Dime Community Bancshares (DCOM) 10-K 15 Mar 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 28, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	001-34096
Entity Registrant Name	DIME COMMUNITY BANCSHARES, INC.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-2934195
Entity Address, Address Line One	898 VETERANS MEMORIAL HIGHWAY, SUITE 560
Entity Address, City or Town	HAUPPAUGE
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11788
City Area Code	631-
Local Phone Number	537-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		41,488,275
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000846617
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 377,838,854
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock
Trading Symbol	DCOM
Security Exchange Name	NASDAQ
Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock
Trading Symbol	DCOMP
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 107,729	$ 77,693
Interest-bearing deposits with banks	769,099	39,501
Total cash and cash equivalents	876,828	117,194
Securities available for sale, at fair value	450,360	638,291
Securities held to maturity (fair value of $89,325 and $135,027, respectively)	85,700	133,638
Total securities	536,060	771,929
Securities, restricted	23,362	32,879
Loans held for sale	52,785	12,643
Loans held for investment	4,597,403	3,680,285
Allowance for credit losses	(44,200)	(32,786)
Loans, net	4,553,203	3,647,499
Premises and equipment, net	34,872	34,062
Operating lease right-of-use assets	44,007	43,450
Accrued interest receivable	16,566	10,908
Goodwill	105,950	105,950
Other intangible assets	3,378	3,677
Prepaid pension	10,313	10,988
Bank owned life insurance	93,900	91,942
Other assets	83,072	38,399
Total assets	6,434,296	4,921,520
Liabilities
Demand deposits	2,472,727	1,518,958
Savings, NOW and money market deposits	2,728,081	1,987,712
Certificates of deposit of $100,000 or more	216,017	214,093
Other time deposits	72,428	93,884
Total deposits	5,489,253	3,814,647
Repurchase agreements	1,223	999
Federal Home Loan Bank ("FHLB") advances	215,000	435,000
Subordinated debentures, net	79,059	78,920
Operating lease liabilities	46,713	45,977
Other liabilities and accrued expenses	85,217	48,823
Total liabilities	5,916,465	4,424,366
Commitments and contingencies
Stockholders' equity
Preferred stock, par value $.01 per share (2,000,000 shares authorized; none issued)
Common stock, par value $.01 per share (40,000,000 shares authorized; 19,951,955 and 19,898,022 shares issued, respectively; and 19,743,710 and 19,836,797 shares outstanding, respectively)	199	199
Surplus	360,741	356,436
Retained earnings	172,075	150,703
Treasury stock at cost, 208,245 and 61,225 shares, respectively	(5,056)	(1,843)
Total stockholders' equity before accumulated other comprehensive income (loss)	527,959	505,495
Accumulated other comprehensive loss, net of income taxes	(10,128)	(8,341)
Total stockholders' equity	517,831	497,154
Total liabilities and stockholders' equity	$ 6,434,296	$ 4,921,520

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Consolidated Balance Sheets
Securities held to maturity, fair value (in dollars)	$ 89,325	$ 135,027
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,951,955	19,898,022
Common stock, shares outstanding	19,743,710	19,836,797
Treasury Stock, shares	208,245	61,225

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income:
Loans (including fee income)	$ 169,411	$ 158,228	$ 144,380
Mortgage-backed securities, CMOs and other asset-backed securities	9,329	16,182	16,591
U.S. GSE securities	365	465	837
State and municipal obligations	1,843	2,234	2,812
Corporate bonds	1,070	1,200	1,422
Deposits with banks	673	1,697	1,076
Other interest and dividend income	1,541	1,535	1,866
Total interest income	184,232	181,541	168,984
Interest expense:
Savings, NOW and money market deposits	10,435	23,687	15,928
Certificates of deposit of $100,000 or more	3,346	4,270	3,007
Other time deposits	1,198	1,502	1,801
Federal funds purchased and repurchase agreements	79	767	1,200
FHLB advances	3,992	4,573	5,729
Subordinated debentures	4,401	4,539	4,539
Total interest expense	23,451	39,338	32,204
Net interest income	160,781	142,203	136,780
Provision for credit losses	11,500	5,700	1,800
Net interest income after provision for credit losses	149,281	136,503	134,980
Non-interest income:
Service charges and other fees	8,955	10,059	9,853
Net securities gains (losses)	3,525	201	(7,921)
Loss on termination of swaps	(3,403)
Change in fair value of loans held for sale	(2,877)
Title fees	2,337	1,720	1,797
Gain on sale of Small Business Administration ("SBA") loans	3,940	1,984	2,078
Bank owned life insurance	2,186	2,230	2,219
Loan swap fees	3,742	7,460	716
Other	1,298	1,733	2,826
Total non-interest income	19,703	25,387	11,568
Non-interest expense:
Salaries and employee benefits	67,159	56,244	50,458
Occupancy and equipment	14,287	14,372	13,245
Technology and communications	9,712	7,905	6,465
Marketing and advertising	3,287	4,740	4,597
Professional services	4,988	3,797	4,004
FDIC assessments	1,950	608	1,665
Net fraud loss			8,900
Office relocation costs			750
Restructuring Costs	4,452
Amortization of other intangible assets	656	787	917
Other	6,766	7,686	7,179
Total non-interest expense	113,257	96,139	98,180
Income before income taxes	55,727	65,751	48,368
Income tax expense	13,685	14,060	9,141
Net income	$ 42,042	$ 51,691	$ 39,227
Basic earnings per share (in dollars per share)	$ 2.11	$ 2.59	$ 1.97
Diluted earnings per share (in dollars per share)	$ 2.11	$ 2.59	$ 1.97

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income
Net income	$ 42,042	$ 51,691	$ 39,227
Other comprehensive (loss) income:
Change in unrealized net gains (losses) on securities available for sale, net of reclassifications and deferred income taxes	3,916	10,856	(348)
Adjustment to pension liability, net of reclassifications and deferred income taxes	(1,865)	(410)	(832)
Unrealized (losses) gains on cash flow hedges, net of reclassifications and deferred income taxes	(3,838)	(3,675)	1,007
Total other comprehensive (loss) income	(1,787)	6,771	(173)
Comprehensive income	$ 40,255	$ 58,462	$ 39,054

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	SurplusCumulative Effect, Period of Adoption, Adjusted Balance	Surplus	Retained EarningsEffect of adoption	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Accumulated Other Comprehensive LossCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Effect of adoption	Cumulative Effect, Period of Adoption, Adjusted Balance	Total
Balance at Dec. 31, 2017		$ 197		$ 347,691			$ 96,547		$ (296)		$ (14,939)			$ 429,200
Increase (Decrease) in Stockholders' Equity
Net income							39,227							39,227
Shares issued under the dividend reinvestment plan ("DRP")				954										954
Shares issued under the Employee Stock Purchase Plan ("ESPP")				63										63
Stock awards granted and distributed		1		(539)					538
Stock awards forfeited				437					(437)
Repurchase of surrendered stock from vesting of stock plans									586					586
Share based compensation expense				3,487										3,487
Cash dividend declared							(18,342)							(18,342)
Other comprehensive (loss) income, net of deferred income taxes											(173)			(173)
Balance at Dec. 31, 2018		198		352,093			117,432		(781)		(15,112)			453,830
Increase (Decrease) in Stockholders' Equity
Net income							51,691							51,691
Shares issued under the dividend reinvestment plan ("DRP")				867										867
Shares issued under the Employee Stock Purchase Plan ("ESPP")				235										235
Purchase of treasury stock									(625)					(625)
Stock awards granted and distributed		1		(988)					987
Stock awards forfeited				555					(555)
Repurchase of surrendered stock from vesting of stock plans				18					869					887
Share based compensation expense				3,692										3,692
Cash dividend declared							(18,420)							(18,420)
Other comprehensive (loss) income, net of deferred income taxes											6,771			6,771
Balance at Dec. 31, 2019	$ 199	199	$ 356,436	356,436	$ (1,473)	$ 149,230	150,703	$ (1,843)	(1,843)	$ (8,341)	(8,341)	$ (1,473)	$ 495,681	497,154
Increase (Decrease) in Stockholders' Equity
Net income							42,042							42,042
Shares issued under the dividend reinvestment plan ("DRP")				1,012										1,012
Shares issued under the Employee Stock Purchase Plan ("ESPP")				255										255
Purchase of treasury stock									(4,633)					(4,633)
Stock awards granted and distributed				(4,167)					4,167
Stock awards forfeited				222					(222)
Repurchase of surrendered stock from vesting of stock plans				656					2,525					3,181
Share based compensation expense				7,639										7,639
Cash dividend declared							(19,197)							(19,197)
Other comprehensive (loss) income, net of deferred income taxes											(1,787)			(1,787)
Balance at Dec. 31, 2020		$ 199		$ 360,741			$ 172,075		$ (5,056)		$ (10,128)			$ 517,831

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Stockholders' Equity
Shares issued under the dividend reinvestment plan ("DRP") (in shares)	39,600	24,529	25,154
Shares issued under the Employee Stock Purchase Plan ("ESPP") (in shares)	11,413	7,888	3,758
Purchase of treasury stock (in shares)	179,620	22,600
Stock awards granted and distributed (in shares)	136,662	82,210	84,910
Stock awards forfeited (in shares)	6,593	19,531	15,225
Repurchase of surrendered stock from vesting of stock plans (in shares)	95,892	26,583	17,073
Cash dividend declared (in dollars per share)	$ 0.96	$ 0.92	$ 0.92

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 42,042	$ 51,691	$ 39,227
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	11,500	5,700	1,800
Depreciation and amortization of premises and equipment	4,319	4,253	3,822
Net (accretion) and other amortization	(940)	(1,375)	(2,093)
Net amortization on securities	3,585	4,365	4,009
Increase in cash surrender value of bank owned life insurance	(2,186)	(2,230)	(2,219)
Amortization of other intangible assets	656	787	917
Share based compensation expense	7,639	3,692	3,487
Net securities (gains) losses	(3,525)	(201)	7,921
Loss on termination of swaps	3,403
Change in fair value of loans held for sale	2,877
(Increase) decrease in accrued interest receivable	(5,658)	328	416
SBA loans originated for sale	(47,741)	(27,419)	(28,340)
Proceeds from sale of the guaranteed portion of SBA loans	52,643	29,922	30,898
Gain on sale of the guaranteed portion of SBA loans	(3,940)	(1,984)	(2,078)
Gain on sale of loans			(441)
(Increase) decrease in other assets	(11,916)	3,942	(2,373)
(Decrease) increase in other liabilities	(5,371)	(1,509)	3,430
Net cash provided by operating activities	47,387	69,962	58,383
Cash flows from investing activities:
Purchases of securities available for sale	(363,224)	(141,297)	(255,746)
Purchases of securities, restricted	(52,988)	(97,206)	(505,272)
Purchases of securities held to maturity			(1,000)
Proceeds from sales of securities available for sale	152,980	46,478	230,372
Redemption of securities, restricted	62,505	88,355	516,593
Maturities, calls and principal payments of securities available for sale	404,093	149,456	92,818
Maturities, calls and principal payments of securities held to maturity	47,505	25,642	20,851
Net increase in loans	(962,582)	(421,024)	(213,973)
Proceeds from loan sale			40,133
Proceeds from sales of other real estate owned ("OREO"), net		297
Purchase of premises and equipment	(5,129)	(3,307)	(5,325)
Net cash used in investing activities	(716,840)	(352,606)	(80,549)
Cash flows from financing activities:
Net increase (decrease) in deposits	1,674,607	(71,728)	551,891
Net decrease in federal funds purchased			(50,000)
Net (decrease) increase in FHLB advances	(220,000)	194,568	(260,855)
Net increase (decrease) in repurchase agreements	224	460	(338)
Net proceeds from issuance of common stock	1,267	1,102	1,017
Purchase of treasury stock	(4,633)	(625)
Repurchase of surrendered stock from vesting of stock plans	(3,181)	(887)	(586)
Cash dividends paid	(19,197)	(18,420)	(18,342)
Net cash provided by financing activities	1,429,087	104,470	222,787
Net increase (decrease) in cash and cash equivalents	759,634	(178,174)	200,621
Cash and cash equivalents at beginning of period	117,194	295,368	94,747
Cash and cash equivalents at end of period	876,828	117,194	295,368
Cash paid for:
Interest	24,037	39,395	32,254
Income taxes	12,457	9,158	2,474
Non-cash investing and financing activities:
Transfers from portfolio loans to loans held for sale	$ 43,019	$ 12,643
Transfers from portfolio loans to other real estate owned			$ 175

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations and Principles of Consolidation On February 1, 2021, Dime Community Bancshares, Inc., (“Legacy Dime”) merged with and into Bridge Bancorp, Inc., (“Legacy Bridge”) (the “Merger”), with Legacy Bridge as the surviving corporation under the name “Dime Community Bancshares, Inc.” (the “Holding Company”). The consolidated financial statements include the Holding Company, which was known as “Bridge Bancorp, Inc.” prior to the Merger, a bank holding company incorporated under the laws of the State of New York, engaged in commercial banking and financial services through its wholly-owned subsidiary, Dime Community Bank, (the “Bank”), which was known as “BNB Bank” prior to the Merger, together referred to as the “Company.” The Bank’s operations include its real estate investment trust subsidiary, Bridgehampton Community, Inc.; a financial title insurance subsidiary, Bridge Abstract LLC (“Bridge Abstract”); and an investment services subsidiary, Bridge Financial Services, Inc. (“Bridge Financial Services”). Intercompany transactions and balances are eliminated in consolidation. The Company’s consolidated financial statements, including notes thereto, and accounting policies and practices are as of December 31, 2020, and do not include the operations of Legacy Dime. The Company provides financial services through its branches in its primary market areas of Suffolk and Nassau Counties on Long Island and the New York City boroughs. The Bank’s primary deposit products are time, savings and demand deposits from the consumers, businesses and local municipalities in its market area. Its primary lending products are commercial real estate, multi-family, commercial and industrial, and residential mortgage loans. There are no significant concentrations of loans to any one industry or customer. However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area. The audited consolidated financial statements presented in this Annual Report on Form 10-K include the collective results of the Holding Company and its wholly-owned subsidiary, the Bank, which are collectively herein referred to as “we”, “us”, “our” and the “Company.” The financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and general practices within the financial institution industry. The following is a description of the significant accounting policies that the Company follows in preparing its consolidated financial statements. Use of Estimates The preparation of financial statements, in conformity with U.S. GAAP, requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the consolidated financial statements and the disclosures provided, and actual future results could differ. COVID-19 Risks In December 2019, a novel coronavirus (“COVID-19”) was reported in China, and, in March 2020, the World Health Organization declared COVID-19 a pandemic. On March 12, 2020, the President of the United States declared the COVID-19 outbreak in the United States a national emergency. The Company’s audited consolidated financial statements reflect the impact of COVID-19 on the assumptions and estimates used. Given the ongoing and dynamic nature of the circumstances, it is difficult to predict the full impact of the COVID-19 outbreak on the Company’s business. The extent of such impact will depend on future developments, which are highly uncertain, including when COVID-19 can be controlled and abated and when and how the economy may be reopened. As the result of the COVID-19 pandemic and the related adverse local and national economic consequences, the Company is subject to the following risks, any of which could have a material, adverse effect on its business, financial condition, liquidity, and results of operations: ● demand for the Company’s products and services may decline, making it difficult to grow assets and income; ● if the economy is unable to substantially reopen or remain open, and high levels of unemployment continue, for an extended period of time, loan delinquencies, problem assets, and foreclosures may increase, resulting in increased charges and reduced income; ● collateral for loans, especially real estate, may decline in value, which could cause loan losses to increase; ● the Company’s allowance for credit losses (“ACL”) may have to be increased if borrowers experience financial difficulties beyond forbearance periods, which will adversely affect the Company’s net income; ● the Company may recognize impairment of its goodwill; ● the net worth and liquidity of loan guarantors may decline, impairing their ability to honor commitments to the Company; ● as the result of the decline in the Federal Reserve Board’s target federal funds rate to near 0%, the yield on the Company’s assets may decline to a greater extent than the decline in its cost of interest-bearing liabilities, reducing net interest margin and spread and reducing net income; ● a material decrease in net income or a net loss over several quarters could result in a decrease in the rate of the Company’s quarterly cash dividend; ● the Company’s cyber security risks are increased as the result of an increase in the number of employees working remotely; and ● the Company relies on third party vendors for certain services and the unavailability of a critical service due to the COVID-19 outbreak could have an adverse effect on the Company. ​ Cash Flows For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, interest- earning deposits with banks, and federal funds sold, which mature overnight. Net cash flows are reported for customer loan and deposit transactions, federal funds purchased, FHLB advances, and repurchase agreements. Securities Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available for sale when they might be sold before maturity. Securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax. Equity securities are carried at fair value, with changes in fair value reported in net income. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting in observable price changes in orderly transactions for the identical or a similar investment. Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. The Company has made a policy election to exclude accrued interest from the amortized cost basis of debt securities and report accrued interest separately in accrued interest receivable in the consolidated balance sheet. A debt security is placed on non-accrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on non-accrual is reversed against interest income. There were no non-accrual debt securities at December 31, 2020 and there was no accrued interest related to debt securities reversed against interest income for the year ended December 31, 2020. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. On January 1, 2020, the Company adopted the CECL Standard, which requires that debt securities held to maturity be accounted for under the current expected credit losses model, including historical loss experience and impact of current conditions and reasonable and supportable forecasts, with an associated allowance for credit losses. In addition, while credit losses on debt securities available for sale should be measured in accordance with the other-than-temporary impairment (“OTTI”) framework under current GAAP, the amendments in the CECL Standard require that these credit losses be presented as an allowance for credit losses. For AFS debt securities, a decline in fair value due to credit loss results in recording an allowance for credit losses to the extent the fair value is less than the amortized cost basis. Held to maturity debt securities and the allowance for credit losses To the extent that debt securities in the held-to-maturity portfolio share common risk characteristics, estimated expected credit losses are calculated in a manner like that used for loans held for investment. That is, for pools of such debt securities with common risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities. Expected credit loss on each debt security in the held-to-maturity portfolio that do not share common risk characteristics with any of the pools of debt securities is individually measured based on net realizable value, or the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the recorded amortized cost basis of the security. With respect to certain classes of debt securities, primarily U.S. Treasuries and securities issued by Government Sponsored Entities, the Company considers the history of credit losses, current conditions and reasonable and supportable forecasts, which may indicate that the expectation that nonpayment of the amortized cost basis is or continues to be zero, even if the U.S. government were to technically default. Therefore, for those securities, the Company does not record expected credit losses. Accrued interest receivable is excluded from the estimate of credit losses. Available for sale debt securities and the allowance for credit losses Management evaluates available for sale debt securities for OTTI on at least a quarterly basis, and more frequently when economic or market conditions warrant such evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the near-term prospects of the issuer. Impairment may result from credit deterioration of the issuer or collateral underlying the security. In performing an assessment of whether any decline in fair value is due to a credit loss, all relevant information is considered at the individual security level. For asset-backed securities performance indicators considered related to the underlying assets include default rates, delinquency rates, percentage of non-performing assets, debt-to-collateral ratios, third party guarantees, current levels of subordination, vintage, geographic concentration, analyst reports and forecasts, credit ratings and other market data. In assessing whether a credit loss exists, we compare the present value of cash flows expected to be collected from the security with 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 for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount the fair value is less than amortized cost basis. Declines in fair value that have not been recorded through an allowance for credit losses, such as declines due to changes in market interest rates, are excluded from earnings and reported, net of tax, in other comprehensive income (“OCI”). Management also assesses whether it intends to sell or is more likely than not that it will be required to sell a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. Accrued interest receivable is excluded from the estimate of credit losses. Securities, Restricted Securities, restricted represents FHLB, Federal Reserve Bank (“FRB”) and bankers’ banks stock, which are reported at cost. The Bank is a member of the FHLB system. Members are required to own a particular amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Loans Held for Sale Loans held for sale are carried at the lower of aggregate cost or estimated fair value. Any subsequent declines in fair value below the initial carrying value are recorded as a valuation allowance, which is established through a charge to earnings. Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of partial charge-offs, deferred origination costs and fees and purchase premiums and discounts. Loan origination and commitment fees and certain direct and indirect costs incurred in connection with loan originations are deferred and amortized to income over the life of the related loans as an adjustment to yield. When a loan prepays, the remaining unamortized net deferred origination fees or costs are recognized in the current year. Interest on loans is credited to income based on the principal outstanding during the period. The Company has made a policy election to exclude accrued interest from the amortized cost basis of loans and report accrued interest separately from the related loan balance in accrued interest receivable on consolidated balance sheets. Past due status is based on the contractual terms of the loan. Loans that are 90 days past due are automatically placed on non-accrual and previously accrued interest is reversed and charged against interest income. However, if the loan is in the process of collection and the Bank has reasonable assurance that the loan will be fully collectable based upon an individual loan evaluation assessing such factors as collateral and collectability, accrued interest will be recognized as earned. If a payment is received when a loan is non-accrual or a troubled debt restructuring (“TDR”) loan is non-accrual, the payment is applied to the principal balance. A TDR loan performing in accordance with its modified terms is maintained on accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Loans that were acquired through the acquisition of Community National Bank on June 19, 2015 and First National Bank of New York on February 14, 2014 were initially recorded at fair value with no carryover of the related allowance for loan losses. After acquisition, losses are recognized through the allowance for loan losses. Determining fair value of the loans involves estimating the amount and timing of expected principal and interest cash flows to be collected on the loans and discounting those cash flows at a market interest rate. Some of the loans at the time of acquisition showed evidence of credit deterioration since origination. These loans were considered purchased credit impaired (“PCI”) loans. As of December 31, 2019, the remaining balance of PCI loans was immaterial to the Company’s financial condition and results of operations. Unless otherwise noted, the above policy is applied consistently to all loan segments. Allowance for Credit Losses On January 1, 2020, we adopted the CECL Standard, which requires that loans held for investment be accounted for under the current expected credit losses model. Although the CARES Act provided the option to delay the adoption of the current expected credit loss model until the earlier of December 31, 2020 or the termination of the current national emergency declaration related to the COVID-19 outbreak, we implemented the CECL Standard in the first quarter of 2020 as previously planned. The allowance for credit losses is established and maintained through a provision for credit losses based on expected losses inherent in our loan portfolio. Management evaluates the adequacy of the allowance on a quarterly basis. Management monitors its entire loan portfolio regularly, with consideration given to detailed analysis of classified loans, repayment patterns, past loss experience, various types of concentrations of credit, current economic conditions, and reasonable and supportable forecasts. Additions to the allowance are charged to expense and realized losses, net of recoveries, are charged against the allowance. The credit loss estimation process involves procedures to appropriately consider the unique characteristics of our loan portfolio segments. These segments are further disaggregated into loan risk ratings, the level at which credit risk is monitored. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on expected loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and provision for credit losses in those future periods. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in our process for estimation of expected credit losses. The allowance level is influenced by loan volumes, loan risk rating migration, historic loss experience and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: (1) an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and (2) a pooled component for estimated expected credit losses for pools of loans that share similar risk characteristics. Loans that do not share similar credit risk characteristics For a loan that does not share risk characteristics with other loans, expected credit loss is measured based on net realizable value, that is, the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the amortized cost basis of the loan. For these loans, the Company recognizes expected credit loss equal to the amount by which the net realizable value of the loan is less than the amortized cost basis of the loan (which is net of previous charge-offs), except when the loan is collateral dependent, that is, when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. In these cases, expected credit loss is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral. The fair value of the collateral is adjusted for the estimated costs to sell the loan if repayment or satisfaction of a loan is dependent on the sale (rather than only on the operation) of the collateral. The fair value of real estate collateral is determined based on recent appraised values. Appraisals are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. All appraisals undergo a second review process to ensure that the methodology employed and the values derived are reasonable. Generally, collateral values for real estate loans for which measurement of expected losses is dependent on collateral values are updated every twelve months. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation and management’s expertise and knowledge of the borrower and its business. Once the expected credit loss amount is determined, an allowance is provided for equal to the calculated expected credit loss and included in the allowance for credit losses. Pursuant to the Company’s policy, credit losses must be charged-off in the period the loans, or portions thereof, are deemed uncollectable. Loans that share similar credit risk characteristics In estimating the component of the allowance for credit losses for loans that share similar risk characteristics with other loans, such loans are segmented into loan types. Loans are designated into loan pools with similar risk characteristics based on product type in conjunction with other homogeneous characteristics. Loan types include commercial real estate mortgages, owner and non-owner occupied; multi-family mortgage loans; residential real estate mortgages and home equity loans; commercial, industrial and agricultural loans, real estate construction and land loans; and consumer loans. In determining the allowance for credit losses, the Company derives an estimated credit loss assumption from a model that categorizes loan pools based on loan type and further segmented by risk rating. This model is known as Probability of Default/Loss Given Default, utilizing a Transition Matrix approach. This model calculates an expected loss percentage for each loan pool by considering the probability of default, based upon the historical transition or migration of loans from performing (various pass ratings) to criticized, and classified risk ratings to default by risk rating buckets using life-of-loan analysis runout periods for all loan segments, and the historical severity of loss, based on the aggregate net lifetime losses (loss given default) per loan pool. The default trigger, which is defined as the earlier of ninety days past-due or non-accrual status, and severity factors used to calculate the allowance for credit losses for loans in pools that share similar risk characteristics with other loans, are adjusted for differences between the historical period used to calculate historical default and loss severity rates and expected conditions over the remaining lives of the loans in the portfolio. These factors include: (1) lending policies and procedures; (2) international, national, regional and local economic business conditions and developments that affect the collectability of the portfolio, including the condition of various markets; (3) the nature and volume of the loan portfolio including the terms of the loans; (4) the experience, ability, and depth of the lending management and other relevant staff; (5) the volume and severity of past due and adversely classified or graded loans and the volume of non-accrual loans; (6) the quality of our loan review system; (7) the value of underlying collateral for collateralized loans; (8) the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and (9) the effect of external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio. Such factors are used to adjust the historical probabilities of default and severity of loss for current conditions that are not reflective of the model results. In addition, the economic factor includes management’s expectation of future conditions based on a reasonable and supportable forecast of the economy. To the extent the lives of the loans in the portfolio extend beyond the period for which a reasonable and supportable forecast can be made (currently two years), the Bank reverts immediately back to the historical rates of default and severity of loss. Management believes that this transition approach to the Probability of Default/Loss Given Default is a relevant calculation of expected credit losses as there is sufficient volume as well as movement in the risk ratings due to the initial grading system as well as timely updates to risk ratings when necessary. Credit risk ratings are based on management’s evaluation of a credit’s cash flow, collateral, guarantor support, financial disclosures, industry trends and strength of borrowers’ management. Future additions or reductions to the allowance may be necessary based on changes in economic, market or other conditions. Changes in estimates could result in a material change in the allowance. In addition, various regulatory agencies, as an integral part of the examination process, periodically review the allowance for credit losses. Such agencies may require the Bank to recognize adjustments to the allowance based on their judgments of the information available to them at the time of their examination. A loan is considered a potential charge-off when it is in default of either principal or interest for a period of 90, 120 or 180 days, depending upon the loan type, as of the end of the prior month. In addition to delinquency criteria, other triggering events may include, but are not limited to, notice of bankruptcy by the borrower or guarantor, death of the borrower, and deficiency balance from the sale of collateral. Unless otherwise noted, the above policy is applied consistently to all loan portfolio segments. Loan Commitments and Related Financial Instruments Financial instruments include off-balance sheet credit instruments, such as unused lines of credit, commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded on the balance sheet when they are funded. In accordance with the CECL Standard, the Company maintains a separate reserve for off-balance sheet credit instruments, which is included in other liabilities on the consolidated statements of financial condition. Management estimates the amount of expected losses by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by the Company and applying the loss factors, current conditions and forecasting adjustments used in the allowance for credit loss methodology to the results of the usage calculation to estimate the liability for credit losses related to unfunded commitments for each loan type. No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by the Company. At December 31, 2020, the reserve for off-balance sheet credit exposures was immaterial to the Company’s consolidated statements of financial condition and results of operations. Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation. Buildings and related components are depreciated using the straight-line method with a useful life of fifty years for buildings and a range of two Improvements and major repairs are capitalized, while the cost of ordinary maintenance, repairs and minor improvements are charged to expense. Bank-Owned Life Insurance The Bank is the owner and beneficiary of life insurance policies on certain employees. Bank-owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Other Real Estate Owned Real estate properties acquired through, or in lieu of, foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at the lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Goodwill and Other Intangible Assets Goodwill resulting from business combinations is generally determined as the excess of the fair value of the consideration transferred over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and indefinite-lived intangible assets are not amortized, but tested for impairment at least annually, or more frequently if events and circumstances exist that indicate the carrying amount of the asset may be impaired. The Company has selected November 30 as the date to perform the annual impairment test. Goodwill and the BNB Bank Other intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible assets are amortized on an accelerated method over their estimated useful lives of ten years. Other intangible assets also include servicing rights, which result from the sale of SBA loans with servicing rights retained. Servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Servicing assets are subsequently measured using the amortization method, which requires servicing rights to be amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Derivatives The Company records cash flow hedges at the inception of the derivative contract based on the Company’s intentions and belief as to likely effectiveness as a hedge. Cash flow hedges represent a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income (“OCI”) and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. The changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as non-interest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in non-interest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2020
SECURITIES.
SECURITIES	2. SECURITIES The following table summarizes the amortized cost and estimated fair value of the available for sale and held to maturity investment securities portfolio at December 31, 2020 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) and gross unrecognized gains and losses, respectively: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (In thousands) Cost Gains Losses Value Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 40,448 $ 1,650 ​ $ (10) $ 42,088 U.S. GSE residential mortgage-backed securities ​ 111,398 ​ 1,843 ​ (6) ​ 113,235 U.S. GSE residential collateralized mortgage obligations ​ 127,369 ​ 1,661 ​ (226) ​ 128,804 U.S. GSE commercial mortgage-backed securities ​ 24,920 ​ 140 ​ (253) ​ 24,807 U.S. GSE commercial collateralized mortgage obligations ​ 61,102 ​ 1,286 ​ (52) ​ 62,336 Other asset backed securities ​ 24,250 ​ — ​ (300) ​ 23,950 Corporate bonds ​ 56,500 ​ 195 ​ (1,555) ​ 55,140 Total available for sale ​ 445,987 ​ 6,775 ​ (2,402) ​ 450,360 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ Amortized ​ Unrecognized ​ Unrecognized ​ Fair (In thousands) Cost Gains Losses Value Held to maturity: ​ ​ ​ ​ ​ ​ State and municipal obligations ​ 23,715 ​ 1,406 ​ — ​ 25,121 U.S. GSE residential mortgage-backed securities ​ 6,272 ​ 227 ​ — ​ 6,499 U.S. GSE residential collateralized mortgage obligations ​ 18,511 ​ 489 ​ (9) ​ 18,991 U.S. GSE commercial mortgage-backed securities ​ 13,069 ​ 625 ​ — ​ 13,694 U.S. GSE commercial collateralized mortgage obligations ​ 24,133 ​ 887 ​ — ​ 25,020 Total held to maturity ​ 85,700 ​ 3,634 ​ (9) ​ 89,325 Total securities ​ $ 531,687 ​ $ 10,409 ​ $ (2,411) ​ $ 539,685 ​ As of December 31, 2020, none of the Company’s available for sale debt securities were in an unrealized loss position due to credit and therefore no allowance for credit losses on available for sale debt securities was required. Additionally, the calculated allowance for credit losses on held to maturity securities was inconsequential given the high quality composition of the Company’s held to maturity portfolio and therefore no allowance for credit losses was recorded. Accrued interest receivable on securities totaling $1.4 million at December 31, 2020 was included in accrued interest receivable in the consolidated balance sheet and excluded from the amortized cost and estimated fair value totals in the table above. ​ The following table summarizes the amortized cost and estimated fair value of the available for sale and held to maturity investment securities portfolio at December 31, 2019 and the corresponding amounts of gross unrealized gains and losses therein: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Gross Gross Estimated ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (In thousands) Cost ​ Gains ​ Losses ​ Value Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,833 ​ $ — ​ $ (11) ​ $ 50,822 U.S. GSE securities ​ ​ 5,000 ​ ​ — ​ ​ (5) ​ ​ 4,995 State and municipal obligations ​ 34,303 ​ 704 ​ (43) ​ 34,964 U.S. GSE residential mortgage-backed securities ​ 84,550 ​ 609 ​ (468) ​ 84,691 U.S. GSE residential collateralized mortgage obligations ​ 278,149 ​ 1,166 ​ (1,464) ​ 277,851 U.S. GSE commercial mortgage-backed securities ​ 13,656 ​ 23 ​ (70) ​ 13,609 U.S. GSE commercial collateralized mortgage obligations ​ 102,722 ​ 1,723 ​ (289) ​ 104,156 Other asset-backed securities ​ 24,250 ​ — ​ (849) ​ 23,401 Corporate bonds ​ 46,000 ​ — ​ (2,198) ​ 43,802 Total available for sale ​ 639,463 ​ 4,225 ​ (5,397) ​ 638,291 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ State and municipal obligations ​ 41,008 ​ 809 ​ — ​ 41,817 U.S. GSE residential mortgage-backed securities ​ 8,142 ​ 5 ​ (54) ​ 8,093 U.S. GSE residential collateralized mortgage obligations ​ 39,936 ​ 624 ​ (62) ​ 40,498 U.S. GSE commercial mortgage-backed securities ​ 17,215 ​ 102 ​ (82) ​ 17,235 U.S. GSE commercial collateralized mortgage obligations ​ 27,337 ​ 191 ​ (144) ​ 27,384 Total held to maturity ​ 133,638 ​ 1,731 ​ (342) ​ 135,027 Total securities ​ $ 773,101 ​ $ 5,956 ​ $ (5,739) ​ $ 773,318 ​ The following table summarizes available for sale debt securities with gross unrealized losses for which an allowance for credit losses has not been recorded at December 31, 2020, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ Greater than 12 months ​ ​ Estimated ​ Gross ​ Estimated ​ Gross ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized (In thousands) Value Losses Value Losses Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 5,310 $ (10) ​ $ — $ — U.S. GSE residential mortgage-backed securities ​ — ​ — ​ 152 ​ (6) U.S. GSE residential collateralized mortgage obligations ​ 55,832 ​ (226) ​ — ​ — U.S. GSE commercial mortgage-backed securities ​ 14,994 ​ (253) ​ — ​ — U.S. GSE commercial collateralized mortgage obligations ​ 11,755 ​ (52) ​ — ​ — Other asset backed securities ​ — ​ — ​ 3,450 ​ (300) Corporate bonds ​ 7,927 ​ (73) ​ 29,518 ​ (1,482) Total available for sale ​ $ 95,818 $ (614) ​ $ 33,120 $ (1,788) The following table summarizes securities with gross unrealized losses at December 31, 2019, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ Greater than 12 months ​ ​ Estimated ​ Gross ​ Estimated ​ Gross ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized (In thousands) Value Losses Value Losses Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,822 ​ $ (11) ​ $ — ​ $ — U.S. GSE securities ​ ​ — ​ ​ — ​ ​ 4,995 ​ ​ (5) State and municipal obligations ​ 4,982 ​ (42) ​ 76 ​ (1) U.S. GSE residential mortgage-backed securities ​ 2,935 ​ (30) ​ 39,617 ​ (438) U.S. GSE residential collateralized mortgage obligations ​ 81,377 ​ (480) ​ 93,403 ​ (984) U.S. GSE commercial mortgage-backed securities ​ 6,648 ​ (70) ​ — ​ — U.S. GSE commercial collateralized mortgage obligations ​ 28,710 ​ (145) ​ 9,614 ​ (144) Other asset-backed securities ​ — ​ — ​ 23,401 ​ (849) Corporate bonds ​ — ​ — ​ 43,802 ​ (2,198) Total available for sale ​ $ 175,474 $ (778) ​ $ 214,908 $ (4,619) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ U.S. GSE residential mortgage-backed securities ​ — ​ — ​ 7,268 ​ (54) U.S. GSE residential collateralized mortgage obligations ​ 6,750 ​ (17) ​ 6,105 ​ (45) U.S. GSE commercial mortgage-backed securities ​ — ​ — ​ 5,034 ​ (82) U.S. GSE commercial collateralized mortgage obligations ​ 13,038 ​ (57) ​ 4,300 ​ (87) Total held to maturity ​ $ 19,788 ​ $ (74) ​ $ 22,707 ​ $ (268) ​ Other-Than-Temporary Impairment Management evaluates available for sale debt securities in unrealized loss positions to determine whether the impairment is due to credit-related factors or noncredit-related factors. Consideration is given to (1) the extent to which the fair value is less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) the intent and ability of the Company to retain its investment in the security for a period of time sufficient to allow for any anticipated recovery in fair value. ​ At December 31, 2020, substantially all of the securities in an unrealized loss position had a variable interest rate and the cause of the temporary impairment was directly related to changes in interest rates. The Company generally views changes in fair value caused by changes in interest rates as temporary, which is consistent with its experience. Other asset backed securities are comprised of student loan backed bonds, which are guaranteed by the U.S. Department of Education for 97% to 100% of principal. Additionally, the bonds have credit support of 3% to 5% and have maintained their Aa3 Moody’s rating during the time the Bank has owned them. The corporate bonds within the portfolio have all maintained an investment grade rating by either Moody’s or Standard and Poor’s. None of the unrealized losses is related to credit losses. The Company does not have the intent to sell these securities and it is more likely than not that it will not be required to sell the securities before their anticipated recovery. The issuers continue to make timely principal and interest payments on the debt. The fair value is expected to recover as the securities approach maturity. Therefore, the Company does not consider these securities to be other-than-temporarily impaired at December 31, 2020. Sales and Calls of Securities There were $153.0 million of proceeds on sales of available for sale securities with gross gains of approximately $4.3 million and gross losses of approximately $0.8 million realized in 2020. There were $46.5 million of proceeds on sales of available for sale securities with gross gains of approximately $0.2 million realized in 2019. There were $230.4 million of proceeds on sales of available for sale securities with gross losses of approximately $7.9 million realized in 2018. There were $14.9 million, $20.3 million and $3.3 million of proceeds from calls of securities in 2020, 2019 and 2018, respectively. Pledged Securities Securities having a fair value of $402.8 million and $402.2 million at December 31, 2020 and 2019, respectively, were pledged to secure public deposits and FHLB and FRB overnight borrowings. Trading Securities The Company did not hold any trading securities during the years ended December 31, 2020 and 2019. Restricted Securities The Bank is a member of the FHLB of New York. Members are required to own a particular amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. The Bank is a member of the Atlantic Central Banker’s Bank (“ACBB”) and is required to own ACBB stock. The Bank is also a member of the FRB system and required to own FRB stock. FHLB, ACBB and FRB stock is carried at cost and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. The Bank owned $23.4 million and $32.9 million in FHLB, ACBB and FRB stock at December 31, 2020 and 2019, respectively. These amounts were reported as restricted securities in the consolidated balance sheets. As of December 31, 2020 and 2019, there was no issuer, other than the U.S. Government and its sponsored entities, where the Bank had invested holdings that exceeded 10% of consolidated stockholders’ equity. ​ The following table summarizes the amortized cost and estimated fair value by contractual maturity of the available for sale and held to maturity investment securities portfolio at December 31, 2020. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Amortized ​ Estimated (In thousands) Cost Fair Value Maturity ​ ​ ​ ​ ​ ​ Available for sale: ​ ​ ​ ​ ​ ​ Within one year $ 4,131 $ 4,116 One to five years ​ ​ 58,608 ​ ​ 58,861 Five to ten years ​ ​ 38,415 ​ ​ 38,597 Beyond ten years ​ ​ 344,833 ​ ​ 348,786 Total $ 445,987 $ 450,360 ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ Within one year $ 1,885 $ 1,902 One to five years ​ ​ 23,140 ​ ​ 24,452 Five to ten years ​ ​ 11,535 ​ ​ 12,144 Beyond ten years ​ ​ 49,140 ​ ​ 50,827 Total $ 85,700 $ 89,325 ​

