Berkshire Hills Bancorp (BHLB) 10-K 1 Mar 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 25, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-15781
Entity Registrant Name	BERKSHIRE HILLS BANCORP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3510455
Entity Address, Address Line One	60 State Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02109
City Area Code	617
Local Phone Number	641-9206
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	BHLB
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 548
Entity Common Stock, Shares Outstanding (in shares)		51,035,606
Documents Incorporated by Reference	Portions of the Proxy Statement for the 2021 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K.
Entity Central Index Key	0001108134
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Filer Category	Accelerated Filer

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 91,219	$ 105,447
Short-term investments	1,466,656	474,382
Total cash and cash equivalents	1,557,875	579,829
Trading Security	9,708	10,769
Marketable equity securities, at fair value	18,513	41,556
Securities available for sale, at fair value	1,695,232	1,311,555
Securities held to maturity (fair values of $491,855 in 2020 and $373,277 in 2019)	465,091	357,979
Federal Home Loan Bank stock and other restricted securities	34,873	48,019
Total securities	2,223,417	1,769,878
Less: Allowance for credit losses on investment	(104)	0
Net Securities	2,223,313	1,769,878
Loans held for sale	17,748	36,664
Total loans	8,081,519	9,502,428
Less: Allowance for credit losses on loans	(127,302)	(63,575)
Net loans	7,954,217	9,438,853
Other real estate owned	149	0
Goodwill	0	553,762
Other intangible assets	34,819	45,615
Cash surrender value of bank-owned life insurance	232,695	227,894
Other assets	387,230	312,767
Total assets	12,838,013	13,215,970
Liabilities
Demand deposits	2,484,249	1,884,100
NOW and other deposits	1,003,005	1,492,569
Money market deposits	3,371,353	2,528,656
Savings deposits	972,116	841,283
Time deposits	2,385,085	3,589,369
Total deposits	10,215,808	10,335,977
Short-term debt	40,000	125,000
Long-term Federal Home Loan Bank advances	434,357	605,501
Subordinated notes	97,280	97,049
Total borrowings	571,637	827,550
Total liabilities	11,650,240	11,457,406
Shareholders’ equity
Preferred Stock (Series B non-voting convertible preferred stock - $0.01 par value; 2,000,000 shares authorized, no shares issued and outstanding in 2020; 2,000,000 shares authorized, 521,607 shares issued and outstanding in 2019)	0	40,633
Common stock ($0.01 par value; 100,000,000 shares authorized and 51,903,190 shares issued and 50,833,087 shares outstanding in 2020; 100,000,000 shares authorized; 51,903,190 shares issued, and 49,585,143 shares outstanding in 2019)	528	517
Additional paid-in capital - common stock	1,427,239	1,422,441
Unearned compensation	(6,245)	(8,465)
Retained (deficit) earnings	(233,344)	361,082
Accumulated other comprehensive income/(loss)	30,871	11,993
Treasury stock, at cost (1,070,103 shares in 2020 and 2,318,047 shares in 2019)	(31,276)	(69,637)
Total shareholders’ equity	1,187,773	1,758,564
Total liabilities and shareholders’ equity	12,838,013	13,215,970
Disposal Group, Held-for-sale, Not Discontinued Operations
Assets
Assets from discontinued operations	317,304	0
Liabilities
Liabilities from discontinued operations	630,065	0
Discontinued Operations
Assets
Assets from discontinued operations	0	154,132
Liabilities
Liabilities from discontinued operations	0	26,481
Continuing Operations
Assets
Premises and equipment, net	112,663	120,398
Other assets	387,230	288,945
Liabilities
Other liabilities	232,730	267,398
Discontinued Operations
Assets
Premises and equipment, net	0	1,073
Other assets	0	23,822
Liabilities
Other liabilities	$ 0	$ 26,481

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities held to maturity	$ 491,855	$ 373,277
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	100,000,000	100,000,000
Common stock, shares issued (shares)	51,903,190	51,903,190
Common stock, shares outstanding (shares)	50,833,087	49,585,143
Treasury stock, shares (shares)	1,070,103	2,318,047
Series B Convertible Preferred Stock
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	2,000,000	2,000,000
Preferred stock, shares issued (shares)	0	521,607
Preferred stock, shares outstanding (shares)	0	521,607

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividend income
Loans	$ 358,015,000	$ 448,927,000	$ 406,222,000
Securities and other	51,767,000	60,586,000	59,672,000
Total interest and dividend income	409,782,000	509,513,000	465,894,000
Interest expense
Deposits	72,715,000	115,193,000	78,364,000
Borrowings and subordinated notes	20,285,000	29,062,000	31,330,000
Total interest expense	93,000,000	144,255,000	109,694,000
Net interest income	316,782,000	365,258,000	356,200,000
Non-interest income
Other	2,597,000	1,438,000	3,557,000
(Loss)/gain on securities, net	(7,520,000)	4,389,000	(3,719,000)
Gain on sale of business operations and assets, net	1,240,000	1,351,000	460,000
Total non-interest income	66,307,000	84,002,000	74,324,000
Total net revenue	383,089,000	449,260,000	430,524,000
Provision for credit losses	75,878,000	35,419,000	25,451,000
Non-interest expense
Compensation and benefits	147,840,000	140,906,000	134,019,000
Occupancy and equipment	43,359,000	39,586,000	36,927,000
Technology and communications	32,364,000	26,523,000	27,147,000
Marketing and promotion	3,703,000	4,474,000	4,697,000
Professional services	11,907,000	10,798,000	7,343,000
FDIC premiums and assessments	5,876,000	3,861,000	5,734,000
Other real estate owned and foreclosures	125,000	154,000	68,000
Amortization of intangible assets	6,181,000	5,783,000	4,934,000
Goodwill impairment	553,762,000	0	0
Merger, restructuring and conversion related expenses	5,839,000	28,046,000	22,144,000
Other	29,283,000	29,726,000	23,880,000
Total non-interest expense	840,239,000	289,857,000	266,893,000
(Loss)/income from continuing operations before income taxes	(533,028,000)	123,984,000	138,180,000
Net (loss)/income from continuing operations	(513,175,000)	101,521,000	109,219,000
(Loss) from discontinued operations before income taxes	(26,855,000)	(5,539,000)	(4,767,000)
Income tax (benefit) from discontinued operations	(7,013,000)	(1,468,000)	(1,313,000)
Net (loss) from discontinued operations	(19,842,000)	(4,071,000)	(3,454,000)
Net (loss)/income	(533,017,000)	97,450,000	105,765,000
Preferred stock dividend	313,000	960,000	918,000
(Loss)/income available to common shareholders	$ (533,330,000)	$ 96,490,000	$ 104,847,000
Basic (loss)/earnings per share:
Continuing operations (in USD per share)	$ (10.21)	$ 2.06	$ 2.38
Discontinued operations (USD per share)	(0.39)	(0.08)	(0.08)
Total basic (loss)/earnings per share (in USD per share)	(10.60)	1.98	2.30
Diluted (loss)/earnings per share:
Continuing operations (in USD per share)	(10.21)	2.05	2.36
Discontinued operations (USD per share)	(0.39)	(0.08)	(0.07)
Total diluted (loss)/earnings per share (in USD per share)	$ (10.60)	$ 1.97	$ 2.29
Weighted average common shares outstanding:
Basic (in shares)	50,270	49,263	46,024
Diluted (in shares)	50,270	49,421	46,231
Continuing Operations
Non-interest expense
Income tax (benefit)/expense from continuing operations	$ (19,853,000)	$ 22,463,000	$ 28,961,000
Total fee income
Interest expense
Fees and commissions, mortgage banking and service	69,990,000	76,824,000	74,026,000
Mortgage banking income
Interest expense
Fees and commissions, mortgage banking and service	5,190,000	788,000	635,000
Loan related income
Interest expense
Fees and commissions, mortgage banking and service	16,840,000	24,374,000	23,155,000
Deposit related fees
Interest expense
Fees and commissions, mortgage banking and service	27,905,000	31,352,000	29,806,000
Insurance commissions and fees
Interest expense
Fees and commissions, mortgage banking and service	10,770,000	10,957,000	10,983,000
Wealth management fees
Interest expense
Fees and commissions, mortgage banking and service	$ 9,285,000	$ 9,353,000	$ 9,447,000

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 (loss)/income	$ (533,017)	$ 97,450	$ 105,765
Other comprehensive income (loss), before tax:
Changes in unrealized gains and losses on securities available-for-sale	25,726	34,530	(16,923)
Changes in unrealized gains and losses on pension	(489)	(270)	336
Total other comprehensive income/(loss), before tax	25,237	34,260	(16,587)
Income taxes related to other comprehensive income (loss):
Changes in unrealized gains and losses on securities available-for-sale	(6,471)	(8,873)	4,421
Changes in unrealized gains and losses on pension	112	76	(108)
Total income tax (expense) benefit related to other comprehensive income (loss)	(6,359)	(8,797)	4,313
Total other comprehensive income/(loss)	18,878	25,463	(12,274)
Total comprehensive (loss)/income	$ (514,139)	$ 122,913	$ 93,491

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional paid-in capital	Unearned compensation	Retained earnings	Retained earningsCumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive (loss) income	Accumulated other comprehensive (loss) incomeCumulative Effect, Period of Adoption, Adjustment	Treasury stock
Beginning balance (in shares) at Dec. 31, 2017			522	45,290
Beginning balance at Dec. 31, 2017	$ 1,496,264		$ 40,633	$ 460	$ 1,242,487	$ (6,531)	$ 239,179		$ 4,161		$ (24,125)
Beginning balance (Accounting Standards Update 2016-01) at Dec. 31, 2017		$ 0						$ 6,253		$ (6,253)
Comprehensive income:
Net (loss)/income	105,765						105,765
Other comprehensive income (loss)	(12,274)								(12,274)
Total comprehensive (loss)/income	93,491						105,765		(12,274)
Adoption of ASU No 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	0						(896)		896
Cash dividends declared on common shares	(39,966)						(39,966)
Cash dividends declared on preferred shares	(918)						(918)
Forfeited shares (in shares)				(65)
Forfeited shares	0				90	2,189					(2,279)
Exercise of stock options (in shares)				33
Exercise of stock options	326						(578)				904
Restricted stock grants (in shares)				185
Restricted stock grants	0				2,157	(7,011)					4,854
Stock-based compensation	4,759					4,759
Other, net (in shares)				(26)
Other, net	(1,038)				279		0				(1,317)
Ending balance (shares) at Dec. 31, 2018			522	45,417
Ending balance at Dec. 31, 2018	1,552,918		$ 40,633	$ 460	1,245,013	(6,594)	308,839		(13,470)		(21,963)
Comprehensive income:
Net (loss)/income	97,450						97,450
Other comprehensive income (loss)	25,463								25,463
Total comprehensive (loss)/income	$ 122,913						97,450		25,463
Accounting standards update	us-gaap:AccountingStandardsUpdate201613Member
Acquisition of SI Financial Group, Inc (in shares)				5,691
Acquisition of SI Financial Group, Inc.	$ 176,712			$ 57	176,655
Cash dividends declared on common shares	(44,147)						(44,147)
Cash dividends declared on preferred shares	(960)						(960)
Treasury stock purchased (in shares)				1,726
Treasury stock purchased	(52,746)										(52,746)
Forfeited shares (in shares)				(65)
Forfeited shares	0				(251)	2,160					(1,909)
Exercise of stock options (in shares)				11
Exercise of stock options	188						(100)				288
Restricted stock grants (in shares)				299
Restricted stock grants	0				932	(8,843)					7,911
Stock-based compensation	4,812					4,812
Other, net (in shares)				(42)
Other, net	(1,126)				92						(1,218)
Ending balance (shares) at Dec. 31, 2019			522	49,585
Ending balance at Dec. 31, 2019	1,758,564	$ (24,380)	$ 40,633	$ 517	1,422,441	(8,465)	361,082	$ (24,380)	11,993		(69,637)
Comprehensive income:
Net (loss)/income	(533,017)						(533,017)
Other comprehensive income (loss)	18,878								18,878
Total comprehensive (loss)/income	(514,139)						(533,017)		18,878
Conversion of preferred stock to common shares (in shares)			(522)	1,043
Conversion of preferred stock to common stock	0		$ (40,633)	$ 11	10,395						30,227
Cash dividends declared on common shares	(36,251)						(36,251)
Cash dividends declared on preferred shares	(313)						(313)
Treasury stock purchased (in shares)				(14)
Treasury stock purchased	(473)										(473)
Forfeited shares (in shares)				(91)
Forfeited shares	0				(1,570)	2,727					(1,157)
Exercise of stock options (in shares)				37
Exercise of stock options	664						(465)				1,129
Restricted stock grants (in shares)				314
Restricted stock grants	0				(4,121)	(5,234)					9,355
Stock-based compensation	4,727			$ 0		4,727
Other, net (in shares)				(41)
Other, net	(626)				94						(720)
Ending balance (shares) at Dec. 31, 2020			0	50,833
Ending balance at Dec. 31, 2020	$ 1,187,773		$ 0	$ 528	$ 1,427,239	$ (6,245)	$ (233,344)		$ 30,871		$ (31,276)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, common stock (USD per share)	$ 0.72	$ 0.92	$ 0.88
Cash dividends declared, preferred stock (USD per share)	$ 1.20	$ 1.84	$ 1.76

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss)/income from continuing operations	$ (513,175,000)	$ 101,521,000	$ 109,219,000
Net (loss) from discontinued operations	(19,842,000)	(4,071,000)	(3,454,000)
Net (loss)/income	(533,017,000)	97,450,000	105,765,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	75,878,000	35,419,000	25,451,000
Net amortization of securities	2,513,000	2,407,000	2,837,000
Change in unamortized net loan origination costs and premiums	21,856,000	12,759,000	(1,004,000)
Premises and equipment depreciation and amortization expense	11,919,000	10,921,000	10,442,000
Stock-based compensation expense	4,727,000	4,812,000	4,759,000
Accretion of purchase accounting entries, net	(10,377,000)	(14,813,000)	(24,000,000)
Amortization of other intangibles	6,181,000	5,783,000	4,934,000
Income from cash surrender value of bank-owned life insurance policies	(5,354,000)	(5,349,000)	(6,232,000)
Securities losses/(gains), net	7,576,000	(4,389,000)	3,719,000
Net change in loans held-for-sale	(4,267,000)	(5,137,000)	1,460,000
Loss on disposition of assets	327,000	3,443,000	152,000
Loss on sale of real estate	13,000	5,000	0
Amortization of interest in tax-advantaged projects	3,645,000	6,455,000	4,618,000
Goodwill impairment	553,762,000	0	0
Net change in other	(31,247,000)	(23,418,000)	30,601,000
Net cash provided by operating activities of continuing operations	123,977,000	130,419,000	166,956,000
Net cash provided/(used) by operating activities of discontinued operations	103,664,000	(18,894,000)	55,298,000
Net cash provided by operating activities	227,641,000	111,525,000	222,254,000
Cash flows from investing activities:
Net decrease in trading security	734,000	701,000	665,000
Purchases of marketable equity securities	(17,631,000)	(23,841,000)	(24,538,000)
Proceeds from sales of marketable equity securities	33,928,000	43,075,000	38,104,000
Purchases of securities available for sale	(885,182,000)	(119,671,000)	(257,547,000)
Proceeds from sales of securities available for sale	69,337,000	136,229,000	499,000
Proceeds from maturities, calls, and prepayments of securities available for sale	457,586,000	240,586,000	188,076,000
Purchases of securities held to maturity	(144,651,000)	(7,260,000)	(15,391,000)
Proceeds from maturities, calls, and prepayments of securities held to maturity	35,331,000	21,602,000	36,746,000
Net change in loans	1,054,029,000	694,657,000	(801,876,000)
Acquisitions, net of cash paid	0	110,774,000	0
Proceeds from surrender of bank-owned life insurance	553,000	2,451,000	854,000
Purchase of Federal Home Loan Bank stock	(6,741,000)	(112,208,000)	(76,090,000)
Proceeds from sales of Federal Home Loan Bank stock	19,887,000	149,455,000	61,831,000
Net investment in limited partnership tax credits	(7,280,000)	(4,387,000)	(4,724,000)
Purchase of premises and equipment, net	(7,208,000)	(10,565,000)	(9,349,000)
Proceeds from sales of seasoned commercial loan portfolios	37,988,000	81,147,000	0
Proceeds from sales of other real estate owned	171,000	150,000	1,600,000
Net investing cash flows provided/(used) by discontinued operations	252,000	(313,000)	(377,000)
Net cash provided/(used) by investing activities	641,103,000	1,202,582,000	(861,517,000)
Cash flows from financing activities:
Net increase in deposits	499,657,000	23,996,000	233,704,000
Proceeds from Federal Home Loan Bank advances and other borrowings	326,277,000	5,384,982,000	4,767,766,000
Repayments of Federal Home Loan Bank advances and other borrowings	(582,648,000)	(6,228,780,000)	(4,387,223,000)
Purchase of treasury stock	(473,000)	(52,746,000)	0
Exercise of stock options	664,000	188,000	326,000
Common and preferred stock cash dividends paid	(36,564,000)	(45,107,000)	(40,884,000)
Settlement of derivative contracts with financial institution counterparties	(97,611,000)	0	0
Net cash provided/(used) by financing activities	109,302,000	(917,467,000)	573,689,000
Net change in cash and cash equivalents	978,046,000	396,640,000	(65,574,000)
Cash and cash equivalents at beginning of year	579,829,000	183,189,000	248,763,000
Cash and cash equivalents at end of year	1,557,875,000	579,829,000	183,189,000
Supplemental cash flow information:
Interest paid on deposits	82,319,000	119,695,000	74,565,000
Interest paid on borrowed funds	21,277,000	33,406,000	32,274,000
Income taxes (refunded)/paid, net	(13,864,000)	19,818,000	3,029,000
Acquisition of non-cash assets and liabilities:
Assets acquired	0	1,595,054,000	0
Liabilities assumed	0	(1,530,010,000)	0
Other net comprehensive income/(loss)	18,878,000	25,463,000	(12,274,000)
Reclass of seasoned loan portfolios to held-for-sale, net	(14,845,000)	(120,307,000)	0
Real estate owned acquired in settlement of loans	224,000	0	1,600,000
Retained earnings
Cash flows from operating activities:
Net (loss)/income	(533,017,000)	97,450,000	105,765,000
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
Impact to retained earnings from adoption of ASC 326, net of tax		24,380,000
Discontinued Operations, Held-for-sale | Mid-Atlantic Branch Sale
Reclass of seasoned loan portfolios to held-for-sale, net	(317,304,000)	0	0
Mid- Atlantic liabilities reclassified to held for sale	$ 630,065,000	$ 0	$ 0

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Consolidation The Consolidated Financial Statements (the “financial statements”) of Berkshire Hills Bancorp, Inc. and its subsidiaries (the “Company” or “Berkshire”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The Company is a Delaware corporation, headquartered in Boston, Massachusetts, and the holding company for Berkshire Bank (the “Bank”), a Massachusetts-chartered trust company headquartered in Pittsfield, Massachusetts, and Berkshire Insurance Group, Inc. These financial statements include the accounts of the Company, its wholly-owned subsidiaries and the Bank’s consolidated subsidiaries. In consolidation, all significant intercompany accounts and transactions are eliminated. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly-owned and majority-owned subsidiaries are consolidated unless GAAP requires otherwise. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date these financial statements were issued. Reclassifications Certain items in prior financial statements have been reclassified to conform to the current presentation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements. Actual results could differ from those estimates. Refer to Note 17 – Other Commitments, Contingencies, and Off-Balance Sheet Activities for pandemic related risks and uncertainties. Business Combinations Business combinations are accounted for using the acquisition method of accounting. Under this method, the accounts of an acquired entity are included with the acquirer’s accounts as of the date of acquisition with any excess of purchase price over the fair value of the net assets acquired (including identifiable intangibles) capitalized as goodwill. To consummate an acquisition, the Company will typically issue common stock and/or pay cash, depending on the terms of the acquisition agreement. The value of common shares issued is determined based upon the market price of the stock as of the closing of the acquisition. Cash and Cash equivalents Cash and cash equivalents include cash, balances due from banks, and short-term investments, all of which had an original maturity within 90 days. Due to the nature of cash and cash equivalents and the near term maturity, the Company estimated that the carrying amount of such instruments approximated fair value. The nature of the Bank’s business requires that it maintain amounts due from banks which at times, may exceed federally insured limits. The Bank has not experienced any losses on such amounts and all amounts are maintained with well-capitalized institutions. Trading Security The Company accounts for a tax advantaged economic development bond originated in 2008 at fair value, in accordance with Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) 320. The bond has been designated as a trading account security and is recorded at fair value, with changes in unrealized gains and losses recorded through earnings each period as part of non-interest income. Securities Debt securities that management has the intent and ability to hold to maturity are classified as held to maturity and carried at amortized cost. All other debt securities are classified as available for sale and carried at fair value, with unrealized gains and losses reported as a component of other net comprehensive income. Equity securities are carried at fair value, with changes in fair value reported in net income. Management determines the appropriate classification of securities at the time of purchase. Restricted equity securities, such as stock in the Federal Home Loan Bank of Boston (“FHLBB”) are carried at cost. There are no quoted market prices for the Company’s restricted equity securities. The Bank is a member of the FHLBB, which requires that members maintain an investment in FHLBB stock, which may be redeemed based on certain conditions. The Bank reviews for impairment based on the ultimate recoverability of the cost bases in the FHLBB stock. Purchase premiums and discounts are recognized in interest income using the interest method, without anticipating prepayments, except mortgage-backed securities where prepayments are anticipated, over the terms of the securities. Premiums on callable debt securities are amortized to their earliest call date. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. The Company measures expected credit losses on held to maturity debt securities on a collective basis. Accrued interest receivable on held to maturity debt securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. The Company evaluates available for sale debt securities in an unrealized loss position by first assessing whether it intends to sell or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For available for sale debt securities that do not meet the aforementioned criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, the Company considers the extent to which fair value is less than amortized cost, any changes to the rating of security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income. Loans Held for Sale Loans originated with the intent to be sold in the secondary market are accounted for under the fair value option. Non-refundable fees and direct loan origination costs related to residential mortgage loans held for sale are recognized in non-interest income or non-interest expense as earned or incurred. Fair value is primarily determined based on quoted prices for similar loans in active markets. Gains and losses on sales of residential mortgage loans (sales proceeds minus carrying value) are recorded in non-interest income. Loans that were previously held for investment that the Company has an active plan to sell are transferred to loans held for sale at the lower of cost or market (fair value). The market price is primarily determined based on quoted prices for similar loans in active markets or agreed upon sales prices. Gains are recorded in non-interest income at sale to the extent that the sale price of the loan exceeds carrying value. Any reduction in the loan’s value, prior to being transferred to loans held for sale, is reflected as a charge-off of the recorded investment in the loan resulting in a new cost basis, with a corresponding reduction in the allowance for loan losses. Further decreases in the fair value of the loan are recognized in non-interest expense. Loans Loans are reported at their amortized cost. Amortized cost is the principal balance outstanding, net of the unamortized balance of any deferred fees or costs and the unamortized balance of any premiums or discounts on loans purchased or acquired through mergers. Interest income is accrued on the unpaid principal balance. Interest income includes net accretion or amortization of deferred fees or costs and of premiums or discounts. Direct loan origination costs, net of any origination fees, in addition to premiums and discounts on loans, are deferred and recognized as an adjustment of the related loan yield using the interest method. Interest on loans, excluding automobile loans, is generally not accrued on loans which are ninety days or more past due unless the loan is well-secured and in the process of collection. Past due status is based on contractual terms of the loan. Automobile loans generally continue accruing until one hundred and twenty days delinquent, at which time they are charged off. All interest accrued but not collected for loans that are placed on non-accrual or charged-off is reversed against interest income, except for certain loans designated as well-secured. The interest on non-accrual loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Purchase Credit Deteriorated (PCD) Loans Loans that the Company acquired in acquisitions include some loans that have experienced more than insignificant credit deterioration since origination. PCD loans are recorded at the amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision expense. Allowance for Credit Losses for Loans The allowance for credit losses for loans (“ACLL”) is comprised of the allowance for loan losses and the allowance for unfunded commitments which is accounted for as a separate liability in other liabilities on the consolidated balance sheet. The ACLL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Accrued interest receivable is excluded from the estimate of credit losses. The level of the ACLL represents management’s estimate of expected credit losses over the expected life of the loans at the balance sheet date. The Company uses a static pool migration analysis method, applying expected historical loss trend and observed economic metrics. The level of the ACLL is based on management’s ongoing review of all relevant information, from internal and external sources, relating to past and current events, utilizing a 7 quarter reasonable and supportable forecast period with a 1 year reversion period. The ACLL reserve is overlaid with qualitative factors based upon: • the existence and growth of concentrations of credit; • the volume and severity of past due financial assets, including nonaccrual assets; • the institutions lending and credit review as well as the experience and ability of relevant management and staff and; • the effect of other external factors such as regulatory, competition, regional market conditions, legal and technological environment and other events such as natural disasters; • the effect of other economic factors such as economic stimulus and customer forbearance programs. The allowance for unfunded commitments is maintained at a level by the Company to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). The ACLL is measured on a collective (pool) basis when similar risk characteristics exist. The Company evaluates its risk characteristics of loans based on regulatory call report code with sub-segmentation based on underlying collateral for certain loan types. Risk characteristics relevant to each portfolio segment are as follows: Construction – Loans in this segment primarily include real estate development loans for which payment is derived from sale of the property or long term financing at completion. Credit risk is affected by cost overruns, time to sell at an adequate price, and market conditions. Commercial real estate multifamily, owner occupied and non-owner – Loans in this segment are primarily owner-occupied or income-producing properties throughout New England and Northeastern New York. The underlying cash flows generated by the properties are adversely impacted by a downturn in the economy, which in turn, will have an effect on the credit quality in this segment. Management monitors the cash flows of these loans. Commercial and industrial loans – Loans in this segment are made to businesses and are generally secured by assets of the business such as accounts receivable, inventory, marketable securities, other liquid collateral, equipment and other business assets. Repayment is expected from the cash flows of the business. Loans in this segment include asset based loans which generally have no scheduled repayment which are closely monitored against formula based collateral advance ratios. A weakened economy, and resultant decreased consumer spending, will have an effect on the credit quality of this segment. Residential real estate – All loans in this segment are collateralized by residential real estate and repayment is dependent on the credit quality of the individual borrower. The overall health of the economy, including unemployment rates and housing prices, will have an effect on the credit quality in this segment. Home equity and other consumer loans – Loans in this segment are primarily home equity lines of credit, automobile loans and other consumer loans. The overall health of the economy, including unemployment rates and housing prices, will have an effect on the credit quality in this segment. Loans that do not share risk characteristics are evaluated on an individual basis, which the Company has determined to be non-accrual loans over a threshold, loans that were determined to be Troubled Debt Restructurings (“TDRs”) and PCD loans. Loans evaluated individually are not also included in the collective evaluation. Estimates of specific allowance may be determined by the present value of anticipated future cash flows or the loan’s observable fair market value, or the fair value of the collateral less costs to sell, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the amortized cost in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible. Bank-Owned Life Insurance Bank-owned life insurance policies are reflected on the Consolidated Balance Sheets at the amount that can be realized under the insurance contract at the balance sheet date which is the cash surrender value. Changes in the net cash surrender value of the policies, as well as insurance proceeds received, are reflected in non-interest income on the Consolidated Statements of Operations and are not subject to income taxes. Foreclosed and Repossessed Assets Other real estate owned is comprised of real estate acquired through foreclosure proceedings or acceptance of a deed in lieu of foreclosure. Repossessed collateral is primarily comprised of taxi medallions. Both other real estate owned and repossessed collateral are held for sale and are initially recorded at the fair value less estimated costs to sell at the date of foreclosure or repossession, establishing a new cost basis. The shortfall, if any, of the loan balance over the fair value of the property or collateral (excluding taxi medallions), less cost to sell, at the time of transfer from loans to other real estate owned or repossessed collateral is charged to the allowance for loan losses. Subsequent to transfer, the asset is carried at lower of cost or fair value less cost to sell and periodically evaluated for impairment. The shortfall, if any, of the loan balance over the fair value of the collateral comprised of taxi medallions at the time of transfer from loans to repossessed collateral is charged to non-interest income. Subsequent impairments in the fair value of other real estate owned and repossessed collateral are charged to expense in the period incurred. Net operating income or expense related to other real estate owned and repossessed collateral is included in operating expenses in the accompanying Consolidated Statements of Operations. Because of changing market conditions, there are inherent uncertainties in the assumptions with respect to the estimated fair value of other real estate owned and repossessed collateral. Because of these inherent uncertainties, the amount ultimately realized on other real estate owned and repossessed collateral may differ from the amounts reflected in the financial statements. Capitalized Servicing Rights Capitalized servicing rights are included in “other assets” in the Consolidated Balance Sheets. Servicing assets are initially recognized as separate assets at fair value when rights are acquired through purchase or through sale of financial assets with servicing retained. The Company's servicing rights accounted for under the fair value method are carried on the Consolidated Balance Sheets at fair value with changes in fair value recorded in income in the period in which the change occurs. Changes in the fair value of servicing rights are primarily due to changes in valuation assumptions, such as discount rates and prepayment speeds, and the collection and realization of expected cash flows. The Company’s servicing rights accounted for under the amortization method are initially recorded at fair value. Under that method, capitalized servicing rights are charged to expense in proportion to and over the period of estimated net servicing income. Fair value of the servicing rights 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, prepayment speeds and default rates and losses. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranches. If the Company later determines that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the allowance may be recorded as an increase to income. Premises and Equipment Land is carried at cost. Buildings, improvements, and equipment are carried at cost less accumulated depreciation and amortization computed on the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on the straight-line method over the shorter of the lease term, plus optional terms if certain conditions are met, or the estimated useful life of the asset. Goodwill Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Goodwill is assessed annually for impairment, and more frequently if events or changes in circumstances indicate that there may be an impairment. Adverse changes in the economic environment, declining operations, unanticipated competition, loss of key personnel, or other factors could result in a decline in the implied fair value of goodwill. Subsequent reversals of goodwill impairment are prohibited. Other Intangibles Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset or liability. The fair values of these assets are generally determined based on appraisals and are subsequently amortized on a straight-line basis or an accelerated basis over their estimated lives. Management assesses the recoverability of these intangible assets at least annually or whenever events or changes in circumstances indicate that their carrying value may not be recoverable. If the carrying amount exceeds fair value, an impairment charge is recorded to income. Transfers of Financial Assets Transfers of an entire financial asset, group of entire financial assets, or a participating interest in an entire financial asset 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 to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets. Income Taxes Deferred income taxes are recognized for the tax consequences of temporary differences by applying enacted statutory tax rates applicable for future years to differences between financial statement and tax bases of existing assets and liabilities. The effect of tax rate changes on deferred taxes is recognized in the income tax provision in the period that includes the enactment date. A tax valuation allowance is established, as needed, to reduce net deferred tax assets to the amount expected to be realized. In the event it becomes more likely than not that some or all of the deferred tax asset allowances will not be needed, the valuation allowance will be adjusted. In the ordinary course of business there is inherent uncertainty in quantifying the Company’s income tax positions. Income tax positions and recorded tax benefits are based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, we have determined the amount of the tax benefit to be recognized by estimating the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is more-likely-than-not that a tax benefit will not be sustained, no tax benefit has been recognized in the financial statements. Where applicable, associated interest and penalties have also been recognized. We recognize accrued interest and penalties related to unrecognized tax benefits as a component of income tax expense. Insurance Commissions Commission revenue is recognized as of the effective date of the insurance policy or the date the customer is billed, whichever is later, net of return commissions related to policy cancellations. Policy cancellation is a variable consideration that is not deemed significant and thus, does not impact the amount of revenue recognized. In addition, the Company may receive additional performance commissions based on achieving certain sales and loss experience measures. Such commissions are recognized when determinable, which is generally when such commissions are received or when the Company receives data from the insurance companies that allows the reasonable estimation of these amounts. Stock-Based Compensation The Company measures and recognizes compensation cost relating to share-based payment transactions based on the grant-date fair value of the equity instruments issued. The fair value of restricted stock is recorded as unearned compensation. The deferred expense is amortized to compensation expense based on one of several permitted attribution methods over the longer of the required service period or performance period. For performance-based restricted stock awards, the Company estimates the degree to which performance conditions will be met to determine the number of shares that will vest and the related compensation expense. Compensation expense is adjusted in the period such estimates change. Income tax benefits and/or tax deficiencies related to stock compensation determined as the difference between compensation cost recognized for financial reporting purposes and the deduction for tax, are recognized in the income statement as income tax expense or benefit in the period in which they occur. Wealth Management Wealth management assets held in a fiduciary or agent capacity are not included in the accompanying Consolidated Balance Sheets because they are not assets of the Company. Wealth management fees is primarily comprised of fees earned from consultative investment management, trust administration, tax return preparation, and financial planning. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based on the daily accrual of the market value of the investment accounts and the applicable fee rate. Derivative Instruments and Hedging Activities The Company enters into interest rate swap agreements as part of the Company’s interest rate risk management strategy for certain assets and liabilities and not for speculative purposes. Based on the Company’s intended use for the interest rate swap at inception, the Company designates the derivative as either an economic hedge of an asset or liability or a hedging instrument subject to the hedge accounting provisions of ASC 815, “Derivatives and Hedging.” Interest rate swaps designated as economic hedges are recorded at fair value within other assets or liabilities. Changes in the fair value of these derivatives are recorded directly through earnings. For interest rate swaps that management intends to apply the hedge accounting provisions of ASC 815, the Company formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. Additionally, the Company uses dollar offset or regression analysis at the hedge’s inception and for each reporting period thereafter, to assess whether the derivative used in its hedging transaction is expected to be and has been highly effective in offsetting changes in the fair value or cash flows of the hedged item. The Company discontinues hedge accounting when it is determined that a derivative is not expected to be or has ceased to be highly effective as a hedge, and then reflects changes in fair value of the derivative in earnings after termination of the hedge relationship. The Company has characterized its interest rate swaps that qualify under ASC 815 hedge accounting as cash flow hedges. Cash flow hedges are used to minimize the variability in cash flows of assets or liabilities, or forecasted transactions caused by interest rate fluctuations, and are recorded at fair value in other assets or liabilities within the Company’s balance sheets. Changes in the fair value of these cash flow hedges are initially recorded in accumulated other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. Any hedge ineffectiveness assessed as part of the Company’s quarterly analysis is recorded directly to earnings. The Company enters into commitments to lend with borrowers, and forward commitments to sell loans or to-be-announced mortgage-backed bonds to investors to hedge against the inherent interest rate and pricing risk associated with selling loans. The commitments to lend generally terminate once the loan is funded, the lock period expires or the borrower decides not to contract for the loan. The forward commitments generally terminate once the loan is sold, the commitment period expires or the borrower decides not to contract for the loan. These commitments are considered derivatives which are accounted for by recognizing their estimated fair value on the Consolidated Balance Sheets as either a freestanding asset or liability. See Note 15 - Derivative Instruments and Hedging Activities to the financial statements for more information on commitments to lend and forward commitments. Off-Balance Sheet Financial Instruments In the ordinary course of business, the Company enters into off-balance sheet financial instruments, consisting primarily of credit related financial instruments. These financial instruments are recorded in the financial statements when they are funded or related fees are incurred or received. Fair Value Hierarchy The Company groups assets and liabilities that are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. Level 1 - Valuation is based on quoted prices in active markets for identical assets or liabilities. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2 - Valuation is based on observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using unobservable techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Employee Benefits The Company maintains an employer sponsored 401(k) plan to which participants may make contributions in the form of salary deferrals and the Company provides matching contributions in accordance with the terms of the plan. Contributions due under the terms of the defined contribution plans are accrued as earned by employees. Due to the Rome Bancorp acquisition in 2011, the Company inherited a noncontributory, qualified, defined benefit pension plan for certain employees who met age and service requirements; as well as other post-retirement benefits, principally health care and group life insurance. The Rome pension plan and postretirement benefits that were acquired in connection with the whole-bank acquisition were frozen prior to the close of the transaction. The pension benefit in the form of a life annuity is based on the employee’s combined years of service, age, and compensation. The Company also has a long-term care post-retirement benefit plan for certain executives where upon disability, associated benefits are funded by insurance policies or paid directly by the Company. In order to measure the expense associated with the Plans, various assumptions are made including the discount rate, expected return on plan assets, anticipated mortality rates, and expected future healthcare costs. The assumptions are based on historical experience as well as current facts and circumstances. The Company uses a December 31 measurement date for its plans. As of the measurement date, plan assets are determined based on fair value, generally representing observable market prices. The projected benefit obligation is primarily determined based on the present value of projected benefit distributions at an assumed discount rate. Net periodic pension benefit costs include interest costs based on an assumed discount rate, the expected return on plan assets based on actuarially derived market-related values, and the amortization of net actuarial losses. Net periodic postretirement benefit costs include service costs, interest costs based on an assumed discount rate, and the amortization of prior service credits and net actuarial gains. Differences between expected and actual results in each year are included in the net actuarial gain or loss

DISCONTINUED OPERATIONS AND HEL

DISCONTINUED OPERATIONS AND HELD FOR SALE	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS AND HELD FOR SALE	DISCONTINUED OPERATIONS AND HELD FOR SALE During the first quarter of 2019, the Company reached the decision to pursue the sale of the national mortgage banking operations of First Choice Loan Services, Inc. (“FCLS”) – a subsidiary of the Bank. The decision was based on a number of strategic priorities and other factors, including the competitiveness of the mortgage industry. As a result of these actions, the Company classified the operations of FCLS as discontinued under ASC 205-20. The Consolidated Balance Sheets, Consolidated Statements of Operations, and Consolidated Statements of Cash Flows present discontinued operations retrospectively for current and prior periods. On May 7, 2020, the Company completed a transaction to sell certain assets and liabilities related to the operations of FCLS. During the fourth quarter of 2020, the Company completed the final wind-down of the operations of FCLS. Operating results for the year ended December 31, 2020, include expenses related to the wind-down of operations. The following is a summary of the assets and liabilities of the discontinued operations of FCLS at December 31, 2020 and December 31, 2019: (in thousands) December 31, 2020 December 31, 2019 Assets Loans held for sale, at fair value $ — $ 132,655 Premises and equipment, net — 1,073 Mortgage servicing rights, at fair value — 12,299 Mortgage banking derivatives — 2,329 Right-of-use asset — 3,462 Deferred tax — (3,418) Other assets — 5,732 Total assets $ — $ 154,132 Liabilities Customer payments in process $ — $ 15,372 Lease liability — 3,494 Other liabilities — 7,615 Total liabilities $ — $ 26,481 FCLS funded its lending operations and maintained working capital through an intercompany line-of-credit with the Bank. Although the wind-down of FCLS resulted in settlement of these borrowings, debt was not allocated to discontinued operations due to the intercompany nature of the borrowings. The following presents operating results of the discontinued operations of FCLS for the years ended December 31, 2020, 2019, and 2018: Years Ended December 31, (in thousands) 2020 2019 2018 Interest income $ 1,525 $ 6,085 $ 5,267 Interest expense 391 3,372 2,131 Net interest income 1,134 2,713 3,136 Non-interest (loss)/income (4,740) 38,517 35,574 Total net revenue (3,606) 41,230 38,710 Non-interest expense 23,249 46,769 43,477 (Loss) from discontinued operations before income taxes (26,855) (5,539) (4,767) Income tax (benefit) (7,013) (1,468) (1,313) Net (loss) from discontinued operations $ (19,842) $ (4,071) $ (3,454) FCLS also originated mortgages designated as held-for-investment. This component of FCLS’s operations was not considered discontinued, since the Company expects to continue to originate mortgages designated as held-for-investment in its footprint on a small scale through processes considered as continuing operations. Mid-Atlantic Branch Sale The Company has entered into an agreement to sell its eight Mid-Atlantic branches to Investors Bank of Short Hills, New Jersey, subject to customary regulatory approvals. The transfer is targeted for completion in the first half of 2021. The branch sale includes loans with a total balance of $301 million and deposit accounts with a total balance of $617 million as of December 31, 2020. These balances are included in assets held for sale and liabilities held for sale on the Consolidated Balance Sheets. The buyer has agreed to pay a premium equal to 3.0% of the final deposit balance transferred. The sale includes all branch premises and equipment, and the agreement provides that the buyer intends to offer employment to all associated staff. Berkshire expects to complete the net transfer with funds from short-term investments. The branch sale will have no effect on Berkshire’s Mid-Atlantic specialized commercial lending operations, including SBA lending at its 44 Business Capital Division and its asset-based lending relationships. The following is a summary of the assets and liabilities related to the branch sale at December 31, 2020: (in thousands) December 31, 2020 Assets Loans $ 300,599 Other assets 16,705 Total assets $ 317,304 Liabilities Deposits $ 617,377 Other liabilities 12,688 Total liabilities $ 630,065

CASH AND CASH EQUIVALENTS

CASH AND CASH EQUIVALENTS	12 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
CASH AND CASH EQUIVALENTS	CASH AND CASH EQUIVALENTS Cash and cash equivalents include cash on hand, amounts due from banks, and short-term investments with original maturities of 90 days or less. Short-term investments included $75.1 million and $96.3 million pledged as collateral support for derivative financial contracts at year-end 2020 and 2019, respectively. The Federal Reserve Bank requires the Bank to maintain certain reserve requirements of vault cash and/or deposits. As of December 31, 2020, the reserve requirement was zero. The reserve requirement, included in cash and equivalents, as of December 31, 2019 was $18.3 million

TRADING SECURITY

TRADING SECURITY	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
TRADING SECURITY	TRADING SECURITY The Company holds a tax advantaged economic development bond that is being accounted for at fair value. The security had an amortized cost of $8.7 million

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The following is a summary of securities available for sale (“AFS”) , held to maturity (“HTM”), and marketable equity securities: (In thousands) Amortized Gross Gross Fair Value Allowance December 31, 2020 Securities available for sale Debt securities: Municipal bonds and obligations $ 90,273 $ 7,530 $ — $ 97,803 $ — Agency collateralized mortgage obligations 740,225 16,836 (235) 756,826 — Agency mortgage-backed securities 433,311 4,954 (133) 438,132 — Agency commercial mortgage-backed securities 278,990 9,835 (175) 288,650 — Corporate bonds 59,098 942 (10) 60,030 — Other bonds and obligations 52,080 1,719 (8) 53,791 — Total securities available for sale 1,653,977 41,816 (561) 1,695,232 — Securities held to maturity Municipal bonds and obligations 246,520 20,106 — 266,626 64 Agency collateralized mortgage obligations 153,561 5,989 (171) 159,379 — Agency mortgage-backed securities 35,865 198 (29) 36,034 — Agency commercial mortgage-backed securities 25,481 590 (12) 26,059 — Tax advantaged economic development bonds 3,369 93 — 3,462 40 Other bonds and obligations 295 — — 295 — Total securities held to maturity 465,091 26,976 (212) 491,855 104 Marketable equity securities 18,061 767 (315) 18,513 — Total $ 2,137,129 $ 69,559 $ (1,088) $ 2,205,600 $ 104 December 31, 2019 Securities available for sale Debt securities: Municipal bonds and obligations $ 104,325 $ 5,813 $ — $ 110,138 $ — Agency collateralized mortgage obligations 742,550 6,431 (169) 748,812 — Agency mortgage-backed securities 146,589 1,515 (360) 147,744 — Agency commercial mortgage-backed securities 148,066 176 (1,146) 147,096 — Corporate bonds 115,395 1,788 (607) 116,576 — Other bonds and obligations 40,414 780 (5) 41,189 — Total securities available for sale 1,297,339 16,503 (2,287) 1,311,555 — Securities held to maturity Municipal bonds and obligations 252,936 13,095 (5) 266,026 — Agency collateralized mortgage-backed securities 69,667 2,870 (50) 72,487 — Agency mortgage-backed securities 6,271 29 — 6,300 — Agency commercial mortgage-backed securities 10,353 51 — 10,404 — Tax advantaged economic development bonds 18,456 218 (910) 17,764 — Other bonds and obligations 296 — — 296 — Total securities held to maturity 357,979 16,263 (965) 373,277 — Marketable equity securities 37,138 5,147 (729) 41,556 — Total $ 1,692,456 $ 37,913 $ (3,981) $ 1,726,388 $ — At year-end 2020 and 2019, accumulated net unrealized gains/(losses) on AFS securities included in accumulated other comprehensive income/(loss) were $41.3 million and $14.2 million, respectively. At year-end 2020 and 2019, accumulated net unrealized gains on HTM securities included in accumulated other comprehensive income/(loss) were $3.7 million and $5.0 million respectively. The year-end 2020 and 2019 related income tax (liability)/benefit of $(11.5) million and $(5.1) million, respectively, was also included in accumulated other comprehensive income/(loss). The following table summarizes the activity in the allowance for credit losses for debt securities held to maturity by security type for the year ended December 31, 2020: (In thousands) Municipal bonds and obligations Tax advantaged economic development bonds Total Balance at December 31, 2019 $ — $ — $ — Impact of ASC 326 adoption 83 226 309 Provision for credit losses- reversal (19) (186) (205) Balance at December 31, 2020 $ 64 $ 40 $ 104 Credit Quality Information The Company monitors the credit quality of held to maturity securities through credit ratings from various rating agencies. Credit ratings express opinions about the credit quality of a security and are utilized by the Company to make informed decisions. Investment grade securities are rated BBB-/Baa3 or higher and generally considered by the rating agencies and market participants to be of low credit risk. Conversely, securities rated below investment grade are considered to have distinctively higher credit risk than investment grade securities. For securities without credit ratings, the Company utilizes other financial information indicating the financial health of the underlying municipality, agency, or organization. As of December 31, 2020, none of the Company's investment securities were delinquent or in non-accrual status. The amortized cost and estimated fair value of AFS and HTM securities, segregated by contractual maturity at year-end 2020 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Mortgage-backed securities and collateralized mortgage obligations are shown in total, as their maturities are highly variable. Available for sale Held to maturity (In thousands) Amortized Fair Amortized Fair Within 1 year $ 33,248 $ 33,265 $ 1,950 $ 1,952 Over 1 year to 5 years 8,148 8,276 3,216 3,233 Over 5 years to 10 years 67,952 69,619 23,050 24,026 Over 10 years 92,103 100,464 221,968 241,172 Total bonds and obligations 201,451 211,624 250,184 270,383 Mortgage-backed securities 1,452,526 1,483,608 214,907 221,472 Total $ 1,653,977 $ 1,695,232 $ 465,091 $ 491,855 At year-end 2020 and 2019, the Company had pledged securities as collateral for certain municipal deposits and for interest rate swaps with certain counterparties. The total amortized cost and fair values of these pledged securities follows. Additionally, there is a blanket lien on certain securities to collateralize borrowings from the FHLBB, as discussed further in Note 11 - Borrowed Funds. 2020 2019 (In thousands) Amortized Fair Amortized Fair Securities pledged to swap counterparties $ 37,532 $ 37,815 $ 25,728 $ 25,828 Securities pledged for municipal deposits 156,047 166,570 168,740 175,719 Total $ 193,579 $ 204,385 $ 194,468 $ 201,547 Purchases of AFS securities totaled $885 million in 2020 and $120 million in 2019. Proceeds from the sale of AFS securities totaled $69 million in 2020 and $136 million in 2019. The amounts for the sale of AFS securities were reclassified out of accumulated other comprehensive income and into earnings. The components of net recognized gains and losses on the sale of AFS securities and the fair value change of marketable equities are as follows: (In thousands) 2020 2019 2018 Gross recognized gains $ 4,602 $ 7,492 $ 3,256 Gross recognized losses (11,133) (3,103) (6,975) Net recognized gains/(losses) $ (6,531) $ 4,389 $ (3,719) Debt securities with unrealized losses, segregated by the duration of their continuous unrealized loss positions, are summarized as follows: Less Than Twelve Months Over Twelve Months Total (In thousands) Gross Fair Gross Fair Gross Fair December 31, 2020 Securities available for sale Debt securities: Agency collateralized mortgage obligations $ 235 $ 77,898 $ — $ — $ 235 $ 77,898 Agency mortgage-backed securities 131 39,939 2 256 133 40,195 Agency commercial mortgage-back securities 175 51,435 — — 175 51,435 Corporate bonds 10 4,875 — — 10 4,875 Other bonds and obligations — — 8 1,030 8 1,030 Total securities available for sale $ 551 $ 174,147 $ 10 $ 1,286 $ 561 $ 175,433 Securities held to maturity Agency collateralized mortgage obligations 171 25,048 — — 171 25,048 Agency mortgage-backed securities 29 20,710 — — 29 20,710 Agency commercial mortgage-back securities 12 10,216 — — 12 10,216 Total securities held to maturity 212 55,974 — — 212 55,974 Total $ 763 $ 230,121 $ 10 $ 1,286 $ 773 $ 231,407 December 31, 2019 Securities available for sale Debt securities: Agency collateralized mortgage obligations $ 127 $ 52,623 $ 42 $ 6,267 $ 169 $ 58,890 Agency mortgage-backed securities 59 10,640 301 23,404 360 34,044 Agency commercial mortgage-backed securities 1,097 116,324 49 11,250 1,146 127,574 Corporate bonds — — 607 42,823 607 42,823 Other bonds and obligations 4 1,239 1 29 5 1,268 Total securities available for sale $ 1,287 $ 180,826 $ 1,000 $ 83,773 $ 2,287 $ 264,599 Securities held to maturity Municipal bonds and obligations 5 800 — — 5 800 Agency collateralized mortgage obligations 50 9,778 — — 50 9,778 Tax advantaged economic development bonds — — 910 6,925 910 6,925 Total securities held to maturity 55 10,578 910 6,925 965 17,503 Total $ 1,342 $ 191,404 $ 1,910 $ 90,698 $ 3,252 $ 282,102 Debt Securities The Company expects to recover its amortized cost basis on all debt securities in its AFS and HTM portfolios. Furthermore, the Company does not intend to sell nor does it anticipate that it will be required to sell any of its securities in an unrealized loss position as of December 31, 2020, prior to this recovery. The Company’s ability and intent to hold these securities until recovery is supported by the Company’s strong capital and liquidity positions. The following summarizes, by investment security type, the basis for the conclusion that the debt securities in an unrealized loss position within the Company’s AFS and HTM portfolios did not maintain other-than-temporary impairment ("OTTI") at year-end 2020: AFS collateralized mortgage obligations At year-end 2020, 12 out of 225 securities in the Company’s portfolio of AFS collateralized mortgage obligations were in unrealized loss positions. Aggregate unrealized losses represented 0.3% of the amortized cost of securities in unrealized loss positions. The Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), and Government National Mortgage Association ("GNMA") guarantee the contractual cash flows of all of the Company's collateralized residential mortgage obligations. The securities are investment grade rated and there were no material underlying credit downgrades during 2020. All securities are performing. AFS commercial and residential mortgage-backed securities At year-end 2020, 17 out of 125 securities in the Company’s portfolio of AFS mortgage-backed securities were in unrealized loss positions. Aggregate unrealized losses represented 0.3% of the amortized cost of securities in unrealized loss positions. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of the Company’s mortgage-backed securities. The securities are investment grade rated and there were no material underlying credit downgrades during 2020. All securities are performing. AFS corporate bonds At year-end 2020, 1 out of 15 securities in the Company’s portfolio of AFS corporate bonds were in unrealized loss positions. The aggregate unrealized loss represents 0.2% of the amortized cost of bonds in unrealized loss positions. The Company reviews the financial strength of these bonds and has concluded that the amortized cost remains supported by the expected future cash flows of these securities. AFS other bonds and obligations At year-end 2020, 3 out of 7 securities in the Company’s portfolio of other bonds and obligations were in unrealized loss positions. Aggregate unrealized losses represented 0.8% of the amortized cost of securities in unrealized loss positions. The securities are all investment grade rated, and there were no material underlying credit downgrades during 2020. All securities are performing. HTM collateralized mortgage obligations At year-end 2020, 2 out of 13 securities in the Company’s portfolio of HTM collateralized mortgage obligations were in an unrealized loss position. Aggregate unrealized losses represented 0.7% of the amortized cost of the security in an unrealized loss position. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of all of the Company's collateralized residential mortgage obligations. The securities are investment grade rated, and there were no material underlying credit downgrades during 2020. All securities are performing. HTM commercial and residential mortgage-backed securities At year-end 2020, 2 out of 6 securities in the Company’s portfolio of HTM mortgage-backed securities were in unrealized loss positions. Aggregate unrealized losses represented 0.1% of the amortized cost of securities in unrealized loss positions. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of the Company’s mortgage-backed securities. The securities are investment grade rated and there were no material underlying credit downgrades during 2020. All securities are performing.

