019 $ 2,400 $ 101,926 Unrealized adjustment to fair value (1) (242) (8,260) Discount accretion 2 — Balance at March 31, 2020 $ 2,160 $ 93,666 (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 at estimated fair value" on the consolidated balance sheets.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis: March 31, 2021 December 31, 2020 (in thousands) Loans, net $ 122,962 $ 116,584 OREO 3,664 4,178 MSRs (1) 33,403 28,245 Total assets $ 160,029 $ 149,007
Details of Book Value and Fair Value of Financial Instruments	The following tables present the carrying amounts and estimated fair values of the Corporation’s financial instruments for the current period. A general description of the methods and assumptions used to estimate such fair values follows: March 31, 2021 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,661,876 $ 1,661,876 $ — $ — $ 1,661,876 FRB and FHLB stock 66,209 — 66,209 — 66,209 Loans held for sale 34,092 — 34,092 — 34,092 AFS securities 2,758,597 — 2,682,393 76,204 2,758,597 HTM securities 853,413 — 843,743 — 843,743 Net Loans 18,725,000 — — 18,354,532 18,354,532 Accrued interest receivable 65,649 65,649 — — 65,649 Other assets 510,534 276,659 196,808 37,067 510,534 FINANCIAL LIABILITIES Demand and savings deposits $ 19,250,538 $ 19,250,538 $ — $ — $ 19,250,538 Brokered deposits 309,873 289,873 21,001 — 310,874 Time deposits 2,073,427 — 2,087,663 — 2,087,663 Short-term borrowings 520,989 520,989 — — 520,989 Accrued interest payable 5,618 5,618 — — 5,618 Long-term borrowings 626,407 — 607,577 — 607,577 Other liabilities 297,069 173,899 108,897 14,273 297,069 December 31, 2020 Estimated Fair Value Carrying Amount Level 1 Level 2 Level 3 Total (in thousands) FINANCIAL ASSETS Cash and cash equivalents $ 1,847,832 $ 1,847,832 $ — $ — $ 1,847,832 FRB and FHLB stock 92,129 — 92,129 — 92,129 Loans held for sale 83,886 — 83,886 — 83,886 AFS securities 3,062,143 — 2,963,937 98,206 3,062,143 HTM securities 278,281 — 296,857 — 296,857 Net Loans 18,623,253 — — 18,354,532 18,354,532 Accrued interest receivable 72,942 72,942 — — 72,942 Other assets 650,425 279,015 338,987 32,423 650,425 FINANCIAL LIABILITIES Demand and savings deposits $ 18,279,358 $ 18,279,358 $ — $ — $ 18,279,358 Brokered deposits 335,185 295,185 41,206 — 336,391 Time deposits 2,224,665 — 2,246,457 — 2,246,457 Short-term borrowings 630,066 630,066 — — 630,066 Accrued interest payable 10,365 10,365 — — 10,365 Long-term borrowings 1,296,263 — 1,332,041 — 1,332,041 Other liabilities 338,747 156,869 167,505 14,373 338,747

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Reconciliation of Weighted Average Common Shares Outstanding	A reconciliation of weighted average shares outstanding used to calculate basic and diluted net income per share follows (in thousands, except per share data): Three months ended March 31 2021 2020 Weighted average shares outstanding (basic) 162,441 163,475 Impact of common stock equivalents 1,296 942 Weighted average shares outstanding (diluted) 163,737 164,417 Per share: Basic $ 0.43 $ 0.16 Diluted 0.43 0.16

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of Compensation Expense and Related Tax Benefits	The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income: Three months ended March 31 2021 2020 (in thousands) Compensation expense $ 1,902 $ 1,619 Tax benefit (414) (344) Stock-based compensation expense, net of tax benefit $ 1,488 $ 1,275

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components: Three months ended March 31 2021 2020 (in thousands) Interest cost $ 561 $ 681 Expected return on plan assets (1,011) (982) Net amortization and deferral 504 465 Net periodic pension cost $ 54 $ 164 The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components: Three months ended March 31 2021 2020 (in thousands) Interest cost $ 8 $ 11 Net accretion and deferral (134) (137) Net periodic benefit $ (126) $ (126)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Summary of Outstanding Commitments to Extend Credit and Letters of Credit	The following table presents the Corporation's commitments to extend credit and letters of credit: March 31, December 31, 2020 (in thousands) Commitments to extend credit $ 9,018,523 $ 8,651,055 Standby letters of credit 295,516 298,750 Commercial letters of credit 57,917 56,229

Basis of Presentation Narrative

Basis of Presentation Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL	$ 280,259	$ 291,940	$ 257,471		$ 166,209
Change in retained earnings	(1,168,491)	(1,120,781)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL		0			$ 58,349
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL				$ 58,300
Change in retained earnings				43,800
Increase in deferred tax assets				12,400
Residential Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure	$ 1,100	$ 1,100
Residential Mortgage | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure				(2,100)
Residential Mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in ACL for certain OBS credit exposure				$ (2,100)

Restrictions on Cash and Cash_2

Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Collateral	$ 243.6	$ 408.1

Investment Securities Schedule

Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 2,693,919
Gross Unrealized Gains	79,411
Gross Unrealized Losses	(14,733)
Estimated Fair Value	2,758,597	$ 3,062,143
Amortized Cost, Held to Maturity	853,413	278,281
Gross Unrealized Gains, Held to Maturity	16,303
Gross Unrealized Losses, Held to Maturity	(25,973)
HTM securities	843,743
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	953,601
Gross Unrealized Gains	42,412
Gross Unrealized Losses	(1,253)
Estimated Fair Value	994,760
Amortized Cost, Held to Maturity	376,200
Amortized Cost		891,327
Gross Unrealized Gains		61,286
Gross Unrealized Losses		0
Estimated Fair Value		952,613
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	348,162
Gross Unrealized Gains	11,970
Gross Unrealized Losses	(761)
Estimated Fair Value	359,371
Amortized Cost		348,391
Gross Unrealized Gains		19,445
Gross Unrealized Losses		(691)
Estimated Fair Value		367,145
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	390,253
Gross Unrealized Gains	10,633
Gross Unrealized Losses	(1,005)
Estimated Fair Value	399,881
Amortized Cost		491,321
Gross Unrealized Gains		12,560
Gross Unrealized Losses		(115)
Estimated Fair Value		503,766
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	257,409
Gross Unrealized Gains	1,941
Gross Unrealized Losses	(3,986)
Estimated Fair Value	255,364
Amortized Cost, Held to Maturity	467,461	278,281
Gross Unrealized Gains, Held to Maturity	16,303	18,576
Gross Unrealized Losses, Held to Maturity	(8,025)	0
HTM securities	475,739	296,857
Amortized Cost		373,779
Gross Unrealized Gains		4,246
Gross Unrealized Losses		(27)
Estimated Fair Value		377,998
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	668,144
Gross Unrealized Gains	12,455
Gross Unrealized Losses	(7,582)
Estimated Fair Value	673,017
Amortized Cost, Held to Maturity	385,952
Gross Unrealized Gains, Held to Maturity	0
Gross Unrealized Losses, Held to Maturity	(17,948)
HTM securities	368,004
Amortized Cost		741,172
Gross Unrealized Gains		22,384
Gross Unrealized Losses		(1,141)
Estimated Fair Value		762,415
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	76,350
Gross Unrealized Gains	0
Gross Unrealized Losses	(146)
Estimated Fair Value	$ 76,204
Amortized Cost		101,510
Gross Unrealized Gains		0
Gross Unrealized Losses		(3,304)
Estimated Fair Value		98,206
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,947,500
Gross Unrealized Gains		119,921
Gross Unrealized Losses		(5,278)
Estimated Fair Value		$ 3,062,143

