Independent Bank (INDB) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 04, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Entity Information [Line Items]
Document Transition Report	false
Common Stock, Shares, Outstanding	33,024,882		32,965,692
City Area Code	(781)
Entity Incorporation, State or Country Code	MA
Entity File Number	1-9047
Document Quarterly Report	true
Entity Registrant Name	Independent Bank Corp.
Entity Tax Identification Number	04-2870273
Entity Central Index Key	0000776901
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		33,030,954
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Local Phone Number	878-6100
Entity Address, Address Line One	2036 Washington Street,
Entity Address, City or Town	Hanover,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02339
Entity Shell Company	false
NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]
Entity Information [Line Items]
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	INDB
Common Class A [Member]
Entity Information [Line Items]
Common Stock, Shares, Outstanding	33,024,882		32,965,692	33,260,005	34,377,388
Mailing Address [Member]
Entity Information [Line Items]
Entity Address, Address Line One	288 Union Street,
Entity Address, City or Town	Rockland,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02370

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($)		Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks		$ 126,651,000	$ 169,460,000
Interest-earning deposits with banks		1,642,688,000	1,127,176,000
Securities
Trading		3,269,000	2,838,000
Equity Securities, FV-NI		22,419,000	22,107,000
Debt Securities, Available-for-sale		600,213,000	412,860,000
Held to maturity (fair value $820,430 and $752,177)		805,529,000	724,512,000
Total securities		1,431,430,000	1,162,317,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group		41,632,000	58,104,000
Loans
Total loans		9,246,691,000	9,392,866,000
Less: allowance for credit losses		(107,549,000)	(113,392,000)
Net loans		9,139,142,000	9,279,474,000
Federal Home Loan Bank stock		10,250,000	10,250,000
Bank premises and equipment, net		115,945,000	116,393,000
Goodwill		506,206,000	506,206,000
Other intangible assets		21,689,000	23,107,000
Cash surrender value of life insurance policies		241,365,000	200,525,000
Other assets		496,916,000	551,289,000
Total assets		13,773,914,000	13,204,301,000
Deposits
Noninterest-bearing demand deposits		4,136,259,000	3,762,306,000
Savings and interest checking accounts		4,242,235,000	4,047,332,000
Money market		2,346,985,000	2,232,903,000
Time certificates of deposit of $100,000 and over		465,182,000	525,424,000
Other time certificates of deposits		402,863,000	425,205,000
Total deposits		11,593,524,000	10,993,170,000
Borrowings
Federal Home Loan Bank borrowings		35,717,000	35,740,000
Long-term Debt		28,099,000	32,773,000
Junior Subordinated Notes		62,851,000	62,851,000
Subordinated debentures (less unamortized debt issuance costs of $280 and $304)		49,720,000	49,696,000
Total borrowings		176,387,000	181,060,000
Other liabilities		288,632,000	327,386,000
Total liabilities		12,058,543,000	11,501,616,000
Commitments and contingencies		$ 0	$ 0
Preferred Stock, Shares Authorized		1,000,000	1,000,000
Preferred Stock, Shares Authorized		$ 0.01	$ 0.01
Stockholders' equity
Preferred stock, $0.01 par value, authorized: 1,000,000 shares, outstanding: none		$ 0	$ 0
Common stock, $0.01 par value, authorized: 75,000,000 shares, issued and outstanding: 33,024,882 shares at March 31, 2021 and 32,965,692 shares at December 31, 2020 (includes 144,790 and 135,205 shares of unvested participating restricted stock awards, respectively)		329,000	328,000
Value of shares held in rabbi trust at cost: 83,629 shares at March 31, 2021 and 84,126 shares at December 31, 2020		(3,080,000)	(3,066,000)
Deferred compensation and other retirement benefit obligations		3,080,000	3,066,000
Additional paid in capital		946,002,000	945,638,000
Retained earnings		741,883,000	716,024,000
Accumulated other comprehensive income, net of tax		27,157,000	40,695,000
Total stockholders’ equity		1,715,371,000	1,702,685,000
Total liabilities and stockholders' equity		13,773,914,000	13,204,301,000
Interest-bearing Deposit Liabilities		100,000	100,000
Debt Securities, Held-to-maturity, Fair Value		820,430,000	752,177,000
Debt Securities, Available-for-sale, Amortized Cost		$ 593,167,000	$ 395,453,000
Shares Held in Rabbi Trust at Cost		83,629	84,126
Common Stock, Shares Authorized		75,000,000	75,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		144,790	135,205
Common Stock, Shares, Issued		33,024,882	32,965,692
Common Stock, Shares, Outstanding		33,024,882	32,965,692
Preferred Stock, Shares Outstanding		0	0
Common Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01
Common Class A [Member]
Stockholders' equity
Common Stock, Shares, Outstanding		33,024,882	32,965,692
Long-term Debt [Member]
Stockholders' equity
Unamortized Debt Issuance Expense		$ 26,000	$ 40,000
Subordinated Debt [Member]
Stockholders' equity
Unamortized Debt Issuance Expense		280,000	304,000
Junior Subordinated Debt [Member]
Stockholders' equity
Unamortized Debt Issuance Expense		37,000	37,000
Commercial And Industrial [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		2,086,671,000	2,103,152,000
Total loans		2,086,671,000	2,103,152,000
Commercial Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		4,177,617,000	4,173,927,000
Total loans		4,177,617,000	4,173,927,000
Construction Loans [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		516,362,000	553,929,000
Total loans		516,362,000	553,929,000
Small Business [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		174,211,000	175,023,000
Total loans		174,211,000	175,023,000
Residential Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		1,241,789,000	1,296,183,000
Total loans		1,241,789,000	1,296,183,000
Home Equity Loan [Member]
Loans
Total loans		1,028,495,000
Consumer Portfolio Segment [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		21,546,000	21,862,000
Total loans	[1]	21,546,000	21,862,000
Senior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		610,907,000	633,142,000
Junior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		$ 417,588,000	$ 435,648,000
[1]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Time certificates of deposit least amount	$ 100,000	$ 100,000
Held to Maturity, Fair Value, Total	820,430,000	752,177,000
Debt Securities, Available-for-sale, Amortized Cost	$ 593,167,000	$ 395,453,000
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	75,000,000	75,000,000
Common Stock, Shares, Outstanding	33,024,882	32,965,692
Common Stock, unvested restricted Stock awards	144,790	135,205
Shares Held in Rabbi Trust	83,629	84,126
Common Stock Outstanding
Common Stock, Shares, Outstanding	33,024,882	32,965,692
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 280,000	$ 304,000
Long-term Debt [Member]
Unamortized Debt Issuance Expense	$ 26,000	$ 40,000

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income
Interest and fees on loans	$ 92,383	$ 99,022
Interest Income, Securities, Operating, Taxable	6,627	7,957
Nontaxable interest and dividends on securities	5	9
Interest on loans held for sale	296	232
Interest on federal funds sold and short-term investments	326	160
Total interest and dividend income	99,637	107,380
Interest expense
Interest on deposits	2,711	10,892
Interest on borrowings	1,342	2,184
Total interest expense	4,053	13,076
Net interest income	95,584	94,304
Provision for credit losses	(2,500)	25,000
Net interest income after provision for credit losses	98,084	69,304
Noninterest income
Deposit account fees	3,584	4,970
Interchange and ATM fees	2,720	4,896
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	8,304	6,829
Mortgage banking income	5,740	861
Bank Owned Life Insurance Income	1,323	1,276
Gain Realized on Life Insurance Policies	(258)	(357)
Loan level derivative income	173	3,597
Other noninterest income	3,144	3,649
Total noninterest income	25,246	26,435
Noninterest expenses
Salaries and employee benefits	39,889	37,349
Occupancy and equipment expenses	9,273	9,317
Data processing & facilities management	1,665	1,658
FDIC assessment	1,050
Professional Fees	2,391	1,336
Amortization of Intangible Assets	1,392	1,531
Software Maintenance	1,970	1,685
Available-for-sale Equity Securities, Gross Unrealized Loss	0	1,799
Other noninterest expenses	12,052	12,165
Total noninterest expenses	69,682	66,840
Income before income taxes	53,648	28,899
Current Federal, State and Local, Tax Expense (Benefit)	11,937	2,148
Net income	$ 41,711	$ 26,751
Basic earnings per share (in dollars per share)	$ 1.26	$ 0.78
Diluted earnings per share (in dollars per share)	$ 1.26	$ 0.78
Weighted average common shares (basic) (in shares)	32,995,332	34,184,431
Common shares equivalents (in shares)	30,098	36,827
Weighted average common shares (diluted) (in shares)	33,025,430	34,221,258
Retained Earnings [Member]
Noninterest expenses
Net income	$ 41,711	$ 26,751
Cash dividends declared per common share (in dollars per share)	$ 0.48	$ 0.46

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income		$ 41,711	$ 26,751
Other comprehensive income, net of tax
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax		(7,774)	9,347
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(6,583)	22,984
Net change in other comprehensive income for defined benefit postretirement plans	[1]	819	(772)
Total other comprehensive income (loss)		(13,538)	31,559
Total comprehensive income		$ 28,173	$ 58,310
[1]	The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K.

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation and Other Retirement Benefit Obligations	Additional Paid in Capital	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding				34,377,388
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		$ (1,137,000)
Net income		26,751,000							$ 26,751,000
Other comprehensive income		31,559,000									$ 31,559,000
Cash dividends declared per common share (in dollars per share)									$ 0.46
Common dividend declared		(15,402,000)							$ (15,402,000)
Stock based compensation		850,000						$ 850,000
Restricted stock awards issued, net of awards surrendered				42,531
Restricted stock awards issued, net of awards surrendered		(1,132,000)			$ 1,000			(1,133,000)
Shares issued under direct stock purchase plan				7,009
Shares issued under direct stock purchase plan		560,000			0			560,000
Stock Repurchased During Period, Shares				(1,166,923)
Stock Repurchased During Period, Value		(73,226,000)			(12,000)			(73,214,000)
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits						$ 131,000	$ (131,000)
Increase (Decrease) in Deferred Compensation		0
Period End Balance at Mar. 31, 2020		1,679,656,000			331,000	(4,604,000)	4,604,000	962,513,000	667,084,000		49,728,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method, net of tax.		817,000
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)		(1,000,000)
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal), net of tax.		$ 736,000
Common Stock, Shares, Outstanding				33,260,005
Common Stock, Shares, Outstanding		32,965,692		32,965,692
Cumulative Effect of New Accounting Principle in Period of Adoption (Deprecated 2020-01-31)	[1]		$ 1,553,000							$ 1,553,000
Net income		$ 41,711,000							$ 41,711,000
Other comprehensive income		(13,538,000)									(13,538,000)
Cash dividends declared per common share (in dollars per share)									$ 0.48
Common dividend declared		(15,852,000)							$ (15,852,000)
Proceeds from exercise of stock options, net of cash paid				4,744
Stock Repurchased During Period, Value, as a result of Stock Options Exercised		(57,000)						(57,000)
Stock based compensation		1,150,000						1,150,000
Restricted stock awards issued, net of awards surrendered				48,106
Restricted stock awards issued, net of awards surrendered		(1,220,000)			1,000			(1,221,000)
Shares issued under direct stock purchase plan				6,340
Shares issued under direct stock purchase plan		492,000						492,000
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits						(14,000)	14,000
Increase (Decrease) in Deferred Compensation		0
Period End Balance at Mar. 31, 2021		$ 1,715,371,000			$ 329,000	$ (3,080,000)	$ 3,080,000	$ 946,002,000	$ 741,883,000		$ 27,157,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		33,024,882		33,024,882
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment presented includes $1.1 million ($817,000, net of tax) attributable to the change in accounting methodology for estimating the allowance for credit losses and $1.0 million ($736,000, net of tax) related to the reserve for unfunded commitments resulting from the Company's adoption of the standard. Amount shown in the table above is presented net of tax.

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Shares, Outstanding	33,024,882		32,965,692
Stockholders' Equity Attributable to Parent	$ 1,715,371	$ 1,679,656	$ 1,702,685	$ 1,708,143
Held In Rabbi Trust At Cost [Member]
Stockholders' Equity Attributable to Parent	$ (3,080)	$ (4,604)	(3,066)	(4,735)
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.48	$ 0.46
Stockholders' Equity Attributable to Parent	$ 741,883	$ 667,084	716,024	654,182
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity Attributable to Parent	3,080	4,604	3,066	4,735
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	27,157	49,728	40,695	18,169
Common Stock [Member]
Stockholders' Equity Attributable to Parent	329	331	328	342
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	$ 946,002	$ 962,513	$ 945,638	$ 1,035,450
Common Class A [Member]
Common Stock, Shares, Outstanding	33,024,882	33,260,005	32,965,692	34,377,388

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 41,711	$ 26,751
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	8,228	6,992
Change In Unamortized Net Loan Costs And Premiums	(10,318)	(735)
Provision for credit losses	(2,500)	25,000
Deferred income tax expense	567	3,108
Net unrealized (gain) loss on equity securities	(316)	1,801
Gain (Loss) on Disposition of Property Plant Equipment	4	420
Realized gain on sale leaseback transaction	(145)	(145)
Stock based compensation	1,150	850
Increase in cash surrender value of life insurance policies	(1,323)	(1,276)
Gain Realized on Life Insurance Policies	(258)	(357)
Operating Lease, Payments	(3,077)	(2,926)
Change in Fair Value on Loans Held for Sale	1,764	(255)
Net change in:
Trading assets	(431)	(68)
Loans held for sale	14,708	(10,194)
Other assets	70,901	(151,830)
Increase (Decrease) in Other Operating Liabilities	(53,201)	92,461
Total adjustments	25,753	(37,154)
Net cash provided by (used in) operating activities	67,464	(10,403)
Cash flows used in investing activities
Increase (Decrease) in Equity Securities, FV-NI	(124)	(108)
Proceeds from maturities and principal repayments of securities available for sale	26,092	31,280
Payments to Acquire Debt Securities, Available-for-sale	(223,986)	(30,095)
Proceeds from maturities and principal repayments of securities held to maturity	68,497	48,183
Purchases of securities held to maturity	(149,453)	(84,824)
Net purchases of Federal Home Loan Bank stock	0	(8,850)
Investments in low income housing projects	(6,632)	(5,934)
Purchases of life insurance policies	(40,093)	(93)
Proceeds from Life Insurance Policy	576	1,326
Net (increase) decrease in loans	153,150	(41,283)
Purchases of bank premises and equipment	(2,524)	(1,749)
Proceeds from the sale of bank premises and equipment	4	9
Net cash used in investing activities	(174,493)	(92,138)
Cash flows provided by financing activities
Net decrease in time deposits	(82,569)	(125,396)
Net increase in other deposits	682,938	394,438
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	0	257,826
Increase Decrease in Federal Home Loan Bank Advances Long Term	0	(15,000)
Repayments of Debt	(4,688)
Repayments of long-term debt, net of issuance costs		0
Net Purchases from Stock Options Exercised	(57)
Net proceeds from exercise of stock options		0
Restricted stock awards issued, net of awards surrendered	(1,220)	(1,132)
Proceeds from shares issued under direct stock purchase plan	492	560
Payments for shares repurchased under share repurchase program	0	(73,226)
Common dividends paid	(15,164)	(15,126)
Net cash provided by financing activities	579,732	422,944
Net increase in cash and cash equivalents	472,703	320,403
Cash and cash equivalents at beginning of year	1,296,636	150,974
Cash and cash equivalents at end of period	1,769,339	471,377
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments	24,014	14,394
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 2,223

Investments is Low Income Housi

Investments is Low Income Housing Tax Credits Investments in Low Income Housing Tax Credits	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Low Income Housing Projects [Text Block]	LOW INCOME HOUSING PROJECT INVESTMENTS The Company has invested in low income housing projects that generate Low Income Housing Tax Credits (“LIHTC”) which provide the Company with tax credits and operating loss tax benefits over a period of approximately 15 years. None of the original investment is expected to be repaid. The following table presents certain information related to the Company's investments in low income housing projects as of the dates indicated: March 31 December 31 (Dollars in thousands) Original investment value $ 152,766 $ 128,752 Current recorded investment 117,915 97,435 Unfunded liability obligation 66,968 49,586 Tax credits and benefits 14,202 (1) 9,404 Amortization of investments 12,298 (1) 7,552 Net income tax benefit 1,904 (1) 1,851 (1) Amounts shown represent the full year impact for the year ended December 31, 2021.

Investments is Low Income Hou_2

Investments is Low Income Housing Tax Credits Investments in Low Income Housing Tax Credits - Tables	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Low Income Housing Projects [Table Text Block]	The following table presents certain information related to the Company's investments in low income housing projects as of the dates indicated: March 31 December 31 (Dollars in thousands) Original investment value $ 152,766 $ 128,752 Current recorded investment 117,915 97,435 Unfunded liability obligation 66,968 49,586 Tax credits and benefits 14,202 (1) 9,404 Amortization of investments 12,298 (1) 7,552 Net income tax benefit 1,904 (1) 1,851 (1) Amounts shown represent the full year impact for the year ended December 31, 2021.

Investments is Low Income Hou_3

Investments is Low Income Housing Tax Credits Investments in Qualified Affordable Housing Projects - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021		Dec. 31, 2020
Investments in Affordable Housing Projects [Abstract]
Original investment value	$ 152,766		$ 128,752
Amortization Method Qualified Affordable Housing Project Investments	117,915		97,435
Capital commitment relating to low income housing project investments	66,968		49,586
Tax credits and benefits	14,202	[1]	9,404
Amortization of investments	12,298	[1]	7,552
Net income tax benefit	1,904	[1]	$ 1,851
Interest Receivable	$ 33,400
[1]	(1) Amounts shown represent the full year impact for the year ended December 31, 2021.

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 Independent Bank Corp. (the “Company”) is a state chartered, federally registered bank holding company, incorporated in 1985. The Company is the sole stockholder of Rockland Trust Company (“Rockland Trust” or the “Bank”), a Massachusetts trust company chartered in 1907. All material intercompany balances and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current year’s presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements, primarily consisting of normal recurring adjustments, have been included. 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 or any other interim period.

Recent Accounting Standards

Recent Accounting Standards	3 Months Ended
	Mar. 31, 2021
Recent Accounting Standards [Abstract]
RECENT ACCOUNTING STANDARDS	RECENT ACCOUNTING STANDARDS UPDATES FASB ASC Topic 848 "Reference Rate Reform" Update No. 2020-04. Update No. 2020-04 was issued in March 2020 to provide optional expedients and exceptions for applying GAAP to certain contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in this update apply only to contracts, hedging relationships, and other transactions that reference the London Interbank Offered Rate ("LIBOR") or another reference rate expected to be discontinued because of reference rate reform. The amendments will not apply to contract modifications made and hedging relationship entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. The amendments in this update are effective for all entities as of March 12, 2020 through December 31, 2022 and do not apply to contract modifications made after December 31, 2022. FASB ASC Topic 848 "Reference Rate Reform" Update No. 2021-01 was subsequently issued in January 2021 and expanded application of the optional expedients to derivative transactions affected by the discounting transition. The Company has not yet adopted the amendments in these updates and is currently in the process of reviewing its contracts and existing processes in order to assess the risks and potential impact of the transition away from LIBOR.

