Independent Bank (INDB) 10-K 26 Feb 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 24, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Annual Report	true
Entity File Number	1-9047
Entity Address, Address Line One	2036 Washington Street,
Document Transition Report	false
Entity Incorporation, State or Country Code	MA
Entity Registrant Name	Independent Bank Corp
City Area Code	(781)
Local Phone Number	878-6100
Entity Central Index Key	0000776901
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 2,184,109,691
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		33,018,461
Entity Address, City or Town	Hanover,
Entity Tax Identification Number	04-2870273
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02339
Documents Incorporated by Reference	Portions of the Registrant’s definitive proxy statement for its 2021 Annual Meeting of Shareholders are incorporated into Part III, Items 10-14 of this Annual Report on Form 10-K. The 2021 definitive proxy statement will be filed within 120 days of December 31, 2020.
Current Fiscal Year End Date	--12-31
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
NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	INDB
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 169,460	$ 114,686
Interest-earning deposits with banks	1,127,176	36,288
Securities
Equity Securities, FV-NI	22,107	21,261
Debt Securities, Available-for-sale	412,860	426,424
Held to maturity (fair value $752,177 and $753,263)	724,512	740,806
Total securities	1,162,317	1,190,670
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	58,104	33,307
Loans
Total loans	9,392,866	8,873,639
Less: allowance for credit losses	(113,392)	(67,740)
Net loans	9,279,474	8,805,899
Federal Home Loan Bank stock	10,250	14,424
Bank premises and equipment, net	116,393	123,674
Goodwill	506,206	506,206
Other intangible assets	23,107	29,286
Cash surrender value of life insurance policies	200,525	197,372
Other assets	551,289	343,353
Total assets	13,204,301	11,395,165
Deposits
Noninterest-bearing demand deposits	3,762,306	2,662,591
Savings and interest checking accounts	4,047,332	3,232,909
Money market	2,232,903	1,856,552
Time certificates of deposit of $100,000 and over	525,424	663,645
Other time certificates of deposits	425,205	731,670
Total deposits	10,993,170	9,147,367
Borrowings
Advances from Federal Home Loan Banks	35,740	115,748
Secured Debt	32,773	74,906
Junior Subordinated Notes	62,851	62,848
Subordinated debentures (less unamortized debt issuance costs of $304 and $399)	49,696	49,601
Total borrowings	181,060	303,103
Other liabilities	327,386	236,552
Total liabilities	11,501,616	9,687,022
Commitments and contingencies	0	0
Stockholders' Equity
Preferred stock, $0.01 par value; authorized: 1,000,000 shares, outstanding: none	$ 0	$ 0
Common Stock, Shares, Outstanding	32,965,692	34,377,388
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	135,205	147,184
Common stock, $0.01 par value; authorized: 75,000,000 shares, issued and outstanding: 32,965,692 shares at December 31, 2020 and 34,377,388 shares at December 31, 2019 (includes 135,205 and 147,184 shares of unvested participating restricted stock awards, respectively)	$ 328	$ 342
Value of shares held in rabbi trust at cost: 84,126 shares at December 31, 2020 and 143,820 shares at December 31, 2019	(3,066)	(4,735)
Compensation and Benefits Trust	3,066	4,735
Additional paid in capital	945,638	1,035,450
Retained earnings	716,024	654,182
Accumulated other comprehensive income, net of tax	40,695	18,169
Total stockholders' equity	1,702,685	1,708,143
Liabilities and Equity	13,204,301	11,395,165
Junior Subordinated Debt [Member]
Stockholders' Equity
Unamortized Debt Issuance Expense	(37)	(40)
Subordinated Debt [Member]
Stockholders' Equity
Unamortized Debt Issuance Expense	(304)	(399)
Long-term Debt [Member]
Stockholders' Equity
Unamortized Debt Issuance Expense	(40)	(94)
Commercial And Industrial [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	2,103,152	1,395,036
Total loans	2,103,152	1,395,036
Less: allowance for credit losses		(17,594)
Commercial Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	4,173,927	4,002,359
Total loans	4,173,927	4,002,359
Less: allowance for credit losses		(32,935)
Construction Loans [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	553,929	547,293
Total loans	553,929	547,293
Less: allowance for credit losses		(6,053)
Small Business [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	175,023	174,497
Total loans	175,023	174,497
Less: allowance for credit losses		(1,746)
Residential Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	1,296,183	1,590,569
Total loans	1,296,183	1,590,569
Less: allowance for credit losses		(3,440)
Home Equity 1st Position [Member] | Senior Lien [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	633,142	649,255
Home Equity Subordinate Position [Member] | Junior Lien [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	435,648	484,543
Consumer Portfolio Segment [Member]
Loans
Financing Receivable, before Allowance for Credit Loss	21,862	30,087
Total loans	21,862	30,087	[1]
Less: allowance for credit losses		$ (396)
Home Equity Loan [Member]
Loans
Total loans	$ 1,068,790
[1]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Time certificates of deposit least amount	$ 100,000	$ 100,000
Securities held to maturity, fair value	$ 752,177,000	$ 753,263,000
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 issued	32,965,692	34,377,388
Common stock, shares outstanding	32,965,692	34,377,388
Common stock, unvested restricted Stock awards	135,205	147,184
Shares held in rabbit trust at cost	84,126	143,820
Common Stock Outstanding
Common stock, shares outstanding	32,965,692	34,377,388
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 304,000	$ 399,000
Long-term Debt [Member]
Unamortized Debt Issuance Expense	$ 40,000	$ 94,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss on Contract Termination	$ 684,000	$ 0	$ 0
Operating Lease, Impairment Loss	4,163,000	0	0
Gain (Loss) on Sale of Other Investments	1,033,000	0	0
Interest income
Interest and fees on loans	369,836,000	411,460,000	294,293,000
Interest Income, Securities, Operating, Taxable	30,133,000	32,405,000	26,513,000
Nontaxable interest and dividends on securities	35,000	51,000	60,000
Interest on loans held for sale	1,218,000	891,000	159,000
Interest on federal funds sold and short-term investments	847,000	2,207,000	2,676,000
Total interest and dividend income	402,069,000	447,014,000	323,701,000
Interest expense
Interest on deposits	27,333,000	41,186,000	19,995,000
Interest on borrowings	7,008,000	12,693,000	5,541,000
Total interest expense	34,341,000	53,879,000	25,536,000
Net interest income	367,728,000	393,135,000	298,165,000
Provision for Loan and Lease Losses	52,500,000	6,000,000	4,775,000
Net interest income after provision for credit losses	315,228,000	387,135,000	293,390,000
Noninterest income
Deposit account fees	15,121,000	20,040,000	18,327,000
Interchange and ATM fees	15,834,000	22,152,000	18,916,000
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	29,432,000	28,719,000	26,155,000
Fees and Commission Mortgage Banking	18,948,000	11,454,000	4,071,000
Increase in cash surrender value of life insurance policies	5,362,000	5,013,000	4,060,000
Gain Realized on Life Insurance Policies	1,044,000	434,000	1,463,000
Derivative, Gain (Loss) on Derivative, Net	10,058,000	6,478,000	2,373,000
Other noninterest income	15,641,000	21,004,000	13,140,000
Total noninterest income	111,440,000	115,294,000	88,505,000
Noninterest expenses
Salaries and employee benefits	152,460,000	149,165,000	124,328,000
Occupancy and equipment expenses	37,050,000	33,207,000	27,098,000
Data processing & facilities management	6,265,000	6,516,000	5,125,000
FDIC assessment	2,522,000	1,394,000	2,774,000
Advertising expense	4,258,000	5,444,000	4,942,000
Consulting expense	5,987,000	5,448,000	3,891,000
Cost, Amortization	5,802,000	5,545,000	2,344,000
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	1,462,000	0
Merger and acquisition expense	0	26,433,000	11,168,000
Software Maintenance	7,264,000	5,511,000	4,202,000
Other noninterest expenses	46,344,000	44,196,000	40,097,000
Total noninterest expenses	273,832,000	284,321,000	225,969,000
Income before income taxes	152,836,000	218,108,000	155,926,000
Income tax benefit	31,669,000	52,933,000	34,304,000
Net Income	$ 121,167,000	$ 165,175,000	$ 121,622,000
Basic earnings per share (in dollars per share)	$ 3.64	$ 5.03	$ 4.41
Diluted earnings per share (in dollars per share)	$ 3.64	$ 5.03	$ 4.40
Weighted average common shares (basic) (in shares)	33,259,643	32,810,433	27,592,380
Common share equivalents (in shares)	25,646	45,801	61,428
Weighted average common shares (diluted) (in shares)	33,285,289	32,856,234	27,653,808
Retained Earnings
Noninterest expenses
Net Income	$ 121,167,000	$ 165,175,000	$ 121,622,000
Cash dividends declared (in dollars per share)	$ 1.84	$ 1.76	$ 1.52

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 121,167	$ 165,175	$ 121,622
Other comprehensive income (loss), net of tax
Net change in fair value of securities available for sale		8,857	10,345	(4,501)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		16,797	10,331	4,829
Net change in other comprehensive income for defined benefit postretirement plans	[1]	(3,128)	(1,334)	1,558
Total other comprehensive income		22,526	19,342	1,886
Total comprehensive income		$ 143,693	$ 184,517	$ 123,508
[1]	The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation Obligation	Additional Paid in Capital	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	[1]		$ 0							$ 831		$ (831)
Beginning balance at Dec. 31, 2017		$ 943,809			$ 273	$ (4,590)	$ 4,590	$ 479,430	$ 465,937		$ (1,831)
Beginning balance (in shares) at Dec. 31, 2017				27,450,190
Prior Period Reclassification Adjustment											(397)
Net income		121,622							$ 121,622
Other comprehensive income		1,886									1,886
Common Stock, Dividends, Per Share, Declared									$ 1.52
Common dividend declared		(42,051)							$ (42,051)
Common stock issued for acquisition		42,474			5			42,469
Common stock issued for acquisition (in shares)				528,353
Proceeds from exercise of stock options, net of cash paid		184						184
Proceeds from exercise of stock options (in shares)				23,195
Stock based compensation		4,225						4,225
Restricted stock awards issued, net of awards surrendered (in shares)				43,383
Restricted stock awards issued, net of awards surrendered		(1,371)			1			(1,372)
Stock Issued During Period, Shares, Other				35,287
Stock Issued During Period, Value, Other		2,712						2,712
Increase (Decrease) in Deferred Compensation						(128)	128
Ending balance (in shares) at Dec. 31, 2018				28,080,408
Ending balance at Dec. 31, 2018		1,073,490			279	(4,718)	4,718	527,648	546,736		(1,173)
Net income		165,175							$ 165,175
Other comprehensive income		19,342									19,342
Common Stock, Dividends, Per Share, Declared									$ 1.76
Common dividend declared		(57,729)							$ (57,729)
Common stock issued for acquisition		499,693			61			499,632
Common stock issued for acquisition (in shares)				6,166,010
Proceeds from exercise of stock options, net of cash paid		281			0			281
Proceeds from exercise of stock options (in shares)				14,646
Stock based compensation		4,403						4,403
Restricted stock awards issued, net of awards surrendered (in shares)				50,080
Restricted stock awards issued, net of awards surrendered		(1,463)			1			(1,464)
Stock Issued During Period, Shares, Other				66,244
Stock Issued During Period, Value, Other		4,951			1			4,950
Increase (Decrease) in Deferred Compensation		$ 0
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits						(17)	17
Ending balance (in shares) at Dec. 31, 2019		34,377,388		34,377,388
Ending balance at Dec. 31, 2019		$ 1,708,143			342	(4,735)	4,735	1,035,450	654,182		18,169
Net income		121,167							$ 121,167
Other comprehensive income		22,526									22,526
Common Stock, Dividends, Per Share, Declared									$ 1.84
Common dividend declared		(60,878)							$ (60,878)
Common stock issued for acquisition		0
Proceeds from exercise of stock options (in shares)				8,873
Stock based compensation		4,123						4,123
Restricted stock awards issued, net of awards surrendered (in shares)				47,182
Restricted stock awards issued, net of awards surrendered		(1,187)			1			(1,188)
Stock Issued During Period, Shares, Other				32,249
Stock Issued During Period, Value, Other		2,132						2,132
Stock Repurchased During Period, Shares				(1,500,000)
Increase (Decrease) in Deferred Compensation		$ 0
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits						1,669	(1,669)
Ending balance (in shares) at Dec. 31, 2020		32,965,692		32,965,692
Ending balance at Dec. 31, 2020		$ 1,702,685			328	$ (3,066)	$ 3,066	945,638	$ 716,024		$ 40,695
Stock Repurchased During Period, Value, as a result of Stock Options Exercised		197						197
Stock Repurchased During Period, Value		(95,091)			$ (15)			$ (95,076)
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)		(1,000)
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal), net of tax.		736
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method, net of tax.		$ 817
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	[2]		$ 1,553							$ 1,553
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[2]	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 Cash

Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Net income	$ 121,167,000	$ 165,175,000	$ 121,622,000
Depreciation, Depletion and Amortization, Nonproduction	27,262,000	19,439,000	15,629,000
Change In Unamortized Net Loan Costs And Premiums	(13,412,000)	(10,086,000)	365,000
Provision for credit losses	52,500,000	6,000,000	4,775,000
Deferred income tax expense	(17,506,000)	10,594,000	(4,497,000)
Equity Securities, FV-NI, Gain (Loss)	(528,000)	(1,566,000)	1,225,000
Gain (Loss) on Investments		1,462,000
Gain (Loss) on Disposition of Property Plant Equipment	372,000	(474,000)	(1,126,000)
Operating Lease, Impairment Loss	4,163,000	0	0
Loss on Derivative Instruments, Pretax	684,000	0	0
Net loss on other real estate owned and foreclosed assets	0	401,000	112,000
Sale Leaseback Transaction, Current Period Gain Recognized	(578,000)	(578,000)	(730,000)
Share-based Payment Arrangement, Noncash Expense	4,123,000	4,403,000	4,225,000
Life Insurance, Corporate or Bank Owned, Change in Value	(5,362,000)	(5,013,000)	(4,060,000)
Gain Realized on Life Insurance Policies	(1,044,000)	(434,000)	(1,463,000)
Operating Lease, Payments	(11,936,000)	(10,669,000)	0
Change in Fair Value on Loans Held for Sale	(1,296,000)	(822,000)	51,000
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI	(659,000)	(675,000)	(180,000)
Increase (Decrease) in Loans Held-for-sale	(23,501,000)	59,932,000	(1,714,000)
Increase (Decrease) in Other Operating Assets	(145,953,000)	(39,850,000)	503,000
Change in other liabilities	76,140,000	19,283,000	7,100,000
Total adjustments	(56,531,000)	51,347,000	20,215,000
Net cash provided by operating activities	64,636,000	216,522,000	141,837,000
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	0	1,461,000	5,752,000
Increase (Decrease) in Equity Securities, FV-NI	(803,000)	(711,000)	(6,315,000)
Proceeds from Sale of Debt Securities, Available-for-sale		45,863,000
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	108,893,000	51,104,000	82,418,000
Payments to Acquire Debt Securities, Available-for-sale	(84,156,000)	(68,677,000)	(78,990,000)
Proceeds from maturities and principal repayments of securities held to maturity	261,705,000	126,991,000	82,355,000
Payments to Acquire Held-to-maturity Securities	(244,718,000)	(59,967,000)	(195,538,000)
Net redemption (purchases) of Federal Home Loan Bank stock	4,174,000	18,896,000	(2,376,000)
Investments in low income housing projects	(17,858,000)	(10,052,000)	(3,434,000)
Purchases of life insurance policies	(164,000)	(163,000)	(164,000)
Proceeds from Life Insurance Policy	3,417,000	3,162,000	2,850,000
Payments for (Proceeds from) Loans and Leases	(511,526,000)	27,816,000	(258,633,000)
Net cash paid in business combinations	0	(105,264,000)	(6,906,000)
Payments to Acquire Property, Plant, and Equipment	(12,586,000)	(16,583,000)	(11,106,000)
Proceeds from Sale of Property, Plant, and Equipment	6,095,000	3,796,000	2,189,000
Payments on early termination of hedging relationship	(684,000)	0	0
Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans		2,488,000	387,000
Net cash provided by (used in) investing activities	(488,211,000)	20,160,000	(387,511,000)
Increase (Decrease) in Time Deposits	(444,276,000)	(45,272,000)	(1,430,000)
Increase (Decrease) in Other Deposits	2,290,489,000	(160,637,000)	280,017,000
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	(45,000,000)	(132,046,000)	67,046,000
Increase Decrease in Federal Home Loan Bank Advances Long Term	(35,000,000)	(25,000,000)	(2,475,000)
Net decrease in customer repurchase agreements			(21,503,000)
Proceeds from Lines of Credit	0	49,980,000	0
Repayments of Lines of Credit	0	(49,980,000)	0
Repayments of Long-term Debt	(42,187,000)
Proceeds from Issuance of Debt		74,867,000	0
RepaymentsOfJuniorSubordinatedDebt	0	(13,329,000)	0
Proceeds from Issuance of Subordinated Long-term Debt	0	49,526,000	0
Repayments of Subordinated Debt	0	(34,767,000)	0
Cash received from stock option exercises	197,000	281,000	184,000
Issuance Of Restricted Stock Awards, Net of Issuance Cost	(1,187,000)	(1,463,000)	(1,371,000)
Proceeds from shares issued under the direct stock purchase plan	2,132,000	4,951,000	2,712,000
Payments for Repurchase of Common Stock	(95,091,000)	0	0
Common dividends paid	(60,840,000)	(53,274,000)	(40,167,000)
Net cash provided by (used in) financing activities	1,569,237,000	(336,163,000)	283,013,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	1,145,662,000	(99,481,000)	37,339,000
Cash and cash equivalents at beginning of year	150,974,000	250,455,000	213,116,000
Cash and cash equivalents at end of period	1,296,636,000	150,974,000	250,455,000
Supplemental schedule of noncash investing and financing activities
Interest Paid, Excluding Capitalized Interest, Operating Activities	36,739,000	49,704,000	25,337,000
Income taxes	48,240,000	39,575,000	27,809,000
Capital commitment relating to Low Income Housing Project investments, noncash	32,477,000	36,543,000	2,833,000
Transfer of customer repurchase agreements to deposits noncash	0	0	141,176,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	8,646,000	14,951,000	0
Operating Lease, Right-of-Use Asset	49,700,000	56,600,000
Operating Lease, Liability	56,356,000	16,393,000
In conjunction with the Company's acquisitions, assets were acquired and liabilities were assumed as follows
Common stock issued for acquisition	0	499,693,000	42,474,000
Fair value of assets acquired, net of cash acquired	0	2,711,067,000	362,286,000
Fair value of liabilities assumed	$ 0	$ 2,106,110,000	$ 312,906,000

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Independent Bank Corp. (the "Company") is a bank holding company, the principal subsidiary of which is Rockland Trust Company ("Rockland Trust" or the "Bank"). Rockland Trust is a state-chartered commercial bank, which as of December 31, 2020, operates ninety-six full service and two limited service retail branches, sixteen commercial banking centers, ten investment management offices and eight mortgage lending centers located in Eastern Massachusetts, Greater Boston, the South Shore, the Cape and Islands, as well as in Worcester County and Rhode Island. Rockland Trust deposits are insured by the Federal Deposit Insurance Corporation, subject to regulatory limits. The Company’s primary source of income is from providing loans to individuals and small-to-medium sized businesses in its market area. Rockland Trust is a community-oriented commercial bank, and the community banking business is the Company's only reportable operating segment. Principles of Consolidation The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company would consolidate voting interest entities in which it has all, or at least a majority of, the voting interest. As defined in applicable accounting standards, variable interest entities ("VIEs") are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company also owns the common stock of various trusts which have issued trust preferred securities. These trusts are VIEs in which the Company is not the primary beneficiary and, therefore, are not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income. Reclassification Certain previously reported amounts have been reclassified to conform to the current year’s presentation. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for expected credit losses on loans held for investment, income taxes, valuation and allowance for expected credit losses on investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment. Significant Concentrations of Credit Risk The vast majority of the Bank’s lending activities are conducted in Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 25% of the Bank’s tier one capital. Loans originated by the Bank to lessors of nonresidential buildings represented 17.1% and 17.5% of the total loan portfolio at December 31, 2020 and 2019, respectively. Within this concentration category, the Company believes it is well diversified among collateral property types and tenant industries. Cash and Cash Equivalents For purposes of reporting cash flows, cash and cash equivalents may include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at banks, and federal funds sold. Generally, federal funds are sold for up to two week periods. Securities Investment securities are classified at the time of purchase as available for sale, held to maturity, trading, or equity. Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading and equity securities are recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as held to maturity and recorded at amortized cost. Securities not classified as held to maturity or trading are classified as available for sale and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Such gains and losses are recognized within non-interest income or non-interest expense within the consolidated statements of income. Accrued interest receivable balances are excluded from the amortized cost of held to maturity securities and the fair value of available for sale securities and are included within other assets on the Consolidated Balance Sheets. Management has elected not to measure an allowance for credit losses on these balances as the Company employs a timely write-off policy. It is the Company's policy that a security is placed on nonaccrual status at the time any principal or interest payments become 90 days delinquent, and interest earned but not collected for a security placed on non-accrual is reversed against interest income. Prior to the Company's adoption of the current expected credit loss ("CECL") standard, declines in the fair value of held to maturity and available for sale securities below their amortized cost deemed to be OTTI were written down to fair value as determined by a cash flow analysis. To the extent the estimated cash flows did not support the amortized cost, the deficiency was considered to be due to credit loss and recognized in earnings. Unless the Company intended to sell the security, or if it was more likely than not that the Company would be required to sell the debt security before its anticipated recovery, the remainder of the OTTI charge was considered to be due to other factors, such as liquidity or interest rates, and thus was not recognized in earnings, but rather through other comprehensive income, net of related tax. The Company evaluated individual securities that had fair values below cost for six months or longer, or for a shorter period of time if considered appropriate by management, to determine if the decline in fair value was other-than-temporary. Consideration was given to the obligor of the security, whether the security was guaranteed, whether there was a projected adverse change in cash flows, the liquidity of the security, the type of security, the capital position of security issuers, and payment history of the security, amongst other factors when evaluating such securities. Allowance for Credit Losses - Available for Sale Securities The Company's available for sale securities are carried at fair value and assessed for estimated credit losses in accordance with the current expected credit loss ("CECL") methodology. For available for sale securities in an unrealized loss position, management will first evaluate whether there is intent to sell, or if it is more likely than not that the Company will be required to sell a security prior to anticipated recovery of its amortized cost basis. If either of these criteria are met, the Company will record a write-down of the security's amortized cost basis to fair value through income. For those available for sale securities which do not meet the intent or requirement to sell criteria, management will evaluate whether the decline in fair value is a result of credit related matters or other factors. In performing this assessment, management considers the creditworthiness of the issuer including whether the security is guaranteed by the U.S. Federal Government or other government agency, the extent to which fair value is less than amortized cost, and changes in credit rating during the period, among other factors. If this assessment indicates the existence of credit losses, the security will be written down to fair value, as determined by a discounted cash flow analysis. To the extent the estimated cash flows do not support the amortized cost, the deficiency is considered to be due to credit loss and is recognized in earnings. Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when the uncollectibility of a security is confirmed, or when either of the aforementioned criteria surrounding intent or requirement to sell have been met. Allowance for Credit Losses - Held to Maturity Securities The Company measures expected credit losses on held to maturity securities on a collective basis by major security type in accordance with the CECL methodology. Management classifies the held to maturity portfolio into the following major security types: U.S. Government Agency, U.S. Treasury, Agency Mortgage-Backed Securities, Agency Collateralized Mortgage Obligations, Small Business Administration Pooled Securities, and Single Issuer Trust Preferred Securities. Securities in the Company's held to maturity portfolio are primarily guaranteed by either the U.S. Federal Government or other government sponsored agencies with a long history of no credit losses. As a result, management has determined these securities to have a zero loss expectation and therefore does not estimate an allowance for credit losses on these securities. Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes. The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments and forward sales commitments. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Upfront costs and fees related to items for which the fair value option is elected are recognized in earnings as incurred and are not deferred. Loans Held for Investment Loans that the Company has the intent and ability to hold until maturity or payoff are carried at amortized cost (net of the allowance for credit losses). Amortized cost is the principal amount outstanding, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. As a general rule, loans 90 days or more past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are 90 days or more past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans in a timely manner and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for credit losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the amortized cost of the loan to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring ("TDR"). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. 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. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring. Allowance for Credit Losses - Loans Held for Investment The allowance for credit losses is established based upon the Company's current estimate of expected lifetime credit losses on loans measured at amortized cost. Credit losses are charged against the allowance when management's assessments confirm that the Company will not collect the full amortized cost basis of a loan. Subsequent recoveries, if any, are credited to the allowance. Under the CECL methodology, the Company estimates credit losses for financial assets on a collective basis for loans sharing similar risk characteristics using a quantitative model combined with an assessment of certain qualitative factors designed to address forecast risk and model risk inherent in the quantitative model output. The quantitative model utilizes a factor based approach to estimate expected credit losses using Probability of Default ("PD"), Loss Given Default ("LGD") and Exposure at Default ("EAD"), which are derived from internal historical default and loss experience. The model estimates expected credit losses using loan level data over the estimated life of the exposure, considering the effect of prepayments. Economic forecasts are incorporated into the estimate over a reasonable and supportable forecast period, beyond which is a reversion to the Company's historical long-run average. Management has determined a reasonable and supportable period of 12 months, and a straight line reversion period of 6 months, to be appropriate for purposes of estimating expected credit losses. The qualitative risk factors impacting the expected risk of loss within the portfolio include the following: • Lending policies and procedures • Economic and business conditions • Nature and volume of loans • Changes in management • Changes in credit quality • Changes in loan review system • Changes to underlying collateral values • Concentrations of credit risk • Model imprecision • Other external factors Loans that do not share similar risk characteristics with any pools of assets are subject to individual evaluation and are removed from the collectively assessed pools to avoid double counting. For the loans that are individually evaluated, the Company uses either a discounted cash flow (“DCF”) approach or a fair value of collateral approach. The latter approach is used for loans deemed to be collateral dependent or when foreclosure is probable. Accrued interest receivable amounts are excluded from balances of loans held at amortized cost and are included within other assets on the consolidated balance sheet. Management has elected not to measure an allowance for credit losses on these amounts as the Company employs a timely write-off policy. Consistent with the Company's policy for nonaccrual loans, accrued interest receivable is typically written off when loans reach 90 days past due and are placed on nonaccrual status. In the ordinary course of business, the Company enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for credit losses. The reserve for unfunded lending commitments is included in other liabilities on the Consolidated Balance Sheets. Acquired Loans Prior to its adoption of CECL, and under legacy GAAP, the Company maintained a portfolio of acquired loans, which, at acquisition, were recorded at fair value with no carryover of the allowance for credit losses. Acquired loans were also reviewed to determine if the loan had evidence of deterioration in credit quality and also if it was probable, at acquisition, that all contractually required payments would not be collected. Loans meeting such criteria were deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", was accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans were not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired PCI loans were generally considered to be accruing loans because their interest income related to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", included estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. Under the CECL standard, the concept of PCI assets was effectively replaced with purchased credit deteriorated ("PCD") assets, the balances of which should be treated in a manner consistent with loans held for investment for purposes of estimating an allowance for credit losses. As a result, upon the Company's adoption of CECL on January 1, 2020, loan balances previously classified as PCI assets were re-classified as PCD assets and have been prospectively accounted for in accordance with the standard. Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes. The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments and forward sales commitments. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Upfront costs and fees related to items for which the fair value option is elected are recognized in earnings as incurred and are not deferred. Loans Loans are carried at the principal amounts outstanding, or fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. As a general rule, loans 90 days or more past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are 90 days or more past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring ("TDR"). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. 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. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring. Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Loans held for sale are generally sold with servicing rights released, however if rights are retained, servicing assets are recognized as separate assets. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income. Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan, and are recorded as income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income. The Company is also a party to certain instruments with off-balance-sheet risk including certain residential loans sold to investors with recourse. The Company's policy is to record such instruments when funded. Federal Home Loan Bank Stock The Company, as a member of the Federal Home Loan Bank ("FHLB") of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if impairment exists. The Company reviews recent public filings, rating agency analysis and other factors when making its determination. Bank Premises and Equipment Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years. Goodwill and Other Intangible Assets The Company adopted ASC Topic 350 "Intangibles - Goodwill and Other" Update No. 2017-04 on January 1, 2020, and as previously disclosed, there was no material impact to the financial statements. Goodwill represents the excess of the purchase price over the net fair value of acquired businesses. Goodwill is not amortized and is assigned to one reporting unit. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, a quantitative impairment test is performed to compare carrying value to the fair value of the reporting unit. If the carrying amount of the reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. Other intangible assets subject to amortization consist of core deposit intangibles, customer lists and market-based favorable or unfavorable lease positions at time of acquisition, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. 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. The range of useful lives is as follows: Core deposit intangibles 10 years Customer Lists 12 years Leases 3 - 30 years The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets. Impairment of Long-Lived Assets Other Than Goodwill The Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs an undiscounted cash flow analysis to determine if impairment exists. When impairment is determined to exist, the related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of are based on the estimated proceeds to be received, less costs of disposal. Cash Surrender Value of Life Insurance Policies Increases in the cash surrender va

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2020
Business Acquisition [Line Items]
ACQUISITIONS	ACQUISITIONS Blue Hills Bancorp, Inc. On April 1, 2019, the Company completed the acquisition of Blue Hills Bancorp, Inc., parent of Blue Hills Bank (collectively "BHB"). The transaction qualified as a tax-free reorganization for federal income tax purposes and provided a tax-free exchange to Blue Hills Bancorp, Inc. stockholders with respect to the common stock received in the merger. For each share of Blue Hills Bancorp, Inc. common stock, stockholders had the right to receive $5.25 in cash and 0.2308 shares of the Company's stock, with cash paid in lieu of fractional shares. Total consideration of $661.3 million consisted of 6,166,010 shares of the Company's common stock issued, as well as $161.6 million in cash, inclusive of cash in lieu of fractional shares. In addition to increasing its loan and deposit base, the acquisition enabled the Company to provide a deeper product set to BHB's customers, as well as benefit from increased operating synergies. The Company accounted for the BHB acquisition using the acquisition method pursuant to the Business Combinations Topic of the FASB ASC. Accordingly, the Company recorded pre-tax merger and acquisition expenses of $26.0 million during the twelve months ended December 31, 2019 related to the BHB acquisition. Additionally, the acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date. The Company used third party valuation specialists to assist in the determination of fair value at the acquisition date. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 56,331 Investments 196,937 Loans 2,073,714 Premises and equipment 24,253 Goodwill 250,101 Core deposit and other intangibles 19,870 Other assets 146,192 Total assets acquired 2,767,398 Liabilities Deposits 1,930,436 Borrowings 124,817 Other liabilities 50,857 Total liabilities assumed 2,106,110 Purchase price $ 661,288 Fair value adjustments to assets acquired and liabilities assumed are generally amortized using either an effective yield or straight-line basis over periods consistent with the average life, useful life and/or contractual term of the related assets and liabilities. Fair values of the major categories of assets acquired and liabilities assumed were determined as follows: Cash and Cash Equivalents The fair values of cash and cash equivalents approximate the respective carrying amounts because the instruments are payable on demand or have short-term maturities. Investments The fair values of securities were based on quoted market prices for comparable securities received from an independent, nationally-recognized, third party pricing service. Prices provided by the independent pricing service were based on recent trading activity and other observable information including, but not limited to, market interest rate curves, referenced credit spreads and estimated prepayment rates where applicable. Loans The loans acquired were recorded at fair value without a carryover of the allowance for credit losses. Fair value of the loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then applying a market-based discount rate to those cash flows. The $23.2 million discount on the loans acquired in this transaction was due to anticipated credit loss, as well as considerations for liquidity and market interest rates. In addition, the acquired loans were reviewed to determine if any loans would be deemed PCI, as determined by identifying evidence of deterioration of credit quality at the purchase date combined with an assumption that all contractually required payments will not be collected. The following is a summary of these PCI loans associated with the acquisition as of the date acquired: As of April 1, 2019 (Dollars in thousands) Contractually required principal and interest at acquisition $ 14,849 Contractual cash flows not expected to be collected (5,717) Expected cash flows at acquisition 9,132 Interest component of expected cash flows (1,464) Basis in PCI loans at acquisition - estimated fair value $ 7,668 Premises and Equipment The fair value of the premises, including land, buildings and improvements, was determined based upon appraisals by licensed real estate appraisers. The appraisals were based upon the best and highest use of the property with final values determined based upon an analysis of the cost, sales comparison and income capitalization approaches for each property appraised. Core Deposit Intangible The fair value of the core deposit intangible is derived by comparing the interest rate and servicing costs that the financial institution pays on the core deposit liability versus the current market rate for alternative sources of financing, while factoring in estimates over the remaining life and attrition rate of the deposit accounts. The intangible asset represents the stable and relatively low cost source of funds that the deposits and accompanying relationships provide the Company, when compared to alternative funding sources. Deposits The fair value of acquired savings and transaction deposit accounts was assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. The fair value of time deposits was determined based on the present value of the contractual cash flows over the remaining period to maturity using a market interest rate. Borrowings The fair values of borrowings were derived based upon the present value of the principal and interest payments using a current market discount rate. Selected Pro Forma Results The following summarizes the unaudited pro forma results of operations as if the Company acquired BHB on January 1, 2019 (2018 amounts represent combined results for the Company and BHB). The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the period presented, nor does it indicate future results for any other interim or full-year period. Year Ended December 31 2019 2018 (Dollars in thousands) Net interest income after provision for credit losses $ 408,918 $ 371,264 Net income $ 129,385 $ 146,178 Included from the pro forma net income for the twelve months ended December 31, 2019 are merger-related costs of $57.3 million, net of tax, recognized by each of the Company and BHB in the aggregate. These costs were primarily made up of severance, contract terminations due to the change in control, Employee stock ownership plan termination expenses, stock compensation and integration costs.

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES Trading Securities The Company had trading securities of $2.8 million and $2.2 million at December 31, 2020 and 2019, 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 $22.1 million and $21.3 million at December 31, 2020 and 2019, 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: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Net gains (losses) recognized during the period on equity securities $ 528 $ 1,566 (1,225) Less: net gains recognized during the period on equity securities sold during the period 14 18 874 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 514 $ 1,548 (2,099) 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) at the dates indicated: December 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ 22,476 $ 1,640 $ — $ — $ 24,116 $ 32,473 $ 642 $ — $ 33,115 Agency mortgage-backed securities 224,293 9,337 (1) — 233,629 243,548 3,456 (4) 247,000 Agency collateralized mortgage obligations 88,687 3,083 (87) — 91,683 87,305 1,225 (19) 88,511 State, county, and municipal securities 790 17 — — 807 1,377 19 — 1,396 Single issuer trust preferred securities issued by banks 489 — (1) — 488 488 5 — 493 Pooled trust preferred securities issued by banks and insurers 1,429 — (373) — 1,056 1,488 — (374) 1,114 Small business administration pooled securities 57,289 3,792 — — 61,081 54,024 771 — 54,795 Total available for sale securities $ 395,453 $ 17,869 $ (462) $ — $ 412,860 $ 420,703 $ 6,118 $ (397) $ 426,424 The Company did not record a provision for estimated credit losses on any available for sale securities for the year ended December 31, 2020. Excluded from the table above is accrued interest on available for sale securities of $1.2 million and $1.3 million at December 31, 2020 and 2019, 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 for the year ended December 31, 2020. No securities held by the Company were delinquent on contractual payments at December 31, 2020, nor were any securities placed on non-accrual status for the year then ended. 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 for the year ended December 31, 2020, and therefore no gains or losses were realized for the periods presented. The Company realized losses of $1.5 million on sales of securities available for sale for the year ended December 31, 2019. The following table shows the gross unrealized losses and fair value of the Company’s available for sale securities which are in an unrealized loss position, and for which the Company has not recorded a provision for credit losses for the year ended December 31, 2020. 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: December 31, 2020 Less than 12 months 12 months or longer Total # of Fair Value Unrealized Fair Unrealized Fair Value 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 and 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 year ended December 31, 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 December 31, 2020: • 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 issuers, including regulatory capital ratios of the issuers. • 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) at the dates indicated: December 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ — $ — $ — $ — $ — $ 12,874 $ 123 $ — $ 12,997 U.S. treasury securities 4,017 60 — — 4,077 4,032 21 — 4,053 Agency mortgage-backed securities 356,085 18,036 — — 374,121 397,414 8,445 (57) 405,802 Agency collateralized mortgage obligations 335,993 8,466 (340) — 344,119 293,662 4,501 (849) 297,314 Single issuer trust preferred securities issued by banks 1,500 — (2) — 1,498 1,500 — (10) 1,490 Small business administration pooled securities 26,917 1,445 — — 28,362 31,324 338 (55) 31,607 Total held to maturity securities $ 724,512 $ 28,007 $ (342) $ — $ 752,177 $ 740,806 $ 13,428 $ (971) $ 753,263 The Company did not record a provision for estimated credit losses on any held to maturity securities for the year ended December 31, 2020. Excluded from the table above is accrued interest on held to maturity securities of $1.5 million and $1.9 million at December 31, 2020 and 2019, respectively, which is included within other assets on the Consolidated Balance Sheet. Additionally, the Company did not record any write-offs of accrued interest income on held to maturity securities for the year ended December 31, 2020. No securities held by the Company were delinquent on contractual payments at December 31, 2020, nor were any securities placed on non-accrual status for the year then ended. 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 for the years ended December 31, 2020 and 2019, and therefore no gains or losses were realized for such periods. 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. At December 31, 2020, all held to maturity securities held by the Company were rated investment grade or higher. The actual maturities of certain 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 securities available for sale and securities held to maturity at December 31, 2020 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 $ 10,231 $ 12,475 $ 13,885 $ — $ — $ 22,476 $ 24,116 Agency mortgage-backed securities — — 74,048 76,441 29,265 31,458 120,980 125,730 224,293 233,629 Agency collateralized mortgage obligations — — — — — — 88,687 91,683 88,687 91,683 State, county, and municipal securities 600 601 — — 190 206 — — 790 807 Single issuer trust preferred securities issued by banks — — — — — — 489 488 489 488 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,429 1,056 1,429 1,056 Small business administration pooled securities — — — — — — 57,289 61,081 57,289 61,081 Total available for sale securities $ 600 $ 601 $ 84,049 $ 86,672 $ 41,930 $ 45,549 $ 268,874 $ 280,038 $ 395,453 $ 412,860 Held to maturity securities U.S. Treasury securities 1,999 2,023 2,018 2,054 — — — — 4,017 4,077 Agency mortgage-backed securities — — 2,472 2,588 75,240 78,169 278,373 293,364 356,085 374,121 Agency collateralized mortgage obligations — — — — — — 335,993 344,119 335,993 344,119 Single issuer trust preferred securities issued by banks — — — — 1,500 1,498 — — 1,500 1,498 Small business administration pooled securities — — — — — — 26,917 28,362 26,917 28,362 Total held to maturity securities 1,999 2,023 4,490 4,642 76,740 79,667 641,283 665,845 724,512 752,177 Total $ 2,599 $ 2,624 $ 88,539 $ 91,314 $ 118,670 $ 125,216 $ 910,157 $ 945,883 $ 1,119,965 $ 1,165,037 Included in the table above is $3.6 million of callable securities at December 31, 2020. The carrying value of securities pledged to secure public funds, trust deposits, repurchase agreements and for other purposes, as required or permitted by law, was $419.6 million and $375.5 million at December 31, 2020 and 2019, respectively. At December 31, 2020 and 2019, the Company had no investments in obligations of individual states, counties, or municipalities which exceeded 10% of stockholders’ equity. Under previous accounting guidance, the Company reviewed both available for sale and held to maturity securities for other-than-temporary-impairment ("OTTI"). However, in accordance with the newly adopted CECL standard, the Company now utilizes separate impairment models for held to maturity and available for sale securities for purposes of estimating credit losses. The following table shows the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company had not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2019: December 31, 2019 Less than 12 months 12 months or longer Total # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) Agency mortgage-backed securities 12 $ 34,009 $ (59) $ 243 $ (2) $ 34,252 $ (61) Agency collateralized mortgage obligations 17 48,476 (215) 37,382 (653) 85,858 (868) Single issuer trust preferred securities issued by banks and insurers 1 — — 1,490 (10) 1,490 (10) Pooled trust preferred securities issued by banks and insurers 1 — — 1,114 (374) 1,114 (374) Small business administration pooled securities 1 7,349 (55) — — 7,349 (55) Total temporarily impaired securities 32 $ 89,834 $ (329) $ 40,229 $ (1,039) $ 130,063 $ (1,368)