LOANS AND RELATED ALLOWANCE FOR

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES	90 Days Past Due Total Past Current Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 382,014 $ 382,014 $ — Commercial real estate 423 89 15,623 16,135 2,398,807 2,414,942 — Total 423 89 15,623 16,135 2,780,821 2,796,956 — Commercial and industrial loans Total 2,841 2,033 10,662 15,536 1,427,081 1,442,617 122 Residential mortgages: 1-4 family 1,669 714 3,350 5,733 2,138,084 2,143,817 800 Construction — — — — 4,641 4,641 — Total 1,669 714 3,350 5,733 2,142,725 2,148,458 800 Consumer loans: Home equity 149 — 1,147 1,296 272,571 273,867 52 Auto and other 4,709 990 2,729 8,428 496,171 504,599 1 Total 4,858 990 3,876 9,724 768,742 778,466 53 Total $ 9,791 $ 3,826 $ 33,511 $ 47,128 $ 7,119,369 $ 7,166,497 $ 975 Acquired Loans (in thousands) 30-59 Days 60-89 Days >90 Days Past Due Total Past Acquired Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 1,396 $ 47,792 $ — Commercial real estate 3,907 245 10,247 14,399 21,639 1,189,521 5,751 Total 3,907 245 10,247 14,399 23,035 1,237,313 5,751 Commercial and industrial loans Total 888 299 1,275 2,462 26,718 397,891 442 Residential mortgages: 1-4 family 745 491 932 2,168 10,840 533,536 139 Construction — — — — — 3,478 — Total 745 491 932 2,168 10,840 537,014 139 Consumer loans: Home equity 346 222 789 1,357 540 106,724 72 Auto and other 120 22 265 407 286 56,989 — Total 466 244 1,054 1,764 826 163,713 72 Total $ 6,006 $ 1,279 $ 13,508 $ 20,793 $ 61,419 $ 2,335,931 $ 6,404 The following is summary information pertaining to non-accrual loans at December 31, 2019: December 31, 2019 (In thousands) Business Activities Acquired Loans Total Commercial real estate: Construction $ — $ — $ — Other commercial real estate 15,623 4,496 20,119 Total 15,623 4,496 20,119 Commercial and industrial loans: Total 10,540 833 11,373 Residential mortgages: 1-4 family 2,550 793 3,343 Construction — — — Total 2,550 793 3,343 Consumer loans: Home equity 1,095 717 1,812 Auto and other 2,728 265 2,993 Total 3,823 982 4,805 Total non-accrual loans $ 32,536 $ 7,104 $ 39,640 Loans evaluated for impairment as of December 31, 2019 were as follows: Business Activities Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 19,192 $ 9,167 $ 3,019 $ 630 $ 32,008 Collectively evaluated 2,777,764 1,433,450 2,145,439 777,836 7,134,489 Total $ 2,796,956 $ 1,442,617 $ 2,148,458 $ 778,466 $ 7,166,497 Acquired Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 4,241 $ 464 $ 372 $ 575 $ 5,652 Purchased credit-impaired loans 23,035 26,718 10,840 826 61,419 Collectively evaluated 1,210,037 370,709 525,802 162,312 2,268,860 Total $ 1,237,313 $ 397,891 $ 537,014 $ 163,713 $ 2,335,931 The following is a summary of impaired loans at December 31, 2019: Business Activities Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 18,676 $ 37,493 $ — Commercial and industrial loans 4,805 10,104 — Residential mortgages - 1-4 family 433 699 — Consumer - home equity 32 238 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 550 $ 1,411 $ 20 Commercial and industrial loans 4,166 12,136 122 Residential mortgages - 1-4 family 2,615 2,924 109 Consumer - home equity 594 614 42 Consumer - other 8 8 1 Total Commercial real estate $ 19,226 $ 38,904 $ 20 Commercial and industrial loans 8,971 22,240 122 Residential mortgages 3,048 3,623 109 Consumer 634 860 43 Total impaired loans $ 31,879 $ 65,627 $ 294 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet. (2) The Unpaid Principal Balance represents the customer's legal obligation to the Company. Acquired Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 3,200 $ 6,021 $ — Other commercial and industrial loans 437 532 — Residential mortgages - 1-4 family 292 293 — Consumer - home equity 416 844 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 1,033 $ 1,050 $ 97 Commercial and industrial loans 28 30 1 Residential mortgages - 1-4 family 84 110 8 Consumer - home equity 121 123 6 Consumer - other 39 37 6 Total Commercial real estate $ 4,233 $ 7,071 $ 97 Commercial and industrial loans 465 562 1 Residential mortgages 376 403 8 Consumer 576 1,004 12 Total impaired loans $ 5,650 $ 9,040 $ 118 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet. (2) The Unpaid Principal Balance represents the customer's legal obligation to the Company. The following is a summary of the average recorded investment and interest income recognized on impaired loans as of December 31, 2019 and 2018: Business Activities Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 19,805 $ 586 $ 24,078 $ 373 Other commercial and industrial 3,165 523 914 245 Residential mortgages - 1-4 family 185 17 428 20 Consumer-home equity 148 3 107 10 Consumer-other — — — — With an allowance recorded: Other commercial real estate $ 374 $ 107 $ 555 $ 30 Other commercial and industrial 2,533 793 1,259 139 Residential mortgages - 1-4 family 2,427 150 1,407 75 Consumer-home equity 349 32 98 6 Consumer - other 11 1 15 1 Total Commercial real estate $ 20,179 $ 693 $ 24,633 $ 403 Commercial and industrial 5,698 1,316 2,173 384 Residential mortgages 2,612 167 1,835 95 Consumer loans 508 36 220 17 Total impaired loans $ 28,997 $ 2,212 $ 28,861 $ 899 Acquired Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 1,603 $ 117 $ 3,280 $ 263 Other commercial and industrial 441 51 428 68 Residential mortgages - 1-4 family 241 11 290 9 Consumer - home equity 475 23 635 4 Consumer - other — — 13 1 With an allowance recorded: Other commercial real estate $ 1,005 $ 59 $ 950 $ 53 Other commercial and industrial 29 2 197 41 Residential mortgages - 1-4 family 88 7 26 9 Consumer - home equity 68 6 89 12 Consumer - other 41 2 11 3 Total Commercial real estate $ 2,608 $ 176 $ 4,230 $ 316 Commercial and industrial 470 53 625 109 Residential mortgages 329 18 316 18 Consumer loans 584 31 748 20 Total impaired loans $ 3,991 $ 278 $ 5,919 $ 463 No additional funds are committed to be advanced in connection with impaired loans. The following table presents the Company’s TDR activity in 2019 and 2018: (In thousands) 2019 2018 Balance at beginning of year $ 27,415 $ 41,990 Principal payments (6,086) (8,547) TDR status change (1) — — Other reductions (2) (4,076) (8,713) Newly identified TDRs 2,063 2,685 Balance at end of year $ 19,316 $ 27,415 _____________________ (1) TDR status change classification represents TDR loans with a specified interest rate equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk and the loan was on current payment status and not impaired based on the terms specified by the restructuring agreement. (2) Other reductions classification consists of transfer to other real estate owned, charge-offs to loans, and other loan sale payoffs. Allowance for Loan Losses Prior to the adoption of ASC 326 on January 1, 2020, the Company calculated allowance for loan losses using incurred losses methodology. The following tables are disclosures related to the allowance for loan losses in prior periods. Activity in the allowance for loan losses for 2019 and 2018 was as follows: Business Activities Loans Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Charged-off loans 6,577 23,799 635 3,322 34,333 Recoveries on charged-off loans 570 1,012 57 253 1,892 Provision/(releases) for loan losses 9,033 25,404 (1,417) 458 33,478 Balance at end of period $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Individually evaluated for impairment 20 122 109 43 294 Collectively evaluated 24,738 18,999 8,431 4,714 56,882 Total $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Business Activities Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 16,843 $ 13,850 $ 9,420 $ 5,807 $ 45,920 Charged-off loans 5,859 4,275 157 3,187 13,478 Recoveries on charged-off loans 50 620 114 363 1,147 Provision/(releases) for loan losses 10,698 6,309 1,158 4,385 22,550 Balance at end of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Individually evaluated for impairment 9 49 128 11 197 Collectively evaluated 21,723 16,455 10,407 7,357 55,942 Total $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Charged-off loans 830 571 263 557 2,221 Recoveries on charged-off loans 672 438 116 123 1,349 Provision/(releases) for loan losses 1,111 126 365 339 1,941 Balance at end of period $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Individually evaluated for impairment 97 1 8 12 118 Collectively evaluated 4,009 1,056 840 376 6,281 Total $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,856 $ 1,125 $ 598 $ 335 $ 5,914 Charged-off loans 1,812 524 1,091 1,106 4,533 Recoveries on charged-off loans 294 286 51 417 1,048 Provision/(releases) for loan losses 815 177 1,072 837 2,901 Balance at end of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Individually evaluated for impairment 9 4 36 48 97 Collectively evaluated 3,144 1,060 594 435 5,233 Total $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 The following tables present the Company’s loans by risk rating at December 31, 2019: Business Activities Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 382,014 $ 2,354,375 $ 2,736,389 Special mention — 12,167 12,167 Substandard — 48,400 48,400 Total $ 382,014 $ 2,414,942 $ 2,796,956 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 1,366,342 Special mention 50,072 Substandard 24,112 Doubtful 2,091 Total $ 1,442,617 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 2,139,753 $ 4,641 $ 2,144,394 Special mention 714 — 714 Substandard 3,350 — 3,350 Total $ 2,143,817 $ 4,641 $ 2,148,458 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 272,772 $ 501,871 $ 774,643 Nonperforming 1,095 2,728 3,823 Total $ 273,867 $ 504,599 $ 778,466 Acquired Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 46,396 $ 1,130,333 $ 1,176,729 Special mention — 5,993 5,993 Substandard 1,396 53,195 54,591 Total $ 47,792 $ 1,189,521 $ 1,237,313 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 373,744 Special mention 4,404 Substandard 19,743 Total $ 397,891 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 528,282 $ 3,478 $ 531,760 Special mention 592 — 592 Substandard 4,662 — 4,662 Total $ 533,536 $ 3,478 $ 537,014 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 106,007 $ 56,724 $ 162,731 Nonperforming 717 265 982 Total $ 106,724 $ 56,989 $ 163,713 The following table summarizes information about total loans rated Special Mention or lower at December 31, 2019. The table below includes consumer loans that are Special Mention and Substandard accruing that are classified in the above table as performing based on payment activity. December 31, 2019 (In thousands) Business Acquired Loans Total Non-Accrual $ 32,536 $ 7,104 $ 39,640 Substandard Accruing 49,293 73,131 122,424 Total Classified 81,829 80,235 162,064 Special Mention 63,943 11,341 75,284 Total Criticized $ 145,772 $ 91,576 $ 237,348 " id="sjs-B4" xml:space="preserve">LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Upon adoption of ASC 326, the Company evaluates its risk characteristics of loans based on regulatory call report code with sub-segmentation based on underlying collateral for certain loan types. Prior to the adoption of ASC 326, under the incurred loss model, the Company evaluated its risk characteristics of loans based on purpose of the loans. The composition of loans by portfolio segment as of December 31, 2020 and January 1, 2021 follows: (In thousands) December 31, 2019 Statement Balance Impact of ASC 326 Adoption January 1, 2020 Post-ASC 326 Adoption Loans: Construction $ 448,452 $ 187 $ 448,639 Commercial multifamily 631,740 252 631,992 Commercial real estate owner occupied 673,308 3,185 676,493 Commercial real estate non-owner occupied 2,189,780 6,540 2,196,320 Commercial and industrial 1,843,683 (12,212) 1,831,471 Residential real estate 2,853,385 1,868 2,855,253 Home equity 378,793 10 378,803 Consumer other 483,287 205 483,492 Total $ 9,502,428 $ 35 $ 9,502,463 Allowance: Construction $ 2,713 $ (342) $ 2,371 Commercial multifamily 4,413 (1,842) 2,571 Commercial real estate owner occupied 4,880 6,062 10,942 Commercial real estate non-owner occupied 16,344 11,201 27,545 Commercial and industrial 20,099 (2,189) 17,910 Residential real estate 9,970 6,799 16,769 Home equity 1,470 4,884 6,354 Consumer other 3,686 861 4,547 Total $ 63,575 $ 25,434 $ 89,009 The following is a summary of total loans by regulatory call report code with sub-segmentation based on underlying collateral for certain loan types: (In thousands) December 31, 2020 December 31, 2019 Construction $ 454,513 $ 448,452 Commercial multifamily 483,350 631,740 Commercial real estate owner occupied 552,413 673,308 Commercial real estate non-owner occupied 2,119,263 2,189,780 Commercial and industrial 1,943,164 1,843,683 Residential real estate 1,931,681 2,853,385 Home equity 293,981 378,793 Consumer other 303,154 483,287 Total loans $ 8,081,519 $ 9,502,428 Allowance for credit losses 127,302 63,575 Net loans $ 7,954,217 $ 9,438,853 As of December 31, 2020, loans originated under the Small Business Administration ("SBA") Paycheck Protection Program ("PPP") totaled $633.3 million. These loans are 100% guaranteed by the SBA and the full principal amount of the loan may qualify for forgiveness. These loans are included in commercial and industrial. In 2020, the Company purchased loans aggregating $98 million and sold loans aggregating $415 million. In 2019, the Company purchased loans aggregating $432 million and sold loans aggregating $310 million. Net gains on sales of loans were $10.6 million, $12.0 million, and $9.3 million for the years 2020, 2019, and 2018, respectively. These amounts are included in Loan Related Income on the Consolidated Statements of Operations. Most of the Company’s lending activity occurs within its primary markets in Massachusetts, Southern Vermont, and Northeastern New York. Most of the loan portfolio is secured by real estate, including residential mortgages, commercial mortgages, and home equity loans. Year-end loans to operators of non-residential buildings totaled $1.5 billion, or 19.0%, and $1.7 billion, or 18.1% of total loans in 2020 and 2019, respectively. There were no other concentrations of loans related to any single industry in excess of 10% of total loans at year-end 2020 or 2019. As of December 31, 2020, the Company maintained foreclosed residential real estate property with a fair value of $149 thousand. As of December 31, 2019, the Company maintained no foreclosed residential real estate property. Additionally, residential mortgage loans collateralized by real estate property that are in the process of foreclosure as of December 31, 2020 and December 31, 2019 totaled $3.3 million and $6.5 million, respectively, including sold loans serviced by the Company. At year-end 2020, the Company had pledged loans totaling $925 million to the Federal Reserve Bank of Boston as collateral for certain borrowing arrangements. Also, residential first mortgage loans are subject to a blanket lien for FHLBB advances. See Note 11 - Borrowed Funds. At year-end 2020 and 2019, the Company’s commitments outstanding to related parties totaled $2.0 million and $1.8 million, respectively, and the loans outstanding against these commitments totaled $1.1 million and $1.0 million, respectively. Related parties include directors and executive officers of the Company and its subsidiaries, as well as their respective affiliates in which they have a controlling interest and immediate family members. For the years 2020 and 2019, all related party loans were performing. Allowance for Credit Losses for Loans The Company’s activity in the allowance for credit losses for loans for the year ended December 31, 2020 was as follows: (In thousands) Balance at Beginning of Period Impact of Adopting ASC 326 Sub-total Charge-offs Recoveries Provision for Credit Losses Balance at End of Period Year ended December 31, 2020 Construction $ 2,713 $ (342) $ 2,371 $ (834) $ — $ 3,574 $ 5,111 Commercial multifamily 4,413 (1,842) 2,571 (100) 100 3,345 5,916 Commercial real estate owner occupied 4,880 6,062 10,942 (8,686) 1,053 9,071 12,380 Commercial real estate non-owner occupied 16,344 11,201 27,545 (11,653) 307 19,651 35,850 Commercial and industrial 20,099 (2,189) 17,910 (19,328) 4,285 22,146 25,013 Residential real estate 9,970 6,799 16,769 (2,285) 1,359 12,648 28,491 Home equity 1,470 4,884 6,354 (347) 292 183 6,482 Consumer other 3,686 861 4,547 (2,562) 609 5,465 8,059 Total allowance for credit losses $ 63,575 $ 25,434 $ 89,009 $ (45,795) $ 8,005 $ 76,083 $ 127,302 The Company’s allowance for credit losses on unfunded commitments is recognized as a liability (other liability on consolidated balance sheet), with adjustments to the reserve recognized in other noninterest expense in the Consolidated Statements of Operations. The Company’s activity in the allowance for credit losses on unfunded commitments for the year ended December 31, 2020 was as follows: (In thousands) Total Balance at December 31, 2019 $ 100 Impact of adopting ASC 326 7,993 Sub-Total 8,093 Release of expense for credit losses (464) Balance at December 31, 2020 $ 7,629 Credit Quality Information The Company monitors the credit quality of its portfolio by using internal risk ratings that are based on regulatory guidance. Loans that are given a Pass rating are not considered a problem credit. Loans that are classified as Special Mention loans are considered to have potential weaknesses and are evaluated closely by management. Substandard, including non-accruing loans, are loans for which a definitive weakness has been identified and which may make full collection of contractual cash flows questionable. Doubtful loans are those with identified weaknesses that make full collection of contractual cash flows, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. For commercial credits, the Company assigns an internal risk rating at origination and reviews the rating annually, semiannually, or quarterly depending on the risk rating. The rating is also reassessed at any point in time when management becomes aware of information that may affect the borrower’s ability to fulfill their obligations. The Company risk rates its residential mortgages, including 1-4 family and residential construction loans, based on a three rating system: Pass, Special Mention, and Substandard. Loans that are current within 59 days are rated Pass. Residential mortgages that are 60-89 days delinquent are rated Special Mention. Loans delinquent for 90 days or greater are rated Substandard and generally placed on non-accrual status. The following table presents the Company’s loans by risk category: Term Loans Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total As of December 31, 2020 Construction Risk rating Pass $ 38,374 $ 255,377 $ 114,690 $ 28,474 $ 9,519 $ 2,766 $ 1,000 $ — $ 450,200 Special Mention — — 313 — — — — — 313 Substandard — — — 4,000 — — — — 4,000 Total $ 38,374 $ 255,377 $ 115,003 $ 32,474 $ 9,519 $ 2,766 $ 1,000 $ — $ 454,513 Commercial multifamily: Risk rating Pass $ 31,438 $ 57,659 $ 74,932 $ 77,746 $ 81,066 $ 153,818 $ 20 $ — $ 476,679 Special Mention — — — — — — — — — Substandard — — — — 47 6,479 145 — 6,671 Total $ 31,438 $ 57,659 $ 74,932 $ 77,746 $ 81,113 $ 160,297 $ 165 $ — $ 483,350 Commercial real estate owner occupied: Risk rating Pass $ 58,327 $ 84,839 $ 104,797 $ 64,693 $ 44,300 $ 169,197 $ 1,194 $ — $ 527,347 Special Mention 535 2,569 1,136 1,009 800 2,579 — — 8,628 Substandard — 1,266 3,597 1,685 1,439 8,451 — — 16,438 Total $ 58,862 $ 88,674 $ 109,530 $ 67,387 $ 46,539 $ 180,227 $ 1,194 $ — $ 552,413 Commercial real estate non-owner occupied: Risk rating Pass $ 180,520 $ 292,386 $ 435,440 $ 223,935 $ 303,221 $ 497,066 $ 15,393 $ — $ 1,947,961 Special Mention — 279 2,068 6,958 11,798 44,961 1,068 — 67,132 Substandard 7,804 3,529 4,235 19,632 2,124 66,651 195 — 104,170 Total $ 188,324 $ 296,194 $ 441,743 $ 250,525 $ 317,143 $ 608,678 $ 16,656 $ — $ 2,119,263 Commercial and industrial: Risk rating Pass $ 754,260 $ 159,046 $ 205,651 $ 130,985 $ 48,326 $ 148,222 $ 368,769 $ — $ 1,815,259 Special Mention 1,467 5,753 5,267 2,851 1,601 65 12,408 — 29,412 Substandard 7,392 39,822 24,951 7,765 3,504 5,630 9,099 — 98,163 Doubtful — — — — — — 330 — 330 Total $ 763,119 $ 204,621 $ 235,869 $ 141,601 $ 53,431 $ 153,917 $ 390,606 $ — $ 1,943,164 Residential real estate Risk rating Pass $ 150,583 $ 146,142 $ 272,399 $ 320,384 $ 333,159 $ 691,078 $ 3,281 $ — $ 1,917,026 Special Mention 384 — 454 1,430 — 362 — — 2,630 Substandard 991 39 703 902 417 8,964 9 — 12,025 Total $ 151,958 $ 146,181 $ 273,556 $ 322,716 $ 333,576 $ 700,404 $ 3,290 $ — $ 1,931,681 For home equity and consumer other loan portfolio segments, Berkshire evaluates credit quality based on the aging status of the loan and by payment activity. The performing or nonperforming status is updated on an ongoing basis dependent upon improvement and deterioration in credit quality. The following table presents the amortized cost based on payment activity: Term Loans Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total As of December 31, 2020 Home equity: Payment performance Performing $ 2,445 $ 1,960 $ 316 $ 1,859 $ 499 $ 1,882 $ 282,123 $ — $ 291,084 Nonperforming — — 1 — — — 2,896 — 2,897 Total $ 2,445 $ 1,960 $ 317 $ 1,859 $ 499 $ 1,882 $ 285,019 $ — $ 293,981 Consumer other: Payment performance Performing $ 15,193 $ 35,317 $ 101,730 $ 69,366 $ 35,421 $ 31,327 $ 9,339 $ — $ 297,693 Nonperforming 39 316 1,511 1,599 1,585 407 4 — 5,461 Total $ 15,232 $ 35,633 $ 103,241 $ 70,965 $ 37,006 $ 31,734 $ 9,343 $ — $ 303,154 The following is a summary of loans by past due status at December 31, 2020: (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Current Total Loans December 31, 2020 Construction $ — $ — $ — $ — $ 454,513 $ 454,513 Commercial multifamily — — 757 757 482,593 483,350 Commercial real estate owner occupied 809 631 4,894 6,334 546,079 552,413 Commercial real estate non-owner occupied 315 168 38,389 38,872 2,080,391 2,119,263 Commercial and industrial 3,016 3,259 12,982 19,257 1,923,907 1,943,164 Residential real estate 2,068 2,630 11,115 15,813 1,915,868 1,931,681 Home equity 244 284 2,897 3,425 290,556 293,981 Consumer other 2,109 777 5,364 8,250 294,904 303,154 Total $ 8,561 $ 7,749 $ 76,398 $ 92,708 $ 7,988,811 $ 8,081,519 The following is a summary of loans on nonaccrual status and loans past due 90 days or more and still accruing as of December 31, 2020: January 1, 2020 December 31, 2020 (In thousands) Nonaccrual Amortized Cost Nonaccrual Amortized Cost Nonaccrual With No Related Allowance Past Due 90 Days or Greater and Accruing Interest Income Recognized on Nonaccrual Construction $ — $ — $ — $ — $ — Commercial multifamily 811 757 591 — — Commercial real estate owner occupied 15,389 4,509 2,290 385 — Commercial real estate non-owner occupied 1,031 29,572 13,912 8,817 — Commercial and industrial 11,218 12,441 4,725 541 — Residential real estate 6,411 9,711 5,739 1,404 — Home equity 1,798 2,654 159 243 — Consumer other 2,982 5,304 2 60 — Total $ 39,640 $ 64,948 $ 27,418 $ 11,450 $ — The commercial and industrial loans nonaccrual amortized cost as of December 31, 2020 included medallion loans with a fair value of $2.3 million and a contractual balance of $53.9 million. The following table summarizes information about total loans rated Special Mention or lower at December 31, 2020. The table below includes consumer loans that are Special Mention and Substandard accruing that are classified as performing based on payment activity. (In thousands) December 31, 2020 Non-Accrual $ 64,948 Substandard Accruing 185,207 Total Classified 250,155 Special Mention 109,299 Total Criticized $ 359,454 A financial asset is considered collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Expected credit losses for collateral-dependent loans are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. Significant quarter over quarter changes are reflective of changes in nonaccrual status and not necessarily associated with credit quality indicators like appraisal value. The following table presents the amortized cost basis of individually analyzed collateral-dependent loans by loan portfolio segment: Type of Collateral (In thousands) Real Estate Investment Securities/Cash Other December 31, 2020 Commercial multifamily $ 591 $ — $ — Commercial real estate owner occupied 5,714 — — Commercial real estate non-owner occupied 30,950 — — Commercial and industrial 973 36 3,758 Residential real estate 5,081 — — Home equity 145 — — Consumer other 51 — — Total loans $ 43,505 $ 36 $ 3,758 Troubled Debt Restructuring Loans The Company’s loan portfolio also includes certain loans that have been modified in a Troubled Debt Restructuring ("TDR"), where economic concessions have been granted to borrowers who have experienced or are expected to experience financial difficulties. These concessions typically result from the Company’s loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance, or other actions. Certain TDRs are classified as nonperforming at the time of restructure and may only be returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period, generally six months. TDRs are evaluated individually for impairment and may result in a specific allowance amount allocated to an individual loan. The following table presents activity in TDRs for the year ended December 31, 2020: (In thousands) Balance at Beginning of Period Principal Payments TDR Status Change Other Additions/(Reductions) Newly Identified TDRs Balance at End of Period Year ended December 31, 2020 Commercial multifamily $ 793 $ (39) $ — $ — $ — $ 754 Commercial real estate owner occupied 13,331 (5,734) — (5,884) 18 1,731 Commercial real estate non-owner occupied 1,373 (1) — 1,719 10,593 13,684 Commercial and industrial 1,449 (289) — (60) 1,586 2,686 Residential real estate 2,045 (160) — (361) — 1,524 Home equity 277 (22) — (122) — 133 Consumer other 48 (12) — — — 36 Total $ 19,316 $ (6,257) $ — $ (4,708) $ 12,197 $ 20,548 The following table presents loans modified as TDRs that occurred during the years ended December 31, 2020, 2019, and 2018: (dollars in thousands) Total Year ended December 31, 2020 TDR: Number of loans 16 Pre-modification outstanding recorded investment $ 12,197 Post-modification outstanding recorded investment $ 12,197 Year ended December 31, 2019 TDR: Number of loans 13 Pre-modification outstanding recorded investment $ 2,063 Post-modification outstanding recorded investment $ 2,063 Year ended December 31, 2018 TDR: Number of loans 10 Pre-modification outstanding recorded investment $ 2,685 Post-modification outstanding recorded investment $ 2,685 The following table discloses the modifications for TDRs where a concession has been made within the previous 12 months, that then defaulted in the respective reporting period. There were no TDRs for which there was a payment default within twelve months following the modification during the year ended December 31, 2020. For the year ended 2019, there was one loan that was restructured that had subsequently defaulted during the reporting period. (dollars in thousands) Number of Loans Recorded Investment Year ended December 31, 2019 Commercial and industrial - other 1 $ 195 Total 1 $ 195 Beginning in March 2020, the Company has offered three-month payment deferrals for customers with a current payment status who were negatively impacted by economic disruption caused by the COVID-19 pandemic. These loans were not recorded as TDRs. Refer to Note 17 - Other Commitments, Contingencies, and Off-Balance Sheet Activities for more information regarding these modifications. Prior to the adoption of ASC 326 on January 1, 2020, the Company calculated allowance for loan losses using incurred losses methodology. The following tables are disclosures related to loans in prior periods. The following is a summary of total loans as of December 31, 2019: December 31, 2019 (In thousands) Business Acquired Total Commercial real estate: Construction $ 382,014 $ 47,792 $ 429,806 Other commercial real estate 2,414,942 1,189,521 3,604,463 Total commercial real estate 2,796,956 1,237,313 4,034,269 Commercial and industrial loans: 1,442,617 397,891 1,840,508 Total commercial loans 4,239,573 1,635,204 5,874,777 Residential mortgages: 1-4 family 2,143,817 533,536 2,677,353 Construction 4,641 3,478 8,119 Total residential mortgages 2,148,458 537,014 2,685,472 Consumer loans: Home equity 273,867 106,724 380,591 Auto and other 504,599 56,989 561,588 Total consumer loans 778,466 163,713 942,179 Total loans $ 7,166,497 $ 2,335,931 $ 9,502,428 Total unamortized net costs and premiums included in the December 31, 2019 total loans for business activity loans were the following: (In thousands) December 31, 2019 Unamortized net loan origination costs $ 13,259 Unamortized net premium on purchased loans 2,643 Total unamortized net costs and premiums $ 15,902 The following table summarizes activity in the accretable yield for the acquired loan portfolio that falls under the purview of ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality : (In thousands) 2019 2018 Balance at beginning of period $ 2,840 $ 11,561 Acquisitions 4,200 — Accretion (9,619) (23,109) Net reclassification from nonaccretable difference 7,430 17,347 Payments received, net (837) (2,878) Reclassification to TDR 9 — Disposals — (81) Balance at end of period 4,023 2,840 The following is a summary of past due loans at December 31, 2019: Business Activities Loans (in thousands) 30-59 Days 60-89 Days >90 Days Past Due Total Past Current Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 382,014 $ 382,014 $ — Commercial real estate 423 89 15,623 16,135 2,398,807 2,414,942 — Total 423 89 15,623 16,135 2,780,821 2,796,956 — Commercial and industrial loans Total 2,841 2,033 10,662 15,536 1,427,081 1,442,617 122 Residential mortgages: 1-4 family 1,669 714 3,350 5,733 2,138,084 2,143,817 800 Construction — — — — 4,641 4,641 — Total 1,669 714 3,350 5,733 2,142,725 2,148,458 800 Consumer loans: Home equity 149 — 1,147 1,296 272,571 273,867 52 Auto and other 4,709 990 2,729 8,428 496,171 504,599 1 Total 4,858 990 3,876 9,724 768,742 778,466 53 Total $ 9,791 $ 3,826 $ 33,511 $ 47,128 $ 7,119,369 $ 7,166,497 $ 975 Acquired Loans (in thousands) 30-59 Days 60-89 Days >90 Days Past Due Total Past Acquired Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 1,396 $ 47,792 $ — Commercial real estate 3,907 245 10,247 14,399 21,639 1,189,521 5,751 Total 3,907 245 10,247 14,399 23,035 1,237,313 5,751 Commercial and industrial loans Total 888 299 1,275 2,462 26,718 397,891 442 Residential mortgages: 1-4 family 745 491 932 2,168 10,840 533,536 139 Construction — — — — — 3,478 — Total 745 491 932 2,168 10,840 537,014 139 Consumer loans: Home equity 346 222 789 1,357 540 106,724 72 Auto and other 120 22 265 407 286 56,989 — Total 466 244 1,054 1,764 826 163,713 72 Total $ 6,006 $ 1,279 $ 13,508 $ 20,793 $ 61,419 $ 2,335,931 $ 6,404 The following is summary information pertaining to non-accrual loans at December 31, 2019: December 31, 2019 (In thousands) Business Activities Acquired Loans Total Commercial real estate: Construction $ — $ — $ — Other commercial real estate 15,623 4,496 20,119 Total 15,623 4,496 20,119 Commercial and industrial loans: Total 10,540 833 11,373 Residential mortgages: 1-4 family 2,550 793 3,343 Construction — — — Total 2,550 793 3,343 Consumer loans: Home equity 1,095 717 1,812 Auto and other 2,728 265 2,993 Total 3,823 982 4,805 Total non-accrual loans $ 32,536 $ 7,104 $ 39,640 Loans evaluated for impairment as of December 31, 2019 were as follows: Business Activities Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 19,192 $ 9,167 $ 3,019 $ 630 $ 32,008 Collectively evaluated 2,777,764 1,433,450 2,145,439 777,836 7,134,489 Total $ 2,796,956 $ 1,442,617 $ 2,148,458 $ 778,466 $ 7,166,497 Acquired Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 4,241 $ 464 $ 372 $ 575 $ 5,652 Purchased credit-impaired loans 23,035 26,718 10,840 826 61,419 Collectively evaluated 1,210,037 370,709 525,802 162,312 2,268,860 Total $ 1,237,313 $ 397,891 $ 537,014 $ 163,713 $ 2,335,931 The following is a summary of impaired loans at December 31, 2019: Business Activities Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 18,676 $ 37,493 $ — Commercial and industrial loans 4,805 10,104 — Residential mortgages - 1-4 family 433 699 — Consumer - home equity 32 238 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 550 $ 1,411 $ 20 Commercial and industrial loans 4,166 12,136 122 Residential mortgages - 1-4 family 2,615 2,924 109 Consumer - home equity 594 614 42 Consumer - other 8 8 1 Total Commercial real estate $ 19,226 $ 38,904 $ 20 Commercial and industrial loans 8,971 22,240 122 Residential mortgages 3,048 3,623 109 Consumer 634 860 43 Total impaired loans $ 31,879 $ 65,627 $ 294 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet. (2) The Unpaid Principal Balance represents the customer's legal obligation to the Company. Acquired Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 3,200 $ 6,021 $ — Other commercial and industrial loans 437 532 — Residential mortgages - 1-4 family 292 293 — Consumer - home equity 416 844 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 1,033 $ 1,050 $ 97 Commercial and industrial loans 28 30 1 Residential mortgages - 1-4 family 84 110 8 Consumer - home equity 121 123 6 Consumer - other 39 37 6 Total Commercial real estate $ 4,233 $ 7,071 $ 97 Commercial and industrial loans 465 562 1 Residential mortgages 376 403 8 Consumer 576 1,004 12 Total impaired loans $ 5,650 $ 9,040 $ 118 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet. (2) The Unpaid Principal Balance represents the customer's legal obligation to the Company. The following is a summary of the average recorded investment and interest income recognized on impaired loans as of December 31, 2019 and 2018: Business Activities Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 19,805 $ 586 $ 24,078 $ 373 Other commercial and industrial 3,165 523 914 245 Residential mortgages - 1-4 family 185 17 428 20 Consumer-home equity 148 3 107 10 Consumer-other — — — — With an allowance recorded: Other commercial real estate $ 374 $ 107 $ 555 $ 30 Other commercial and industrial 2,533 793 1,259 139 Residential mortgages - 1-4 family 2,427 150 1,407 75 Consumer-home equity 349 32 98 6 Consumer - other 11 1 15 1 Total Commercial real estate $ 20,179 $ 693 $ 24,633 $ 403 Commercial and industrial 5,698 1,316 2,173 384 Residential mortgages 2,612 167 1,835 95 Consumer loans 508 36 220 17 Total impaired loans $ 28,997 $ 2,212 $ 28,861 $ 899 Acquired Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 1,603 $ 117 $ 3,280 $ 263 Other commercial and industrial 441 51 428 68 Residential mortgages - 1-4 family 241 11 290 9 Consumer - home equity 475 23 635 4 Consumer - other — — 13 1 With an allowance recorded: Other commercial real estate $ 1,005 $ 59 $ 950 $ 53 Other commercial and industrial 29 2 197 41 Residential mortgages - 1-4 family 88 7 26 9 Consumer - home equity 68 6 89 12 Consumer - other 41 2 11 3 Total Commercial real estate $ 2,608 $ 176 $ 4,230 $ 316 Commercial and industrial 470 53 625 109 Residential mortgages 329 18 316 18 Consumer loans 584 31 748 20 Total impaired loans $ 3,991 $ 278 $ 5,919 $ 463 No additional funds are committed to be advanced in connection with impaired loans. The following table presents the Company’s TDR activity in 2019 and 2018: (In thousands) 2019 2018 Balance at beginning of year $ 27,415 $ 41,990 Principal payments (6,086) (8,547) TDR status change (1) — — Other reductions (2) (4,076) (8,713) Newly identified TDRs 2,063 2,685 Balance at end of year $ 19,316 $ 27,415 _____________________ (1) TDR status change classification represents TDR loans with a specified interest rate equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk and the loan was on current payment status and not impaired based on the terms specified by the restructuring agreement. (2) Other reductions classification consists of transfer to other real estate owned, charge-offs to loans, and other loan sale payoffs. Allowance for Loan Losses Prior to the adoption of ASC 326 on January 1, 2020, the Company calculated allowance for loan losses using incurred losses methodology. The following tables are disclosures related to the allowance for loan losses in prior periods. Activity in the allowance for loan losses for 2019 and 2018 was as follows: Business Activities Loans Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Charged-off loans 6,577 23,799 635 3,322 34,333 Recoveries on charged-off loans 570 1,012 57 253 1,892 Provision/(releases) for loan losses 9,033 25,404 (1,417) 458 33,478 Balance at end of period $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Individually evaluated for impairment 20 122 109 43 294 Collectively evaluated 24,738 18,999 8,431 4,714 56,882 Total $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Business Activities Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 16,843 $ 13,850 $ 9,420 $ 5,807 $ 45,920 Charged-off loans 5,859 4,275 157 3,187 13,478 Recoveries on charged-off loans 50 620 114 363 1,147 Provision/(releases) for loan losses 10,698 6,309 1,158 4,385 22,550 Balance at end of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Individually evaluated for impairment 9 49 128 11 197 Collectively evaluated 21,723 16,455 10,407 7,357 55,942 Total $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Charged-off loans 830 571 263 557 2,221 Recoveries on charged-off loans 672 438 116 123 1,349 Provision/(releases) for loan losses 1,111 126 365 339 1,941 Balance at end of period $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Individually evaluated for impairment 97 1 8 12 118 Collectively evaluated 4,009 1,056 840 376 6,281 Total $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,856 $ 1,125 $ 598 $ 335 $ 5,914 Charged-off loans 1,812 524 1,091 1,106 4,533 Recoveries on charged-off loans 294 286 51 417 1,048 Provision/(releases) for loan losses 815 177 1,072 837 2,901 Balance at end of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Individually evaluated for impairment 9 4 36 48 97 Collectively evaluated 3,144 1,060 594 435 5,233 Total $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 The following tables present the Company’s loans by risk rating at December 31, 2019: Business Activities Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 382,014 $ 2,354,375 $ 2,736,389 Special mention — 12,167 12,167 Substandard — 48,400 48,400 Total $ 382,014 $ 2,414,942 $ 2,796,956 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 1,366,342 Special mention 50,072 Substandard 24,112 Doubtful 2,091 Total $ 1,442,617 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 2,139,753 $ 4,641 $ 2,144,394 Special mention 714 — 714 Substandard 3,350 — 3,350 Total $ 2,143,817 $ 4,641 $ 2,148,458 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 272,772 $ 501,871 $ 774,643 Nonperforming 1,095 2,728 3,823 Total $ 273,867 $ 504,599 $ 778,466 Acquired Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 46,396 $ 1,130,333 $ 1,176,729 Special mention — 5,993 5,993 Substandard 1,396 53,195 54,591 Total $ 47,792 $ 1,189,521 $ 1,237,313 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 373,744 Special mention 4,404 Substandard 19,743 Total $ 397,891 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 528,282 $ 3,478 $ 531,760 Special mention 592 — 592 Substandard 4,662 — 4,662 Total $ 533,536 $ 3,478 $ 537,014 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 106,007 $ 56,724 $ 162,731 Nonperforming 717 265 982 Total $ 106,724 $ 56,989 $ 163,713 The following table summarizes information about total loans rated Special Mention or lower at December 31, 2019. The table below includes consumer loans that are Special Mention and Substandard accruing that are classified in the above table as performing based on payment activity. December 31, 2019 (In thousands) Business Acquired Loans Total Non-Accrual $ 32,536 $ 7,104 $ 39,640 Substandard Accruing 49,293 73,131 122,424 Total Classified 81,829 80,235 162,064 Special Mention 63,943 11,341 75,284 Total Criticized $ 145,772 $ 91,576 $ 237,348

PREMISES AND EQUIPMENT

PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
PREMISES AND EQUIPMENT	PREMISES AND EQUIPMENT Year-end premises and equipment are summarized as follows: (In thousands) 2020 2019 Estimated Useful Land $ 17,716 $ 17,816 N/A Buildings and improvements 113,853 116,997 5 - 39 years Furniture and equipment (1) 63,590 64,044 3 - 7 years Construction in process (1) 4,035 1,580 Premises and equipment, gross 199,194 200,437 Accumulated depreciation and amortization (1) (86,531) (78,966) Premises and equipment, net $ 112,663 $ 121,471 Premises and equipment, net from discontinued operations — 1,073 Premises and equipment, net from continuing operations $ 112,663 $ 120,398 (1) Includes premises and equipment classified as discontinued operations. See Note 2 - Discontinued Operations for more information. Depreciation and amortization expense including discontinued operations for the years 2020, 2019, and 2018 amounted to $12.5 million, $11.8 million, and $10.8 million, respectively.

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLES	GOODWILL AND OTHER INTANGIBLES Goodwill and other intangible assets are presented in the tables below. The Company had no acquisition during 2020. There was one acquisition during 2019. In accordance with applicable accounting guidance, the Company allocated the amount paid to the fair value of the net assets acquired, with any excess amounts recorded as goodwill. The goodwill balance is allocated to the consolidated Company. The activity impacting goodwill in 2020 and 2019 is as follows: (In thousands) 2020 2019 Balance, beginning of the period $ 553,762 $ 518,325 Goodwill acquired and adjusted: SI Financial Group, Inc. — 36,379 Adjustments (1) — (942) Impairment (553,762) — Balance, end of the period $ — $ 553,762 ______________________________________________________________________________________________________ (1) In 2019, goodwill related to the SI Financial Group acquisition was adjusted to reflect new information available during the one-year measurement period. Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Goodwill is assessed annually for impairment and more frequently if events or changes in circumstances indicate that there may be an impairment. The Company tests goodwill impairment annually as of June 30 using second quarter data. The Company compares the fair value of the reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. The fair value of the reporting unit was determined using the guideline public company method. As a result of the assessment, the Company recognized a full goodwill impairment during the year ended December 31, 2020. No impairment was recorded on goodwill for 2019. The primary causes of the goodwill impairment were economic and industry conditions resulting from the COVID-19 pandemic that caused volatility and reductions in the market capitalization of the Company and its peer banks, increased loan provision estimates, increased discount rates and other changes in variables driven by the uncertain macro-environment that resulted in the estimated fair value of the reporting unit being less than the reporting unit’s carrying value. The components of other intangible assets are as follows: (In thousands) Gross Intangible Accumulated Net Intangible December 31, 2020 Non-maturity deposits (core deposit intangible) (1) $ 77,213 $ (45,257) $ 31,956 Insurance contracts 7,558 (7,558) — All other intangible assets 7,866 (5,003) 2,863 Total $ 92,637 $ (57,818) $ 34,819 December 31, 2019 Non-maturity deposits (core deposit intangible) $ 84,903 $ (42,663) $ 42,240 Insurance contracts 7,558 (7,553) 5 All other intangible assets 7,866 (4,496) 3,370 Total $ 100,327 $ (54,712) $ 45,615 (1) As of December 31, 2020, the Company reclassified $4.6 million of net core deposit intangible to held-for-sale related to the assets and liabilities associated with the Mid-Atlantic branch sale. Other intangible assets are amortized on a straight-line or accelerated basis over their estimated lives, which range from four fifteen years . Amortization expense related to intangibles totaled $6.2 million in 2020, $5.8 million in 2019, and $4.9 million in 2018. The estimated aggregate future amortization expense for intangible assets remaining at year-end 2020 is as follows: 2021- $5.3 million; 2022- $5.1 million; 2023- $4.8 million; 2024- $4.6 million; 2025- $4.5 million; and thereafter- $10.6 million. For the years 2020, 2019, and 2018, no impairment charges were identified for the Company’s intangible assets.

OTHER ASSETS

OTHER ASSETS	12 Months Ended
	Dec. 31, 2020
Other Assets [Abstract]
OTHER ASSETS	OTHER ASSETS Year-end other assets are summarized as follows: (In thousands) 2020 2019 Capitalized servicing rights (1) $ 16,348 $ 26,451 Accrued interest receivable 46,919 36,462 Accrued federal and state tax receivable 40,751 23,786 Right-of-use assets (1) 60,018 76,332 Derivative assets (1) 160,071 80,190 Deferred tax asset 46,370 51,165 Other (1) 16,753 18,381 Total other assets $ 387,230 $ 312,767 Total other assets from discontinued operations — 23,822 Total other assets from continuing operations $ 387,230 $ 288,945 (1) Includes other assets classified as discontinued operations. See Note 2 - Discontinued Operations for more information. The Bank sells loans in the secondary market and retains the right to service many of these loans. The Bank earns fees for the servicing provided. Loans sold and serviced for others from continuing operations amounted to $1.5 billion, $1.7 billion, and $1.4 billion at year-end 2020, 2019, and 2018, respectively. Loans sold and serviced for others from discontinued operations amounted to $0.6 billion, $1.4 billion, and $0.8 billion at year-end 2020, 2019, and 2018. Loans serviced for others are not included in the accompanying Consolidated Balance Sheets. The risks inherent in servicing assets relate primarily to changes in prepayments that result from shifts in interest rates. Contractually specified servicing fees from continuing operations were $5.5 million, $5.6 million, and $4.6 million for the years 2020, 2019, and 2018, respectively, and included as a component of loan related fees within non-interest income. Contractually specified servicing fees from discontinued operations were $2.1 million, $1.9 million, and $1.0 million for the years 2020, 2019, and 2018, respectively, and included as a component of other income in Note 2 - Discontinued Operations. Refer to Note 20 - Fair Value Measurements for significant assumptions and inputs used in the valuation at year-end 2020. Servicing rights activity was as follows: (In thousands) 2020 2019 Balance at beginning of year $ 26,451 $ 23,376 Additions 3,875 16,837 Amortization (3,761) (3,240) Change in fair value (9,266) (5,822) Allowance adjustment (951) (4,700) Balance at end of year (1) $ 16,348 $ 26,451 (1) As of December 31, 2020 and December 31, 2019, the servicing rights included in the total balance accounted for at fair value were $3.0 million and $12.3 million, respectively.

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
DEPOSITS	DEPOSITS A summary of year-end time deposits is as follows: (In thousands) 2020 2019 Maturity date: Within 1 year $ 1,582,492 $ 2,734,870 Over 1 year to 2 years 545,100 582,622 Over 2 years to 3 years 171,810 145,976 Over 3 years to 4 years 32,358 90,731 Over 4 years to 5 years 51,073 33,754 Over 5 years 2,252 1,416 Total $ 2,385,085 $ 3,589,369 Account balances: Less than $100,000 $ 663,324 $ 905,190 $100,000 through $250,000 1,219,210 2,027,717 $250,000 or more 502,551 656,462 Total $ 2,385,085 $ 3,589,369 Included in total deposits on the Consolidated Balance Sheets are brokered deposits of $0.6 billion and $1.2 billion at December 31, 2020 and December 31, 2019, respectively. Also included in total deposits are reciprocal deposits of $119.0 million and $91.7 million at December 31, 2020 and December 31, 2019, respectively, as well as related party deposits of $177.2 million and $63.9 million at December 31, 2020 and December 31, 2019, respectively.

BORROWED FUNDS

BORROWED FUNDS	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
BORROWED FUNDS	BORROWED FUNDS Borrowed funds at December 31, 2020 and 2019 are summarized, as follows: 2020 2019 (in thousands, except rates) Principal Weighted Principal Weighted Short-term borrowings: Advances from the FHLBB $ 40,000 1.05 % $ 125,000 2.06 % Total short-term borrowings: 40,000 1.05 125,000 2.06 Long-term borrowings: Advances from the FHLBB 434,357 1.89 605,501 2.16 Paycheck Protection Program Liquidity Facility ("PPPLF") — — — — Subordinated notes 74,411 7.00 74,232 7.00 Junior subordinated borrowing - Trust I 15,464 2.06 15,464 3.76 Junior subordinated borrowing - Trust II 7,405 1.92 7,353 3.59 Total long-term borrowings: 531,637 2.61 702,550 2.72 Total $ 571,637 2.50 % $ 827,550 2.62 % Short-term debt includes Federal Home Loan Bank of Boston (“FHLBB”) advances with an original maturity of less than one year. At year-end 2020, the Company maintained a short-term line-of-credit through a correspondent bank with no balance outstanding. The Bank also maintains a $3.0 million secured line of credit with the FHLBB that bears a daily adjustable rate calculated by the FHLBB. There was no outstanding balance on the FHLBB line of credit for the periods ended December 31, 2020 and December 31, 2019. The Bank's available borrowing capacity with the FHLB was $1.0 billion and $1.6 billion for the periods ended December 31, 2020 and December 31, 2019, respectively. The Company was in compliance with all debt covenants as of December 31, 2020. The Bank is approved to borrow on a short-term basis from the Federal Reserve Bank of Boston as a non-member bank. The Bank has pledged certain loans and securities to the Federal Reserve Bank to support this arrangement. No borrowings with the Federal Reserve Bank of Boston took place for the periods ended December 31, 2020 and December 31, 2019. As a participant in the SBA Paycheck Protection Program ("PPP"), the Bank may pledge originated loans as collateral at face value to the Federal Reserve Bank of Boston for term financings. As of December 31, 2020, the Bank had no pledged PPP loans. The Bank's available borrowing capacity with the Federal Reserve Bank was $815.6 million and $201.3 million for the periods ended December 31, 2020 and December 31, 2019, respectively. Long-term FHLBB advances consist of advances with an original maturity of more than one year and are subject to prepayment penalties. The advances outstanding at December 31, 2020 included callable advances totaling $10 million and amortizing advances totaling $5.2 million. The advances outstanding at December 31, 2019 included callable advances totaling $10 million and amortizing advances totaling $4.4 million. All FHLBB borrowings, including the line of credit, are secured by a blanket security agreement on certain qualified collateral, principally all residential first mortgage loans and certain securities. A summary of maturities of FHLBB advances at year-end 2020 is as follows: 2020 (In thousands) Amount Weighted Fixed rate advances maturing: 2021 $ 395,475 1.80 % 2022 58,489 1.92 2023 10,916 2.17 2024 54 — 2025 and beyond 9,423 1.63 Total FHLBB advances $ 474,357 1.82 % The Company did not have variable-rate FHLB advances for the period ended December 31, 2020 and December 31, 2019. In September 2012, the Company issued fifteen year subordinated notes in the amount of $75.0 million at a discount of 1.15%. The interest rate is fixed at 6.875% for the first ten years. After ten years, the notes become callable and convert to an interest rate of three month LIBOR plus 5.113%. The subordinated note includes reduction to the note principal balance of $215 thousand and $338 thousand for unamortized debt issuance costs as of December 31, 2020 and December 31, 2019, respectively. The Company holds 100% of the common stock of Berkshire Hills Capital Trust I (“Trust I”) which is included in other assets with a cost of $0.5 million. The sole asset of Trust I is $15.5 million of the Company’s junior subordinated debentures due in 2035. These debentures bear interest at a variable rate equal to LIBOR plus 1.85% and had a rate of 2.06% and 3.76% at December 31, 2020 and December 31, 2019, respectively. The Company has the right to defer payments of interest for up to five years on the debentures at any time, or from time to time, with certain limitations, including a restriction on the payment of dividends to shareholders while such interest payments on the debentures have been deferred. The Company has not exercised this right to defer payments. The Company has the right to redeem the debentures at par value on each quarterly payment date. Trust I is considered a variable interest entity for which the Company is not the primary beneficiary. Accordingly, Trust I is not consolidated into the Company’s financial statements. The Company holds 100% of the common stock of SI Capital Trust II (“Trust II”) which is included in other assets with a cost of $0.2 million. The sole asset of Trust II is $8.2 million of the Company’s junior subordinated debentures due in 2036. These debentures bear interest at a variable rate equal to LIBOR plus 1.70% and had a rate of 1.92% and 3.59% at December 31, 2020 and December 31, 2019. The Company has the right to defer payments of interest for up to five years on the debentures at any time, or from time to time, with certain limitations, including a restriction on the payment of dividends to shareholders while such interest payments on the debentures have been deferred. The Company has not exercised this right to defer payments. The Company has the right to redeem the debentures at par value. Trust II is considered a variable interest entity for which the Company is not the primary beneficiary. Accordingly, Trust II is not consolidated into the Company’s financial statements.

OTHER LIABILITIES

OTHER LIABILITIES	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
OTHER LIABILITIES	OTHER LIABILITIES Year-end other liabilities are summarized as follows: (In thousands) 2020 2019 Derivative liabilities $ 65,758 $ 80,681 Capital and financing lease obligations 10,383 10,883 Asset purchase settlement payable (1) — 189 Employee benefits liability 38,830 44,781 Operating lease liabilities (1) 63,894 80,734 Accrued interest payable 3,867 11,625 Customer transaction clearing accounts 11,261 4,310 Other (1) 38,737 60,676 Total other liabilities $ 232,730 $ 293,879 Total other liabilities from discontinued operations — 26,481 Total other liabilities from continuing operations $ 232,730 $ 267,398 (1) Includes other liabilities classified as discontinued operations. See Note 2 - Discontinued Operations for more information.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Pension Plan The Company maintains a legacy, employer-sponsored defined benefit pension plan (the “Plan”) for which participation and benefit accruals were frozen on January 1, 2003. The Plan was assumed in connection with the Rome Bancorp acquisition in 2011. Accordingly, no employees are permitted to commence participation in the Plan and future salary increases and years of credited service are not considered when computing an employee’s benefits under the Plan. As of December 31, 2020, all minimum Employee Retirement Income Security Act (“ERISA”) funding requirements have been met. Information regarding the pension plan is as follows: December 31, (In thousands) 2020 2019 Change in projected benefit obligation: Projected benefit obligation at beginning of year $ 5,848 $ 5,669 Service Cost 66 72 Interest cost 178 228 Actuarial loss 519 542 Benefits paid (337) (333) Settlements (153) (330) Projected benefit obligation at end of year 6,121 5,848 Accumulated benefit obligation 6,121 5,848 Change in fair value of plan assets: Fair value of plan assets at plan beginning of year 5,799 5,522 Actual return on plan assets 740 940 Contributions by employer — — Benefits paid (337) (333) Settlements (153) (330) Fair value of plan assets at end of year 6,049 5,799 Underfunded status $ 72 $ 49 Amounts Recognized on Consolidated Balance Sheets Other Liabilities $ 72 $ 49 Net periodic pension cost is comprised of the following: December 31, (In thousands) 2020 2019 Service Cost $ 66 $ 72 Interest Cost 178 228 Expected return on plan assets (393) (373) Amortization of unrecognized actuarial loss 94 117 Net periodic pension costs $ (55) $ 44 Changes in plan assets and benefit obligations recognized in accumulated other comprehensive income are as follows: December 31, (In thousands) 2020 2019 Amortization of actuarial (loss) $ (94) $ (117) Actuarial (gain) loss 171 (25) Settlement charge — (70) Total recognized in accumulated other comprehensive income 77 (212) Total recognized in net periodic pension cost recognized and other comprehensive income $ 22 $ (168) The amounts in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit cost are a net loss of $1.3 million and $1.2 million in 2020 and 2019, respectively. The Company did not make any cash contributions to the pension trust during 2020 and 2019. The Company does not expect to make any cash contributions in 2021. The amount expected to be amortized from other comprehensive income into net periodic pension cost over the next fiscal year is $103 thousand. The principal actuarial assumptions used are as follows: December 31, 2020 2019 Projected benefit obligation Discount rate 2.35 % 3.15 % Net periodic pension cost Discount rate 3.15 % 4.16 % Long term rate of return on plan assets 7.00 % 7.00 % The discount rate that is used in the measurement of the pension obligation is determined by comparing the expected future retirement payment cash flows of the pension plan to the Above Median FTSE Pension Discount Curve as of the measurement date. The expected long-term rate of return on Plan assets reflects long-term earnings expectations on existing Plan assets and those contributions expected to be received during the current plan year. In estimating that rate, appropriate consideration was given to historical returns earned by Plan assets in the fund and the rates of return expected to be available for reinvestment. The rates of return were adjusted to reflect current capital market assumptions and changes in investment allocations. The Company’s overall investment strategy with respect to the Plan’s assets is primarily for preservation of capital and to provide regular dividend and interest payments. The Plan’s targeted asset allocation is 65% equity securities via investment in the Long-Term Growth - Equity Portfolio ("LTGE"), 34% intermediate-term investment grade bonds via investment in the Long-Term Growth - Fixed-Income Portfolio ("LTGFI"), and 1% in cash equivalents portfolio (for liquidity). Equity securities include investments in a diverse mix of equity funds to gain exposure in the US and international markets. The fixed income portion of the Plan assets is a diversified portfolio that primarily invests in intermediate-term bond funds. The overall rate of return is based on the historical performance of the assets applied against the Plan’s target allocation, and is adjusted for the long-term inflation rate. The fair values for investment securities are determined by quoted prices in active markets, if available (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3). The fair value of the Plan’s assets by category within the fair value hierarchy are as follows at December 31, 2020 and December 31, 2019. The Plan did not hold any assets classified as Level 3, nor were there any transfers. December 31, 2020 Asset Category (In thousands) Total Level 1 Level 2 Equity Mutual Funds: Large-Cap $ 1,996 $ — $ 1,996 Mid-Cap 519 — 519 Small-Cap 500 — 500 International 1,049 — 1,049 Fixed Income - US Core 1,403 — 1,403 Intermediate Duration 470 — 470 Cash Equivalents - money market 112 38 74 Total $ 6,049 $ 38 $ 6,011 December 31, 2019 Asset Category (In thousands) Total Level 1 Level 2 Equity Mutual Funds: Large-Cap $ 1,900 $ — $ 1,900 Mid-Cap 453 — 453 Small-Cap 429 — 429 International 828 — 828 Fixed Income - US Core 1,535 — 1,535 Intermediate Duration 517 — 517 Cash Equivalents - money market 137 60 77 Total $ 5,799 $ 60 $ 5,739 Estimated benefit payments under the pension plans over the next 10 years at December 31, 2020 are as follows: Year Payments (In thousands) 2021 370 2022 382 2023 367 2024 357 2025 - 2030 1,888 Multi-Employer Pension Plan As a result of the Company's acquisition of SI Financial Group, Inc. (“SIFI”), the Company participates in the Pentegra Defined Benefit Plan for Financial Institutions (the “Plan”), a tax-qualified defined benefit pension plan. The Plan operates as a multiple-employer plan under ERISA and the Internal Revenue Code, and as a multi-employer plan for accounting purposes. The Plan was frozen effective September 6, 2013. The Company made contributions of $377 thousand in 2020. As of July 1, 2020, the Plan held assets with a market value of $4.5 million and liabilities with a market value of $7.9 million. The funded status (market value of plan assets divided by funding target) of the Plan, was greater than 80% as of July 1, 2020, as required by federal and state regulations. Market value of the Plan's assets reflects contributions received through June 30, 2020. There are no collective bargaining agreements in place that require contributions to the Plan by the Company. The Plan is a single plan under the Internal Revenue Code and, as a result, all of the assets stand behind all of the liabilities. Accordingly, contributions made by a participating employer may be used to provide benefits to participants of other participating employers. Postretirement Benefits The Company maintains an unfunded postretirement medical plan assumed in connection with the Rome Bancorp acquisition in 2011. The postretirement plan has been modified so that participation is closed to those employees who did not meet the retirement eligibility requirements by March 31, 2011. The Company contributes partially to medical benefits and life insurance coverage for retirees. Such retirees and their surviving spouses are responsible for the remainder of the medical benefits, including increases in premiums levels, between the total premium and the Company’s contribution. The Company also has an executive long-term care (“LTC”) postretirement benefit plan which started August 1, 2014. The LTC plan reimburses executives for certain costs in the event of a future chronic illness. Funding of the plan comes from Company paid insurance policies or direct payments. At plan’s inception, a $558 thousand benefit obligation was recorded against equity representing the prior service cost of plan participants. Information regarding the postretirement plans is as follows: December 31, (In thousands) 2020 2019 Change in accumulated postretirement benefit obligation: Accumulated post-retirement benefit obligation at beginning of year $ 4,039 $ 3,422 Service Cost 39 38 Interest cost 129 142 Participant contributions — — Actuarial loss 507 565 Benefits paid (73) (128) Accumulated post-retirement benefit obligation at end of year $ 4,641 $ 4,039 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Contributions by employer 73 128 Contributions by participant — — Benefits paid (73) (128) Fair value of plan assets at end of year $ — $ — Amounts Recognized on Consolidated Balance Sheets Other Liabilities $ 4,641 $ 4,039 Net periodic post-retirement cost is comprised of the following: December 31, (In thousands) 2020 2019 Service cost $ 39 $ 38 Interest costs 129 142 Amortization of net prior service credit 84 83 Amortization of net actuarial loss 12 — Net periodic post-retirement costs $ 264 $ 263 Changes in benefit obligations recognized in accumulated other comprehensive income are as follows: December 31, (In thousands) 2020 2019 Amortization of prior service credit $ (84) $ (83) Net actuarial loss (gain) 496 374 Total recognized in accumulated other comprehensive income 412 291 Accrued post-retirement liability recognized $ 4,641 $ 4,039 The amounts in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit cost are as follows: December 31, (In thousands) 2020 2019 Net prior service cost (credit) $ 1,325 $ 1,409 Net actuarial loss (gain) 869 374 Total recognized in accumulated other comprehensive income $ 2,194 $ 1,783 The amount expected to be amortized from other comprehensive income into net periodic postretirement cost over the next fiscal year is $83 thousand. The discount rates used in the measurement of the postretirement plan obligations are determined by comparing the expected future retirement payment cash flows of the plans to the Above Median FTSE Pension Discount Curve as of the measurement date. The assumed discount rates on a weighted-average basis were 2.16% and 3.06% as of December 31, 2020 and December 31, 2019, respectively. The Company has fixed contributions, therefore, the annual rate of increase in healthcare costs is not used in measuring the accumulated post-retirement benefit medical obligation. For participants in the LTC plan covered by insurance policies, no increase in annual premiums is assumed based on the history of the corresponding insurance provider. Estimated benefit payments under the post-retirement benefit plan over the next ten years at December 31, 2020 are as follows: Year Payments (In thousands) 2021 123 2022 121 2023 118 2024 117 2025 - 2030 642 401(k) Plan The Company provides a 401(k) Plan in which most eligible employees participate. Expense related to the plan was $3.5 million in 2020, $4.1 million in 2019, and $3.9 million in 2018. Employee Stock Ownership Plan (“ESOP”) As part of the SI Financial acquisition in 2019, the Company acquired an ESOP plan that was frozen and terminated prior to the completion of the transaction. On acquisition date, all amounts in the plan were vested and the loan under the plans was repaid from the sale proceeds of unallocated shares. Other Plans The Company maintains supplemental executive retirement plans (“SERPs”) for select current and former executives. Benefits generally commence no earlier than age sixty-two During 2020, the Company released $0.9 million of accrued SERP liability, following a transition in the Company's Chief Executive Officer position. The separation agreement did not entitle the former executive to any future benefits, including the associated SERP, other than those described in the agreement. The Company has endorsement split-dollar arrangements pertaining to certain current and former executives and directors. Under these arrangements, the Company purchased policies insuring the lives of the executives and directors, and separately entered into agreements to split the policy benefits with the individuals. There are no post-retirement benefits associated with these policies. The Company also assumed split-dollar life insurance agreements from multiple prior acquisitions. The accrued liability for these split-dollar arrangements was $7.9 million as of year-end 2020 and $7.1 million as of year-end 2019.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Provision for Income Taxes The components of the Company’s provision for income taxes for the years ended December 31, 2020, 2019, and 2018 were, as follows: (In thousands) 2020 2019 2018 Current: Federal tax (benefit)/expense $ (19,889) $ 16,576 $ 12,634 State tax (benefit)/expense (3,976) 5,323 4,114 Total current tax (benefit)/expense (1) (23,865) 21,899 16,748 Deferred: Federal tax expense 2,048 908 8,443 State tax expense/(benefit) 1,964 (344) 3,770 Total deferred tax expense 4,012 564 12,213 Change in valuation allowance — — — Income tax (benefit)/expense from continuing operations $ (19,853) $ 22,463 $ 28,961 Income tax (benefit) from discontinued operations (7,013) (1,468) (1,313) Total $ (26,866) $ 20,995 $ 27,648 (1) On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") was signed into law. The CARES Act includes several provisions that temporarily modify the corporate net operating loss (“NOL”) carryback rules for federal income tax purposes. Specifically, the CARES Act allows a five-year carryback of any NOL generated in a taxable year beginning after December 31, 2017, and before January 1, 2021. The Company recorded a $6 million federal income tax benefit in 2020 resulting from the carryback of its 2020 NOL to recover federal income taxes paid in 2015 through 2017 at a 35% federal income tax rate. Effective Tax Rate The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2020, 2019, and 2018: 2020 2019 2018 (In thousands, except rates) Amount Rate Amount Rate Amount Rate Statutory tax rate $ (111,936) 21.0 % $ 26,037 21.0 % $ 29,018 21.0 % Increase (decrease) resulting from: State taxes, net of federal tax benefit (1,589) 0.3 3,641 2.9 7,081 5.1 Tax exempt income - investments, net (3,184) 0.6 (3,527) (2.8) (3,620) (2.6) Bank-owned life insurance (1,283) 0.3 (1,305) (1.1) (1,337) (1.0) Goodwill impairment 103,912 (19.5) — — — — Non-deductible merger costs — — 122 0.1 181 0.1 Tax credits, net of basis reduction (1,812) 0.3 (3,531) (2.8) (3,574) (2.6) Tax rate benefit on net operating loss carryback (6,040) 1.1 — — — — Other, net 2,079 (0.4) 1,026 0.8 1,212 0.9 Effective tax rate $ (19,853) 3.7 % $ 22,463 18.1 % $ 28,961 20.9 % Deferred Tax Assets and Liabilities As of December 31, 2020 and 2019, significant components of the Company’s deferred tax assets and liabilities were, as follows: (In thousands) 2020 2019 Deferred tax assets: Allowance for credit losses $ 35,650 $ 17,446 Unrealized capital loss on tax credit investments 2,360 6,195 Employee benefit plans 7,607 10,565 Purchase accounting adjustments 8,843 39,359 Net operating loss carryforwards 1,753 951 Lease liability 20,119 22,497 Premises and equipment 1,097 739 Nonaccrual interest 1,780 587 Other 1,733 501 Deferred tax assets, net before valuation allowances 80,942 98,840 Valuation allowance (200) (200) Deferred tax assets, net of valuation allowances $ 80,742 $ 98,640 Deferred tax liabilities: Net unrealized gain on securities available for sale and pension in OCI $ (10,602) $ (4,244) Loan servicing rights (1,674) (4,669) Deferred loan fees (368) (1,667) Intangible amortization (2,277) (18,557) Unamortized tax credit reserve (1,086) (1,142) Right-of-use asset (18,365) (20,614) Deferred tax liabilities $ (34,372) $ (50,893) Deferred tax assets, net $ 46,370 $ 47,747 Deferred tax liabilities from discontinued operations $ — $ (3,418) Deferred tax assets, net from continuing operations $ 46,370 $ 51,165 The Company’s net deferred tax asset decreased by $1.4 million during 2020. Deferred tax assets, net of valuation allowances, are expected to be realized through the reversal of existing taxable temporary differences and future taxable income. Valuation Allowances The components of the Company’s valuation allowance on its deferred tax asset, net as of December 31, 2020 and 2019 were, as follows: (in thousands) 2020 2019 State tax basis difference, net of Federal tax benefit $ (200) $ (200) Valuation allowances $ (200) $ (200) The state tax basis difference, net of Federal tax benefit, was originally recorded in 2012, due to management’s assessment that it is more likely than not that certain deferred tax assets recorded for the difference between the book basis and the state tax basis in certain tax credit limited partnership investments (LPs) will not be realized. Management anticipates that the remaining excess state tax basis will be realized as a capital loss upon disposition, and that it is unlikely that the Company will have capital gains against which to offset such capital losses. There was no change in the valuation allowance during 2020. The valuation allowance as of December 31, 2020 is subject to change in the future as the Company continues to periodically assess the likelihood of realizing its deferred tax assets. Tax Attributes At December 31, 2020, the Company has $4.5 million of federal net operating loss carryforwards, the utilization of which are limited under Internal Revenue Code Section 382. These net operating losses begin to expire in 2029. The related deferred tax asset is $1.0 million. State net operating loss carryforwards are expected to be utilized in 2021. The related deferred tax asset is $803 thousand. Unrecognized Tax Benefits On a periodic basis, the Company evaluates its income tax positions based on tax laws and regulations and financial reporting considerations, and records adjustments as appropriate. This evaluation takes into consideration the status of taxing authorities’ current examinations of the Company’s tax returns, recent positions taken by the taxing authorities on similar transactions, if any, and the overall tax environment in relation to uncertain tax positions. The following table presents changes in unrecognized tax benefits for the years ended December 31, 2020, 2019, and 2018: (In thousands) 2020 2019 2018 Unrecognized tax benefits at January 1 $ 238 $ 467 $ 304 Increase in gross amounts of tax positions related to prior years 309 26 533 Decrease in gross amounts of tax positions related to prior years — — (370) Decrease due to settlement with taxing authority — (185) — Decrease due to lapse in statute of limitations (31) (70) — Unrecognized tax benefits at December 31 $ 516 $ 238 $ 467 It is reasonably possible that over the next twelve months the amount of unrecognized tax benefits may change from the reevaluation of uncertain tax positions arising in examinations, in appeals, or in the courts, or from the closure of tax statutes. The Company does not expect any significant changes in unrecognized tax benefits during the next twelve months. All of the Company’s unrecognized tax benefits, if recognized, would be recorded as a component of income tax expense, therefore, affecting the effective tax rate. The Company recognizes interest and penalties, if any, related to the liability for uncertain tax positions as a component of income tax expense. The accrual for interest and penalties was not material for all years presented. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as in various states. In the normal course of business, the Company is subject to U.S. federal, state, and local income tax examinations by tax authorities. The Company is no longer subject to examination for tax years prior to 2017 including any related income tax filings from its recent acquisitions. The Company has been selected for audit in the state of New York for tax years 2015-2017.