Securities

Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Marketable Securities [Table Text Block]	SECURITIES Trading Securities The Company had trading securities of $3.3 million and $2.8 million as of March 31, 2021 and December 31, 2020, respectively. These securities are held in a rabbi trust and will be used for future payments associated with the Company’s non-qualified 401(k) Restoration Plan and Non-qualified Deferred Compensation Plan. Equity Securities The Company had equity securities of $22.4 million and $22.1 million as of March 31, 2021 and December 31, 2020, respectively. These securities consist primarily of mutual funds held in a rabbi trust and will be used for future payments associated with the Company’s supplemental executive retirement plans. The following table represents a summary of the gains and losses recognized within non-interest income and non-interest expense within the consolidated statements of income that relate to equity securities for the periods indicated: Three Months Ended March 31 2021 2020 Dollars in thousands Net gains (losses) recognized during the period on equity securities $ 316 $ (1,801) Less: net gains recognized during the period on equity securities sold during the period 29 6 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 287 $ (1,807) Available for Sale Securities The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) as of the dates indicated: March 31, 2021 December 31, 2020 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Allowance for credit losses Fair (Dollars in thousands) U.S. government agency securities $ 169,091 $ 1,209 $ (2,244) $ — $ 168,056 $ 22,476 $ 1,640 $ — $ — $ 24,116 Agency mortgage-backed securities 286,512 7,561 (3,898) — 290,175 224,293 9,337 (1) — 233,629 Agency collateralized mortgage obligations 78,952 2,688 (11) — 81,629 88,687 3,083 (87) — 91,683 State, county, and municipal securities 540 15 — — 555 790 17 — — 807 Single issuer trust preferred securities issued by banks 489 — (1) — 488 489 — (1) — 488 Pooled trust preferred securities issued by banks and insurers 1,412 — (348) — 1,064 1,429 — (373) — 1,056 Small business administration pooled securities 56,171 2,075 — — 58,246 57,289 3,792 — — 61,081 Total available for sale securities $ 593,167 $ 13,548 $ (6,502) $ — $ 600,213 $ 395,453 $ 17,869 $ (462) $ — $ 412,860 The Company did not record a provision for estimated credit losses on any available for sale securities during the three months ended March 31, 2021 and 2020. Excluded from the table above is accrued interest on available for sale securities of $2.0 million and $1.2 million as of March 31, 2021 and December 31, 2020, respectively, which is included within other assets on the consolidated balance sheets. Additionally, the Company did not record any write-offs of accrued interest income on available for sale securities during the three months ended March 31, 2021 and 2020. Furthermore, no securities held by the Company were delinquent on contractual payments nor were any securities placed on non-accrual status as of March 31, 2021 and December 31, 2020. When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of securities available for sale during the three months ended March 31, 2021 and 2020, and therefore no gains or losses were realized during the periods presented. The following tables show the gross unrealized losses and fair value of the Company’s available for sale securities in an unrealized loss position, and for which the Company has not recorded a provision for credit losses. These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position: March 31, 2021 Less than 12 months 12 months or longer Total # of Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) U.S. government agency securities 4 $ 113,171 $ (2,244) $ — $ — $ 113,171 $ (2,244) Agency mortgage-backed securities 8 98,873 (3,898) — — 98,873 (3,898) Agency collateralized mortgage obligations 1 9,519 (11) — — 9,519 (11) Single issuer trust preferred securities issued by banks and insurers 1 — — 488 (1) 488 (1) Pooled trust preferred securities issued by banks and insurers 1 — — 1,064 (348) 1,064 (348) Total impaired available for sale securities 15 $ 221,563 $ (6,153) $ 1,552 $ (349) $ 223,115 $ (6,502) December 31, 2020 Less than 12 months 12 months or longer Total # of Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) Agency mortgage-backed securities 3 437 (1) — — 437 (1) Agency collateralized mortgage obligations 2 23,323 (87) — — 23,323 (87) Single issuer trust preferred securities issued by banks and insurers 1 488 (1) — — 488 (1) Pooled trust preferred securities issued by banks and insurers 1 — — 1,056 (373) 1,056 (373) Total impaired available for sale securities 7 $ 24,248 $ (89) $ 1,056 $ (373) $ 25,304 $ (462) The Company does not intend to sell these investments and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell each security before the recovery of its amortized cost basis. In addition, management does not believe that any of the securities are impaired due to reasons of credit quality. As a result, the Company did not recognize a provision for credit losses on these investments for the three months ended March 31, 2021 and 2020. The Company made this determination by reviewing various qualitative and quantitative factors regarding each investment category, such as current market conditions, extent and nature of changes in fair value, issuer rating changes and trends, volatility of earnings, and current analysts’ evaluations. As a result of the Company’s review of these qualitative and quantitative factors, the causes of the impairments listed in the table above by category were as follows at March 31, 2021: • U.S. Government Agency Securities, Agency Mortgage-Backed Securities and Agency Collateralized Mortgage Obligations: These portfolios have contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. Government or one of its agencies. • Single Issuer Trust Preferred Securities: This portfolio consists of one security, which is investment grade. The unrealized loss on this security is attributable to the illiquid nature of the trust preferred market in the current economic environment. Management evaluates various financial metrics for the issuer, including regulatory capital ratios of the issuer. • Pooled Trust Preferred Securities: This portfolio consists of one below investment grade security which is performing. The unrealized loss on this security is attributable to the illiquid nature of the trust preferred market in the current economic and regulatory environment. Management evaluates collateral credit and instrument structure, including current and expected deferral and default rates and timing. In addition, discount rates are determined by evaluating comparable spreads observed currently in the market for similar instruments. Held to Maturity Securities The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) as of the dates indicated: March 31, 2021 December 31, 2020 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Allowance for credit losses Fair (Dollars in thousands) U.S. Treasury securities $ 4,014 $ 43 $ — $ — $ 4,057 $ 4,017 $ 60 $ — $ — $ 4,077 Agency mortgage-backed securities 417,811 13,069 (4,252) — 426,628 356,085 18,036 — — 374,121 Agency collateralized mortgage obligations 355,686 7,474 (2,158) — 361,002 335,993 8,466 (340) — 344,119 Single issuer trust preferred securities issued by banks 1,500 8 — — 1,508 1,500 — (2) — 1,498 Small business administration pooled securities 26,518 717 — — 27,235 26,917 1,445 — — 28,362 Total held to maturity securities $ 805,529 $ 21,311 $ (6,410) $ — $ 820,430 $ 724,512 $ 28,007 $ (342) $ — $ 752,177 The Company did not record a provision for estimated credit losses on any held to maturity securities during the three months ended March 31, 2021 and 2020. Excluded from the table above is accrued interest on held to maturity securities of $1.6 million and $1.5 million as of March 31, 2021 and December 31, 2020, respectively, which is included within other assets on the consolidated balance sheets. Additionally, the Company did not record any write-offs of accrued interest income on held to maturity securities during the three months ended March 31, 2021 and 2020. Furthermore, no securities held by the Company were delinquent on contractual payments nor were any securities placed on non-accrual status as of March 31, 2021 and December 31, 2020. When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of held to maturity securities during the three months ended March 31, 2021 and 2020, and therefore no gains or losses were realized during the periods presented. The Company monitors the credit quality of held to maturity securities through the use of credit ratings. Credit ratings are monitored by the Company on at least a quarterly basis. As of March 31, 2021, all held to maturity securities held by the Company were rated investment grade or higher. The actual maturities of certain available for sale or held to maturity securities may differ from the contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. A schedule of the contractual maturities of available for sale and held to maturity securities as of March 31, 2021 is presented below: Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Fair Amortized Fair Amortized Fair Amortized Fair Amortized Fair (Dollars in thousands) Available for sale securities U.S. government agency securities $ 10,001 $ 10,180 $ — $ — $ 159,090 $ 157,876 $ — $ — $ 169,091 $ 168,056 Agency mortgage-backed securities — — 80,169 82,809 98,747 96,914 107,596 110,452 286,512 290,175 Agency collateralized mortgage obligations — — — — — — 78,952 81,629 78,952 81,629 State, county, and municipal securities 350 351 — — 190 204 — — 540 555 Single issuer trust preferred securities issued by banks — — — — — — 489 488 489 488 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,412 1,064 1,412 1,064 Small business administration pooled securities — — — — — — 56,171 58,246 56,171 58,246 Total available for sale securities $ 10,351 $ 10,531 $ 80,169 $ 82,809 $ 258,027 $ 254,994 $ 244,620 $ 251,879 $ 593,167 $ 600,213 Held to maturity securities U.S. Treasury securities $ 4,014 $ 4,057 $ — $ — $ — $ — $ — $ — $ 4,014 $ 4,057 Agency mortgage-backed securities — — 4,614 4,869 128,958 127,901 284,239 293,858 417,811 426,628 Agency collateralized mortgage obligations — — — — — — 355,686 361,002 355,686 361,002 Single issuer trust preferred securities issued by banks — — — — 1,500 1,508 — — 1,500 1,508 Small business administration pooled securities — — — — — — 26,518 27,235 26,518 27,235 Total held to maturity securities $ 4,014 $ 4,057 $ 4,614 $ 4,869 $ 130,458 $ 129,409 $ 666,443 $ 682,095 $ 805,529 $ 820,430 Total $ 14,365 $ 14,588 $ 84,783 $ 87,678 $ 388,485 $ 384,403 $ 911,063 $ 933,974 $ 1,398,696 $ 1,420,643 Included in the table above are $3.3 million of callable securities at March 31, 2021. The carrying value of securities pledged to secure public funds, trust deposits, and for other purposes, as required or permitted by law, was $420.2 million and $419.6 million at March 31, 2021 and December 31, 2020, respectively. At March 31, 2021 and December 31, 2020, the Company had no investments in obligations of individual states, counties, or municipalities which exceeded 10% of consolidated stockholders’ equity.

Loans, Allowance for Credit Los

Loans, Allowance for Credit Losses and Credit Quality (Notes)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans, Allowance for Credit Losses and Credit Quality [Text Block]	LOANS, ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY Loans Held for Investment and Allowance for Credit Losses The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated: Three Months Ended March 31, 2021 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance $ 21,086 $ 45,009 $ 5,397 $ 5,095 $ 14,275 $ 22,060 $ 470 $ 113,392 Charge-offs (3,331) — — (66) — — (289) (3,686) Recoveries 64 57 — 11 1 13 197 343 Provision for credit loss expense 2,388 (718) (129) (1,419) (1,320) (1,357) 55 (2,500) Ending balance (1) $ 20,207 $ 44,348 $ 5,268 $ 3,621 $ 12,956 $ 20,716 $ 433 $ 107,549 Three Months Ended March 31, 2020 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance, pre adoption of ASU 2016-13 $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Cumulative effect accounting adjustment (2) (1,984) (13,048) (3,652) 495 9,828 7,012 212 (1,137) Cumulative effect accounting adjustment (3) 49 337 — — 423 319 29 1,157 Charge-offs — — — (109) — (138) (487) (734) Recoveries 42 — — 3 1 58 246 350 Provision for credit loss expense 5,948 9,274 1,346 1,694 1,155 5,083 500 25,000 Ending balance (1) $ 21,649 $ 29,498 $ 3,747 $ 3,829 $ 14,847 $ 17,910 $ 896 $ 92,376 (1) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $33.4 million and $25.9 million as of March 31, 2021 and March 31, 2020, respectively. (2) Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard. (3) Represents adjustment needed to reflect the day one reclassification of the Company's PCI loan balances to PCD and the associated gross-up, pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.2 million increase to the allowance resulting from the day one reclassification. The balance of allowance for credit losses of $107.5 million as of March 31, 2021 represents a decrease of $5.8 million, or 5.2% compared to December 31, 2020. The decrease in the allowance was driven primarily by $3.3 million of charge-offs and $2.5 million of negative provision. The negative provision reflects improvements in asset quality metrics and overall macro-economic assumptions, as well as an overall reduction in loan balances for the quarter. While management is unable to know with certainty the direct, indirect, and future impacts of the COVID-19 pandemic, it is expected that the pandemic will have a material adverse impact on future losses across a broad range of loan segments. As such, the allowance for credit losses as of March 31, 2021 reflects increased reserve allocations to loan segments that are considered to have elevated loss exposure associated with the COVID-19 pandemic in comparison to March 31, 2020. These loan segments primarily include commercial relationships within industries that are subject to mandated closures and capacity limits that will potentially impede the borrowers’ ability to make loan payments, including loans in the following industry sections: Accommodations, Food Services, Retail Trade, Recreation and Entertainment, and Other Services (excluding Public Administration). In addition to these industry exposures, additional risk of loss was attributable to non-owner occupied real estate borrowers with significant retail tenant exposure, as well as home equity loans within a junior lien position. Leveraging actual historical loss given default (LGD) rates combined with stressing of assumptions over probability of default rates over these higher risk segments, qualitative adjustments were made to the initially model-driven calculated loss reserves. For the purpose of estimating the allowance for credit losses, management segregated the loan portfolio into the portfolio segments detailed in the above tables. Each of these loan categories possesses unique risk characteristics that are considered when determining the appropriate level of allowance for each segment. Some of the characteristics unique to each loan category include: Commercial Portfolio • Commercial and Industrial : Loans in this category consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital and/or capital investment. Collateral generally consists of pledges of business assets including, but not limited to: accounts receivable, inventory, plant and equipment, or real estate, if applicable. Repayment sources consist of primarily, operating cash flow, and secondarily, liquidation of assets. • Commercial Real Estate : Loans in this category consist of mortgage loans to finance investment in real property such as multi-family residential, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties. Loans are typically written with amortizing payment structures. Collateral values are determined based upon third party appraisals and evaluations. Loan to value ratios at origination are governed by established policy and regulatory guidelines. Repayment sources consist of, primarily, cash flow from operating leases and rents and, secondarily, liquidation of assets. • Commercial Construction : Loans in this category consist of short-term construction loans, revolving and nonrevolving credit lines and construction/permanent loans to finance the acquisition, development and construction or rehabilitation of real property. Project types include residential land development, 1-4 family, condominium, and multi-family home construction, commercial/retail, office, industrial, hotels, educational and healthcare facilities and other specific use properties. Loans may be written with nonamortizing or hybrid payment structures depending upon the type of project. Collateral values are determined based upon third party appraisals and evaluations. Loan to value ratios at origination are governed by established policy and regulatory guidelines. Repayment sources vary depending upon the type of project and may consist of sale or lease of units, operating cash flows or liquidation of other assets. • Small Business: Loans in this category consist of revolving, term loan and mortgage obligations extended to sole proprietors and small businesses for purposes of financing working capital and/or capital investment. Collateral generally consists of pledges of business assets including, but not limited to, accounts receivable, inventory, plant and equipment, or real estate if applicable. Repayment sources consist primarily of operating cash flows and, secondarily, liquidation of assets. For the commercial portfolio it is the Company’s policy to obtain personal guarantees for payment from individuals holding material ownership interests in the borrowing entities. Consumer Portfolio • Residential Real Estate : Residential mortgage loans held in the Company’s portfolio are made to borrowers who demonstrate the ability to make scheduled payments with full consideration to underwriting factors such as current and expected income, employment status, current assets, other financial resources, credit history and the value of the collateral. Collateral consists of mortgage liens on 1-4 family residential properties. Residential mortgage loans also include loans to construct owner-occupied 1-4 family residential properties. • Home Equity : Home equity loans and credit lines are made to qualified individuals and are primarily secured by senior or junior mortgage liens on owner-occupied 1-4 family homes, condominiums or vacation homes. Each home equity loan has a fixed rate and is billed in equal payments comprised of principal and interest. The majority of home equity lines of credit have a variable rate and are billed in interest-only payments during the draw period. At the end of the draw period, the home equity line of credit is billed as a percentage of the then outstanding principal balance plus all accrued interest over a predetermined repayment period, as set forth in the note. Additionally, the Company has the option of renewing each line of credit for additional draw periods. Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan to value ratios within established policy guidelines. • Other Consumer: Other consumer loan products include personal lines of credit and amortizing loans made to qualified individuals for various purposes such as education, debt consolidation, personal expenses or overdraft protection. Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines. These loans may be secured or unsecured. Credit Quality The Company continually monitors the asset quality of the loan portfolio using all available information. Based on this information, loans demonstrating certain payment issues or other weaknesses may be categorized as adversely risk-rated, delinquent, nonperforming and/or put on nonaccrual status. Additionally, in the course of resolving such loans, the Company may choose to restructure the contractual terms of certain loans to match the borrower’s ability to repay the loan based on their current financial condition. The Company reviews numerous credit quality indicators when assessing the risk in its loan portfolio. For the commercial portfolio, the Company utilizes a 10-point credit risk-rating system, which assigns a risk-grade to each loan obligation based on a number of quantitative and qualitative factors associated with a commercial or small business loan transaction. Factors considered include industry and market conditions, position within the industry, earnings trends, operating cash flow, asset/liability values, debt capacity, guarantor strength, management and controls, financial reporting, collateral, and other considerations. The risk-rating categories for the commercial portfolio are defined as follows: • Pass: Risk-rating “1” through “6” comprises of loans ranging from ‘Substantially Risk Free’ which indicates borrowers are of unquestioned credit standing and the pinnacle of credit quality, well established companies with a very strong financial condition, and loans fully secured by cash collateral, through ‘Acceptable Risk’, which indicates borrowers may exhibit declining earnings, strained cash flow, increasing or above average leverage and/or weakening market fundamentals that indicate below average asset quality, margins and market share. Collateral coverage is protective. • Potential Weakness: Borrowers exhibit potential credit weaknesses or downward trends deserving management’s close attention. If not checked or corrected, these trends will weaken the Company’s asset and position. While potentially weak, currently these borrowers are marginally acceptable; no loss of principal or interest is envisioned. • Definite Weakness Loss Unlikely: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt. Loans may be inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. Normal repayment from the borrower is in jeopardy, although no loss of principal is envisioned. However, there is a distinct possibility that a partial loss of interest and/or principal will occur if the deficiencies are not corrected. Collateral coverage may be inadequate to cover the principal obligation. • Partial Loss Probable: Borrowers exhibit well defined weaknesses that jeopardize the orderly liquidation of debt with the added provision that the weaknesses make collection of the debt in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Serious problems exist to the point where partial loss of principal is likely. • Definite Loss: Borrowers deemed incapable of repayment. Loans to such borrowers are considered uncollectible and of such little value that continuation as active assets of the Company is not warranted. The Company utilizes a comprehensive, continuous strategy for evaluating and monitoring commercial credit quality. Initially, credit quality is determined at loan origination and is re-evaluated when subsequent actions, such as renewals, modifications or reviews, occur. Actively managed commercial borrowers are required to provide updated financial information at least annually which is carefully evaluated for any changes in credit quality. Larger loan relationships are subject to a full annual credit review by experienced credit professionals, while continuous portfolio monitoring techniques are employed to evaluate changes in credit quality for smaller loan relationships. Any changes in credit quality are reflected in risk-rating changes. Additionally, the Company retains an independent loan review firm to evaluate the credit quality of the commercial loan portfolio. The independent loan review process achieves significant penetration into the commercial loan portfolio and reports the results of these reviews to the Audit Committee of the Board of Directors on a quarterly basis. Commercial loan modifications granted by the Company allowing payment deferrals for qualifying borrowers in accordance with the Coronavirus Aid, Relief and Economic Security Act ("CARES Act") have been assessed for potential downgrades of risk ratings. For the Company’s consumer portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. As a result, for this portfolio the Company utilizes a pass/default risk-rating system, based on an age analysis (i.e., days past due) associated with each consumer loan. Under this structure, consumer loans less than 90 days past due are assigned a "pass" rating, while any consumer loans 90 days or more past due are assigned a "default" rating. Consumer loan modifications granted by the Company allowing payment deferrals for qualifying borrowers in accordance with the CARES Act have not been categorized as delinquent loans. The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of the dates indicated below: March 31, 2021 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass (1) $ 420,682 $ 724,577 $ 127,454 $ 88,970 $ 25,737 $ 27,123 $ 589,448 $ — $ 2,003,991 Potential weakness 3,424 14,991 2,636 2,148 4,288 3,205 12,252 — 42,944 Definite weakness - loss unlikely 17,912 663 1,116 1,327 2,768 482 6,927 — 31,195 Partial loss probable — — — — — 143 8,398 — 8,541 Definite loss — — — — — — — — — Total commercial and industrial $ 442,018 $ 740,231 $ 131,206 $ 92,445 $ 32,793 $ 30,953 $ 617,025 $ — $ 2,086,671 Commercial real estate Pass $ 214,573 $ 1,043,424 $ 687,959 $ 432,728 $ 524,194 $ 966,331 $ 16,196 $ — $ 3,885,405 Potential weakness 390 29,218 53,849 31,274 18,981 86,160 13,612 — 233,484 Definite weakness - loss unlikely 3,590 22,536 3,754 3,474 9,892 15,482 — — 58,728 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 218,553 $ 1,095,178 $ 745,562 $ 467,476 $ 553,067 $ 1,067,973 $ 29,808 $ — $ 4,177,617 Commercial construction Pass $ 28,323 $ 239,954 $ 142,076 $ 28,189 $ 23,313 $ 6,628 $ 19,934 $ — $ 488,417 Potential weakness — 17,544 9,691 — — — 190 — 27,425 Definite weakness - loss unlikely — — — 520 — — — — 520 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 28,323 $ 257,498 $ 151,767 $ 28,709 $ 23,313 $ 6,628 $ 20,124 $ — $ 516,362 Small business Pass $ 10,307 $ 41,418 $ 25,817 $ 17,750 $ 12,624 $ 29,309 $ 33,658 $ — $ 170,883 Potential weakness — — 389 204 10 202 634 — 1,439 Definite weakness - loss unlikely — 677 51 59 17 301 758 — 1,863 Partial loss probable — — — — — — 26 — 26 Definite loss — — — — — — — — — Total small business $ 10,307 $ 42,095 $ 26,257 $ 18,013 $ 12,651 $ 29,812 $ 35,076 $ — $ 174,211 Residential real estate Pass $ 80,657 $ 212,891 $ 126,359 $ 133,150 $ 130,580 $ 554,848 $ — $ — $ 1,238,485 Default — — — 427 — 2,877 — — 3,304 Total residential real estate $ 80,657 $ 212,891 $ 126,359 $ 133,577 $ 130,580 $ 557,725 $ — $ — $ 1,241,789 Home equity Pass $ 23,583 $ 77,497 $ 51,398 $ 46,648 $ 48,132 $ 140,376 $ 636,881 $ 1,762 $ 1,026,277 Default — — — — — 210 2,008 — 2,218 Total home equity $ 23,583 $ 77,497 $ 51,398 $ 46,648 $ 48,132 $ 140,586 $ 638,889 $ 1,762 $ 1,028,495 Other consumer Pass $ 46 $ 540 $ 326 $ 146 $ 620 $ 6,800 $ 12,939 $ — $ 21,417 Default — — — — 15 111 3 — 129 Total other consumer $ 46 $ 540 $ 326 $ 146 $ 635 $ 6,911 $ 12,942 $ — $ 21,546 Total $ 803,487 $ 2,425,930 $ 1,232,875 $ 787,014 $ 801,171 $ 1,840,588 $ 1,353,864 $ 1,762 $ 9,246,691 March 31, 2020 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass (1) $ 119,886 $ 213,925 $ 138,376 $ 50,323 $ 36,685 $ 33,576 $ 736,304 $ 327 $ 1,329,402 Potential weakness 362 5,432 1,489 4,909 725 697 21,780 50 35,444 Definite weakness - loss unlikely 495 2,128 26,006 5,589 2,604 1,575 44,932 — 83,329 Partial loss probable — — — — — 49 — — 49 Definite loss — — — — — — — — — Total commercial and industrial $ 120,743 $ 221,485 $ 165,871 $ 60,821 $ 40,014 $ 35,897 $ 803,016 $ 377 $ 1,448,224 Commercial real estate Pass $ 260,217 $ 943,205 $ 586,125 $ 651,335 $ 468,824 $ 945,248 $ 48,056 $ 2,987 $ 3,905,997 Potential weakness 1,809 8,303 33,755 8,506 9,851 42,382 — — 104,606 Definite weakness - loss unlikely — 3,612 7,432 20,395 6,993 12,312 — — 50,744 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 262,026 $ 955,120 $ 627,312 $ 680,236 $ 485,668 $ 999,942 $ 48,056 $ 2,987 $ 4,061,347 Commercial construction Pass $ 43,369 $ 221,773 $ 114,561 $ 73,493 $ — $ 6,867 $ 44,225 $ 325 $ 504,613 Potential weakness — 554 347 19,044 — — 347 — 20,292 Definite weakness - loss unlikely — — 1,887 — — — 346 — 2,233 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 43,369 $ 222,327 $ 116,795 $ 92,537 $ — $ 6,867 $ 44,918 $ 325 $ 527,138 Small business Pass $ 8,414 $ 31,651 $ 25,184 $ 17,848 $ 17,594 $ 26,734 $ 47,109 $ — $ 174,534 Potential weakness — 12 18 13 753 259 597 — 1,652 Definite weakness - loss unlikely — 47 133 51 169 598 636 — 1,634 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total small business $ 8,414 $ 31,710 $ 25,335 $ 17,912 $ 18,516 $ 27,591 $ 48,342 $ — $ 177,820 Residential real estate Pass $ 39,122 $ 204,524 $ 260,899 $ 210,662 $ 283,255 $ 523,742 $ — $ — $ 1,522,204 Default — — 427 435 — 5,350 — — 6,212 Total residential real estate $ 39,122 $ 204,524 $ 261,326 $ 211,097 $ 283,255 $ 529,092 $ — $ — $ 1,528,416 Home equity Pass $ 23,397 $ 75,161 $ 70,081 $ 67,740 $ 51,106 $ 138,733 $ 715,169 $ 1,853 $ 1,143,240 Default — — — 18 — 579 2,372 61 3,030 Total home equity $ 23,397 $ 75,161 $ 70,081 $ 67,758 $ 51,106 $ 139,312 $ 717,541 $ 1,914 $ 1,146,270 Other consumer Pass $ 414 $ 705 $ 356 $ 1,049 $ 1,000 $ 10,850 $ 12,767 $ — $ 27,141 Default — — — 19 — 39 16 — 74 Total other consumer $ 414 $ 705 $ 356 $ 1,068 $ 1,000 $ 10,889 $ 12,783 $ — $ 27,215 Total $ 497,485 $ 1,711,032 $ 1,267,076 $ 1,131,429 $ 879,559 $ 1,749,590 $ 1,674,656 $ 5,603 $ 8,916,430 (1) Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are included within commercial and industrial under the 2021 and 2020 vintage year and "pass" category as these loans are 100% guaranteed by the U.S. Government. Outstanding PPP loans totaled $846.3 million as of March 31, 2021, including $506.3 million and $340.0 million originated in 2020 and 2021, respectively. For the Company’s consumer portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. However, the Company does supplement performance data with current Fair Isaac Corporation (“FICO”) scores and Loan to Value (“LTV”) estimates. Current FICO data is purchased and appended to all consumer loans on a regular basis. In addition, automated valuation services and broker opinions of value are used to supplement original value data for the residential and home equity portfolios, periodically. The following table shows the weighted average FICO scores and the weighted average combined LTV ratios at the dates indicated below: March 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 56.5 % 57.4 % Home equity portfolio FICO score (re-scored)(1) 772 771 LTV (re-valued)(2)(3) 45.9 % 46.0 % (1) The average FICO scores at March 31, 2021 are based upon rescores from March 2021, as available for previously originated loans, or origination score data for loans booked in March 2021. The average FICO scores at December 31, 2020 were based upon rescores available from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020. (2) The combined LTV ratios for March 31, 2021 are based upon updated automated valuations as of February 2021, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2020 were based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available as of such date. The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained. If no new information is available, the valuation will default to the previously obtained data or most recent appraisal. (3) For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines. Unfunded Commitments Management evaluates the need for a reserve on unfunded lending commitments in a manner consistent with loans held for investment. At March 31, 2021, and December 31, 2020 the Company's estimated reserve for unfunded commitments amounted to $1.0 million and $1.2 million, respectively. Asset Quality The Company’s philosophy toward managing its loan portfolios is predicated upon careful monitoring, which stresses early detection and response to delinquent and default situations. Delinquent loans are managed by a team of collection specialists and the Company seeks to make arrangements to resolve any delinquent or default situation over the shortest possible time frame. As a general rule, loans 90 days or more past due with respect to principal or interest are classified as nonaccrual loans. The Company also may use discretion regarding other loans 90 days or more delinquent if the loan is well secured and/or in process of collection. In response to the COVID-19 pandemic, the Company has granted loan modifications to allow deferral of payments for borrowers negatively impacted by the pandemic. The balance of loans with active deferrals as of March 31, 2021 and December 31, 2020 was $220.6 million and $173.6 million, respectively. The majority of these loans with active deferrals continue to be characterized as current loans. In accordance with regulatory guidance, these modifications are not considered to be troubled debt restructures ("TDRs") if they were performing prior to December 31, 2019. Additionally, a majority of these are characterized as current and therefore are not impacting nonaccrual or delinquency totals as of March 31, 2021 and December 31, 2020. The Company does, however, consider all active deferrals when estimating loss reserves. As loans reach their deferral maturity date, consideration of TDR and delinquency status will resume in accordance with the Company's accounting policy. The following table shows information regarding nonaccrual loans as of the dates indicated: Nonaccrual Balances March 31, 2021 December 31, 2020 With Allowance for Credit Losses Without Allowance for Credit Losses Total With Allowance for Credit Losses Without Allowance for Credit Losses Total (Dollars in thousands) Commercial and industrial $ 3,606 $ 26,179 $ 29,785 $ 3,804 $ 30,925 $ 34,729 Commercial real estate 9,635 — 9,635 10,195 — 10,195 Small business 660 — 660 815 10 825 Residential real estate 8,870 4,522 13,392 10,935 4,593 15,528 Home equity 5,592 — 5,592 5,427 — 5,427 Other consumer 136 — 136 156 — 156 Total nonaccrual loans (1) $ 28,499 $ 30,701 $ 59,200 $ 31,332 $ 35,528 $ 66,860 (1) Included in these amounts were $21.2 million and $22.2 million of nonaccruing TDRs at March 31, 2021 and December 31, 2020, respectively. It is the Company's policy to reverse any accrued interest when a loan is put on nonaccrual status, and, as such, the Company did not record any interest income on nonaccrual loans during the three months ended March 31, 2021 and March 31, 2020. In accordance with government moratorium orders established in response to the COVID-19 pandemic, new foreclosures pursued by the Company were on hold as of March 31, 2021, and in turn, all loan foreclosures in process as of March 31, 2021 had begun prior to the commencement of the moratorium orders. The following table shows information regarding foreclosed residential real estate property at the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ — Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 1,628 $ 1,750 The following tables show the age analysis of past due financing receivables as of the dates indicated: March 31, 2021 30-59 days 60-89 days 90 days or more Total Past Due Total Amortized Cost Number Principal Number Principal Number Principal Number Principal Current (Dollars in thousands) Loan Portfolio Commercial and industrial 6 $ 510 — $ — 10 $ 141 16 $ 651 $ 2,086,020 $ 2,086,671 $ — Commercial real estate 3 888 — — 4 511 7 1,399 4,176,218 4,177,617 — Commercial construction — — — — — — — — 516,362 516,362 — Small business 5 56 1 2 3 36 9 94 174,117 174,211 — Residential real estate 9 1,252 3 764 28 3,837 40 5,853 1,235,936 1,241,789 — Home equity 7 425 2 87 27 2,217 36 2,729 1,025,766 1,028,495 — Other consumer (1) 196 167 1 1 7 130 204 298 21,248 21,546 1 Total 226 $ 3,298 7 $ 854 79 $ 6,872 312 $ 11,024 $ 9,235,667 $ 9,246,691 $ 1 December 31, 2020 30-59 days 60-89 days 90 days or more Total Past Due Total Recorded Number Principal Number Principal Number Principal Number Principal Current (Dollars in thousands) Loan Portfolio Commercial and industrial 2 $ 318 1 $ 672 8 $ 785 11 $ 1,775 $ 2,101,377 $ 2,103,152 $ — Commercial real estate 3 409 — — 4 515 7 924 4,173,003 4,173,927 — Commercial construction — — 2 2,794 — — 2 2,794 551,135 553,929 — Small business 14 421 6 273 4 59 24 753 174,270 175,023 — Residential real estate 12 2,150 8 5,507 27 3,648 47 11,305 1,284,878 1,296,183 — Home equity 10 733 5 203 33 2,633 48 3,569 1,065,221 1,068,790 — Other consumer (1) 260 137 3 1 6 138 269 276 21,586 21,862 1 Total 301 $ 4,168 25 $ 9,450 82 $ 7,778 408 $ 21,396 $ 9,371,470 $ 9,392,866 $ 1 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. Troubled Debt Restructurings In the course of resolving nonperforming loans, the Bank may choose to restructure the contractual terms of certain loans. The Bank attempts to work out an alternative payment schedule with the borrower in order to avoid foreclosure actions. Any loans that are modified are reviewed by the Bank to identify if a TDR has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms, or a combination of the two. The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) TDRs on accrual status $ 20,262 $ 16,983 TDRs on nonaccrual 21,167 22,209 Total TDRs $ 41,429 $ 39,192 Additional commitments to lend to a borrower who has been a party to a TDR $ 466 $ 263 The Company’s policy is to have any restructured loan which is on nonaccrual status prior to being modified remain on nonaccrual status for six months subsequent to being modified before management considers its return to accrual status. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. Additionally, loans classified as TDRs are adjusted to reflect the changes in value of the recorded investment in the loan, if any, resulting from the granting of a concession. For all residential loan modifications, the borrower must perform during a 90 day trial period before the modification is finalized. The following table shows the troubled debt restructurings which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Three Months Ended March 31, 2021 Number of Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 1 $ 14,148 $ 14,148 Commercial real estate (1) 5 3,964 3,964 Small business 1 100 100 Total 7 $ 18,212 $ 18,212 Three Months Ended March 31, 2020 Number of Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 2 $ 268 $ 268 Commercial real estate (1) 1 604 604 Small business 1 49 25 Residential real estate 1 177 209 Total 5 $ 1,098 $ 1,106 (1) The pre-modification and post-modification balances represent the legal principal balance of the loan. During the first quarter of 2021 and 2020 there were two relationships amounting to $14.3 million and $872,000 that related to additional modifications on previously existing TDRs. The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the periods indicated: Three Months Ended March 31 2021 2020 (Dollars in thousands) Adjusted interest rate $ — $ 604 Combination rate and maturity 14,148 — Court ordered concession — 25 Extended maturity 4,064 477 Total $ 18,212 $ 1,106