FAIR VALUE

FAIR VALUE	12 Months Ended
	Dec. 31, 2020
FAIR VALUE.
FAIR VALUE	3. FAIR VALUE The Company adopted ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities FASB ASC 820-10 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820-10 also establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair values: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other 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. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. The following tables summarize assets and liabilities measured at fair value on a recurring basis: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Financial assets: ​ ​ ​ ​ ​ ​ ​ Available for sale securities: ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 42,088 ​ ​ $ 42,088 ​ U.S. GSE residential mortgage-backed securities ​ 113,235 ​ ​ 113,235 ​ U.S. GSE residential collateralized mortgage obligations ​ 128,804 ​ ​ 128,804 ​ U.S. GSE commercial mortgage-backed securities ​ 24,807 ​ ​ 24,807 ​ U.S. GSE commercial collateralized mortgage obligations ​ 62,336 ​ ​ 62,336 ​ Other asset-backed securities ​ 23,950 ​ ​ 23,950 ​ Corporate bonds ​ 55,140 ​ ​ 55,140 ​ Total available for sale securities ​ $ 450,360 ​ ​ ​ $ 450,360 ​ Derivatives ​ $ 49,662 ​ ​ ​ $ 49,662 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Derivatives ​ $ 56,417 ​ ​ ​ $ 56,417 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,822 ​ ​ ​ $ 50,822 ​ ​ U.S. GSE securities ​ ​ 4,995 ​ ​ ​ ​ 4,995 ​ State and municipal obligations ​ 34,964 ​ ​ 34,964 ​ U.S. GSE residential mortgage-backed securities ​ 84,691 ​ ​ 84,691 ​ U.S. GSE residential collateralized mortgage obligations ​ 277,851 ​ ​ 277,851 ​ U.S. GSE commercial mortgage-backed securities ​ 13,609 ​ ​ 13,609 ​ U.S. GSE commercial collateralized mortgage obligations ​ 104,156 ​ ​ 104,156 ​ Other asset-backed securities ​ 23,401 ​ ​ 23,401 ​ Corporate bonds ​ 43,802 ​ ​ 43,802 ​ Total available for sale securities ​ $ 638,291 ​ ​ ​ $ 638,291 ​ Derivatives ​ $ 15,437 ​ ​ ​ $ 15,437 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Derivatives ​ $ 16,645 ​ ​ ​ $ 16,645 ​ ​ The following tables summarize assets measured at fair value on a non-recurring basis: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Loans held for sale ​ $ 52,785 $ 42,785 ​ ​ $ 10,000 Individually evaluated loans ​ $ 2,940 ​ ​ ​ $ 2,940 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ ​ Assets ​ Inputs ​ Inputs (In thousands) Value ​ (Level 1) (Level 2) (Level 3) Loans held for sale ​ $ 12,643 ​ ​ ​ ​ $ 12,643 Impaired loans ​ $ 6,981 ​ ​ $ 6,981 ​ Loans held for sale at December 31, 2020 had a carrying amount of $52.8 million which is net of a $2.9 million valuation allowance. Loans held for sale at December 31, 2019 had a carrying amount of $12.6 million with no valuation allowance recorded. Individually evaluated commercial and industrial loans with an allowance for credit losses at December 31, 2020 had a carrying amount of $2.9 million, which is made up of the outstanding balance of $9.6 million, net of a valuation allowance of $6.7 million. This resulted in an additional provision for credit losses of $2.6 million that is included in the amount reported on the consolidated statements of income for the year ended December 31, 2020. Impaired loans (prior to the adoption of the CECL standard) with an allocated allowance for loan losses at December 31, 2019 had a carrying amount of $7.0 million, which is made up of the outstanding balance of $11.7 million, net of a valuation allowance of $4.7 million. There was no other real estate owned at December 31, 2020 and 2019. Accordingly, there was no additional provision for credit losses included in the amount reported on the consolidated statements of income. The Company used the following methods and assumptions in estimating the fair value of its financial instruments: Securities Available for Sale and Held to Maturity: Derivatives: Loans Held for Sale: At December 31, 2020 the leveraged lending portfolio was reclassified to held for sale and sold in January 2021.The estimated fair values at December 31, 2020 were based on the observable market prices for the loans, resulting in a Level 1 classification. Individually Evaluated Loans with an ACL (Impaired Loans with an ACL prior to the adoption of the CECL Standard) and Other Real Estate Owned: Appraisals for collateral-dependent loans are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, the Appraisal and Credit Departments review the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Management also considers the appraisal values for commercial properties associated with current loan origination activity. Collectively, this information is reviewed to help assess current trends in commercial property values. For each collateral dependent loan, management considers information that relates to the type of property to determine if such properties may have appreciated or depreciated in value since the date of the most recent appraisal. Adjustments to fair value are made only when the analysis indicates a probable decline in collateral values. Adjustments made in the appraisal process are not deemed material to the overall consolidated financial statements given the level of collateral dependent loans measured at fair value on a non-recurring basis. The following tables summarize the estimated fair values and recorded carrying amounts of the Company’s financial instruments at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ ​ ​ ​ Quoted Prices In Other Significant ​ ​ ​ Active Markets for Observable Unobservable ​ ​ ​ ​ Carrying Identical Assets Inputs Inputs ​ Total (In thousands) Amount (Level 1) (Level 2) (Level 3) Fair Value Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks $ 107,729 $ 107,729 $ — $ — $ 107,729 Interest-bearing deposits with banks ​ 769,099 ​ 769,099 ​ — ​ — ​ 769,099 Securities available for sale ​ 450,360 ​ — ​ 450,360 ​ — ​ 450,360 Securities restricted ​ 23,362 ​ n/a ​ n/a ​ n/a ​ n/a Securities held to maturity ​ 85,700 ​ — ​ 89,325 ​ — ​ 89,325 Loans held for sale ​ ​ 52,785 ​ ​ 42,785 ​ ​ — ​ ​ 10,000 ​ ​ 52,785 Loans, net ​ 4,553,203 ​ — ​ — ​ 4,554,333 ​ 4,554,333 Derivatives ​ 49,662 ​ — ​ 49,662 ​ — ​ 49,662 Accrued interest receivable ​ 16,566 ​ — ​ 1,421 ​ 15,145 ​ 16,566 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of deposit ​ 288,445 ​ — ​ 290,971 ​ — ​ 290,971 Demand and other deposits ​ 5,200,808 ​ 5,200,808 ​ — ​ — ​ 5,200,808 FHLB advances ​ 215,000 ​ — ​ 221,665 ​ — ​ 221,665 Repurchase agreements ​ 1,223 ​ — ​ 1,223 ​ — ​ 1,223 Subordinated debentures ​ 79,059 ​ — ​ 86,704 ​ — ​ 86,704 Derivatives ​ 56,417 ​ — ​ 56,417 ​ — ​ 56,417 Accrued interest payable ​ 881 ​ — ​ 881 ​ — ​ 881 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ ​ ​ ​ ​ Quoted Prices In Other Significant ​ ​ ​ ​ Active Markets for Observable Unobservable ​ ​ ​ ​ Carrying Identical Assets Inputs Inputs ​ Total (In thousands) Amount (Level 1) (Level 2) (Level 3) Fair Value Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks $ 77,693 $ 77,693 $ — $ — $ 77,693 Interest-bearing deposits with banks ​ 39,501 ​ 39,501 ​ — ​ — ​ 39,501 Securities available for sale ​ 638,291 ​ — ​ 638,291 ​ — ​ 638,291 Securities restricted ​ 32,879 ​ n/a ​ n/a ​ n/a ​ n/a Securities held to maturity ​ 133,638 ​ — ​ 135,027 ​ — ​ 135,027 Loans held for sale ​ ​ 12,643 ​ ​ — ​ ​ — ​ ​ 12,643 ​ ​ 12,643 Loans, net ​ 3,647,499 ​ — ​ — ​ 3,685,770 ​ 3,685,770 Derivatives ​ 15,437 ​ — ​ 15,437 ​ — ​ 15,437 Accrued interest receivable ​ 10,908 ​ — ​ 2,181 ​ 8,727 ​ 10,908 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of deposit ​ 307,977 ​ — ​ 308,660 ​ — ​ 308,660 Demand and other deposits ​ 3,506,670 ​ 3,506,670 ​ — ​ — ​ 3,506,670 FHLB advances ​ 435,000 ​ 195,000 ​ 239,622 ​ — ​ 434,622 Repurchase agreements ​ 999 ​ — ​ 999 ​ — ​ 999 Subordinated debentures ​ 78,920 ​ — ​ 81,010 ​ — ​ 81,010 Derivatives ​ 16,645 ​ — ​ 16,645 ​ — ​ 16,645 Accrued interest payable ​ 1,467 ​ — ​ 1,467 ​ — ​ 1,467 ​

LOANS

LOANS	12 Months Ended
	Dec. 31, 2020
LOANS.
LOANS	4. LOANS The following table sets forth the major classifications of loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (In thousands) December 31, 2020 December 31, 2019 Commercial real estate mortgage loans: ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 557,076 ​ $ 531,088 Non-owner occupied ​ ​ 1,081,443 ​ ​ 1,034,599 Multi-family mortgage loans ​ ​ 899,730 ​ 812,174 Residential real estate mortgage loans ​ 434,689 ​ 493,144 Commercial, industrial and agricultural loans ​ 1,527,147 ​ 679,444 Real estate construction and land loans ​ 82,479 ​ 97,311 Installment/consumer loans ​ 23,019 ​ 24,836 Total loans ​ 4,605,583 ​ 3,672,596 Net deferred loan (fees) costs ​ (8,180) ​ 7,689 Total loans held for investment ​ 4,597,403 ​ 3,680,285 Allowance for credit losses ​ (44,200) ​ (32,786) Loans, net ​ $ 4,553,203 ​ $ 3,647,499 ​ Included in commercial, industrial and agricultural loans at December 31, 2020 was $844.7 million of Paycheck Protection Program (“PPP”) loans. These loans are expected to be fully guaranteed by the SBA and have a nominal allowance for credit losses allocated to them based on the nature of the guarantee. The shift from net deferred loan costs at December 31, 2019 to net deferred loan fees at December 31, 2020 was the result of the net deferred loan fees associated with the PPP loans. Accrued interest receivable on loans totaling $15.1 million at December 31, 2020 and $8.7 million at December 31, 2019 was included in accrued interest receivable in the consolidated balance sheet and excluded from the table above. The increase in accrued interest receivable from December 31, 2019 relates primarily to accrued interest on PPP loans. Loans held for sale, which are not included in the table above, totaled $52.8 million at December 31, 2020 and $12.6 million at December 31, 2019. In December 2020, the Company made a decision to dispose of its $43.0 million leveraged lending portfolio which was previously included in commercial, industrial and agricultural loans. As of December 31, 2020, the leveraged lending portfolio was reclassified from loans held for investment to loans held for sale and written down by $234 thousand to the estimated fair value of the loans in this portfolio of $42.8 million through a valuation allowance which was charged against non-interest income in the consolidated statements of income. As of December 31, 2020 and 2019, one commercial real estate (“CRE”) mortgage loan totaling $10.0 million and $12.6 million, respectively, was classified as held for sale. The loan was reclassified from loans held for investment to loans held for sale and written down from $16.3 million to the loan’s estimated fair value of $12.6 million as of June 30, 2019, through a $3.7 million charge-off during the 2019 second quarter. During the 2020 second quarter, an additional write-down was recognized for the decrease in the estimated fair value of the loan by $2.6 million to $10.0 million through a valuation allowance which was charged against non-interest income in the consolidated statements of income. Lending Risk The principal business of the Bank is lending in CRE mortgage loans, multi-family mortgage loans, residential real estate mortgage loans, construction loans, home equity loans, commercial, industrial and agricultural loans, land loans and consumer loans. The Bank considers its primary lending area to be Nassau and Suffolk Counties located on Long Island and the New York City boroughs. A substantial portion of the Bank’s loans is secured by real estate in these areas. Accordingly, the ultimate collectability of the loan portfolio is susceptible to changes in market and economic conditions in this region. Commercial Real Estate Mortgages Loans in this classification include income producing investment properties and owner-occupied real estate used for business purposes. The underlying properties are located largely in the Bank’s primary market area. The cash flows of the income producing investment properties are adversely impacted by a downturn in the economy as evidenced by increased vacancy rates, which in turn, will have an effect on credit quality. Generally, management seeks to obtain annual financial information for borrowers with loans in excess of $1.0 million in this category. In the case of owner-occupied real estate used for business purposes, a weakened economy and resultant decreased consumer and/or business spending will have an adverse effect on credit quality. Multi-Family Mortgages Loans in this classification include income producing residential investment properties of five or more families. Loans are made to established owners with a proven and demonstrable record of strong performance. Loans are secured by a first mortgage lien on the subject property with a loan to value ratio generally not exceeding 75%. Repayment is derived generally from the rental income generated from the property and may be supplemented by the owners’ personal cash flow. Credit risk arises with an increase in vacancy rates, property mismanagement and the predominance of non-recourse loans that are customary in the industry. Residential Real Estate Mortgages and Home Equity Loans Loans in these classifications are generally secured by owner-occupied 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, can have an effect on the credit quality in this loan class. The Bank generally does not originate loans with a loan-to-value ratio greater than 80% and does not grant subprime loans. Commercial, Industrial and Agricultural Loans Loans in this classification are made to businesses and include term loans, lines of credit, senior secured loans to corporations, equipment financing and taxi medallion loans. Generally, these loans are secured by assets of the business and repayment is expected from the cash flows of the business. A weakened economy, and resultant decreased consumer and/or business spending, will have an effect on the credit quality in this loan class. Real Estate Construction and Land Loans Loans in this classification primarily include land loans to local individuals, contractors and developers for developing the land for sale or for the purpose of making improvements thereon. Repayment is derived primarily from sale of the lots/units including any pre-sold units. Credit risk is affected by market conditions, time to sell at an adequate price and cost overruns. To a lesser extent, this class includes commercial development projects that the Company finances, which in most cases require interest only during construction, and then convert to permanent financing. Construction delays, cost overruns, market conditions and the availability of permanent financing, to the extent such permanent financing is not being provided by the Bank, all affect the credit risk in this loan class. Installment and Consumer Loans Loans in this classification may be either secured or unsecured. Repayment is dependent on the credit quality of the individual borrower and, if applicable, sale of the collateral securing the loan, such as automobiles. Therefore, the overall health of the economy, including unemployment rates and housing prices, will have an effect on the credit quality in this loan class. Credit Quality Indicators The Company categorizes loans into risk categories of pass, watch, special mention, substandard and doubtful based on relevant information about the ability of borrowers to service their debt including repayment patterns, past loss experience, current economic conditions, and various types of concentrations of credit. Assigned risk rating grades are continuously updated as new information is obtained. Loans risk rated special mention, substandard and doubtful are reviewed on a quarterly basis. The Company uses the following definitions for risk rating grades: Pass: Watch: Special mention: Substandard: Doubtful: ​ The following tables represent loans categorized by internally assigned risk grades as of December 31, 2020 and December 31, 2019. In the December 31, 2020 table, the years noted represent the year of origination for non-revolving loans. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (In thousands) ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ 2015 and Prior ​ Revolving ​ Revolving-Term ​ Total Commercial real estate owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 92,053 ​ $ 96,679 ​ $ 47,224 ​ $ 66,320 ​ $ 25,852 ​ $ 153,766 ​ $ — ​ $ — ​ $ 481,894 Watch ​ ​ 727 ​ ​ 1,373 ​ ​ 8,038 ​ ​ 10,737 ​ ​ 3,425 ​ ​ 23,919 ​ ​ — ​ ​ — ​ ​ 48,219 Special mention ​ ​ 1,843 ​ ​ — ​ ​ 3,875 ​ ​ 10,857 ​ ​ 823 ​ ​ 4,600 ​ ​ — ​ ​ — ​ ​ 21,998 Substandard ​ ​ 469 ​ ​ 553 ​ ​ — ​ ​ — ​ ​ 2,426 ​ ​ 1,517 ​ ​ — ​ ​ — ​ ​ 4,965 Total commercial real estate owner occupied ​ ​ 95,092 ​ ​ 98,605 ​ ​ 59,137 ​ ​ 87,914 ​ ​ 32,526 ​ ​ 183,802 ​ ​ — ​ ​ — ​ ​ 557,076 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 181,811 ​ ​ 249,782 ​ ​ 108,086 ​ ​ 180,235 ​ ​ 54,252 ​ ​ 214,620 ​ ​ — ​ ​ — ​ ​ 988,786 Watch ​ ​ 7,314 ​ ​ 7,700 ​ ​ 12,845 ​ ​ 12,117 ​ ​ 12,209 ​ ​ 24,089 ​ ​ — ​ ​ — ​ ​ 76,274 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 290 ​ ​ — ​ ​ — ​ ​ 290 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 9,006 ​ ​ 6,038 ​ ​ 1,049 ​ ​ — ​ ​ — ​ ​ 16,093 Total commercial real estate non-owner occupied ​ ​ 189,125 ​ ​ 257,482 ​ ​ 120,931 ​ ​ 201,358 ​ ​ 72,499 ​ ​ 240,048 ​ ​ — ​ ​ — ​ ​ 1,081,443 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multi-family: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 159,301 ​ ​ 293,752 ​ ​ 40,840 ​ ​ 86,169 ​ ​ 118,846 ​ ​ 106,044 ​ ​ — ​ ​ — ​ ​ 804,952 Watch ​ ​ 15,436 ​ ​ 2,724 ​ ​ — ​ ​ 19,331 ​ ​ 35,976 ​ ​ 12,825 ​ ​ — ​ ​ — ​ ​ 86,292 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,098 ​ ​ — ​ ​ 388 ​ ​ — ​ ​ — ​ ​ 8,486 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multi-family ​ ​ 174,737 ​ ​ 296,476 ​ ​ 40,840 ​ ​ 113,598 ​ ​ 154,822 ​ ​ 119,257 ​ ​ — ​ ​ — ​ ​ 899,730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 20,033 ​ ​ 32,564 ​ ​ 71,903 ​ ​ 95,712 ​ ​ 23,589 ​ ​ 106,518 ​ ​ 53,217 ​ ​ 7,012 ​ ​ 410,548 Watch ​ ​ — ​ ​ — ​ ​ 406 ​ ​ 321 ​ ​ 541 ​ ​ 1,740 ​ ​ — ​ ​ 1,145 ​ ​ 4,153 Special mention ​ ​ — ​ ​ 1,103 ​ ​ 758 ​ ​ — ​ ​ — ​ ​ 6,879 ​ ​ 818 ​ ​ 633 ​ ​ 10,191 Substandard ​ ​ — ​ ​ 466 ​ ​ 569 ​ ​ 937 ​ ​ — ​ ​ 6,967 ​ ​ — ​ ​ 858 ​ ​ 9,797 Total residential real estate ​ ​ 20,033 ​ ​ 34,133 ​ ​ 73,636 ​ ​ 96,970 ​ ​ 24,130 ​ ​ 122,104 ​ ​ 54,035 ​ ​ 9,648 ​ ​ 434,689 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 949,257 ​ ​ 62,410 ​ ​ 30,736 ​ ​ 17,646 ​ ​ 12,685 ​ ​ 26,606 ​ ​ 304,781 ​ ​ 5,086 ​ ​ 1,409,207 Watch ​ ​ 8,062 ​ ​ 6,140 ​ ​ 8,265 ​ ​ 1,574 ​ ​ 1,188 ​ ​ 3,048 ​ ​ 40,448 ​ ​ 1,527 ​ ​ 70,252 Special mention ​ ​ 2,914 ​ ​ 838 ​ ​ 572 ​ ​ 1,507 ​ ​ 545 ​ ​ 1,323 ​ ​ 18,984 ​ ​ 2,073 ​ ​ 28,756 Substandard ​ ​ — ​ ​ 905 ​ ​ 1,233 ​ ​ 3,514 ​ ​ 470 ​ ​ 9,660 ​ ​ 200 ​ ​ 2,950 ​ ​ 18,932 Total commercial, industrial and agricultural ​ ​ 960,233 ​ ​ 70,293 ​ ​ 40,806 ​ ​ 24,241 ​ ​ 14,888 ​ ​ 40,637 ​ ​ 364,413 ​ ​ 11,636 ​ ​ 1,527,147 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate construction and land loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 37,684 ​ ​ 20,948 ​ ​ 8,229 ​ ​ 11,308 ​ ​ — ​ ​ 1,701 ​ ​ — ​ ​ — ​ ​ 79,870 Watch ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,150 ​ ​ — ​ ​ 270 ​ ​ — ​ ​ — ​ ​ 1,420 Special mention ​ ​ — ​ ​ — ​ ​ 1,078 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,078 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 111 ​ ​ — ​ ​ — ​ ​ 111 Total real estate construction and land loans ​ ​ 37,684 ​ ​ 20,948 ​ ​ 9,307 ​ ​ 12,458 ​ ​ — ​ ​ 2,082 ​ ​ — ​ ​ — ​ ​ 82,479 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Installment/consumer loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,656 ​ ​ 215 ​ ​ 166 ​ ​ 93 ​ ​ — ​ ​ 710 ​ ​ 17,382 ​ ​ 1,257 ​ ​ 21,479 Watch ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 496 ​ ​ 40 ​ ​ 536 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 46 ​ ​ 46 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 50 ​ ​ 908 ​ ​ 958 Total installment/consumer loans ​ ​ 1,656 ​ ​ 215 ​ ​ 166 ​ ​ 93 ​ ​ — ​ ​ 710 ​ ​ 17,928 ​ ​ 2,251 ​ ​ 23,019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Loans ​ $ 1,478,560 ​ $ 778,152 ​ $ 344,823 ​ $ 536,632 ​ $ 298,865 ​ $ 708,640 ​ $ 436,376 ​ $ 23,535 ​ $ 4,605,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 511,444 ​ $ 18,426 ​ $ 1,218 ​ $ — ​ $ 531,088 Non-owner occupied ​ 1,022,208 ​ — ​ 12,391 ​ ​ — ​ ​ 1,034,599 Multi-family ​ 811,770 ​ 404 ​ — ​ ​ — ​ ​ 812,174 Residential real estate ​ 475,949 ​ 12,400 ​ 4,795 ​ ​ — ​ ​ 493,144 Commercial, industrial and agricultural ​ 643,413 ​ 15,670 ​ 20,361 ​ ​ — ​ ​ 679,444 Real estate construction and land loans ​ 95,530 ​ — ​ 1,781 ​ ​ — ​ ​ 97,311 Installment/consumer loans ​ 23,976 ​ 103 ​ 757 ​ ​ — ​ ​ 24,836 Total loans ​ $ 3,584,290 ​ $ 47,003 ​ $ 41,303 ​ $ — ​ $ 3,672,596 ​ Past Due and Non-accrual Loans The following tables represent the aging of past due loans as of December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ 90+ Days ​ Non-accrual ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-59 ​ 60-89 ​ Past Due ​ Including 90 ​ Total Past ​ ​ ​ ​ ​ ​ ​ ​ Days ​ Days ​ And ​ Days or More ​ Due and ​ ​ ​ ​ ​ ​ (In thousands) Past Due Past Due Accruing Past Due Non-accrual Current Total Loans Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ — ​ $ — ​ $ — ​ $ 636 ​ $ 636 ​ $ 556,440 ​ $ 557,076 Non-owner occupied ​ — ​ — ​ — ​ 6,771 ​ 6,771 ​ 1,074,672 ​ 1,081,443 Multi-family ​ — ​ — ​ — ​ — ​ — ​ 899,730 ​ 899,730 Residential real estate ​ 3,567 ​ 949 ​ — ​ 2,897 ​ 7,413 ​ 427,276 ​ 434,689 Commercial, industrial and agricultural ​ 2,711 ​ 4,072 ​ — ​ 1,597 ​ 8,380 ​ 1,518,767 ​ 1,527,147 Real estate construction and land loans ​ 210 ​ — ​ — ​ 111 ​ 321 ​ 82,158 ​ 82,479 Installment/consumer loans ​ 100 ​ 4 ​ — ​ 150 ​ 254 ​ 22,765 ​ 23,019 Total loans ​ $ 6,588 ​ $ 5,025 ​ $ — ​ $ 12,162 ​ $ 23,775 ​ $ 4,581,808 ​ $ 4,605,583 ​ In the absence of other intervening factors, loans granted payment deferrals related to COVID-19 are not reported as past due or placed on non-accrual status provided the borrowers have met the criteria in the CARES Act or otherwise have met the criteria included in an interagency statement issued by bank regulatory agencies. During the year ended December 31, 2020, there was $93 thousand in interest earned on non-accrual loans and $406 thousand in accrued interest on non-accrual loans was reversed through interest income. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ 90+ Days ​ Non-accrual ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-59 ​ 60-89 ​ Past Due ​ Including 90 ​ Total Past ​ ​ ​ ​ ​ ​ ​ ​ Days ​ Days ​ And ​ Days or More ​ Due and ​ ​ ​ ​ ​ ​ (In thousands) Past Due Past Due Accruing Past Due Non-accrual Current Total Loans Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 917 ​ $ 433 ​ $ — ​ $ 225 ​ $ 1,575 ​ $ 529,513 ​ $ 531,088 Non-owner occupied ​ 98 ​ — ​ — ​ 512 ​ 610 ​ 1,033,989 ​ 1,034,599 Multi-family ​ — ​ — ​ — ​ — ​ — ​ 812,174 ​ 812,174 Residential real estate ​ 3,053 ​ 747 ​ 343 ​ 2,743 ​ 6,886 ​ 486,258 ​ 493,144 Commercial, industrial and agricultural ​ 273 ​ 721 ​ — ​ 736 ​ 1,730 ​ 677,714 ​ 679,444 Real estate construction and land loans ​ — ​ — ​ — ​ 123 ​ 123 ​ 97,188 ​ 97,311 Installment/consumer loans ​ 124 ​ — ​ — ​ 30 ​ 154 ​ 24,682 ​ 24,836 Total loans ​ $ 4,465 ​ $ 1,901 ​ $ 343 ​ $ 4,369 ​ $ 11,078 ​ $ 3,661,518 ​ $ 3,672,596 ​ There was no other real estate owned at December 31, 2020 and 2019. Troubled Debt Restructurings The terms of certain loans were modified and are considered TDRs. The modification of the terms of such loans generally includes one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. The modification of these loans involved loans to borrowers who were experiencing financial difficulties. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed to determine if that borrower is currently in payment default under any of its obligations or whether there is a probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. ​ The following table presents loans modified as troubled debt restructurings during the years indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Modifications During the Year Ended December 31, ​ ​ 2020 ​ 2019 ​ 2018 ​ ​ ​ ​ Pre- ​ Post- ​ ​ ​ Pre- ​ Post- ​ ​ ​ Pre- ​ Post- ​ ​ ​ ​ Modification ​ Modification ​ ​ ​ Modification ​ Modification ​ ​ ​ Modification ​ Modification ​ ​ ​ ​ Outstanding ​ Outstanding ​ ​ ​ Outstanding ​ Outstanding ​ ​ ​ Outstanding ​ Outstanding ​ ​ Number of ​ Recorded ​ Recorded ​ Number of ​ Recorded ​ Recorded ​ Number of ​ Recorded ​ Recorded (Dollars in thousands) Loans Investment Investment Loans Investment Investment Loans Investment Investment Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ — $ — $ — 3 $ 8,582 $ 8,582 — $ — $ — Non-owner occupied — — — — — — 1 926 926 Residential real estate ​ — ​ — ​ — 1 ​ 338 ​ 338 1 ​ 644 ​ 644 Commercial, industrial and agricultural 3 ​ 1,138 ​ ​ 1,138 15 ​ 12,828 ​ ​ 12,828 10 ​ 7,649 ​ ​ 7,649 Installment/consumer loans — ​ — ​ ​ — — ​ — ​ ​ — — ​ — ​ ​ — Total 3 $ 1,138 $ 1,138 19 $ 21,748 $ 21,748 12 ​ $ 9,219 ​ $ 9,219 ​ There were $1.7 million, $0.1 million and $0.4 million of charge-offs related to TDRs during the years ended December 31, 2020, 2019 and 2018, respectively. During the year ended December 31, 2020 there was one loan modified as a TDR for which there was a payment default within twelve months following the modification. There were two loans modified as TDRs during 2019 and one loan modified as a TDR during 2018 for which there was a payment default within twelve months following the modification. A loan is considered to be in payment default once it is 30 days contractually past due under the modified terms. At December 31, 2020 and 2019, the Company had $346 thousand and $405 thousand, respectively, of non-accrual TDRs and $22.2 million and $26.3 million, respectively, of performing TDRs. The decrease in performing TDRs is primarily due to one TDR relationship which became non-accrual during the 2020 second quarter and totaled $2.7 million at June 30, 2020. In the 2020 third quarter, a settlement agreement was entered into resulting in $1.4 million in payments and a charge-off totaling $1.3 million. At December 31, 2020, three non-accrual TDRs totaling $130 thousand were unsecured and one non-accrual TDR totaling $216 thousand was secured and at December 31, 2019, the non-accrual TDRs were unsecured. The Bank has no commitment to lend additional funds to these debtors. The terms of certain other loans were modified during the year ended December 31, 2020 that did not meet the definition of a TDR. These loans have a total recorded investment at December 31, 2020 of $191.1 million. These loans were to borrowers who were not experiencing financial difficulties. In connection with the COVID-19 relief provided by the CARES Act and interagency guidance issued in March 2020, the Company is hese deferrals are not considered TDRs based on the CARES Act and/or the interagency guidance. Collateral Dependent Loans At December 31, 2020, the Company had collateral dependent loans which were individually evaluated to determine expected credit losses. Collateral dependent commercial, industrial and agricultural loans totaled $9.6 million and had a related allowance for credit losses totaling $6.7 million. The loans were secured by taxi medallions. Collateral dependent commercial real estate loans totaled $10.8 million and had no related allowance for credit losses. Impaired Loans (prior to the adoption of the CECL Standard) At December 31, 2019 the Company had individually impaired loans as defined by FASB ASC 310, “Receivables” of $27.0 million. For a loan to be considered impaired, management determines after review whether it is probable that the Bank will not be able to collect all amounts due according to the contractual terms of the loan agreement. Management applies its normal loan review procedures in making these judgments. Impaired loans include individually classified non- accrual loans and TDRs. At December 31, 2019 impaired loans included $1.1 million in other impaired performing loans related to borrowers with other performing TDRs. For impaired loans, the Bank evaluates the impairment of the loan in accordance with FASB ASC 310-10-35-22. Impairment is determined based on the present value of expected future cash flows discounted at the loan’s effective interest rate. For loans that are collateral dependent, the fair value of the collateral is used to determine the fair value of the loan. The fair value of the collateral is determined based on recent appraised values. The fair value of the collateral or present value of expected cash flows is compared to the carrying value to determine if any write-down or specific loan loss allowance allocation is required. The following tables set forth the recorded investment, unpaid principal balance and related allowance for individually impaired loans at December 31, 2019 and 2018. The tables also set forth the average recorded investment of individually impaired loans and interest income recognized while the loans were impaired during the years ended December 31, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Year Ended December 31, 2019 ​ ​ ​ ​ ​ Unpaid ​ Related ​ Average ​ Interest ​ ​ Recorded ​ Principal ​ Allocated ​ Recorded ​ Income (In thousands) Investment Balance Allowance Investment Recognized With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 3,379 ​ $ 3,401 ​ $ — ​ $ 1,286 ​ $ 41 Non-owner occupied ​ 2,296 ​ 2,296 ​ — ​ 2,149 ​ 99 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ 294 ​ 300 ​ — ​ 74 — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 494 ​ 494 ​ — ​ 287 18 Unsecured ​ ​ 8,863 ​ 8,863 ​ — ​ 6,601 411 Total with no related allowance recorded ​ ​ 15,326 ​ 15,354 ​ — ​ 10,397 ​ 569 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ Owner occupied ​ ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ — — — — — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — ​ — Home equity ​ ​ — ​ — ​ — ​ — ​ — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 9,612 ​ 9,612 ​ 3,435 ​ 6,189 ​ 223 Unsecured ​ ​ 2,045 ​ 2,051 ​ 1,241 ​ 1,838 ​ 86 Total with an allowance recorded ​ ​ 11,657 ​ 11,663 ​ ​ 4,676 ​ 8,027 ​ 309 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ 3,379 ​ 3,401 ​ — ​ 1,286 ​ 41 Non-owner occupied ​ ​ 2,296 ​ 2,296 ​ — ​ 2,149 99 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ 294 ​ 300 ​ — ​ 74 — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 10,106 ​ 10,106 ​ 3,435 ​ 6,476 241 Unsecured ​ ​ 10,908 ​ 10,914 ​ 1,241 ​ 8,439 497 Total ​ $ 26,983 ​ $ 27,017 ​ $ 4,676 ​ $ 18,424 $ 878 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018 ​ Year Ended December 31, 2018 ​ ​ ​ ​ ​ Unpaid ​ Related ​ Average ​ Interest ​ ​ Recorded ​ Principal ​ Allocated ​ Recorded ​ Income (In thousands) Investment Balance Allowance Investment Recognized With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 268 ​ $ 278 ​ $ — ​ $ 177 ​ $ — Non-owner occupied ​ 2,816 ​ 2,816 ​ — 1,583 ​ 88 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ ​ — ​ — — Home equity ​ ​ — ​ — ​ ​ — ​ — — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 8,234 ​ 8,234 ​ ​ — ​ 5,644 196 Unsecured ​ ​ 5,316 ​ 5,316 ​ ​ — ​ 5,127 284 Total with no related allowance recorded ​ ​ 16,634 ​ 16,644 ​ ​ — ​ 12,531 ​ 568 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ — ​ — ​ ​ — ​ — ​ — Non-owner occupied ​ ​ — — ​ — — — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ ​ — ​ — ​ — Home equity ​ ​ — ​ — ​ ​ — ​ — ​ — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 2,721 ​ 2,721 ​ 189 ​ 2,757 ​ 91 Unsecured ​ ​ — ​ — ​ ​ — ​ — ​ — Total with an allowance recorded ​ ​ 2,721 ​ 2,721 ​ ​ 189 ​ 2,757 91 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total: ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ 268 ​ 278 ​ — ​ 177 — Non-owner occupied ​ ​ 2,816 ​ 2,816 ​ — ​ 1,583 88 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ — ​ — ​ — ​ — — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 10,955 ​ 10,955 ​ 189 ​ 8,401 287 Unsecured ​ ​ 5,316 ​ 5,316 ​ — ​ 5,127 284 Total ​ $ 19,355 ​ $ 19,365 ​ $ 189 ​ $ 15,288 $ 659 ​ The recorded investment in loans excludes accrued interest receivable and loan origination fees, net due to immateriality. For purposes of this disclosure, the unpaid principal balance is not reduced for partial charge-offs. Related Party Loans Certain directors, executive officers, and their related parties, including their immediate families and companies in which they are principal owners, were loan customers of the Bank during 2020 and 2019. The following table sets forth selected information about related party loans for the year ended December 31, 2020: ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, (In thousands) 2020 Balance at beginning of period ​ $ 12,349 New loans ​ ​ 724 Repayments ​ ​ (1,575) Balance at end of period ​ $ 11,498 ​ ​ The following tables represent the changes in the allowance for credit losses for the years ended December 31, 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance, prior to adoption of CECL ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 Impact of adopting CECL ​ ​ (7,712) ​ ​ (3,589) ​ ​ 2,182 ​ ​ 8,699 ​ ​ 1,274 ​ ​ 771 ​ ​ 1,625 Charge-offs ​ (1) ​ ​ — ​ ​ — ​ ​ (2,004) ​ ​ — ​ ​ (7) ​ ​ (2,012) Recoveries ​ — ​ — ​ 3 ​ 298 ​ — ​ — ​ 301 Provision (credit) for credit losses ​ 4,097 ​ 496 ​ (1,005) ​ 7,787 ​ (165) ​ 290 ​ 11,500 Ending balance ​ $ 8,534 ​ $ 1,736 ​ $ 3,062 ​ $ 27,363 ​ $ 2,175 ​ $ 1,330 ​ $ 44,200 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2019 ​ ​ ​ ​ ​ Residential Commercial, Real Estate ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ $ 10,792 ​ $ 2,566 ​ $ 3,935 ​ $ 12,722 ​ $ 1,297 ​ $ 106 ​ $ 31,418 Charge-offs ​ (3,670) ​ — ​ — ​ (799) ​ — ​ (13) ​ (4,482) Recoveries ​ 1 ​ — ​ 112 ​ 25 ​ — ​ 12 ​ 150 Provision (credit) for credit losses ​ 5,027 ​ 2,263 ​ (2,165) ​ 635 ​ (231) ​ 171 ​ 5,700 Ending balance ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ $ 11,048 ​ $ 4,521 ​ $ 2,438 ​ $ 12,838 ​ $ 740 ​ $ 122 ​ $ 31,707 Charge-offs ​ — ​ — ​ (24) ​ (2,806) ​ — ​ (11) ​ (2,841) Recoveries ​ — ​ — ​ 3 ​ 747 ​ — ​ 2 ​ 752 (Credit) provision for credit losses ​ (256) ​ (1,955) ​ 1,518 ​ 1,943 ​ 557 ​ (7) ​ 1,800 Ending balance ​ $ 10,792 ​ $ 2,566 ​ $ 3,935 ​ $ 12,722 ​ $ 1,297 ​ $ 106 ​ $ 31,418 ​ The increase in allowance for credit losses in the first half of 2020 was primarily related to the reasonable and supportable forecast component of the newly adopted CECL Standard which includes the impact of the COVID-19 pandemic. The COVID-19 pandemic continues to have a profound impact on economic activity. While there have been some signs of economic improvement during the latter half of 2020, significant uncertainty remains. Management still believes that the economic recovery will continue during 2021 and 2022, however, based on the aforementioned uncertainty and negative impact the virus has had to date, the decision was made to maintain the current risk level for the reasonable and supportable forecast component of the allowance for credit losses as of December 31, 2020. ​ The following table represents the balance in the allowance for loan losses and the recorded investment in loans, as defined under FASB ASC 310-10 (prior to adoption of the CECL Standard), and based on impairment method as of December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ 4,676 ​ $ — ​ $ — ​ $ 4,676 Collectively evaluated for impairment ​ ​ 12,150 ​ ​ 4,829 ​ ​ 1,882 ​ ​ 7,907 ​ ​ 1,066 ​ ​ 276 ​ ​ 28,110 Loans acquired with deteriorated credit quality ​ — ​ ​ — ​ ​ — ​ — ​ — ​ ​ — ​ ​ — Total allowance for loan losses ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ 5,675 ​ $ — ​ $ 294 ​ $ 21,014 ​ $ — ​ $ — ​ $ 26,983 Collectively evaluated for impairment ​ 1,560,012 ​ 812,174 ​ 492,507 ​ 658,430 ​ 97,311 ​ 24,836 ​ 3,645,270 Loans acquired with deteriorated credit quality ​ — ​ — ​ 343 ​ — ​ — ​ — ​ 343 Total loans ​ $ 1,565,687 ​ $ 812,174 ​ $ 493,144 ​ $ 679,444 ​ $ 97,311 ​ $ 24,836 ​ $ 3,672,596 ​ The recorded investment in loans excludes accrued interest receivable and loan origination fees, net due to immateriality.

PREMISES AND EQUIPMENT, NET

PREMISES AND EQUIPMENT, NET	12 Months Ended
	Dec. 31, 2020
PREMISES AND EQUIPMENT, NET
PREMISES AND EQUIPMENT, NET	5. PREMISES AND EQUIPMENT, NET The following table details the components of premises and equipment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Land ​ $ 7,896 ​ $ 7,896 Building and improvements ​ 17,391 ​ 17,271 Furniture, fixtures and equipment ​ 28,682 ​ 25,288 Leasehold improvements ​ 13,355 ​ 12,356 ​ ​ 67,324 ​ 62,811 Accumulated depreciation and amortization ​ (32,452) ​ (28,749) Total premises and equipment, net ​ $ 34,872 ​ $ 34,062 ​ Depreciation and amortization amounted to $4.3 million, $4.3 million and $3.8 million for the years ended December 31, 2020, 2019 and 2018, respectively.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2020
LEASES
LEASES	6. LEASES The Company has operating leases for certain branch locations, corporate offices and equipment. Certain leases contain rent escalation clauses, which are reflected in the Company’s operating lease liabilities. The Company’s lease agreements do not contain any material residual value guarantees, restrictions or covenants. The components of lease cost were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 Lease cost ​ ​ ​ ​ ​ ​ Operating lease cost ​ $ 7,643 ​ $ 7,038 Sublease income ​ ​ (37) ​ ​ (95) Total lease cost ​ $ 7,606 ​ $ 6,943 ​ The Company reports lease cost in occupancy and equipment expense in the consolidated statements of income. The Company subleases a portion of its leased properties to commercial sublessees. Sublease income is included in other operating income in the consolidated statements of income. Supplemental cash flow and balance sheet information related to operating leases were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities ​ ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 7,363 ​ $ 7,019 Operating right-of-use assets obtained in exchange for lease liabilities ​ $ 7,843 ​ $ 48,101 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ December 31, 2019 ​ Weighted-average remaining lease term-operating leases ​ ​ 7.6 years ​ 7.8 years Weighted-average discount rate-operating leases (1) ​ 2.91 % ​ 3.20 % (1) The Company computes the present value of operating lease liabilities using its incremental borrowing rate as the discount rate. Certain leases contain renewal options which are not reflected in the tables below. The exercise of renewal options, which extend the lease term from five The maturities of operating lease liabilities were as follows: ​ ​ ​ ​ ​ (In thousands) December 31, 2020 2021 ​ $ 7,387 2022 ​ ​ 7,260 2023 ​ 6,548 2024 ​ ​ 6,297 2025 ​ 6,177 Thereafter ​ 18,649 Total operating lease payments ​ $ 52,318 Less: Interest ​ ​ (5,605) Present value of operating lease liabilities ​ $ 46,713 ​

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS	7. GOODWILL AND OTHER INTANGIBLE ASSETS FASB ASC 350, Intangibles — Goodwill and Other, requires a company to perform an impairment test on goodwill annually, or more frequently if events or changes in circumstance indicate that the asset might be impaired, by comparing the fair value of such goodwill to its recorded or carrying amount. If the carrying amount of goodwill exceeds the fair value, an impairment charge must be recorded in an amount equal to the excess. The FASB issued ASU No. 2011-08, “Testing Goodwill for Impairment,” which permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in Topic 350. The more-likely-than-not threshold is defined as having a likelihood of more than 50 percent. Goodwill At December 31, 2020 and 2019, the carrying amount of the Company’s goodwill was $106.0 million. The Company tested goodwill for impairment during the fourth quarter of 2020. The Company has one reporting unit, Dime Community Bancshares, Inc., and evaluated goodwill at that reporting unit level. The Company elected to perform a qualitative assessment to determine if it was more likely than not that the fair value of the reporting unit exceeded its carrying value, including goodwill. The qualitative assessment indicated that it was more likely than not that the fair value of the reporting unit exceeded its carrying value and no further testing was required. The results of this assessment indicated that goodwill was not impaired. Other Intangible Assets The Company’s other intangible assets consist of core deposit intangibles, a trademark, and servicing assets. At December 31, 2020 and 2019, the carrying amount of the Company’s servicing assets was $1.7 million and $1.3 million, respectively. Acquired Intangible Assets The following table reflects acquired intangible assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2019 ​ ​ Gross ​ ​ ​ Gross ​ ​ ​ ​ Carrying Accumulated Carrying Accumulated (In thousands) Amount Amortization Amount Amortization Intangible assets subject to amortization: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Core deposit intangibles ​ $ 7,211 ​ $ 5,769 ​ $ 7,211 ​ $ 5,113 Intangible assets not subject to amortization: ​ ​ ​ ​ Trademark ​ 259 ​ — ​ 259 ​ — Total intangible assets ​ $ 7,470 ​ $ 5,769 ​ $ 7,470 ​ $ 5,113 ​ Aggregate amortization expense for intangible assets with finite lives for the years ended December 31, 2020, 2019, and 2018 was $0.7 million, $0.8 million, and $0.9 million, respectively. The Company acquired a trademark related to the Bank’s name change from “Bridgehampton National Bank” to “BNB Bank” during the year ended December 31, 2017. At December 31, 2020 and 2019, the carrying amount of the Company’s trademark was $259 thousand. The following table reflects estimated amortization expense for each of the next five years: ​ ​ ​ ​ ​ (In thousands) Total 2021 ​ $ 530 2022 ​ 413 2023 ​ 281 2024 ​ 164 2025 ​ 54 Total ​ $ 1,442 ​

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2020
DEPOSITS
DEPOSITS	8. DEPOSITS Time Deposits The following table presents the remaining maturities of the Bank’s time deposits at December 31, 2020: ​ ​ ​ ​ ​ (In thousands) Total 2021 ​ $ 238,117 2022 ​ 26,702 2023 ​ 14,258 2024 ​ 4,897 2025 ​ 4,265 Thereafter ​ 206 Total ​ $ 288,445 ​ The deposits that met or exceeded the FDIC insurance limit of $250,000 at December 31, 2020 and 2019 were $121.8 million and $129.6 million, respectively. Deposits from principal officers, directors and their affiliates at December 31, 2020 and 2019 were approximately $25.0 million and $16.7 million, respectively.

