Bar Harbor Bankshares (BHB) 10-Q 5 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Entity File Number	001-13349
Entity Registrant Name	BAR HARBOR BANKSHARES
Entity Incorporation, State or Country Code	ME
Entity Tax Identification Number	01-0393663
Entity Address, Address Line One	PO Box 400
Entity Address, Address Line Two	82 Main Street
Entity Address, City or Town	Bar Harbor
Entity Address, State or Province	ME
Entity Address, Postal Zip Code	04609-0400
City Area Code	207
Local Phone Number	288-3314
Title of 12(b) Security	Common Stock, par value $2.00 per share
Trading Symbol	BHB
Security Exchange Name	NYSEAMER
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		14,975,300
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000743367
Amendment Flag	false
Entity Address, Country	US

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 39,039	$ 27,566
Interest-bearing deposits with other banks	184,473	198,441
Total cash and cash equivalents	223,512	226,007
Securities:
Securities available for sale	626,403	585,046
Federal Home Loan Bank stock	14,826	14,036
Total securities	641,229	599,082
Loans held for sale	10,148	23,988
Loans:
Total loans	2,551,064	2,562,885
Less: Allowance for credit losses	(23,653)	(19,082)
Net loans	2,527,411	2,543,803
Premises and equipment, net	52,253	52,458
Goodwill	119,477	119,477
Other intangible assets	7,431	7,670
Cash surrender value of bank-owned life insurance	78,388	77,870
Deferred tax assets, net	5,639	1,745
Other assets	64,742	73,662
Total assets	3,730,230	3,725,762
Deposits:
Demand	586,487	544,636
NOW	761,817	738,849
Savings	560,095	521,638
Money market	365,507	402,731
Time	638,436	698,361
Total deposits	2,912,342	2,906,215
Borrowings:
Senior	292,210	276,062
Subordinated	60,003	59,961
Total borrowings	352,213	336,023
Other liabilities	60,094	72,183
Total liabilities	3,324,649	3,314,421
Shareholders' equity
Capital stock, par value $2.00; authorized 20,000,000 shares; issued 16,428,388 shares at March 31, 2021 and December 31, 2020	32,857	32,857
Additional paid-in capital	190,564	190,084
Retained earnings	196,561	195,607
Accumulated other comprehensive income	3,464	11,016
Less: 1,478,416 and 1,512,465 shares of treasury stock at March 31, 2021 and December 31, 2020, respectively	(17,865)	(18,223)
Total shareholders' equity	405,581	411,341
Total liabilities and shareholders' equity	$ 3,730,230	$ 3,725,762

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Capital stock, par value (in dollars per share)	$ 2	$ 2
Capital stock, shares authorized (in shares)	20,000,000	20,000,000
Capital stock, shares issued (in shares)	16,428,388	16,428,388
Treasury stock (in shares)	1,478,416	1,512,465

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and dividend income
Loans	$ 24,205	$ 27,987
Securities and other	3,979	5,507
Total interest and dividend income	28,184	33,494
Interest expense
Deposits	2,951	6,020
Borrowings	1,811	2,911
Total interest expense	4,762	8,931
Net interest income	23,422	24,563
Provision for credit losses	(489)	1,111
Net interest income after provision for loan losses	23,911	23,452
Non-interest income
Trust and investment management fee income	3,666	3,369
Customer service fees	2,970	3,112
Gain on sales of securities, net	0	135
Mortgage banking income	2,570	457
Bank-owned life insurance income	518	537
Customer derivative income	410	588
Other income	114	223
Total non-interest income	10,248	8,421
Non-interest expense
Salaries and employee benefits	12,176	11,884
Occupancy and equipment	4,328	4,420
Loss on premises and equipment, net	8	92
Outside services	432	534
Professional services	558	672
Communication	321	289
Marketing	290	388
Amortization of intangible assets	241	256
Acquisition, conversion and other expenses	889	103
Other expenses	3,248	3,721
Total non-interest expense	22,491	22,359
Income before income taxes	11,668	9,514
Income tax expense	2,188	1,793
Net income	$ 9,480	$ 7,721
Earnings per share:
Basic (in dollars per share)	$ 0.63	$ 0.50
Diluted (in dollars per share)	$ 0.63	$ 0.50
Weighted average common shares outstanding:
Basic (in shares)	14,933,554	15,558,132
Diluted (in shares)	15,006,715	15,592,595

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 9,480	$ 7,721
Other comprehensive income, before tax:
Changes in unrealized (loss) gain on securities available for sale	(7,185)	5,357
Changes in unrealized loss on hedging derivatives	(2,659)	(2,382)
Changes in unrealized loss on pension	0	0
Income taxes related to other comprehensive income:
Changes in unrealized loss (gain) on securities available for sale	1,672	(1,346)
Changes in unrealized loss on hedging derivatives	620	650
Changes in unrealized loss on pension	0	0
Total other comprehensive (loss) income	(7,552)	2,279
Total comprehensive income	$ 1,928	$ 10,000

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common stock amountImpact of CECL Adoption	Common stock amount	Additional paid-in capitalImpact of CECL Adoption	Additional paid-in capital	Retained earningsImpact of CECL Adoption	Retained earnings	Accumulated other comprehensive income (loss)Impact of CECL Adoption	Accumulated other comprehensive income (loss)	Treasury stockImpact of CECL Adoption	Treasury stock	Impact of CECL Adoption	Total
Balance at beginning of period at Dec. 31, 2019		$ 32,857		$ 188,536		$ 175,780		$ 3,911		$ (4,677)		$ 396,407
Increase (Decrease) in Stockholders' Equity