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
STOCK BASED COMPENSATION	STOCK BASED COMPENSATION During the three months ended March 31, 2021, the Company had the following activity related to stock based compensation: Time Vested Restricted Stock Awards The Company made the following awards of time vested restricted stock: Date Shares Granted Plan Grant Date Fair Value Per Share Vesting Period 2/18/2021 49,550 2005 Employee Stock Plan $ 81.84 Ratably over 5 years from grant date The fair value of the restricted stock awards is based upon the average of the high and low price at which the Company’s common stock traded on the date of grant. The holders of restricted stock awards are entitled to receive dividends and to vote from and as of the date of grant. Performance-Based Restricted Stock Awards On February 18, 2021, the Company granted 18,900 performance-based restricted stock awards to certain executive level employees. These performance-based restricted stock awards were issued from the 2005 Employee Stock Plan and were determined to have a grant date fair value per share of $81.84, determined by the average of the high and low price at which the Company's common stock traded on the date of grant. The number of shares to be vested is contingent upon the Company's attainment of certain performance measures outlined in the award agreement and will be measured as of the end of the three year performance period, January 1, 2021 through December 31, 2023. The awards will vest upon the earlier of the date on which it is determined if the performance goal is achieved subsequent to the performance period or March 31, 2024. These awards are accounted for as equity awards due to the nature of these awards and the fact that these shares will not be settled in cash. The holders of these awards are not entitled to receive dividends or vote until the shares are vested.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Fair Value	DERIVATIVE AND HEDGING ACTIVITIES The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally to manage the Company’s interest rate risk. Additionally, the Company enters into interest rate derivatives, foreign exchange contracts and risk participation agreements to accommodate the business requirements of its customers (“customer related positions”). The Company minimizes the market and liquidity risks of customer related positions by entering into similar offsetting positions with broker-dealers. Derivative instruments are carried at fair value in the Company's financial statements. The accounting for changes in the fair value of a derivative instrument is dependent upon whether or not it qualifies as a hedge for accounting purposes, and further, by the type of hedging relationship. The Company does not enter into proprietary trading positions for any derivatives. The Company is subject to over-the-counter derivative clearing requirements which require certain derivatives to be cleared through central clearing houses. Accordingly, the Company clears certain derivative transactions through the Chicago Mercantile Exchange Clearing House ("CME"). This clearing house requires the Company to post initial and variation margin to mitigate the risk of non-payment, the latter of which is received or paid daily based on the net asset or liability position of the contracts. Interest Rate Positions The Company may utilize various interest rate derivatives as hedging instruments against interest rate risk associated with the Company’s borrowings and loan portfolios. An interest rate derivative is an agreement whereby one party agrees to pay a floating rate of interest on a notional principal amount in exchange for receiving a fixed rate of interest on the same notional amount, for a predetermined period of time, from a second party. The amounts relating to the notional principal amount are not actually exchanged. The following tables reflect the Company's derivative positions as of the dates indicated below for interest rate derivatives which qualify as cash flow hedges for accounting purposes: March 31, 2021 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 0.93 0.19 % 1.53 % $ (1,075) Current Rate Paid Receive Fixed Interest rate swaps on loans 550,000 3.33 0.10 % 2.16 % 21,467 Current Rate Paid Receive Fixed Swap Rate Interest rate collars on loans 400,000 2.41 0.11 % 2.73% - 2.20% 17,942 Total $ 1,025,000 $ 38,334 December 31, 2020 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 1.18 0.22 % 1.53 % $ (1,341) Current Rate Paid Receive Fixed Interest rate swaps on loans 450,000 2.66 0.15 % 2.37 % 27,021 Current Rate Paid Receive Fixed Swap Rate Interest rate collars on loans 400,000 2.66 0.15 % 2.73% - 2.20% 21,764 Total $ 925,000 $ 47,444 The maximum length of time over which the Company is currently hedging its exposure to the variability in future cash flows for forecasted transactions related to the payment of variable interest on existing financial instruments is 8.0 years. For derivative instruments that are designated and qualify as cash flow hedging instruments, the effective portion of the gains or losses is reported as a component of other comprehensive income ("OCI"), and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The Company expects approximately $19.4 million (pre-tax) to be reclassified as an increase to interest income and $844,000 (pre-tax) to be reclassified as an increase to interest expense, from OCI related to the Company’s cash flow hedges in the next twelve months. This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of March 31, 2021. The Company had no fair value hedges as of March 31, 2021 or December 31, 2020. Customer Related Positions Loan level derivatives, primarily interest rate swaps, offered to commercial borrowers through the Company’s loan level derivative program do not qualify as hedges for accounting purposes. The Company believes that its exposure to commercial customer derivatives is limited because these contracts are simultaneously matched at inception with an offsetting dealer transaction. Derivatives with dealer counterparties are then either cleared through a clearinghouse or settled directly with a single counterparty. The commercial customer derivative program allows the Company to retain variable-rate commercial loans while allowing the customer to synthetically fix the loan rate by entering into a variable-to-fixed interest rate swap. The amounts relating to the notional principal amount are not actually exchanged. Foreign exchange contracts offered to commercial borrowers through the Company’s derivative program do not qualify as hedges for accounting purposes. The Company acts as a seller and buyer of foreign exchange contracts to accommodate its customers. To mitigate the market and liquidity risk associated with these derivatives, the Company enters into similar offsetting positions. The amounts relating to the notional principal amount are exchanged. The Company has entered into risk participation agreements with other dealer banks in commercial loan agreements. Participating banks guarantee the performance on borrower-related interest rate swap contracts. These derivatives are not designated as hedges and, therefore, changes in fair value are recognized in earnings. Under a risk participation-out agreement, a derivative asset, the Company participates out a portion of the credit risk associated with the interest rate swap position executed with the commercial borrower for a fee paid to the participating bank. Under a risk participation-in agreement, a derivative liability, the Company assumes, or participates in, a portion of the credit risk associated with the interest rate swap position with the commercial borrower for a fee received from the other bank. The following table reflects the Company’s customer related derivative positions as of the dates indicated below for those derivatives not designated as hedging: Notional Amount Maturing Number of Positions Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value March 31, 2021 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 302 $ 72,391 $ 105,368 $ 137,041 $ 177,153 $ 1,149,151 $ 1,641,104 $ 66,621 Pay fixed, receive variable 302 72,391 105,368 137,041 177,153 1,149,151 1,641,104 (66,615) Foreign exchange contracts Buys foreign currency, sells U.S. currency 30 94,917 6,538 — — — 101,455 2,502 Buys U.S. currency, sells foreign currency 30 94,917 6,538 — — — 101,455 (2,493) Risk participation agreements Participation out 12 6,642 — 2,665 31,804 68,040 109,151 195 Participation in 7 — 30,483 28,866 — 8,436 67,785 (73) Notional Amount Maturing Number of Positions Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value December 31, 2020 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 322 $ 102,999 $ 76,487 $ 149,265 $ 147,422 $ 1,222,557 $ 1,698,730 $ 127,226 Pay fixed, receive variable 313 102,999 76,487 149,265 147,422 1,222,557 1,698,730 (127,216) Foreign exchange contracts Buys foreign currency, sells U.S. currency 33 87,557 5,300 — — — 92,857 (4,214) Buys U.S. currency, sells foreign currency 33 87,557 5,300 — — — 92,857 4,224 Risk participation agreements Participation out 12 6,721 — 2,675 7,307 93,378 110,081 512 Participation in 8 — 30,649 29,072 — 15,844 75,565 (118) (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements. Mortgage Derivatives The Company enters into commitments to fund residential mortgage loans at specified rates and times in the future, with the intention that loans will likely be sold subsequently in the secondary market. Mortgage loan commitments are referred to as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. These commitments are recognized at fair value on the consolidated balance sheet in other assets and other liabilities with changes in their fair values recorded within mortgage banking income. In addition, the Company has elected the fair value option to carry loans held for sale at fair value. The change in fair value of loans held for sale is recorded in current period earnings as a component of mortgage banking income in accordance with the Company's fair value election. The fair value of loans held for sale decreased by $1.8 million and increased by $255,000 for the three month periods ended March 31, 2021 and 2020, respectively. These amounts were offset in earnings by the change in the fair value of mortgage derivatives. Outstanding loan commitments expose the Company to the risk that the price of the loans arising from exercise of the loan commitment might change from inception of the rate lock to funding of the loan due to changes in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increases. To protect against the price risk inherent in derivative loan commitments, the Company utilizes both "mandatory delivery" and "best efforts" forward loan sale commitments to mitigate the risk of potential decreases in the values of loans that would result from the exercise of the derivative loan commitments. Mandatory delivery contracts are accounted for as derivative instruments. Included in the mandatory delivery forward commitments are To Be Announced securities ("TBAs"). Certain assumptions, including pull through rates and rate lock periods, are used in managing the existing and future hedges. The accuracy of underlying assumptions will impact the ultimate effectiveness of any hedging strategies. With mandatory delivery contracts, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If the Company fails to deliver the amount of mortgages necessary to fulfill the commitment by the specified date, it is obligated to pay a "pair-off" fee, based on then-current market prices, to the investor/counterparty to compensate the investor for the shortfall. Generally the Company makes this type of commitment once mortgage loans have been funded and are held for sale, in order to minimize the risk of failure to deliver the requisite volume of loans to the investor and paying pair-off fees as a result. The Company also sells TBA securities to offset potential changes in the fair value of derivative loan commitments. Generally the Company sells TBA securities by entering into derivative loan commitments for settlement in 30 to 90 days. The Company expects that mandatory delivery contracts, including TBA securities, will experience changes in fair value opposite to the changes in the fair value of derivative loan commitments. With best effort contracts, the Company commits to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally best efforts cash contracts have no pair off risk regardless of market movement. The price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g., on the same day the lender commits to lend funds to a potential borrower). The Company expects that these best efforts forward loan sale commitments will experience a net neutral shift in fair value with related derivative loan commitments. The aggregate amount of net realized gains or losses on sales of such loans included within mortgage banking income was $8.1 million and $4.5 million for the three months ended March 31, 2021 and 2020, respectively. Balance Sheet Offsetting The Company does not offset fair value amounts recognized for derivative instruments. The Company does net the amount recognized for the right to reclaim cash collateral against the obligation to return cash collateral arising from derivative instruments executed with the same counterparty under a master netting arrangement. Collateral legally required to be maintained at dealer banks by the Company is monitored and adjusted as necessary. A daily settlement occurs through the CME for changes in the fair value of centrally cleared derivatives. Not all of the derivatives are required to be cleared through the daily clearing agent. As a result, the total fair values of loan level derivative assets and liabilities recognized on the Company's financial statements are not equal and offsetting. The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet and the potential effect of netting arrangements on its financial position, at the dates indicated: Asset Derivatives (1) Liability Derivatives (2) Fair Value at Fair Value at Fair Value at Fair Value at March 31 December 31 March 31 December 31 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives $ 40,776 (3) $ 48,786 (3) $ 2,442 (4) $ 1,342 (4) Derivatives not designated as hedges Customer Related Positions Loan level derivatives 86,890 (3) 127,228 (3) 86,884 (4) 127,218 (4) Foreign exchange contracts 2,691 4,359 2,682 4,349 Risk participation agreements 195 513 73 119 Mortgage Derivatives Interest rate lock commitments 1,652 6,513 — — Forward sale loan commitments 370 — — 1 Forward sale hedge commitments 1,131 — — 1,035 Total derivatives not designated as hedges 92,929 138,613 89,639 132,722 Total 133,705 187,399 92,081 134,064 Netting Adjustments (5) (8,027) 23 7,107 16,105 Net Derivatives on the Balance Sheet 125,678 187,422 84,974 117,959 Financial instruments (6) 50,189 48,786 50,189 48,786 Cash collateral pledged (received) — — 28,799 62,460 Net Derivative Amounts $ 75,489 $ 138,636 $ 5,986 $ 6,713 (1) All asset derivatives are located in other assets on the balance sheet. (2) All liability derivatives are located in other liabilities on the balance sheet. (3) Approximately $1.2 million and $1.7 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2021. Accrued interest receivable of approximately and $1.2 million and $2.0 million is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2020. (4) Approximately $56,000 and $1.7 million of accrued interest payable is included in the fair value of the interest rate and loan level liability derivatives, respectively, as of March 31, 2021. Accrued interest payable of approximately $81,000 and $2.0 million is included in the fair value of the interest rate and loan level derivative liabilities, respectively, as of December 31, 2020. (5) Netting adjustments represent the amounts recorded to convert derivative assets and liabilities cleared through CME from a gross basis to a net basis, inclusive of the variation margin payments, in accordance with applicable accounting guidance. As displayed in the table above, derivatives that cleared through the CME were either in a net asset position or a net liability position as of March 31, 2021. (6) Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet. The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: Three Months Ended March 31 2021 2020 (Dollars in thousands) Derivatives designated as hedges Gain (loss) in OCI on derivatives (effective portion), net of tax $ (6,583) $ 22,984 Gain reclassified from OCI into interest income or interest expense (effective portion) $ 4,380 $ 1,586 Loss reclassified from OCI into noninterest expense (loss on termination) $ — $ — Interest expense $ — $ — Other expense — — Total $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 6 $ 22 Other expense (283) (24) Changes in fair value of mortgage derivatives Mortgage banking income (2,324) (721) Total $ (2,601) $ (723) The Company's derivative agreements with institutional counterparties contain various credit-risk related contingent provisions, such as requiring the Company to maintain a well-capitalized capital position. If the Company fails to meet these conditions, the counterparties could request the Company make immediate payment or demand that the Company provide immediate and ongoing full collateralization on derivative positions in net liability positions. The aggregate fair value of all derivative instruments with credit-risk related contingent features that were in a net liability position was $28.5 million and $79.8 million at March 31, 2021 and December 31, 2020, respectively. Although none of the contingency provisions have applied as of March 31, 2021 and December 31, 2020, the Company has posted collateral to offset the net liability exposure with institutional counterparties. By using derivatives, the Company is exposed to credit risk to the extent that counterparties to the derivative contracts do not perform as required. Should a counterparty fail to perform under the terms of a derivative contract, the Company's credit exposure on interest rate swaps is limited to the net positive fair value and accrued interest of all swaps with each counterparty. The Company seeks to minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. Institutional counterparties must have an investment grade credit rating and be approved by the Company's Board of Directors. As such, management believes the risk of incurring credit losses on derivative contracts with institutional counterparties is remote. The Company's exposure relating to institutional counterparties was $50.9 million and $48.8 million at March 31, 2021 and December 31, 2020, respectively. The Company’s exposure relating to customer counterparties was approximately $76.8 million and $127.2 million at March 31, 2021 and December 31, 2020, respectively. Credit exposure may be reduced by the value of collateral pledged by the counterparty.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Fair value is a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. Therefore, even when market assumptions are not readily available, the assumptions applied by the Company when determining fair value reflect those that the Company determines market participants would use to price the asset or liability at the measurement date. If there has been a significant decrease in the volume and level of activity for the asset or liability, regardless of the valuation technique(s) used, the objective of a fair value measurement remains the same. Fair value is the price that would be received if the asset were to be sold or that would be or paid if the liability were to be transferred in an orderly market transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. When determining fair value, the Company considers pricing information and other inputs that are current as of the measurement date. In periods of market dislocation, the observability of prices and other inputs may be reduced for certain instruments, or not available at all. The unavailability or reduced availability of pricing or other input information could cause an instrument to be reclassified from one level to another. The Fair Value Measurements and Disclosures Topic of the FASB ASC defines fair value and establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under the Fair Value Measurements and Disclosures Topic of the FASB ASC are described below: Level 1 – Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 – Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly. Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation Techniques There have been no changes in the valuation techniques used during the three months ended March 31, 2021. Securities Trading and Equity Securities These equity securities are valued based on market quoted prices. These securities are categorized in Level 1 as they are actively traded and no valuation adjustments have been applied. U.S. Government Agency Securities Fair value is estimated using either multi-dimensional spread tables or benchmarks. The inputs used include benchmark yields, reported trades, and broker/dealer quotes. These securities are classified as Level 2. Agency Mortgage-Backed Securities Fair value is estimated using either a matrix or benchmarks. The inputs used include benchmark yields, reported trades, broker/dealer quotes, and issuer spreads. These securities are categorized as Level 2. Agency Collateralized Mortgage Obligations and Small Business Administration Pooled Securities The valuation model for these securities is volatility-driven and ratings based, and uses multi-dimensional spread tables. The inputs used include benchmark yields, reported trades, new issue data, broker dealer quotes, and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are categorized as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. State, County, and Municipal Securities The fair value is estimated using a valuation matrix with inputs including bond interest rate tables, recent transactions, and yield relationships. These securities are categorized as Level 2. Single and Pooled Issuer Trust Preferred Securities The fair value of trust preferred securities, including pooled and single issuer preferred securities, is estimated using external pricing models, discounted cash flow methodologies or similar techniques. The inputs used in these valuations include benchmark yields, reported trades, new issue data, broker dealer quotes, and collateral performance. If there is at least one significant model assumption or input that is not observable, these securities are classified as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. Loans Held for Sale The Company has elected the fair value option to account for originated closed loans intended for sale. The fair value is measured on an individual loan basis using quoted market prices and when not available, comparable market value or discounted cash flow analysis may be utilized. These assets are typically classified as Level 2. Derivative Instruments Derivatives The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilizes. The Company incorporates credit valuation adjustments to appropriately reflect nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings. Additionally, in conjunction with fair value measurement guidance, the Company has made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Although the Company has determined that the majority of the inputs used to value its interest rate derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its interest rate derivatives and risk participation agreements may also utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of March 31, 2021 and December 31, 2020, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are properly classified as Level 2. Mortgage Derivatives The fair value of mortgage derivatives is determined based on current market prices for similar assets in the secondary market and, therefore, classified as Level 2 within the fair value hierarchy. Individually Assessed Collateral Dependent Loans In accordance with the CECL standard, expected credit losses on individually assessed loans deemed to be collateral dependent are valued based upon the lower of amortized cost or fair value of the underlying collateral less costs to sell. The inputs used in the appraisals of the collateral are not always observable, and in such cases the loans may be classified as Level 3 within the fair value hierarchy; otherwise, they are classified as Level 2. Other Real Estate Owned and Other Foreclosed Assets Other Real Estate Owned ("OREO") and Other Foreclosed Assets are valued at the lower of cost or fair value of the property, less estimated costs to sell. The fair values are generally estimated based upon recent appraisal values of the property less costs to sell the property. Certain inputs used in appraisals are not always observable, and therefore OREO and Other Foreclosed Assets may be classified as Level 3 within the fair value hierarchy. Goodwill and Other Intangible Assets Goodwill and other intangible assets are subject to impairment testing. The Company conducts an annual impairment test of goodwill in the third quarter of each year, or more frequently if necessary. Other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. To estimate the fair value of goodwill and, if necessary, other intangible assets, the Company utilizes both a comparable analysis of relevant price multiples in recent market transactions and a discounted cash flow analysis. Both valuation models require a significant degree of management judgment. In the event the fair value as determined by the valuation model is less than the carrying value, the intangibles may be impaired. If the impairment testing resulted in impairment, the Company would classify the impaired goodwill and other intangible assets subjected to nonrecurring fair value adjustments as Level 3. Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated: Fair Value Measurements at Reporting Date Using Balance Quoted Prices Significant Significant March 31, 2021 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 3,269 $ 3,269 $ — $ — Equity securities 22,419 22,419 — — Securities available for sale U.S. government agency securities 168,056 — 168,056 — Agency mortgage-backed securities 290,175 — 290,175 — Agency collateralized mortgage obligations 81,629 — 81,629 — State, county, and municipal securities 555 — 555 — Single issuer trust preferred securities issued by banks and insurers 488 — 488 — Pooled trust preferred securities issued by banks and insurers 1,064 — 1,064 — Small business administration pooled securities 58,246 — 58,246 — Loans held for sale 41,632 — 41,632 — Derivative instruments 133,705 — 133,705 — Liabilities Derivative instruments 92,081 — 92,081 — Total recurring fair value measurements $ 709,157 $ 25,688 $ 683,469 $ — Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans (1) $ 31,213 $ — $ — $ 31,213 Total nonrecurring fair value measurements $ 31,213 $ — $ — $ 31,213 Fair Value Measurements at Reporting Date Using Balance Quoted Prices Significant Significant December 31, 2020 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,838 $ 2,838 $ — $ — Equity securities 22,107 22,107 — — Securities available for sale U.S. government agency securities 24,116 — 24,116 — Agency mortgage-backed securities 233,629 — 233,629 — Agency collateralized mortgage obligations 91,683 — 91,683 — State, county, and municipal securities 807 — 807 — Single issuer trust preferred securities issued by banks and insurers 488 — 488 — Pooled trust preferred securities issued by banks and insurers 1,056 — 1,056 — Small business administration pooled securities 61,081 — 61,081 — Loans held for sale 58,104 — 58,104 — Derivative instruments 187,399 — 187,399 — Liabilities Derivative instruments 134,064 — 134,064 — Total recurring fair value measurements $ 549,244 $ 24,945 $ 524,299 $ — Nonrecurring fair value measurements: Assets Individually assessed collateral dependent loans (1) $ 31,510 $ — $ — $ 31,510 Total nonrecurring fair value measurements $ 31,510 $ — $ — $ 31,510 (1) The fair value of individually assessed collateral dependent loans is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary. The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated: Fair Value Measurements at Reporting Date Using Carrying Fair Quoted Prices Significant Significant March 31, 2021 (Dollars in thousands) Financial assets Securities held to maturity (a) U.S. Treasury securities $ 4,014 $ 4,057 $ — $ 4,057 $ — Agency mortgage-backed securities 417,811 426,628 — 426,628 — Agency collateralized mortgage obligations 355,686 361,002 — 361,002 — Single issuer trust preferred securities issued by banks 1,500 1,508 — 1,508 — Small business administration pooled securities 26,518 27,235 — 27,235 — Loans, net of allowance for credit losses (b) 9,107,929 9,072,683 — — 9,072,683 Federal Home Loan Bank stock (c) 10,250 10,250 — 10,250 — Cash surrender value of life insurance policies (d) 241,365 241,365 — 241,365 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 10,725,479 $ 10,725,479 $ — $ 10,725,479 $ — Time certificates of deposits (f) 868,045 871,056 — 871,056 — Federal Home Loan Bank borrowings (f) 35,717 35,799 — 35,799 — Long-term borrowings (f) 28,099 27,572 — 27,572 — Junior subordinated debentures (g) 62,851 68,052 — 68,052 — Subordinated debentures (f) 49,720 47,027 — — 47,027 Fair Value Measurements at Reporting Date Using Carrying Fair Quoted Prices Significant Significant December 31, 2020 (Dollars in thousands) Financial assets Securities held to maturity (a) U.S. Treasury securities $ 4,017 $ 4,077 $ — $ 4,077 $ — Agency mortgage-backed securities 356,085 374,121 — 374,121 — Agency collateralized mortgage obligations 335,993 344,119 — 344,119 — Single issuer trust preferred securities issued by banks 1,500 1,498 — 1,498 — Small business administration pooled securities 26,917 28,362 — 28,362 — Loans, net of allowance for credit losses (b) 9,247,964 9,253,381 — — 9,253,381 Federal Home Loan Bank stock (c) 10,250 10,250 — 10,250 — Cash surrender value of life insurance policies (d) 200,525 200,525 — 200,525 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 10,042,541 $ 10,042,541 $ — $ 10,042,541 $ — Time certificates of deposits (f) 950,629 955,598 — 955,598 — Federal Home Loan Bank borrowings (f) 35,740 35,885 — 35,885 — Long-term borrowings (f) 32,773 32,033 — 32,033 — Junior subordinated debentures (g) 62,851 70,238 — 70,238 — Subordinated debentures (f) 49,696 46,486 — — 46,486 (a) The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis. (b) Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis. (c) Federal Home Loan Bank stock has no quoted market value and is carried at cost; therefore the carrying amount approximates fair value. (d) Cash surrender value of life insurance policies is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value. (e) Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date. (f) Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities. (g) Fair value was determined based upon market prices of securities with similar terms and maturities. This summary excludes certain financial assets and liabilities for which the carrying value approximates fair value. For financial assets, these may include cash and due from banks, federal funds sold and short-term investments. For financial liabilities, these may include federal funds purchased. These instruments would all be considered to be classified as Level 1 within the fair value hierarchy. Also excluded from the summary are financial instruments measured at fair value on a recurring and nonrecurring basis, as previously described. The Company considers its current use of financial instruments to be the highest and best use of the instruments.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	3 Months Ended
	Mar. 31, 2021
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE RECOGNITION A portion of the Company's noninterest income is derived from contracts with customers, and as such, the revenue recognized depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company considers the terms of the contract and all relevant facts and circumstances when applying this guidance. To ensure its alignment with this core principle, the Company measures revenue and the timing of recognition by applying the following five steps: 1. Identify the contract(s) with customers 2. Identify the performance obligations 3. Determine the transaction price 4. Allocate the transaction price to the performance obligations 5. Recognize revenue when (or as) the entity satisfies a performance obligation The Company has disaggregated its revenue from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The following table presents the revenue streams that the Company has disaggregated as of the periods indicated: Three Months Ended March 31 March 31 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 3,584 $ 4,970 Interchange fees 1,903 4,104 ATM fees 625 639 Investment management - wealth management and advisory services 7,402 6,289 Investment management - retail investments and insurance revenue 902 540 Merchant processing income 320 393 Credit card income 236 183 Other noninterest income 1,125 1,212 Total noninterest income in-scope of ASC 606 16,097 18,330 Total noninterest income out-of-scope of ASC 606 9,149 8,105 Total noninterest income $ 25,246 $ 26,435 In each of the revenue streams identified above, there were no significant judgments made in determining or allocating the transaction price, as the consideration and service requirements are generally explicitly identified in the associated contracts. Additional information related to each of the revenue streams is further noted below. Deposit Account Fees The Company offers various deposit account products to its customers governed by specific deposit agreements applicable to either personal customers or business customers. These agreements identify the general conditions and obligations of both parties, and include standard information regarding deposit account related fees. Deposit account services include providing access to deposit accounts as well as access to the various deposit transactional services of the Company. These transactional services are primarily those that are identified in the standard fee schedule, and include, but are not limited to, services such as overdraft protection, wire transfer, and check collection. Revenue is recognized in conjunction with the various services being provided. For example, the Company may assess monthly fixed service fees associated with the customer having access to a deposit account, which can vary depending on the account type and daily account balance. In addition, the Company may also assess separate fixed fees associated with and at the time specific transactions are entered into by the customer. As such, the Company considers its performance obligations to be met concurrently with providing the account access or completing the requested deposit transaction. Cash Management Cash management services are a subset of the deposit account fees revenue stream. These services primarily include ACH transaction processing, positive pay and remote deposit services. These services are also governed by separate agreements entered into with the customer. The fee arrangement for these services is structured to assess fees under one of two scenarios, either a per transaction fee arrangement or an earnings credit analysis arrangement. Under the per transaction fee arrangement, fixed fees are assessed concurrently with customers executing the transactions, and as such, the Company considers its performance obligations to be met concurrently with completing the requested transaction. Under the earnings credit analysis arrangement, the Company provides a monthly earnings credit to the customer that is negotiated and determined based on various factors. The credit is then available to absorb the per transaction fees that are assessed on the customer's deposit account activity for the month. Any amount of the transactional fees in excess of the earnings credit is recognized as revenue in that month. Interchange Fees The Company earns interchange revenue from its issuance of credit and debit cards granted through its membership in various card payment networks. The Company provides credit cards and debit cards to its customers which are authorized and settled through these payment networks, and in exchange, the Company earns revenue as determined by each payment network's interchange program. The revenue is recognized concurrently with the settlement of card transactions within each network. ATM Fees The Company deploys automated teller machines (ATMs) as part of its overall branch network. Certain transactions performed at the ATMs require customers to acknowledge and pay a fee for the requested service. Certain ATM fees are disclosed in the deposit account agreement fee schedules, whereas those assessed to non-Rockland Trust deposit holders are solely determined during the transaction at the machine. The ATM fee is a fixed dollar per transaction amount, and as such, is recognized concurrently with the overall daily processing and settlement of the ATM activity. Investment Management - Wealth Management and Advisory Services The Company offers investment management and trust services to individuals, institutions, small businesses and charitable institutions. Each investment management product is governed by its own contract along with a separate identifiable fee schedule unique to that product. The Company also offers additional services, such as estate settlement, financial planning, tax services and other special services quoted at the client's request. The asset management and/or custody fees are based upon a percentage of the monthly valuation of the principal assets in the customer's account, whereas fees for additional or special services are fixed in nature and are charged as services are rendered. As the fees are dependent on assets under management, which are susceptible to market factors outside of the Company's control, this variable consideration is constrained and therefore no revenue is estimated at contract initiation. As such, all revenue is recognized in correlation to the monthly management fee determinations or as transactional services are provided. Due to the fact that payments are primarily made subsequent to the valuation period, the Company records a receivable for revenue earned but not received. The following table provides the amount of investment management revenue earned but not received as of the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Receivables, included in other assets $ 4,826 $ 4,636 Investment Management - Retail Investments and Insurance Revenue The Company offers the sale of mutual fund shares, unit investment trust shares, general securities, fixed and variable annuities and life insurance products through registered representatives who are both employed by the Company and licensed and contracted with various broker general agents to offer these products to the Company’s customer base. As such, the Company performs these services as an agent and earns a fixed commission on the sales of these products and services. To a lesser degree, production bonus commissions can also be earned based upon the Company meeting certain volume thresholds. In general, the Company recognizes commission revenue at the point of sale, and for certain insurance products, may also earn and recognize annual residual commissions commensurate with annual premiums being paid. Merchant Processing Income The Company refers customers to third party merchant processing partners in exchange for commission and fee income. The income earned is comprised of multiple components, including a fixed referral fee per each referred customer, a rebate amount determined primarily as a percentage of net revenue earned by the third party from services provided to each referred customer, and overall production bonus commissions if certain new account production thresholds are met. Merchant processing income is recognized in conjunction with either completing the referral to earn the fixed fee amount or as the merchant activity is processed to derive the Company's rebate and/or production bonus amounts. Credit Card Income The Company provides consumer and business credit card solutions to its customers by soliciting new accounts on behalf of a third party credit card provider in exchange for a fee. The income earned is comprised of new account incentive payments as well as a percentage of interchange income earned by the third party provider offering the consumer and business purpose revolving credit accounts. The credit card income is recognized in conjunction with the establishment of each new credit card member or as the interchange is earned by the third party in connection with net purchase transactions made by the credit card member. Other Noninterest Income The Company earns various types of other noninterest income that fall within the scope of the new revenue recognition rules, and have been aggregated into one general revenue stream in the table noted above. This amount includes, but is not limited to, the following types of revenue with customers: Safe Deposit Rent The Company rents out the use of safe deposit boxes to its customers, which can be accessed when the bank is open for business. The safe deposit box rental fee is paid upfront and is recognized as revenue ratably over the annual term of the contract. 1031 Exchange Fee Revenue The Company provides like-kind exchange services pursuant to Section 1031 of the Internal Revenue Code. Fee income is recognized in conjunction with completing the exchange transactions. Foreign Currency