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES At year-end 2020, the Company held derivatives with a total notional amount of $3.9 billion. The Company had economic hedges and non-hedging derivatives totaling $3.8 billion and $40.1 million, respectively, which are not designated as hedges for accounting purposes and are therefore recorded at fair value with changes in fair value recorded directly through earnings. Economic hedges included interest rate swaps totaling $3.5 billion, risk participation agreements with dealer banks of $326.9 million, and $11.5 million in forward commitment contracts. Forward sale commitments and commitments to lend are included in discontinued operations. As part of the Company’s risk management strategy, the Company enters into interest rate swap agreements to mitigate the interest rate risk inherent in certain of the Company’s assets and liabilities. Interest rate swap agreements involve the risk of dealing with both Bank customers and institutional derivative counterparties and their ability to meet contractual terms. The agreements are entered into with counterparties that meet established credit standards and contain master netting and collateral provisions protecting the at-risk party. The derivatives program is overseen by the Risk Management Committee of the Company’s Board of Directors. Based on adherence to the Company’s credit standards and the presence of the netting and collateral provisions, the Company believes that the credit risk inherent in these contracts was not significant at December 31, 2020. The Company pledged collateral to derivative counterparties in the form of cash totaling $75.1 million and securities with an amortized cost of $37.5 million and a fair value of $37.8 million at year-end 2020. At December 31, 2019, the Company pledged cash collateral of $96.3 million and securities with an amortized cost of $25.7 million and a fair value of $25.8 million. The Company does not typically require its commercial customers to post cash or securities as collateral on its program of back-to-back economic hedges. However certain language is written into the International Swaps Dealers Association, Inc. (“ISDA”) and loan documents where, in default situations, the Bank is allowed to access collateral supporting the loan relationship to recover any losses suffered on the derivative asset or liability. The Company may need to post additional collateral in the future in proportion to potential increases in unrealized loss positions. Information about interest rate swap agreements and non-hedging derivative assets and liabilities at December 31, 2020 follows: Notional Weighted Weighted Average Rate Estimated December 31, 2020 Received Contract pay rate (In thousands) (In years) (In thousands) Economic hedges: Interest rate swap on tax advantaged economic development bond $ 8,654 8.9 0.52 % 5.09 % $ (1,778) Interest rate swaps on loans with commercial loan customers 1,734,978 6.1 4.15 % 1.95 % 159,016 Reverse interest rate swaps on loans with commercial loan customers 1,734,978 6.1 1.95 % 4.15 % (64,645) Risk participation agreements with dealer banks 326,862 8.0 665 Forward sale commitments 11,544 0.2 320 Total economic hedges 3,817,016 93,578 Non-hedging derivatives: Commitments to lend 40,099 0.2 735 Total non-hedging derivatives 40,099 735 Total $ 3,857,115 $ 94,313 Information about interest rate swap agreements and non-hedging derivative asset and liabilities at December 31, 2019 follows: Notional Weighted Weighted Average Rate Estimated December 31, 2019 Received Contract pay rate (In thousands) (In years) (In thousands) Economic hedges: Interest rate swap on tax advantaged economic development bond $ 9,390 9.9 2.08 % 5.09 % $ (1,488) Interest rate swaps on loans with commercial loan customers 1,669,895 6.4 4.38 % 3.28 % 75,326 Reverse interest rate swaps on loans with commercial loan customers 1,669,895 6.4 3.28 % 4.38 % (77,051) Risk participation agreements with dealer banks 315,140 7.5 320 Forward sale commitments (1) 237,412 0.2 (227) Total economic hedges 3,901,732 (3,120) Non-hedging derivatives: Commitments to lend (1) 168,997 0.2 2,628 Total non-hedging derivatives 168,997 2,628 Total $ 4,070,729 $ (492) (1) Includes the impact of discontinued operations. Economic hedges As of December 31, 2020 the Company has an interest rate swap with a $8.7 million notional amount to swap out the fixed rate of interest on an economic development bond bearing a fixed rate of 5.09%, currently within the Company’s trading portfolio under the fair value option, in exchange for a LIBOR-based floating rate. The intent of the economic hedge is to improve the Company’s asset sensitivity to changing interest rates in anticipation of favorable average floating rates of interest over the 21-year life of the bond. The fair value changes of the economic development bond are mostly offset by fair value changes of the related interest rate swap. The Company also offers certain derivative products directly to qualified commercial borrowers. The Company economically hedges derivative transactions executed with commercial borrowers by entering into mirror-image, offsetting derivatives with third-party financial institutions. The transaction allows the Company’s customer to convert a variable-rate loan to a fixed rate loan. Because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts mostly offset each other in earnings. Credit valuation loss adjustments arising from the difference in credit worthiness of the commercial loan and financial institution counterparties totaled $1.5 million at year-end 2020. The interest income and expense on these mirror image swaps exactly offset each other. The Company has risk participation agreements with dealer banks. Risk participation agreements occur when the Company participates on a loan and a swap where another bank is the lead. The Company earns a fee to take on the risk associated with having to make the lead bank whole on Berkshire’s portion of the pro-rated swap should the borrower default. The Company utilizes forward sale commitments to hedge interest rate risk and the associated effects on the fair value of interest rate lock commitments and loans held for sale. The forward sale commitments are accounted for as derivatives with changes in fair value recorded in current period earnings. Forward sale commitments are included in discontinued operations. The company uses the following types of forward sale commitments contracts: • Best efforts loan sales, • Mandatory delivery loan sales, and • To be announced (TBA) mortgage-backed securities sales. A best efforts contract refers to a loan sales agreement where the Company commits to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. The Company may enter into a best efforts contract once the price is known, which is shortly after the potential borrower’s interest rate is locked. A mandatory delivery contract is a loan sales agreement where the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. Generally, the Company may enter into mandatory delivery contracts shortly after the loan closes with a customer. The Company may sell to-be-announced mortgage-backed securities to hedge the changes in fair value of interest rate lock commitments and held for sale loans, which do not have corresponding best efforts or mandatory delivery contracts. These security sales transactions are closed once mandatory contracts are written. On the closing date the price of the security is locked-in, and the sale is paired-off with a purchase of the same security. Settlement of the security purchase/sale transaction is done with cash on a net-basis. Non-hedging derivatives The Company enters into commitments to lend for residential mortgage loans, which commit the Company to lend funds to a potential borrower at a specific interest rate and within a specified period of time. Commitments that relate to the origination of mortgage loans that will be held for sale are considered derivative financial instruments under applicable accounting guidance. Outstanding commitments expose the Company to the risk that the price of the mortgage loans underlying the commitments may decline due to increases in mortgage interest rates from inception of the rate lock to the funding of the loan. The commitments are free-standing derivatives which are carried at fair value with changes recorded in non-interest income in the Company’s Consolidated Statements of Operations. Changes in the fair value of commitments subsequent to inception are based on changes in the fair value of the underlying loan resulting from the fulfillment of the commitment and changes in the probability that the loan will fund within the terms of the commitment, which is affected primarily by changes in interest rates and the passage of time. Commitments to lend are included in discontinued operations. Amounts included in the Consolidated Statements of Operations related to economic hedges and non-hedging derivatives were as follows: Years Ended December 31, (In thousands) 2020 2019 2018 Economic hedges Interest rate swap on industrial revenue bond: Unrealized (loss)/gain recognized in other non-interest income $ (289) $ (248) $ 409 Interest rate swaps on loans with commercial loan customers: Unrealized gain/(loss) recognized in other non-interest income 85,206 65,098 8,758 (Unfavorable) change in credit valuation adjustment recognized in other non-interest income (1,516) (1,214) (519) Reverse interest rate swaps on loans with commercial loan customers: Unrealized (loss)/gain recognized in other non-interest income (85,206) (65,098) (8,758) Risk Participation Agreements: Unrealized gain/(loss) recognized in other non-interest income 345 83 263 Forward Commitments: Unrealized gain/(loss) recognized in discontinued operations 547 507 (611) Realized (loss) in discontinued operations (8,205) (9,195) (1,532) Non-hedging derivatives Commitments to lend: Unrealized (loss)/gain recognized in discontinued operations $ (1,893) $ (1,299) $ 3,358 Realized gain in discontinued operations 15,672 57,699 33,982 Assets and Liabilities Subject to Enforceable Master Netting Arrangements Interest Rate Swap Agreements (“Swap Agreements”) The Company enters into swap agreements to facilitate the risk management strategies for commercial banking customers. The Company mitigates this risk by entering into equal and offsetting swap agreements with highly rated third party financial institutions. The swap agreements are free-standing derivatives and are recorded at fair value in the Company’s Consolidated Balance Sheets. The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all swap agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral generally in the form of marketable securities is received or posted by the counterparty with net liability positions, respectively, in accordance with contract thresholds. The Company had net asset positions with its financial institution counterparties totaling $1.0 million and $0.6 million as of December 31, 2020 and December 31, 2019, respectively. The Company had net asset positions with its commercial banking counterparties totaling $159.0 million and $76.4 million as of December 31, 2020 and December 31, 2019, respectively. The Company had net liability positions with its financial institution counterparties totaling $66.8 million and $78.8 million as of December 31, 2020 and December 31, 2019, respectively. The Company had no net liability positions with its commercial banking counterparties as of December 31, 2020. The Company had net liability positions with its commercial banking counterparties totaling $1.1 million as of December 31, 2019. The Company has collateral pledged to cover this liability. The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of December 31, 2020 and December 31, 2019: Offsetting of Financial Assets and Derivative Assets Gross Gross Amounts Net Amounts of Assets Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2020 Interest Rate Swap Agreements: Institutional counterparties $ 1,124 $ (78) $ 1,046 $ — $ — $ 1,046 Commercial counterparties 159,016 — 159,016 — — 159,016 Total $ 160,140 $ (78) $ 160,062 $ — $ — $ 160,062 Offsetting of Financial Liabilities and Derivative Liabilities Gross Gross Amounts Net Amounts of Liabilities Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2020 Interest Rate Swap Agreements: Institutional counterparties $ (164,543) $ 97,740 $ (66,803) $ 37,815 $ 75,070 $ 46,082 Commercial counterparties — — — — — — Total $ (164,543) $ 97,740 $ (66,803) $ 37,815 $ 75,070 $ 46,082 Offsetting of Financial Assets and Derivative Assets Gross Gross Amounts Net Amounts of Assets Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2019 Interest Rate Swap Agreements: Institutional counterparties $ 640 $ (54) $ 586 $ — $ — $ 586 Commercial counterparties 76,428 (22) 76,406 — — 76,406 Total $ 77,068 $ (76) $ 76,992 $ — $ — $ 76,992 Offsetting of Financial Liabilities and Derivative Liabilities Gross Gross Amounts Net Amounts of Liabilities Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2019 Interest Rate Swap Agreements: Institutional counterparties $ (80,024) $ 1,219 $ (78,805) $ 25,828 $ 96,310 $ 43,333 Commercial counterparties (1,080) — (1,080) — — (1,080) Total $ (81,104) $ 1,219 $ (79,885) $ 25,828 $ 96,310 $ 42,253

LEASES

LEASES	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
LEASES	LEASES Substantially all of the leases in which the Company is the lessee are comprised of real estate property for branches, ATM locations, and office space. Most of the Company’s leases are classified as operating leases. At December 31, 2020 lease expiration dates ranged from 1 month to 19 years. The following table represents the Consolidated Balance Sheets classification of the Company’s right-of-use (“ROU”) assets and lease liabilities: (In thousands) December 31, 2020 December 31, 2019 Lease Right-of-Use Assets Classification Operating lease right-of-use assets (1) Other assets $ 60,018 $ 76,332 Finance lease right-of-use assets Premises and equipment, net 7,197 7,720 Total Lease Right-of-Use Assets $ 67,215 $ 84,052 Lease Liabilities Operating lease liabilities (2) Other liabilities $ 63,894 $ 80,734 Finance lease liabilities Other liabilities 10,383 10,883 Total Lease Liabilities $ 74,277 $ 91,617 (1) There are no operating lease right-of-use assets classified as discontinued operations as of December 31, 2020. There are operating lease right-of-use assets classified as discontinued operations of $3.5 million as of December 31, 2019. (2) There are no operating lease liabilities classified as discontinued operations as of December 31, 2020. There are operating lease liabilities classified as discontinued operations of $3.5 million as of December 31, 2019. Supplemental information related to leases was as follows: December 31, 2020 December 31, 2019 Weighted-Average Remaining Lease Term (in years) Operating leases 9.8 10.3 Finance leases 13.8 14.8 Weighted-Average Discount Rate Operating leases 2.81 % 3.36 % Finance leases 5.00 % 5.00 % 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 does not have any material sub-lease agreements. Lease expense for operating leases for the year ended December 31, 2020 was $13.5 million, of which $1.2 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. Lease expense for operating leases for the year ended December 31, 2019 was $14.4 million, of which $2.8 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. Supplemental cash flow information related to leases was as follows: (In thousands) December 31, 2020 December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases (1) $ 13,750 $ 14,731 Operating cash flows from finance leases 530 553 Financing cash flows from finance leases 500 435 Right-of-use assets obtained in exchange for lease obligations: Operating leases (1) 7,083 88,079 Finance leases — — (1) Includes operating cash flows from operating leases related to discontinued operations of $1.2 million and $2.8 million at December 31, 2020 and December 31, 2019, respectively. The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2020: (In thousands) Operating Leases Finance Leases 2021 $ 10,875 $ 1,023 2022 9,990 1,031 2023 8,752 1,037 2024 7,508 1,037 2025 5,668 1,037 Thereafter 31,215 9,223 Total undiscounted lease payments 74,008 14,388 Less amounts representing interest (10,114) (4,005) Lease liability $ 63,894 $ 10,383
LEASES	LEASES Substantially all of the leases in which the Company is the lessee are comprised of real estate property for branches, ATM locations, and office space. Most of the Company’s leases are classified as operating leases. At December 31, 2020 lease expiration dates ranged from 1 month to 19 years. The following table represents the Consolidated Balance Sheets classification of the Company’s right-of-use (“ROU”) assets and lease liabilities: (In thousands) December 31, 2020 December 31, 2019 Lease Right-of-Use Assets Classification Operating lease right-of-use assets (1) Other assets $ 60,018 $ 76,332 Finance lease right-of-use assets Premises and equipment, net 7,197 7,720 Total Lease Right-of-Use Assets $ 67,215 $ 84,052 Lease Liabilities Operating lease liabilities (2) Other liabilities $ 63,894 $ 80,734 Finance lease liabilities Other liabilities 10,383 10,883 Total Lease Liabilities $ 74,277 $ 91,617 (1) There are no operating lease right-of-use assets classified as discontinued operations as of December 31, 2020. There are operating lease right-of-use assets classified as discontinued operations of $3.5 million as of December 31, 2019. (2) There are no operating lease liabilities classified as discontinued operations as of December 31, 2020. There are operating lease liabilities classified as discontinued operations of $3.5 million as of December 31, 2019. Supplemental information related to leases was as follows: December 31, 2020 December 31, 2019 Weighted-Average Remaining Lease Term (in years) Operating leases 9.8 10.3 Finance leases 13.8 14.8 Weighted-Average Discount Rate Operating leases 2.81 % 3.36 % Finance leases 5.00 % 5.00 % 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 does not have any material sub-lease agreements. Lease expense for operating leases for the year ended December 31, 2020 was $13.5 million, of which $1.2 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. Lease expense for operating leases for the year ended December 31, 2019 was $14.4 million, of which $2.8 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. Supplemental cash flow information related to leases was as follows: (In thousands) December 31, 2020 December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases (1) $ 13,750 $ 14,731 Operating cash flows from finance leases 530 553 Financing cash flows from finance leases 500 435 Right-of-use assets obtained in exchange for lease obligations: Operating leases (1) 7,083 88,079 Finance leases — — (1) Includes operating cash flows from operating leases related to discontinued operations of $1.2 million and $2.8 million at December 31, 2020 and December 31, 2019, respectively. The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2020: (In thousands) Operating Leases Finance Leases 2021 $ 10,875 $ 1,023 2022 9,990 1,031 2023 8,752 1,037 2024 7,508 1,037 2025 5,668 1,037 Thereafter 31,215 9,223 Total undiscounted lease payments 74,008 14,388 Less amounts representing interest (10,114) (4,005) Lease liability $ 63,894 $ 10,383

OTHER COMMITMENTS, CONTINGENCIE

OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES	OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES In December 2019, a novel strain of coronavirus (“COVID-19”) was reported to have surfaced in China and has since spread to a number of other countries, including the United States. In March 2020, the World Health Organization declared COVID-19 a global pandemic and the United States declared a National Public Health Emergency. The impact of the COVID-19 pandemic is fluid and continues to evolve, which is adversely affecting some of the Company’s clients. The COVID-19 pandemic and its associated impacts on trade (including supply chains and export levels), travel, employee productivity, unemployment, consumer spending, and other economic activities has resulted in less economic activity, lower equity market valuations and significant volatility and disruption in financial markets and has had an adverse effect on the Company’s business, financial condition and results of operations. The ultimate extent of the impact of the COVID-19 pandemic on the Company’s business, financial condition and results of operations is currently uncertain and will depend on various developments and other factors, including, among others, the duration and scope of the pandemic, as well as governmental, regulatory and private sector responses to the pandemic, and the associated impacts on the economy, financial markets, and our clients, employees, and vendors. The Company’s business, financial condition and results of operations generally rely upon the ability of the Company’s borrowers to repay their loans, the value of collateral underlying the Company’s secured loans, and demand for loans and other products and services the Company offers, which are highly dependent on the business environment in the Company’s primary markets where it operates and in the United States as a whole. During the current year, the Company’s results of operations were negatively impacted by full impairment of the Company's goodwill, an increase in its provision for credit losses and related allowance for credit losses, a decline in the fair value of its equity portfolio, and a decline in valuation of assets. These circumstances could cause the Company to experience a material adverse effect on our business operations, asset valuations, financial condition, results of operations and prospects. Material adverse impacts may include all or a combination of valuation impairments on the Company’s intangible assets, investments, loans, loan servicing rights, deferre d tax assets, lease right-of-use assets, or counter-party risk derivatives. Beginning in March 2020, the Company has offered three-month payment deferrals for customers with a current payment status who were negatively impacted by economic disruption caused by the COVID-19 pandemic. Through December 31, 2020, the Company had modified 5,701 loans with a carrying value of $1.5 billion. As of December 31, 2020, the Company had 746 active modified loans outstanding with a carrying value of $316.1 million, which excluded loans returning to payment or awaiting evaluation for further deferral. The Company continues to accrue interest on these loans during the deferral period. In accordance with interagency guidance issued in March 2020 and Section 4013 (Temporary Relief from Troubled Debt Restructurings) of the CARES Act, these short-term deferrals are not considered troubled debt restructurings (“TDRs”) unless the borrower was previously experiencing financial difficulty. In addition, the risk-ratings on COVID-19 modified loans did not automatically change as a result of payment deferrals, and these loans will not be considered past due until after the deferral period is over and scheduled payments resume. Credit Related Financial Instruments. The Company is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Such commitments involve, to varying degrees, elements of credit, and interest rate risk in excess of the amount recognized in the accompanying Consolidated Balance Sheets. The Company’s exposure to credit loss in the event of non-performance by the other party to the financial instrument is represented by the contractual amount of these commitments. The Company uses the same credit policies in making commitments as it does for on-balance-sheet instruments. A summary of financial instruments outstanding whose contract amounts represent credit risk is as follows at year-end: (In thousands) 2020 2019 Commitments to originate new loans (1) $ 211,485 $ 143,812 Unused funds on commercial and other lines of credit 944,678 850,761 Unadvanced funds on home equity lines of credit 371,080 384,723 Unadvanced funds on construction and real estate loans 226,736 440,599 Standby letters of credit 24,501 15,527 Total $ 1,778,480 $ 1,835,422 (1) As of December 31, 2020, there were no commitments to originate new loans related to discontinued operations. As of December 31, 2019, commitments to originate new loans include $132.7 million related to discontinued operations. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The commitments for lines of credit may expire without being drawn upon. Therefore, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These letters of credit are primarily issued to support borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company considers standby letters of credit to be guarantees and the amount of the recorded liability related to such guarantees was not material at year-end 2020 and 2019. Employment and Change in Control Agreements. The Company and the Bank have change in control agreements with several officers which provide a severance payment in the event employment is terminated in conjunction with a defined change in control. Legal Claims. Various legal claims arise from time to time in the normal course of business. As of December 31, 2020, neither the Company nor the Bank was involved in any pending legal proceedings believed by management to be material, that are not accrued for, to the Company’s financial condition or results of operations. As of December 31, 2020, the Company had litigation accrual of $110 thousand. As of December 31, 2019, the Company had litigation accrual of $2.0 million.

SHAREHOLDERS' EQUITY AND EARNIN

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE	SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE Minimum Regulatory Capital Requirements The Company and Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if imposed, could have a direct material impact on the Company’s Consolidated Financial Statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and Bank must meet specific capital guidelines that involve quantitative measures of its 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 weighting and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and Bank to maintain minimum amounts and ratios (set forth in the following table) of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of Tier 1 capital to average assets (as defined). As of year-end 2020 and 2019, the Bank and the Company met the capital adequacy requirements. Regulators may set higher expected capital requirements in some cases based on their examinations. At December 31, 2020, the capital levels of both the Company and the Bank exceeded all regulatory capital requirements and their regulatory capital ratios were above the minimum levels. The capital levels of both the Company and the Bank at December 31, 2020 also exceeded the minimum capital requirements including the currently applicable BASEL III capital conservation buffer of 1.875%. As of year-end 2020 and 2019, the Bank met the conditions to be classified as “well capitalized” under the relevant regulatory framework. To be categorized as well capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based, and Tier 1 leverage ratios as set forth in the following tables. The Company and Bank’s actual and required capital amounts were as follows: Minimum Minimum to be Well Actual (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2020 Company (Consolidated) Total capital to risk-weighted assets $ 1,337,008 16.10 % $ 664,239 8.00 % N/A N/A Common Equity Tier 1 Capital to risk weighted assets 1,145,329 13.79 373,634 4.50 N/A N/A Tier 1 capital to risk-weighted assets 1,167,512 14.06 498,179 6.00 N/A N/A Tier 1 capital to average assets 1,167,512 9.38 332,119 4.00 N/A N/A Bank Total capital to risk-weighted assets $ 1,243,287 14.99 % $ 663,429 8.00 % $ 961,659 10.00 % Common Equity Tier 1 Capital to risk weighted assets 1,148,205 13.85 373,179 4.50 625,079 6.50 Tier 1 capital to risk-weighted assets 1,148,205 13.85 497,572 6.00 769,327 8.00 Tier 1 capital to average assets 1,148,205 9.23 331,715 4.00 480,830 5.00 December 31, 2019 Company (Consolidated) Total capital to risk-weighted assets $ 1,321,910 13.73 % $ 770,294 8.00 % N/A N/A Common Equity Tier 1 Capital to risk weighted assets 1,161,800 12.07 433,290 4.50 N/A N/A Tier 1 capital to risk-weighted assets 1,183,932 12.30 577,720 6.00 N/A N/A Tier 1 capital to average assets 1,183,932 9.33 385,147 4.00 N/A N/A Bank Total capital to risk-weighted assets $ 1,233,278 12.82 % $ 769,327 8.00 % $ 961,659 10.00 % Common Equity Tier 1 Capital to risk weighted assets 1,169,535 12.16 432,747 4.50 625,079 6.50 Tier 1 capital to risk-weighted assets 1,169,535 12.16 576,996 6.00 769,327 8.00 Tier 1 capital to average assets 1,169,535 9.14 384,664 4.00 480,830 5.00 Common stock The Bank is subject to dividend restrictions imposed by various regulators, including a limitation on the total of all dividends that the Bank may pay to the Company in any calendar year. The total of all dividends shall not exceed the Bank’s net income for the current year (as defined by statute), plus the Bank’s net income retained for the two previous years, without regulatory approval. Dividends from the Bank are an important source of funds to the Company to make dividend payments on its common and preferred stock, to make payments on its borrowings, and for its other cash needs. The ability of the Company and the Bank to pay dividends is dependent on regulatory policies and regulatory capital requirements. The ability to pay such dividends in the future may be adversely affected by new legislation or regulations, or by changes in regulatory policies relating to capital, safety and soundness, and other regulatory concerns. The payment of dividends by the Company is subject to Delaware law, which generally limits dividends to an amount equal to an excess of the net assets of a company (the amount by which total assets exceed total liabilities) over statutory capital, or if there is no excess, to the Company’s net profits for the current and/or immediately preceding fiscal year. Preferred stock The Company previously issued Series B Non-Voting Preferred Stock. Each preferred share is convertible into two shares of the Company's common stock under specified conditions. The shares are considered participating, but do not maintain preferential treatment over common shares. Proportional dividends on the preferred shares are not payable unless also declared for common shares. The preferred shares were converted to common stock during 2020 and therefore there were no preferred shares issued and outstanding as of December 31, 2020. Accumulated other comprehensive income Year-end components of accumulated other comprehensive income are as follows: (In thousands) 2020 2019 Other accumulated comprehensive income/(loss), before tax: Net unrealized holding gain/(loss) on AFS securities $ 44,988 $ 19,262 Net unrealized holding (loss) on pension plans (3,511) (3,022) Income taxes related to items of accumulated other comprehensive (loss)/income: Net unrealized holding (gain)/loss on AFS securities (11,530) (5,059) Net unrealized holding loss on pension plans 924 812 Accumulated other comprehensive income $ 30,871 $ 11,993 The following table presents the components of other comprehensive (loss)/income for the years ended December 31, 2020, 2019, and 2018: (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2020 Net unrealized holding gain on AFS securities: Net unrealized gain arising during the period $ 25,721 $ (6,470) $ 19,251 Less: reclassification adjustment for (losses) realized in net income (5) 1 (4) Net unrealized holding gain on AFS securities 25,726 (6,471) 19,255 Net unrealized holding (loss) on pension plans Net unrealized (loss) arising during the period (489) 112 (377) Less: reclassification adjustment for (losses) realized in net income — — — Net unrealized holding (loss) on pension plans (489) 112 (377) Other comprehensive gain $ 25,237 $ (6,359) $ 18,878 (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2019 Net unrealized holding gain on AFS securities: Net unrealized gain arising during the period $ 34,591 $ (8,890) $ 25,701 Less: reclassification adjustment for gains realized in net income 61 (17) 44 Net unrealized holding gain on AFS securities 34,530 (8,873) 25,657 Net unrealized holding (loss) on pension plans Net unrealized (loss) arising during the period (270) 76 (194) Less: reclassification adjustment for (losses) realized in net income — — — Net unrealized holding (loss) on pension plans (270) 76 (194) Other comprehensive gain $ 34,260 $ (8,797) $ 25,463 Less: reclassification related to adoption of ASU 2016-01 — — — Less: reclassification related to adoption of ASU 2018-02 — — — Total change to accumulated other comprehensive (loss) $ 34,260 $ (8,797) $ 25,463 (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2018 Net unrealized holding (loss) on AFS securities: Net unrealized (loss) arising during the period $ (16,917) $ 4,419 $ (12,498) Less: reclassification adjustment for gains realized in net income 6 (2) 4 Net unrealized holding (loss) on AFS securities (16,923) 4,421 (12,502) Net unrealized holding (loss) on pension plans Net unrealized gain arising during the period 135 (54) 81 Less: reclassification adjustment for (losses) realized in net income (201) 54 (147) Net unrealized holding loss on pension plans 336 (108) 228 Other comprehensive (loss) $ (16,587) $ 4,313 $ (12,274) Less: reclassification related to adoption of ASU 2016-01 8,379 (2,126) 6,253 Less: reclassification related to adoption of ASU 2018-02 — (896) (896) Total change to accumulated other comprehensive (loss) $ (24,966) $ 7,335 $ (17,631) The following table presents the changes in each component of accumulated other comprehensive income/(loss), for the years ended December 31, 2020, 2019, and 2018: (in thousands) Net unrealized holding gain (loss) on AFS Securities Net unrealized holding gain (loss) on pension plans Total Year Ended December 31, 2020 Balance at Beginning of Year $ 14,204 $ (2,211) $ 11,993 Other comprehensive gain/(loss) before reclassifications 19,251 (377) 18,874 Amounts reclassified from accumulated other comprehensive income (4) — (4) Total other comprehensive income/(loss) 19,255 (377) 18,878 Balance at End of Period $ 33,459 $ (2,588) $ 30,871 Year Ended December 31, 2019 Balance at Beginning of Year $ (11,453) $ (2,017) $ (13,470) Other comprehensive gain/(loss) before reclassifications 25,701 (194) 25,507 Amounts reclassified from accumulated other comprehensive income 44 — 44 Total other comprehensive income/(loss) 25,657 (194) 25,463 Balance at End of Period $ 14,204 $ (2,211) $ 11,993 Year Ended December 31, 2018 Balance at Beginning of Year $ 6,008 $ (1,847) $ 4,161 Other comprehensive (loss)/income before reclassifications (12,498) 81 (12,417) Amounts reclassified from accumulated other comprehensive income 4 (147) (143) Total other comprehensive (loss)/income (12,502) 228 (12,274) Less: amounts reclassified from accumulated other 4,959 398 5,357 Balance at End of Period $ (11,453) $ (2,017) $ (13,470) The following table presents the amounts reclassified out of each component of accumulated other comprehensive (loss)/income for the years ended December 31, 2020, 2019, and 2018: Affected Line Item in the Years Ended December 31, (in thousands) 2020 2019 2018 Realized (losses)/gains on AFS securities: $ (5) $ 61 $ 6 Non-interest income 1 (17) (2) Tax expense (4) 44 4 Realized (losses) on pension plans — — (201) Non-interest expense — — 54 Tax expense — — (147) Total reclassifications for the period $ (4) $ 44 $ (143) (Loss)/Earnings Per Common Share Basic (loss)/earnings per common share (“EPS”) excludes dilution and is computed by dividing net income applicable to common stock by the weighted average number of common shares outstanding for the year. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options) were exercised or converted into additional common shares that would then share in the earnings of the entity. Diluted EPS is computed by dividing net income applicable to common stock by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method. (Loss)/earnings per common share has been computed based on the following (average diluted shares outstanding is calculated using the treasury stock method): Years Ended December 31, (In thousands, except per share data) 2020 2019 2018 Net (loss)/income from continuing operations $ (513,175) $ 101,521 $ 109,219 Net (loss) from discontinued operations (19,842) (4,071) (3,454) Net (loss)/income $ (533,017) $ 97,450 $ 105,765 Average number of common shares issued 51,903 49,782 46,212 Less: average number of treasury shares 1,569 1,142 810 Less: average number of unvested stock award shares 505 420 421 Plus: average participating preferred shares 441 1,043 1,043 Average number of basic common shares outstanding 50,270 49,263 46,024 Plus: dilutive effect of unvested stock award shares — 122 180 Plus: dilutive effect of stock options outstanding — 36 27 Average number of diluted common shares outstanding 50,270 49,421 46,231 Basic (loss)/earnings per share: Continuing Operations $ (10.21) $ 2.06 $ 2.38 Discontinued operations (0.39) (0.08) (0.08) Basic (loss)/earnings per common share $ (10.60) $ 1.98 $ 2.30 Diluted (loss)/earnings per share: Continuing Operations $ (10.21) $ 2.05 $ 2.36 Discontinued operations (0.39) (0.08) (0.07) Diluted (loss)/earnings per common share $ (10.60) $ 1.97 $ 2.29 Due to the net loss in 2020, all unvested restricted stock and options were considered anti-dilutive and therefore excluded from the earnings per share calculations. For the year ended 2019, 61 thousand options were anti-dilutive and therefore excluded from the earnings per share calculations. For the year ended 2018, 38 thousand options were anti-dilutive and therefore excluded from the earnings per share calculations.

STOCK-BASED COMPENSATION PLANS

STOCK-BASED COMPENSATION PLANS	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION PLANS	STOCK-BASED COMPENSATION PLANS The 2018 Equity Incentive Plan (the “2018 Plan”) permits the granting of a combination of Restricted Stock awards and incentive and non-qualified stock options (“Stock Options”) to employees and directors. A total of 1.0 million shares was authorized under the Plan. Awards may be granted as either Restricted Stock or Stock Options provided that any shares that are granted as Restricted Stock are counted against the share limit set forth as (1) three for every one share of Restricted Stock granted and (2) one for every one share of Stock Option granted. As of the 2018 Plan's effective date, all expired, canceled, and forfeited shares under the 2013 Plan are included in the 2018 Plan's available shares. As of year-end 2020, the Company had the ability to grant approximately 0.9 million shares under this plan. A summary of activity in the Company’s stock compensation plans is shown below: Non-vested Stock Stock Options Outstanding (Shares in thousands) Number of Shares Weighted- Average Number of Shares Weighted- Average Exercise Price Balance, December 31, 2019 450 $ 32.47 153 $ 22.00 Granted 314 16.69 — — Acquired — — — — Stock options exercised — — (37) 17.85 Stock awards vested (156) 33.18 — — Forfeited (91) 29.86 — — Expired — — (4) 11.99 Balance, December 31, 2020 517 $ 28.35 112 $ 22.95 Stock Awards The total compensation cost for stock awards recognized as expense was $4.7 million, $4.8 million, and $4.8 million, in the years 2020, 2019, and 2018, respectively. The total recognized tax benefit associated with this compensation cost was $1.2 million, $1.3 million, and $1.3 million, respectively. The weighted average fair value of stock awards granted was $16.69, $29.47, and $37.87 in 2020, 2019, and 2018, respectively. Stock awards vest over periods up to five years and are valued at the closing price of the stock on the grant date. Certain awards vest based on the Company's performance over established measurement periods. The total fair value of stock awards vested during 2020, 2019, and 2018 was $5.2 million, $4.8 million, and $4.8 million respectively. The unrecognized stock-based compensation expense related to unvested stock awards was $6.2 million as of year-end 2020. This amount is expected to be recognized over a weighted average period of two years. Option Awards Option awards are granted with an exercise price equal to the market price of the Company’s stock at the date of grant, and vest over periods up to five years. The options grant the holder the right to acquire a share of the Company’s common stock for each option held, and have a contractual life of ten years. As of year-end 2020, the weighted average remaining contractual term for options outstanding is three years. The Company generally issues shares from treasury stock as options are exercised. The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model. The expected dividend yield and expected term are based on management estimates. The expected volatility is based on historical volatility. The risk-free interest rates for the expected term are based on the U.S. Treasury yield curve in effect at the time of the grant. The Company did not grant options during 2020. The Company acquired options in the SI Financial Group transaction in 2019, but did not grant additional options during 2019. The Company did not grant options during 2018. The total intrinsic value of options exercised was $246 thousand, $149 thousand, and $855 thousand for the years 2020, 2019, and 2018, respectively. During 2020, the expense pertaining to options vesting was $96 thousand. During 2019, the expense pertaining to options vesting was $93 thousand. There was no expense pertaining to options vesting in 2018. The tax benefit associated with stock option expense for both 2020 and 2019 was $25 thousand. There was no tax benefit associated with stock option expense in 2018. The unrecognized stock-based compensation expense related to unvested stock options as of year-end 2020 and 2019 was $27 thousand and $124 thousand, respectively. There was no unrecognized stock-based compensation expense related to unvested stock options as of year-end 2018.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to all of the Company’s financial assets and financial liabilities that are carried at fair value, including assets classified as discontinued operations on the consolidated balance sheets. See Note 2 - Discontinued Operations for more information on assets and liabilities classified as discontinued operations. Recurring Fair Value Measurements of Financial Instruments The following table summarizes assets and liabilities measured at fair value on a recurring basis as of year-end 2020 and 2019 segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: December 31, 2020 (In thousands) Level 1 Level 2 Level 3 Total Trading security $ — $ — $ 9,708 $ 9,708 Available-for-sale securities: Municipal bonds and obligations — 97,803 — 97,803 Agency collateralized mortgage obligations — 756,826 — 756,826 Agency residential mortgage-backed securities — 438,132 — 438,132 Agency commercial mortgage-backed securities — 288,650 — 288,650 Corporate bonds — 45,030 15,000 60,030 Other bonds and obligations — 53,791 — 53,791 Marketable equity securities 17,841 672 — 18,513 Loans held for investment — — 2,265 2,265 Loans held for sale — 12,992 4,756 17,748 Derivative assets — 159,016 1,055 160,071 Capitalized servicing rights — — 3,033 3,033 Derivative liabilities — 65,758 — 65,758 December 31, 2019 (In thousands) Level 1 Level 2 Level 3 Total Trading security $ — $ — $ 10,769 $ 10,769 Available-for-sale securities: Municipal bonds and obligations — 110,138 — 110,138 Agency collateralized mortgage obligations — 748,812 — 748,812 Agency residential mortgage-backed securities — 147,744 — 147,744 Agency commercial mortgage-backed securities — 147,096 — 147,096 Corporate bonds — 73,610 42,966 116,576 Other bonds and obligations — 41,189 — 41,189 Marketable equity securities 40,499 1,057 — 41,556 Loans held for sale (1) — 140,280 — 140,280 Derivative assets (1) — 77,562 2,628 80,190 Capitalized servicing rights (1) — — 12,299 12,299 Derivative liabilities (1) 227 80,454 — 80,681 (1) Includes assets and liabilities classified as discontinued operations. During the year ended December 31, 2020, there were no transfers between Level 1, 2 and 3. During the year ended December 31, 2019, the Company had four transfers totaling $44.0 million in corporate bonds from Level 2 to Level 3 based on recent inactivity in the market related to pricing information for similar bonds. There were no transfers between Level 1, 2, and 3 during the years ended December 31, 2018. Trading Security at Fair Value. The Company holds one security designated as a trading security. It is a tax advantaged economic development bond issued to the Company by a local nonprofit which provides wellness and health programs. The determination of the fair value for this security is determined based on a discounted cash flow methodology. Certain inputs to the fair value calculation are unobservable and there is little to no market activity in the security; therefore, the security meets the definition of a Level 3 security. The discount rate used in the valuation of the security is sensitive to movements in the 3-month LIBOR rate. Securities Available for Sale and Marketable Equity Securities . Marketable equity securities classified as Level 1 consist of publicly-traded equity securities for which the fair values can be obtained through quoted market prices in active exchange markets. Marketable equity securities classified as Level 2 consist of securities with infrequent trades in active exchange markets, and pricing is primarily sourced from third party pricing services. AFS securities classified as Level 2 include most of the Company’s debt securities. The pricing on Level 2 and Level 3 was primarily sourced from third party pricing services, overseen by management, and is based on models that consider standard input factors such as dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and condition, among other things. Level 3 pricing includes inputs unobservable to market participants. Loans Held for Investment. The Company’s held for investment loan portfolio includes loans originated by Company and loans acquired through business combinations. The Company intends to hold these assets until maturity as a part of its business operations. For one acquired portfolio subset, the Company previously accounted for these purchased-credit impaired loans as a pool under ASC 310, as they were determined to have common risk characteristics. These loans were recorded at fair value on acquisition date and subsequently evaluated for impairment collectively. Upon adoption of ASC 326, the Company elected the fair value option on this portfolio, recognizing a $11.2 million fair value write-down charged to Retained Earnings, net of deferred tax impact, as of January 1, 2020. The fair value of this loan portfolio is determined based on a discounted cash flow methodology. Certain inputs to the fair value calculation are unobservable; therefore, the loans meet the definition of Level 3 assets. The discount rate used in the valuation is consistent with assets that have significant credit deterioration. The cash flow assumptions include payment schedules for loans with current payment histories and estimated collateral value for delinquent loans. All of these loans were nonperforming as of December 31, 2020. Aggregate Fair Value December 31, 2020 Aggregate Aggregate Less Aggregate (In thousands) Fair Value Unpaid Principal Unpaid Principal Loans held for investment at fair value $ 2,265 $ 53,945 $ (51,680) Loans held for sale. The Company elected the fair value option for all mortgage loans originated for sale (HFS) that were originated for sale on or after May 1, 2012. Loans HFS are classified as Level 2 as the fair value is based on input factors such as quoted prices for similar loans in active markets. Aggregate Aggregate Aggregate Fair Value December 31, 2020 (In thousands) Loans held for sale - continuing operations $ 12,992 $ 12,639 $ 353 Loans held for sale - discontinued operations — — — Loans held for sale $ 12,992 $ 12,639 $ 353 Aggregate Aggregate Aggregate Fair Value December 31, 2019 (In thousands) Loans held for sale - continuing operations $ 7,625 $ 7,485 $ 140 Loans held for sale - discontinued operations 132,655 129,622 3,033 Loans held for sale $ 140,280 $ 137,107 $ 3,173 The changes in fair value of loans held for sale for the year ended December 31, 2020 were gains of $212 thousand from continuing operations and gains of $3.0 million from discontinued operations. The changes in fair value of loans held for sale for the year ended December 31, 2019 were gains of $97 thousand from continuing operations and losses of $138 thousand from discontinued operations. During 2020, originations of loans held for sale from continuing operations totaled $150 million and sales of loans originated for sale from continuing operations totaled $141 million. During 2020, originations of loans held for sale from discontinued operations totaled $624 billion and sales of loans originated for sale from discontinued operations totaled $755 billion. During 2019, originations of loans held for sale from continuing operations totaled $67 million and sales of loans originated for sale from continuing operations totaled $62 million. During 2019, originations of loans held for sale from discontinued operations totaled $2.9 billion and sales of loans originated for sale from discontinued operations totaled $2.8 billion. Interest Rate Swaps. The valuation of the Company’s interest rate swaps is obtained from a third-party pricing service and is determined using a discounted cash flow analysis on the expected cash flows of each derivative. The pricing analysis is based on observable inputs for the contractual terms of the derivatives, including the period to maturity and interest rate curves. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s 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. 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 itself and its counterparties. However, as of year-end 2020, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. Commitments to Lend. The Company enters into commitments to lend for residential mortgage loans intended for sale, which commit the Company to lend funds to a potential borrower at a certain interest rate and within a specified period of time. The estimated fair value of commitments to originate residential mortgage loans for sale is based on quoted prices for similar loans in active markets. However, this value is adjusted by a factor which considers the likelihood that the loan commitment will ultimately close, and by the non-refundable costs of originating the loan. The closing ratio is derived from the Bank’s internal data and is adjusted using significant management judgment. The costs to originate are primarily based on the Company’s internal commission rates that are not observable. As such, these commitments to lend are classified as Level 3 measurements. Commitments to lend are included in discontinued operations. See Note 2 - Discontinued Operations for more information on assets and liabilities classified as discontinued operations. Forward Sale Commitments . The Company utilizes forward sale commitments as economic hedges against potential changes in the values of the commitments to lend and loans originated for sale. To be announced (TBA) mortgage-backed securities forward commitment sales are used as hedging instruments, are classified as Level 1, and consist of publicly-traded debt securities for which identical fair values can be obtained through quoted market prices in active exchange markets. The fair values of the Company’s best efforts and mandatory delivery loan sale commitments are determined similarly to the commitments to lend using quoted prices in the market place that are observable. However, costs to originate and closing ratios included in the calculation are internally generated and are based on management’s judgment and prior experience, which are considered factors that are not observable. As such, best efforts and mandatory forward sale commitments are classified as Level 3 measurements. Forward sale commitments are included in discontinued operations. See Note 2 - Discontinued Operations for more information on assets and liabilities classified as discontinued operations. Capitalized Servicing Rights. The Company accounts for certain capitalized servicing rights at fair value in its Consolidated Financial Statements, as the Company is permitted to elect the fair value option for each specific instrument. A loan servicing right asset represents the amount by which the present value of the estimated future net cash flows to be received from servicing loans exceed adequate compensation for performing the servicing. The fair value of servicing rights is estimated using a present value cash flow model. The most important assumptions used in the valuation model are the anticipated rate of the loan prepayments and discount rates. Although some assumptions in determining fair value are based on standards used by market participants, some are based on unobservable inputs and therefore are classified in Level 3 of the valuation hierarchy. The table below presents the changes in Level 3 assets that were measured at fair value on a recurring basis at year-end 2020 and 2019: Assets (Liabilities) (In thousands) Trading Securities Available for Sale Loans Held for Investment Commitments to Lend (1) Forward Capitalized Servicing Rights (1) Balance as of December 31, 2018 $ 11,212 $ — $ — $ 3,927 $ — $ 11,485 Unrealized (loss), net recognized in other non-interest income 258 — — — — — Unrealized gain/(loss), net recognized in discontinued — — — 55,771 — (10,322) Unrealized gain included in accumulated other comprehensive loss — (162) — — — — Transfers to Level 3 — 43,128 — — — — Paydown of trading security (701) — — — — — Transfers to loans held for sale — — — (57,070) — — Additions to servicing rights — — — — — 11,136 Balance as of December 31, 2019 $ 10,769 $ 42,966 $ — $ 2,628 $ — $ 12,299 Adoption of ASC 326 — — 7,660 — — — Maturities, calls, and prepayments of AFS Security — (30,000) — — — Unrealized (loss) gain, net recognized in other non-interest income (327) — (1,283) — — (822) Unrealized gain/(loss), net recognized in discontinued — — — 16,565 320 (8,444) Unrealized (loss) included in accumulated other comprehensive loss — 2,034 — — — — Transfers to Level 3 — — — — — — Paydown of asset (734) — (4,112) — — — Transfers to loans held for sale — — (18,458) — — Additions to servicing rights — — — — — Balance as of December 31, 2020 $ 9,708 $ 15,000 $ 2,265 $ 735 $ 320 $ 3,033 Unrealized gains/(losses) relating to instruments still held at December 31, 2020 $ 1,053 $ 287 $ — $ 735 $ 320 $ — Unrealized gains/(losses) relating to instruments still held at December 31, 2019 $ 1,379 $ (162) $ — $ 2,628 $ — $ — (1) For 2019, these assets were classified as assets from discontinued operations on the consolidated balance sheets. Quantitative information about the significant unobservable inputs within Level 3 recurring assets/(liabilities) as of December 31, 2020 and 2019 are as follows: Fair Value Significant Unobservable Input Value (In thousands) December 31, 2020 Valuation Techniques Unobservable Inputs Assets Trading Security $ 9,708 Discounted Cash Flow Discount Rate 2.72 % Securities Available for Sale 15,000 Indication from Market Maker Price 102.00 % Loans held for investment 2,265 Discounted Cash Flow Discount Rate 30.00 % Collateral Value $8.1 - $21.9 Commitments to Lend 735 Historical Trend Closing Ratio 74.54 % Pricing Model Origination Costs, per loan $ 3 Forward Commitments 320 Historical Trend Closing Ratio 74.54 % Pricing Model Origination Costs, per loan $ 3 Capitalized Servicing Rights 3,033 Discounted cash flow Constant prepayment rate (CPR) 26.52 % Discount rate 10.00 % Total $ 31,061 Fair Value Significant (In thousands) December 31, 2019 Valuation Techniques Unobservable Inputs Assets Trading Security $ 10,769 Discounted Cash Flow Discount Rate 2.21 % Securities Available for Sale 42,966 Indication from Market Maker Price 97.00% - 100.00% Commitments to Lend (1) 2,628 Historical Trend Closing Ratio 77.81 % Pricing Model Origination Costs, per loan $ 3 Capitalized Servicing Rights (1) 12,299 Discounted cash flow Constant prepayment rate (CPR) 11.50 % Discount rate 10.00 % Total $ 68,662 (1) Classified as assets from discontinued operations on the consolidated balance sheets. Non-Recurring Fair Value Measurements The Company is required, on a non-recurring basis, to adjust the carrying value or provide valuation allowances for certain assets using fair value measurements in accordance with GAAP. The following is a summary of applicable non-recurring fair value measurements. There are no liabilities measured on a non-recurring basis. December 31, 2020 Fair Value Measurements as of December 31, 2018 (In thousands) Level 3 Level 3 Assets Individually evaluated loans $ 28,028 December 2020 Capitalized servicing rights 13,315 December 2020 Other real estate owned 149 December 2020 Total $ 41,492 December 31, 2019 Fair Value Measurements as of December 31, 2017 (In thousands) Level 3 Level 3 Assets Individually evaluated loans $ 8,831 December 2019 Capitalized servicing rights 14,152 December 2019 Total $ 22,983 Quantitative information about the significant unobservable inputs within Level 3 non-recurring assets as of December 31, 2020 and 2019 are as follows: (in thousands) December 31, 2020 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets Individually evaluated loans $ 28,028 Fair value of collateral Loss severity 0.07% to 100.00% (46.36%) Appraised value $0 to $11,432 ($9,800) Capitalized servicing rights 13,315 Discounted cash flow Constant prepayment rate (CPR) 14.49% to 23.29% (16.98%) Discount rate 10.00% to 11.00% (10.56%) Other real estate owned 149 Fair value of collateral Appraised value $94 - $182 Total Assets $ 41,492 (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. (in thousands) December 31, 2019 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets Individually evaluated loans $ 8,831 Fair value of collateral Loss severity 15.72% to 0.12% (4.50%) Appraised value $8 to $1,548 ($736) Capitalized servicing rights 14,152 Discounted cash flow Constant prepayment rate (CPR) 9.44% to 14.12% (12.25%) Discount rate 10.00% to 13.50% (11.78%) Total Assets $ 22,983 (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. There were no Level 1 or Level 2 nonrecurring fair value measurements for year-end 2020 and 2019. Individually evaluated loans. Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records non-recurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Non-recurring adjustments can also include certain impairment amounts for collateral-dependent loans calculated when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace. However, the choice of observable data is subject to significant judgment, and there are often adjustments based on judgment in order to make observable data comparable and to consider the impact of time, the condition of properties, interest rates, and other market factors on current values. Additionally, commercial real estate appraisals frequently involve discounting of projected cash flows, which relies inherently on unobservable data. Therefore, real estate collateral related nonrecurring fair value measurement adjustments have generally been classified as Level 3. Estimates of fair value for other collateral that supports commercial loans are generally based on assumptions not observable in the marketplace and therefore such valuations have been classified as Level 3. Capitalized loan servicing rights . A loan servicing right asset represents the amount by which the present value of the estimated future net cash flows to be received from servicing loans exceed adequate compensation for performing the servicing. The fair value of servicing rights is estimated using a present value cash flow model. The most important assumptions used in the valuation model are the anticipated rate of the loan prepayments and discount rates. Adjustments are only recorded when the discounted cash flows derived from the valuation model are less than the carrying value of the asset. Although some assumptions in determining fair value are based on standards used by market participants, some are based on unobservable inputs and therefore are classified in Level 3 of the valuation hierarchy. Summary of Estimated Fair Values of Financial Instruments The following tables summarize the estimated fair values, which represent exit price, and related carrying amounts, of the Company’s financial instruments. Certain financial instruments and all non-financial instruments are excluded from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein may not necessarily represent the underlying fair value of the Company. Certain assets and liabilities in the following disclosures include balances classified as discontinued operations. See Note 2 - Discontinued Operations for more information on assets and liabilities classified as discontinued operations. December 31, 2020 Carrying Fair (In thousands) Level 1 Level 2 Level 3 Financial Assets Cash and cash equivalents $ 1,557,875 $ 1,557,875 $ 1,557,875 $ — $ — Trading security 9,708 9,708 — — 9,708 Marketable equity securities 18,513 18,513 17,841 672 — Securities available for sale 1,695,232 1,695,232 — 1,680,232 15,000 Securities held to maturity 465,091 491,855 — 488,393 3,462 FHLB stock and restricted equity securities 34,873 N/A N/A N/A N/A Net loans 7,954,217 8,243,437 — — 8,243,437 Loans held for sale 17,748 17,748 — 12,992 4,756 Accrued interest receivable 46,919 46,919 — 46,919 — Derivative assets 160,071 160,071 — 159,016 1,055 Assets held for sale 317,304 317,304 — 16,705 300,599 Financial Liabilities Total deposits 10,215,808 10,230,822 — 10,230,822 — Short-term debt 40,000 40,025 — 40,025 — Long-term FHLB advances 434,357 438,064 — 438,064 — Subordinated notes 97,280 95,178 — 95,178 — Derivative liabilities 65,758 65,758 — 65,758 — Liabilities held for sale 630,065 631,268 — 631,268 — December 31, 2019 Carrying Fair (In thousands) Level 1 Level 2 Level 3 Financial Assets Cash and cash equivalents $ 579,829 $ 579,829 $ 579,829 $ — $ — Trading security 10,769 10,769 — — 10,769 Marketable equity securities 41,556 41,556 40,500 1,056 — Securities available for sale 1,311,555 1,311,555 — 1,267,573 43,982 Securities held to maturity 357,979 373,277 — 355,513 17,764 FHLB stock and restricted equity securities 48,019 N/A N/A N/A N/A Net loans 9,438,853 9,653,550 — — 9,653,550 Loans held for sale (1) 169,319 169,319 — 140,280 29,039 Accrued interest receivable 36,462 36,462 — 36,462 — Derivative assets (1) 80,190 80,190 — 77,562 2,628 Financial Liabilities Total deposits 10,335,977 10,338,993 — 10,338,993 — Short-term debt 125,000 125,081 — 125,081 — Long-term FHLB advances 605,501 606,381 — 606,381 — Subordinated notes 97,049 101,055 — 101,055 — Derivative liabilities (1) 80,681 80,681 227 80,454 — (1) Includes assets and liabilities classified as discontinued operations.