Credit Losses

Credit Losses	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
Allowance for Credit Losses	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 year ended December 31, 2020: Years Ended December 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 (1) (1,984) (13,048) (3,652) 495 9,828 7,012 212 (1,137) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs (2,309) (3,885) — (380) (105) (142) (1,625) (8,446) Recoveries 289 9 — 33 2 210 1,035 1,578 Provision for credit loss expense 7,447 28,661 2,996 3,201 687 9,085 423 52,500 Ending balance (3) $ 21,086 $ 45,009 $ 5,397 $ 5,095 $ 14,275 $ 22,060 $ 470 $ 113,392 (1) 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. (2) 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. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $36.0 million at December 31, 2020. The balance of allowance for credit losses of $113.4 million at December 31, 2020 represents an increase of $45.6 million, or 67.3%, from the implementation balance at January 1, 2020. The increase in the allowance was primarily driven by anticipated credit deterioration caused by the COVID-19 pandemic, which resulted in an elevated provision for credit losses of $52.5 million for the year ended December 31, 2020. 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. Accordingly, the forecast used by the model was adjusted to use a more severe outlook as compared to the baseline forecast that was used to calculate the opening balances on January 1, 2020 as a result of the uncertainty in the outlook due to the ongoing pandemic. Additionally, the provision for credit loss recognized for the year ended December 31, 2020 reflects increased reserve allocations to loan segments identified as having an elevated loss exposure associated with the COVID-19 pandemic. 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 collateral values associated with non-owner occupied real estate 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, one-to-four 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 one-to-four family residential properties. Residential mortgage loans also include loans to construct owner-occupied one-to-four 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 one-to-four 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 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 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 at December 31, 2020: 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 1,074,773 (1) $ 141,859 $ 97,908 $ 30,431 $ 19,426 $ 19,749 $ 631,049 $ 2,538 $ 2,017,733 Potential weakness 9,020 1,869 670 4,997 1,539 294 20,766 — 39,155 Definite weakness - loss unlikely 2,009 1,310 19,575 2,997 320 429 6,991 — 33,631 Partial loss probable 672 — — — 156 143 11,662 — 12,633 Definite loss — — — — — — — — — Total commercial and industrial $ 1,086,474 $ 145,038 $ 118,153 $ 38,425 $ 21,441 $ 20,615 $ 670,468 $ 2,538 $ 2,103,152 Commercial real estate Pass $ 1,054,345 $ 726,276 $ 480,725 $ 544,826 $ 372,542 $ 664,256 $ 19,085 $ 14,737 $ 3,876,792 Potential weakness 27,877 55,166 30,286 19,531 25,462 71,252 13,610 — 243,184 Definite weakness - loss unlikely 25,878 3,502 3,857 10,185 3,376 7,153 — — 53,951 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 1,108,100 $ 784,944 $ 514,868 $ 574,542 $ 401,380 $ 742,661 $ 32,695 $ 14,737 $ 4,173,927 Commercial construction Pass $ 255,679 $ 167,948 $ 30,706 $ 32,538 $ — $ 6,689 $ 31,705 $ 588 $ 525,853 Potential weakness 17,528 9,953 520 — — — 75 — 28,076 Definite weakness - loss unlikely — — — — — — — — — Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 273,207 $ 177,901 $ 31,226 $ 32,538 $ — $ 6,689 $ 31,780 $ 588 $ 553,929 Small business Pass $ 41,713 $ 27,751 $ 19,497 $ 13,411 $ 13,837 $ 19,624 $ 35,451 $ — $ 171,284 Potential weakness — 10 15 15 6 217 822 — 1,085 Definite weakness - loss unlikely 684 438 122 11 137 353 883 — 2,628 Partial loss probable — — — — — — 26 — 26 Definite loss — — — — — — — — — Total small business $ 42,397 $ 28,199 $ 19,634 $ 13,437 $ 13,980 $ 20,194 $ 37,182 $ — $ 175,023 Residential real estate Pass $ 219,595 $ 146,058 $ 160,422 $ 144,638 $ 215,568 $ 401,279 $ — $ — $ 1,287,560 Default — — 427 — 4,158 4,038 — — 8,623 Total residential real estate $ 219,595 $ 146,058 $ 160,849 $ 144,638 $ 219,726 $ 405,317 $ — $ — $ 1,296,183 Home equity Pass $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,360 $ 661,575 $ 4,663 $ 1,066,158 Default — — — — — 440 1,837 355 2,632 Total home equity $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,800 $ 663,412 $ 5,018 $ 1,068,790 Other consumer Pass $ 816 $ 398 $ 165 $ 665 $ 615 $ 6,749 $ 12,317 $ — $ 21,725 Default — — — 15 — 111 11 — 137 Total other consumer $ 816 $ 398 $ 165 $ 680 $ 615 $ 6,860 $ 12,328 $ — $ 21,862 Total $ 2,812,901 $ 1,341,947 $ 896,983 $ 857,830 $ 698,323 $ 1,314,136 $ 1,447,865 $ 22,881 $ 9,392,866 (1) Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are reported as commercial and industrial under the 2020 vintage year and as"Pass" because these loans are 100% guaranteed by the U.S. Government. Funded PPP loans outstanding totaled $791.9 million at December 31, 2020. 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: December 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 57.4 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 771 767 LTV (re-valued)(2)(3) 46.0 % 46.6 % (1) The average FICO scores at December 31, 2020 are based upon rescores from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for December 31, 2020 are based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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 December 31, 2020, the Company's estimated reserve for unfunded commitments amounted to $1.2 million. 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 amount of loans with active deferrals at December 31, 2020 was $173.6 million. The majority of these loans with active deferrals continue to be characterized as current loans. In accordance with regulatory guidance, these modifications were not considered to be troubled debt restructurings ("TDRs") if they were performing prior to December 31, 2019. Additionally, a majority of these loans were characterized as current and therefore were not impacting nonaccrual or delinquency totals at 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 at the dates indicated: Nonaccrual Balances December 31, 2020 December 31, 2019 With Allowance for Credit Losses Without Allowance for Credit Losses Total Total (Dollars in thousands) Commercial and industrial $ 3,804 $ 30,925 $ 34,729 $ 22,574 Commercial real estate 10,195 — 10,195 3,016 Small business 815 10 825 311 Residential real estate 10,935 4,593 15,528 13,360 Home equity 5,427 — 5,427 6,570 Other consumer 156 — 156 61 Total nonaccrual loans (1) $ 31,332 $ 35,528 $ 66,860 $ 45,892 (1) Included in these amounts are $22.2 million and $24.8 million of nonaccruing TDRs at December 31, 2020 and December 31, 2019, 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 for the years ended December 31, 2020 and December 31, 2019. 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 December 31, 2020, and in turn, all loan foreclosures in process as of December, 31, 2020 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: December 31, 2020 December 31, 2019 (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 $ 1,750 $ 3,294 The following tables show the age analysis of past due financing receivables at the dates indicated: December 31, 2020 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 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 December 31, 2019 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 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections. 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. Exclusive of loans modified under provisions of the CARES Act, 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 at the dates indicated: December 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 16,983 $ 19,599 TDRs on nonaccrual 22,209 24,766 Total TDRs $ 39,192 $ 44,365 Amount of specific reserves associated with TDRs n/a $ 855 Additional commitments to lend to a borrower who has been a party to a TDR $ 263 $ 63 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 for the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Year Ended December 31, 2020 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 8 $ 732 $ 732 Commercial real estate 10 2,865 2,865 Small business 10 752 728 Residential real estate 2 559 642 Total 30 $ 4,908 $ 4,967 Year Ended December 31, 2019 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 3 $ 268 $ 268 Commercial real estate 4 819 819 Small business 1 14 14 Residential real estate 3 967 1,009 Home equity 2 121 121 Total 13 $ 2,189 $ 2,231 Year Ended December 31, 2018 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial $ 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total $ 29 $ 38,898 $ 42,457 The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the periods indicated: Years Ended December 31 2020 2019 2018 Extended maturity $ 4,120 $ 1,565 $ 2,878 Adjusted interest rate 822 150 57 Combination rate and maturity — 441 38,812 Court ordered concession 25 75 710 Total $ 4,967 $ 2,231 $ 42,457

LOANS, ALLOWANCE FOR LOAN LOSSE

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	12 Months Ended
	Dec. 31, 2020
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY	As disclosed in Note 1 - " Summary of Significant Accounting Policies " and Note 4 - " Loans, Allowance for Credit Losses and Credit Quality ," the Company adopted the CECL standard, effective January 1, 2020. As required by disclosure guidance, the Company has included relevant disclosures and accounting policies from the prior year and prior to the adoption of CECL within this footnote, as it relates to loans and allowance for loan losses. Allowance for Loan Losses The allowance for loan losses was established based upon the level of estimated probable losses in prior loan portfolios. Loan losses were charged against the allowance when management believed the collectability of a loan balance was doubtful. Subsequent recoveries, if any, were credited to the allowance. The allowance for loan losses was allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasized loss factors derived from actual historical portfolio loss rates, which were combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Allowance amounts were determined based on an estimate of the historical average annual percentage rate of loan loss for each loan category, an estimate of the incurred loss emergence and confirmation period for each loan category, and certain qualitative risk factors considered in the computation of the allowance for loan losses. The qualitative risk factors that impacted the inherent risk of loss within the portfolio included the following: • National and local economic and business conditions • Level and trend of delinquencies • Level and trend of charge-offs and recoveries • Trends in volume and terms of loans • Risk selection, lending policy and underwriting standards • Experience and depth of management • Banking industry conditions and other external factors • Concentration risk The formula-based approach evaluated groups of loans with common characteristics, which consisted of similar loan types with similar terms and conditions, to determine the appropriate allocation within each portfolio section. This approach incorporated qualitative adjustments based upon management’s assessment of various market and portfolio specific risk factors into its formula-based estimate. Due to the imprecise nature of the loan loss estimation process and ever changing conditions, the qualitative risk attributes may not have been adequately captured amounts of incurred loss in the formula-based loan loss components used to determine the Bank’s analysis of the appropriateness of the allowance for loan losses. The Bank evaluated certain loans within the commercial and industrial, commercial real estate, commercial construction and small business portfolios individually for specific impairment. A loan was considered impaired when, based on current information and events, it was probable that the Bank would be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment included payment status, collateral value, contractual interest rates and the probability of collecting scheduled principal and interest payments when due. Loans that experienced insignificant payment delays and payment shortfalls generally were not classified as impaired. Loans were selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification, troubled debt restructuring or nonaccrual status. A specific allowance amount was allocated to an individual loan when such loan had been deemed impaired and when the amount of the probable loss was able to be estimated. Estimates of loss were determined by the present value of anticipated future cash flows, the loan’s observable fair market value, or the fair value of the collateral, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the recorded investment in a loan that exceeded the fair value of the collateral less costs to sell was charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount had been identified definitively as uncollectible. Large groups of small-balance homogeneous loans such as the residential real estate, residential construction, home equity and other consumer portfolios were collectively evaluated for impairment. As such, the Bank did not typically identify individual loans within these groupings as impaired loans for impairment evaluation and disclosure. However, the Bank evaluated all TDRs for impairment on an individual loan basis regardless of loan type. In the ordinary course of business, the Bank enters into commitments to extend credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded in the financial statements when they become payable. The credit risk associated with these commitments is evaluated in a manner similar to the allowance for loan losses. The reserve for unfunded lending commitments is included in other liabilities in the balance sheet. At December 31, 2019 and 2018, the reserve for unfunded loan commitments was $2.1 million and $1.3 million, respectively. The following table bifurcates the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis at December 31, 2019 and 2018: December 31, 2019 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs (244) (2,614) — (509) — (240) (1,598) (5,205) Recoveries 1,131 152 — 122 142 318 787 2,652 Provision (benefit) 947 3,027 895 377 79 (110) 785 6,000 Ending balance $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Ending balance: collectively evaluated for impairment $ 17,468 $ 32,887 $ 6,053 $ 1,738 $ 2,803 $ 5,420 $ 391 $ 66,760 Ending balance: individually evaluated for impairment $ 126 $ 48 $ — $ 8 $ 637 $ 156 $ 5 $ 980 Financing receivables ending balance: Collectively evaluated for impairment $ 1,370,580 $ 3,987,848 $ 547,293 $ 173,960 $ 1,571,848 $ 1,127,963 $ 29,663 $ 8,809,155 Individually evaluated for impairment 24,456 8,337 — 537 11,228 4,948 122 49,628 Purchased credit impaired loans — 6,174 — — 7,493 887 302 14,856 Total loans by group $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 1,590,569 $ 1,133,798 $ 30,087 $ 8,873,639 (1) December 31, 2018 Commercial Commercial Commercial Small Residential Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Charge-offs (355) (82) — (372) (148) (293) (1,347) (2,597) Recoveries 182 188 — 46 12 156 888 1,472 Provision (benefit) 2,677 811 (540) 505 533 355 434 4,775 Ending balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Ending balance: collectively evaluated for impairment $ 15,753 $ 32,333 $ 5,158 $ 1,755 $ 2,357 $ 5,444 $ 414 $ 63,214 Ending balance: individually evaluated for impairment $ 7 $ 37 $ — $ 1 $ 862 $ 164 $ 8 $ 1,079 Financing receivables ending balance: Collectively evaluated for impairment $ 1,064,800 $ 3,235,418 $ 365,165 $ 164,135 $ 906,959 $ 1,085,961 $ 15,901 $ 6,838,339 Individually evaluated for impairment 28,829 10,839 — 541 12,706 5,948 197 59,060 Purchase credit impaired loans — 4,991 — — 3,629 175 — 8,795 Total loans by group $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 923,294 $ 1,092,084 $ 16,098 $ 6,906,194 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million at December 31, 2019 and 2018. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance were $21.6 million and $15.2 million at December 31, 2019 and 2018 respectively. The Company's historical approach to loan portfolio segmentation by risk characteristics and monitoring of credit quality for commercial loans under previous accounting guidance was consistent with that applied under the newly adopted CECL standard. See Note 4 - "Loans, Allowance for Credit Losses and Credit Quality" for further discussion surrounding the Company's policies for loan segmentation and credit quality monitoring. The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio: December 31, 2019 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness - loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185 Impaired Loans Under previous accounting guidance, a loan was considered impaired when, based on current information and events, it was probable that the Company would be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment included payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experienced insignificant payment delays and payment shortfalls generally were not classified as impaired. Management determined the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. The table below sets forth information regarding the Company’s impaired loans. The information for average recorded investment and interest income recognized is reflective of the full period being presented and does not take into account the date at which a loan was deemed to be impaired. See information below as of the dates indicated: As of and For the Years Ended December 31 2019 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 23,786 $ 34,970 $ — $ 27,056 $ 136 Commercial real estate 6,213 12,101 — 12,595 523 Small business 469 484 — 471 22 Residential real estate 4,976 5,123 — 5,045 222 Home equity 3,764 3,893 — 3,869 184 Other consumer 34 34 — 41 3 Subtotal 39,242 56,605 — 49,077 1,090 With an allowance recorded Commercial and industrial 670 670 126 718 29 Commercial real estate 2,124 2,124 48 2,176 122 Small business 68 105 8 74 2 Residential real estate 6,252 7,163 637 6,326 239 Home equity 1,184 1,382 156 1,214 52 Other consumer 88 91 5 97 3 Subtotal 10,386 11,535 980 10,605 447 Total $ 49,628 $ 68,140 $ 980 $ 59,682 $ 1,537 2018 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 28,459 $ 35,913 $ — $ 31,117 $ 142 Commercial real estate 9,552 9,832 — 10,561 519 Small business 358 439 — 401 14 Residential real estate 4,518 4,686 — 4,597 212 Home equity 4,957 5,199 — 5,230 220 Other consumer 56 56 — 64 4 Subtotal 47,900 56,125 — 51,970 1,111 With an allowance recorded Commercial and industrial 370 370 7 385 19 Commercial real estate 1,287 1,287 37 1,311 74 Small business 183 223 1 225 13 Residential real estate 8,188 9,217 862 8,459 289 Home equity 991 1,149 164 1,018 43 Other consumer 141 143 8 154 5 Subtotal 11,160 12,389 1,079 11,552 443 Total $ 59,060 $ 68,514 $ 1,079 $ 63,522 $ 1,554 Acquired loans All acquired loans were recorded at fair value with no carryover of the allowance for loan losses. At acquisition, loans were also reviewed to determine if the loan had evidence of deterioration in credit quality and to review if it was probable, at acquisition, that all contractually required payments were not collected. Such loans were deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", was accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans were not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired PCI loans were generally considered to be accruing loans because their interest income related to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", included estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. The estimated cash flows expected to be collected was regularly re-assessed subsequent to acquisition. These re-assessments involved updates, as necessary, of the key assumptions and estimates used in the initial estimate of fair value. Generally speaking, expected cash flows were affected by: • Changes in the expected principal and interest payments over the estimated life - Changes in expected cash flows may be driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows resulting from loan modifications are included in the assessment of expected cash flows. • Change in prepayment assumptions - Prepayments affect the estimated life of the loans, which may change the amount of interest income expected to be collected. • Change in interest rate indices for variable rate loans - Expected future cash flows are based, as applicable, on the variable rates in effect at the time of the assessment of expected cash flows. A decrease in expected cash flows in subsequent periods were an indication that the loan was impaired which would have likely required the recognition of a charge-off against the allowance for loan losses or an establishment of a specific reserve. An increase in expected cash flows in subsequent periods served, first, to reduce any previously established specific reserve by the increase in the present value of cash flows expected to be collected. Any increase above the previously established specific reserve resulted in a recalculation of the amount of accretable yield for the loan. The adjustment of accretable yield due to an increase in expected cash flows was accounted for as a change in estimate. The additional cash flows expected to be collected were reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion was adjusted accordingly over the remaining life of the loans. A PCI loan may have been resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the event of a sale of the loan, a gain or loss on sale would have been recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. For PCI loans accounted for on an individual loan basis and resolved directly with the borrower, any amount received from resolution in excess of the carrying amount of the loan was recognized and reported within interest income. A refinancing or modification of a PCI loan accounted for individually was assessed to determine whether the modification represented a TDR. If the loan was considered to be a TDR, it would have been included in the total impaired loans reported by the Company. The loan would have continued to recognize interest income based upon the excess of cash flows expected to be collected over the carrying amount of the loan. Purchased Credit Impaired Loans Under previous accounting guidance, certain loans acquired by the Company may have shown evidence of deterioration of credit quality since origination at purchase date, and it was therefore deemed unlikely that the Company would be able to collect all contractually required payments. As such, these loans were deemed to be PCI loans and the carrying value and prospective income recognition were predicated upon future cash flows expected to be collected. The following table displays certain information pertaining to PCI loans at the date indicated: December 31, 2019 (Dollars in thousands) Outstanding balance $ 18,358 Carrying amount $ 14,856 The following table summarizes activity in the accretable yield for the PCI loan portfolio for the year ended December 31, 2019: 2019 (Dollars in thousands) Beginning balance $ 1,191 Acquisition 1,464 Accretion (1,751) Other change in expected cash flows (1) 803 Reclassification from nonaccretable difference for loans which have paid off (2) 227 Ending balance $ 1,934 (1) Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s). (2) Results in increased income during the period when a loan pays off at amount greater than originally expected.

BANK PREMISES AND EQUIPMENT

BANK PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
BANK PREMISES AND EQUIPMENT	BANK PREMISES AND EQUIPMENT Bank premises and equipment at December 31, were as follows: 2020 2019 Estimated (Dollars in thousands) (In years) Cost Land $ 32,450 $ 32,619 n/a Bank premises 63,544 62,455 5-40 Leasehold improvements 38,667 35,498 1-27 Furniture and equipment 81,815 77,705 2-12 Leased equipment — 10,644 7 Total cost 216,476 218,921 Accumulated depreciation (100,083) (95,247) Net bank premises and equipment $ 116,393 $ 123,674 Depreciation expense related to bank premises and equipment was $12.8 million, $11.4 million, and $9.1 million for the years ended December 31, 2020, 2019 and 2018, respectively, and is reflected in occupancy and equipment expenses. Depreciation expense relating to computer software is included within other noninterest expense.

GOODWILL AND IDENTIFIABLE INTAN

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31: 2020 2019 (Dollars in thousands) Balances not subject to amortization Goodwill $ 506,206 $ 506,206 Balances subject to amortization Core deposit intangibles 22,215 28,016 Other intangible assets 892 1,270 Total other intangible assets 23,107 29,286 Total goodwill and other intangible assets $ 529,313 $ 535,492 The changes in the carrying value of goodwill for the periods indicated were as follows: 2020 2019 (Dollars in thousands) Balance at beginning of year $ 506,206 $ 256,105 Acquisitions — 250,101 Balance at end of year $ 506,206 $ 506,206 The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated: December 31 2020 2019 Gross Accumulated Net Gross Accumulated Net (Dollars in thousands) Core deposit intangibles $ 38,620 $ (16,405) $ 22,215 $ 45,245 $ (17,229) $ 28,016 Other intangible assets 2,434 (1,542) 892 3,338 (2,068) 1,270 Total $ 41,054 $ (17,947) $ 23,107 $ 48,583 $ (19,297) $ 29,286 Amortization of intangible assets was $6.2 million, $6.8 million, and $2.7 million at December 31, 2020, 2019, and 2018, respectively. The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years: Year Amount (Dollars in thousands) 2021 $ 5,315 2022 $ 4,539 2023 $ 3,948 2024 $ 3,162 2025 $ 2,329 The original weighted average amortization period for intangible assets is 9.9 years.

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
DEPOSITS	DEPOSITS The following is a summary of the scheduled maturities of time deposits at December 31: 2020 2019 (Dollars in thousands) 1 year or less $ 789,237 83.0 % $ 1,097,407 78.6 % Over 1 year to 2 years 93,727 9.9 % 204,690 14.7 % Over 2 years to 3 years 36,739 3.9 % 55,615 4.0 % Over 3 years to 4 years 13,407 1.4 % 24,038 1.7 % Over 4 years to 5 years 17,519 1.8 % 13,565 1.0 % Total $ 950,629 100.0 % $ 1,395,315 100.0 % The amount of overdraft deposits that were reclassified to the loan category were $1.4 million and $5.0 million at December 31, 2020 and 2019, respectively. The Company had pledged assets as collateral covering certain deposits in the amount of $419.6 million and $323.1 million at December 31, 2020 and 2019, respectively.

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Federal Home Loan Bank Borrowings Advances payable to the Federal Home Loan Bank at December 31, 2020 and 2019 were as follows: 2020 2019 Weighted Weighted Average Average Total Contractual Total Contractual Outstanding Rate Outstanding Rate (Dollars in thousands) Stated Maturity 2020 $ — — % $ 104,976 1.79 % 2021 35,042 1.12 % 10,042 2.95 % Subtotal 35,042 1.12 % 115,018 1.89 % Amortizing advances 698 730 Total Federal Home Loan Bank Advances $ 35,740 $ 115,748 To manage the interest rate risk of these advances, the Company may enter into interest rate swap agreements which effectively fix the rate of the borrowing. Inclusive of the impact of these swap arrangements, the weighted average rate of the FHLB borrowings was 1.13% and 1.88% at December 31, 2020 and 2019, respectively. The Company’s FHLB advances are collateralized by a blanket pledge agreement on the Bank’s FHLB stock, certain qualified investment securities, deposits at the FHLB, residential mortgages, and by certain commercial real estate loans held in the Bank’s portfolio. The carrying value of the loans pledged as collateral for these borrowings totaled $2.1 billion and $2.5 billion at December 31, 2020 and 2019, respectively. The Bank’s unused remaining available borrowing capacity at the FHLB was approximately $1.4 billion and $1.6 billion at December 31, 2020 and 2019, respectively, inclusive of a $5.0 million line of credit. At December 31, 2020 and 2019, the Company had sufficient collateral at the FHLB to support its obligations and was in compliance with the FHLB's collateral pledging program. Short-Term Debt Excluding FHLB borrowings included in the table above, the Company had no short-term borrowings at December 31, 2020 and 2019. On March 28, 2019, the Company entered into a credit facility for a principal amount of $50.0 million senior unsecured revolving loan credit facility, bearing interest at an interest rate equal to the one-month LIBOR rate plus 1.15%. The Company used the proceeds of these borrowings for funding needs related to the second quarter closing of BHB. During the second quarter of 2019, the Company repaid in full the entire $50.0 million amount of the senior unsecured revolving loan. There was no interest expense on short-term borrowings for the year ended December 31, 2020. The interest expense on short-term borrowings was $104,000 and $248,000 for the years ended December 31, 2019, and 2018, respectively. The 2018 expense was primarily attributable to customer repurchase agreements, which were discontinued and transitioned to a deposit product offering in the fourth quarter of 2018. Long-Term Debt The following table summarizes long-term debt, net of debt issuances costs, at the dates indicated: December 31 2020 2019 (Dollars in thousands) Long term borrowings, net $ 32,773 $ 74,906 Junior subordinated debentures Capital Trust V 51,510 51,507 Central Trust I 5,258 5,258 Central Trust II 6,083 6,083 Subordinated debentures 49,696 49,601 Total long-term debt $ 145,320 $ 187,355 The interest expense on long-term debt was $5.4 million, $8.2 million, and $4.2 million for the years ended December 31, 2020, 2019, and 2018, respectively. Long-term borrowings: During the first quarter of 2019 the Company entered into a senior unsecured term loan credit facility of which $32.8 million and $75.0 million was outstanding at December 31, 2020 and 2019, respectively. Advances under the term loan facility bear interest at an interest rate equal to one-month LIBOR plus 1.25% (1.40% at December 31, 2020). This term loan facility is due and payable in full on March 28, 2022. Junior Subordinated Debentures : The junior subordinated debentures are issued to various trust subsidiaries of the Company. These trusts are considered to be variable interest entities for which the Company is not the primary beneficiary, and therefore the accounts of the trusts are not included in the Company’s consolidated financial statements. These trusts were formed for the purpose of issuing trust preferred securities, which were then sold in a private placement offering. The proceeds from the sale of the securities and the issuance of common stock by these trusts were invested in these Junior Subordinated Debentures issued by the Company. For regulatory purposes, bank holding companies are allowed to include trust preferred securities in Tier 1 capital up to a certain limit. Provisions in the Dodd-Frank Act generally exclude trust preferred securities from Tier 1 capital, however, holding companies with consolidated assets of less than $15 billion, such as the Company, are able to continue to include these instruments in Tier 1 capital, but no such securities issued in the future will count as Tier 1 capital. Information relating to these trust preferred securities is as follows: Trust Description of Capital Securities Capital Trust V $50.0 million due in 2037, interest at a variable rate of 3 month LIBOR plus 1.48% (1.70% at December 31, 2020),which, effective on January 17, 2017, has been converted to a fixed rate of 2.84% through the use of an interest rate swap. Central Trust I $5.1 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.44% (2.66% at December 31, 2020). These securities are callable quarterly, until maturity. Central Trust II $5.9 million due in 2037, bearing interest at a variable rate of 3 month LIBOR plus 1.65% (1.87% at December 31, 2020). These securities are callable quarterly, until maturity. All obligations under these trust preferred securities are unconditionally guaranteed by the Company. Subordinated Debentures : At December 31, 2020 and 2019 the Company held $50.0 million of outstanding subordinated debentures at the bank holding company. On March 14, 2019 the Company issued subordinated debentures with an aggregate principal amount of $50.0 million in a private placement transaction to institutional accredited investors. The subordinated debentures mature on March 15, 2029. However, with regulatory approval, the Company may redeem the subordinated debentures without penalty at any scheduled payment date on or after March 15, 2024 with 30 days notice. The subordinated debentures carry a fixed rate of interest of 4.75% through March 15, 2024, after which interest converts to a variable rate of the then current three-month LIBOR rate plus 219 basis points, or equivalent alternate rate. The following table sets forth the contractual maturities of long-term debt over the next five years: 2021 2022 2023 2024 2025 Thereafter Total (Dollars in thousands) Long term borrowings $ 18,750 $ 14,023 $ — $ — $ — $ — $ 32,773 Junior subordinated debentures Capital trust V — — — — — 51,547 51,547 Central trust I — — — — — 5,258 5,258 Central trust II — — — — — 6,083 6,083 Subordinated debentures — — — — — 50,000 50,000 Total (1) $ 18,750 $ 14,023 $ — $ — $ — $ 112,888 $ 145,661 (1) Amounts in this table are presented on a gross basis, and do not include the capitalized issuance costs as presented in the Company's Consolidated Balance Sheet.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	Earnings per share consisted of the following components for the years ended December 31: 2020 2019 2018 (Dollars in thousands, except per share data) Net income $ 121,167 $ 165,175 $ 121,622 Weighted Average Shares Basic shares 33,259,643 32,810,433 27,592,380 Effect of dilutive securities 25,646 45,801 61,428 Diluted shares 33,285,289 32,856,234 27,653,808 Net income per share Basic EPS $ 3.64 $ 5.03 $ 4.41 Effect of dilutive securities — — (0.01) Diluted EPS $ 3.64 $ 5.03 $ 4.40

STOCK BASED COMPENSATION

STOCK BASED COMPENSATION	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
STOCK BASED COMPENSATION	STOCK BASED COMPENSATION The Company's stock based plans include the Second Amended and Restated 2005 Employee Stock Plan (the "2005 Plan") and the 2018 Non-Employee Director Stock Plan (the "2018 Plan"), which have been approved by the Company’s Board of Directors and shareholders. The 2010 Non-Employee Director Stock Plan (the "2010 Plan") expired in May 2018, and as such the Company may only award shares from the 2005 Plan or the 2018 Plan. These shares may be awarded as either stock option awards or restricted stock awards from its pool of authorized but unissued shares. The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, granted through December 31, 2020: Authorized Awards Cumulatively Granted, Net of Total Authorized Stock Restricted 2005 Plan 1,650,000 387,258 863,861 1,251,119 398,881 2010 Plan 314,600 46,500 93,245 139,745 — (1) 2018 Plan 300,000 — 21,938 21,938 278,062 (1) (1) The Company may award up to a total of 300,000 shares from the 2018 Plan, inclusive of 174,855 shares that were Authorized but Unissued in the 2010 Plan, and were transferred from the 2010 Plan to the 2018 Plan. Due to this transfer, there are no available shares remaining to be issued from the 2010 Plan. The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Stock based compensation expense Restricted stock awards (1) $ 3,272 $ 3,679 $ 3,299 Directors’ fee expense (2) Stock options — 23 66 Restricted stock awards 851 701 860 Total stock based award expense $ 4,123 $ 4,403 $ 4,225 Related tax benefits recognized in earnings $ 1,159 $ 1,238 $ 1,188 (1) Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards. (2) Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense. The Company has standard form agreements used for stock option and restricted stock awards. The standard form agreements used for the Chief Executive Officer and all other Executive Officers have previously been disclosed in Securities and Exchange Commission filings and generally provide that: (1) any unvested options or unvested restricted stock vest upon a Change of Control; and, that (2) any stock options which vest pursuant to a Change of Control, which is an event described in Section 280G of the Internal Revenue Code of 1986, will be cashed out at the difference between the acquisition price and the exercise price of the stock option. Stock Options The fair value of each stock option grant is estimated on the date of the grant using the Black-Scholes option-pricing model with the following assumptions used for grants under the identified plans: • Expected volatility is based on the standard deviation of the historical volatility of the weekly adjusted closing price of the Company’s shares for a period equivalent to the expected life of the option. • Expected life represents the period of time that the option is expected to be outstanding, taking into account the contractual term, historical exercise/forfeiture behavior, and the vesting period, if any. • Expected dividend yield is an annualized rate calculated using the most recent dividend payment at time of grant and the Company’s average trailing twelve-month daily closing stock price. • The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for a period equivalent to the expected life of the option. • Forfeitures on stock compensation are recognized when they occur. For the years ended December 31, 2020 and 2019, there were no awards granted by the Company of nonqualified options to purchase shares of common stock. The following table presents the awards granted by the Company of nonqualified options to purchase shares of common stock for the periods presented: Year Ended December 31 2018 Date of grant 4/3/2018 Plan 2010 Options granted 5,000 Vesting period (beginning on the grant date) 21 months Expiration date 4/3/2028 Expected volatility 21.15 % Expected life (years) 5.5 Expected dividend yield 1.94 % Risk free interest rate 2.62 % Fair value per option $ 13.46 Under all of the Company’s stock based plans, the option exercise price is based upon the average of the high and low trading value of the stock on the date of grant. Stock option awards granted to date under all plans expire at various dates through 2028. The following table presents relevant information relating to the Company’s stock options for the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands, except per share data) Fair value of stock options vested based on grant date fair value $ 22 $ 21 $ 85 Intrinsic value of stock options exercised $ 404 $ 883 $ 1,525 Cash received from stock option exercises $ 279 $ 396 $ 1,024 Tax benefit realized on stock option exercises $ 114 $ 248 $ 429 Weighted average grant date fair value of options granted (per share) n/a n/a $ 13.46 The following table presents a summary of stock option award activity for the year ended December 31, 2020: Outstanding Nonvested Stock Option Weighted Weighted Aggregate Stock Weighted (Dollars in thousands, except per share data) Balance at January 1, 2020 38,500 $ 42.49 1,666 $ 13.46 Granted — — — — Exercised (10,000) 27.90 n/a n/a Vested n/a n/a (1,666) 13.46 Forfeited — — — — Expired — — — — Balance at December 31, 2020 28,500 (2) $ 47.61 3.99 years $ 704 — $ — Options outstanding, vested, and exercisable at December 31, 2020 28,500 (2) $ 47.61 3.99 years $ 704 (1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2020 of $72.33, which would have been received by in-the-money option holders had they all exercised their options as of that date. (2) Inclusive of 20,000 vested stock options outstanding to Directors. For the year ended December 31, 2020, all outstanding stock option awards are vested and there is no unrecognized compensation expense related to those options. Restricted Stock The Company grants both time-vested restricted stock awards as well as performance-based restricted stock awards. During the years ended December 31, 2020, 2019, and 2018 the Company made the following restricted stock award grants: Shares Granted Plan Fair Value (1) Vesting Period Time-vested 2020 2/27/2020 46,550 2005 $ 70.24 Ratably over 5 years from grant date 4/15/2020 880 2005 $ 70.02 Ratably over 5 years from grant date 5/27/2020 9,438 2018 $ 72.86 Immediately upon grant date 2019 2/21/2019 43,250 2005 $ 83.87 Ratably over 5 years from grant date 3/15/2019 600 2005 $ 79.55 Ratably over 5 years from grant date 4/1/2019 1,090 2005 $ 82.62 Ratably over 3 years from grant date 5/21/2019 6,500 2018 $ 77.08 Immediately upon grant date 2018 2/15/2018 39,950 2005 $ 71.75 Ratably over 5 years from grant date 2/27/2018 1,150 2005 $ 72.60 Ratably over 5 years from grant date 5/15/2018 530 2005 $ 74.00 Ratably over 5 years from grant date 5/22/2018 6,000 2018 $ 76.58 Immediately upon grant date 11/15/2018 560 2005 $ 77.78 Ratably over 5 years from grant date Performance-based 2/27/2020 17,100 2005 $ 70.24 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2023. 2/21/2019 15,900 2005 $ 83.87 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2022. 2/15/2018 16,300 2005 $ 71.75 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021. (1) The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards. The following table presents the fair value of restricted stock awards that vesting during the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Fair value of restricted stock awards upon vesting $ 5,580 $ 6,005 $ 6,277 The following table presents a summary of restricted stock award activity for the year ended December 31, 2020: Outstanding Restricted Stock Weighted Average (Dollars in thousands, except per share data) Balance at January 1, 2020 193,784 $ 67.45 Granted 73,968 70.55 Vested/released (75,197) 60.34 Forfeited (11,050) 70.69 Balance at December 31, 2020 181,505 (1) $ 71.46 Unrecognized compensation cost (inclusive of directors’ fees) $ 7,787 Weighted average remaining recognition period (years) 2.96 (1) Inclusive of 10,300 restricted stock awards outstanding to Directors.