Investment Securities Schedul_2

Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 13,107
Due from one year to five years	37,176
Due from five years to ten years	343,642
Due after ten years	984,188
Amortized cost, before securities without debt maturities	1,378,113
Amortized Cost	2,693,919
Estimated Fair Value
Due in one year or less	13,171
Due from one year to five years	38,417
Due from five years to ten years	355,683
Due after ten years	1,023,064
Available for sale securities, debt maturities, before securities without single maturities	1,430,335
Estimated Fair Value	2,758,597	$ 3,062,143
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total	0
Amortized Cost, Held to Maturity	853,413	278,281
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value	0
Estimated Fair Value, Held to Maturity	843,743
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	390,253
Amortized Cost	390,253
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	399,881
Estimated Fair Value	399,881
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	0
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	0
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	668,144
Amortized Cost	668,144
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	673,017
Estimated Fair Value	673,017
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	385,952
Amortized Cost, Held to Maturity	385,952
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	368,004
Estimated Fair Value, Held to Maturity	368,004
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	257,409
Amortized Cost	257,409
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	255,364
Estimated Fair Value	255,364
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	467,461
Amortized Cost, Held to Maturity	467,461	278,281
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	475,739
Estimated Fair Value, Held to Maturity	$ 475,739	$ 296,857

Investment Securities Summary o

Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt securities, Gross Realized Gains	$ 34,016	$ 117
Debt securities, Gross Realized Losses	(541)	(71)
Debt securities, Net Gains (Losses)	$ 33,475	$ 46

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) $ in Thousands	Mar. 31, 2021USD ($)Security	Dec. 31, 2020USD ($)Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	48	22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 542,485	$ 266,636
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (14,408)	$ (1,660)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	120	163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 91,532	$ 105,077
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(325)	(3,618)
Debt Securities, Available-for-sale, Unrealized Loss Position	634,017	371,713
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (14,733)	$ (5,278)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	33
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 573,076
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (25,973)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	573,076
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (25,973)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 88,141
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,253)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	88,141
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1,253)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	7	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 41,956	$ 44,528
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (582)	$ (377)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	2	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 15,328	$ 6,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(179)	(314)
Debt Securities, Available-for-sale, Unrealized Loss Position	57,284	51,399
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (761)	$ (691)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	2	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 55,305	$ 57,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,005)	$ (115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	55,305	57,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1,005)	$ (115)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	8	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 173,908	$ 20,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (3,986)	$ (27)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	173,908	20,124
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (3,986)	$ (27)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	12
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 205,072
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (8,025)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	205,072
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (8,025)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	10	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 183,175	$ 144,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7,582)	$ (1,141)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	183,175	144,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (7,582)	$ (1,141)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	21
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 368,004
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (17,948)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	368,004
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (17,948)
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	118	162
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 76,204	$ 98,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(146)	(3,304)
Debt Securities, Available-for-sale, Unrealized Loss Position	76,204	98,206
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (146)	$ (3,304)

Investment Securities Summary_2

Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,693,919
Estimated Fair Value	2,758,597	$ 3,062,143
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	348,162
Estimated Fair Value	$ 359,371

Investment Securities Narrative

Investment Securities Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized cost	$ 2,693,919
Available-for-sale Securities, Fair Value Disclosure	2,758,597		$ 3,062,143
HTM, at amortized cost	853,413		278,281
HTM securities	843,743
Proceeds from sales of AFS securities	59,342	$ 59,894
Other securities losses	(33,475)	(46)
Debt extinguishment costs	32,200
Interest income	184,936	$ 199,378
Debt extinguishment costs	841
Unrealized Gain (Loss) on Securities	(400)
Visa
Schedule of Investments [Line Items]
Gain on sale of shares	34,000
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	257,409
Available-for-sale Securities, Fair Value Disclosure	255,364
HTM, at amortized cost	467,461		278,281
HTM securities	475,739		296,857
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	953,601
Available-for-sale Securities, Fair Value Disclosure	994,760
HTM, at amortized cost	376,200
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	76,350
Available-for-sale Securities, Fair Value Disclosure	76,204
Proceeds from sales of AFS securities	24,600
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 1,100,000		$ 520,500

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 19,011,521	$ 18,923,921
Unearned income	(20,535)	(23,101)
Net Loans	18,990,986	18,900,820
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	7,142,137	7,105,092
Net Loans	7,142,137	7,105,092
Commercial and industrial (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,675,714	5,670,828
Net Loans	5,675,714	5,670,828
Commercial and industrial (1) | PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,700,000	1,600,000
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,254,058	3,141,915
Net Loans	3,254,058	3,141,915
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,149,958	1,202,913
Net Loans	1,149,958	1,202,913
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,083,494	1,047,218
Net Loans	1,083,494	1,047,218
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	451,857	466,772
Net Loans	451,857	466,772
Equipment lease financing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	252,930	284,377
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,373	$ 4,806

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
ACL - loans	$ 265,986	$ 277,567
ACL - OBS credit exposure	14,273	14,373
Total ACL	$ 280,259	$ 291,940	$ 257,471	$ 166,209

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 291,940	$ 166,209	$ 166,209
Loans charged off	8,202	14,003
Recoveries of loans previously charged off	2,021	2,887
Total net (charge-offs) recoveries	(6,181)	(11,116)
Provision for credit losses	(5,500)	44,029
Ending balance	280,259	257,471	291,940
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	58,349	58,349
Ending balance			$ 0
Off-Balance Sheet
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	$ 100	$ (3,800)