Net income		0		0		7,721		0		0		7,721
Other comprehensive (loss) income		0		0		0		2,279		0		2,279
Cash dividends declared		0		0		(3,429)		0		0		(3,429)
Treasury stock purchased		0		0		0		0		(130)		(130)
Net issuance to employee stock plans, including related tax effects		0		660		0		0		129		789
Recognition of stock based compensation		0		118		0		0		0		118
Balance at end of period at Mar. 31, 2020		32,857		189,314		180,072		6,190		(4,678)		403,755
Balance at beginning of period (Accounting Standards Update 2016-13) at Dec. 31, 2020	$ 0		$ 0		$ (5,242)		$ 0		$ 0		$ (5,242)
Balance at beginning of period at Dec. 31, 2020		32,857		190,084		195,607		11,016		(18,223)		411,341
Increase (Decrease) in Stockholders' Equity
Net income		0		0		9,480		0		0		9,480
Other comprehensive (loss) income		0		0		0		(7,552)		0		(7,552)
Cash dividends declared		0		0		(3,284)		0		0		(3,284)
Net issuance to employee stock plans, including related tax effects		0		(186)		0		0		358		172
Recognition of stock based compensation		0		666		0		0		0		666
Balance at end of period at Mar. 31, 2021		$ 32,857		$ 190,564		$ 196,561		$ 3,464		$ (17,865)		$ 405,581

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.22	$ 0.22
Treasury stock purchased (in shares)		5,586
Net issuance (in shares)	34,049	23,010

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 9,480	$ 7,721
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(489)	1,111
Net amortization of securities	1,215	686
Change in unamortized net loan costs and premiums	(1,768)	(1,358)
Premises and equipment depreciation	1,181	1,182
Stock-based compensation expense	666	118
Accretion of purchase accounting entries, net	4	(263)
Amortization of other intangibles	241	256
Income from cash surrender value of bank-owned life insurance policies	(518)	(537)
Gain on sales of securities, net		(135)
Decrease in right-of-use lease assets	282	506
Decrease in lease liabilities	(259)	(555)
Loss on other real estate owned		31
Loss on premises and equipment, net	8	92
Net change in other assets and liabilities	(3,887)	(5,851)
Net cash provided by operating activities	6,156	3,004
Cash flows from investing activities:
Proceeds from sales of securities available for sale		32,017
Proceeds from maturities, calls and prepayments of securities available for sale	28,687	24,899
Purchases of securities available for sale	(79,583)	(15,739)
Net change in loans	25,330	6,300
Purchase of FHLB stock	(790)	(3,161)
Proceeds from sale of FHLB stock		3,943
Purchase of premises and equipment, net	(982)	(628)
Net investment in community limited partnerships	(470)
Acquisitions, net of cash acquired		(340)
Proceeds from sale of other real estate owned		51
Net cash (used in) provided by investing activities	(27,808)	47,342
Cash flows from financing activities:
Net change in deposits	6,127	(44,959)
Net change in short-term senior borrowings	19,653	(98,970)
Proceeds from long-term senior borrowings		139,000
Repayments of long-term senior borrowings	(8)
Net change in short-term other borrowings	(3,503)	(13,831)
Repayments of subordinated debt		(32)
Payment of subordinated debt issuance costs		(39)
Net issuance to employee stock plans	172	789
Purchase of treasury and common stock		(130)
Cash dividends paid on common stock	(3,284)	(3,429)
Net cash provided by (used in) financing activities	19,157	(21,601)
Net change in cash and cash equivalents	(2,495)	28,745
Cash and cash equivalents at beginning of year	226,007	56,910	$ 56,910
Cash and cash equivalents at end of year	223,512	85,655	$ 226,007
Supplemental cash flow information:
Interest paid	6,231	8,455
Income taxes paid, net	$ 3,389	1,205
Acquisition of non-cash assets and liabilities:
Assets acquired		1,171
Liabilities acquired		$ (343)

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2021
BASIS OF PRESENTATION
BASIS OF PRESENTATION	NOTE 1. BASIS OF PRESENTATION ​ The consolidated financial statements (the “financial statements”) of Bar Harbor Bankshares and its subsidiaries (the “Company” or “Bar Harbor”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Bar Harbor Bankshares is a Maine Financial Institution Holding Company for the purposes of the laws of the state of Maine, and as such is subject to the jurisdiction of the Superintendent of the Maine Bureau of Financial Institutions. These financial statements include the accounts of the Company, its wholly owned subsidiary Bar Harbor Bank & Trust (the "Bank") and the Bank’s consolidated subsidiaries. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly owned and majority owned subsidiaries are consolidated unless GAAP requires otherwise. ​ In addition, these interim financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X, and accordingly, certain information and footnote disclosures normally included in financial statements prepared according to GAAP have been omitted. ​ The results for any interim period are not necessarily indicative of results for the full year. These consolidated financial statements should be read in conjunction with the audited financial statements and note disclosures for the Company's Annual Report on Form 10-K for the year ended December 31, 2020 previously filed with the Securities and Exchange Commission (the "SEC"). In management's opinion, all adjustments necessary for a fair statement are reflected in the interim periods presented. ​ Reclassifications: ​ Summary of Significant Accounting