BALANCE SHEET OFFSETTING

BALANCE SHEET OFFSETTING	12 Months Ended
	Dec. 31, 2020
Offsetting [Abstract]
Balance Sheet Offsetting Disclosure [Text Block]	BALANCE SHEET OFFSETTING The Company does not offset fair value amounts recognized for derivative instruments or repurchase agreements. 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. The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the dates indicated: Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2020 (Dollars in thousands) Derivative Assets Interest rate swaps $ 47,576 $ — $ 47,576 $ — $ — $ 47,576 Loan level derivatives 125,242 — 125,242 — — 125,242 Customer foreign exchange contracts 4,359 — 4,359 — — 4,359 $ 177,177 $ — $ 177,177 $ — $ — $ 177,177 Derivative Liabilities Interest rate swaps $ 1,261 $ — $ 1,261 $ — $ — $ 1,260 Loan level derivatives 125,232 — 125,232 — — 125,232 Customer foreign exchange contracts 4,349 — 4,349 — — 4,349 $ 130,842 $ — $ 130,842 $ — $ — $ 130,842 (1) Reflects offsetting derivative positions with the same counterparty. Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2019 (Dollars in thousands) Derivative Assets Interest rate swaps $ 23,140 $ — $ 23,140 $ 23,140 $ — $ — Loan level derivatives 52,374 — 52,374 1,742 — 50,632 Customer foreign exchange contracts 1,191 — 1,191 — — 1,191 $ 76,705 $ — $ 76,705 $ 24,882 $ — $ 51,823 Derivative Liabilities Interest rate swaps $ 197 $ — $ 197 $ — $ 197 $ — Loan level derivatives 52,369 — 52,369 24,882 25,296 2,191 Customer foreign exchange contracts 1,149 — 1,149 — — 1,149 $ 53,715 $ — $ 53,715 $ 24,882 $ 25,493 $ 3,340 (1) Reflects offsetting derivative positions with the same counterparty.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The provision for income taxes is comprised of the following components: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Current expense Federal $ 32,171 $ 27,980 $ 25,129 State 17,004 14,359 13,672 Total current expense 49,175 42,339 38,801 Deferred expense (benefit) Federal (10,872) 9,080 (3,080) State (6,634) 1,514 (1,417) Total deferred expense (benefit) (17,506) 10,594 (4,497) Total expense $ 31,669 $ 52,933 $ 34,304 The difference between the statutory federal income tax rate and the effective income tax rate reported for the last three years is detailed below: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Computed statutory federal income tax provision $ 32,096 21.00 % $ 45,803 21.00 % $ 32,744 21.00 % State taxes, net of federal tax benefit 8,147 5.33 % 12,262 5.63 % 9,633 6.18 % CARES Act - net operating loss carryback (4,809) (3.15) % — — % — — % Low Income Housing Project Investments (1,851) (1.21) % (1,696) (0.78) % (1,030) (0.66) % Increase in cash surrender value of life insurance (1,345) (0.88) % (1,144) (0.52) % (1,160) (0.74) % Stock-based compensation (1,067) (0.70) % (824) (0.38) % (885) (0.57) % Nontaxable interest, net (723) (0.47) % (757) (0.35) % (566) (0.36) % Change in valuation allowance — — % 17 0.01 % 49 0.03 % New Markets Tax Credits — — % (2,675) (1.23) % (3,960) (2.54) % Merger and other related costs (non-deductible) — — % 582 0.27 % 130 0.08 % Other, net 1,221 0.80 % 1,365 0.63 % (651) (0.42) % Total expense $ 31,669 20.72 % $ 52,933 24.28 % $ 34,304 22.00 % On March 27, 2020 the CARES Act was signed into law, allowing the Company to realize a $4.8 million discrete tax benefit. This discrete benefit was associated with revised net operating loss (NOL) carryback provisions. The difference in enacted tax rates between the year of carryback versus carryforward resulted in a benefit recognized in income during the period that included the enactment date. Accordingly, the discrete benefit was fully recognized during the first quarter of 2020. The tax-effected components of the net deferred tax asset at December 31 of the years presented were as follows: 2020 2019 (Dollars in thousands) Deferred tax assets Accrued expenses not deducted for tax purposes $ 13,804 $ 13,855 Allowance for credit losses 32,265 18,993 Employee and director equity compensation 1,548 1,708 Foreign Tax Credit Carryforward 89 — Loan basis difference fair value adjustment 4,791 6,804 Net operating loss carry-forward 226 2,546 Operating lease liability 15,846 16,393 Other 999 1,311 Gross deferred tax assets $ 69,568 $ 61,610 Valuation allowance (280) (187) Total deferred tax assets net of valuation allowance $ 69,288 $ 61,423 Deferred tax liabilities Core deposit and other intangibles $ 4,344 $ 5,802 Deferred loan fees, net 336 4,944 Derivatives fair value adjustment 13,036 6,461 Fixed assets 7,786 8,194 Goodwill 10,947 10,645 Net unrealized gain on securities available for sale 4,152 — Prepaid pension 3,404 3,487 Right of use asset 12,979 15,911 Other 1,573 3,965 Gross deferred tax liabilities $ 58,557 $ 59,409 Total net deferred tax asset $ 10,731 $ 2,014 Deferred tax assets are to be reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The realization of the tax benefit depends upon the existence of sufficient taxable income in future periods. At December 31, 2020, the Company had a foreign tax credit carryforward with a related deferred tax asset of $89,000 and net operating loss carryforwards with related deferred tax assets of $226,000, which if not utilized, will expire in 2026 and 2040, respectively. The Company believes that these deferred assets related to its carryforwards will not be fully realized and accordingly recorded a valuation allowance of $280,000 at December 31, 2020. The Company believes that it is more likely than not that the remaining deferred tax assets will be realized through future reversals of existing taxable temporary differences and by offsetting other future taxable income. Uncertainty in Income Taxes The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as in various states. The Company is subject to U.S. federal, state and local income tax examinations by tax authorities for the 2017 through 2019 tax years including any related income tax filings from its recent acquisitions. The Company believes that its income tax returns have been filed based upon applicable statutes, regulations and case law in effect at the time of filing, however, the Internal Revenue Service ("IRS") and /or state jurisdictions could disagree with the Company's interpretation upon examination. The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits: (Dollars in thousands) Balance at December 31, 2018 $ 215 Reduction of tax positions for prior years (127) Increase for current year tax positions 444 Balance at December 31, 2019 532 Reduction of tax positions for prior years (58) Balance at December 31, 2020 $ 474

LOW INCOME HOUSING PROJECT INVE

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments	12 Months Ended
	Dec. 31, 2020
Low Income Housing Project Investments [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 minimum of 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 December 31 of the years presented: 2020 2019 2018 (Dollars in thousands) Original investment value $ 128,752 $ 96,275 $ 50,232 Current recorded investment $ 97,435 $ 72,510 $ 33,681 Unfunded liability obligation $ 49,586 $ 34,967 $ 3,935 Tax credits and benefits earned during the year $ 9,404 $ 7,342 $ 5,407 Amortization of investments during the year (1) $ 7,552 $ 5,645 $ 4,377 Net income tax benefit recognized during the year $ 1,851 $ 1,696 $ 1,030

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Pension The Company maintains a multiemployer defined benefit pension plan (the "Pension Plan") administered by Pentegra Retirement Services (the "Fund" or "Pentegra Defined Benefit Plan for Financial Institutions"). The Fund does not segregate the assets or liabilities of all participating employers and accordingly, disclosure of plan assets, accumulated vested and nonvested benefits is not possible. Effective July 1, 2006, the Company froze the defined benefit plan by eliminating all future benefit accruals. In conjunction with the acquisition of Peoples Federal Bancshares, Inc., the parent of Peoples Federal Savings Bank ("Peoples") in 2015, the Company acquired the Peoples Federal Defined Benefit Pension Plan ("Peoples Plan"). The Peoples Plan was frozen at the date of acquisition and will be maintained in the same manner as the Pension Plan. The Peoples Plan is also administered by Pentegra Retirement Services under the same Fund as the Pension Plan. The Company’s participation in the Pension Plan and the Peoples Plan (the "Pension Plans") for the annual period ended December 31, 2020, is outlined in the table below. The "EIN/Pension Plan Number" column provides the Employer Identification Number ("EIN") and the three-digit plan number. The funding status of the Pension Plans is determined on the basis of the financial statements provided by the Fund using total plan assets and accumulated benefit obligation. The "FIP/RP Status Pending/Implemented" column indicates plans for which a financial improvement plan ("FIP") or a rehabilitation plan ("RP") is either pending or has been implemented. The "Expiration Date of Collective-Bargaining Agreement" column lists the expiration dates of any collective-bargaining agreement(s) to which the Pension Plans are subject. Financial information for the Fund is made available through the public Form 5500 which is available by April 15 th of the year following the plan year end. Funding Status FIP/RP Status Surcharge Expiration Minimum EIN/Pension 2020 2019 Pentegra defined benefit plan for financial institutions 13-5645888/333 At least 80 percent At least 80 percent No No N/A $ — Contributions to the Fund are based on each individual employer’s experience. The Company bears the market risk relating to the Pension Plan and will continue to fund the Pension Plan as required. The Pension Plan year is July 1 through June 30. The Company’s total contributions to the Pension Plan did not represent more than 5% of the total contributions to the Pension Plan as indicated in the Pension Plan’s most recently available annual report dated June 30, 2020. The comparability of employer contributions is impacted by asset performance, discount rates and the reduction in the number of covered employees year over year. The Company’s contributions to the Pension Plans were as follows for the periods indicated: Required Contributions - Plan Year Allocation Cash Payment Future period funding 2020-2021 2019-2020 2018-2019 (Dollars in thousands) 2020 $ 929 $ — $ 929 $ — $ — 2019 $ 2,063 $ — $ — $ 2,063 $ — 2018 $ 2,642 $ 2,000 $ — $ — $ 642 In conjunction with the acquisition of BHB in 2019, the Company acquired the Savings Banks Employees Retirement Association Pension Plan as adopted by BHB (the "BHB Plan"). The BHB Plan is administered by Savings Banks Employees Retirement Association (SBERA) and was frozen on October 31, 2014. Accumulated benefits for participants earned through the end of October 2014 remain secured by the BHB Plan assets as of December 31, 2020 and 2019. Information pertaining to the BHB Plan is as follows: Years Ended December 31 2020 2019 (Dollars in thousands) Change in plan assets: Fair value of plan assets at beginning of year $ 11,653 $ 9,697 Actual return on plan assets 1,333 1,886 Employer contribution — 505 Benefits paid (761) (435) Settlement payments — — Fair value of plan assets at end of year $ 12,225 $ 11,653 Change in benefit obligation: Benefit obligation at beginning of year 13,687 10,824 Interest cost 416 424 Actuarial loss 1,710 2,874 Benefits paid (761) (435) Settlement payments — — Benefit obligation at end of year $ 15,052 $ 13,687 Funded status and accrued liability at end of year $ (2,827) $ (2,034) Accumulated benefit obligation at end of year $ 15,052 $ 13,687 At December 31, 2020 and 2019, the discount rate used to determine the benefit obligation was 2.35% and 3.11%, respectively. The components of net period pension cost (benefit) are as follows: Years Ended December 31 2020 2019 (Dollars in thousands) Interest cost $ 416 $ 424 Expected return on plan assets (908) (780) Amortization of net actuarial loss 541 327 Settlement loss 176 — Net period pension cost (benefit) $ 225 $ (29) The discount rate used to determine net periodic pension cost for the years ended December 31, 2020 and 2019 was 3.11% and 4.03%, respectively. The expected long-term rate of return on plan assets used to determine the net periodic pension cost for the years ended December 31, 2020 and 2019 was 8.00%. Assumptions with respect to the expected long-term rate of return are based on prevailing yields on high-quality, fixed-income investments increased by a premium for equity return expectations. SBERA offers a common and collective trust as the underlying investment structure for pension plans participating in SBERA. The target allocation mix for the common and collective trust portfolio calls for an equity-based investment range from 47% to 61% of total portfolio assets. The remainder of the portfolio is allocated to fixed income securities with a target range of 24% to 38% and other investments including global asset allocation and hedge funds from 9% to 21%. The Trustees of SBERA, through the Association's Investment Committee ("AIC"), select investment managers for the common and collective trust portfolio. A professional investment advisory firm is retained by the AIC to provide allocation analysis, performance measurement and to assist with manager searches. The overall investment objective is to diversify equity investments across a spectrum of investment types to limit risks from large market swings. The fair value of major categories of the BHB Plan assets are summarized below: Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2020 (Dollars in thousands) Collective funds $ 1,300 1,300 $ — $ — Equity securities 3,239 3,239 — — Mutual funds 1,506 1,506 — — Total investments in the fair value hierarchy $ 6,045 $ 6,045 $ — $ — Investments measured at net asset value (1) 6,180 $ 12,225 Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2019 (Dollars in thousands) Collective funds $ 967 967 $ — $ — Equity securities 1,131 1,131 — — Mutual funds 3,628 3,628 — — Total investments in the fair value hierarchy $ 5,726 $ 5,726 $ — $ — Investments measured at net asset value (1) 5,927 $ 11,653 (1) Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. There were no transfers to or from Level 1, 2 and 3 during the years ended December 31, 2020 and 2019. The fair value hierarchy above was received from SBERA, the plan administrator. The BHB Plan assets measured at fair value in Level 1 are based on quoted market prices in an active exchange market. BHB Plan assets measured at fair value in Level 2, as applicable, are based on pricing models that consider standard input factors such as observable market data, benchmark yields, interest rate volatilities, broker/dealer quotes, credit spreads and new issue data. BHB Plan assets measured at fair value in Level 3, as applicable, are based on unobservable inputs, which include the SBERA’s assumptions and the best information available under the circumstance. Estimated future benefit payments for the BHB Plan are presented below: Amount (Dollars in thousands) 2021 $ 843 2022 $ 628 2023 $ 635 2024 $ 566 2025 $ 567 2026-2030 $ 2,837 The Company’s total defined benefit plan expense was $1.9 million, $1.4 million, and $1.1 million, for the years ending December 31, 2020, 2019, and 2018, respectively. Postretirement Benefit Plans Employees retiring from the Bank after attaining age 65, who have rendered at least 10 years of continuous full time service with Rockland Trust are entitled to a fixed contribution toward the premium for postretirement health care benefits and a $5,000 benefit paid upon death. The health care benefits are subject to deductibles, co-payment provisions and other limitations. The Bank may amend or change these benefits periodically. Additionally, the Company has acquired small postretirement plans and/or agreements in conjunction with various acquisitions. The expense related to these plans for the years ending December 31, 2020, 2019, and 2018 was not material. Supplemental Executive Retirement Plans The Bank maintains frozen defined benefit supplemental executive retirement plans ("SERP") for certain highly compensated employees designed to offset the impact of regulatory limits on benefits under qualified pension plans. The Bank also maintains defined benefit SERPs acquired from previous acquisitions. The Bank has established and funded rabbi trusts to accumulate funds in order to satisfy the contractual liability of these supplemental retirement plan benefits. These agreements provide for the Bank to pay all benefits from its general assets, and the establishment of these trust funds does not reduce nor otherwise affect the Bank’s continuing liability to pay benefits from such assets except that the Bank’s liability shall be offset by actual benefit payments made from the trusts. The related trust assets included in the Company's available for sale securities portfolio totaled $19.1 million and $18.3 million at December 31, 2020 and 2019, respectively. The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plans which were used only to pay the current year benefits for the years indicated: 2020 2019 2018 (Dollars in thousands) Retirement expense $ 1,770 $ 1,356 $ 1,683 Contributions paid $ 475 $ 486 $ 434 Expected future benefit payments for the defined benefit supplemental executive retirement plans are presented below: Defined Benefit Supplemental Executive (Dollars in thousands) 2021 $ 472 2022 $ 464 2023 $ 576 2024 $ 1,224 2025 $ 1,214 2026-2030 $ 5,921 The measurement date used to determine the defined benefit supplemental executive retirement plans' benefits is December 31 for each of the years reported. The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented: Defined Benefit Supplemental Executive 2020 2019 2018 (Dollars in thousands) Change in accumulated benefit obligation Benefit obligation at beginning of year $ 17,361 $ 14,963 $ 15,749 Service cost 505 433 459 Interest cost 518 601 533 Actuarial loss (gain) 2,843 1,850 (1,344) Benefits paid (475) (486) (434) Benefit obligation at end of year $ 20,752 $ 17,361 $ 14,963 Change in plan assets Fair value of plan assets at beginning of year $ — $ — $ — Employer contribution 475 486 434 Benefits paid (475) (486) (434) Fair value of plan assets at end of year $ — $ — $ — Funded status at end of year $ (20,752) $ (17,361) $ (14,963) Assets — — — Liabilities (20,752) (17,361) (14,963) Funded status at end of year $ (20,752) $ (17,361) $ (14,963) Amounts recognized in accumulated other comprehensive income ("AOCI") Net loss $ 5,881 $ 3,509 $ 1,705 Prior service cost 218 494 770 Amounts recognized in AOCI $ 6,099 $ 4,003 $ 2,475 Information for plans with an accumulated benefit obligation in excess of plan assets Projected benefit obligation $ 20,752 $ 17,361 $ 14,963 Accumulated benefit obligation $ 20,752 $ 17,361 $ 14,963 Net periodic benefit cost Service cost $ 505 $ 433 $ 459 Interest cost 518 601 533 Amortization of prior service cost 276 276 276 Recognized net actuarial loss 471 46 415 Net periodic benefit cost $ 1,770 $ 1,356 $ 1,683 Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year Net actuarial loss $ 471 $ 471 $ 41 Net prior service cost $ 276 $ 276 $ 276 Discount rate used for benefit obligation 0.43 - 2.18% 2.00 - 3.04% 3.24 - 4.09% Discount rate used for net periodic benefit cost 2.00 - 3.04% 3.24 - 4.09% 2.48 - 3.45% Rate of compensation increase n/a n/a n/a Other Employee Benefits The Bank may choose to create an incentive compensation plan for senior management and other officers to participate in at varying levels. In addition, the Bank may also pay a discretionary bonus to senior management, officers, and/or non-officers of the Bank. The expense for the incentive plans and the discretionary bonus amounted to $11.0 million, $16.3 million and $13.8 million in 2020, 2019 and 2018, respectively. The Bank has an Employee Savings Plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under the Employee Savings Plan, participating employees may defer a portion of their earnings, not to exceed the Internal Revenue Service annual contribution limits. The Bank matches 25% of each employee’s contributions up to the first 6% of the employee’s eligible earnings. The 401(k) Plan incorporates an Employee Stock Ownership Plan for contributions invested in the Company’s common stock. The Company also provides three defined contributions under this Plan, providing the employees are deemed eligible. To be eligible for these contributions, an employee must complete one year and 1,000 hours of service. The defined contributions are made up of a safe harbor contribution, in which eligible employees receive a 3% cash contribution of eligible earnings to the social security limit, a discretionary contribution in which eligible employees receive a 2% cash contribution of eligible earnings up to the social security limit and a 5% cash contribution of eligible earnings over the social security limit up to the maximum amount permitted by law. Benefits contributed to employees under this defined contribution plan vest immediately. The defined contribution plan expense was $7.2 million, $6.6 million and $5.4 million for the years ended December 2020, 2019 and 2018, respectively. The Company has a non-qualified deferred compensation plan which allows for deferrals of base salary and incentive payments until an elected distribution date in the future. This deferred compensation plan is available to certain highly compensated employees. Deferrals are invested at the election of the participant into one of the actively managed funds made available to the participant through the Company's Investment Management Group. The funds are held in a rabbi trust until the elected date of distribution. The Company has a non-qualified 401(k) Restoration Plan ("Restoration Plan") for certain executive officers. The Restoration Plan is intended to contribute to each participant the amount of matching and discretionary contributions which would have been made to the existing Rockland Trust 401(k) plan on the participant's behalf, but were prohibited due to Internal Revenue Code limitations. Deferrals are invested at the election of the participant into one of the actively managed funds made available to the participant through the Company's Investment Management Group or in the Company's stock. These funds are held in a rabbi trust until the elected date of distribution. The Company recognized expense of $400,000, $356,000 and $278,000 related to this plan for services performed for the years ended December 31, 2020, 2019 and 2018, respectively. Also as part of the Peoples acquisition in 2015, the Company assumed various Salary Continuation Agreements with certain current and former senior executives. The agreements require the payment of specified benefits upon retirement over periods of ten or twenty years as described in each agreement. Expense related to the Salary Continuation Agreements was $207,000, $295,000 and $287,000 for the years ended December 31, 2020, 2019 and 2018, respectively. The Company also assumed a Peoples supplemental retirement plan with a former executive, whereby the amounts paid under this plan commenced upon the executive's retirement and continue until 2026. The expense related to the supplemental retirement plan for the years ended December 31, 2020, 2019 and 2018 was not material. Additionally, in conjunction with the acquisition of BHB in 2019, the Company assumed an Employee Stock Ownership Plan and a 401(k) retirement plan. These plans were terminated subsequent to the acquisition and both were fully liquidated during the year ended December 31, 2020. Director Benefits The Company maintains two deferred compensation plans for the Company’s Board of Directors which permit non-employee directors to defer cash fees, one of which was in effect through December 31, 2018 and a new plan which was adopted effective January 1, 2019. Under the plan in effect through December 31, 2018, deferred compensation is invested in Company stock and held by the Company's Investment Management Group. Under the plan that took effect January 1, 2019, participating directors may defer all or a portion of their cash compensation into a choice of diversified investment portfolios comprised of stocks, bonds and cash. The amount of compensation deferred during 2020, 2019, and 2018 was $101,000, $180,000, and $142,000, respectively.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2020
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 Company’s own assumptions are set to reflect those that market participants would use in pricing 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 to sell an asset or paid to transfer a liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. The Company uses prices and inputs that are current as of the measurement date. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition 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 were no changes in the valuation techniques used during the year ended December 31, 2020. 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 transaction, 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 volatilities. 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 derivatives 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 December 31, 2020 and 2019, 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 classified in 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, when applicable, 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 identified 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, and 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 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 Significant Other 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 $ 523,243 $ 1,056 Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans $ 31,510 $ — $ — $ 31,510 Total nonrecurring fair value measurements $ 31,510 $ — $ — $ 31,510 Fair Value Measurements at Reporting Date Using Balance Quoted Significant Other Significant December 31, 2019 (Dollars in thousands) Recurring fair value measurements Assets Trading securities $ 2,179 $ 2,179 $ — $ — Equity securities 21,261 21,261 — — Securities available for sale U.S. government agency securities 33,115 — 33,115 — Agency mortgage-backed securities 247,000 — 247,000 — Agency collateralized mortgage obligations 88,511 — 88,511 — State, county, and municipal securities 1,396 — 1,396 — Single issuer trust preferred securities issued by banks and insurers 493 — 493 — Pooled trust preferred securities issued by banks and insurers 1,114 — — 1,114 Small business administration pooled securities 54,795 — 54,795 — Loans held for sale 33,307 — 33,307 — Derivative instruments 78,385 — 78,385 — Liabilities Derivative instruments 53,923 — 53,923 — Total recurring fair value measurements $ 507,633 $ 23,440 $ 483,079 $ 1,114 Nonrecurring fair value measurements: Assets Collateral dependent impaired loans $ 25,515 $ — $ — $ 25,515 Total nonrecurring fair value measurements $ 25,515 $ — $ — $ 25,515 All assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were valued using pricing models and discounted cash flow methodologies, as of December 31, 2020, 2019 and 2018. This reconciliation is presented in the table below for the periods indicated: 2020 2019 2018 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,114 $ 1,329 $ 1,640 Gain and (losses) (realized/unrealized) Included in other comprehensive income — (26) 191 Settlements (58) (189) (502) Ending Balance $ 1,056 $ 1,114 $ 1,329 The following table sets forth certain unobservable inputs regarding the Company's financial instruments that are classified as Level 3 as of December 31st of the years indicated: Valuation Technique Fair Value Unobservable Inputs Range Weighted Average 2020 2019 2020 2019 2020 2019 (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,056 $ 1,114 Cumulative prepayment 0% - 55% 0% - 57% 2.4% 2.6% Cumulative default 4% - 100% 2% - 100% 11.8% 13.5% Loss given default 85% - 100% 85% - 100% 94.0% 93.6% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral (1) Individually assessed collateral dependent loans $ 31,510 n/a Collateral dependent impaired loans n/a $ 25,515 (1) Fair value 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 significant unobservable inputs used in the fair value measurement of the Company’s pooled trust preferred securities are cumulative prepayment rates, cumulative defaults, loss given defaults and cure given defaults. Significant increases (decreases) in deferrals or defaults, in isolation, would result in a significantly lower (higher) fair value measurement. Alternatively, significant increases (decreases) in cure rates, in isolation, would result in a significantly higher (lower) fair value measurement. 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 Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 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 Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Significant Other Significant December 31, 2019 Financial assets (Dollars in thousands) Securities held to maturity (a) U.S. government agency securities $ 12,874 $ 12,997 $ — $ 12,997 $ — U.S. Treasury securities 4,032 4,053 — 4,053 — Agency mortgage-backed securities 397,414 405,802 — 405,802 — Agency collateralized mortgage obligations 293,662 297,314 — 297,314 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 31,324 31,607 — 31,607 — Loans, net of allowance for loan losses (b) 8,780,384 8,613,635 — — 8,613,635 Federal Home Loan Bank stock (c) 14,424 14,424 — 14,424 — Cash surrender value of life insurance policies (d) 197,372 197,372 — 197,372 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 7,752,052 $ 7,752,052 $ — $ 7,752,052 $ — Time certificates of deposits (f) 1,395,315 1,396,760 — 1,396,760 — Federal Home Loan Bank borrowings (f) 115,748 115,881 — 115,881 — Long-term borrowings (f) 74,906 72,219 — 72,219 — Junior subordinated debentures (g) 62,848 65,603 — 65,603 — Subordinated debentures (f) 49,601 52,870 — — 52,870 (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 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 financial instruments' current use to be the highest and best use of the instruments.

REVENUE RECOGNITION (Notes)

REVENUE RECOGNITION (Notes)	12 Months Ended
	Dec. 31, 2020
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 for the periods indicated: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 15,121 $ 20,040 $ 18,327 Interchange fees 12,564 18,262 15,433 ATM fees 2,476 3,224 2,961 Investment management - wealth management and advisory services 27,157 25,940 23,441 Investment management - retail investments and insurance revenue 2,275 2,779 2,714 Merchant processing income 1,299 1,175 1,401 Credit card income 778 — — Other noninterest income 4,235 8,696 4,432 Total noninterest income in-scope of ASC 606 65,905 80,116 68,709 Total noninterest income out-of-scope of ASC 606 45,535 35,178 19,796 Total noninterest income $ 111,440 115,294 $ 88,505 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 the 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 in to 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: December 31, 2020 December 31, 2019 (Dollars in thousands) Receivables, included in other assets $ 4,636 $ 2,341 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 The Company earns fee income associated with various transactions related to foreign currency product offerings, including foreign currency bank notes and drafts and foreign currency wires. The majority of this income is derived from commissions earned related to customers executing the above mentioned foreign currency transactions through arrangements with third party correspondents.

OTHER COMPREHENSIVE LOSS

OTHER COMPREHENSIVE LOSS	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
OTHER COMPREHENSIVE LOSS	OTHER COMPREHENSIVE INCOME (LOSS) The following table presents 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): Year Ended December 31, 2020 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 11,686 $ (2,829) $ 8,857 Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale 11,686 (2,829) 8,857 Change in fair value of cash flow hedges 36,994 (10,406) 26,588 Less: net cash flow hedge gains reclassified into interest income or interest expense 14,306 (4,023) 10,283 Less: loss on termination of hedge reclassified into noninterest expense (684) 192 (492) Net change in fair value of cash flow hedges 23,372 (6,575) 16,797 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (5,785) 1,627 (4,158) Amortization of net actuarial losses 982 (276) 706 Amortization of net prior service costs 276 (78) 198 Amortization of net settlement costs 176 (50) 126 Net change in other comprehensive income for defined benefit postretirement plans (2) (4,351) 1,223 (3,128) Total other comprehensive income $ 30,707 $ (8,181) $ 22,526 Year Ended December 31, 2019 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 12,055 $ (2,761) $ 9,294 Less: net security losses reclassified into other noninterest expense (1,462) 411 (1,051) Net change in fair value of securities available for sale 13,517 (3,172) 10,345 Change in fair value of cash flow hedges 16,725 (4,708) 12,017 Less: net cash flow hedge gains reclassified into interest income or interest expense 2,346 (660) 1,686 Net change in fair value of cash flow hedges 14,379 (4,048) 10,331 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (2,123) 597 (1,526) Amortization of net actuarial gains (8) 2 (6) Amortization of net prior service costs 276 (78) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) (1,855) 521 (1,334) Total other comprehensive income $ 26,041 $ (6,699) $ 19,342 Year Ended December 31, 2018 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (5,923) $ 1,422 $ (4,501) Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale (5,923) 1,422 (4,501) Change in fair value of cash flow hedges 7,717 (2,169) 5,548 Less: net cash flow hedge gains reclassified into interest income or interest expense (1) 1,000 (281) 719 Net change in fair value of cash flow hedges 6,717 (1,888) 4,829 Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period 1,521 (428) 1,093 Amortization of net actuarial losses 372 (105) 267 Amortization of net prior service costs 276 (78) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) 2,169 (611) 1,558 Total other comprehensive income $ 2,963 $ (1,077) $ 1,886 (1) Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, was recognized in earnings through December 2018, the original maturity date of the swap. (2) The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans . Effective January 1, 2018, the Company elected to reclassify certain tax effects from accumulated other comprehensive income to retained earnings, related to items that were stranded in other comprehensive income as a result of the Tax Cuts and Jobs Act of 2017. A description of the other income tax effects that were reclassified as a result of the Tax Act are listed in the table below. Information on the Company's accumulated other comprehensive income (loss), net of tax, was comprised of the following components for the periods indicated: Unrealized Gain (Loss) on Securities Unrealized Gain (Loss) on Cash Flow Hedge Deferred Gain on Hedge Transactions Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in Thousands) Beginning balance: January 1, 2018 $ (504) $ 948 $ 137 $ (2,412) $ (1,831) Opening balance reclassification (111) 205 29 (520) (397) Cumulative effect accounting adjustment (831) — — — (831) Other comprehensive income (loss) (4,501) 4,995 (166) 1,558 1,886 Ending balance: December 31, 2018 $ (5,947) $ 6,148 $ — $ (1,374) $ (1,173) Other comprehensive income (loss) 10,345 10,331 — (1,334) 19,342 Ending balance: December 31, 2019 $ 4,398 $ 16,479 $ — $ (2,708) $ 18,169 Other comprehensive income (loss) 8,857 16,797 — (3,128) 22,526 Ending balance: December 31, 2020 $ 13,255 $ 33,276 $ — $ (5,836) $ 40,695

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	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, standby letters of credit, and loans sold 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. 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 other 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 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: As of December 31 2020 2019 (Dollars in thousands) Commitments to extend credit $ 3,301,692 $ 3,337,930 Standby letters of credit $ 20,686 $ 21,565 Deferred standby letter of credit fees $ 164 $ 158 Loan exposures with recourse $ 303,265 $ 404,532 Other Contingencies At December 31, 2020, Rockland Trust 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 December 31, 2020. There was also no reserve requirement balance necessary at December 31, 2019 due to cash balances held at the Federal Reserve that were in excess of reserve requirements.

REGULATORY CAPITAL REQUIREMENTS

REGULATORY CAPITAL REQUIREMENTS	12 Months Ended
	Dec. 31, 2020
Regulated Operations [Abstract]
REGULATORY CAPITAL REQUIREMENTS	REGULATORY MATTERS Regulatory Capital Requirements The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. At December 31, 2020 the most recent notification from the Federal Deposit Insurance Corporation indicated that the Bank's capital levels met or exceeded the minimum levels to be considered "well capitalized" for bank regulatory purposes. To be categorized as well capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based, Common equity Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since the notification that management believes have changed the Bank’s category. Management believes, as of December 31, 2020 and 2019, that the Company and the Bank met all capital adequacy requirements to which they are subject. The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2020 and 2019 are also presented in the table that follows: Actual For Capital To Be Well Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2020 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 1,374,349 15.13 % $ 726,482 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 1,150,177 12.67 % $ 408,646 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 1,211,177 13.34 % $ 544,861 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) leverage $ 1,211,177 9.56 % $ 506,805 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 1,320,056 14.54 % $ 726,313 ≥ 8.0 % $ 907,892 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 1,206,566 13.29 % $ 408,551 ≥ 4.5 % $ 590,130 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 1,206,566 13.29 % $ 544,735 ≥ 6.0 % $ 726,313 ≥ 8.0 % Tier 1 capital (to average assets) leverage $ 1,206,566 9.54 % $ 505,747 ≥ 4.0 % $ 632,184 ≥ 5.0 % December 31, 2019 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 1,352,341 14.83 % $ 729,291 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 1,171,963 12.86 % $ 410,226 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 1,232,963 13.53 % $ 546,969 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 1,232,963 11.28 % $ 437,271 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 1,275,611 14.00 % $ 728,868 ≥ 8.0 % $ 911,085 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 1,205,740 13.23 % $ 409,988 ≥ 4.5 % $ 592,205 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 1,205,740 13.23 % $ 546,651 ≥ 6.0 % $ 728,868 ≥ 8.0 % Tier 1 capital (to average assets) $ 1,205,740 11.06 % $ 435,886 ≥ 4.0 % $ 544,857 ≥ 5.0 % In addition to the minimum risk-based capital requirements outlined in the table above, the Company is required to maintain a minimum capital conservation buffer, in the form of common equity, in order to avoid restrictions on capital distributions and discretionary bonuses. The required amount of the capital conservation buffer is 2.5%. The Company's capital levels exceeded the minimum requirement plus the buffer of 2.5% as of December 31, 2020 and 2019. Dividend Restrictions The Company is subject to capital and dividend requirements administered by federal and state bank regulators, and the Company will not declare a cash dividend that would cause the Company to violate regulatory requirements. The Company is, in the ordinary course of business, dependent upon the receipt of cash dividends from the Bank to pay cash dividends to shareholders and satisfy the Company’s other cash needs. Federal and state law impose limits on capital distributions by the Bank. Massachusetts-chartered banks, such as the Bank, may declare from net profits cash dividends not more frequently than quarterly and non-cash dividends at any time. No dividends may be declared, credited, or paid if the Bank’s capital stock would be impaired. Massachusetts Bank Commissioner approval is required if the total of all dividends declared by the Bank in any calendar year would exceed the total of its net profits for that year combined with its retained net profits of the preceding two years, less any required transfer to surplus or a fund for the retirement of any preferred stock. Dividends paid by the Bank to the Company for the year ended December 31, 2020 and 2019 totaled $166.0 million and $181.7 million, respectively. Trust Preferred Securities

PARENT COMPANY FINANCIALS ONLY

PARENT COMPANY FINANCIALS ONLY	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
PARENT COMPANY FINANCIAL STATEMENTS	PARENT COMPANY FINANCIAL STATEMENTS Condensed financial information relative to the balance sheets of Independent Bank Corp., as the parent company, at December 31, 2020 and 2019 and the related statements of income and cash flows for the years ended December 31, 2020, 2019, and 2018 are presented below. The statement of stockholders’ equity is not presented below as the parent company’s stockholders’ equity is that of the consolidated Company. BALANCE SHEETS December 31 2020 2019 (Dollars in thousands) Assets Cash (1) $ 100,604 $ 135,688 Investments in subsidiaries (2) 1,761,383 1,743,435 Prepaid income taxes 1,927 31,586 Deferred tax asset 642 612 Derivative instruments (1) — 290 Total assets $ 1,864,556 $ 1,911,611 Liabilities and stockholders’ equity Dividends payable $ 15,164 $ 15,126 Long-term borrowings (less unamortized debt issuance costs of $40 and $94) 32,773 74,906 Junior subordinated debentures (less unamortized debt issuance costs of $37 and $40) 62,851 62,848 Subordinated debentures (less unamortized debt issuance costs of $304 and $399) 49,696 49,601 Derivative instruments (1) 569 — Other liabilities 818 987 Total liabilities 161,871 203,468 Stockholders’ equity 1,702,685 1,708,143 Total liabilities and stockholders’ equity $ 1,864,556 $ 1,911,611 (1) Entire balance eliminates in consolidation. (2) Majority of balance eliminates in consolidation. STATEMENTS OF INCOME Years Ended December 31 2020 2019 2018 (Dollars in thousands) Income Dividends received from subsidiaries (1) $ 166,033 $ 181,790 $ 71,255 Total income 166,033 181,790 71,255 Expenses Interest expense 5,432 8,236 4,234 Total expenses 5,432 8,236 4,234 Income before income taxes and equity in undistributed income of subsidiaries 160,601 173,554 67,021 Income tax benefit (1,499) (2,262) (1,151) Income of parent company 162,100 175,816 68,172 Equity (deficit) in undistributed income of subsidiaries (40,933) (10,641) 53,450 Net income $ 121,167 $ 165,175 $ 121,622 (1) Majority of balance eliminates in consolidation. STATEMENTS OF CASH FLOWS Years Ended December 31 2020 2019 2018 (Dollars in thousands) Cash flows from operating activities Net income $ 121,167 $ 165,175 $ 121,622 Adjustments to reconcile net income to cash provided by operating activities Amortization 152 157 54 Deferred income tax expense 284 1,021 49 Change in prepaid income taxes and other assets (1) (475) 20,556 135 Change in other liabilities (169) (4,613) 6 Deficit (equity) in undistributed income of subsidiaries 40,933 10,641 (53,450) Net cash provided by operating activities 161,892 192,937 68,416 Cash flows used in investing activities Cash paid for acquisitions, net of cash acquired (2) — (148,297) (13,649) Net cash used in investing activities — (148,297) (13,649) Cash flows provided by (used in) financing activities Proceeds from line of credit, net of issuance costs — 49,980 — Repayment of line of credit, net of issuance costs — (49,980) — Proceeds from (repayments of) long-term debt, net of issuance costs (42,187) 74,867 — Repayments of junior subordinated debentures, net of issuance costs — (13,329) — Proceeds from issuance of subordinated debentures, net of issuance costs — 49,526 — Repayments of subordinated debentures, net of issuance costs — (34,767) — Restricted stock awards issued, net of awards surrendered (1,187) (1,463) (1,371) Net proceeds from exercise of stock options 197 281 184 Proceeds from shares issued under the direct stock purchase plan 2,132 4,951 2,712 Payments for shares repurchased under share repurchase program (95,091) — — Common dividends paid (60,840) (53,274) (40,167) Net cash provided by (used in) financing activities (196,976) 26,792 (38,642) Net increase (decrease) in cash and cash equivalents (35,084) 71,432 16,125 Cash and cash equivalents at the beginning of the year 135,688 64,256 48,131 Cash and cash equivalents at the end of the year $ 100,604 $ 135,688 $ 64,256 (1) Reflected in this line for the year ended December 31, 2020 is a noncash adjustment which decreased prepaid income taxes and increased investment in subsidiary by $30.1 million, which represents a reallocation of a tax asset from the parent to the bank subsidiary.

SELECTED QUARTERLY FINANCIAL DA

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) First Quarter Second Quarter Third Quarter Fourth Quarter 2020 2019 2020 2019 2020 2019 2020 2019 (Dollars in thousands, except per share data) Interest income $ 107,380 $ 91,543 $ 99,965 $ 122,144 $ 97,919 $ 119,624 $ 96,805 $ 113,703 Interest expense 13,076 9,018 8,867 16,125 7,036 15,026 5,362 13,710 Net interest income 94,304 82,525 91,098 106,019 90,883 104,598 91,443 99,993 Provision for credit losses 25,000 1,000 20,000 1,000 7,500 — — 4,000 Total noninterest income 26,435 21,533 28,190 28,648 29,347 31,816 27,468 33,297 Total noninterest expenses 66,840 56,311 66,607 93,032 66,658 67,533 73,727 67,445 Provision for income taxes 2,148 11,522 7,779 10,007 11,199 17,036 10,543 14,368 Net income $ 26,751 $ 35,225 $ 24,902 $ 30,628 $ 34,873 $ 51,845 $ 34,641 $ 47,477 Basic earnings per share $ 0.78 $ 1.25 $ 0.76 $ 0.89 $ 1.06 $ 1.51 $ 1.05 $ 1.38 Diluted earnings per share $ 0.78 $ 1.25 $ 0.76 $ 0.89 $ 1.06 $ 1.51 $ 1.05 $ 1.38 Weighted average common shares (basic) 34,184,431 28,106,184 32,944,761 34,313,492 32,951,918 34,361,176 32,964,090 34,374,953 Common stock equivalents 36,827 54,466 28,098 41,878 24,758 39,390 26,348 46,245 Weighted average common shares (diluted) 34,221,258 28,160,650 32,972,859 34,355,370 32,976,676 34,400,566 32,990,438 34,421,198 Unusual or infrequently occurring items Items within noninterest income Gain on sale of loans $ — $ — $ — $ — $ — $ 951 $ — $ — Total $ — $ — $ — $ — $ — $ 951 $ — $ — Items within noninterest expense Loss on termination of derivatives — — — — 684 — — — Merger and acquisition expense $ — $ 1,032 $ — $ 24,696 $ — $ 705 $ — $ — Adjustment for tax effect of previously incurred merger and acquisition expense — 650 — — — — — — Total $ — $ 1,682 $ — $ 24,696 $ 684 $ 705 $ — $ —