SECURITIES SOLD UNDER AGREEMENT

SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE	12 Months Ended
	Dec. 31, 2020
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE.
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE	9. SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE Securities sold under agreements to repurchase totaled $1.2 million at December 31, 2020 and $1.0 million at December 31, 2019. The repurchase agreements were collateralized by investment securities, of which 34% were U.S. GSE residential collateralized mortgage obligations and 66% were U.S. GSE residential mortgage-backed securities with a carrying amount of $2.2 million at December 31, 2020 and 17% were U.S. GSE residential collateralized mortgage obligations and 83% were U.S. GSE residential mortgage-backed securities with a carrying amount of $2.1 million at December 31, 2019. Securities sold under agreements to repurchase are financing arrangements with $1.2 million maturing during the first quarter of 2021. At maturity, the securities underlying the agreements are returned to the Company. The primary risk associated with these secured borrowings is the requirement to pledge a market value-based balance of collateral in excess of the borrowed amount. The excess collateral pledged represents an unsecured exposure to the lending counterparty. As the market value of the collateral changes, both through changes in discount rates and spreads as well as related cash flows, additional collateral may need to be pledged. In accordance with the Company’s policies, eligible counterparties are defined and monitored to minimize exposure. The following table summarizes information concerning securities sold under agreements to repurchase: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Average daily balance during the year ​ $ 1,529 ​ $ 849 ​ Average interest rate during the year ​ 0.05 % 0.05 % Maximum month-end balance during the year ​ $ 1,943 ​ $ 1,037 ​ Weighted average interest rate at year-end ​ 0.05 % 0.05 % ​

FEDERAL HOME LOAN BANK ADVANCES

FEDERAL HOME LOAN BANK ADVANCES	12 Months Ended
	Dec. 31, 2020
FEDERAL HOME LOAN BANK ADVANCES.
FEDERAL HOME LOAN BANK ADVANCES	10. FEDERAL HOME LOAN BANK ADVANCES The following table summarizes information concerning FHLB advances: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Average daily balance during the year ​ $ 284,719 ​ $ 245,283 ​ Average interest rate during the year ​ 1.40 % 1.86 % Maximum month-end balance during the year ​ $ 340,000 ​ $ 435,000 ​ Weighted average interest rate at year-end ​ 0.35 % 1.82 % ​ The following tables present the contractual maturities and weighted average interest rates of FHLB advances for each of the next five years. There are no FHLB advances with contractual maturities after 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (Dollars in thousands) ​ ​ ​ ​ Weighted Contractual Maturity Amount Average Rate Overnight ​ $ — ​ — % ​ ​ ​ ​ ​ ​ ​ 2021 ​ 215,000 0.35 ​ Total FHLB advances ​ $ 215,000 0.35 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 (Dollars in thousands) ​ ​ ​ ​ Weighted Contractual Maturity Amount Average Overnight ​ $ 195,000 ​ 1.81 % ​ ​ ​ ​ ​ ​ ​ 2020 ​ 240,000 1.84 ​ Total FHLB advances ​ $ 435,000 1.82 % ​ Each advance is payable at its maturity date, with a prepayment penalty for fixed rate advances. The advances were collateralized by $1.7 billion and $1.4 billion of residential and commercial mortgage loans under a blanket lien arrangement at December 31, 2020 and 2019, respectively. Based on this collateral and the Company’s holdings of FHLB stock, the Company was eligible to borrow up to a total of $1.9 billion at December 31, 2020.

SUBORDINATED DEBENTURES

SUBORDINATED DEBENTURES	12 Months Ended
	Dec. 31, 2020
SUBORDINATED DEBENTURES.
SUBORDINATED DEBENTURES	11. SUBORDINATED DEBENTURES In September 2015, the Company issued $80.0 million in aggregate principal amount of fixed-to-floating rate subordinated debentures. $40.0 million of the subordinated debentures are callable at par after five years, have a stated maturity of September 30, 2025 and bear interest at a fixed annual rate of 5.25% per year, from and including September 21, 2015 until but excluding September 30, 2020. From and including September 30, 2020 to the maturity date or early redemption date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR plus 360 basis points. The remaining $40.0 million of the subordinated debentures are callable at par after ten years, have a stated maturity of September 30, 2030 and bear interest at a fixed annual rate of 5.75% per year, from and including September 21, 2015 until but excluding September 30, 2025. From and including September 30, 2025 to the maturity date or early redemption date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR plus 345 basis points. The subordinated debentures totaled $79.1 million at December 31, 2020 and $78.9 million at December 31, 2019. The subordinated debentures are included in tier 2 capital (with certain limitations applicable) under current regulatory guidelines and interpretations.

DERIVATIVES

DERIVATIVES	12 Months Ended
	Dec. 31, 2020
DERIVATIVES.
DERIVATIVES	12. DERIVATIVES During the first quarter of 2019 the Company adopted ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities The Alternative Reference Rates Committee ("ARRC") has proposed that the Secured Overnight Funding Rate ("SOFR") replace USD-LIBOR. ARRC has proposed that the transition to SOFR from USD-LIBOR will take place by the end of 2021. The Company has material contracts that are indexed to USD-LIBOR. Industry organizations are currently working on the transition plan. The Company is currently monitoring this activity and evaluating the risks involved. Cash Flow Hedges of Interest Rate Risk As part of its asset liability management, the Company utilizes interest rate swap agreements to help manage its interest rate risk position. The notional amount of the interest rate swap does not represent the amount exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual interest rate swap agreements. Interest rate swaps with notional amounts totaling $280.0 million and $290.0 million as of December 31, 2020 and 2019, respectively, were designated as cash flow hedges of certain FHLB advances. The swaps were determined to be fully effective during the periods presented. The aggregate fair value of the swaps is recorded in other assets or other liabilities with changes in fair value recorded in other comprehensive income (loss). The amount included in accumulated other comprehensive income (loss) would be reclassified to current earnings should the hedges no longer be considered effective. The Company expects the hedges to remain fully effective during the remaining term of the swaps. The following table summarizes information about the interest rate swaps designated as cash flow hedges at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2020 2019 ​ Notional amounts ​ $ 280,000 ​ $ 290,000 ​ Weighted average pay rates ​ 1.33 % 1.84 % Weighted average receive rates ​ 0.23 % 1.94 % Weighted average maturity ​ 3.14 years 2.91 years ​ Four interest rate swaps, with notional amounts totaling $125.0 million, were terminated resulting in $3.4 million in loss on termination of swaps, which is reported as a component of non-interest income, for the year ended December 31, 2020. ​ Interest expense recorded on these swap transactions totaled $1.7 million during the year ended December 31, 2020. Interest income recorded on these swap transactions totaled $1.6 million and $1.1 million during the years ended December 31, 2019 and 2018, respectively. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest income/expense as interest payments are made/received on the Company’s variable-rate assets/liabilities. During the year ended December 31, 2020, the Company had $1.7 million of reclassifications as a reduction to interest expense. During the year ended December 31, 2020, the Company accelerated the reclassification of $3.4 million loss from other comprehensive income to earnings as a result of hedged forecasted transactions becoming probable not to occur. During the next twelve months, the Company estimates that $2.1 million will be reclassified as an increase in interest expense. The following table presents the net gains (losses) recorded in accumulated other comprehensive income and the consolidated statements of income relating to the cash flow derivative instruments for the years ended December 31, 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount of gain (loss) ​ Amount of gain ​ ​ ​ ​ ​ ​ ​ ​ reclassified from ​ reclassified from ​ ​ Amount of (loss) gain ​ Amount of (loss) gain ​ Accumulated OCI ​ Accumulated OCI (In thousands) ​ recognized in OCI ​ recognized in OCI ​ into income ​ into income Interest rate contracts included component excluded component included component excluded component Year ended December 31, 2020 ​ $ (10,455) ​ $ — ​ $ (5,016) ​ $ — Year ended December 31, 2019 ​ ​ (3,601) ​ ​ — ​ ​ 1,588 ​ ​ — Year ended December 31, 2018 ​ ​ 2,493 ​ ​ — ​ ​ 1,068 ​ ​ — ​ The following table reflects the cash flow hedges included in the consolidated balance sheets at the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2019 ​ ​ ​ ​ Fair ​ Fair ​ ​ ​ ​ Fair ​ Fair (In thousands) ​ Notional ​ Value ​ Value ​ Notional ​ Value ​ Value Included in other assets/(liabilities): Amount Asset Liability Amount Asset Liability Interest rate swaps related to FHLB advances ​ $ 215,000 ​ $ — ​ $ (6,651) ​ $ 240,000 ​ $ 1,233 ​ $ (978) Forward starting interest rate swaps related to FHLB advances ​ $ 65,000 ​ $ 11 ​ $ (222) ​ $ 50,000 ​ $ — ​ $ (1,427) ​ Non-Designated Hedges Derivatives not designated as hedges may be used to manage the Company’s exposure to interest rate movements or to provide service to customers but do not meet the requirements for hedge accounting under U.S. GAAP. The Company executes interest rate swaps with commercial lending customers to facilitate their respective risk management strategies. These interest rate swaps with customers are simultaneously offset by interest rate swaps that the Company executes with a third party in order to minimize the net risk exposure resulting from such transactions. These interest-rate swap agreements do not qualify for hedge accounting treatment, and therefore changes in fair value are reported in current period earnings. The Company’s existing credit derivatives result from participations in interest rate swaps provided by external lenders as part of loan participation arrangements, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain lenders which participate in loans. ​ Interest rate swaps with notional amounts totaled $1.1 billion at December 31, 2020. Of the $1.1 billion notional amounts, $548.5 million were from loan customers and $548.5 million were from bank counterparties. Interest rate swaps with notional amounts totaled $823.9 million at December 31, 2019. Of the $823.9 million notional amounts, $411.9 million were from loan customers and $411.9 million were from bank counterparties. The following table presents summary information about the interest rate swaps at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ (Dollars in thousands) 2020 ​ 2019 Notional amounts ​ $ 1,097,100 ​ ​ $ 823,894 Weighted average pay rates ​ ​ 2.94 % ​ ​ 3.75 % Weighted average receive rates ​ ​ 2.94 % ​ ​ 3.75 % Weighted average maturity ​ ​ 10.02 years ​ ​ 10.77 years Fair value of combined interest rate swaps ​ $ — ​ ​ $ — ​ ​ Loan swap fees recorded on these swap transactions, which is reported as a component of non-interest income, totaled $3.7 million, $7.5 million, and $716 thousand for the years ended December 31, 2020, 2019, and 2018, respectively. ​ Credit-Risk-Related Contingent Features As of December 31, 2020, the termination value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $57.1 million, while there were no derivatives in a net asset position. The Company has minimum collateral posting thresholds with certain of its derivative counterparties. If the termination value of derivatives is a net liability position, the Company is required to post collateral against its obligations under the agreements. However, if the termination value of derivatives is a net asset position, the counterparty is required to post collateral to the Company. At December 31, 2020, the Company posted collateral of $57.9 million to its counterparties under the agreements in a net liability position and received no collateral from its counterparties under the agreements in a net asset position. If the Company had breached any of these provisions at December 31, 2020, it could have been required to settle its obligations under the agreements at the termination value.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2020
INCOME TAXES
INCOME TAXES	13. INCOME TAXES The following table details the components of income tax expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Current: ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ $ 16,262 ​ $ 12,665 ​ $ 5,270 State ​ 1,457 ​ 639 ​ 1,023 Total current ​ 17,719 ​ 13,304 ​ 6,293 Deferred: ​ ​ ​ Federal ​ (3,782) ​ (419) ​ 3,299 State ​ (252) ​ 1,175 ​ (451) Total deferred ​ (4,034) ​ 756 ​ 2,848 Total income tax expense ​ $ 13,685 ​ $ 14,060 ​ $ 9,141 ​ The following table is a reconciliation of the expected federal income tax expense at the statutory tax rate to the actual provision: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2020 2019 2018 ​ ​ ​ ​ ​ Percentage ​ ​ ​ ​ Percentage ​ ​ ​ ​ Percentage ​ ​ ​ ​ ​ of Pre-tax ​ ​ ​ ​ of Pre-tax ​ ​ ​ ​ of Pre-tax ​ (Dollars in thousands) Amount Earnings Amount Earnings Amount Earnings ​ Federal income tax expense computed by applying the statutory rate to income before income taxes ​ $ 11,703 ​ 21 % $ 13,808 ​ 21 % $ 10,157 ​ 21 % Tax-exempt income ​ (851) (1) ​ (920) (1) ​ (1,002) (2) ​ State taxes, net of federal income tax benefit ​ 1,214 2 ​ 1,425 2 ​ 1,999 4 ​ Other ​ 1,619 3 ​ (253) (1) ​ (2,013) (4) ​ Income tax expense ​ $ 13,685 25 % $ 14,060 21 % $ 9,141 19 % ​ The following table summarizes the composition of deferred tax assets and liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Deferred tax assets: ​ ​ ​ ​ ​ ​ Allowance for credit losses and off-balance sheet credit exposure ​ $ 13,983 ​ $ 10,305 Net unrealized losses on securities ​ — ​ 343 Compensation and related benefit obligations ​ 1,674 ​ 2,368 Net deferred loan costs and fees ​ ​ 2,588 ​ ​ — Purchase accounting fair value adjustments ​ 3,574 ​ 4,735 Net change in pension and other post-retirement benefits plans ​ 3,608 ​ 2,809 Net operating loss carryforward ​ 786 ​ 3,229 Net loss on cash flow hedges ​ ​ 1,905 ​ ​ 304 Operating lease liabilities ​ ​ 13,684 ​ ​ 13,444 Other ​ 1,234 ​ 200 Total deferred tax assets ​ 43,036 ​ 37,737 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities: ​ ​ Pension and SERP expense ​ (5,366) ​ (4,904) Net unrealized gains on securities ​ ​ (1,285) ​ ​ — Depreciation ​ (546) ​ (956) REIT undistributed net income ​ (3,178) ​ (2,403) Net deferred loan costs and fees ​ — ​ (2,413) State and local taxes ​ (1,345) ​ (1,227) Operating lease right-of-use assets ​ (13,172) ​ (12,934) Other ​ (970) ​ (835) Total deferred tax liabilities ​ (25,862) ​ (25,672) Net deferred tax asset ​ $ 17,174 ​ $ 12,065 ​ The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of the State and City of New York and the State of New Jersey. The Company is no longer subject to examination by taxing authorities for years before 2015. There are no unrecorded tax benefits, and the Company does not expect the total amount of unrecognized income tax benefits to significantly increase in the next twelve months. In connection with the acquisition of FNBNY, the Company acquired a federal net operating loss (“NOL”) carryforward subject to Internal Revenue Code Section 382. The Company recorded a deferred tax asset that it expects to realize within the carryforward period. At December 31, 2020, the remaining federal NOL carryforward was $2.9 million. At December 31, 2020, the Company had New York State NOL carryforward of $2.1 million, and recorded a deferred tax asset that it expects to recover within the carryforward period. At December 31, 2020, the Company had New York City NOL carryforward of zero. The New York State and New York City NOLs at December 31, 2020 included NOLs acquired in connection with the CNB and FNBNY acquisitions.

PENSION AND OTHER POSTRETIREMEN

PENSION AND OTHER POSTRETIREMENT PLANS	12 Months Ended
	Dec. 31, 2020
PENSION AND OTHER POSTRETIREMENT PLANS.
PENSION AND OTHER POSTRETIREMENT PLANS	14. PENSION AND OTHER POSTRETIREMENT PLANS Pension Plan and Supplemental Executive Retirement Plan The Bank maintains a noncontributory pension plan (the “Pension Plan”) covering all eligible employees. The Bank uses a December 31 measurement date for this plan in accordance with FASB ASC 715-30 “Compensation – Retirement Benefits – Defined Benefit Plans – Pension.” During 2012, the Company amended the Pension Plan by revising the formula for determining benefits effective January 1, 2013, except for certain grandfathered employees. Additionally, new employees hired on or after October 1, 2012 are not eligible for the Pension Plan. During 2001, the Bank adopted the Bridgehampton National Bank Supplemental Executive Retirement Plan (“SERP”). As recommended by the Compensation Committee of the Board of Directors and approved by the full Board of Directors, the SERP provides benefits to certain employees, whose benefits under the Pension Plan are limited by the applicable provisions of the Internal Revenue Code. The benefit under the SERP is equal to the additional amount the employee would be entitled to under the Pension Plan and the 401(k) Plan in the absence of such Internal Revenue Code limitations. The assets of the SERP are held in a rabbi trust to maintain the tax-deferred status of the plan and are subject to the general, unsecured creditors of the Company. As a result, the assets of the rabbi trust are reflected on the Company’s consolidated balance sheets. The following table provides information about changes in obligations and plan assets of the defined benefit Pension Plan and the defined benefit plan component of the SERP: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ Year Ended December 31, ​ Year Ended December 31, (In thousands) 2020 2019 2020 2019 Change in benefit obligation: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation at beginning of year ​ $ 28,757 ​ $ 23,611 ​ $ 5,323 ​ $ 3,811 Service cost ​ 940 952 ​ 371 261 Interest cost ​ 794 908 ​ 149 147 Benefits paid and expected expenses ​ (609) (475) ​ (112) (112) Assumption changes and other ​ 3,865 3,761 ​ 238 1,216 Benefit obligation at end of year ​ $ 33,747 ​ $ 28,757 ​ $ 5,969 ​ $ 5,323 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value of plan assets at beginning of year ​ $ 39,745 ​ $ 33,874 ​ $ — ​ $ — Actual return on plan assets ​ 3,764 6,346 ​ — — Employer contribution ​ 1,160 — ​ 112 112 Benefits paid and actual expenses ​ (609) (475) ​ (112) (112) Fair value of plan assets at end of year ​ $ 44,060 ​ $ 39,745 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Funded status at end of year ​ $ 10,313 ​ $ 10,988 ​ $ (5,969) ​ $ (5,323) ​ The following table presents amounts recognized in accumulated other comprehensive income at December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ December 31, ​ December 31, (In thousands) 2020 2019 2020 2019 Net actuarial loss ​ $ 10,572 ​ $ 7,997 ​ $ 2,083 ​ $ 2,071 Prior service cost ​ (408) (484) ​ — — Net amount recognized ​ $ 10,164 ​ $ 7,513 ​ $ 2,083 ​ $ 2,071 ​ As of December 31, 2020, the accumulated benefit obligation was $32.3 million for the Pension Plan and $6.0 million for the SERP. As of December 31, 2019, the accumulated benefit obligation was $27.4 million for the Pension Plan and $3.6 million for the SERP. The following table summarizes the components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ Year Ended December 31, ​ Year Ended December 31, (In thousands) 2020 2019 2018 2020 2019 2018 Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ 940 ​ $ 952 ​ $ 1,106 $ 371 $ 261 $ 290 Interest cost ​ 794 908 794 ​ 149 147 127 Expected return on plan assets ​ (2,905) (2,445) (2,547) ​ — — — Amortization of net loss ​ 431 494 335 ​ 227 70 121 Amortization of prior service credit ​ (77) (77) (77) ​ — — — Amortization of transition obligation ​ — — — ​ — — 5 Net periodic benefit (credit) cost ​ $ (817) ​ $ (168) ​ $ (389) $ 747 $ 478 $ 543 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss (gain) ​ $ 3,006 ​ $ (140) ​ $ 1,980 $ 239 $ 1,216 $ (413) Amortization of net loss ​ (431) (494) (335) ​ (227) (70) (121) Amortization of prior service credit ​ 77 77 77 ​ — — — Amortization of transition obligation ​ — — — ​ — — (5) Total recognized in other comprehensive income ​ $ 2,652 ​ $ (557) ​ $ 1,722 $ 12 $ 1,146 $ (539) ​ The Company's service cost component is reported in the Company's income statement in salaries and employee benefits, which is the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. All other components of net periodic benefit (credit) cost are reported in the other operating expenses income statement line. The estimated net loss and prior service credit for the defined benefit Pension Plan that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year are $650 thousand and $77 thousand, respectively. The estimated net loss for the SERP that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year is $257 thousand. Expected Long-Term Rate of Return The Company’s expected long-term rate of return on Pension Plan assets is a long-term rate based on anticipated Pension Plan asset returns over an extended period of time, taking into account market conditions and broad asset mix considerations. The expected rate of return is a long-term assumption and generally does not change annually. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ December 31, ​ December 31, ​ 2020 2019 2018 2020 2019 2018 Weighted average assumptions used to determine benefit obligations: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 2.33 % 3.10 % 4.14 % 2.28 % 3.08 % 4.13 % Rate of compensation increase 3.00 3.00 3.00 — 5.00 5.00 ​ Weighted average assumptions used to determine net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 3.10 % 4.14 % 3.52 % 3.08 % 4.13 % 3.50 % Rate of compensation increase 3.00 3.00 3.00 — 5.00 5.00 ​ Expected long-term rate of return 7.25 7.25 7.25 — — — ​ ​ Pension Plan Assets The Pension Plan seeks to provide retirement benefits to the employees of the Bank who are entitled to receive benefits under the Pension Plan. The Pension Plan assets are overseen by a committee comprised of management, who meet semi-annually, and sets the investment policy guidelines. The Pension Plan’s overall investment strategy is to achieve a mix of approximately 97% of investments for long‐term growth and 3% for near‐term benefit payments with a wide diversification of asset types, fund strategies, and fund managers. Cash equivalents consist primarily of short-term investment funds. Equity securities primarily include investments in common stock, mutual funds, depository receipts and exchange traded funds. Fixed income securities include corporate bonds, government issues, mortgage-backed securities, high yield securities and mutual funds. The weighted average expected long-term rate of return is estimated based on current trends in Pension Plan assets, as well as projected future rates of return on those assets and reasonable actuarial assumptions based on the guidance provided by Actuarial Standard of Practice No. 27 for the real and nominal rate of investment return for a specific mix of asset classes. The long-term rate of return considers historical returns for the S&P 500 index and corporate bonds representing cumulative returns of approximately 9.5% and 5.0%, respectively. These returns were considered along with the target allocations of asset categories. The following table indicates the target allocations for Plan assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-Average- ​ ​ Target ​ Percentage of Plan Assets ​ Expected Long- ​ ​ ​ Allocation ​ At December 31, ​ term Rate of Asset Category 2021 2020 2019 Return Cash equivalents 0 - 5 % 5.6 % 3.6 % — % Equity securities 45 - 65 ​ 56.8 ​ 57.9 ​ 9.5 ​ Fixed income securities 30 - 50 ​ 37.6 ​ 38.5 ​ 5.0 ​ Total ​ ​ 100.0 ​ 100.0 ​ ​ ​ ​ Except for pooled vehicles and mutual funds, which are governed by the prospectus, and unless expressly authorized by management, the Pension Plan and its investment managers are prohibited from purchasing the following investments: letter stock, private placements, or direct payments; securities not readily marketable; Bridge Bancorp, Inc. stock; pledging or hypothecating securities, except for loans of securities that are fully collateralized; purchasing or selling derivative securities for speculation or leverage; and investments by the investment managers in their own securities, their affiliates or subsidiaries (excluding money market funds). Fair value is defined under FASB ASC 820 as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value under ASC 820 must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value. These levels are described in Note 3 “Fair Value.” In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments valued using the Net Asset Value (“NAV”) are classified as level 2 if the Pension Plan can redeem its investment with the investee at the NAV at the measurement date. If the Pension Plan can never redeem the investment with the investee at the NAV, it is considered as level 3. If the Pension Plan can redeem the investment at the NAV at a future date, the Pension Plan’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset. In accordance with FASB ASC 715-20, the following table represents the Pension Plan’s fair value hierarchy for its financial assets measured at fair value on a recurring basis as of December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices Significant ​ ​ ​ ​ ​ ​ ​ In Active ​ Other ​ ​ Significant ​ ​ ​ ​ ​ Markets for ​ Observable ​ ​ Unobservable ​ ​ Carrying ​ Identical Assets ​ Inputs ​ ​ Inputs (Dollars in thousands) Value (Level 1) (Level 2) ​ (Level 3) Cash and cash equivalents ​ $ 2,452 $ — $ 2,452 $ — Equities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. large cap ​ 15,449 ​ 15,449 ​ — ​ — U.S. mid cap/small cap ​ 3,471 ​ 3,471 ​ — ​ — International ​ 6,029 ​ 6,029 ​ — ​ — Equities blend ​ 74 ​ 74 ​ — ​ — Total equities ​ 25,023 ​ 25,023 ​ — ​ — Fixed income securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ 1,853 ​ 1,853 ​ — ​ — Government ​ 2,342 ​ — ​ 2,342 ​ — Mortgage-backed ​ 2,325 ​ — ​ 2,325 ​ — High yield bonds and bond funds ​ 10,065 ​ — ​ 10,065 ​ — Total fixed income securities ​ 16,585 ​ 1,853 ​ 14,732 ​ — Total plan assets ​ $ 44,060 ​ $ 26,876 ​ $ 17,184 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices Significant ​ ​ ​ ​ ​ ​ ​ In Active ​ Other ​ ​ Significant ​ ​ ​ ​ ​ Markets for ​ Observable ​ ​ Unobservable ​ ​ Carrying ​ Identical Assets ​ Inputs ​ ​ Inputs (Dollars in thousands) Value (Level 1) (Level 2) ​ (Level 3) Cash and cash equivalents ​ $ 1,444 $ — $ 1,444 $ — Equities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. large cap ​ ​ 12,097 ​ 12,097 ​ — ​ — U.S. mid cap/small cap ​ ​ 4,195 ​ 4,195 ​ — ​ — International ​ ​ 6,320 ​ 6,320 ​ — ​ — Equities blend ​ ​ 414 ​ 414 ​ — ​ — Total equities ​ ​ 23,026 ​ 23,026 ​ — ​ — Fixed income securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ ​ 2,024 ​ 2,024 ​ — ​ — Government ​ ​ 2,926 ​ — ​ 2,926 ​ — Mortgage-backed ​ ​ 1,033 ​ — ​ 1,033 ​ — High yield bonds and bond funds ​ ​ 9,292 ​ — ​ 9,292 ​ — Total fixed income securities ​ ​ 15,275 ​ 2,024 ​ 13,251 ​ — Total plan assets ​ $ 39,745 ​ $ 25,050 ​ $ 14,695 ​ $ — ​ The Company has no minimum required pension contribution due to the overfunded status of the plan. Estimated Future Payments The following table summarizes benefits expected to be paid under the Pension Plan and the SERP as of December 31, 2020, which reflect expected future service: ​ ​ ​ ​ ​ ​ ​ Pension and SERP Year (in thousands) 2021 ​ $ 1,093 2022 ​ 1,180 2023 ​ 1,315 2024 ​ 1,318 2025 ​ 1,395 2026-2030 ​ 10,228 ​ 401(k) Plan The Company provides a 401(k) plan, which covers substantially all current employees. Newly hired employees are automatically enrolled in the plan on the 60 th

STOCK-BASED COMPENSATION PLANS

STOCK-BASED COMPENSATION PLANS	12 Months Ended
	Dec. 31, 2020
STOCK-BASED COMPENSATION PLANS.
STOCK-BASED COMPENSATION PLANS	15. STOCK-BASED COMPENSATION PLANS In May 2019, the Company’s shareholders approved the Bridge Bancorp, Inc. 2019 Equity Incentive Plan (the “2019 Equity Incentive Plan”), which provides for the grant of stock-based and other incentive awards to officers, employees and directors of the Company. The 2019 Equity Incentive Plan superseded the Bridge Bancorp, Inc. 2012 Stock-Based Incentive Plan (the “2012 Equity Incentive Plan”). The 2012 Equity Incentive Plan superseded the 2006 Stock-Based Incentive Plan. The maximum number of shares of stock, in the aggregate, that may be granted under the 2019 Equity Incentive Plan as stock options, restricted stock, or restricted stock units is 370,000 plus the number of shares of stock which have been reserved but not issued under the 2012 Equity Incentive Plan, and any awards that are forfeited under the 2012 Equity Incentive Plan after the effective date of the 2019 Equity Incentive Plan. No further grants will be made under the 2012 Equity Incentive Plan. Currently outstanding grants under the 2012 Equity Incentive Plan will not be affected. The number of shares of the Company’s common stock available for stock-based awards under the 2019 Equity Incentive Plan is 370,000 plus 162,738 shares that were remaining under the 2012 Equity Incentive Plan. At December 31, 2020, 436,953 shares remain available for issuance, including shares that may be granted in the form of stock options, RSAs, or RSUs. The Compensation Committee of the Board of Directors determines awards under the 2019 Equity Incentive Plan. The Company accounts for the 2019 Equity Incentive Plan under FASB ASC 718. Stock Options Stock options may be either incentive stock options, which bestow certain tax benefits on the optionee, or non-qualified stock options, not qualifying for such benefits. All options have an exercise price that is not less than the market value of the Company's common stock on the date of the grant. The fair value of each option granted is estimated on the date of the grant using the Black-Scholes option-pricing model. The intrinsic value for stock options is calculated based on the exercise price of the underlying awards and the market price of the Company's common stock as of the exercise or reporting date. During the years ended December 31, 2020, 2019 and 2018, in accordance with the Long Term Incentive Plan (“LTI Plan”) for Named Executive Officers (“NEOs”), the Company granted 69,360, 63,267 and 47,393 stock options, respectively, with an exercise price set to equal a 10.0% premium over the grant date stock price. All of the stock options granted vest ratably over three years. The estimated weighted-average grant-date fair value of all stock options granted in the years ended December 31, 2020, 2019 and 2018 was $4.10, $5.05 and $6.52 per stock option, respectively, using the Black-Scholes option-pricing model with assumptions as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ ​ 2020 2019 ​ 2018 Dividend yield ​ ​ ​ 3.03 % ​ 2.86 % ​ 2.80 % Expected volatility ​ ​ ​ 23.11 ​ ​ 23.80 ​ ​ 27.53 ​ Risk-free interest rate ​ ​ ​ 1.47 ​ ​ 2.52 ​ ​ 2.67 ​ Expected option life ​ ​ ​ 6.0 years ​ 6.0 years ​ 6.5 years ​ Compensation expense attributable to stock options was $425 thousand, $197 thousand and $91 thousand for the years ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, there was $201 thousand of total unrecognized compensation cost related to unvested stock options. The cost is expected to be recognized over a weighted-average period of 0.1 years. ​ The following table summarizes the status of the Company's stock options: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ ​ ​ ​ ​ ​ Number ​ Average ​ Remaining ​ ​ Aggregate ​ ​ of ​ Exercise ​ Contractual ​ ​ Intrinsic (Dollars in thousands, except per share amounts) Options Price Life Value Outstanding, January 1, 2020 ​ 110,660 $ 35.71 ​ ​ ​ ​ ​ ​ ​ Granted ​ 69,360 ​ ​ 34.87 ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2020 ​ 180,020 ​ 35.39 ​ 8.2 years ​ $ — Vested and Exercisable, December 31, 2020 ​ 110,660 ​ 35.71 ​ 7.7 years ​ ​ — ​ ​ ​ ​ ​ Number of ​ Exercise Options Price 69,360 ​ $ 34.87 63,267 ​ ​ 35.35 47,393 ​ ​ 36.19 180,020 ​ ​ ​ ​ Restricted Stock Awards The Company's RSAs are shares of the Company's common stock that are forfeitable and are subject to restrictions on transfer prior to the vesting date. RSAs are forfeited if the award holder departs the Company before vesting. RSAs carry dividend and voting rights from the date of grant. The vesting of time-vested RSAs depends upon the award holder continuing to render services to the Company. The Company's performance-based RSAs vest subject to the achievement of the Company's corporate goals. The following table summarizes the unvested RSA activity for the year ended December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average Grant-Date ​ Shares Fair Value Unvested, January 1, 2020 293,717 ​ $ 30.37 Granted 91,428 ​ ​ 31.02 Vested (289,509) ​ ​ 30.34 Forfeited (6,593) ​ ​ 32.16 Unvested, December 31, 2020 89,043 ​ ​ 31.00 ​ During the year ended December 31, 2020, the Company granted a total of 91,428 RSAs. Of the 91,428 RSAs granted, 57,850 time-vested RSAs vest ratably over five years and 33,578 time-vested RSAs vest ratably over three years. During the year ended December 31, 2019, the Company granted RSAs of 78,952 shares. Of the 78,952 shares granted, 49,925 shares vest over five years and 29,027 shares vest over three years. During the year ended December 31, 2018, the Company granted RSAs of 83,782 shares. Of the 83,782 shares granted, 44,750 shares vest over five years, 13,915 shares vest over three years and 25,117 performance-based RSAs vest ratably over two years, subject to the achievement of the Company’s 2018 corporate goals. As of December 31, 2020, there were 89,043 unvested RSAs, all of which were time-vested RSAs and there were no performance-based RSAs. Compensation expense attributable to RSAs was $5.1 million, $2.2 million and $2.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The total fair value of shares vested during the years ended December 31, 2020, 2019 and 2018, was $8.8 million, $2.5 million and $1.5 million, respectively. As of December 31, 2020, there was $2.2 million of total unrecognized compensation costs related to non-vested RSAs. The cost is expected to be recognized over a weighted-average period of 0.1 years. Restricted Stock Units Long Term Incentive Plan RSUs represent an obligation to deliver shares to an employee at a future date if certain vesting conditions are met. RSUs are subject to a time-based vesting schedule, or the satisfaction of performance conditions, and are settled in shares of the Company's common stock. RSUs do not provide voting rights and RSUs may provide dividend equivalent rights from the date of grant. The following table summarizes the unvested NEO RSU activity for the year ended December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average Grant-Date ​ Shares Fair Value Unvested, January 1, 2020 ​ 85,342 $ 29.59 Granted ​ 26,556 ​ ​ 32.13 Reinvested dividends ​ 4,491 ​ ​ 30.08 Added by performance factor ​ 605 ​ ​ 33.69 Forfeited ​ (6,623) ​ ​ 28.68 Vested ​ (72,096) ​ ​ 29.10 Unvested, December 31, 2020 ​ 38,275 ​ 32.57 ​ During the year ended December 31, 2020 in accordance with the LTI plan for NEOs, the Company granted 26,556 RSUs. Of the 26,556 RSUs granted, 17,943 time-vested RSUs vest ratably over three years and 8,613 performance-based RSUs vest subject to the achievement of the Company’s three-year corporate goal for the three-year period ending December 31, 2022. During the year ended December 31, 2019 in accordance with the LTI plan for NEOs, the Company granted 22,305 RSUs. Of the 22,305 RSUs granted, 13,255 time-vested RSUs vest ratably over five years and 9,050 performance-based RSUs vest subject to the achievement of the Company’s three-year corporate goal for the three-year period ending December 31, 2021. Compensation expense attributable to LTI plan RSUs was $1.6 million, $693 thousand and $462 thousand in connection with these awards for the years ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, there was $0.6 million of total unrecognized compensation cost related to non-vested RSUs. The cost is expected to be recognized over a weighted-average period of 0.1 years. Directors Plan In April 2009, the Company adopted a Directors Deferred Compensation Plan (“Directors Plan”). Under the Directors Plan, independent directors may elect to defer all or a portion of their annual retainer fee in the form of RSUs. In addition, directors receive a non-election retainer in the form of RSUs. These RSUs vest ratably over one year and have dividend rights but no voting rights. In connection with the Directors Plan, the Company recorded expense of $553 thousand, $570 thousand and $560 thousand for the years ended December 31, 2020, 2019 and 2018, respectively. Employee Stock Purchase Plan In May 2018, the Board of Directors adopted, and stockholders approved the Employee Stock Purchase Plan (“ESPP”). A total of 1,000,000 shares of the Company’s common stock have been initially authorized for issuance under the ESPP. Subject to any plan limitations, the ESPP allows eligible employees to contribute, normally through payroll deductions, up to $25 thousand for the purchase of the Company’s common stock at a discounted price per share for any calendar year. Eligible employees purchased 11,413 shares, 7,888 shares and 3,758 shares of the Company’s common stock under the ESPP during the years ended December 31, 2020, 2019 and 2018, respectively. No expense was recorded related to ESPP for the years ended December 31, 2020, 2019 and 2018.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2020
EARNINGS PER SHARE.
EARNINGS PER SHARE	16. EARNINGS PER SHARE FASB ASC 260-10-45 addresses whether instruments granted in share-based payment transactions are participating securities prior to vesting and, therefore, need to be included in the earnings allocation in computing EPS. The RSAs and certain RSUs granted by the Company contain non-forfeitable rights to dividends and therefore are considered participating securities. The two-class method for calculating basic EPS excludes dividends paid to participating securities and any undistributed earnings attributable to participating securities. The following table presents the computation of EPS for the years ended December 31, 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands, except per share data) 2020 2019 2018 Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227 Dividends paid on and earnings allocated to participating securities ​ (872) (1,096) (853) Income attributable to common stock ​ $ 41,170 ​ $ 50,595 ​ $ 38,374 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average common shares outstanding, including participating securities ​ 19,903 19,952 19,875 Weighted average participating securities ​ (409) (424) (434) Weighted average common shares outstanding ​ 19,494 19,528 ​ 19,441 Basic earnings per common share ​ $ 2.11 ​ $ 2.59 ​ $ 1.97 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income attributable to common stock ​ $ 41,170 ​ $ 50,595 ​ $ 38,374 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average common shares outstanding ​ 19,494 19,528 ​ 19,441 Incremental shares from assumed conversions of options and restricted stock units ​ 55 31 27 Weighted average common and equivalent shares outstanding ​ 19,549 19,559 ​ 19,468 Diluted earnings per common share ​ $ 2.11 ​ $ 2.59 ​ $ 1.97 ​ There were 180,020, 110,660 and 47,393 stock options outstanding at December 31, 2020, 2019 and 2018, respectively, that were not included in the computation of diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 because the options’ exercise prices were greater than the average market price of common stock and were, therefore, antidilutive. ​ There were 8,941 RSUs that were antidilutive for the year ended December 31, 2020. There were no RSUs that were antidilutive for the year ended December 31, 2019. There were 3,156 RSUs that were antidilutive for the year ended December 31, 2018.