Policies ​ The disclosures below supplement updates the accounting policies previously disclosed in NOTE 1 – Summary of Significant Accounting Policies of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The updates reflect the adoption of the Financial Accounting Standards Board (FASB) Accounting Standards Updates (ASU) 2016-13, “Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments”, referred to as ASC 326 or, more commonly, referred to as Current Expected Credit Losses (CECL). Allowance for Credit Loss on AFS Debt Securities: A change in the allowance on AFS debt securities may be in full or a portion thereof, is recorded as expense (credit) within provision for credit losses on the consolidated statements of income. Losses are charged against the allowance when management believes the uncollectibility of an AFS debt security is confirmed based on the above described analysis. As of March 31, 2021 and January 1, 2021 (i.e. ASU 2016-13 adoption), there was no allowance carried on the Company's AFS debt securities. Refer to Note 2 of the consolidated financial statements for further discussion. Loans: For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the contractual term of the loan using the level-yield method over the estimated lives of the related loans. When a loan is paid off, the unamortized portion of deferred fees or costs are recognized in interest income. Interest income on originated loans is accrued based upon the daily principal amount outstanding except for loans on non-accrual status. For acquired loans, interest income is accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan that was recognized based on the acquisition date fair value. When a loan is paid off, the unamortized portion of any premiums or discounts on loans are recognized in interest income. Purchase Credit Deteriorated (PCD) Loans: ​ The Company adopted CECL using the prospective transition approach for financial assets purchased with credit deterioration that were previously classified as purchased credit impaired (PCI) and accounted for under ASC 310-30. In accordance with the standard, the Company did not reassess whether PCI assets met the definition of PCD assets as of the date of adoption. On January 1, 2021, the amortized cost basis of the PCD assets representing the noncredit discount will be accreted into interest income using the level-yield method over the estimated lives of the related loans. The converted PCD assets of $12.5 million were then pooled by call report coding and an additional allowance was calculated on the pooled assets separately from other loan pools totaling $524 thousand. ​ Non-performing loans: When a loan has been placed on non-accrual status, previously accrued and uncollected interest is reversed against interest on the loan. The interest on non-accrual loans is accounted for using the cash-basis or cost-recovery method depending on corresponding credit risk, until qualifying for return to accrual status. A loan can be returned to accrual status when collectability of principal is reasonably assured and the loan has performed for a period of time, generally six months. Previously, acquired loans that met the criteria for non-accrual of interest prior to the acquisition were considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company could reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans and any change in performance would have impacted accretable yield. After adoption of ASC 326 on January 1, 2021 the Company now treats these non-performing acquired loans that meet the criteria for non-accrual consistent with originated loans. Allowance for Credit Losses: ​ Upon adoption of ASC 326 or CECL on January 1, 2021, the Company replaced the incurred loss impairment model that recognizes losses when it becomes probable that a credit loss will be incurred, with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the allowance when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged- off. The allowance is comprised of reserves measured on a collective (pool) basis based on a lifetime loss-rate model when similar risk characteristics exist. Loans that do not share risk characteristics are evaluated on an individual basis, generally larger non-accruing commercial loans and TDRs. ​ The Company uses the discounted cash flow (“DCF”) method to estimate expected credit losses for all loan portfolio segments measured on a collective (pool) basis. For each loan segment, the Company generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speeds, probability of default, and loss given default. The modeling of prepayment speeds is based on historical internal data. ​ The Company uses regression analysis of historical internal and peer data to determine suitable loss drivers to utilize when modeling lifetime probability of default. This analysis also determines how expected probability of default and loss given default will react to forecasted levels of the loss drivers. For all loan pools utilizing the DCF method, management utilizes various economic indicators such as changes in unemployment rates, gross domestic product, property values, housing starts, and other relevant factors as loss drivers. For all DCF models, management has determined that due to historic volatility in economic data, two quarters currently represents a reasonable and supportable