CONDENSED FINANCIAL STATEMENTS

CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY	CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY Condensed financial information pertaining only to the Parent, Berkshire Hills Bancorp, is as follows. CONDENSED BALANCE SHEETS December 31, (In thousands) 2020 2019 Assets Cash due from Berkshire Bank $ 83,510 $ 74,153 Investment in subsidiaries 1,202,755 1,777,717 Marketable equity securities, at fair value 158 4,840 Other assets 188 438 Total assets $ 1,286,611 $ 1,857,148 Liabilities and Shareholders’ Equity Subordinated notes $ 97,280 $ 97,049 Accrued expenses 1,558 1,535 Shareholders’ equity 1,187,773 1,758,564 Total liabilities and shareholders’ equity $ 1,286,611 $ 1,857,148 CONDENSED STATEMENTS OF OPERATIONS Years Ended December 31, (In thousands) 2020 2019 2018 Income: Dividends from subsidiaries $ 46,300 $ 104,700 $ 48,500 Other (2,185) 1,258 506 Total income 44,115 105,958 49,006 Interest expense 5,335 5,335 5,335 Non-interest expenses 2,866 4,129 3,034 Total expense 8,201 9,464 8,369 Income before income taxes and equity in undistributed income of subsidiaries 35,914 96,494 40,637 Income tax (benefit) (2,719) (2,054) (1,068) Income before equity in undistributed income of subsidiaries 38,633 98,548 41,705 Equity in undistributed results of operations of subsidiaries (571,650) (1,098) 64,060 Net (loss)/income (533,017) 97,450 105,765 Preferred stock dividend 313 960 918 (Loss)/income available to common shareholders $ (533,330) $ 96,490 $ 104,847 Comprehensive (loss)/income $ (514,139) $ 122,912 $ 88,133 CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities: Net (loss)/income $ (533,017) $ 97,450 $ 105,765 Adjustments to reconcile net income to net cash (used) provided by operating activities: Equity in undistributed results of operations of subsidiaries 571,650 1,098 (64,060) Other, net 2,603 (4,457) 20,916 Net cash provided by operating activities 41,236 94,091 62,621 Cash flows from investing activities: Advances to subsidiaries — — (85,000) Purchase of securities (489) — (128) Sale of securities 4,658 6,989 13,550 Other, net — 987 — Net cash provided/(used) by investing activities 4,169 7,976 (71,578) Cash flows from financing activities: Proceed from issuance of short term debt 231 431 178 Proceed from repayment of long term debt — — 35,000 Net proceeds from common stock — — 325 Payment to repurchase common stock (473) (52,746) — Common stock cash dividends paid (36,251) (44,147) (39,966) Preferred stock cash dividends paid (313) (960) (918) Other, net 758 188 278 Net cash (used) in financing activities (36,048) (97,234) (5,103) Net change in cash and cash equivalents 9,357 4,833 (14,060) Cash and cash equivalents at beginning of year 74,153 69,320 83,380 Cash and cash equivalents at end of year $ 83,510 $ 74,153 $ 69,320

QUARTERLY DATA (UNAUDITED)

QUARTERLY DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY DATA (UNAUDITED)	QUARTERLY DATA (UNAUDITED) Quarterly results of operations were as follows: 2020 2019 (In thousands, except per share data) Fourth Quarter Third Quarter Second Quarter First Quarter Fourth Quarter Third Quarter Second Quarter First Quarter Interest and dividend income $ 92,131 $ 97,768 $ 103,688 $ 116,195 $ 125,441 $ 133,725 $ 129,238 $ 121,109 Interest expense 16,422 20,713 26,098 29,767 34,108 36,854 37,643 35,650 Net interest income 75,709 77,055 77,590 86,428 91,333 96,871 91,595 85,459 Non-interest income 23,327 19,963 17,381 5,636 23,362 21,406 17,512 21,722 Total revenue 99,036 97,018 94,971 92,064 114,695 118,277 109,107 107,181 Provision for loan losses 10,000 1,200 29,871 34,807 5,351 22,600 3,467 4,001 Non-interest expense 71,796 72,843 624,275 71,325 70,287 71,011 76,568 71,991 Income/(loss) from continuing operations before income taxes 17,240 22,975 (559,175) (14,068) 39,057 24,666 29,072 31,189 Income tax (benefit)/expense (1,659) (68) (16,130) (1,996) 6,421 4,007 5,118 6,917 Net income/(loss) from continuing operations 18,899 23,043 (543,045) (12,072) 32,636 20,659 23,954 24,272 (Loss)/income from discontinued operations, net of tax (3,890) (1,818) (6,336) (7,798) (6,885) 1,957 1,494 (637) Net income/(loss) $ 15,009 $ 21,225 $ (549,381) $ (19,870) $ 25,751 $ 22,616 $ 25,448 $ 23,635 Basic earnings/(loss) per share: Continuing operations $ 0.38 $ 0.46 $ (10.80) $ (0.24) $ 0.65 $ 0.40 $ 0.49 $ 0.52 Discontinued operations (0.08) (0.04) (0.13) (0.16) (0.14) 0.04 0.03 (0.01) Basic earnings/(loss) per common share $ 0.30 $ 0.42 $ (10.93) $ (0.40) $ 0.51 $ 0.44 $ 0.52 $ 0.51 Diluted earnings/(loss) per share: Continuing operations $ 0.38 $ 0.46 $ (10.80) $ (0.24) $ 0.65 $ 0.40 $ 0.49 $ 0.52 Discontinued operations (0.08) (0.04) (0.13) (0.16) (0.14) 0.04 0.03 (0.01) Diluted earnings/(loss) per share $ 0.30 $ 0.42 $ (10.93) $ (0.40) $ 0.51 $ 0.44 $ 0.52 $ 0.51 Weighted average common shares outstanding: Basic 50,308 50,329 50,246 50,204 50,494 51,422 48,961 46,113 Diluted 50,355 50,329 50,246 50,204 50,702 51,545 49,114 46,261

NET INTEREST INCOME AFTER PROVI

NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	12 Months Ended
	Dec. 31, 2020
Banking and Thrift, Interest [Abstract]
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES Presented below is net interest income after provision for credit losses for the three years ended 2020, 2019, and 2018, respectively: Years Ended December 31, (In thousands) 2020 2019 2018 Net interest income $ 316,782 $ 365,258 $ 356,200 Provision for credit losses 75,878 35,419 25,451 Net interest income after provision for credit losses 240,904 329,839 330,749 Total non-interest income 66,307 84,002 74,324 Total non-interest expense 840,239 289,857 266,893 (Loss)/income from continuing operations before income taxes (533,028) 123,984 138,180 Income tax (benefit)/expense (19,853) 22,463 28,961 Net (loss)/income from continuing operations (513,175) 101,521 109,219 (Loss) from discontinued operations before income taxes (26,855) (5,539) (4,767) Income tax (benefit) (7,013) (1,468) (1,313) Net (loss) from discontinued operations (19,842) (4,071) (3,454) Net (loss)/income $ (533,017) $ 97,450 $ 105,765

REVENUE

REVENUE	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Revenue from contracts with customers in the scope of Topic 606 is recognized within noninterest income. The Company does not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation. The value of unsatisfied performance obligations for contracts with an original expected length of one year or less are not disclosed. The Company recognizes incremental costs of obtaining contracts as an expense when incurred for contracts with a term of one year or less. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain non-interest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of Topic 606. Topic 606 is applicable to non-interest revenue streams such as wealth management fees, insurance commissions and fees, administrative services for customer deposit accounts, interchange fees, and sale of owned real estate properties. The following presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the years ended 2020, 2019, and 2018, respectively. Years Ended December 31, (In thousands) 2020 2019 2018 Non-interest income In-scope of Topic 606: Service charges on deposit accounts $ 19,239 $ 23,122 $ 21,046 Insurance commissions and fees 10,770 10,957 10,983 Wealth management fees 9,285 9,353 9,447 Interchange income 7,559 6,266 7,177 Non-interest income (in-scope of Topic 606) $ 46,853 $ 49,698 $ 48,653 Non-interest income (out-of-scope of Topic 606) 19,454 34,304 25,671 Total non-interest income from continuing operations $ 66,307 $ 84,002 $ 74,324 Non-interest income streams in-scope of Topic 606 are discussed below. Service Charges on Deposit Accounts. Service charges on deposit accounts consist of monthly service fees (i.e. business analysis fees and consumer service charges) and other deposit account related fees. The Company's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Company's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. The Company may, from time to time, waive certain fees (e.g., NSF fee) for customers but generally do not reduce the transaction price to reflect variability for future reversals due to the insignificance of the amounts. Waiver of fees reduces the revenue in the period the waiver is granted to the customer. Insurance Commissions and Fees. Commission revenue is recognized as of the effective date of the insurance policy or the date the customer is billed, whichever is later, net of return commissions related to policy cancellations. Policy cancellation is a variable consideration that is not deemed significant and thus, does not impact the amount of revenue recognized. In addition, the Company may receive additional performance commissions based on achieving certain sales and loss experience measures. Such commissions are recognized when determinable, which is generally when such commissions are received or when the Company receives data from the insurance companies that allows the reasonable estimation of these amounts. Wealth Management Fees. Wealth management fees are primarily comprised of fees earned from consultative investment management, trust administration, tax return preparation, and financial planning. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based on the daily accrual of the market value of the investment accounts and the applicable fee rate. Interchange Fees. Interchange fees are transaction fees paid to the card-issuing bank to cover handling costs, fraud and bad debt costs, and the risk involved in approving the payment. Due to the day-to-day nature of these fees they are settled on a daily basis and are accounted for as they are received. Gains/Losses on Sales of OREO. The sale of OREO and other nonfinancial assets are accounted for with the derecognition of the asset in question once a contract exists and control of the asset has been transferred to the buyer. The gain or loss on the sale is calculated as the difference between the carrying value of the asset and the transaction price.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICES (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The Consolidated Financial Statements (the “financial statements”) of Berkshire Hills Bancorp, Inc. and its subsidiaries (the “Company” or “Berkshire”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The Company is a Delaware corporation, headquartered in Boston, Massachusetts, and the holding company for Berkshire Bank (the “Bank”), a Massachusetts-chartered trust company headquartered in Pittsfield, Massachusetts, and Berkshire Insurance Group, Inc. These financial statements include the accounts of the Company, its wholly-owned subsidiaries and the Bank’s consolidated subsidiaries. In consolidation, all significant intercompany accounts and transactions are eliminated. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly-owned and majority-owned subsidiaries are consolidated unless GAAP requires otherwise. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date these financial statements were issued.
Reclassifications	Reclassifications Certain items in prior financial statements have been reclassified to conform to the current presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements. Actual results could differ from those estimates. Refer to Note 17 – Other Commitments, Contingencies, and Off-Balance Sheet Activities for pandemic related risks and uncertainties.
Business Combinations	Business Combinations Business combinations are accounted for using the acquisition method of accounting. Under this method, the accounts of an acquired entity are included with the acquirer’s accounts as of the date of acquisition with any excess of purchase price over the fair value of the net assets acquired (including identifiable intangibles) capitalized as goodwill. To consummate an acquisition, the Company will typically issue common stock and/or pay cash, depending on the terms of the acquisition agreement. The value of common shares issued is determined based upon the market price of the stock as of the closing of the acquisition.
Cash and Cash equivalents	Cash and Cash equivalents Cash and cash equivalents include cash, balances due from banks, and short-term investments, all of which had an original maturity within 90 days. Due to the nature of cash and cash equivalents and the near term maturity, the Company estimated that the carrying amount of such instruments approximated fair value. The nature of the Bank’s business requires that it maintain amounts due from banks which at times, may exceed federally insured limits. The Bank has not experienced any losses on such amounts and all amounts are maintained with well-capitalized institutions.
Trading Security	Trading Security The Company accounts for a tax advantaged economic development bond originated in 2008 at fair value, in accordance with Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) 320. The bond has been designated as a trading account security and is recorded at fair value, with changes in unrealized gains and losses recorded through earnings each period as part of non-interest income.
Securities	Securities Debt securities that management has the intent and ability to hold to maturity are classified as held to maturity and carried at amortized cost. All other debt securities are classified as available for sale and carried at fair value, with unrealized gains and losses reported as a component of other net comprehensive income. Equity securities are carried at fair value, with changes in fair value reported in net income. Management determines the appropriate classification of securities at the time of purchase. Restricted equity securities, such as stock in the Federal Home Loan Bank of Boston (“FHLBB”) are carried at cost. There are no quoted market prices for the Company’s restricted equity securities. The Bank is a member of the FHLBB, which requires that members maintain an investment in FHLBB stock, which may be redeemed based on certain conditions. The Bank reviews for impairment based on the ultimate recoverability of the cost bases in the FHLBB stock. Purchase premiums and discounts are recognized in interest income using the interest method, without anticipating prepayments, except mortgage-backed securities where prepayments are anticipated, over the terms of the securities. Premiums on callable debt securities are amortized to their earliest call date. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. The Company measures expected credit losses on held to maturity debt securities on a collective basis. Accrued interest receivable on held to maturity debt securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts.
Loans Held for Sale	Loans Held for Sale Loans originated with the intent to be sold in the secondary market are accounted for under the fair value option. Non-refundable fees and direct loan origination costs related to residential mortgage loans held for sale are recognized in non-interest income or non-interest expense as earned or incurred. Fair value is primarily determined based on quoted prices for similar loans in active markets. Gains and losses on sales of residential mortgage loans (sales proceeds minus carrying value) are recorded in non-interest income. Loans that were previously held for investment that the Company has an active plan to sell are transferred to loans held for sale at the lower of cost or market (fair value). The market price is primarily determined based on quoted prices for similar loans in active markets or agreed upon sales prices. Gains are recorded in non-interest income at sale to the extent that the sale price of the loan exceeds carrying value. Any reduction in the loan’s value, prior to being transferred to loans held for sale, is reflected as a charge-off of the recorded investment in the loan resulting in a new cost basis, with a corresponding reduction in the allowance for loan losses. Further decreases in the fair value of the loan are recognized in non-interest expense.
Loans	Loans Loans are reported at their amortized cost. Amortized cost is the principal balance outstanding, net of the unamortized balance of any deferred fees or costs and the unamortized balance of any premiums or discounts on loans purchased or acquired through mergers. Interest income is accrued on the unpaid principal balance. Interest income includes net accretion or amortization of deferred fees or costs and of premiums or discounts. Direct loan origination costs, net of any origination fees, in addition to premiums and discounts on loans, are deferred and recognized as an adjustment of the related loan yield using the interest method. Interest on loans, excluding automobile loans, is generally not accrued on loans which are ninety days or more past due unless the loan is well-secured and in the process of collection. Past due status is based on contractual terms of the loan. Automobile loans generally continue accruing until one hundred and twenty days delinquent, at which time they are charged off. All interest accrued but not collected for loans that are placed on non-accrual or charged-off is reversed against interest income, except for certain loans designated as well-secured. The interest on non-accrual loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Purchase Credit Deteriorated Loans	Purchase Credit Deteriorated (PCD) LoansLoans that the Company acquired in acquisitions include some loans that have experienced more than insignificant credit deterioration since origination. PCD loans are recorded at the amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision expense
Allowance for loan losses	Allowance for Credit Losses for Loans The allowance for credit losses for loans (“ACLL”) is comprised of the allowance for loan losses and the allowance for unfunded commitments which is accounted for as a separate liability in other liabilities on the consolidated balance sheet. The ACLL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Accrued interest receivable is excluded from the estimate of credit losses. The level of the ACLL represents management’s estimate of expected credit losses over the expected life of the loans at the balance sheet date. The Company uses a static pool migration analysis method, applying expected historical loss trend and observed economic metrics. The level of the ACLL is based on management’s ongoing review of all relevant information, from internal and external sources, relating to past and current events, utilizing a 7 quarter reasonable and supportable forecast period with a 1 year reversion period. The ACLL reserve is overlaid with qualitative factors based upon: • the existence and growth of concentrations of credit; • the volume and severity of past due financial assets, including nonaccrual assets; • the institutions lending and credit review as well as the experience and ability of relevant management and staff and; • the effect of other external factors such as regulatory, competition, regional market conditions, legal and technological environment and other events such as natural disasters; • the effect of other economic factors such as economic stimulus and customer forbearance programs. The allowance for unfunded commitments is maintained at a level by the Company to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). The ACLL is measured on a collective (pool) basis when similar risk characteristics exist. The Company evaluates its risk characteristics of loans based on regulatory call report code with sub-segmentation based on underlying collateral for certain loan types. Risk characteristics relevant to each portfolio segment are as follows: Construction – Loans in this segment primarily include real estate development loans for which payment is derived from sale of the property or long term financing at completion. Credit risk is affected by cost overruns, time to sell at an adequate price, and market conditions. Commercial real estate multifamily, owner occupied and non-owner – Loans in this segment are primarily owner-occupied or income-producing properties throughout New England and Northeastern New York. The underlying cash flows generated by the properties are adversely impacted by a downturn in the economy, which in turn, will have an effect on the credit quality in this segment. Management monitors the cash flows of these loans. Commercial and industrial loans – Loans in this segment are made to businesses and are generally secured by assets of the business such as accounts receivable, inventory, marketable securities, other liquid collateral, equipment and other business assets. Repayment is expected from the cash flows of the business. Loans in this segment include asset based loans which generally have no scheduled repayment which are closely monitored against formula based collateral advance ratios. A weakened economy, and resultant decreased consumer spending, will have an effect on the credit quality of this segment. Residential real estate – All loans in this segment are collateralized by residential real estate and repayment is dependent on the credit quality of the individual borrower. The overall health of the economy, including unemployment rates and housing prices, will have an effect on the credit quality in this segment. Home equity and other consumer loans – Loans in this segment are primarily home equity lines of credit, automobile loans and other consumer loans. The overall health of the economy, including unemployment rates and housing prices, will have an effect on the credit quality in this segment. Loans that do not share risk characteristics are evaluated on an individual basis, which the Company has determined to be non-accrual loans over a threshold, loans that were determined to be Troubled Debt Restructurings (“TDRs”) and PCD loans. Loans evaluated individually are not also included in the collective evaluation. Estimates of specific allowance may be determined by the present value of anticipated future cash flows or the loan’s observable fair market value, or the fair value of the collateral less costs to sell, if the loan is collateral dependent. However, for collateral dependent loans, the amount of the amortized cost in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible.
Bank-Owned Life Insurance	Bank-Owned Life Insurance Bank-owned life insurance policies are reflected on the Consolidated Balance Sheets at the amount that can be realized under the insurance contract at the balance sheet date which is the cash surrender value. Changes in the net cash surrender value of the policies, as well as insurance proceeds received, are reflected in non-interest income on the Consolidated Statements of Operations and are not subject to income taxes.
Foreclosed and Repossessed Assets	Foreclosed and Repossessed Assets Other real estate owned is comprised of real estate acquired through foreclosure proceedings or acceptance of a deed in lieu of foreclosure. Repossessed collateral is primarily comprised of taxi medallions. Both other real estate owned and repossessed collateral are held for sale and are initially recorded at the fair value less estimated costs to sell at the date of foreclosure or repossession, establishing a new cost basis. The shortfall, if any, of the loan balance over the fair value of the property or collateral (excluding taxi medallions), less cost to sell, at the time of transfer from loans to other real estate owned or repossessed collateral is charged to the allowance for loan losses. Subsequent to transfer, the asset is carried at lower of cost or fair value less cost to sell and periodically evaluated for impairment. The shortfall, if any, of the loan balance over the fair value of the collateral comprised of taxi medallions at the time of transfer from loans to repossessed collateral is charged to non-interest income. Subsequent impairments in the fair value of other real estate owned and repossessed collateral are charged to expense in the period incurred. Net operating income or expense related to other real estate owned and repossessed collateral is included in operating expenses in the accompanying Consolidated Statements of Operations. Because of changing market conditions, there are inherent uncertainties in the assumptions with respect to the estimated fair value of other real estate owned and repossessed collateral. Because of these inherent uncertainties, the amount ultimately
Capitalized Servicing Rights	Capitalized Servicing Rights Capitalized servicing rights are included in “other assets” in the Consolidated Balance Sheets. Servicing assets are initially recognized as separate assets at fair value when rights are acquired through purchase or through sale of financial assets with servicing retained. The Company's servicing rights accounted for under the fair value method are carried on the Consolidated Balance Sheets at fair value with changes in fair value recorded in income in the period in which the change occurs. Changes in the fair value of servicing rights are primarily due to changes in valuation assumptions, such as discount rates and prepayment speeds, and the collection and realization of expected cash flows. The Company’s servicing rights accounted for under the amortization method are initially recorded at fair value. Under that method, capitalized servicing rights are charged to expense in proportion to and over the period of estimated net servicing income. Fair value of the servicing rights 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, prepayment speeds and default rates and losses. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranches. If the Company later determines that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the allowance may be recorded as an increase to income.
Premises and Equipment	Premises and Equipment Land is carried at cost. Buildings, improvements, and equipment are carried at cost less accumulated depreciation and amortization computed on the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on the straight-line method over the shorter of the lease term, plus optional terms if certain conditions are met, or the estimated useful life of the asset.
Goodwill	GoodwillGoodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Goodwill is assessed annually for impairment, and more frequently if events or changes in circumstances indicate that there may be an impairment. Adverse changes in the economic environment, declining operations, unanticipated competition, loss of key personnel, or other factors could result in a decline in the implied fair value of goodwill. Subsequent reversals of goodwill impairment are prohibited.
Other Intangibles	Other Intangibles Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset or liability. The fair values of these assets are generally determined based on appraisals and are subsequently amortized on a straight-line basis or an accelerated basis over their estimated lives. Management assesses the recoverability of these intangible assets at least annually or whenever events or changes in circumstances indicate that their carrying value may not be recoverable. If the carrying amount exceeds fair value, an impairment charge is recorded to income.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of an entire financial asset, group of entire financial assets, or a participating interest in an entire financial asset 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 to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets.
Income Taxes	Income Taxes Deferred income taxes are recognized for the tax consequences of temporary differences by applying enacted statutory tax rates applicable for future years to differences between financial statement and tax bases of existing assets and liabilities. The effect of tax rate changes on deferred taxes is recognized in the income tax provision in the period that includes the enactment date. A tax valuation allowance is established, as needed, to reduce net deferred tax assets to the amount expected to be realized. In the event it becomes more likely than not that some or all of the deferred tax asset allowances will not be needed, the valuation allowance will be adjusted. In the ordinary course of business there is inherent uncertainty in quantifying the Company’s income tax
Insurance Commissions	Insurance Commissions Commission revenue is recognized as of the effective date of the insurance policy or the date the customer is billed, whichever is later, net of return commissions related to policy cancellations. Policy cancellation is a variable consideration that is not deemed significant and thus, does not impact the amount of revenue recognized. In addition, the Company may receive additional performance commissions based on achieving certain sales and loss experience measures. Such commissions are recognized when determinable, which is generally when such commissions are received or when the Company receives data from the insurance companies that allows the reasonable estimation of these amounts. Revenue from contracts with customers in the scope of Topic 606 is recognized within noninterest income. The Company does not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation. The value of unsatisfied performance obligations for contracts with an original expected length of one year or less are not disclosed. The Company recognizes incremental costs of obtaining contracts as an expense when incurred for contracts with a term of one year or less. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain non-interest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of Topic 606. Topic 606 is applicable to non-interest revenue streams such as wealth management fees, insurance commissions and fees, administrative services for customer deposit accounts, interchange fees, and sale of owned real estate properties. The following presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the years ended 2020, 2019, and 2018, respectively.
Stock-Based Compensation	Stock-Based Compensation The Company measures and recognizes compensation cost relating to share-based payment transactions based on the grant-date fair value of the equity instruments issued. The fair value of restricted stock is recorded as unearned compensation. The deferred expense is amortized to compensation expense based on one of several permitted attribution methods over the longer of the required service period or performance period. For performance-based restricted stock awards, the Company estimates the degree to which performance conditions will be met to determine the number of shares that will vest and the related compensation expense. Compensation expense is adjusted in the period such estimates change. Income tax benefits and/or tax deficiencies related to stock compensation determined as the difference between compensation cost recognized for financial reporting purposes and the deduction for tax, are recognized in the income statement as income tax expense or benefit in the period in which they occur.
Wealth Management	Wealth Management Wealth management assets held in a fiduciary or agent capacity are not included in the accompanying Consolidated Balance Sheets because they are not assets of the Company. Wealth management fees is primarily comprised of fees earned from consultative investment management, trust administration, tax return preparation, and financial planning. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based on the daily accrual of the market value of the investment accounts and the applicable fee rate.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company enters into interest rate swap agreements as part of the Company’s interest rate risk management strategy for certain assets and liabilities and not for speculative purposes. Based on the Company’s intended use for the interest rate swap at inception, the Company designates the derivative as either an economic hedge of an asset or liability or a hedging instrument subject to the hedge accounting provisions of ASC 815, “Derivatives and Hedging.” Interest rate swaps designated as economic hedges are recorded at fair value within other assets or liabilities. Changes in the fair value of these derivatives are recorded directly through earnings. For interest rate swaps that management intends to apply the hedge accounting provisions of ASC 815, the Company formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. Additionally, the Company uses dollar offset or regression analysis at the hedge’s inception and for each reporting period thereafter, to assess whether the derivative used in its hedging transaction is expected to be and has been highly effective in offsetting changes in the fair value or cash flows of the hedged item. The Company discontinues hedge accounting when it is determined that a derivative is not expected to be or has ceased to be highly effective as a hedge, and then reflects changes in fair value of the derivative in earnings after termination of the hedge relationship. The Company has characterized its interest rate swaps that qualify under ASC 815 hedge accounting as cash flow hedges. Cash flow hedges are used to minimize the variability in cash flows of assets or liabilities, or forecasted transactions caused by interest rate fluctuations, and are recorded at fair value in other assets or liabilities within the Company’s balance sheets. Changes in the fair value of these cash flow hedges are initially recorded in accumulated other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. Any hedge ineffectiveness assessed as part of the Company’s quarterly analysis is recorded directly to earnings. The Company enters into commitments to lend with borrowers, and forward commitments to sell loans or to-be-announced mortgage-backed bonds to investors to hedge against the inherent interest rate and pricing risk associated with selling loans. The commitments to lend generally terminate once the loan is funded, the lock period expires or the borrower decides not to contract for the loan. The forward commitments generally terminate once the loan is sold, the commitment period expires or the borrower decides not to contract for the loan. These commitments are considered derivatives which are accounted for by recognizing their estimated fair value on the Consolidated Balance Sheets as either a freestanding asset or liability. See Note 15 - Derivative Instruments and Hedging Activities to the financial statements for more information on commitments to lend and forward commitments.
Off-Balance Sheet Financial Instruments	Off-Balance Sheet Financial Instruments In the ordinary course of business, the Company enters into off-balance sheet financial instruments, consisting primarily of credit related financial instruments. These financial instruments are recorded in the financial statements when they are funded or related fees are incurred or received.
Fair Value Hierarchy	Fair Value Hierarchy The Company groups assets and liabilities that are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. Level 1 - Valuation is based on quoted prices in active markets for identical assets or liabilities. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2 - Valuation is based on observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using unobservable techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.
Employee Benefits	Employee Benefits The Company maintains an employer sponsored 401(k) plan to which participants may make contributions in the form of salary deferrals and the Company provides matching contributions in accordance with the terms of the plan. Contributions due under the terms of the defined contribution plans are accrued as earned by employees. Due to the Rome Bancorp acquisition in 2011, the Company inherited a noncontributory, qualified, defined benefit pension plan for certain employees who met age and service requirements; as well as other post-retirement benefits, principally health care and group life insurance. The Rome pension plan and postretirement benefits that were acquired in connection with the whole-bank acquisition were frozen prior to the close of the transaction. The pension benefit in the form of a life annuity is based on the employee’s combined years of service, age, and compensation. The Company also has a long-term care post-retirement benefit plan for certain executives where upon disability, associated benefits are funded by insurance policies or paid directly by the Company. In order to measure the expense associated with the Plans, various assumptions are made including the discount rate, expected return on plan assets, anticipated mortality rates, and expected future healthcare costs. The assumptions are based on historical experience as well as current facts and circumstances. The Company uses a December 31 measurement date for its plans. As of the measurement date, plan assets are determined based on fair value, generally representing observable market prices. The projected benefit obligation is primarily determined based on the present value of projected benefit distributions at an assumed discount rate. Net periodic pension benefit costs include interest costs based on an assumed discount rate, the expected return on plan assets based on actuarially derived market-related values, and the amortization of net actuarial losses. Net periodic postretirement benefit costs include service costs, interest costs based on an assumed discount rate, and the amortization of prior service credits and net actuarial gains. Differences between expected and actual results in each year are included in the net actuarial gain or loss amount, which is recognized in other comprehensive income. The net actuarial gain or loss in excess of a 10% corridor is amortized in net periodic benefit cost over the average remaining service period of active participants in the Plans. The prior service credit is amortized over the average remaining service period to full eligibility for participating employees expected to receive benefits. The Company recognizes in its statement of condition an asset for a plan’s overfunded status or a liability for a plan’s underfunded status. The Company also measures the Plans’ assets and obligations that determine its funded status as of the end of the fiscal year and recognizes those changes in other comprehensive income, net of tax.
Operating Segments	Operating Segments The Company operates as one consolidated reportable segment. The chief operating decision-maker evaluates consolidated results and makes decisions for resource allocation on this same data. Management periodically reviews and redefines its segment reporting as internal reporting practices evolve and components of the business change. The financial statements reflect the financial results of the Company's one reportable operating segment.
Recently Adopted Accounting Principles and Future Application of Accounting Pronouncements	Recently Adopted Accounting Principles In January 2017, the FASB issued ASU No. 2017-04, “Intangibles: Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The ASU simplifies the test for goodwill impairment by eliminating the second step of the current two-step method. Under the new accounting guidance, entities will compare the fair value of a reporting unit with its carrying amount. If the carrying amount exceeds the reporting unit’s fair value, the entity is required to recognize an impairment charge for this amount. Current guidance requires an entity to proceed to a second step, whereby the entity would determine the fair value of its assets and liabilities. The new method applies to all reporting units. The performance of a qualitative assessment is still allowable. This accounting guidance is effective prospectively for interim and annual reporting periods beginning after December 15, 2019. The adoption of ASU No. 2017-04 did not impact the Company's Consolidated Financial Statements. In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds, and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Entities are also allowed to elect early adoption for the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it did not have a material impact on the Company’s Consolidated Financial Statements. In August 2018, the FASB issued ASU No. 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” ASU No. 2018-15 clarifies certain aspects of ASU No. 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement,” which was issued in April 2015. Specifically, ASU No. 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU No. 2018-15 does not affect the accounting for the service element of a hosting arrangement that is a service contract. ASU No. 2018-15 is effective for interim and annual reporting periods beginning after December 15, 2019. The adoption did not have a material impact on the Company's Consolidated Financial Statements. In June 2016, the FASB issued ASU No. 2016-13 “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” and related subsequent amendments, which replaces the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected losses under the CECL methodology is applicable to financial assets measured at amortized cost, as well as unfunded commitments that are considered off-balance sheet credit exposures at the reporting date. The measurement is based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to enhance their credit loss estimates. The update requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. For available for sale debt securities with unrealized losses, Topic 326 requires credit losses to be recognized as an allowance rather than a reduction in the amortized cost of the securities. As a result, improvements to estimated credit losses are recognized immediately in earnings rather than as interest income over time. The current expected credit loss measurement will be used to estimate the allowance for credit losses (“ACL”) over the life of the financial assets. The amendments in this update became effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. As previously disclosed, the Company assembled a cross-functional working group that met regularly to oversee the implementation plan which included assessment and documentation of processes and internal controls, model development and documentation, assessing existing loan and loss data, assessing models for default and loss estimates, and conducting parallel runs and reviews through December 31, 2019. Under CECL the Company determines its allowance for credit losses on loans using pools of assets with similar risk characteristics. The Company evaluates its risk characteristics of loans based on regulatory call report code with sub-segmentation based on underlying collateral for certain loan types. Loans that no longer match the risk profile of the pool are individually assessed for credit losses. The Company’s lifetime credit loss models are based on historical data and incorporate forecasts of macroeconomic variables, expected prepayments and recoveries. Enhancements were made in the third quarter of 2020 to the Company’s economic adjustment calculation. The Company implemented segment-level loss calculations based on the equation of the fit line which replaced the previous calculation using a range. This allows the model to calculate a specific point estimate for the loss rate as compared to using a mid-point of a range. Additionally, the Company utilized actual loan runoff by segment whereas previously a calculation was utilized for the weighted average life period. The enhancements to the economic adjustment calculation were accounted for as a change in estimate and were not considered material to the overall calculation. Outside of the model, non-economic qualitative factors are applied to further refine the expected loss calculation for each portfolio. A seven quarter reasonable and supportable forecast period with a 1 year reversion period is currently used for all loan portfolios. When the risk characteristics of a loan no longer match the characteristics of the collective pool, the loan is removed from the pool and individually assessed for credit losses. Generally, non-accrual loans above a threshold deemed appropriate by management, TDRs, potential TDRs, and collateral dependent loans are individually assessed. The individual assessment for credit impairment is generally based on a discounted cash flow approach unless the asset is collateral dependent. A loan is considered collateral dependent when repayment is expected to be provided substantially through the operation or sale of the collateral and the borrower is experiencing financial difficulty. Collateral dependent loans are individually assessed and the expected credit loss is based on the fair value of the collateral. The fair value is reduced for estimated costs to sell if the value of the collateral is expected to be realized through sale. The Company has elected to present accrued interest receivable separately from the amortized cost basis on the balance sheet and is not currently estimating an allowance for credit loss on accrued interest. This election applies to loans as well as debt securities. The Company's non-accrual policies have not changed as a result of adopting CECL. The Company adopted CECL on January 1, 2020 using the modified retrospective method for all financial assets measured at amortized cost and off-balance-sheet credit exposures. Results for the reporting periods after January 1, 2020 are presented under Topic 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. On the adoption date, the Company increased the allowance for credit losses for loans by $25.4 million and increased the allowance for credit losses for unfunded loan commitments by $8.0 million (in other liabilities). The increase related to the Company's acquired loan portfolio totaled $15.3 million. Under the previously applicable accounting guidance, any remaining unamortized loan discount on an individual loan could be used to offset a charge-off for that loan, so the allowance for loan losses needed for the acquired loans was reduced by the remaining loan discounts. The new ASU removes the ability to offset a charge-off against the remaining loan discount and requires an allowance for credit losses to be recognized in addition to the loan discount. The impact of adopting the ASU, and at each subsequent reporting period, is highly dependent on credit quality, macroeconomic forecasts and conditions, composition of our loans and available-for-sale securities portfolio, along with other management judgments. The FASB provided transition relief, allowing entities to irrevocably elect, upon adoption of CECL, the fair value option (FVO) on financial instruments that were previously recorded at amortized cost and are within the scope of ASC 326-20 if the instruments are eligible for the FVO under ASC 825-10. It is applied through a cumulative-effect adjustment to retained earnings. The Company elected the FVO for the taxi medallion portfolio resulting in a $15.3 million reduction in loan valuation. As of January 1, 2020, the Company recorded a cumulative-effect adjustment of $24.4 million decrease in retained earnings, net of deferred tax balances of $9.0 million. The Company recorded an allowance for credit losses as of January 1, 2020 on its securities held to maturity of $0.3 million. The Company adopted CECL using the prospective transition approach for financial assets purchased with credit deterioration (“PCD”) that were previously classified as purchased credit impaired and accounted for under ASC 310-30. In accordance with the standard, Berkshire did not reassess whether PCI assets met the definition of PCD assets as of the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets were adjusted to reflect the addition of $15.3 million to the allowance for credit losses for loans which is net of $11.9 million adjustment for confirmed losses. The remaining noncredit discount in the amount of $3.2 million will be accreted into interest income at the effective interest rate as of January 1, 2020. The impact of the January 1, 2020, adoption entry is summarized in the table below: (in thousands) December 31, 2019 Pre-ASC 326 Adoption Impact of Adoption January 1, 2020 Post-ASC 326 Adoption Assets: Loans 9,502,428 — 9,502,428 PCD gross up — 15,326 15,326 Fair value option — (15,291) (15,291) Total loans 9,502,428 35 9,502,463 Allowance for credit losses on loans 63,575 25,434 89,009 Allowance for credit losses on securities — 309 309 Deferred tax assets, net 51,165 8,993 60,158 Liabilities and shareholders' equity: Other liabilities (ACL unfunded loan commitments) 100 7,993 8,093 Retained earnings 361,082 (24,380) 336,702 In December 2018, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC approved a final rule to address changes to credit loss accounting under GAAP, including banking organizations’ implementation of CECL. The final rule provides banking organizations the option to phase in over a three-year period the day-one adverse effects on regulatory capital that may result from the adoption of the new accounting standard. In March 2020, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC announced an interim final rule to delay the estimated impact on regulatory capital stemming from the implementation of CECL. The interim final rule maintains the three-year transition option in the previous rule and provides banks the option to delay for two years an estimate of CECL’s effect on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). The Company is adopting the capital transition relief over the permissible five-year period. On March 27, 2020, the Coronavirus, Aid, Relief, and Economic Security ("CARES") Act, which provides relief from certain requirements under GAAP, was signed into law. Section 4013 of the CARES Act gives entities temporary relief from the accounting and disclosure requirements for troubled debt restructurings ("TDRs") under ASC 310-40 in certain situations. In addition, on April 7, 2020, certain regulatory banking agencies issued an interagency statement that offers practical expedients for evaluating whether loan modifications in response to the COVID-19 pandemic are TDRs. The interagency statement was originally issued on March 22, 2020, but was revised to address the relationship between their original TDR guidance and the guidance in Section 4013 of the CARES Act. To qualify for TDR accounting and disclosure relief under the CARES Act, the applicable loan must not have been more than 30 days past due as of December 31, 2019, and the modification must be executed during the period beginning on March 1, 2020, and ending on the earlier of December 31, 2020, or the date that is 60 days after the termination date of the national emergency declared by the president on March 13, 2020, under the National Emergencies Act related to the outbreak of COVID-19. The CARES Act applies to modifications made as a result of COVID-19, including forbearance agreements, interest rate modifications, repayment plans, and other arrangements to defer or delay payment of principal or interest. The interagency statement does not require the modification to be completed within a certain time period if it is related to COVID-19 and the loan was not more than 30 days past due as of the date of the Company’s implementation of its modification programs. Moreover, the interagency statement applies to short-term modifications including payment deferrals, fee waivers, extensions of repayment terms, or other insignificant payment delays as a result of COVID-19. The Company will apply Section 4013 of the CARES Act and the interagency statement in connection with applicable modifications. For modifications that qualify under either the CARES Act or the interagency statement, TDR accounting and reporting is suspended through the period of the modification; however, the Company will continue to apply its existing non-accrual policies including consideration of the loan's past due status which is determined on the basis of the contractual terms of the loan. Once a loan has been contractually modified, the past due status is generally based on the updated terms including payment deferrals. Future Application of Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-14, “Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans.” This ASU amends and modifies the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. The amendments in this update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. ASU No. 2018-14 is effective for fiscal years ending after December 15, 2020, with early adoption permitted. As ASU No. 2018-14 only revises disclosure requirements, it will not have a material impact on the Consolidated Financial Statements. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU No. 2019-12 removes specific exceptions to the general principles in FASB ASC Topic 740. It eliminates the need for an organization to analyze whether the following apply in a given period: (1) exception to the incremental approach for intraperiod tax allocation; (2) exceptions to accounting for basis differences when there are ownership changes in foreign investments; and (3) exception in interim period income tax accounting for year-to-date losses that exceed anticipated losses. ASU 2019-12 also improves financial statement preparers’ application of income tax-related guidance and simplifies: (1) franchise taxes that are partially based on income; (2) transactions with a government that result in a step up in the tax basis of goodwill; (3) separate financial statements of legal entities that are not subject to tax; and (4) enacted changes in tax laws in interim periods. The amendments in this ASU become effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted. The adoption is not expected to have a material impact on the Company's Consolidated Financial Statements. In January 2020, the FASB issued ASU No. 2020-01, “Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions Between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues Task Force)”. ASU No. 2020-01 clarifies the interaction of the accounting for equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain forward contracts and purchased options accounted for under Topic 815. The amendments clarify that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. In addition, this ASU provides direction that a company should not consider whether the underlying securities would be accounted for under the equity method or the fair value option when it is determining the accounting for certain forward contracts and purchased options, upon either settlement or exercise. The amendments in this ASU become effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted, and the amendments are to be applied prospectively. The adoption is not expected to have a material impact on the Company's Consolidated Financial Statements. In March 2020, the FASB issued ASU No. 2020-04, “Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU No. 2020-04 provides temporary optional expedients and exceptions to GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates, such as SOFR. For instance, entities can elect not to apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. An entity that makes this election would not have to remeasure the contracts at the modification date or reassess a previous accounting determination. Entities can also elect various optional expedients that would allow them to continue applying hedge accounting for hedging relationships affected by reference rate reform, if certain criteria are met. Finally, entities can make a one-time election to sell and/or reclassify held-to-maturity debt securities that reference an interest rate affected by reference rate reform. It is anticipated that this ASU will simplify any modifications that are executed between the selected start date (yet to be determined) and December 31, 2022 that are directly related to LIBOR transition by allowing prospective recognition of the continuation of the contract, rather than extinguishment of the old contract resulting in writing off unamortized fees/costs. The Company is currently evaluating the impact of adopting the new guidance on the Consolidated Financial Statements. In January 2021, the FASB issued ASU No. 2021-01, “Reference Rate Reform (Topic 848): Scope.” ASU No. 2021-01 clarifies that certain optional expedients and exceptions in ASC 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. ASU No. 2021-01 also amends the expedients and exceptions in ASC 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. ASU No. 2021-01 was effective upon issuance and generally can be applied through December 31, 2022. The adoption of ASU 2021-01 did not significantly impact the Company’s Consolidated Financial Statements.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICES (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The impact of the January 1, 2020, adoption entry is summarized in the table below: (in thousands) December 31, 2019 Pre-ASC 326 Adoption Impact of Adoption January 1, 2020 Post-ASC 326 Adoption Assets: Loans 9,502,428 — 9,502,428 PCD gross up — 15,326 15,326 Fair value option — (15,291) (15,291) Total loans 9,502,428 35 9,502,463 Allowance for credit losses on loans 63,575 25,434 89,009 Allowance for credit losses on securities — 309 309 Deferred tax assets, net 51,165 8,993 60,158 Liabilities and shareholders' equity: Other liabilities (ACL unfunded loan commitments) 100 7,993 8,093 Retained earnings 361,082 (24,380) 336,702 (In thousands) December 31, 2019 Statement Balance Impact of ASC 326 Adoption January 1, 2020 Post-ASC 326 Adoption Loans: Construction $ 448,452 $ 187 $ 448,639 Commercial multifamily 631,740 252 631,992 Commercial real estate owner occupied 673,308 3,185 676,493 Commercial real estate non-owner occupied 2,189,780 6,540 2,196,320 Commercial and industrial 1,843,683 (12,212) 1,831,471 Residential real estate 2,853,385 1,868 2,855,253 Home equity 378,793 10 378,803 Consumer other 483,287 205 483,492 Total $ 9,502,428 $ 35 $ 9,502,463 Allowance: Construction $ 2,713 $ (342) $ 2,371 Commercial multifamily 4,413 (1,842) 2,571 Commercial real estate owner occupied 4,880 6,062 10,942 Commercial real estate non-owner occupied 16,344 11,201 27,545 Commercial and industrial 20,099 (2,189) 17,910 Residential real estate 9,970 6,799 16,769 Home equity 1,470 4,884 6,354 Consumer other 3,686 861 4,547 Total $ 63,575 $ 25,434 $ 89,009

DISCONTINUED OPERATIONS AND H_2

DISCONTINUED OPERATIONS AND HELD FOR SALE (Tables)	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Summary of Discontinued Operations	The following is a summary of the assets and liabilities of the discontinued operations of FCLS at December 31, 2020 and December 31, 2019: (in thousands) December 31, 2020 December 31, 2019 Assets Loans held for sale, at fair value $ — $ 132,655 Premises and equipment, net — 1,073 Mortgage servicing rights, at fair value — 12,299 Mortgage banking derivatives — 2,329 Right-of-use asset — 3,462 Deferred tax — (3,418) Other assets — 5,732 Total assets $ — $ 154,132 Liabilities Customer payments in process $ — $ 15,372 Lease liability — 3,494 Other liabilities — 7,615 Total liabilities $ — $ 26,481 The following presents operating results of the discontinued operations of FCLS for the years ended December 31, 2020, 2019, and 2018: Years Ended December 31, (in thousands) 2020 2019 2018 Interest income $ 1,525 $ 6,085 $ 5,267 Interest expense 391 3,372 2,131 Net interest income 1,134 2,713 3,136 Non-interest (loss)/income (4,740) 38,517 35,574 Total net revenue (3,606) 41,230 38,710 Non-interest expense 23,249 46,769 43,477 (Loss) from discontinued operations before income taxes (26,855) (5,539) (4,767) Income tax (benefit) (7,013) (1,468) (1,313) Net (loss) from discontinued operations $ (19,842) $ (4,071) $ (3,454) The following is a summary of the assets and liabilities related to the branch sale at December 31, 2020: (in thousands) December 31, 2020 Assets Loans $ 300,599 Other assets 16,705 Total assets $ 317,304 Liabilities Deposits $ 617,377 Other liabilities 12,688 Total liabilities $ 630,065

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Summary of Securities Available for Sale (AFS) and Securities	The following is a summary of securities available for sale (“AFS”) , held to maturity (“HTM”), and marketable equity securities: (In thousands) Amortized Gross Gross Fair Value Allowance December 31, 2020 Securities available for sale Debt securities: Municipal bonds and obligations $ 90,273 $ 7,530 $ — $ 97,803 $ — Agency collateralized mortgage obligations 740,225 16,836 (235) 756,826 — Agency mortgage-backed securities 433,311 4,954 (133) 438,132 — Agency commercial mortgage-backed securities 278,990 9,835 (175) 288,650 — Corporate bonds 59,098 942 (10) 60,030 — Other bonds and obligations 52,080 1,719 (8) 53,791 — Total securities available for sale 1,653,977 41,816 (561) 1,695,232 — Securities held to maturity Municipal bonds and obligations 246,520 20,106 — 266,626 64 Agency collateralized mortgage obligations 153,561 5,989 (171) 159,379 — Agency mortgage-backed securities 35,865 198 (29) 36,034 — Agency commercial mortgage-backed securities 25,481 590 (12) 26,059 — Tax advantaged economic development bonds 3,369 93 — 3,462 40 Other bonds and obligations 295 — — 295 — Total securities held to maturity 465,091 26,976 (212) 491,855 104 Marketable equity securities 18,061 767 (315) 18,513 — Total $ 2,137,129 $ 69,559 $ (1,088) $ 2,205,600 $ 104 December 31, 2019 Securities available for sale Debt securities: Municipal bonds and obligations $ 104,325 $ 5,813 $ — $ 110,138 $ — Agency collateralized mortgage obligations 742,550 6,431 (169) 748,812 — Agency mortgage-backed securities 146,589 1,515 (360) 147,744 — Agency commercial mortgage-backed securities 148,066 176 (1,146) 147,096 — Corporate bonds 115,395 1,788 (607) 116,576 — Other bonds and obligations 40,414 780 (5) 41,189 — Total securities available for sale 1,297,339 16,503 (2,287) 1,311,555 — Securities held to maturity Municipal bonds and obligations 252,936 13,095 (5) 266,026 — Agency collateralized mortgage-backed securities 69,667 2,870 (50) 72,487 — Agency mortgage-backed securities 6,271 29 — 6,300 — Agency commercial mortgage-backed securities 10,353 51 — 10,404 — Tax advantaged economic development bonds 18,456 218 (910) 17,764 — Other bonds and obligations 296 — — 296 — Total securities held to maturity 357,979 16,263 (965) 373,277 — Marketable equity securities 37,138 5,147 (729) 41,556 — Total $ 1,692,456 $ 37,913 $ (3,981) $ 1,726,388 $ —
Schedule of Debt Securities, Held to Maturity, Activity	The following table summarizes the activity in the allowance for credit losses for debt securities held to maturity by security type for the year ended December 31, 2020: (In thousands) Municipal bonds and obligations Tax advantaged economic development bonds Total Balance at December 31, 2019 $ — $ — $ — Impact of ASC 326 adoption 83 226 309 Provision for credit losses- reversal (19) (186) (205) Balance at December 31, 2020 $ 64 $ 40 $ 104
Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) and Held to Maturity (HTM) Securities, Segregated by Contractual Maturity	The amortized cost and estimated fair value of AFS and HTM securities, segregated by contractual maturity at year-end 2020 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Mortgage-backed securities and collateralized mortgage obligations are shown in total, as their maturities are highly variable. Available for sale Held to maturity (In thousands) Amortized Fair Amortized Fair Within 1 year $ 33,248 $ 33,265 $ 1,950 $ 1,952 Over 1 year to 5 years 8,148 8,276 3,216 3,233 Over 5 years to 10 years 67,952 69,619 23,050 24,026 Over 10 years 92,103 100,464 221,968 241,172 Total bonds and obligations 201,451 211,624 250,184 270,383 Mortgage-backed securities 1,452,526 1,483,608 214,907 221,472 Total $ 1,653,977 $ 1,695,232 $ 465,091 $ 491,855
Schedule of Amortized Cost and Fair Values of Pledged Securities	The total amortized cost and fair values of these pledged securities follows. Additionally, there is a blanket lien on certain securities to collateralize borrowings from the FHLBB, as discussed further in Note 11 - Borrowed Funds. 2020 2019 (In thousands) Amortized Fair Amortized Fair Securities pledged to swap counterparties $ 37,532 $ 37,815 $ 25,728 $ 25,828 Securities pledged for municipal deposits 156,047 166,570 168,740 175,719 Total $ 193,579 $ 204,385 $ 194,468 $ 201,547
Schedule of Components of Net Realized Gains and Losses on the Sale of AFS Securities	The components of net recognized gains and losses on the sale of AFS securities and the fair value change of marketable equities are as follows: (In thousands) 2020 2019 2018 Gross recognized gains $ 4,602 $ 7,492 $ 3,256 Gross recognized losses (11,133) (3,103) (6,975) Net recognized gains/(losses) $ (6,531) $ 4,389 $ (3,719)
Schedule of Securities with Unrealized Losses, Segregated by the Duration of their Continuous Unrealized Loss Positions	Debt securities with unrealized losses, segregated by the duration of their continuous unrealized loss positions, are summarized as follows: Less Than Twelve Months Over Twelve Months Total (In thousands) Gross Fair Gross Fair Gross Fair December 31, 2020 Securities available for sale Debt securities: Agency collateralized mortgage obligations $ 235 $ 77,898 $ — $ — $ 235 $ 77,898 Agency mortgage-backed securities 131 39,939 2 256 133 40,195 Agency commercial mortgage-back securities 175 51,435 — — 175 51,435 Corporate bonds 10 4,875 — — 10 4,875 Other bonds and obligations — — 8 1,030 8 1,030 Total securities available for sale $ 551 $ 174,147 $ 10 $ 1,286 $ 561 $ 175,433 Securities held to maturity Agency collateralized mortgage obligations 171 25,048 — — 171 25,048 Agency mortgage-backed securities 29 20,710 — — 29 20,710 Agency commercial mortgage-back securities 12 10,216 — — 12 10,216 Total securities held to maturity 212 55,974 — — 212 55,974 Total $ 763 $ 230,121 $ 10 $ 1,286 $ 773 $ 231,407 December 31, 2019 Securities available for sale Debt securities: Agency collateralized mortgage obligations $ 127 $ 52,623 $ 42 $ 6,267 $ 169 $ 58,890 Agency mortgage-backed securities 59 10,640 301 23,404 360 34,044 Agency commercial mortgage-backed securities 1,097 116,324 49 11,250 1,146 127,574 Corporate bonds — — 607 42,823 607 42,823 Other bonds and obligations 4 1,239 1 29 5 1,268 Total securities available for sale $ 1,287 $ 180,826 $ 1,000 $ 83,773 $ 2,287 $ 264,599 Securities held to maturity Municipal bonds and obligations 5 800 — — 5 800 Agency collateralized mortgage obligations 50 9,778 — — 50 9,778 Tax advantaged economic development bonds — — 910 6,925 910 6,925 Total securities held to maturity 55 10,578 910 6,925 965 17,503 Total $ 1,342 $ 191,404 $ 1,910 $ 90,698 $ 3,252 $ 282,102