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 291,940	$ 166,209	$ 166,209
Loans charged off	8,202	14,003
Recoveries of loans previously charged off	2,021	2,887
Total net (charge-offs) recoveries	(6,181)	(11,116)
Provision for credit losses	(5,500)	44,029
Ending balance	280,259	257,471	291,940
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	0	58,349	58,349
Ending balance			0
Loans - Excluding OBS Credit Exposure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	277,567	163,622	163,622
Loans charged off	8,202	14,003
Recoveries of loans previously charged off	2,021	2,887
Total net (charge-offs) recoveries	(6,181)	(11,116)
Provision for credit losses	(5,400)	40,279
Ending balance	265,986	238,508	277,567
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	103,425	45,610	45,610
Loans charged off	1,837	855
Recoveries of loans previously charged off	174	244
Total net (charge-offs) recoveries	(1,663)	(611)
Provision for credit losses	(786)	15,959
Ending balance	100,976	90,319	103,425
Loans - Excluding OBS Credit Exposure [Member] | Commercial and industrial (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	74,771	68,602	68,602
Loans charged off	4,319	10,899
Recoveries of loans previously charged off	769	1,734
Total net (charge-offs) recoveries	(3,550)	(9,165)
Provision for credit losses	(27)	22,745
Ending balance	71,194	63,606	74,771
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	14,232	17,744	17,744
Loans charged off	212	316
Recoveries of loans previously charged off	51	646
Total net (charge-offs) recoveries	(161)	330
Provision for credit losses	(341)	(2,756)
Ending balance	13,730	15,253	14,232
Loans - Excluding OBS Credit Exposure [Member] | Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	51,995	19,771	19,771
Loans charged off	192	187
Recoveries of loans previously charged off	95	85
Total net (charge-offs) recoveries	(97)	(102)
Provision for credit losses	(1,903)	1,523
Ending balance	49,995	42,427	51,995
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	15,608	4,443	4,443
Loans charged off	39	0
Recoveries of loans previously charged off	384	70
Total net (charge-offs) recoveries	345	70
Provision for credit losses	(874)	(130)
Ending balance	15,079	8,398	15,608
Loans - Excluding OBS Credit Exposure [Member] | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	10,905	3,762	3,762
Loans charged off	635	1,213
Recoveries of loans previously charged off	389	0
Total net (charge-offs) recoveries	(246)	(1,213)
Provision for credit losses	(1,247)	1,347
Ending balance	9,412	9,865	10,905
Loans - Excluding OBS Credit Exposure [Member] | Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	6,633	3,690	3,690
Loans charged off	968	533
Recoveries of loans previously charged off	159	108
Total net (charge-offs) recoveries	(809)	(425)
Provision for credit losses	(222)	1,591
Ending balance	$ 5,602	8,640	6,633
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		45,723	45,723
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		29,361	29,361
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		(18,576)	(18,576)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		(65)	(65)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		21,235	21,235
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		4,015	4,015
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		5,969	5,969
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		$ 3,784	$ 3,784

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	$ 81,997	$ 68,603
Unpaid principal balance, with no related allowance	61,892	68,595
Unpaid Principal Balance	143,889	137,198
Real estate - commercial mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	21,107	19,909
Unpaid principal balance, with no related allowance	30,870	31,561
Unpaid Principal Balance	51,977	51,470
Commercial
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	13,012	13,937
Unpaid principal balance, with no related allowance	18,640	18,056
Unpaid Principal Balance	31,652	31,993
Real estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	31,203	24,590
Unpaid principal balance, with no related allowance	2,198	1,517
Unpaid Principal Balance	33,401	26,107
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	9,368	9,398
Unpaid principal balance, with no related allowance	0	190
Unpaid Principal Balance	9,368	9,588
Construction
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	544	437
Unpaid principal balance, with no related allowance	897	958
Unpaid Principal Balance	1,441	1,395
Consumer
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	301	332
Unpaid principal balance, with no related allowance	0	0
Unpaid Principal Balance	301	332
Equipment lease financing, other and overdrafts
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	6,462	0
Unpaid principal balance, with no related allowance	9,287	16,313
Unpaid Principal Balance	$ 15,749	$ 16,313