forecast period, followed by a six-period reversion to historical mean levels for each of the various economic indicators. ​ The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Specific instrument effective yields are calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level Net Present Value ("NPV"). An allowance is established for the difference between the instrument’s NPV and amortized cost basis. ​ The allowance evaluation also considers various qualitative factors, such as: (i) changes to lending policies, underwriting standards and/or management personnel performing such functions, (ii) delinquency and other credit quality trends, (iii) credit risk concentrations, if any, (iv) changes to the nature of the Company's business impacting the loan portfolio, (v) and other external factors, that may include, but are not limited to, results of internal loan reviews, stress testing, examinations by bank regulatory agencies, or other events such as a natural disaster. ​ Arriving at an appropriate level of allowance involves a high degree of judgment. The determination of the adequacy of the allowance and provisioning for estimated losses is evaluated regularly based on review of loans, with particular emphasis on non-performing and other loans that management believes warrant special consideration. While management uses available information to recognize losses on loans, changing economic conditions and the economic prospects of the borrowers may necessitate future additions or reductions to the allowance. ​ Individually Evaluated Loans : ​ With the adoption of CECL, loans that do not share risk characteristics with existing pools are evaluated on an individual basis. For collateral dependent financial loans where the Company has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral. When repayment is expected to be from the operation of the collateral, the specific credit loss reserve is calculated as the amount by which the amortized cost basis of the financial asset exceeds the NPV from the operation of the collateral. When repayment is expected to be from the sale of the collateral, the specific credit loss reserve is calculated as the amount by which the amortized costs basis of the financial asset exceeds the fair value of the underlying collateral less estimated cost to sell. The allowance may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset. ​ Accrued Interest ​ Allowance for off-balance sheet credit exposures: ​ Impact of Adoption ​ The following table illustrates the adoption of CECL on January 1, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reclassification ​ Pre-CECL ​ Post-CECL ​ ​ ​ ​ ​ ​ ​ ​ to CECL ​ Adoption ​ Adoption ​ Impact of ​ ​ Pre-CECL ​ Portfolio ​ Portfolio ​ Portfolio ​ CECL (in thousands) Adoption Segmentation Segmentation Segmentation Adoption Assets: ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ Commercial construction ​ $ 131,123 ​ $ (13,241) ​ $ 117,882 ​ $ 117,882 ​ $ — Commercial real estate ​ 953,258 ​ (953,258) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 219,217 ​ 219,217 ​ 219,217 ​ — Commercial real estate non-owner occupied ​ — ​ 716,776 ​ 716,776 ​ 716,776 ​ — Tax exempt ​ 63,431 ​ (15,569) ​ 47,862 ​ 47,862 ​ — Commercial and industrial ​ 377,638 ​ (21,954) ​ 355,684 ​ 355,684 ​ — Residential real estate ​ 923,891 ​ 71,325 ​ 995,216 ​ 995,216 ​ — Home equity ​ 102,464 ​ (2,368) ​ 100,096 ​ 100,096 ​ — Consumer other ​ 11,080 ​ (928) ​ 10,152 ​ 10,152 ​ — Total loans ​ $ 2,562,885 ​ $ — ​ $ 2,562,885 ​ $ 2,562,885 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit losses on loans ​ ​ ​ ​ ​ Commercial construction ​ $ 1,044 ​ $ (220) ​ $ 824 ​ $ 2,020 ​ $ 1,196 Commercial real estate ​ 10,199 ​ (10,199) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 1,783 ​ 1,783 ​ 2,491 ​ 708 Commercial real estate non-owner occupied ​ — ​ 7,864 ​ 7,864 ​ 5,856 ​ (2,008) Tax exempt ​ 80 ​ (22) ​ 58 ​ 98 ​ 40 Commercial and industrial ​ 3,302 ​ (165) ​ 3,137 ​ 6,133 ​ 2,996 Residential real estate ​ 4,078 ​ 932 ​ 5,010 ​ 6,742 ​ 1,732 Home equity ​ 258 ​ 27 ​ 285 ​ 888 ​ 603 Consumer other ​ 121 ​ — ​ 121 ​ 82 ​ (39) Total allowance for credit losses on loans ​ $ 19,082 ​ $ — ​ $ 19,082 ​ $ 24,310 ​ $ 5,228 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ Allowance for credit losses on unfunded commitments ​ $ 359 ​ $ — ​ $ 359 ​ $ 1,975 ​ $ 1,616 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total allowance for credit losses ​ $ 19,441 ​ $ — ​ $ 19,441 ​ $ 26,285 ​ $ 6,844 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retained earnings: ​ ​ ​ ​ ​ Total increase in Allowance for credit losses ​ ​ ​ ​ ​ $ 6,844 Balance sheet reclassification ​ ​ ​ ​ ​ — Total pre-tax impact ​ ​ ​ ​ ​ 6,844 Tax effect ​ ​ ​ ​ ​ (1,602) Decrease to retained earnings ​ ​ ​ ​ ​ $ 5,242 ​ ​ ​ ​ ​ ​ ​ Recent Accounting Pronouncements ​ The following table provides a brief description of recent accounting standards updates ("ASU") that could have a material impact to the Company’s consolidated financial statements upon adoption: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Standard Description Required Date Effect on financial statements Standards Adopted in 2021 ​ ​ ​ ASU 2016-13, Measurement of Credit Losses on Financial Instruments ASU 2018‑19, Codification Improvements to ASU 2016-13 ​ ​ This ASU amends Topic 