LOANS AND RELATED ALLOWANCE F_2

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES (Tables)	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The impact of the January 1, 2020, adoption entry is summarized in the table below: (in thousands) December 31, 2019 Pre-ASC 326 Adoption Impact of Adoption January 1, 2020 Post-ASC 326 Adoption Assets: Loans 9,502,428 — 9,502,428 PCD gross up — 15,326 15,326 Fair value option — (15,291) (15,291) Total loans 9,502,428 35 9,502,463 Allowance for credit losses on loans 63,575 25,434 89,009 Allowance for credit losses on securities — 309 309 Deferred tax assets, net 51,165 8,993 60,158 Liabilities and shareholders' equity: Other liabilities (ACL unfunded loan commitments) 100 7,993 8,093 Retained earnings 361,082 (24,380) 336,702 (In thousands) December 31, 2019 Statement Balance Impact of ASC 326 Adoption January 1, 2020 Post-ASC 326 Adoption Loans: Construction $ 448,452 $ 187 $ 448,639 Commercial multifamily 631,740 252 631,992 Commercial real estate owner occupied 673,308 3,185 676,493 Commercial real estate non-owner occupied 2,189,780 6,540 2,196,320 Commercial and industrial 1,843,683 (12,212) 1,831,471 Residential real estate 2,853,385 1,868 2,855,253 Home equity 378,793 10 378,803 Consumer other 483,287 205 483,492 Total $ 9,502,428 $ 35 $ 9,502,463 Allowance: Construction $ 2,713 $ (342) $ 2,371 Commercial multifamily 4,413 (1,842) 2,571 Commercial real estate owner occupied 4,880 6,062 10,942 Commercial real estate non-owner occupied 16,344 11,201 27,545 Commercial and industrial 20,099 (2,189) 17,910 Residential real estate 9,970 6,799 16,769 Home equity 1,470 4,884 6,354 Consumer other 3,686 861 4,547 Total $ 63,575 $ 25,434 $ 89,009
Schedule of Loans	The following is a summary of total loans by regulatory call report code with sub-segmentation based on underlying collateral for certain loan types: (In thousands) December 31, 2020 December 31, 2019 Construction $ 454,513 $ 448,452 Commercial multifamily 483,350 631,740 Commercial real estate owner occupied 552,413 673,308 Commercial real estate non-owner occupied 2,119,263 2,189,780 Commercial and industrial 1,943,164 1,843,683 Residential real estate 1,931,681 2,853,385 Home equity 293,981 378,793 Consumer other 303,154 483,287 Total loans $ 8,081,519 $ 9,502,428 Allowance for credit losses 127,302 63,575 Net loans $ 7,954,217 $ 9,438,853 The following is a summary of total loans as of December 31, 2019: December 31, 2019 (In thousands) Business Acquired Total Commercial real estate: Construction $ 382,014 $ 47,792 $ 429,806 Other commercial real estate 2,414,942 1,189,521 3,604,463 Total commercial real estate 2,796,956 1,237,313 4,034,269 Commercial and industrial loans: 1,442,617 397,891 1,840,508 Total commercial loans 4,239,573 1,635,204 5,874,777 Residential mortgages: 1-4 family 2,143,817 533,536 2,677,353 Construction 4,641 3,478 8,119 Total residential mortgages 2,148,458 537,014 2,685,472 Consumer loans: Home equity 273,867 106,724 380,591 Auto and other 504,599 56,989 561,588 Total consumer loans 778,466 163,713 942,179 Total loans $ 7,166,497 $ 2,335,931 $ 9,502,428
Schedule of Allowance for Credit Losses for Loans, Activity	The Company’s activity in the allowance for credit losses for loans for the year ended December 31, 2020 was as follows: (In thousands) Balance at Beginning of Period Impact of Adopting ASC 326 Sub-total Charge-offs Recoveries Provision for Credit Losses Balance at End of Period Year ended December 31, 2020 Construction $ 2,713 $ (342) $ 2,371 $ (834) $ — $ 3,574 $ 5,111 Commercial multifamily 4,413 (1,842) 2,571 (100) 100 3,345 5,916 Commercial real estate owner occupied 4,880 6,062 10,942 (8,686) 1,053 9,071 12,380 Commercial real estate non-owner occupied 16,344 11,201 27,545 (11,653) 307 19,651 35,850 Commercial and industrial 20,099 (2,189) 17,910 (19,328) 4,285 22,146 25,013 Residential real estate 9,970 6,799 16,769 (2,285) 1,359 12,648 28,491 Home equity 1,470 4,884 6,354 (347) 292 183 6,482 Consumer other 3,686 861 4,547 (2,562) 609 5,465 8,059 Total allowance for credit losses $ 63,575 $ 25,434 $ 89,009 $ (45,795) $ 8,005 $ 76,083 $ 127,302
Schedule of Allowance for Credit Losses on Unfunded Loan Commitments, Activity	The Company’s activity in the allowance for credit losses on unfunded commitments for the year ended December 31, 2020 was as follows: (In thousands) Total Balance at December 31, 2019 $ 100 Impact of adopting ASC 326 7,993 Sub-Total 8,093 Release of expense for credit losses (464) Balance at December 31, 2020 $ 7,629
Schedule of Loans by Risk Rating	The following table presents the Company’s loans by risk category: Term Loans Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total As of December 31, 2020 Construction Risk rating Pass $ 38,374 $ 255,377 $ 114,690 $ 28,474 $ 9,519 $ 2,766 $ 1,000 $ — $ 450,200 Special Mention — — 313 — — — — — 313 Substandard — — — 4,000 — — — — 4,000 Total $ 38,374 $ 255,377 $ 115,003 $ 32,474 $ 9,519 $ 2,766 $ 1,000 $ — $ 454,513 Commercial multifamily: Risk rating Pass $ 31,438 $ 57,659 $ 74,932 $ 77,746 $ 81,066 $ 153,818 $ 20 $ — $ 476,679 Special Mention — — — — — — — — — Substandard — — — — 47 6,479 145 — 6,671 Total $ 31,438 $ 57,659 $ 74,932 $ 77,746 $ 81,113 $ 160,297 $ 165 $ — $ 483,350 Commercial real estate owner occupied: Risk rating Pass $ 58,327 $ 84,839 $ 104,797 $ 64,693 $ 44,300 $ 169,197 $ 1,194 $ — $ 527,347 Special Mention 535 2,569 1,136 1,009 800 2,579 — — 8,628 Substandard — 1,266 3,597 1,685 1,439 8,451 — — 16,438 Total $ 58,862 $ 88,674 $ 109,530 $ 67,387 $ 46,539 $ 180,227 $ 1,194 $ — $ 552,413 Commercial real estate non-owner occupied: Risk rating Pass $ 180,520 $ 292,386 $ 435,440 $ 223,935 $ 303,221 $ 497,066 $ 15,393 $ — $ 1,947,961 Special Mention — 279 2,068 6,958 11,798 44,961 1,068 — 67,132 Substandard 7,804 3,529 4,235 19,632 2,124 66,651 195 — 104,170 Total $ 188,324 $ 296,194 $ 441,743 $ 250,525 $ 317,143 $ 608,678 $ 16,656 $ — $ 2,119,263 Commercial and industrial: Risk rating Pass $ 754,260 $ 159,046 $ 205,651 $ 130,985 $ 48,326 $ 148,222 $ 368,769 $ — $ 1,815,259 Special Mention 1,467 5,753 5,267 2,851 1,601 65 12,408 — 29,412 Substandard 7,392 39,822 24,951 7,765 3,504 5,630 9,099 — 98,163 Doubtful — — — — — — 330 — 330 Total $ 763,119 $ 204,621 $ 235,869 $ 141,601 $ 53,431 $ 153,917 $ 390,606 $ — $ 1,943,164 Residential real estate Risk rating Pass $ 150,583 $ 146,142 $ 272,399 $ 320,384 $ 333,159 $ 691,078 $ 3,281 $ — $ 1,917,026 Special Mention 384 — 454 1,430 — 362 — — 2,630 Substandard 991 39 703 902 417 8,964 9 — 12,025 Total $ 151,958 $ 146,181 $ 273,556 $ 322,716 $ 333,576 $ 700,404 $ 3,290 $ — $ 1,931,681 For home equity and consumer other loan portfolio segments, Berkshire evaluates credit quality based on the aging status of the loan and by payment activity. The performing or nonperforming status is updated on an ongoing basis dependent upon improvement and deterioration in credit quality. The following table presents the amortized cost based on payment activity: Term Loans Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total As of December 31, 2020 Home equity: Payment performance Performing $ 2,445 $ 1,960 $ 316 $ 1,859 $ 499 $ 1,882 $ 282,123 $ — $ 291,084 Nonperforming — — 1 — — — 2,896 — 2,897 Total $ 2,445 $ 1,960 $ 317 $ 1,859 $ 499 $ 1,882 $ 285,019 $ — $ 293,981 Consumer other: Payment performance Performing $ 15,193 $ 35,317 $ 101,730 $ 69,366 $ 35,421 $ 31,327 $ 9,339 $ — $ 297,693 Nonperforming 39 316 1,511 1,599 1,585 407 4 — 5,461 Total $ 15,232 $ 35,633 $ 103,241 $ 70,965 $ 37,006 $ 31,734 $ 9,343 $ — $ 303,154 The following table summarizes information about total loans rated Special Mention or lower at December 31, 2020. The table below includes consumer loans that are Special Mention and Substandard accruing that are classified as performing based on payment activity. (In thousands) December 31, 2020 Non-Accrual $ 64,948 Substandard Accruing 185,207 Total Classified 250,155 Special Mention 109,299 Total Criticized $ 359,454 The following tables present the Company’s loans by risk rating at December 31, 2019: Business Activities Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 382,014 $ 2,354,375 $ 2,736,389 Special mention — 12,167 12,167 Substandard — 48,400 48,400 Total $ 382,014 $ 2,414,942 $ 2,796,956 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 1,366,342 Special mention 50,072 Substandard 24,112 Doubtful 2,091 Total $ 1,442,617 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 2,139,753 $ 4,641 $ 2,144,394 Special mention 714 — 714 Substandard 3,350 — 3,350 Total $ 2,143,817 $ 4,641 $ 2,148,458 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 272,772 $ 501,871 $ 774,643 Nonperforming 1,095 2,728 3,823 Total $ 273,867 $ 504,599 $ 778,466 Acquired Loans Commercial Real Estate Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Construction Real Estate Total Commercial Real Estate Grade: Pass $ 46,396 $ 1,130,333 $ 1,176,729 Special mention — 5,993 5,993 Substandard 1,396 53,195 54,591 Total $ 47,792 $ 1,189,521 $ 1,237,313 Commercial and Industrial Loans Credit Risk Profile by Creditworthiness Category December 31, 2019 (In thousands) Total Commercial and Industrial Loans Grade: Pass $ 373,744 Special mention 4,404 Substandard 19,743 Total $ 397,891 Residential Mortgages Credit Risk Profile by Internally Assigned Grade December 31, 2019 (In thousands) 1-4 Family Construction Total Residential Mortgages Grade: Pass $ 528,282 $ 3,478 $ 531,760 Special mention 592 — 592 Substandard 4,662 — 4,662 Total $ 533,536 $ 3,478 $ 537,014 Consumer Loans Credit Risk Profile Based on Payment Activity December 31, 2019 (In thousands) Home Equity Auto and Other Total Consumer Loans Performing $ 106,007 $ 56,724 $ 162,731 Nonperforming 717 265 982 Total $ 106,724 $ 56,989 $ 163,713
Summary of Past Due Loans	The following is a summary of loans by past due status at December 31, 2020: (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Current Total Loans December 31, 2020 Construction $ — $ — $ — $ — $ 454,513 $ 454,513 Commercial multifamily — — 757 757 482,593 483,350 Commercial real estate owner occupied 809 631 4,894 6,334 546,079 552,413 Commercial real estate non-owner occupied 315 168 38,389 38,872 2,080,391 2,119,263 Commercial and industrial 3,016 3,259 12,982 19,257 1,923,907 1,943,164 Residential real estate 2,068 2,630 11,115 15,813 1,915,868 1,931,681 Home equity 244 284 2,897 3,425 290,556 293,981 Consumer other 2,109 777 5,364 8,250 294,904 303,154 Total $ 8,561 $ 7,749 $ 76,398 $ 92,708 $ 7,988,811 $ 8,081,519 The following is a summary of past due loans at December 31, 2019: Business Activities Loans (in thousands) 30-59 Days 60-89 Days >90 Days Past Due Total Past Current Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 382,014 $ 382,014 $ — Commercial real estate 423 89 15,623 16,135 2,398,807 2,414,942 — Total 423 89 15,623 16,135 2,780,821 2,796,956 — Commercial and industrial loans Total 2,841 2,033 10,662 15,536 1,427,081 1,442,617 122 Residential mortgages: 1-4 family 1,669 714 3,350 5,733 2,138,084 2,143,817 800 Construction — — — — 4,641 4,641 — Total 1,669 714 3,350 5,733 2,142,725 2,148,458 800 Consumer loans: Home equity 149 — 1,147 1,296 272,571 273,867 52 Auto and other 4,709 990 2,729 8,428 496,171 504,599 1 Total 4,858 990 3,876 9,724 768,742 778,466 53 Total $ 9,791 $ 3,826 $ 33,511 $ 47,128 $ 7,119,369 $ 7,166,497 $ 975 Acquired Loans (in thousands) 30-59 Days 60-89 Days >90 Days Past Due Total Past Acquired Total Loans Past Due > December 31, 2019 Commercial real estate: Construction $ — $ — $ — $ — $ 1,396 $ 47,792 $ — Commercial real estate 3,907 245 10,247 14,399 21,639 1,189,521 5,751 Total 3,907 245 10,247 14,399 23,035 1,237,313 5,751 Commercial and industrial loans Total 888 299 1,275 2,462 26,718 397,891 442 Residential mortgages: 1-4 family 745 491 932 2,168 10,840 533,536 139 Construction — — — — — 3,478 — Total 745 491 932 2,168 10,840 537,014 139 Consumer loans: Home equity 346 222 789 1,357 540 106,724 72 Auto and other 120 22 265 407 286 56,989 — Total 466 244 1,054 1,764 826 163,713 72 Total $ 6,006 $ 1,279 $ 13,508 $ 20,793 $ 61,419 $ 2,335,931 $ 6,404
Summary of Information Pertaining to Non-accrual Loans	The following is a summary of loans on nonaccrual status and loans past due 90 days or more and still accruing as of December 31, 2020: January 1, 2020 December 31, 2020 (In thousands) Nonaccrual Amortized Cost Nonaccrual Amortized Cost Nonaccrual With No Related Allowance Past Due 90 Days or Greater and Accruing Interest Income Recognized on Nonaccrual Construction $ — $ — $ — $ — $ — Commercial multifamily 811 757 591 — — Commercial real estate owner occupied 15,389 4,509 2,290 385 — Commercial real estate non-owner occupied 1,031 29,572 13,912 8,817 — Commercial and industrial 11,218 12,441 4,725 541 — Residential real estate 6,411 9,711 5,739 1,404 — Home equity 1,798 2,654 159 243 — Consumer other 2,982 5,304 2 60 — Total $ 39,640 $ 64,948 $ 27,418 $ 11,450 $ — The following is summary information pertaining to non-accrual loans at December 31, 2019: December 31, 2019 (In thousands) Business Activities Acquired Loans Total Commercial real estate: Construction $ — $ — $ — Other commercial real estate 15,623 4,496 20,119 Total 15,623 4,496 20,119 Commercial and industrial loans: Total 10,540 833 11,373 Residential mortgages: 1-4 family 2,550 793 3,343 Construction — — — Total 2,550 793 3,343 Consumer loans: Home equity 1,095 717 1,812 Auto and other 2,728 265 2,993 Total 3,823 982 4,805 Total non-accrual loans $ 32,536 $ 7,104 $ 39,640
Schedule of Collateral Dependent Loans	The following table presents the amortized cost basis of individually analyzed collateral-dependent loans by loan portfolio segment: Type of Collateral (In thousands) Real Estate Investment Securities/Cash Other December 31, 2020 Commercial multifamily $ 591 $ — $ — Commercial real estate owner occupied 5,714 — — Commercial real estate non-owner occupied 30,950 — — Commercial and industrial 973 36 3,758 Residential real estate 5,081 — — Home equity 145 — — Consumer other 51 — — Total loans $ 43,505 $ 36 $ 3,758
Schedule of Recorded Investment and Number of Modifications for TDRs Identified During the Period	The following table presents activity in TDRs for the year ended December 31, 2020: (In thousands) Balance at Beginning of Period Principal Payments TDR Status Change Other Additions/(Reductions) Newly Identified TDRs Balance at End of Period Year ended December 31, 2020 Commercial multifamily $ 793 $ (39) $ — $ — $ — $ 754 Commercial real estate owner occupied 13,331 (5,734) — (5,884) 18 1,731 Commercial real estate non-owner occupied 1,373 (1) — 1,719 10,593 13,684 Commercial and industrial 1,449 (289) — (60) 1,586 2,686 Residential real estate 2,045 (160) — (361) — 1,524 Home equity 277 (22) — (122) — 133 Consumer other 48 (12) — — — 36 Total $ 19,316 $ (6,257) $ — $ (4,708) $ 12,197 $ 20,548 The following table discloses the modifications for TDRs where a concession has been made within the previous 12 months, that then defaulted in the respective reporting period. There were no TDRs for which there was a payment default within twelve months following the modification during the year ended December 31, 2020. For the year ended 2019, there was one loan that was restructured that had subsequently defaulted during the reporting period. (dollars in thousands) Number of Loans Recorded Investment Year ended December 31, 2019 Commercial and industrial - other 1 $ 195 Total 1 $ 195 The following table presents the Company’s TDR activity in 2019 and 2018: (In thousands) 2019 2018 Balance at beginning of year $ 27,415 $ 41,990 Principal payments (6,086) (8,547) TDR status change (1) — — Other reductions (2) (4,076) (8,713) Newly identified TDRs 2,063 2,685 Balance at end of year $ 19,316 $ 27,415 _____________________ (1) TDR status change classification represents TDR loans with a specified interest rate equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk and the loan was on current payment status and not impaired based on the terms specified by the restructuring agreement. (2) Other reductions classification consists of transfer to other real estate owned, charge-offs to loans, and other loan sale payoffs.
Schedule of TDR Activity	The following table presents loans modified as TDRs that occurred during the years ended December 31, 2020, 2019, and 2018: (dollars in thousands) Total Year ended December 31, 2020 TDR: Number of loans 16 Pre-modification outstanding recorded investment $ 12,197 Post-modification outstanding recorded investment $ 12,197 Year ended December 31, 2019 TDR: Number of loans 13 Pre-modification outstanding recorded investment $ 2,063 Post-modification outstanding recorded investment $ 2,063 Year ended December 31, 2018 TDR: Number of loans 10 Pre-modification outstanding recorded investment $ 2,685 Post-modification outstanding recorded investment $ 2,685
Schedule of Total Unamortized Net Costs and Premiums Included in the Total Loans for Historical Loans	Total unamortized net costs and premiums included in the December 31, 2019 total loans for business activity loans were the following: (In thousands) December 31, 2019 Unamortized net loan origination costs $ 13,259 Unamortized net premium on purchased loans 2,643 Total unamortized net costs and premiums $ 15,902
Schedule of Activity in the Accretable Yield for the Acquired Loan Portfolio that Falls Under the Purview of ASC 310-30, Accounting for Certain Loans or Debt Securities Acquired in a Transfer	The following table summarizes activity in the accretable yield for the acquired loan portfolio that falls under the purview of ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality : (In thousands) 2019 2018 Balance at beginning of period $ 2,840 $ 11,561 Acquisitions 4,200 — Accretion (9,619) (23,109) Net reclassification from nonaccretable difference 7,430 17,347 Payments received, net (837) (2,878) Reclassification to TDR 9 — Disposals — (81) Balance at end of period 4,023 2,840
Schedule of Loans Evaluated for Impairment	Loans evaluated for impairment as of December 31, 2019 were as follows: Business Activities Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 19,192 $ 9,167 $ 3,019 $ 630 $ 32,008 Collectively evaluated 2,777,764 1,433,450 2,145,439 777,836 7,134,489 Total $ 2,796,956 $ 1,442,617 $ 2,148,458 $ 778,466 $ 7,166,497 Acquired Loans (In thousands) Commercial Commercial Residential Consumer Total Loans receivable: Balance at end of year Individually evaluated for impairment $ 4,241 $ 464 $ 372 $ 575 $ 5,652 Purchased credit-impaired loans 23,035 26,718 10,840 826 61,419 Collectively evaluated 1,210,037 370,709 525,802 162,312 2,268,860 Total $ 1,237,313 $ 397,891 $ 537,014 $ 163,713 $ 2,335,931
Summary of Impaired Loans	The following is a summary of impaired loans at December 31, 2019: Business Activities Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 18,676 $ 37,493 $ — Commercial and industrial loans 4,805 10,104 — Residential mortgages - 1-4 family 433 699 — Consumer - home equity 32 238 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 550 $ 1,411 $ 20 Commercial and industrial loans 4,166 12,136 122 Residential mortgages - 1-4 family 2,615 2,924 109 Consumer - home equity 594 614 42 Consumer - other 8 8 1 Total Commercial real estate $ 19,226 $ 38,904 $ 20 Commercial and industrial loans 8,971 22,240 122 Residential mortgages 3,048 3,623 109 Consumer 634 860 43 Total impaired loans $ 31,879 $ 65,627 $ 294 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet. (2) The Unpaid Principal Balance represents the customer's legal obligation to the Company. Acquired Loans December 31, 2019 (In thousands) Recorded Investment (1) Unpaid Principal Related Allowance With no related allowance: Other commercial real estate loans $ 3,200 $ 6,021 $ — Other commercial and industrial loans 437 532 — Residential mortgages - 1-4 family 292 293 — Consumer - home equity 416 844 — Consumer - other — — — With an allowance recorded: Other commercial real estate loans $ 1,033 $ 1,050 $ 97 Commercial and industrial loans 28 30 1 Residential mortgages - 1-4 family 84 110 8 Consumer - home equity 121 123 6 Consumer - other 39 37 6 Total Commercial real estate $ 4,233 $ 7,071 $ 97 Commercial and industrial loans 465 562 1 Residential mortgages 376 403 8 Consumer 576 1,004 12 Total impaired loans $ 5,650 $ 9,040 $ 118 (1) The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on the Consolidated Balance Sheet.
Summary of the Average Recorded Investment and Interest Income Recognized on Impaired Loans	The following is a summary of the average recorded investment and interest income recognized on impaired loans as of December 31, 2019 and 2018: Business Activities Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 19,805 $ 586 $ 24,078 $ 373 Other commercial and industrial 3,165 523 914 245 Residential mortgages - 1-4 family 185 17 428 20 Consumer-home equity 148 3 107 10 Consumer-other — — — — With an allowance recorded: Other commercial real estate $ 374 $ 107 $ 555 $ 30 Other commercial and industrial 2,533 793 1,259 139 Residential mortgages - 1-4 family 2,427 150 1,407 75 Consumer-home equity 349 32 98 6 Consumer - other 11 1 15 1 Total Commercial real estate $ 20,179 $ 693 $ 24,633 $ 403 Commercial and industrial 5,698 1,316 2,173 384 Residential mortgages 2,612 167 1,835 95 Consumer loans 508 36 220 17 Total impaired loans $ 28,997 $ 2,212 $ 28,861 $ 899 Acquired Loans December 31, 2019 December 31, 2018 (in thousands) Average Recorded Cash Basis Interest Average Recorded Cash Basis Interest With no related allowance: Other commercial real estate $ 1,603 $ 117 $ 3,280 $ 263 Other commercial and industrial 441 51 428 68 Residential mortgages - 1-4 family 241 11 290 9 Consumer - home equity 475 23 635 4 Consumer - other — — 13 1 With an allowance recorded: Other commercial real estate $ 1,005 $ 59 $ 950 $ 53 Other commercial and industrial 29 2 197 41 Residential mortgages - 1-4 family 88 7 26 9 Consumer - home equity 68 6 89 12 Consumer - other 41 2 11 3 Total Commercial real estate $ 2,608 $ 176 $ 4,230 $ 316 Commercial and industrial 470 53 625 109 Residential mortgages 329 18 316 18 Consumer loans 584 31 748 20 Total impaired loans $ 3,991 $ 278 $ 5,919 $ 463
Schedule of Activity in the Allowance for Loan Losses	Activity in the allowance for loan losses for 2019 and 2018 was as follows: Business Activities Loans Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Charged-off loans 6,577 23,799 635 3,322 34,333 Recoveries on charged-off loans 570 1,012 57 253 1,892 Provision/(releases) for loan losses 9,033 25,404 (1,417) 458 33,478 Balance at end of period $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Individually evaluated for impairment 20 122 109 43 294 Collectively evaluated 24,738 18,999 8,431 4,714 56,882 Total $ 24,758 $ 19,121 $ 8,540 $ 4,757 $ 57,176 Business Activities Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 16,843 $ 13,850 $ 9,420 $ 5,807 $ 45,920 Charged-off loans 5,859 4,275 157 3,187 13,478 Recoveries on charged-off loans 50 620 114 363 1,147 Provision/(releases) for loan losses 10,698 6,309 1,158 4,385 22,550 Balance at end of period $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Individually evaluated for impairment 9 49 128 11 197 Collectively evaluated 21,723 16,455 10,407 7,357 55,942 Total $ 21,732 $ 16,504 $ 10,535 $ 7,368 $ 56,139 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Charged-off loans 830 571 263 557 2,221 Recoveries on charged-off loans 672 438 116 123 1,349 Provision/(releases) for loan losses 1,111 126 365 339 1,941 Balance at end of period $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Individually evaluated for impairment 97 1 8 12 118 Collectively evaluated 4,009 1,056 840 376 6,281 Total $ 4,106 $ 1,057 $ 848 $ 388 $ 6,399 Acquired Loans (In thousands) Commercial Commercial and Residential Consumer Total Balance at beginning of period $ 3,856 $ 1,125 $ 598 $ 335 $ 5,914 Charged-off loans 1,812 524 1,091 1,106 4,533 Recoveries on charged-off loans 294 286 51 417 1,048 Provision/(releases) for loan losses 815 177 1,072 837 2,901 Balance at end of period $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330 Individually evaluated for impairment 9 4 36 48 97 Collectively evaluated 3,144 1,060 594 435 5,233 Total $ 3,153 $ 1,064 $ 630 $ 483 $ 5,330
Summary of Information About Total Loans Rated Special Mention or Lower	The following table summarizes information about total loans rated Special Mention or lower at December 31, 2019. The table below includes consumer loans that are Special Mention and Substandard accruing that are classified in the above table as performing based on payment activity. December 31, 2019 (In thousands) Business Acquired Loans Total Non-Accrual $ 32,536 $ 7,104 $ 39,640 Substandard Accruing 49,293 73,131 122,424 Total Classified 81,829 80,235 162,064 Special Mention 63,943 11,341 75,284 Total Criticized $ 145,772 $ 91,576 $ 237,348

PREMISES AND EQUIPMENT (Tables)

PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	Year-end premises and equipment are summarized as follows: (In thousands) 2020 2019 Estimated Useful Land $ 17,716 $ 17,816 N/A Buildings and improvements 113,853 116,997 5 - 39 years Furniture and equipment (1) 63,590 64,044 3 - 7 years Construction in process (1) 4,035 1,580 Premises and equipment, gross 199,194 200,437 Accumulated depreciation and amortization (1) (86,531) (78,966) Premises and equipment, net $ 112,663 $ 121,471 Premises and equipment, net from discontinued operations — 1,073 Premises and equipment, net from continuing operations $ 112,663 $ 120,398

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Increase in Goodwill and Goodwill by Reporting Units	The activity impacting goodwill in 2020 and 2019 is as follows: (In thousands) 2020 2019 Balance, beginning of the period $ 553,762 $ 518,325 Goodwill acquired and adjusted: SI Financial Group, Inc. — 36,379 Adjustments (1) — (942) Impairment (553,762) — Balance, end of the period $ — $ 553,762 ______________________________________________________________________________________________________
Schedule of Components of Other Intangible Assets	The components of other intangible assets are as follows: (In thousands) Gross Intangible Accumulated Net Intangible December 31, 2020 Non-maturity deposits (core deposit intangible) (1) $ 77,213 $ (45,257) $ 31,956 Insurance contracts 7,558 (7,558) — All other intangible assets 7,866 (5,003) 2,863 Total $ 92,637 $ (57,818) $ 34,819 December 31, 2019 Non-maturity deposits (core deposit intangible) $ 84,903 $ (42,663) $ 42,240 Insurance contracts 7,558 (7,553) 5 All other intangible assets 7,866 (4,496) 3,370 Total $ 100,327 $ (54,712) $ 45,615

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	12 Months Ended
	Dec. 31, 2020
Other Assets [Abstract]
Summary of Other Assets	Year-end other assets are summarized as follows: (In thousands) 2020 2019 Capitalized servicing rights (1) $ 16,348 $ 26,451 Accrued interest receivable 46,919 36,462 Accrued federal and state tax receivable 40,751 23,786 Right-of-use assets (1) 60,018 76,332 Derivative assets (1) 160,071 80,190 Deferred tax asset 46,370 51,165 Other (1) 16,753 18,381 Total other assets $ 387,230 $ 312,767 Total other assets from discontinued operations — 23,822 Total other assets from continuing operations $ 387,230 $ 288,945 (1) Includes other assets classified as discontinued operations. See Note 2 - Discontinued Operations for more information.
Schedule of Mortgage Servicing Rights Activity	Servicing rights activity was as follows: (In thousands) 2020 2019 Balance at beginning of year $ 26,451 $ 23,376 Additions 3,875 16,837 Amortization (3,761) (3,240) Change in fair value (9,266) (5,822) Allowance adjustment (951) (4,700) Balance at end of year (1) $ 16,348 $ 26,451 (1) As of December 31, 2020 and December 31, 2019, the servicing rights included in the total balance accounted for at fair value were $3.0 million and $12.3 million, respectively.

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Summary of Time Deposits	A summary of year-end time deposits is as follows: (In thousands) 2020 2019 Maturity date: Within 1 year $ 1,582,492 $ 2,734,870 Over 1 year to 2 years 545,100 582,622 Over 2 years to 3 years 171,810 145,976 Over 3 years to 4 years 32,358 90,731 Over 4 years to 5 years 51,073 33,754 Over 5 years 2,252 1,416 Total $ 2,385,085 $ 3,589,369 Account balances: Less than $100,000 $ 663,324 $ 905,190 $100,000 through $250,000 1,219,210 2,027,717 $250,000 or more 502,551 656,462 Total $ 2,385,085 $ 3,589,369

BORROWED FUNDS (Tables)

BORROWED FUNDS (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Borrowed Funds	Borrowed funds at December 31, 2020 and 2019 are summarized, as follows: 2020 2019 (in thousands, except rates) Principal Weighted Principal Weighted Short-term borrowings: Advances from the FHLBB $ 40,000 1.05 % $ 125,000 2.06 % Total short-term borrowings: 40,000 1.05 125,000 2.06 Long-term borrowings: Advances from the FHLBB 434,357 1.89 605,501 2.16 Paycheck Protection Program Liquidity Facility ("PPPLF") — — — — Subordinated notes 74,411 7.00 74,232 7.00 Junior subordinated borrowing - Trust I 15,464 2.06 15,464 3.76 Junior subordinated borrowing - Trust II 7,405 1.92 7,353 3.59 Total long-term borrowings: 531,637 2.61 702,550 2.72 Total $ 571,637 2.50 % $ 827,550 2.62 %
Summary of Maturities of FHLBB Advances	A summary of maturities of FHLBB advances at year-end 2020 is as follows: 2020 (In thousands) Amount Weighted Fixed rate advances maturing: 2021 $ 395,475 1.80 % 2022 58,489 1.92 2023 10,916 2.17 2024 54 — 2025 and beyond 9,423 1.63 Total FHLBB advances $ 474,357 1.82 %

OTHER LIABILITIES (Tables)

OTHER LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Summary of Other Liabilities	Year-end other liabilities are summarized as follows: (In thousands) 2020 2019 Derivative liabilities $ 65,758 $ 80,681 Capital and financing lease obligations 10,383 10,883 Asset purchase settlement payable (1) — 189 Employee benefits liability 38,830 44,781 Operating lease liabilities (1) 63,894 80,734 Accrued interest payable 3,867 11,625 Customer transaction clearing accounts 11,261 4,310 Other (1) 38,737 60,676 Total other liabilities $ 232,730 $ 293,879 Total other liabilities from discontinued operations — 26,481 Total other liabilities from continuing operations $ 232,730 $ 267,398 (1) Includes other liabilities classified as discontinued operations. See Note 2 - Discontinued Operations for more information.

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Schedule of changes in the Projected Benefit Obligation and Plan Assets	Information regarding the pension plan is as follows: December 31, (In thousands) 2020 2019 Change in projected benefit obligation: Projected benefit obligation at beginning of year $ 5,848 $ 5,669 Service Cost 66 72 Interest cost 178 228 Actuarial loss 519 542 Benefits paid (337) (333) Settlements (153) (330) Projected benefit obligation at end of year 6,121 5,848 Accumulated benefit obligation 6,121 5,848 Change in fair value of plan assets: Fair value of plan assets at plan beginning of year 5,799 5,522 Actual return on plan assets 740 940 Contributions by employer — — Benefits paid (337) (333) Settlements (153) (330) Fair value of plan assets at end of year 6,049 5,799 Underfunded status $ 72 $ 49 Information regarding the postretirement plans is as follows: December 31, (In thousands) 2020 2019 Change in accumulated postretirement benefit obligation: Accumulated post-retirement benefit obligation at beginning of year $ 4,039 $ 3,422 Service Cost 39 38 Interest cost 129 142 Participant contributions — — Actuarial loss 507 565 Benefits paid (73) (128) Accumulated post-retirement benefit obligation at end of year $ 4,641 $ 4,039 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Contributions by employer 73 128 Contributions by participant — — Benefits paid (73) (128) Fair value of plan assets at end of year $ — $ —
Schedule of Amounts Recognized in Statement of Financial Position	Amounts Recognized on Consolidated Balance Sheets Other Liabilities $ 72 $ 49 Amounts Recognized on Consolidated Balance Sheets Other Liabilities $ 4,641 $ 4,039
Schedule of Net Periodic Cost	Net periodic pension cost is comprised of the following: December 31, (In thousands) 2020 2019 Service Cost $ 66 $ 72 Interest Cost 178 228 Expected return on plan assets (393) (373) Amortization of unrecognized actuarial loss 94 117 Net periodic pension costs $ (55) $ 44 Net periodic post-retirement cost is comprised of the following: December 31, (In thousands) 2020 2019 Service cost $ 39 $ 38 Interest costs 129 142 Amortization of net prior service credit 84 83 Amortization of net actuarial loss 12 — Net periodic post-retirement costs $ 264 $ 263
Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive Income	Changes in plan assets and benefit obligations recognized in accumulated other comprehensive income are as follows: December 31, (In thousands) 2020 2019 Amortization of actuarial (loss) $ (94) $ (117) Actuarial (gain) loss 171 (25) Settlement charge — (70) Total recognized in accumulated other comprehensive income 77 (212) Total recognized in net periodic pension cost recognized and other comprehensive income $ 22 $ (168) Changes in benefit obligations recognized in accumulated other comprehensive income are as follows: December 31, (In thousands) 2020 2019 Amortization of prior service credit $ (84) $ (83) Net actuarial loss (gain) 496 374 Total recognized in accumulated other comprehensive income 412 291 Accrued post-retirement liability recognized $ 4,641 $ 4,039
Schedule of Principal Actuarial Assumptions	The principal actuarial assumptions used are as follows: December 31, 2020 2019 Projected benefit obligation Discount rate 2.35 % 3.15 % Net periodic pension cost Discount rate 3.15 % 4.16 % Long term rate of return on plan assets 7.00 % 7.00 %
Schedule of Fair Values of the Plan's Assets by Asset Category and Level Within the Fair Value Hierarchy	The fair value of the Plan’s assets by category within the fair value hierarchy are as follows at December 31, 2020 and December 31, 2019. The Plan did not hold any assets classified as Level 3, nor were there any transfers. December 31, 2020 Asset Category (In thousands) Total Level 1 Level 2 Equity Mutual Funds: Large-Cap $ 1,996 $ — $ 1,996 Mid-Cap 519 — 519 Small-Cap 500 — 500 International 1,049 — 1,049 Fixed Income - US Core 1,403 — 1,403 Intermediate Duration 470 — 470 Cash Equivalents - money market 112 38 74 Total $ 6,049 $ 38 $ 6,011 December 31, 2019 Asset Category (In thousands) Total Level 1 Level 2 Equity Mutual Funds: Large-Cap $ 1,900 $ — $ 1,900 Mid-Cap 453 — 453 Small-Cap 429 — 429 International 828 — 828 Fixed Income - US Core 1,535 — 1,535 Intermediate Duration 517 — 517 Cash Equivalents - money market 137 60 77 Total $ 5,799 $ 60 $ 5,739
Schedule of Estimated Benefit Payments	Estimated benefit payments under the pension plans over the next 10 years at December 31, 2020 are as follows: Year Payments (In thousands) 2021 370 2022 382 2023 367 2024 357 2025 - 2030 1,888 Estimated benefit payments under the post-retirement benefit plan over the next ten years at December 31, 2020 are as follows: Year Payments (In thousands) 2021 123 2022 121 2023 118 2024 117 2025 - 2030 642
Schedule of Amounts in Accumulated Other Comprehensive Income That Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost	The amounts in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit cost are as follows: December 31, (In thousands) 2020 2019 Net prior service cost (credit) $ 1,325 $ 1,409 Net actuarial loss (gain) 869 374 Total recognized in accumulated other comprehensive income $ 2,194 $ 1,783

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Components of Provision for Income Tax Expense	The components of the Company’s provision for income taxes for the years ended December 31, 2020, 2019, and 2018 were, as follows: (In thousands) 2020 2019 2018 Current: Federal tax (benefit)/expense $ (19,889) $ 16,576 $ 12,634 State tax (benefit)/expense (3,976) 5,323 4,114 Total current tax (benefit)/expense (1) (23,865) 21,899 16,748 Deferred: Federal tax expense 2,048 908 8,443 State tax expense/(benefit) 1,964 (344) 3,770 Total deferred tax expense 4,012 564 12,213 Change in valuation allowance — — — Income tax (benefit)/expense from continuing operations $ (19,853) $ 22,463 $ 28,961 Income tax (benefit) from discontinued operations (7,013) (1,468) (1,313) Total $ (26,866) $ 20,995 $ 27,648 (1) On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") was signed into law. The CARES Act includes several provisions that temporarily modify the corporate net operating loss (“NOL”) carryback rules for federal income tax purposes. Specifically, the CARES Act allows a five-year carryback of any NOL generated in a taxable year beginning after December 31, 2017, and before January 1, 2021. The Company recorded a $6 million federal income tax benefit in 2020 resulting from the carryback of its 2020 NOL to recover federal income taxes paid in 2015 through 2017 at a 35% federal income tax rate.
Schedule of Reconciliation of the Statutory Federal Income Tax Rate to Effective Tax Rate	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2020, 2019, and 2018: 2020 2019 2018 (In thousands, except rates) Amount Rate Amount Rate Amount Rate Statutory tax rate $ (111,936) 21.0 % $ 26,037 21.0 % $ 29,018 21.0 % Increase (decrease) resulting from: State taxes, net of federal tax benefit (1,589) 0.3 3,641 2.9 7,081 5.1 Tax exempt income - investments, net (3,184) 0.6 (3,527) (2.8) (3,620) (2.6) Bank-owned life insurance (1,283) 0.3 (1,305) (1.1) (1,337) (1.0) Goodwill impairment 103,912 (19.5) — — — — Non-deductible merger costs — — 122 0.1 181 0.1 Tax credits, net of basis reduction (1,812) 0.3 (3,531) (2.8) (3,574) (2.6) Tax rate benefit on net operating loss carryback (6,040) 1.1 — — — — Other, net 2,079 (0.4) 1,026 0.8 1,212 0.9 Effective tax rate $ (19,853) 3.7 % $ 22,463 18.1 % $ 28,961 20.9 %
Schedule of Components of Deferred Tax Assets and Liabilities	As of December 31, 2020 and 2019, significant components of the Company’s deferred tax assets and liabilities were, as follows: (In thousands) 2020 2019 Deferred tax assets: Allowance for credit losses $ 35,650 $ 17,446 Unrealized capital loss on tax credit investments 2,360 6,195 Employee benefit plans 7,607 10,565 Purchase accounting adjustments 8,843 39,359 Net operating loss carryforwards 1,753 951 Lease liability 20,119 22,497 Premises and equipment 1,097 739 Nonaccrual interest 1,780 587 Other 1,733 501 Deferred tax assets, net before valuation allowances 80,942 98,840 Valuation allowance (200) (200) Deferred tax assets, net of valuation allowances $ 80,742 $ 98,640 Deferred tax liabilities: Net unrealized gain on securities available for sale and pension in OCI $ (10,602) $ (4,244) Loan servicing rights (1,674) (4,669) Deferred loan fees (368) (1,667) Intangible amortization (2,277) (18,557) Unamortized tax credit reserve (1,086) (1,142) Right-of-use asset (18,365) (20,614) Deferred tax liabilities $ (34,372) $ (50,893) Deferred tax assets, net $ 46,370 $ 47,747 Deferred tax liabilities from discontinued operations $ — $ (3,418) Deferred tax assets, net from continuing operations $ 46,370 $ 51,165
Schedule of Components of the Valuation Allowance on Deferred Tax Asset	The components of the Company’s valuation allowance on its deferred tax asset, net as of December 31, 2020 and 2019 were, as follows: (in thousands) 2020 2019 State tax basis difference, net of Federal tax benefit $ (200) $ (200) Valuation allowances $ (200) $ (200)
Schedule of Changes in Unrecognized Tax Benefits	The following table presents changes in unrecognized tax benefits for the years ended December 31, 2020, 2019, and 2018: (In thousands) 2020 2019 2018 Unrecognized tax benefits at January 1 $ 238 $ 467 $ 304 Increase in gross amounts of tax positions related to prior years 309 26 533 Decrease in gross amounts of tax positions related to prior years — — (370) Decrease due to settlement with taxing authority — (185) — Decrease due to lapse in statute of limitations (31) (70) — Unrecognized tax benefits at December 31 $ 516 $ 238 $ 467

DERIVATIVE INSTRUMENTS AND HE_2

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Swap Agreements and Non-hedging Derivative Assets and Liabilities	Information about interest rate swap agreements and non-hedging derivative assets and liabilities at December 31, 2020 follows: Notional Weighted Weighted Average Rate Estimated December 31, 2020 Received Contract pay rate (In thousands) (In years) (In thousands) Economic hedges: Interest rate swap on tax advantaged economic development bond $ 8,654 8.9 0.52 % 5.09 % $ (1,778) Interest rate swaps on loans with commercial loan customers 1,734,978 6.1 4.15 % 1.95 % 159,016 Reverse interest rate swaps on loans with commercial loan customers 1,734,978 6.1 1.95 % 4.15 % (64,645) Risk participation agreements with dealer banks 326,862 8.0 665 Forward sale commitments 11,544 0.2 320 Total economic hedges 3,817,016 93,578 Non-hedging derivatives: Commitments to lend 40,099 0.2 735 Total non-hedging derivatives 40,099 735 Total $ 3,857,115 $ 94,313 Information about interest rate swap agreements and non-hedging derivative asset and liabilities at December 31, 2019 follows: Notional Weighted Weighted Average Rate Estimated December 31, 2019 Received Contract pay rate (In thousands) (In years) (In thousands) Economic hedges: Interest rate swap on tax advantaged economic development bond $ 9,390 9.9 2.08 % 5.09 % $ (1,488) Interest rate swaps on loans with commercial loan customers 1,669,895 6.4 4.38 % 3.28 % 75,326 Reverse interest rate swaps on loans with commercial loan customers 1,669,895 6.4 3.28 % 4.38 % (77,051) Risk participation agreements with dealer banks 315,140 7.5 320 Forward sale commitments (1) 237,412 0.2 (227) Total economic hedges 3,901,732 (3,120) Non-hedging derivatives: Commitments to lend (1) 168,997 0.2 2,628 Total non-hedging derivatives 168,997 2,628 Total $ 4,070,729 $ (492) (1) Includes the impact of discontinued operations.
Schedule of Amounts Included in the Consolidated Statements of Income Related to Economic Hedges and Non-hedging Derivatives	Amounts included in the Consolidated Statements of Operations related to economic hedges and non-hedging derivatives were as follows: Years Ended December 31, (In thousands) 2020 2019 2018 Economic hedges Interest rate swap on industrial revenue bond: Unrealized (loss)/gain recognized in other non-interest income $ (289) $ (248) $ 409 Interest rate swaps on loans with commercial loan customers: Unrealized gain/(loss) recognized in other non-interest income 85,206 65,098 8,758 (Unfavorable) change in credit valuation adjustment recognized in other non-interest income (1,516) (1,214) (519) Reverse interest rate swaps on loans with commercial loan customers: Unrealized (loss)/gain recognized in other non-interest income (85,206) (65,098) (8,758) Risk Participation Agreements: Unrealized gain/(loss) recognized in other non-interest income 345 83 263 Forward Commitments: Unrealized gain/(loss) recognized in discontinued operations 547 507 (611) Realized (loss) in discontinued operations (8,205) (9,195) (1,532) Non-hedging derivatives Commitments to lend: Unrealized (loss)/gain recognized in discontinued operations $ (1,893) $ (1,299) $ 3,358 Realized gain in discontinued operations 15,672 57,699 33,982
Schedule of Assets Subject to an Enforceable Master Netting Arrangement	The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of December 31, 2020 and December 31, 2019: Offsetting of Financial Assets and Derivative Assets Gross Gross Amounts Net Amounts of Assets Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2020 Interest Rate Swap Agreements: Institutional counterparties $ 1,124 $ (78) $ 1,046 $ — $ — $ 1,046 Commercial counterparties 159,016 — 159,016 — — 159,016 Total $ 160,140 $ (78) $ 160,062 $ — $ — $ 160,062 Offsetting of Financial Assets and Derivative Assets Gross Gross Amounts Net Amounts of Assets Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2019 Interest Rate Swap Agreements: Institutional counterparties $ 640 $ (54) $ 586 $ — $ — $ 586 Commercial counterparties 76,428 (22) 76,406 — — 76,406 Total $ 77,068 $ (76) $ 76,992 $ — $ — $ 76,992
Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement	Offsetting of Financial Liabilities and Derivative Liabilities Gross Gross Amounts Net Amounts of Liabilities Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2020 Interest Rate Swap Agreements: Institutional counterparties $ (164,543) $ 97,740 $ (66,803) $ 37,815 $ 75,070 $ 46,082 Commercial counterparties — — — — — — Total $ (164,543) $ 97,740 $ (66,803) $ 37,815 $ 75,070 $ 46,082 Offsetting of Financial Liabilities and Derivative Liabilities Gross Gross Amounts Net Amounts of Liabilities Gross Amounts Not Offset in the Statements Financial Cash (in thousands) Net Amount As of December 31, 2019 Interest Rate Swap Agreements: Institutional counterparties $ (80,024) $ 1,219 $ (78,805) $ 25,828 $ 96,310 $ 43,333 Commercial counterparties (1,080) — (1,080) — — (1,080) Total $ (81,104) $ 1,219 $ (79,885) $ 25,828 $ 96,310 $ 42,253

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of ROU Assets and Lease Liabilities	The following table represents the Consolidated Balance Sheets classification of the Company’s right-of-use (“ROU”) assets and lease liabilities: (In thousands) December 31, 2020 December 31, 2019 Lease Right-of-Use Assets Classification Operating lease right-of-use assets (1) Other assets $ 60,018 $ 76,332 Finance lease right-of-use assets Premises and equipment, net 7,197 7,720 Total Lease Right-of-Use Assets $ 67,215 $ 84,052 Lease Liabilities Operating lease liabilities (2) Other liabilities $ 63,894 $ 80,734 Finance lease liabilities Other liabilities 10,383 10,883 Total Lease Liabilities $ 74,277 $ 91,617 (1) There are no operating lease right-of-use assets classified as discontinued operations as of December 31, 2020. There are operating lease right-of-use assets classified as discontinued operations of $3.5 million as of December 31, 2019. (2) There are no operating lease liabilities classified as discontinued operations as of December 31, 2020. There are operating lease liabilities classified as discontinued operations of $3.5 million as of December 31, 2019. Supplemental information related to leases was as follows: December 31, 2020 December 31, 2019 Weighted-Average Remaining Lease Term (in years) Operating leases 9.8 10.3 Finance leases 13.8 14.8 Weighted-Average Discount Rate Operating leases 2.81 % 3.36 % Finance leases 5.00 % 5.00 % 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 does not have any material sub-lease agreements. Lease expense for operating leases for the year ended December 31, 2020 was $13.5 million, of which $1.2 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. Lease expense for operating leases for the year ended December 31, 2019 was $14.4 million, of which $2.8 million was related to FCLS and is reported as discontinued operations. Variable lease components, such as consumer price index adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities.
Summary of Supplemental Cash Flow Information Related to Leases	(In thousands) December 31, 2020 December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases (1) $ 13,750 $ 14,731 Operating cash flows from finance leases 530 553 Financing cash flows from finance leases 500 435 Right-of-use assets obtained in exchange for lease obligations: Operating leases (1) 7,083 88,079 Finance leases — — (1) Includes operating cash flows from operating leases related to discontinued operations of $1.2 million and $2.8 million at December 31, 2020 and December 31, 2019, respectively.
Schedule of Maturity Analysis of Operating Lease Liability	The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2020: (In thousands) Operating Leases Finance Leases 2021 $ 10,875 $ 1,023 2022 9,990 1,031 2023 8,752 1,037 2024 7,508 1,037 2025 5,668 1,037 Thereafter 31,215 9,223 Total undiscounted lease payments 74,008 14,388 Less amounts representing interest (10,114) (4,005) Lease liability $ 63,894 $ 10,383
Schedule of Maturity Analysis of Finance Lease Liability	The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2020: (In thousands) Operating Leases Finance Leases 2021 $ 10,875 $ 1,023 2022 9,990 1,031 2023 8,752 1,037 2024 7,508 1,037 2025 5,668 1,037 Thereafter 31,215 9,223 Total undiscounted lease payments 74,008 14,388 Less amounts representing interest (10,114) (4,005) Lease liability $ 63,894 $ 10,383
Schedule of Lease Supplemental Information	Supplemental information related to leases was as follows: December 31, 2020 December 31, 2019 Weighted-Average Remaining Lease Term (in years) Operating leases 9.8 10.3 Finance leases 13.8 14.8 Weighted-Average Discount Rate Operating leases 2.81 % 3.36 % Finance leases 5.00 % 5.00 %

OTHER COMMITMENTS, CONTINGENC_2

OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of Financial Instruments Outstanding Whose Contract Amounts Represent Credit Risk	A summary of financial instruments outstanding whose contract amounts represent credit risk is as follows at year-end: (In thousands) 2020 2019 Commitments to originate new loans (1) $ 211,485 $ 143,812 Unused funds on commercial and other lines of credit 944,678 850,761 Unadvanced funds on home equity lines of credit 371,080 384,723 Unadvanced funds on construction and real estate loans 226,736 440,599 Standby letters of credit 24,501 15,527 Total $ 1,778,480 $ 1,835,422 (1) As of December 31, 2020, there were no commitments to originate new loans related to discontinued operations. As of December 31, 2019, commitments to originate new loans include $132.7 million related to discontinued operations.

SHAREHOLDERS' EQUITY AND EARN_2

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Tables)	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Schedule of Actual and Required Capital Ratios	The Company and Bank’s actual and required capital amounts were as follows: Minimum Minimum to be Well Actual (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2020 Company (Consolidated) Total capital to risk-weighted assets $ 1,337,008 16.10 % $ 664,239 8.00 % N/A N/A Common Equity Tier 1 Capital to risk weighted assets 1,145,329 13.79 373,634 4.50 N/A N/A Tier 1 capital to risk-weighted assets 1,167,512 14.06 498,179 6.00 N/A N/A Tier 1 capital to average assets 1,167,512 9.38 332,119 4.00 N/A N/A Bank Total capital to risk-weighted assets $ 1,243,287 14.99 % $ 663,429 8.00 % $ 961,659 10.00 % Common Equity Tier 1 Capital to risk weighted assets 1,148,205 13.85 373,179 4.50 625,079 6.50 Tier 1 capital to risk-weighted assets 1,148,205 13.85 497,572 6.00 769,327 8.00 Tier 1 capital to average assets 1,148,205 9.23 331,715 4.00 480,830 5.00 December 31, 2019 Company (Consolidated) Total capital to risk-weighted assets $ 1,321,910 13.73 % $ 770,294 8.00 % N/A N/A Common Equity Tier 1 Capital to risk weighted assets 1,161,800 12.07 433,290 4.50 N/A N/A Tier 1 capital to risk-weighted assets 1,183,932 12.30 577,720 6.00 N/A N/A Tier 1 capital to average assets 1,183,932 9.33 385,147 4.00 N/A N/A Bank Total capital to risk-weighted assets $ 1,233,278 12.82 % $ 769,327 8.00 % $ 961,659 10.00 % Common Equity Tier 1 Capital to risk weighted assets 1,169,535 12.16 432,747 4.50 625,079 6.50 Tier 1 capital to risk-weighted assets 1,169,535 12.16 576,996 6.00 769,327 8.00 Tier 1 capital to average assets 1,169,535 9.14 384,664 4.00 480,830 5.00
Schedule of Components of Accumulated Other Comprehensive (Loss)/Income	Year-end components of accumulated other comprehensive income are as follows: (In thousands) 2020 2019 Other accumulated comprehensive income/(loss), before tax: Net unrealized holding gain/(loss) on AFS securities $ 44,988 $ 19,262 Net unrealized holding (loss) on pension plans (3,511) (3,022) Income taxes related to items of accumulated other comprehensive (loss)/income: Net unrealized holding (gain)/loss on AFS securities (11,530) (5,059) Net unrealized holding loss on pension plans 924 812 Accumulated other comprehensive income $ 30,871 $ 11,993
Schedule of Components of Other Comprehensive (Loss)/Income	The following table presents the components of other comprehensive (loss)/income for the years ended December 31, 2020, 2019, and 2018: (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2020 Net unrealized holding gain on AFS securities: Net unrealized gain arising during the period $ 25,721 $ (6,470) $ 19,251 Less: reclassification adjustment for (losses) realized in net income (5) 1 (4) Net unrealized holding gain on AFS securities 25,726 (6,471) 19,255 Net unrealized holding (loss) on pension plans Net unrealized (loss) arising during the period (489) 112 (377) Less: reclassification adjustment for (losses) realized in net income — — — Net unrealized holding (loss) on pension plans (489) 112 (377) Other comprehensive gain $ 25,237 $ (6,359) $ 18,878 (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2019 Net unrealized holding gain on AFS securities: Net unrealized gain arising during the period $ 34,591 $ (8,890) $ 25,701 Less: reclassification adjustment for gains realized in net income 61 (17) 44 Net unrealized holding gain on AFS securities 34,530 (8,873) 25,657 Net unrealized holding (loss) on pension plans Net unrealized (loss) arising during the period (270) 76 (194) Less: reclassification adjustment for (losses) realized in net income — — — Net unrealized holding (loss) on pension plans (270) 76 (194) Other comprehensive gain $ 34,260 $ (8,797) $ 25,463 Less: reclassification related to adoption of ASU 2016-01 — — — Less: reclassification related to adoption of ASU 2018-02 — — — Total change to accumulated other comprehensive (loss) $ 34,260 $ (8,797) $ 25,463 (In thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2018 Net unrealized holding (loss) on AFS securities: Net unrealized (loss) arising during the period $ (16,917) $ 4,419 $ (12,498) Less: reclassification adjustment for gains realized in net income 6 (2) 4 Net unrealized holding (loss) on AFS securities (16,923) 4,421 (12,502) Net unrealized holding (loss) on pension plans Net unrealized gain arising during the period 135 (54) 81 Less: reclassification adjustment for (losses) realized in net income (201) 54 (147) Net unrealized holding loss on pension plans 336 (108) 228 Other comprehensive (loss) $ (16,587) $ 4,313 $ (12,274) Less: reclassification related to adoption of ASU 2016-01 8,379 (2,126) 6,253 Less: reclassification related to adoption of ASU 2018-02 — (896) (896) Total change to accumulated other comprehensive (loss) $ (24,966) $ 7,335 $ (17,631)
Schedule of Gross Changes in Each Component of Accumulated Other Comprehensive (Loss)/Income	The following table presents the changes in each component of accumulated other comprehensive income/(loss), for the years ended December 31, 2020, 2019, and 2018: (in thousands) Net unrealized holding gain (loss) on AFS Securities Net unrealized holding gain (loss) on pension plans Total Year Ended December 31, 2020 Balance at Beginning of Year $ 14,204 $ (2,211) $ 11,993 Other comprehensive gain/(loss) before reclassifications 19,251 (377) 18,874 Amounts reclassified from accumulated other comprehensive income (4) — (4) Total other comprehensive income/(loss) 19,255 (377) 18,878 Balance at End of Period $ 33,459 $ (2,588) $ 30,871 Year Ended December 31, 2019 Balance at Beginning of Year $ (11,453) $ (2,017) $ (13,470) Other comprehensive gain/(loss) before reclassifications 25,701 (194) 25,507 Amounts reclassified from accumulated other comprehensive income 44 — 44 Total other comprehensive income/(loss) 25,657 (194) 25,463 Balance at End of Period $ 14,204 $ (2,211) $ 11,993 Year Ended December 31, 2018 Balance at Beginning of Year $ 6,008 $ (1,847) $ 4,161 Other comprehensive (loss)/income before reclassifications (12,498) 81 (12,417) Amounts reclassified from accumulated other comprehensive income 4 (147) (143) Total other comprehensive (loss)/income (12,502) 228 (12,274) Less: amounts reclassified from accumulated other 4,959 398 5,357 Balance at End of Period $ (11,453) $ (2,017) $ (13,470)
Schedule of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive (Loss)/Income	The following table presents the amounts reclassified out of each component of accumulated other comprehensive (loss)/income for the years ended December 31, 2020, 2019, and 2018: Affected Line Item in the Years Ended December 31, (in thousands) 2020 2019 2018 Realized (losses)/gains on AFS securities: $ (5) $ 61 $ 6 Non-interest income 1 (17) (2) Tax expense (4) 44 4 Realized (losses) on pension plans — — (201) Non-interest expense — — 54 Tax expense — — (147) Total reclassifications for the period $ (4) $ 44 $ (143)
Schedule of Earnings Per Share	(Loss)/earnings per common share has been computed based on the following (average diluted shares outstanding is calculated using the treasury stock method): Years Ended December 31, (In thousands, except per share data) 2020 2019 2018 Net (loss)/income from continuing operations $ (513,175) $ 101,521 $ 109,219 Net (loss) from discontinued operations (19,842) (4,071) (3,454) Net (loss)/income $ (533,017) $ 97,450 $ 105,765 Average number of common shares issued 51,903 49,782 46,212 Less: average number of treasury shares 1,569 1,142 810 Less: average number of unvested stock award shares 505 420 421 Plus: average participating preferred shares 441 1,043 1,043 Average number of basic common shares outstanding 50,270 49,263 46,024 Plus: dilutive effect of unvested stock award shares — 122 180 Plus: dilutive effect of stock options outstanding — 36 27 Average number of diluted common shares outstanding 50,270 49,421 46,231 Basic (loss)/earnings per share: Continuing Operations $ (10.21) $ 2.06 $ 2.38 Discontinued operations (0.39) (0.08) (0.08) Basic (loss)/earnings per common share $ (10.60) $ 1.98 $ 2.30 Diluted (loss)/earnings per share: Continuing Operations $ (10.21) $ 2.05 $ 2.36 Discontinued operations (0.39) (0.08) (0.07) Diluted (loss)/earnings per common share $ (10.60) $ 1.97 $ 2.29

STOCK-BASED COMPENSATION PLANS

STOCK-BASED COMPENSATION PLANS (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary of Activity in the Stock Award and Stock Option Plans	A summary of activity in the Company’s stock compensation plans is shown below: Non-vested Stock Stock Options Outstanding (Shares in thousands) Number of Shares Weighted- Average Number of Shares Weighted- Average Exercise Price Balance, December 31, 2019 450 $ 32.47 153 $ 22.00 Granted 314 16.69 — — Acquired — — — — Stock options exercised — — (37) 17.85 Stock awards vested (156) 33.18 — — Forfeited (91) 29.86 — — Expired — — (4) 11.99 Balance, December 31, 2020 517 $ 28.35 112 $ 22.95

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Summary of Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis Segregated by the Level of the Valuation Inputs within the Fair Value Hierarchy Utilized to Measure Fair Value	The following table summarizes assets and liabilities measured at fair value on a recurring basis as of year-end 2020 and 2019 segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: December 31, 2020 (In thousands) Level 1 Level 2 Level 3 Total Trading security $ — $ — $ 9,708 $ 9,708 Available-for-sale securities: Municipal bonds and obligations — 97,803 — 97,803 Agency collateralized mortgage obligations — 756,826 — 756,826 Agency residential mortgage-backed securities — 438,132 — 438,132 Agency commercial mortgage-backed securities — 288,650 — 288,650 Corporate bonds — 45,030 15,000 60,030 Other bonds and obligations — 53,791 — 53,791 Marketable equity securities 17,841 672 — 18,513 Loans held for investment — — 2,265 2,265 Loans held for sale — 12,992 4,756 17,748 Derivative assets — 159,016 1,055 160,071 Capitalized servicing rights — — 3,033 3,033 Derivative liabilities — 65,758 — 65,758 December 31, 2019 (In thousands) Level 1 Level 2 Level 3 Total Trading security $ — $ — $ 10,769 $ 10,769 Available-for-sale securities: Municipal bonds and obligations — 110,138 — 110,138 Agency collateralized mortgage obligations — 748,812 — 748,812 Agency residential mortgage-backed securities — 147,744 — 147,744 Agency commercial mortgage-backed securities — 147,096 — 147,096 Corporate bonds — 73,610 42,966 116,576 Other bonds and obligations — 41,189 — 41,189 Marketable equity securities 40,499 1,057 — 41,556 Loans held for sale (1) — 140,280 — 140,280 Derivative assets (1) — 77,562 2,628 80,190 Capitalized servicing rights (1) — — 12,299 12,299 Derivative liabilities (1) 227 80,454 — 80,681
Schedule of Loans Held for Sale	The cash flow assumptions include payment schedules for loans with current payment histories and estimated collateral value for delinquent loans. All of these loans were nonperforming as of December 31, 2020. Aggregate Fair Value December 31, 2020 Aggregate Aggregate Less Aggregate (In thousands) Fair Value Unpaid Principal Unpaid Principal Loans held for investment at fair value $ 2,265 $ 53,945 $ (51,680) Loans held for sale. The Company elected the fair value option for all mortgage loans originated for sale (HFS) that were originated for sale on or after May 1, 2012. Loans HFS are classified as Level 2 as the fair value is based on input factors such as quoted prices for similar loans in active markets. Aggregate Aggregate Aggregate Fair Value December 31, 2020 (In thousands) Loans held for sale - continuing operations $ 12,992 $ 12,639 $ 353 Loans held for sale - discontinued operations — — — Loans held for sale $ 12,992 $ 12,639 $ 353 Aggregate Aggregate Aggregate Fair Value December 31, 2019 (In thousands) Loans held for sale - continuing operations $ 7,625 $ 7,485 $ 140 Loans held for sale - discontinued operations 132,655 129,622 3,033 Loans held for sale $ 140,280 $ 137,107 $ 3,173
Schedule of Changes in Level 3 Assets and Liabilities that were Measured at Fair Value on a Recurring Basis	The table below presents the changes in Level 3 assets that were measured at fair value on a recurring basis at year-end 2020 and 2019: Assets (Liabilities) (In thousands) Trading Securities Available for Sale Loans Held for Investment Commitments to Lend (1) Forward Capitalized Servicing Rights (1) Balance as of December 31, 2018 $ 11,212 $ — $ — $ 3,927 $ — $ 11,485 Unrealized (loss), net recognized in other non-interest income 258 — — — — — Unrealized gain/(loss), net recognized in discontinued — — — 55,771 — (10,322) Unrealized gain included in accumulated other comprehensive loss — (162) — — — — Transfers to Level 3 — 43,128 — — — — Paydown of trading security (701) — — — — — Transfers to loans held for sale — — — (57,070) — — Additions to servicing rights — — — — — 11,136 Balance as of December 31, 2019 $ 10,769 $ 42,966 $ — $ 2,628 $ — $ 12,299 Adoption of ASC 326 — — 7,660 — — — Maturities, calls, and prepayments of AFS Security — (30,000) — — — Unrealized (loss) gain, net recognized in other non-interest income (327) — (1,283) — — (822) Unrealized gain/(loss), net recognized in discontinued — — — 16,565 320 (8,444) Unrealized (loss) included in accumulated other comprehensive loss — 2,034 — — — — Transfers to Level 3 — — — — — — Paydown of asset (734) — (4,112) — — — Transfers to loans held for sale — — (18,458) — — Additions to servicing rights — — — — — Balance as of December 31, 2020 $ 9,708 $ 15,000 $ 2,265 $ 735 $ 320 $ 3,033 Unrealized gains/(losses) relating to instruments still held at December 31, 2020 $ 1,053 $ 287 $ — $ 735 $ 320 $ — Unrealized gains/(losses) relating to instruments still held at December 31, 2019 $ 1,379 $ (162) $ — $ 2,628 $ — $ — (1) For 2019, these assets were classified as assets from discontinued operations on the consolidated balance sheets.
Summary of Applicable Non-recurring Fair Value Measurements	The following tables summarize the estimated fair values, which represent exit price, and related carrying amounts, of the Company’s financial instruments. Certain financial instruments and all non-financial instruments are excluded from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein may not necessarily represent the underlying fair value of the Company. Certain assets and liabilities in the following disclosures include balances classified as discontinued operations. See Note 2 - Discontinued Operations for more information on assets and liabilities classified as discontinued operations. December 31, 2020 Carrying Fair (In thousands) Level 1 Level 2 Level 3 Financial Assets Cash and cash equivalents $ 1,557,875 $ 1,557,875 $ 1,557,875 $ — $ — Trading security 9,708 9,708 — — 9,708 Marketable equity securities 18,513 18,513 17,841 672 — Securities available for sale 1,695,232 1,695,232 — 1,680,232 15,000 Securities held to maturity 465,091 491,855 — 488,393 3,462 FHLB stock and restricted equity securities 34,873 N/A N/A N/A N/A Net loans 7,954,217 8,243,437 — — 8,243,437 Loans held for sale 17,748 17,748 — 12,992 4,756 Accrued interest receivable 46,919 46,919 — 46,919 — Derivative assets 160,071 160,071 — 159,016 1,055 Assets held for sale 317,304 317,304 — 16,705 300,599 Financial Liabilities Total deposits 10,215,808 10,230,822 — 10,230,822 — Short-term debt 40,000 40,025 — 40,025 — Long-term FHLB advances 434,357 438,064 — 438,064 — Subordinated notes 97,280 95,178 — 95,178 — Derivative liabilities 65,758 65,758 — 65,758 — Liabilities held for sale 630,065 631,268 — 631,268 — December 31, 2019 Carrying Fair (In thousands) Level 1 Level 2 Level 3 Financial Assets Cash and cash equivalents $ 579,829 $ 579,829 $ 579,829 $ — $ — Trading security 10,769 10,769 — — 10,769 Marketable equity securities 41,556 41,556 40,500 1,056 — Securities available for sale 1,311,555 1,311,555 — 1,267,573 43,982 Securities held to maturity 357,979 373,277 — 355,513 17,764 FHLB stock and restricted equity securities 48,019 N/A N/A N/A N/A Net loans 9,438,853 9,653,550 — — 9,653,550 Loans held for sale (1) 169,319 169,319 — 140,280 29,039 Accrued interest receivable 36,462 36,462 — 36,462 — Derivative assets (1) 80,190 80,190 — 77,562 2,628 Financial Liabilities Total deposits 10,335,977 10,338,993 — 10,338,993 — Short-term debt 125,000 125,081 — 125,081 — Long-term FHLB advances 605,501 606,381 — 606,381 — Subordinated notes 97,049 101,055 — 101,055 — Derivative liabilities (1) 80,681 80,681 227 80,454 — (1) Includes assets and liabilities classified as discontinued operations.
Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Schedule of Quantitative Information about the Significant Unobservable Inputs within Level 3	Quantitative information about the significant unobservable inputs within Level 3 recurring assets/(liabilities) as of December 31, 2020 and 2019 are as follows: Fair Value Significant Unobservable Input Value (In thousands) December 31, 2020 Valuation Techniques Unobservable Inputs Assets Trading Security $ 9,708 Discounted Cash Flow Discount Rate 2.72 % Securities Available for Sale 15,000 Indication from Market Maker Price 102.00 % Loans held for investment 2,265 Discounted Cash Flow Discount Rate 30.00 % Collateral Value $8.1 - $21.9 Commitments to Lend 735 Historical Trend Closing Ratio 74.54 % Pricing Model Origination Costs, per loan $ 3 Forward Commitments 320 Historical Trend Closing Ratio 74.54 % Pricing Model Origination Costs, per loan $ 3 Capitalized Servicing Rights 3,033 Discounted cash flow Constant prepayment rate (CPR) 26.52 % Discount rate 10.00 % Total $ 31,061 Fair Value Significant (In thousands) December 31, 2019 Valuation Techniques Unobservable Inputs Assets Trading Security $ 10,769 Discounted Cash Flow Discount Rate 2.21 % Securities Available for Sale 42,966 Indication from Market Maker Price 97.00% - 100.00% Commitments to Lend (1) 2,628 Historical Trend Closing Ratio 77.81 % Pricing Model Origination Costs, per loan $ 3 Capitalized Servicing Rights (1) 12,299 Discounted cash flow Constant prepayment rate (CPR) 11.50 % Discount rate 10.00 % Total $ 68,662 (1) Classified as assets from discontinued operations on the consolidated balance sheets.
Non-recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Schedule of Quantitative Information about the Significant Unobservable Inputs within Level 3	The following is a summary of applicable non-recurring fair value measurements. There are no liabilities measured on a non-recurring basis. December 31, 2020 Fair Value Measurements as of December 31, 2018 (In thousands) Level 3 Level 3 Assets Individually evaluated loans $ 28,028 December 2020 Capitalized servicing rights 13,315 December 2020 Other real estate owned 149 December 2020 Total $ 41,492 December 31, 2019 Fair Value Measurements as of December 31, 2017 (In thousands) Level 3 Level 3 Assets Individually evaluated loans $ 8,831 December 2019 Capitalized servicing rights 14,152 December 2019 Total $ 22,983 Quantitative information about the significant unobservable inputs within Level 3 non-recurring assets as of December 31, 2020 and 2019 are as follows: (in thousands) December 31, 2020 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets Individually evaluated loans $ 28,028 Fair value of collateral Loss severity 0.07% to 100.00% (46.36%) Appraised value $0 to $11,432 ($9,800) Capitalized servicing rights 13,315 Discounted cash flow Constant prepayment rate (CPR) 14.49% to 23.29% (16.98%) Discount rate 10.00% to 11.00% (10.56%) Other real estate owned 149 Fair value of collateral Appraised value $94 - $182 Total Assets $ 41,492 (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. (in thousands) December 31, 2019 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets Individually evaluated loans $ 8,831 Fair value of collateral Loss severity 15.72% to 0.12% (4.50%) Appraised value $8 to $1,548 ($736) Capitalized servicing rights 14,152 Discounted cash flow Constant prepayment rate (CPR) 9.44% to 14.12% (12.25%) Discount rate 10.00% to 13.50% (11.78%) Total Assets $ 22,983 (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties.