COMMITMENTS AND CONTINGENCIES A

COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS	12 Months Ended
	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS
COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS	17. COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS In the normal course of business, there are various outstanding commitments and contingent liabilities, such as claims and legal actions, guarantees and commitments to extend credit, which are not reflected in the accompanying consolidated financial statements. No material losses are anticipated as a result of these commitments and contingencies. Loan Commitments and Related Financial Instruments Some financial instruments, such as loan commitments, credit lines, letters of credit, and overdraft protection, are issued to meet customer-financing needs. These are agreements to provide credit or to support the credit of others, as long as conditions established in the contract are met, and usually have expiration dates. Commitments may expire without being used. Off-balance-sheet risk of credit loss exists up to the face amount of these instruments, although material losses are not anticipated. The same credit policies are used to make such commitments as are used for loans, often including obtaining collateral at exercise of the commitment. The following represents commitments outstanding: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Standby letters of credit ​ $ 25,501 ​ $ 23,670 Loan commitments outstanding (1) ​ 150,515 ​ 117,044 Unused lines of credit ​ 808,296 ​ 674,194 Total commitments outstanding ​ $ 984,312 ​ $ 814,908 (1) Of the $150.5 million of loan commitments outstanding at December 31, 2020, $5.1 million are fixed rate commitments and $145.4 million are variable rate commitments. Of the $117.0 million of loan commitments outstanding at December 31, 2019, $5.9 million are fixed rate commitments and $111.1 million are variable rate commitments. Litigation The Company and its subsidiaries are subject to certain pending and threatened legal actions that arise out of the normal course of business. In the opinion of management, the resolution of any such pending or threatened litigation is not expected to have a material adverse effect on the Company’s consolidated financial statements. Other Effective March 26, 2020, the FRB Board reduced the reserve requirement ratios to zero percent, which eliminated reserve requirements for all depository institutions. During 2020, the Bank invested overnight with the FRB and the average balance maintained during 2020 was $342.4 million. During 2020, the Bank maintained an overnight line of credit with the FHLB. The Bank has the ability to borrow against its unencumbered residential and commercial mortgages and investment securities owned by the Bank. At December 31, 2020, the Bank had aggregate lines of credit of $418.0 million with unaffiliated correspondent banks to provide short-term credit for liquidity requirements. Of these aggregate lines of credit, $398.0 million is available on an unsecured basis. As of December 31, 2020, the Bank had no such borrowings outstanding. In March 2001, the Bank entered into a Master Repurchase Agreement with the FHLB whereby the FHLB agrees to purchase securities from the Bank, upon the Bank’s request, with the simultaneous agreement to sell the same or similar securities back to the Bank at a future date. Securities are limited, under the agreement, to government securities, securities issued, guaranteed or collateralized by any agency or instrumentality of the U.S. Government or any government sponsored enterprise, and non-agency AA and AAA rated mortgage-backed securities. At December 31, 2020, there was up to $1.9 billion available for transactions under this agreement, assuming availability of required collateral.

REGULATORY CAPITAL REQUIREMENTS

REGULATORY CAPITAL REQUIREMENTS	12 Months Ended
	Dec. 31, 2020
REGULATORY CAPITAL REQUIREMENTS
REGULATORY CAPITAL REQUIREMENTS	18. REGULATORY CAPITAL REQUIREMENTS The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital requirements that involve quantitative measures of the Company’s and Bank’s assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. The Company’s and Bank’s capital amounts and classifications also are subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total, tier 1, and common equity tier 1 capital to risk-weighted assets and of tier 1 capital to average assets. Tier 1 capital, risk-weighted assets and average assets are as defined by regulation. The required minimums for the Company and Bank are set forth in the tables that follow. The Company and the Bank met all capital adequacy requirements at December 31, 2020 and 2019. Under the Basel III Capital Rules the Company and the Bank are subject to the following minimum capital to risk-weighted assets ratios: a) 4.5% based on common equity tier 1 capital ("CET1"); b) 6.0% based on tier 1 capital; and c) 8.0% based on total regulatory capital. A minimum leverage ratio (tier 1 capital as a percentage of total average assets) of 4.0% is also required under the Basel III Capital Rules. The Basel III Capital Rules additionally require institutions to retain a capital conservation buffer, composed of CET1, of 2.5% above these required minimum capital ratio levels. Including the capital conservation buffer, the Company and the Bank effectively have the following minimum capital to risk-weighted assets ratios: a) 7.0% based on CET1; b) 8.5% based on tier 1 capital; and c) 10.5% based on total regulatory capital. The Company and the Bank made the one-time, permanent election to continue to exclude the effects of accumulated other comprehensive income or loss items included in stockholders’ equity for the purposes of determining the regulatory capital ratios. As of December 31, 2020, the most recent notification from the Federal Deposit Insurance Corporation categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized,” the Bank must maintain minimum total risk-based, tier 1 risk-based, common equity tier 1 risk-based, and tier 1 leverage ratios as set forth in the tables below. Since that notification, there are no conditions or events that management believes have changed the institution’s category. The following tables present actual capital levels and minimum required levels for the Company and the Bank under Basel III rules at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum To Be Well ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Adequacy Requirement with ​ Capitalized Under Prompt ​ ​ ​ Actual Capital ​ Adequacy Requirement ​ Capital Conservation Buffer ​ Corrective Action Provisions ​ (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio ​ Common equity tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 424,652 ​ 10.3 % $ 185,479 ​ 4.5 % $ 288,523 ​ 7.0 % ​ n/a ​ n/a ​ Bank ​ 503,524 ​ 12.2 ​ 185,465 ​ 4.5 ​ 288,502 ​ 7.0 $ 267,895 ​ 6.5 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 537,664 ​ 13.0 ​ 329,740 ​ 8.0 ​ 432,784 ​ 10.5 n/a ​ n/a ​ Bank ​ 544,536 ​ 13.2 ​ 329,716 ​ 8.0 ​ 432,753 ​ 10.5 412,145 ​ 10.0 ​ Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 424,652 ​ 10.3 ​ 247,305 ​ 6.0 ​ 350,349 ​ 8.5 n/a ​ n/a ​ Bank ​ 503,524 ​ 12.2 ​ 247,287 ​ 6.0 ​ 350,324 ​ 8.5 329,716 ​ 8.0 ​ Tier 1 capital to average assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 424,652 ​ 6.8 ​ 249,502 ​ 4.0 ​ n/a ​ n/a n/a ​ n/a ​ Bank ​ 503,524 ​ 8.1 ​ 249,389 ​ 4.0 ​ n/a ​ n/a 311,737 ​ 5.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum To Be Well ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Adequacy Requirement with ​ Capitalized Under Prompt ​ ​ ​ Actual Capital ​ Adequacy Requirement ​ Capital Conservation Buffer ​ Corrective Action Provisions ​ (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio ​ Common equity tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 397,800 ​ 10.2 % $ 176,121 ​ 4.5 % $ 273,967 ​ 7.0 % ​ n/a ​ n/a ​ Bank ​ 474,056 ​ 12.1 ​ 176,114 ​ 4.5 ​ 273,954 ​ 7.0 $ 254,386 ​ 6.5 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 510,862 ​ 13.1 ​ 313,105 ​ 8.0 ​ 410,950 ​ 10.5 n/a ​ n/a ​ Bank ​ 507,118 ​ 13.0 ​ 313,091 ​ 8.0 ​ 410,932 ​ 10.5 391,363 ​ 10.0 ​ Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 397,800 ​ 10.2 ​ 234,828 ​ 6.0 ​ 332,674 ​ 8.5 n/a ​ n/a ​ Bank ​ 474,056 ​ 12.1 ​ 234,818 ​ 6.0 ​ 332,659 ​ 8.5 313,091 ​ 8.0 ​ Tier 1 capital to average assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 397,800 ​ 8.5 ​ 187,386 ​ 4.0 ​ n/a ​ n/a n/a ​ n/a ​ Bank ​ 474,056 ​ 10.1 ​ 187,377 ​ 4.0 ​ n/a ​ n/a 234,222 ​ 5.0 ​ ​

PARENT COMPANY ONLY CONDENSED F

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION	12 Months Ended
	Dec. 31, 2020
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION	19. PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION Condensed financial information of Dime Community Bancshares, Inc. (Parent Company only) follows: Condensed Balance Sheets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Assets: ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 280 $ 3,663 Other assets ​ ​ 554 ​ 174 Investment in the Bank ​ ​ 596,703 ​ 573,410 Total assets ​ $ 597,537 $ 577,247 ​ ​ ​ ​ ​ ​ ​ Liabilities and stockholders’ equity: ​ ​ ​ ​ ​ Subordinated debentures ​ $ 79,059 $ 78,920 Other liabilities ​ ​ 647 ​ 1,173 Total liabilities ​ ​ 79,706 ​ 80,093 ​ ​ ​ ​ ​ ​ ​ Total stockholders’ equity ​ ​ 517,831 ​ 497,154 Total liabilities and stockholders’ equity ​ $ 597,537 $ 577,247 ​ Condensed Statements of Income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Dividends from the Bank ​ $ 26,500 ​ $ 24,500 ​ $ 15,000 Interest expense ​ 4,401 ​ 4,539 ​ 4,539 Non-interest expense ​ 252 ​ 104 ​ 135 Income before income taxes and equity in undistributed earnings of the Bank ​ 21,847 ​ 19,857 ​ 10,326 Income tax benefit ​ (1,280) ​ (994) ​ (1,005) Income before equity in undistributed earnings of the Bank ​ 23,127 ​ 20,851 ​ 11,331 Equity in undistributed earnings of the Bank ​ 18,915 ​ 30,840 ​ 27,896 Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227 ​ Condensed Statements of Cash Flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227 Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ Equity in undistributed earnings of the Bank ​ (18,915) ​ (30,840) ​ (27,896) Amortization ​ 139 ​ 139 ​ 140 (Increase) decrease in other assets ​ (379) ​ (73) ​ 108 (Decrease) increase in other liabilities ​ (526) ​ 39 ​ 11 Net cash provided by operating activities ​ 22,361 ​ 20,956 ​ 11,590 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from financing activities: ​ ​ ​ ​ ​ ​ Net proceeds from issuance of common stock ​ 1,267 ​ 1,102 ​ 1,017 Purchase of treasury stock ​ (4,633) ​ (625) ​ — Repurchase of surrendered stock from vesting of stock plans ​ (3,181) ​ (887) ​ (586) Cash dividends paid ​ (19,197) ​ (18,420) ​ (18,342) Net cash used in financing activities ​ (25,744) ​ (18,830) ​ (17,911) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (decrease) increase in cash and cash equivalents ​ (3,383) ​ 2,126 ​ (6,321) Cash and cash equivalents at beginning of year ​ 3,663 ​ 1,537 ​ 7,858 Cash and cash equivalents at end of year ​ $ 280 ​ $ 3,663 ​ $ 1,537 ​

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	12 Months Ended
	Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	20. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the components of other comprehensive (loss) income and related income tax effects: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Unrealized holding gains (losses) on available for sale securities ​ $ 9,069 $ 15,524 $ (8,429) Reclassification adjustments for (gains) losses realized in income ​ (3,525) (201) 7,921 Income tax effect ​ ​ (1,628) ​ (4,467) ​ 160 Net change in unrealized gains (losses) on available for sale securities ​ ​ 3,916 ​ 10,856 ​ (348) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrealized net losses arising during the period ​ ​ (3,245) ​ (1,076) ​ (1,567) Reclassification adjustments for amortization realized in income ​ ​ 581 ​ 487 ​ 384 Income tax effect ​ ​ 799 ​ 179 ​ 351 Net change in post-retirement obligation ​ ​ (1,865) ​ (410) ​ (832) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in fair value of derivatives used for cash flow hedges ​ ​ (10,455) ​ (3,601) ​ 2,493 Reclassification adjustments for losses (gains) realized in income ​ ​ 5,016 ​ (1,588) ​ (1,068) Income tax effect ​ ​ 1,601 ​ 1,514 ​ (418) Net change in unrealized (losses) gains on cash flow hedges ​ ​ (3,838) ​ (3,675) ​ 1,007 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive (loss) income ​ $ (1,787) $ 6,771 $ (173) ​ The following is a summary of the accumulated other comprehensive (loss) income balances, net of income taxes, at the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ December 31, ​ Comprehensive ​ ​ December 31, (In thousands) 2019 Income (Loss) 2020 Unrealized (losses) gains on available for sale securities ​ $ (829) ​ $ 3,916 ​ $ 3,087 Unrealized losses on pension benefits ​ (6,775) ​ (1,865) ​ (8,640) Unrealized losses on cash flow hedges ​ (737) ​ (3,838) ​ (4,575) Accumulated other comprehensive loss, net of income taxes ​ $ (8,341) ​ $ (1,787) ​ $ (10,128) ​ The following represents the reclassifications out of accumulated other comprehensive (loss) income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ Affected Line Item in the (In thousands) 2020 2019 2018 Consolidated Statements of Income Realized gains (losses) on sale of available for sale securities ​ $ 3,525 ​ $ 201 ​ $ (7,921) Net securities gains (losses) Amortization of defined benefit pension plan and defined benefit plan component of the SERP: ​ ​ ​ ​ ​ Prior service credit ​ ​ 77 ​ 77 ​ 77 Other operating expenses Transition obligation ​ ​ — ​ — ​ (5) Other operating expenses Actuarial losses ​ ​ (658) ​ (564) ​ (456) Other operating expenses Realized (losses) gains on cash flow hedges ​ ​ (1,651) ​ 1,588 ​ 1,068 Interest expense Realized loss on the termination of swaps ​ ​ (3,365) ​ ​ — ​ ​ — ​ Loss on termination of swaps Total reclassifications, before income tax ​ ​ (2,072) ​ ​ 1,302 ​ ​ (7,237) ​ Income tax benefit (expense) ​ ​ 606 ​ (380) ​ 2,105 Income tax expense Total reclassifications, net of income tax ​ $ (1,466) ​ $ 922 ​ $ (5,132) ​ ​

QUARTERLY FINANCIAL DATA (UNAUD

QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2020
QUARTERLY FINANCIAL DATA (UNAUDITED)
QUARTERLY FINANCIAL DATA (UNAUDITED)	21. QUARTERLY FINANCIAL DATA (UNAUDITED) Selected Consolidated Quarterly Financial Data follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 Quarter Ended (In thousands, except per share amounts) March 31, June 30, September 30, December 31, Interest income ​ $ 44,602 ​ $ 45,850 ​ $ 46,296 ​ $ 47,484 Interest expense ​ 7,952 ​ 5,418 ​ 5,589 ​ 4,492 Net interest income ​ ​ 36,650 ​ 40,432 ​ 40,707 ​ 42,992 Provision for credit losses ​ ​ 5,000 ​ 4,500 ​ 1,500 ​ 500 ​ Net interest income after provision for credit losses ​ ​ 31,650 ​ 35,932 ​ 39,207 ​ 42,492 Non-interest income ​ ​ 5,217 ​ 2,252 ​ ​ 6,790 ​ 5,444 Non-interest expense ​ ​ 24,843 ​ 24,399 ​ ​ 28,937 (1) 35,078 (2) Income before income taxes ​ ​ 12,024 ​ 13,785 ​ 17,060 ​ 12,858 Income tax expense ​ ​ 2,676 ​ 3,129 ​ 3,999 ​ 3,881 ​ Net income ​ $ 9,348 $ 10,656 $ 13,061 $ 8,977 Basic earnings per share ​ $ 0.47 $ 0.54 $ 0.66 $ 0.45 Diluted earnings per share ​ $ 0.47 $ 0.54 $ 0.66 $ 0.45 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 Quarter Ended (In thousands, except per share amounts) March 31, June 30, September 30, December 31, Interest income ​ $ 44,515 ​ $ 46,352 ​ $ 46,354 ​ $ 44,320 Interest expense ​ 10,192 ​ 10,835 ​ 9,639 ​ 8,672 Net interest income ​ ​ 34,323 ​ 35,517 ​ 36,715 ​ 35,648 Provision for loan losses ​ ​ 600 ​ 3,500 ​ 1,000 ​ 600 ​ Net interest income after provision for loan losses ​ ​ 33,723 ​ 32,017 ​ 35,715 ​ 35,048 Non-interest income ​ ​ 5,218 ​ 5,499 ​ ​ 6,244 ​ 8,426 Non-interest expense ​ ​ 22,599 ​ 24,004 ​ ​ 24,204 ​ 25,332 ​ Income before income taxes ​ ​ 16,342 ​ 13,512 ​ 17,755 ​ 18,142 Income tax expense ​ ​ 3,415 ​ 2,859 ​ 3,852 ​ 3,934 ​ Net income ​ $ 12,927 $ 10,653 $ 13,903 $ 14,208 Basic earnings per share ​ $ 0.65 $ 0.53 $ 0.70 $ 0.71 Diluted earnings per share ​ $ 0.65 $ 0.53 $ 0.70 $ 0.71 (1) 2020 amount includes pre-tax merger expenses of $2.4 million. (2) 2020 amount includes pre-tax merger expenses of $2.1 million.

NET FRAUD LOSS

NET FRAUD LOSS	12 Months Ended
	Dec. 31, 2020
NET FRAUD LOSS
NET FRAUD LOSS	22. NET FRAUD LOSS The Company incurred a pre-tax charge of $8.9 million in the year ended December 31, 2018 relating to the fraudulent conduct of a business customer through its deposit accounts at the Bank. The Company continues to work with the appropriate law enforcement authorities in connection with this matter. The customer has filed a petition pursuant to Chapter 11 of the bankruptcy code. In September 2020, the Company resolved its claim for the loss with its insurance carrier to the full extent of the available coverage. ​

SUBSEQUENT EVENT

SUBSEQUENT EVENT	12 Months Ended
	Dec. 31, 2020
SUBSEQUENT EVENT.
SUBSEQUENT EVENT	23. SUBSEQUENT EVENT Merger Agreement with Dime Community Bancshares, Inc. On July 1, 2020, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Legacy Dime. Pursuant to the Merger Agreement, on February 1, 2021, Legacy Dime merged with and into Bridge, with Bridge as the surviving corporation under the name “Dime Community Bancshares, Inc.” At the Effective Time, each outstanding share of Legacy Dime common stock, par value $0.01 per share, was converted into the right to receive 0.6480 shares of the Company’s common stock, par value $0.01 per share. The Company issued 21,232,920 shares of its common stock to Legacy Dime shareholders in connection with the Merger. At the Effective Time, each outstanding share of Legacy Dime’s Series A preferred stock, par value $0.01 (the “Dime Preferred Stock”) was converted into the right to receive one share of a newly created series of Company preferred stock having the same powers, preferences and rights as the Dime Preferred Stock. The Company issued 5,299,200 shares of its 5.50% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series A to Dime Preferred Stock holders in connection with the Merger. Immediately following the Merger, Dime Community Bank, a New York-chartered commercial bank and a wholly-owned subsidiary of Legacy Dime, merged with and into BNB Bank, a New York-chartered commercial bank and a wholly-owned subsidiary of the Company, with BNB Bank as the surviving bank, under the name “Dime Community Bank.” In connection with the Merger, the Company assumed $115.0 million in aggregate principal amount of 4.50% Fixed-to-Floating Rate Subordinated Debentures due 2027 of Legacy Dime.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2020
BASIS OF PRESENTATION.
Nature of Operations and Principles of Consolidation	Nature of Operations and Principles of Consolidation On February 1, 2021, Dime Community Bancshares, Inc., (“Legacy Dime”) merged with and into Bridge Bancorp, Inc., (“Legacy Bridge”) (the “Merger”), with Legacy Bridge as the surviving corporation under the name “Dime Community Bancshares, Inc.” (the “Holding Company”). The consolidated financial statements include the Holding Company, which was known as “Bridge Bancorp, Inc.” prior to the Merger, a bank holding company incorporated under the laws of the State of New York, engaged in commercial banking and financial services through its wholly-owned subsidiary, Dime Community Bank, (the “Bank”), which was known as “BNB Bank” prior to the Merger, together referred to as the “Company.” The Bank’s operations include its real estate investment trust subsidiary, Bridgehampton Community, Inc.; a financial title insurance subsidiary, Bridge Abstract LLC (“Bridge Abstract”); and an investment services subsidiary, Bridge Financial Services, Inc. (“Bridge Financial Services”). Intercompany transactions and balances are eliminated in consolidation. The Company’s consolidated financial statements, including notes thereto, and accounting policies and practices are as of December 31, 2020, and do not include the operations of Legacy Dime. The Company provides financial services through its branches in its primary market areas of Suffolk and Nassau Counties on Long Island and the New York City boroughs. The Bank’s primary deposit products are time, savings and demand deposits from the consumers, businesses and local municipalities in its market area. Its primary lending products are commercial real estate, multi-family, commercial and industrial, and residential mortgage loans. There are no significant concentrations of loans to any one industry or customer. However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area. The audited consolidated financial statements presented in this Annual Report on Form 10-K include the collective results of the Holding Company and its wholly-owned subsidiary, the Bank, which are collectively herein referred to as “we”, “us”, “our” and the “Company.” The financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and general practices within the financial institution industry. The following is a description of the significant accounting policies that the Company follows in preparing its consolidated financial statements.
Use of Estimates	Use of Estimates The preparation of financial statements, in conformity with U.S. GAAP, requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the consolidated financial statements and the disclosures provided, and actual future results could differ.
COVID-19 Risks	COVID-19 Risks In December 2019, a novel coronavirus (“COVID-19”) was reported in China, and, in March 2020, the World Health Organization declared COVID-19 a pandemic. On March 12, 2020, the President of the United States declared the COVID-19 outbreak in the United States a national emergency. The Company’s audited consolidated financial statements reflect the impact of COVID-19 on the assumptions and estimates used. Given the ongoing and dynamic nature of the circumstances, it is difficult to predict the full impact of the COVID-19 outbreak on the Company’s business. The extent of such impact will depend on future developments, which are highly uncertain, including when COVID-19 can be controlled and abated and when and how the economy may be reopened. As the result of the COVID-19 pandemic and the related adverse local and national economic consequences, the Company is subject to the following risks, any of which could have a material, adverse effect on its business, financial condition, liquidity, and results of operations: ● demand for the Company’s products and services may decline, making it difficult to grow assets and income; ● if the economy is unable to substantially reopen or remain open, and high levels of unemployment continue, for an extended period of time, loan delinquencies, problem assets, and foreclosures may increase, resulting in increased charges and reduced income; ● collateral for loans, especially real estate, may decline in value, which could cause loan losses to increase; ● the Company’s allowance for credit losses (“ACL”) may have to be increased if borrowers experience financial difficulties beyond forbearance periods, which will adversely affect the Company’s net income; ● the Company may recognize impairment of its goodwill; ● the net worth and liquidity of loan guarantors may decline, impairing their ability to honor commitments to the Company; ● as the result of the decline in the Federal Reserve Board’s target federal funds rate to near 0%, the yield on the Company’s assets may decline to a greater extent than the decline in its cost of interest-bearing liabilities, reducing net interest margin and spread and reducing net income; ● a material decrease in net income or a net loss over several quarters could result in a decrease in the rate of the Company’s quarterly cash dividend; ● the Company’s cyber security risks are increased as the result of an increase in the number of employees working remotely; and ● the Company relies on third party vendors for certain services and the unavailability of a critical service due to the COVID-19 outbreak could have an adverse effect on the Company.
Cash Flows	Cash Flows For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, interest- earning deposits with banks, and federal funds sold, which mature overnight. Net cash flows are reported for customer loan and deposit transactions, federal funds purchased, FHLB advances, and repurchase agreements.
Securities	Securities Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available for sale when they might be sold before maturity. Securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax. Equity securities are carried at fair value, with changes in fair value reported in net income. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting in observable price changes in orderly transactions for the identical or a similar investment. Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. The Company has made a policy election to exclude accrued interest from the amortized cost basis of debt securities and report accrued interest separately in accrued interest receivable in the consolidated balance sheet. A debt security is placed on non-accrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on non-accrual is reversed against interest income. There were no non-accrual debt securities at December 31, 2020 and there was no accrued interest related to debt securities reversed against interest income for the year ended December 31, 2020. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. On January 1, 2020, the Company adopted the CECL Standard, which requires that debt securities held to maturity be accounted for under the current expected credit losses model, including historical loss experience and impact of current conditions and reasonable and supportable forecasts, with an associated allowance for credit losses. In addition, while credit losses on debt securities available for sale should be measured in accordance with the other-than-temporary impairment (“OTTI”) framework under current GAAP, the amendments in the CECL Standard require that these credit losses be presented as an allowance for credit losses. For AFS debt securities, a decline in fair value due to credit loss results in recording an allowance for credit losses to the extent the fair value is less than the amortized cost basis.
Held to maturity debt securities and the allowance for credit losses	Held to maturity debt securities and the allowance for credit losses To the extent that debt securities in the held-to-maturity portfolio share common risk characteristics, estimated expected credit losses are calculated in a manner like that used for loans held for investment. That is, for pools of such debt securities with common risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities. Expected credit loss on each debt security in the held-to-maturity portfolio that do not share common risk characteristics with any of the pools of debt securities is individually measured based on net realizable value, or the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the recorded amortized cost basis of the security. With respect to certain classes of debt securities, primarily U.S. Treasuries and securities issued by Government Sponsored Entities, the Company considers the history of credit losses, current conditions and reasonable and supportable forecasts, which may indicate that the expectation that nonpayment of the amortized cost basis is or continues to be zero, even if the U.S. government were to technically default. Therefore, for those securities, the Company does not record expected credit losses. Accrued interest receivable is excluded from the estimate of credit losses.
Available for sale debt securities and the allowance for credit losses	Available for sale debt securities and the allowance for credit losses Management evaluates available for sale debt securities for OTTI on at least a quarterly basis, and more frequently when economic or market conditions warrant such evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the near-term prospects of the issuer. Impairment may result from credit deterioration of the issuer or collateral underlying the security. In performing an assessment of whether any decline in fair value is due to a credit loss, all relevant information is considered at the individual security level. For asset-backed securities performance indicators considered related to the underlying assets include default rates, delinquency rates, percentage of non-performing assets, debt-to-collateral ratios, third party guarantees, current levels of subordination, vintage, geographic concentration, analyst reports and forecasts, credit ratings and other market data. In assessing whether a credit loss exists, we compare the present value of cash flows expected to be collected from the security with 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 for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount the fair value is less than amortized cost basis. Declines in fair value that have not been recorded through an allowance for credit losses, such as declines due to changes in market interest rates, are excluded from earnings and reported, net of tax, in other comprehensive income (“OCI”). Management also assesses whether it intends to sell or is more likely than not that it will be required to sell a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. Accrued interest receivable is excluded from the estimate of credit losses.
Securities, Restricted	Securities, Restricted Securities, restricted represents FHLB, Federal Reserve Bank (“FRB”) and bankers’ banks stock, which are reported at cost. The Bank is a member of the FHLB system. Members are required to own a particular amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Loans Held for Sale	Loans Held for Sale Loans held for sale are carried at the lower of aggregate cost or estimated fair value. Any subsequent declines in fair value below the initial carrying value are recorded as a valuation allowance, which is established through a charge to earnings.
Loans	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of partial charge-offs, deferred origination costs and fees and purchase premiums and discounts. Loan origination and commitment fees and certain direct and indirect costs incurred in connection with loan originations are deferred and amortized to income over the life of the related loans as an adjustment to yield. When a loan prepays, the remaining unamortized net deferred origination fees or costs are recognized in the current year. Interest on loans is credited to income based on the principal outstanding during the period. The Company has made a policy election to exclude accrued interest from the amortized cost basis of loans and report accrued interest separately from the related loan balance in accrued interest receivable on consolidated balance sheets. Past due status is based on the contractual terms of the loan. Loans that are 90 days past due are automatically placed on non-accrual and previously accrued interest is reversed and charged against interest income. However, if the loan is in the process of collection and the Bank has reasonable assurance that the loan will be fully collectable based upon an individual loan evaluation assessing such factors as collateral and collectability, accrued interest will be recognized as earned. If a payment is received when a loan is non-accrual or a troubled debt restructuring (“TDR”) loan is non-accrual, the payment is applied to the principal balance. A TDR loan performing in accordance with its modified terms is maintained on accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Loans that were acquired through the acquisition of Community National Bank on June 19, 2015 and First National Bank of New York on February 14, 2014 were initially recorded at fair value with no carryover of the related allowance for loan losses. After acquisition, losses are recognized through the allowance for loan losses. Determining fair value of the loans involves estimating the amount and timing of expected principal and interest cash flows to be collected on the loans and discounting those cash flows at a market interest rate. Some of the loans at the time of acquisition showed evidence of credit deterioration since origination. These loans were considered purchased credit impaired (“PCI”) loans. As of December 31, 2019, the remaining balance of PCI loans was immaterial to the Company’s financial condition and results of operations. Unless otherwise noted, the above policy is applied consistently to all loan segments.
Allowance for Credit Losses	Allowance for Credit Losses On January 1, 2020, we adopted the CECL Standard, which requires that loans held for investment be accounted for under the current expected credit losses model. Although the CARES Act provided the option to delay the adoption of the current expected credit loss model until the earlier of December 31, 2020 or the termination of the current national emergency declaration related to the COVID-19 outbreak, we implemented the CECL Standard in the first quarter of 2020 as previously planned. The allowance for credit losses is established and maintained through a provision for credit losses based on expected losses inherent in our loan portfolio. Management evaluates the adequacy of the allowance on a quarterly basis. Management monitors its entire loan portfolio regularly, with consideration given to detailed analysis of classified loans, repayment patterns, past loss experience, various types of concentrations of credit, current economic conditions, and reasonable and supportable forecasts. Additions to the allowance are charged to expense and realized losses, net of recoveries, are charged against the allowance. The credit loss estimation process involves procedures to appropriately consider the unique characteristics of our loan portfolio segments. These segments are further disaggregated into loan risk ratings, the level at which credit risk is monitored. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on expected loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and provision for credit losses in those future periods. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in our process for estimation of expected credit losses. The allowance level is influenced by loan volumes, loan risk rating migration, historic loss experience and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: (1) an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and (2) a pooled component for estimated expected credit losses for pools of loans that share similar risk characteristics.
Loans that do not share similar credit risk characteristics	Loans that do not share similar credit risk characteristics For a loan that does not share risk characteristics with other loans, expected credit loss is measured based on net realizable value, that is, the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the amortized cost basis of the loan. For these loans, the Company recognizes expected credit loss equal to the amount by which the net realizable value of the loan is less than the amortized cost basis of the loan (which is net of previous charge-offs), except when the loan is collateral dependent, that is, when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. In these cases, expected credit loss is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral. The fair value of the collateral is adjusted for the estimated costs to sell the loan if repayment or satisfaction of a loan is dependent on the sale (rather than only on the operation) of the collateral. The fair value of real estate collateral is determined based on recent appraised values. Appraisals are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. All appraisals undergo a second review process to ensure that the methodology employed and the values derived are reasonable. Generally, collateral values for real estate loans for which measurement of expected losses is dependent on collateral values are updated every twelve months. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation and management’s expertise and knowledge of the borrower and its business. Once the expected credit loss amount is determined, an allowance is provided for equal to the calculated expected credit loss and included in the allowance for credit losses. Pursuant to the Company’s policy, credit losses must be charged-off in the period the loans, or portions thereof, are deemed uncollectable.
Loans that share similar credit risk characteristics	Loans that share similar credit risk characteristics In estimating the component of the allowance for credit losses for loans that share similar risk characteristics with other loans, such loans are segmented into loan types. Loans are designated into loan pools with similar risk characteristics based on product type in conjunction with other homogeneous characteristics. Loan types include commercial real estate mortgages, owner and non-owner occupied; multi-family mortgage loans; residential real estate mortgages and home equity loans; commercial, industrial and agricultural loans, real estate construction and land loans; and consumer loans. In determining the allowance for credit losses, the Company derives an estimated credit loss assumption from a model that categorizes loan pools based on loan type and further segmented by risk rating. This model is known as Probability of Default/Loss Given Default, utilizing a Transition Matrix approach. This model calculates an expected loss percentage for each loan pool by considering the probability of default, based upon the historical transition or migration of loans from performing (various pass ratings) to criticized, and classified risk ratings to default by risk rating buckets using life-of-loan analysis runout periods for all loan segments, and the historical severity of loss, based on the aggregate net lifetime losses (loss given default) per loan pool. The default trigger, which is defined as the earlier of ninety days past-due or non-accrual status, and severity factors used to calculate the allowance for credit losses for loans in pools that share similar risk characteristics with other loans, are adjusted for differences between the historical period used to calculate historical default and loss severity rates and expected conditions over the remaining lives of the loans in the portfolio. These factors include: (1) lending policies and procedures; (2) international, national, regional and local economic business conditions and developments that affect the collectability of the portfolio, including the condition of various markets; (3) the nature and volume of the loan portfolio including the terms of the loans; (4) the experience, ability, and depth of the lending management and other relevant staff; (5) the volume and severity of past due and adversely classified or graded loans and the volume of non-accrual loans; (6) the quality of our loan review system; (7) the value of underlying collateral for collateralized loans; (8) the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and (9) the effect of external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio. Such factors are used to adjust the historical probabilities of default and severity of loss for current conditions that are not reflective of the model results. In addition, the economic factor includes management’s expectation of future conditions based on a reasonable and supportable forecast of the economy. To the extent the lives of the loans in the portfolio extend beyond the period for which a reasonable and supportable forecast can be made (currently two years), the Bank reverts immediately back to the historical rates of default and severity of loss. Management believes that this transition approach to the Probability of Default/Loss Given Default is a relevant calculation of expected credit losses as there is sufficient volume as well as movement in the risk ratings due to the initial grading system as well as timely updates to risk ratings when necessary. Credit risk ratings are based on management’s evaluation of a credit’s cash flow, collateral, guarantor support, financial disclosures, industry trends and strength of borrowers’ management. Future additions or reductions to the allowance may be necessary based on changes in economic, market or other conditions. Changes in estimates could result in a material change in the allowance. In addition, various regulatory agencies, as an integral part of the examination process, periodically review the allowance for credit losses. Such agencies may require the Bank to recognize adjustments to the allowance based on their judgments of the information available to them at the time of their examination. A loan is considered a potential charge-off when it is in default of either principal or interest for a period of 90, 120 or 180 days, depending upon the loan type, as of the end of the prior month. In addition to delinquency criteria, other triggering events may include, but are not limited to, notice of bankruptcy by the borrower or guarantor, death of the borrower, and deficiency balance from the sale of collateral. Unless otherwise noted, the above policy is applied consistently to all loan portfolio segments.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments Financial instruments include off-balance sheet credit instruments, such as unused lines of credit, commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded on the balance sheet when they are funded. In accordance with the CECL Standard, the Company maintains a separate reserve for off-balance sheet credit instruments, which is included in other liabilities on the consolidated statements of financial condition. Management estimates the amount of expected losses by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by the Company and applying the loss factors, current conditions and forecasting adjustments used in the allowance for credit loss methodology to the results of the usage calculation to estimate the liability for credit losses related to unfunded commitments for each loan type. No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by the Company. At December 31, 2020, the reserve for off-balance sheet credit exposures was immaterial to the Company’s consolidated statements of financial condition and results of operations.
Premises and Equipment	Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation. Buildings and related components are depreciated using the straight-line method with a useful life of fifty years for buildings and a range of two Improvements and major repairs are capitalized, while the cost of ordinary maintenance, repairs and minor improvements are charged to expense.
Bank-Owned Life Insurance	Bank-Owned Life Insurance The Bank is the owner and beneficiary of life insurance policies on certain employees. Bank-owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Other Real Estate Owned	Other Real Estate Owned Real estate properties acquired through, or in lieu of, foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at the lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed.
Goodwill and other Intangible Assets	Goodwill and Other Intangible Assets Goodwill resulting from business combinations is generally determined as the excess of the fair value of the consideration transferred over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and indefinite-lived intangible assets are not amortized, but tested for impairment at least annually, or more frequently if events and circumstances exist that indicate the carrying amount of the asset may be impaired. The Company has selected November 30 as the date to perform the annual impairment test. Goodwill and the BNB Bank Other intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible assets are amortized on an accelerated method over their estimated useful lives of ten years. Other intangible assets also include servicing rights, which result from the sale of SBA loans with servicing rights retained. Servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Servicing assets are subsequently measured using the amortization method, which requires servicing rights to be amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans.
Derivatives	Derivatives The Company records cash flow hedges at the inception of the derivative contract based on the Company’s intentions and belief as to likely effectiveness as a hedge. Cash flow hedges represent a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income (“OCI”) and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. The changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as non-interest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in non-interest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods in which the hedged transactions will affect earnings.
Income Taxes	Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. It is management’s position, as currently supported by the facts and circumstances, that no valuation allowance is necessary against any of the Company’s deferred tax assets at December 31, 2020. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. There are no such tax positions in the Company’s financial statements at December 31, 2020 and 2019. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. The Company did not have any amounts accrued for interest and penalties at December 31, 2020 and 2019.
Treasury Stock	Treasury Stock Repurchases of common stock are recorded as treasury stock at cost. Treasury stock is reissued using the first in, first out method.
Earnings Per Share ("EPS")	Earnings Per Share (“EPS”) Basic EPS is net income attributable to common shareholders divided by the weighted average number of common shares outstanding during the period. All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation. Diluted EPS includes the dilutive effect of additional potential common shares issuable under stock options.
Dividend Restriction	Dividend Restriction Cash available for distribution of dividends to stockholders of the Company is primarily derived from cash and cash equivalents of the Company and dividends paid by the Bank to the Company. Prior regulatory approval is required if the total of all dividends declared by the Bank in any calendar year exceeds the total of the Bank’s net income of that year combined with its retained net income of the preceding two years. Dividends from the Bank to the Company at January 1, 2021 are limited to $49.8 million, which represents the Bank’s net retained earnings from the previous two years. During 2020, the Bank paid $26.5 million in cash dividends to the Company.
Segment Reporting	Segment Reporting While management monitors the revenue streams of the various products and services, the identifiable segments are not material and operations are managed and financial performance is evaluated on a Company-wide basis. Accordingly, all of the financial service operations are considered by management to be aggregated in one reportable operating segment.
Stock-Based Compensation	Stock-Based Compensation Compensation cost is recognized for stock options, restricted stock awards (“RSAs”), and restricted stock units (“RSUs”) issued to employees and independent directors, based on the fair value of these awards at the date of the grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used to estimate the fair value for RSAs and RSUs. Compensation cost is recognized as expense over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. The Company’s accounting policy is to recognize forfeitures as they occur.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on available for sale securities, unrealized gains and losses on cash flow hedges, and changes in the funded status of the pension plan, which are also recognized as separate components of equity.
Reclassifications	Reclassifications Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
Standards Effective in 2020	Standards Effective in 2020 ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) Effective for periods after December 31, 2019, the Company adopted Accounting Standards Update (“ASU”) No 2016-13, Financial Instruments – Credit Losses (Topic 326), which replaced the long-standing incurred loss model used in calculating the allowance for loan and lease losses with a more forward-looking, current expected credit loss model (“CECL” or the “CECL Standard”). Furthermore, the CECL Standard requires financial institutions to measure all expected credit losses for in-scope financial assets held at amortized cost at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts, including estimates of prepayments. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with Topic 842 on leases. Accordingly, financial institutions will now leverage forward-looking information to better inform their credit loss estimates. For the Company, this standard applies to loans held for investment, unfunded commitments, and securities held to maturity. In addition, the CECL Standard made changes to the accounting for available for sale debt securities. Credit losses on available for sale debt securities under the CECL Standard should be measured in a manner similar to legacy GAAP. However, the amendments in the CECL Standard require that credit losses be presented as an allowance for credit losses rather than as a write-down. The CECL Standard approach is an improvement because an entity is able to record reversals of credit losses (in situations in which the estimate of credit losses declines) in current period net income, which in turn should align the income statement recognition of credit losses with the reporting period in which changes occur. Although the Coronavirus Aid, Relief, and Economic Security Act (the “CARES” Act) provided the option to delay the adoption of the CECL Standard until the earlier of December 31, 2020 or the termination of the current national emergency declaration related to the COVID-19 outbreak, the Company adopted the CECL Standard in the first quarter of 2020 as previously planned using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. The adoption of the CECL Standard resulted in an initial increase of $1.6 million to the allowance for credit losses and $0.5 million to the reserve for unfunded commitments. The after-tax cumulative-effect adjustment of $1.5 million was recorded in retained earnings as of January 1, 2020. Based on the credit quality of the Company's securities portfolio, there was no initial adjustment to retained earnings for credit losses associated with debt securities held to maturity. Results for reporting periods beginning after January 1, 2020 are presented under the CECL Standard while prior period amounts will continue to be reported in accordance with previously applicable GAAP. ​ ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In January 2017, the FASB amended existing guidance to simplify the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The amendments require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount of the reporting unit exceeds its fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The amendments also eliminate the requirement for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. The amendments are effective for public business entities that are an SEC filer, like the Company, for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The amendments should be applied prospectively. An entity is required to disclose the nature of and reason for the change in accounting principle upon transition in the first annual period when the entity initially adopts the amendments. The adoption of ASU 2017-04 did not have an effect on the Company's consolidated financial statements. ASU 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 In August 2018, the FASB issued ASU 2018-15 to align 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). The amendments in this ASU are effective for public business entities, like the Company, for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments in this ASU is permitted, including adoption in any interim period. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The adoption of ASU 2018-15 did not have a material effect on the Company's consolidated financial statements.