326, Financial Instruments- Credit Losses to replace the current incurred loss accounting model with a current expected credit loss approach ("CECL") for financial instruments measured at amortized cost and other commitments to extend credit, such as of balance sheet credit exposures (loan comitments, unused line of credit and stand-by letters of credit). The amendments require entities to consider all available relevant information when estimating current expected credit losses, including details about past events, current conditions, and reasonable and supportable forecasts. The resulting allowance for credit losses is to reflect the portion of the amortized cost basis that the entity does not expect to collect. The amendments also eliminate the current accounting model for purchased credit impaired loans and certain off-balance sheet exposures. Additional quantitative and qualitative disclosures are required upon adoption. ​ ​ January 1, 2022 ​ ​ ​ Adoption of this ASU is expected to primarily change how the Company estimates credit losses with the application of the expected credit loss model. The Company will apply the standard's provisions as a cumulative effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company's CECL implementation efforts in the first quarter focused on the finalization and board approval of the final CECL model, completed modelling of off-balance sheet credit risks, completed formal governance and control documentation, and developed and presented revised disclosures for board approval. million. Equity was reduced by million in the first quarter due to adoption. The coverage ratio of ACL to total loans increased to ​ Standard Description Required Date Effect on financial statements Standards Adopted in 2021 ​ ​ ​ ASU 2018-14 Compensation- Disclosure Requirements for Defined Pension Plans Topic 715-20 ​ ​ This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other post-retirement benefit plans. ​ ​ January 1, 2021 ​ ​ Adoption of this ASU did not have a material impact on the Company's consolidated financial statements. The impact will be reflected in the Company’s annual 10-K disclosures of employee benefit plans. ASU 2020-01, Investments—Equity Securities, Investments Equity Method and Joint Ventures, and Derivatives and Hedging ​ ​ In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which added Topic 321, Investments – Equity Securities, and made targeted improvements to address certain aspects of accounting for financial instruments. The amendments in this Update affect all entities that apply the guidance in Topics 321, 323, and 815 and (1) elect to apply the measurement alternative or (2) enter into a forward contract or purchase an option to purchase securities that, upon settlement of the forward contract or exercise of the purchased option, would be accounted for under the equity method of accounting. ​ ​ December 15, 2020 ​ ​ The adoption had no material impact on the Company's consolidated financial statements. The Company’s equity method investments which primarily consist of community limited partnership investments are in compliance with the new guidance prospectively in 2021. ASU 2020-04 Facilitation of the Effects of Reference Rate Reform, Topic 848, as amended in ASU 2021-01 ​ ​ This ASU provides temporary optional expedients and exceptions to GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rate ("SOFR"). For instance, companies can (1) elect not to apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. A company that makes this election would not have to re-measure the contracts at the modification date or reassess a previous accounting determination. Companies can also (2) elect various optional expedients that would allow them to continue applying hedge accounting for hedging relationships affected by reference rate reform, if certain criteria are met. Finally, companies can (3) make a one-time election to sell and/or reclassify held-to-maturity debt securities that ​ ​ May be elected through December 31, 2022. ​ ​ The Company is currently evaluating all of its contracts, hedging relationships and other transactions that will be effected by reference rates that are being discontinued and determining which elections need to be made. The Company is currently evaluating all of its contracts, hedging relationships and other transactions that will be effected by reference rates that are being discontinued and determining which elections need to be made reference an interest rate affected by reference rate reform. ​ ​ Rate Reform Elections at March 31, 2021 ​ Adherence to ISDA Fallback Protocol The ISDA 2020 IBOR Fallbacks Protocol (the “ISDA Fallback Protocol”) was made available for adherence on October 23, 2020 with an effective date of January 25, 2021. Once adhered to by both counterparties in a bilateral relationship and the effective date is reached, the ISDA Fallback Protocol represents a change to the contractual terms of derivatives governed by each respective ISDA agreement between the Company and a derivative counterparty. The change relates to reference rate reform and represents the potential for addition of or changes to contractual terms and was developed by a private-sector working group convened by a regulator as referenced in 848-20-15-5(g). For all of the Company’s interest rate swaps that meet the scope requirements of 