CONDENSED FINANCIAL STATEMENT_2

CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Balance Sheets	CONDENSED BALANCE SHEETS December 31, (In thousands) 2020 2019 Assets Cash due from Berkshire Bank $ 83,510 $ 74,153 Investment in subsidiaries 1,202,755 1,777,717 Marketable equity securities, at fair value 158 4,840 Other assets 188 438 Total assets $ 1,286,611 $ 1,857,148 Liabilities and Shareholders’ Equity Subordinated notes $ 97,280 $ 97,049 Accrued expenses 1,558 1,535 Shareholders’ equity 1,187,773 1,758,564 Total liabilities and shareholders’ equity $ 1,286,611 $ 1,857,148
Schedule of Condensed Statements of Income	CONDENSED STATEMENTS OF OPERATIONS Years Ended December 31, (In thousands) 2020 2019 2018 Income: Dividends from subsidiaries $ 46,300 $ 104,700 $ 48,500 Other (2,185) 1,258 506 Total income 44,115 105,958 49,006 Interest expense 5,335 5,335 5,335 Non-interest expenses 2,866 4,129 3,034 Total expense 8,201 9,464 8,369 Income before income taxes and equity in undistributed income of subsidiaries 35,914 96,494 40,637 Income tax (benefit) (2,719) (2,054) (1,068) Income before equity in undistributed income of subsidiaries 38,633 98,548 41,705 Equity in undistributed results of operations of subsidiaries (571,650) (1,098) 64,060 Net (loss)/income (533,017) 97,450 105,765 Preferred stock dividend 313 960 918 (Loss)/income available to common shareholders $ (533,330) $ 96,490 $ 104,847 Comprehensive (loss)/income $ (514,139) $ 122,912 $ 88,133
Schedule of Condensed Statements of Cash Flows	CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities: Net (loss)/income $ (533,017) $ 97,450 $ 105,765 Adjustments to reconcile net income to net cash (used) provided by operating activities: Equity in undistributed results of operations of subsidiaries 571,650 1,098 (64,060) Other, net 2,603 (4,457) 20,916 Net cash provided by operating activities 41,236 94,091 62,621 Cash flows from investing activities: Advances to subsidiaries — — (85,000) Purchase of securities (489) — (128) Sale of securities 4,658 6,989 13,550 Other, net — 987 — Net cash provided/(used) by investing activities 4,169 7,976 (71,578) Cash flows from financing activities: Proceed from issuance of short term debt 231 431 178 Proceed from repayment of long term debt — — 35,000 Net proceeds from common stock — — 325 Payment to repurchase common stock (473) (52,746) — Common stock cash dividends paid (36,251) (44,147) (39,966) Preferred stock cash dividends paid (313) (960) (918) Other, net 758 188 278 Net cash (used) in financing activities (36,048) (97,234) (5,103) Net change in cash and cash equivalents 9,357 4,833 (14,060) Cash and cash equivalents at beginning of year 74,153 69,320 83,380 Cash and cash equivalents at end of year $ 83,510 $ 74,153 $ 69,320

QUARTERLY DATA (UNAUDITED) (Tab

QUARTERLY DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Results of Operations	Quarterly results of operations were as follows: 2020 2019 (In thousands, except per share data) Fourth Quarter Third Quarter Second Quarter First Quarter Fourth Quarter Third Quarter Second Quarter First Quarter Interest and dividend income $ 92,131 $ 97,768 $ 103,688 $ 116,195 $ 125,441 $ 133,725 $ 129,238 $ 121,109 Interest expense 16,422 20,713 26,098 29,767 34,108 36,854 37,643 35,650 Net interest income 75,709 77,055 77,590 86,428 91,333 96,871 91,595 85,459 Non-interest income 23,327 19,963 17,381 5,636 23,362 21,406 17,512 21,722 Total revenue 99,036 97,018 94,971 92,064 114,695 118,277 109,107 107,181 Provision for loan losses 10,000 1,200 29,871 34,807 5,351 22,600 3,467 4,001 Non-interest expense 71,796 72,843 624,275 71,325 70,287 71,011 76,568 71,991 Income/(loss) from continuing operations before income taxes 17,240 22,975 (559,175) (14,068) 39,057 24,666 29,072 31,189 Income tax (benefit)/expense (1,659) (68) (16,130) (1,996) 6,421 4,007 5,118 6,917 Net income/(loss) from continuing operations 18,899 23,043 (543,045) (12,072) 32,636 20,659 23,954 24,272 (Loss)/income from discontinued operations, net of tax (3,890) (1,818) (6,336) (7,798) (6,885) 1,957 1,494 (637) Net income/(loss) $ 15,009 $ 21,225 $ (549,381) $ (19,870) $ 25,751 $ 22,616 $ 25,448 $ 23,635 Basic earnings/(loss) per share: Continuing operations $ 0.38 $ 0.46 $ (10.80) $ (0.24) $ 0.65 $ 0.40 $ 0.49 $ 0.52 Discontinued operations (0.08) (0.04) (0.13) (0.16) (0.14) 0.04 0.03 (0.01) Basic earnings/(loss) per common share $ 0.30 $ 0.42 $ (10.93) $ (0.40) $ 0.51 $ 0.44 $ 0.52 $ 0.51 Diluted earnings/(loss) per share: Continuing operations $ 0.38 $ 0.46 $ (10.80) $ (0.24) $ 0.65 $ 0.40 $ 0.49 $ 0.52 Discontinued operations (0.08) (0.04) (0.13) (0.16) (0.14) 0.04 0.03 (0.01) Diluted earnings/(loss) per share $ 0.30 $ 0.42 $ (10.93) $ (0.40) $ 0.51 $ 0.44 $ 0.52 $ 0.51 Weighted average common shares outstanding: Basic 50,308 50,329 50,246 50,204 50,494 51,422 48,961 46,113 Diluted 50,355 50,329 50,246 50,204 50,702 51,545 49,114 46,261

NET INTEREST INCOME AFTER PRO_2

NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES (Tables)	12 Months Ended
	Dec. 31, 2020
Banking and Thrift, Interest [Abstract]
Schedule of Net Interest Income After Provision for Loan Losses	Presented below is net interest income after provision for credit losses for the three years ended 2020, 2019, and 2018, respectively: Years Ended December 31, (In thousands) 2020 2019 2018 Net interest income $ 316,782 $ 365,258 $ 356,200 Provision for credit losses 75,878 35,419 25,451 Net interest income after provision for credit losses 240,904 329,839 330,749 Total non-interest income 66,307 84,002 74,324 Total non-interest expense 840,239 289,857 266,893 (Loss)/income from continuing operations before income taxes (533,028) 123,984 138,180 Income tax (benefit)/expense (19,853) 22,463 28,961 Net (loss)/income from continuing operations (513,175) 101,521 109,219 (Loss) from discontinued operations before income taxes (26,855) (5,539) (4,767) Income tax (benefit) (7,013) (1,468) (1,313) Net (loss) from discontinued operations (19,842) (4,071) (3,454) Net (loss)/income $ (533,017) $ 97,450 $ 105,765

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the years ended 2020, 2019, and 2018, respectively. Years Ended December 31, (In thousands) 2020 2019 2018 Non-interest income In-scope of Topic 606: Service charges on deposit accounts $ 19,239 $ 23,122 $ 21,046 Insurance commissions and fees 10,770 10,957 10,983 Wealth management fees 9,285 9,353 9,447 Interchange income 7,559 6,266 7,177 Non-interest income (in-scope of Topic 606) $ 46,853 $ 49,698 $ 48,653 Non-interest income (out-of-scope of Topic 606) 19,454 34,304 25,671 Total non-interest income from continuing operations $ 66,307 $ 84,002 $ 74,324

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2020segment
Accounting Policies [Abstract]
Minimum number of days past due for loans excluding automobile loans on which interest is generally not accrued	90 days
Number of days until which automobile loans accrue, after which they are charged off	120 days
Threshold percentage of amortization of net actuarial gain or loss in net periodic benefit cost over the average remaining service period of active participants in the Plans	10.00%
Number of reportable segments (segment)	1
Number of operating segments (segment)	1

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Credit Loss Update (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance	$ 127,302	$ 63,575	$ 63,575
Unfunded loan commitments	7,629		100
Retained earnings (accumulated deficit)	233,344		(361,082)
Deferred tax assets, net	80,942		98,840
Allowance for credit losses on securities	$ 104		0
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance			25,434
Unfunded loan commitments			7,993
Fair value option reduction			15,291
Retained earnings (accumulated deficit)			24,380
Deferred tax assets, net			9,000
Allowance for credit losses on securities			309
Noncredit discount, amount			3,200
Cumulative Effect, Period of Adoption, Adjustment | Acquired Credit Impaired
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance			15,300
Allowance for credit loss, confirmed losses			11,900
Taxi Medallion Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fair value option reduction			$ 15,300

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	$ 8,081,519	$ 9,502,428	$ 9,502,428
Allowance for credit losses	127,302	63,575	63,575
Allowance for credit losses on securities	104		0
Deferred tax assets, net	46,370		47,747
Other liabilities (ACL unfunded loan commitments)	7,629		100
Retained (deficit) earnings	(233,344)		361,082
Continuing Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, net	$ 46,370		51,165
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans			35
PCD gross up			15,326
Fair value option			(15,291)
Allowance for credit losses			25,434
Allowance for credit losses on securities			309
Other liabilities (ACL unfunded loan commitments)			7,993
Retained (deficit) earnings			(24,380)
Cumulative Effect, Period of Adoption, Adjustment | Continuing Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, net			8,993
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans		9,502,463	9,502,463
PCD gross up			15,326
Fair value option			(15,291)
Allowance for credit losses		$ 89,009	89,009
Allowance for credit losses on securities			309
Other liabilities (ACL unfunded loan commitments)			8,093
Retained (deficit) earnings			336,702
Cumulative Effect, Period of Adoption, Adjusted Balance | Continuing Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, net			$ 60,158

DISCONTINUED OPERATIONS AND H_3

DISCONTINUED OPERATIONS AND HELD FOR SALE - Assets and Liabilities, First Choice Loan Services (Details) - First Choice Loan Services, Inc. - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Loans held for sale, at fair value	$ 0	$ 132,655
Premises and equipment, net	0	1,073
Mortgage servicing rights, at fair value	0	12,299
Mortgage banking derivatives	0	2,329
Right-of-use asset	0	3,462
Deferred tax	0	(3,418)
Other assets	0	5,732
Total assets	0	154,132
Liabilities
Customer payments in process	0	15,372
Lease liability	0	3,494
Other liabilities	0	7,615
Total liabilities	$ 0	$ 26,481

DISCONTINUED OPERATIONS AND H_4

DISCONTINUED OPERATIONS AND HELD FOR SALE - Results of Discontinued Operation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) from discontinued operations before income taxes	$ (26,855)	$ (5,539)	$ (4,767)
Income tax (benefit)	(7,013)	(1,468)	(1,313)
Net (loss) from discontinued operations	(19,842)	(4,071)	(3,454)
First Choice Loan Services, Inc. | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	1,525	6,085	5,267
Interest expense	391	3,372	2,131
Net interest income	1,134	2,713	3,136
Non-interest (loss)/income	(4,740)	38,517	35,574
Total net revenue	(3,606)	41,230	38,710
Non-interest expense	23,249	46,769	43,477
(Loss) from discontinued operations before income taxes	(26,855)	(5,539)	(4,767)
Income tax (benefit)	(7,013)	(1,468)	(1,313)
Net (loss) from discontinued operations	$ (19,842)	$ (4,071)	$ (3,454)

DISCONTINUED OPERATIONS AND H_5

DISCONTINUED OPERATIONS AND HELD FOR SALE - Narrative (Details) - Mid-Atlantic Branch Sale - Discontinued Operations, Held-for-sale $ in Thousands	6 Months Ended
	Jun. 30, 2021branch	Dec. 31, 2020USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans held for sale, at fair value		$ 300,599
Deposits		$ 617,377
Scenario, Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Branches held for sale | branch	8
Final deposit premium, percentage	3.00%

DISCONTINUED OPERATIONS AND H_6

DISCONTINUED OPERATIONS AND HELD FOR SALE - Assets and Liabilities, Mid-Atlantic Branch Sale (Details) - Discontinued Operations, Held-for-sale - Mid-Atlantic Branch Sale $ in Thousands	Dec. 31, 2020USD ($)
Assets
Loans held for sale, at fair value	$ 300,599
Other assets	16,705
Aggregate Unpaid Principal	317,304
Liabilities
Deposits	617,377
Other liabilities	12,688
Total liabilities	$ 630,065

CASH AND CASH EQUIVALENTS (Deta

CASH AND CASH EQUIVALENTS (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
CASH AND CASH EQUIVALENTS
Reserve requirement, included in cash and equivalents	$ 0	$ 18,300,000
Short-term investments pledged as collateral
CASH AND CASH EQUIVALENTS
Short-term investments	$ 75,100,000	$ 96,300,000

TRADING SECURITY (Details)

TRADING SECURITY (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized cost	$ 8.7	$ 9.4
Fair value	9.7	10.8
Unrealized gains (losses)	$ 0.3	$ 0.3	$ 0.4

SECURITIES - Summary of Securit

SECURITIES - Summary of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Securities available for sale
Amortized Cost	$ 1,653,977	$ 1,297,339
Gross Unrealized Gains	41,816	16,503
Gross Unrealized Losses	(561)	(2,287)
Securities available for sale, at fair value	1,695,232	1,311,555
Securities held to maturity
Amortized Cost	465,091	357,979
Gross Unrealized Gains	26,976	16,263
Gross Unrealized Losses	(212)	(965)
Fair Value	491,855	373,277
Marketable equity securities, amortized cost	18,061	37,138
Marketable equity securities, gross unrealized gains	767	5,147
Marketable equity securities, gross unrealized losses	(315)	(729)
Marketable equity securities, fair value	18,513	41,556
Amortized Cost	2,137,129	1,692,456
Gross Unrealized Gains	69,559	37,913
Gross Unrealized Losses	(1,088)	(3,981)
Fair Value	2,205,600	1,726,388
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	104	0
Allowance for credit losses on securities	104	0
Municipal bonds and obligations
Securities available for sale
Amortized Cost	90,273	104,325
Gross Unrealized Gains	7,530	5,813
Gross Unrealized Losses	0	0
Securities available for sale, at fair value	97,803	110,138
Securities held to maturity
Amortized Cost	246,520	252,936
Gross Unrealized Gains	20,106	13,095
Gross Unrealized Losses	0	(5)
Fair Value	266,626	266,026
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	64	0
Agency collateralized mortgage obligations
Securities available for sale
Amortized Cost	740,225	742,550
Gross Unrealized Gains	16,836	6,431
Gross Unrealized Losses	(235)	(169)
Securities available for sale, at fair value	756,826	748,812
Securities held to maturity
Amortized Cost	153,561	69,667
Gross Unrealized Gains	5,989	2,870
Gross Unrealized Losses	(171)	(50)
Fair Value	159,379	72,487
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	0	0
Agency mortgage-backed securities
Securities available for sale
Amortized Cost	433,311	146,589
Gross Unrealized Gains	4,954	1,515
Gross Unrealized Losses	(133)	(360)
Securities available for sale, at fair value	438,132	147,744
Securities held to maturity
Amortized Cost	35,865	6,271
Gross Unrealized Gains	198	29
Gross Unrealized Losses	(29)	0
Fair Value	36,034	6,300
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	0	0
Agency commercial mortgage-backed securities
Securities available for sale
Amortized Cost	278,990	148,066
Gross Unrealized Gains	9,835	176
Gross Unrealized Losses	(175)	(1,146)
Securities available for sale, at fair value	288,650	147,096
Securities held to maturity
Amortized Cost	25,481	10,353
Gross Unrealized Gains	590	51
Gross Unrealized Losses	(12)	0
Fair Value	26,059	10,404
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	0	0
Corporate bonds
Securities available for sale
Amortized Cost	59,098	115,395
Gross Unrealized Gains	942	1,788
Gross Unrealized Losses	(10)	(607)
Securities available for sale, at fair value	60,030	116,576
Securities held to maturity
Debt securities, available for sale, allowance	0	0
Tax advantaged economic development bonds
Securities held to maturity
Amortized Cost	3,369	18,456
Gross Unrealized Gains	93	218
Gross Unrealized Losses	0	(910)
Fair Value	3,462	17,764
Debt securities, held to maturity, allowance	40	0
Other bonds and obligations
Securities available for sale
Amortized Cost	52,080	40,414
Gross Unrealized Gains	1,719	780
Gross Unrealized Losses	(8)	(5)
Securities available for sale, at fair value	53,791	41,189
Securities held to maturity
Amortized Cost	295	296
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	295	296
Debt securities, available for sale, allowance	0	0
Debt securities, held to maturity, allowance	$ 0	$ 0

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)branch	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Investment Holdings [Line Items]
Purchases of securities available for sale | $	$ 885,182	$ 119,671	$ 257,547
Proceeds from sales of securities available for sale | $	$ 69,337	136,229	$ 499
Securities Available for Sale | Collateralized mortgage obligations
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	12
Number of securities in the portfolio of HTM (security)	225
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.30%
Securities Available for Sale | Mortgage-backed Securities
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	17
Number of securities in the portfolio of HTM (security)	125
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.30%
Securities Available for Sale | Corporate bonds
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	1
Number of securities in the portfolio of HTM (security)	15
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.20%
Securities Available for Sale | Other bonds and obligations
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	3
Number of securities in the portfolio of HTM (security)	7
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.80%
Held-to-maturity Securities | Collateralized mortgage obligations
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	2
Number of securities in the portfolio of HTM (security)	13
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.70%
Held-to-maturity Securities | Mortgage-backed Securities
Investment Holdings [Line Items]
Number of HTM investment securities in unrealized loss positions (security)	2
Number of securities in the portfolio of HTM (security)	6
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions	0.10%
Net unrealized holding gain/(loss) on AFS securities
Investment Holdings [Line Items]
Income tax benefit/(liability) related to items of accumulated other comprehensive income/(loss) | $	$ (11,500)	(5,100)
Net unrealized holding gain/(loss) on AFS securities | Securities Available for Sale
Investment Holdings [Line Items]
Other accumulated comprehensive income/(loss), before tax | $	41,300	14,200
Net unrealized holding gain/(loss) on AFS securities | Held-to-maturity Securities
Investment Holdings [Line Items]
Other accumulated comprehensive income/(loss), before tax | $	$ 3,700	$ 5,000

SECURITIES - Held to Maturity (

SECURITIES - Held to Maturity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	$ 0
Impact of ASC 326 adoption	(104)
Provision for credit losses- reversal	(205)
Balance at December 31, 2020	(104)
Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	309
Impact of ASC 326 adoption	309
Municipal bonds and obligations
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	0
Impact of ASC 326 adoption	(64)
Provision for credit losses- reversal	(19)
Balance at December 31, 2020	(64)
Municipal bonds and obligations | Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	83
Impact of ASC 326 adoption	83
Tax advantaged economic development bonds
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	0
Impact of ASC 326 adoption	(40)
Provision for credit losses- reversal	(186)
Balance at December 31, 2020	(40)
Tax advantaged economic development bonds | Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	226
Impact of ASC 326 adoption	$ 226

SECURITIES - Amortized Cost and

SECURITIES - Amortized Cost and Estimated Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale, Amortized Cost
Within 1 year	$ 33,248
Over 1 year to 5 years	8,148
Over 5 years to 10 years	67,952
Over 10 years	92,103
Total bonds and obligations	201,451
Mortgage-backed securities	1,452,526
Amortized Cost	1,653,977	$ 1,297,339
Available for sale, Fair Value
Within 1 year	33,265
Over 1 year to 5 years	8,276
Over 5 years to 10 years	69,619
Over 10 years	100,464
Total bonds and obligations	211,624
Mortgage-backed securities	1,483,608
Available-for-securities	1,695,232	1,311,555
Held to maturity, Amortized Cost
Within 1 year	1,950
Over 1 year to 5 years	3,216
Over 5 years to 10 years	23,050
Over 10 years	221,968
Total bonds and obligations	250,184
Mortgage-backed securities	214,907
Amortized Cost	465,091	357,979
Held to maturity, Fair Value
Within 1 year	1,952
Over 1 year to 5 years	3,233
Over 5 years to 10 years	24,026
Over 10 years	241,172
Total bonds and obligations	270,383
Mortgage-backed securities	221,472
Held-to-maturity securities	$ 491,855	$ 373,277

SECURITIES - Pledged Securities

SECURITIES - Pledged Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Securities pledged to swap counterparties	$ 37,532	$ 25,728
Securities pledged for municipal deposits	156,047	168,740
Securities pledged, amortized cost	193,579	194,468
Fair Value
Securities pledged to swap counterparties	37,815	25,828
Securities pledged for municipal deposits	166,570	175,719
Securities pledged, fair value	204,385	201,547
Components of net realized gains and losses on the sale of AFS securities
Gross recognized gains	4,602	7,492	$ 3,256
Gross recognized losses	(11,133)	(3,103)	(6,975)
Net recognized gains/(losses)	$ (6,531)	$ 4,389	$ (3,719)

SECURITIES - Reclassifications

SECURITIES - Reclassifications out of AOCI into Earnings (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities available for sale
Less than twelve months, gross unrealized losses	$ 551	$ 1,287
Less than twelve months, fair value	174,147	180,826
Over twelve months, gross unrealized losses	10	1,000
Over twelve months, fair value	1,286	83,773
Total gross unrealized losses	561	2,287
Total fair value	175,433	264,599
Securities held to maturity
Less than twelve months, gross unrealized losses	212	55
Less than twelve months, fair value	55,974	10,578
Over twelve months, gross unrealized losses	0	910
Over twelve months, fair value	0	6,925
Total gross unrealized losses	212	965
Total fair value	55,974	17,503
Securities available for sale and held to maturity
Less than twelve months, gross unrealized losses	763	1,342
Less than twelve months, fair value	230,121	191,404
Over twelve months, gross unrealized losses	10	1,910
Over twelve months, fair value	1,286	90,698
Total gross unrealized losses	773	3,252
Total fair value	231,407	282,102
Debt securities | Agency collateralized mortgage obligations
Securities available for sale
Less than twelve months, gross unrealized losses	235	127
Less than twelve months, fair value	77,898	52,623
Over twelve months, gross unrealized losses	0	42
Over twelve months, fair value	0	6,267
Total gross unrealized losses	235	169
Total fair value	77,898	58,890
Securities held to maturity
Less than twelve months, gross unrealized losses	171	50
Less than twelve months, fair value	25,048	9,778
Over twelve months, gross unrealized losses	0	0
Over twelve months, fair value	0	0
Total gross unrealized losses	171	50
Total fair value	25,048	9,778
Debt securities | Municipal bonds and obligations
Securities held to maturity
Less than twelve months, gross unrealized losses		5
Less than twelve months, fair value		800
Over twelve months, gross unrealized losses		0
Over twelve months, fair value		0
Total gross unrealized losses		5
Total fair value		800
Debt securities | Agency residential mortgage-backed securities
Securities available for sale
Less than twelve months, gross unrealized losses	131	59
Less than twelve months, fair value	39,939	10,640
Over twelve months, gross unrealized losses	2	301
Over twelve months, fair value	256	23,404
Total gross unrealized losses	133	360
Total fair value	40,195	34,044
Securities held to maturity
Less than twelve months, gross unrealized losses	29
Less than twelve months, fair value	20,710
Over twelve months, gross unrealized losses	0
Over twelve months, fair value	0
Total gross unrealized losses	29
Total fair value	20,710
Debt securities | Agency commercial mortgage-backed securities
Securities available for sale
Less than twelve months, gross unrealized losses	175	1,097
Less than twelve months, fair value	51,435	116,324
Over twelve months, gross unrealized losses	0	49
Over twelve months, fair value	0	11,250
Total gross unrealized losses	175	1,146
Total fair value	51,435	127,574
Securities held to maturity
Less than twelve months, gross unrealized losses	12
Less than twelve months, fair value	10,216
Over twelve months, gross unrealized losses	0
Over twelve months, fair value	0
Total gross unrealized losses	12
Total fair value	10,216
Debt securities | Corporate bonds
Securities available for sale
Less than twelve months, gross unrealized losses	10	0
Less than twelve months, fair value	4,875	0
Over twelve months, gross unrealized losses	0	607
Over twelve months, fair value	0	42,823
Total gross unrealized losses	10	607
Total fair value	4,875	42,823
Debt securities | Other bonds and obligations
Securities available for sale
Less than twelve months, gross unrealized losses	0	4
Less than twelve months, fair value	0	1,239
Over twelve months, gross unrealized losses	8	1
Over twelve months, fair value	1,030	29
Total gross unrealized losses	8	5
Total fair value	$ 1,030	1,268
Debt securities | Tax advantaged economic development bonds
Securities held to maturity
Less than twelve months, gross unrealized losses		0
Less than twelve months, fair value		0
Over twelve months, gross unrealized losses		910
Over twelve months, fair value		6,925
Total gross unrealized losses		910
Total fair value		$ 6,925

LOANS AND RELATED ALLOWANCE F_3

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Impact of Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total loans	$ 8,081,519	$ 9,502,428	$ 9,502,428
Total allowance	127,302	63,575	63,575
Commercial loans
Allowance for loan losses
Total loans			5,874,777
Commercial loans | Construction
Allowance for loan losses
Total loans	454,513	448,452	448,452
Total allowance	5,111		2,713
Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	483,350	631,740	631,740
Total allowance	5,916		4,413
Commercial real estate loans
Allowance for loan losses
Total loans			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Total loans			429,806
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	552,413	673,308	673,308
Total allowance	12,380		4,880
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	2,119,263	2,189,780	2,189,780
Total allowance	35,850		16,344
Commercial And Industrial
Allowance for loan losses
Total loans			1,843,683
Total allowance			20,099
Residential real estate
Allowance for loan losses
Total loans			2,685,472
Residential real estate | Construction
Allowance for loan losses
Total loans			8,119
Residential real estate | Residential real estate
Allowance for loan losses
Total loans	1,931,681	2,853,385	2,853,385
Total allowance	28,491		9,970
Consumer loans
Allowance for loan losses
Total loans			942,179
Consumer loans | Home equity
Allowance for loan losses
Total loans			378,793
Total allowance			1,470
Consumer loans | Consumer other
Allowance for loan losses
Total loans	303,154	483,287	483,287
Total allowance	$ 8,059		3,686
Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Total loans			35
Total allowance			25,434
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans | Construction
Allowance for loan losses
Total loans			187
Total allowance			(342)
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans			252
Total allowance			(1,842)
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans			3,185
Total allowance			6,062
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans			6,540
Total allowance			11,201
Cumulative Effect, Period of Adoption, Adjustment | Commercial And Industrial
Allowance for loan losses
Total loans			(12,212)
Total allowance			(2,189)
Cumulative Effect, Period of Adoption, Adjustment | Residential real estate | Residential real estate
Allowance for loan losses
Total loans			1,868
Total allowance			6,799
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans | Home equity
Allowance for loan losses
Total loans			10
Total allowance			4,884
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans | Consumer other
Allowance for loan losses
Total loans			205
Total allowance			861
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Total loans		9,502,463	9,502,463
Total allowance		89,009	89,009
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans | Construction
Allowance for loan losses
Total loans		448,639
Total allowance		2,371	2,371
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans		631,992
Total allowance		2,571	2,571
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans		676,493
Total allowance		10,942	10,942
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans		2,196,320
Total allowance		27,545	27,545
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial And Industrial
Allowance for loan losses
Total loans		1,831,471
Total allowance		17,910
Cumulative Effect, Period of Adoption, Adjusted Balance | Residential real estate | Residential real estate
Allowance for loan losses
Total loans		2,855,253
Total allowance		16,769	16,769
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans | Home equity
Allowance for loan losses
Total loans		378,803
Total allowance		6,354
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans | Consumer other
Allowance for loan losses
Total loans		483,492
Total allowance		$ 4,547	$ 4,547

LOANS AND RELATED ALLOWANCE F_4

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Total Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total loans	$ 8,081,519	$ 9,502,428	$ 9,502,428
Allowance for credit losses	127,302	63,575	63,575
Net loans	7,954,217	9,438,853	9,438,853
Commercial loans
Allowance for loan losses
Total loans			5,874,777
Commercial loans | Construction
Allowance for loan losses
Total loans	454,513	448,452	448,452
Allowance for credit losses	5,111		2,713
Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	483,350	631,740	631,740
Allowance for credit losses	5,916		4,413
Commercial real estate loans
Allowance for loan losses
Total loans			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Total loans			429,806
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	552,413	673,308	673,308
Allowance for credit losses	12,380		4,880
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	2,119,263	2,189,780	2,189,780
Allowance for credit losses	35,850		16,344
Commercial and industrial loans
Allowance for loan losses
Total loans	1,943,164	1,843,683	1,840,508
Allowance for credit losses	25,013		20,099
Residential real estate
Allowance for loan losses
Total loans			2,685,472
Residential real estate | Construction
Allowance for loan losses
Total loans			8,119
Residential real estate | Residential real estate
Allowance for loan losses
Total loans	1,931,681	2,853,385	2,853,385
Allowance for credit losses	28,491		9,970
Consumer loans
Allowance for loan losses
Total loans			942,179
Consumer loans | Home equity
Allowance for loan losses
Total loans	293,981	378,793	380,591
Allowance for credit losses	6,482		1,470
Consumer loans | Consumer other
Allowance for loan losses
Total loans	303,154	$ 483,287	483,287
Allowance for credit losses	$ 8,059		$ 3,686

LOANS AND RELATED ALLOWANCE F_5

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)Loan	Dec. 31, 2019USD ($)Loan	Dec. 31, 2018USD ($)	Jan. 01, 2020USD ($)
Allowance for loan losses
Net loans	$ 7,954,217,000	$ 9,438,853,000		$ 9,438,853,000
Payments to acquire loans and leases held-for-investment	98,000,000	432,000,000
Proceeds from sale of loans and leases held-for-investment	415,000,000	310,000,000
Gain (loss) on sales of loans, net	10,600,000	12,000,000	$ 9,300,000
Total loans	8,081,519,000	9,502,428,000		9,502,428,000
Other real estate owned	149,000	0
Loans pledged as collateral	925,000,000
Due to related parties	2,000,000	1,800,000
Loans receivable, related parties	$ 1,100,000	$ 1,000,000
Number of Loans | Loan	0	1
Additional funds committed amount		$ 0
Commercial and industrial loans
Allowance for loan losses
Total loans	$ 1,943,164,000	1,840,508,000		$ 1,843,683,000
Financing receivable, nonaccrual, medallion loans, fair value	2,300,000
Financing receivable, nonaccrual, medallion loans, contractual balance	53,900,000
Residential real estate
Allowance for loan losses
Total loans		2,685,472,000
Other real estate owned	149,000
Residential real estate | Collateralized Residential Mortgage Loans, In Process of Foreclosure
Allowance for loan losses
Total loans	3,300,000	6,500,000
Total Loans | Credit Concentration Risk | Non-Residential
Allowance for loan losses
Total loans	$ 1,500,000,000	$ 1,700,000,000
Concentration risk, percentage	19.00%	18.10%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Allowance for loan losses
Net loans	$ 633,300,000

LOANS AND RELATED ALLOWANCE F_6

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Loss Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 63,575
Charge-offs	(45,795)
Recoveries	8,005
Provision for Credit Losses	76,083
Balance at End of Period	127,302
Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,713
Charge-offs	(834)
Recoveries	0
Provision for Credit Losses	3,574
Balance at End of Period	5,111
Commercial loans | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	4,413
Charge-offs	(100)
Recoveries	100
Provision for Credit Losses	3,345
Balance at End of Period	5,916
Commercial real estate loans | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	4,880
Charge-offs	(8,686)
Recoveries	1,053
Provision for Credit Losses	9,071
Balance at End of Period	12,380
Commercial real estate loans | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	16,344
Charge-offs	(11,653)
Recoveries	307
Provision for Credit Losses	19,651
Balance at End of Period	35,850
Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	20,099
Charge-offs	(19,328)
Recoveries	4,285
Provision for Credit Losses	22,146
Balance at End of Period	25,013
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	9,970
Charge-offs	(2,285)
Recoveries	1,359
Provision for Credit Losses	12,648
Balance at End of Period	28,491
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	1,470
Charge-offs	(347)
Recoveries	292
Provision for Credit Losses	183
Balance at End of Period	6,482
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	3,686
Charge-offs	(2,562)
Recoveries	609
Provision for Credit Losses	5,465
Balance at End of Period	8,059
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	25,434
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	(342)
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	(1,842)
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate loans | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	6,062
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate loans | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	11,201
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	(2,189)
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	6,799
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	4,884
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	861
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	89,009
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,371
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,571
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate loans | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	10,942
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate loans | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	27,545
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	17,910
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	16,769
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	6,354
Balance at End of Period
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 4,547
Balance at End of Period

LOANS AND RELATED ALLOWANCE F_7

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Losses Activity, Unfunded Loan Commitments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at December 31, 2019	$ 100
Release of expense for credit losses	(464)
Balance at December 31, 2020	7,629
Cumulative Effect, Period of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at December 31, 2019	7,993
Cumulative Effect, Period of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at December 31, 2019	$ 8,093

LOANS AND RELATED ALLOWANCE F_8

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loan Risk by Category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total	$ 8,081,519	$ 9,502,428	$ 9,502,428
Commercial loans
Allowance for loan losses
Total			5,874,777
Commercial loans | Construction
Allowance for loan losses
2020	38,374
2019	255,377
2018	115,003
2017	32,474
2016	9,519
Prior	2,766
Revolving Loans Amortized Cost Basis	1,000
Revolving Loans Converted to Term	0
Total	454,513	448,452	448,452
Commercial loans | Commercial multifamily
Allowance for loan losses
2020	31,438
2019	57,659
2018	74,932
2017	77,746
2016	81,113
Prior	160,297
Revolving Loans Amortized Cost Basis	165
Revolving Loans Converted to Term	0
Total	483,350	631,740	631,740
Commercial real estate loans
Allowance for loan losses
Total			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Total			429,806
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
2020	58,862
2019	88,674
2018	109,530
2017	67,387
2016	46,539
Prior	180,227
Revolving Loans Amortized Cost Basis	1,194
Revolving Loans Converted to Term	0
Total	552,413	673,308	673,308
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
2020	188,324
2019	296,194
2018	441,743
2017	250,525
2016	317,143
Prior	608,678
Revolving Loans Amortized Cost Basis	16,656
Revolving Loans Converted to Term	0
Total	2,119,263	2,189,780	2,189,780
Commercial and industrial loans
Allowance for loan losses
2020	763,119
2019	204,621
2018	235,869
2017	141,601
2016	53,431
Prior	153,917
Revolving Loans Amortized Cost Basis	390,606
Revolving Loans Converted to Term	0
Total	1,943,164	1,843,683	1,840,508
Residential real estate
Allowance for loan losses
Total			2,685,472
Residential real estate | Construction
Allowance for loan losses
Total			8,119
Residential real estate | Residential real estate
Allowance for loan losses
2020	151,958
2019	146,181
2018	273,556
2017	322,716
2016	333,576
Prior	700,404
Revolving Loans Amortized Cost Basis	3,290
Revolving Loans Converted to Term	0
Total	1,931,681	2,853,385	2,853,385
Consumer loans
Allowance for loan losses
Total			942,179
Consumer loans | Home equity
Allowance for loan losses
2020	2,445
2019	1,960
2018	317
2017	1,859
2016	499
Prior	1,882
Revolving Loans Amortized Cost Basis	285,019
Revolving Loans Converted to Term	0
Total	293,981	378,793	380,591
Consumer loans | Consumer other
Allowance for loan losses
2020	15,232
2019	35,633
2018	103,241
2017	70,965
2016	37,006
Prior	31,734
Revolving Loans Amortized Cost Basis	9,343
Revolving Loans Converted to Term	0
Total	303,154	$ 483,287	483,287
Pass | Commercial loans | Construction
Allowance for loan losses
2020	38,374
2019	255,377
2018	114,690
2017	28,474
2016	9,519
Prior	2,766
Revolving Loans Amortized Cost Basis	1,000
Revolving Loans Converted to Term	0
Total	450,200
Pass | Commercial loans | Commercial multifamily
Allowance for loan losses
2020	31,438
2019	57,659
2018	74,932
2017	77,746
2016	81,066
Prior	153,818
Revolving Loans Amortized Cost Basis	20
Revolving Loans Converted to Term	0
Total	476,679
Pass | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
2020	58,327
2019	84,839
2018	104,797
2017	64,693
2016	44,300
Prior	169,197
Revolving Loans Amortized Cost Basis	1,194
Revolving Loans Converted to Term	0
Total	527,347
Pass | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
2020	180,520
2019	292,386
2018	435,440
2017	223,935
2016	303,221
Prior	497,066
Revolving Loans Amortized Cost Basis	15,393
Revolving Loans Converted to Term	0
Total	1,947,961
Pass | Commercial and industrial loans
Allowance for loan losses
2020	754,260
2019	159,046
2018	205,651
2017	130,985
2016	48,326
Prior	148,222
Revolving Loans Amortized Cost Basis	368,769
Revolving Loans Converted to Term	0
Total	1,815,259
Pass | Residential real estate | Residential real estate
Allowance for loan losses
2020	150,583
2019	146,142
2018	272,399
2017	320,384
2016	333,159
Prior	691,078
Revolving Loans Amortized Cost Basis	3,281
Revolving Loans Converted to Term	0
Total	1,917,026
Special Mention
Allowance for loan losses
Total			75,284
Special Mention | Commercial loans | Construction
Allowance for loan losses
2020	0
2019	0
2018	313
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	313
Special Mention | Commercial loans | Commercial multifamily
Allowance for loan losses
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Special Mention | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
2020	535
2019	2,569
2018	1,136
2017	1,009
2016	800
Prior	2,579
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	8,628
Special Mention | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
2020	0
2019	279
2018	2,068
2017	6,958
2016	11,798
Prior	44,961
Revolving Loans Amortized Cost Basis	1,068
Revolving Loans Converted to Term	0
Total	67,132
Special Mention | Commercial and industrial loans
Allowance for loan losses
2020	1,467
2019	5,753
2018	5,267
2017	2,851
2016	1,601
Prior	65
Revolving Loans Amortized Cost Basis	12,408
Revolving Loans Converted to Term	0
Total	29,412
Special Mention | Residential real estate | Residential real estate
Allowance for loan losses
2020	384
2019	0
2018	454
2017	1,430
2016	0
Prior	362
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	2,630
Substandard
Allowance for loan losses
Total			$ 122,424
Substandard | Commercial loans | Construction
Allowance for loan losses
2020	0
2019	0
2018	0
2017	4,000
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	4,000
Substandard | Commercial loans | Commercial multifamily
Allowance for loan losses
2020	0
2019	0
2018	0
2017	0
2016	47
Prior	6,479
Revolving Loans Amortized Cost Basis	145
Revolving Loans Converted to Term	0
Total	6,671
Substandard | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
2020	0
2019	1,266
2018	3,597
2017	1,685
2016	1,439
Prior	8,451
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	16,438
Substandard | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
2020	7,804
2019	3,529
2018	4,235
2017	19,632
2016	2,124
Prior	66,651
Revolving Loans Amortized Cost Basis	195
Revolving Loans Converted to Term	0
Total	104,170
Substandard | Commercial and industrial loans
Allowance for loan losses
2020	7,392
2019	39,822
2018	24,951
2017	7,765
2016	3,504
Prior	5,630
Revolving Loans Amortized Cost Basis	9,099
Revolving Loans Converted to Term	0
Total	98,163
Substandard | Residential real estate | Residential real estate
Allowance for loan losses
2020	991
2019	39
2018	703
2017	902
2016	417
Prior	8,964
Revolving Loans Amortized Cost Basis	9
Revolving Loans Converted to Term	0
Total	12,025
Doubtful | Commercial and industrial loans
Allowance for loan losses
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	330
Revolving Loans Converted to Term	0
Total	330
Performing | Consumer loans | Home equity
Allowance for loan losses
2020	2,445
2019	1,960
2018	316
2017	1,859
2016	499
Prior	1,882
Revolving Loans Amortized Cost Basis	282,123
Revolving Loans Converted to Term	0
Total	291,084
Performing | Consumer loans | Consumer other
Allowance for loan losses
2020	15,193
2019	35,317
2018	101,730
2017	69,366
2016	35,421
Prior	31,327
Revolving Loans Amortized Cost Basis	9,339
Revolving Loans Converted to Term	0
Total	297,693
Performing | Special Mention
Allowance for loan losses
Total	109,299
Performing | Substandard
Allowance for loan losses
Total	185,207
Nonperforming | Consumer loans | Home equity
Allowance for loan losses
2020	0
2019	0
2018	1
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	2,896
Revolving Loans Converted to Term	0
Total	2,897
Nonperforming | Consumer loans | Consumer other
Allowance for loan losses
2020	39
2019	316
2018	1,511
2017	1,599
2016	1,585
Prior	407
Revolving Loans Amortized Cost Basis	4
Revolving Loans Converted to Term	0
Total	$ 5,461

LOANS AND RELATED ALLOWANCE F_9

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loans Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total Past Due	$ 92,708
Current	7,988,811
Total	8,081,519	$ 9,502,428	$ 9,502,428
Past Due 90 Days or Greater and Accruing	11,450
Acquired Loans
Allowance for loan losses
Total Past Due			20,793
Total			2,335,931
Past Due 90 Days or Greater and Accruing			6,404
Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			61,419
Commercial loans
Allowance for loan losses
Total			5,874,777
Commercial loans | Acquired Loans
Allowance for loan losses
Total			1,635,204
Commercial loans | Construction
Allowance for loan losses
Total Past Due	0
Current	454,513
Total	454,513	448,452	448,452
Past Due 90 Days or Greater and Accruing	0
Commercial loans | Commercial multifamily
Allowance for loan losses
Total Past Due	757
Current	482,593
Total	483,350	631,740	631,740
Past Due 90 Days or Greater and Accruing	0
Commercial real estate loans
Allowance for loan losses
Total			4,034,269
Commercial real estate loans | Acquired Loans
Allowance for loan losses
Total Past Due			14,399
Total			1,237,313
Past Due 90 Days or Greater and Accruing			5,751
Commercial real estate loans | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			23,035
Commercial real estate loans | Construction
Allowance for loan losses
Total			429,806
Commercial real estate loans | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
Total			47,792
Past Due 90 Days or Greater and Accruing			0
Commercial real estate loans | Construction | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			1,396
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total Past Due	6,334
Current	546,079
Total	552,413	673,308	673,308
Past Due 90 Days or Greater and Accruing	385
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total Past Due	38,872
Current	2,080,391
Total	2,119,263	2,189,780	2,189,780
Past Due 90 Days or Greater and Accruing	8,817
Commercial real estate loans | Residential real estate | Acquired Loans
Allowance for loan losses
Total			1,189,521
Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total			3,604,463
Commercial real estate loans | Commercial and industrial - other | Acquired Loans
Allowance for loan losses
Total Past Due			14,399
Total			1,189,521
Past Due 90 Days or Greater and Accruing			5,751
Commercial real estate loans | Commercial and industrial - other | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			21,639
Commercial and industrial loans
Allowance for loan losses
Total Past Due	19,257
Current	1,923,907
Total	1,943,164	1,843,683	1,840,508
Past Due 90 Days or Greater and Accruing	541
Commercial and industrial loans | Acquired Loans
Allowance for loan losses
Total Past Due			2,462
Total			397,891
Past Due 90 Days or Greater and Accruing			442
Commercial and industrial loans | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			26,718
Residential real estate
Allowance for loan losses
Total			2,685,472
Residential real estate | Acquired Loans
Allowance for loan losses
Total Past Due			2,168
Total			537,014
Past Due 90 Days or Greater and Accruing			139
Residential real estate | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			10,840
Residential real estate | Construction
Allowance for loan losses
Total			8,119
Residential real estate | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
Total			3,478
Past Due 90 Days or Greater and Accruing			0
Residential real estate | Construction | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			0
Residential real estate | Residential real estate
Allowance for loan losses
Total Past Due	15,813
Current	1,915,868
Total	1,931,681	2,853,385	2,853,385
Past Due 90 Days or Greater and Accruing	1,404
Residential real estate | 1-4 family
Allowance for loan losses
Total			2,677,353
Residential real estate | 1-4 family | Acquired Loans
Allowance for loan losses
Total Past Due			2,168
Total			533,536
Past Due 90 Days or Greater and Accruing			139
Residential real estate | 1-4 family | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			10,840
Consumer loans
Allowance for loan losses
Total			942,179
Consumer loans | Acquired Loans
Allowance for loan losses
Total Past Due			1,764
Total			163,713
Past Due 90 Days or Greater and Accruing			72
Consumer loans | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			826
Consumer loans | Home equity
Allowance for loan losses
Total Past Due	3,425
Current	290,556
Total	293,981	378,793	380,591
Past Due 90 Days or Greater and Accruing	243
Consumer loans | Home equity | Acquired Loans
Allowance for loan losses
Total Past Due			1,357
Total			106,724
Past Due 90 Days or Greater and Accruing			72
Consumer loans | Home equity | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			540
Consumer loans | Consumer other
Allowance for loan losses
Total Past Due	8,250
Current	294,904
Total	303,154	$ 483,287	483,287
Past Due 90 Days or Greater and Accruing	60
Consumer loans | Auto and other
Allowance for loan losses
Total			561,588
Consumer loans | Auto and other | Acquired Loans
Allowance for loan losses
Total Past Due			407
Total			56,989
Past Due 90 Days or Greater and Accruing			0
Consumer loans | Auto and other | Acquired Loans | Acquired Credit Impaired
Allowance for loan losses
Current			286
30-59 Days Past Due
Allowance for loan losses
Total Past Due	8,561
30-59 Days Past Due | Acquired Loans
Allowance for loan losses
Total Past Due			6,006
30-59 Days Past Due | Commercial loans | Construction
Allowance for loan losses
Total Past Due	0
30-59 Days Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total Past Due	0
30-59 Days Past Due | Commercial real estate loans | Acquired Loans
Allowance for loan losses
Total Past Due			3,907
30-59 Days Past Due | Commercial real estate loans | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
30-59 Days Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total Past Due	809
30-59 Days Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total Past Due	315
30-59 Days Past Due | Commercial real estate loans | Commercial and industrial - other | Acquired Loans
Allowance for loan losses
Total Past Due			3,907
30-59 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	3,016
30-59 Days Past Due | Commercial and industrial loans | Acquired Loans
Allowance for loan losses
Total Past Due			888
30-59 Days Past Due | Residential real estate | Acquired Loans
Allowance for loan losses
Total Past Due			745
30-59 Days Past Due | Residential real estate | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
30-59 Days Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total Past Due	2,068
30-59 Days Past Due | Residential real estate | 1-4 family | Acquired Loans
Allowance for loan losses
Total Past Due			745
30-59 Days Past Due | Consumer loans | Acquired Loans
Allowance for loan losses
Total Past Due			466
30-59 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	244
30-59 Days Past Due | Consumer loans | Home equity | Acquired Loans
Allowance for loan losses
Total Past Due			346
30-59 Days Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total Past Due	2,109
30-59 Days Past Due | Consumer loans | Auto and other | Acquired Loans
Allowance for loan losses
Total Past Due			120
60-89 Days Past Due
Allowance for loan losses
Total Past Due	7,749
60-89 Days Past Due | Acquired Loans
Allowance for loan losses
Total Past Due			1,279
60-89 Days Past Due | Commercial loans | Construction
Allowance for loan losses
Total Past Due	0
60-89 Days Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total Past Due	0
60-89 Days Past Due | Commercial real estate loans | Acquired Loans
Allowance for loan losses
Total Past Due			245
60-89 Days Past Due | Commercial real estate loans | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
60-89 Days Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total Past Due	631
60-89 Days Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total Past Due	168
60-89 Days Past Due | Commercial real estate loans | Commercial and industrial - other | Acquired Loans
Allowance for loan losses
Total Past Due			245
60-89 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	3,259
60-89 Days Past Due | Commercial and industrial loans | Acquired Loans
Allowance for loan losses
Total Past Due			299
60-89 Days Past Due | Residential real estate | Acquired Loans
Allowance for loan losses
Total Past Due			491
60-89 Days Past Due | Residential real estate | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
60-89 Days Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total Past Due	2,630
60-89 Days Past Due | Residential real estate | 1-4 family | Acquired Loans
Allowance for loan losses
Total Past Due			491
60-89 Days Past Due | Consumer loans | Acquired Loans
Allowance for loan losses
Total Past Due			244
60-89 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	284
60-89 Days Past Due | Consumer loans | Home equity | Acquired Loans
Allowance for loan losses
Total Past Due			222
60-89 Days Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total Past Due	777
60-89 Days Past Due | Consumer loans | Auto and other | Acquired Loans
Allowance for loan losses
Total Past Due			22
90 Days or Greater Past Due
Allowance for loan losses
Total Past Due	76,398
90 Days or Greater Past Due | Acquired Loans
Allowance for loan losses
Total Past Due			13,508
90 Days or Greater Past Due | Commercial loans | Construction
Allowance for loan losses
Total Past Due	0
90 Days or Greater Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total Past Due	757
90 Days or Greater Past Due | Commercial real estate loans | Acquired Loans
Allowance for loan losses
Total Past Due			10,247
90 Days or Greater Past Due | Commercial real estate loans | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
90 Days or Greater Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total Past Due	4,894
90 Days or Greater Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total Past Due	38,389
90 Days or Greater Past Due | Commercial real estate loans | Commercial and industrial - other | Acquired Loans
Allowance for loan losses
Total Past Due			10,247
90 Days or Greater Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	12,982
90 Days or Greater Past Due | Commercial and industrial loans | Acquired Loans
Allowance for loan losses
Total Past Due			1,275
90 Days or Greater Past Due | Residential real estate | Acquired Loans
Allowance for loan losses
Total Past Due			932
90 Days or Greater Past Due | Residential real estate | Construction | Acquired Loans
Allowance for loan losses
Total Past Due			0
90 Days or Greater Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total Past Due	11,115
90 Days or Greater Past Due | Residential real estate | 1-4 family | Acquired Loans
Allowance for loan losses
Total Past Due			932
90 Days or Greater Past Due | Consumer loans | Acquired Loans
Allowance for loan losses
Total Past Due			1,054
90 Days or Greater Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	2,897
90 Days or Greater Past Due | Consumer loans | Home equity | Acquired Loans
Allowance for loan losses
Total Past Due			789
90 Days or Greater Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total Past Due	$ 5,364
90 Days or Greater Past Due | Consumer loans | Auto and other | Acquired Loans
Allowance for loan losses
Total Past Due			$ 265

LOANS AND RELATED ALLOWANCE _10

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Nonaccrual Loans and Loans Past Due (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Non-accrual loans	$ 64,948	$ 39,640	$ 39,640
Nonaccrual With No Related Allowance	27,418
Past Due 90 Days or Greater and Accruing	11,450
Interest Income Recognized on Nonaccrual	0
Commercial loans | Construction
Allowance for loan losses
Non-accrual loans	0	0
Nonaccrual With No Related Allowance	0
Past Due 90 Days or Greater and Accruing	0
Interest Income Recognized on Nonaccrual	0
Commercial loans | Commercial multifamily
Allowance for loan losses
Non-accrual loans	757	811
Nonaccrual With No Related Allowance	591
Past Due 90 Days or Greater and Accruing	0
Interest Income Recognized on Nonaccrual	0
Commercial real estate loans
Allowance for loan losses
Non-accrual loans			20,119
Commercial real estate loans | Construction
Allowance for loan losses
Non-accrual loans			0
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Non-accrual loans	4,509	15,389
Nonaccrual With No Related Allowance	2,290
Past Due 90 Days or Greater and Accruing	385
Interest Income Recognized on Nonaccrual	0
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Non-accrual loans	29,572	1,031
Nonaccrual With No Related Allowance	13,912
Past Due 90 Days or Greater and Accruing	8,817
Interest Income Recognized on Nonaccrual	0
Commercial and industrial loans
Allowance for loan losses
Non-accrual loans	12,441	11,218	11,373
Nonaccrual With No Related Allowance	4,725
Past Due 90 Days or Greater and Accruing	541
Interest Income Recognized on Nonaccrual	0
Residential real estate
Allowance for loan losses
Non-accrual loans			3,343
Residential real estate | Construction
Allowance for loan losses
Non-accrual loans			0
Residential real estate | Residential real estate
Allowance for loan losses
Non-accrual loans	9,711	6,411
Nonaccrual With No Related Allowance	5,739
Past Due 90 Days or Greater and Accruing	1,404
Interest Income Recognized on Nonaccrual	0
Consumer loans
Allowance for loan losses
Non-accrual loans			4,805
Consumer loans | Home equity
Allowance for loan losses
Non-accrual loans	2,654	1,798	$ 1,812
Nonaccrual With No Related Allowance	159
Past Due 90 Days or Greater and Accruing	243
Interest Income Recognized on Nonaccrual	0
Consumer loans | Consumer other
Allowance for loan losses
Non-accrual loans	5,304	$ 2,982
Nonaccrual With No Related Allowance	2
Past Due 90 Days or Greater and Accruing	60
Interest Income Recognized on Nonaccrual	$ 0