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2020
SECURITIES.
Schedule of amortized cost and fair value of the available for sale and held to maturity	The following table summarizes the amortized cost and estimated fair value of the available for sale and held to maturity investment securities portfolio at December 31, 2020 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) and gross unrecognized gains and losses, respectively: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (In thousands) Cost Gains Losses Value Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 40,448 $ 1,650 ​ $ (10) $ 42,088 U.S. GSE residential mortgage-backed securities ​ 111,398 ​ 1,843 ​ (6) ​ 113,235 U.S. GSE residential collateralized mortgage obligations ​ 127,369 ​ 1,661 ​ (226) ​ 128,804 U.S. GSE commercial mortgage-backed securities ​ 24,920 ​ 140 ​ (253) ​ 24,807 U.S. GSE commercial collateralized mortgage obligations ​ 61,102 ​ 1,286 ​ (52) ​ 62,336 Other asset backed securities ​ 24,250 ​ — ​ (300) ​ 23,950 Corporate bonds ​ 56,500 ​ 195 ​ (1,555) ​ 55,140 Total available for sale ​ 445,987 ​ 6,775 ​ (2,402) ​ 450,360 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Estimated ​ ​ Amortized ​ Unrecognized ​ Unrecognized ​ Fair (In thousands) Cost Gains Losses Value Held to maturity: ​ ​ ​ ​ ​ ​ State and municipal obligations ​ 23,715 ​ 1,406 ​ — ​ 25,121 U.S. GSE residential mortgage-backed securities ​ 6,272 ​ 227 ​ — ​ 6,499 U.S. GSE residential collateralized mortgage obligations ​ 18,511 ​ 489 ​ (9) ​ 18,991 U.S. GSE commercial mortgage-backed securities ​ 13,069 ​ 625 ​ — ​ 13,694 U.S. GSE commercial collateralized mortgage obligations ​ 24,133 ​ 887 ​ — ​ 25,020 Total held to maturity ​ 85,700 ​ 3,634 ​ (9) ​ 89,325 Total securities ​ $ 531,687 ​ $ 10,409 ​ $ (2,411) ​ $ 539,685 ​ As of December 31, 2020, none of the Company’s available for sale debt securities were in an unrealized loss position due to credit and therefore no allowance for credit losses on available for sale debt securities was required. Additionally, the calculated allowance for credit losses on held to maturity securities was inconsequential given the high quality composition of the Company’s held to maturity portfolio and therefore no allowance for credit losses was recorded. Accrued interest receivable on securities totaling $1.4 million at December 31, 2020 was included in accrued interest receivable in the consolidated balance sheet and excluded from the amortized cost and estimated fair value totals in the table above. ​ The following table summarizes the amortized cost and estimated fair value of the available for sale and held to maturity investment securities portfolio at December 31, 2019 and the corresponding amounts of gross unrealized gains and losses therein: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Gross Gross Estimated ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (In thousands) Cost ​ Gains ​ Losses ​ Value Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,833 ​ $ — ​ $ (11) ​ $ 50,822 U.S. GSE securities ​ ​ 5,000 ​ ​ — ​ ​ (5) ​ ​ 4,995 State and municipal obligations ​ 34,303 ​ 704 ​ (43) ​ 34,964 U.S. GSE residential mortgage-backed securities ​ 84,550 ​ 609 ​ (468) ​ 84,691 U.S. GSE residential collateralized mortgage obligations ​ 278,149 ​ 1,166 ​ (1,464) ​ 277,851 U.S. GSE commercial mortgage-backed securities ​ 13,656 ​ 23 ​ (70) ​ 13,609 U.S. GSE commercial collateralized mortgage obligations ​ 102,722 ​ 1,723 ​ (289) ​ 104,156 Other asset-backed securities ​ 24,250 ​ — ​ (849) ​ 23,401 Corporate bonds ​ 46,000 ​ — ​ (2,198) ​ 43,802 Total available for sale ​ 639,463 ​ 4,225 ​ (5,397) ​ 638,291 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ State and municipal obligations ​ 41,008 ​ 809 ​ — ​ 41,817 U.S. GSE residential mortgage-backed securities ​ 8,142 ​ 5 ​ (54) ​ 8,093 U.S. GSE residential collateralized mortgage obligations ​ 39,936 ​ 624 ​ (62) ​ 40,498 U.S. GSE commercial mortgage-backed securities ​ 17,215 ​ 102 ​ (82) ​ 17,235 U.S. GSE commercial collateralized mortgage obligations ​ 27,337 ​ 191 ​ (144) ​ 27,384 Total held to maturity ​ 133,638 ​ 1,731 ​ (342) ​ 135,027 Total securities ​ $ 773,101 ​ $ 5,956 ​ $ (5,739) ​ $ 773,318
Schedule of securities having a continuous unrealized loss position aggregated by a period of time less than or greater than 12 months	The following table summarizes available for sale debt securities with gross unrealized losses for which an allowance for credit losses has not been recorded at December 31, 2020, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ Greater than 12 months ​ ​ Estimated ​ Gross ​ Estimated ​ Gross ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized (In thousands) Value Losses Value Losses Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 5,310 $ (10) ​ $ — $ — U.S. GSE residential mortgage-backed securities ​ — ​ — ​ 152 ​ (6) U.S. GSE residential collateralized mortgage obligations ​ 55,832 ​ (226) ​ — ​ — U.S. GSE commercial mortgage-backed securities ​ 14,994 ​ (253) ​ — ​ — U.S. GSE commercial collateralized mortgage obligations ​ 11,755 ​ (52) ​ — ​ — Other asset backed securities ​ — ​ — ​ 3,450 ​ (300) Corporate bonds ​ 7,927 ​ (73) ​ 29,518 ​ (1,482) Total available for sale ​ $ 95,818 $ (614) ​ $ 33,120 $ (1,788) The following table summarizes securities with gross unrealized losses at December 31, 2019, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ Greater than 12 months ​ ​ Estimated ​ Gross ​ Estimated ​ Gross ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized (In thousands) Value Losses Value Losses Available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,822 ​ $ (11) ​ $ — ​ $ — U.S. GSE securities ​ ​ — ​ ​ — ​ ​ 4,995 ​ ​ (5) State and municipal obligations ​ 4,982 ​ (42) ​ 76 ​ (1) U.S. GSE residential mortgage-backed securities ​ 2,935 ​ (30) ​ 39,617 ​ (438) U.S. GSE residential collateralized mortgage obligations ​ 81,377 ​ (480) ​ 93,403 ​ (984) U.S. GSE commercial mortgage-backed securities ​ 6,648 ​ (70) ​ — ​ — U.S. GSE commercial collateralized mortgage obligations ​ 28,710 ​ (145) ​ 9,614 ​ (144) Other asset-backed securities ​ — ​ — ​ 23,401 ​ (849) Corporate bonds ​ — ​ — ​ 43,802 ​ (2,198) Total available for sale ​ $ 175,474 $ (778) ​ $ 214,908 $ (4,619) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ U.S. GSE residential mortgage-backed securities ​ — ​ — ​ 7,268 ​ (54) U.S. GSE residential collateralized mortgage obligations ​ 6,750 ​ (17) ​ 6,105 ​ (45) U.S. GSE commercial mortgage-backed securities ​ — ​ — ​ 5,034 ​ (82) U.S. GSE commercial collateralized mortgage obligations ​ 13,038 ​ (57) ​ 4,300 ​ (87) Total held to maturity ​ $ 19,788 ​ $ (74) ​ $ 22,707 ​ $ (268)
Schedule of amortized cost, fair value and maturities of the available for sale and held to maturity investment securities portfolio	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Amortized ​ Estimated (In thousands) Cost Fair Value Maturity ​ ​ ​ ​ ​ ​ Available for sale: ​ ​ ​ ​ ​ ​ Within one year $ 4,131 $ 4,116 One to five years ​ ​ 58,608 ​ ​ 58,861 Five to ten years ​ ​ 38,415 ​ ​ 38,597 Beyond ten years ​ ​ 344,833 ​ ​ 348,786 Total $ 445,987 $ 450,360 ​ ​ ​ ​ ​ ​ ​ Held to maturity: ​ ​ ​ ​ ​ ​ Within one year $ 1,885 $ 1,902 One to five years ​ ​ 23,140 ​ ​ 24,452 Five to ten years ​ ​ 11,535 ​ ​ 12,144 Beyond ten years ​ ​ 49,140 ​ ​ 50,827 Total $ 85,700 $ 89,325

FAIR VALUE (Tables)

FAIR VALUE (Tables)	12 Months Ended
	Dec. 31, 2020
FAIR VALUE.
Schedule of assets and liabilities measured on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Financial assets: ​ ​ ​ ​ ​ ​ ​ Available for sale securities: ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 42,088 ​ ​ $ 42,088 ​ U.S. GSE residential mortgage-backed securities ​ 113,235 ​ ​ 113,235 ​ U.S. GSE residential collateralized mortgage obligations ​ 128,804 ​ ​ 128,804 ​ U.S. GSE commercial mortgage-backed securities ​ 24,807 ​ ​ 24,807 ​ U.S. GSE commercial collateralized mortgage obligations ​ 62,336 ​ ​ 62,336 ​ Other asset-backed securities ​ 23,950 ​ ​ 23,950 ​ Corporate bonds ​ 55,140 ​ ​ 55,140 ​ Total available for sale securities ​ $ 450,360 ​ ​ ​ $ 450,360 ​ Derivatives ​ $ 49,662 ​ ​ ​ $ 49,662 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Derivatives ​ $ 56,417 ​ ​ ​ $ 56,417 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 50,822 ​ ​ ​ $ 50,822 ​ ​ U.S. GSE securities ​ ​ 4,995 ​ ​ ​ ​ 4,995 ​ State and municipal obligations ​ 34,964 ​ ​ 34,964 ​ U.S. GSE residential mortgage-backed securities ​ 84,691 ​ ​ 84,691 ​ U.S. GSE residential collateralized mortgage obligations ​ 277,851 ​ ​ 277,851 ​ U.S. GSE commercial mortgage-backed securities ​ 13,609 ​ ​ 13,609 ​ U.S. GSE commercial collateralized mortgage obligations ​ 104,156 ​ ​ 104,156 ​ Other asset-backed securities ​ 23,401 ​ ​ 23,401 ​ Corporate bonds ​ 43,802 ​ ​ 43,802 ​ Total available for sale securities ​ $ 638,291 ​ ​ ​ $ 638,291 ​ Derivatives ​ $ 15,437 ​ ​ ​ $ 15,437 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Derivatives ​ $ 16,645 ​ ​ ​ $ 16,645 ​
Schedule of assets measured at fair value on a non-recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ Assets ​ Inputs ​ Inputs (In thousands) Value (Level 1) (Level 2) (Level 3) Loans held for sale ​ $ 52,785 $ 42,785 ​ ​ $ 10,000 Individually evaluated loans ​ $ 2,940 ​ ​ ​ $ 2,940 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ Markets for ​ Other ​ Significant ​ ​ ​ ​ ​ Identical ​ Observable ​ Unobservable ​ ​ Carrying ​ ​ Assets ​ Inputs ​ Inputs (In thousands) Value ​ (Level 1) (Level 2) (Level 3) Loans held for sale ​ $ 12,643 ​ ​ ​ ​ $ 12,643 Impaired loans ​ $ 6,981 ​ ​ $ 6,981
Schedule of estimated fair values and recorded carrying values of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ ​ ​ ​ Quoted Prices In Other Significant ​ ​ ​ Active Markets for Observable Unobservable ​ ​ ​ ​ Carrying Identical Assets Inputs Inputs ​ Total (In thousands) Amount (Level 1) (Level 2) (Level 3) Fair Value Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks $ 107,729 $ 107,729 $ — $ — $ 107,729 Interest-bearing deposits with banks ​ 769,099 ​ 769,099 ​ — ​ — ​ 769,099 Securities available for sale ​ 450,360 ​ — ​ 450,360 ​ — ​ 450,360 Securities restricted ​ 23,362 ​ n/a ​ n/a ​ n/a ​ n/a Securities held to maturity ​ 85,700 ​ — ​ 89,325 ​ — ​ 89,325 Loans held for sale ​ ​ 52,785 ​ ​ 42,785 ​ ​ — ​ ​ 10,000 ​ ​ 52,785 Loans, net ​ 4,553,203 ​ — ​ — ​ 4,554,333 ​ 4,554,333 Derivatives ​ 49,662 ​ — ​ 49,662 ​ — ​ 49,662 Accrued interest receivable ​ 16,566 ​ — ​ 1,421 ​ 15,145 ​ 16,566 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of deposit ​ 288,445 ​ — ​ 290,971 ​ — ​ 290,971 Demand and other deposits ​ 5,200,808 ​ 5,200,808 ​ — ​ — ​ 5,200,808 FHLB advances ​ 215,000 ​ — ​ 221,665 ​ — ​ 221,665 Repurchase agreements ​ 1,223 ​ — ​ 1,223 ​ — ​ 1,223 Subordinated debentures ​ 79,059 ​ — ​ 86,704 ​ — ​ 86,704 Derivatives ​ 56,417 ​ — ​ 56,417 ​ — ​ 56,417 Accrued interest payable ​ 881 ​ — ​ 881 ​ — ​ 881 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ ​ ​ ​ ​ Quoted Prices In Other Significant ​ ​ ​ ​ Active Markets for Observable Unobservable ​ ​ ​ ​ Carrying Identical Assets Inputs Inputs ​ Total (In thousands) Amount (Level 1) (Level 2) (Level 3) Fair Value Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks $ 77,693 $ 77,693 $ — $ — $ 77,693 Interest-bearing deposits with banks ​ 39,501 ​ 39,501 ​ — ​ — ​ 39,501 Securities available for sale ​ 638,291 ​ — ​ 638,291 ​ — ​ 638,291 Securities restricted ​ 32,879 ​ n/a ​ n/a ​ n/a ​ n/a Securities held to maturity ​ 133,638 ​ — ​ 135,027 ​ — ​ 135,027 Loans held for sale ​ ​ 12,643 ​ ​ — ​ ​ — ​ ​ 12,643 ​ ​ 12,643 Loans, net ​ 3,647,499 ​ — ​ — ​ 3,685,770 ​ 3,685,770 Derivatives ​ 15,437 ​ — ​ 15,437 ​ — ​ 15,437 Accrued interest receivable ​ 10,908 ​ — ​ 2,181 ​ 8,727 ​ 10,908 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of deposit ​ 307,977 ​ — ​ 308,660 ​ — ​ 308,660 Demand and other deposits ​ 3,506,670 ​ 3,506,670 ​ — ​ — ​ 3,506,670 FHLB advances ​ 435,000 ​ 195,000 ​ 239,622 ​ — ​ 434,622 Repurchase agreements ​ 999 ​ — ​ 999 ​ — ​ 999 Subordinated debentures ​ 78,920 ​ — ​ 81,010 ​ — ​ 81,010 Derivatives ​ 16,645 ​ — ​ 16,645 ​ — ​ 16,645 Accrued interest payable ​ 1,467 ​ — ​ 1,467 ​ — ​ 1,467

LOANS (Tables)

LOANS (Tables)	12 Months Ended
	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Schedule of the major classifications of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (In thousands) December 31, 2020 December 31, 2019 Commercial real estate mortgage loans: ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 557,076 ​ $ 531,088 Non-owner occupied ​ ​ 1,081,443 ​ ​ 1,034,599 Multi-family mortgage loans ​ ​ 899,730 ​ 812,174 Residential real estate mortgage loans ​ 434,689 ​ 493,144 Commercial, industrial and agricultural loans ​ 1,527,147 ​ 679,444 Real estate construction and land loans ​ 82,479 ​ 97,311 Installment/consumer loans ​ 23,019 ​ 24,836 Total loans ​ 4,605,583 ​ 3,672,596 Net deferred loan (fees) costs ​ (8,180) ​ 7,689 Total loans held for investment ​ 4,597,403 ​ 3,680,285 Allowance for credit losses ​ (44,200) ​ (32,786) Loans, net ​ $ 4,553,203 ​ $ 3,647,499
Schedule of loans by class categorized by internally assigned credit risk grades	​ The following tables represent loans categorized by internally assigned risk grades as of December 31, 2020 and December 31, 2019. In the December 31, 2020 table, the years noted represent the year of origination for non-revolving loans. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (In thousands) ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ 2015 and Prior ​ Revolving ​ Revolving-Term ​ Total Commercial real estate owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 92,053 ​ $ 96,679 ​ $ 47,224 ​ $ 66,320 ​ $ 25,852 ​ $ 153,766 ​ $ — ​ $ — ​ $ 481,894 Watch ​ ​ 727 ​ ​ 1,373 ​ ​ 8,038 ​ ​ 10,737 ​ ​ 3,425 ​ ​ 23,919 ​ ​ — ​ ​ — ​ ​ 48,219 Special mention ​ ​ 1,843 ​ ​ — ​ ​ 3,875 ​ ​ 10,857 ​ ​ 823 ​ ​ 4,600 ​ ​ — ​ ​ — ​ ​ 21,998 Substandard ​ ​ 469 ​ ​ 553 ​ ​ — ​ ​ — ​ ​ 2,426 ​ ​ 1,517 ​ ​ — ​ ​ — ​ ​ 4,965 Total commercial real estate owner occupied ​ ​ 95,092 ​ ​ 98,605 ​ ​ 59,137 ​ ​ 87,914 ​ ​ 32,526 ​ ​ 183,802 ​ ​ — ​ ​ — ​ ​ 557,076 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 181,811 ​ ​ 249,782 ​ ​ 108,086 ​ ​ 180,235 ​ ​ 54,252 ​ ​ 214,620 ​ ​ — ​ ​ — ​ ​ 988,786 Watch ​ ​ 7,314 ​ ​ 7,700 ​ ​ 12,845 ​ ​ 12,117 ​ ​ 12,209 ​ ​ 24,089 ​ ​ — ​ ​ — ​ ​ 76,274 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 290 ​ ​ — ​ ​ — ​ ​ 290 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 9,006 ​ ​ 6,038 ​ ​ 1,049 ​ ​ — ​ ​ — ​ ​ 16,093 Total commercial real estate non-owner occupied ​ ​ 189,125 ​ ​ 257,482 ​ ​ 120,931 ​ ​ 201,358 ​ ​ 72,499 ​ ​ 240,048 ​ ​ — ​ ​ — ​ ​ 1,081,443 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multi-family: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 159,301 ​ ​ 293,752 ​ ​ 40,840 ​ ​ 86,169 ​ ​ 118,846 ​ ​ 106,044 ​ ​ — ​ ​ — ​ ​ 804,952 Watch ​ ​ 15,436 ​ ​ 2,724 ​ ​ — ​ ​ 19,331 ​ ​ 35,976 ​ ​ 12,825 ​ ​ — ​ ​ — ​ ​ 86,292 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,098 ​ ​ — ​ ​ 388 ​ ​ — ​ ​ — ​ ​ 8,486 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multi-family ​ ​ 174,737 ​ ​ 296,476 ​ ​ 40,840 ​ ​ 113,598 ​ ​ 154,822 ​ ​ 119,257 ​ ​ — ​ ​ — ​ ​ 899,730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 20,033 ​ ​ 32,564 ​ ​ 71,903 ​ ​ 95,712 ​ ​ 23,589 ​ ​ 106,518 ​ ​ 53,217 ​ ​ 7,012 ​ ​ 410,548 Watch ​ ​ — ​ ​ — ​ ​ 406 ​ ​ 321 ​ ​ 541 ​ ​ 1,740 ​ ​ — ​ ​ 1,145 ​ ​ 4,153 Special mention ​ ​ — ​ ​ 1,103 ​ ​ 758 ​ ​ — ​ ​ — ​ ​ 6,879 ​ ​ 818 ​ ​ 633 ​ ​ 10,191 Substandard ​ ​ — ​ ​ 466 ​ ​ 569 ​ ​ 937 ​ ​ — ​ ​ 6,967 ​ ​ — ​ ​ 858 ​ ​ 9,797 Total residential real estate ​ ​ 20,033 ​ ​ 34,133 ​ ​ 73,636 ​ ​ 96,970 ​ ​ 24,130 ​ ​ 122,104 ​ ​ 54,035 ​ ​ 9,648 ​ ​ 434,689 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 949,257 ​ ​ 62,410 ​ ​ 30,736 ​ ​ 17,646 ​ ​ 12,685 ​ ​ 26,606 ​ ​ 304,781 ​ ​ 5,086 ​ ​ 1,409,207 Watch ​ ​ 8,062 ​ ​ 6,140 ​ ​ 8,265 ​ ​ 1,574 ​ ​ 1,188 ​ ​ 3,048 ​ ​ 40,448 ​ ​ 1,527 ​ ​ 70,252 Special mention ​ ​ 2,914 ​ ​ 838 ​ ​ 572 ​ ​ 1,507 ​ ​ 545 ​ ​ 1,323 ​ ​ 18,984 ​ ​ 2,073 ​ ​ 28,756 Substandard ​ ​ — ​ ​ 905 ​ ​ 1,233 ​ ​ 3,514 ​ ​ 470 ​ ​ 9,660 ​ ​ 200 ​ ​ 2,950 ​ ​ 18,932 Total commercial, industrial and agricultural ​ ​ 960,233 ​ ​ 70,293 ​ ​ 40,806 ​ ​ 24,241 ​ ​ 14,888 ​ ​ 40,637 ​ ​ 364,413 ​ ​ 11,636 ​ ​ 1,527,147 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate construction and land loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 37,684 ​ ​ 20,948 ​ ​ 8,229 ​ ​ 11,308 ​ ​ — ​ ​ 1,701 ​ ​ — ​ ​ — ​ ​ 79,870 Watch ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,150 ​ ​ — ​ ​ 270 ​ ​ — ​ ​ — ​ ​ 1,420 Special mention ​ ​ — ​ ​ — ​ ​ 1,078 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,078 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 111 ​ ​ — ​ ​ — ​ ​ 111 Total real estate construction and land loans ​ ​ 37,684 ​ ​ 20,948 ​ ​ 9,307 ​ ​ 12,458 ​ ​ — ​ ​ 2,082 ​ ​ — ​ ​ — ​ ​ 82,479 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Installment/consumer loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,656 ​ ​ 215 ​ ​ 166 ​ ​ 93 ​ ​ — ​ ​ 710 ​ ​ 17,382 ​ ​ 1,257 ​ ​ 21,479 Watch ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 496 ​ ​ 40 ​ ​ 536 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 46 ​ ​ 46 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 50 ​ ​ 908 ​ ​ 958 Total installment/consumer loans ​ ​ 1,656 ​ ​ 215 ​ ​ 166 ​ ​ 93 ​ ​ — ​ ​ 710 ​ ​ 17,928 ​ ​ 2,251 ​ ​ 23,019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Loans ​ $ 1,478,560 ​ $ 778,152 ​ $ 344,823 ​ $ 536,632 ​ $ 298,865 ​ $ 708,640 ​ $ 436,376 ​ $ 23,535 ​ $ 4,605,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 (In thousands) Pass Special Mention Substandard Doubtful Total Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 511,444 ​ $ 18,426 ​ $ 1,218 ​ $ — ​ $ 531,088 Non-owner occupied ​ 1,022,208 ​ — ​ 12,391 ​ ​ — ​ ​ 1,034,599 Multi-family ​ 811,770 ​ 404 ​ — ​ ​ — ​ ​ 812,174 Residential real estate ​ 475,949 ​ 12,400 ​ 4,795 ​ ​ — ​ ​ 493,144 Commercial, industrial and agricultural ​ 643,413 ​ 15,670 ​ 20,361 ​ ​ — ​ ​ 679,444 Real estate construction and land loans ​ 95,530 ​ — ​ 1,781 ​ ​ — ​ ​ 97,311 Installment/consumer loans ​ 23,976 ​ 103 ​ 757 ​ ​ — ​ ​ 24,836 Total loans ​ $ 3,584,290 ​ $ 47,003 ​ $ 41,303 ​ $ — ​ $ 3,672,596
Schedule of the aging of the recorded investment in past due loans by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ 90+ Days ​ Non-accrual ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-59 ​ 60-89 ​ Past Due ​ Including 90 ​ Total Past ​ ​ ​ ​ ​ ​ ​ ​ Days ​ Days ​ And ​ Days or More ​ Due and ​ ​ ​ ​ ​ ​ (In thousands) Past Due Past Due Accruing Past Due Non-accrual Current Total Loans Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ — ​ $ — ​ $ — ​ $ 636 ​ $ 636 ​ $ 556,440 ​ $ 557,076 Non-owner occupied ​ — ​ — ​ — ​ 6,771 ​ 6,771 ​ 1,074,672 ​ 1,081,443 Multi-family ​ — ​ — ​ — ​ — ​ — ​ 899,730 ​ 899,730 Residential real estate ​ 3,567 ​ 949 ​ — ​ 2,897 ​ 7,413 ​ 427,276 ​ 434,689 Commercial, industrial and agricultural ​ 2,711 ​ 4,072 ​ — ​ 1,597 ​ 8,380 ​ 1,518,767 ​ 1,527,147 Real estate construction and land loans ​ 210 ​ — ​ — ​ 111 ​ 321 ​ 82,158 ​ 82,479 Installment/consumer loans ​ 100 ​ 4 ​ — ​ 150 ​ 254 ​ 22,765 ​ 23,019 Total loans ​ $ 6,588 ​ $ 5,025 ​ $ — ​ $ 12,162 ​ $ 23,775 ​ $ 4,581,808 ​ $ 4,605,583 ​ In the absence of other intervening factors, loans granted payment deferrals related to COVID-19 are not reported as past due or placed on non-accrual status provided the borrowers have met the criteria in the CARES Act or otherwise have met the criteria included in an interagency statement issued by bank regulatory agencies. During the year ended December 31, 2020, there was $93 thousand in interest earned on non-accrual loans and $406 thousand in accrued interest on non-accrual loans was reversed through interest income. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ 90+ Days ​ Non-accrual ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-59 ​ 60-89 ​ Past Due ​ Including 90 ​ Total Past ​ ​ ​ ​ ​ ​ ​ ​ Days ​ Days ​ And ​ Days or More ​ Due and ​ ​ ​ ​ ​ ​ (In thousands) Past Due Past Due Accruing Past Due Non-accrual Current Total Loans Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 917 ​ $ 433 ​ $ — ​ $ 225 ​ $ 1,575 ​ $ 529,513 ​ $ 531,088 Non-owner occupied ​ 98 ​ — ​ — ​ 512 ​ 610 ​ 1,033,989 ​ 1,034,599 Multi-family ​ — ​ — ​ — ​ — ​ — ​ 812,174 ​ 812,174 Residential real estate ​ 3,053 ​ 747 ​ 343 ​ 2,743 ​ 6,886 ​ 486,258 ​ 493,144 Commercial, industrial and agricultural ​ 273 ​ 721 ​ — ​ 736 ​ 1,730 ​ 677,714 ​ 679,444 Real estate construction and land loans ​ — ​ — ​ — ​ 123 ​ 123 ​ 97,188 ​ 97,311 Installment/consumer loans ​ 124 ​ — ​ — ​ 30 ​ 154 ​ 24,682 ​ 24,836 Total loans ​ $ 4,465 ​ $ 1,901 ​ $ 343 ​ $ 4,369 ​ $ 11,078 ​ $ 3,661,518 ​ $ 3,672,596
Schedule of loans receivable by class modified as troubled debt restructurings	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Modifications During the Year Ended December 31, ​ ​ 2020 ​ 2019 ​ 2018 ​ ​ ​ ​ Pre- ​ Post- ​ ​ ​ Pre- ​ Post- ​ ​ ​ Pre- ​ Post- ​ ​ ​ ​ Modification ​ Modification ​ ​ ​ Modification ​ Modification ​ ​ ​ Modification ​ Modification ​ ​ ​ ​ Outstanding ​ Outstanding ​ ​ ​ Outstanding ​ Outstanding ​ ​ ​ Outstanding ​ Outstanding ​ ​ Number of ​ Recorded ​ Recorded ​ Number of ​ Recorded ​ Recorded ​ Number of ​ Recorded ​ Recorded (Dollars in thousands) Loans Investment Investment Loans Investment Investment Loans Investment Investment Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ — $ — $ — 3 $ 8,582 $ 8,582 — $ — $ — Non-owner occupied — — — — — — 1 926 926 Residential real estate ​ — ​ — ​ — 1 ​ 338 ​ 338 1 ​ 644 ​ 644 Commercial, industrial and agricultural 3 ​ 1,138 ​ ​ 1,138 15 ​ 12,828 ​ ​ 12,828 10 ​ 7,649 ​ ​ 7,649 Installment/consumer loans — ​ — ​ ​ — — ​ — ​ ​ — — ​ — ​ ​ — Total 3 $ 1,138 $ 1,138 19 $ 21,748 $ 21,748 12 ​ $ 9,219 ​ $ 9,219
Schedule of individually impaired loans by class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Year Ended December 31, 2019 ​ ​ ​ ​ ​ Unpaid ​ Related ​ Average ​ Interest ​ ​ Recorded ​ Principal ​ Allocated ​ Recorded ​ Income (In thousands) Investment Balance Allowance Investment Recognized With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 3,379 ​ $ 3,401 ​ $ — ​ $ 1,286 ​ $ 41 Non-owner occupied ​ 2,296 ​ 2,296 ​ — ​ 2,149 ​ 99 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ 294 ​ 300 ​ — ​ 74 — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 494 ​ 494 ​ — ​ 287 18 Unsecured ​ ​ 8,863 ​ 8,863 ​ — ​ 6,601 411 Total with no related allowance recorded ​ ​ 15,326 ​ 15,354 ​ — ​ 10,397 ​ 569 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ Owner occupied ​ ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ — — — — — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — ​ — Home equity ​ ​ — ​ — ​ — ​ — ​ — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 9,612 ​ 9,612 ​ 3,435 ​ 6,189 ​ 223 Unsecured ​ ​ 2,045 ​ 2,051 ​ 1,241 ​ 1,838 ​ 86 Total with an allowance recorded ​ ​ 11,657 ​ 11,663 ​ ​ 4,676 ​ 8,027 ​ 309 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ 3,379 ​ 3,401 ​ — ​ 1,286 ​ 41 Non-owner occupied ​ ​ 2,296 ​ 2,296 ​ — ​ 2,149 99 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ 294 ​ 300 ​ — ​ 74 — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 10,106 ​ 10,106 ​ 3,435 ​ 6,476 241 Unsecured ​ ​ 10,908 ​ 10,914 ​ 1,241 ​ 8,439 497 Total ​ $ 26,983 ​ $ 27,017 ​ $ 4,676 ​ $ 18,424 $ 878 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018 ​ Year Ended December 31, 2018 ​ ​ ​ ​ ​ Unpaid ​ Related ​ Average ​ Interest ​ ​ Recorded ​ Principal ​ Allocated ​ Recorded ​ Income (In thousands) Investment Balance Allowance Investment Recognized With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ $ 268 ​ $ 278 ​ $ — ​ $ 177 ​ $ — Non-owner occupied ​ 2,816 ​ 2,816 ​ — 1,583 ​ 88 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ ​ — ​ — — Home equity ​ ​ — ​ — ​ ​ — ​ — — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 8,234 ​ 8,234 ​ ​ — ​ 5,644 196 Unsecured ​ ​ 5,316 ​ 5,316 ​ ​ — ​ 5,127 284 Total with no related allowance recorded ​ ​ 16,634 ​ 16,644 ​ ​ — ​ 12,531 ​ 568 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ — ​ — ​ ​ — ​ — ​ — Non-owner occupied ​ ​ — — ​ — — — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ ​ — ​ — ​ — Home equity ​ ​ — ​ — ​ ​ — ​ — ​ — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 2,721 ​ 2,721 ​ 189 ​ 2,757 ​ 91 Unsecured ​ ​ — ​ — ​ ​ — ​ — ​ — Total with an allowance recorded ​ ​ 2,721 ​ 2,721 ​ ​ 189 ​ 2,757 91 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total: ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ Owner occupied ​ ​ 268 ​ 278 ​ — ​ 177 — Non-owner occupied ​ ​ 2,816 ​ 2,816 ​ — ​ 1,583 88 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgages ​ ​ — ​ — ​ — ​ — — Home equity ​ ​ — ​ — ​ — ​ — — Commercial, industrial and agricultural: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Secured ​ ​ 10,955 ​ 10,955 ​ 189 ​ 8,401 287 Unsecured ​ ​ 5,316 ​ 5,316 ​ — ​ 5,127 284 Total ​ $ 19,355 ​ $ 19,365 ​ $ 189 ​ $ 15,288 $ 659
Schedule of selected information about related party loans	​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, (In thousands) 2020 Balance at beginning of period ​ $ 12,349 New loans ​ ​ 724 Repayments ​ ​ (1,575) Balance at end of period ​ $ 11,498
Schedule of allowance of credit losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance, prior to adoption of CECL ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 Impact of adopting CECL ​ ​ (7,712) ​ ​ (3,589) ​ ​ 2,182 ​ ​ 8,699 ​ ​ 1,274 ​ ​ 771 ​ ​ 1,625 Charge-offs ​ (1) ​ ​ — ​ ​ — ​ ​ (2,004) ​ ​ — ​ ​ (7) ​ ​ (2,012) Recoveries ​ — ​ — ​ 3 ​ 298 ​ — ​ — ​ 301 Provision (credit) for credit losses ​ 4,097 ​ 496 ​ (1,005) ​ 7,787 ​ (165) ​ 290 ​ 11,500 Ending balance ​ $ 8,534 ​ $ 1,736 ​ $ 3,062 ​ $ 27,363 ​ $ 2,175 ​ $ 1,330 ​ $ 44,200 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2019 ​ ​ ​ ​ ​ Residential Commercial, Real Estate ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ $ 10,792 ​ $ 2,566 ​ $ 3,935 ​ $ 12,722 ​ $ 1,297 ​ $ 106 ​ $ 31,418 Charge-offs ​ (3,670) ​ — ​ — ​ (799) ​ — ​ (13) ​ (4,482) Recoveries ​ 1 ​ — ​ 112 ​ 25 ​ — ​ 12 ​ 150 Provision (credit) for credit losses ​ 5,027 ​ 2,263 ​ (2,165) ​ 635 ​ (231) ​ 171 ​ 5,700 Ending balance ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for credit losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ $ 11,048 ​ $ 4,521 ​ $ 2,438 ​ $ 12,838 ​ $ 740 ​ $ 122 ​ $ 31,707 Charge-offs ​ — ​ — ​ (24) ​ (2,806) ​ — ​ (11) ​ (2,841) Recoveries ​ — ​ — ​ 3 ​ 747 ​ — ​ 2 ​ 752 (Credit) provision for credit losses ​ (256) ​ (1,955) ​ 1,518 ​ 1,943 ​ 557 ​ (7) ​ 1,800 Ending balance ​ $ 10,792 ​ $ 2,566 ​ $ 3,935 ​ $ 12,722 ​ $ 1,297 ​ $ 106 ​ $ 31,418
ASU 2016-13 | As previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Schedule of allowance of credit losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial, ​ Real Estate ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ Real Estate ​ Industrial and ​ Construction ​ Installment/ ​ ​ ​ ​ ​ Real Estate ​ Multi-family ​ Mortgage ​ Agricultural ​ and Land ​ Consumer ​ ​ (In thousands) Mortgage Loans Loans Loans Loans Loans Loans Total Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ 4,676 ​ $ — ​ $ — ​ $ 4,676 Collectively evaluated for impairment ​ ​ 12,150 ​ ​ 4,829 ​ ​ 1,882 ​ ​ 7,907 ​ ​ 1,066 ​ ​ 276 ​ ​ 28,110 Loans acquired with deteriorated credit quality ​ — ​ ​ — ​ ​ — ​ — ​ — ​ ​ — ​ ​ — Total allowance for loan losses ​ $ 12,150 ​ $ 4,829 ​ $ 1,882 ​ $ 12,583 ​ $ 1,066 ​ $ 276 ​ $ 32,786 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ Individually evaluated for impairment ​ $ 5,675 ​ $ — ​ $ 294 ​ $ 21,014 ​ $ — ​ $ — ​ $ 26,983 Collectively evaluated for impairment ​ 1,560,012 ​ 812,174 ​ 492,507 ​ 658,430 ​ 97,311 ​ 24,836 ​ 3,645,270 Loans acquired with deteriorated credit quality ​ — ​ — ​ 343 ​ — ​ — ​ — ​ 343 Total loans ​ $ 1,565,687 ​ $ 812,174 ​ $ 493,144 ​ $ 679,444 ​ $ 97,311 ​ $ 24,836 ​ $ 3,672,596

PREMISES AND EQUIPMENT, NET (Ta

PREMISES AND EQUIPMENT, NET (Tables)	12 Months Ended
	Dec. 31, 2020
PREMISES AND EQUIPMENT, NET
Schedule of components of premises and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Land ​ $ 7,896 ​ $ 7,896 Building and improvements ​ 17,391 ​ 17,271 Furniture, fixtures and equipment ​ 28,682 ​ 25,288 Leasehold improvements ​ 13,355 ​ 12,356 ​ ​ 67,324 ​ 62,811 Accumulated depreciation and amortization ​ (32,452) ​ (28,749) Total premises and equipment, net ​ $ 34,872 ​ $ 34,062

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2020
LEASES
Summary of lease costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 Lease cost ​ ​ ​ ​ ​ ​ Operating lease cost ​ $ 7,643 ​ $ 7,038 Sublease income ​ ​ (37) ​ ​ (95) Total lease cost ​ $ 7,606 ​ $ 6,943
Summary of supplemental cash flow and balance sheet information related to operating leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities ​ ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 7,363 ​ $ 7,019 Operating right-of-use assets obtained in exchange for lease liabilities ​ $ 7,843 ​ $ 48,101 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ December 31, 2019 ​ Weighted-average remaining lease term-operating leases ​ ​ 7.6 years ​ 7.8 years Weighted-average discount rate-operating leases (1) ​ 2.91 % ​ 3.20 % (1) The Company computes the present value of operating lease liabilities using its incremental borrowing rate as the discount rate.
Summary of maturities of operating lease liabilities	​ ​ ​ ​ ​ (In thousands) December 31, 2020 2021 ​ $ 7,387 2022 ​ ​ 7,260 2023 ​ 6,548 2024 ​ ​ 6,297 2025 ​ 6,177 Thereafter ​ 18,649 Total operating lease payments ​ $ 52,318 Less: Interest ​ ​ (5,605) Present value of operating lease liabilities ​ $ 46,713

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS
Schedule of acquired intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2019 ​ ​ Gross ​ ​ ​ Gross ​ ​ ​ ​ Carrying Accumulated Carrying Accumulated (In thousands) Amount Amortization Amount Amortization Intangible assets subject to amortization: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Core deposit intangibles ​ $ 7,211 ​ $ 5,769 ​ $ 7,211 ​ $ 5,113 Intangible assets not subject to amortization: ​ ​ ​ ​ Trademark ​ 259 ​ — ​ 259 ​ — Total intangible assets ​ $ 7,470 ​ $ 5,769 ​ $ 7,470 ​ $ 5,113
Schedule of estimated amortization expense	​ ​ ​ ​ ​ (In thousands) Total 2021 ​ $ 530 2022 ​ 413 2023 ​ 281 2024 ​ 164 2025 ​ 54 Total ​ $ 1,442

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2020
DEPOSITS
Schedule of the remaining maturities of the Bank's time deposits	​ ​ ​ ​ ​ (In thousands) Total 2021 ​ $ 238,117 2022 ​ 26,702 2023 ​ 14,258 2024 ​ 4,897 2025 ​ 4,265 Thereafter ​ 206 Total ​ $ 288,445

SECURITIES SOLD UNDER AGREEME_2

SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Tables)	12 Months Ended
	Dec. 31, 2020
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE.
Schedule of summary of information concerning the securities sold under agreements to repurchase	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Average daily balance during the year ​ $ 1,529 ​ $ 849 ​ Average interest rate during the year ​ 0.05 % 0.05 % Maximum month-end balance during the year ​ $ 1,943 ​ $ 1,037 ​ Weighted average interest rate at year-end ​ 0.05 % 0.05 %

FEDERAL HOME LOAN BANK ADVANC_2

FEDERAL HOME LOAN BANK ADVANCES (Tables)	12 Months Ended
	Dec. 31, 2020
FEDERAL HOME LOAN BANK ADVANCES.
Schedule of FHLB advances	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (Dollars in thousands) 2020 2019 Average daily balance during the year ​ $ 284,719 ​ $ 245,283 ​ Average interest rate during the year ​ 1.40 % 1.86 % Maximum month-end balance during the year ​ $ 340,000 ​ $ 435,000 ​ Weighted average interest rate at year-end ​ 0.35 % 1.82 %
Schedule of contractual maturities and weighted average interest rates of FHLB advances	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (Dollars in thousands) ​ ​ ​ ​ Weighted Contractual Maturity Amount Average Rate Overnight ​ $ — ​ — % ​ ​ ​ ​ ​ ​ ​ 2021 ​ 215,000 0.35 ​ Total FHLB advances ​ $ 215,000 0.35 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 (Dollars in thousands) ​ ​ ​ ​ Weighted Contractual Maturity Amount Average Overnight ​ $ 195,000 ​ 1.81 % ​ ​ ​ ​ ​ ​ ​ 2020 ​ 240,000 1.84 ​ Total FHLB advances ​ $ 435,000 1.82 %

DERIVATIVES (Tables)

DERIVATIVES (Tables)	12 Months Ended
	Dec. 31, 2020
DERIVATIVES.
Schedule of information about the interest rate swap designated as a cash flow hedge	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (Dollars in thousands) 2020 2019 ​ Notional amounts ​ $ 280,000 ​ $ 290,000 ​ Weighted average pay rates ​ 1.33 % 1.84 % Weighted average receive rates ​ 0.23 % 1.94 % Weighted average maturity ​ 3.14 years 2.91 years
Schedule of the net gains (losses) recorded, net of income tax, in accumulated other comprehensive income and the Consolidated Statements of Income relating to the cash flow derivative instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount of gain (loss) ​ Amount of gain ​ ​ ​ ​ ​ ​ ​ ​ reclassified from ​ reclassified from ​ ​ Amount of (loss) gain ​ Amount of (loss) gain ​ Accumulated OCI ​ Accumulated OCI (In thousands) ​ recognized in OCI ​ recognized in OCI ​ into income ​ into income Interest rate contracts included component excluded component included component excluded component Year ended December 31, 2020 ​ $ (10,455) ​ $ — ​ $ (5,016) ​ $ — Year ended December 31, 2019 ​ ​ (3,601) ​ ​ — ​ ​ 1,588 ​ ​ — Year ended December 31, 2018 ​ ​ 2,493 ​ ​ — ​ ​ 1,068 ​ ​ —
Schedule of cash flow hedge included in the Consolidated Balance Sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2019 ​ ​ ​ ​ Fair ​ Fair ​ ​ ​ ​ Fair ​ Fair (In thousands) ​ Notional ​ Value ​ Value ​ Notional ​ Value ​ Value Included in other assets/(liabilities): Amount Asset Liability Amount Asset Liability Interest rate swaps related to FHLB advances ​ $ 215,000 ​ $ — ​ $ (6,651) ​ $ 240,000 ​ $ 1,233 ​ $ (978) Forward starting interest rate swaps related to FHLB advances ​ $ 65,000 ​ $ 11 ​ $ (222) ​ $ 50,000 ​ $ — ​ $ (1,427)
Schedule of information about interest rate swaps	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ (Dollars in thousands) 2020 ​ 2019 Notional amounts ​ $ 1,097,100 ​ ​ $ 823,894 Weighted average pay rates ​ ​ 2.94 % ​ ​ 3.75 % Weighted average receive rates ​ ​ 2.94 % ​ ​ 3.75 % Weighted average maturity ​ ​ 10.02 years ​ ​ 10.77 years Fair value of combined interest rate swaps ​ $ — ​ ​ $ — ​