TRANSACTIONS WITH RELATED PARTI

TRANSACTIONS WITH RELATED PARTIES (Notes)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	TRANSACTIONS WITH RELATED PARTIES Certain directors and officers (including their affiliates, certain family members and entities in which they are principal owners) of the Company are customers of and have had, and are expected to have, transactions with the Company, within the ordinary course of business. These transactions include, but are not limited to, lending activities, deposit services, investment management, and property lease commitments. In the opinion of management, such transactions are consistent with prudent banking practices and are within applicable banking regulations. Further details relating to certain related party transactions are outlined below: Lending Activities The following information represents annual activity of loans to related parties for the periods indicated: 2020 2019 (Dollars in thousands) Principal balance of loans outstanding at beginning of year $ 55,830 $ 41,170 Loan advances (1) 45,308 49,771 Loan payments/payoffs (74,795) (35,111) Principal balance of loans outstanding at end of year $ 26,343 $ 55,830 (1) The 2019 amount includes $7.0 million of BHB acquired loans associated with director, which represent the outstanding loans balances at the effective date of appointment. At December 31, 2020 and 2019, there were no loans to related parties which were past due, on nonaccrual status or that had been restructured as part of a troubled debt restructuring. Deposits At December 31, 2020 and 2019, the amount of deposit balances of related parties totaled $22.9 million and $13.0 million, respectively. Lease Commitments There were no material leases with related parties during the years ended December 31, 2020 and 2019.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
PRINCIPLES OF CONSOLIDATION	The consolidated financial statements include the accounts of the Company, the Bank and other wholly-owned subsidiaries, except subsidiaries that are not deemed necessary to be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company would consolidate voting interest entities in which it has all, or at least a majority of, the voting interest. As defined in applicable accounting standards, variable interest entities ("VIEs") are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company also owns the common stock of various trusts which have issued trust preferred securities. These trusts are VIEs in which the Company is not the primary beneficiary and, therefore, are not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income.
RECLASSIFICATION	Reclassification Certain previously reported amounts have been reclassified to conform to the current year’s presentation.
USE OF ESTIMATES	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for expected credit losses on loans held for investment, income taxes, valuation and allowance for expected credit losses on investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment.
SIGNIFICANT CONCENTRATIONS OF CREDIT RISK	Significant Concentrations of Credit Risk The vast majority of the Bank’s lending activities are conducted in Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 25% of the Bank’s tier one capital. Loans originated by the Bank to lessors of nonresidential buildings represented 17.1% and 17.5% of the total loan portfolio at December 31, 2020 and 2019, respectively. Within this concentration category, the Company believes it is well diversified among collateral property types and tenant industries.
CASH AND CASH EQUIVALENTS	Cash and Cash Equivalents For purposes of reporting cash flows, cash and cash equivalents may include cash on hand, amounts due from banks, inclusive of interest-earning deposits held at banks, and federal funds sold. Generally, federal funds are sold for up to two week periods.
SECURITIES	Securities Investment securities are classified at the time of purchase as available for sale, held to maturity, trading, or equity. Classification is constantly re-evaluated for consistency with corporate goals and objectives. Trading and equity securities are recorded at fair value with subsequent changes in fair value recorded in earnings. Debt securities that management has the positive intent and ability to hold to maturity are classified as held to maturity and recorded at amortized cost. Securities not classified as held to maturity or trading are classified as available for sale and recorded at fair value, with changes in fair value excluded from earnings and reported in other comprehensive income, net of related tax. Purchase premiums and discounts are recognized in interest income, using the interest method, to arrive at periodic interest income at a constant effective yield, thereby reflecting the securities market yield. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. Such gains and losses are recognized within non-interest income or non-interest expense within the consolidated statements of income. Accrued interest receivable balances are excluded from the amortized cost of held to maturity securities and the fair value of available for sale securities and are included within other assets on the Consolidated Balance Sheets. Management has elected not to measure an allowance for credit losses on these balances as the Company employs a timely write-off policy. It is the Company's policy that a security is placed on nonaccrual status at the time any principal or interest payments become 90 days delinquent, and interest earned but not collected for a security placed on non-accrual is reversed against interest income. Prior to the Company's adoption of the current expected credit loss ("CECL") standard, declines in the fair value of held to maturity and available for sale securities below their amortized cost deemed to be OTTI were written down to fair value as determined by a cash flow analysis. To the extent the estimated cash flows did not support the amortized cost, the deficiency was considered to be due to credit loss and recognized in earnings. Unless the Company intended to sell the security, or if it was more likely than not that the Company would be required to sell the debt security before its anticipated recovery, the remainder of the OTTI charge was considered to be due to other factors, such as liquidity or interest rates, and thus was not recognized in earnings, but rather through other comprehensive income, net of related tax. The Company evaluated individual securities that had fair values below cost for six months or longer, or for a shorter period of time if considered appropriate by management, to determine if the decline in fair value was other-than-temporary. Consideration was given to the obligor of the security, whether the security was guaranteed, whether there was a projected adverse change in cash flows, the liquidity of the security, the type of security, the capital position of security issuers, and payment history of the security, amongst other factors when evaluating such securities. Allowance for Credit Losses - Available for Sale Securities The Company's available for sale securities are carried at fair value and assessed for estimated credit losses in accordance with the current expected credit loss ("CECL") methodology. For available for sale securities in an unrealized loss position, management will first evaluate whether there is intent to sell, or if it is more likely than not that the Company will be required to sell a security prior to anticipated recovery of its amortized cost basis. If either of these criteria are met, the Company will record a write-down of the security's amortized cost basis to fair value through income. For those available for sale securities which do not meet the intent or requirement to sell criteria, management will evaluate whether the decline in fair value is a result of credit related matters or other factors. In performing this assessment, management considers the creditworthiness of the issuer including whether the security is guaranteed by the U.S. Federal Government or other government agency, the extent to which fair value is less than amortized cost, and changes in credit rating during the period, among other factors. If this assessment indicates the existence of credit losses, the security will be written down to fair value, as determined by a discounted cash flow analysis. To the extent the estimated cash flows do not support the amortized cost, the deficiency is considered to be due to credit loss and is recognized in earnings. Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when the uncollectibility of a security is confirmed, or when either of the aforementioned criteria surrounding intent or requirement to sell have been met. Allowance for Credit Losses - Held to Maturity Securities The Company measures expected credit losses on held to maturity securities on a collective basis by major security type in accordance with the CECL methodology. Management classifies the held to maturity portfolio into the following major security types: U.S. Government Agency, U.S. Treasury, Agency Mortgage-Backed Securities, Agency Collateralized Mortgage Obligations, Small Business Administration Pooled Securities, and Single Issuer Trust Preferred Securities. Securities in the Company's held to maturity portfolio are primarily guaranteed by either the U.S. Federal Government or other government sponsored agencies with a long history of no credit losses. As a result, management has determined these securities to have a zero loss expectation and therefore does not estimate an allowance for credit losses on these securities.
LOANS HELD FOR SALE	Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes. The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments and forward sales commitments. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Upfront costs and fees related to items for which the fair value option is elected are recognized in earnings as incurred and are not deferred.
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts	Allowance for Credit Losses - Loans Held for Investment The allowance for credit losses is established based upon the Company's current estimate of expected lifetime credit losses on loans measured at amortized cost. Credit losses are charged against the allowance when management's assessments confirm that the Company will not collect the full amortized cost basis of a loan. Subsequent recoveries, if any, are credited to the allowance. Under the CECL methodology, the Company estimates credit losses for financial assets on a collective basis for loans sharing similar risk characteristics using a quantitative model combined with an assessment of certain qualitative factors designed to address forecast risk and model risk inherent in the quantitative model output. The quantitative model utilizes a factor based approach to estimate expected credit losses using Probability of Default ("PD"), Loss Given Default ("LGD") and Exposure at Default ("EAD"), which are derived from internal historical default and loss experience. The model estimates expected credit losses using loan level data over the estimated life of the exposure, considering the effect of prepayments. Economic forecasts are incorporated into the estimate over a reasonable and supportable forecast period, beyond which is a reversion to the Company's historical long-run average. Management has determined a reasonable and supportable period of 12 months, and a straight line reversion period of 6 months, to be appropriate for purposes of estimating expected credit losses. The qualitative risk factors impacting the expected risk of loss within the portfolio include the following: • Lending policies and procedures • Economic and business conditions • Nature and volume of loans • Changes in management • Changes in credit quality • Changes in loan review system • Changes to underlying collateral values • Concentrations of credit risk • Model imprecision • Other external factors Loans that do not share similar risk characteristics with any pools of assets are subject to individual evaluation and are removed from the collectively assessed pools to avoid double counting. For the loans that are individually evaluated, the Company uses either a discounted cash flow (“DCF”) approach or a fair value of collateral approach. The latter approach is used for loans deemed to be collateral dependent or when foreclosure is probable. Accrued interest receivable amounts are excluded from balances of loans held at amortized cost and are included within other assets on the consolidated balance sheet. Management has elected not to measure an allowance for credit losses on these amounts as the Company employs a timely write-off policy. Consistent with the Company's policy for nonaccrual loans, accrued interest receivable is typically written off when loans reach 90 days past due and are placed on nonaccrual status.
ACQUIRED LOANS	Acquired Loans Prior to its adoption of CECL, and under legacy GAAP, the Company maintained a portfolio of acquired loans, which, at acquisition, were recorded at fair value with no carryover of the allowance for credit losses. Acquired loans were also reviewed to determine if the loan had evidence of deterioration in credit quality and also if it was probable, at acquisition, that all contractually required payments would not be collected. Loans meeting such criteria were deemed to be purchased credit impaired ("PCI") loans. Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the "accretable yield", was accreted into interest income over the life of the loans using the effective yield method. Accordingly, PCI loans were not subject to classification as nonaccrual in the same manner as originated loans. Rather, acquired PCI loans were generally considered to be accruing loans because their interest income related to the accretable yield recognized and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the "nonaccretable difference", included estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans. Under the CECL standard, the concept of PCI assets was effectively replaced with purchased credit deteriorated ("PCD") assets, the balances of which should be treated in a manner consistent with loans held for investment for purposes of estimating an allowance for credit losses. As a result, upon the Company's adoption of CECL on January 1, 2020, loan balances previously classified as PCI assets were re-classified as PCD assets and have been prospectively accounted for in accordance with the standard. Loans Held for Sale The Bank primarily classifies new residential real estate mortgage loans as held for sale based on intent, which is determined when loans are underwritten. Residential real estate mortgage loans not designated as held for sale are retained based upon available liquidity, for interest rate risk management and other business purposes. The Company has elected the fair value option to account for originated closed loans intended for sale. Accordingly, changes in fair value relating to loans intended for sale are recorded in earnings and are offset by changes in fair value relating to interest rate lock commitments and forward sales commitments. Gains and losses on residential loan sales (sales proceeds minus carrying amount) are recorded in mortgage banking income. Upfront costs and fees related to items for which the fair value option is elected are recognized in earnings as incurred and are not deferred. Loans Loans are carried at the principal amounts outstanding, or fair value in the case of acquired loans, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. For acquired loans which did not show signs of credit deterioration at acquisition, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. As a general rule, loans 90 days or more past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are 90 days or more past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the recorded investment in the asset to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring ("TDR"). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. 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. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring. Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Loans held for sale are generally sold with servicing rights released, however if rights are retained, servicing assets are recognized as separate assets. Servicing rights are originally recorded at fair value within other assets, but subsequently are amortized in proportion to and over the period of estimated net servicing income, and are assessed for impairment at each reporting date. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds, default rates and losses. Impairment is determined by stratifying the rights based on predominant characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the capitalized amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income. Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan, and are recorded as income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income. The Company is also a party to certain instruments with off-balance-sheet risk including certain residential loans sold to investors with recourse. The Company's policy is to record such instruments when funded.
FEDERAL HOME LOAN BANK STOCK	Federal Home Loan Bank Stock The Company, as a member of the Federal Home Loan Bank ("FHLB") of Boston, is required to maintain an investment in capital stock of the FHLB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. The Company continually reviews its investment to determine if impairment exists. The Company reviews recent public filings, rating agency analysis and other factors when making its determination.
BANK PREMISES AND EQUIPMENT	Bank Premises and Equipment Land is carried at cost. Bank premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line convention method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the lease terms or the estimated useful lives of the improvements. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured, not to exceed fifteen years.
GOODWILL AND IDENTIABLE INTANGIBLE ASSETS	Goodwill and Other Intangible Assets The Company adopted ASC Topic 350 "Intangibles - Goodwill and Other" Update No. 2017-04 on January 1, 2020, and as previously disclosed, there was no material impact to the financial statements. Goodwill represents the excess of the purchase price over the net fair value of acquired businesses. Goodwill is not amortized and is assigned to one reporting unit. Goodwill is evaluated for impairment at least annually, or more often if warranted, using a combined qualitative and quantitative impairment approach. The initial qualitative approach assesses whether the existence of events or circumstances led to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company determines it is more likely than not that the fair value is less than carrying value, a quantitative impairment test is performed to compare carrying value to the fair value of the reporting unit. If the carrying amount of the reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. Other intangible assets subject to amortization consist of core deposit intangibles, customer lists and market-based favorable or unfavorable lease positions at time of acquisition, and are amortized over the estimated lives of the intangibles using a method that approximates the amount of economic benefits that are realized by the Company. 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. The range of useful lives is as follows: Core deposit intangibles 10 years Customer Lists 12 years Leases 3 - 30 years The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets.
IMPAIRMENT OF LONG-LIVED ASSETS OTHER THAN GOODWILL	Impairment of Long-Lived Assets Other Than Goodwill The Company reviews long-lived assets, including premises and equipment, for impairment whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision or that the carrying amount of the long-lived asset may not be fully recoverable. The Company performs an undiscounted cash flow analysis to determine if impairment exists. When impairment is determined to exist, the related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of are based on the estimated proceeds to be received, less costs of disposal.
CASH SURRENDER VALUE OF LIFE INSURANCE POLICIES	Cash Surrender Value of Life Insurance Policies Increases in the cash surrender value ("CSV") of life insurance policies, as well as benefits received net of any CSV, are recorded in other noninterest income, and are generally not subject to income taxes. The CSV of the policies is recorded as an asset of the Bank, with liabilities recognized for any split dollar arrangements associated with the policies. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. Regulatory requirements limit the total amount of CSV to be held with any individual carrier to 15% of Tier 1 capital (as defined for regulatory purposes) and the total CSV of all life insurance policies is limited to 25% of Tier 1 capital.
OTHER REAL ESTATE OWNED AND OTHER FORECLOSED ASSETS	Other Real Estate Owned and Other Foreclosed Assets Real estate properties and other assets, which have served as collateral to secure loans, are held for sale and are initially recorded at fair value less estimated costs to sell at the date control is established, resulting in a new cost basis. The amount by which the recorded investment in the loan exceeds the fair value (net of estimated costs to sell) of the foreclosed asset is charged to the allowance for credit losses. Subsequent declines in the fair value of the foreclosed asset below the new cost basis are recorded through the use of a valuation allowance. Subsequent increases in the fair value are recorded as reductions in the valuation allowance, but not below zero. Upon a sale of a foreclosed asset, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the foreclosed asset is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses and changes in the valuation allowance relating to foreclosed assets are included in other noninterest expense.
DERIVATIVES	Derivatives 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 determined by whether it has been designated and qualifies as part of a hedging relationship, and further, by the type of hedging relationship. At the inception of a hedge, the Company documents certain items, including but not limited to the following: the relationship between hedging instruments and hedged items, the Company's risk management objectives, hedging strategies, and the evaluation of hedge transaction effectiveness. Documentation includes linking all derivatives designated as fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions. For those derivative instruments that are designated and qualify for special hedge accounting, the Company designates the hedging instrument, based upon the exposure being hedged, as either a fair value hedge or a cash flow hedge. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income, net of related tax. The Company considers any economic mismatch between the hedging instrument and the hedged transaction in its ongoing assessment of hedge effectiveness. If the hedging instrument is not highly effective at achieving offsetting cash flows attributable to the revised contractually specified interest rate(s), hedge accounting will be discontinued. At that time, accumulated other comprehensive income would be frozen and amortized, as long as the forecasted transactions are still probable of occurring. For derivative instruments designated and qualifying as a fair value hedge (i.e., hedging the exposure to changes in the fair value of an asset or liability or an identified portion thereof that is attributable to the hedged risk), the gain or loss on the derivative instrument, as well as the offsetting gain or loss on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. Hedge accounting is discontinued prospectively when (1) a derivative is no longer highly effective in offsetting changes in the fair value or cash flow of a hedged item, (2) a derivative expires or is settled, (3) it is no longer likely that a forecasted transaction associated with the hedge will occur, or (4) it is determined that designation of a derivative as a hedge is no longer appropriate. To the extent the Company enters into new or re-designates existing hedging relationships, it is the Company's policy to include the Overnight Index Swap Rate based on the Fed Funds Effective Rate and the Overnight Index Swap Rate based on the Secured Overnight Financing Rate in the spectrum of available benchmark interest rates for hedge accounting.
RETIREMENT PLANS	Retirement Plans The Company has various retirement plans in place for current and former employees, including postretirement benefit plans, supplemental executive retirement plans, frozen multiemployer pension plans, deferred compensation plans, as well as other benefits. The postretirement benefit plans and the supplemental executive retirement plans are unfunded and therefore have no plan assets. The actuarial cost method used to compute the benefit liabilities and related expense is the projected unit credit method. The projected benefit obligation is principally determined based on the present value of the projected benefit distributions at an assumed discount rate. The discount rate which is utilized is based on the investment yield of high quality corporate bonds available in the market place with maturities approximately equal to projected cash flows of future benefit payments as of the measurement date. Periodic benefit expense (or income) includes service costs and interest costs based on the assumed discount rate, amortization of prior service costs due to plan amendments and amortization of actuarial gains and losses. Service costs are included in salaries and employee benefits and all other costs are included in other noninterest expense. The amortization of actuarial gains and losses is determined using the 10% corridor minimum amortization approach and is taken over the average remaining future working lifetime of the plan participants. The underfunded status of the plans is recorded as a liability on the balance sheet. The multiemployer pension plans' assets are determined based on fair value, generally representing observable market prices. The actuarial cost method used to compute the pension liabilities and related expense is the unit credit method. The pension expense is equal to the plan contribution requirement of the Company for the plan year. In conjunction with the acquisition of Blue Hills Bancorp, Inc., parent of Blue Hills Bank (collectively "BHB") the Company acquired BHB's defined benefit pension plan, which is administered by the Savings Banks Employees Retirement Association. The Company accounts for the plan using an actuarial model that allocates pension costs over the service period of employees in the plan. The Company accounts for the over-funded or under-funded status of the plan as an asset or liability on its consolidated balance sheets and recognizes changes in the funded status that are not reflected in net periodic pension cost as other comprehensive income or loss. BHB amended its defined benefit pension plan in 2013 freezing the plan to new participants and subsequently amended the plan and froze it for all participants effective October 31, 2014. The Director Deferred Compensation Plan allows directors to invest their funds into a diversified investment portfolio and the 401(k) Restoration Plan allows employees to invest their funds in both Company stock and other investment alternatives offered by the Plan. All funds under both of these plans are held in a rabbi trust. The plans do not permit diversification after initial election and therefore elections made to defer into Company stock result in both the investment and obligation recognized within Stockholders' Equity. Alternatively, investments not in Company stock are included in trading securities, with the correlating obligation classified as a liability.
STOCK-BASED COMPENSATION	Stock-Based Compensation The Company recognizes stock-based compensation based on the grant-date fair value of the award, with no adjustment for estimated forfeitures, as forfeitures are recognized when they occur. For restricted stock awards and units, the Company recognizes compensation expense ratably over the vesting period for the fair value of the award, measured at the grant date. For stock option awards, the Company values awards granted using the Black-Scholes option-pricing model. The Company recognizes compensation expense for these awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time. The Company recognizes excess tax benefits on certain stock compensation transactions. The excess tax benefits are recorded through earnings as a discrete item within the Company’s effective tax rate during the period of the transaction.
INCOME TAXES	Income Taxes Deferred income tax assets and liabilities are determined using the asset and liability (or balance sheet) method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current available information raises doubt as to the realization of the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in enacted tax rates is recognized in income in the period that includes the enactment date. Income taxes are allocated to each entity in the consolidated group based on its share of taxable income. Management exercises significant judgment in evaluating the amount and timing of recognition of the resulting tax liabilities and assets, including projections of future taxable income. Additionally, a liability for unrecognized tax benefits is recorded for uncertain tax positions taken by the Company on its tax returns for which there is less than a 50% likelihood of being recognized upon a tax examination.
Low Income Housing Tax Credits Policy Text Block [Policy Text Block]	Low Income Housing Tax CreditsThe Company accounts for its investments in qualified affordable housing projects using the proportional amortization method. Under the proportional amortization method the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment benefit as a component of income tax expense (benefit).
ASSETS UNDER ADMININSTRATION	Assets Under Administration Assets held in a fiduciary or agency capacity for customers are not included in the accompanying consolidated balance sheet, as such assets are not assets of the Company. Revenue from administrative and management activities associated with these assets is recorded on an accrual basis.
Extinguishment of Debt [Policy Text Block]	Extinguishment of Debt Upon extinguishment of an outstanding debt, the Company records the difference between the exit price and the net carrying amount of the debt as a gain or loss on the extinguishment. The gain or loss is recorded as a component of other noninterest income or other noninterest expense, respectively.
EARNINGS PER SHARE	Earnings Per Share Basic earnings per share is calculated using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated from common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Under this method, all earnings distributed and undistributed, are allocated to participating securities and common shares based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities, not subject to performance based measures (i.e. unvested time-vested restricted stock). Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding (inclusive of participating securities). Diluted earnings per share have been calculated in a manner similar to that of basic earnings per share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if all potentially dilutive common shares (such as those resulting from the exercise of stock options or the attainment of performance measures) were issued during the period, computed using the treasury stock method.
COMPREHENSIVE INCOME	Comprehensive Income Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale, unrealized losses related to factors other than credit on debt securities, if applicable, unrealized gains and losses on cash flow hedges, deferred gains on hedge accounting transactions, and changes in the funded status of the Company’s postretirement and supplemental retirement plans.
FAIR VALUE MEASUREMENTS	Fair Value Measurements In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters.
Lessee, Leases [Policy Text Block]	LeasesThe Company leases office space, space for ATM locations and certain branch locations under noncancelable operating leases, several of which have renewal options to extend lease terms. Upon commencement of a new lease, the Company will recognize a right of use ("ROU") asset and corresponding lease liability. The Company makes the decision on whether to renew an option to extend a lease by considering various factors. The Company will recognize an adjustment to its ROU asset and lease liability when lease agreements are amended and executed. The discount rate used in determining the present value of lease payments is based on the Company's incremental borrowing rate for borrowings with terms similar to each lease at commencement date. The Company has lease agreements with lease and non-lease components, which are generally accounted for separately. For real estate leases, non-lease components and other non-components, such as common area maintenance charges, real estate taxes, and insurance are not included in the measurement of the lease liability since they are generally able to be segregated. The Company has elected the short-term lease recognition exemption for all leases that qualify.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Standards Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 326 "Financial Instruments - Credit Losses" Update No. 2016-13. The standard was issued in June 2016 and has been amended three times by the FASB (collectively, the "updates"). The purpose of the updates is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, these updates replace the incurred loss impairment methodology in current GAAP with a methodology, referred to as the current expected credit losses ("CECL") methodology, which reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The updates affect loans, debt securities, trade receivables, net investments in leases, off-balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The Company adopted the CECL standard effective January 1, 2020. The Company adopted the standard using the modified retrospective method for all financial assets measured at amortized cost, net investment in leases and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under the CECL standard, while prior period results are presented under standards previously applicable under GAAP. The cumulative effect of the Company's adoption resulted in an immaterial increase to retained earnings as of the January 1, 2020 adoption date. This transition adjustment was a result of the change in allowance methodology, including the impact to the reserve on unfunded commitments resulting from the application of new guidance under CECL, as well as the day one gross-up of purchased credit deteriorated ("PCD") assets. The standard was adopted using the prospective transition approach for PCD assets that were previously classified as purchased credit impaired ("PCI") assets. As prescribed by the standard, management did not reassess whether PCI assets met the criteria of PCD assets at the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets were adjusted to reflect estimated credit losses, with the remaining non-credit related discount, calculated based on the adjusted amortized cost, and will be accreted into interest income on a straight line basis over the remaining contractual term of the asset. See Note 3, "Securities," and Note 4, "Loans, Allowance for Credit Losses and Credit Quality" for further details surrounding the Company's adoption of CECL. FASB ASC Subtopic 715-20 "Compensation - Retirement Benefits - Defined Benefit Plans - General" Update No. 2018-14. Update No. 2018-14 was issued in August 2018 to remove disclosures that are no longer considered cost beneficial, clarify the specific requirements of disclosures, and add certain disclosure requirements. The amendments in this update are effective for fiscal years ending after December 15, 2020, for public business entities. Accordingly, the Company adopted this standard as of the year ended December 31, 2020. The adoption of this standard did not have an impact on the Company's consolidated financial position. 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
Policy Loans Receivable, Policy	Loans Held for Investment Loans that the Company has the intent and ability to hold until maturity or payoff are carried at amortized cost (net of the allowance for credit losses). Amortized cost is the principal amount outstanding, adjusted by partial charge-offs and net of deferred loan costs or fees. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the expected term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. Interest income on loans is accrued based upon the daily principal amount outstanding except for loans on nonaccrual status. As a general rule, loans 90 days or more past due with respect to principal or interest are classified as nonaccrual loans, or sooner if management considers such action to be prudent. However, loans that are 90 days or more past due may be kept on an accruing status if the loan is well secured and in the process of collection. The Company may also put a junior lien mortgage on nonaccrual status as a result of delinquency with respect to the first position, which is held by the Bank or by another financial institution, while the junior lien is currently performing. Income accruals are suspended on all nonaccrual loans in a timely manner and all previously accrued and uncollected interest is reversed against current income. A loan remains on nonaccrual status until it becomes current with respect to principal and interest (and in certain instances remains current for up to six months), the loan is liquidated, or when the loan is determined to be uncollectible and is charged-off against the allowance for credit losses. When doubt exists as to the collectability of a loan, any payments received are applied to reduce the amortized cost of the loan to the extent necessary to eliminate such doubt. For all loan portfolios, a charge-off occurs when the Company determines that a specific loan, or portion thereof, is uncollectible. This determination is made based on management's review of specific facts and circumstances of the individual loan, including assessing the viability of the customer’s business or project as a going concern, the expected cash flows to repay the loan, the value of the collateral and the ability and willingness of any guarantors to perform. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructuring ("TDR"). Modifications may include adjustments to interest rates, extensions of maturity, consumer loans where the borrower's obligations have been effectively discharged through Chapter 7 Bankruptcy and the borrower has not reaffirmed the debt to the Bank, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. The recorded investment of loans classified as TDRs is adjusted to reflect the changes in value, if any, resulting from the granting of a concession. Nonaccrual loans that are restructured remain on nonaccrual for a period of six months to demonstrate that the borrower can meet the restructured terms. 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. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a nonaccrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring.
Credit Loss, Financial Instrument	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, one-to-four 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 one-to-four family residential properties. Residential mortgage loans also include loans to construct owner-occupied one-to-four 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 one-to-four 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 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 downgrades of risk ratings.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Asses Useful Lives	The range of useful lives is as follows: Core deposit intangibles 10 years Customer Lists 12 years Leases 3 - 30 years The determination of which intangible assets have finite lives is subjective, as is the determination of the amortization period for such intangible assets.

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2020
Business Acquisition [Line Items]
Purchased Credit Impaired Loans Associated with Acquisition [Table Text Block]	The following is a summary of these PCI loans associated with the acquisition as of the date acquired: As of April 1, 2019 (Dollars in thousands) Contractually required principal and interest at acquisition $ 14,849 Contractual cash flows not expected to be collected (5,717) Expected cash flows at acquisition 9,132 Interest component of expected cash flows (1,464) Basis in PCI loans at acquisition - estimated fair value $ 7,668
Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: Net Assets Acquired at Fair Value (Dollars in thousands) Assets Cash $ 56,331 Investments 196,937 Loans 2,073,714 Premises and equipment 24,253 Goodwill 250,101 Core deposit and other intangibles 19,870 Other assets 146,192 Total assets acquired 2,767,398 Liabilities Deposits 1,930,436 Borrowings 124,817 Other liabilities 50,857 Total liabilities assumed 2,106,110 Purchase price $ 661,288
Business Acquisition, Pro Forma Information [Table Text Block]	The selected pro forma financial information is presented for illustrative purposes only and is not necessarily indicative of the financial results of the combined companies had the acquisition actually been completed at the beginning of the period presented, nor does it indicate future results for any other interim or full-year period. Year Ended December 31 2019 2018 (Dollars in thousands) Net interest income after provision for credit losses $ 408,918 $ 371,264 Net income $ 129,385 $ 146,178

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Equity securities gains and losses [Table Text Block]	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: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Net gains (losses) recognized during the period on equity securities $ 528 $ 1,566 (1,225) Less: net gains recognized during the period on equity securities sold during the period 14 18 874 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 514 $ 1,548 (2,099)
Schedule of Available-for-sale Securities Reconciliation	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) at the dates indicated: December 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ 22,476 $ 1,640 $ — $ — $ 24,116 $ 32,473 $ 642 $ — $ 33,115 Agency mortgage-backed securities 224,293 9,337 (1) — 233,629 243,548 3,456 (4) 247,000 Agency collateralized mortgage obligations 88,687 3,083 (87) — 91,683 87,305 1,225 (19) 88,511 State, county, and municipal securities 790 17 — — 807 1,377 19 — 1,396 Single issuer trust preferred securities issued by banks 489 — (1) — 488 488 5 — 493 Pooled trust preferred securities issued by banks and insurers 1,429 — (373) — 1,056 1,488 — (374) 1,114 Small business administration pooled securities 57,289 3,792 — — 61,081 54,024 771 — 54,795 Total available for sale securities $ 395,453 $ 17,869 $ (462) $ — $ 412,860 $ 420,703 $ 6,118 $ (397) $ 426,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following table shows the gross unrealized losses and fair value of the Company’s available for sale securities which are in an unrealized loss position, and for which the Company has not recorded a provision for credit losses for the year ended December 31, 2020. 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: December 31, 2020 Less than 12 months 12 months or longer Total # of Fair Value Unrealized Fair Unrealized Fair Value 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	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) at the dates indicated: December 31, 2020 December 31, 2019 Amortized Gross Gross Unrealized Allowance for credit losses Fair Amortized Gross Gross Unrealized Fair (Dollars in thousands) U.S. government agency securities $ — $ — $ — $ — $ — $ 12,874 $ 123 $ — $ 12,997 U.S. treasury securities 4,017 60 — — 4,077 4,032 21 — 4,053 Agency mortgage-backed securities 356,085 18,036 — — 374,121 397,414 8,445 (57) 405,802 Agency collateralized mortgage obligations 335,993 8,466 (340) — 344,119 293,662 4,501 (849) 297,314 Single issuer trust preferred securities issued by banks 1,500 — (2) — 1,498 1,500 — (10) 1,490 Small business administration pooled securities 26,917 1,445 — — 28,362 31,324 338 (55) 31,607 Total held to maturity securities $ 724,512 $ 28,007 $ (342) $ — $ 752,177 $ 740,806 $ 13,428 $ (971) $ 753,263
Schedule of Contractual Maturities of Securities	A schedule of the contractual maturities of securities available for sale and securities held to maturity at December 31, 2020 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 $ 10,231 $ 12,475 $ 13,885 $ — $ — $ 22,476 $ 24,116 Agency mortgage-backed securities — — 74,048 76,441 29,265 31,458 120,980 125,730 224,293 233,629 Agency collateralized mortgage obligations — — — — — — 88,687 91,683 88,687 91,683 State, county, and municipal securities 600 601 — — 190 206 — — 790 807 Single issuer trust preferred securities issued by banks — — — — — — 489 488 489 488 Pooled trust preferred securities issued by banks and insurers — — — — — — 1,429 1,056 1,429 1,056 Small business administration pooled securities — — — — — — 57,289 61,081 57,289 61,081 Total available for sale securities $ 600 $ 601 $ 84,049 $ 86,672 $ 41,930 $ 45,549 $ 268,874 $ 280,038 $ 395,453 $ 412,860 Held to maturity securities U.S. Treasury securities 1,999 2,023 2,018 2,054 — — — — 4,017 4,077 Agency mortgage-backed securities — — 2,472 2,588 75,240 78,169 278,373 293,364 356,085 374,121 Agency collateralized mortgage obligations — — — — — — 335,993 344,119 335,993 344,119 Single issuer trust preferred securities issued by banks — — — — 1,500 1,498 — — 1,500 1,498 Small business administration pooled securities — — — — — — 26,917 28,362 26,917 28,362 Total held to maturity securities 1,999 2,023 4,490 4,642 76,740 79,667 641,283 665,845 724,512 752,177 Total $ 2,599 $ 2,624 $ 88,539 $ 91,314 $ 118,670 $ 125,216 $ 910,157 $ 945,883 $ 1,119,965 $ 1,165,037
Schedule of Gross Unrealized Losses and Fair Value of Investments	December 31, 2019 Less than 12 months 12 months or longer Total # of Fair Value Unrealized Fair Unrealized Fair Value Unrealized (Dollars in thousands) Agency mortgage-backed securities 12 $ 34,009 $ (59) $ 243 $ (2) $ 34,252 $ (61) Agency collateralized mortgage obligations 17 48,476 (215) 37,382 (653) 85,858 (868) Single issuer trust preferred securities issued by banks and insurers 1 — — 1,490 (10) 1,490 (10) Pooled trust preferred securities issued by banks and insurers 1 — — 1,114 (374) 1,114 (374) Small business administration pooled securities 1 7,349 (55) — — 7,349 (55) Total temporarily impaired securities 32 $ 89,834 $ (329) $ 40,229 $ (1,039) $ 130,063 $ (1,368)

Credit Losses (Tables)

Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
Financing Receivable, Allowance for Credit Loss	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 year ended December 31, 2020: Years Ended December 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 (1) (1,984) (13,048) (3,652) 495 9,828 7,012 212 (1,137) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs (2,309) (3,885) — (380) (105) (142) (1,625) (8,446) Recoveries 289 9 — 33 2 210 1,035 1,578 Provision for credit loss expense 7,447 28,661 2,996 3,201 687 9,085 423 52,500 Ending balance (3) $ 21,086 $ 45,009 $ 5,397 $ 5,095 $ 14,275 $ 22,060 $ 470 $ 113,392 (1) 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. (2) 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. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $36.0 million at December 31, 2020. The following table bifurcates the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis at December 31, 2019 and 2018: December 31, 2019 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs (244) (2,614) — (509) — (240) (1,598) (5,205) Recoveries 1,131 152 — 122 142 318 787 2,652 Provision (benefit) 947 3,027 895 377 79 (110) 785 6,000 Ending balance $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Ending balance: collectively evaluated for impairment $ 17,468 $ 32,887 $ 6,053 $ 1,738 $ 2,803 $ 5,420 $ 391 $ 66,760 Ending balance: individually evaluated for impairment $ 126 $ 48 $ — $ 8 $ 637 $ 156 $ 5 $ 980 Financing receivables ending balance: Collectively evaluated for impairment $ 1,370,580 $ 3,987,848 $ 547,293 $ 173,960 $ 1,571,848 $ 1,127,963 $ 29,663 $ 8,809,155 Individually evaluated for impairment 24,456 8,337 — 537 11,228 4,948 122 49,628 Purchased credit impaired loans — 6,174 — — 7,493 887 302 14,856 Total loans by group $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 1,590,569 $ 1,133,798 $ 30,087 $ 8,873,639 (1) December 31, 2018 Commercial Commercial Commercial Small Residential Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Charge-offs (355) (82) — (372) (148) (293) (1,347) (2,597) Recoveries 182 188 — 46 12 156 888 1,472 Provision (benefit) 2,677 811 (540) 505 533 355 434 4,775 Ending balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Ending balance: collectively evaluated for impairment $ 15,753 $ 32,333 $ 5,158 $ 1,755 $ 2,357 $ 5,444 $ 414 $ 63,214 Ending balance: individually evaluated for impairment $ 7 $ 37 $ — $ 1 $ 862 $ 164 $ 8 $ 1,079 Financing receivables ending balance: Collectively evaluated for impairment $ 1,064,800 $ 3,235,418 $ 365,165 $ 164,135 $ 906,959 $ 1,085,961 $ 15,901 $ 6,838,339 Individually evaluated for impairment 28,829 10,839 — 541 12,706 5,948 197 59,060 Purchase credit impaired loans — 4,991 — — 3,629 175 — 8,795 Total loans by group $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 923,294 $ 1,092,084 $ 16,098 $ 6,906,194 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million at December 31, 2019 and 2018. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance were $21.6 million and $15.2 million at December 31, 2019 and 2018 respectively.
Financing Receivable Credit Quality Indicators	The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year at December 31, 2020: 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 1,074,773 (1) $ 141,859 $ 97,908 $ 30,431 $ 19,426 $ 19,749 $ 631,049 $ 2,538 $ 2,017,733 Potential weakness 9,020 1,869 670 4,997 1,539 294 20,766 — 39,155 Definite weakness - loss unlikely 2,009 1,310 19,575 2,997 320 429 6,991 — 33,631 Partial loss probable 672 — — — 156 143 11,662 — 12,633 Definite loss — — — — — — — — — Total commercial and industrial $ 1,086,474 $ 145,038 $ 118,153 $ 38,425 $ 21,441 $ 20,615 $ 670,468 $ 2,538 $ 2,103,152 Commercial real estate Pass $ 1,054,345 $ 726,276 $ 480,725 $ 544,826 $ 372,542 $ 664,256 $ 19,085 $ 14,737 $ 3,876,792 Potential weakness 27,877 55,166 30,286 19,531 25,462 71,252 13,610 — 243,184 Definite weakness - loss unlikely 25,878 3,502 3,857 10,185 3,376 7,153 — — 53,951 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 1,108,100 $ 784,944 $ 514,868 $ 574,542 $ 401,380 $ 742,661 $ 32,695 $ 14,737 $ 4,173,927 Commercial construction Pass $ 255,679 $ 167,948 $ 30,706 $ 32,538 $ — $ 6,689 $ 31,705 $ 588 $ 525,853 Potential weakness 17,528 9,953 520 — — — 75 — 28,076 Definite weakness - loss unlikely — — — — — — — — — Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 273,207 $ 177,901 $ 31,226 $ 32,538 $ — $ 6,689 $ 31,780 $ 588 $ 553,929 Small business Pass $ 41,713 $ 27,751 $ 19,497 $ 13,411 $ 13,837 $ 19,624 $ 35,451 $ — $ 171,284 Potential weakness — 10 15 15 6 217 822 — 1,085 Definite weakness - loss unlikely 684 438 122 11 137 353 883 — 2,628 Partial loss probable — — — — — — 26 — 26 Definite loss — — — — — — — — — Total small business $ 42,397 $ 28,199 $ 19,634 $ 13,437 $ 13,980 $ 20,194 $ 37,182 $ — $ 175,023 Residential real estate Pass $ 219,595 $ 146,058 $ 160,422 $ 144,638 $ 215,568 $ 401,279 $ — $ — $ 1,287,560 Default — — 427 — 4,158 4,038 — — 8,623 Total residential real estate $ 219,595 $ 146,058 $ 160,849 $ 144,638 $ 219,726 $ 405,317 $ — $ — $ 1,296,183 Home equity Pass $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,360 $ 661,575 $ 4,663 $ 1,066,158 Default — — — — — 440 1,837 355 2,632 Total home equity $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,800 $ 663,412 $ 5,018 $ 1,068,790 Other consumer Pass $ 816 $ 398 $ 165 $ 665 $ 615 $ 6,749 $ 12,317 $ — $ 21,725 Default — — — 15 — 111 11 — 137 Total other consumer $ 816 $ 398 $ 165 $ 680 $ 615 $ 6,860 $ 12,328 $ — $ 21,862 Total $ 2,812,901 $ 1,341,947 $ 896,983 $ 857,830 $ 698,323 $ 1,314,136 $ 1,447,865 $ 22,881 $ 9,392,866 (1) Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are reported as commercial and industrial under the 2020 vintage year and as"Pass" because these loans are 100% guaranteed by the U.S. Government. Funded PPP loans outstanding totaled $791.9 million at December 31, 2020. December 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 57.4 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 771 767 LTV (re-valued)(2)(3) 46.0 % 46.6 % (1) The average FICO scores at December 31, 2020 are based upon rescores from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for December 31, 2020 are based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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. The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio: December 31, 2019 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness - loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185
Financing Receivable, Nonaccrual	The following table shows information regarding nonaccrual loans at the dates indicated: Nonaccrual Balances December 31, 2020 December 31, 2019 With Allowance for Credit Losses Without Allowance for Credit Losses Total Total (Dollars in thousands) Commercial and industrial $ 3,804 $ 30,925 $ 34,729 $ 22,574 Commercial real estate 10,195 — 10,195 3,016 Small business 815 10 825 311 Residential real estate 10,935 4,593 15,528 13,360 Home equity 5,427 — 5,427 6,570 Other consumer 156 — 156 61 Total nonaccrual loans (1) $ 31,332 $ 35,528 $ 66,860 $ 45,892 (1) Included in these amounts are $22.2 million and $24.8 million of nonaccruing TDRs at December 31, 2020 and December 31, 2019, respectively.
Foreclosed Residential Real Estate Property	The following table shows information regarding foreclosed residential real estate property at the dates indicated: December 31, 2020 December 31, 2019 (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 $ 1,750 $ 3,294
Financing Receivable, Past Due	The following tables show the age analysis of past due financing receivables at the dates indicated: December 31, 2020 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 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 December 31, 2019 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 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
Financing Receivable, Troubled Debt Restructuring	The following table shows the Company’s total TDRs and other pertinent information at the dates indicated: December 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 16,983 $ 19,599 TDRs on nonaccrual 22,209 24,766 Total TDRs $ 39,192 $ 44,365 Amount of specific reserves associated with TDRs n/a $ 855 Additional commitments to lend to a borrower who has been a party to a TDR $ 263 $ 63
Troubled Debt Restructurings On Financing Receivables Post Modifications	The following table shows the troubled debt restructurings which occurred for the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Year Ended December 31, 2020 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 8 $ 732 $ 732 Commercial real estate 10 2,865 2,865 Small business 10 752 728 Residential real estate 2 559 642 Total 30 $ 4,908 $ 4,967 Year Ended December 31, 2019 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 3 $ 268 $ 268 Commercial real estate 4 819 819 Small business 1 14 14 Residential real estate 3 967 1,009 Home equity 2 121 121 Total 13 $ 2,189 $ 2,231 Year Ended December 31, 2018 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial $ 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total $ 29 $ 38,898 $ 42,457
Troubled Debt Restructurings On Financing Receivables Post Modification	The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the periods indicated: Years Ended December 31 2020 2019 2018 Extended maturity $ 4,120 $ 1,565 $ 2,878 Adjusted interest rate 822 150 57 Combination rate and maturity — 441 38,812 Court ordered concession 25 75 710 Total $ 4,967 $ 2,231 $ 42,457