LOANS AND RELATED ALLOWANCE _11

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Total Loans Rated Special Mention or Lower (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 8,081,519	$ 9,502,428	$ 9,502,428
Non-Accrual
Allowance for loan losses
Financing receivable, before allowance for credit loss			39,640
Non-Accrual | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	64,948
Substandard
Allowance for loan losses
Financing receivable, before allowance for credit loss			122,424
Substandard | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	185,207
Total Classified
Allowance for loan losses
Financing receivable, before allowance for credit loss			162,064
Total Classified | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	250,155
Special Mention
Allowance for loan losses
Financing receivable, before allowance for credit loss			75,284
Special Mention | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	109,299
Total Criticized
Allowance for loan losses
Financing receivable, before allowance for credit loss			$ 237,348
Total Criticized | Performing
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 359,454

LOANS AND RELATED ALLOWANCE _12

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Non-accrual loans	$ 64,948	$ 39,640	$ 39,640
Real Estate
Allowance for loan losses
Non-accrual loans	43,505
Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	36
Other
Allowance for loan losses
Non-accrual loans	3,758
Commercial loans | Commercial multifamily
Allowance for loan losses
Non-accrual loans	757	811
Commercial loans | Commercial multifamily | Real Estate
Allowance for loan losses
Non-accrual loans	591
Commercial loans | Commercial multifamily | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Commercial loans | Commercial multifamily | Other
Allowance for loan losses
Non-accrual loans	0
Commercial real estate loans
Allowance for loan losses
Non-accrual loans			20,119
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Non-accrual loans	4,509	15,389
Commercial real estate loans | Commercial real estate owner occupied | Real Estate
Allowance for loan losses
Non-accrual loans	5,714
Commercial real estate loans | Commercial real estate owner occupied | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Commercial real estate loans | Commercial real estate owner occupied | Other
Allowance for loan losses
Non-accrual loans	0
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Non-accrual loans	29,572	1,031
Commercial real estate loans | Commercial real estate non-owner occupied | Real Estate
Allowance for loan losses
Non-accrual loans	30,950
Commercial real estate loans | Commercial real estate non-owner occupied | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Commercial real estate loans | Commercial real estate non-owner occupied | Other
Allowance for loan losses
Non-accrual loans	0
Commercial and industrial loans
Allowance for loan losses
Non-accrual loans	12,441	11,218	11,373
Commercial and industrial loans | Real Estate
Allowance for loan losses
Non-accrual loans	973
Commercial and industrial loans | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	36
Commercial and industrial loans | Other
Allowance for loan losses
Non-accrual loans	3,758
Residential real estate
Allowance for loan losses
Non-accrual loans			3,343
Residential real estate | Residential real estate
Allowance for loan losses
Non-accrual loans	9,711	6,411
Residential real estate | Residential real estate | Real Estate
Allowance for loan losses
Non-accrual loans	5,081
Residential real estate | Residential real estate | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Residential real estate | Residential real estate | Other
Allowance for loan losses
Non-accrual loans	0
Consumer loans
Allowance for loan losses
Non-accrual loans			4,805
Consumer loans | Home equity
Allowance for loan losses
Non-accrual loans	2,654	1,798	$ 1,812
Consumer loans | Home equity | Real Estate
Allowance for loan losses
Non-accrual loans	145
Consumer loans | Home equity | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Consumer loans | Home equity | Other
Allowance for loan losses
Non-accrual loans	0
Consumer loans | Consumer other
Allowance for loan losses
Non-accrual loans	5,304	$ 2,982
Consumer loans | Consumer other | Real Estate
Allowance for loan losses
Non-accrual loans	51
Consumer loans | Consumer other | Investment Securities/Cash
Allowance for loan losses
Non-accrual loans	0
Consumer loans | Consumer other | Other
Allowance for loan losses
Non-accrual loans	$ 0

LOANS AND RELATED ALLOWANCE _13

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Schedule of Troubled Debt Restructurings, Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	$ 19,316	$ 27,415	$ 41,990
Principal Payments	(6,257)	(6,086)	(8,547)
TDR Status Change	0	0	0
Other Additions/(Reductions)	(4,708)	(4,076)	(8,713)
Newly Identified TDRs	12,197	2,063	2,685
Balance at End of Period	20,548	19,316	$ 27,415
Commercial loans | Commercial multifamily
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	793
Principal Payments	(39)
TDR Status Change	0
Other Additions/(Reductions)	0
Newly Identified TDRs	0
Balance at End of Period	754	793
Commercial real estate loans | Commercial real estate owner occupied
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	13,331
Principal Payments	(5,734)
TDR Status Change	0
Other Additions/(Reductions)	(5,884)
Newly Identified TDRs	18
Balance at End of Period	1,731	13,331
Commercial real estate loans | Commercial real estate non-owner occupied
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	1,373
Principal Payments	(1)
TDR Status Change	0
Other Additions/(Reductions)	1,719
Newly Identified TDRs	10,593
Balance at End of Period	13,684	1,373
Commercial and industrial loans
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	1,449
Principal Payments	(289)
TDR Status Change	0
Other Additions/(Reductions)	(60)
Newly Identified TDRs	1,586
Balance at End of Period	2,686	1,449
Residential real estate | Residential real estate
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	2,045
Principal Payments	(160)
TDR Status Change	0
Other Additions/(Reductions)	(361)
Newly Identified TDRs	0
Balance at End of Period	1,524	2,045
Consumer loans | Home equity
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	277
Principal Payments	(22)
TDR Status Change	0
Other Additions/(Reductions)	(122)
Newly Identified TDRs	0
Balance at End of Period	133	277
Consumer loans | Consumer other
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	48
Principal Payments	(12)
TDR Status Change	0
Other Additions/(Reductions)	0
Newly Identified TDRs	0
Balance at End of Period	$ 36	$ 48

LOANS AND RELATED ALLOWANCE _14

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)Loan	Dec. 31, 2019USD ($)Loan	Dec. 31, 2018USD ($)Loan
Credit Loss [Abstract]
Number of loans | Loan	16,000	13,000	10,000
Pre-modification outstanding recorded investment	$ 12,197	$ 2,063	$ 2,685
Post-modification outstanding recorded investment	$ 12,197	$ 2,063	$ 2,685

LOANS AND RELATED ALLOWANCE _15

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - TDR (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020Loan	Dec. 31, 2019USD ($)Loan
Allowance for loan losses
Number of Loans | Loan	0	1
Recorded Investment | $		$ 195
Commercial and industrial loans | Commercial and industrial - other
Allowance for loan losses
Number of Loans | Loan		1
Recorded Investment | $		$ 195

LOANS AND RELATED ALLOWANCE _16

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Total Loans - Prior to Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total loans	$ 8,081,519	$ 9,502,428	$ 9,502,428
Commercial real estate loans
Allowance for loan losses
Total loans			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Total loans			429,806
Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total loans			3,604,463
Commercial and industrial loans
Allowance for loan losses
Total loans	1,943,164	1,843,683	1,840,508
Commercial loans
Allowance for loan losses
Total loans			5,874,777
Commercial loans | Construction
Allowance for loan losses
Total loans	454,513	448,452	448,452
Residential real estate
Allowance for loan losses
Total loans			2,685,472
Residential real estate | Construction
Allowance for loan losses
Total loans			8,119
Residential real estate | 1-4 family
Allowance for loan losses
Total loans			2,677,353
Consumer loans
Allowance for loan losses
Total loans			942,179
Consumer loans | Home equity
Allowance for loan losses
Total loans	$ 293,981	$ 378,793	380,591
Consumer loans | Auto and other
Allowance for loan losses
Total loans			561,588
Business Activities Loans
Allowance for loan losses
Total loans			7,166,497
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Total loans			2,796,956
Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Total loans			382,014
Business Activities Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total loans			2,414,942
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Total loans			1,442,617
Business Activities Loans | Commercial loans
Allowance for loan losses
Total loans			4,239,573
Business Activities Loans | Residential real estate
Allowance for loan losses
Total loans			2,148,458
Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Total loans			4,641
Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Total loans			2,143,817
Business Activities Loans | Consumer loans
Allowance for loan losses
Total loans			778,466
Business Activities Loans | Consumer loans | Home equity
Allowance for loan losses
Total loans			273,867
Business Activities Loans | Consumer loans | Auto and other
Allowance for loan losses
Total loans			504,599
Acquired Loans
Allowance for loan losses
Total loans			2,335,931
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Total loans			1,237,313
Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Total loans			47,792
Acquired Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total loans			1,189,521
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Total loans			397,891
Acquired Loans | Commercial loans
Allowance for loan losses
Total loans			1,635,204
Acquired Loans | Residential real estate
Allowance for loan losses
Total loans			537,014
Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Total loans			3,478
Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Total loans			533,536
Acquired Loans | Consumer loans
Allowance for loan losses
Total loans			163,713
Acquired Loans | Consumer loans | Home equity
Allowance for loan losses
Total loans			106,724
Acquired Loans | Consumer loans | Auto and other
Allowance for loan losses
Total loans			$ 56,989

LOANS AND RELATED ALLOWANCE _17

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Unamortized Net Costs and Premiums (Details) $ in Thousands	Dec. 31, 2019USD ($)
Credit Loss [Abstract]
Unamortized net loan origination costs	$ 13,259
Unamortized net premium on purchased loans	2,643
Total unamortized net costs and premiums	$ 15,902

LOANS AND RELATED ALLOWANCE _18

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loans and Debt Securities Acquired with Deteriorated Credit Quality (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 2,840	$ 11,561
Acquisitions	4,200	0
Accretion	(9,619)	(23,109)
Net reclassification from nonaccretable difference	7,430	17,347
Payments received, net	(837)	(2,878)
Reclassification to TDR	9	0
Disposals	0	(81)
Balance at end of period	$ 4,023	$ 2,840

LOANS AND RELATED ALLOWANCE _19

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loans Past Due - Pre Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total Past Due	$ 92,708
Current	7,988,811
Total loans	8,081,519	$ 9,502,428	$ 9,502,428
Past Due 90 Days or Greater and Accruing	11,450
Commercial real estate loans
Allowance for loan losses
Total loans			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Total loans			429,806
Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total loans			3,604,463
Commercial and industrial loans
Allowance for loan losses
Total Past Due	19,257
Current	1,923,907
Total loans	1,943,164	1,843,683	1,840,508
Past Due 90 Days or Greater and Accruing	541
Residential real estate
Allowance for loan losses
Total loans			2,685,472
Residential real estate | Construction
Allowance for loan losses
Total loans			8,119
Residential real estate | 1-4 family
Allowance for loan losses
Total loans			2,677,353
Consumer loans
Allowance for loan losses
Total loans			942,179
Consumer loans | Home equity
Allowance for loan losses
Total Past Due	3,425
Current	290,556
Total loans	293,981	$ 378,793	380,591
Past Due 90 Days or Greater and Accruing	243
Consumer loans | Auto and other
Allowance for loan losses
Total loans			561,588
30-59 Days Past Due
Allowance for loan losses
Total Past Due	8,561
30-59 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	3,016
30-59 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	244
60-89 Days Past Due
Allowance for loan losses
Total Past Due	7,749
60-89 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	3,259
60-89 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	284
90 Days or Greater Past Due
Allowance for loan losses
Total Past Due	76,398
90 Days or Greater Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due	12,982
90 Days or Greater Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due	$ 2,897
Business Activities Loans
Allowance for loan losses
Total Past Due			47,128
Current			7,119,369
Total loans			7,166,497
Past Due 90 Days or Greater and Accruing			975
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Total Past Due			16,135
Current			2,780,821
Total loans			2,796,956
Past Due 90 Days or Greater and Accruing			0
Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Current			382,014
Total loans			382,014
Past Due 90 Days or Greater and Accruing			0
Business Activities Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			16,135
Current			2,398,807
Total loans			2,414,942
Past Due 90 Days or Greater and Accruing			0
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Total Past Due			15,536
Current			1,427,081
Total loans			1,442,617
Past Due 90 Days or Greater and Accruing			122
Business Activities Loans | Residential real estate
Allowance for loan losses
Total Past Due			5,733
Current			2,142,725
Total loans			2,148,458
Past Due 90 Days or Greater and Accruing			800
Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Current			4,641
Total loans			4,641
Past Due 90 Days or Greater and Accruing			0
Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			5,733
Current			2,138,084
Total loans			2,143,817
Past Due 90 Days or Greater and Accruing			800
Business Activities Loans | Consumer loans
Allowance for loan losses
Total Past Due			9,724
Current			768,742
Total loans			778,466
Past Due 90 Days or Greater and Accruing			53
Business Activities Loans | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			1,296
Current			272,571
Total loans			273,867
Past Due 90 Days or Greater and Accruing			52
Business Activities Loans | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			8,428
Current			496,171
Total loans			504,599
Past Due 90 Days or Greater and Accruing			1
Business Activities Loans | 30-59 Days Past Due
Allowance for loan losses
Total Past Due			9,791
Business Activities Loans | 30-59 Days Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			423
Business Activities Loans | 30-59 Days Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 30-59 Days Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			423
Business Activities Loans | 30-59 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			2,841
Business Activities Loans | 30-59 Days Past Due | Residential real estate
Allowance for loan losses
Total Past Due			1,669
Business Activities Loans | 30-59 Days Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 30-59 Days Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			1,669
Business Activities Loans | 30-59 Days Past Due | Consumer loans
Allowance for loan losses
Total Past Due			4,858
Business Activities Loans | 30-59 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			149
Business Activities Loans | 30-59 Days Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			4,709
Business Activities Loans | 60-89 Days Past Due
Allowance for loan losses
Total Past Due			3,826
Business Activities Loans | 60-89 Days Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			89
Business Activities Loans | 60-89 Days Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 60-89 Days Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			89
Business Activities Loans | 60-89 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			2,033
Business Activities Loans | 60-89 Days Past Due | Residential real estate
Allowance for loan losses
Total Past Due			714
Business Activities Loans | 60-89 Days Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 60-89 Days Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			714
Business Activities Loans | 60-89 Days Past Due | Consumer loans
Allowance for loan losses
Total Past Due			990
Business Activities Loans | 60-89 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 60-89 Days Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			990
Business Activities Loans | 90 Days or Greater Past Due
Allowance for loan losses
Total Past Due			33,511
Business Activities Loans | 90 Days or Greater Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			15,623
Business Activities Loans | 90 Days or Greater Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 90 Days or Greater Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			15,623
Business Activities Loans | 90 Days or Greater Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			10,662
Business Activities Loans | 90 Days or Greater Past Due | Residential real estate
Allowance for loan losses
Total Past Due			3,350
Business Activities Loans | 90 Days or Greater Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Business Activities Loans | 90 Days or Greater Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			3,350
Business Activities Loans | 90 Days or Greater Past Due | Consumer loans
Allowance for loan losses
Total Past Due			3,876
Business Activities Loans | 90 Days or Greater Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			1,147
Business Activities Loans | 90 Days or Greater Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			2,729
Acquired Loans
Allowance for loan losses
Total Past Due			20,793
Total loans			2,335,931
Past Due 90 Days or Greater and Accruing			6,404
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Total Past Due			14,399
Total loans			1,237,313
Past Due 90 Days or Greater and Accruing			5,751
Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Total loans			47,792
Past Due 90 Days or Greater and Accruing			0
Acquired Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			14,399
Total loans			1,189,521
Past Due 90 Days or Greater and Accruing			5,751
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Total Past Due			2,462
Total loans			397,891
Past Due 90 Days or Greater and Accruing			442
Acquired Loans | Residential real estate
Allowance for loan losses
Total Past Due			2,168
Total loans			537,014
Past Due 90 Days or Greater and Accruing			139
Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Total loans			3,478
Past Due 90 Days or Greater and Accruing			0
Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			2,168
Total loans			533,536
Past Due 90 Days or Greater and Accruing			139
Acquired Loans | Consumer loans
Allowance for loan losses
Total Past Due			1,764
Total loans			163,713
Past Due 90 Days or Greater and Accruing			72
Acquired Loans | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			1,357
Total loans			106,724
Past Due 90 Days or Greater and Accruing			72
Acquired Loans | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			407
Total loans			56,989
Past Due 90 Days or Greater and Accruing			0
Acquired Loans | 30-59 Days Past Due
Allowance for loan losses
Total Past Due			6,006
Acquired Loans | 30-59 Days Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			3,907
Acquired Loans | 30-59 Days Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 30-59 Days Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			3,907
Acquired Loans | 30-59 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			888
Acquired Loans | 30-59 Days Past Due | Residential real estate
Allowance for loan losses
Total Past Due			745
Acquired Loans | 30-59 Days Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 30-59 Days Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			745
Acquired Loans | 30-59 Days Past Due | Consumer loans
Allowance for loan losses
Total Past Due			466
Acquired Loans | 30-59 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			346
Acquired Loans | 30-59 Days Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			120
Acquired Loans | 60-89 Days Past Due
Allowance for loan losses
Total Past Due			1,279
Acquired Loans | 60-89 Days Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			245
Acquired Loans | 60-89 Days Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 60-89 Days Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			245
Acquired Loans | 60-89 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			299
Acquired Loans | 60-89 Days Past Due | Residential real estate
Allowance for loan losses
Total Past Due			491
Acquired Loans | 60-89 Days Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 60-89 Days Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			491
Acquired Loans | 60-89 Days Past Due | Consumer loans
Allowance for loan losses
Total Past Due			244
Acquired Loans | 60-89 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			222
Acquired Loans | 60-89 Days Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			22
Acquired Loans | 90 Days or Greater Past Due
Allowance for loan losses
Total Past Due			13,508
Acquired Loans | 90 Days or Greater Past Due | Commercial real estate loans
Allowance for loan losses
Total Past Due			10,247
Acquired Loans | 90 Days or Greater Past Due | Commercial real estate loans | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 90 Days or Greater Past Due | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Total Past Due			10,247
Acquired Loans | 90 Days or Greater Past Due | Commercial and industrial loans
Allowance for loan losses
Total Past Due			1,275
Acquired Loans | 90 Days or Greater Past Due | Residential real estate
Allowance for loan losses
Total Past Due			932
Acquired Loans | 90 Days or Greater Past Due | Residential real estate | Construction
Allowance for loan losses
Total Past Due			0
Acquired Loans | 90 Days or Greater Past Due | Residential real estate | 1-4 family
Allowance for loan losses
Total Past Due			932
Acquired Loans | 90 Days or Greater Past Due | Consumer loans
Allowance for loan losses
Total Past Due			1,054
Acquired Loans | 90 Days or Greater Past Due | Consumer loans | Home equity
Allowance for loan losses
Total Past Due			789
Acquired Loans | 90 Days or Greater Past Due | Consumer loans | Auto and other
Allowance for loan losses
Total Past Due			$ 265

LOANS AND RELATED ALLOWANCE _20

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Nonaccrual Loans and Loans Past Due - Pre Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Non-accrual loans	$ 64,948	$ 39,640	$ 39,640
Commercial real estate loans
Allowance for loan losses
Non-accrual loans			20,119
Commercial real estate loans | Construction
Allowance for loan losses
Non-accrual loans			0
Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Non-accrual loans			20,119
Commercial and industrial loans
Allowance for loan losses
Non-accrual loans	12,441	11,218	11,373
Residential real estate
Allowance for loan losses
Non-accrual loans			3,343
Residential real estate | Construction
Allowance for loan losses
Non-accrual loans			0
Residential real estate | 1-4 family
Allowance for loan losses
Non-accrual loans			3,343
Consumer loans
Allowance for loan losses
Non-accrual loans			4,805
Consumer loans | Home equity
Allowance for loan losses
Non-accrual loans	$ 2,654	$ 1,798	1,812
Consumer loans | Auto and other
Allowance for loan losses
Non-accrual loans			2,993
Business Activities Loans
Allowance for loan losses
Non-accrual loans			32,536
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Non-accrual loans			15,623
Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Non-accrual loans			0
Business Activities Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Non-accrual loans			15,623
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Non-accrual loans			10,540
Business Activities Loans | Residential real estate
Allowance for loan losses
Non-accrual loans			2,550
Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Non-accrual loans			0
Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Non-accrual loans			2,550
Business Activities Loans | Consumer loans
Allowance for loan losses
Non-accrual loans			3,823
Business Activities Loans | Consumer loans | Home equity
Allowance for loan losses
Non-accrual loans			1,095
Business Activities Loans | Consumer loans | Auto and other
Allowance for loan losses
Non-accrual loans			2,728
Acquired Loans
Allowance for loan losses
Non-accrual loans			7,104
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Non-accrual loans			4,496
Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Non-accrual loans			0
Acquired Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Non-accrual loans			4,496
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Non-accrual loans			833
Acquired Loans | Residential real estate
Allowance for loan losses
Non-accrual loans			793
Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Non-accrual loans			0
Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Non-accrual loans			793
Acquired Loans | Consumer loans
Allowance for loan losses
Non-accrual loans			982
Acquired Loans | Consumer loans | Home equity
Allowance for loan losses
Non-accrual loans			717
Acquired Loans | Consumer loans | Auto and other
Allowance for loan losses
Non-accrual loans			$ 265

LOANS AND RELATED ALLOWANCE _21

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Loans Evaluated For Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Total	$ 8,081,519	$ 9,502,428	$ 9,502,428
Commercial real estate loans
Allowance for loan losses
Total			4,034,269
Commercial and industrial loans
Allowance for loan losses
Total	$ 1,943,164	$ 1,843,683	1,840,508
Residential real estate
Allowance for loan losses
Total			2,685,472
Consumer
Allowance for loan losses
Total			942,179
Business Activities Loans
Allowance for loan losses
Individually evaluated for impairment			32,008
Collectively evaluated			7,134,489
Total			7,166,497
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Individually evaluated for impairment			19,192
Collectively evaluated			2,777,764
Total			2,796,956
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Individually evaluated for impairment			9,167
Collectively evaluated			1,433,450
Total			1,442,617
Business Activities Loans | Residential real estate
Allowance for loan losses
Individually evaluated for impairment			3,019
Collectively evaluated			2,145,439
Total			2,148,458
Business Activities Loans | Consumer
Allowance for loan losses
Individually evaluated for impairment			630
Collectively evaluated			777,836
Total			778,466
Acquired Loans
Allowance for loan losses
Individually evaluated for impairment			5,652
Purchased credit-impaired loans			61,419
Collectively evaluated			2,268,860
Total			2,335,931
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Individually evaluated for impairment			4,241
Purchased credit-impaired loans			23,035
Collectively evaluated			1,210,037
Total			1,237,313
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Individually evaluated for impairment			464
Purchased credit-impaired loans			26,718
Collectively evaluated			370,709
Total			397,891
Acquired Loans | Residential real estate
Allowance for loan losses
Individually evaluated for impairment			372
Purchased credit-impaired loans			10,840
Collectively evaluated			525,802
Total			537,014
Acquired Loans | Consumer
Allowance for loan losses
Individually evaluated for impairment			575
Purchased credit-impaired loans			826
Collectively evaluated			162,312
Total			$ 163,713

LOANS AND RELATED ALLOWANCE _22

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Impaired Loans (Details) $ in Thousands	Dec. 31, 2019USD ($)
Business Activities Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	$ 31,879
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	65,627
Related Allowance
Related Allowance	294
Business Activities Loans | Commercial real estate loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	19,226
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	38,904
Related Allowance
Related Allowance	20
Business Activities Loans | Commercial real estate loans | Commercial and industrial - other
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	18,676
With an allowance recorded	550
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	37,493
With an allowance recorded	1,411
Related Allowance
Related Allowance	20
Business Activities Loans | Commercial and industrial loans
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	4,805
With an allowance recorded	4,166
Total	8,971
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	10,104
With an allowance recorded	12,136
Total	22,240
Related Allowance
Related Allowance	122
Business Activities Loans | Residential real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	3,048
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	3,623
Related Allowance
Related Allowance	109
Business Activities Loans | Residential real estate | 1-4 Family
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	433
With an allowance recorded	2,615
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	699
With an allowance recorded	2,924
Related Allowance
Related Allowance	109
Business Activities Loans | Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	634
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	860
Related Allowance
Related Allowance	43
Business Activities Loans | Consumer | Commercial and industrial - other
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	0
With an allowance recorded	8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	0
With an allowance recorded	8
Related Allowance
Related Allowance	1
Business Activities Loans | Consumer | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	32
With an allowance recorded	594
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	238
With an allowance recorded	614
Related Allowance
Related Allowance	42
Acquired Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	5,650
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	9,040
Related Allowance
Related Allowance	118
Acquired Loans | Commercial real estate loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	4,233
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	7,071
Related Allowance
Related Allowance	97
Acquired Loans | Commercial real estate loans | Commercial and industrial - other
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	3,200
With an allowance recorded	1,033
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	6,021
With an allowance recorded	1,050
Related Allowance
Related Allowance	97
Acquired Loans | Commercial and industrial loans
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	437
With an allowance recorded	28
Total	465
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	532
With an allowance recorded	30
Total	562
Related Allowance
Related Allowance	1
Acquired Loans | Residential real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	376
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	403
Related Allowance
Related Allowance	8
Acquired Loans | Residential real estate | 1-4 Family
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	292
With an allowance recorded	84
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	293
With an allowance recorded	110
Related Allowance
Related Allowance	8
Acquired Loans | Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	576
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	1,004
Related Allowance
Related Allowance	12
Acquired Loans | Consumer | Commercial and industrial - other
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	0
With an allowance recorded	39
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	0
With an allowance recorded	37
Related Allowance
Related Allowance	6
Acquired Loans | Consumer | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	416
With an allowance recorded	121
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	844
With an allowance recorded	123
Related Allowance
Related Allowance	$ 6

LOANS AND RELATED ALLOWANCE _23

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Activities Loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	$ 28,997	$ 28,861
Impaired financing receivable, interest income, cash basis method	2,212	899
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	20,179	24,633
Impaired financing receivable, interest income, cash basis method	693	403
Business Activities Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	19,805	24,078
Cash basis interest income recognized, with no related allowance	586	373
Average recorded investment with related allowance	374	555
Cash basis interest income recognized, with related allowance	107	30
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	5,698	2,173
Impaired financing receivable, interest income, cash basis method	1,316	384
Business Activities Loans | Commercial and industrial loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	3,165	914
Cash basis interest income recognized, with no related allowance	523	245
Average recorded investment with related allowance	2,533	1,259
Cash basis interest income recognized, with related allowance	793	139
Business Activities Loans | Residential real estate
Allowance for loan losses
Impaired financing receivable, average recorded investment	2,612	1,835
Impaired financing receivable, interest income, cash basis method	167	95
Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Average recorded investment, with no related allowance	185	428
Cash basis interest income recognized, with no related allowance	17	20
Average recorded investment with related allowance	2,427	1,407
Cash basis interest income recognized, with related allowance	150	75
Business Activities Loans | Consumer loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	508	220
Impaired financing receivable, interest income, cash basis method	36	17
Business Activities Loans | Consumer loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Average recorded investment with related allowance	11	15
Cash basis interest income recognized, with related allowance	1	1
Business Activities Loans | Consumer loans | Home equity
Allowance for loan losses
Average recorded investment, with no related allowance	148	107
Cash basis interest income recognized, with no related allowance	3	10
Average recorded investment with related allowance	349	98
Cash basis interest income recognized, with related allowance	32	6
Acquired Loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	3,991	5,919
Impaired financing receivable, interest income, cash basis method	278	463
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	2,608	4,230
Impaired financing receivable, interest income, cash basis method	176	316
Acquired Loans | Commercial real estate loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	1,603	3,280
Cash basis interest income recognized, with no related allowance	117	263
Average recorded investment with related allowance	1,005	950
Cash basis interest income recognized, with related allowance	59	53
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	470	625
Impaired financing receivable, interest income, cash basis method	53	109
Acquired Loans | Commercial and industrial loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	441	428
Cash basis interest income recognized, with no related allowance	51	68
Average recorded investment with related allowance	29	197
Cash basis interest income recognized, with related allowance	2	41
Acquired Loans | Residential real estate
Allowance for loan losses
Impaired financing receivable, average recorded investment	329	316
Impaired financing receivable, interest income, cash basis method	18	18
Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Average recorded investment, with no related allowance	241	290
Cash basis interest income recognized, with no related allowance	11	9
Average recorded investment with related allowance	88	26
Cash basis interest income recognized, with related allowance	7	9
Acquired Loans | Consumer loans
Allowance for loan losses
Impaired financing receivable, average recorded investment	584	748
Impaired financing receivable, interest income, cash basis method	31	20
Acquired Loans | Consumer loans | Commercial and industrial - other
Allowance for loan losses
Average recorded investment, with no related allowance	0	13
Cash basis interest income recognized, with no related allowance	0	1
Average recorded investment with related allowance	41	11
Cash basis interest income recognized, with related allowance	2	3
Acquired Loans | Consumer loans | Home equity
Allowance for loan losses
Average recorded investment, with no related allowance	475	635
Cash basis interest income recognized, with no related allowance	23	4
Average recorded investment with related allowance	68	89
Cash basis interest income recognized, with related allowance	$ 6	$ 12

LOANS AND RELATED ALLOWANCE _24

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Schedule of Troubled Debt Restructurings, Activity - Pre Adoption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at Beginning of Period	$ 19,316	$ 27,415	$ 41,990
Principal Payments	(6,257)	(6,086)	(8,547)
TDR Status Change	0	0	0
Other Additions/(Reductions)	(4,708)	(4,076)	(8,713)
Newly Identified TDRs	12,197	2,063	2,685
Balance at End of Period	$ 20,548	$ 19,316	$ 27,415

LOANS AND RELATED ALLOWANCE _25

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Activity for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 63,575
Recoveries	8,005
Provision for Credit Losses	76,083
Balance at End of Period	127,302	$ 63,575
Total	127,302	63,575		$ 63,575	$ 63,575
Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	20,099
Recoveries	4,285
Provision for Credit Losses	22,146
Balance at End of Period	25,013	20,099
Total	25,013	20,099			20,099
Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	57,176	56,139	$ 45,920
Charged-off loans		34,333	13,478
Recoveries		1,892	1,147
Provision for Credit Losses		33,478	22,550
Balance at End of Period		57,176	56,139
Individually evaluated for impairment					294	$ 197
Collectively evaluated					56,882	55,942
Total	57,176	56,139	56,139		57,176	56,139
Business Activities Loans | Commercial real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	24,758	21,732	16,843
Charged-off loans		6,577	5,859
Recoveries		570	50
Provision for Credit Losses		9,033	10,698
Balance at End of Period		24,758	21,732
Individually evaluated for impairment					20	9
Collectively evaluated					24,738	21,723
Total	24,758	24,758	16,843		24,758	21,732
Business Activities Loans | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	19,121	16,504	13,850
Charged-off loans		23,799	4,275
Recoveries		1,012	620
Provision for Credit Losses		25,404	6,309
Balance at End of Period		19,121	16,504
Individually evaluated for impairment					122	49
Collectively evaluated					18,999	16,455
Total	19,121	16,504	16,504		19,121	16,504
Business Activities Loans | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	8,540	10,535	9,420
Charged-off loans		635	157
Recoveries		57	114
Provision for Credit Losses		(1,417)	1,158
Balance at End of Period		8,540	10,535
Individually evaluated for impairment					109	128
Collectively evaluated					8,431	10,407
Total	8,540	8,540	9,420		8,540	10,535
Business Activities Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	4,757	7,368	5,807
Charged-off loans		3,322	3,187
Recoveries		253	363
Provision for Credit Losses		458	4,385
Balance at End of Period		4,757	7,368
Individually evaluated for impairment					43	11
Collectively evaluated					4,714	7,357
Total	4,757	4,757	5,807		4,757	7,368
Acquired Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	6,399	5,330	5,914
Charged-off loans		2,221	4,533
Recoveries		1,349	1,048
Provision for Credit Losses		1,941	2,901
Balance at End of Period		6,399	5,330
Individually evaluated for impairment					118	97
Collectively evaluated					6,281	5,233
Total	6,399	6,399	5,914		6,399	5,330
Acquired Loans | Commercial real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	4,106	3,153	3,856
Charged-off loans		830	1,812
Recoveries		672	294
Provision for Credit Losses		1,111	815
Balance at End of Period		4,106	3,153
Individually evaluated for impairment					97	9
Collectively evaluated					4,009	3,144
Total	4,106	3,153	3,153		4,106	3,153
Acquired Loans | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	1,057	1,064	1,125
Charged-off loans		571	524
Recoveries		438	286
Provision for Credit Losses		126	177
Balance at End of Period		1,057	1,064
Individually evaluated for impairment					1	4
Collectively evaluated					1,056	1,060
Total	1,057	1,064	1,064		1,057	1,064
Acquired Loans | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	848	630	598
Charged-off loans		263	1,091
Recoveries		116	51
Provision for Credit Losses		365	1,072
Balance at End of Period		848	630
Individually evaluated for impairment					8	36
Collectively evaluated					840	594
Total	848	630	630		848	630
Acquired Loans | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	388	483	335
Charged-off loans		557	1,106
Recoveries		123	417
Provision for Credit Losses		339	837
Balance at End of Period		388	483
Individually evaluated for impairment					12	48
Collectively evaluated					376	435
Total	$ 388	$ 483	$ 483		$ 388	$ 483

LOANS AND RELATED ALLOWANCE _26

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Credit Risk Profile by Creditworthiness Category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 8,081,519	$ 9,502,428	$ 9,502,428
Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,034,269
Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			429,806
Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss	1,943,164	1,843,683	1,840,508
Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,685,472
Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			8,119
Residential real estate | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss	1,931,681	2,853,385	2,853,385
Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,677,353
Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			942,179
Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss	293,981	$ 378,793	380,591
Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			561,588
Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			7,166,497
Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,796,956
Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			382,014
Business Activities Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,414,942
Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,442,617
Business Activities Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,148,458
Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,641
Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,143,817
Business Activities Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			778,466
Business Activities Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			273,867
Business Activities Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			504,599
Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,335,931
Acquired Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,237,313
Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			47,792
Acquired Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,189,521
Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			397,891
Acquired Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			537,014
Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			3,478
Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			533,536
Acquired Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			163,713
Acquired Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			106,724
Acquired Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			56,989
Pass | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss	1,815,259
Pass | Residential real estate | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss	1,917,026
Pass | Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,736,389
Pass | Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			382,014
Pass | Business Activities Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,354,375
Pass | Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,366,342
Pass | Business Activities Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,144,394
Pass | Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,641
Pass | Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,139,753
Pass | Acquired Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,176,729
Pass | Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			46,396
Pass | Acquired Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,130,333
Pass | Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			373,744
Pass | Acquired Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			531,760
Pass | Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			3,478
Pass | Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			528,282
Special Mention
Allowance for loan losses
Financing receivable, before allowance for credit loss			75,284
Special Mention | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss	29,412
Special Mention | Residential real estate | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss	2,630
Special Mention | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			63,943
Special Mention | Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			12,167
Special Mention | Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Special Mention | Business Activities Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			12,167
Special Mention | Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			50,072
Special Mention | Business Activities Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			714
Special Mention | Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Special Mention | Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			714
Special Mention | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			11,341
Special Mention | Acquired Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			5,993
Special Mention | Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Special Mention | Acquired Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			5,993
Special Mention | Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,404
Special Mention | Acquired Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			592
Special Mention | Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Special Mention | Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			592
Substandard
Allowance for loan losses
Financing receivable, before allowance for credit loss			122,424
Substandard | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss	98,163
Substandard | Residential real estate | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss	12,025
Substandard | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			49,293
Substandard | Business Activities Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			48,400
Substandard | Business Activities Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Substandard | Business Activities Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			48,400
Substandard | Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			24,112
Substandard | Business Activities Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			3,350
Substandard | Business Activities Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Substandard | Business Activities Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			3,350
Substandard | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			73,131
Substandard | Acquired Loans | Commercial real estate loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			54,591
Substandard | Acquired Loans | Commercial real estate loans | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,396
Substandard | Acquired Loans | Commercial real estate loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			53,195
Substandard | Acquired Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			19,743
Substandard | Acquired Loans | Residential real estate
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,662
Substandard | Acquired Loans | Residential real estate | Construction
Allowance for loan losses
Financing receivable, before allowance for credit loss			0
Substandard | Acquired Loans | Residential real estate | 1-4 family
Allowance for loan losses
Financing receivable, before allowance for credit loss			4,662
Doubtful | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss	330
Doubtful | Business Activities Loans | Commercial and industrial loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,091
Performing | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss	291,084
Performing | Business Activities Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			774,643
Performing | Business Activities Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			272,772
Performing | Business Activities Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			501,871
Performing | Acquired Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			162,731
Performing | Acquired Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			106,007
Performing | Acquired Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			56,724
Performing | Special Mention
Allowance for loan losses
Financing receivable, before allowance for credit loss	109,299
Performing | Substandard
Allowance for loan losses
Financing receivable, before allowance for credit loss	185,207
Nonperforming | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 2,897
Nonperforming | Business Activities Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			3,823
Nonperforming | Business Activities Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			1,095
Nonperforming | Business Activities Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,728
Nonperforming | Acquired Loans | Consumer
Allowance for loan losses
Financing receivable, before allowance for credit loss			982
Nonperforming | Acquired Loans | Consumer | Home equity
Allowance for loan losses
Financing receivable, before allowance for credit loss			717
Nonperforming | Acquired Loans | Consumer | Auto and other
Allowance for loan losses
Financing receivable, before allowance for credit loss			$ 265

LOANS AND RELATED ALLOWANCE _27

LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Summary of Total Loans Rated Special Mention or Lower - Pre Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Allowance for loan losses
Financing receivable, before allowance for credit loss	$ 8,081,519	$ 9,502,428	$ 9,502,428
Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			7,166,497
Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			2,335,931
Non-Accrual
Allowance for loan losses
Financing receivable, before allowance for credit loss			39,640
Non-Accrual | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			32,536
Non-Accrual | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			7,104
Substandard
Allowance for loan losses
Financing receivable, before allowance for credit loss			122,424
Substandard | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			49,293
Substandard | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			73,131
Total Classified
Allowance for loan losses
Financing receivable, before allowance for credit loss			162,064
Total Classified | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			81,829
Total Classified | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			80,235
Special Mention
Allowance for loan losses
Financing receivable, before allowance for credit loss			75,284
Special Mention | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			63,943
Special Mention | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			11,341
Total Criticized
Allowance for loan losses
Financing receivable, before allowance for credit loss			237,348
Total Criticized | Business Activities Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			145,772
Total Criticized | Acquired Loans
Allowance for loan losses
Financing receivable, before allowance for credit loss			$ 91,576

PREMISES AND EQUIPMENT (Details

PREMISES AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Premises and equipment
Premises and equipment, gross	$ 199,194	$ 200,437
Accumulated depreciation and amortization	(86,531)	(78,966)
Depreciation and amortization expense	12,500	11,800	$ 10,800
Land
Premises and equipment
Premises and equipment, gross	17,716	17,816
Buildings and improvements
Premises and equipment
Premises and equipment, gross	$ 113,853	116,997
Buildings and improvements | Minimum
Premises and equipment
Estimated Useful Life	5 years
Buildings and improvements | Maximum
Premises and equipment
Estimated Useful Life	39 years
Furniture and equipment
Premises and equipment
Premises and equipment, gross	$ 63,590	64,044
Furniture and equipment | Minimum
Premises and equipment
Estimated Useful Life	3 years
Furniture and equipment | Maximum
Premises and equipment
Estimated Useful Life	7 years
Construction in process
Premises and equipment
Premises and equipment, gross	$ 4,035	1,580
Continuing and Discontinued Operations
Premises and equipment
Premises and equipment, net	112,663	121,471
Discontinued Operations
Premises and equipment
Premises and equipment, net	0	1,073
Continuing Operations
Premises and equipment
Premises and equipment, net	$ 112,663	$ 120,398

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)acquisition	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of significant acquisitions completed (acquisition) | acquisition	0
Goodwill impairment	$ 553,762,000	$ 0	$ 0
Amortization of intangible assets	6,200,000	5,800,000	4,900,000
Finite-lived intangible assets, amortization expense, 2020	5,300,000
Finite-lived intangible assets, amortization expense, 2021	5,100,000
Finite-lived intangible assets, amortization expense, 2022	4,800,000
Finite-lived intangible assets, amortization expense, 2023	4,600,000
Finite-lived intangible assets, amortization expense, 2024	4,500,000
Finite-lived intangible assets, amortization expense, thereafter	10,600,000
Impairment of intangible assets, finite-lived	$ 0	$ 0	$ 0
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLES - Goodwill Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Balance, beginning of the period	$ 553,762,000	$ 518,325,000
Adjustments	0	(942,000)
Goodwill impairment	(553,762,000)	0	$ 0
Balance, end of the period	0	553,762,000	$ 518,325,000
SI Financial Group, Inc.
Goodwill
SI Financial Group, Inc.	$ 0	$ 36,379,000

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLES - Components of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 92,637	$ 100,327
Accumulated Amortization	(57,818)	(54,712)
Net Intangible Assets	34,819	45,615
Discontinued Operations, Held-for-sale | Mid-Atlantic Branch Sale
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible	4,600
Non-maturity deposits (core deposit intangible) (1)
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	77,213	84,903
Accumulated Amortization	(45,257)	(42,663)
Net Intangible Assets	31,956	42,240
Insurance contracts
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	7,558	7,558
Accumulated Amortization	(7,558)	(7,553)
Net Intangible Assets	0	5
All other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	7,866	7,866
Accumulated Amortization	(5,003)	(4,496)
Net Intangible Assets	$ 2,863	$ 3,370

OTHER ASSETS - Summary (Details

OTHER ASSETS - Summary (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Capitalized servicing rights	$ 16,348,000	$ 26,451,000	$ 23,376,000
Accrued interest receivable	46,919,000	36,462,000
Accrued federal and state tax receivable	40,751,000	23,786,000
Operating lease, asset	60,018,000	76,332,000
Deferred tax asset	46,370,000	51,165,000
Derivative assets	160,071,000	80,190,000
Other	16,753,000	18,381,000
Total other assets	387,230,000	312,767,000
Discontinued Operations
Servicing Asset at Amortized Cost [Line Items]
Operating lease, asset	0	3,500,000
Total other assets	0	23,822,000
Continuing Operations
Servicing Asset at Amortized Cost [Line Items]
Total other assets	$ 387,230,000	$ 288,945,000

OTHER ASSETS - Narrative (Detai

OTHER ASSETS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Servicing asset at amortized cost, additions	$ 3,875	$ 16,837
Servicing asset at amortized cost, change in fair value	9,266	5,822
Servicing asset at amortized cost, allowance adjustment	(951)	(4,700)
Continuing Operations
Servicing Asset at Amortized Cost [Line Items]
Mortgage loans sold and serviced for others	1,500,000	1,700,000	$ 1,400,000
Servicing fees	5,500	5,600	4,600
Discontinued Operations
Servicing Asset at Amortized Cost [Line Items]
Mortgage loans sold and serviced for others	600,000	1,400,000	800,000
Servicing fees	$ 2,100	$ 1,900	$ 1,000

OTHER ASSETS - Mortgage Servici

OTHER ASSETS - Mortgage Servicing Rights Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Mortgage servicing rights activity
Balance at beginning of year	$ 26,451	$ 23,376
Additions	3,875	16,837
Amortization	(3,761)	(3,240)
Change in fair value	(9,266)	(5,822)
Allowance adjustment	(951)	(4,700)
Balance at end of year	16,348	26,451
Servicing asset at fair value	$ 3,000	$ 12,300

DEPOSITS (Details)

DEPOSITS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Maturity date:
Within 1 year	$ 1,582,492	$ 2,734,870
Over 1 year to 2 years	545,100	582,622
Over 2 years to 3 years	171,810	145,976
Over 3 years to 4 years	32,358	90,731
Over 4 years to 5 years	51,073	33,754
Over 5 years	2,252	1,416
Total	2,385,085	3,589,369
Less than $100,000	663,324	905,190
$100,000 through $250,000	1,219,210	2,027,717
$250,000 or more	$ 502,551	$ 656,462

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Brokered deposits	$ 600,000	$ 1,200,000
Reciprocal deposits	119,000	91,700
Time deposits	2,385,085	3,589,369
Affiliated Entity
Related Party Transaction [Line Items]
Time deposits	$ 177,200	$ 63,900

BORROWED FUNDS - Summary (Detai

BORROWED FUNDS - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Borrowings and junior subordinated debentures
Short-term borrowings	$ 40,000	$ 125,000
Long-term borrowings	531,637	702,550
Total borrowings	$ 571,637	$ 827,550
Weighted average rate on short-term borrowings (percent)	1.05%	2.06%
Weighted average rate on long-term borrowings (percent)	2.61%	2.72%
Weighted Average Rate	2.50%	2.62%
Advances from the FHLBB
Borrowings and junior subordinated debentures
Short-term borrowings	$ 40,000	$ 125,000
Long-term borrowings	$ 434,357	$ 605,501
Weighted average rate on short-term borrowings (percent)	1.05%	2.06%
Weighted average rate on long-term borrowings (percent)	1.89%	2.16%
Paycheck Protection Program Liquidity Facility ("PPPLF")
Borrowings and junior subordinated debentures
Long-term borrowings	$ 0	$ 0
Weighted average rate on long-term borrowings (percent)	0.00%	0.00%
Subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	$ 74,411	$ 74,232
Weighted average rate on long-term borrowings (percent)	7.00%	7.00%
Junior subordinated borrowing - Trust I
Borrowings and junior subordinated debentures
Long-term borrowings	$ 15,464	$ 15,464
Weighted average rate on long-term borrowings (percent)	2.06%	3.76%
Junior subordinated borrowing - Trust II
Borrowings and junior subordinated debentures
Long-term borrowings	$ 7,405	$ 7,353
Weighted average rate on long-term borrowings (percent)	1.92%	3.59%

BORROWED FUNDS - Narrative (Det

BORROWED FUNDS - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2020	Dec. 31, 2019
Borrowings and junior subordinated debentures
Short-term borrowings		$ 40,000,000	$ 125,000,000
Long-term borrowings		531,637,000	702,550,000
Variable-rate FHLB advances		0	0
Federal Reserve Bank Advances
Borrowings and junior subordinated debentures
Available borrowing capacity		815,600,000	201,300,000
Advances from the FHLBB
Borrowings and junior subordinated debentures
FHLBB advances		0
Line of credit		3,000,000
Outstanding balance, line of credit		0	0
Available borrowing capacity		1,000,000,000	1,600,000,000
Short-term borrowings		40,000,000	125,000,000
Long-term borrowings		434,357,000	605,501,000
Federal Reserve Bank Advances
Borrowings and junior subordinated debentures
Short-term borrowings		0	0
Federal Home Loan Bank Certificates And Obligations F H L B Callable Advances
Borrowings and junior subordinated debentures
Long-term borrowings		10,000,000	10,000,000
Federal Home Loan Bank Certificates And Obligations F H L B Amortizing Advances
Borrowings and junior subordinated debentures
Long-term borrowings		5,200,000	4,400,000
Subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings		74,411,000	74,232,000
Maturity period	15 years
Principal amount of debt issued	$ 75,000,000
Discount rate (percent)	1.15%
Fixed interest rate (percent)	6.875%
Maturity period with fixed interest rate	10 years
Subordinated notes | Three-month LIBOR rate
Borrowings and junior subordinated debentures
Interest rate margin (percent)	5.113%
Unamortized debt issuance costs		215,000	338,000
Junior subordinated borrowing - Trust I
Borrowings and junior subordinated debentures
Long-term borrowings		$ 15,464,000	$ 15,464,000
Junior subordinated borrowing - Trust I | Berkshire Hills Capital Trust I
Borrowings and junior subordinated debentures
Common stock of trust (percent)		100.00%
Common stock of trust included in other asset		$ 500,000
Sole asset of trust in form of debt		$ 15,500,000
Variable interest rate (percent)		2.06%	3.76%
Period up to which interest payments can be deferred		5 years
Junior subordinated borrowing - Trust I | SI Capital Trust II
Borrowings and junior subordinated debentures
Common stock of trust (percent)		100.00%
Common stock of trust included in other asset		$ 200,000
Sole asset of trust in form of debt		$ 8,200,000
Variable interest rate (percent)		1.92%	3.59%
Period up to which interest payments can be deferred		5 years
Junior subordinated borrowing - Trust I | LIBOR | Berkshire Hills Capital Trust I
Borrowings and junior subordinated debentures
Interest rate margin (percent)		1.85%
Junior subordinated borrowing - Trust I | LIBOR | SI Capital Trust II
Borrowings and junior subordinated debentures
Interest rate margin (percent)		1.70%

BORROWED FUNDS - Summary of Mat

BORROWED FUNDS - Summary of Maturities of FHLBB Advances (Details) $ in Thousands	Dec. 31, 2020USD ($)
Amount
Total FHLBB advances	$ 474,357
Weighted Average Rate
Weighted Average Rate
Total FHLBB advances (percent)	1.82%
Fixed Rate Advances
Amount
2021	$ 395,475
2022	58,489
2023	10,916
2024	54
2025 and beyond	$ 9,423
Fixed Rate Advances | Weighted Average Rate
Weighted Average Rate
2021 (percent)	1.80%
2022 (percent)	1.92%
2023 (percent)	2.17%
2024 (percent)	0.00%
2025 and beyond (percent)	1.63%

OTHER LIABILITIES (Details)

OTHER LIABILITIES (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Derivative liabilities	$ 65,758,000	$ 80,681,000
Finance lease liabilities	10,383,000	10,883,000
Asset purchase settlement payable	0	189,000
Employee benefits liability	38,830,000	44,781,000
Operating lease liabilities	63,894,000	80,734,000
Accrued interest payable	3,867,000	11,625,000
Customer transaction clearing accounts	11,261,000	4,310,000
Other	38,737,000	60,676,000
Continuing and Discontinued Operations
Lessee, Lease, Description [Line Items]
Total other liabilities	232,730,000	293,879,000
Discontinued Operations
Lessee, Lease, Description [Line Items]
Operating lease liabilities	0	3,500,000
Total other liabilities	0	26,481,000
Continuing Operations
Lessee, Lease, Description [Line Items]
Total other liabilities	$ 232,730,000	$ 267,398,000

EMPLOYEE BENEFIT PLANS - Narrat

EMPLOYEE BENEFIT PLANS - Narrative (Details)	Aug. 01, 2014USD ($)	Dec. 31, 2020USD ($)employee	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jul. 01, 2020USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense under the plan		$ 3,500,000	$ 4,100,000	$ 3,900,000
Split-dollar agreement, accrued liability		$ 7,900,000	7,100,000
Marketable equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocation		65.00%
Fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocation		34.00%
Cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocation		1.00%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of employees participation (employee) | employee		0
Net actuarial loss		$ 1,300,000	1,200,000
Expected cash contributions by employer		0
Amount expected to be amortized from other comprehensive income into net periodic pension cost over the next fiscal year		103,000
Expense under the plan		377,000
Total planned liabilities					$ 7,900,000
Defined benefit plan, fair value of plan assets		$ 6,049,000	$ 5,799,000	5,522,000	$ 4,500,000
Discount rate (percent)		3.15%	4.16%
Pension Plans | Fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets		$ 1,403,000	$ 1,535,000
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss		869,000	374,000
Amount expected to be amortized from other comprehensive income into net periodic pension cost over the next fiscal year		83,000
Defined benefit plan, fair value of plan assets		$ 0	$ 0	0
Prior service cost of long-term care plan participants	$ 558,000
Discount rate (percent)		2.16%	3.06%
Supplemental Employee Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense under the plan		$ 2,000,000	$ 900,000	$ 600,000
Eligible age for retirement plan		62 years
Accrued expenses		$ 20,100,000	$ 20,300,000
Supplemental Employee Retirement Plan | Chief Executive Officer
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued expenses		$ 900,000

EMPLOYEE BENEFIT PLANS - Summar

EMPLOYEE BENEFIT PLANS - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 5,848	$ 5,669
Service Cost	66	72
Interest cost	178	228
Actuarial loss	519	542
Benefits paid	(337)	(333)
Settlements	(153)	(330)
Projected benefit obligation at end of year	6,121	5,848
Accumulated benefit obligation	6,121	5,848
Change in fair value of plan assets:
Fair value of plan assets at plan beginning of year	5,799	5,522
Actual return on plan assets	740	940
Contributions by employer	0	0
Benefits paid	(337)	(333)
Settlements	(153)	(330)
Fair value of plan assets at end of year	6,049	5,799
Underfunded status	72	49
Postretirement Benefits
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	4,039	3,422
Service Cost	39	38
Interest cost	129	142
Participant contributions	0	0
Actuarial loss	507	565
Benefits paid	(73)	(128)
Projected benefit obligation at end of year	4,641	4,039
Change in fair value of plan assets:
Fair value of plan assets at plan beginning of year	0	0
Contributions by employer	73	128
Contributions by participant	0	0
Benefits paid	(73)	(128)
Fair value of plan assets at end of year	$ 0	$ 0

EMPLOYEE BENEFIT PLANS - Amount

EMPLOYEE BENEFIT PLANS - Amounts Recognized in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jul. 01, 2020	Dec. 31, 2019
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Liabilities		$ 7,900
Pension Plans | Other Liabilities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Liabilities	$ 72		$ 49
Postretirement Benefits | Other Liabilities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Liabilities	$ 4,641		$ 4,039

EMPLOYEE BENEFIT PLANS - Net Pe

EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 66	$ 72
Interest cost	178	228
Expected return on plan assets	(393)	(373)
Amortization of unrecognized actuarial loss	94	117
Net periodic pension costs	(55)	44
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	39	38
Interest cost	129	142
Amortization of net prior service credit	84	83
Amortization of unrecognized actuarial loss	12	0
Net periodic pension costs	$ 264	$ 263

EMPLOYEE BENEFIT PLANS - Change

EMPLOYEE BENEFIT PLANS - Change in Plan Assets and Benefit Obligations Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of actuarial (loss)	$ (94)	$ (117)
Actuarial (gain) loss	171	(25)
Settlement charge	0	(70)
Total recognized in accumulated other comprehensive income	77	(212)
Total recognized in net periodic pension cost recognized and other comprehensive income	22	(168)
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of prior service credit	(84)	(83)
Actuarial (gain) loss	496	374
Total recognized in accumulated other comprehensive income	412	291
Accrued post-retirement liability recognized	$ 4,641	$ 4,039

EMPLOYEE BENEFIT PLANS - Princi

EMPLOYEE BENEFIT PLANS - Principal Actuarial Assumptions (Details) - Pension Plans	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation, discount rate	2.35%	3.15%
Net periodic pension cost, discount rate	3.15%	4.16%
Net periodic pension cost, long term rate of return on plan assets	7.00%	7.00%

EMPLOYEE BENEFIT PLANS - Fair V

EMPLOYEE BENEFIT PLANS - Fair Values of the Plan's Assets by Category and Level (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2020	Jul. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	$ 6,049	$ 4,500	$ 5,799	$ 5,522
Equity Mutual Funds, Large-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,996		1,900
Equity Mutual Funds, Mid-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	519		453
Equity Mutual Funds, Small-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	500		429
Equity Mutual Funds, International
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,049		828
Fixed Income - US Core
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,403		1,535
Intermediate Duration
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	470		517
Cash Equivalents - money market
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	112		137
Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	38		60
Level 1 | Equity Mutual Funds, Large-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Equity Mutual Funds, Mid-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Equity Mutual Funds, Small-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Equity Mutual Funds, International
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Fixed Income - US Core
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Intermediate Duration
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	0		0
Level 1 | Cash Equivalents - money market
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	38		60
Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	6,011		5,739
Level 2 | Equity Mutual Funds, Large-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,996		1,900
Level 2 | Equity Mutual Funds, Mid-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	519		453
Level 2 | Equity Mutual Funds, Small-Cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	500		429
Level 2 | Equity Mutual Funds, International
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,049		828
Level 2 | Fixed Income - US Core
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,403		1,535
Level 2 | Intermediate Duration
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	470		517
Level 2 | Cash Equivalents - money market
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	$ 74		$ 77

EMPLOYEE BENEFIT PLANS - Estima

EMPLOYEE BENEFIT PLANS - Estimated Benefit Payments (Details) $ in Thousands	Dec. 31, 2020USD ($)
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	$ 370
2022	382
2023	367
2024	357
2025 - 2030	1,888
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	123
2022	121
2023	118
2024	117
2025 - 2030	$ 642

EMPLOYEE BENEFIT PLANS - Post-r

EMPLOYEE BENEFIT PLANS - Post-retirement Plan (Details) - Postretirement Benefits - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net prior service cost (credit)	$ 1,325	$ 1,409
Net actuarial loss (gain)	869	374
Total recognized in accumulated other comprehensive income	$ 2,194	$ 1,783

INCOME TAXES - Provision for In

INCOME TAXES - Provision for Income Taxes (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
Current:
Federal tax (benefit)/expense									$ (19,889)	$ 16,576	$ 12,634
State tax (benefit)/expense									(3,976)	5,323	4,114
Total current (benefit) tax expense									(23,865)	21,899	16,748
Deferred:
Federal tax expense									2,048	908	8,443
State tax expense/(benefit)									1,964	(344)	3,770
Total deferred tax expense									4,012	564	12,213
Change in valuation allowance									0	0	0
Net benefit, net operating loss, CARES Act	$ (6,000)								(6,000)
Continuing and Discontinued Operations
Deferred:
Total									(26,866)	20,995	27,648
Discontinued Operations
Deferred:
Total									(7,013)	(1,468)	(1,313)
Continuing Operations
Deferred:
Total	$ (1,659)	$ (68)	$ (16,130)	$ (1,996)	$ 6,421	$ 4,007	$ 5,118	$ 6,917	$ (19,853)	$ 22,463	$ 28,961

INCOME TAXES - Effective Tax Ra

INCOME TAXES - Effective Tax Rate (Details) - Continuing Operations - 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
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory tax rate									$ (111,936)	$ 26,037	$ 29,018
State taxes, net of federal tax benefit									(1,589)	3,641	7,081
Tax exempt income - investments, net									(3,184)	(3,527)	(3,620)
Bank-owned life insurance									(1,283)	(1,305)	(1,337)
Goodwill impairment									103,912	0	0
Non-deductible merger costs									0	122	181
Tax credits, net of basis reduction									(1,812)	(3,531)	(3,574)
Tax rate benefit on net operating loss carryback									(6,040)	0	0
Other, net									2,079	1,026	1,212
Total	$ (1,659)	$ (68)	$ (16,130)	$ (1,996)	$ 6,421	$ 4,007	$ 5,118	$ 6,917	$ (19,853)	$ 22,463	$ 28,961
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory tax rate									21.00%	21.00%	21.00%
State taxes, net of federal tax benefit									0.30%	2.90%	5.10%
Tax exempt income - investments, net									0.60%	(2.80%)	(2.60%)
Bank-owned life insurance									0.30%	(1.10%)	(1.00%)
Goodwill impairment									(19.50%)	0.00%	0.00%
Non-deductible merger costs									0.00%	0.10%	0.10%
Tax credits, net of basis reduction									0.30%	(2.80%)	(2.60%)
Tax rate benefit on net operating loss carryback									0.011	0	0
Other, net									(0.40%)	0.80%	0.90%
Effective tax rate									3.70%	18.10%	20.90%