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2020
INCOME TAXES
Schedule of components of income tax expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Current: ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ $ 16,262 ​ $ 12,665 ​ $ 5,270 State ​ 1,457 ​ 639 ​ 1,023 Total current ​ 17,719 ​ 13,304 ​ 6,293 Deferred: ​ ​ ​ Federal ​ (3,782) ​ (419) ​ 3,299 State ​ (252) ​ 1,175 ​ (451) Total deferred ​ (4,034) ​ 756 ​ 2,848 Total income tax expense ​ $ 13,685 ​ $ 14,060 ​ $ 9,141
Schedule of reconciliation of the expected Federal income tax expense at the statutory tax rate to the actual provision	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2020 2019 2018 ​ ​ ​ ​ ​ Percentage ​ ​ ​ ​ Percentage ​ ​ ​ ​ Percentage ​ ​ ​ ​ ​ of Pre-tax ​ ​ ​ ​ of Pre-tax ​ ​ ​ ​ of Pre-tax ​ (Dollars in thousands) Amount Earnings Amount Earnings Amount Earnings ​ Federal income tax expense computed by applying the statutory rate to income before income taxes ​ $ 11,703 ​ 21 % $ 13,808 ​ 21 % $ 10,157 ​ 21 % Tax-exempt income ​ (851) (1) ​ (920) (1) ​ (1,002) (2) ​ State taxes, net of federal income tax benefit ​ 1,214 2 ​ 1,425 2 ​ 1,999 4 ​ Other ​ 1,619 3 ​ (253) (1) ​ (2,013) (4) ​ Income tax expense ​ $ 13,685 25 % $ 14,060 21 % $ 9,141 19 % ​
Schedule of components of deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Deferred tax assets: ​ ​ ​ ​ ​ ​ Allowance for credit losses and off-balance sheet credit exposure ​ $ 13,983 ​ $ 10,305 Net unrealized losses on securities ​ — ​ 343 Compensation and related benefit obligations ​ 1,674 ​ 2,368 Net deferred loan costs and fees ​ ​ 2,588 ​ ​ — Purchase accounting fair value adjustments ​ 3,574 ​ 4,735 Net change in pension and other post-retirement benefits plans ​ 3,608 ​ 2,809 Net operating loss carryforward ​ 786 ​ 3,229 Net loss on cash flow hedges ​ ​ 1,905 ​ ​ 304 Operating lease liabilities ​ ​ 13,684 ​ ​ 13,444 Other ​ 1,234 ​ 200 Total deferred tax assets ​ 43,036 ​ 37,737 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities: ​ ​ Pension and SERP expense ​ (5,366) ​ (4,904) Net unrealized gains on securities ​ ​ (1,285) ​ ​ — Depreciation ​ (546) ​ (956) REIT undistributed net income ​ (3,178) ​ (2,403) Net deferred loan costs and fees ​ — ​ (2,413) State and local taxes ​ (1,345) ​ (1,227) Operating lease right-of-use assets ​ (13,172) ​ (12,934) Other ​ (970) ​ (835) Total deferred tax liabilities ​ (25,862) ​ (25,672) Net deferred tax asset ​ $ 17,174 ​ $ 12,065

PENSION AND OTHER POSTRETIREM_2

PENSION AND OTHER POSTRETIREMENT PLANS (Tables)	12 Months Ended
	Dec. 31, 2020
PENSION AND OTHER POSTRETIREMENT PLANS.
Schedule of information about changes in obligations and plan assets of the defined benefit pension plan and the defined benefit plan component of the SERP	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ Year Ended December 31, ​ Year Ended December 31, (In thousands) 2020 2019 2020 2019 Change in benefit obligation: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation at beginning of year ​ $ 28,757 ​ $ 23,611 ​ $ 5,323 ​ $ 3,811 Service cost ​ 940 952 ​ 371 261 Interest cost ​ 794 908 ​ 149 147 Benefits paid and expected expenses ​ (609) (475) ​ (112) (112) Assumption changes and other ​ 3,865 3,761 ​ 238 1,216 Benefit obligation at end of year ​ $ 33,747 ​ $ 28,757 ​ $ 5,969 ​ $ 5,323 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value of plan assets at beginning of year ​ $ 39,745 ​ $ 33,874 ​ $ — ​ $ — Actual return on plan assets ​ 3,764 6,346 ​ — — Employer contribution ​ 1,160 — ​ 112 112 Benefits paid and actual expenses ​ (609) (475) ​ (112) (112) Fair value of plan assets at end of year ​ $ 44,060 ​ $ 39,745 ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Funded status at end of year ​ $ 10,313 ​ $ 10,988 ​ $ (5,969) ​ $ (5,323)
Schedule of amounts recognized in accumulated other comprehensive income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ December 31, ​ December 31, (In thousands) 2020 2019 2020 2019 Net actuarial loss ​ $ 10,572 ​ $ 7,997 ​ $ 2,083 ​ $ 2,071 Prior service cost ​ (408) (484) ​ — — Net amount recognized ​ $ 10,164 ​ $ 7,513 ​ $ 2,083 ​ $ 2,071
Schedule of net periodic benefit cost and other amounts recognized in other comprehensive income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ Year Ended December 31, ​ Year Ended December 31, (In thousands) 2020 2019 2018 2020 2019 2018 Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ 940 ​ $ 952 ​ $ 1,106 $ 371 $ 261 $ 290 Interest cost ​ 794 908 794 ​ 149 147 127 Expected return on plan assets ​ (2,905) (2,445) (2,547) ​ — — — Amortization of net loss ​ 431 494 335 ​ 227 70 121 Amortization of prior service credit ​ (77) (77) (77) ​ — — — Amortization of transition obligation ​ — — — ​ — — 5 Net periodic benefit (credit) cost ​ $ (817) ​ $ (168) ​ $ (389) $ 747 $ 478 $ 543 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss (gain) ​ $ 3,006 ​ $ (140) ​ $ 1,980 $ 239 $ 1,216 $ (413) Amortization of net loss ​ (431) (494) (335) ​ (227) (70) (121) Amortization of prior service credit ​ 77 77 77 ​ — — — Amortization of transition obligation ​ — — — ​ — — (5) Total recognized in other comprehensive income ​ $ 2,652 ​ $ (557) ​ $ 1,722 $ 12 $ 1,146 $ (539)
Schedule of average assumptions used to determine benefit obligations and net periodic benefit cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Benefits ​ SERP Benefits ​ ​ December 31, ​ December 31, ​ 2020 2019 2018 2020 2019 2018 Weighted average assumptions used to determine benefit obligations: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 2.33 % 3.10 % 4.14 % 2.28 % 3.08 % 4.13 % Rate of compensation increase 3.00 3.00 3.00 — 5.00 5.00 ​ Weighted average assumptions used to determine net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discount rate 3.10 % 4.14 % 3.52 % 3.08 % 4.13 % 3.50 % Rate of compensation increase 3.00 3.00 3.00 — 5.00 5.00 ​ Expected long-term rate of return 7.25 7.25 7.25 — — — ​
Schedule of target allocations for Plan assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-Average- ​ ​ Target ​ Percentage of Plan Assets ​ Expected Long- ​ ​ ​ Allocation ​ At December 31, ​ term Rate of Asset Category 2021 2020 2019 Return Cash equivalents 0 - 5 % 5.6 % 3.6 % — % Equity securities 45 - 65 ​ 56.8 ​ 57.9 ​ 9.5 ​ Fixed income securities 30 - 50 ​ 37.6 ​ 38.5 ​ 5.0 ​ Total ​ ​ 100.0 ​ 100.0 ​ ​ ​
Schedule of the Plan's fair value hierarchy for its financial assets measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices Significant ​ ​ ​ ​ ​ ​ ​ In Active ​ Other ​ ​ Significant ​ ​ ​ ​ ​ Markets for ​ Observable ​ ​ Unobservable ​ ​ Carrying ​ Identical Assets ​ Inputs ​ ​ Inputs (Dollars in thousands) Value (Level 1) (Level 2) ​ (Level 3) Cash and cash equivalents ​ $ 2,452 $ — $ 2,452 $ — Equities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. large cap ​ 15,449 ​ 15,449 ​ — ​ — U.S. mid cap/small cap ​ 3,471 ​ 3,471 ​ — ​ — International ​ 6,029 ​ 6,029 ​ — ​ — Equities blend ​ 74 ​ 74 ​ — ​ — Total equities ​ 25,023 ​ 25,023 ​ — ​ — Fixed income securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ 1,853 ​ 1,853 ​ — ​ — Government ​ 2,342 ​ — ​ 2,342 ​ — Mortgage-backed ​ 2,325 ​ — ​ 2,325 ​ — High yield bonds and bond funds ​ 10,065 ​ — ​ 10,065 ​ — Total fixed income securities ​ 16,585 ​ 1,853 ​ 14,732 ​ — Total plan assets ​ $ 44,060 ​ $ 26,876 ​ $ 17,184 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Fair Value Measurements Using: ​ ​ ​ Quoted Prices Significant ​ ​ ​ ​ ​ ​ ​ In Active ​ Other ​ ​ Significant ​ ​ ​ ​ ​ Markets for ​ Observable ​ ​ Unobservable ​ ​ Carrying ​ Identical Assets ​ Inputs ​ ​ Inputs (Dollars in thousands) Value (Level 1) (Level 2) ​ (Level 3) Cash and cash equivalents ​ $ 1,444 $ — $ 1,444 $ — Equities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. large cap ​ ​ 12,097 ​ 12,097 ​ — ​ — U.S. mid cap/small cap ​ ​ 4,195 ​ 4,195 ​ — ​ — International ​ ​ 6,320 ​ 6,320 ​ — ​ — Equities blend ​ ​ 414 ​ 414 ​ — ​ — Total equities ​ ​ 23,026 ​ 23,026 ​ — ​ — Fixed income securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ ​ 2,024 ​ 2,024 ​ — ​ — Government ​ ​ 2,926 ​ — ​ 2,926 ​ — Mortgage-backed ​ ​ 1,033 ​ — ​ 1,033 ​ — High yield bonds and bond funds ​ ​ 9,292 ​ — ​ 9,292 ​ — Total fixed income securities ​ ​ 15,275 ​ 2,024 ​ 13,251 ​ — Total plan assets ​ $ 39,745 ​ $ 25,050 ​ $ 14,695 ​ $ —
Schedule of payments, which reflect expected future service, expected to be paid	​ ​ ​ ​ ​ ​ ​ Pension and SERP Year (in thousands) 2021 ​ $ 1,093 2022 ​ 1,180 2023 ​ 1,315 2024 ​ 1,318 2025 ​ 1,395 2026-2030 ​ 10,228

STOCK-BASED COMPENSATION PLANS

STOCK-BASED COMPENSATION PLANS (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of granted stock options, Black-Scholes option-pricing model assumptions	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ ​ 2020 2019 ​ 2018 Dividend yield ​ ​ ​ 3.03 % ​ 2.86 % ​ 2.80 % Expected volatility ​ ​ ​ 23.11 ​ ​ 23.80 ​ ​ 27.53 ​ Risk-free interest rate ​ ​ ​ 1.47 ​ ​ 2.52 ​ ​ 2.67 ​ Expected option life ​ ​ ​ 6.0 years ​ 6.0 years ​ 6.5 years
Schedule of company's stock options	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ ​ ​ ​ ​ ​ Number ​ Average ​ Remaining ​ ​ Aggregate ​ ​ of ​ Exercise ​ Contractual ​ ​ Intrinsic (Dollars in thousands, except per share amounts) Options Price Life Value Outstanding, January 1, 2020 ​ 110,660 $ 35.71 ​ ​ ​ ​ ​ ​ ​ Granted ​ 69,360 ​ ​ 34.87 ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2020 ​ 180,020 ​ 35.39 ​ 8.2 years ​ $ — Vested and Exercisable, December 31, 2020 ​ 110,660 ​ 35.71 ​ 7.7 years ​ ​ — ​ ​ ​ ​ ​ Number of ​ Exercise Options Price 69,360 ​ $ 34.87 63,267 ​ ​ 35.35 47,393 ​ ​ 36.19 180,020 ​ ​ ​
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of status of unvested restricted stock	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average Grant-Date ​ Shares Fair Value Unvested, January 1, 2020 293,717 ​ $ 30.37 Granted 91,428 ​ ​ 31.02 Vested (289,509) ​ ​ 30.34 Forfeited (6,593) ​ ​ 32.16 Unvested, December 31, 2020 89,043 ​ ​ 31.00
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of status of unvested restricted stock	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average Grant-Date ​ Shares Fair Value Unvested, January 1, 2020 ​ 85,342 $ 29.59 Granted ​ 26,556 ​ ​ 32.13 Reinvested dividends ​ 4,491 ​ ​ 30.08 Added by performance factor ​ 605 ​ ​ 33.69 Forfeited ​ (6,623) ​ ​ 28.68 Vested ​ (72,096) ​ ​ 29.10 Unvested, December 31, 2020 ​ 38,275 ​ 32.57

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2020
EARNINGS PER SHARE.
Schedule of computation of EPS	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands, except per share data) 2020 2019 2018 Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227 Dividends paid on and earnings allocated to participating securities ​ (872) (1,096) (853) Income attributable to common stock ​ $ 41,170 ​ $ 50,595 ​ $ 38,374 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average common shares outstanding, including participating securities ​ 19,903 19,952 19,875 Weighted average participating securities ​ (409) (424) (434) Weighted average common shares outstanding ​ 19,494 19,528 ​ 19,441 Basic earnings per common share ​ $ 2.11 ​ $ 2.59 ​ $ 1.97 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income attributable to common stock ​ $ 41,170 ​ $ 50,595 ​ $ 38,374 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average common shares outstanding ​ 19,494 19,528 ​ 19,441 Incremental shares from assumed conversions of options and restricted stock units ​ 55 31 27 Weighted average common and equivalent shares outstanding ​ 19,549 19,559 ​ 19,468 Diluted earnings per common share ​ $ 2.11 ​ $ 2.59 ​ $ 1.97

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS (Tables)	12 Months Ended
	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS
Schedule of commitments outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Standby letters of credit ​ $ 25,501 ​ $ 23,670 Loan commitments outstanding (1) ​ 150,515 ​ 117,044 Unused lines of credit ​ 808,296 ​ 674,194 Total commitments outstanding ​ $ 984,312 ​ $ 814,908 (1) Of the $150.5 million of loan commitments outstanding at December 31, 2020, $5.1 million are fixed rate commitments and $145.4 million are variable rate commitments. Of the $117.0 million of loan commitments outstanding at December 31, 2019, $5.9 million are fixed rate commitments and $111.1 million are variable rate commitments.

REGULATORY CAPITAL REQUIREMEN_2

REGULATORY CAPITAL REQUIREMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
REGULATORY CAPITAL REQUIREMENTS
Schedule of the Company's and Bank's actual capital amounts and ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum To Be Well ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Adequacy Requirement with ​ Capitalized Under Prompt ​ ​ ​ Actual Capital ​ Adequacy Requirement ​ Capital Conservation Buffer ​ Corrective Action Provisions ​ (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio ​ Common equity tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 424,652 ​ 10.3 % $ 185,479 ​ 4.5 % $ 288,523 ​ 7.0 % ​ n/a ​ n/a ​ Bank ​ 503,524 ​ 12.2 ​ 185,465 ​ 4.5 ​ 288,502 ​ 7.0 $ 267,895 ​ 6.5 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 537,664 ​ 13.0 ​ 329,740 ​ 8.0 ​ 432,784 ​ 10.5 n/a ​ n/a ​ Bank ​ 544,536 ​ 13.2 ​ 329,716 ​ 8.0 ​ 432,753 ​ 10.5 412,145 ​ 10.0 ​ Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 424,652 ​ 10.3 ​ 247,305 ​ 6.0 ​ 350,349 ​ 8.5 n/a ​ n/a ​ Bank ​ 503,524 ​ 12.2 ​ 247,287 ​ 6.0 ​ 350,324 ​ 8.5 329,716 ​ 8.0 ​ Tier 1 capital to average assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 424,652 ​ 6.8 ​ 249,502 ​ 4.0 ​ n/a ​ n/a n/a ​ n/a ​ Bank ​ 503,524 ​ 8.1 ​ 249,389 ​ 4.0 ​ n/a ​ n/a 311,737 ​ 5.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum To Be Well ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Adequacy Requirement with ​ Capitalized Under Prompt ​ ​ ​ Actual Capital ​ Adequacy Requirement ​ Capital Conservation Buffer ​ Corrective Action Provisions ​ (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio ​ Common equity tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 397,800 ​ 10.2 % $ 176,121 ​ 4.5 % $ 273,967 ​ 7.0 % ​ n/a ​ n/a ​ Bank ​ 474,056 ​ 12.1 ​ 176,114 ​ 4.5 ​ 273,954 ​ 7.0 $ 254,386 ​ 6.5 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 510,862 ​ 13.1 ​ 313,105 ​ 8.0 ​ 410,950 ​ 10.5 n/a ​ n/a ​ Bank ​ 507,118 ​ 13.0 ​ 313,091 ​ 8.0 ​ 410,932 ​ 10.5 391,363 ​ 10.0 ​ Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 397,800 ​ 10.2 ​ 234,828 ​ 6.0 ​ 332,674 ​ 8.5 n/a ​ n/a ​ Bank ​ 474,056 ​ 12.1 ​ 234,818 ​ 6.0 ​ 332,659 ​ 8.5 313,091 ​ 8.0 ​ Tier 1 capital to average assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 397,800 ​ 8.5 ​ 187,386 ​ 4.0 ​ n/a ​ n/a n/a ​ n/a ​ Bank ​ 474,056 ​ 10.1 ​ 187,377 ​ 4.0 ​ n/a ​ n/a 234,222 ​ 5.0 ​

PARENT COMPANY ONLY CONDENSED_2

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2020
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Schedule of condensed balance sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, (In thousands) 2020 2019 Assets: ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 280 $ 3,663 Other assets ​ ​ 554 ​ 174 Investment in the Bank ​ ​ 596,703 ​ 573,410 Total assets ​ $ 597,537 $ 577,247 ​ ​ ​ ​ ​ ​ ​ Liabilities and stockholders’ equity: ​ ​ ​ ​ ​ Subordinated debentures ​ $ 79,059 $ 78,920 Other liabilities ​ ​ 647 ​ 1,173 Total liabilities ​ ​ 79,706 ​ 80,093 ​ ​ ​ ​ ​ ​ ​ Total stockholders’ equity ​ ​ 517,831 ​ 497,154 Total liabilities and stockholders’ equity ​ $ 597,537 $ 577,247
Schedule of condensed statements of income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Dividends from the Bank ​ $ 26,500 ​ $ 24,500 ​ $ 15,000 Interest expense ​ 4,401 ​ 4,539 ​ 4,539 Non-interest expense ​ 252 ​ 104 ​ 135 Income before income taxes and equity in undistributed earnings of the Bank ​ 21,847 ​ 19,857 ​ 10,326 Income tax benefit ​ (1,280) ​ (994) ​ (1,005) Income before equity in undistributed earnings of the Bank ​ 23,127 ​ 20,851 ​ 11,331 Equity in undistributed earnings of the Bank ​ 18,915 ​ 30,840 ​ 27,896 Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227
Schedule of condensed statements of cash flows	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 42,042 ​ $ 51,691 ​ $ 39,227 Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ Equity in undistributed earnings of the Bank ​ (18,915) ​ (30,840) ​ (27,896) Amortization ​ 139 ​ 139 ​ 140 (Increase) decrease in other assets ​ (379) ​ (73) ​ 108 (Decrease) increase in other liabilities ​ (526) ​ 39 ​ 11 Net cash provided by operating activities ​ 22,361 ​ 20,956 ​ 11,590 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flows from financing activities: ​ ​ ​ ​ ​ ​ Net proceeds from issuance of common stock ​ 1,267 ​ 1,102 ​ 1,017 Purchase of treasury stock ​ (4,633) ​ (625) ​ — Repurchase of surrendered stock from vesting of stock plans ​ (3,181) ​ (887) ​ (586) Cash dividends paid ​ (19,197) ​ (18,420) ​ (18,342) Net cash used in financing activities ​ (25,744) ​ (18,830) ​ (17,911) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (decrease) increase in cash and cash equivalents ​ (3,383) ​ 2,126 ​ (6,321) Cash and cash equivalents at beginning of year ​ 3,663 ​ 1,537 ​ 7,858 Cash and cash equivalents at end of year ​ $ 280 ​ $ 3,663 ​ $ 1,537

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	12 Months Ended
	Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Schedule of other comprehensive (loss) income and related income tax effects	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, (In thousands) 2020 2019 2018 Unrealized holding gains (losses) on available for sale securities ​ $ 9,069 $ 15,524 $ (8,429) Reclassification adjustments for (gains) losses realized in income ​ (3,525) (201) 7,921 Income tax effect ​ ​ (1,628) ​ (4,467) ​ 160 Net change in unrealized gains (losses) on available for sale securities ​ ​ 3,916 ​ 10,856 ​ (348) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrealized net losses arising during the period ​ ​ (3,245) ​ (1,076) ​ (1,567) Reclassification adjustments for amortization realized in income ​ ​ 581 ​ 487 ​ 384 Income tax effect ​ ​ 799 ​ 179 ​ 351 Net change in post-retirement obligation ​ ​ (1,865) ​ (410) ​ (832) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in fair value of derivatives used for cash flow hedges ​ ​ (10,455) ​ (3,601) ​ 2,493 Reclassification adjustments for losses (gains) realized in income ​ ​ 5,016 ​ (1,588) ​ (1,068) Income tax effect ​ ​ 1,601 ​ 1,514 ​ (418) Net change in unrealized (losses) gains on cash flow hedges ​ ​ (3,838) ​ (3,675) ​ 1,007 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive (loss) income ​ $ (1,787) $ 6,771 $ (173)
Schedule of accumulated other comprehensive (loss) income balances, net of income taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ December 31, ​ Comprehensive ​ ​ December 31, (In thousands) 2019 Income (Loss) 2020 Unrealized (losses) gains on available for sale securities ​ $ (829) ​ $ 3,916 ​ $ 3,087 Unrealized losses on pension benefits ​ (6,775) ​ (1,865) ​ (8,640) Unrealized losses on cash flow hedges ​ (737) ​ (3,838) ​ (4,575) Accumulated other comprehensive loss, net of income taxes ​ $ (8,341) ​ $ (1,787) ​ $ (10,128)
Schedule of reclassifications out of accumulated other comprehensive (loss) income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ Affected Line Item in the (In thousands) 2020 2019 2018 Consolidated Statements of Income Realized gains (losses) on sale of available for sale securities ​ $ 3,525 ​ $ 201 ​ $ (7,921) Net securities gains (losses) Amortization of defined benefit pension plan and defined benefit plan component of the SERP: ​ ​ ​ ​ ​ Prior service credit ​ ​ 77 ​ 77 ​ 77 Other operating expenses Transition obligation ​ ​ — ​ — ​ (5) Other operating expenses Actuarial losses ​ ​ (658) ​ (564) ​ (456) Other operating expenses Realized (losses) gains on cash flow hedges ​ ​ (1,651) ​ 1,588 ​ 1,068 Interest expense Realized loss on the termination of swaps ​ ​ (3,365) ​ ​ — ​ ​ — ​ Loss on termination of swaps Total reclassifications, before income tax ​ ​ (2,072) ​ ​ 1,302 ​ ​ (7,237) ​ Income tax benefit (expense) ​ ​ 606 ​ (380) ​ 2,105 Income tax expense Total reclassifications, net of income tax ​ $ (1,466) ​ $ 922 ​ $ (5,132) ​

QUARTERLY FINANCIAL DATA (UNA_2

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2020
QUARTERLY FINANCIAL DATA (UNAUDITED)
Schedule of Selected Consolidated Quarterly Financial Data	Selected Consolidated Quarterly Financial Data follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 Quarter Ended (In thousands, except per share amounts) March 31, June 30, September 30, December 31, Interest income ​ $ 44,602 ​ $ 45,850 ​ $ 46,296 ​ $ 47,484 Interest expense ​ 7,952 ​ 5,418 ​ 5,589 ​ 4,492 Net interest income ​ ​ 36,650 ​ 40,432 ​ 40,707 ​ 42,992 Provision for credit losses ​ ​ 5,000 ​ 4,500 ​ 1,500 ​ 500 ​ Net interest income after provision for credit losses ​ ​ 31,650 ​ 35,932 ​ 39,207 ​ 42,492 Non-interest income ​ ​ 5,217 ​ 2,252 ​ ​ 6,790 ​ 5,444 Non-interest expense ​ ​ 24,843 ​ 24,399 ​ ​ 28,937 (1) 35,078 (2) Income before income taxes ​ ​ 12,024 ​ 13,785 ​ 17,060 ​ 12,858 Income tax expense ​ ​ 2,676 ​ 3,129 ​ 3,999 ​ 3,881 ​ Net income ​ $ 9,348 $ 10,656 $ 13,061 $ 8,977 Basic earnings per share ​ $ 0.47 $ 0.54 $ 0.66 $ 0.45 Diluted earnings per share ​ $ 0.47 $ 0.54 $ 0.66 $ 0.45 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 Quarter Ended (In thousands, except per share amounts) March 31, June 30, September 30, December 31, Interest income ​ $ 44,515 ​ $ 46,352 ​ $ 46,354 ​ $ 44,320 Interest expense ​ 10,192 ​ 10,835 ​ 9,639 ​ 8,672 Net interest income ​ ​ 34,323 ​ 35,517 ​ 36,715 ​ 35,648 Provision for loan losses ​ ​ 600 ​ 3,500 ​ 1,000 ​ 600 ​ Net interest income after provision for loan losses ​ ​ 33,723 ​ 32,017 ​ 35,715 ​ 35,048 Non-interest income ​ ​ 5,218 ​ 5,499 ​ ​ 6,244 ​ 8,426 Non-interest expense ​ ​ 22,599 ​ 24,004 ​ ​ 24,204 ​ 25,332 ​ Income before income taxes ​ ​ 16,342 ​ 13,512 ​ 17,755 ​ 18,142 Income tax expense ​ ​ 3,415 ​ 2,859 ​ 3,852 ​ 3,934 ​ Net income ​ $ 12,927 $ 10,653 $ 13,903 $ 14,208 Basic earnings per share ​ $ 0.65 $ 0.53 $ 0.70 $ 0.71 Diluted earnings per share ​ $ 0.65 $ 0.53 $ 0.70 $ 0.71 (1) 2020 amount includes pre-tax merger expenses of $2.4 million. (2) 2020 amount includes pre-tax merger expenses of $2.1 million.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)segment	Jan. 01, 2021USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Summary Of Accounting Policies [Line Items]
Non-accrual debt securities	$ 0
Accrued interest related to debt securities	$ 0
Reasonable and supportable forecast, period	2 years
Income Taxes
Unrecognized Tax Benefits	$ 0			$ 0
Dividend Restriction
Period from which net retained earnings are available for dividend payment from the Bank to the Parent Company	2 years
Cash dividends paid to the Company	$ 26,500
Segment Reporting
Number of reportable operating segment | segment	1
Standards Effective in 2020
Allowance for credit losses	$ 44,200			32,786	$ 31,418	$ 31,707
Retained earnings	172,075			$ 150,703
Forecast
Dividend Restriction
Dividends from Bank to the Company, available amount		$ 49,800
ASU 2016-13 | Effect of adoption
Standards Effective in 2020
Allowance for credit losses	1,625		$ 1,600
Reserve for unfunded commitments			500
Retained earnings	$ 1,500		$ 0
Core deposit intangibles
Summary Of Accounting Policies [Line Items]
Core deposit intangible assets, useful life (in years)	10 years
Buildings
Summary Of Accounting Policies [Line Items]
Useful life	50 years
Equipment, computer hardware and software and furniture and fixtures | Minimum
Summary Of Accounting Policies [Line Items]
Useful life	2 years
Equipment, computer hardware and software and furniture and fixtures | Maximum
Summary Of Accounting Policies [Line Items]
Useful life	10 years

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans and Allowance for Loan Losses (Details) $ in Thousands	Dec. 31, 2019USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Balance of loans individually evaluated for impairment	$ 26,983

SECURITIES - Summary of Availab

SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale:
Amortized Cost	$ 445,987	$ 639,463
Gross Unrealized Gains	6,775	4,225
Gross Unrealized Losses	(2,402)	(5,397)
Estimated Fair Value	450,360	638,291
U.S. Treasury securities
Available for sale:
Amortized Cost		50,833
Gross Unrealized Losses		(11)
Estimated Fair Value		50,822
U.S. GSE securities
Available for sale:
Amortized Cost		5,000
Gross Unrealized Losses		(5)
Estimated Fair Value		4,995
State and municipal obligations
Available for sale:
Amortized Cost	40,448	34,303
Gross Unrealized Gains	1,650	704
Gross Unrealized Losses	(10)	(43)
Estimated Fair Value	42,088	34,964
U.S. GSE residential mortgage-backed securities
Available for sale:
Amortized Cost	111,398	84,550
Gross Unrealized Gains	1,843	609
Gross Unrealized Losses	(6)	(468)
Estimated Fair Value	113,235	84,691
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Amortized Cost	127,369	278,149
Gross Unrealized Gains	1,661	1,166
Gross Unrealized Losses	(226)	(1,464)
Estimated Fair Value	128,804	277,851
U.S. GSE commercial mortgage-backed securities
Available for sale:
Amortized Cost	24,920	13,656
Gross Unrealized Gains	140	23
Gross Unrealized Losses	(253)	(70)
Estimated Fair Value	24,807	13,609
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Amortized Cost	61,102	102,722
Gross Unrealized Gains	1,286	1,723
Gross Unrealized Losses	(52)	(289)
Estimated Fair Value	62,336	104,156
Other asset backed securities
Available for sale:
Amortized Cost	24,250	24,250
Gross Unrealized Losses	(300)	(849)
Estimated Fair Value	23,950	23,401
Corporate
Available for sale:
Amortized Cost	56,500	46,000
Gross Unrealized Gains	195
Gross Unrealized Losses	(1,555)	(2,198)
Estimated Fair Value	$ 55,140	$ 43,802

SECURITIES - Summary of Held to

SECURITIES - Summary of Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Held to maturity:
Amortized Cost	$ 85,700	$ 133,638
Gross Unrealized Gains	3,634	1,731
Gross Unrealized Losses	(9)	(342)
Estimated Fair Value	89,325	135,027
State and municipal obligations
Held to maturity:
Amortized Cost	23,715	41,008
Gross Unrealized Gains	1,406	809
Estimated Fair Value	25,121	41,817
U.S. GSE residential mortgage-backed securities
Held to maturity:
Amortized Cost	6,272	8,142
Gross Unrealized Gains	227	5
Gross Unrealized Losses		(54)
Estimated Fair Value	6,499	8,093
U.S. GSE residential collateralized mortgage obligations
Held to maturity:
Amortized Cost	18,511	39,936
Gross Unrealized Gains	489	624
Gross Unrealized Losses	(9)	(62)
Estimated Fair Value	18,991	40,498
U.S. GSE commercial mortgage-backed securities
Held to maturity:
Amortized Cost	13,069	17,215
Gross Unrealized Gains	625	102
Gross Unrealized Losses		(82)
Estimated Fair Value	13,694	17,235
U.S. GSE commercial collateralized mortgage obligations
Held to maturity:
Amortized Cost	24,133	27,337
Gross Unrealized Gains	887	191
Gross Unrealized Losses		(144)
Estimated Fair Value	$ 25,020	$ 27,384

SECURITIES - Total Available fo

SECURITIES - Total Available for Sale and Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Total securities
Amortized Cost	$ 531,687	$ 773,101
Gross Unrealized Gains	10,409	5,956
Gross Unrealized Losses	(2,411)	(5,739)
Total securities	$ 539,685	$ 773,318

SECURITIES - Available for Sale

SECURITIES - Available for Sale Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale:
Less than 12 months, Estimated Fair Value	$ 95,818	$ 175,474
Less than 12 months, Gross Unrealized Losses	(614)	(778)
Greater than 12 months, Estimated Fair Value	33,120	214,908
Greater than 12 months, Gross Unrealized Losses	(1,788)	(4,619)
U.S. Treasury securities
Available for sale:
Less than 12 months, Estimated Fair Value		50,822
Less than 12 months, Gross Unrealized Losses		(11)
U.S. GSE securities
Available for sale:
Less than 12 months, Estimated Fair Value		0
Less than 12 months, Gross Unrealized Losses		0
Greater than 12 months, Estimated Fair Value		4,995
Greater than 12 months, Gross Unrealized Losses		(5)
State and municipal obligations
Available for sale:
Less than 12 months, Estimated Fair Value	5,310	4,982
Less than 12 months, Gross Unrealized Losses	(10)	(42)
Greater than 12 months, Estimated Fair Value		76
Greater than 12 months, Gross Unrealized Losses		(1)
U.S. GSE residential mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value		2,935
Less than 12 months, Gross Unrealized Losses		(30)
Greater than 12 months, Estimated Fair Value	152	39,617
Greater than 12 months, Gross Unrealized Losses	(6)	(438)
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	55,832	81,377
Less than 12 months, Gross Unrealized Losses	(226)	(480)
Greater than 12 months, Estimated Fair Value		93,403
Greater than 12 months, Gross Unrealized Losses		(984)
U.S. GSE commercial mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	14,994	6,648
Less than 12 months, Gross Unrealized Losses	(253)	(70)
Greater than 12 months, Estimated Fair Value		0
Greater than 12 months, Gross Unrealized Losses		0
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	11,755	28,710
Less than 12 months, Gross Unrealized Losses	(52)	(145)
Greater than 12 months, Estimated Fair Value		9,614
Greater than 12 months, Gross Unrealized Losses		(144)
Other asset backed securities
Available for sale:
Less than 12 months, Estimated Fair Value		0
Less than 12 months, Gross Unrealized Losses		0
Greater than 12 months, Estimated Fair Value	3,450	23,401
Greater than 12 months, Gross Unrealized Losses	(300)	(849)
Corporate
Available for sale:
Less than 12 months, Estimated Fair Value	7,927	0
Less than 12 months, Gross Unrealized Losses	(73)	0
Greater than 12 months, Estimated Fair Value	29,518	43,802
Greater than 12 months, Gross Unrealized Losses	$ (1,482)	$ (2,198)

SECURITIES - Held to Maturity S

SECURITIES - Held to Maturity Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2019USD ($)
Held to maturity:
Less than 12 months, Estimated Fair Value	$ 19,788
Less than 12 months, Gross Unrealized losses	(74)
Greater than 12 months, Estimated Fair Value	22,707
Greater than 12 months, Gross Unrealized losses	(268)
U.S. GSE residential mortgage-backed securities
Held to maturity:
Less than 12 months, Estimated Fair Value	0
Less than 12 months, Gross Unrealized losses	0
Greater than 12 months, Estimated Fair Value	7,268
Greater than 12 months, Gross Unrealized losses	(54)
U.S. GSE residential collateralized mortgage obligations
Held to maturity:
Less than 12 months, Estimated Fair Value	6,750
Less than 12 months, Gross Unrealized losses	(17)
Greater than 12 months, Estimated Fair Value	6,105
Greater than 12 months, Gross Unrealized losses	(45)
U.S. GSE commercial mortgage-backed securities
Held to maturity:
Less than 12 months, Estimated Fair Value	0
Less than 12 months, Gross Unrealized losses	0
Greater than 12 months, Estimated Fair Value	5,034
Greater than 12 months, Gross Unrealized losses	(82)
U.S. GSE commercial collateralized mortgage obligations
Held to maturity:
Less than 12 months, Estimated Fair Value	13,038
Less than 12 months, Gross Unrealized losses	(57)
Greater than 12 months, Estimated Fair Value	4,300
Greater than 12 months, Gross Unrealized losses	$ (87)

SECURITIES - Available for Sa_2

SECURITIES - Available for Sale Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost, Available for sale:
Within one year	$ 4,131
One to five years	58,608
Five to ten years	38,415
Beyond ten years	344,833
Total	445,987	$ 639,463
Estimated Fair Value, Available for sale:
Within one year	4,116
One to five years	58,861
Five to ten years	38,597
Beyond ten years	348,786
Estimated Fair Value	450,360	638,291
U.S. Treasury securities
Amortized Cost, Available for sale:
Total		50,833
Estimated Fair Value, Available for sale:
Estimated Fair Value		50,822
U.S. GSE securities
Amortized Cost, Available for sale:
Total		5,000
Estimated Fair Value, Available for sale:
Estimated Fair Value		4,995
State and municipal obligations
Amortized Cost, Available for sale:
Total	40,448	34,303
Estimated Fair Value, Available for sale:
Estimated Fair Value	42,088	34,964
U.S. GSE residential mortgage-backed securities
Amortized Cost, Available for sale:
Total	111,398	84,550
Estimated Fair Value, Available for sale:
Estimated Fair Value	113,235	84,691
U.S. GSE residential collateralized mortgage obligations
Amortized Cost, Available for sale:
Total	127,369	278,149
Estimated Fair Value, Available for sale:
Estimated Fair Value	128,804	277,851
U.S. GSE commercial mortgage-backed securities
Amortized Cost, Available for sale:
Total	24,920	13,656
Estimated Fair Value, Available for sale:
Estimated Fair Value	24,807	13,609
U.S. GSE commercial collateralized mortgage obligations
Amortized Cost, Available for sale:
Total	61,102	102,722
Estimated Fair Value, Available for sale:
Estimated Fair Value	62,336	104,156
Other asset backed securities
Amortized Cost, Available for sale:
Total	24,250	24,250
Estimated Fair Value, Available for sale:
Estimated Fair Value	23,950	23,401
Corporate
Amortized Cost, Available for sale:
Total	56,500	46,000
Estimated Fair Value, Available for sale:
Estimated Fair Value	$ 55,140	$ 43,802

SECURITIES - Held to Maturity I

SECURITIES - Held to Maturity Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost, Held to maturity:
Within one year	$ 1,885
One to five years	23,140
Five to ten years	11,535
Beyond ten years	49,140
Total	85,700	$ 133,638
Estimated Fair Value, Held to maturity:
Within one year	1,902
One to five years	24,452
Five to ten years	12,144
Beyond ten years	50,827
Estimated Fair Value	89,325	135,027
State and municipal obligations
Amortized Cost, Held to maturity:
Total	23,715	41,008
Estimated Fair Value, Held to maturity:
Estimated Fair Value	25,121	41,817
U.S. GSE residential mortgage-backed securities
Amortized Cost, Held to maturity:
Total	6,272	8,142
Estimated Fair Value, Held to maturity:
Estimated Fair Value	6,499	8,093
U.S. GSE residential collateralized mortgage obligations
Amortized Cost, Held to maturity:
Total	18,511	39,936
Estimated Fair Value, Held to maturity:
Estimated Fair Value	18,991	40,498
U.S. GSE commercial mortgage-backed securities
Amortized Cost, Held to maturity:
Total	13,069	17,215
Estimated Fair Value, Held to maturity:
Estimated Fair Value	13,694	17,235
U.S. GSE commercial collateralized mortgage obligations
Amortized Cost, Held to maturity:
Total	24,133	27,337
Estimated Fair Value, Held to maturity:
Estimated Fair Value	$ 25,020	$ 27,384

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities
Number of securities in unrealized loss position | security	0
Debt securities available for sale, allowance of credit losses	$ 0
Allowance for credit losses	$ 0
Guaranteed portion of student loan backed bonds	student loan backed bonds, which are guaranteed by the U.S. Department of Education for 97% to 100% of principal
Credit support for student loan backed bonds description	the bonds have credit support of 3% to 5%
Proceeds from sales of securities available for sale	$ 152,980	$ 46,478	$ 230,372
Gross gains realized on sale of securities available for sale	4,300	200
Gross losses realized on sale of securities available for sale	800		(7,900)
Debt and Equity Securities, Gain (Loss)	3,525	201	(7,921)
Proceeds from calls of securities	14,900	20,300	$ 3,300
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings	402,800	402,200
Trading securities	$ 0	$ 0
Threshold for disclosure percentage	10.00%	10.00%
Amount owned in FHLB, ACBB and FRB stock	$ 23,362	$ 32,879
Other Assets
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities
Accrued interest receivable on securities	$ 1,400