Comprehensive Income_Loss

Comprehensive Income/Loss	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
COMPREHENSIVE INCOME/LOSS	OTHER COMPREHENSIVE INCOME (LOSS) The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss): Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (10,361) $ 2,587 $ (7,774) Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale (10,361) 2,587 (7,774) Change in fair value of cash flow hedges (4,779) 1,344 (3,435) Less: net cash flow hedge gains reclassified into interest income or interest expense 4,380 (1,232) 3,148 Net change in fair value of cash flow hedges (9,159) 2,576 (6,583) Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period 653 (184) 469 Amortization of net actuarial losses 442 (124) 318 Amortization of net prior service costs 44 (12) 32 Net change in other comprehensive income for defined benefit postretirement plans (1) 1,139 (320) 819 Total other comprehensive loss $ (18,381) $ 4,843 $ (13,538) Three Months Ended Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 12,123 $ (2,776) $ 9,347 Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale 12,123 (2,776) 9,347 Change in fair value of cash flow hedges 33,567 (9,443) 24,124 Less: net cash flow hedge gains reclassified into interest income or interest expense 1,586 (446) 1,140 Net change in fair value of cash flow hedges 31,981 (8,997) 22,984 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (1,389) 391 (998) Amortization of net actuarial losses 245 (69) 176 Amortization of net prior service costs 69 (19) 50 Net change in other comprehensive income for defined benefit postretirement plans (1) (1,075) 303 (772) Total other comprehensive income $ 43,029 $ (11,470) $ 31,559 (1) The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K. Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated: Unrealized Gain (Loss) Unrealized Gain on Cash Flow Hedge Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) 2021 Beginning balance: January 1, 2021 $ 13,255 $ 33,276 $ (5,836) $ 40,695 Net change in other comprehensive income (loss) (7,774) (6,583) 819 (13,538) Ending balance: March 31, 2021 $ 5,481 $ 26,693 $ (5,017) $ 27,157 2020 Beginning balance: January 1, 2020 $ 4,398 $ 16,479 $ (2,708) $ 18,169 Net change in other comprehensive income (loss) 9,347 22,984 (772) 31,559 Ending balance: March 31, 2020 $ 13,745 $ 39,463 $ (3,480) $ 49,728