INCOME TAXES - Deferred Tax Lia

INCOME TAXES - Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for credit losses	$ 35,650	$ 17,446
Unrealized capital loss on tax credit investments	2,360	6,195
Employee benefit plans	7,607	10,565
Purchase accounting adjustments	8,843	39,359
Net operating loss carryforwards	1,753	951
Lease liability	20,119	22,497
Premises and equipment	1,097	739
Nonaccrual interest	1,780	587
Other	1,733	501
Deferred tax assets, net before valuation allowances	80,942	98,840
Valuation allowance	(200)	(200)
Deferred tax assets, net of valuation allowances	80,742	98,640
Deferred tax liabilities:
Net unrealized gain on securities available for sale and pension in OCI	(10,602)	(4,244)
Loan servicing rights	(1,674)	(4,669)
Deferred loan fees	(368)	(1,667)
Intangible amortization	(2,277)	(18,557)
Unamortized tax credit reserve	(1,086)	(1,142)
Right-of-use asset	(18,365)	(20,614)
Deferred tax liabilities	(34,372)	(50,893)
Deferred tax assets, net	46,370	47,747
Discontinued Operations
Deferred tax liabilities:
Deferred tax liabilities	0	(3,418)
Continuing Operations
Deferred tax liabilities:
Deferred tax assets, net	$ 46,370	$ 51,165

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Income Tax Contingency [Line Items]
Decrease in net deferred tax assets	$ 1,400,000
Change in valuation allowance	0
Net operating loss carryforwards	1,000,000
State net operating loss carryforwards	803,000
Federal
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 4,500,000

INCOME TAXES - Valuation Allowa

INCOME TAXES - Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
State tax basis difference, net of Federal tax benefit	$ (200)	$ (200)
Valuation allowances	$ (200)	$ (200)

INCOME TAXES - Unrecognized Tax

INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at January 1	$ 238	$ 467	$ 304
Increase in gross amounts of tax positions related to prior years	309	26	533
Decrease in gross amounts of tax positions related to prior years	0	0	(370)
Decrease due to settlement with taxing authority	0	(185)	0
Decrease due to lapse in statute of limitations	(31)	(70)	0
Unrecognized tax benefits at December 31	$ 516	$ 238	$ 467

DERIVATIVE INSTRUMENTS AND HE_3

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, notional amount	$ 3,857,115	$ 4,070,729
Cash pledged as collateral to derivative counterparties	75,100	96,300
Amortized cost of securities pledged as collateral to derivative counterparties	37,500	25,700
Fair value of securities as pledged collateral to derivative counterparties	37,800	25,800
Interest Rate Swap
Derivative [Line Items]
Cash pledged as collateral to derivative counterparties	75,070	96,310
Interest Rate Swap | Financial institutions counterparties
Derivative [Line Items]
Derivative asset, fair value, amount offset against collateral	1,000	600
Amount of collateral posted for the net liability positions	66,800	78,800
Interest Rate Swap | Commercial counterparties
Derivative [Line Items]
Cash pledged as collateral to derivative counterparties	0	0
Derivative asset, fair value, amount offset against collateral	159,000	76,400
Amount of collateral posted for the net liability positions		1,100
Non-hedging derivatives:
Derivative [Line Items]
Derivative, notional amount	40,099	168,997
Economic Hedging
Derivative [Line Items]
Credit valuation adjustments	$ 1,500
Economic Hedging | Tax advantaged economic development bonds
Derivative [Line Items]
Fixed rate of interest (percent)	5.09%
Maturity period	21 years
Economic Hedging | Interest Rate Swap | Tax advantaged economic development bonds
Derivative [Line Items]
Derivative, notional amount	$ 8,700
Economic Hedging | Hedging derivatives
Derivative [Line Items]
Derivative, notional amount	3,817,016	3,901,732
Economic Hedging | Hedging derivatives | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	3,500,000
Economic Hedging | Hedging derivatives | Interest Rate Swap | Tax advantaged economic development bonds
Derivative [Line Items]
Derivative, notional amount	8,654	9,390
Economic Hedging | Hedging derivatives | Risk Participation Agreements
Derivative [Line Items]
Derivative, notional amount	326,862	315,140
Economic Hedging | Hedging derivatives | Forward Commitments
Derivative [Line Items]
Derivative, notional amount	$ 11,544	$ 237,412

DERIVATIVE INSTRUMENTS AND HE_4

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Notional Amount	$ 3,857,115	$ 4,070,729
Estimated Fair Value Asset (Liability)	94,313	(492)
Economic hedges: | Interest rate swap | Tax advantaged economic development bonds
Offsetting Assets [Line Items]
Notional Amount	8,700
Hedging derivatives | Economic hedges:
Offsetting Assets [Line Items]
Notional Amount	3,817,016	3,901,732
Estimated Fair Value Asset (Liability)	93,578	(3,120)
Hedging derivatives | Economic hedges: | Interest rate swap
Offsetting Assets [Line Items]
Notional Amount	3,500,000
Hedging derivatives | Economic hedges: | Interest rate swap | Tax advantaged economic development bonds
Offsetting Assets [Line Items]
Notional Amount	$ 8,654	$ 9,390
Weighted Average Maturity	8 years 10 months 24 days	9 years 10 months 24 days
Received	0.52%	2.08%
Contract pay rate	5.09%	5.09%
Estimated Fair Value Asset (Liability)	$ (1,778)	$ (1,488)
Hedging derivatives | Economic hedges: | Interest rate swap | Commercial loan
Offsetting Assets [Line Items]
Notional Amount	$ 1,734,978	$ 1,669,895
Weighted Average Maturity	6 years 1 month 6 days	6 years 4 months 24 days
Received	4.15%	4.38%
Contract pay rate	1.95%	3.28%
Estimated Fair Value Asset (Liability)	$ 159,016	$ 75,326
Hedging derivatives | Economic hedges: | Reverse interest rate swaps | Commercial loan
Offsetting Assets [Line Items]
Notional Amount	$ 1,734,978	$ 1,669,895
Weighted Average Maturity	6 years 1 month 6 days	6 years 4 months 24 days
Received	1.95%	3.28%
Contract pay rate	4.15%	4.38%
Estimated Fair Value Asset (Liability)	$ (64,645)	$ (77,051)
Hedging derivatives | Economic hedges: | Risk participation agreements
Offsetting Assets [Line Items]
Notional Amount	$ 326,862	$ 315,140
Weighted Average Maturity	8 years	7 years 6 months
Estimated Fair Value Asset (Liability)	$ 665	$ 320
Hedging derivatives | Economic hedges: | Forward Sale commitments
Offsetting Assets [Line Items]
Notional Amount	$ 11,544	$ 237,412
Weighted Average Maturity	2 months 12 days	2 months 12 days
Estimated Fair Value Asset (Liability)	$ 320	$ (227)
Non-hedging derivatives:
Offsetting Assets [Line Items]
Notional Amount	40,099	168,997
Estimated Fair Value Asset (Liability)	735	2,628
Non-hedging derivatives: | Commitments to lend
Offsetting Assets [Line Items]
Notional Amount	$ 40,099	$ 168,997
Weighted Average Maturity	2 months 12 days	2 months 12 days
Estimated Fair Value Asset (Liability)	$ 735	$ 2,628

DERIVATIVE INSTRUMENTS AND HE_5

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Hedging derivatives | Economic Hedging | Interest Rate Swap | Industrial Revenue Bond
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	$ (289)	$ (248)	$ 409
Hedging derivatives | Economic Hedging | Interest Rate Swap | Commercial loan
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	85,206	65,098	8,758
Hedging derivatives | Economic Hedging | Reverse Interest Rate Swaps | Commercial loan
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	(85,206)	(65,098)	(8,758)
(Unfavorable) change in credit valuation adjustment recognized in other non-interest income	(1,516)	(1,214)	(519)
Hedging derivatives | Economic Hedging | Risk Participation Agreements
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	345	83	263
Hedging derivatives | Economic Hedging | Forward Commitments
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	547	507	(611)
Realized (loss) in discontinued operations	(8,205)	(9,195)	(1,532)
Non-hedging derivatives: | Commitments to lend
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	(1,893)	(1,299)	3,358
Realized (loss) in discontinued operations	$ 15,672	$ 57,699	$ 33,982

DERIVATIVE INSTRUMENTS AND HE_6

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Statements of Condition	$ 160,071	$ 80,190
Interest Rate Swap
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	160,140	77,068
Gross Amounts Offset in the Statements of Condition	(78)	(76)
Net Amounts of Assets Presented in the Statements of Condition	160,062	76,992
Gross amounts not offset in the Statement of Condition, financial instruments	0	0
Gross amounts not offset in the Statement of Condition, cash collateral received	0	0
Net Amount	160,062	76,992
Interest Rate Swap | Institutional counterparties
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	1,124	640
Gross Amounts Offset in the Statements of Condition	(78)	(54)
Net Amounts of Assets Presented in the Statements of Condition	1,046	586
Gross amounts not offset in the Statement of Condition, financial instruments	0	0
Gross amounts not offset in the Statement of Condition, cash collateral received	0	0
Net Amount	1,046	586
Interest Rate Swap | Commercial counterparties
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	159,016	76,428
Gross Amounts Offset in the Statements of Condition	0	(22)
Net Amounts of Assets Presented in the Statements of Condition	159,016	76,406
Gross amounts not offset in the Statement of Condition, financial instruments	0	0
Gross amounts not offset in the Statement of Condition, cash collateral received	0	0
Net Amount	$ 159,016	$ 76,406

DERIVATIVE INSTRUMENTS AND HE_7

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Liabilities and Derivative Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Statement of Condition	$ (65,758)	$ (80,681)
Gross amounts not offset in the Statements of Condition, cash collateral received	75,100	96,300
Interest Rate Swap
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	(164,543)	(81,104)
Gross Amounts Offset in the Statements of Condition	97,740	1,219
Net Amounts of Liabilities Presented in the Statement of Condition	(66,803)	(79,885)
Gross amounts not offset in the Statements of Condition, financial instruments	37,815	25,828
Gross amounts not offset in the Statements of Condition, cash collateral received	75,070	96,310
Net Amount	46,082	42,253
Interest Rate Swap | Institutional counterparties
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	(164,543)	(80,024)
Gross Amounts Offset in the Statements of Condition	97,740	1,219
Net Amounts of Liabilities Presented in the Statement of Condition	(66,803)	(78,805)
Gross amounts not offset in the Statements of Condition, financial instruments	37,815	25,828
Gross amounts not offset in the Statements of Condition, cash collateral received	75,070	96,310
Net Amount	46,082	43,333
Interest Rate Swap | Commercial counterparties
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0	(1,080)
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Condition	0	(1,080)
Gross amounts not offset in the Statements of Condition, financial instruments	0	0
Gross amounts not offset in the Statements of Condition, cash collateral received	0	0
Net Amount	$ 0	$ (1,080)

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 13.5	$ 14.4
Discontinued Operations
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 1.2	$ 2.8
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	19 years

LEASES - Assets and Liabilities

LEASES - Assets and Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Assets, Lessee [Abstract]
Operating lease right-of-use assets	$ 60,018,000	$ 76,332,000
Finance lease right-of-use assets	7,197,000	7,720,000
Total Lease Right-of-Use Assets	67,215,000	84,052,000
Liabilities, Lessee [Abstract]
Operating lease liabilities	63,894,000	80,734,000
Finance lease liabilities	10,383,000	10,883,000
Total Lease Liabilities	$ 74,277,000	$ 91,617,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet	us-gaap:PropertyPlantAndEquipmentNet
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Finance Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Discontinued Operations
Assets, Lessee [Abstract]
Operating lease right-of-use assets	$ 0	$ 3,500,000
Liabilities, Lessee [Abstract]
Operating lease liabilities	$ 0	$ 3,500,000

LEASES- Supplemental Informatio

LEASES- Supplemental Information (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases	9 years 9 months 18 days	10 years 3 months 18 days
Finance leases	13 years 9 months 18 days	14 years 9 months 18 days
Operating leases	2.81%	3.36%
Finance leases	5.00%	5.00%

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flow, Operating And Financing Activities, Lessee [Abstract]
Operating cash flows from operating leases	$ 13,750	$ 14,731
Operating cash flows from finance leases	530	553
Financing cash flows from finance leases	500	435
Right-of-use assets obtained in exchange for lease obligations - operating leases	7,083	88,079
Right-of-use assets obtained in exchange for lease obligations - finance leases	0	0
Discontinued Operations
Cash Flow, Operating And Financing Activities, Lessee [Abstract]
Operating cash flows from operating leases	$ 1,200	$ 2,800

LEASES - Maturity Analysis of L

LEASES - Maturity Analysis of Lease Liability (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 10,875,000
2021	9,990,000
2022	8,752,000
2023	7,508,000
2024	5,668,000
Thereafter	31,215,000
Total undiscounted lease payments	74,008,000
Less amounts representing interest	(10,114,000)
Lease liability	63,894,000	$ 80,734,000
Finance Lease, Liability, Payment, Due [Abstract]
2020	1,023,000
2021	1,031,000
2022	1,037,000
2023	1,037,000
2024	1,037,000
Thereafter	9,223,000
Total undiscounted lease payments	14,388,000
Less amounts representing interest	(4,005,000)
Lease liability	10,383,000	10,883,000
Discontinued Operations
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lease liability	$ 0	$ 3,500,000

OTHER COMMITMENTS, CONTINGENC_3

OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Narrative (Details) $ in Thousands	10 Months Ended
	Dec. 31, 2020USD ($)Loan	Dec. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of modified loans | Loan	5,701
Loan modifications, amount	$ 1,500,000
Active modified loans outstanding | Loan	746
Active modified loans outstanding, carrying value	$ 316,100
Litigation accrual	$ 110	$ 2,000

OTHER COMMITMENTS, CONTINGENC_4

OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Summary of Financial Instruments Outstanding Whose Contract Amounts Represent Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial commitments whose contractual amount represents credit risk
Total	$ 1,778,480	$ 1,835,422
Commitments to originate new loans
Financial commitments whose contractual amount represents credit risk
Total	211,485	143,812
Unused funds on commercial and other lines of credit
Financial commitments whose contractual amount represents credit risk
Total	944,678	850,761
Unadvanced funds on home equity lines of credit
Financial commitments whose contractual amount represents credit risk
Total	371,080	384,723
Unadvanced funds on construction and real estate loans
Financial commitments whose contractual amount represents credit risk
Total	226,736	440,599
Standby letters of credit
Financial commitments whose contractual amount represents credit risk
Total	$ 24,501	15,527
Discontinued Operations | Commitments to originate new loans
Financial commitments whose contractual amount represents credit risk
Total		$ 132,700

SHAREHOLDERS' EQUITY AND EARN_3

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Actual and Required Capital Amounts (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Capital [Abstract]
Total capital to risk-weighted assets, actual amount	$ 1,337,008	$ 1,321,910
Total capital to risk-weighted assets, actual percent	0.1610	0.1373
Total capital to risk-weighted assets, minimum capital requirement, amount	$ 664,239	$ 770,294
Total capital to risk-weighted assets, minimum capital requirement, percent	0.0800	0.0800
Common Equity Tier One Capital [Abstract]
Common Entity Tier 1 Capital to risk-weighted assets, amount	$ 1,145,329	$ 1,161,800
Common Entity Tier 1 Capital to risk-weighted assets, percent	13.79%	12.07%
Common Equity Tier 1 Capital to risk weighted assets, minimum capital requirement, amount	$ 373,634	$ 433,290
Common Equity Tier 1 Capital to risk weighted assets, minimum capital requirement, percent	4.50%	4.50%
Tier One Risk Based Capital [Abstract]
Tier 1 capital risk-weighted assets, amount	$ 1,167,512	$ 1,183,932
Tier 1 capital risk-weighted assets, percent	0.1406	0.1230
Tier 1 capital risk-weighted assets, minimum capital requirement, amount	$ 498,179	$ 577,720
Tier 1 capital risk-weighted assets, minimum capital requirement, percent	0.0600	0.0600
Tier One Leverage Capital [Abstract]
Tier 1 capital to average assets, amount	$ 1,167,512	$ 1,183,932
Tier 1 capital to average assets, percent	0.0938	0.0933
Tier 1 capital to average assets, minimum capital requirement, amount	$ 332,119	$ 385,147
Tier 1 capital to average assets, minimum capital requirement, percent	0.0400	0.0400
Subsidiaries
Capital [Abstract]
Total capital to risk-weighted assets, actual amount	$ 1,243,287	$ 1,233,278
Total capital to risk-weighted assets, actual percent	0.1499	0.1282
Total capital to risk-weighted assets, minimum capital requirement, amount	$ 663,429	$ 769,327
Total capital to risk-weighted assets, minimum capital requirement, percent	0.0800	0.0800
Total capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, amount	$ 961,659	$ 961,659
Total capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, percent	0.1000	0.1000
Common Equity Tier One Capital [Abstract]
Common Entity Tier 1 Capital to risk-weighted assets, amount	$ 1,148,205	$ 1,169,535
Common Entity Tier 1 Capital to risk-weighted assets, percent	13.85%	12.16%
Common Equity Tier 1 Capital to risk weighted assets, minimum capital requirement, amount	$ 373,179	$ 432,747
Common Equity Tier 1 Capital to risk weighted assets, minimum capital requirement, percent	4.50%	4.50%
Common Entity Tier 1 Capital to risk-weighted assets, amount	$ 625,079	$ 625,079
Common Entity Tier 1 Capital to risk-weighted assets, percent	6.50%	6.50%
Tier One Risk Based Capital [Abstract]
Tier 1 capital risk-weighted assets, amount	$ 1,148,205	$ 1,169,535
Tier 1 capital risk-weighted assets, percent	0.1385	0.1216
Tier 1 capital risk-weighted assets, minimum capital requirement, amount	$ 497,572	$ 576,996
Tier 1 capital risk-weighted assets, minimum capital requirement, percent	0.0600	0.0600
Tier 1 capital risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, amount	$ 769,327	$ 769,327
Tier 1 capital risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, percent	0.0800	0.0800
Tier One Leverage Capital [Abstract]
Tier 1 capital to average assets, amount	$ 1,148,205	$ 1,169,535
Tier 1 capital to average assets, percent	0.0923	0.0914
Tier 1 capital to average assets, minimum capital requirement, amount	$ 331,715	$ 384,664
Tier 1 capital to average assets, minimum capital requirement, percent	0.0400	0.0400
Tier 1 capital to average assets, minimum to be well capitalized under prompt corrective action provisions, amount	$ 480,830	$ 480,830
Tier 1 capital to average assets, minimum to be well capitalized under prompt corrective action provisions, percent	0.0500	0.0500

SHAREHOLDERS' EQUITY AND EARN_4

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Preferred Stock (Details) - Series B Convertible Preferred Stock - shares	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Shares issued upon conversion (shares)	2
Preferred stock issued (shares)	0	521,607
Preferred stock, shares outstanding (shares)	0	521,607

SHAREHOLDERS' EQUITY AND EARN_5

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total shareholders’ equity	$ 1,187,773	$ 1,758,564	$ 1,552,918	$ 1,496,264
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total shareholders’ equity	30,871	11,993	(13,470)	4,161
Net unrealized holding gain/(loss) on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive income/(loss), before tax:	44,988	19,262
Income taxes related to items of accumulated other comprehensive (loss)/income:	(11,530)	(5,059)
Total shareholders’ equity	33,459	14,204	(11,453)	6,008
Net unrealized holding (loss) on pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive income/(loss), before tax:	(3,511)	(3,022)
Income taxes related to items of accumulated other comprehensive (loss)/income:	924	812
Total shareholders’ equity	$ (2,588)	$ (2,211)	$ (2,017)	$ (1,847)

SHAREHOLDERS' EQUITY AND EARN_6

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gains (losses) arising during the period
Net of Tax	$ 18,874	$ 25,507	$ (12,417)
Less: reclassification adjustment for gains realized in net income
Net of Tax	(4)	44	(143)
Other comprehensive income (loss)
Total other comprehensive income/(loss), before tax	25,237	34,260	(16,587)
Total income tax (expense) benefit related to other comprehensive income (loss)	(6,359)	(8,797)	4,313
Total other comprehensive income/(loss)	18,878	25,463	(12,274)
Total change to accumulated other comprehensive (loss)
Before Tax		34,260	(24,966)
Tax Effect		(8,797)	7,335
Net of Tax		25,463	(17,631)
Cumulative Effect, Period of Adoption, Adjustment
Less: reclassification related to adoption of ASU
Net of Tax			5,357
Net unrealized holding gain (loss) on AFS securities
Gains (losses) arising during the period
Before Tax	25,721	34,591	(16,917)
Tax Effect	(6,470)	(8,890)	4,419
Net of Tax	19,251	25,701	(12,498)
Less: reclassification adjustment for gains realized in net income
Before Tax	(5)	61	6
Tax Effect	1	(17)	(2)
Net of Tax	(4)	44	4
Other comprehensive income (loss)
Total other comprehensive income/(loss), before tax	25,726	34,530	(16,923)
Total income tax (expense) benefit related to other comprehensive income (loss)	(6,471)	(8,873)	4,421
Total other comprehensive income/(loss)	19,255	25,657	(12,502)
Net unrealized holding gain (loss) on AFS securities | Cumulative Effect, Period of Adoption, Adjustment
Less: reclassification related to adoption of ASU
Net of Tax			4,959
Net unrealized holding (loss) on pension plans
Gains (losses) arising during the period
Before Tax	(489)	(270)
Tax Effect	112	76
Net of Tax	(377)	(194)	81
Less: reclassification adjustment for gains realized in net income
Before Tax	0	0
Tax Effect	0	0
Net of Tax	0	0	(147)
Other comprehensive income (loss)
Total other comprehensive income/(loss), before tax	(489)	(270)
Total income tax (expense) benefit related to other comprehensive income (loss)	112	76
Total other comprehensive income/(loss)	$ (377)	(194)	228
Net unrealized holding (loss) on pension plans | Cumulative Effect, Period of Adoption, Adjustment
Less: reclassification related to adoption of ASU
Net of Tax			398
Net (loss) on effective cash flow hedging derivatives
Gains (losses) arising during the period
Before Tax			135
Tax Effect			(54)
Net of Tax			81
Less: reclassification adjustment for gains realized in net income
Before Tax			(201)
Tax Effect			54
Net of Tax			(147)
Other comprehensive income (loss)
Total other comprehensive income/(loss), before tax			336
Total income tax (expense) benefit related to other comprehensive income (loss)			(108)
Total other comprehensive income/(loss)			228
Accounting Standards Update 2016-01 | Cumulative Effect, Period of Adoption, Adjustment
Less: reclassification related to adoption of ASU
Before Tax		0	8,379
Tax Effect		0	(2,126)
Net of Tax		0	6,253
Accounting Standards Update 2018-02 | Cumulative Effect, Period of Adoption, Adjustment
Less: reclassification related to adoption of ASU
Before Tax		0	0
Tax Effect		0	(896)
Net of Tax		$ 0	$ (896)

SHAREHOLDERS' EQUITY AND EARN_7

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,758,564	$ 1,552,918	$ 1,496,264
Other comprehensive gain/(loss) before reclassifications	18,874	25,507	(12,417)
Amounts reclassified from accumulated other comprehensive income	(4)	44	(143)
Total other comprehensive income/(loss)	18,878	25,463	(12,274)
Ending balance	1,187,773	1,758,564	1,552,918
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(24,380)
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02			5,357
Ending balance		(24,380)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	11,993	(13,470)	4,161
Total other comprehensive income/(loss)	18,878	25,463	(12,274)
Ending balance	30,871	11,993	(13,470)
Net unrealized holding gain/(loss) on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	14,204	(11,453)	6,008
Other comprehensive gain/(loss) before reclassifications	19,251	25,701	(12,498)
Amounts reclassified from accumulated other comprehensive income	(4)	44	4
Total other comprehensive income/(loss)	19,255	25,657	(12,502)
Ending balance	33,459	14,204	(11,453)
Net unrealized holding gain/(loss) on AFS securities | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02			4,959
Net unrealized holding (loss) on pension plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,211)	(2,017)	(1,847)
Other comprehensive gain/(loss) before reclassifications	(377)	(194)	81
Amounts reclassified from accumulated other comprehensive income	0	0	(147)
Total other comprehensive income/(loss)	(377)	(194)	228
Ending balance	$ (2,588)	$ (2,211)	(2,017)
Net unrealized holding (loss) on pension plans | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02			$ 398

SHAREHOLDERS' EQUITY AND EARN_8

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest income	$ 23,327	$ 19,963	$ 17,381	$ 5,636	$ 23,362	$ 21,406	$ 17,512	$ 21,722	$ 66,307	$ 84,002	$ 74,324
Non-interest expense	$ 75,709	$ 77,055	$ 77,590	$ 86,428	$ 91,333	$ 96,871	$ 91,595	$ 85,459	316,782	365,258	356,200
(Loss)/income available to common shareholders									(533,330)	96,490	104,847
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss)/income available to common shareholders									(4)	44	(143)
Realized gains/(losses) on AFS securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest income									(5)	61	6
Tax expense (benefit)									1	(17)	(2)
(Loss)/income available to common shareholders									(4)	44	4
Realized (losses) on pension plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest expense									0	0	(201)
Tax expense (benefit)									0	0	54
(Loss)/income available to common shareholders									$ 0	$ 0	$ (147)

SHAREHOLDERS' EQUITY AND EARN_9

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - (Loss)/ earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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 Basic and Diluted [Line Items]
Net (loss)/income from continuing operations	$ 18,899	$ 23,043	$ (543,045)	$ (12,072)	$ 32,636	$ 20,659	$ 23,954	$ 24,272	$ (513,175)	$ 101,521	$ 109,219
Net (loss) from discontinued operations	(3,890)	(1,818)	(6,336)	(7,798)	(6,885)	1,957	1,494	(637)	(19,842)	(4,071)	(3,454)
Net (loss)/income	$ 15,009	$ 21,225	$ (549,381)	$ (19,870)	$ 25,751	$ 22,616	$ 25,448	$ 23,635	$ (533,017)	$ 97,450	$ 105,765
Average number of common shares issued (in shares)									51,903	49,782	46,212
Less: average number of treasury shares (in shares)									1,569	1,142	810
Less: average number of unvested stock award shares (in shares)									505	420	421
Plus: average participating preferred shares (in shares)									441	1,043	1,043
Average number of basic common shares outstanding (in shares)	50,308	50,329	50,246	50,204	50,494	51,422	48,961	46,113	50,270	49,263	46,024
Average number of diluted common shares outstanding (in shares)	50,355	50,329	50,246	50,204	50,702	51,545	49,114	46,261	50,270	49,421	46,231
Basic (loss)/earnings per share:
Continuing operations (in USD per share)	$ 0.38	$ 0.46	$ (10.80)	$ (0.24)	$ 0.65	$ 0.40	$ 0.49	$ 0.52	$ (10.21)	$ 2.06	$ 2.38
Discontinued operations (in USD per share)	(0.08)	(0.04)	(0.13)	(0.16)	(0.14)	0.04	0.03	(0.01)	(0.39)	(0.08)	(0.08)
Basic (loss)/earnings per share (in USD per share)	0.30	0.42	(10.93)	(0.40)	0.51	0.44	0.52	0.51	(10.60)	1.98	2.30
Diluted (loss)/earnings per share:
Continuing operations (in USD per share)	0.38	0.46	(10.80)	(0.24)	0.65	0.40	0.49	0.52	(10.21)	2.05	2.36
Discontinued operations (in USD per share)	(0.08)	(0.04)	(0.13)	(0.16)	(0.14)	0.04	0.03	(0.01)	(0.39)	(0.08)	(0.07)
Diluted (loss)/earnings per share (in USD per share)	$ 0.30	$ 0.42	$ (10.93)	$ (0.40)	$ 0.51	$ 0.44	$ 0.52	$ 0.51	$ (10.60)	$ 1.97	$ 2.29
Unvested stock awards
Earnings Per Share Basic and Diluted [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)									0	122	180
Employee Stock Option
Earnings Per Share Basic and Diluted [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)									0	36	27

SHAREHOLDERS' EQUITY AND EAR_10

SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Narrative (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	61	38

STOCK-BASED COMPENSATION PLAN_2

STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	$ 4,700,000	$ 4,800,000	$ 4,800,000
Total recognized tax benefit	$ 1,200,000	$ 1,300,000	$ 1,300,000
Weighted average fair value of stock awards granted (in USD per share)	$ 16.69	$ 29.47	$ 37.87
Vesting period	5 years
Total fair value of awards vested	$ 5,200,000	$ 4,800,000	$ 4,800,000
Unrecognized stock-based compensation expense	$ 6,200,000
Expected weighted-average period for recognition of unrecognized compensation	2 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	$ 96,000	93,000	0
Total recognized tax benefit	$ 25,000	25,000	0
Vesting period	5 years
Unrecognized stock-based compensation expense	$ 27,000	124,000	0
Contractual life	10 years
Weighted average remaining contractual term for options outstanding	3 years
Total intrinsic value	$ 246,000	$ 149,000	$ 855,000
2018 Equity Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)	1,000,000
Number of shares available for grant under the plan (in shares)	900,000
2018 Equity Compensation Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares counted against the share limit for each stock granted (percent)	300.00%
2018 Equity Compensation Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares counted against the share limit for each stock granted (percent)	100.00%

STOCK-BASED COMPENSATION PLAN_3

STOCK-BASED COMPENSATION PLANS (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Non-vested Stock Awards Outstanding, Number of Shares
Balance at the beginning of the period (in shares)	450,000
Granted (in shares)	314,000
Stock awards vested (in shares)	(156,000)
Forfeited (in shares)	(91,000)
Balance at the end of the period (in shares)	517,000	450,000
Non-vested Stock Awards Outstanding, Weighted-Average Grant Date Fair Value
Balance at the beginning of the period (in USD per share)	$ 32.47
Granted (in USD per share)	16.69	$ 29.47	$ 37.87
Stock awards vested (in USD per share)	33.18
Forfeited (in USD per share)	29.86
Balance at the end of the period (in USD per share)	$ 28.35	$ 32.47
Employee Stock Option
Stock Options Outstanding, Number of Shares
Balance at the beginning of the period (in shares)	153,000
Granted (in shares)	0
Acquired (in shares)	0
Exercised (in shares)	(37,000)
Forfeited (in shares)	0
Expired (in shares)	(4,000)
Balance at the end of the period (in shares)	112,000	153,000
Stock Options Outstanding, Weighted-Average Exercise Price
Balance at the beginning of the period (in USD per share)	$ 22
Granted (in USD per share)	0
Acquired (in USD per share)	0
Exercised (in USD per share)	17.85
Forfeited (in USD per share)	0
Expired (in USD per share)	11.99
Balance at the end of the period (in USD per share)	$ 22.95	$ 22

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	$ 9,700	$ 10,800
Securities available for sale	1,695,232	1,311,555
Marketable equity securities	18,513	41,556
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	9,708	10,769
Securities available for sale	1,695,232	1,311,555
Marketable equity securities	18,513	41,556
Loans held for investment	8,243,437	9,653,550
Loans held for sale	17,748	169,319
Derivative assets	160,071	80,190
Derivative liabilities	65,758	80,681
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	0	0
Securities available for sale	0	0
Marketable equity securities	17,841	40,500
Loans held for investment	0	0
Loans held for sale	0	0
Derivative assets	0	0
Derivative liabilities	0	227
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	0	0
Securities available for sale	1,680,232	1,267,573
Marketable equity securities	672	1,056
Loans held for investment	0	0
Loans held for sale	12,992	140,280
Derivative assets	159,016	77,562
Derivative liabilities	65,758	80,454
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	9,708	10,769
Securities available for sale	15,000	43,982
Marketable equity securities	0	0
Loans held for investment	8,243,437	9,653,550
Loans held for sale	4,756	29,039
Derivative assets	1,055	2,628
Derivative liabilities	0	0
Recurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	9,708	10,769
Marketable equity securities	18,513	41,556
Loans held for sale	17,748	140,280
Derivative assets	160,071	80,190
Capitalized Servicing Rights	3,033	12,299
Derivative liabilities	65,758	80,681
Recurring | Fair Value | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	2,265
Recurring | Fair Value | Municipal bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	97,803	110,138
Recurring | Fair Value | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	756,826	748,812
Recurring | Fair Value | Agency residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	438,132	147,744
Recurring | Fair Value | Agency commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	288,650	147,096
Recurring | Fair Value | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	60,030	116,576
Recurring | Fair Value | Other bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	53,791	41,189
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	0	0
Marketable equity securities	17,841	40,499
Loans held for sale	0	0
Derivative assets	0	0
Capitalized Servicing Rights	0	0
Derivative liabilities	0	227
Recurring | Level 1 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	0
Recurring | Level 1 | Municipal bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 1 | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 1 | Agency residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 1 | Agency commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 1 | Other bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	0	0
Marketable equity securities	672	1,057
Loans held for sale	12,992	140,280
Derivative assets	159,016	77,562
Capitalized Servicing Rights	0	0
Derivative liabilities	65,758	80,454
Recurring | Level 2 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	0
Recurring | Level 2 | Municipal bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	97,803	110,138
Recurring | Level 2 | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	756,826	748,812
Recurring | Level 2 | Agency residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	438,132	147,744
Recurring | Level 2 | Agency commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	288,650	147,096
Recurring | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	45,030	73,610
Recurring | Level 2 | Other bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	53,791	41,189
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading security	9,708	10,769
Securities available for sale		42,966
Marketable equity securities	0	0
Loans held for sale	4,756	0
Derivative assets	1,055	2,628
Capitalized Servicing Rights	3,033	12,299
Derivative liabilities	0	0
Recurring | Level 3 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	2,265
Recurring | Level 3 | Municipal bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 3 | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 3 | Agency residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 3 | Agency commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Recurring | Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	15,000	42,966
Recurring | Level 3 | Other bonds and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Narra

FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)securitytransfer	Dec. 31, 2019USD ($)transfer	Jan. 01, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of transfers from Level 2 to Level 3 | transfer	4	0
Transfers to Level 3	$ 44,000
Retained earnings (accumulated deficit)	$ 233,344	$ (361,082)
Cumulative Effect, Period of Adoption, Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained earnings (accumulated deficit)		24,380
Loans Held for Investment | Cumulative Effect, Period of Adoption, Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained earnings (accumulated deficit)			$ 11,200
Trading Security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of securities in the portfolio (security) | security	1
Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments for origination of mortgage loans held-for-sale	$ 150,000	67,000
Proceeds from sale and collection of loans held-for-sale	141,000	62,000
Continuing Operations | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains (losses) in fair value of loans held for sale included in earnings	212	97
Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments for origination of mortgage loans held-for-sale	624,000,000	2,900,000
Proceeds from sale and collection of loans held-for-sale	755,000,000	2,800,000
Discontinued Operations | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains (losses) in fair value of loans held for sale included in earnings	$ (3,000)	$ (138)

FAIR VALUE MEASUREMENTS - Loans

FAIR VALUE MEASUREMENTS - Loans Held for Investment (Details) - Level 2 $ in Thousands	Dec. 31, 2020USD ($)
Loans Held for Sale
Aggregate Unpaid Principal	$ 16,705
Recurring | Loans Held for Investment | Continuing Operations
Loans Held for Sale
Loans held for investment	2,265
Aggregate Unpaid Principal	53,945
Aggregate Fair Value Less Aggregate Unpaid Principal	$ (51,680)

FAIR VALUE MEASUREMENTS - Loa_2

FAIR VALUE MEASUREMENTS - Loans Held for Sale (Details) - Level 2 - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans Held for Sale
Aggregate Fair Value	$ 12,992	$ 140,280
Aggregate Unpaid Principal	16,705
Recurring
Loans Held for Sale
Aggregate Fair Value	12,992	140,280
Recurring | Loans held for sale
Loans Held for Sale
Aggregate Fair Value	12,992	140,280
Aggregate Unpaid Principal	12,639	137,107
Aggregate Fair Value Less Aggregate Unpaid Principal	353	3,173
Continuing Operations | Recurring | Loans held for sale
Loans Held for Sale
Aggregate Fair Value	12,992	7,625
Aggregate Unpaid Principal	12,639	7,485
Aggregate Fair Value Less Aggregate Unpaid Principal	353	140
Discontinued Operations | Recurring | Loans held for sale
Loans Held for Sale
Aggregate Fair Value	0	132,655
Aggregate Unpaid Principal	0	129,622
Aggregate Fair Value Less Aggregate Unpaid Principal	$ 0	$ 3,033

FAIR VALUE MEASUREMENTS - Chang

FAIR VALUE MEASUREMENTS - Changes in Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in Level 3 assets that were measured at fair value on a recurring basis
Transfers to Level 3	$ 44,000
Transfers to loans held for sale	(14,845)	$ (120,307)	$ 0
Commitments to lend
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	2,628	3,927
Transfers to loans held for sale	(18,458)	(57,070)
Balance at the end of the period	735	2,628	3,927
Unrealized gains (losses) relating to instruments still held at the end of the period	735	2,628
Forward Contracts
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	0	0
Balance at the end of the period	320	0	0
Unrealized gains (losses) relating to instruments still held at the end of the period	320	0
Trading Security
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	10,769	11,212
Unrealized (loss), net recognized in other non-interest income	(327)	258
Paydown of trading security		(701)
Paydown of asset	734
Balance at the end of the period	9,708	10,769	11,212
Unrealized gains (losses) relating to instruments still held at the end of the period	1,053	1,379
Securities Available for Sale
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	42,966	0
Maturities, calls, and prepayments of AFS Security	(30,000)
Unrealized (loss) included in accumulated other comprehensive loss	2,034	(162)
Transfers to Level 3	0	43,128
Balance at the end of the period	15,000	42,966	0
Unrealized gains (losses) relating to instruments still held at the end of the period	287	(162)
Loans Held for Investment
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	0	0
Unrealized (loss), net recognized in other non-interest income	(1,283)
Paydown of asset	(4,112)
Balance at the end of the period	2,265	0	0
Unrealized gains (losses) relating to instruments still held at the end of the period	0	0
Loans Held for Investment | Cumulative Effect, Period of Adoption, Adjustment
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	7,660
Balance at the end of the period		7,660
Capitalized servicing rights
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	12,299	11,485
Unrealized (loss), net recognized in other non-interest income	(822)
Additions to servicing rights	0	11,136
Balance at the end of the period	3,033	12,299	$ 11,485
Unrealized gains (losses) relating to instruments still held at the end of the period	0	0
Capitalized servicing rights | Cumulative Effect, Period of Adoption, Adjustment
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	0
Balance at the end of the period		0
Discontinued Operations | Commitments to lend
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gain/(loss), net recognized in discontinued operations	16,565	55,771
Discontinued Operations | Forward Contracts
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gain/(loss), net recognized in discontinued operations	320	0
Discontinued Operations | Capitalized servicing rights
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gain/(loss), net recognized in discontinued operations	$ (8,444)	$ (10,322)

FAIR VALUE MEASUREMENTS - Signi

FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Recurring Assets (Details) $ in Thousands	Dec. 31, 2020USD ($)uSDPerLoan	Dec. 31, 2019USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading Security	$ 9,708	$ 10,769
Securities available for sale	1,695,232	1,311,555
Commitments to Lend	160,071	80,190
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale	15,000	43,982
Level 3 | Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading Security	9,708	10,769
Securities available for sale		42,966
Loans held for investment	2,265
Capitalized Servicing Rights	3,033	12,299
Total	$ 31,061	$ 68,662
Level 3 | Recurring | Discounted Cash Flow | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading security, significant unobservable input value	0.0272	0.0221
Loans held for investment, significant unobservable input value	0.3000
Level 3 | Recurring | Securities Available for Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale	$ 15,000
Level 3 | Recurring | Securities Available for Sale | Indication from Market Maker | Measurement Input, Price Indication
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale, significant unobservable input value	1.0200
Level 3 | Recurring | Commitments to lend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to Lend	$ 735	$ 2,628
Level 3 | Recurring | Commitments to lend | Historical Trend | Closing Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to lend, significant unobservable input value	0.7454	0.7781
Level 3 | Recurring | Commitments to lend | Pricing Model | Origination Costs, per loan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to lend, significant unobservable input value	3,000	3,000
Level 3 | Recurring | Forward Commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to Lend	$ 320
Level 3 | Recurring | Forward Commitments | Historical Trend | Closing Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to lend, significant unobservable input value	0.7454
Level 3 | Recurring | Forward Commitments | Pricing Model | Origination Costs, per loan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to lend, significant unobservable input value | uSDPerLoan	3,000
Level 3 | Recurring | Capitalized Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized Servicing Rights	$ 3,033	$ 12,299
Level 3 | Recurring | Capitalized Servicing Rights | Discounted Cash Flow | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights, significant unobservable input value	0.1000	0.1000
Level 3 | Recurring | Capitalized Servicing Rights | Discounted Cash Flow | Constant prepayment rate (CPR)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights, significant unobservable input value	0.2652	0.1150
Minimum | Level 3 | Recurring | Discounted Cash Flow | Collateral Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for investment, significant unobservable input value	8.1
Minimum | Level 3 | Recurring | AFS Securities [Member] | Indication from Market Maker | Measurement Input, Price Indication
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale, significant unobservable input value		0.9700
Maximum | Level 3 | Recurring | Discounted Cash Flow | Collateral Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for investment, significant unobservable input value	21.9
Maximum | Level 3 | Recurring | AFS Securities [Member] | Indication from Market Maker | Measurement Input, Price Indication
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale, significant unobservable input value		1

FAIR VALUE MEASUREMENTS - Non-r

FAIR VALUE MEASUREMENTS - Non-recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	$ 3,000	$ 12,300
Other real estate owned	149	0
Non-recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually evaluated loans	28,028	8,831
Capitalized servicing rights	13,315	14,152
Other real estate owned	149
Total	$ 41,492	$ 22,983

FAIR VALUE MEASUREMENTS - Sig_2

FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Non-recurring Assets (Details) $ in Thousands	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	$ 3,000	$ 12,300
Other real estate owned	149	0
Non-recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually evaluated loans	28,028	8,831
Capitalized servicing rights	13,315	14,152
Other real estate owned	149
Total Assets	41,492	22,983
Non-recurring | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually evaluated loans	$ 28,028	8,831
Non-recurring | Fair value of collateral | Level 3 | Other Real Estate Owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned		$ 149
Non-recurring | Minimum | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0.0007	0.1572
Non-recurring | Minimum | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0	8
Non-recurring | Minimum | Appraised value | Fair value of collateral | Level 3 | Other Real Estate Owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Significant Unobservable Input Value | security	94
Non-recurring | Maximum | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	1	0.0012
Non-recurring | Maximum | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	11,432	1,548
Non-recurring | Maximum | Appraised value | Fair value of collateral | Level 3 | Other Real Estate Owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Significant Unobservable Input Value | security	182
Non-recurring | Weighted Average | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0.4636	0.0450
Non-recurring | Weighted Average | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	9,800	736
Non-recurring | Capitalized servicing rights | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	$ 13,315	$ 14,152
Non-recurring | Capitalized servicing rights | Minimum | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1449	0.0944
Non-recurring | Capitalized servicing rights | Minimum | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1000	0.1000
Non-recurring | Capitalized servicing rights | Maximum | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.2329	0.1412
Non-recurring | Capitalized servicing rights | Maximum | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1100	0.1350
Non-recurring | Capitalized servicing rights | Weighted Average | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1698	0.1225
Non-recurring | Capitalized servicing rights | Weighted Average | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1056	0.1178

FAIR VALUE MEASUREMENTS - Summa

FAIR VALUE MEASUREMENTS - Summary of Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Assets
Trading security	$ 9,700	$ 10,800
Marketable equity securities	18,513	41,556
Securities available for sale	1,695,232	1,311,555
Securities held to maturity	491,855	373,277
FHLB stock and restricted equity securities	34,873	48,019
Accrued interest receivable	46,919	36,462
Level 1
Financial Assets
Cash and cash equivalents	1,557,875	579,829
Trading security	0	0
Marketable equity securities	17,841	40,500
Securities available for sale	0	0
Securities held to maturity	0	0
Net loans	0	0
Loans held for sale	0	0
Accrued interest receivable	0	0
Derivative assets	0	0
Assets from discontinued operations	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term FHLB advances	0	0
Subordinated notes	0	0
Derivative liabilities	0	227
Liabilities from discontinued operations	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading security	0	0
Marketable equity securities	672	1,056
Securities available for sale	1,680,232	1,267,573
Securities held to maturity	488,393	355,513
Net loans	0	0
Loans held for sale	12,992	140,280
Accrued interest receivable	46,919	36,462
Derivative assets	159,016	77,562
Assets from discontinued operations	16,705
Financial Liabilities
Total deposits	10,230,822	10,338,993
Short-term debt	40,025	125,081
Long-term FHLB advances	438,064	606,381
Subordinated notes	95,178	101,055
Derivative liabilities	65,758	80,454
Liabilities from discontinued operations	631,268
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading security	9,708	10,769
Marketable equity securities	0	0
Securities available for sale	15,000	43,982
Securities held to maturity	3,462	17,764
Net loans	8,243,437	9,653,550
Loans held for sale	4,756	29,039
Accrued interest receivable	0	0
Derivative assets	1,055	2,628
Assets from discontinued operations	300,599
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term FHLB advances	0	0
Subordinated notes	0	0
Derivative liabilities	0	0
Liabilities from discontinued operations	0
Carrying Amount
Financial Assets
Cash and cash equivalents	1,557,875	579,829
Trading security	9,708	10,769
Marketable equity securities	18,513	41,556
Securities available for sale	1,695,232	1,311,555
Securities held to maturity	465,091	357,979
FHLB stock and restricted equity securities	34,873	48,019
Net loans	7,954,217	9,438,853
Loans held for sale	17,748	169,319
Accrued interest receivable	46,919	36,462
Derivative assets	160,071	80,190
Assets from discontinued operations	317,304
Financial Liabilities
Total deposits	10,215,808	10,335,977
Short-term debt	40,000	125,000
Long-term FHLB advances	434,357	605,501
Subordinated notes	97,280	97,049
Derivative liabilities	65,758	80,681
Liabilities from discontinued operations	630,065
Fair Value
Financial Assets
Cash and cash equivalents	1,557,875	579,829
Trading security	9,708	10,769
Marketable equity securities	18,513	41,556
Securities available for sale	1,695,232	1,311,555
Securities held to maturity	491,855	373,277
Net loans	8,243,437	9,653,550
Loans held for sale	17,748	169,319
Accrued interest receivable	46,919	36,462
Derivative assets	160,071	80,190
Assets from discontinued operations	317,304
Financial Liabilities
Total deposits	10,230,822	10,338,993
Short-term debt	40,025	125,081
Long-term FHLB advances	438,064	606,381
Subordinated notes	95,178	101,055
Derivative liabilities	65,758	$ 80,681
Liabilities from discontinued operations	$ 631,268

CONDENSED FINANCIAL STATEMENT_3

CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash due from Berkshire Bank	$ 91,219	$ 105,447
Marketable equity securities, at fair value	1,695,232	1,311,555
Other assets	387,230	312,767
Total assets	12,838,013	13,215,970
Liabilities and Shareholders’ Equity
Subordinated notes	97,280	97,049
Shareholders’ equity	1,187,773	1,758,564	$ 1,552,918	$ 1,496,264
Total liabilities and shareholders’ equity	12,838,013	13,215,970
Reportable legal entity | Berkshire Hills Bancorp
Condensed balance sheets
Proceeds from intercompany subordinated note converted to equity	0	0	$ 35,000
Assets
Cash due from Berkshire Bank	83,510	74,153
Investment in subsidiaries	1,202,755	1,777,717
Marketable equity securities, at fair value	158	4,840
Other assets	188	438
Total assets	1,286,611	1,857,148
Liabilities and Shareholders’ Equity
Subordinated notes	97,280	97,049
Accrued expenses	1,558	1,535
Shareholders’ equity	1,187,773	1,758,564
Total liabilities and shareholders’ equity	$ 1,286,611	$ 1,857,148

CONDENSED FINANCIAL STATEMENT_4

CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Condensed Statements of Operations (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
Income:
Total net revenue	$ 99,036	$ 97,018	$ 94,971	$ 92,064	$ 114,695	$ 118,277	$ 109,107	$ 107,181	$ 383,089	$ 449,260	$ 430,524
Interest expense	16,422	20,713	26,098	29,767	34,108	36,854	37,643	35,650	93,000	144,255	109,694
Net (loss)/income	$ 15,009	$ 21,225	$ (549,381)	$ (19,870)	$ 25,751	$ 22,616	$ 25,448	$ 23,635	(533,017)	97,450	105,765
Preferred stock dividend									313	960	918
(Loss)/income available to common shareholders									(533,330)	96,490	104,847
Comprehensive (loss)/income									(514,139)	122,913	93,491
Reportable legal entity | Berkshire Hills Bancorp
Income:
Dividends from subsidiaries									46,300	104,700	48,500
Other									(2,185)	1,258	506
Total net revenue									44,115	105,958	49,006
Interest expense									5,335	5,335	5,335
Non-interest expenses									2,866	4,129	3,034
Total expense									8,201	9,464	8,369
Income before income taxes and equity in undistributed income of subsidiaries									35,914	96,494	40,637
Income tax (benefit)/expense									(2,719)	(2,054)	(1,068)
Income before equity in undistributed income of subsidiaries									38,633	98,548	41,705
Equity in undistributed results of operations of subsidiaries									(571,650)	(1,098)	64,060
Net (loss)/income									(533,017)	97,450	105,765
Preferred stock dividend									313	960	918
(Loss)/income available to common shareholders									(533,330)	96,490	104,847
Comprehensive (loss)/income									$ (514,139)	$ 122,912	$ 88,133

CONDENSED FINANCIAL STATEMENT_5

CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Condensed Statements of Cash Flows (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 statements of cash flows
Net (loss)/income	$ 15,009	$ 21,225	$ (549,381)	$ (19,870)	$ 25,751	$ 22,616	$ 25,448	$ 23,635	$ (533,017)	$ 97,450	$ 105,765
Adjustments to reconcile net income to net cash (used) provided by operating activities:
Other, net									(31,247)	(23,418)	30,601
Net cash provided by operating activities									227,641	111,525	222,254
Cash flows from investing activities:
Other, net									(7,280)	(4,387)	(4,724)
Net cash provided/(used) by investing activities									641,103	1,202,582	(861,517)
Cash flows from financing activities:
Payment to repurchase common stock									(473)	(52,746)	0
Common and preferred stock cash dividends paid									(36,564)	(45,107)	(40,884)
Net cash provided/(used) by financing activities									109,302	(917,467)	573,689
Net change in cash and cash equivalents									978,046	396,640	(65,574)
Cash and cash equivalents at beginning of year				579,829				183,189	579,829	183,189	248,763
Cash and cash equivalents at end of year	1,557,875				579,829				1,557,875	579,829	183,189
Reportable legal entity | Berkshire Hills Bancorp
Condensed statements of cash flows
Net (loss)/income									(533,017)	97,450	105,765
Adjustments to reconcile net income to net cash (used) provided by operating activities:
Equity in undistributed results of operations of subsidiaries									571,650	1,098	(64,060)
Other, net									2,603	(4,457)	20,916
Net cash provided by operating activities									41,236	94,091	62,621
Cash flows from investing activities:
Advances to subsidiaries									0	0	(85,000)
Purchase of securities									(489)	0	(128)
Sale of securities									4,658	6,989	13,550
Other, net									0	987	0
Net cash provided/(used) by investing activities									4,169	7,976	(71,578)
Cash flows from financing activities:
Proceed from issuance of short term debt									231	431	178
Proceed from repayment of long term debt									0	0	35,000
Net proceeds from common stock									0	0	325
Payment to repurchase common stock									(473)	(52,746)	0
Common and preferred stock cash dividends paid									(36,251)	(44,147)	(39,966)
Preferred stock cash dividends paid									(313)	(960)	(918)
Other, net									758	188	278
Net cash provided/(used) by financing activities									(36,048)	(97,234)	(5,103)
Net change in cash and cash equivalents									9,357	4,833	(14,060)
Cash and cash equivalents at beginning of year				$ 74,153				$ 69,320	74,153	69,320	83,380
Cash and cash equivalents at end of year	$ 83,510				$ 74,153				$ 83,510	$ 74,153	$ 69,320

QUARTERLY DATA (UNAUDITED) (Det

QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Interim Period, Costs Not Allocable [Line Items]
Interest and dividend income	$ 92,131	$ 97,768	$ 103,688	$ 116,195	$ 125,441	$ 133,725	$ 129,238	$ 121,109	$ 409,782	$ 509,513	$ 465,894
Interest expense	16,422	20,713	26,098	29,767	34,108	36,854	37,643	35,650	93,000	144,255	109,694
Net interest income	75,709	77,055	77,590	86,428	91,333	96,871	91,595	85,459	316,782	365,258	356,200
Non-interest income	23,327	19,963	17,381	5,636	23,362	21,406	17,512	21,722	66,307	84,002	74,324
Total net revenue	99,036	97,018	94,971	92,064	114,695	118,277	109,107	107,181	383,089	449,260	430,524
Provision for credit losses	10,000	1,200	29,871	34,807	5,351	22,600	3,467	4,001	75,878	35,419	25,451
Non-interest expense	71,796	72,843	624,275	71,325	70,287	71,011	76,568	71,991	840,239	289,857	266,893
(Loss)/income from continuing operations before income taxes	17,240	22,975	(559,175)	(14,068)	39,057	24,666	29,072	31,189	(533,028)	123,984	138,180
Net income/(loss) from continuing operations	18,899	23,043	(543,045)	(12,072)	32,636	20,659	23,954	24,272	(513,175)	101,521	109,219
(Loss)/income from discontinued operations, net of tax	(3,890)	(1,818)	(6,336)	(7,798)	(6,885)	1,957	1,494	(637)	(19,842)	(4,071)	(3,454)
Net (loss)/income	$ 15,009	$ 21,225	$ (549,381)	$ (19,870)	$ 25,751	$ 22,616	$ 25,448	$ 23,635	$ (533,017)	$ 97,450	$ 105,765
Basic earnings/(loss) per share:
Continuing operations (in USD per share)	$ 0.38	$ 0.46	$ (10.80)	$ (0.24)	$ 0.65	$ 0.40	$ 0.49	$ 0.52	$ (10.21)	$ 2.06	$ 2.38
Discontinued operations (in USD per share)	(0.08)	(0.04)	(0.13)	(0.16)	(0.14)	0.04	0.03	(0.01)	(0.39)	(0.08)	(0.08)
Basic (loss)/earnings per share (in USD per share)	0.30	0.42	(10.93)	(0.40)	0.51	0.44	0.52	0.51	(10.60)	1.98	2.30
Diluted earnings/(loss) per share:
Continuing operations (in USD per share)	0.38	0.46	(10.80)	(0.24)	0.65	0.40	0.49	0.52	(10.21)	2.05	2.36
Discontinued operations (in USD per share)	(0.08)	(0.04)	(0.13)	(0.16)	(0.14)	0.04	0.03	(0.01)	(0.39)	(0.08)	(0.07)
Diluted (loss)/earnings per share (in USD per share)	$ 0.30	$ 0.42	$ (10.93)	$ (0.40)	$ 0.51	$ 0.44	$ 0.52	$ 0.51	$ (10.60)	$ 1.97	$ 2.29
Weighted average common shares outstanding:
Basic (in shares)	50,308	50,329	50,246	50,204	50,494	51,422	48,961	46,113	50,270	49,263	46,024
Diluted (in shares)	50,355	50,329	50,246	50,204	50,702	51,545	49,114	46,261	50,270	49,421	46,231
Continuing Operations
Interim Period, Costs Not Allocable [Line Items]
Income tax (benefit)/expense	$ (1,659)	$ (68)	$ (16,130)	$ (1,996)	$ 6,421	$ 4,007	$ 5,118	$ 6,917	$ (19,853)	$ 22,463	$ 28,961

NET INTEREST INCOME AFTER PRO_3

NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES (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
Net Interest Income After Provision For Credit Losses Disclosure [Line Items]
Net interest income	$ 75,709	$ 77,055	$ 77,590	$ 86,428	$ 91,333	$ 96,871	$ 91,595	$ 85,459	$ 316,782	$ 365,258	$ 356,200
Provision for credit losses	10,000	1,200	29,871	34,807	5,351	22,600	3,467	4,001	75,878	35,419	25,451
Net interest income after provision for credit losses									240,904	329,839	330,749
Total non-interest income	23,327	19,963	17,381	5,636	23,362	21,406	17,512	21,722	66,307	84,002	74,324
Total non-interest expense	71,796	72,843	624,275	71,325	70,287	71,011	76,568	71,991	840,239	289,857	266,893
(Loss)/income from continuing operations before income taxes	17,240	22,975	(559,175)	(14,068)	39,057	24,666	29,072	31,189	(533,028)	123,984	138,180
Net (loss)/income from continuing operations									(513,175)	101,521	109,219
(Loss) from discontinued operations before income taxes									(26,855)	(5,539)	(4,767)
Income tax (benefit)									(7,013)	(1,468)	(1,313)
Net (loss) from discontinued operations	(3,890)	(1,818)	(6,336)	(7,798)	(6,885)	1,957	1,494	(637)	(19,842)	(4,071)	(3,454)
Net (loss)/income	15,009	21,225	(549,381)	(19,870)	25,751	22,616	25,448	23,635	(533,017)	97,450	105,765
Continuing Operations
Net Interest Income After Provision For Credit Losses Disclosure [Line Items]
Income tax (benefit)/expense	$ (1,659)	$ (68)	$ (16,130)	$ (1,996)	$ 6,421	$ 4,007	$ 5,118	$ 6,917	$ (19,853)	$ 22,463	$ 28,961

REVENUE (Details)

REVENUE (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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Non-interest income (in-scope of Topic 606)									$ 46,853	$ 49,698	$ 48,653
Non-interest income (out-of-scope of Topic 606)									19,454	34,304	25,671
Total non-interest income	$ 23,327	$ 19,963	$ 17,381	$ 5,636	$ 23,362	$ 21,406	$ 17,512	$ 21,722	66,307	84,002	74,324
Service charges on deposit accounts
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Non-interest income (in-scope of Topic 606)									19,239	23,122	21,046
Insurance commissions and fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Non-interest income (in-scope of Topic 606)									10,770	10,957	10,983
Wealth management fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Non-interest income (in-scope of Topic 606)									9,285	9,353	9,447
Interchange income
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Non-interest income (in-scope of Topic 606)									$ 7,559	$ 6,266	$ 7,177