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Total
Current period gross charge-offs	$ (8,202)	$ (14,003)
Current period recoveries	2,021	2,887
Total net (charge-offs) recoveries	6,181	$ 11,116
Portfolio Segment and Loan Class [Member]
2021
Total	1,101,369		$ 3,467,811
2020
Total	2,888,374		1,732,931
2019
Total	1,691,737		1,353,012
2018
Total	1,313,252		1,234,058
2017
Total	1,194,899		1,171,834
Prior
Total	4,174,934		3,248,551
Revolving Loans Amortized Cost Basis
Total	1,399,689		1,485,249
Total
Total	13,764,575		13,694,790
Portfolio Segment and Loan Class [Member] | Pass
2021
Total	1,101,116		3,443,080
2020
Total	2,852,081		1,655,148
2019
Total	1,608,830		1,225,117
2018
Total	1,179,939		1,090,130
2017
Total	1,049,995		1,029,619
Prior
Total	3,669,729		2,920,459
Revolving Loans Amortized Cost Basis
Total	1,290,318		1,369,756
Total
Total	12,752,329		12,733,713
Portfolio Segment and Loan Class [Member] | Special Mention
2021
Total	253		20,272
2020
Total	32,418		64,708
2019
Total	51,578		113,214
2018
Total	109,137		91,650
2017
Total	85,830		107,665
Prior
Total	292,459		199,596
Revolving Loans Amortized Cost Basis
Total	51,345		48,358
Total
Total	623,020		645,463
Portfolio Segment and Loan Class [Member] | Substandard or Lower
2021
Total	0		4,459
2020
Total	3,875		13,075
2019
Total	31,329		14,681
2018
Total	24,176		52,278
2017
Total	59,074		34,550
Prior
Total	212,746		128,496
Revolving Loans Amortized Cost Basis
Total	58,026		67,135
Total
Total	389,226		315,614
Portfolio Segment and Loan Class [Member] | Real estate - construction(1)
2021
Total	14,725		185,883
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2020
Total	233,770		229,544
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2019
Total	201,594		217,604
Current period gross charge-offs	(39)		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	(39)		0
2018
Total	218,467		83,086
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2017
Total	82,662		45,776
Current period gross charge-offs	0		0
Current period recoveries	0		68
Total net (charge-offs) recoveries	0		68
Prior
Total	159,054		118,319
Current period gross charge-offs	0		(17)
Current period recoveries	384		5,054
Total net (charge-offs) recoveries	384		5,037
Revolving Loans Amortized Cost Basis
Total	36,452		38,658
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Total
Total	946,724		918,870
Current period gross charge-offs	(39)		(17)
Current period recoveries	384		5,122
Total net (charge-offs) recoveries	(345)		(5,105)
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass
2021
Total	14,615		185,883
2020
Total	233,770		229,097
2019
Total	201,440		217,604
2018
Total	218,467		81,086
2017
Total	80,686		37,976
Prior
Total	142,339		110,470
Revolving Loans Amortized Cost Basis
Total	36,046		38,026
Total
Total	927,363		900,142
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention
2021
Total	110		0
2020
Total	0		0
2019
Total	0		0
2018
Total	0		0
2017
Total	0		7,047
Prior
Total	13,195		6,212
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	13,305		13,259
Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower
2021
Total	0		0
2020
Total	0		447
2019
Total	154		0
2018
Total	0		2,000
2017
Total	1,976		753
Prior
Total	3,520		1,637
Revolving Loans Amortized Cost Basis
Total	406		632
Total
Total	6,056		5,469
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1)
2021
Total	885,759		2,293,387
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2020
Total	1,636,518		538,322
Current period gross charge-offs	0		(114)
Current period recoveries	0		43
Total net (charge-offs) recoveries	0		(71)
2019
Total	509,154		336,168
Current period gross charge-offs	(613)		(30)
Current period recoveries	37		486
Total net (charge-offs) recoveries	(576)		456
2018
Total	320,628		236,285
Current period gross charge-offs	(2,871)		(488)
Current period recoveries	126		216
Total net (charge-offs) recoveries	(2,745)		(272)
2017
Total	222,961		231,247
Current period gross charge-offs	(60)		(393)
Current period recoveries	36		162
Total net (charge-offs) recoveries	(24)		(231)
Prior
Total	792,647		646,458
Current period gross charge-offs	(775)		(520)
Current period recoveries	570		4,531
Total net (charge-offs) recoveries	(205)		4,011
Revolving Loans Amortized Cost Basis
Total	1,308,047		1,388,961
Current period gross charge-offs	0		(17,370)
Current period recoveries	0		5,958
Total net (charge-offs) recoveries	0		(11,412)
Total
Total	5,675,714		5,670,828
Current period gross charge-offs	(4,319)		(18,915)
Current period recoveries	769		11,396
Total net (charge-offs) recoveries	3,550		7,519
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Pass
2021
Total	885,616		2,283,533
2020
Total	1,624,535		508,541
2019
Total	481,038		298,567
2018
Total	290,788		214,089
2017
Total	201,910		208,549
Prior
Total	726,981		596,646
Revolving Loans Amortized Cost Basis
Total	1,205,065		1,278,689
Total
Total	5,415,933		5,388,614
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Special Mention
2021
Total	143		6,633
2020
Total	9,136		23,834
2019
Total	20,949		29,167
2018
Total	16,337		10,945
2017
Total	10,413		11,506
Prior
Total	30,861		25,960
Revolving Loans Amortized Cost Basis
Total	48,939		45,994
Total
Total	136,778		154,039
Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Substandard or Lower
2021
Total	0		3,221
2020
Total	2,847		5,947
2019
Total	7,167		8,434
2018
Total	13,503		11,251
2017
Total	10,638		11,192
Prior
Total	34,805		23,852
Revolving Loans Amortized Cost Basis
Total	54,043		64,278
Total
Total	123,003		128,175
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage
2021
Total	200,885		988,541
Current period gross charge-offs	0		(60)
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		(60)
2020
Total	1,018,086		965,065
Current period gross charge-offs	0		(21)
Current period recoveries	0		6
Total net (charge-offs) recoveries	0		(15)
2019
Total	980,989		799,240
Current period gross charge-offs	0		(36)
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		(36)
2018
Total	774,157		914,687
Current period gross charge-offs	0		(2,515)
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		(2,515)
2017
Total	889,276		894,811
Current period gross charge-offs	(1,719)		(29)
Current period recoveries	0		1
Total net (charge-offs) recoveries	(1,719)		(28)
Prior
Total	3,223,233		2,483,774
Current period gross charge-offs	(118)		(1,547)
Current period recoveries	174		1,020
Total net (charge-offs) recoveries	56		(527)
Revolving Loans Amortized Cost Basis
Total	55,190		57,630
Current period gross charge-offs	0		(17)
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		(17)
Total
Total	7,142,137		7,105,092
Current period gross charge-offs	(1,837)		(4,225)
Current period recoveries	174		1,027
Total net (charge-offs) recoveries	1,663		3,198
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass
2021
Total	200,885		973,664
2020
Total	993,776		917,510
2019
Total	926,352		708,946
2018
Total	670,684		794,955
2017
Total	767,399		783,094
Prior
Total	2,800,409		2,213,343
Revolving Loans Amortized Cost Basis
Total	49,207		53,041
Total
Total	6,409,033		6,444,957
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention
2021
Total	0		13,639
2020
Total	23,282		40,874
2019
Total	30,629		84,047
2018
Total	92,800		80,705
2017
Total	75,417		89,112
Prior
Total	248,403		167,424
Revolving Loans Amortized Cost Basis
Total	2,406		2,364
Total
Total	472,937		478,165
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower
2021
Total	0		1,238
2020
Total	1,028		6,681
2019
Total	24,008		6,247
2018
Total	10,673		39,027
2017
Total	46,460		22,605
Prior
Total	174,421		103,007
Revolving Loans Amortized Cost Basis
Total	3,577		2,225
Total
Total	260,167		181,970
Payment Activity, Aging Status [Member]
2021
Total	434,428		1,600,529
2020
Total	1,544,661		785,422
2019
Total	682,336		397,005
2018
Total	324,299		449,934
2017
Total	381,851		319,307
Prior
Total	847,173		627,069
Revolving Loans Amortized Cost Basis
Total	1,006,611		1,044,502
Total
Total	5,226,411		5,229,131
Payment Activity, Aging Status [Member] | Performing
2021
Total	434,428		1,600,144
2020
Total	1,540,607		782,832
2019
Total	680,193		393,651
2018
Total	320,763		430,916
2017
Total	362,707		318,108
Prior
Total	819,988		602,764
Revolving Loans Amortized Cost Basis
Total	997,016		1,034,983
Total
Total	5,160,547		5,168,761
Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]
2021
Total	0		385
2020
Total	4,054		2,590
2019
Total	2,143		3,354
2018
Total	3,536		19,018
2017
Total	19,144		1,199
Prior
Total	27,185		24,305
Revolving Loans Amortized Cost Basis
Total	9,595		9,519
Total
Total	65,864		60,370
Payment Activity, Aging Status [Member] | Real-estate - home equity
2021
Total	4,491		31,445
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2020
Total	29,767		8,264
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2019
Total	8,228		13,929
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2018
Total	12,335		11,257
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2017
Total	10,261		11,888
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Prior
Total	121,634		129,039
Current period gross charge-offs	0		(34)
Current period recoveries	0		138
Total net (charge-offs) recoveries	0		104
Revolving Loans Amortized Cost Basis
Total	958,190		991,770
Current period gross charge-offs	(212)		(1,159)
Current period recoveries	51		366
Total net (charge-offs) recoveries	(161)		(793)
Total
Total	1,149,958		1,202,913
Current period gross charge-offs	(212)		(1,193)
Current period recoveries	51		504
Total net (charge-offs) recoveries	161		689
Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing
2021
Total	4,491		31,445
2020
Total	29,767		8,176
2019
Total	8,140		13,906
2018
Total	12,312		11,024
2017
Total	9,997		11,667
Prior
Total	119,037		126,749
Revolving Loans Amortized Cost Basis
Total	948,645		982,285
Total
Total	1,137,234		1,190,573
Payment Activity, Aging Status [Member] | Real-estate - home equity | Nonperforming Financial Instruments [Member]
2021
Total	0		0
2020
Total	0		88
2019
Total	88		23
2018
Total	23		233
2017
Total	264		221
Prior
Total	2,597		2,290
Revolving Loans Amortized Cost Basis
Total	9,545		9,485
Total
Total	12,724		12,340
Payment Activity, Aging Status [Member] | Real estate - residential mortgage
2021
Total	358,906		1,255,749
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2020
Total	1,244,373		588,361
Current period gross charge-offs	0		(68)
Current period recoveries	0		68
Total net (charge-offs) recoveries	0		0
2019
Total	515,546		231,575
Current period gross charge-offs	(40)		(101)
Current period recoveries	0		16
Total net (charge-offs) recoveries	(40)		(85)
2018
Total	184,959		344,046
Current period gross charge-offs	(47)		(190)
Current period recoveries	3		1
Total net (charge-offs) recoveries	(44)		(189)
2017
Total	294,959		265,712
Current period gross charge-offs	0		(7)
Current period recoveries	1		1
Total net (charge-offs) recoveries	1		(6)
Prior
Total	655,315		456,472
Current period gross charge-offs	(105)		(254)
Current period recoveries	0		405
Total net (charge-offs) recoveries	(105)		151
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	92		0
Total net (charge-offs) recoveries	92		0
Total
Total	3,254,058		3,141,915
Current period gross charge-offs	(192)		(620)
Current period recoveries	96		491
Total net (charge-offs) recoveries	96		129
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing
2021
Total	358,906		1,255,532
2020
Total	1,240,446		585,878
2019
Total	513,892		228,398
2018
Total	181,509		341,563
2017
Total	292,014		264,990
Prior
Total	630,996		434,889
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	3,217,763		3,111,250
Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Nonperforming Financial Instruments [Member]
2021
Total	0		217
2020
Total	3,927		2,483
2019
Total	1,654		3,177
2018
Total	3,450		2,483
2017
Total	2,945		722
Prior
Total	24,319		21,583
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	36,295		30,665
Payment Activity, Aging Status [Member] | Consumer
2021
Total	27,910		114,567
Current period gross charge-offs	0		(134)
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		(134)
2020
Total	104,051		98,606
Current period gross charge-offs	(95)		(542)
Current period recoveries	33		64
Total net (charge-offs) recoveries	(62)		(478)
2019
Total	90,222		95,196
Current period gross charge-offs	(94)		(524)
Current period recoveries	5		165
Total net (charge-offs) recoveries	(89)		(359)
2018
Total	85,900		43,475
Current period gross charge-offs	(111)		(444)
Current period recoveries	11		159
Total net (charge-offs) recoveries	(100)		(285)
2017
Total	38,225		25,918
Current period gross charge-offs	(79)		(489)
Current period recoveries	19		94
Total net (charge-offs) recoveries	(60)		(395)
Prior
Total	57,128		36,236
Current period gross charge-offs	(229)		(769)
Current period recoveries	321		101
Total net (charge-offs) recoveries	92		(668)
Revolving Loans Amortized Cost Basis
Total	48,421		52,732
Current period gross charge-offs	(27)		(498)
Current period recoveries	0		1,292
Total net (charge-offs) recoveries	(27)		794
Total
Total	451,857		466,772
Current period gross charge-offs	(635)		(3,400)
Current period recoveries	389		1,875
Total net (charge-offs) recoveries	246		1,525
Payment Activity, Aging Status [Member] | Consumer | Performing
2021
Total	27,910		114,399
2020
Total	103,924		98,587
2019
Total	90,185		95,072
2018
Total	85,837		43,334
2017
Total	38,190		25,804
Prior
Total	56,885		36,086
Revolving Loans Amortized Cost Basis
Total	48,371		52,698
Total
Total	451,302		466,022
Payment Activity, Aging Status [Member] | Consumer | Nonperforming Financial Instruments [Member]
2021
Total	0		168
2020
Total	127		19
2019
Total	37		124
2018
Total	63		141
2017
Total	35		114
Prior
Total	243		150
Revolving Loans Amortized Cost Basis
Total	50		34
Total
Total	555		750
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts
2021
Total	25,663		102,324
Current period gross charge-offs	0		(606)
Current period recoveries	0		185
Total net (charge-offs) recoveries	0		(421)
2020
Total	68,641		65,303
Current period gross charge-offs	(968)		(1,581)
Current period recoveries	120		349
Total net (charge-offs) recoveries	(848)		(1,232)
2019
Total	51,804		49,483
Current period gross charge-offs	0		0
Current period recoveries	39		21
Total net (charge-offs) recoveries	39		21
2018
Total	36,350		50,978
Current period gross charge-offs	0		0
Current period recoveries	0		18
Total net (charge-offs) recoveries	0		18
2017
Total	38,230		15,773
Current period gross charge-offs	0		0
Current period recoveries	0		11
Total net (charge-offs) recoveries	0		11
Prior
Total	13,080		5,322
Current period gross charge-offs	0		0
Current period recoveries	0		21
Total net (charge-offs) recoveries	0		21
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Total
Total	233,768		289,183
Current period gross charge-offs	(968)		(2,187)
Current period recoveries	159		605
Total net (charge-offs) recoveries	809		1,582
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing
2021
Total	25,663		102,324
2020
Total	68,641		65,303
2019
Total	51,804		49,453
2018
Total	36,350		34,995
2017
Total	22,506		15,631
Prior
Total	13,054		5,040
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	218,018		272,746
Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Nonperforming Financial Instruments [Member]
2021
Total	0		0
2020
Total	0		0
2019
Total	0		30
2018
Total	0		15,983
2017
Total	15,724		142
Prior
Total	26		282
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	15,750		16,437
Payment Activity, Aging Status [Member] | Construction - other
2021
Total	17,458		96,444
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2020
Total	97,829		24,888
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2019
Total	16,536		6,822
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2018
Total	4,755		178
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
2017
Total	176		16
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Prior
Total	16		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Total
Total	136,770		128,348
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Payment Activity, Aging Status [Member] | Construction - other | Performing
2021
Total	17,458		96,444
2020
Total	97,829		24,888
2019
Total	16,172		6,822
2018
Total	4,755		0
2017
Total	0		16
Prior
Total	16		0
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	136,230		128,170
Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]
2021
Total	0		0
2020
Total	0		0
2019
Total	364		0
2018
Total	0		178
2017
Total	176		0
Prior
Total	0		0
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	540		178
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member]
Revolving Loans Amortized Cost Basis
Total	321		1,344
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Pass
Revolving Loans Amortized Cost Basis
Total	321		404
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		940
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1)
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Pass
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(1) | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1)
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Pass
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and industrial (1) | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	321		1,344
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass
Revolving Loans Amortized Cost Basis
Total	321		404
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		940
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member]
Revolving Loans Amortized Cost Basis
Total	5,052		5,363
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Performing
Revolving Loans Amortized Cost Basis
Total	4,845		5,363
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	207		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity
Revolving Loans Amortized Cost Basis
Total	5,052		5,321
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Performing
Revolving Loans Amortized Cost Basis
Total	4,845		5,321
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real-estate - home equity | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	207		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Performing
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate - residential mortgage | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer
Revolving Loans Amortized Cost Basis
Total	0		42
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Performing
Revolving Loans Amortized Cost Basis
Total	0		42
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Performing
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Equipment lease financing, other and overdrafts | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other
Revolving Loans Amortized Cost Basis
Total	0		0
Current period gross charge-offs	0		0
Current period recoveries	0		0
Total net (charge-offs) recoveries	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Performing
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]
Revolving Loans Amortized Cost Basis
Total	$ 0		$ 0