LOANS, ALLOWANCE FOR LOAN LOS_2

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Tables)	12 Months Ended
	Dec. 31, 2020
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Schedule of Allowance for Loan 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 year ended December 31, 2020: Years Ended December 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 (1) (1,984) (13,048) (3,652) 495 9,828 7,012 212 (1,137) Cumulative effect accounting adjustment (2) 49 337 — — 423 319 29 1,157 Charge-offs (2,309) (3,885) — (380) (105) (142) (1,625) (8,446) Recoveries 289 9 — 33 2 210 1,035 1,578 Provision for credit loss expense 7,447 28,661 2,996 3,201 687 9,085 423 52,500 Ending balance (3) $ 21,086 $ 45,009 $ 5,397 $ 5,095 $ 14,275 $ 22,060 $ 470 $ 113,392 (1) 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. (2) 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. (3) Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $36.0 million at December 31, 2020. The following table bifurcates the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis at December 31, 2019 and 2018: December 31, 2019 Commercial Commercial Commercial Small Residential Home Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Charge-offs (244) (2,614) — (509) — (240) (1,598) (5,205) Recoveries 1,131 152 — 122 142 318 787 2,652 Provision (benefit) 947 3,027 895 377 79 (110) 785 6,000 Ending balance $ 17,594 $ 32,935 $ 6,053 $ 1,746 $ 3,440 $ 5,576 $ 396 $ 67,740 Ending balance: collectively evaluated for impairment $ 17,468 $ 32,887 $ 6,053 $ 1,738 $ 2,803 $ 5,420 $ 391 $ 66,760 Ending balance: individually evaluated for impairment $ 126 $ 48 $ — $ 8 $ 637 $ 156 $ 5 $ 980 Financing receivables ending balance: Collectively evaluated for impairment $ 1,370,580 $ 3,987,848 $ 547,293 $ 173,960 $ 1,571,848 $ 1,127,963 $ 29,663 $ 8,809,155 Individually evaluated for impairment 24,456 8,337 — 537 11,228 4,948 122 49,628 Purchased credit impaired loans — 6,174 — — 7,493 887 302 14,856 Total loans by group $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 1,590,569 $ 1,133,798 $ 30,087 $ 8,873,639 (1) December 31, 2018 Commercial Commercial Commercial Small Residential Other Consumer Total (Dollars in thousands) Allowance for loan losses Beginning balance $ 13,256 $ 31,453 $ 5,698 $ 1,577 $ 2,822 $ 5,390 $ 447 $ 60,643 Charge-offs (355) (82) — (372) (148) (293) (1,347) (2,597) Recoveries 182 188 — 46 12 156 888 1,472 Provision (benefit) 2,677 811 (540) 505 533 355 434 4,775 Ending balance $ 15,760 $ 32,370 $ 5,158 $ 1,756 $ 3,219 $ 5,608 $ 422 $ 64,293 Ending balance: collectively evaluated for impairment $ 15,753 $ 32,333 $ 5,158 $ 1,755 $ 2,357 $ 5,444 $ 414 $ 63,214 Ending balance: individually evaluated for impairment $ 7 $ 37 $ — $ 1 $ 862 $ 164 $ 8 $ 1,079 Financing receivables ending balance: Collectively evaluated for impairment $ 1,064,800 $ 3,235,418 $ 365,165 $ 164,135 $ 906,959 $ 1,085,961 $ 15,901 $ 6,838,339 Individually evaluated for impairment 28,829 10,839 — 541 12,706 5,948 197 59,060 Purchase credit impaired loans — 4,991 — — 3,629 175 — 8,795 Total loans by group $ 1,093,629 $ 3,251,248 $ 365,165 $ 164,676 $ 923,294 $ 1,092,084 $ 16,098 $ 6,906,194 (1) (1) The amount of net deferred costs on originated loans included in the ending balance was $7.1 million at December 31, 2019 and 2018. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance were $21.6 million and $15.2 million at December 31, 2019 and 2018 respectively.
Schedule of Internal Risk-Rating Categories for the Company's Commercial Portfolio	The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year at December 31, 2020: 2020 2019 2018 2017 2016 Prior Revolving Loans Revolving converted to Term Total (Dollars in thousands) Commercial and Pass $ 1,074,773 (1) $ 141,859 $ 97,908 $ 30,431 $ 19,426 $ 19,749 $ 631,049 $ 2,538 $ 2,017,733 Potential weakness 9,020 1,869 670 4,997 1,539 294 20,766 — 39,155 Definite weakness - loss unlikely 2,009 1,310 19,575 2,997 320 429 6,991 — 33,631 Partial loss probable 672 — — — 156 143 11,662 — 12,633 Definite loss — — — — — — — — — Total commercial and industrial $ 1,086,474 $ 145,038 $ 118,153 $ 38,425 $ 21,441 $ 20,615 $ 670,468 $ 2,538 $ 2,103,152 Commercial real estate Pass $ 1,054,345 $ 726,276 $ 480,725 $ 544,826 $ 372,542 $ 664,256 $ 19,085 $ 14,737 $ 3,876,792 Potential weakness 27,877 55,166 30,286 19,531 25,462 71,252 13,610 — 243,184 Definite weakness - loss unlikely 25,878 3,502 3,857 10,185 3,376 7,153 — — 53,951 Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial real estate $ 1,108,100 $ 784,944 $ 514,868 $ 574,542 $ 401,380 $ 742,661 $ 32,695 $ 14,737 $ 4,173,927 Commercial construction Pass $ 255,679 $ 167,948 $ 30,706 $ 32,538 $ — $ 6,689 $ 31,705 $ 588 $ 525,853 Potential weakness 17,528 9,953 520 — — — 75 — 28,076 Definite weakness - loss unlikely — — — — — — — — — Partial loss probable — — — — — — — — — Definite loss — — — — — — — — — Total commercial construction $ 273,207 $ 177,901 $ 31,226 $ 32,538 $ — $ 6,689 $ 31,780 $ 588 $ 553,929 Small business Pass $ 41,713 $ 27,751 $ 19,497 $ 13,411 $ 13,837 $ 19,624 $ 35,451 $ — $ 171,284 Potential weakness — 10 15 15 6 217 822 — 1,085 Definite weakness - loss unlikely 684 438 122 11 137 353 883 — 2,628 Partial loss probable — — — — — — 26 — 26 Definite loss — — — — — — — — — Total small business $ 42,397 $ 28,199 $ 19,634 $ 13,437 $ 13,980 $ 20,194 $ 37,182 $ — $ 175,023 Residential real estate Pass $ 219,595 $ 146,058 $ 160,422 $ 144,638 $ 215,568 $ 401,279 $ — $ — $ 1,287,560 Default — — 427 — 4,158 4,038 — — 8,623 Total residential real estate $ 219,595 $ 146,058 $ 160,849 $ 144,638 $ 219,726 $ 405,317 $ — $ — $ 1,296,183 Home equity Pass $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,360 $ 661,575 $ 4,663 $ 1,066,158 Default — — — — — 440 1,837 355 2,632 Total home equity $ 82,312 $ 59,409 $ 52,088 $ 53,570 $ 41,181 $ 111,800 $ 663,412 $ 5,018 $ 1,068,790 Other consumer Pass $ 816 $ 398 $ 165 $ 665 $ 615 $ 6,749 $ 12,317 $ — $ 21,725 Default — — — 15 — 111 11 — 137 Total other consumer $ 816 $ 398 $ 165 $ 680 $ 615 $ 6,860 $ 12,328 $ — $ 21,862 Total $ 2,812,901 $ 1,341,947 $ 896,983 $ 857,830 $ 698,323 $ 1,314,136 $ 1,447,865 $ 22,881 $ 9,392,866 (1) Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are reported as commercial and industrial under the 2020 vintage year and as"Pass" because these loans are 100% guaranteed by the U.S. Government. Funded PPP loans outstanding totaled $791.9 million at December 31, 2020. December 31 December 31 Residential portfolio FICO score (re-scored)(1) 749 749 LTV (re-valued)(2) 57.4 % 59.0 % Home equity portfolio FICO score (re-scored)(1) 771 767 LTV (re-valued)(2)(3) 46.0 % 46.6 % (1) The average FICO scores at December 31, 2020 are based upon rescores from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020. The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019. (2) The combined LTV ratios for December 31, 2020 are based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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. The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio: December 31, 2019 Category Risk Commercial and Commercial Real Commercial Small Business Total (Dollars in thousands) Pass 1 - 6 $ 1,274,155 $ 3,860,555 $ 542,608 $ 171,213 $ 5,848,531 Potential weakness 7 63,485 97,268 2,247 1,416 164,416 Definite weakness - loss unlikely 8 57,396 44,536 2,438 1,868 106,238 Partial loss probable 9 — — — — — Definite loss 10 — — — — — Total $ 1,395,036 $ 4,002,359 $ 547,293 $ 174,497 $ 6,119,185
Foreclosed Residential Real Estate Property	The following table shows information regarding foreclosed residential real estate property at the dates indicated: December 31, 2020 December 31, 2019 (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 $ 1,750 $ 3,294
Schedule of the Age Analysis of Past Due Financing Receivables	The following tables show the age analysis of past due financing receivables at the dates indicated: December 31, 2020 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 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 December 31, 2019 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 1 $ 253 2 $ 323 5 $ 760 8 $ 1,336 $ 1,393,700 $ 1,395,036 $ — Commercial real estate 7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2) Commercial construction 1 560 — — — — 1 560 546,733 547,293 — Small business 11 837 3 15 6 115 20 967 173,530 174,497 — Residential real estate 17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2) Home equity 23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2) Other consumer (1) 387 245 12 44 16 32 415 321 29,766 30,087 22 Total 447 $ 7,511 43 $ 4,155 113 $ 13,819 603 $ 25,485 $ 8,848,154 $ 8,873,639 $ 2,157 (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2) Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
Schedule of Troubled Debt Restructuring and Other Pertinent Information	The following table shows the Company’s total TDRs and other pertinent information at the dates indicated: December 31, 2020 December 31, 2019 (Dollars in thousands) TDRs on accrual status $ 16,983 $ 19,599 TDRs on nonaccrual 22,209 24,766 Total TDRs $ 39,192 $ 44,365 Amount of specific reserves associated with TDRs n/a $ 855 Additional commitments to lend to a borrower who has been a party to a TDR $ 263 $ 63
Schedule of Post-Modification Balance of Troubled Debt Restructuring by Type of Modification	The following table shows the troubled debt restructurings which occurred for the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Year Ended December 31, 2020 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 8 $ 732 $ 732 Commercial real estate 10 2,865 2,865 Small business 10 752 728 Residential real estate 2 559 642 Total 30 $ 4,908 $ 4,967 Year Ended December 31, 2019 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 3 $ 268 $ 268 Commercial real estate 4 819 819 Small business 1 14 14 Residential real estate 3 967 1,009 Home equity 2 121 121 Total 13 $ 2,189 $ 2,231 Year Ended December 31, 2018 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial $ 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total $ 29 $ 38,898 $ 42,457
Schedule of Impaired Loans by Loan Portfolio	As of and For the Years Ended December 31 2019 Recorded Unpaid Related Average Interest (Dollars in thousands) With no related allowance recorded Commercial and industrial $ 23,786 $ 34,970 $ — $ 27,056 $ 136 Commercial real estate 6,213 12,101 — 12,595 523 Small business 469 484 — 471 22 Residential real estate 4,976 5,123 — 5,045 222 Home equity 3,764 3,893 — 3,869 184 Other consumer 34 34 — 41 3 Subtotal 39,242 56,605 — 49,077 1,090 With an allowance recorded Commercial and industrial 670 670 126 718 29 Commercial real estate 2,124 2,124 48 2,176 122 Small business 68 105 8 74 2 Residential real estate 6,252 7,163 637 6,326 239 Home equity 1,184 1,382 156 1,214 52 Other consumer 88 91 5 97 3 Subtotal 10,386 11,535 980 10,605 447 Total $ 49,628 $ 68,140 $ 980 $ 59,682 $ 1,537
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Table Text Block]	The following table summarizes activity in the accretable yield for the PCI loan portfolio for the year ended December 31, 2019: 2019 (Dollars in thousands) Beginning balance $ 1,191 Acquisition 1,464 Accretion (1,751) Other change in expected cash flows (1) 803 Reclassification from nonaccretable difference for loans which have paid off (2) 227 Ending balance $ 1,934 (1) Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).	[1]
[1]	Results in increased income during the period when a loan pays off at amount greater than originally expected.

BANK PREMISES AND EQUIPMENT (Ta

BANK PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Bank premises and equipment at December 31, were as follows: 2020 2019 Estimated (Dollars in thousands) (In years) Cost Land $ 32,450 $ 32,619 n/a Bank premises 63,544 62,455 5-40 Leasehold improvements 38,667 35,498 1-27 Furniture and equipment 81,815 77,705 2-12 Leased equipment — 10,644 7 Total cost 216,476 218,921 Accumulated depreciation (100,083) (95,247) Net bank premises and equipment $ 116,393 $ 123,674

GOODWILL AND IDENTIFIABLE INT_2

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31: 2020 2019 (Dollars in thousands) Balances not subject to amortization Goodwill $ 506,206 $ 506,206 Balances subject to amortization Core deposit intangibles 22,215 28,016 Other intangible assets 892 1,270 Total other intangible assets 23,107 29,286 Total goodwill and other intangible assets $ 529,313 $ 535,492
Schedule of Goodwill	The changes in the carrying value of goodwill for the periods indicated were as follows: 2020 2019 (Dollars in thousands) Balance at beginning of year $ 506,206 $ 256,105 Acquisitions — 250,101 Balance at end of year $ 506,206 $ 506,206
Schedule of Other Intangible Assets	The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated: December 31 2020 2019 Gross Accumulated Net Gross Accumulated Net (Dollars in thousands) Core deposit intangibles $ 38,620 $ (16,405) $ 22,215 $ 45,245 $ (17,229) $ 28,016 Other intangible assets 2,434 (1,542) 892 3,338 (2,068) 1,270 Total $ 41,054 $ (17,947) $ 23,107 $ 48,583 $ (19,297) $ 29,286
Schedule of Intangible Assets Estimated Annual Amortization Expense	The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years: Year Amount (Dollars in thousands) 2021 $ 5,315 2022 $ 4,539 2023 $ 3,948 2024 $ 3,162 2025 $ 2,329

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Schedule of Time Deposits Maturities	The following is a summary of the scheduled maturities of time deposits at December 31: 2020 2019 (Dollars in thousands) 1 year or less $ 789,237 83.0 % $ 1,097,407 78.6 % Over 1 year to 2 years 93,727 9.9 % 204,690 14.7 % Over 2 years to 3 years 36,739 3.9 % 55,615 4.0 % Over 3 years to 4 years 13,407 1.4 % 24,038 1.7 % Over 4 years to 5 years 17,519 1.8 % 13,565 1.0 % Total $ 950,629 100.0 % $ 1,395,315 100.0 %

BORROWINGS (Tables)

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Federal Home Loan Bank Borrowings	Advances payable to the Federal Home Loan Bank at December 31, 2020 and 2019 were as follows: 2020 2019 Weighted Weighted Average Average Total Contractual Total Contractual Outstanding Rate Outstanding Rate (Dollars in thousands) Stated Maturity 2020 $ — — % $ 104,976 1.79 % 2021 35,042 1.12 % 10,042 2.95 % Subtotal 35,042 1.12 % 115,018 1.89 % Amortizing advances 698 730 Total Federal Home Loan Bank Advances $ 35,740 $ 115,748
Schedule of Long-term Borrowings	The following table summarizes long-term debt, net of debt issuances costs, at the dates indicated: December 31 2020 2019 (Dollars in thousands) Long term borrowings, net $ 32,773 $ 74,906 Junior subordinated debentures Capital Trust V 51,510 51,507 Central Trust I 5,258 5,258 Central Trust II 6,083 6,083 Subordinated debentures 49,696 49,601 Total long-term debt $ 145,320 $ 187,355
Information relating to Trust Preferred Securities [Table Text Block]	Information relating to these trust preferred securities is as follows: Trust Description of Capital Securities Capital Trust V $50.0 million due in 2037, interest at a variable rate of 3 month LIBOR plus 1.48% (1.70% at December 31, 2020),which, effective on January 17, 2017, has been converted to a fixed rate of 2.84% through the use of an interest rate swap. Central Trust I $5.1 million due in 2034, bearing interest at a variable rate of 3 month LIBOR plus 2.44% (2.66% at December 31, 2020). These securities are callable quarterly, until maturity. Central Trust II $5.9 million due in 2037, bearing interest at a variable rate of 3 month LIBOR plus 1.65% (1.87% at December 31, 2020). These securities are callable quarterly, until maturity.
Schedule of Maturities of Borrowings	The following table sets forth the contractual maturities of long-term debt over the next five years: 2021 2022 2023 2024 2025 Thereafter Total (Dollars in thousands) Long term borrowings $ 18,750 $ 14,023 $ — $ — $ — $ — $ 32,773 Junior subordinated debentures Capital trust V — — — — — 51,547 51,547 Central trust I — — — — — 5,258 5,258 Central trust II — — — — — 6,083 6,083 Subordinated debentures — — — — — 50,000 50,000 Total (1) $ 18,750 $ 14,023 $ — $ — $ — $ 112,888 $ 145,661 (1) Amounts in this table are presented on a gross basis, and do not include the capitalized issuance costs as presented in the Company's Consolidated Balance Sheet.

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of the Components of Earnings Per Share	Earnings per share consisted of the following components for the years ended December 31: 2020 2019 2018 (Dollars in thousands, except per share data) Net income $ 121,167 $ 165,175 $ 121,622 Weighted Average Shares Basic shares 33,259,643 32,810,433 27,592,380 Effect of dilutive securities 25,646 45,801 61,428 Diluted shares 33,285,289 32,856,234 27,653,808 Net income per share Basic EPS $ 3.64 $ 5.03 $ 4.41 Effect of dilutive securities — — (0.01) Diluted EPS $ 3.64 $ 5.03 $ 4.40

STOCK BASED COMPENSATION (Table

STOCK BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Cumulatively Granted Stock Options and Restricted Stock Awards, Net of Forfeitures and Expirations	The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, granted through December 31, 2020: Authorized Awards Cumulatively Granted, Net of Total Authorized Stock Restricted 2005 Plan 1,650,000 387,258 863,861 1,251,119 398,881 2010 Plan 314,600 46,500 93,245 139,745 — (1) 2018 Plan 300,000 — 21,938 21,938 278,062 (1)
Schedule of Pre-tax Compensation Expense and Related Tax Benefits	The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Stock based compensation expense Restricted stock awards (1) $ 3,272 $ 3,679 $ 3,299 Directors’ fee expense (2) Stock options — 23 66 Restricted stock awards 851 701 860 Total stock based award expense $ 4,123 $ 4,403 $ 4,225 Related tax benefits recognized in earnings $ 1,159 $ 1,238 $ 1,188 (1) Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards. (2) Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense.
Schedule of Stock Options Granted	The following table presents the awards granted by the Company of nonqualified options to purchase shares of common stock for the periods presented: Year Ended December 31 2018 Date of grant 4/3/2018 Plan 2010 Options granted 5,000 Vesting period (beginning on the grant date) 21 months Expiration date 4/3/2028 Expected volatility 21.15 % Expected life (years) 5.5 Expected dividend yield 1.94 % Risk free interest rate 2.62 % Fair value per option $ 13.46
Schedule of Relevant Information Relating to Stock Options	The following table presents relevant information relating to the Company’s stock options for the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands, except per share data) Fair value of stock options vested based on grant date fair value $ 22 $ 21 $ 85 Intrinsic value of stock options exercised $ 404 $ 883 $ 1,525 Cash received from stock option exercises $ 279 $ 396 $ 1,024 Tax benefit realized on stock option exercises $ 114 $ 248 $ 429 Weighted average grant date fair value of options granted (per share) n/a n/a $ 13.46
Schedule of Stock Options	The following table presents a summary of stock option award activity for the year ended December 31, 2020: Outstanding Nonvested Stock Option Weighted Weighted Aggregate Stock Weighted (Dollars in thousands, except per share data) Balance at January 1, 2020 38,500 $ 42.49 1,666 $ 13.46 Granted — — — — Exercised (10,000) 27.90 n/a n/a Vested n/a n/a (1,666) 13.46 Forfeited — — — — Expired — — — — Balance at December 31, 2020 28,500 (2) $ 47.61 3.99 years $ 704 — $ — Options outstanding, vested, and exercisable at December 31, 2020 28,500 (2) $ 47.61 3.99 years $ 704 (1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2020 of $72.33, which would have been received by in-the-money option holders had they all exercised their options as of that date. (2) Inclusive of 20,000 vested stock options outstanding to Directors. For the year ended December 31, 2020, all outstanding stock option awards are vested and there is no unrecognized compensation expense related to those options.
Schedule of Restricted Stock Granted	During the years ended December 31, 2020, 2019, and 2018 the Company made the following restricted stock award grants: Shares Granted Plan Fair Value (1) Vesting Period Time-vested 2020 2/27/2020 46,550 2005 $ 70.24 Ratably over 5 years from grant date 4/15/2020 880 2005 $ 70.02 Ratably over 5 years from grant date 5/27/2020 9,438 2018 $ 72.86 Immediately upon grant date 2019 2/21/2019 43,250 2005 $ 83.87 Ratably over 5 years from grant date 3/15/2019 600 2005 $ 79.55 Ratably over 5 years from grant date 4/1/2019 1,090 2005 $ 82.62 Ratably over 3 years from grant date 5/21/2019 6,500 2018 $ 77.08 Immediately upon grant date 2018 2/15/2018 39,950 2005 $ 71.75 Ratably over 5 years from grant date 2/27/2018 1,150 2005 $ 72.60 Ratably over 5 years from grant date 5/15/2018 530 2005 $ 74.00 Ratably over 5 years from grant date 5/22/2018 6,000 2018 $ 76.58 Immediately upon grant date 11/15/2018 560 2005 $ 77.78 Ratably over 5 years from grant date Performance-based 2/27/2020 17,100 2005 $ 70.24 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2023. 2/21/2019 15,900 2005 $ 83.87 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2022. 2/15/2018 16,300 2005 $ 71.75 The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021. (1) The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.
Schedule of Share-based Compensation, Fair Value of Restricted Stock Awards Vesting [Table Text Block]	The following table presents the fair value of restricted stock awards that vesting during the periods presented: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Fair value of restricted stock awards upon vesting $ 5,580 $ 6,005 $ 6,277
Schedule of Restricted Stock Awards	The following table presents a summary of restricted stock award activity for the year ended December 31, 2020: Outstanding Restricted Stock Weighted Average (Dollars in thousands, except per share data) Balance at January 1, 2020 193,784 $ 67.45 Granted 73,968 70.55 Vested/released (75,197) 60.34 Forfeited (11,050) 70.69 Balance at December 31, 2020 181,505 (1) $ 71.46 Unrecognized compensation cost (inclusive of directors’ fees) $ 7,787 Weighted average remaining recognition period (years) 2.96 (1) Inclusive of 10,300 restricted stock awards outstanding to Directors.

DERIVATIVES AND HEDGING ACTIVIT

DERIVATIVES AND HEDGING ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes	The following table reflects information about the Company’s derivative positions at the dates indicated below for interest rate swaps which qualify as cash flow hedges for accounting purposes: December 31, 2020 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (1) (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 December 31, 2019 Weighted Average Rate Notional Amount Weighted Average Maturity Current Pay Fixed Fair Value (1) (in thousands) (in years) (in thousands) Interest rate swaps on borrowings $ 75,000 2.18 1.90 % 1.53 % $ 140 Current Rate Paid Receive Fixed Interest rate swaps on loans 450,000 3.66 1.76 % 2.37 % 12,907 Current Rate Paid Receive Fixed Swap Rate Interest rate collars on loans 400,000 3.66 1.76 % 2.73% - 2.20% 9,896 Total $ 925,000 $ 22,943
Summary of customer related derivative positions, not designated as hedging	The following table reflects the Company’s customer related derivative positions at the dates indicated below for those derivatives not designated as hedging: Number of Notional Amount Maturing Less than 1 year Less than 2 years Less than 3 years Less than 4 years Thereafter Total Fair Value (2) 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) December 31, 2019 (Dollars in thousands) Loan level swaps Receive fixed, pay variable 299 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ 48,596 Pay fixed, receive variable 290 $ 156,690 $ 125,203 $ 85,603 $ 165,599 $ 1,044,315 $ 1,577,410 $ (48,591) Foreign exchange contracts Buys foreign currency, sells U.S. currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ (81) Buys U.S. currency, sells foreign currency 40 $ 91,434 $ — $ — $ — $ — $ 91,434 $ 123 (1) The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements. (2) Beginning in 2020, the Company made an election to include accrued interest within fair value balances.
Fair value of derivative financial instruments as well as their classification on the balance sheet	Asset Derivatives (1) Liability Derivatives (2) Fair Value at Fair Value at Fair Value at Fair Value at December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 (Dollars in thousands) Derivatives designated as hedges Interest rate derivatives $ 48,786 (3) $ 23,140 (3) $ 1,342 (4) $ 197 (4) Derivatives not designated as hedges Customer Related Positions: Loan level derivatives 127,228 (3) 52,374 (3) 127,218 (4) 52,369 (4) Foreign exchange contracts 4,359 1,191 4,349 1,149 Risk participation agreements 513 — 119 — Mortgage Derivatives Interest rate lock commitments 6,513 1,680 — — Forward sale loan commitments — — 1 12 Forward sale hedge commitments — — 1,035 196 Total derivatives not designated as hedges 138,613 55,245 132,722 53,726 Total 187,399 78,385 134,064 53,923 Netting Adjustments (5) 23 — 16,105 — Net Derivatives on the Balance Sheet 187,422 78,385 117,959 53,923 Financial instruments (6) 48,786 24,882 48,786 24,882 Cash collateral pledged (received) — — 62,460 25,493 Net Derivative Amounts $ 138,636 $ 53,503 $ 6,713 $ 3,548 (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 $2.0 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2020. Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2019. (4) Approximately $81,000 and $2.0 million of accrued interest payable is included in the fair value of interest rate and loan level derivative liabilities as of December 31, 2020. Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, at December 31, 2019. (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 at December 31, 2020. (6) Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.
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: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Derivatives designated as hedges Gain in OCI on derivatives (effective portion), net of tax $ 16,797 $ 10,331 $ 4,829 Gain reclassified from OCI into interest income or interest expense (effective portion) $ 14,306 $ 2,346 $ 1,000 Loss reclassified from OCI into noninterest expense (loss on termination) $ (684) $ — $ — Interest expense $ — $ — $ — Other expense — — — Total $ — $ — $ — Derivatives not designated as hedges Changes in fair value of customer related positions Other income $ 90 $ 39 $ 46 Other expenses (199) (18) (29) Changes in fair value of mortgage derivatives Mortgage banking income 4,005 1,275 39 Total $ 3,896 $ 1,296 $ 56

BALANCE SHEET OFFSETTING (Table

BALANCE SHEET OFFSETTING (Tables)	12 Months Ended
	Dec. 31, 2020
Offsetting [Abstract]
Financial Instruments Derivative Assets Liabilities and resell agreements net of amount not offset [Table Text Block]	BALANCE SHEET OFFSETTING The Company does not offset fair value amounts recognized for derivative instruments or repurchase agreements. 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. The following tables present the Company's asset and liability derivative positions and the potential effect of netting arrangements on its financial position, as of the dates indicated: Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2020 (Dollars in thousands) Derivative Assets Interest rate swaps $ 47,576 $ — $ 47,576 $ — $ — $ 47,576 Loan level derivatives 125,242 — 125,242 — — 125,242 Customer foreign exchange contracts 4,359 — 4,359 — — 4,359 $ 177,177 $ — $ 177,177 $ — $ — $ 177,177 Derivative Liabilities Interest rate swaps $ 1,261 $ — $ 1,261 $ — $ — $ 1,260 Loan level derivatives 125,232 — 125,232 — — 125,232 Customer foreign exchange contracts 4,349 — 4,349 — — 4,349 $ 130,842 $ — $ 130,842 $ — $ — $ 130,842 (1) Reflects offsetting derivative positions with the same counterparty. Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts Recognized in the Statement of Financial Position Gross Amounts Offset in the Statement of Financial Position Net Amounts Presented in the Statement of Financial Position Financial Instruments (1) Collateral Pledged (Received) Net Amount December 31, 2019 (Dollars in thousands) Derivative Assets Interest rate swaps $ 23,140 $ — $ 23,140 $ 23,140 $ — $ — Loan level derivatives 52,374 — 52,374 1,742 — 50,632 Customer foreign exchange contracts 1,191 — 1,191 — — 1,191 $ 76,705 $ — $ 76,705 $ 24,882 $ — $ 51,823 Derivative Liabilities Interest rate swaps $ 197 $ — $ 197 $ — $ 197 $ — Loan level derivatives 52,369 — 52,369 24,882 25,296 2,191 Customer foreign exchange contracts 1,149 — 1,149 — — 1,149 $ 53,715 $ — $ 53,715 $ 24,882 $ 25,493 $ 3,340 (1) Reflects offsetting derivative positions with the same counterparty.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Components of Income Taxes	The provision for income taxes is comprised of the following components: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Current expense Federal $ 32,171 $ 27,980 $ 25,129 State 17,004 14,359 13,672 Total current expense 49,175 42,339 38,801 Deferred expense (benefit) Federal (10,872) 9,080 (3,080) State (6,634) 1,514 (1,417) Total deferred expense (benefit) (17,506) 10,594 (4,497) Total expense $ 31,669 $ 52,933 $ 34,304
Schedule of Income Tax Rate Reconciliation	The difference between the statutory federal income tax rate and the effective income tax rate reported for the last three years is detailed below: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Computed statutory federal income tax provision $ 32,096 21.00 % $ 45,803 21.00 % $ 32,744 21.00 % State taxes, net of federal tax benefit 8,147 5.33 % 12,262 5.63 % 9,633 6.18 % CARES Act - net operating loss carryback (4,809) (3.15) % — — % — — % Low Income Housing Project Investments (1,851) (1.21) % (1,696) (0.78) % (1,030) (0.66) % Increase in cash surrender value of life insurance (1,345) (0.88) % (1,144) (0.52) % (1,160) (0.74) % Stock-based compensation (1,067) (0.70) % (824) (0.38) % (885) (0.57) % Nontaxable interest, net (723) (0.47) % (757) (0.35) % (566) (0.36) % Change in valuation allowance — — % 17 0.01 % 49 0.03 % New Markets Tax Credits — — % (2,675) (1.23) % (3,960) (2.54) % Merger and other related costs (non-deductible) — — % 582 0.27 % 130 0.08 % Other, net 1,221 0.80 % 1,365 0.63 % (651) (0.42) % Total expense $ 31,669 20.72 % $ 52,933 24.28 % $ 34,304 22.00 %
Schedule of Net Deferred Tax Asset	The tax-effected components of the net deferred tax asset at December 31 of the years presented were as follows: 2020 2019 (Dollars in thousands) Deferred tax assets Accrued expenses not deducted for tax purposes $ 13,804 $ 13,855 Allowance for credit losses 32,265 18,993 Employee and director equity compensation 1,548 1,708 Foreign Tax Credit Carryforward 89 — Loan basis difference fair value adjustment 4,791 6,804 Net operating loss carry-forward 226 2,546 Operating lease liability 15,846 16,393 Other 999 1,311 Gross deferred tax assets $ 69,568 $ 61,610 Valuation allowance (280) (187) Total deferred tax assets net of valuation allowance $ 69,288 $ 61,423 Deferred tax liabilities Core deposit and other intangibles $ 4,344 $ 5,802 Deferred loan fees, net 336 4,944 Derivatives fair value adjustment 13,036 6,461 Fixed assets 7,786 8,194 Goodwill 10,947 10,645 Net unrealized gain on securities available for sale 4,152 — Prepaid pension 3,404 3,487 Right of use asset 12,979 15,911 Other 1,573 3,965 Gross deferred tax liabilities $ 58,557 $ 59,409 Total net deferred tax asset $ 10,731 $ 2,014
Reconciliation of Unrecognized Tax Benefits	The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits: (Dollars in thousands) Balance at December 31, 2018 $ 215 Reduction of tax positions for prior years (127) Increase for current year tax positions 444 Balance at December 31, 2019 532 Reduction of tax positions for prior years (58) Balance at December 31, 2020 $ 474

LOW INCOME HOUSING PROJECT IN_2

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Tables)	12 Months Ended
	Dec. 31, 2020
Low Income Housing Project Investments [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 December 31 of the years presented: 2020 2019 2018 (Dollars in thousands) Original investment value $ 128,752 $ 96,275 $ 50,232 Current recorded investment $ 97,435 $ 72,510 $ 33,681 Unfunded liability obligation $ 49,586 $ 34,967 $ 3,935 Tax credits and benefits earned during the year $ 9,404 $ 7,342 $ 5,407 Amortization of investments during the year (1) $ 7,552 $ 5,645 $ 4,377 Net income tax benefit recognized during the year $ 1,851 $ 1,696 $ 1,030

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Schedule of Expected Benefit Payments [Table Text Block]	Estimated future benefit payments for the BHB Plan are presented below: Amount (Dollars in thousands) 2021 $ 843 2022 $ 628 2023 $ 635 2024 $ 566 2025 $ 567 2026-2030 $ 2,837 Expected future benefit payments for the defined benefit supplemental executive retirement plans are presented below: Defined Benefit Supplemental Executive (Dollars in thousands) 2021 $ 472 2022 $ 464 2023 $ 576 2024 $ 1,224 2025 $ 1,214 2026-2030 $ 5,921
Schedule of Multiemployer Plan	Funding Status FIP/RP Status Surcharge Expiration Minimum EIN/Pension 2020 2019 Pentegra defined benefit plan for financial institutions 13-5645888/333 At least 80 percent At least 80 percent No No N/A $ —
Schedule of Multiemployer Plan Contributions	The Company’s contributions to the Pension Plans were as follows for the periods indicated: Required Contributions - Plan Year Allocation Cash Payment Future period funding 2020-2021 2019-2020 2018-2019 (Dollars in thousands) 2020 $ 929 $ — $ 929 $ — $ — 2019 $ 2,063 $ — $ — $ 2,063 $ — 2018 $ 2,642 $ 2,000 $ — $ — $ 642
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	Information pertaining to the BHB Plan is as follows: Years Ended December 31 2020 2019 (Dollars in thousands) Change in plan assets: Fair value of plan assets at beginning of year $ 11,653 $ 9,697 Actual return on plan assets 1,333 1,886 Employer contribution — 505 Benefits paid (761) (435) Settlement payments — — Fair value of plan assets at end of year $ 12,225 $ 11,653 Change in benefit obligation: Benefit obligation at beginning of year 13,687 10,824 Interest cost 416 424 Actuarial loss 1,710 2,874 Benefits paid (761) (435) Settlement payments — — Benefit obligation at end of year $ 15,052 $ 13,687 Funded status and accrued liability at end of year $ (2,827) $ (2,034) Accumulated benefit obligation at end of year $ 15,052 $ 13,687
Schedule of Net Benefit Costs [Table Text Block]	Years Ended December 31 2020 2019 (Dollars in thousands) Interest cost $ 416 $ 424 Expected return on plan assets (908) (780) Amortization of net actuarial loss 541 327 Settlement loss 176 — Net period pension cost (benefit) $ 225 $ (29)
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block]	The fair value of major categories of the BHB Plan assets are summarized below: Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2020 (Dollars in thousands) Collective funds $ 1,300 1,300 $ — $ — Equity securities 3,239 3,239 — — Mutual funds 1,506 1,506 — — Total investments in the fair value hierarchy $ 6,045 $ 6,045 $ — $ — Investments measured at net asset value (1) 6,180 $ 12,225 Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2019 (Dollars in thousands) Collective funds $ 967 967 $ — $ — Equity securities 1,131 1,131 — — Mutual funds 3,628 3,628 — — Total investments in the fair value hierarchy $ 5,726 $ 5,726 $ — $ — Investments measured at net asset value (1) 5,927 $ 11,653 (1) Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.
Schedule of Supplemental Retirement Expense and Contributions Paid	The following table shows the defined benefit supplemental retirement expense, and the contributions paid to the plans which were used only to pay the current year benefits for the years indicated: 2020 2019 2018 (Dollars in thousands) Retirement expense $ 1,770 $ 1,356 $ 1,683 Contributions paid $ 475 $ 486 $ 434
Schedule of Supplemental Executive Retirement Plans	The following table illustrates the status of the defined benefit supplemental executive retirement plans at December 31 for the years presented: Defined Benefit Supplemental Executive 2020 2019 2018 (Dollars in thousands) Change in accumulated benefit obligation Benefit obligation at beginning of year $ 17,361 $ 14,963 $ 15,749 Service cost 505 433 459 Interest cost 518 601 533 Actuarial loss (gain) 2,843 1,850 (1,344) Benefits paid (475) (486) (434) Benefit obligation at end of year $ 20,752 $ 17,361 $ 14,963 Change in plan assets Fair value of plan assets at beginning of year $ — $ — $ — Employer contribution 475 486 434 Benefits paid (475) (486) (434) Fair value of plan assets at end of year $ — $ — $ — Funded status at end of year $ (20,752) $ (17,361) $ (14,963) Assets — — — Liabilities (20,752) (17,361) (14,963) Funded status at end of year $ (20,752) $ (17,361) $ (14,963) Amounts recognized in accumulated other comprehensive income ("AOCI") Net loss $ 5,881 $ 3,509 $ 1,705 Prior service cost 218 494 770 Amounts recognized in AOCI $ 6,099 $ 4,003 $ 2,475 Information for plans with an accumulated benefit obligation in excess of plan assets Projected benefit obligation $ 20,752 $ 17,361 $ 14,963 Accumulated benefit obligation $ 20,752 $ 17,361 $ 14,963 Net periodic benefit cost Service cost $ 505 $ 433 $ 459 Interest cost 518 601 533 Amortization of prior service cost 276 276 276 Recognized net actuarial loss 471 46 415 Net periodic benefit cost $ 1,770 $ 1,356 $ 1,683 Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year Net actuarial loss $ 471 $ 471 $ 41 Net prior service cost $ 276 $ 276 $ 276 Discount rate used for benefit obligation 0.43 - 2.18% 2.00 - 3.04% 3.24 - 4.09% Discount rate used for net periodic benefit cost 2.00 - 3.04% 3.24 - 4.09% 2.48 - 3.45% Rate of compensation increase n/a n/a n/a

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis	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 Significant Other 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 $ 523,243 $ 1,056 Nonrecurring fair value measurements Assets Individually assessed collateral dependent loans $ 31,510 $ — $ — $ 31,510 Total nonrecurring fair value measurements $ 31,510 $ — $ — $ 31,510
Reconciliation of Assets on Recurring Basis Using Significant Unobservable Inputs	All assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were valued using pricing models and discounted cash flow methodologies, as of December 31, 2020, 2019 and 2018. This reconciliation is presented in the table below for the periods indicated: 2020 2019 2018 (Dollars in thousands) Pooled Trust Preferred Securities Beginning balance $ 1,114 $ 1,329 $ 1,640 Gain and (losses) (realized/unrealized) Included in other comprehensive income — (26) 191 Settlements (58) (189) (502) Ending Balance $ 1,056 $ 1,114 $ 1,329
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table sets forth certain unobservable inputs regarding the Company's financial instruments that are classified as Level 3 as of December 31st of the years indicated: Valuation Technique Fair Value Unobservable Inputs Range Weighted Average 2020 2019 2020 2019 2020 2019 (Dollars in thousands) Discounted cash flow methodology Pooled trust preferred securities $ 1,056 $ 1,114 Cumulative prepayment 0% - 55% 0% - 57% 2.4% 2.6% Cumulative default 4% - 100% 2% - 100% 11.8% 13.5% Loss given default 85% - 100% 85% - 100% 94.0% 93.6% Cure given default 0% - 75% 0% - 75% 60.9% 60.9% Appraisals of collateral (1) Individually assessed collateral dependent loans $ 31,510 n/a Collateral dependent impaired loans n/a $ 25,515 (1) Fair value 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.
Schedule of Fair Values and Related Carrying Amounts by Balance Sheet Grouping	he 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 Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 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 Fair Value Measurements at Reporting Date Using Carrying Value Fair Value Quoted Significant Other Significant December 31, 2019 Financial assets (Dollars in thousands) Securities held to maturity (a) U.S. government agency securities $ 12,874 $ 12,997 $ — $ 12,997 $ — U.S. Treasury securities 4,032 4,053 — 4,053 — Agency mortgage-backed securities 397,414 405,802 — 405,802 — Agency collateralized mortgage obligations 293,662 297,314 — 297,314 — Single issuer trust preferred securities issued by banks 1,500 1,490 — 1,490 — Small business administration pooled securities 31,324 31,607 — 31,607 — Loans, net of allowance for loan losses (b) 8,780,384 8,613,635 — — 8,613,635 Federal Home Loan Bank stock (c) 14,424 14,424 — 14,424 — Cash surrender value of life insurance policies (d) 197,372 197,372 — 197,372 — Financial liabilities Deposit liabilities, other than time deposits (e) $ 7,752,052 $ 7,752,052 $ — $ 7,752,052 $ — Time certificates of deposits (f) 1,395,315 1,396,760 — 1,396,760 — Federal Home Loan Bank borrowings (f) 115,748 115,881 — 115,881 — Long-term borrowings (f) 74,906 72,219 — 72,219 — Junior subordinated debentures (g) 62,848 65,603 — 65,603 — Subordinated debentures (f) 49,601 52,870 — — 52,870 (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 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 (Tables)

REVENUE RECOGNITION (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents the revenue streams that the Company has disaggregated for the periods indicated: Years Ended December 31 2020 2019 2018 (Dollars in thousands) Deposit account fees (inclusive of cash management fees) $ 15,121 $ 20,040 $ 18,327 Interchange fees 12,564 18,262 15,433 ATM fees 2,476 3,224 2,961 Investment management - wealth management and advisory services 27,157 25,940 23,441 Investment management - retail investments and insurance revenue 2,275 2,779 2,714 Merchant processing income 1,299 1,175 1,401 Credit card income 778 — — Other noninterest income 4,235 8,696 4,432 Total noninterest income in-scope of ASC 606 65,905 80,116 68,709 Total noninterest income out-of-scope of ASC 606 45,535 35,178 19,796 Total noninterest income $ 111,440 115,294 $ 88,505
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: December 31, 2020 December 31, 2019 (Dollars in thousands) Receivables, included in other assets $ 4,636 $ 2,341

OTHER COMPREHENSIVE LOSS (Table

OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Other Comprehensive Loss	The following table presents 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): Year Ended December 31, 2020 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 11,686 $ (2,829) $ 8,857 Less: net security losses reclassified into other noninterest expense — — — Net change in fair value of securities available for sale 11,686 (2,829) 8,857 Change in fair value of cash flow hedges 36,994 (10,406) 26,588 Less: net cash flow hedge gains reclassified into interest income or interest expense 14,306 (4,023) 10,283 Less: loss on termination of hedge reclassified into noninterest expense (684) 192 (492) Net change in fair value of cash flow hedges 23,372 (6,575) 16,797 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (5,785) 1,627 (4,158) Amortization of net actuarial losses 982 (276) 706 Amortization of net prior service costs 276 (78) 198 Amortization of net settlement costs 176 (50) 126 Net change in other comprehensive income for defined benefit postretirement plans (2) (4,351) 1,223 (3,128) Total other comprehensive income $ 30,707 $ (8,181) $ 22,526 Year Ended December 31, 2019 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ 12,055 $ (2,761) $ 9,294 Less: net security losses reclassified into other noninterest expense (1,462) 411 (1,051) Net change in fair value of securities available for sale 13,517 (3,172) 10,345 Change in fair value of cash flow hedges 16,725 (4,708) 12,017 Less: net cash flow hedge gains reclassified into interest income or interest expense 2,346 (660) 1,686 Net change in fair value of cash flow hedges 14,379 (4,048) 10,331 Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period (2,123) 597 (1,526) Amortization of net actuarial gains (8) 2 (6) Amortization of net prior service costs 276 (78) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) (1,855) 521 (1,334) Total other comprehensive income $ 26,041 $ (6,699) $ 19,342 Year Ended December 31, 2018 Pre Tax Tax (Expense) After Tax (Dollars in thousands) Change in fair value of securities available for sale $ (5,923) $ 1,422 $ (4,501) Less: net security gains reclassified into other noninterest income (expense) — — — Net change in fair value of securities available for sale (5,923) 1,422 (4,501) Change in fair value of cash flow hedges 7,717 (2,169) 5,548 Less: net cash flow hedge gains reclassified into interest income or interest expense (1) 1,000 (281) 719 Net change in fair value of cash flow hedges 6,717 (1,888) 4,829 Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period 1,521 (428) 1,093 Amortization of net actuarial losses 372 (105) 267 Amortization of net prior service costs 276 (78) 198 Net change in other comprehensive income for defined benefit postretirement plans (2) 2,169 (611) 1,558 Total other comprehensive income $ 2,963 $ (1,077) $ 1,886 (1) Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, was recognized in earnings through December 2018, the original maturity date of the swap. (2) The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax	Information on the Company's accumulated other comprehensive income (loss), net of tax, was comprised of the following components for the periods indicated: Unrealized Gain (Loss) on Securities Unrealized Gain (Loss) on Cash Flow Hedge Deferred Gain on Hedge Transactions Defined Benefit Postretirement Plans Accumulated Other Comprehensive Income (Loss) (Dollars in Thousands) Beginning balance: January 1, 2018 $ (504) $ 948 $ 137 $ (2,412) $ (1,831) Opening balance reclassification (111) 205 29 (520) (397) Cumulative effect accounting adjustment (831) — — — (831) Other comprehensive income (loss) (4,501) 4,995 (166) 1,558 1,886 Ending balance: December 31, 2018 $ (5,947) $ 6,148 $ — $ (1,374) $ (1,173) Other comprehensive income (loss) 10,345 10,331 — (1,334) 19,342 Ending balance: December 31, 2019 $ 4,398 $ 16,479 $ — $ (2,708) $ 18,169 Other comprehensive income (loss) 8,857 16,797 — (3,128) 22,526 Ending balance: December 31, 2020 $ 13,255 $ 33,276 $ — $ (5,836) $ 40,695