848-10-15-3 and 848-10-15-3A and for which the Company adhered to the ISDA Fallback Protocol, the Company makes the following elections: • Modification related elections • Option to not reassess a previous accounting determination (paragraph 848-20-35-4). • Hedge accounting related modifications • Option to not dedesignate a hedging relationship due to a change in a critical term (paragraph 848-30-25-3). • Option to change the contractual terms of a hedging instrument, hedged item, or forecasted transaction and to not dedesignate a hedging relationship (paragraph 848-30-25-5). ​ Cash flow hedges The Company hereby amends the hedge documentation, without dedesignating and redesignating, for all outstanding cash flow hedging relationships for the following elections: ​ • Probability of forecasted transactions: The Company elects the expedient in ASC 848-50-25-2 to assert probability of the hedged interest payments/receipts regardless of any expected modification in terms related to reference rate reform. • Assessment of effectiveness: In accordance with ASC 848-30-25-4, ASC 848-30-25-8, and ASC 848-50-35-1 through 35-24 the Company has the option to change the method of assessing effectiveness upon a change in the critical terms of the derivative or the hedged transactions and upon the end of relief under ASC 848. At this time the Company elects to continue the method of assessing effectiveness as documented in the original hedge documentation and elects to apply the expedient in ASC 848-50-35-17 so that the reference rate on the hypothetical derivative matches the reference rate on the hedging instrument. For new hedging relationships designated subsequent to the date of this memorandum, the Company elects to apply the expedient in ASC 848-50-25-11 to assume that the reference rate will not be replaced for the remainder of the hedging relationship. ​ New hedging activity The Company makes the same elections for each hedging relationship designated subsequent to March 31, 2021. Any hedging relationship-specific elections beyond the elections noted above will be documented in the respective inception hedge documentation. Subsequent election of optional expedients and exceptions after the March 31, 2021 will be documented in accordance with the elections being made here. ​ ​

SECURITIES AVAILABLE FOR SALE

SECURITIES AVAILABLE FOR SALE	3 Months Ended
	Mar. 31, 2021
SECURITIES AVAILABLE FOR SALE
SECURITIES AVAILABLE FOR SALE	​ NOTE 2. SECURITIES AVAILABLE FOR SALE ​ The following is a summary of securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ Unrealized ​ Unrealized ​ ​ ​ (in thousands) Amortized Cost Gains Losses Fair Value March 31, 2021 ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 213,049 ​ $ 4,860 ​ $ (3,302) ​ $ 214,607 US Government agency ​ 74,293 ​ 2,211 ​ (319) ​ 76,185 Private label ​ 47,576 ​ 111 ​ (146) ​ 47,541 Obligations of states and political subdivisions thereof ​ 185,985 ​ 3,081 ​ (1,203) ​ 187,863 Corporate bonds ​ 99,616 ​ 1,560 ​ (969) ​ 100,207 Total securities available for sale ​ $ 620,519 ​ $ 11,823 ​ $ (5,939) ​ $ 626,403 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ Unrealized ​ Unrealized ​ ​ ​ (in thousands) Amortized Cost Gains Losses Fair Value December 31, 2020 ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 206,834 ​ $ 6,018 ​ $ (462) ​ $ 212,390 US Government agency ​ 82,878 ​ 2,870 ​ (116) ​ 85,632 Private label ​ 19,810 ​ 40 ​ (141) ​ 19,709 Obligations of states and political subdivisions thereof ​ 164,766 ​ 4,244 ​ (6) ​ 169,004 Corporate bonds ​ 97,689 ​ 1,465 ​ (843) ​ 98,311 Total securities available for sale ​ $ 571,977 ​ $ 14,637 ​ $ (1,568) ​ $ 585,046 ​ Credit Quality Information The Company monitors the credit quality of available for sale debt securities through credit ratings from various rating agencies and substantial price changes. Credit ratings express opinions about the credit quality of a security and are utilized by the Company to make informed decisions. Securities are triggered for further review in the quarter if the security has significant fluctuations in ratings, drops below investment grade, or significant pricing changes. For securities without credit ratings, the Company utilizes other financial information indicating the financial health of the underlying municipality, agency, or organization associated with the underlying security. ​ As of March 31, 2021 the Company carried no allowance on available for sale debt securities in accordance with ASU 2016-13. ​ The amortized cost and estimated fair value of available for sale (“AFS”) securities segregated by contractual maturity at March 31, 2021 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Mortgage-backed securities are shown in total, as their maturities are highly variable. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale (in thousands) Amortized Cost Fair Value Within 1 year $ 4,776 ​ $ 4,848 Over 1 year to 5 years ​ 20,745 ​ 20,965 Over 5 years to 10 years ​ 75,062 ​ 73,650 Over 10 years ​ 185,018 ​ 188,607 Total bonds and obligations ​ 285,601 ​ 288,070 Mortgage-backed securities ​ 334,918 ​ 338,333 Total securities available for sale ​ $ 620,519 ​ $ 626,403 ​ ​ ​ ​ The following table presents the gains and losses from the sale of AFS securities for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, (in thousands) 2021 2020 Gross gains on sales of available for sale securities ​ $ — ​ $ 146 Gross losses on sales of available for sale securities ​ — ​ (11) Net gains on sale of available for sale securities ​ $ — ​ $ 135 ​ Securities with unrealized losses, segregated by the duration of their continuous unrealized loss positions, are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Over Twelve Months ​ Total ​ ​ Gross ​ ​ Gross ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair (in thousands) Losses Value Losses Value Losses Value March 31, 2021 ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 3,073 ​ $ 96,384 ​ $ 229 ​ $ 3,803 ​ $ 3,302 ​ $ 100,187 US Government agency ​ 300 ​ 14,716 ​ 19 ​ 4,204 ​ 319 ​ 18,920 Private label ​ 2 ​ 15,822 ​ 144 ​ 19,257 ​ 146 ​ 35,079 Obligations of states and political subdivisions thereof ​ 1,203 ​ 56,813 ​ — ​ — ​ 1,203 ​ 56,813 Corporate bonds ​ 128 ​ 14,622 ​ 841 ​ 19,158 ​ 969 ​ 33,780 Total securities available for sale ​ $ 4,706 ​ $ 198,357 ​ $ 1,233 ​ $ 46,422 ​ $ 5,939 ​ $ 244,779 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Over Twelve Months ​ Total ​ Gross ​ ​ Gross ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair (in thousands) ​ Losses ​ Value ​ Losses ​ Value ​ Losses ​ Value December 31, 2020 ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 209 ​ $ 40,285 ​ $ 253 ​ $ 4,323 ​ $ 462 ​ $ 44,608 US Government agency ​ 45 ​ 6,776 ​ 71 ​ 3,297 ​ 116 ​ 10,073 Private label ​ — ​ — ​ 141 ​ 19,514 ​ 141 ​ 19,514 Obligations of states and political subdivisions thereof ​ 6 ​ 5,577 ​ — ​ — ​ 6 ​ 5,577 Corporate bonds ​ 555 ​ 21,774 ​ 288 ​ 11,712 ​ 843 ​ 33,486 Total securities available for sale ​ $ 815 ​ $ 74,412 ​ $ 753 ​ $ 38,846 ​ $ 1,568 ​ $ 113,258 ​ The Company expects to recover its amortized cost basis on all securities in its AFS portfolio. Furthermore, the Company does not intend to sell nor does it anticipate that it will be required to sell any of its securities in an unrealized loss position as of March 31, 2021, prior to this recovery. The Company’s ability and intent to hold these securities until recovery is supported by the Company’s strong capital and liquidity positions as well as its historically low portfolio turnover. ​ The following summarizes, by investment security type, the impact of securities in an unrealized loss position for greater than 12 months at March 31, 2021: ​ US Government-sponsored enterprises ​ 50 out of the total 556 securities in the Company’s portfolios of AFS US Government-sponsored enterprises were in unrealized loss positions. Aggregate unrealized losses represented 1.55% of the amortized cost of securities in unrealized loss positions. The Federal National Mortgage Association and Federal Home Loan Mortgage Corporation guarantee the contractual cash flows of all of the Company’s US Government-sponsored enterprises. The securities are investment grade rated and there were no material underlying credit downgrades during the quarter. All securities are performing. ​ US Government agency ​ 13 out of the total 158 securities in the Company’s portfolios of AFS US Government agency securities were in unrealized loss positions. Aggregate unrealized losses represented 0.43% of the amortized cost of securities in unrealized loss positions. The Government National Mortgage Association guarantees the contractual cash flows of all of the Company’s US Government agency securities. The securities are investment grade rated and there were no material underlying credit downgrades during the quarter. All securities are performing. ​ Private label ​ 12 of the total 29 securities in the Company’s portfolio of AFS private label mortgage-backed securities were in unrealized loss positions. Aggregate unrealized losses represented 0.31% of the amortized cost of securities in unrealized loss positions. Based upon the expectation that the Company will receive all of the future contractual cash flows related to the amortized cost on these securities, the Company does not consider there to be any additional other-than-temporary impairment with respect to these securities. ​ Obligations of states and political subdivisions thereof ​ 16 of the total 144 securities in the Company’s portfolio of AFS municipal bonds and obligations were in unrealized loss positions. Aggregate unrealized losses represented 0.65% of the amortized cost of securities in unrealized loss positions. The Company continually monitors the municipal bond sector of the market carefully and periodically evaluates the appropriate level of exposure to the market. At this time, the Company feels the bonds in this portfolio carry minimal risk of default and the Company is appropriately compensated for the risk. There were no material underlying credit downgrades during the quarter. All securities are performing. ​ Corporate bonds ​ 8 out of the total 33 securities in the Company’s portfolio of AFS corporate bonds were in an unrealized loss position. The aggregate unrealized loss represents 0.97% of the amortized cost of bonds in unrealized loss positions. The Company reviews the financial strength of all of these bonds and has concluded that the amortized cost remains supported by the expected future cash flows of these securities. The most recent review includes all bond issuers and their current credit ratings, financial performance and capitalization.