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Net Loans	$ 18,990,986	$ 18,900,820
Real-estate - home equity
Financing Receivable, Impaired [Line Items]
Net Loans	1,149,958	1,202,913
Real estate - residential mortgage
Financing Receivable, Impaired [Line Items]
Net Loans	3,254,058	3,141,915
Consumer
Financing Receivable, Impaired [Line Items]
Net Loans	451,857	466,772
Equipment lease financing, other and overdrafts
Financing Receivable, Impaired [Line Items]
Net Loans	$ 233,768	$ 266,082

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Non-accrual loans and leases	$ 143,889	$ 137,198
Loans and leases 90 days or more past due and still accruing	8,559	9,929
Total non-performing loans and leases	152,448	147,127
Other real estate owned (OREO)	3,664	4,178
Total non-performing assets	156,112	151,305
Mortgage Loans in Process of Foreclosure, Amount	$ 7,600	$ 8,100

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses Past Due Loan Status and Non-Accrual Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	$ 8,559	$ 9,929
Non- accrual	143,889	137,198
Current	18,808,411	18,673,373
Net Loans	18,990,986	18,900,820
Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	24,089	59,999
Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	6,038	20,321
Real estate - commercial mortgage
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	2,187	1,177
Non- accrual	51,977	51,470
Current	7,076,861	7,028,173
Net Loans	7,142,137	7,105,092
Real estate - commercial mortgage | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	9,596	14,999
Real estate - commercial mortgage | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,516	9,273
Commercial and industrial (1)
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	219	616
Non- accrual	31,652	31,993
Current	5,640,231	5,625,866
Net Loans	5,675,714	5,670,828
Commercial and industrial (1) | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,718	11,285
Commercial and industrial (1) | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,894	1,068
Real estate - residential mortgage
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	2,750	4,687
Non- accrual	33,401	26,107
Current	3,208,489	3,081,165
Net Loans	3,254,058	3,141,915
Real estate - residential mortgage | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	8,485	22,281
Real estate - residential mortgage | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	933	7,675
Real-estate - home equity
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	3,148	2,753
Non- accrual	9,368	9,588
Current	1,133,585	1,183,296
Net Loans	1,149,958	1,202,913
Real-estate - home equity | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	2,795	5,622
Real-estate - home equity | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,062	1,654
Real-estate - construction
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	0	155
Non- accrual	1,441	1,395
Current	1,081,883	1,043,730
Net Loans	1,083,494	1,047,218
Real-estate - construction | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	170	1,938
Real-estate - construction | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	0	0
Consumer
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	255	417
Non- accrual	301	332
Current	449,586	462,486
Net Loans	451,857	466,772
Consumer | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	1,224	3,036
Consumer | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	491	501
Equipment lease financing, other and overdrafts
Financing Receivable, Past Due [Line Items]
≥ 90 Days Past Due and Accruing	0	124
Non- accrual	15,749	16,313
Current	217,776	248,657
Net Loans	233,768	266,082
Equipment lease financing, other and overdrafts | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	101	838
Equipment lease financing, other and overdrafts | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-accrual	$ 142	$ 150

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	$ 67,049	$ 68,426
Non-accrual TDRs (1)	44,986	35,755
Total TDRs	112,035	104,181
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	27,961	28,451
Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	7,041	6,982
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	18,214	18,602
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	13,674	14,391
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	154	0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Accruing Troubled Debt Restructurings	$ 5	$ 0

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loans	Mar. 31, 2020USD ($)loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	35	17
Post-Modification Recorded Investment | $	$ 13,984	$ 1,703
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	2	1
Post-Modification Recorded Investment | $	$ 4,162	$ 392
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	5	8
Post-Modification Recorded Investment | $	$ 148	$ 577
Real estate - residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	23	7
Post-Modification Recorded Investment | $	$ 7,626	$ 660

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses TDRs by Class Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loans	Mar. 31, 2020USD ($)loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	35	17
Post-Modification Recorded Investment | $	$ 13,984	$ 1,703
Commercial and industrial (1)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	4	1
Post-Modification Recorded Investment | $	$ 1,894	$ 74
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	2	1
Post-Modification Recorded Investment | $	$ 4,162	$ 392
Real estate - residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	23	7
Post-Modification Recorded Investment | $	$ 7,626	$ 660
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	5	8
Post-Modification Recorded Investment | $	$ 148	$ 577
Real-estate - construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	1	0
Post-Modification Recorded Investment | $	$ 154	$ 0

Loans and Allowance for Cred_15

Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans with principal balances approximately in percentage	97.00%		83.00%
Unpaid principal balance, with no related allowance	$ 61,892		$ 68,595
Excluded from TDRs	3,600,000	$ 1,000,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment	1,000		$ 1,000
Impaired loans balances, real estate as collateral	$ 1,000

Mortgage Servicing Rights Summa

Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Servicing Asset [Abstract]
Fair value of MSRs	$ 33,400		$ 28,200
Residential Mortgage
Amortized Cost:
Balance at beginning of period	38,745	$ 39,267
Originations of MSRs	2,811	1,478
Amortization	(3,753)	(1,891)
Balance at end of period	37,803	38,854
Servicing Asset [Abstract]
Beginning balance	10,500	0
Reduction (addition) to valuation allowance	(6,100)	1,100
Ending balance	4,400	1,100
Net MSRs at end of period	$ 33,403	$ 37,754

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Servicing Asset at Amortized Cost [Line Items]
Mortgage Loans Serviced By For Third Parties	$ 4,600,000		$ 4,700,000
Fair value of MSRs	33,400		28,200
Residential Mortgage
Servicing Asset at Amortized Cost [Line Items]
Reduction (addition) to valuation allowance	(6,100)	$ 1,100
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 4,400	$ 1,100	$ 10,500	$ 0

Derivative Financial Instrume_3

Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Foreign currency open position	$ 500
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	3,400
Derivative, Net Liability Position, Aggregate Fair Value	492
Collateral Already Posted, Aggregate Fair Value	143,100
Derivative, Net Liability Position, Termination Value	492
Mortgage Loans Held For Sale [Member]
Derivative [Line Items]
Gain (loss) in fair values of mortgage loans held for sale	$ (2,900)	$ 733

Derivative Financial Instrume_4

Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative asset, fair value	$ 190,003	$ 331,269
Derivative liability, gross liability	(108,839)	(165,210)
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	274,909	382,903
Derivative liability, notional amount	40,007	3,154
Derivative asset, fair value	2,198	8,034
Derivative liability, gross liability	(316)	(35)
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	91,264	0
Derivative liability, notional amount	0	292,262
Derivative asset, fair value	4,650	0
Derivative liability, gross liability	0	(2,263)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	3,169,658	3,834,062
Derivative liability, notional amount	769,300	45,640
Derivative asset, fair value	179,934	330,951
Derivative liability, gross liability	(9,721)	(2)
Interest Rate Swap With Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	769,300	45,640
Derivative liability, notional amount	3,169,658	3,834,062
Derivative asset, fair value	9,721	2
Derivative liability, gross liability	(98,368)	(165,205)
Balance Sheet Hedging Instruments
Derivative [Line Items]
Derivative asset, notional amount	0	0
Derivative liability, notional amount	500,000	0
Derivative asset, fair value	305	0
Derivative liability, gross liability	(492)	0
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	12,196	1,121
Derivative liability, notional amount	552	5,963
Derivative asset, fair value	280	5
Derivative liability, gross liability	(14)	(275)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	2,821	6,372
Derivative liability, notional amount	12,213	1,422
Derivative asset, fair value	43	318
Derivative liability, gross liability	$ (258)	$ (5)

Derivative Financial Instrume_5

Derivative Financial Instruments Summary of Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Derivative [Line Items]
Amount of Gain Reclassified from AOCI into Income	$ 1,707
Interest Rate Swap [Member]
Derivative [Line Items]
Amount of Loss Recognized in OCI on Derivative	(2,065)
Amount of Loss Recognized in OCI Included Component	(2,065)
Amount of Gain or (Loss) Recognized in OCI Excluded Component	0
Interest Rate Swap [Member] | Interest Income
Derivative [Line Items]
Amount of Gain Reclassified from AOCI into Income	144
Amount of Gain Reclassified from AOCI into Income Included Component	144
Amount of Gain or (Loss) Reclassified from AOCI into Income Excluded Component	$ 0

Derivative Financial Instrume_6

Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 700	$ 1,231
Mortgage Banking Derivatives [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	796	1,040
Interest Rate Swap [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	(104)	72
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 8	$ 119

Derivative Financial Instrume_7

Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	$ 34,092		$ 83,886
Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(2,900)	$ 733
Cost [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	33,801		80,662
Fair value [Member] | Mortgage Loans Held For Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	$ 34,092		$ 83,886