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease, Cost [Table Text Block]	The following table provides information related to the Company's lease cost for the periods indicated: Years Ended December 31 2020 2019 (Dollars in thousands) Operating lease cost (1) $ 16,881 $ 10,718 Short-term lease cost 16 116 Variable lease cost — — Total lease cost $ 16,897 $ 10,834
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The following table sets forth the undiscounted cash flows of base rent related to operating leases outstanding at December 31, 2020 with payments scheduled over the next five years and thereafter, including a reconciliation to the operating lease liability recognized in the Company's Consolidated Balance Sheet in other liabilities: (Dollars in thousands) 2021 $ 16,083 2022 10,725 2023 8,769 2024 7,237 2025 6,102 Thereafter 11,192 Total minimum lease payments 60,108 Less: amount representing interest 3,752 Present value of future minimum lease payments $ 56,356

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Off-Balance Sheet Financial Instruments	The following table summarizes the above financial instruments at the dates indicated: As of December 31 2020 2019 (Dollars in thousands) Commitments to extend credit $ 3,301,692 $ 3,337,930 Standby letters of credit $ 20,686 $ 21,565 Deferred standby letter of credit fees $ 164 $ 158 Loan exposures with recourse $ 303,265 $ 404,532

REGULATORY CAPITAL REQUIREMEN_2

REGULATORY CAPITAL REQUIREMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Regulated Operations [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2020 and 2019 are also presented in the table that follows: Actual For Capital To Be Well Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2020 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 1,374,349 15.13 % $ 726,482 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 1,150,177 12.67 % $ 408,646 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 1,211,177 13.34 % $ 544,861 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) leverage $ 1,211,177 9.56 % $ 506,805 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 1,320,056 14.54 % $ 726,313 ≥ 8.0 % $ 907,892 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 1,206,566 13.29 % $ 408,551 ≥ 4.5 % $ 590,130 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 1,206,566 13.29 % $ 544,735 ≥ 6.0 % $ 726,313 ≥ 8.0 % Tier 1 capital (to average assets) leverage $ 1,206,566 9.54 % $ 505,747 ≥ 4.0 % $ 632,184 ≥ 5.0 % December 31, 2019 (Dollars in thousands) Independent Bank Corp. Total capital (to risk weighted assets) $ 1,352,341 14.83 % $ 729,291 ≥ 8.0 % N/A N/A Common equity tier 1 capital (to risk weighted assets) $ 1,171,963 12.86 % $ 410,226 ≥ 4.5 % N/A N/A Tier 1 capital (to risk weighted assets) $ 1,232,963 13.53 % $ 546,969 ≥ 6.0 % N/A N/A Tier 1 capital (to average assets) $ 1,232,963 11.28 % $ 437,271 ≥ 4.0 % N/A N/A Rockland Trust Company Total capital (to risk weighted assets) $ 1,275,611 14.00 % $ 728,868 ≥ 8.0 % $ 911,085 ≥ 10.0 % Common equity tier 1 capital (to risk weighted assets) $ 1,205,740 13.23 % $ 409,988 ≥ 4.5 % $ 592,205 ≥ 6.5 % Tier 1 capital (to risk weighted assets) $ 1,205,740 13.23 % $ 546,651 ≥ 6.0 % $ 728,868 ≥ 8.0 % Tier 1 capital (to average assets) $ 1,205,740 11.06 % $ 435,886 ≥ 4.0 % $ 544,857 ≥ 5.0 %

PARENT COMPANY FINANCIALS ONLY

PARENT COMPANY FINANCIALS ONLY (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Balance Sheets	BALANCE SHEETS December 31 2020 2019 (Dollars in thousands) Assets Cash (1) $ 100,604 $ 135,688 Investments in subsidiaries (2) 1,761,383 1,743,435 Prepaid income taxes 1,927 31,586 Deferred tax asset 642 612 Derivative instruments (1) — 290 Total assets $ 1,864,556 $ 1,911,611 Liabilities and stockholders’ equity Dividends payable $ 15,164 $ 15,126 Long-term borrowings (less unamortized debt issuance costs of $40 and $94) 32,773 74,906 Junior subordinated debentures (less unamortized debt issuance costs of $37 and $40) 62,851 62,848 Subordinated debentures (less unamortized debt issuance costs of $304 and $399) 49,696 49,601 Derivative instruments (1) 569 — Other liabilities 818 987 Total liabilities 161,871 203,468 Stockholders’ equity 1,702,685 1,708,143 Total liabilities and stockholders’ equity $ 1,864,556 $ 1,911,611 (1) Entire balance eliminates in consolidation.
Schedule of Condensed Statements of Income	STATEMENTS OF INCOME Years Ended December 31 2020 2019 2018 (Dollars in thousands) Income Dividends received from subsidiaries (1) $ 166,033 $ 181,790 $ 71,255 Total income 166,033 181,790 71,255 Expenses Interest expense 5,432 8,236 4,234 Total expenses 5,432 8,236 4,234 Income before income taxes and equity in undistributed income of subsidiaries 160,601 173,554 67,021 Income tax benefit (1,499) (2,262) (1,151) Income of parent company 162,100 175,816 68,172 Equity (deficit) in undistributed income of subsidiaries (40,933) (10,641) 53,450 Net income $ 121,167 $ 165,175 $ 121,622
Schedule of Condensed Statements of Cash Flows	STATEMENTS OF CASH FLOWS Years Ended December 31 2020 2019 2018 (Dollars in thousands) Cash flows from operating activities Net income $ 121,167 $ 165,175 $ 121,622 Adjustments to reconcile net income to cash provided by operating activities Amortization 152 157 54 Deferred income tax expense 284 1,021 49 Change in prepaid income taxes and other assets (1) (475) 20,556 135 Change in other liabilities (169) (4,613) 6 Deficit (equity) in undistributed income of subsidiaries 40,933 10,641 (53,450) Net cash provided by operating activities 161,892 192,937 68,416 Cash flows used in investing activities Cash paid for acquisitions, net of cash acquired (2) — (148,297) (13,649) Net cash used in investing activities — (148,297) (13,649) Cash flows provided by (used in) financing activities Proceeds from line of credit, net of issuance costs — 49,980 — Repayment of line of credit, net of issuance costs — (49,980) — Proceeds from (repayments of) long-term debt, net of issuance costs (42,187) 74,867 — Repayments of junior subordinated debentures, net of issuance costs — (13,329) — Proceeds from issuance of subordinated debentures, net of issuance costs — 49,526 — Repayments of subordinated debentures, net of issuance costs — (34,767) — Restricted stock awards issued, net of awards surrendered (1,187) (1,463) (1,371) Net proceeds from exercise of stock options 197 281 184 Proceeds from shares issued under the direct stock purchase plan 2,132 4,951 2,712 Payments for shares repurchased under share repurchase program (95,091) — — Common dividends paid (60,840) (53,274) (40,167) Net cash provided by (used in) financing activities (196,976) 26,792 (38,642) Net increase (decrease) in cash and cash equivalents (35,084) 71,432 16,125 Cash and cash equivalents at the beginning of the year 135,688 64,256 48,131 Cash and cash equivalents at the end of the year $ 100,604 $ 135,688 $ 64,256 (1) Reflected in this line for the year ended December 31, 2020 is a noncash adjustment which decreased prepaid income taxes and increased investment in subsidiary by $30.1 million, which represents a reallocation of a tax asset from the parent to the bank subsidiary.

SELECTED QUARTERLY FINANCIAL _2

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	First Quarter Second Quarter Third Quarter Fourth Quarter 2020 2019 2020 2019 2020 2019 2020 2019 (Dollars in thousands, except per share data) Interest income $ 107,380 $ 91,543 $ 99,965 $ 122,144 $ 97,919 $ 119,624 $ 96,805 $ 113,703 Interest expense 13,076 9,018 8,867 16,125 7,036 15,026 5,362 13,710 Net interest income 94,304 82,525 91,098 106,019 90,883 104,598 91,443 99,993 Provision for credit losses 25,000 1,000 20,000 1,000 7,500 — — 4,000 Total noninterest income 26,435 21,533 28,190 28,648 29,347 31,816 27,468 33,297 Total noninterest expenses 66,840 56,311 66,607 93,032 66,658 67,533 73,727 67,445 Provision for income taxes 2,148 11,522 7,779 10,007 11,199 17,036 10,543 14,368 Net income $ 26,751 $ 35,225 $ 24,902 $ 30,628 $ 34,873 $ 51,845 $ 34,641 $ 47,477 Basic earnings per share $ 0.78 $ 1.25 $ 0.76 $ 0.89 $ 1.06 $ 1.51 $ 1.05 $ 1.38 Diluted earnings per share $ 0.78 $ 1.25 $ 0.76 $ 0.89 $ 1.06 $ 1.51 $ 1.05 $ 1.38 Weighted average common shares (basic) 34,184,431 28,106,184 32,944,761 34,313,492 32,951,918 34,361,176 32,964,090 34,374,953 Common stock equivalents 36,827 54,466 28,098 41,878 24,758 39,390 26,348 46,245 Weighted average common shares (diluted) 34,221,258 28,160,650 32,972,859 34,355,370 32,976,676 34,400,566 32,990,438 34,421,198 Unusual or infrequently occurring items Items within noninterest income Gain on sale of loans $ — $ — $ — $ — $ — $ 951 $ — $ — Total $ — $ — $ — $ — $ — $ 951 $ — $ — Items within noninterest expense Loss on termination of derivatives — — — — 684 — — — Merger and acquisition expense $ — $ 1,032 $ — $ 24,696 $ — $ 705 $ — $ — Adjustment for tax effect of previously incurred merger and acquisition expense — 650 — — — — — — Total $ — $ 1,682 $ — $ 24,696 $ 684 $ 705 $ — $ —

TRANSACTIONS WITH RELATED PAR_2

TRANSACTIONS WITH RELATED PARTIES Activity of Loans to Related Parties (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	The following information represents annual activity of loans to related parties for the periods indicated: 2020 2019 (Dollars in thousands) Principal balance of loans outstanding at beginning of year $ 55,830 $ 41,170 Loan advances (1) 45,308 49,771 Loan payments/payoffs (74,795) (35,111) Principal balance of loans outstanding at end of year $ 26,343 $ 55,830 (1) The 2019 amount includes $7.0 million of BHB acquired loans associated with director, which represent the outstanding loans balances at the effective date of appointment.

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2020
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	12 years
Lease Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Lease Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life	30 years

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020centerbranch	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Accounting Policies [Line Items]
Reserve for unfunded loan commitments | $		$ 2,100	$ 1,300
Maximum [Member]
Accounting Policies [Line Items]
Lease Option Period	15 years
Loans Receivable [Member] | Lender Concentration Risk [Member] | Residential Building [Member]
Accounting Policies [Line Items]
Loans of nonresidential buildings to total loan portfolio	17.10%	17.50%
Full Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches | branch	96
Limited Service Retail Branch [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of branches | branch	2
Commercial Banking Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	16
Investment Management Office [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	10
Mortgage Lending Center [Member] | Bank [Member]
Accounting Policies [Line Items]
Number of centers	8

ACQUISITIONS (Details)

ACQUISITIONS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Apr. 01, 2019	Dec. 31, 2017
Assets
Goodwill	$ 506,206	$ 506,206		$ 256,105
Blue Hills Bancorp, Inc. [Member]
Assets
Cash			$ 56,331
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments			196,937
Loans			2,073,714
Premises and equipment			24,253
Goodwill			250,101
Core deposit intangible			19,870
Other assets			146,192
Total assets acquired			2,767,398
Liabilities
Deposits			1,930,436
Borrowings			124,817
Other liabilities			50,857
Total liabilities assumed			2,106,110
Purchase price			$ 661,288

ACQUISITIONS (Details 2)

ACQUISITIONS (Details 2) - Blue Hills Bancorp, Inc. [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Net interest income after provision for loan losses	$ 408,918	$ 371,264
Net income	$ 129,385	$ 146,178

ACQUISITIONS PCI Loans Acquired

ACQUISITIONS PCI Loans Acquired (Details) - Blue Hills Bancorp, Inc. [Member] $ in Thousands	Apr. 01, 2019USD ($)
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition	$ 14,849
Contractual cash flows not expected to be collected	(5,717)
Expected cash flows at acquisition	9,132
Interest component of expected cash flows	(1,464)
Basis in PCI loans at acquisition - estimated fair value	$ 7,668

ACQUISITIONS (Details Textual)

ACQUISITIONS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Apr. 01, 2019	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Acquisition Related Costs		$ 0	$ 0	$ 0	$ 705	$ 24,696	$ 1,032	$ 0	$ 26,433	$ 11,168
Business Combination, Pro Forma Information [Abstract]
Business Combination, Acquired Receivable, Fair Value	$ 23,200
Blue Hills Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Equity Interest Issued or Issuable Shareholders Option To Receive, Cash Per Share	$ 5.25
Number of shares of company stock issued for each share of Central common stock (in shares)	0.2308
Business transaction value	$ 661,300
Cost of acquired entity, cash paid	$ 161,600
Increase in acquirer outstanding shares	6,166,010
Acquisition Related Costs								26,000
Loans acquired	$ 2,073,714
Combination of INDB and Blue Hills Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Acquisition Related Costs								$ 57,300

SECURITIES Securities (Equity g

SECURITIES Securities (Equity gains and losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Equity Securities, FV-NI, Gain (Loss) [Abstract]	$ 528	$ 1,566	$ (1,225)
Equity Securities, FV-NI, Realized Gain (Loss)	14	18	874
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 514	$ 1,548	$ (2,099)

SECURITIES (Reconciliation of f

SECURITIES (Reconciliation of fair value of Available for Sale securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Amortized Cost	$ 395,453	$ 420,703
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	17,869	6,118
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(462)	(397)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	412,860	426,424
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale, Amortized Cost	22,476	32,473
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,640	642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	24,116	33,115
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Amortized Cost	224,293	243,548
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9,337	3,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	(4)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	233,629	247,000
Agency collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale, Amortized Cost	88,687	87,305
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,083	1,225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(87)	(19)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	91,683	88,511
Single issuer trust preferred securities issued by banks [Member]
Debt Securities, Available-for-sale, Amortized Cost	489	488
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	488	493
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Debt Securities, Available-for-sale, Amortized Cost	1,429	1,488
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(373)	(374)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	1,056	1,114
Small Business Administration Pooled Securities [Member]
Debt Securities, Available-for-sale, Amortized Cost	57,289	54,024
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,792	771
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	61,081	54,795
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale, Amortized Cost	790	1,377
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	17	19
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale	$ 807	$ 1,396

SECURITIES (Available for Sale

SECURITIES (Available for Sale securities in continuous unrealized loss position) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)holding	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 24,248
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(89)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(1,056)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(373)
Debt Securities, Available-for-sale, Unrealized Loss Position	25,304
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(462)
Equity Securities, FV-NI, Realized Gain (Loss)	$ 14	$ 18	$ 874
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	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	437
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1)
Agency collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 23,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(87)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	23,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (87)
Single Issuer Trust Preferred Securities Issued By Banks [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
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	488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1)
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(1,056)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(373)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,056
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (373)

SECURITIES (Reconciliation of a

SECURITIES (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 724,512	$ 740,806
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	28,007	13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(342)	(971)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	752,177	753,263
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	724,512	740,806
Equity Securities, FV-NI, Realized Gain (Loss)	14	18	$ 874
Internal Investment Grade [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	724,512
US Government Agencies Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	0	12,874
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value		12,997
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,017	4,032
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	60	21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	4,077	4,053
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	356,085	397,414
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	18,036	8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(57)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	374,121	405,802
Agency collateralized mortgage obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	335,993	293,662
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	8,466	4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(340)	(849)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	344,119	297,314
Single issuer trust preferred securities issued by banks [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	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2)	(10)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	1,498	1,490
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	26,917	31,324
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,445	338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(55)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Fair Value	$ 28,362	$ 31,607

SECURITIES (Schedule of Contrac

SECURITIES (Schedule of Contractual maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 395,453	$ 420,703
Available for Sale, Fair Value
Debt Securities, Available-for-sale	412,860	426,424
Held to Maturity, Amortized Cost
Debt Securities, Held-to-maturity	724,512	740,806
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	724,512	740,806
Held to Maturity, Fair Value
Fair Value	752,177	753,263
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearAmortizedCost	2,599
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearFairValue	2,624
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsAmortizedCost	88,539
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsFair Value	91,314
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsAmortizedCost	118,670
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsFairValue	125,216
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsAmortizedCost	910,157
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsFairValue	945,883
AvailableForSaleandHeldToMaturityDebtSecuritiesAmortizedCost	1,119,965
Debt Securities, Available-for-sale and Held-to-maturity Fair Value	1,165,037
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	10,001
Due after five to ten years	12,475
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	22,476	32,473
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	10,231
Due after five to ten years	13,885
Due after ten years	0
Debt Securities, Available-for-sale	24,116	33,115
Held to Maturity, Amortized Cost
Debt Securities, Held-to-maturity	0	12,874
Held to Maturity, Fair Value
Fair Value		12,997
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	600
Due after one year to five years	84,049
Due after five to ten years	41,930
Due after ten years	268,874
Available for Sale, Fair Value
Due in one year or less	601
Due in one year or less	86,672
Due after five to ten years	45,549
Due after ten years	280,038
Available-for-sale Securities	412,860
Held to Maturity, Amortized Cost
Due in one year or less	1,999
Due after one year to five years	4,490
Due after five to ten years	76,740
Due after ten years	641,283
Held to Maturity, Fair Value
Due in one year or less	2,023
Due after one year to five years	4,642
Due after five to ten years	79,667
Due after ten years	665,845
Fair Value	752,177
US Treasury Securities [Member]
Held to Maturity, Amortized Cost
Due in one year or less	1,999
Due after one year to five years	2,018
Due after five to ten years	0
Due after ten years	0
Debt Securities, Held-to-maturity	4,017	4,032
Held to Maturity, Fair Value
Due in one year or less	2,023
Due after one year to five years	2,054
Due after five to ten years	0
Due after ten years	0
Fair Value	4,077	4,053
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	74,048
Due after five to ten years	29,265
Due after ten years	120,980
Debt Securities, Available-for-sale, Amortized Cost	224,293	243,548
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	76,441
Due after five to ten years	31,458
Due after ten years	125,730
Debt Securities, Available-for-sale	233,629	247,000
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	2,472
Due after five to ten years	75,240
Due after ten years	278,373
Debt Securities, Held-to-maturity	356,085	397,414
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	2,588
Due after five to ten years	78,169
Due after ten years	293,364
Fair Value	374,121	405,802
Agency collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	88,687
Debt Securities, Available-for-sale, Amortized Cost	88,687	87,305
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	91,683
Debt Securities, Available-for-sale	91,683	88,511
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	335,993
Debt Securities, Held-to-maturity	335,993	293,662
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	344,119
Fair Value	344,119	297,314
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	600
Due after one year to five years	0
Due after five to ten years	190
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	790	1,377
Available for Sale, Fair Value
Due in one year or less	601
Due in one year or less	0
Due after five to ten years	206
Due after ten years	0
Debt Securities, Available-for-sale	807	1,396
Single issuer trust preferred securities issued by banks [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	489
Debt Securities, Available-for-sale, Amortized Cost	489	488
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	488
Debt Securities, Available-for-sale	488	493
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,500
Due after ten years	0
Debt Securities, Held-to-maturity	1,500	1,500
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,498
Due after ten years	0
Fair Value	1,498	1,490
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	1,429
Debt Securities, Available-for-sale, Amortized Cost	1,429	1,488
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	1,056
Debt Securities, Available-for-sale	1,056	1,114
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	57,289
Debt Securities, Available-for-sale, Amortized Cost	57,289	54,024
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	61,081
Debt Securities, Available-for-sale	61,081	54,795
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	26,917
Debt Securities, Held-to-maturity	26,917	31,324
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	28,362
Fair Value	$ 28,362	$ 31,607

SECURITIES (Unrealized loss NOT

SECURITIES (Unrealized loss NOT deemed OTTI) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)holding	Dec. 31, 2019USD ($)holding	Dec. 31, 2018USD ($)
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 25,304
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 373
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 24,248
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(89)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(1,056)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(462)
Equity Securities, FV-NI, Realized Gain (Loss)	14	$ 18	$ 874
Agency mortgage-backed securities [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		12
Fair value, less than 12 months		$ 34,009
Fair value, 12 months or longer		243
Fair value, Total		34,252
Unrealized losses, Total		(61)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(59)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (2)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	74,048
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	29,265
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	31,458
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	120,980
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	$ 125,730
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1)
Single issuer trust preferred securities issued by banks [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	0
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	489
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	488
Agency collateralized mortgage obligations [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	23,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		17
Fair value, less than 12 months		$ 48,476
Fair value, 12 months or longer		37,382
Fair value, Total		85,858
Unrealized losses, Total		(868)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(215)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (653)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	0
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	88,687
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	$ 91,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 23,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(87)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(87)
US States and Political Subdivisions Debt Securities [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	600
Summary of gross unrealized losses and fair value of investments
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	601
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	190
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	206
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	0
Small Business Administration Pooled Securities [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		1
Fair value, less than 12 months		$ 7,349
Fair value, 12 months or longer		0
Fair value, Total		7,349
Unrealized losses, Total		(55)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(55)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	0
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	57,289
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	61,081
Equity Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		32
Fair value, less than 12 months		$ 89,834
Fair value, 12 months or longer		40,229
Fair value, Total		130,063
Unrealized losses, Total		(1,368)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(329)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (1,039)
Single Issuer Trust Preferred Securities Issued By Banks [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		1
Fair value, less than 12 months		$ 0
Fair value, 12 months or longer		1,490
Fair value, Total		1,490
Unrealized losses, Total		(10)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (10)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1)
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	1,056
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	373
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		1
Fair value, less than 12 months		$ 0
Fair value, 12 months or longer		1,114
Fair value, Total		1,114
Unrealized losses, Total		(374)
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		$ (374)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	0
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	1,429
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	$ 1,056
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(1,056)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (373)

SECURITIES (Details Textual)

SECURITIES (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Trading	$ 2,838	$ 2,179
Equity Securities, FV-NI	22,107	21,261
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Available-for-sale	412,860	426,424
Interest Receivable	36,000
Callable securities in investment portfolio	3,600
Investment securities pledged	419,600	375,500
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)		0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held		0
Debt Securities, Available-for-sale, Past due	0
Debt Securities, Available-for-sale, Nonaccrual	0
Debt Securities, Held-to-maturity, Past Due	0
Debt Securities, Held-to-maturity, Nonaccrual	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	0
Debt Securities, Available-for-Sale, Accrued Interest Writeoff	0
Debt Securities, Available-for-sale, Realized Gain (Loss)	0	(1,500)
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease)	0
Debt Securities, Held-to-Maturity, Accrued Interest, Writeoff	0
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)	0	0
Held-to-maturity Securities [Member]
Interest Receivable	1,500	1,900
Available-for-sale Securities [Member]
Interest Receivable	$ 1,200	$ 1,300

Finance Receivable, Allowance f

Finance Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 113,392	[1]	$ 67,740
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	(1,137)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	1,157
Financing Receivable, Allowance for Credit Loss, Writeoff		(8,446)
Financing Receivable, Allowance for Credit Loss, Recovery		1,578
Financing Receivable, Credit Loss, Expense (Reversal)		52,500
Financing Receivable, Nonaccrual, No Allowance	[4]	35,528
Finance Receivable, Nonaccrual, with allowance	[4]	31,332
Financing Receivable, Nonaccrual	[4]	66,860		45,892
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		21,086	[1]	17,594
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	(1,984)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	49
Financing Receivable, Allowance for Credit Loss, Writeoff		(2,309)
Financing Receivable, Allowance for Credit Loss, Recovery		289
Financing Receivable, Credit Loss, Expense (Reversal)		7,447
Financing Receivable, Nonaccrual, No Allowance		30,925
Finance Receivable, Nonaccrual, with allowance		3,804
Financing Receivable, Nonaccrual		34,729		22,574
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		45,009	[1]	32,935
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	(13,048)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	337
Financing Receivable, Allowance for Credit Loss, Writeoff		(3,885)
Financing Receivable, Allowance for Credit Loss, Recovery		9
Financing Receivable, Credit Loss, Expense (Reversal)		28,661
Financing Receivable, Nonaccrual, No Allowance		0
Finance Receivable, Nonaccrual, with allowance		10,195
Financing Receivable, Nonaccrual		10,195		3,016
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		5,397	[1]	6,053
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	(3,652)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	0
Financing Receivable, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Allowance for Credit Loss, Recovery		0
Financing Receivable, Credit Loss, Expense (Reversal)		2,996
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		5,095	[1]	1,746
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	495
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	0
Financing Receivable, Allowance for Credit Loss, Writeoff		(380)
Financing Receivable, Allowance for Credit Loss, Recovery		33
Financing Receivable, Credit Loss, Expense (Reversal)		3,201
Financing Receivable, Nonaccrual, No Allowance		10
Finance Receivable, Nonaccrual, with allowance		815
Financing Receivable, Nonaccrual		825		311
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		14,275	[1]	3,440
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	9,828
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	423
Financing Receivable, Allowance for Credit Loss, Writeoff		(105)
Financing Receivable, Allowance for Credit Loss, Recovery		2
Financing Receivable, Credit Loss, Expense (Reversal)		687
Financing Receivable, Nonaccrual, No Allowance		4,593
Finance Receivable, Nonaccrual, with allowance		10,935
Financing Receivable, Nonaccrual		15,528		13,360
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		22,060	[1]	5,576
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	7,012
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	319
Financing Receivable, Allowance for Credit Loss, Writeoff		(142)
Financing Receivable, Allowance for Credit Loss, Recovery		210
Financing Receivable, Credit Loss, Expense (Reversal)		9,085
Financing Receivable, Nonaccrual, No Allowance		0
Finance Receivable, Nonaccrual, with allowance		5,427
Financing Receivable, Nonaccrual		5,427		6,570
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		470	[1]	396
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[2]	212
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[3]	29
Financing Receivable, Allowance for Credit Loss, Writeoff		(1,625)
Financing Receivable, Allowance for Credit Loss, Recovery		1,035
Financing Receivable, Credit Loss, Expense (Reversal)		423
Financing Receivable, Nonaccrual, No Allowance		0
Finance Receivable, Nonaccrual, with allowance		156
Financing Receivable, Nonaccrual		$ 156		$ 61
[1]	Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $36.0 million at December 31, 2020
[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.
[4]	Included in these amounts are $22.2 million and $24.8 million of nonaccruing TDRs at December 31, 2020 and December 31, 2019, respectively.

Financing Receivable Credit Qua

Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		$ 2,812,901
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,341,947
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		896,983
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		857,830
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		698,323
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		1,314,136
Financing Receivable, Revolving		1,447,865
Total loans		9,392,866	$ 8,873,639	$ 6,906,194
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,103,152	1,395,036
Financing Receivable, Year One, Originated, Current Fiscal Year		1,086,474
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		145,038
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		118,153
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		38,425
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		21,441
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		20,615
Financing Receivable, Revolving		670,468
Total loans		2,103,152	1,395,036	1,093,629
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss		4,173,927	4,002,359
Financing Receivable, Year One, Originated, Current Fiscal Year		1,108,100
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		784,944
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		514,868
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		574,542
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		401,380
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		742,661
Financing Receivable, Revolving		32,695
Total loans		4,173,927	4,002,359	3,251,248
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss		553,929	547,293
Financing Receivable, Year One, Originated, Current Fiscal Year		273,207
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		177,901
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		31,226
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		32,538
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		6,689
Financing Receivable, Revolving		31,780
Total loans		553,929	547,293	365,165
Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss		175,023	174,497
Financing Receivable, Year One, Originated, Current Fiscal Year		42,397
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		28,199
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		19,634
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		13,437
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		13,980
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		20,194
Financing Receivable, Revolving		37,182
Total loans		175,023	174,497	164,676
Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,296,183	1,590,569
Financing Receivable, Year One, Originated, Current Fiscal Year		219,595
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		146,058
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		160,849
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		144,638
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		219,726
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		405,317
Financing Receivable, Revolving		0
Total loans		1,296,183	$ 1,590,569	$ 923,294
Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		82,312
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		59,409
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		52,088
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		53,570
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		41,181
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		111,800
Financing Receivable, Revolving		663,412
Total loans		1,068,790
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		816
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		398
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		165
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		680
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		615
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		6,860
Financing Receivable, Revolving		12,328
Total loans		21,862
Revolving converted to term [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		22,881
Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		2,538
Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		14,737
Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		588
Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		5,018
Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	[1]	1,074,773
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		141,859
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		97,908
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		30,431
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		19,426
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		19,749
Financing Receivable, Revolving		631,049
Total loans		2,017,733
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		1,054,345
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		726,276
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		480,725
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		544,826
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		372,542
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		664,256
Financing Receivable, Revolving		19,085
Total loans		3,876,792
Pass [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		255,679
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		167,948
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		30,706
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		32,538
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		6,689
Financing Receivable, Revolving		31,705
Total loans		525,853
Pass [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		41,713
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		27,751
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		19,497
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		13,411
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		13,837
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		19,624
Financing Receivable, Revolving		35,451
Total loans		171,284
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		219,595
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		146,058
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		160,422
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		144,638
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		215,568
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		401,279
Financing Receivable, Revolving		0
Total loans		1,287,560
Pass [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		82,312
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		59,409
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		52,088
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		53,570
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		41,181
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		111,360
Financing Receivable, Revolving		661,575
Total loans		1,066,158
Pass [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		816
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		398
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		165
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		665
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		615
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		6,749
Financing Receivable, Revolving		12,317
Total loans		21,725
Pass [Member] | Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		2,538
Pass [Member] | Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		14,737
Pass [Member] | Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		588
Pass [Member] | Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Pass [Member] | Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Pass [Member] | Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		4,663
Pass [Member] | Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Potential Weakness [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		9,020
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,869
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		670
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		4,997
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		1,539
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		294
Financing Receivable, Revolving		20,766
Total loans		39,155
Potential Weakness [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		27,877
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		55,166
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		30,286
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		19,531
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		25,462
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		71,252
Financing Receivable, Revolving		13,610
Total loans		243,184
Potential Weakness [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		17,528
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		9,953
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		520
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		75
Total loans		28,076
Potential Weakness [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		10
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		15
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		15
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		6
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		217
Financing Receivable, Revolving		822
Total loans		1,085
Potential Weakness [Member] | Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Potential Weakness [Member] | Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Potential Weakness [Member] | Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Weakness Loss Unlikely [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		2,009
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,310
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		19,575
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		2,997
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		320
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		429
Financing Receivable, Revolving		6,991
Total loans		33,631
Definite Weakness Loss Unlikely [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		25,878
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		3,502
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		3,857
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		10,185
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		3,376
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		7,153
Financing Receivable, Revolving		0
Total loans		53,951
Definite Weakness Loss Unlikely [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Definite Weakness Loss Unlikely [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		684
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		438
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		122
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		11
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		137
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		353
Financing Receivable, Revolving		883
Total loans		2,628
Definite Weakness Loss Unlikely [Member] | Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Weakness Loss Unlikely [Member] | Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Weakness Loss Unlikely [Member] | Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Weakness Loss Unlikely [Member] | Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Partial Loss Probable [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		672
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		156
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		143
Financing Receivable, Revolving		11,662
Total loans		12,633
Partial Loss Probable [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Total loans		0
Partial Loss Probable [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Total loans		0
Partial Loss Probable [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		26
Total loans		26
Partial Loss Probable [Member] | Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Partial Loss Probable [Member] | Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Partial Loss Probable [Member] | Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Partial Loss Probable [Member] | Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Loss [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Definite Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Total loans		0
Definite Loss [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Total loans		0
Definite Loss [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, Revolving		0
Total loans		0
Definite Loss [Member] | Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Loss [Member] | Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Loss [Member] | Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Definite Loss [Member] | Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Default [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		427
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		4,158
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		4,038
Financing Receivable, Revolving		0
Total loans		8,623
Default [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		440
Financing Receivable, Revolving		1,837
Total loans		2,632
Default [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		15
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		111
Financing Receivable, Revolving		11
Total loans		137
Default [Member] | Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		0
Default [Member] | Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		355
Default [Member] | Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving		$ 0
[1]	Loans originated as part of the Paycheck Protection Program ("PPP") established by the CARES Act are reported as commercial and industrial under the 2020 vintage year and as"Pass" because these loans are 100% guaranteed by the U.S. Government. Funded PPP loans outstanding totaled $791.9 million at December 31, 2020.

Credit Losses textual (Details)

Credit Losses textual (Details) - USD ($)		3 Months Ended								6 Months Ended	12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Credit Loss [Line Items]
Interest Receivable		$ 36,000,000									$ 36,000,000
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	[1]										(1,137,000)
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	[2]										1,157,000
Loans and Leases Receivable, Allowance		(113,392,000)				$ (67,740,000)					(113,392,000)	$ (67,740,000)	$ (64,293,000)	$ (60,643,000)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)											$ (45,600,000)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) by percentage											67.30%
Provision for credit losses		0	$ 7,500,000	$ 20,000,000	$ 25,000,000	4,000,000	$ 0	$ 1,000,000	$ 1,000,000	$ 4,775,000	$ 52,500,000	6,000,000	$ 4,775,000
Off-Balance Sheet, Credit Loss, Liability		1,200,000									$ 1,200,000
Days To Be Termed As Non Accrual Loans											90 days
Loans with active Deferrals		173,600,000									$ 173,600,000
Tdrs Recorded Investment On Nonaccrual Status		22,209,000				$ 24,766,000					22,209,000	$ 24,766,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default											0
US Government Insured Loan Program [Member]
Credit Loss [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 791,900,000									$ 791,900,000
[1]	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.
[2]	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.

Finance Receivable Credit Quali

Finance Receivable Credit Quality Indicators for Consumer and Residential Portfolio's (Details) - score		Dec. 31, 2020	Dec. 31, 2019
Residential Portfolio Segment [Member]
Finance Receivable Credit Quality Indicators For Consumer And Residential Portfolio [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]	57.40%	59.00%
Home Equity Line of Credit [Member]
Finance Receivable Credit Quality Indicators For Consumer And Residential Portfolio [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	771	767
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	46.00%	46.60%
[1]	The average FICO scores at December 31, 2020 are based upon rescores from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020.  The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019.
[2]	The combined LTV ratios for December 31, 2020 are based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.

Finance Receivable, Nonaccrual

Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Tdrs Recorded Investment On Nonaccrual Status		$ 22,209	$ 24,766
Finance Receivable, Nonaccrual, with allowance	[1]	31,332
Financing Receivable, Nonaccrual, No Allowance	[1]	35,528
Financing Receivable, Nonaccrual	[1]	$ 66,860	$ 45,892
[1]	Included in these amounts are $22.2 million and $24.8 million of nonaccruing TDRs at December 31, 2020 and December 31, 2019, respectively.