Commitments and contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	COMMITMENTS AND CONTINGENCIES Financial Instruments with Off-Balance Sheet Risk In the normal course of business, the Company enters into various transactions to meet the financing needs of its customers, which, in accordance with GAAP, are not included in its consolidated balance sheets. These transactions include commitments to extend credit and standby letters of credit, and loan exposures with recourse, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of these commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. The Company has certain loan exposures for which there is recourse. These loan relationships could require the Company to repurchase or cover certain losses per agreements for certain loans that are either sold or referred to third parties. Standby letters of credit are written conditional commitments issued to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment were funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements. The fees collected in connection with the issuance of standby letters of credit are representative of the fair value of the Company's obligation undertaken in issuing the guarantee. In accordance with applicable accounting standards related to guarantees, fees collected in connection with the issuance of standby letters of credit are deferred. The fees are then recognized in income proportionately over the life of the standby letter of credit agreement. The deferred standby letter of credit fees represent the fair value of the Company's potential obligations under the standby letter of credit guarantees. The following table summarizes the above financial instruments at the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Commitments to extend credit $ 3,561,078 $ 3,301,692 Standby letters of credit 20,385 20,686 Deferred standby letter of credit fees 169 164 Loan exposures with recourse 261,713 303,265 Lease Commitments The Company leases office space, space for ATM locations, and certain branch locations under noncancellable operating leases. Se veral of these leases contain renewal options to extend lease terms for a period of 1 to 10 years. During the fourth quarter of 2020, the Company committed to pay lease termination fees of $4.8 million, incurred in connection with two branch closure decisions. It is anticipated that these payments will be made in the second quarter of 2021. There has been no significant change in the future minimum lease payments payable by the Company since December 31, 2020. See the Company's 2020 Form 10-K for information regarding leases and other commitments. Other Contingencies At March 31, 2021, the Bank was involved in pending lawsuits that arose in the ordinary course of business. Management has reviewed these pending lawsuits with legal counsel and has taken into consideration the view of counsel as to their outcome. In the opinion of management, the final disposition of pending lawsuits is not expected to have a material adverse effect on the Company’s financial position or results of operations. Historically, the Bank was required to maintain certain reserve requirements of vault cash and/or deposits with the Federal Reserve Bank of Boston, however the reserve requirement was reduced to zero by the Federal Reserve during the first quarter of 2020 in response to the COVID-19 pandemic, and as such, there was no reserve requirement at March 31, 2021. There was also no reserve requirement balance necessary at December 31, 2020 due to cash balances held at the Federal Reserve that were in excess of reserve requirements.

Subsequent Events (Notes)

Subsequent Events (Notes)	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS On April 22, 2021, the Company announced the signing of a definitive agreement under which the Company will acquire Meridian Bancorp, Inc. ("Meridian") and Rockland Trust Company will merge with East Boston Savings Bank (the "Merger Agreement"). Under the Merger Agreement each share of Meridian common stock will be exchanged for 0.2750 shares of the Company's common stock. The transaction is intended to qualify as a tax-free reorganization for federal income tax purposes and to provide Meridian stockholders with a tax-free exchange for the Company common stock consideration they will receive in the merger. The Company anticipates issuing approximately 14.2 million shares of its common stock in the merger. Based upon the closing price of $79.57 per share of the Company's common stock on April 21, 2021, the transaction is valued at approximately $1.15 billion. The Boards of Directors of each company unanimously approved the transaction, which is subject to certain conditions, including the receipt of required regulatory approvals, approval of both the stockholders of Meridian and the shareholders of the Company, and other customary conditions.

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting Policy	Independent Bank Corp. (the “Company”) is a state chartered, federally registered bank holding company, incorporated in 1985. The Company is the sole stockholder of Rockland Trust Company (“Rockland Trust” or the “Bank”), a Massachusetts trust company chartered in 1907. All material intercompany balances and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current year’s presentation. The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements, primarily consisting of normal recurring adjustments, have been included. 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 or any other interim period.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of Equity securities gains and losses [Table Text Block]	Three Months Ended March 31 2021 2020 Dollars in thousands Net gains (losses) recognized during the period on equity securities $ 316 $ (1,801) Less: net gains recognized during the period on equity securities sold during the period 29 6 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 287 $ (1,807)
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) as of the dates indicated: March 31, 2021 December 31, 2020 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Allowance for credit losses Fair (Dollars in thousands) U.S. government agency securities $ 169,091 $ 1,209 $ (2,244) $ — $ 168,056 $ 22,476 $ 1,640 $ — $ — $ 24,116 Agency mortgage-backed securities 286,512 7,561 (3,898) — 290,175 224,293 9,337 (1) — 233,629 Agency collateralized mortgage obligations 78,952 2,688 (11) — 81,629 88,687 3,083 (87) — 91,683 State, county, and municipal securities 540 15 — — 555 790 17 — — 807 Single issuer trust preferred securities issued by banks 489 — (1) — 488 489 — (1) — 488 Pooled trust preferred securities issued by banks and insurers 1,412 — (348) — 1,064 1,429 — (373) — 1,056 Small business administration pooled securities 56,171 2,075 — — 58,246 57,289 3,792 — — 61,081 Total available for sale securities $ 593,167 $ 13,548 $ (6,502) $ — $ 600,213 $ 395,453 $ 17,869 $ (462) $ — $ 412,860
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]	These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position: March 31, 2021 Less than 12 months 12 months or longer Total # of Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) U.S. government agency securities 4 $ 113,171 $ (2,244) $ — $ — $ 113,171 $ (2,244) Agency mortgage-backed securities 8 98,873 (3,898) — — 98,873 (3,898) Agency collateralized mortgage obligations 1 9,519 (11) — — 9,519 (11) Single issuer trust preferred securities issued by banks and insurers 1 — — 488 (1) 488 (1) Pooled trust preferred securities issued by banks and insurers 1 — — 1,064 (348) 1,064 (348) Total impaired available for sale securities 15 $ 221,563 $ (6,153) $ 1,552 $ (349) $ 223,115 $ (6,502) December 31, 2020 Less than 12 months 12 months or longer Total # of Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) Agency mortgage-backed securities 3 437 (1) — — 437 (1) Agency collateralized mortgage obligations 2 23,323 (87) — — 23,323 (87) Single issuer trust preferred securities issued by banks and insurers 1 488 (1) — — 488 (1) Pooled trust preferred securities issued by banks and insurers 1 — — 1,056 (373) 1,056 (373) Total impaired available for sale securities 7 $ 24,248 $ (89) $ 1,056 $ (373) $ 25,304 $ (462)
Debt Securities, Held-to-maturity [Table Text Block]	The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) as of the dates indicated: March 31, 2021 December 31, 2020 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Allowance for credit losses Fair (Dollars in thousands) U.S. Treasury securities $ 4,014 $ 43 $ — $ — $ 4,057 $ 4,017 $ 60 $ — $ — $ 4,077 Agency mortgage-backed securities 417,811 13,069 (4,252) — 426,628 356,085 18,036 — — 374,121 Agency collateralized mortgage obligations 355,686 7,474 (2,158) — 361,002 335,993 8,466 (340) — 344,119 Single issuer trust preferred securities issued by banks 1,500 8 — — 1,508 1,500 — (2) — 1,498 Small business administration pooled securities 26,518 717 — — 27,235 26,917 1,445 — — 28,362 Total held to maturity securities $ 805,529 $ 21,311 $ (6,410) $ — $ 820,430 $ 724,512 $ 28,007 $ (342) $ — $ 752,177
Schedule of contractual maturities of securities [Table Text Block]	A schedule of the contractual maturities of available for sale and held to maturity securities as of March 31, 2021 is presented below: Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Fair Amortized Fair Amortized Fair Amortized Fair Amortized Fair (Dollars in thousands) Available for sale securities U.S. government agency securities $ 10,001 $ 10,180 $ — $ — $ 159,090 $ 157,876 $ — $ — $ 169,091 $ 168,056 Agency mortgage-backed securities — — 80,169 82,809 98,747 96,914 107,596 110,452 286,512 290,175 Agency collateralized mortgage obligations — — — — — — 78,952 81,629 78,952 81,629 State, county, and municipal securities 350 351 — — 190 204 — — 540 555 Single issuer trust preferred securities issued by banks — — — — — — 489 488 489 488 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,412 1,064 1,412 1,064 Small business administration pooled securities — — — — — — 56,171 58,246 56,171 58,246 Total available for sale securities $ 10,351 $ 10,531 $ 80,169 $ 82,809 $ 258,027 $ 254,994 $ 244,620 $ 251,879 $ 593,167 $ 600,213 Held to maturity securities U.S. Treasury securities $ 4,014 $ 4,057 $ — $ — $ — $ — $ — $ — $ 4,014 $ 4,057 Agency mortgage-backed securities — — 4,614 4,869 128,958 127,901 284,239 293,858 417,811 426,628 Agency collateralized mortgage obligations — — — — — — 355,686 361,002 355,686 361,002 Single issuer trust preferred securities issued by banks — — — — 1,500 1,508 — — 1,500 1,508 Small business administration pooled securities — — — — — — 26,518 27,235 26,518 27,235 Total held to maturity securities $ 4,014 $ 4,057 $ 4,614 $ 4,869 $ 130,458 $ 129,409 $ 666,443 $ 682,095 $ 805,529 $ 820,430 Total $ 14,365 $ 14,588 $ 84,783 $ 87,678 $ 388,485 $ 384,403 $ 911,063 $ 933,974 $ 1,398,696 $ 1,420,643

Loans, Allowance for Credit L_2

Loans, Allowance for Credit Losses and Credit Quality (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Financing Receivable, Allowance for Credit Loss [Table Text Block]	The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated: Three Months Ended March 31, 2021 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance $ 21,086 $ 45,009 $ 5,397 $ 5,095 $ 14,275 $ 22,060 $ 470 $ 113,392 Charge-offs (3,331) — — (66) — — (289) (3,686) Recoveries 64 57 — 11 1 13 197 343 Provision for credit loss expense 2,388 (718) (129) (1,419) (1,320) (1,357) 55 (2,500) Ending balance (1) $ 20,207 $ 44,348 $ 5,268 $ 3,621 $ 12,956 $ 20,716 $ 433 $ 107,549 Three Months Ended March 31, 2020 (Dollars in thousands) Commercial and Commercial Commercial Small Residential Other Consumer Total Allowance for credit losses Beginning balance, pre adoption of ASU 2016-13 $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Cumulative effect accounting adjustment (2) (1,984) (13,048) (3,652) 495 9,828 7,012 212 (1,137) Cumulative effect accounting adjustment (3) 49 337 — — 423 319 29 1,157 Charge-offs — — — (109) — (138) (487) (734) Recoveries 42 — — 3 1 58 246 350 Provision for credit loss expense 5,948 9,274 1,346 1,694 1,155 5,083 500 25,000 Ending balance (1) $ 21,649 $ 29,498 $ 3,747 $ 3,829 $ 14,847 $ 17,910 $ 896 $ 92,376 (1) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $33.4 million and $25.9 million as of March 31, 2021 and March 31, 2020, respectively. (2) Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard.
Financing Receivable Credit Quality Indicators [Table Text Block]	The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of the dates indicated below: March 31, 2021 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass (1) $ 420,682 $ 724,577 $ 127,454 $ 88,970 $ 25,737 $ 27,123 $ 589,448 $ — $ 2,003,991 Potential weakness 3,424 14,991 2,636 2,148 4,288 3,205 12,252 — 42,944 Definite weakness - loss unlikely 17,912 663 1,116 1,327 2,768 482 6,927 — 31,195 Partial loss probable — — — — — 143 8,398 — 8,541 Definite loss — — — — — — — — — Total commercial and industrial $ 442,018 $ 740,231 $ 131,206 $ 92,445 $ 32,793 $ 30,953 $ 617,025 $ — $ 2,086,671 Commercial real estate Pass $ 214,573 $ 1,043,424 $ 687,959 $ 432,728 $ 524,194 $ 966,331 $ 16,196 $ — $ 3,885,405 Potential weakness 390 29,218 53,849 31,274 18,981 86,160 13,612 — 233,484 Definite weakness - loss unlikely 3,590 22,536 3,754 3,474 9,892 15,482 — — 58,728 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 218,553 $ 1,095,178 $ 745,562 $ 467,476 $ 553,067 $ 1,067,973 $ 29,808 $ — $ 4,177,617 Commercial construction Pass $ 28,323 $ 239,954 $ 142,076 $ 28,189 $ 23,313 $ 6,628 $ 19,934 $ — $ 488,417 Potential weakness — 17,544 9,691 — — — 190 — 27,425 Definite weakness - loss unlikely — — — 520 — — — — 520 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 28,323 $ 257,498 $ 151,767 $ 28,709 $ 23,313 $ 6,628 $ 20,124 $ — $ 516,362 Small business Pass $ 10,307 $ 41,418 $ 25,817 $ 17,750 $ 12,624 $ 29,309 $ 33,658 $ — $ 170,883 Potential weakness — — 389 204 10 202 634 — 1,439 Definite weakness - loss unlikely — 677 51 59 17 301 758 — 1,863 Partial loss probable — — — — — — 26 — 26 Definite loss — — — — — — — — — Total small business $ 10,307 $ 42,095 $ 26,257 $ 18,013 $ 12,651 $ 29,812 $ 35,076 $ — $ 174,211 Residential real estate Pass $ 80,657 $ 212,891 $ 126,359 $ 133,150 $ 130,580 $ 554,848 $ — $ — $ 1,238,485 Default — — — 427 — 2,877 — — 3,304 Total residential real estate $ 80,657 $ 212,891 $ 126,359 $ 133,577 $ 130,580 $ 557,725 $ — $ — $ 1,241,789 Home equity Pass $ 23,583 $ 77,497 $ 51,398 $ 46,648 $ 48,132 $ 140,376 $ 636,881 $ 1,762 $ 1,026,277 Default — — — — — 210 2,008 — 2,218 Total home equity $ 23,583 $ 77,497 $ 51,398 $ 46,648 $ 48,132 $ 140,586 $ 638,889 $ 1,762 $ 1,028,495 Other consumer Pass $ 46 $ 540 $ 326 $ 146 $ 620 $ 6,800 $ 12,939 $ — $ 21,417 Default — — — — 15 111 3 — 129 Total other consumer $ 46 $ 540 $ 326 $ 146 $ 635 $ 6,911 $ 12,942 $ — $ 21,546 Total $ 803,487 $ 2,425,930 $ 1,232,875 $ 787,014 $ 801,171 $ 1,840,588 $ 1,353,864 $ 1,762 $ 9,246,691 March 31, 2020 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass (1) $ 119,886 $ 213,925 $ 138,376 $ 50,323 $ 36,685 $ 33,576 $ 736,304 $ 327 $ 1,329,402 Potential weakness 362 5,432 1,489 4,909 725 697 21,780 50 35,444 Definite weakness - loss unlikely 495 2,128 26,006 5,589 2,604 1,575 44,932 — 83,329 Partial loss probable — — — — — 49 — — 49 Definite loss — — — — — — — — — Total commercial and industrial $ 120,743 $ 221,485 $ 165,871 $ 60,821 $ 40,014 $ 35,897 $ 803,016 $ 377 $ 1,448,224 Commercial real estate Pass $ 260,217 $ 943,205 $ 586,125 $ 651,335 $ 468,824 $ 945,248 $ 48,056 $ 2,987 $ 3,905,997 Potential weakness 1,809 8,303 33,755 8,506 9,851 42,382 — — 104,606 Definite weakness - loss unlikely — 3,612 7,432 20,395 6,993 12,312 — — 50,744 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 262,026 $ 955,120 $ 627,312 $ 680,236 $ 485,668 $ 999,942 $ 48,056 $ 2,987 $ 4,061,347 Commercial construction Pass $ 43,369 $ 221,773 $ 114,561 $ 73,493 $ — $ 6,867 $ 44,225 $ 325 $ 504,613 Potential weakness — 554 347 19,044 — — 347 — 20,292 Definite weakness - loss unlikely — — 1,887 — — — 346 — 2,233 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 43,369 $ 222,327 $ 116,795 $ 92,537 $ — $ 6,867 $ 44,918 $ 325 $ 527,138 Small business Pass $ 8,414 $ 31,651 $ 25,184 $ 17,848 $ 17,594 $ 26,734 $ 47,109 $ — $ 174,534 Potential weakness — 12 18 13 753 259 597 — 1,652 Definite weakness - loss unlikely — 47 133 51 169 598 636 — 1,634 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total small business $ 8,414 $ 31,710 $ 25,335 $ 17,912 $ 18,516 $ 27,591 $ 48,342 $ — $ 177,820 Residential real estate Pass $ 39,122 $ 204,524 $ 260,899 $ 210,662 $ 283,255 $ 523,742 $ — $ — $ 1,522,204 Default — — 427 435 — 5,350 — — 6,212 Total residential real estate $ 39,122 $ 204,524 $ 261,326 $ 211,097 $ 283,255 $ 529,092 $ — $ — $ 1,528,416 Home equity Pass $ 23,397 $ 75,161 $ 70,081 $ 67,740 $ 51,106 $ 138,733 $ 715,169 $ 1,853 $ 1,143,240 Default — — — 18 — 579 2,372 61 3,030 Total home equity $ 23,397 $ 75,161 $ 70,081 $ 67,758 $ 51,106 $ 139,312 $ 717,541 $ 1,914 $ 1,146,270 Other consumer Pass $ 414 $ 705 $ 356 $ 1,049 $ 1,000 $ 10,850 $ 12,767 $ — $ 27,141 Default — — — 19 — 39 16 — 74 Total other consumer $ 414 $ 705 $ 356 $ 1,068 $ 1,000 $ 10,889 $ 12,783 $ — $ 27,215 Total $ 497,485 $ 1,711,032 $ 1,267,076 $ 1,131,429 $ 879,559 $ 1,749,590 $ 1,674,656 $ 5,603 $ 8,916,430 (1) Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are included within commercial and industrial under the 2021 and 2020 vintage year and "pass" category as these loans are 100% guaranteed by the U.S. Government. Outstanding PPP loans totaled $846.3 million as of March 31, 2021, including $506.3 million and $340.0 million originated in 2020 and 2021, respectively.
Foreclosed Residential Real Estate Property [Table Text Block]	The following table shows information regarding foreclosed residential real estate property at the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Foreclosed residential real estate property held by the creditor $ — $ — Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 1,628 $ 1,750
Financing Receivable Credit Quality Indicators For Consumer And Residential Portfolio Table Text Block	The following table shows the weighted average FICO scores and the weighted average combined LTV ratios at the dates indicated below: March 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 56.5 % 57.4 % Home equity portfolio FICO score (re-scored)(1) 772 771 LTV (re-valued)(2)(3) 45.9 % 46.0 % (1) The average FICO scores at March 31, 2021 are based upon rescores from March 2021, as available for previously originated loans, or origination score data for loans booked in March 2021. The average FICO scores at December 31, 2020 were based upon rescores available from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020. (2) The combined LTV ratios for March 31, 2021 are based upon updated automated valuations as of February 2021, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2020 were based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available as of such date. The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained. If no new information is available, the valuation will default to the previously obtained data or most recent appraisal. (3) For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.
Financing Receivable, Past Due [Table Text Block]	The following tables show the age analysis of past due financing receivables as of the dates indicated: March 31, 2021 30-59 days 60-89 days 90 days or more Total Past Due Total Amortized Cost Number Principal Number Principal Number Principal Number Principal Current (Dollars in thousands) Loan Portfolio Commercial and industrial 6 $ 510 — $ — 10 $ 141 16 $ 651 $ 2,086,020 $ 2,086,671 $ — Commercial real estate 3 888 — — 4 511 7 1,399 4,176,218 4,177,617 — Commercial construction — — — — — — — — 516,362 516,362 — Small business 5 56 1 2 3 36 9 94 174,117 174,211 — Residential real estate 9 1,252 3 764 28 3,837 40 5,853 1,235,936 1,241,789 — Home equity 7 425 2 87 27 2,217 36 2,729 1,025,766 1,028,495 — Other consumer (1) 196 167 1 1 7 130 204 298 21,248 21,546 1 Total 226 $ 3,298 7 $ 854 79 $ 6,872 312 $ 11,024 $ 9,235,667 $ 9,246,691 $ 1 December 31, 2020 30-59 days 60-89 days 90 days or more Total Past Due Total Recorded Number Principal Number Principal Number Principal Number Principal Current (Dollars in thousands) Loan Portfolio Commercial and industrial 2 $ 318 1 $ 672 8 $ 785 11 $ 1,775 $ 2,101,377 $ 2,103,152 $ — Commercial real estate 3 409 — — 4 515 7 924 4,173,003 4,173,927 — Commercial construction — — 2 2,794 — — 2 2,794 551,135 553,929 — Small business 14 421 6 273 4 59 24 753 174,270 175,023 — Residential real estate 12 2,150 8 5,507 27 3,648 47 11,305 1,284,878 1,296,183 — Home equity 10 733 5 203 33 2,633 48 3,569 1,065,221 1,068,790 — Other consumer (1) 260 137 3 1 6 138 269 276 21,586 21,862 1 Total 301 $ 4,168 25 $ 9,450 82 $ 7,778 408 $ 21,396 $ 9,371,470 $ 9,392,866 $ 1
Financing Receivable, Nonaccrual [Table Text Block]	The following table shows information regarding nonaccrual loans as of the dates indicated: Nonaccrual Balances March 31, 2021 December 31, 2020 With Allowance for Credit Losses Without Allowance for Credit Losses Total With Allowance for Credit Losses Without Allowance for Credit Losses Total (Dollars in thousands) Commercial and industrial $ 3,606 $ 26,179 $ 29,785 $ 3,804 $ 30,925 $ 34,729 Commercial real estate 9,635 — 9,635 10,195 — 10,195 Small business 660 — 660 815 10 825 Residential real estate 8,870 4,522 13,392 10,935 4,593 15,528 Home equity 5,592 — 5,592 5,427 — 5,427 Other consumer 136 — 136 156 — 156 Total nonaccrual loans (1) $ 28,499 $ 30,701 $ 59,200 $ 31,332 $ 35,528 $ 66,860 (1) Included in these amounts were $21.2 million and $22.2 million of nonaccruing TDRs at March 31, 2021 and December 31, 2020, respectively.
Financing Receivable, Troubled Debt Restructuring [Table Text Block]	The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) TDRs on accrual status $ 20,262 $ 16,983 TDRs on nonaccrual 21,167 22,209 Total TDRs $ 41,429 $ 39,192 Additional commitments to lend to a borrower who has been a party to a TDR $ 466 $ 263
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block]	The following table shows the troubled debt restructurings which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Three Months Ended March 31, 2021 Number of Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 1 $ 14,148 $ 14,148 Commercial real estate (1) 5 3,964 3,964 Small business 1 100 100 Total 7 $ 18,212 $ 18,212 Three Months Ended March 31, 2020 Number of Pre-Modification Post-Modification (Dollars in thousands) Troubled debt restructurings Commercial and industrial (1) 2 $ 268 $ 268 Commercial real estate (1) 1 604 604 Small business 1 49 25 Residential real estate 1 177 209 Total 5 $ 1,098 $ 1,106 (1) The pre-modification and post-modification balances represent the legal principal balance of the loan. During the first quarter of 2021 and 2020 there were two relationships amounting to $14.3 million and $872,000 that related to additional modifications on previously existing TDRs.
Troubled Debt Restructurings On Financing Receivables Post Modifications Table Text Block	The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the periods indicated: Three Months Ended March 31 2021 2020 (Dollars in thousands) Adjusted interest rate $ — $ 604 Combination rate and maturity 14,148 — Court ordered concession — 25 Extended maturity 4,064 477 Total $ 18,212 $ 1,106