Derivative Financial Instrume_8

Derivative Financial Instruments Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivative asset, fair value	$ 190,003	$ 331,269
Derivative, Collateral, Obligation to Return Securities	(11,822)	(7)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	178,181	331,262
Derivative liability, gross liability	108,839	165,210
Derivative liability, Collateral, Right to Reclaim Securities	(11,822)	(7)
Derivative liability, Collateral, Right to Reclaim Cash	(96,802)	(165,203)
Derivative liability, Net Amount	215	0
Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	189,960	330,951
Derivative, Collateral, Obligation to Return Securities	(11,779)	(2)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	178,181	330,949
Derivative liability, gross liability	108,581	165,205
Derivative liability, Collateral, Right to Reclaim Securities	(11,779)	(2)
Derivative liability, Collateral, Right to Reclaim Cash	(96,802)	(165,203)
Derivative liability, Net Amount	0	0
Foreign Exchange Contract [Member]
Offsetting Assets [Line Items]
Derivative asset, fair value	43	318
Derivative, Collateral, Obligation to Return Securities	(43)	(5)
Derivative, Collateral, Obligation to Return Cash	0	0
Net Amount	0	313
Derivative liability, gross liability	258	5
Derivative liability, Collateral, Right to Reclaim Securities	(43)	(5)
Derivative liability, Collateral, Right to Reclaim Cash	0	0
Derivative liability, Net Amount	$ 215	$ 0

Tax Credit Investments (Details

Tax Credit Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Affordable housing tax credit investment, net	$ 145,888		$ 152,203
Other tax credit investments, net	58,782		59,224
Total TCIs, net	204,670		211,427
Unfunded affordable housing tax credit commitments	30,762		31,562
Other tax credit liabilities	49,491		49,491
Total unfunded tax credit commitments and liabilities	80,253		$ 81,053
Affordable housing tax credits and other tax benefits	(6,488)	$ (7,194)
Other tax credit investment credits and tax benefits	(723)	(941)
Amortization of affordable housing investments, net of tax benefit	4,366	5,024
Deferred tax expense	160	208
Total net reduction in income tax expense	(2,685)	(2,903)
Affordable housing tax credits investment	986	1,022
Other tax credit investment amortization	545	428
Total amortization of TCIs	$ 1,531	$ 1,450

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Unrealized gain on securities, before tax amount	$ (51,751)	$ 22,380
Unrealized gain on securities, tax effect	11,753	(4,949)
Unrealized gain on securities, net of tax amount	(39,999)	17,431
Reclassification adjustment for securities gains included in net income, before tax amount	487	(46)
Reclassification adjustment for securities gains included in net income, tax effect	(110)	10
Reclassification adjustment for securities gains included in net income, net of tax amount	377	(36)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Before Tax	2,312	1,022
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Tax	(525)	(227)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To Maturity, After Tax	1,787	795
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount	(2,209)
Net unrealized loss on interest rate swaps used in cash flow hedges, tax	(502)
Net unrealized loss on interest rate swaps used in cash flow hedges, net of tax amount	(1,707)
Amortization of net unrecognized pension and postretirement items, before tax amount	370	328
Amortization of net unrecognized pension and postretirement items, tax effect	(81)	(73)
Amortization of net unrecognized pension and postretirement items, net of tax amount	289	255
Total Other Comprehensive Income, Before Tax Amount	(50,791)	23,684
Total Other Comprehensive Income, Tax Effect	11,538	(5,239)
Other Comprehensive (Loss) Income	$ (39,253)	$ 18,445

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,616,828	$ 2,342,176
Ending Balance	2,629,655	2,285,748
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	81,604	14,864
OCI before reclassifications	(39,999)	17,431
Amounts reclassified from AOCI	377	(36)
Ending Balance	43,769	33,054
Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	0
OCI before reclassifications	0	0
Amounts reclassified from AOCI	(1,707)	0
Ending Balance	(1,707)	0
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(16,513)	(15,001)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	289	255
Ending Balance	(16,224)	(14,746)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	65,091	(137)
OCI before reclassifications	(39,999)	17,431
Amounts reclassified from AOCI	(1,042)	219
Ending Balance	25,838	18,308
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,787	795
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,787	795
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	0	0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	$ 0	$ 0

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,758,597	$ 3,062,143
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	2,758,597
Mortgages Held-for-sale, Fair Value Disclosure	34,092	83,886
Available-for-sale Securities, Fair Value Disclosure		3,062,143
Investments held in Rabbi Trust	25,374	24,383
Derivative assets	197,131	339,310
Assets, Fair Value Disclosure	3,015,194	3,509,722
Liabilities Held-In-Trust, Fair Value Disclosure	25,374	24,383
Derivative Liability	109,169	167,785
Total liabilities	134,543	192,168
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	994,760
Available-for-sale Securities, Fair Value Disclosure		952,613
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	994,760
Available-for-sale Securities, Fair Value Disclosure		952,613
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	359,371
Available-for-sale Securities, Fair Value Disclosure		367,145
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	359,371
Available-for-sale Securities, Fair Value Disclosure		367,145
Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	399,881
Available-for-sale Securities, Fair Value Disclosure		503,766
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	399,881
Available-for-sale Securities, Fair Value Disclosure		503,766
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	255,364
Available-for-sale Securities, Fair Value Disclosure		377,998
Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	255,364
Available-for-sale Securities, Fair Value Disclosure		377,998
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	673,017
Available-for-sale Securities, Fair Value Disclosure		762,415
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	673,017
Available-for-sale Securities, Fair Value Disclosure		762,415
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	76,204
Available-for-sale Securities, Fair Value Disclosure		98,206
Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	76,204
Available-for-sale Securities, Fair Value Disclosure		98,206
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure		0
Investments held in Rabbi Trust	25,374	24,383
Derivative assets	323	323
Assets, Fair Value Disclosure	25,697	24,706
Liabilities Held-In-Trust, Fair Value Disclosure	25,374	24,383
Derivative Liability	272	280
Total liabilities	25,646	24,663
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	2,682,393
Mortgages Held-for-sale, Fair Value Disclosure	34,092	83,886
Available-for-sale Securities, Fair Value Disclosure		2,963,937
Investments held in Rabbi Trust	0	0
Derivative assets	196,808	338,987
Assets, Fair Value Disclosure	2,913,293	3,386,810
Liabilities Held-In-Trust, Fair Value Disclosure	0	0
Derivative Liability	108,897	167,505
Total liabilities	108,897	167,505
Fair Value, Inputs, Level 2 [Member] | Other Corporate Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	4,400
Fair Value, Inputs, Level 2 [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	355,000	362,800
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	994,760
Available-for-sale Securities, Fair Value Disclosure		952,613
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	359,371
Available-for-sale Securities, Fair Value Disclosure		367,145
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	399,881
Available-for-sale Securities, Fair Value Disclosure		503,766
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	255,364
Available-for-sale Securities, Fair Value Disclosure		377,998
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	673,017
Available-for-sale Securities, Fair Value Disclosure		762,415
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	76,204
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Available-for-sale Securities, Fair Value Disclosure		98,206
Investments held in Rabbi Trust	0	0
Derivative assets	0	0
Assets, Fair Value Disclosure	76,204	98,206
Liabilities Held-In-Trust, Fair Value Disclosure	0	0
Derivative Liability	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0
Available-for-sale Securities, Fair Value Disclosure		0
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 76,204
Available-for-sale Securities, Fair Value Disclosure		$ 98,206