Foreclosed Residential Real Est

Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Credit Loss [Abstract]
Foreclosed residential real estate property held by the creditor	$ 0	$ 0
Mortgage Loans in Process of Foreclosure, Amount	$ 1,750	$ 3,294

Financing Receivable Troubled D

Financing Receivable Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Tdrs Recorded Investment On Accrual Status	$ 16,983	$ 19,599
Tdrs Recorded Investment On Nonaccrual Status	22,209	24,766
Financing Receivable Recorded Investment Trouble Debt Restructuring	39,192	44,365
Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring		855
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring	$ 263	$ 63

Loans, Allowance for Credit Los

Loans, Allowance for Credit Losses and Credit Quality Schedule of Debtor Troubled Debt Restructurings, Subsequent Period (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)contract	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Troubled Debt Restructurings On Financing Receivables Post Modifications		The following table shows the troubled debt restructurings which occurred for the periods indicated and the change in the recorded investment subsequent to the modifications occurring: Year Ended December 31, 2020 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 8 $ 732 $ 732 Commercial real estate 10 2,865 2,865 Small business 10 752 728 Residential real estate 2 559 642 Total 30 $ 4,908 $ 4,967 Year Ended December 31, 2019 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial 3 $ 268 $ 268 Commercial real estate 4 819 819 Small business 1 14 14 Residential real estate 3 967 1,009 Home equity 2 121 121 Total 13 $ 2,189 $ 2,231 Year Ended December 31, 2018 Number of Pre-Modification Post-Modification Troubled debt restructurings Commercial and industrial $ 12 $ 35,688 $ 39,224 Commercial real estate 3 1,600 1,600 Residential real estate 5 1,048 1,071 Home equity 9 562 562 Total $ 29 $ 38,898 $ 42,457
Financing Receivable, Modifications, Number of Contracts | contract	29	30	13
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 38,898	$ 4,908	$ 2,189
Post-Modification Outstanding Recorded Investment	$ 42,457	$ 4,967	$ 2,231
Commercial And Industrial [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	12	8	3
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 35,688	$ 732	$ 268
Post-Modification Outstanding Recorded Investment	$ 39,224	$ 732	$ 268
Commercial Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	3	10	4
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,600	$ 2,865	$ 819
Post-Modification Outstanding Recorded Investment	$ 1,600	$ 2,865	$ 819
Small Business [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		10	1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 752	$ 14
Post-Modification Outstanding Recorded Investment		$ 728	$ 14
Residential Real Estate [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	2	3
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,048	$ 559	$ 967
Post-Modification Outstanding Recorded Investment	$ 1,071	$ 642	$ 1,009
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9		2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 562		$ 121
Post-Modification Outstanding Recorded Investment	$ 562		$ 121

TDR Modification by Type (Detai

TDR Modification by Type (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
TDR On Financing Receivables Post Modification By Type [Line Items]
Post-Modification Outstanding Recorded Investment	$ 42,457	$ 4,967	$ 2,231
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification		4,967	2,231	$ 42,457
Contractual Interest Rate Reduction [Member]
TDR On Financing Receivables Post Modification By Type [Line Items]
Post-Modification Outstanding Recorded Investment		822	150	57
Court Ordered Concession [Member]
TDR On Financing Receivables Post Modification By Type [Line Items]
Post-Modification Outstanding Recorded Investment		25	75	710
Extended Maturity [Member]
TDR On Financing Receivables Post Modification By Type [Line Items]
Post-Modification Outstanding Recorded Investment		4,120	1,565	2,878
Combination Rate and Maturity member
TDR On Financing Receivables Post Modification By Type [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0	$ 441	$ 38,812

Loans, Allowance for Credit L_2

Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan		Dec. 31, 2018USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	301	447
Principal Balance Total Past Due | $	$ 21,396	$ 25,485
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	25	43
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	82	113
Number Of Financing Receivables Total Past Due | loan	408	603
Financing Receivable, Not Past Due | $	$ 9,371,470	$ 8,848,154
Total loans | $	9,392,866	8,873,639		$ 6,906,194
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 1	$ 2,157
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	2	1
Principal Balance Total Past Due | $	$ 1,775	$ 1,336
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	1	2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	8	5
Number Of Financing Receivables Total Past Due | loan	11	8
Financing Receivable, Not Past Due | $	$ 2,101,377	$ 1,393,700
Total loans | $	2,103,152	1,395,036		1,093,629
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	3	7
Principal Balance Total Past Due | $	$ 924	$ 3,922
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	4	8
Number Of Financing Receivables Total Past Due | loan	7	16
Financing Receivable, Not Past Due | $	$ 4,173,003	$ 3,998,437
Total loans | $	4,173,927	4,002,359		3,251,248
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 218	[1]
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	0	1
Principal Balance Total Past Due | $	$ 2,794	$ 560
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	2	0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	0	0
Number Of Financing Receivables Total Past Due | loan	2	1
Financing Receivable, Not Past Due | $	$ 551,135	$ 546,733
Total loans | $	553,929	547,293		365,165
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 0
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	14	11
Principal Balance Total Past Due | $	$ 753	$ 967
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	6	3
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	4	6
Number Of Financing Receivables Total Past Due | loan	24	20
Financing Receivable, Not Past Due | $	$ 174,270	$ 173,530
Total loans | $	175,023	174,497		164,676
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 0
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	12	17
Principal Balance Total Past Due | $	$ 11,305	$ 12,312
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	8	17
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	27	38
Number Of Financing Receivables Total Past Due | loan	47	72
Financing Receivable, Not Past Due | $	$ 1,284,878	$ 1,578,257
Total loans | $	1,296,183	1,590,569		923,294
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 1,652	[1]
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	10	23
Principal Balance Total Past Due | $	$ 3,569	$ 6,067
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	5	8
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	33	40
Number Of Financing Receivables Total Past Due | loan	48	71
Financing Receivable, Not Past Due | $	$ 1,065,221	$ 1,127,731
Total loans | $	1,068,790	1,133,798		1,092,084
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 0	$ 265	[1]
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	260	387	[2]
Principal Balance Total Past Due | $	$ 276	$ 321	[2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	3	12	[2]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	6	16	[2]
Number Of Financing Receivables Total Past Due | loan	269	415	[2]
Financing Receivable, Not Past Due | $	$ 21,586	$ 29,766	[2]
Total loans | $	21,862	30,087	[2]	$ 16,098
Financing Receivable, 90 Days or More Past Due, Still Accruing | $	$ 1	$ 22	[2]
[1]	Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
[2]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Allowance Allocations (Details)

Allowance Allocations (Details) - USD ($) $ in Thousands	3 Months Ended									6 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	$ 0	$ 7,500	$ 20,000	$ 25,000	$ 4,000		$ 0	$ 1,000	$ 1,000	$ 4,775	$ 52,500	$ 6,000		$ 4,775
Loans and Leases Receivable, Allowance	113,392				67,740						113,392	67,740		64,293	$ 60,643
Allowance for Loan and Lease Losses, Write-offs										(2,597)		(5,205)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										1,472		2,652
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					66,760							66,760		63,214
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					980							980		1,079
Financing Receivable, Collectively Evaluated for Impairment					8,809,155							8,809,155		6,838,339
Financing Receivable, Individually Evaluated for Impairment					49,628							49,628		59,060
Financing Receivable, after Allowance for Credit Loss					6,119,185							6,119,185
Total loans	9,392,866				8,873,639						9,392,866	8,873,639		6,906,194
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										2,677		947
Loans and Leases Receivable, Allowance					17,594							17,594		15,760	13,256
Allowance for Loan and Lease Losses, Write-offs										(355)		(244)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										182		1,131
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					17,468							17,468		15,753
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					126							126		7
Financing Receivable, Collectively Evaluated for Impairment					1,370,580							1,370,580		1,064,800
Financing Receivable, Individually Evaluated for Impairment					24,456							24,456		28,829
Financing Receivable, after Allowance for Credit Loss					1,395,036							1,395,036
Financing Receivable, before Allowance for Credit Loss	2,103,152				1,395,036						2,103,152	1,395,036
Total loans	2,103,152				1,395,036						2,103,152	1,395,036		1,093,629
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										811		3,027
Loans and Leases Receivable, Allowance					32,935							32,935		32,370	31,453
Allowance for Loan and Lease Losses, Write-offs										(82)		(2,614)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										188		152
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					32,887							32,887		32,333
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					48							48		37
Financing Receivable, Collectively Evaluated for Impairment					3,987,848							3,987,848		3,235,418
Financing Receivable, Individually Evaluated for Impairment					8,337							8,337		10,839
Financing Receivable, after Allowance for Credit Loss					4,002,359							4,002,359
Financing Receivable, before Allowance for Credit Loss	4,173,927				4,002,359						4,173,927	4,002,359
Total loans	4,173,927				4,002,359						4,173,927	4,002,359		3,251,248
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										(540)		895
Loans and Leases Receivable, Allowance					6,053							6,053		5,158	5,698
Allowance for Loan and Lease Losses, Write-offs										0		0
Allowance for Loan and Lease Loss, Recovery of Bad Debts										0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					6,053							6,053		5,158
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					0							0
Financing Receivable, Collectively Evaluated for Impairment					547,293							547,293		365,165
Financing Receivable, Individually Evaluated for Impairment					0							0		0
Financing Receivable, after Allowance for Credit Loss					547,293							547,293
Financing Receivable, before Allowance for Credit Loss	553,929				547,293						553,929	547,293
Total loans	553,929				547,293						553,929	547,293		365,165
Small Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										505		377
Loans and Leases Receivable, Allowance					1,746							1,746		1,756	1,577
Allowance for Loan and Lease Losses, Write-offs										(372)		(509)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										46		122
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					1,738							1,738		1,755
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					8							8		1
Financing Receivable, Collectively Evaluated for Impairment					173,960							173,960		164,135
Financing Receivable, Individually Evaluated for Impairment					537							537		541
Financing Receivable, after Allowance for Credit Loss					174,497							174,497
Financing Receivable, before Allowance for Credit Loss	175,023				174,497						175,023	174,497
Total loans	175,023				174,497						175,023	174,497		164,676
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										533		79
Loans and Leases Receivable, Allowance					3,440							3,440		3,219	2,822
Allowance for Loan and Lease Losses, Write-offs										(148)		0
Allowance for Loan and Lease Loss, Recovery of Bad Debts										12		142
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					2,803							2,803		2,357
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					637							637		862
Financing Receivable, Collectively Evaluated for Impairment					1,571,848							1,571,848		906,959
Financing Receivable, Individually Evaluated for Impairment					11,228							11,228		12,706
Financing Receivable, before Allowance for Credit Loss	1,296,183				1,590,569						1,296,183	1,590,569
Total loans	1,296,183				1,590,569						1,296,183	1,590,569		923,294
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										355		(110)
Loans and Leases Receivable, Allowance					5,576							5,576		5,608	5,390
Allowance for Loan and Lease Losses, Write-offs										(293)		(240)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										156		318
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					5,420							5,420		5,444
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					156							156		164
Financing Receivable, Collectively Evaluated for Impairment					1,127,963							1,127,963		1,085,961
Financing Receivable, Individually Evaluated for Impairment					4,948							4,948		5,948
Total loans	1,068,790				1,133,798						1,068,790	1,133,798		1,092,084
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses										434		785
Loans and Leases Receivable, Allowance					396							396		422	$ 447
Allowance for Loan and Lease Losses, Write-offs										(1,347)		(1,598)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										$ 888		787
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment					391							391		414
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment					5							5		8
Financing Receivable, Collectively Evaluated for Impairment					29,663							29,663		15,901
Financing Receivable, Individually Evaluated for Impairment					122							122		197
Financing Receivable, before Allowance for Credit Loss	21,862				30,087						21,862	30,087
Total loans	$ 21,862				30,087	[1]					$ 21,862	30,087	[1]	16,098
Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					14,856							14,856		8,795
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					0							0		0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					6,174							6,174		4,991
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					0							0		0
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					0							0		0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					7,493							7,493		3,629
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					887							887		175
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss					$ 302							$ 302		$ 0
[1]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Internal Risk Rating Categories

Internal Risk Rating Categories for Commercial Portfolio (Details) $ in Thousands	Dec. 31, 2019USD ($)
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	$ 6,119,185
Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	1,395,036
Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	4,002,359
Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	547,293
Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	174,497
Pass [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	5,848,531
Pass [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	1,274,155
Pass [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	3,860,555
Pass [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	542,608
Pass [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	171,213
Potential weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	164,416
Potential weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	63,485
Potential weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	97,268
Potential weakness [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	2,247
Potential weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	1,416
Definite weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	106,238
Definite weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	57,396
Definite weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	44,536
Definite weakness [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	2,438
Definite weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	1,868
Parital loss probable [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Parital loss probable [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Parital loss probable [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Parital loss probable [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Parital loss probable [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Definite loss [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Definite loss [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Definite loss [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Definite loss [Member] | Construction Loans [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	0
Definite loss [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Financing Receivable, after Allowance for Credit Loss	$ 0

Weighted Average FICO Scores &

Weighted Average FICO Scores & weighted Average Combined LTV Ratios (Details) - score		Dec. 31, 2020	Dec. 31, 2019
Residential Portfolio Segment [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	[1]	749	749
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	57.40%	59.00%
Home Equity [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	[1]	771	767
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	46.00%	46.60%
[1]	The average FICO scores at December 31, 2020 are based upon rescores from December 2020, as available for previously originated loans, or origination score data for loans booked in December 2020.  The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019.
[2]	The combined LTV ratios for December 31, 2020 are based upon updated automated valuations as of November 2020, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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.

Summary of Nonaccrual Loans (De

Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Tdrs Recorded Investment On Nonaccrual Status		$ 22,209	$ 24,766
Financing Receivable, Nonaccrual	[1]	66,860	45,892
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		34,729	22,574
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		10,195	3,016
Small Business [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		825	311
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		15,528	13,360
Home Equity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		5,427	6,570
Consumer Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Nonaccrual		$ 156	$ 61
[1]	Included in these amounts are $22.2 million and $24.8 million of nonaccruing TDRs at December 31, 2020 and December 31, 2019, respectively.

LOANS, ALLOWANCE FOR LOAN LOS_3

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Foreclosed Residential Real Estate Property (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Foreclosed Residential Real Estate Property [Line Items]
Foreclosed residential real estate property held by the creditor	$ 0	$ 0
Mortgage Loans in Process of Foreclosure, Amount	$ 1,750	$ 3,294

Age Analysis of Past Due Financ

Age Analysis of Past Due Financing receivables (Details) $ in Thousands	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan		Dec. 31, 2018USD ($)
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	301	447
Number of Loans 60-89 Days | loan	25	43
Number of Loans 90 Days or More | loan	82	113
Number of Loans Total Past Due | loan	408	603
Principal Balance Total Past Due	$ 21,396	$ 25,485
Current	9,371,470	8,848,154
Total loans	9,392,866	8,873,639		$ 6,906,194
Recorded Investment >90 Days and Accruing	$ 1	$ 2,157
Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	2	1
Number of Loans 60-89 Days | loan	1	2
Number of Loans 90 Days or More | loan	8	5
Number of Loans Total Past Due | loan	11	8
Principal Balance Total Past Due	$ 1,775	$ 1,336
Current	2,101,377	1,393,700
Total loans	2,103,152	1,395,036		1,093,629
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	3	7
Number of Loans 60-89 Days | loan	0	1
Number of Loans 90 Days or More | loan	4	8
Number of Loans Total Past Due | loan	7	16
Principal Balance Total Past Due	$ 924	$ 3,922
Current	4,173,003	3,998,437
Total loans	4,173,927	4,002,359		3,251,248
Recorded Investment >90 Days and Accruing	$ 0	$ 218	[1]
Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	0	1
Number of Loans 60-89 Days | loan	2	0
Number of Loans 90 Days or More | loan	0	0
Number of Loans Total Past Due | loan	2	1
Principal Balance Total Past Due	$ 2,794	$ 560
Current	551,135	546,733
Total loans	553,929	547,293		365,165
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Small Business [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	14	11
Number of Loans 60-89 Days | loan	6	3
Number of Loans 90 Days or More | loan	4	6
Number of Loans Total Past Due | loan	24	20
Principal Balance Total Past Due	$ 753	$ 967
Current	174,270	173,530
Total loans	175,023	174,497		164,676
Recorded Investment >90 Days and Accruing	$ 0	$ 0
Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	12	17
Number of Loans 60-89 Days | loan	8	17
Number of Loans 90 Days or More | loan	27	38
Number of Loans Total Past Due | loan	47	72
Principal Balance Total Past Due	$ 11,305	$ 12,312
Current	1,284,878	1,578,257
Total loans	1,296,183	1,590,569		923,294
Recorded Investment >90 Days and Accruing	$ 0	$ 1,652	[1]
Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	10	23
Number of Loans 60-89 Days | loan	5	8
Number of Loans 90 Days or More | loan	33	40
Number of Loans Total Past Due | loan	48	71
Principal Balance Total Past Due	$ 3,569	$ 6,067
Current	1,065,221	1,127,731
Total loans	1,068,790	1,133,798		1,092,084
Recorded Investment >90 Days and Accruing	$ 0	$ 265	[1]
Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days | loan	260	387	[2]
Number of Loans 60-89 Days | loan	3	12	[2]
Number of Loans 90 Days or More | loan	6	16	[2]
Number of Loans Total Past Due | loan	269	415	[2]
Principal Balance Total Past Due	$ 276	$ 321	[2]
Current	21,586	29,766	[2]
Total loans	21,862	30,087	[2]	$ 16,098
Recorded Investment >90 Days and Accruing	1	22	[2]
Financial Asset, 30 to 59 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	4,168	7,511
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	318	253
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	409	1,690
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	560
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	421	837
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,150	2,237
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	733	1,689
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	137	245	[2]
Financial Asset, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	9,450	4,155
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	672	323
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	194
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,794	0
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	273	15
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	5,507	3,055
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	203	524
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	1	44	[2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	7,778	13,819
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	785	760
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	515	2,038
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	59	115
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	3,648	7,020
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	2,633	3,854
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Age Analysis of Past Due Financing Receivables
Principal Balance Total Past Due	$ 138	$ 32	[2]
[1]	Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
[2]	Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

TDR's and Other Pertinent Infor

TDR's and Other Pertinent Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Summary of Troubled Debt Restructurings and other pertinent information
Tdrs Recorded Investment On Accrual Status	$ 16,983	$ 19,599
Tdrs Recorded Investment On Nonaccrual Status	22,209	24,766
Financing Receivable Recorded Investment Trouble Debt Restructuring	39,192	44,365
Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring		855
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring	$ 263	$ 63

Modification which Occurred Dur

Modification which Occurred During the Period & Change in Recorded Investment (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)contract	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	29	30	13
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 38,898	$ 4,908	$ 2,189
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 42,457	$ 4,967	$ 2,231
Commercial And Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	12	8	3
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 35,688	$ 732	$ 268
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 39,224	$ 732	$ 268
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	3	10	4
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,600	$ 2,865	$ 819
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,600	$ 2,865	$ 819
Small Business [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		10	1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 752	$ 14
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment		$ 728	$ 14
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	5	2	3
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,048	$ 559	$ 967
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,071	$ 642	$ 1,009
Home Equity Line of Credit [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9		2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 562		$ 121
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 562		$ 121

Impaired Loan Information by Po

Impaired Loan Information by Portfolio (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		$ 980	$ 1,079
Related Allowance		980	1,079
Recorded Investment		49,628	59,060
Unpaid Principal Balance		68,140	68,514
Average Recorded Investment	$ 63,522	59,682	63,522
Interest Income Recognized		1,537	1,554
Commercial and Industrial [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		126	7
Commercial Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		48	37
Construction Loans [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0
Small Business [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		8	1
Residential Real Estate [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		637	862
Home Equity [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		156	164
Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		5	8
With No Related Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment		39,242	47,900
Unpaid Principal Balance		56,605	56,125
Average Recorded Investment		49,077	51,970
Interest Income Recognized		1,090	1,111
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment		23,786	28,459
Unpaid Principal Balance		34,970	35,913
Average Recorded Investment		27,056	31,117
Interest Income Recognized		136	142
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment		6,213	9,552
Unpaid Principal Balance		12,101	9,832
Average Recorded Investment		12,595	10,561
Interest Income Recognized		523	519
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment		469	358
Unpaid Principal Balance		484	439
Average Recorded Investment		471	401
Interest Income Recognized		22	14
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment		4,976	4,518
Unpaid Principal Balance		5,123	4,686
Average Recorded Investment		5,045	4,597
Interest Income Recognized		222	212
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment		3,764	4,957
Unpaid Principal Balance		3,893	5,199
Average Recorded Investment		3,869	5,230
Interest Income Recognized		184	220
Related Allowance		0	0
With No Related Allowance Recorded [Member] | Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Recorded Investment		34	56
Unpaid Principal Balance		34	56
Average Recorded Investment		41	64
Interest Income Recognized		3	4
Related Allowance		0	0
With Allowance Recorded [Member]
Impaired loans by loan portfolio
Recorded Investment		10,386	11,160
Unpaid Principal Balance		11,535	12,389
Average Recorded Investment		10,605	11,552
Interest Income Recognized		447	443
With Allowance Recorded [Member] | Commercial and Industrial [Member]
Impaired loans by loan portfolio
Recorded Investment		670	370
Unpaid Principal Balance		670	370
Average Recorded Investment		718	385
Interest Income Recognized		29	19
With Allowance Recorded [Member] | Commercial Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment		2,124	1,287
Unpaid Principal Balance		2,124	1,287
Average Recorded Investment		2,176	1,311
Interest Income Recognized		122	74
With Allowance Recorded [Member] | Small Business [Member]
Impaired loans by loan portfolio
Recorded Investment		68	183
Unpaid Principal Balance		105	223
Average Recorded Investment		74	225
Interest Income Recognized		2	13
With Allowance Recorded [Member] | Residential Real Estate [Member]
Impaired loans by loan portfolio
Recorded Investment		6,252	8,188
Unpaid Principal Balance		7,163	9,217
Average Recorded Investment		6,326	8,459
Interest Income Recognized		239	289
With Allowance Recorded [Member] | Home Equity [Member]
Impaired loans by loan portfolio
Recorded Investment		1,184	991
Unpaid Principal Balance		1,382	1,149
Average Recorded Investment		1,214	1,018
Interest Income Recognized		52	43
With Allowance Recorded [Member] | Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio
Recorded Investment		88	141
Unpaid Principal Balance		91	143
Average Recorded Investment		97	154
Interest Income Recognized		$ 3	$ 5

Purchased Credit Impaired Loans

Purchased Credit Impaired Loans - Outstanding/Carrying Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 18,358
Financing Receivable, after Allowance for Credit Loss	6,119,185
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference	227
Financial Asset Acquired with Credit Deterioration [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 14,856	$ 8,795

LOANS, ALLOWANCE FOR LOAN LOS_4

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Unamortized Loan Commitment and Origination fees		$ 7,100,000
Unamortized Discounts or Premiums		21,600,000	$ 15,200,000
Days To Be Termed As Non Accrual Loans	90 days
Tdrs Recorded Investment On Nonaccrual Status	$ 22,209,000	24,766,000
Restructuring Cost and Reserve [Line Items]
Reserve for unfunded loan commitments		$ 2,100,000	$ 1,300,000

LOANS, ALLOWANCE FOR LOAN LOS_5

LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY Activity in the Accretable Yield PCI Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Loans, Allowance for Loan Losses and Credit Quality [Abstract]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions	$ 1,464
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	1,191
Accretion	(1,751)
Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	803	[1]
Ending balance	$ 1,934
[1]	Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s)

BANK PREMISES AND EQUIPMENT (De

BANK PREMISES AND EQUIPMENT (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total cost		$ 216,476	$ 218,921
Accumulated depreciation		(100,083)	(95,247)
Net bank premises and equipment		116,393	123,674
Depreciation expense		12,800	11,400	$ 9,100
Rental Income, Nonoperating	$ 1,600	1,500
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost		32,450	32,619
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Total cost		$ 63,544	62,455
Bank Premises [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		5 years
Bank Premises [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost		$ 38,667	35,498
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		27 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost		$ 81,815	77,705
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		2 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		12 years
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Total cost		$ 10,600	$ 10,644
Equipment Leased to Other Party [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		7 years

GOODWILL AND IDENTIFIABLE INT_3

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 506,206	$ 506,206	$ 256,105
Other Intangible Assets	23,107	29,286
Total goodwill and other intangible assets	529,313	535,492
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	22,215	28,016
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 892	$ 1,270

GOODWILL AND IDENTIFIABLE INT_4

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of year	$ 506,206
Acquisitions	0	$ 250,101
Balance at end of year	$ 506,206	$ 506,206

GOODWILL AND IDENTIFIABLE INT_5

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,054	$ 48,583
Accumulated Amortization	(17,947)	(19,297)
Net Carrying Amount	23,107	29,286
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,620	45,245
Accumulated Amortization	(16,405)	(17,229)
Net Carrying Amount	22,215	28,016
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,434	3,338
Accumulated Amortization	(1,542)	(2,068)
Net Carrying Amount	$ 892	$ 1,270

GOODWILL AND IDENTIFIABLE INT_6

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details 3) $ in Thousands	Dec. 31, 2020USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	$ 5,315
2020	4,539
2021	3,948
2022	3,162
2023	$ 2,329

GOODWILL AND IDENTIFIABLE INT_7

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details Textual) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2018	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 6,200,000	$ 2,700,000	$ 6,800,000
Weighted average amortization period for intangible assets	9 years 10 months 24 days

DEPOSITS (Details)

DEPOSITS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Deposit Liabilities Reclassified as Loans Receivable	$ 1,400	$ 5,000
Deposit Liabilities, Collateral Issued, Financial Instruments	419,600	323,100
Time Deposits, Fiscal Year Maturity [Abstract]
1 year or less	789,237	1,097,407
Over 1 year to 2 years	93,727	204,690
Over 2 years to 3 years	36,739	55,615
Over 3 years to 4 years	13,407	24,038
Over 4 years to 5 years	17,519	13,565
Time Deposits	$ 950,629	$ 1,395,315
1 year or less (as percent)	83.00%	78.60%
Over 1 years to 2 years (as percent)	9.90%	14.70%
Over 2 years to 3 years (as percent)	3.90%	4.00%
Over 3 years to 4 years (as percent)	1.40%	1.70%
Over 4 years to 5 years (as percent)	1.80%	1.00%
Time Deposits (as percent)	100.00%	100.00%
Deposits over $250,000.00	$ 202,200	$ 244,700

BORROWINGS (FHLB Advances) (Det

BORROWINGS (FHLB Advances) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months	$ 35,042	$ 104,976
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	1.12%	1.79%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two		$ 10,042
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date		2.95%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 35,042	$ 115,018
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	1.12%	1.89%
Debt Instrument, Unamortized Premium	$ 698	$ 730
Total Federal Home Loan Bank Advances	$ 35,740	$ 115,748

BORROWINGS (Long-Term Debt) (De

BORROWINGS (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 145,320	$ 187,355
Subordinated Debt	49,696	49,601
Secured Debt	32,773	74,906
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	51,510	51,507
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	5,258	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 6,083	$ 6,083

BORROWINGS (Trust Preferred Sec

BORROWINGS (Trust Preferred Securities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Face Amount	$ 61	$ 61
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	$ 50
Fixed rate	1.70%
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Fixed rate	2.84%
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Debt Instrument [Line Items]
Face Amount	$ 5.1
Basis spread on variable rate	2.66%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.44%
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Debt Instrument [Line Items]
Face Amount	$ 5.9
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Fixed rate	1.87%
Subordinated Debt [Member] | Subordinated Debentures Due in November 2019 [Member] [Domain]
Debt Instrument [Line Items]
Fixed rate		4.75%

BORROWINGS (Maturities of Long-

BORROWINGS (Maturities of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	$ 18,750
2016	14,023
2017	0
2018	0
2019	0
Thereafter	112,888
Long-term Debt, Gross	145,661
Long-term Debt [Member] | Long-term Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	18,750
2016	14,023
2017	0
2018	0
2019	0
Thereafter	0
Total		$ 32,773
Junior Subordinated Debentures [Member] | Capital Trust V Preferred Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	51,547
Total	51,547
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust I Securities Due in 2034 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	5,258
Total	5,258
Junior Subordinated Debentures [Member] | Central Bancorp Capital Trust II Securities Due in 2037 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	6,083
Total	6,083
Subordinated Debentures [Member] | Subordinated Debentures Due August 27, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	0
2016	0
2017	0
2018	0
2019	0
Subordinated Debentures [Member] | Subordinated note due 2029 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Thereafter	50,000
Total	$ 50,000

BORROWINGS (Details Textual)

BORROWINGS (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Subordinated Debt	$ 49,696,000	$ 49,601,000
Long-term Debt, Gross	145,661,000
Interest Expense, Long-term Debt	5,400,000	8,200,000	$ 4,200,000
Loans Pledged as Collateral	$ 2,100,000,000	$ 2,500,000,000
Federal Home Loan Bank Advances Weighted Average Interest Rate inclusive of Swaps	1.13%	1.88%
Securities Sold under Agreements to Repurchase	$ 0
Interest expense on short-term borrowings	0	$ 104,000	$ 248,000
Total Long-Term Borrowings	$ 145,320,000	187,355,000
Short-term Debt		50,000,000
Long-term Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt		32,773,000
Fixed rate	1.40%
Long-term Debt [Member] | Long-term Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	1.25%
Parent Company [Member] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Subordinated Debt	$ 50,000,000	50,000,000
Long-term Debt	50,000,000
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	51,547,000
Total Long-Term Borrowings	$ 51,510,000	$ 51,507,000
Fixed rate	1.70%
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	1.48%
Subordinated Debentures Due in November 2019 [Member] [Domain] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Fixed rate		4.75%
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 5,258,000
Total Long-Term Borrowings	$ 5,258,000	$ 5,258,000
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	2.66%
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	2.44%
Short-term Debt [Member] | LIBOR [Member] | Short-term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	1.15%
Line of Credit [Member] | Long-term Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 32,800,000	75,000,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal home loan bank unused remaining available borrowing capacity	1,400,000,000	$ 1,600,000,000
Line of credit maximum borrowing capacity	$ 5,000,000

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 34,641	$ 34,873	$ 24,902	$ 26,751	$ 47,477	$ 51,845	$ 30,628	$ 35,225	$ 121,167	$ 165,175	$ 121,622
Weighted Average Shares (in shares)
Basic Shares (in shares)	32,964,090	32,951,918	32,944,761	34,184,431	34,374,953	34,361,176	34,313,492	28,106,184	33,259,643	32,810,433	27,592,380
Effect of dilutive securities (in shares)	26,348	24,758	28,098	36,827	46,245	39,390	41,878	54,466	25,646	45,801	61,428
Weighted average common shares (diluted) (in shares)	32,990,438	32,976,676	32,972,859	34,221,258	34,421,198	34,400,566	34,355,370	28,160,650	33,285,289	32,856,234	27,653,808
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 3.64	$ 5.03	$ 4.41
Effect of Dilutive Securities (in dollars per share)									0	0	(0.01)
Diluted EPS (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 3.64	$ 5.03	$ 4.40

EARNINGS PER SHARE (Details 1)

EARNINGS PER SHARE (Details 1) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Performance Shares [Member]
Details of anti dilutive options to purchase common stock
Stock options	476	0	0
Stock options [Member]
Details of anti dilutive options to purchase common stock
Stock options	632	0	0

CUMULATIVELY GRANTED AWARDS (De

CUMULATIVELY GRANTED AWARDS (Details)	Dec. 31, 2020shares
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	1,650,000
Cumulative Granted, Net of Forfeitures and Expirations	1,251,119
Authorized but Unissued	398,881
2005 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	387,258
2005 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	863,861
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	314,600
Cumulative Granted, Net of Forfeitures and Expirations	139,745
Authorized but Unissued	0	[1]
2010 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	46,500
2010 Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	93,245
Two Thousand Eighteen Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Stock Awards	300,000
Cumulative Granted, Net of Forfeitures and Expirations	21,938
Authorized but Unissued	278,062	[1]
Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	0
Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Granted, Net of Forfeitures and Expirations	21,938
[1]	The Company may award up to a total of 300,000 shares from the 2018 Plan, inclusive of 174,855 shares that were Authorized but Unissued in the 2010 Plan, and were transferred from the 2010 Plan to the 2018 Plan. Due to this transfer, there are no available shares remaining to be issued from the 2010 Plan.

PRE TAX EXPENSE (Details 1)

PRE TAX EXPENSE (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense		$ 4,123	$ 4,403	$ 4,225
Related tax benefits recognized in earnings		1,159	1,238	1,188
Stock options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	[1]	0	23	66
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	[2]	3,272	3,679	3,299
Restricted stock awards [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based award expense	[1]	$ 851	$ 701	$ 860
[1]	Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense.
[2]	Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.

STOCK OPTION AWARDS DURING PERI

STOCK OPTION AWARDS DURING PERIOD (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	0
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Weighted average grant date fair value of options granted (per share)	$ 0		$ 13.46
April 3, 2018 | 2010 Plan [Member] | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			5,000
Vesting period			21 months
Investment Options, Expiration Date			Apr. 3, 2028
Expected volatility			21.15%
Expected life (years)			5 years 6 months
Expected dividend yield			1.94%
Risk free interest rate			2.62%
Weighted average grant date fair value of options granted (per share)			$ 13.46

RELEVANT STOCK OPTION INFORMATI

RELEVANT STOCK OPTION INFORMATION (Details 4) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from stock option exercises	$ 197	$ 281	$ 184
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options vested based on grant date fair value	22	21	85
Intrinsic value of stock options exercised	404	883	1,525
Cash received from stock option exercises	279	396	1,024
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	$ 114	$ 248	$ 429
Weighted average grant date fair value of options granted (per share)	$ 0		$ 13.46

STOCK OPTION ROLLFORWARD (Detai

STOCK OPTION ROLLFORWARD (Details 5) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Stock Option Awards, Outstanding (in shares):
Granted		0		0
Stock Option Awards, Nonvested (in shares)
Granted		0		0
Stock options [Member]
Stock Option Awards, Outstanding (in shares):
Balance outstanding at beginning of period		38,500
Granted		0
Exercised		(10,000)
Forfeited		0
Expired		0
Balance outstanding at end of period		28,500	[1]	38,500
Options outstanding, vested, and exercisable at December 31, 2020	[1]	28,500
Weighted Average Exercise Price, Outstanding (in usd per share):
Balance outstanding at beginning of period		$ 42.49
Granted		0
Exercised		27.90
Forfeited		0
Expired		0
Balance outstanding at end of period		47.61		$ 42.49
Options outstanding, vested, and exercisable at December 31, 2020		$ 47.61
Balance at December 31, 2020, Weighted average remaining contractual term (years)		3 years 11 months 26 days
Options outstanding and expected to vest at December 31, 2020, Weighted Average Remaining Contractual Term (years)		3 years 11 months 26 days
Balance at December 31, 2020, Aggregate Intrinsic Value	[2]	$ 704
Options outstanding and expected to vest at December 31, 2020, Aggregate Intrinsic Value	[2]	$ 704
Stock Option Awards, Nonvested (in shares)
Balance nonvested at beginning of period		1,666
Granted		0
Vested		(1,666)
Forfeited		0
Expired		0
Balance nonvested at end of period		0		1,666
Weighted Average Grant Date Fair Value, Nonvested (in dollars per share):
Balance nonvested at beginning of period		$ 13.46
Granted		0			$ 13.46
Vested		13.46
Forfeited		0
Expired		0
Balance nonvested at end of period		$ 0		$ 13.46
[1]	Inclusive of 20,000 vested stock options outstanding to Directors.
[2]	The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2020 of $72.33, which would have been received by in-the-money option holders had they all exercised their options as of that date.

RSA GRANTS (Details 6)

RSA GRANTS (Details 6) - $ / shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 70.55
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/27/2020 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		46,550
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 70.24
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 4/15/2020 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		880
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 70.02
Vesting terms		Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/21/2019 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			43,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 83.87
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 3/15/2019 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 79.55
Vesting terms			Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 4/1/2019 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			1,090
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 82.62
Vesting terms			Ratably over 3 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				39,950
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 71.75
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 2/27/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				1,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 72.60
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 5/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				530
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 74
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Employee Stock Plan [Member] | 11/15/2018 | Ratably Over Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				560
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 77.78
Vesting terms				Ratably over 5 years from grant date
Restricted stock awards [Member] | Non Employee Director Stock Plan Member | 5/22/2018 | Immediately upon grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 76.58
Vesting terms				Immediately upon grant date
Restricted stock awards [Member] | Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | 5/27/2020 | Immediately upon grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		9,438
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 72.86
Vesting terms		Immediately upon grant date
Restricted stock awards [Member] | Two Thousand Eighteen Nonemployee Director Stock Plan [Member] | 5/21/2019 | Immediately upon grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			6,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 77.08
Vesting terms			Immediately upon grant date
Performance Shares [Member] | Employee Stock Plan [Member] | 2/27/2020 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		17,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]	$ 70.24
Vesting terms		The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2023.
Performance Shares [Member] | Employee Stock Plan [Member] | 2/21/2019 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			15,900
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 83.87
Vesting terms			The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2022.
Performance Shares [Member] | Employee Stock Plan [Member] | 2/15/2018 | At The End of Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				16,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]			$ 71.75
Vesting terms				The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2021.
[1]	The fair value of the restricted stock awards are based upon the average of the high and low prices at which the Company’s common stock traded on the date of grant. The holders of time-vested restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting and dividend rights. The holders of performance-based restricted stock awards do not participate in the rewards of stock ownership of the Company until vested. The holders of all restricted stock awards are not required to pay any consideration to the Company for the awards.

FV OF RSA VESTS (Details 7)

FV OF RSA VESTS (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock awards upon vesting	$ 5,580	$ 6,005	$ 6,277

RSA ROLLFORWARD (Details 8)

RSA ROLLFORWARD (Details 8) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares
Oustanding (in shares):
Beginning balance	147,184
Ending balance	135,205
Restricted stock awards [Member]
Oustanding (in shares):
Beginning balance	193,784
Granted	73,968
Vested/Released	(75,197)
Forfeited	(11,050)
Ending balance	181,505	[1]
Weighted Average Grant Price (in usd per share):
Beginning balance | $ / shares	$ 67.45
Granted | $ / shares	70.55
Vested/Released | $ / shares	60.34
Forfeited | $ / shares	70.69
Ending balance | $ / shares	$ 71.46
Unrecognized compensation cost (inclusive of directors’ fees) | $	$ 7,787
Weighted average remaining recognition period (years)	2 years 11 months 15 days
[1]	Inclusive of 10,300 restricted stock awards outstanding to Directors.

STOCK BASED COMPENSATION (Detai

STOCK BASED COMPENSATION (Details Textual) - $ / shares		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		135,205		147,184
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value		$ 72.33
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		28,500	[1]	38,500
Options outstanding, vested, and exercisable at December 31, 2020	[1]	28,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares		0		1,666
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		181,505	[2]	193,784
Weighted average remaining recognition period (years)		2 years 11 months 15 days
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		20,000
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		10,300
Two Thousand Eighteen Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		300,000
Two Thousand Five Amended and Restated Employee Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		1,650,000
Two Thousand Ten Nonemployee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		314,600
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		174,855
[1]	Inclusive of 20,000 vested stock options outstanding to Directors.
[2]	Inclusive of 10,300 restricted stock awards outstanding to Directors.

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Amortization Of Deferred Hedge Gains Losses		$ 0	$ 0	$ 231
Notional amount of fair value hedged derivative				$ 0
Interest rate swaps on borrowings [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Fair Value	[1]	(1,341)	140
Derivative, Notional Amount		$ 75,000	$ 75,000
Derivative, Average Remaining Maturity		1 year 2 months 4 days	2 years 2 months 4 days
Derivative, Average Variable Interest Rate		0.22%	1.90%
Derivative, Average Fixed Interest Rate		1.53%	1.53%
Interest rate swaps on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Fair Value	[1]	$ 27,021	$ 12,907
Derivative, Notional Amount		$ 450,000	$ 450,000
Derivative, Average Remaining Maturity		2 years 7 months 28 days	3 years 7 months 28 days
Derivative, Average Variable Interest Rate		0.15%	1.76%
Derivative, Average Fixed Interest Rate		2.37%	2.37%
Interest rate collars on loans [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Fair Value	[1]	$ 21,764	$ 9,896
Derivative, Notional Amount		$ 400,000	$ 400,000
Derivative, Average Remaining Maturity		2 years 7 months 28 days	3 years 7 months 28 days
Derivative, Average Variable Interest Rate		0.15%	1.76%
Derivative, Cap Interest Rate		2.73%	2.73%
Derivative, Floor Interest Rate		2.20%	2.02%
Interest Rate Swap [Member]
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes
Fair Value	[1]	$ 47,444	$ 22,943
Derivative, Notional Amount		$ 925,000	$ 925,000
[1]	Beginning in 2020, the Company made an election to include accrued interest within fair value balances.

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands		Dec. 31, 2020USD ($)position	Dec. 31, 2019USD ($)position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	322	299
Less than 1 year		$ 102,999	$ 156,690
Less than 2 years		76,487	125,203
Less than 3 years		149,265	85,603
Less than 4 years		147,422	165,599
Thereafter		1,222,557	1,044,315
Derivative, Notional Amount		1,698,730	1,577,410
Fair Value	[2]	$ 127,226	$ 48,596
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	313	290
Less than 1 year		$ 102,999	$ 156,690
Less than 2 years		76,487	125,203
Less than 3 years		149,265	85,603
Less than 4 years		147,422	165,599
Thereafter		1,222,557	1,044,315
Derivative, Notional Amount		1,698,730	1,577,410
Fair Value	[2]	$ (127,216)	$ (48,591)
Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	33	40
Less than 1 year		$ 87,557	$ 91,434
Less than 2 years		5,300
Derivative, Notional Amount		92,857	91,434
Fair Value	[2]	$ (4,214)	$ (81)
Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	33	40
Less than 1 year		$ 87,557	$ 91,434
Less than 2 years		5,300
Derivative, Notional Amount		92,857	91,434
Fair Value	[2]	$ 4,224	$ 123
Risk Participated Out [Member] | Risk Participation Agreement [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	12
Less than 1 year		$ 6,721
Less than 3 years		2,675
Less than 4 years		7,307
Thereafter		93,378
Derivative, Notional Amount		110,081
Fair Value	[2]	$ 512
Risk Participated In [Member] | Risk Participation Agreement [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	[1]	8
Less than 2 years		$ 30,649
Less than 3 years		29,072
Thereafter		15,844
Derivative, Notional Amount		75,565
Fair Value	[2]	$ (118)
[1]	The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements
[2]	Beginning in 2020, the Company made an election to include accrued interest within fair value balances.

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Liability, Fair Value, Amount Offset Against Collateral		$ 6,713	$ 3,548
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Asset		187,422	78,385
Derivative Liability		117,959	53,923
Derivative Asset, Fair Value, Amount Offset Against Collateral		138,636	53,503
Interest Receivable		36,000
Derivative, Collateral, Obligation to Return Securities	[1]	48,786	24,882
Derivative, Collateral, Right to Reclaim Cash		62,460	25,493
Derivative, Collateral, Right to Reclaim Securities	[1]	48,786	24,882
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value		138,613	55,245
Total		187,399	78,385
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value		132,722	53,726
Total		134,064	53,923
Interest rate derivatives
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest Receivable		1,200	350
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest Rate Derivative Assets, at Fair Value	[2],[3]	48,786	23,140
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate derivatives	[4],[5]	1,342	197
Loan level swaps
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest Receivable		2,000	569
Loan level swaps | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	[2],[3]	127,228	52,374
Loan level swaps | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total	[4],[5]	127,218	52,369
Foreign exchange contracts | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total		4,359	1,191	[2]
Foreign exchange contracts | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total		4,349	1,149	[4]
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Forward sale hedge commitments	[2]	0	0
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Asset at Fair Value	[2]	0	0
Interest rate lock commitments	[2]	6,513	1,680
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Interest rate lock commitments	[4]	0	0
Forward sale hedge commitments	[4]	1	12
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Liability at Fair Value	[4]	1,035	196
CME [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Derivative, Collateral, Obligation to Return Cash	[6]	23	0
Derivative, Collateral, Right to Reclaim Cash	[6]	16,105	0
Risk Participation Agreement [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Credit Risk Derivative Assets, at Fair Value	[2]	513	0
Risk Participation Agreement [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Credit Risk Derivative Liabilities, at Fair Value	[4]	119	0
Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total		$ 187,399	78,385
Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Total			$ 78,385
[1]	Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.
[2]	All asset derivatives are located in other assets on the balance sheet
[3]	Approximately $1.2 million and $2.0 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2020. Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2019.
[4]	All liability derivatives are located in other liabilities on the balance sheet
[5]	Approximately $81,000 and $2.0 million of accrued interest payable is included in the fair value of interest rate and loan level derivative liabilities as of December 31, 2020. Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, at December 31, 2019.
[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 at December 31, 2020.

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent			$ 4,829
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 14,306	$ 2,346	1,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	(684)
Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		2,346
Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	3,896	1,296	56
Other Expense [Member] | Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0
Other Expense [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	(199)	(18)	(29)
Other Income [Member] | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income	90	39	46
Mortgage banking income | Derivatives not designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase Decrease In Fair Value Of Unhedged Derivative Instruments Relating To Residential Loans	4,005	1,275	39
Interest Expense [Member] | Derivatives designated as hedges: [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0
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	$ 16,797	$ 10,331	$ 4,829

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities (Textual) (Details) - USD ($)		3 Months Ended	12 Months Ended
		Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value			$ 79,800,000	$ 26,000,000
Derivative, Collateral, Right to Reclaim Cash			62,460,000	25,493,000
Increase (Decrease) in Loans Held-for-sale			1,296,000	822,000	$ (51,000)
Net amortization income			0	0	231,000
Exposure to Institutional Counterparties			$ 48,800,000	25,400,000
Maximum length of time Company is currently hedging its exposure			3 years 10 months 24 days
Customer related positions			$ 127,200,000	51,000,000
Gain (Loss) on Sales of Loans, Net		$ 0	30,100,000	13,200,000	$ 3,600,000
Fair Value Hedges, Net			0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax			(684,000)
Interest Receivable			36,000,000
Interest Income [Member]
Derivative [Line Items]
Interest expense			18,600,000
Interest Expense [Member]
Derivative [Line Items]
Interest expense			(997,000)
CME [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	[1]		16,105,000	0
Loan level swaps
Derivative [Line Items]
Interest Receivable			2,000,000	569,000
Interest Payable, Current			(2,000,000)	(569,000)
Interest Rate Swap [Member]
Derivative [Line Items]
Interest Receivable			1,200,000	350,000
Interest Payable, Current			$ (81,000)	$ (4,000)
[1]	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 at December 31, 2020.