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	The Company made the following awards of time vested restricted stock: Date Shares Granted Plan Grant Date Fair Value Per Share Vesting Period 2/18/2021 49,550 2005 Employee Stock Plan $ 81.84 Ratably over 5 years from grant date

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes	The following tables reflect the Company's derivative positions as of the dates indicated below for interest rate derivatives which qualify as cash flow hedges for accounting purposes: March 31, 2021 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 0.93 0.19 % 1.53 % $ (1,075) Current Rate Paid Receive Fixed Interest rate swaps on loans 550,000 3.33 0.10 % 2.16 % 21,467 Current Rate Paid Receive Fixed Swap Rate Interest rate collars on loans 400,000 2.41 0.11 % 2.73% - 2.20% 17,942 Total $ 1,025,000 $ 38,334 December 31, 2020 Weighted Average Rate Notional Amount Average Maturity Current Pay Fixed Fair Value (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 1.18 0.22 % 1.53 % $ (1,341) Current Rate Paid Receive Fixed Interest rate swaps on loans 450,000 2.66 0.15 % 2.37 % 27,021 Current Rate Paid Receive Fixed Swap Rate Interest rate collars on loans 400,000 2.66 0.15 % 2.73% - 2.20% 21,764 Total $ 925,000 $ 47,444
Summary of customer related derivative positions, not designated as hedging	The following table reflects the Company’s customer related derivative positions as of the dates indicated below for those derivatives not designated as hedging: Notional Amount Maturing Number of Positions Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value March 31, 2021 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 302 $ 72,391 $ 105,368 $ 137,041 $ 177,153 $ 1,149,151 $ 1,641,104 $ 66,621 Pay fixed, receive variable 302 72,391 105,368 137,041 177,153 1,149,151 1,641,104 (66,615) Foreign exchange contracts Buys foreign currency, sells U.S. currency 30 94,917 6,538 — — — 101,455 2,502 Buys U.S. currency, sells foreign currency 30 94,917 6,538 — — — 101,455 (2,493) Risk participation agreements Participation out 12 6,642 — 2,665 31,804 68,040 109,151 195 Participation in 7 — 30,483 28,866 — 8,436 67,785 (73) Notional Amount Maturing Number of Positions Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value December 31, 2020 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 322 $ 102,999 $ 76,487 $ 149,265 $ 147,422 $ 1,222,557 $ 1,698,730 $ 127,226 Pay fixed, receive variable 313 102,999 76,487 149,265 147,422 1,222,557 1,698,730 (127,216) Foreign exchange contracts Buys foreign currency, sells U.S. currency 33 87,557 5,300 — — — 92,857 (4,214) Buys U.S. currency, sells foreign currency 33 87,557 5,300 — — — 92,857 4,224 Risk participation agreements Participation out 12 6,721 — 2,675 7,307 93,378 110,081 512 Participation in 8 — 30,649 29,072 — 15,844 75,565 (118) (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.
Fair value of derivative financial instruments as well as their classification on the balance sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet and the potential effect of netting arrangements on its financial position, at the dates indicated: Asset Derivatives (1) Liability Derivatives (2) Fair Value at Fair Value at Fair Value at Fair Value at March 31 December 31 March 31 December 31 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives $ 40,776 (3) $ 48,786 (3) $ 2,442 (4) $ 1,342 (4) Derivatives not designated as hedges Customer Related Positions Loan level derivatives 86,890 (3) 127,228 (3) 86,884 (4) 127,218 (4) Foreign exchange contracts 2,691 4,359 2,682 4,349 Risk participation agreements 195 513 73 119 Mortgage Derivatives Interest rate lock commitments 1,652 6,513 — — Forward sale loan commitments 370 — — 1 Forward sale hedge commitments 1,131 — — 1,035 Total derivatives not designated as hedges 92,929 138,613 89,639 132,722 Total 133,705 187,399 92,081 134,064 Netting Adjustments (5) (8,027) 23 7,107 16,105 Net Derivatives on the Balance Sheet 125,678 187,422 84,974 117,959 Financial instruments (6) 50,189 48,786 50,189 48,786 Cash collateral pledged (received) — — 28,799 62,460 Net Derivative Amounts $ 75,489 $ 138,636 $ 5,986 $ 6,713
Effect of derivative financial instruments included in OCI and current earnings	The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: Three Months Ended March 31 2021 2020 (Dollars in thousands) Derivatives designated as hedges Gain (loss) in OCI on derivatives (effective portion), net of tax $ (6,583) $ 22,984 Gain reclassified from OCI into interest income or interest expense (effective portion) $ 4,380 $ 1,586 Loss reclassified from OCI into noninterest expense (loss on termination) $ — $ — Interest expense $ — $ — Other expense — — Total $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 6 $ 22 Other expense (283) (24) Changes in fair value of mortgage derivatives Mortgage banking income (2,324) (721) Total $ (2,601) $ (723)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated: Fair Value Measurements at Reporting Date Using Balance Quoted Prices Significant Significant March 31, 2021 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 3,269 $ 3,269 $ — $ — Equity securities 22,419 22,419 — — Securities available for sale U.S. government agency securities 168,056 — 168,056 — Agency mortgage-backed securities 290,175 — 290,175 — Agency collateralized mortgage obligations 81,629 — 81,629 — State, county, and municipal securities 555 — 555 — Single issuer trust preferred securities issued by banks and insurers 488 — 488 — Pooled trust preferred securities issued by banks and insurers 1,064 — 1,064 — Small business administration pooled securities 58,246 — 58,246 — Loans held for sale 41,632 — 41,632 — Derivative instruments 133,705 — 133,705 — Liabilities Derivative instruments 92,081 — 92,081 — Total recurring fair value measurements $ 709,157 $ 25,688 $ 683,469 $ — Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans (1) $ 31,213 $ — $ — $ 31,213 Total nonrecurring fair value measurements $ 31,213 $ — $ — $ 31,213 Fair Value Measurements at Reporting Date Using Balance Quoted Prices Significant Significant December 31, 2020 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,838 $ 2,838 $ — $ — Equity securities 22,107 22,107 — — Securities available for sale U.S. government agency securities 24,116 — 24,116 — Agency mortgage-backed securities 233,629 — 233,629 — Agency collateralized mortgage obligations 91,683 — 91,683 — State, county, and municipal securities 807 — 807 — Single issuer trust preferred securities issued by banks and insurers 488 — 488 — Pooled trust preferred securities issued by banks and insurers 1,056 — 1,056 — Small business administration pooled securities 61,081 — 61,081 — Loans held for sale 58,104 — 58,104 — Derivative instruments 187,399 — 187,399 — Liabilities Derivative instruments 134,064 — 134,064 — Total recurring fair value measurements $ 549,244 $ 24,945 $ 524,299 $ — Nonrecurring fair value measurements: Assets Individually assessed collateral dependent loans (1) $ 31,510 $ — $ — $ 31,510 Total nonrecurring fair value measurements $ 31,510 $ — $ — $ 31,510
The estimated fair values and related carrying amounts for assets and liabilities	The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated: Fair Value Measurements at Reporting Date Using Carrying Fair Quoted Prices Significant Significant March 31, 2021 (Dollars in thousands) Financial assets Securities held to maturity (a) U.S. Treasury securities $ 4,014 $ 4,057 $ — $ 4,057 $ — Agency mortgage-backed securities 417,811 426,628 — 426,628 — Agency collateralized mortgage obligations 355,686 361,002 — 361,002 — Single issuer trust preferred securities issued by banks 1,500 1,508 — 1,508 — Small business administration pooled securities 26,518 27,235 — 27,235 — Loans, net of allowance for credit losses (b) 9,107,929 9,072,683 — — 9,072,683 Federal Home Loan Bank stock (c) 10,250 10,250 — 10,250 — Cash surrender value of life insurance policies (d) 241,365 241,365 — 241,365 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 10,725,479 $ 10,725,479 $ — $ 10,725,479 $ — Time certificates of deposits (f) 868,045 871,056 — 871,056 — Federal Home Loan Bank borrowings (f) 35,717 35,799 — 35,799 — Long-term borrowings (f) 28,099 27,572 — 27,572 — Junior subordinated debentures (g) 62,851 68,052 — 68,052 — Subordinated debentures (f) 49,720 47,027 — — 47,027 Fair Value Measurements at Reporting Date Using Carrying Fair Quoted Prices Significant Significant December 31, 2020 (Dollars in thousands) Financial assets Securities held to maturity (a) U.S. Treasury securities $ 4,017 $ 4,077 $ — $ 4,077 $ — Agency mortgage-backed securities 356,085 374,121 — 374,121 — Agency collateralized mortgage obligations 335,993 344,119 — 344,119 — Single issuer trust preferred securities issued by banks 1,500 1,498 — 1,498 — Small business administration pooled securities 26,917 28,362 — 28,362 — Loans, net of allowance for credit losses (b) 9,247,964 9,253,381 — — 9,253,381 Federal Home Loan Bank stock (c) 10,250 10,250 — 10,250 — Cash surrender value of life insurance policies (d) 200,525 200,525 — 200,525 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 10,042,541 $ 10,042,541 $ — $ 10,042,541 $ — Time certificates of deposits (f) 950,629 955,598 — 955,598 — Federal Home Loan Bank borrowings (f) 35,740 35,885 — 35,885 — Long-term borrowings (f) 32,773 32,033 — 32,033 — Junior subordinated debentures (g) 62,851 70,238 — 70,238 — Subordinated debentures (f) 49,696 46,486 — — 46,486 (a) The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis. (b) Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis. (c) Federal Home Loan Bank stock has no quoted market value and is carried at cost; therefore the carrying amount approximates fair value. (d) Cash surrender value of life insurance policies is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value. (e) Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date. (f) Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities. (g) Fair value was determined based upon market prices of securities with similar terms and maturities.

Revenue Recognition Revenue (Ta

Revenue Recognition Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents the revenue streams that the Company has disaggregated as of the periods indicated: Three Months Ended March 31 March 31 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 3,584 $ 4,970 Interchange fees 1,903 4,104 ATM fees 625 639 Investment management - wealth management and advisory services 7,402 6,289 Investment management - retail investments and insurance revenue 902 540 Merchant processing income 320 393 Credit card income 236 183 Other noninterest income 1,125 1,212 Total noninterest income in-scope of ASC 606 16,097 18,330 Total noninterest income out-of-scope of ASC 606 9,149 8,105 Total noninterest income $ 25,246 $ 26,435
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides the amount of investment management revenue earned but not received as of the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Receivables, included in other assets $ 4,826 $ 4,636

Comprehensive Income_Loss (Tabl

Comprehensive Income/Loss (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Comprehensive income	The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K.
Company's accumulated other comprehensive loss, net of tax	Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated: Unrealized Gain (Loss) Unrealized Gain on Cash Flow Hedge Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) 2021 Beginning balance: January 1, 2021 $ 13,255 $ 33,276 $ (5,836) $ 40,695 Net change in other comprehensive income (loss) (7,774) (6,583) 819 (13,538) Ending balance: March 31, 2021 $ 5,481 $ 26,693 $ (5,017) $ 27,157 2020 Beginning balance: January 1, 2020 $ 4,398 $ 16,479 $ (2,708) $ 18,169 Net change in other comprehensive income (loss) 9,347 22,984 (772) 31,559 Ending balance: March 31, 2020 $ 13,745 $ 39,463 $ (3,480) $ 49,728

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The following table summarizes the above financial instruments at the dates indicated: March 31, 2021 December 31, 2020 (Dollars in thousands) Commitments to extend credit $ 3,561,078 $ 3,301,692 Standby letters of credit 20,385 20,686 Deferred standby letter of credit fees 169 164 Loan exposures with recourse 261,713 303,265

Securities Securities (Equity g

Securities Securities (Equity gains and losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity securities gains and losses [Abstract]
Equity Securities, FV-NI, Gain (Loss)	$ 316	$ (1,801)
Equity Securities, FV-NI, Realized Gain (Loss)	29	6
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 287	$ (1,807)

Securities (Reconciliation of f

Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	$ 13,548	$ 17,869
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(6,502)	(462)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	600,213	412,860
Debt Securities, Available-for-sale, Amortized Cost	593,167	395,453
U.S. government agency securities
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,209	1,640
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,244)	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	168,056	24,116
Debt Securities, Available-for-sale, Amortized Cost	169,091	22,476
Agency mortgage-backed securities
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7,561	9,337
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,898)	(1)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	290,175	233,629
Debt Securities, Available-for-sale, Amortized Cost	286,512	224,293
Agency Collateralized Mortgage Obligations [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,688	3,083
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(11)	(87)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	81,629	91,683
Debt Securities, Available-for-sale, Amortized Cost	78,952	88,687
US States and Political Subdivisions Debt Securities [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15	17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	555	807
Debt Securities, Available-for-sale, Amortized Cost	540	790
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	(1)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	488	488
Debt Securities, Available-for-sale, Amortized Cost	489	489
Pooled trust preferred securities issued by banks and insurers
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(348)	(373)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	1,064	1,056
Debt Securities, Available-for-sale, Amortized Cost	1,412	1,429
Small Business Administration Pooled Securities [Member]
Reconciliation of fair value of securities
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,075	3,792
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale	58,246	61,081
Debt Securities, Available-for-sale, Amortized Cost	$ 56,171	$ 57,289

Securities Securities (Availabl

Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands	Mar. 31, 2021USD ($)holding	Dec. 31, 2020USD ($)holding
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	15	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 221,563	$ 24,248
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(6,153)	(89)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,552	1,056
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(349)	(373)
Debt Securities, Available-for-sale, Unrealized Loss Position	223,115	25,304
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 6,502	$ 462
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	8	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 98,873	$ 437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,898)	(1)
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	98,873	437
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3,898	$ 1
Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,519	$ 23,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(11)	(87)
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	9,519	23,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 11	$ 87
Single issuer trust preferred securities issued by banks and insurers
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	488	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	488	488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 1
Pooled trust preferred securities issued by banks and insurers
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1	1
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	1,064	1,056
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(348)	(373)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,064	1,056
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 348	$ 373
U.S. government agency securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 113,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,244)
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	113,171
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,244

Securities Securities (Reconcil

Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 805,529	$ 724,512
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	21,311	28,007
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,410)	(342)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	820,430	752,177
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	26,518	26,917
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	717	1,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	27,235	28,362
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	8	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(2)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	1,508	1,498
Collateralized Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	355,686	335,993
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	7,474	8,466
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2,158)	(340)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	361,002	344,119
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	417,811	356,085
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	13,069	18,036
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4,252)	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	426,628	374,121
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,014	4,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	43	60
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	$ 4,057	$ 4,077