FAIR VALUE - Summary of Assets

FAIR VALUE - Summary of Assets and Liabilities measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets measured at fair value on recurring basis
Available for sale securities	$ 450,360	$ 638,291
Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	450,360	638,291
Financial Assets: Derivatives	49,662	15,437
Financial Liabilities:
Financial liabilities: Derivatives	56,417	16,645
Fair Value
Assets measured at fair value on recurring basis
Available for sale securities	450,360	638,291
Financial Assets: Derivatives	49,662	15,437
Financial Liabilities:
Financial liabilities: Derivatives	56,417	16,645
U.S. Treasury securities
Assets measured at fair value on recurring basis
Available for sale securities		50,822
U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities		4,995
State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities	42,088	34,964
U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	113,235	84,691
U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	128,804	277,851
U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	24,807	13,609
U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	62,336	104,156
Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities	23,950	23,401
Corporate
Assets measured at fair value on recurring basis
Available for sale securities	55,140	43,802
Significant Other Observable Inputs (Level 2)
Assets measured at fair value on recurring basis
Available for sale securities	450,360	638,291
Financial Assets: Derivatives	49,662	15,437
Financial Liabilities:
Financial liabilities: Derivatives	56,417	16,645
Recurring basis | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	450,360	638,291
Recurring basis | U.S. Treasury securities | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities		50,822
Recurring basis | U.S. GSE securities | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities		4,995
Recurring basis | State and municipal obligations | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	42,088	34,964
Recurring basis | U.S. GSE residential mortgage-backed securities | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	113,235	84,691
Recurring basis | U.S. GSE residential collateralized mortgage obligations | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	128,804	277,851
Recurring basis | U.S. GSE commercial mortgage-backed securities | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	24,807	13,609
Recurring basis | U.S. GSE commercial collateralized mortgage obligations | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	62,336	104,156
Recurring basis | Other asset backed securities | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	23,950	23,401
Recurring basis | Corporate | Carrying Amount
Assets measured at fair value on recurring basis
Available for sale securities	55,140	43,802
Recurring basis | Derivatives | Carrying Amount
Assets measured at fair value on recurring basis
Financial Assets: Derivatives	49,662	15,437
Financial Liabilities:
Financial liabilities: Derivatives	56,417	16,645
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets measured at fair value on recurring basis
Available for sale securities	450,360	638,291
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Assets measured at fair value on recurring basis
Available for sale securities		50,822
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities		4,995
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities	42,088	34,964
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	113,235	84,691
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	128,804	277,851
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	24,807	13,609
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	62,336	104,156
Recurring basis | Significant Other Observable Inputs (Level 2) | Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities	23,950	23,401
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate
Assets measured at fair value on recurring basis
Available for sale securities	55,140	43,802
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivatives
Assets measured at fair value on recurring basis
Financial Assets: Derivatives	49,662	15,437
Financial Liabilities:
Financial liabilities: Derivatives	$ 56,417	$ 16,645

FAIR VALUE - Summary of Asset_2

FAIR VALUE - Summary of Assets and Liabilities measured on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets measured at fair value on non-recurring basis
Loans held for sale	$ 52,800	$ 12,600
Other real estate owned	0
Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	52,785	12,643
Fair Value
Assets measured at fair value on non-recurring basis
Loans held for sale	52,785	12,643
Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets measured at fair value on non-recurring basis
Loans held for sale	42,785
Significant Unobservable Inputs (Level 3)
Assets measured at fair value on non-recurring basis
Loans held for sale	10,000	12,643
Non-recurring basis | Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	52,785	12,643
Individually evaluated loans	2,940
Impaired loans		6,981
Non-recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | Fair Value
Assets measured at fair value on non-recurring basis
Loans held for sale	42,785
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Fair Value
Assets measured at fair value on non-recurring basis
Loans held for sale	10,000	12,643
Individually evaluated loans	$ 2,940
Impaired loans		$ 6,981

FAIR VALUE - Narrative (Details

FAIR VALUE - Narrative (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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses	$ 500	$ 1,500	$ 4,500	$ 5,000	$ 600	$ 1,000	$ 3,500	$ 600	$ 11,500	$ 5,700	$ 1,800
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded					11,657					11,657	2,721
Valuation allowance on impaired loans					4,676					4,676	$ 189
Loans held for sale	52,800				12,600				52,800	12,600
Other Real Estate	0								0
Real estate owned additional provision									0	0
Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses									2,600
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	9,600				11,700				9,600	11,700
Valuation allowance on impaired loans	6,700				4,700				6,700	4,700
Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	52,785				12,643				52,785	12,643
Carrying Amount | Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of impaired loans					6,981					6,981
Individually evaluated commercial and industrial loans	2,940								2,940
Assets measured at fair value on non-recurring basis
Valuation allowance on impaired loans	2,900				0				2,900	0
Loans held for sale	$ 52,785				$ 12,643				$ 52,785	$ 12,643

FAIR VALUE - Summary of Estimat

FAIR VALUE - Summary of Estimated Fair Values and Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Cash and due from banks	$ 107,729	$ 77,693
Interest-bearing deposits with banks	769,099	39,501
Securities available for sale	450,360	638,291
Securities held to maturity	89,325	135,027
Loans held for sale	52,800	12,600
Accrued interest receivable	16,566	10,908
Financial liabilities:
Certificates of deposit	288,445
Carrying Amount
Financial assets:
Cash and due from banks	107,729	77,693
Interest-bearing deposits with banks	769,099	39,501
Securities available for sale	450,360	638,291
Securities restricted	23,362	32,879
Securities held to maturity	85,700	133,638
Loans held for sale	52,785	12,643
Loans, net	4,553,203	3,647,499
Derivatives	49,662	15,437
Accrued interest receivable	16,566	10,908
Financial liabilities:
Certificates of deposit	288,445	307,977
Demand and other deposits	5,200,808	3,506,670
FHLB advances	215,000	435,000
Repurchase agreements	1,223	999
Subordinated debentures	79,059	78,920
Derivatives	56,417	16,645
Accrued interest payable	881	1,467
Fair Value
Financial assets:
Cash and due from banks	107,729	77,693
Interest-bearing deposits with banks	769,099	39,501
Securities available for sale	450,360	638,291
Securities held to maturity	89,325	135,027
Loans held for sale	52,785	12,643
Loans, net	4,554,333	3,685,770
Derivatives	49,662	15,437
Accrued interest receivable	16,566	10,908
Financial liabilities:
Certificates of deposit	290,971	308,660
Demand and other deposits	5,200,808	3,506,670
FHLB advances	221,665	434,622
Repurchase agreements	1,223	999
Subordinated debentures	86,704	81,010
Derivatives	56,417	16,645
Accrued interest payable	881	1,467
Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and due from banks	107,729	77,693
Interest-bearing deposits with banks	769,099	39,501
Loans held for sale	42,785
Loans, net	0
Financial liabilities:
Demand and other deposits	5,200,808	3,506,670
FHLB advances		195,000
Significant Other Observable Inputs (Level 2)
Financial assets:
Securities available for sale	450,360	638,291
Securities held to maturity	89,325	135,027
Loans, net	0
Derivatives	49,662	15,437
Accrued interest receivable	1,421	2,181
Financial liabilities:
Certificates of deposit	290,971	308,660
FHLB advances	221,665	239,622
Repurchase agreements	1,223	999
Subordinated debentures	86,704	81,010
Derivatives	56,417	16,645
Accrued interest payable	881	1,467
Significant Unobservable Inputs (Level 3)
Financial assets:
Loans held for sale	10,000	12,643
Loans, net	4,554,333	3,685,770
Accrued interest receivable	$ 15,145	$ 8,727

LOANS - Major Classifications o

LOANS - Major Classifications of Loans (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2020USD ($)family	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Classifications of loans
Total loans			$ 4,605,583	$ 3,672,596
Net deferred loan (fees) costs			(8,180)	7,689
Total loans held for investment			4,597,403	3,680,285
Allowance for credit losses			(44,200)	(32,786)	$ (31,418)	$ (31,707)
Loans, net			4,553,203	3,647,499
Accrued interest receivable			16,566	10,908
Loans held for sale			52,800	12,600
Decrease in loan held for sale			(2,877)
Other Assets
Classifications of loans
Accrued interest receivable			15,100	8,700
Commercial Real Estate | Mortgage loans
Classifications of loans
Total loans				1,565,687
Allowance for credit losses			(8,534)	(12,150)	(10,792)	(11,048)
Loans held for investment to loans held for sale and written down		$ 16,300
Loans held for sale		12,600	10,000	12,600
Mortgage loan, charge-off recognized		$ 3,700
Lending Risk
Loan amount beyond which annual financial information is sought			1,000
Owner occupied
Classifications of loans
Total loans			557,076	531,088
Non-owner occupied
Classifications of loans
Total loans			1,081,443	1,034,599
Multi-family
Classifications of loans
Total loans				812,174
Allowance for credit losses			(1,736)	(4,829)	(2,566)	(4,521)
Multi-family | Mortgage loans
Classifications of loans
Total loans			$ 899,730	812,174
Lending Risk
Number of families having income producing residential investment properties | family			5
Residential Real Estate Loans
Classifications of loans
Total loans			$ 434,689	493,144
Residential Real Estate Loans | Mortgage loans
Classifications of loans
Total loans			434,689	493,144
Allowance for credit losses			(3,062)	(1,882)	(3,935)	(2,438)
Commercial, industrial and agricultural:
Classifications of loans
Total loans			1,527,147	679,444
Allowance for credit losses			(27,363)	(12,583)	(12,722)	(12,838)
Real estate construction and land loans
Classifications of loans
Total loans			82,479	97,311
Allowance for credit losses			(2,175)	(1,066)	(1,297)	(740)
Installment/consumer loans
Classifications of loans
Total loans			23,019	24,836
Allowance for credit losses			(1,330)	(276)	$ (106)	$ (122)
Leveraged lending portfolio
Classifications of loans
Leveraged lending portfolio disposed				43,000
Mortgage loan, charge-off recognized			42,800
Decrease in loan held for sale			$ 234
Maximum | Multi-family | Mortgage loans
Lending Risk
Loan-to-value ratio (as a percent)			75.00%
Home equity | Minimum | Residential Real Estate Loans | Mortgage loans
Lending Risk
Loan-to-value ratio (as a percent)			80.00%
Paycheck Protection Program
Classifications of loans
Loans, net			$ 844,700
Carrying Amount
Classifications of loans
Accrued interest receivable			16,566	10,908
Loans held for sale			$ 52,785	$ 12,643
Mortgage loan, charge-off recognized	$ 10,000
Decrease in loan held for sale	$ 2,600

LOANS - Categorized by Internal

LOANS - Categorized by Internally Assigned Risk Grades (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans by class categorized by internally assigned risk grades
Total loans	$ 4,605,583	$ 3,672,596
2020	1,478,560
2019	778,152
2018	344,823
2017	536,632
2016	298,865
2015 and prior	708,640
Revolving	436,376
Revolving Term	23,535
Total	4,605,583
Pass
Loans by class categorized by internally assigned risk grades
Total loans		3,584,290
Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		47,003
Substandard
Loans by class categorized by internally assigned risk grades
Total loans		41,303
Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Commercial Real Estate | Mortgage loans
Loans by class categorized by internally assigned risk grades
Total loans		1,565,687
Commercial Real Estate | Mortgage loans | Owner occupied
Loans by class categorized by internally assigned risk grades
Total loans	557,076	531,088
2020	95,092
2019	98,605
2018	59,137
2017	87,914
2016	32,526
2015 and prior	183,802
Total	557,076
Commercial Real Estate | Mortgage loans | Owner occupied | Pass
Loans by class categorized by internally assigned risk grades
Total loans		511,444
2020	92,053
2019	96,679
2018	47,224
2017	66,320
2016	25,852
2015 and prior	153,766
Total	481,894
Commercial Real Estate | Mortgage loans | Owner occupied | Watch
Loans by class categorized by internally assigned risk grades
2020	727
2019	1,373
2018	8,038
2017	10,737
2016	3,425
2015 and prior	23,919
Total	48,219
Commercial Real Estate | Mortgage loans | Owner occupied | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		18,426
2020	1,843
2018	3,875
2017	10,857
2016	823
2015 and prior	4,600
Total	21,998
Commercial Real Estate | Mortgage loans | Owner occupied | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		1,218
2020	469
2019	553
2016	2,426
2015 and prior	1,517
Total	4,965
Commercial Real Estate | Mortgage loans | Owner occupied | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Commercial Real Estate | Mortgage loans | Non-owner occupied
Loans by class categorized by internally assigned risk grades
Total loans	1,081,443	1,034,599
2020	189,125
2019	257,482
2018	120,931
2017	201,358
2016	72,499
2015 and prior	240,048
Total	1,081,443
Commercial Real Estate | Mortgage loans | Non-owner occupied | Pass
Loans by class categorized by internally assigned risk grades
Total loans		1,022,208
2020	181,811
2019	249,782
2018	108,086
2017	180,235
2016	54,252
2015 and prior	214,620
Total	988,786
Commercial Real Estate | Mortgage loans | Non-owner occupied | Watch
Loans by class categorized by internally assigned risk grades
2020	7,314
2019	7,700
2018	12,845
2017	12,117
2016	12,209
2015 and prior	24,089
Total	76,274
Commercial Real Estate | Mortgage loans | Non-owner occupied | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		0
2015 and prior	290
Total	290
Commercial Real Estate | Mortgage loans | Non-owner occupied | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		12,391
2017	9,006
2016	6,038
2015 and prior	1,049
Total	16,093
Commercial Real Estate | Mortgage loans | Non-owner occupied | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Multi-family
Loans by class categorized by internally assigned risk grades
Total loans		812,174
2020	174,737
2019	296,476
2018	40,840
2017	113,598
2016	154,822
2015 and prior	119,257
Total	899,730
Multi-family | Pass
Loans by class categorized by internally assigned risk grades
2020	159,301
2019	293,752
2018	40,840
2017	86,169
2016	118,846
2015 and prior	106,044
Total	804,952
Multi-family | Watch
Loans by class categorized by internally assigned risk grades
2020	15,436
2019	2,724
2017	19,331
2016	35,976
2015 and prior	12,825
Total	86,292
Multi-family | Special Mention
Loans by class categorized by internally assigned risk grades
2017	8,098
2015 and prior	388
Total	8,486
Multi-family | Mortgage loans
Loans by class categorized by internally assigned risk grades
Total loans	899,730	812,174
Multi-family | Mortgage loans | Pass
Loans by class categorized by internally assigned risk grades
Total loans		811,770
Multi-family | Mortgage loans | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		404
Multi-family | Mortgage loans | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		0
Multi-family | Mortgage loans | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Residential Real Estate Loans
Loans by class categorized by internally assigned risk grades
Total loans	434,689	493,144
2020	20,033
2019	34,133
2018	73,636
2017	96,970
2016	24,130
2015 and prior	122,104
Revolving	54,035
Revolving Term	9,648
Total	434,689
Residential Real Estate Loans | Pass
Loans by class categorized by internally assigned risk grades
Total loans		475,949
2020	20,033
2019	32,564
2018	71,903
2017	95,712
2016	23,589
2015 and prior	106,518
Revolving	53,217
Revolving Term	7,012
Total	410,548
Residential Real Estate Loans | Watch
Loans by class categorized by internally assigned risk grades
2018	406
2017	321
2016	541
2015 and prior	1,740
Revolving Term	1,145
Total	4,153
Residential Real Estate Loans | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		12,400
2019	1,103
2018	758
2015 and prior	6,879
Revolving	818
Revolving Term	633
Total	10,191
Residential Real Estate Loans | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		4,795
2019	466
2018	569
2017	937
2015 and prior	6,967
Revolving Term	858
Total	9,797
Residential Real Estate Loans | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Residential Real Estate Loans | Mortgage loans
Loans by class categorized by internally assigned risk grades
Total loans	434,689	493,144
Commercial, industrial and agricultural:
Loans by class categorized by internally assigned risk grades
Total loans	1,527,147	679,444
2020	960,233
2019	70,293
2018	40,806
2017	24,241
2016	14,888
2015 and prior	40,637
Revolving	364,413
Revolving Term	11,636
Total	1,527,147
Commercial, industrial and agricultural: | Pass
Loans by class categorized by internally assigned risk grades
Total loans		643,413
2020	949,257
2019	62,410
2018	30,736
2017	17,646
2016	12,685
2015 and prior	26,606
Revolving	304,781
Revolving Term	5,086
Total	1,409,207
Commercial, industrial and agricultural: | Watch
Loans by class categorized by internally assigned risk grades
2020	8,062
2019	6,140
2018	8,265
2017	1,574
2016	1,188
2015 and prior	3,048
Revolving	40,448
Revolving Term	1,527
Total	70,252
Commercial, industrial and agricultural: | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		15,670
2020	2,914
2019	838
2018	572
2017	1,507
2016	545
2015 and prior	1,323
Revolving	18,984
Revolving Term	2,073
Total	28,756
Commercial, industrial and agricultural: | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		20,361
2019	905
2018	1,233
2017	3,514
2016	470
2015 and prior	9,660
Revolving	200
Revolving Term	2,950
Total	18,932
Commercial, industrial and agricultural: | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Real estate construction and land loans
Loans by class categorized by internally assigned risk grades
Total loans	82,479	97,311
2020	37,684
2019	20,948
2018	9,307
2017	12,458
2015 and prior	2,082
Total	82,479
Real estate construction and land loans | Pass
Loans by class categorized by internally assigned risk grades
Total loans		95,530
2020	37,684
2019	20,948
2018	8,229
2017	11,308
2015 and prior	1,701
Total	79,870
Real estate construction and land loans | Watch
Loans by class categorized by internally assigned risk grades
2017	1,150
2015 and prior	270
Total	1,420
Real estate construction and land loans | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		0
2018	1,078
Total	1,078
Real estate construction and land loans | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		1,781
2015 and prior	111
Total	111
Real estate construction and land loans | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		0
Installment/consumer loans
Loans by class categorized by internally assigned risk grades
Total loans	23,019	24,836
2020	1,656
2019	215
2018	166
2017	93
2015 and prior	710
Revolving	17,928
Revolving Term	2,251
Total	23,019
Installment/consumer loans | Pass
Loans by class categorized by internally assigned risk grades
Total loans		23,976
2020	1,656
2019	215
2018	166
2017	93
2015 and prior	710
Revolving	17,382
Revolving Term	1,257
Total	21,479
Installment/consumer loans | Watch
Loans by class categorized by internally assigned risk grades
Revolving	496
Revolving Term	40
Total	536
Installment/consumer loans | Special Mention
Loans by class categorized by internally assigned risk grades
Total loans		103
Revolving Term	46
Total	46
Installment/consumer loans | Substandard
Loans by class categorized by internally assigned risk grades
Total loans		757
Revolving	50
Revolving Term	908
Total	$ 958
Installment/consumer loans | Doubtful
Loans by class categorized by internally assigned risk grades
Total loans		$ 0

LOANS - Past Due and Nonaccrual

LOANS - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	$ 0	$ 343
Nonaccrual Including 90 Days or More Past Due	12,162	4,369
Total Past Due and Nonaccrual	23,775	11,078
Current	4,581,808	3,661,518
Total Loans	4,605,583	3,672,596
Interest earned on non-accrual loans	93
Accrued interest on non-accrual loans	406
30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	6,588	4,465
60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	5,025	1,901
Commercial Real Estate | Mortgage loans
Past Due and Nonaccrual Loans
Total Loans		1,565,687
Commercial Real Estate | Mortgage loans | Owner occupied
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	636	225
Total Past Due and Nonaccrual	636	1,575
Current	556,440	529,513
Total Loans	557,076	531,088
Commercial Real Estate | Mortgage loans | Owner occupied | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	917
Commercial Real Estate | Mortgage loans | Owner occupied | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	433
Commercial Real Estate | Mortgage loans | Non-owner occupied
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	6,771	512
Total Past Due and Nonaccrual	6,771	610
Current	1,074,672	1,033,989
Total Loans	1,081,443	1,034,599
Commercial Real Estate | Mortgage loans | Non-owner occupied | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	98
Multi-family
Past Due and Nonaccrual Loans
Total Loans		812,174
Multi-family | Mortgage loans
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	0	0
Total Past Due and Nonaccrual	0	0
Current	899,730	812,174
Total Loans	899,730	812,174
Multi-family | Mortgage loans | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	0
Multi-family | Mortgage loans | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	0
Residential Real Estate Loans
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	343
Nonaccrual Including 90 Days or More Past Due	2,897	2,743
Total Past Due and Nonaccrual	7,413	6,886
Current	427,276	486,258
Total Loans	434,689	493,144
Residential Real Estate Loans | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	3,567	3,053
Residential Real Estate Loans | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	949	747
Residential Real Estate Loans | Mortgage loans
Past Due and Nonaccrual Loans
Total Loans	434,689	493,144
Commercial, industrial and agricultural:
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	1,597	736
Total Past Due and Nonaccrual	8,380	1,730
Current	1,518,767	677,714
Total Loans	1,527,147	679,444
Commercial, industrial and agricultural: | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	2,711	273
Commercial, industrial and agricultural: | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	4,072	721
Real estate construction and land loans
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	111	123
Total Past Due and Nonaccrual	321	123
Current	82,158	97,188
Total Loans	82,479	97,311
Real estate construction and land loans | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	210	0
Real estate construction and land loans | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	0	0
Installment/consumer loans
Past Due and Nonaccrual Loans
>90 Days Past Due and Accruing	0	0
Nonaccrual Including 90 Days or More Past Due	150	30
Total Past Due and Nonaccrual	254	154
Current	22,765	24,682
Total Loans	23,019	24,836
Installment/consumer loans | 30-59 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	100	124
Installment/consumer loans | 60-89 Days Past Due
Past Due and Nonaccrual Loans
Total Past Due and Nonaccrual	$ 4	$ 0

LOANS - Troubled Debt Restructu

LOANS - Troubled Debt Restructurings (Details) $ in Thousands	Jan. 21, 2021USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)item	Dec. 31, 2020USD ($)itemloan	Dec. 31, 2019USD ($)itemloan	Dec. 31, 2018USD ($)itemloan
Troubled Debt Restructurings
Number of Loans | loan				3	19	12
Pre-Modification Outstanding Recorded Investment				$ 1,138	$ 21,748	$ 9,219
Post-Modification Outstanding Recorded Investment				$ 1,138	21,748	9,219
Period of modified contractually past due loans to be considered as payment default				30 days
Charge offs relating to TDRs				$ 1,700	$ 100	$ 400
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification | item				1	2	1
Nonaccrual TDRs loans				$ 346	$ 405
Increase (decrease) in non accrual troubled debt restructuring			$ 2,700
Amount of performing TDR loans				22,200	26,300
Post-Modification of other than TDRs, recorded investment				$ 191,100
Payment deferral
Troubled Debt Restructurings
Number of loans granted payment moratoriums, COVID-19 | item				500
Loans granted payment moratoriums, COVID-19				$ 635,000
Loans and leases receivable deferral term, COVID-19				3 months
Payment deferral | Forecast
Troubled Debt Restructurings
Loans granted payment moratoriums, COVID-19	$ 76,100
Settlement Agreement
Troubled Debt Restructurings
Charge offs relating to TDRs		$ 1,300
Settlement agreement, payments received		$ 1,400
Secured
Troubled Debt Restructurings
Nonaccrual TDRs loans					$ 216
Number of non-accrual TDRs | item					1
Unsecured
Troubled Debt Restructurings
Nonaccrual TDRs loans				$ 130
Number of non-accrual TDRs | item			1	3
Commercial Real Estate | Owner occupied
Troubled Debt Restructurings
Number of Loans | item					3
Pre-Modification Outstanding Recorded Investment					$ 8,582
Post-Modification Outstanding Recorded Investment					$ 8,582
Commercial Real Estate | Non-owner occupied
Troubled Debt Restructurings
Number of Loans | item						1
Pre-Modification Outstanding Recorded Investment						$ 926
Post-Modification Outstanding Recorded Investment						$ 926
Residential Real Estate Loans
Troubled Debt Restructurings
Number of Loans | item					1	1
Pre-Modification Outstanding Recorded Investment					$ 338	$ 644
Post-Modification Outstanding Recorded Investment					$ 338	$ 644
Commercial, industrial and agricultural:
Troubled Debt Restructurings
Number of Loans | item				3	15	10
Pre-Modification Outstanding Recorded Investment				$ 1,138	$ 12,828	$ 7,649
Post-Modification Outstanding Recorded Investment				$ 1,138	12,828	$ 7,649
Taxi medallion loans
Troubled Debt Restructurings
Post-Modification Outstanding Recorded Investment					$ 1,100

LOANS - Collateral Dependent Lo

LOANS - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated loans		$ 26,983
Individually evaluated loans, related allowance for credit losses		4,676
Commercial, industrial and agricultural:
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated loans		21,014
Individually evaluated loans, related allowance for credit losses		$ 4,676
Commercial, industrial and agricultural: | Collateral Dependent Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated loans	$ 9,600
Individually evaluated loans, related allowance for credit losses	6,700
Commercial Real Estate | Collateral Dependent Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated loans	10,800
Individually evaluated loans, related allowance for credit losses	$ 0

LOANS - Impaired Loans (prior t

LOANS - Impaired Loans (prior to the adoption of Topic 326) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
LOANS.
Individually impaired loans		$ 18,424	$ 15,288
Impaired loans	$ 1,138	$ 21,748	$ 9,219

LOANS - Impaired Loans (Details

LOANS - Impaired Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)item
Impaired loans
Post-Modification Outstanding Recorded Investment	$ 1,138	$ 21,748	$ 9,219
Recorded Investment
With no related allowance recorded		15,326	16,634
With an allowance recorded		11,657	2,721
Total impaired loans		26,983	19,355
Unpaid Principal Balance
With no related allowance recorded		15,354	16,644
With an allowance recorded		11,663	2,721
Total impaired loans		27,017	19,365
Related Allocated Allowance
With an allowance recorded		4,676	189
Total impaired loans		4,676	189
Average Recorded Investment
With no related allowance recorded		10,397	12,531
With an allowance recorded		8,027	2,757
Average recorded investment in impaired loans		18,424	15,288
Interest Income Recognized
With no related allowance recorded		569	568
With an allowance recorded		309	91
Total impaired loans		$ 878	$ 659
Other real estate	$ 0
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification | item	1	2	1
Commercial Real Estate | Owner occupied
Impaired loans
Post-Modification Outstanding Recorded Investment		$ 8,582
Recorded Investment
With no related allowance recorded		3,379	$ 268
Total impaired loans		3,379	268
Unpaid Principal Balance
With no related allowance recorded		3,401	278
Total impaired loans		3,401	278
Average Recorded Investment
With no related allowance recorded		1,286	177
Average recorded investment in impaired loans		1,286	177
Interest Income Recognized
With no related allowance recorded		41
Total impaired loans		41
Commercial Real Estate | Non-owner occupied
Impaired loans
Post-Modification Outstanding Recorded Investment			926
Recorded Investment
With no related allowance recorded		2,296	2,816
Total impaired loans		2,296	2,816
Unpaid Principal Balance
With no related allowance recorded		2,296	2,816
Total impaired loans		2,296	2,816
Average Recorded Investment
With no related allowance recorded		2,149	1,583
Average recorded investment in impaired loans		2,149	1,583
Interest Income Recognized
With no related allowance recorded		99	88
Total impaired loans		99	88
Residential Real Estate Loans
Impaired loans
Post-Modification Outstanding Recorded Investment		338	644
Residential Real Estate Loans | Home equity
Recorded Investment
With no related allowance recorded		294
Total impaired loans		294
Unpaid Principal Balance
With no related allowance recorded		300
Total impaired loans		300
Average Recorded Investment
With no related allowance recorded		74
Average recorded investment in impaired loans		74
Residential Real Estate Loans | Secured
Recorded Investment
With no related allowance recorded			8,234
Unpaid Principal Balance
With no related allowance recorded			8,234
Average Recorded Investment
With no related allowance recorded			5,644
Interest Income Recognized
With no related allowance recorded			196
Residential Real Estate Loans | Unsecured
Recorded Investment
With no related allowance recorded			5,316
Unpaid Principal Balance
With no related allowance recorded			5,316
Average Recorded Investment
With no related allowance recorded			5,127
Interest Income Recognized
With no related allowance recorded			284
Commercial, industrial and agricultural:
Impaired loans
Post-Modification Outstanding Recorded Investment	$ 1,138	12,828	7,649
Commercial, industrial and agricultural: | Secured
Recorded Investment
With no related allowance recorded		494
With an allowance recorded		9,612	2,721
Total impaired loans		10,106	10,955
Unpaid Principal Balance
With no related allowance recorded		494
With an allowance recorded		9,612	2,721
Total impaired loans		10,106	10,955
Related Allocated Allowance
With an allowance recorded		3,435	189
Total impaired loans		3,435	189
Average Recorded Investment
With no related allowance recorded		287
With an allowance recorded		6,189	2,757
Average recorded investment in impaired loans		6,476	8,401
Interest Income Recognized
With no related allowance recorded		18
With an allowance recorded		223	91
Total impaired loans		241	287
Commercial, industrial and agricultural: | Unsecured
Recorded Investment
With no related allowance recorded		8,863
With an allowance recorded		2,045
Total impaired loans		10,908	5,316
Unpaid Principal Balance
With no related allowance recorded		8,863
With an allowance recorded		2,051
Total impaired loans		10,914	5,316
Related Allocated Allowance
With an allowance recorded		1,241
Total impaired loans		1,241
Average Recorded Investment
With no related allowance recorded		6,601
With an allowance recorded		1,838
Average recorded investment in impaired loans		8,439	5,127
Interest Income Recognized
With no related allowance recorded		411
With an allowance recorded		86
Total impaired loans		497	$ 284
Taxi medallion loans
Impaired loans
Post-Modification Outstanding Recorded Investment		1,100
Non-recurring basis
Recorded Investment
With an allowance recorded	9,600	11,700
Related Allocated Allowance
With an allowance recorded	6,700	4,700
Non-recurring basis | Carrying Amount
Related Allocated Allowance
With an allowance recorded	2,900	0
Non-recurring basis | Carrying Amount | Other real estate owned
Interest Income Recognized
Other real estate	$ 0	$ 0

LOANS - Related Party Loans (De

LOANS - Related Party Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Selected information about related party loans
Balance at beginning of period	$ 12,349
New loans	724
Repayments	(1,575)
Balance at end of period	$ 11,498

LOANS - Changes in the Allowanc

LOANS - Changes in the Allowance for Loan 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
Allowance for Loan Losses
Beginning balance				$ 32,786				$ 31,418	$ 32,786	$ 31,418	$ 31,707
Charge-offs									(2,012)	(4,482)	(2,841)
Recoveries									301	150	752
Provision for credit losses	$ 500	$ 1,500	$ 4,500	5,000	$ 600	$ 1,000	$ 3,500	600	11,500	5,700	1,800
Ending balance	44,200				32,786				44,200	32,786	31,418
Commercial Real Estate | Mortgage loans
Allowance for Loan Losses
Beginning balance				12,150				10,792	12,150	10,792	11,048
Charge-offs									(1)	(3,670)
Recoveries										1
Provision for credit losses									4,097	5,027	(256)
Ending balance	8,534				12,150				8,534	12,150	10,792
Multi-family
Allowance for Loan Losses
Beginning balance				4,829				2,566	4,829	2,566	4,521
Provision for credit losses									496	2,263	(1,955)
Ending balance	1,736				4,829				1,736	4,829	2,566
Residential Real Estate Loans | Mortgage loans
Allowance for Loan Losses
Beginning balance				1,882				3,935	1,882	3,935	2,438
Charge-offs											(24)
Recoveries									3	112	3
Provision for credit losses									(1,005)	(2,165)	1,518
Ending balance	3,062				1,882				3,062	1,882	3,935
Commercial, industrial and agricultural:
Allowance for Loan Losses
Beginning balance				12,583				12,722	12,583	12,722	12,838
Charge-offs									(2,004)	(799)	(2,806)
Recoveries									298	25	747
Provision for credit losses									7,787	635	1,943
Ending balance	27,363				12,583				27,363	12,583	12,722
Real estate construction and land loans
Allowance for Loan Losses
Beginning balance				1,066				1,297	1,066	1,297	740
Provision for credit losses									(165)	(231)	557
Ending balance	2,175				1,066				2,175	1,066	1,297
Installment/consumer loans
Allowance for Loan Losses
Beginning balance				$ 276				$ 106	276	106	122
Charge-offs									(7)	(13)	(11)
Recoveries										12	2
Provision for credit losses									290	171	(7)
Ending balance	1,330				$ 276				1,330	$ 276	$ 106
Effect of adoption | ASU 2016-13
Allowance for Loan Losses
Ending balance	1,625								1,625
Effect of adoption | Commercial Real Estate | Mortgage loans | ASU 2016-13
Allowance for Loan Losses
Ending balance	(7,712)								(7,712)
Effect of adoption | Multi-family | ASU 2016-13
Allowance for Loan Losses
Ending balance	(3,589)								(3,589)
Effect of adoption | Residential Real Estate Loans | Mortgage loans | ASU 2016-13
Allowance for Loan Losses
Ending balance	2,182								2,182
Effect of adoption | Commercial, industrial and agricultural: | ASU 2016-13
Allowance for Loan Losses
Ending balance	8,699								8,699
Effect of adoption | Real estate construction and land loans | ASU 2016-13
Allowance for Loan Losses
Ending balance	1,274								1,274
Effect of adoption | Installment/consumer loans | ASU 2016-13
Allowance for Loan Losses
Ending balance	$ 771								$ 771

LOANS - Balances in Allowance f

LOANS - Balances in Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Individually evaluated for impairment		$ 4,676
Collectively evaluated for impairment		28,110
Total Allowance for Loan Losses	$ 44,200	32,786	$ 31,418	$ 31,707
Loans:
Individually evaluated for impairment		26,983
Collectively evaluated for impairment		3,645,270
Loans acquired with deteriorated credit quality		343
Total Loans	4,605,583	3,672,596
Commercial Real Estate | Mortgage loans
Allowance for Loan Losses:
Collectively evaluated for impairment		12,150
Total Allowance for Loan Losses	8,534	12,150	10,792	11,048
Loans:
Individually evaluated for impairment		5,675
Collectively evaluated for impairment		1,560,012
Total Loans		1,565,687
Multi-family
Allowance for Loan Losses:
Collectively evaluated for impairment		4,829
Total Allowance for Loan Losses	1,736	4,829	2,566	4,521
Loans:
Collectively evaluated for impairment		812,174
Total Loans		812,174
Multi-family | Mortgage loans
Loans:
Total Loans	899,730	812,174
Residential Real Estate Loans
Loans:
Total Loans	434,689	493,144
Residential Real Estate Loans | Mortgage loans
Allowance for Loan Losses:
Collectively evaluated for impairment		1,882
Total Allowance for Loan Losses	3,062	1,882	3,935	2,438
Loans:
Individually evaluated for impairment		294
Collectively evaluated for impairment		492,507
Loans acquired with deteriorated credit quality		343
Total Loans	434,689	493,144
Commercial, industrial and agricultural:
Allowance for Loan Losses:
Individually evaluated for impairment		4,676
Collectively evaluated for impairment		7,907
Total Allowance for Loan Losses	27,363	12,583	12,722	12,838
Loans:
Individually evaluated for impairment		21,014
Collectively evaluated for impairment		658,430
Total Loans	1,527,147	679,444
Real estate construction and land loans
Allowance for Loan Losses:
Collectively evaluated for impairment		1,066
Total Allowance for Loan Losses	2,175	1,066	1,297	740
Loans:
Collectively evaluated for impairment		97,311
Total Loans	82,479	97,311
Installment/consumer loans
Allowance for Loan Losses:
Collectively evaluated for impairment		276
Total Allowance for Loan Losses	1,330	276	$ 106	$ 122
Loans:
Collectively evaluated for impairment		24,836
Total Loans	$ 23,019	$ 24,836

PREMISES AND EQUIPMENT, NET - C

PREMISES AND EQUIPMENT, NET - Components of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
PREMISES AND EQUIPMENT, NET
Land	$ 7,896	$ 7,896
Building and improvements	17,391	17,271
Furniture, fixtures and equipment	28,682	25,288
Leasehold improvements	13,355	12,356
Premises and equipment, gross	67,324	62,811
Accumulated depreciation and amortization	(32,452)	(28,749)
Total premises and equipment, net	$ 34,872	$ 34,062

PREMISES AND EQUIPMENT, NET - D

PREMISES AND EQUIPMENT, NET - Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PREMISES AND EQUIPMENT, NET
Depreciation and amortization of premises and equipment	$ 4,319	$ 4,253	$ 3,822

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease cost
Operating lease cost	$ 7,643	$ 7,038
Sublease income	(37)	(95)
Total lease cost	7,606	6,943
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	7,363	7,019
Operating right-of-use assets obtained in exchange for lease liabilities	$ 7,843	$ 48,101
Weighted-average remaining lease term-operating leases	7 years 7 months 6 days	7 years 9 months 18 days
Weighted-average discount rate-operating leases	2.91%	3.20%
Renewal options	true
Minimum
Lease cost
Renewal term	5 years
Maximum
Lease cost
Renewal term	10 years

LEASES - Maturities of operatin

LEASES - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Maturities of operating lease liabilities
2021	$ 7,387
2022	7,260
2023	6,548
2024	6,297
2025	6,177
Thereafter	18,649
Total operating lease payments	52,318
Less: Interest	(5,605)
Present value of operating lease liabilities	$ 46,713	$ 45,977

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)
Goodwill
Goodwill carrying amount	$ 105,950	$ 105,950
Number of reporting unit | item	1
Core deposit intangibles, a trademark, and servicing assets	$ 1,700	$ 1,300

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquired intangible assets:
Aggregate amortization expense	$ 700	$ 800	$ 900
Intangible assets
Carrying amount of the Company's trademark	259	259
Acquired intangible assets
Acquired intangible assets:
Gross Carrying Amount	7,470	7,470
Aggregate amortization expense	5,769	5,113
Core deposit intangibles
Acquired intangible assets:
Gross Carrying Amount	7,211	7,211
Aggregate amortization expense	5,769	5,113
Trademark
Acquired intangible assets:
Gross Carrying Amount	$ 259	$ 259

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense for Next Five Years (Details) $ in Thousands	Dec. 31, 2020USD ($)
GOODWILL AND OTHER INTANGIBLE ASSETS
2021	$ 530
2022	413
2023	281
2024	164
2025	54
Total	$ 1,442

DEPOSITS (Details)

DEPOSITS (Details) $ in Thousands	Dec. 31, 2020USD ($)
DEPOSITS
2021	$ 238,117
2022	26,702
2023	14,258
2024	4,897
2025	4,265
Thereafter	206
Time Deposits, Total	$ 288,445

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Time deposits
Deposits from principal officers, directors and their affiliates	$ 25	$ 16.7
$250,000 or Greater
Time deposits
Deposits in excess of the FDIC limit	$ 121.8	$ 129.6

SECURITIES SOLD UNDER AGREEME_3

SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - Securities sold under agreement to repurchase - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Securities sold under agreements to repurchase
Average daily balance during the year	$ 1,529	$ 849
Average interest rate during the year (as a percent)	0.05%	0.05%
Maximum month-end balance during the year	$ 1,943	$ 1,037
Weighted average interest rate at year-end (as a percent)	0.05%	0.05%

SECURITIES SOLD UNDER AGREEME_4

SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities sold under agreements to repurchase
Repurchase agreements	$ 1,223	$ 999
Carrying amount of U.S. GSE residential collateralized mortgage obligations and U.S. GSE residential mortgage-backed securities	2,200	$ 2,100
First quarter of 2021
Securities sold under agreements to repurchase
Repurchase agreements	$ 1,200
U.S. GSE residential collateralized mortgage obligations
Securities sold under agreements to repurchase
Percentage of investment securities held as collateral	34.00%	17.00%
U.S. GSE residential mortgage-backed securities
Securities sold under agreements to repurchase
Percentage of investment securities held as collateral	66.00%	83.00%

FEDERAL HOME LOAN BANK ADVANC_3

FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
FEDERAL HOME LOAN BANK ADVANCES.
Average daily balance during the year	$ 284,719	$ 245,283
Average interest rate during the year (as a percent)	1.40%	1.86%
Maximum month-end balance during the year	$ 340,000	$ 435,000
Weighted average interest rate at year-end (as a percent)	0.35%	1.82%

FEDERAL HOME LOAN BANK ADVANC_4

FEDERAL HOME LOAN BANK ADVANCES - Contractual Maturities and Weighted Average Interest Rates of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Contractual Maturity, Amount
Overnight		$ 195,000
Due within a year	$ 215,000	240,000
Total FHLB advances	$ 215,000	$ 435,000
Weighted Average Rate
Overnight (as a percent)		1.81%
Weighted Average Rate (as a percent)	0.35%	1.84%
Weighted Average Rate for total FHLB advances (as a percent)	0.35%	1.82%

FEDERAL HOME LOAN BANK ADVANC_5

FEDERAL HOME LOAN BANK ADVANCES - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2020	Dec. 31, 2019
FEDERAL HOME LOAN BANK ADVANCES.
Advances collateralized amount	$ 1.7	$ 1.4
Maximum borrowing amount from FHLB term advances	1.9
FHLB advances with contractual maturities after 2021	$ 0

SUBORDINATED DEBENTURES (Detail

SUBORDINATED DEBENTURES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Fixed-to-floating rate subordinated debentures	$ 80,000	$ 80,000
Subordinated debentures, net			$ 79,059	$ 78,920
Subordinated Debentures | Callable Notes After Five Years
Debt Instrument [Line Items]
Fixed-to-floating rate subordinated debentures	$ 40,000	$ 40,000
Debt Instrument, Term	5 years
Fixed annual interest rate	5.25%	5.25%
Debt instrument variable rate description		three-month LIBOR
Basis points		3.60%
Subordinated Debentures | Callable Notes After Ten Years
Debt Instrument [Line Items]
Fixed-to-floating rate subordinated debentures	$ 40,000	$ 40,000
Debt Instrument, Term	10 years
Fixed annual interest rate	5.75%	5.75%
Debt instrument variable rate description		three-month LIBOR
Basis points		3.45%