BALANCE SHEET OFFSETTING (Detai

BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Derivative Asset		$ 187,422	$ 78,385
Derivative, Collateral, Obligation to Return Securities	[1]	48,786	24,882
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		138,636	53,503
Derivative Liability		117,959	53,923
Derivative, Collateral, Right to Reclaim Securities	[1]	48,786	24,882
Derivative, Collateral, Right to Reclaim Cash		62,460	25,493
Derivative Liability, Fair Value, Amount Offset Against Collateral		6,713	3,548
Other Assets [Member]
Offsetting Liabilities [Line Items]
Total		187,399	78,385
Other Assets [Member] | Loan level swaps
Offsetting Liabilities [Line Items]
Total	[2],[3]	127,228	52,374
Other Assets [Member] | Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Total		4,359	1,191	[2]
Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Interest Rate Derivative Assets, at Fair Value	[2],[3]	48,786	23,140
Other Liabilities [Member]
Offsetting Liabilities [Line Items]
Total		134,064	53,923
Other Liabilities [Member] | Loan level swaps
Offsetting Liabilities [Line Items]
Total	[4],[5]	127,218	52,369
Other Liabilities [Member] | Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Total		4,349	1,149	[4]
Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Interest rate derivatives	[4],[5]	$ 1,342	$ 197
[1]	Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.
[2]	All asset derivatives are located in other assets on the balance sheet
[3]	Approximately $1.2 million and $2.0 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2020. Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, at December 31, 2019.
[4]	All liability derivatives are located in other liabilities on the balance sheet
[5]	Approximately $81,000 and $2.0 million of accrued interest payable is included in the fair value of interest rate and loan level derivative liabilities as of December 31, 2020. Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, at December 31, 2019.

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current expense
Federal								$ 32,171	$ 27,980	$ 25,129
State								17,004	14,359	13,672
Total current expense								49,175	42,339	38,801
Deferred expense (benefit)
Federal								(10,872)	9,080	(3,080)
State								(6,634)	1,514	(1,417)
Total deferred expense (benefit)								(17,506)	10,594	(4,497)
Total expense	$ 11,199	$ 7,779	$ 2,148	$ 14,368	$ 17,036	$ 10,007	$ 11,522	$ 31,669	$ 52,933	$ 34,304

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed statutory federal income tax provision								$ 32,096	$ 45,803	$ 32,744
State taxes, net of federal tax benefit								$ 8,147	$ 12,262	$ 9,633
Effective Income Tax Rate Reconciliation, CARES Act, Percent								(3.15%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, CARES Act, Amount								$ 4,809	$ 0	$ 0
Merger and other related costs (non-deductible)								0	582	130
Change in valuation allowance								0	17	49
New Markets Tax Credits								0	(2,675)	(3,960)
Increase in cash surrender value of life insurance								(1,345)	(1,144)	(1,160)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount								(1,851)	(1,696)	(1,030)
Stock-based compensation								(1,067)	(824)	(885)
Nontaxable interest, net								(723)	(757)	(566)
Other, net								1,221	1,365	(651)
Total expense	$ 11,199	$ 7,779	$ 2,148	$ 14,368	$ 17,036	$ 10,007	$ 11,522	$ 31,669	$ 52,933	$ 34,304
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Computed statutory federal income tax provision								21.00%	21.00%	21.00%
State taxes, net of federal tax benefit								5.33%	5.63%	6.18%
Merger and other related costs (non-deductible)								0.00%	0.27%	0.08%
Change in valuation allowance								0.00%	0.01%	0.03%
New Markets Tax Credits								0.00%	(1.23%)	(2.54%)
Increase in cash surrender value of life insurance								(0.88%)	(0.52%)	(0.74%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent								(1.21%)	(0.78%)	(0.66%)
Stock-based compensation								(0.70%)	(0.38%)	(0.57%)
Nontaxable interest, net								(0.47%)	(0.35%)	(0.36%)
Other, net								0.80%	0.63%	(0.42%)
Total expense								20.72%	24.28%	22.00%

INCOME TAXES (Details 2)

INCOME TAXES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Deferred tax assets
Accrued expenses not deducted for tax purposes	$ 13,804	$ 13,855
Allowance for credit losses	32,265	18,993
Employee and director equity compensation	1,548	1,708
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	89	0
Loan basis difference fair value adjustment	4,791	6,804
Deferred Tax Assets, Operating Loss Carryforwards	226	2,546
Deferred Tax Asset, Operating Lease Liability	15,846
Operating Lease, Liability	56,356	16,393	$ 34,100
Other	999	1,311
Gross deferred tax assets	69,568	61,610
Deferred Tax Assets, Valuation Allowance	(280)	(187)
Deferred Tax Assets, Net of Valuation Allowance	69,288	61,423
Deferred tax liabilities
Core deposit and other intangibles	4,344	5,802
Deferred loan fees, net	336	4,944
Deferred Tax Liabilities, Derivatives	13,036	6,461
Fixed assets	7,786	8,194
Goodwill	10,947	10,645
Deferred Tax Liabilities Unrealized Gains on Available for Sale	4,152	0
Deferred Tax Liabilities, Prepaid Expenses	3,404	3,487
Deferred Tax Liabilities, Leasing Arrangements	12,979	15,911
Other	1,573	3,965
Gross deferred tax liabilities	58,557	59,409
Total net deferred tax asset	$ 10,731	$ 2,014

INCOME TAXES (Details 3)

INCOME TAXES (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 532	$ 215
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	58	127
Increase for current year tax positions		444
Ending Balance	$ 474	$ 532

INCOME TAXES (Details Textual)

INCOME TAXES (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 104,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	52,000	$ (10,000)	$ 24,000
Deferred Tax Assets, Operating Loss Carryforwards	$ 226,000	$ 2,546,000
Computed statutory federal income tax provision	21.00%	21.00%	21.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 95,000	$ 43,000		$ 53,000
Effective Income Tax Rate Reconciliation, CARES Act, Amount	(4,809,000)	$ 0	$ 0
Investments in Low Income Housing Projects [Member]
Deferred Tax Assets, Operating Loss Carryforwards	$ 280,000

LOW INCOME HOUSING PROJECT IN_3

LOW INCOME HOUSING PROJECT INVESTMENTS Low Income Housing Project Investments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Original Investment in Low Income Housing Projects		$ 128,752	$ 50,232	$ 96,275
Amortization Method Qualified Affordable Housing Project Investments		97,435		72,510	$ 33,681
Qualified Affordable Housing Project Investments, Commitment		49,586		$ 34,967	$ 3,935
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 7,342	9,404	5,407
Amortization Method Qualified Affordable Housing Project Investments, Amortization	5,645	7,552	4,377
Income (Loss) from Affordable Housing Projects, Equity Method Investments	$ 1,696	$ 1,851	$ 1,030

EMPLOYEE BENEFIT PLANS (Details

EMPLOYEE BENEFIT PLANS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Multiemployer Plans [Line Items]
Multiemployer Plans, Funded Status [Fixed List]	At least 80 percent	At least 80 percent
FIP/RP Status Pending/Implemented	No
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	N/A
Minimum Contributions Required for Future Periods	$ 0
Supplemental Executive Retirement Plans [Member]
Multiemployer Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	20,752,000	$ 17,361,000	$ 14,963,000	$ 15,749,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	1,224,000
Contributions paid	475,000	$ 486,000	$ 434,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	$ 1,214,000

Pension Plan Contributions (Det

Pension Plan Contributions (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Multiemployer Plans [Line Items]
Multiemployer Plan, Employer Contribution, Cost	$ 929	$ 2,063	$ 2,642
Multiemployer Plan Year Allocation Four [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Employer Contribution, Cost			2,000
Multiemployer Plan Year Allocation One [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Employer Contribution, Cost	$ 929
Multiemployer Plan Year Allocation Two [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Employer Contribution, Cost		$ 2,063
Multiemployer Plan Year Allocation Three [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Employer Contribution, Cost			$ 642

EMPLOYEE BENEFIT PLANS BHBK Pen

EMPLOYEE BENEFIT PLANS BHBK Pension Plan Benefits Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 19,100	$ 18,300
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12,225	11,653	$ 9,697
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	1,333	1,886
Employer contribution	0	505
Defined Benefit Plan, Plan Assets, Benefits Paid	761	435
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0
Defined Benefit Plan, Benefit Obligation	15,052	13,687	$ 10,824
Defined Benefit Plan, Interest Cost	416	424
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	1,710	2,874
Defined Benefit Plan, Benefit Obligation, Benefits Paid	761	435
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(2,827)	(2,034)
Defined Benefit Plan, Accumulated Benefit Obligation	$ 15,052	$ 13,687

EMPLOYEE BENEFIT PLANS BHBK P_2

EMPLOYEE BENEFIT PLANS BHBK Pension Plan Net Periodic Pension Benefit Cost (Details) - Other Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	$ 416	$ 424
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(908)	(780)
Defined Benefit Plan, Amortization of Gain (Loss)	541	327
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	176	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 225	$ (29)

EMPLOYEE BENEFIT PLANS BHBK Sch

EMPLOYEE BENEFIT PLANS BHBK Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 19,100	$ 18,300
Schedule of Allocation of Plan Assets [Table Text Block]		The fair value of major categories of the BHB Plan assets are summarized below: Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2020 (Dollars in thousands) Collective funds $ 1,300 1,300 $ — $ — Equity securities 3,239 3,239 — — Mutual funds 1,506 1,506 — — Total investments in the fair value hierarchy $ 6,045 $ 6,045 $ — $ — Investments measured at net asset value (1) 6,180 $ 12,225 Fair Value Measurements at Reporting Date Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs December 31, 2019 (Dollars in thousands) Collective funds $ 967 967 $ — $ — Equity securities 1,131 1,131 — — Mutual funds 3,628 3,628 — — Total investments in the fair value hierarchy $ 5,726 $ 5,726 $ — $ — Investments measured at net asset value (1) 5,927 $ 11,653 (1) Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments		$ 6,045	5,726
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments		0	0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments		0	0
Defined Benefit Plan, Common Collective Trust [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		1,300	967
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		1,300	967
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Mutual Fund [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		1,506	3,628
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		1,506	3,628
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		3,239	1,131
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		3,239	1,131
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount		0	0
Other Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		12,225	11,653	$ 9,697
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments		6,045	5,726
DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAssets	[1]	$ 6,180	$ 5,927
[1]	Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.

EMPLOYEE BENEFIT PLANS BHBK P_3

EMPLOYEE BENEFIT PLANS BHBK Pension Plan Expected Future Benefit Payments (Details) - Other Pension Plan [Member] $ in Thousands	Dec. 31, 2020USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 843
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	628
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	635
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	566
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	567
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 2,837

SERP Expense and Contributions

SERP Expense and Contributions paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	$ 1,900	$ 1,400	$ 1,100
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement expense	1,770	1,356	1,683
Contributions paid	$ 475	$ 486	$ 434

Expected future benefit payment

Expected future benefit payments under SERP (Details) - Supplemental Executive Retirement Plans [Member] $ in Thousands	Dec. 31, 2020USD ($)
Defined Benefit Plan Disclosure [Line Items]
2021	$ 472
2022	464
2023	576
2024	1,224
2025	1,214
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 5,921

SERP Benefits Table (Details)

SERP Benefits Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in plan assets
Fair value of plan assets at beginning of year	$ 18,300
Fair value of plan assets at end of year	19,100	$ 18,300
Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	17,361	14,963	$ 15,749
Service cost	505	433	459
Interest cost	518	601	533
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	2,843	1,850	(1,344)
Accumulated benefit obligation at end of year	20,752	17,361	14,963
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(475)	(486)	(434)
Change in plan assets
Employer contribution	475	486	434
Defined Benefit Plan, Plan Assets, Benefits Paid	(475)	(486)	(434)
Funded status at end of year	(20,752)	(17,361)	(14,963)
Assets for Plan Benefits, Defined Benefit Plan	0	0	0
Liabilities	(20,752)	(17,361)	(14,963)
Funded status at end of year	(20,752)	(17,361)	(14,963)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	5,881	3,509	1,705
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	218	494	770
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	6,099	4,003	2,475
Information for plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	20,752	17,361	14,963
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	20,752	17,361	14,963
Net periodic benefit cost
Service cost	505	433	459
Interest cost	518	601	533
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	276	276	276
Recognized net actuarial loss	471	46	415
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1,770	1,356	1,683
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Net actuarial loss	471	471	41
Net prior service cost	$ 276	$ 276	$ 276
Minimum [Member] | Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	0.43%	2.00%	3.24%
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.00%	3.24%	2.48%
Maximum [Member] | Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.18%	3.04%	4.09%
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.04%	4.09%	3.45%

EMPLOYEE BENEFIT PLANS (Detai_2

EMPLOYEE BENEFIT PLANS (Details Textual)	12 Months Ended
	Dec. 31, 2020USD ($)age	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Defined Contribution Plan Disclosure [Line Items]
Incentive plans and discretionary bonus expense	$ 11,000,000	$ 16,300,000	$ 13,800,000
Employer matching contribution percent	25.00%
Employee contribution percent	6.00%
Nondiscretionary requisite service period	1 year
Defined Contribution Plan, Nondiscretionary Requisite service hours	1,000
DefinedContributionPlanEmployerSafeHarborContributionAmount	3.00%
Nondiscretionary employer contribution, percent up to social security limit	2.00%
Nondiscretionary employer contribution, percent over social security limit	5.00%
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 101,000	180,000	142,000
Multiemployer Plans [Abstract]
Significance of contributions percentage	5.00%
Defined benefit plan expense	$ 1,900,000	1,400,000	1,100,000
Postretirement Benefits [Abstract]
Retirement age | age	65
Service period to be eligible for postretirement benefit	10 years
Death benefit	$ 5,000
Supplemental Executive Retirement Plans [Abstract]
Plan assets	19,100,000	18,300,000
401(k) Restoration Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	400,000	356,000	278,000
Employee Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	7,200,000	6,600,000	5,400,000
Executive Vice President [Member]
Defined Contribution Plan Disclosure [Line Items]
Supplemental Unemployment Benefits, Salary Continuation	$ 207,000	$ 295,000	287,000
Other Pension Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.11%	4.03%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	8.00%	8.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.35%	3.11%
Supplemental Executive Retirement Plans [Abstract]
Plan assets	$ 12,225,000	$ 11,653,000	$ 9,697,000
Minimum [Member] | Equity Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	47.00%
Minimum [Member] | Fixed Income Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	24.00%
Minimum [Member] | Other Investments [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	9.00%
Maximum [Member] | Equity Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	61.00%
Maximum [Member] | Fixed Income Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	38.00%
Maximum [Member] | Other Investments [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	21.00%

Recurring and Nonrecurring basi

Recurring and Nonrecurring basis (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading		$ 2,838	$ 2,179
Equity Securities, FV-NI		22,107	21,261
Debt Securities, Available-for-sale		412,860	426,424
US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		24,116	33,115
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		233,629	247,000
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		1,056	1,114
Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		61,081	54,795
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading		2,838	2,179
Assets and liabilities measured at fair value on a recurring basis
Assets and Liabilities Fair Value Disclosure Recurring		549,244	507,633
Fair Value, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		22,107	21,261
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		24,116	33,115
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		233,629	247,000
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		91,683	88,511
Fair Value, Recurring [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		807	1,396
Fair Value, Recurring [Member] | Single Issuer Trust Preferred Securities Issued By Banks [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		488	493
Fair Value, Recurring [Member] | Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		1,056	1,114
Fair Value, Recurring [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		61,081	54,795
Fair Value, Recurring [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		58,104	33,307
Fair Value, Recurring [Member] | Derivative Financial Instruments, Assets [Member]
Assets and liabilities measured at fair value on a recurring basis
Total		187,399	78,385
Fair Value, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		134,064	53,923
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading		2,838	2,179
Assets and liabilities measured at fair value on a recurring basis
Assets and Liabilities Fair Value Disclosure Recurring		24,945	23,440
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		22,107	21,261
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets and Liabilities Fair Value Disclosure Recurring		523,243	483,079
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		0	0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		24,116	33,115
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		233,629	247,000
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		91,683	88,511
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		807	1,396
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Single Issuer Trust Preferred Securities Issued By Banks [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		488	493
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		61,081	54,795
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		58,104	33,307
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Assets [Member]
Assets and liabilities measured at fair value on a recurring basis
Total			78,385
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		134,064	53,923
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets and Liabilities Fair Value Disclosure Recurring		1,056	1,114
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		0	0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		1,056	1,114
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		0	0
Fair Value, Nonrecurring [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets And Liabilities Fair Value Disclosure Nonrecurring		31,510	25,515
Fair Value, Nonrecurring [Member] | Collateral Dependent Loans [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure		31,510
Fair Value, Nonrecurring [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure	[1]		25,515
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets And Liabilities Fair Value Disclosure Nonrecurring		31,510	25,515
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateral Dependent Loans [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure	[1]	$ 31,510
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
Assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure			$ 25,515
[1]	Fair value 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.

Level 3 Reconciliation (Details

Level 3 Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pooled Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Beginning balance		$ 1,114	$ 1,329	$ 1,640
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)		(58)	(189)	(502)
Sales		0	(26)	191
Ending Balance		1,056	$ 1,114	$ 1,329
Collateral Dependent Loans [Member] | Fair Value, Nonrecurring [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure		31,510
Collateral Dependent Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Assets, Fair Value Disclosure	[1]	$ 31,510
[1]	Fair value 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.

Unobservable Inputs (Details)

Unobservable Inputs (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale		$ 412,860	$ 426,424
Weighted Average [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default		11.80%	13.50%
Loss Given Default		94.00%	93.60%
Cure Given Default		60.90%	60.90%
Pooled Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale		$ 1,056	$ 1,114
Pooled Trust Preferred Securities [Member] | Minimum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default		4.00%	2.00%
Loss Given Default		85.00%	85.00%
Cure Given Default		0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Cumulative Default		100.00%	100.00%
Loss Given Default		100.00%	100.00%
Cure Given Default		75.00%	75.00%
Fair Value, Nonrecurring [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	[1]		$ 25,515
Fair Value, Nonrecurring [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure			$ 25,515
Measurement Input, Constant Prepayment Rate [Member] | Weighted Average [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.024	0.026
Measurement Input, Constant Prepayment Rate [Member] | Pooled Trust Preferred Securities [Member] | Minimum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0	0
Measurement Input, Constant Prepayment Rate [Member] | Pooled Trust Preferred Securities [Member] | Maximum [Member] | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Quantitative Information [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.55	0.57
[1]	Fair value 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 disclosure only tabl

Fair value disclosure only table (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		$ 724,512	$ 740,806
Loans and Leases Receivable, Net Amount		9,279,474	8,805,899
Securities held to maturity, fair value		752,177	753,263
Federal Home Loan Bank Stock		10,250	14,424
Bank Owned Life Insurance		200,525	197,372
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks		35,740	115,748
Subordinated Debt		49,696	49,601
Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value		10,042,541	7,752,052
Accrued Liabilities, Fair Value Disclosure	[1]	10,042,541	7,752,052
Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value		950,629	1,395,315
Accrued Liabilities, Fair Value Disclosure	[2]	955,598	1,396,760
Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks		35,740	115,748
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[2]	35,885	115,881
Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Junior subordinated debentures (less unamortized debt issuance costs of $37 and $40)		62,851	62,848
Accrued Liabilities, Fair Value Disclosure	[3]	70,238	65,603
Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Subordinated Debt		49,696	49,601
Accrued Liabilities, Fair Value Disclosure	[2]	46,486	52,870
Long-term Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt		32,773	74,906
Long-term Debt, Fair Value	[2]	32,033	72,219
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value		0	0
Significant Other Observable Inputs (Level 2) [Member] | Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		10,042,541	7,752,052
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		955,598	1,396,760
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Borrowings, Fair Value Disclosure		35,885
Accrued Liabilities, Fair Value Disclosure			115,881
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		70,238	65,603
Significant Other Observable Inputs (Level 2) [Member] | Long-term Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value		32,033	72,219
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		46,486	52,870
Significant Unobservable Inputs (Level 3) [Member] | Long-term Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value		0	0
US Government Agencies Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity			12,874
Securities held to maturity, fair value	[4]		12,997
US Government Agencies Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			12,997
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		4,017	4,032
Securities held to maturity, fair value	[4]	4,077	4,053
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		4,077	4,053
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		356,085	397,414
Securities held to maturity, fair value	[4]	374,121	405,802
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		374,121	405,802
Collateralized Mortgage Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		335,993	293,662
Securities held to maturity, fair value	[4]	344,119	297,314
Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		344,119	297,314
Single Issuer Trust Preferred Securities Issued By Banks [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		1,500	1,500
Securities held to maturity, fair value	[4]	1,498	1,490
Single Issuer Trust Preferred Securities Issued By Banks [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		1,498	1,490
Small Business Administration Pooled Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		26,917	31,324
Securities held to maturity, fair value	[4]	28,362	31,607
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		28,362	31,607
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Loans Net Of Allowance For Loan Loses [Member]
Assets, Fair Value Disclosure [Abstract]
Loans and Leases Receivable, Net Amount		9,247,964	8,780,384
Loans, net of allowance for loan losses	[5]	9,253,381	8,613,635
Loans Net Of Allowance For Loan Loses [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses		9,253,381	8,613,635
Investment in Federal Home Loan Bank Stock [Member]
Assets, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Stock		10,250	14,424
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	10,250	14,424
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		0	0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		10,250	14,424
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		0	0
Cash Surrender Value [Member]
Assets, Fair Value Disclosure [Abstract]
Bank Owned Life Insurance		200,525	197,372
Cash Surrender Value, Fair Value Disclosure	[7]	200,525	197,372
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		0	0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		200,525	197,372
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		$ 0	$ 0
[1]	Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[2]	Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[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 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 (Details)

REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Other noninterest income - ASC 606									$ 4,235	$ 8,696	$ 4,432
Total noninterest income in scope of ASC 606									65,905	80,116	68,709
Total noninterest income out of scope of ASC 606									45,535	35,178	19,796
Noninterest Income	$ 27,468	$ 29,347	$ 28,190	$ 26,435	$ 33,297	$ 31,816	$ 28,648	$ 21,533	111,440	115,294	88,505
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									15,121	20,040	18,327
Credit Card, Merchant Discount [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									12,564	18,262	15,433
ATM Charge [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,476	3,224	2,961
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									27,157	25,940	23,441
Investment Advisory, Retail Investment and Insurance Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,275	2,779	2,714
Merchant Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,299	1,175	1,401
Credit Card Income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 778	$ 0	$ 0

REVENUE RECOGNITION CONTRACT WI

REVENUE RECOGNITION CONTRACT WITH CUSTOMER (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Investment Management Income Receivable	$ 4,636	$ 2,341

Reconciliation of changes in th

Reconciliation of changes in the components of OCI (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	[1]			$ (281)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		$ 26,588	$ 12,017	5,548
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	[1]			1,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	[1]			719
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent		(2,829)	(3,172)	1,422
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		36,994	16,725	7,717
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax		(10,406)	(4,708)	(2,169)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		14,306	2,346	1,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax		(4,023)	(660)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax		(684)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Tax		192
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, After Tax		(492)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax		176
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax		126
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax		(50)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		10,283	1,686
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax		23,372	14,379
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax		(6,575)	(4,048)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		16,797	10,331	4,829
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in fair value of securities available for sale, pre tax amount		(11,686)	(12,055)	5,923
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent				6,717
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax		(5,785)	(2,123)	1,521
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		982	(8)	372
Amortization of certain costs included in net periodic retirement costs, pre tax amount		(276)	(276)	(276)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	[2]	(4,351)	(1,855)	2,169
Total other comprehensive loss, pre tax amount		30,707	26,041	2,963
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		(2,829)	(2,761)	1,422
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent				(1,888)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		1,627	597	(428)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(276)	2	(105)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax		(78)	(78)	(78)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	[2]	1,223	521	(611)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent		(8,181)	(6,699)	(1,077)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax		8,857	9,294	(4,501)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		8,857	10,345	(4,501)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent				4,829
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax		(4,158)	(1,526)	1,093
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		706	(6)	267
Amortization of certain costs included in net periodic retirement costs, after tax amount		198	198	198
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	[2]	(3,128)	(1,334)	1,558
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		22,526	19,342	1,886
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	(1,462)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	411
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	(1,051)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent		$ 11,686	$ 13,517	$ (5,923)
[1]	Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, was recognized in earnings through December 2018, the original maturity date of the swap.
[2]	The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans

Accumulated other comprehensive

Accumulated other comprehensive income table (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment	[1]					$ 0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ 18,169		$ (1,173)	$ (1,831)
Total other comprehensive income (loss)		22,526		19,342	1,886
Ending Balance		40,695		18,169	(1,173)	(1,831)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,553	[2]			0	[3]
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment					(111)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		4,398		(5,947)	(504)
Total other comprehensive income (loss)		8,857		10,345	(4,501)
Ending Balance		13,255		4,398	(5,947)	(504)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total other comprehensive income (loss)		16,797
Unrealized Gain (Loss) on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment					205
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		16,479		6,148	948
Total other comprehensive income (loss)				10,331	4,995
Ending Balance		33,276		16,479	6,148	948
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment					29
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		0		0	137
Total other comprehensive income (loss)		0		0	(166)
Ending Balance		0		0	0	137
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment					(520)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(2,708)		(1,374)	(2,412)
Total other comprehensive income (loss)		(3,128)		(1,334)	1,558
Ending Balance		(5,836)		(2,708)	(1,374)	(2,412)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior Period Reclassification Adjustment					(397)	(397)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total other comprehensive income (loss)		$ 22,526		$ 19,342	$ 1,886
AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	[3]					$ (831)
[1]	Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act of 2017. Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.
[2]	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.
[3]	Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.

OTHER COMPREHENSIVE LOSS (Detai

OTHER COMPREHENSIVE LOSS (Details Textual) $ in Millions	Dec. 31, 2009USD ($)
Equity [Abstract]
Gain on interest rate swaps	$ 1.4

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		$ 16,083
Operating Lease, Cost	[1]	16,881	$ 10,718
Short-term Lease, Cost		16	116
Variable Lease, Cost		0	0
Lease, Cost		16,897	10,834
Lessee, Operating Lease, Liability, Payments, Due Year Two		10,725
Lessee, Operating Lease, Liability, Payments, Due Year Three		8,769
Lessee, Operating Lease, Liability, Payments, Due Year Four		7,237
Lessee, Operating Lease, Liability, Payments, Due Year Five		6,102
Lessee, Operating Lease, Liability, Payments, Due after Year Five		11,192
Lessee, Operating Lease, Liability, Payments, Due		60,108
Operating Lease, Liability, Undiscounted Excess Amount		3,752
Operating Lease, Liability		$ 56,356	$ 16,393	$ 34,100
[1]	(1) Operating lease cost for the year ended December 31, 2020 includes impairment losses associated with two branch closure decisions.

LEASES Textual (Details)

LEASES Textual (Details)	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 01, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	5 years 7 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	2.13%
Operating Lease, Right-of-Use Asset	$ 49,700,000	$ 56,600,000		$ 32,800,000
Property Subject to or Available for Operating Lease, Number of Units	97
Operating Lease, Impairment Loss	$ 4,163,000	$ 0	$ 0
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	10 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	1 year

COMMITMENTS AND CONTINGENCIES F

COMMITMENTS AND CONTINGENCIES Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$ 3,301,692	$ 3,337,930
Standby letters of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	20,686	21,565
Deferred standby letter of credit fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	164	158
Obligation to Repurchase Receivables Sold [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments	$ 303,265	$ 404,532

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details Textual) $ in Millions	Dec. 31, 2020USD ($)
Guarnator Obligations [Line Items]
Reserve requirement	$ 0

REGULATORY CAPITAL REQUIREMEN_3

REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$ 1,374,349	$ 1,352,341
Actual Ratio	0.1513	0.1483
Capital Required for Capital Adequacy	$ 726,482	$ 729,291
For Capital Adequacy Purposes Ratio	0.080	0.080
Common Equity Tier One Capital	$ 1,150,177	$ 1,171,963
Common Equity tier One Capital to Risk Weighted Assets	12.67%	12.86%
Common Equity Tier One Capital Required for Capital Adequacy	$ 408,646	$ 410,226
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 1,211,177	$ 1,232,963
Actual Ratio	0.1334	0.1353
For Capital Adequacy Purposes	$ 544,861	$ 546,969
For Capital Adequacy Purposes Ratio	0.060	0.060
Tier 1 capital (to average assets):
Actual	$ 1,211,177	$ 1,232,963
Actual Ratio	0.0956	0.1128
For Capital Adequacy Purposes	$ 506,805	$ 437,271
For Capital Adequacy Purposes Ratio	0.040	0.040
Bank [Member]
Total capital (to risk weighted assets):
Actual	$ 1,320,056	$ 1,275,611
Actual Ratio	0.1454	0.1400
Capital Required for Capital Adequacy	$ 726,313	$ 728,868
For Capital Adequacy Purposes Ratio	0.080	0.080
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 907,892	$ 911,085
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.100	0.100
Common Equity Tier One Capital	$ 1,206,566	$ 1,205,740
Common Equity tier One Capital to Risk Weighted Assets	13.29%	13.23%
Common Equity Tier One Capital Required for Capital Adequacy	$ 408,551	$ 409,988
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital to be Well Capitalized	$ 590,130	$ 592,205
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 1,206,566	$ 1,205,740
Actual Ratio	0.1329	0.1323
For Capital Adequacy Purposes	$ 544,735	$ 546,651
For Capital Adequacy Purposes Ratio	0.060	0.060
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 726,313	$ 728,868
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.080	0.080
Tier 1 capital (to average assets):
Actual	$ 1,206,566	$ 1,205,740
Actual Ratio	0.0954	0.1106
For Capital Adequacy Purposes	$ 505,747	$ 435,886
For Capital Adequacy Purposes Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Correction Action Provisions	$ 632,184	$ 544,857
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	0.050	0.050

REGULATORY CAPITAL REQUIREMEN_4

REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements (Details Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Dividends received from subsidiaries	$ 166	$ 181.7
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 61	$ 61

Parent Company Balance Sheet (D

Parent Company Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Other Assets		$ 551,289	$ 343,353
Derivative Asset		187,422	78,385
Total assets		13,204,301	11,395,165
Liabilities and stockholders’ equity
Subordinated debentures (less unamortized debt issuance costs of $304 and $399)		49,696	49,601
Derivative Liability		117,959	53,923
Other liabilities		327,386	236,552
Total liabilities		11,501,616	9,687,022
Stockholders’ equity		1,702,685	1,708,143	$ 1,073,490	$ 943,809
Liabilities and Equity		13,204,301	11,395,165
Parent Company [Member]
Assets:
Cash	[1]	100,604	135,688
Investments in subsidiaries	[2]	1,761,383	1,743,435
Prepaid income taxes		1,927	31,586
Other Assets		642	612
Derivative Asset	[1]		290
Total assets		1,864,556	1,911,611
Liabilities and stockholders’ equity
Dividends payable		15,164	15,126
Long-term Debt		32,773	74,906
Junior subordinated debentures (less unamortized debt issuance costs of $37 and $40)		62,851	62,848
Subordinated debentures (less unamortized debt issuance costs of $304 and $399)		49,696	49,601
Derivative Liability	[1]	569	0
Other liabilities		818	987
Total liabilities		161,871	203,468
Stockholders’ equity		1,702,685	1,708,143
Liabilities and Equity		1,864,556	1,911,611
Parent Company [Member] | Junior Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		37	40
Long-term Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		40	94
Long-term Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		40	94
Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		304	399
Subordinated Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		$ 304	$ 399
[1]	Entire balance eliminates in consolidation.
[2]	Majority of balance eliminates in consolidation

Parent Company Income Statement

Parent Company Income Statement (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenses
Interest expense		$ 5,362	$ 7,036	$ 8,867	$ 13,076	$ 13,710	$ 15,026	$ 16,125	$ 9,018	$ 34,341	$ 53,879	$ 25,536
Income tax benefit			11,199	7,779	2,148	14,368	17,036	10,007	11,522	31,669	52,933	34,304
Net Income		$ 34,641	$ 34,873	$ 24,902	$ 26,751	$ 47,477	$ 51,845	$ 30,628	$ 35,225	121,167	165,175	121,622
Parent Company [Member]
Income
Dividend Income, Operating	[1]									166,033	181,790	71,255
Total income										166,033	181,790	71,255
Expenses
Interest expense										5,432	8,236	4,234
Total expenses										5,432	8,236	4,234
Income before income taxes and equity in undistributed income of subsidiaries										160,601	173,554	67,021
Income tax benefit										(1,499)	(2,262)	(1,151)
Income of parent company										162,100	175,816	68,172
Equity (deficit) in undistributed income of subsidiaries										(40,933)	(10,641)	53,450
Net Income										$ 121,167	$ 165,175	$ 121,622
[1]	Majority of balance eliminates in consolidation.

Parent Company Cash Flow Statem

Parent Company Cash Flow Statement (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income		$ 34,641	$ 34,873	$ 24,902	$ 26,751	$ 47,477	$ 51,845	$ 30,628	$ 35,225	$ 121,167		$ 165,175	$ 121,622
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income tax expense										(17,506)		10,594	(4,497)
Change in other liabilities										76,140		19,283	7,100
Net cash provided by operating activities										64,636		216,522	141,837
Cash flows provided by (used) in investing activities
Net cash used in investing activities										(488,211)		20,160	(387,511)
Cash flows provided by (used in) financing activities
Proceeds from Lines of Credit										0		49,980	0
Repayments of Lines of Credit										0		(49,980)	0
Proceeds from Issuance of Subordinated Long-term Debt										0		49,526	0
Repayments of Subordinated Debt										0		(34,767)	0
Cash received from stock option exercises										197		281	184
Proceeds from shares issued under the direct stock purchase plan										2,132		4,951	2,712
Common dividends paid										(60,840)		(53,274)	(40,167)
Net cash provided by financing activities										1,569,237		(336,163)	283,013
Cash and cash equivalents at beginning of year					150,974				250,455	150,974		250,455	213,116
Cash and cash equivalents at end of period		1,296,636				150,974				1,296,636		150,974	250,455
Payments for Repurchase of Common Stock										(95,091)		0	0
RepaymentsOfJuniorSubordinatedDebt										0		(13,329)	0
Repayments of Long-term Debt										(42,187)
Proceeds from Issuance of Debt												74,867	0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries	[1]	1,761,383				1,743,435				1,761,383		1,743,435
Net income										121,167		165,175	121,622
Adjustments to reconcile net income to net cash provided by operating activities
Amortization										152		157	54
Deferred income tax expense										284		1,021	49
Change in prepaid income taxes and other assets										(475)	[2]	20,556	135
Change in other liabilities										(169)		(4,613)	6
Deficit (equity) in undistributed income of subsidiaries										40,933		10,641	(53,450)
Net cash provided by operating activities										161,892		192,937	68,416
Cash flows provided by (used) in investing activities
Cash paid for acquisitions, net of cash acquired (2)	[3]											(148,297)	(13,649)
Net cash used in investing activities										0		(148,297)	(13,649)
Cash flows provided by (used in) financing activities
Proceeds from Lines of Credit										0		49,980	0
Repayments of Lines of Credit										0		(49,980)	0
Proceeds from Issuance of Subordinated Long-term Debt										0		49,526	0
Restricted stock awards issued, net of awards surrendered										(1,187)		(1,463)	(1,371)
Cash received from stock option exercises										197		281	184
Proceeds from shares issued under the direct stock purchase plan										2,132		4,951	2,712
Common dividends paid										(60,840)		(53,274)	(40,167)
Net cash provided by financing activities										(196,976)		26,792	(38,642)
Net increase (decrease) in cash and cash equivalents										(35,084)		71,432	16,125
Cash and cash equivalents at beginning of year					$ 135,688				$ 64,256	135,688		64,256	48,131
Cash and cash equivalents at end of period		100,604				135,688				100,604		135,688	64,256
Cash	[4]	100,604				$ 135,688				100,604		135,688
Payments for Repurchase of Common Stock										(95,091)
RepaymentsOfJuniorSubordinatedDebt										0		(13,329)	0
Repayments of Long-term Debt										(42,187)
Proceeds from Issuance of Debt												74,867	0
Reallocation of tax asset from parent to bank subsidiary, noncash adjustment		$ 30,100								30,100
Subordinated Debt [Member] | Parent Company [Member]
Cash flows provided by (used in) financing activities
Repayments of Subordinated Debt										$ 0		$ (34,767)	$ 0
[1]	Majority of balance eliminates in consolidation
[2]	Reflected in this line for the year ended December 31, 2020 is a noncash adjustment which decreased prepaid income taxes and increased investment in subsidiary by $30.1 million, which represents a reallocation of a tax asset from the parent to the bank subsidiary.
[3]	The majority of the net assets acquired at the parent company level represent each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation
[4]	Entire balance eliminates in consolidation.

SELECTED QUARTERLY FINANCIAL _3

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income	$ 96,805	$ 97,919	$ 99,965	$ 107,380	$ 113,703	$ 119,624	$ 122,144	$ 91,543		$ 402,069	$ 447,014	$ 323,701
Interest expense	5,362	7,036	8,867	13,076	13,710	15,026	16,125	9,018		34,341	53,879	25,536
Net interest income	91,443	90,883	91,098	94,304	99,993	104,598	106,019	82,525		367,728	393,135	298,165
Provision for Loan and Lease Losses	0	7,500	20,000	25,000	4,000	0	1,000	1,000	$ 4,775	52,500	6,000	4,775
Total noninterest income	27,468	29,347	28,190	26,435	33,297	31,816	28,648	21,533		111,440	115,294	88,505
Total noninterest expenses	73,727	66,658	66,607	66,840	67,445	67,533	93,032	56,311		273,832	284,321	225,969
Current Federal, State and Local, Tax Expense (Benefit)	10,543
Provision for income taxes		11,199	7,779	2,148	14,368	17,036	10,007	11,522		31,669	52,933	34,304
Net Income	$ 34,641	$ 34,873	$ 24,902	$ 26,751	$ 47,477	$ 51,845	$ 30,628	$ 35,225		$ 121,167	$ 165,175	$ 121,622
Basic earnings per share (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25		$ 3.64	$ 5.03	$ 4.41
Diluted earnings per share (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25		$ 3.64	$ 5.03	$ 4.40
Weighted average common shares (basic) (in shares)	32,964,090	32,951,918	32,944,761	34,184,431	34,374,953	34,361,176	34,313,492	28,106,184		33,259,643	32,810,433	27,592,380
Common share equivalents (in shares)	26,348	24,758	28,098	36,827	46,245	39,390	41,878	54,466		25,646	45,801	61,428
Weighted average common shares (diluted) (in shares)	32,990,438	32,976,676	32,972,859	34,221,258	34,421,198	34,400,566	34,355,370	28,160,650		33,285,289	32,856,234	27,653,808
Gain (Loss) on Sales of Loans, Net		$ 0								$ 30,100	$ 13,200	$ 3,600
Total Unusual or infrequent Income Items	$ 0	0	$ 0	$ 0	$ 0	$ 951	$ 0	$ 0
Acquisition Related Costs	0	0		0		705	24,696	1,032		0	26,433	11,168
Adjustment for tax effect of previously incurred M&A expense				0
Total unusual or infrequent expense items	$ 0	684	$ 0	$ 0	$ 0	$ 705	$ 24,696	$ 1,682
Loss on Contract Termination		$ 684								$ 684	$ 0	$ 0

TRANSACTIONS WITH RELATED PAR_3

TRANSACTIONS WITH RELATED PARTIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Loans and Leases Receivable, Related Parties	$ 26,343	$ 55,830	$ 41,170
Loans and Leases Receivable, Related Parties, Additions	45,308	49,771
Loans and Leases Receivable, Related Parties, Collections	$ (74,795)	$ (35,111)

TRANSACTIONS WITH RELATED PAR_4

TRANSACTIONS WITH RELATED PARTIES Related Parties Textual (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Nonaccrual/TDR Loans, with related parties	$ 0	$ 0
Loans and Leases Receivable, Related Parties, Additions		0
Related Party Deposit Liabilities	$ 22,900,000	$ 13,000,000

Uncategorized Items - indb-2020

Label	Element	Value
Deferred Rent Credit	us-gaap_DeferredRentCredit	$ 1,300,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	32,777,000	[1]
Retained Earnings [Member]
Prior Period Reclassification Adjustment	us-gaap_PriorPeriodReclassificationAdjustment	$ 397,000	[2]
[1]	Represents adjustment needed to reflect the opening balance of the Company's Right of Use ("ROU") assets and lease liabilities pursuant to the adoption of Accounting Standards Update 2016-02 effective January 1, 2019. Upon adoption, the Company recognized on its balance sheet ROU assets of approximately 32.8 million, with a corresponding operating lease liability of approximately 34.1 million, with an adjustment to remove the Company's existing deferred rent liability of approximately 1.3 million.
[2]	Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act of 2017. Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.