Securities (Schedule of Contrac

Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for Sale, Fair Value
Debt Securities, Available-for-sale, Amortized Cost	$ 593,167	$ 395,453
Debt Securities, Available-for-sale	600,213	412,860
Held to Maturity, Fair Value
Debt Securities, Held-to-maturity	805,529	724,512
Held to Maturity, Fair Value, Total	820,430	752,177
Available for Sale Securities and Held to Maturity Securities Amortized Cost	1,398,696
Debt Securities, Available-for-sale and Held-to-maturity	1,420,643
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	14,365
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	14,588
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	84,783
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	87,678
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	388,485
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	384,403
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	911,063
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Fair Value	933,974
U.S. government agency securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	10,001
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	159,090
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	10,180
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	157,876
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	169,091	22,476
Debt Securities, Available-for-sale	168,056	24,116
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	56,171
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	58,246
Debt Securities, Available-for-sale, Amortized Cost	56,171	57,289
Debt Securities, Available-for-sale	58,246	61,081
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	26,518
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	27,235
Debt Securities, Held-to-maturity	26,518	26,917
Held to Maturity, Fair Value, Total	27,235	28,362
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	10,351
Available for Sale, Amortized Cost, Due after one year to five years	80,169
Available for Sale, Amortized Cost, Due after five to ten years	258,027
Available for Sale, Amortized Cost, Due after ten years	244,620
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	10,531
Available for Sale, Fair Value, Due after one year to five years	82,809
Available for Sale, Fair Value, Due after five to ten years	254,994
Available for Sale, Fair Value, Due after ten years	251,879
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	4,014
Held to Maturity, Amortized Cost, Due after one year to five years	4,614
Held to Maturity, Amortized Cost, Due after five to ten years	130,458
Held to Maturity, Amortized Cost, Due after ten years	666,443
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	4,057
Held to Maturity, Fair Value, Due after one year to five years	4,869
Held to Maturity, Fair Value, Due after five to ten years	129,409
Held to Maturity, Fair Value, Due after ten years	682,095
Held to Maturity, Fair Value, Total	820,430
Pooled trust preferred securities issued by banks and insurers
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	1,412
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	1,064
Debt Securities, Available-for-sale, Amortized Cost	1,412	1,429
Debt Securities, Available-for-sale	1,064	1,056
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	489
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	488
Debt Securities, Available-for-sale, Amortized Cost	489	489
Debt Securities, Available-for-sale	488	488
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	1,500
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	1,508
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	1,500	1,500
Held to Maturity, Fair Value, Total	1,508	1,498
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	350
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	190
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	351
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	204
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	540	790
Debt Securities, Available-for-sale	555	807
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	78,952
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	81,629
Debt Securities, Available-for-sale, Amortized Cost	78,952	88,687
Debt Securities, Available-for-sale	81,629	91,683
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	355,686
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	361,002
Debt Securities, Held-to-maturity	355,686	335,993
Held to Maturity, Fair Value, Total	361,002	344,119
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	80,169
Available for Sale, Amortized Cost, Due after five to ten years	98,747
Available for Sale, Amortized Cost, Due after ten years	107,596
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	82,809
Available for Sale, Fair Value, Due after five to ten years	96,914
Available for Sale, Fair Value, Due after ten years	110,452
Debt Securities, Available-for-sale, Amortized Cost	286,512	224,293
Debt Securities, Available-for-sale	290,175	233,629
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	4,614
Held to Maturity, Amortized Cost, Due after five to ten years	128,958
Held to Maturity, Amortized Cost, Due after ten years	284,239
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	4,869
Held to Maturity, Fair Value, Due after five to ten years	127,901
Held to Maturity, Fair Value, Due after ten years	293,858
Debt Securities, Held-to-maturity	417,811	356,085
Held to Maturity, Fair Value, Total	426,628	374,121
US Treasury Securities [Member]
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	4,014
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	4,057
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-maturity	4,014	4,017
Held to Maturity, Fair Value, Total	$ 4,057	$ 4,077

Securities (Details Textual) (D

Securities (Details Textual) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	$ 33,400		$ 25,900
Trading	3,269	$ 2,838
Debt Securities, Available-for-sale	600,213	412,860
Debt Securities, Held-to-maturity, Past Due	0	0
Debt Securities, Available-for-sale, Past due	0	0
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Available-for-sale, Past due	0	0
Debt Securities, Available-for-sale, Nonaccrual	0	0
Debt Securities, Held-to-maturity, Past Due	0	0
Debt Securities, Held-to-maturity, Nonaccrual	0	0
Securities (Textual) [Abstract]
Callable Securities in Investment Portfolio	3,300
Pledged Financial Instruments, Not Separately Reported, Securities	420,200	419,600
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Held-to-maturity	805,529	724,512
Equity Securities, FV-NI	22,419	22,107
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	2,000	1,200
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	$ 1,600	$ 1,500

Loans, Allowance for Credit L_3

Loans, Allowance for Credit Losses and Credit Quality Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 107,549		$ 113,392	$ 67,740
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		$ (1,137)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	1,200	1,157
Allowance for Loan and Lease Losses, Write-offs	(3,686)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	343
Provision for Loan and Lease Losses	(2,500)
Loans and Leases Receivable, Allowance	107,549	92,376	113,392
Provision for credit losses	(2,500)	25,000
Allowance for Loan and Lease Loss, Recovery of Bad Debts		350
Allowance for Loan and Lease Losses, Write-offs		(734)
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	20,207		21,086	17,594
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		(1,984)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		49
Allowance for Loan and Lease Losses, Write-offs	(3,331)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	64
Provision for Loan and Lease Losses	2,388
Loans and Leases Receivable, Allowance		21,649
Provision for credit losses		5,948
Allowance for Loan and Lease Loss, Recovery of Bad Debts		42
Allowance for Loan and Lease Losses, Write-offs		0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	44,348		45,009	32,935
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		(13,048)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		337
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	57
Provision for Loan and Lease Losses	(718)
Loans and Leases Receivable, Allowance		29,498
Provision for credit losses		9,274
Allowance for Loan and Lease Loss, Recovery of Bad Debts		0
Allowance for Loan and Lease Losses, Write-offs		0
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	5,268		5,397	6,053
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		(3,652)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		0
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0
Provision for Loan and Lease Losses	(129)
Loans and Leases Receivable, Allowance		3,747
Provision for credit losses		1,346
Allowance for Loan and Lease Loss, Recovery of Bad Debts		0
Allowance for Loan and Lease Losses, Write-offs		0
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	3,621		5,095	1,746
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		495
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		0
Allowance for Loan and Lease Losses, Write-offs	(66)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	11
Provision for Loan and Lease Losses	(1,419)
Loans and Leases Receivable, Allowance		3,829
Provision for credit losses		1,694
Allowance for Loan and Lease Loss, Recovery of Bad Debts		3
Allowance for Loan and Lease Losses, Write-offs		(109)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	12,956		14,275	3,440
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		9,828
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		423
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1
Provision for Loan and Lease Losses	(1,320)
Loans and Leases Receivable, Allowance		14,847
Provision for credit losses		1,155
Allowance for Loan and Lease Loss, Recovery of Bad Debts		1
Allowance for Loan and Lease Losses, Write-offs		0
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	20,716		22,060	5,576
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		7,012
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		319
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	13
Provision for Loan and Lease Losses	(1,357)
Loans and Leases Receivable, Allowance		17,910
Provision for credit losses		5,083
Allowance for Loan and Lease Loss, Recovery of Bad Debts		58
Allowance for Loan and Lease Losses, Write-offs		(138)
Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	433		$ 470	$ 396
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		212
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		29
Allowance for Loan and Lease Losses, Write-offs	(289)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	197
Provision for Loan and Lease Losses	$ 55
Loans and Leases Receivable, Allowance		896
Provision for credit losses		500
Allowance for Loan and Lease Loss, Recovery of Bad Debts		246
Allowance for Loan and Lease Losses, Write-offs		$ (487)

Loans, Allowance for Credit L_4

Loans, Allowance for Credit Losses and Credit Quality Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	$ 2,425,930		$ 1,711,032
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,232,875		1,267,076
Financing Receivable, Originated Three Years before Latest Fiscal Year	787,014		1,131,429
Financing Receivable, Originated Four Years before Latest Fiscal Year	801,171		879,559
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,840,588		1,749,590
Financing Receivable, Revolving	1,353,864		1,674,656
Financing Receivable, after Allowance for Credit Loss	803,487		497,485
Loans and Leases Receivable, Gross	9,246,691	$ 9,392,866	8,916,430
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,095,178		955,120
Financing Receivable, Originated Two Years before Latest Fiscal Year	745,562		627,312
Financing Receivable, Originated Three Years before Latest Fiscal Year	467,476		680,236
Financing Receivable, Originated Four Years before Latest Fiscal Year	553,067		485,668
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,067,973		999,942
Financing Receivable, Revolving	29,808		48,056
Financing Receivable, after Allowance for Credit Loss	218,553		262,026
Loans and Leases Receivable, Gross	4,177,617	4,173,927	4,061,347
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	29,218		8,303
Financing Receivable, Originated Two Years before Latest Fiscal Year	53,849		33,755
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,274		8,506
Financing Receivable, Originated Four Years before Latest Fiscal Year	18,981		9,851
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	86,160		42,382
Financing Receivable, Revolving	13,612		0
Financing Receivable, after Allowance for Credit Loss	390		1,809
Loans and Leases Receivable, Gross	233,484		104,606
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,043,424		943,205
Financing Receivable, Originated Two Years before Latest Fiscal Year	687,959		586,125
Financing Receivable, Originated Three Years before Latest Fiscal Year	432,728		651,335
Financing Receivable, Originated Four Years before Latest Fiscal Year	524,194		468,824
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	966,331		945,248
Financing Receivable, Revolving	16,196		48,056
Financing Receivable, after Allowance for Credit Loss	214,573		260,217
Loans and Leases Receivable, Gross	3,885,405		3,905,997
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	22,536		3,612
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,754		7,432
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,474		20,395
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,892		6,993
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	15,482		12,312
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	3,590		0
Loans and Leases Receivable, Gross	58,728		50,744
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	0		0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	0		0
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	740,231		221,485
Financing Receivable, Originated Two Years before Latest Fiscal Year	131,206		165,871
Financing Receivable, Originated Three Years before Latest Fiscal Year	92,445		60,821
Financing Receivable, Originated Four Years before Latest Fiscal Year	32,793		40,014
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	30,953		35,897
Financing Receivable, Revolving	617,025		803,016
Financing Receivable, after Allowance for Credit Loss	442,018		120,743
Loans and Leases Receivable, Gross	2,086,671	2,103,152	1,448,224
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14,991		5,432
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,636		1,489
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,148		4,909
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,288		725
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,205		697
Financing Receivable, Revolving	12,252		21,780
Financing Receivable, after Allowance for Credit Loss	3,424		362
Loans and Leases Receivable, Gross	42,944		35,444
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	724,577		213,925
Financing Receivable, Originated Two Years before Latest Fiscal Year	127,454		138,376
Financing Receivable, Originated Three Years before Latest Fiscal Year	88,970		50,323
Financing Receivable, Originated Four Years before Latest Fiscal Year	25,737		36,685
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27,123		33,576
Financing Receivable, Revolving	589,448		736,304
Financing Receivable, after Allowance for Credit Loss	420,682		119,886
Loans and Leases Receivable, Gross	2,003,991		1,329,402
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	663		2,128
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,116		26,006
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,327		5,589
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,768		2,604
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	482		1,575
Financing Receivable, Revolving	6,927		44,932
Financing Receivable, after Allowance for Credit Loss	17,912		495
Loans and Leases Receivable, Gross	31,195		83,329
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	143		49
Financing Receivable, Revolving	8,398		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	8,541		49
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	257,498		222,327
Financing Receivable, Originated Two Years before Latest Fiscal Year	151,767		116,795
Financing Receivable, Originated Three Years before Latest Fiscal Year	28,709		92,537
Financing Receivable, Originated Four Years before Latest Fiscal Year	23,313		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,628		6,867
Financing Receivable, Revolving	20,124		44,918
Financing Receivable, after Allowance for Credit Loss	28,323		43,369
Loans and Leases Receivable, Gross	516,362	553,929	527,138
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17,544		554
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,691		347
Financing Receivable, Originated Three Years before Latest Fiscal Year			19,044
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	190		347
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	27,425		20,292
Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	239,954		221,773
Financing Receivable, Originated Two Years before Latest Fiscal Year	142,076		114,561
Financing Receivable, Originated Three Years before Latest Fiscal Year	28,189		73,493
Financing Receivable, Originated Four Years before Latest Fiscal Year	23,313		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,628		6,867
Financing Receivable, Revolving	19,934		44,225
Financing Receivable, after Allowance for Credit Loss	28,323		43,369
Loans and Leases Receivable, Gross	488,417		504,613
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year			1,887
Financing Receivable, Originated Three Years before Latest Fiscal Year	520		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving			346
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	520		2,233
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	0		0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	0		0
Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	42,095		31,710
Financing Receivable, Originated Two Years before Latest Fiscal Year	26,257		25,335
Financing Receivable, Originated Three Years before Latest Fiscal Year	18,013		17,912
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,651		18,516
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	29,812		27,591
Financing Receivable, Revolving	35,076		48,342
Financing Receivable, after Allowance for Credit Loss	10,307		8,414
Loans and Leases Receivable, Gross	174,211	175,023	177,820
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year			12
Financing Receivable, Originated Two Years before Latest Fiscal Year	389		18
Financing Receivable, Originated Three Years before Latest Fiscal Year	204		13
Financing Receivable, Originated Four Years before Latest Fiscal Year	10		753
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	202		259
Financing Receivable, Revolving	634		597
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	1,439		1,652
Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	41,418		31,651
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,817		25,184
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,750		17,848
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,624		17,594
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	29,309		26,734
Financing Receivable, Revolving	33,658		47,109
Financing Receivable, after Allowance for Credit Loss	10,307		8,414
Loans and Leases Receivable, Gross	170,883		174,534
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	677		47
Financing Receivable, Originated Two Years before Latest Fiscal Year	51		133
Financing Receivable, Originated Three Years before Latest Fiscal Year	59		51
Financing Receivable, Originated Four Years before Latest Fiscal Year	17		169
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	301		598
Financing Receivable, Revolving	758		636
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	1,863		1,634
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	26		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	26		0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	0		0
Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	212,891		204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	126,359		261,326
Financing Receivable, Originated Three Years before Latest Fiscal Year	133,577		211,097
Financing Receivable, Originated Four Years before Latest Fiscal Year	130,580		283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	557,725		529,092
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	80,657		39,122
Loans and Leases Receivable, Gross	1,241,789	$ 1,296,183	1,528,416
Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year			427
Financing Receivable, Originated Three Years before Latest Fiscal Year	427		435
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,877		5,350
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	3,304		6,212
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	212,891		204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	126,359		260,899
Financing Receivable, Originated Three Years before Latest Fiscal Year	133,150		210,662
Financing Receivable, Originated Four Years before Latest Fiscal Year	130,580		283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	554,848		523,742
Financing Receivable, Revolving	0		0
Financing Receivable, after Allowance for Credit Loss	80,657		39,122
Loans and Leases Receivable, Gross	1,238,485		1,522,204
Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	77,497		75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	51,398		70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	46,648		67,758
Financing Receivable, Originated Four Years before Latest Fiscal Year	48,132		51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	140,586		139,312
Financing Receivable, Revolving	638,889		717,541
Financing Receivable, after Allowance for Credit Loss	23,583		23,397
Loans and Leases Receivable, Gross	1,028,495		1,146,270
Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year			18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	210		579
Financing Receivable, Revolving	2,008		2,372
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	2,218		3,030
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	77,497		75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	51,398		70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	46,648		67,740
Financing Receivable, Originated Four Years before Latest Fiscal Year	48,132		51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	140,376		138,733
Financing Receivable, Revolving	636,881		715,169
Financing Receivable, after Allowance for Credit Loss	23,583		23,397
Loans and Leases Receivable, Gross	1,026,277		1,143,240
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	540		705
Financing Receivable, Originated Two Years before Latest Fiscal Year	326		356
Financing Receivable, Originated Three Years before Latest Fiscal Year	146		1,068
Financing Receivable, Originated Four Years before Latest Fiscal Year	635		1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,911		10,889
Financing Receivable, Revolving	12,942		12,783
Financing Receivable, after Allowance for Credit Loss	46		414
Loans and Leases Receivable, Gross	21,546		27,215
Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		19
Financing Receivable, Originated Four Years before Latest Fiscal Year	15		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	111		39
Financing Receivable, Revolving	3		16
Financing Receivable, after Allowance for Credit Loss	0		0
Loans and Leases Receivable, Gross	129		74
Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	540		705
Financing Receivable, Originated Two Years before Latest Fiscal Year	326		356
Financing Receivable, Originated Three Years before Latest Fiscal Year	146		1,049
Financing Receivable, Originated Four Years before Latest Fiscal Year	620		1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,800		10,850
Financing Receivable, Revolving	12,939		12,767
Financing Receivable, after Allowance for Credit Loss	46		414
Loans and Leases Receivable, Gross	21,417		27,141
Revolving converted to term [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,762		5,603
Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			377
Revolving converted to term [Member] | Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			50
Revolving converted to term [Member] | Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			327
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			325
Revolving converted to term [Member] | Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			325
Revolving converted to term [Member] | Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,762		1,914
Revolving converted to term [Member] | Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving			61
Revolving converted to term [Member] | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,762		1,853
Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0		0
Revolving converted to term [Member] | Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	$ 0		$ 0

Loans, Allowance for Credit L_5

Loans, Allowance for Credit Losses and Credit Quality FICO and LTV (Details) - score		Mar. 31, 2021	Dec. 31, 2020
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	749	749
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	56.50%	57.40%
Home Equity Line of Credit [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	772	771
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	45.90%	46.00%
[1]	The average FICO scores at March 31, 2021 are based upon rescores from March 2021, as available for previously originated loans, or origination score data for loans booked in March 2021.  The average FICO scores at December 31, 2020 were based upon rescores available from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020.
[2]	The combined LTV ratios for March 31, 2021 are based upon updated automated valuations as of February 2021, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2020 were based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available as of such date.  The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained.  If no new information is available, the valuation will default to the previously obtained data or most recent appraisal.
[3]	For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.

Loans, Allowance for Credit L_6

Loans, Allowance for Credit Losses and Credit Quality Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2021		Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	$ 28,499		$ 31,332
Financing Receivable, Nonaccrual, No Allowance	30,701		35,528
Tdrs Recorded Investment On Nonaccrual Status	21,167		22,209
Financing Receivable Recorded Investment Trouble Debt Restructuring	41,429		39,192
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring	466		263
Financing Receivable, Nonaccrual	59,200	[1]	66,860
Tdrs Recorded Investment On Accrual Status	20,262		16,983
Commercial And Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	3,606		3,804
Financing Receivable, Nonaccrual, No Allowance	26,179		30,925
Financing Receivable, Nonaccrual	29,785		34,729
Commercial Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	9,635		10,195
Financing Receivable, Nonaccrual	9,635		10,195
Small Business [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	660		815
Financing Receivable, Nonaccrual, No Allowance			10
Financing Receivable, Nonaccrual	660		825
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	8,870		10,935
Financing Receivable, Nonaccrual, No Allowance	4,522		4,593
Financing Receivable, Nonaccrual	13,392		15,528
Home Equity Line of Credit [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	5,592		5,427
Financing Receivable, Nonaccrual	5,592		5,427
Consumer - Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	136		156
Financing Receivable, Nonaccrual	$ 136		$ 156
[1]	Included in these amounts were $21.2 million and $22.2 million of nonaccruing TDRs at March 31, 2021 and December 31, 2020, respectively.

Loans, Allowance for Credit L_7

Loans, Allowance for Credit Losses and Credit Quality Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Foreclosed residential real estate property held by the creditor	$ 0	$ 0
Mortgage Loans in Process of Foreclosure, Amount	$ 1,628	$ 1,750

Loans, Allowance for Credit L_8

Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands		Mar. 31, 2021USD ($)loan	Dec. 31, 2020USD ($)loan	Mar. 31, 2020USD ($)
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		226	301
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 1	$ 1
Financing Receivable, Past Due		11,024	21,396
Financing Receivable, Not Past Due		9,235,667	9,371,470
Loans and Leases Receivable, Gross		$ 9,246,691	$ 9,392,866	$ 8,916,430
Number Of Financing Receivables Total Past Due | loan		312	408
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		7	25
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		79	82
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		6	2
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		651	1,775
Financing Receivable, Not Past Due		2,086,020	2,101,377
Loans and Leases Receivable, Gross		$ 2,086,671	$ 2,103,152	1,448,224
Number Of Financing Receivables Total Past Due | loan		16	11
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0	1
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		10	8
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		3	3
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		1,399	924
Financing Receivable, Not Past Due		4,176,218	4,173,003
Loans and Leases Receivable, Gross		$ 4,177,617	$ 4,173,927	4,061,347
Number Of Financing Receivables Total Past Due | loan		7	7
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0	0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		4	4
Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		0	0
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		0	2,794
Financing Receivable, Not Past Due		516,362	551,135
Loans and Leases Receivable, Gross		$ 516,362	$ 553,929	527,138
Number Of Financing Receivables Total Past Due | loan		0	2
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0	2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		0	0
Small Business [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		5	14
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		94	753
Financing Receivable, Not Past Due		174,117	174,270
Loans and Leases Receivable, Gross		$ 174,211	$ 175,023	177,820
Number Of Financing Receivables Total Past Due | loan		9	24
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		1	6
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		3	4
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		9	12
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		5,853	11,305
Financing Receivable, Not Past Due		1,235,936	1,284,878
Loans and Leases Receivable, Gross		$ 1,241,789	$ 1,296,183	$ 1,528,416
Number Of Financing Receivables Total Past Due | loan		40	47
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		3	8
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		28	27
Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		7	10
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0	$ 0
Financing Receivable, Past Due		2,729	3,569
Financing Receivable, Not Past Due		1,025,766	1,065,221
Loans and Leases Receivable, Gross		$ 1,028,495	$ 1,068,790
Number Of Financing Receivables Total Past Due | loan		36	48
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		2	5
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		27	33
Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	[1]	196	260
Financing Receivable, 90 Days or More Past Due, Still Accruing	[1]	$ 1	$ 1
Financing Receivable, Past Due	[1]	298	276
Financing Receivable, Not Past Due	[1]	21,248	21,586
Loans and Leases Receivable, Gross	[1]	$ 21,546	$ 21,862
Number Of Financing Receivables Total Past Due | loan	[1]	204	269
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	[1]	1	3
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	[1]	7	6
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		$ 854	$ 9,450
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		0	672
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		0	2,794
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		2	273
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		764	5,507
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		87	203
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	[1]	1	1
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		6,872	7,778
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		141	785
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		511	515
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		36	59
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		3,837	3,648
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		2,217	2,633
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	[1]	130	138
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		3,298	4,168
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		510	318
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		888	409
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		56	421
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		1,252	2,150
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due		425	733
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	[1]	$ 167	$ 137
[1]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Loans, Allowance for Credit L_9

Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)contract	Mar. 31, 2020USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	7	5
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 18,212	$ 1,098
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 18,212	$ 1,106
Commercial And Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 14,148	$ 268
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 14,148	$ 268
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 3,964	$ 604
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3,964	$ 604
Small Business [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 100	$ 49
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 100	$ 25
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 177
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 209

Loans, Allowance for Credit _10

Loans, Allowance for Credit Losses and Credit Quality Schedule of Debtor Troubled Debt Restructurings, Subsequent Period (Details)	3 Months Ended
	Mar. 31, 2021USD ($)contract	Mar. 31, 2020USD ($)contract
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | contract	7	5
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 18,212,000	$ 1,098,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 18,212,000	$ 1,106,000
Commercial And Industrial [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 14,148,000	$ 268,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 14,148,000	$ 268,000
Commercial Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 3,964,000	$ 604,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3,964,000	$ 604,000
Small Business [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 100,000	$ 49,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 100,000	$ 25,000
Residential Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 177,000
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 209,000

Loans, Allowance for Credit _11

Loans, Allowance for Credit Losses and Credit Quality TDR on Financing Receivables Post Modification (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 18,212,000	$ 1,106,000
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification		1,106,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0	0
Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	604,000
Court ordered concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	25,000
Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	4,064,000	477,000
Combination rate and maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 14,148,000	$ 0

Loans, Allowance for Credit _12

Loans, Allowance for Credit Losses and Credit Quality Textual (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Days To Be Termed As Non Accrual Loans	90 days
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) by percentage	(5.20%)
Provision for credit losses	$ (2,500,000)	$ 25,000,000
Interest Receivable	33,400,000	25,900,000
Off-Balance Sheet, Credit Loss, Liability	1,000,000		$ 1,200,000
Loans with active Deferrals	220,600,000		173,600,000
Allowance for Loan and Lease Losses, Write-offs	(3,686,000)
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification		1,106,000
us-gaap_FinancingReceivableTroubledDebtRestructuringIncreaseDecreaseFromModification	14,300,000	872,000,000
Loans with active Deferrals	220,600,000		173,600,000
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		(1,137,000)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	1,200,000	1,157,000
Interest Receivable	33,400,000	25,900,000
Loans and Leases Receivable, Allowance	(107,549,000)	(92,376,000)	(113,392,000)
Off-Balance Sheet, Credit Loss, Liability	1,000,000		1,200,000
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	5,800,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0	0
US Government Insured Loan Program [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, before Allowance for Credit Loss	340,000,000		506,300,000
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses		5,948,000
Financing Receivable, before Allowance for Credit Loss	2,086,671,000		$ 2,103,152,000
Allowance for Loan and Lease Losses, Write-offs	(3,331,000)
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method		(1,984,000)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		49,000
Loans and Leases Receivable, Allowance		$ (21,649,000)
Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 846,300,000

Stock Based Compensation (Award

Stock Based Compensation (Awards of Restricted Stock) (Details) - Ratably Over Period [Member] - 2/18/2021 - Employee Stock [Member] - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted | shares	49,550
Grant Date Fair Value Per Share | $ / shares	$ 81.84
Vesting Period	Ratably over 5 years from grant date

Stock Based Compensation Perfor

Stock Based Compensation Performance-based Restricted Stock Textual (Details) - Employee Stock Plan [Member] - Performance Shares [Member]	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	18,900
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 81.84
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	13,005

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Change in Fair Value on Loans Held for Sale	$ (1,764)	$ 255
Fair Value Hedges, Net	0		$ 0
Interest Receivable	33,400	$ 25,900
Derivative, Net Liability Position, Aggregate Fair Value	28,500		79,800
Exposure to Institutional Counterparties	50,900		48,800
Exposure To Counterparties Relating To Customer Related Positions	76,800		127,200
Interest rate collars on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount	$ 400,000		$ 400,000
Derivative, Average Remaining Maturity	2 years 4 months 28 days		2 years 7 months 28 days
Derivative, Average Variable Interest Rate	0.11%		0.15%
Fair Value	$ 17,942		$ 21,764
Derivative, Average Cap Interest Rate	2.73%		2.73%
Derivative, Average Floor Interest Rate	2.20%		2.20%
Interest rate swaps on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount	$ 550,000		$ 450,000
Derivative, Average Remaining Maturity	3 years 3 months 29 days		2 years 7 months 28 days
Derivative, Average Variable Interest Rate	0.10%		0.15%
Derivative, Average Fixed Interest Rate	2.16%		2.37%
Fair Value	$ 21,467		$ 27,021
Interest rate swaps on borrowings [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount	$ 75,000		$ 75,000
Derivative, Average Remaining Maturity	11 months 4 days		1 year 2 months 4 days
Derivative, Average Variable Interest Rate	0.19%		0.22%
Derivative, Average Fixed Interest Rate	1.53%		1.53%
Fair Value	$ (1,075)		$ (1,341)
Interest rate swaps
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Derivative, Notional Amount	1,025,000		925,000
Fair Value	38,334		47,444
Interest Receivable	1,200		1,200
Interest Payable, Current	$ (56)		$ (81)

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Mar. 31, 2021USD ($)position	Dec. 31, 2020USD ($)position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	302	322
Less than 1 year		$ 72,391	$ 102,999
Less than 2 years		105,368	76,487
Less than 3 years		137,041	149,265
Less than 4 years		177,153	147,422
Thereafter		1,149,151	1,222,557
Derivative, Notional Amount		1,641,104	1,698,730
Fair Value		$ 66,621	$ 127,226
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	302	313
Less than 1 year		$ 72,391	$ 102,999
Less than 2 years		105,368	76,487
Less than 3 years		137,041	149,265
Less than 4 years		177,153	147,422
Thereafter		1,149,151	1,222,557
Derivative, Notional Amount		1,641,104	1,698,730
Fair Value		$ (66,615)	$ (127,216)
Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	30	33
Less than 1 year		$ 94,917	$ 87,557
Less than 2 years		6,538	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		101,455	92,857
Fair Value		$ 2,502	$ (4,214)
Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	30	33
Less than 1 year		$ 94,917	$ 87,557
Less than 2 years		6,538	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		101,455	92,857
Fair Value		$ (2,493)	$ 4,224
Risk Participated Out | Risk Participation Agreement
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position		12	12
Less than 1 year		$ 6,642	$ 6,721
Less than 2 years		0	0
Less than 3 years		2,665	2,675
Less than 4 years		31,804	7,307
Thereafter		68,040	93,378
Derivative, Notional Amount		109,151	110,081
Fair Value		$ 195	$ 512
Risk Participated In | Risk Participation Agreement
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position		7	8
Less than 1 year		$ 0	$ 0
Less than 2 years		30,483	30,649
Less than 3 years		28,866	29,072
Less than 4 years			0
Thereafter		8,436	15,844
Derivative, Notional Amount		67,785	75,565
Fair Value		$ (73)	$ (118)
[1]	The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset	[1]	$ 125,678	$ 187,422
Derivative Liability	[2]	84,974	117,959
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]	75,489	138,636
Derivative, Collateral, Obligation to Return Securities	[3]	50,189	48,786
Derivative, Collateral, Right to Reclaim Securities	[3]	50,189	48,786
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative, Collateral, Right to Reclaim Cash		28,799	62,460
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	5,986	6,713
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	[1]	92,929	138,613
Derivative Asset, Fair Value, Gross Asset	[1]	133,705	187,399
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	[2]	89,639	132,722
Liability Derivatives	[2]	92,081	134,064
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Assets, at Fair Value	[1],[4]	40,776	48,786
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	[2],[5]	2,442	1,342
Loan level swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1],[4]	86,890	127,228
Loan level swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2],[5]	86,884	127,218
Foreign exchange contracts | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,691	4,359
Foreign exchange contracts | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2]	2,682	4,349
Risk Participation Agreement | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Credit Risk Derivative Assets, at Fair Value	[1]	195	513
Risk Participation Agreement | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Credit Risk Derivative Liabilities, at Fair Value	[2]	73	119
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Asset at Fair Value	[1]	1,652	6,513
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Asset at Fair Value	[1]	370	0
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Asset at Fair Value	[1]	1,131	0
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Liabilities at Fair Value	[2]	0	0
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Liabilities at Fair Value	[2]	0	1
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Liability at Fair Value	[2]	0	1,035
CME [Member]
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Obligation to Return Cash	[6]	8,027	(23)
Derivative, Collateral, Right to Reclaim Cash	[6]	$ 7,107	$ 16,105
[1]	All asset derivatives are located in other assets on the balance sheet.
[2]	All liability derivatives are located in other liabilities on the balance sheet.
[3]	Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.
[4]	Approximately $1.2 million and $1.7 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2021. Accrued interest receivable of approximately and $1.2 million and $2.0 million is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2020.
[5]	Approximately $56,000 and $1.7 million of accrued interest payable is included in the fair value of the interest rate and loan level liability derivatives, respectively, as of March 31, 2021. Accrued interest payable of approximately $81,000 and $2.0 million is included in the fair value of the interest rate and loan level derivative liabilities, respectively, as of December 31, 2020.
[6]	Netting adjustments represent the amounts recorded to convert derivative assets and liabilities cleared through CME from a gross basis to a net basis, inclusive of the variation margin payments, in accordance with applicable accounting guidance. As displayed in the table above, derivatives that cleared through the CME were either in a net asset position or a net liability position as of March 31, 2021.

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	$ 0	$ 0
Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain reclassified from OCI into interest income or interest expense (effective portion)	4,380	1,586
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(2,601)	(723)
Other expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	6	22
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(283)	(24)
Total | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Mortgage banking income	(2,324)	(721)
Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	$ (6,583)	$ 22,984

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities (Textual) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Line Items]
Interest Receivable	$ 33,400,000	$ 25,900,000
Derivative, Net Liability Position, Aggregate Fair Value	$ 28,500,000		$ 79,800,000
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	8 years
Gain (Loss) on Sales of Loans, Net	$ 8,100,000	4,500,000
Exposure to Institutional Counterparties	50,900,000		48,800,000
Customer related positions	76,800,000		127,200,000
Fair Value Hedges, Net	0		0
Change in Fair Value on Loans Held for Sale	(1,764,000)	255,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	0	$ 0
Interest rate swaps
Derivative [Line Items]
Interest Receivable	1,200,000		1,200,000
Derivative, Notional Amount	1,025,000,000		925,000,000
Interest Payable, Current	$ (56,000)		$ (81,000)
Interest rate collars on loans [Member]
Derivative [Line Items]
Derivative, Average Cap Interest Rate	2.73%		2.73%
Derivative, Average Floor Interest Rate	2.20%		2.20%
Derivative, Notional Amount	$ 400,000,000		$ 400,000,000
Loan level swaps
Derivative [Line Items]
Interest Receivable	1,700,000		2,000,000
Interest Payable, Current	(1,700,000)		(2,000,000)
Interest rate swaps on borrowings [Member]
Derivative [Line Items]
Derivative, Notional Amount	75,000,000		$ 75,000,000
Interest Income [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	19,400,000
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (844,000)

Fair Value Measurements (Detail

Fair Value Measurements (Details 1) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
ASSETS
Trading		$ 3,269	$ 2,838
Equity Securities, FV-NI		22,419	22,107
Debt Securities, Available-for-sale		600,213	412,860
U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		168,056	24,116
Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		290,175	233,629
Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,064	1,056
Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		58,246	61,081
Recurring fair value measurements
ASSETS
Trading		3,269	2,838
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		709,157	549,244
Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		22,419	22,107
Recurring fair value measurements | U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		168,056	24,116
Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		290,175	233,629
Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Debt Securities, Available-for-sale		81,629	91,683
Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale		555	807
Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		488	488
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,064	1,056
Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		58,246	61,081
Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		41,632	58,104
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		133,705	187,399
Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		92,081	134,064
Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		31,213	31,510
Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure	[1]	31,213	31,510
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements
ASSETS
Trading		3,269	2,838
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		25,688	24,945
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		22,419	22,107
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale			0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		0	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		683,469	524,299
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		0	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities
ASSETS
Debt Securities, Available-for-sale		168,056	24,116
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Debt Securities, Available-for-sale		290,175	233,629
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Debt Securities, Available-for-sale		81,629	91,683
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale		555	807
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		488	488
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers
ASSETS
Debt Securities, Available-for-sale		1,064	1,056
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		58,246	61,081
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		41,632	58,104
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		133,705	187,399
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		92,081	134,064
Significant Other Observable Inputs (Level 2) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity Securities, FV-NI		0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Debt Securities, Available-for-sale			0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Available-for-sale		0	0
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		31,213	31,510
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure	[1]	$ 31,213	$ 31,510
[1]	The fair value of individually assessed collateral dependent loans is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.

Fair Value Measurements (Deta_2

Fair Value Measurements (Details 2) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
ASSETS
Debt Securities, Held-to-maturity		$ 805,529	$ 724,512
Held to Maturity, Fair Value, Total		820,430	752,177
Loans, net of allowance for credit losses (b)		9,139,142	9,279,474
Federal Home Loan Bank Stock		10,250	10,250
Bank Owned Life Insurance		241,365	200,525
LIABILITIES
Federal Home Loan Bank borrowings (f)		35,717	35,740
Long-term Debt	[1]	28,099	32,773
Long-term Debt, Fair Value	[1]	27,572	32,033
Subordinated Debt		49,720	49,696
Deposits [Member]
LIABILITIES
Time certificates of deposits (f)	[2]	10,725,479	10,042,541
Accrued Liabilities, Fair Value Disclosure	[2]	10,725,479	10,042,541
Time certificates of deposits (f)
LIABILITIES
Time certificates of deposits (f)	[1]	868,045	950,629
Accrued Liabilities, Fair Value Disclosure	[1]	871,056	955,598
Federal Home Loan Bank borrowings (f)
LIABILITIES
Federal Home Loan Bank borrowings (f)	[1]	35,717	35,740
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[1]	35,799	35,885
Junior subordinated debentures (g)
LIABILITIES
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	[3]	62,851	62,851
Accrued Liabilities, Fair Value Disclosure	[3]	68,052	70,238
Subordinated debentures (f)
LIABILITIES
Subordinated Debt	[1]	49,720	49,696
Accrued Liabilities, Fair Value Disclosure	[1]	47,027	46,486
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	0	0
Significant Other Observable Inputs (Level 2) | Deposits [Member]
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[2]	10,725,479	10,042,541
Significant Other Observable Inputs (Level 2) | Time certificates of deposits (f)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[1]	871,056	955,598
Significant Other Observable Inputs (Level 2) | Federal Home Loan Bank borrowings (f)
LIABILITIES
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[1]	35,799
Accrued Liabilities, Fair Value Disclosure	[1]		35,885
Significant Other Observable Inputs (Level 2) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	27,572	32,033
Significant Other Observable Inputs (Level 2) | Junior subordinated debentures (g)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[3]	68,052	70,238
Significant Unobservable Inputs (Level 3) | Long-term Debt [Member]
LIABILITIES
Long-term Debt, Fair Value	[1]	0	0
Significant Unobservable Inputs (Level 3) | Subordinated debentures (f)
LIABILITIES
Accrued Liabilities, Fair Value Disclosure	[1]	47,027	46,486
U.S. Treasury securities
ASSETS
Debt Securities, Held-to-maturity	[4]	4,014	4,017
Held to Maturity, Fair Value, Total	[4]	4,057	4,077
U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	4,057	4,077
Agency mortgage-backed securities
ASSETS
Debt Securities, Held-to-maturity	[4]	417,811	356,085
Held to Maturity, Fair Value, Total	[4]	426,628	374,121
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	426,628	374,121
Agency collateralized mortgage obligations
ASSETS
Debt Securities, Held-to-maturity	[4]	355,686	335,993
Held to Maturity, Fair Value, Total	[4]	361,002	344,119
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	361,002	344,119
Single issuer trust preferred securities issued by banks
ASSETS
Debt Securities, Held-to-maturity	[4]	1,500	1,500
Held to Maturity, Fair Value, Total	[4]	1,508	1,498
Single issuer trust preferred securities issued by banks | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	1,508	1,498
Small Business Administration Pooled Securities [Member]
ASSETS
Debt Securities, Held-to-maturity	[4]	26,518	26,917
Held to Maturity, Fair Value, Total	[4]	27,235	28,362
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Held to Maturity, Fair Value, Total	[4]	0	0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Held to Maturity, Fair Value, Total	[4]	27,235	28,362
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Held to Maturity, Fair Value, Total	[4]	0	0
Loans, net of allowance for credit losses (b)
ASSETS
Loans, net of allowance for credit losses (b)	[5]	9,107,929	9,247,964
Loans Receivable, Fair Value Disclosure	[5]	9,072,683	9,253,381
Loans, net of allowance for credit losses (b) | Significant Unobservable Inputs (Level 3)
ASSETS
Loans Receivable, Fair Value Disclosure	[5]	9,072,683	9,253,381
Investment in Federal Home Loan Bank Stock [Member]
ASSETS
Federal Home Loan Bank Stock	[6]	10,250	10,250
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	10,250	10,250
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	0	0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	10,250	10,250
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	0	0
Cash Surrender Value [Member]
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	241,365	200,525
Bank Owned Life Insurance	[7]	241,365	200,525
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	0	0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	241,365	200,525
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3)
ASSETS
Cash Surrender Value, Fair Value Disclosure	[7]	$ 0	$ 0
[1]	Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[2]	Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[3]	Fair value was determined based upon market prices of securities with similar terms and maturities.
[4]	The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.
[5]	Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis.
[6]	Federal Home Loan Bank stock has no quoted market value and is carried at cost; therefore the carrying amount approximates fair value.
[7]	Cash surrender value of life insurance policies is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value.

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Other noninterest income - ASC 606	$ 1,125	$ 1,212
Total noninterest income in scope of ASC 606	16,097	18,330
Total noninterest income out of scope of ASC 606	9,149	8,105
Noninterest Income	25,246	26,435
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,584	4,970
Credit Card, Merchant Discount [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,903	4,104
ATM Charge [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	625	639
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7,402	6,289
Investment Advisory, Retail Investment and Insurance Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	902	540
Merchant Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	320	393
Credit Card Income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 236	$ 183

Revenue Recognition Contract wi

Revenue Recognition Contract with Customer, Asset (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Investment Management Income Receivable	$ 4,826	$ 4,636

Comprehensive Income_Loss (Comp

Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax		$ (9,159)	$ 31,981
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax		2,576	(8,997)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(6,583)	22,984
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount		(10,361)	12,123
Change in fair value of securities available for sale, tax (expense) benefit		2,587	(2,776)
Change in fair value of securities available for sale, after tax amount		(7,774)	9,347
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	0
Change in fair value of securities available for sale, pre tax amount		(10,361)	12,123
Change in fair value of securities available for sale, tax (expense) benefit		2,587	(2,776)
Change in fair value of securities available for sale, after tax amount		(7,774)	9,347
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		(4,779)	33,567
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax		1,344	(9,443)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		(3,435)	24,124
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		4,380	1,586
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax		(1,232)	(446)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		3,148	1,140
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax		653	(1,389)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		(184)	391
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax		469	(998)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		442	245
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(124)	(69)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		318	176
Amortization of certain costs included in net periodic retirement costs, pre tax amount		44	69
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit		(12)	(19)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		32	50
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	[1]	1,139	(1,075)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	[1]	(320)	303
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	[1]	819	(772)
Total other comprehensive income, pre tax amount		(18,381)	43,029
Total other comprehensive income, tax (expense) benefit		4,843	(11,470)
Total other comprehensive income, after tax amount		(13,538)	31,559
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax		0	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax		$ 0	$ 0
[1]	The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K.

Comprehensive Income_Loss (Co_2

Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 40,695	$ 18,169
Net change in other comprehensive income (loss)	(13,538)	31,559
Ending Balance	27,157	49,728
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	13,255	4,398
Net change in other comprehensive income (loss)	(7,774)	9,347
Ending Balance	5,481	13,745
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	33,276	16,479
Net change in other comprehensive income (loss)	(6,583)	22,984
Ending Balance	26,693	39,463
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5,836)	(2,708)
Net change in other comprehensive income (loss)	819	(772)
Ending Balance	(5,017)	(3,480)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ (13,538)	$ 31,559

Commitments and contingencies F

Commitments and contingencies Financial Instruments with Off-Balance Sheet Risk (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]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 3,561,078	$ 3,301,692
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	20,385	20,686
Deferred standby letter of credit fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	169	164
Obligation to Repurchase Receivables Sold [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 261,713	$ 303,265

Commitments and contingencies T

Commitments and contingencies Textual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Gain (Loss) on Termination of Lease	$ 4,800
Cash Reserve Deposit Required and Made	$ 0	$ 0
Minimum [Member]
Lessee, Operating Lease, Renewal Term		1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term		10 years

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event $ / shares in Units, $ in Thousands	Apr. 22, 2021USD ($)$ / sharesshares
Subsequent Event [Line Items]
Business Combination, Cost of Acquired Entity, Purchase Price | $	$ 1,150,000
Business Combination, Increase in Acquirer Outstanding Shares	14,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares of Company Stock Issued for Each Share of Acquiree Stock	0.2750
Business Acquisition, Share Price | $ / shares	$ 79.57