DERIVATIVES - Interest Rate Swa

DERIVATIVES - Interest Rate Swaps Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives
Notional amounts	$ 1,100,000	$ 823,900
Interest rate swaps | Derivative designated as a cash flow hedge
Derivatives
Notional amounts	$ 280,000	$ 290,000
Weighted average pay rates (as a percent)	1.33%	1.84%
Weighted average receive rates (as a percent)	0.23%	1.94%
Weighted average maturity	3 years 1 month 20 days	2 years 10 months 28 days

DERIVATIVES - Narrative (Detail

DERIVATIVES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Derivative [Line Items]
Notional amounts	$ 1,100,000	$ 823,900
Derivative liability position net	0
Derivative asset position net	57,100
Collateral received against obligations in net asset position	57,900
Collateral posted in net liability position	0
Derivative designated as a cash flow hedge | Amount Reclassified from Accumulated Other Comprehensiven (loss) Income
Derivative [Line Items]
Accelerated reclassification, loss from other comprehensive income to earnings as a result of the hedged forecasted transactions becoming probable not to occur	3,400
Interest rate swaps | Derivative designated as a cash flow hedge
Derivative [Line Items]
Notional amounts	280,000	290,000
Notional amount terminated	$ 125,000
Derivative, number of terminations | contract	4
Loss on termination of swaps, reported in non-interest income	$ 3,400
Interest income (expense) on derivative	1,700	$ 1,600	$ 1,100
Interest rate swaps | Derivative designated as a cash flow hedge | Federal Home Loan Bank of New York
Derivative [Line Items]
Reclassified as an increase to interest expense during the next twelve months	2,100
Interest rate swaps | Derivative designated as a cash flow hedge | Federal Home Loan Bank of New York | Amount Reclassified from Accumulated Other Comprehensiven (loss) Income
Derivative [Line Items]
Increase to interest expense	$ 1,700

DERIVATIVES - Net Gains (Losses

DERIVATIVES - Net Gains (Losses) Relating to the Cash Flow Derivative Instruments (Details) - Derivative designated as a cash flow hedge - Interest rate swaps - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net gains (losses) recorded in accumulated other comprehensive income and the Consolidated Statements of Income
Interest rate contracts, Amount of (loss) gain recognized in OCI included component	$ (10,455)	$ (3,601)	$ 2,493
Interest rate contracts, Amount of gain (loss) reclassified from Accumulated OCI into income included component	$ (5,016)	$ 1,588	$ 1,068

DERIVATIVES - Cash Flow Hedges

DERIVATIVES - Cash Flow Hedges included in the Consolidated Balance Sheets (Details) - Derivative designated as a cash flow hedge - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Interest rate swaps | Federal Home Loan Bank of New York | Forward contract
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 65,000	$ 50,000
Fair Value Asset	11
Fair Value Liability	(222)	(1,427)
Interest rate swaps related to FHLB advances
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	215,000	240,000
Fair Value Asset		1,233
Fair Value Liability	$ (6,651)	$ (978)

DERIVATIVES - Non-Designated He

DERIVATIVES - Non-Designated Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives
Notional amounts	$ 1,100,000	$ 823,900
Loan Swap Fees	3,742	7,460	$ 716
Loan customers
Derivatives
Notional amounts	548,500	411,900
Bank counterparties
Derivatives
Notional amounts	548,500	411,900
Interest rate swaps | Non-Designated Hedges
Derivatives
Notional amounts	$ 1,097,100	$ 823,894
Weighted average pay rates (as a percent)	2.94%	3.75%
Weighted average receive rates (as a percent)	2.94%	3.75%
Weighted average maturity	10 years 7 days	10 years 9 months 7 days
Fair value of combined interest rate swaps	$ 0	$ 0

INCOME TAXES - Components (Deta

INCOME TAXES - Components (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									$ 16,262	$ 12,665	$ 5,270
State									1,457	639	1,023
Total current									17,719	13,304	6,293
Deferred:
Federal									(3,782)	(419)	3,299
State									(252)	1,175	(451)
Total deferred									(4,034)	756	2,848
Total income tax expense	$ 3,881	$ 3,999	$ 3,129	$ 2,676	$ 3,934	$ 3,852	$ 2,859	$ 3,415	$ 13,685	$ 14,060	$ 9,141

INCOME TAXES - Reconciliation (

INCOME TAXES - Reconciliation (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
Amount
Federal income tax expense computed by applying the statutory rate to income before income taxes									$ 11,703	$ 13,808	$ 10,157
Tax exempt interest									(851)	(920)	(1,002)
State taxes, net of federal income tax benefit									1,214	1,425	1,999
Other									1,619	(253)	(2,013)
Total income tax expense	$ 3,881	$ 3,999	$ 3,129	$ 2,676	$ 3,934	$ 3,852	$ 2,859	$ 3,415	$ 13,685	$ 14,060	$ 9,141
Percentage of Pre-tax Earnings
Federal income tax expense computed by applying the statutory rate to income before income taxes (as a percent)									21.00%	21.00%	21.00%
Tax exempt interest (as a percent)									(1.00%)	(1.00%)	(2.00%)
State taxes, net of federal income tax benefit (as a percent)									2.00%	2.00%	4.00%
Other (as a percent)									3.00%	(1.00%)	(4.00%)
Income tax expense (as a percent)									25.00%	21.00%	19.00%

INCOME TAXES - Deferred Tax Ass

INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for credit losses and off-balance sheet credit exposure	$ 13,983	$ 10,305
Net unrealized losses on securities		343
Compensation and related benefit obligations	1,674	2,368
Net deferred loan costs and fees	2,588
Purchase accounting fair value adjustments	3,574	4,735
Net change in pension and other post-retirement benefits plans	3,608	2,809
Net operating loss carryforward	786	3,229
Net loss on cash flow hedges	1,905	304
Operating lease liabilities	13,684	13,444
Other	1,234	200
Total deferred tax assets	43,036	37,737
Deferred tax liabilities:
Pension and SERP expense	(5,366)	(4,904)
Net unrealized gains on securities	(1,285)
Depreciation	(546)	(956)
REIT undistributed net income	(3,178)	(2,403)
Net deferred loan costs and fees		(2,413)
State and local taxes	(1,345)	(1,227)
Operating lease right-of-use assets	(13,172)	(12,934)
Other	(970)	(835)
Total deferred tax liabilities	(25,862)	(25,672)
Net deferred tax asset	$ 17,174	$ 12,065

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) $ in Millions	Dec. 31, 2020USD ($)
Operating Loss Carryforwards [Line Items]
NOL carryforward	$ 2.9
New York State Division of Taxation and Finance | CNB
Operating Loss Carryforwards [Line Items]
NOL carryforward	2.1
New York City Division Of Taxation | CNB
Operating Loss Carryforwards [Line Items]
NOL carryforward	$ 0

PENSION AND OTHER POSTRETIREM_3

PENSION AND OTHER POSTRETIREMENT PLANS - Changes in Obligations and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	$ 28,757	$ 23,611
Service cost	940	952	$ 1,106
Interest cost	794	908	794
Benefits paid and expected expenses	(609)	(475)
Assumption changes and other	3,865	3,761
Benefit obligation at end of year	33,747	28,757	23,611
Change in plan assets:
Fair value of plan assets at beginning of year	39,745	33,874
Actual return on plan assets	3,764	6,346
Employer contribution to the plan	1,160
Benefits paid and actual expenses	(609)	(475)
Fair value of plan assets at end of year	44,060	39,745	33,874
Funded status at end of year	10,313	10,988
SERP Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	5,323	3,811
Service cost	371	261	290
Interest cost	149	147	127
Benefits paid and expected expenses	(112)	(112)
Assumption changes and other	238	1,216
Benefit obligation at end of year	5,969	5,323	$ 3,811
Change in plan assets:
Fair value of plan assets at beginning of year	0
Actual return on plan assets	0	0
Employer contribution to the plan	112	112
Benefits paid and actual expenses	(112)	(112)
Fair value of plan assets at end of year	0	0
Funded status at end of year	$ (5,969)	$ (5,323)

PENSION AND OTHER POSTRETIREM_4

PENSION AND OTHER POSTRETIREMENT PLANS - Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in accumulated other comprehensive income
Net amount recognized	$ 8,640	$ 6,775
Pension Benefits
Amounts recognized in accumulated other comprehensive income
Net actuarial loss	10,572	7,997
Prior service cost	(408)	(484)
Net amount recognized	10,164	7,513
SERP Benefits
Amounts recognized in accumulated other comprehensive income
Net actuarial loss	2,083	2,071
Prior service cost	0	0
Net amount recognized	$ 2,083	$ 2,071

PENSION AND POSTRETIREMENT PLAN

PENSION AND POSTRETIREMENT PLANS - Components of Net Periodic Benefit Cost (Credit) - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:
Service cost	$ 940	$ 952	$ 1,106
Interest cost	794	908	794
Expected return on plan assets	(2,905)	(2,445)	(2,547)
Amortization of net loss	431	494	335
Amortization of prior service credit	(77)	(77)	(77)
Amortization of transition obligation	0	0	0
Net periodic benefit (credit) cost	(817)	(168)	(389)
SERP Benefits
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:
Service cost	371	261	290
Interest cost	149	147	127
Expected return on plan assets	0	0	0
Amortization of net loss	227	70	121
Amortization of prior service credit	0	0	0
Amortization of transition obligation	0	0	5
Net periodic benefit (credit) cost	$ 747	$ 478	$ 543

PENSION AND POSTRETIREMENT PL_2

PENSION AND POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Contribution to the plan	$ 112	$ 112

PENSION AND OTHER POSTRETIREM_5

PENSION AND OTHER POSTRETIREMENT PLANS - Components of Net Periodic Benefit (Credit) Cost and Other Amounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:
Total recognized in other comprehensive income	$ 3,245	$ 1,076	$ 1,567
Pension Benefits
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:
Service cost	940	952	1,106
Interest cost	794	908	794
Expected return on plan assets	(2,905)	(2,445)	(2,547)
Amortization of net loss	431	494	335
Amortization of prior service credit	(77)	(77)	(77)
Amortization of transition obligation	0	0	0
Net periodic benefit (credit) cost	(817)	(168)	(389)
Net loss (gain)	3,006	(140)	1,980
Amortization of net loss	(431)	(494)	(335)
Amortization of prior service credit	77	77	77
Amortization of transition obligation	0	0	0
Total recognized in other comprehensive income	2,652	(557)	1,722
SERP Benefits
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:
Service cost	371	261	290
Interest cost	149	147	127
Expected return on plan assets	0	0	0
Amortization of net loss	227	70	121
Amortization of prior service credit	0	0	0
Amortization of transition obligation	0	0	5
Net periodic benefit (credit) cost	747	478	543
Net loss (gain)	239	1,216	(413)
Amortization of net loss	(227)	(70)	(121)
Amortization of prior service credit	0	0	0
Amortization of transition obligation	0	0	(5)
Total recognized in other comprehensive income	$ 12	$ 1,146	$ (539)

PENSION AND OTHER POSTRETIREM_6

PENSION AND OTHER POSTRETIREMENT PLANS - Expected Long-Term Rate-of-Return (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Weighted average assumptions used to determine benefit obligations:
Discount rate (as a percent)	2.33%	3.10%	4.14%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (as a percent)	3.10%	4.14%	3.52%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Expected long-term rate of return (as a percent)	7.25%	7.25%	7.25%
SERP Benefits
Weighted average assumptions used to determine benefit obligations:
Discount rate (as a percent)	2.28%	3.08%	4.13%
Rate of compensation increase (as a percent)		5.00%	5.00%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (as a percent)	3.08%	4.13%	3.50%
Rate of compensation increase (as a percent)		5.00%	5.00%
Expected long-term rate of return (as a percent)	0.00%	0.00%	0.00%

PENSION AND OTHER POSTRETIREM_7

PENSION AND OTHER POSTRETIREMENT PLANS - Target Allocations for Plan Assets (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Target allocations for Plan assets
Percentage of Plan Assets	100.00%	100.00%
Cash and cash equivalents
Target allocations for Plan assets
Percentage of Plan Assets	5.60%	3.60%
Weighted-Average Expected Long-term Rate of Return (as a percent)	0.00%
Cash and cash equivalents | Minimum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	0.00%
Cash and cash equivalents | Maximum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	5.00%
Equity Securities
Target allocations for Plan assets
Percentage of Plan Assets	56.80%	57.90%
Weighted-Average Expected Long-term Rate of Return (as a percent)	9.50%
Equity Securities | Minimum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	45.00%
Equity Securities | Maximum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	65.00%
Fixed income securities
Target allocations for Plan assets
Percentage of Plan Assets	37.60%	38.50%
Weighted-Average Expected Long-term Rate of Return (as a percent)	5.00%
Fixed income securities | Minimum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	30.00%
Fixed income securities | Maximum
Target allocations for Plan assets
Target Allocation 2021 (as a percent)	50.00%

PENSION AND OTHER POSTRETIREM_8

PENSION AND OTHER POSTRETIREMENT PLANS - Financial Assets Measured At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Employee benefits
Total plan assets	$ 44,060	$ 39,745	$ 33,874
Carrying Amount | Recurring basis
Employee benefits
Total plan assets	44,060	39,745
Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	26,876	25,050
Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	17,184	14,695
Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Cash and cash equivalents | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	2,452	1,444
Cash and cash equivalents | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	0	0
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	2,452	1,444
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Equity Securities | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	25,023	23,026
Equity Securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	25,023	23,026
Equity Securities | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
Equity Securities | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
U.S. large cap | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	15,449	12,097
U.S. large cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	15,449	12,097
U.S. large cap | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
U.S. large cap | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
U.S. Mid cap/small cap | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	3,471	4,195
U.S. Mid cap/small cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	3,471	4,195
U.S. Mid cap/small cap | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
U.S. Mid cap/small cap | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
International | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	6,029	6,320
International | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	6,029	6,320
International | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
International | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Equities blend | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	74	414
Equities blend | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	74	414
Equities blend | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
Equities blend | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Fixed income securities | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	16,585	15,275
Fixed income securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	1,853	2,024
Fixed income securities | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	14,732	13,251
Fixed income securities | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Corporate | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	1,853	2,024
Corporate | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	1,853	2,024
Corporate | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	0	0
Corporate | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Government | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	2,342	2,926
Government | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	0	0
Government | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	2,342	2,926
Government | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
Mortgage-backed | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	2,325	1,033
Mortgage-backed | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	0	0
Mortgage-backed | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	2,325	1,033
Mortgage-backed | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	0	0
High yield bonds and bond funds | Carrying Amount | Recurring basis
Employee benefits
Total plan assets	10,065	9,292
High yield bonds and bond funds | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis
Employee benefits
Total plan assets	0	0
High yield bonds and bond funds | Significant Other Observable Inputs (Level 2) | Recurring basis
Employee benefits
Total plan assets	10,065	9,292
High yield bonds and bond funds | Significant Unobservable Inputs (Level 3) | Recurring basis
Employee benefits
Total plan assets	$ 0	$ 0

PENSION AND OTHER POSTRETIREM_9

PENSION AND OTHER POSTRETIREMENT PLANS - Benefits Expected to be Paid (Details) $ in Thousands	Dec. 31, 2020USD ($)
Estimated future Pension Plan and SERP payments
2021	$ 1,093
2022	1,180
2023	1,315
2024	1,318
2025	1,395
2026-2030	$ 10,228

PENSION AND OTHER POSTRETIRE_10

PENSION AND OTHER POSTRETIREMENT PLANS - 401k Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PENSION AND OTHER POSTRETIREMENT PLANS.
Participants contribution	$ 19,500
Description of Defined Contribution Pension and Other Postretirement Plans	100% of each employee’s contributions up to 1% of each employee’s compensation plus 50% of each employee’s contributions over 1% but not in excess of 6% of each employee’s compensation for a maximum contribution of 3.5% of a participating employee’s compensation
Minimum employee contribution percentage	1.00%
Percentage of employer matching contribution	50.00%
Threshold limit percentage of employee compensation	6.00%
Maximum percentage of annual contribution per employee	3.50%
Cash contributions by the Bank	$ 1,400,000	$ 1,100,000	$ 1,000,000
Discretionary profit sharing contribution	$ 546,000	$ 583,000	$ 497,000

PENSION AND OTHER POSTRETIRE_11

PENSION AND OTHER POSTRETIREMENT PLANS - Additional Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Investments for long-term growth (as a percent)	97.00%
Investments for near-term benefit payments (as a percent)	3.00%
Cumulative historical returns for the S&P 500 index (as a percent)	9.50%
Cumulative historical returns for the long term corporate bonds (as a percent)	5.00%
Pension Benefits
Employee benefits
Accumulated benefit obligation	$ 32,300	$ 27,400
Amortization from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year
Estimated net loss	650
Estimated prior service credit	77
SERP Benefits
Employee benefits
Accumulated benefit obligation	6,000	$ 3,600
Amortization from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year
Estimated net loss	$ 257

STOCK BASED COMPENSATION PLANS

STOCK BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		69,360
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 425	$ 197	$ 91
Unrecognized compensation cost related to unvested stock options		$ 201
Cost is expected to be recognized period		1 month 6 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted		91,428
Number of restricted stock awards unvested		89,043	293,717
Directors | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		1 year
Deferred compensation expense		$ 553	$ 570	560
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	0
2012 Plan | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		5,100	$ 2,200	$ 2,400
Number of restricted stock awards granted			78,952	83,782
Total fair value of shares vested		8,800	$ 2,500	$ 1,500
Unrecognized compensation cost related to non-vested RSAs		$ 2,200
Cost is expected to be recognized period		1 month 6 days
2012 Plan | Restricted stock | Five year specified vesting schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted		57,850	49,925	44,750
Vesting period (in years)		5 years		5 years
Year in vesting schedule in which one-third of the awards vest, period one			5 years
2012 Plan | Restricted stock | Three year specified vesting schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			29,027	13,915
Vesting period (in years)				3 years
Year in vesting schedule in which one-third of the awards vest, period one			3 years
2012 Plan | Restricted stock | Three year ratable vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted		33,578
Vesting period (in years)		3 years
2012 Plan | Restricted stock | Two year ratable vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			25,117
Vesting period (in years)			2 years
LTI Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 1,600	$ 693	$ 462
Number of restricted stock awards granted		26,556
Number of restricted stock awards unvested		38,275	85,342
Unrecognized compensation cost related to non-vested RSAs		$ 600
Cost is expected to be recognized period		1 month 6 days
LTI Plan | Restricted stock units | Time-vested RSAs vest ratably over five years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted		17,943
Vesting period (in years)		3 years
LTI Plan | Restricted stock units | Performance-based RSAs vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted		8,613
Vesting period (in years)		3 years
LTI Plan | NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		69,360	63,267	47,393
Percentage premium over the grant date stock price		10.00%	10.00%	10.00%
Vesting period (in years)		3 years	3 years	3 years
Weighted-average grant-date fair value		$ 4.10	$ 5.05	$ 6.52
Method used		Black-Scholes option-pricing model
LTI Plan | NEOs | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			22,305
LTI Plan | NEOs | Restricted stock units | Time-vested RSAs vest ratably over five years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			13,255
Vesting period (in years)			5 years
LTI Plan | NEOs | Restricted stock units | Performance-based RSAs vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			9,050
Vesting period (in years)			3 years

STOCK BASED COMPENSATION PLAN_2

STOCK BASED COMPENSATION PLANS - Incentive Plans (Details) - shares	1 Months Ended	12 Months Ended
	May 31, 2019	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted and distributed (in shares)		69,360
Common Stock, Capital Shares Reserved for Future Issuance		436,953
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted and distributed (in shares)	0
Share Based Compensation Arrangement By Share Based Payment Award Number Of Remaining Shares Available For Grant		162,738
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	370,000
Shares available for grant		370,000

STOCK-BASED COMPENSATION PLAN_2

STOCK-BASED COMPENSATION PLANS - Schedule of Share Based Compensation Arrangement By Share Based Payment Award Grants in Period Fair Value Assumptions (Details) - LTI Plan - NEOs	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	3.03%	2.86%	2.80%
Expected volatility rate	23.11%	23.80%	27.53%
Risk-free interest rate	1.47%	2.52%	2.67%
Expected option life	6 years	6 years	6 years 6 months

STOCK BASED COMPENSATION PLAN_3

STOCK BASED COMPENSATION PLANS - Status of Company's Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares
Number of Options
Outstanding, January 1, 2020 | shares	110,660
Granted | shares	69,360
Outstanding, December 31, 2020 | shares	180,020
Vested and Exercisable, December 31, 2020 | shares	110,660
Weighted Average Exercise Price
Weighted Average Exercise Price, January 1, 2020 | $ / shares	$ 35.71
Granted | $ / shares	34.87
Weighted Average Exercise Price, December 31, 2020 | $ / shares	35.39
Vested and Exercisable, December 31, 2020 | $ / shares	$ 35.71
Weighted Average Remaining Contractual Life, Outstanding	8 years 2 months 12 days
Weighted Average Remaining Contractual Life, Vested and Exercisable	7 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $	$ 0
Aggregate Intrinsic Value, Vested and Exercisable | $	$ 0

STOCK BASED COMPENSATION PLAN_4

STOCK BASED COMPENSATION PLANS - Exercise Prices (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	180,020	110,660
Exercise Price	$ 35.39	$ 35.71
$34.87
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	69,360
Exercise Price	$ 34.87
$35.35
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	63,267
Exercise Price	$ 35.35
36.19
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	47,393
Exercise Price	$ 36.19

STOCK BASED COMPENSATION PLAN_5

STOCK BASED COMPENSATION PLANS - Restricted Stock Awards (Details) - Restricted stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Unvested, January 1, 2020	293,717
Granted	91,428
Vested	(289,509)
Forfeited	(6,593)
Unvested, December 31, 2020	89,043	293,717
Weighted Average Grant-Date Fair Value
Unvested, January 1, 2020	$ 30.37
Granted	31.02
Vested	30.34
Forfeited	32.16
Unvested, December 31, 2020	$ 31	$ 30.37
2012 Plan
Shares
Granted		78,952	83,782

STOCK BASED COMPENSATION PLAN_6

STOCK BASED COMPENSATION PLANS - Restricted Stock Units (Details) - LTI Plan - Restricted stock units	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Shares
Unvested, January 1, 2020 | shares	85,342
Granted | shares	26,556
Reinvested dividends | shares	4,491
Added by performance factor | shares	605
Forfeited | shares	(6,623)
Vested | shares	(72,096)
Unvested, December 31, 2020 | shares	38,275
Weighted Average Grant-Date Fair Value
Unvested, January 1, 2020 | $ / shares	$ 29.59
Granted | $ / shares	32.13
Reinvested dividends | $ / shares	30.08
Added by performance factor | $ / shares	33.69
Forfeited | $ / shares	28.68
Vested | $ / shares	29.10
Unvested, December 31, 2020 | $ / shares	$ 32.57

STOCK BASED COMPENSATION PLAN_7

STOCK BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
STOCK-BASED COMPENSATION PLANS.
Common stock initially authorized for issuance under the ESPP, Shares	1,000,000
Maximum contribution from employees	$ 25,000
Shares of common stock purchased under the ESPP		11,413	7,888	3,758
Expense recorded related to ESPP		$ 0	$ 0	$ 0

EARNINGS PER SHARE - Computatio

EARNINGS PER SHARE - Computation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
EARNINGS PER SHARE.
Net income	$ 8,977	$ 13,061	$ 10,656	$ 9,348	$ 14,208	$ 13,903	$ 10,653	$ 12,927	$ 42,042	$ 51,691	$ 39,227
Dividends paid on and earnings allocated to participating securities									(872)	(1,096)	(853)
Income attributable to common stock									$ 41,170	$ 50,595	$ 38,374
Weighted average common shares outstanding, including participating securities									19,903	19,952	19,875
Weighted average participating securities (in shares)									(409)	(424)	(434)
Weighted average common shares outstanding									19,494	19,528	19,441
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.66	$ 0.54	$ 0.47	$ 0.71	$ 0.70	$ 0.53	$ 0.65	$ 2.11	$ 2.59	$ 1.97
Income attributable to common stock									$ 41,170	$ 50,595	$ 38,374
Weighted average common shares outstanding									19,494	19,528	19,441
Incremental shares from assumed conversions of options and restricted stock units									55	31	27
Weighted average common and equivalent shares outstanding (in shares)									19,549	19,559	19,468
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.66	$ 0.54	$ 0.47	$ 0.71	$ 0.70	$ 0.53	$ 0.65	$ 2.11	$ 2.59	$ 1.97

EARNINGS PER SHARE - Narrative

EARNINGS PER SHARE - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	180,020	110,660	47,393
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	8,941	0	3,156

COMMITMENTS AND CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Commitments Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments outstanding
Total commitments outstanding	$ 984,312	$ 814,908
Standby letters of credit
Commitments outstanding
Total commitments outstanding	25,501	23,670
Loan commitments outstanding
Commitments outstanding
Total commitments outstanding	150,515	117,044
Unused lines of credit
Commitments outstanding
Total commitments outstanding	$ 808,296	$ 674,194

COMMITMENTS AND CONTINGENCIES_4

COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Fixed Rate Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments outstanding	$ 984,312	$ 814,908
Fixed rate loan commitments outstanding	5,100	5,900
Variable rate loan commitments outstanding	145,400	111,100
Loan commitments outstanding
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments outstanding	$ 150,515	$ 117,044

COMMITMENTS AND CONTINGENCIES_5

COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Narrative (Details) - BNB Bank (Bank) $ in Millions	Dec. 31, 2020USD ($)
Commitments and Contingencies [Line Items]
Average balance maintained	$ 342.4
Lines of credit with unaffiliated correspondent banks to provide short-term credit	418
Amount available for transactions under Master Repurchase Agreement	1,900
Federal Home Loan Bank Advances
Commitments and Contingencies [Line Items]
Lines of credit available on an unsecured basis	398
Federal funds purchased	$ 0

REGULATORY CAPITAL REQUIREMEN_3

REGULATORY CAPITAL REQUIREMENTS - Narratives (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Regulatory capital requirements
Actual, Ratio (as a percent)	4.5	7
Actual, Ratio (as a percent)	6	8.5
Actual, Ratio (as a percent)	8	10.5
Basel III
Regulatory capital requirements
Additional capital conservation buffer (as a percentage)	2.50%
Actual, Ratio (as a percent)	10.3	10.2
Actual, Ratio (as a percent)	10.3	10.2
Actual, Ratio (as a percent)	13	13.1

REGULATORY CAPITAL REQUIREMEN_4

REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Common equity tier 1 capital to risk weighted assets:
Actual, Ratio (as a percent)	4.5	7
Total Capital (to risk weighted assets)
Actual, Ratio (as a percent)	8	10.5
Tier 1 Capital (to risk weighted assets)
Actual, Ratio (as a percent)	6	8.5
Basel III
Common equity tier 1 capital to risk weighted assets:
Actual, Amount	$ 424,652	$ 397,800
Actual, Ratio (as a percent)	10.3	10.2
Minimum Capital Adequacy Requirement, Amount	$ 185,479	$ 176,121
Minimum Capital Adequacy Requirement, Ratio (as a percent)	4.50%	4.50%
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 288,523	$ 273,967
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	7.00%	7.00%
Total Capital (to risk weighted assets)
Actual, Amount	$ 537,664	$ 510,862
Actual, Ratio (as a percent)	13	13.1
Minimum Capital Adequacy Requirement, Amount	$ 329,740	$ 313,105
Minimum Capital Adequacy Requirement (as a percent)	8	8
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 432,784	$ 410,950
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	10.50%	10.50%
Tier 1 Capital (to risk weighted assets)
Actual, Amount	$ 424,652	$ 397,800
Actual, Ratio (as a percent)	10.3	10.2
For Capital Adequacy Purposes, Amount	$ 247,305	$ 234,828
For Capital Adequacy Purposes, Ratio (as a percent)	6	6
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 350,349	$ 332,674
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	8.50%	8.50%
Tier 1 Capital (to average assets)
Actual, Amount	$ 424,652	$ 397,800
Actual, Ratio (as a percent)	6.8	8.5
For Capital Adequacy Purposes, Amount	$ 249,502	$ 187,386
For Capital Adequacy Purposes, Ratio (as a percent)	4	4
BNB Bank (Bank) | Basel III
Common equity tier 1 capital to risk weighted assets:
Actual, Amount	$ 503,524	$ 474,056
Actual, Ratio (as a percent)	12.2	12.1
Minimum Capital Adequacy Requirement, Amount	$ 185,465	$ 176,114
Minimum Capital Adequacy Requirement, Ratio (as a percent)	4.50%	4.50%
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 288,502	$ 273,954
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	7.00%	7.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 267,895	$ 254,386
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	6.50%	6.50%
Total Capital (to risk weighted assets)
Actual, Amount	$ 544,536	$ 507,118
Actual, Ratio (as a percent)	13.2	13
Minimum Capital Adequacy Requirement, Amount	$ 329,716	$ 313,091
Minimum Capital Adequacy Requirement (as a percent)	8	8
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 432,753	$ 410,932
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	10.50%	10.50%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 412,145	$ 391,363
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions (as a percent)	10	10
Tier 1 Capital (to risk weighted assets)
Actual, Amount	$ 503,524	$ 474,056
Actual, Ratio (as a percent)	12.2	12.1
For Capital Adequacy Purposes, Amount	$ 247,287	$ 234,818
For Capital Adequacy Purposes, Ratio (as a percent)	6	6
Minimum Capital Adequacy Requirement with Capital Conservation Buffer, Amount	$ 350,324	$ 332,659
Minimum Capital Adequacy Requirement with Capital Conservation Buffer (as a percent)	8.50%	8.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 329,716	$ 313,091
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	8	8
Tier 1 Capital (to average assets)
Actual, Amount	$ 503,524	$ 474,056
Actual, Ratio (as a percent)	8.1	10.1
For Capital Adequacy Purposes, Amount	$ 249,389	$ 187,377
For Capital Adequacy Purposes, Ratio (as a percent)	4	4
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 311,737	$ 234,222
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	5	5

PARENT COMPANY ONLY CONDENSED_3

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 876,828	$ 117,194	$ 295,368	$ 94,747
Other assets	83,072	38,399
Total assets	6,434,296	4,921,520
Liabilities and stockholders' equity:
Subordinated debentures, net	79,059	78,920
Total liabilities	5,916,465	4,424,366
Total stockholders' equity	517,831	497,154	453,830	429,200
Total liabilities and stockholders' equity	6,434,296	4,921,520
Parent Company
Assets:
Cash and cash equivalents	280	3,663	$ 1,537	$ 7,858
Other assets	554	174
Investment in the Bank	596,703	573,410
Total assets	597,537	577,247
Liabilities and stockholders' equity:
Subordinated debentures, net	79,059	78,920
Other liabilities	647	1,173
Total liabilities	79,706	80,093
Total stockholders' equity	517,831	497,154
Total liabilities and stockholders' equity	$ 597,537	$ 577,247

PARENT COMPANY ONLY CONDENSED_4

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statements of 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
Condensed financial information
Interest expense	$ 4,492	$ 5,589	$ 5,418	$ 7,952	$ 8,672	$ 9,639	$ 10,835	$ 10,192	$ 23,451	$ 39,338	$ 32,204
Non-interest expense	35,078	28,937	24,399	24,843	25,332	24,204	24,004	22,599	113,257	96,139	98,180
Income tax benefit	3,881	3,999	3,129	2,676	3,934	3,852	2,859	3,415	13,685	14,060	9,141
Net income	$ 8,977	$ 13,061	$ 10,656	$ 9,348	$ 14,208	$ 13,903	$ 10,653	$ 12,927	42,042	51,691	39,227
Parent Company
Condensed financial information
Dividends from the Bank									26,500	24,500	15,000
Interest expense									4,401	4,539	4,539
Non-interest expense									252	104	135
Income before income taxes and equity in undistributed earnings of the Bank									21,847	19,857	10,326
Income tax benefit									(1,280)	(994)	(1,005)
Income before equity in undistributed earnings of the Bank									23,127	20,851	11,331
Equity in undistributed earnings of the Bank									18,915	30,840	27,896
Net income									$ 42,042	$ 51,691	$ 39,227

PARENT COMPANY ONLY CONDENSED_5

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 42,042	$ 51,691	$ 39,227
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in other assets	(11,916)	3,942	(2,373)
(Decrease) increase in other liabilities	(5,371)	(1,509)	3,430
Net cash provided by operating activities	47,387	69,962	58,383
Cash flows from investing activities:
Net cash used in investing activities	(716,840)	(352,606)	(80,549)
Cash flows from financing activities:
Net proceeds from issuance of common stock	1,267	1,102	1,017
Purchase of treasury stock	(4,633)	(625)
Repurchase of surrendered stock from vesting of stock plans	(3,181)	(887)	(586)
Cash dividends paid	(19,197)	(18,420)	(18,342)
Net cash provided by financing activities	1,429,087	104,470	222,787
Net increase (decrease) in cash and cash equivalents	759,634	(178,174)	200,621
Cash and cash equivalents at beginning of period	117,194	295,368	94,747
Cash and cash equivalents at end of period	876,828	117,194	295,368
Parent Company
Cash flows from operating activities:
Net income	42,042	51,691	39,227
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of the Bank	(18,915)	(30,840)	(27,896)
Amortization	139	139	140
(Increase) decrease in other assets	(379)	(73)	108
(Decrease) increase in other liabilities	(526)	39	11
Net cash provided by operating activities	22,361	20,956	11,590
Cash flows from financing activities:
Net proceeds from issuance of common stock	1,267	1,102	1,017
Purchase of treasury stock	(4,633)	(625)
Repurchase of surrendered stock from vesting of stock plans	(3,181)	(887)	(586)
Cash dividends paid	(19,197)	(18,420)	(18,342)
Net cash provided by financing activities	(25,744)	(18,830)	(17,911)
Net increase (decrease) in cash and cash equivalents	(3,383)	2,126	(6,321)
Cash and cash equivalents at beginning of period	3,663	1,537	7,858
Cash and cash equivalents at end of period	$ 280	$ 3,663	$ 1,537

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components and Related Income Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on available for sale securities	$ 9,069	$ 15,524	$ (8,429)
Reclassification adjustments for (gains) losses realized in income	(3,525)	(201)	7,921
Income tax effect	(1,628)	(4,467)	160
Net change in unrealized (losses) gains on available for sale securities	3,916	10,856	(348)
Unrealized net losses arising during the period	3,245	1,076	1,567
Reclassification adjustments for amortization realized in income	581	487	384
Income tax effect	799	179	351
Net change in post-retirement obligation	(1,865)	(410)	(832)
Change in fair value of derivatives used for cash flow hedges	(10,455)	(3,601)	2,493
Reclassification adjustments for losses (gains) realized in income	5,016	(1,588)	(1,068)
Income tax effect	1,601	1,514	(418)
Net change in unrealized (losses) gains on cash flow hedges	(3,838)	(3,675)	1,007
Other comprehensive income (loss)	$ (1,787)	$ 6,771	$ (173)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of the Accumulated Other Comprehensive (Loss) Income Balances, Net of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period	$ (829)
Current Period Change	3,916	$ 10,856	$ (348)
Balance at the end of the period	(3,087)	(829)
Unrealized losses on pension benefits
Balance at the beginning of the period	(6,775)
Current Period Change	(1,865)	(410)	(832)
Balance at the end of the period	(8,640)	(6,775)
Unrealized losses on cash flow hedges
Balance at the beginning of the period	(737)
Current Period Change	(3,838)	(3,675)	1,007
Balance at the end of the period	(4,575)	(737)
Accumulated other comprehensive loss, net of income taxes
Balance at the beginning of the period	(8,341)
Current Period Change	(1,787)	6,771	$ (173)
Balance at the end of the period	$ (10,128)	$ (8,341)

ACCUMULATED OTHER COMPREHENSI_5

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive (Loss) 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
Reclassifications out of accumulated other comprehensive (loss) income
Interest expense	$ 4,492	$ 5,589	$ 5,418	$ 7,952	$ 8,672	$ 9,639	$ 10,835	$ 10,192	$ 23,451	$ 39,338	$ 32,204
Loss on termination of swaps									(3,403)
Income tax benefit (expense)	(3,881)	(3,999)	(3,129)	(2,676)	(3,934)	(3,852)	(2,859)	(3,415)	(13,685)	(14,060)	(9,141)
Net income	$ 8,977	$ 13,061	$ 10,656	$ 9,348	$ 14,208	$ 13,903	$ 10,653	$ 12,927	42,042	51,691	39,227
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income
Reclassifications out of accumulated other comprehensive (loss) income
Total reclassifications, before income tax									(2,072)	1,302	(7,237)
Net income									(1,466)	922	(5,132)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Loss on termination of swaps
Reclassifications out of accumulated other comprehensive (loss) income
Loss on termination of swaps									(3,365)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Income tax expense
Reclassifications out of accumulated other comprehensive (loss) income
Income tax benefit (expense)									606	(380)	2,105
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Realized gains (losses) on sale of available for sale securities | Net securities gains (losses)
Reclassifications out of accumulated other comprehensive (loss) income
Net securities gains									3,525	201	(7,921)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Prior service credit | Other operating expenses
Reclassifications out of accumulated other comprehensive (loss) income
Other operating expenses									77	77	77
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Transition obligation | Other operating expenses
Reclassifications out of accumulated other comprehensive (loss) income
Other operating expenses											(5)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Actuarial losses | Other operating expenses
Reclassifications out of accumulated other comprehensive (loss) income
Other operating expenses									(658)	(564)	(456)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Realized (losses) gains on cash flow hedges | Interest expense.
Reclassifications out of accumulated other comprehensive (loss) income
Interest expense									$ (1,651)	$ 1,588	$ 1,068

QUARTERLY FINANCIAL DATA (UNA_3

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
QUARTERLY FINANCIAL DATA (UNAUDITED)
Interest income	$ 47,484	$ 46,296	$ 45,850	$ 44,602	$ 44,320	$ 46,354	$ 46,352	$ 44,515	$ 184,232	$ 181,541	$ 168,984
Interest expense	4,492	5,589	5,418	7,952	8,672	9,639	10,835	10,192	23,451	39,338	32,204
Net interest income	42,992	40,707	40,432	36,650	35,648	36,715	35,517	34,323	160,781	142,203	136,780
Provision for credit losses	500	1,500	4,500	5,000	600	1,000	3,500	600	11,500	5,700	1,800
Net interest income after provision for credit losses	42,492	39,207	35,932	31,650	35,048	35,715	32,017	33,723	149,281	136,503	134,980
Non-interest income (loss)	5,444	6,790	2,252	5,217	8,426	6,244	5,499	5,218	19,703	25,387	11,568
Non-interest expense	35,078	28,937	24,399	24,843	25,332	24,204	24,004	22,599	113,257	96,139	98,180
Income before income taxes	12,858	17,060	13,785	12,024	18,142	17,755	13,512	16,342	55,727	65,751	48,368
Income tax expense	3,881	3,999	3,129	2,676	3,934	3,852	2,859	3,415	13,685	14,060	9,141
Net income	$ 8,977	$ 13,061	$ 10,656	$ 9,348	$ 14,208	$ 13,903	$ 10,653	$ 12,927	$ 42,042	$ 51,691	$ 39,227
Basic earnings per share (in dollars per share)	$ 0.45	$ 0.66	$ 0.54	$ 0.47	$ 0.71	$ 0.70	$ 0.53	$ 0.65	$ 2.11	$ 2.59	$ 1.97
Diluted earnings per share (in dollars per share)	$ 0.45	$ 0.66	$ 0.54	$ 0.47	$ 0.71	$ 0.70	$ 0.53	$ 0.65	$ 2.11	$ 2.59	$ 1.97

QUARTERLY FINANCIAL DATA (UNA_4

QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020
QUARTERLY FINANCIAL DATA (UNAUDITED)
Merger expenses	$ 2.1	$ 2.4

NET FRAUD LOSS (Details)

NET FRAUD LOSS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
NET FRAUD LOSS
Net fraud loss	$ 8,900

SUBSEQUENT EVENT (Details)

SUBSEQUENT EVENT (Details) $ / shares in Units, $ in Millions	Feb. 01, 2021USD ($)$ / sharesshares	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019$ / sharesshares	Sep. 30, 2015USD ($)
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock issued to Legacy Dime shareholders in connection with the Merger | shares		19,951,955	19,898,022
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares issued | shares		0	0
Aggregate principal amount of 4.50% Fixed-to-Floating Rate Debentures due 2027 | $				$ 80
Subsequent Event
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Share conversion ratio	0.6480
Subsequent Event | Legacy Dime
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Common stock issued to Legacy Dime shareholders in connection with the Merger | shares	21,232,920
Preferred stock, par value (in dollars per share)	$ 0.01
Subsequent Event | Subordinated Debentures | Legacy Dime
Subsequent Event [Line Items]
Aggregate principal amount of 4.50% Fixed-to-Floating Rate Debentures due 2027 | $	$ 115
Fixed interest rate of debentures	4.50%
Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Share conversion ratio	1
Non-Cumulative Perpetual Preferred Stock, Series A | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares issued | shares	5,299,200
Preferred stock fixed-rate	5.50%