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, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 0	$ 2,400
Sales	0
Unrealized adjustment to fair value	0	(242)
(Premium amortization) discount accretion		2
Balance, end of period	0	2,160
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	98,206	101,926
Sales	(24,619)
Unrealized adjustment to fair value	2,617	(8,260)
(Premium amortization) discount accretion		0
Balance, end of period	$ 76,204	$ 93,666

Fair Value Measurements Asset_2

Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 3,664	$ 4,178
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans	122,962	116,584
OREO	3,664	4,178
MSRs (1)	33,403	28,245
Assets, Fair Value Disclosure	$ 160,029	$ 149,007

Fair Value Measurements Details

Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
AFS, at estimated fair value	$ 2,758,597	$ 3,062,143
HTM securities	843,743
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	1,661,876	1,847,832
FRB and FHLB stock	66,209	92,129
Loans held for sale	34,092	83,886
AFS, at estimated fair value	2,758,597	3,062,143
HTM securities	853,413	278,281
Net Loans	18,725,000	18,623,253
Accrued interest receivable	65,649	72,942
Other financial assets	510,534	650,425
Demand and savings deposits	19,250,538	18,279,358
Brokered deposits	309,873	335,185
Time deposits	2,073,427	2,224,665
Short-term borrowings	520,989	630,066
Accrued interest payable	5,618	10,365
Other financial liabilities	297,069	338,747
FHLB advances and long-term debt	626,407	1,296,263
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	1,661,876	1,847,832
FRB and FHLB stock	66,209	92,129
Loans held for sale	34,092	83,886
AFS, at estimated fair value	2,758,597	3,062,143
HTM securities	843,743	296,857
Net Loans	18,354,532	18,354,532
Accrued interest receivable	65,649	72,942
Other financial assets	510,534	650,425
Demand and savings deposits	19,250,538	18,279,358
Brokered deposits	310,874	336,391
Time deposits	2,087,663	2,246,457
Short-term borrowings	520,989	630,066
Accrued interest payable	5,618	10,365
Other financial liabilities	297,069	338,747
FHLB advances and long-term debt	607,577	1,332,041
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	1,661,876	1,847,832
FRB and FHLB stock	0	0
Loans held for sale	0	0
AFS, at estimated fair value	0	0
HTM securities	0	0
Net Loans	0	0
Accrued interest receivable	65,649	72,942
Other financial assets	276,659	279,015
Demand and savings deposits	19,250,538	18,279,358
Brokered deposits	289,873	295,185
Time deposits	0	0
Short-term borrowings	520,989	630,066
Accrued interest payable	5,618	10,365
Other financial liabilities	173,899	156,869
FHLB 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
FRB and FHLB stock	66,209	92,129
Loans held for sale	34,092	83,886
AFS, at estimated fair value	2,682,393	2,963,937
HTM securities	843,743	296,857
Net Loans	0	0
Accrued interest receivable	0	0
Other financial assets	196,808	338,987
Demand and savings deposits	0	0
Brokered deposits	21,001	41,206
Time deposits	2,087,663	2,246,457
Short-term borrowings	0	0
Accrued interest payable	0	0
Other financial liabilities	108,897	167,505
FHLB advances and long-term debt	607,577	1,332,041
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
FRB and FHLB stock	0	0
Loans held for sale	0	0
AFS, at estimated fair value	76,204	98,206
HTM securities	0	0
Net Loans	18,354,532	18,354,532
Accrued interest receivable	0	0
Other financial assets	37,067	32,423
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	14,273	14,373
FHLB advances and long-term debt	$ 0	$ 0

Fair Value Measurements Narrati

Fair Value Measurements Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	$ 2,758,597	$ 3,062,143
Significant input, assumed market return to liquidity (years)	5 years
Other real estate owned (OREO)	$ 3,664	4,178
Visa
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Gain on sale of shares	$ 34,000
Common Class B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment owned, balance (in shares)	133
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average annual constant prepayment rate	15.30%
Weighted average discount rate	9.50%
Fair Value, Recurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	$ 2,758,597
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	2,682,393
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	76,204
Fair Value, Recurring [Member] | Financial Institutions Subordinated Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	355,000	362,800
Fair Value, Recurring [Member] | Other Corporate Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
AFS, at estimated fair value	4,400
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial liabilities	272	280
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned (OREO)	3,664	4,178
Net MSRs at end of period	33,403	28,245
Foreign Exchange Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	323	323
Forward Commitments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	6,800	8,000
Other financial liabilities	316	2,300
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other financial assets	190,000	331,000
Other financial liabilities	$ 108,600	$ 165,200

Net Income Per Share Reconcilia

Net Income Per Share Reconciliation of Weighted Average Common Shares Outstanding (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding (basic) (in shares)	162,441	163,475
Impact of common stock equivalents (in shares)	1,296	942
Weighted average shares outstanding (diluted) (in shares)	163,737	164,417
Basic (in dollars per share)	$ 0.43	$ 0.16
Diluted (in dollars per share)	$ 0.43	$ 0.16

Stock-Based Compensation Compen

Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Compensation expense	$ 1,902	$ 1,619
Tax benefit	(414)	(344)
Stock-based compensation expense, net of tax benefit	$ 1,488	$ 1,275

Stock-Based Compensation Narrat

Stock-Based Compensation Narrative (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021shares
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	176
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	9,300

Employee Benefit Plans Summary

Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 561	$ 681
Expected return on plan assets	(1,011)	(982)
Net amortization and deferral	504	465
Net periodic benefit	54	164
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	8	11
Net accretion and deferral	(134)	(137)
Net periodic benefit	$ (126)	$ (126)

Commitments and Contingencies O

Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 9,018,523	$ 8,651,055
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	295,516	298,750
Commercial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation allowances and reserves, balance	$ 57,917	$ 56,229

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Loss Contingencies [Line Items]
ACL - OBS credit exposure	$ 14,273	$ 14,373
Residential Mortgage
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance	1,100	1,100
ACL - OBS credit exposure	$ 9,700	$ 9,100
Accounting Standards Update 2016-13 | Residential Mortgage
Loss Contingencies [Line Items]
Valuation allowances and reserves, balance			$ (2,100)

Long-Term Borrowings (Details)

Long-Term Borrowings (Details)	3 Months Ended
	Mar. 31, 2021USD ($)
Debt Instrument [Line Items]
Debt extinguishment costs	$ 32,200,000
Payments of FHLBank Borrowings, Financing Activities	536,000,000
Prepayment Fees on Advances, Net	20,900,000
Debt extinguishment costs	841,000
Subordinated Debt | November 2024 Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, repurchase amount	$ 75,000,000
Debt instrument, interest rate (as a percent)	4.50%
Debt instrument, effective rate (as a percent)	4.87%
Debt extinguishment costs	$ 11,300,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, repurchase amount	$ 60,000,000
Debt instrument, interest rate (as a percent)	3.60%
Debt instrument, effective rate (as a percent)	3.95%

Uncategorized Items - fult-2021

Label	Element	Value
Off-Balance Sheet [Member]
Financing Receivable, Allowance for Credit Loss	us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 12,600,000