LOANS AND ALLOWANCE FOR CREDIT

LOANS AND ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2021
LOANS AND ALLOWANCE FOR CREDIT LOSSES
LOANS AND ALLOWANCE FOR CREDIT LOSSES	NOTE 3. LOANS AND ALLOWANCE FOR CREDIT LOSSES ​ Upon adoption of ASC 326 or CECL, at January 1, 2021, the Company evaluates its risk characteristics of loans based on regulatory call report code with segmentation based on the underlying collateral for certain loan types. Prior to the adoption of ASC 326, under the incurred loss model, the Company evaluated its risk characteristics of loans based on purpose of the loans. ​ The following is a summary of total loans by regulatory call report code segmentation based on underlying collateral for certain loan types: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, (in thousands) 2021 2020 Commercial construction ​ $ 117,464 ​ $ 117,882 Commercial real estate owner occupied ​ 233,847 ​ 219,217 Commercial real estate non-owner occupied ​ 733,507 ​ 716,776 Tax exempt ​ 46,541 ​ 47,862 Commercial and industrial ​ 376,395 ​ 355,684 Residential real estate ​ 940,127 ​ 995,216 Home equity ​ 93,625 ​ 100,096 Consumer other ​ 9,558 ​ 10,152 Total loans ​ 2,551,064 ​ 2,562,885 Allowance for credit losses ​ 23,653 ​ 19,082 Net loans ​ $ 2,527,411 ​ $ 2,543,803 ​ Total unamortized net costs and premiums included in loan totals were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, (in thousands) 2021 2020 Unamortized net loan origination costs ​ $ 3,774 ​ $ 5,157 Unamortized net premium on purchased loans ​ (82) ​ (85) Total unamortized net costs and premiums ​ $ 3,692 ​ $ 5,072 ​ The Company elected to exclude accrued interest receivable from the amortized cost basis of loans disclosed throughout this footnote. As of March 31, 2021 and December 31, 2020, accrued interest receivable for loans totaled $11.9 million and $11.4 million, respectively, and is included in the “other assets” line item on the Company’s consolidated balance sheets. ​ The CARES Act and subsequent legislation established the Payroll Protection Program (“PPP”), administered directly by the Small Business Administration (SBA). The Company has participated in both 2020 and 2021 rounds of funding. As of March 31, 2021 and December 31, 2020, the Company had 1,057 and 746 PPP loans outstanding, with an outstanding principal balance of $77.9 million and $53.8 million, respectively. The increase reflects the 2021 round of funding of 956 PPP loans with and outstanding principal balance of $57.4 million. The PPP loans are fully guaranteed by the SBA and may be eligible for forgiveness by the SBA to the extent that the proceeds are used to cover eligible costs. PPP loans are included in the commercial and industrial portfolio segment. ​ Characteristics of each loan portfolio segment are as follows: ​ Commercial construction ​ Commercial real estate owner occupied and non-owner occupied ​ Tax Exempt ​ Commercial and industrial loans ​ Residential real estate ​ Home equity - ​ Consumer loans other ​ Allowance for Credit Losses The Allowance for Credit Losses (ACL) is comprised of the allowance for loan losses and the allowance for unfunded commitments which is accounted for as a separate liability in other liabilities on the balance sheet. The level of the ACL represents management’s estimate of expected credit losses over the expected life of the loans at the balance sheet date. ​ Upon adoption of CECL on January 1, 2021, the Company replaced the incurred loss impairment model that recognizes losses when it becomes probable that a credit loss will be incurred, with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the allowance when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged off. The ACL is comprised of reserves measured on a collective (pool) basis based on a lifetime loss-rate model when similar risk characteristics exist. Loans that do not share risk characteristics are evaluated on an individual basis, generally larger non-accruing commercial loans and TDRs. ​ ​ The Company’s activity in the allowance for credit losses for the periods ended are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021 ​ ​ Balance at ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning of ​ Impact of ASC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at (in thousands) Period 326 Charge Offs Recoveries Provision End of Period Commercial construction ​ $ 824 ​ $ 1,196 ​ $ — ​ $ 18 ​ $ (246) ​ $ 1,792 Commercial real estate owner occupied ​ 1,783 ​ 708 ​ (153) ​ 0 ​ 1,014 ​ 3,352 Commercial real estate non-owner occupied ​ 7,864 ​ (2,008) ​ — ​ 4 ​ 42 ​ 5,902 Tax exempt ​ 58 ​ 40 ​ — ​ — ​ (4) ​ 94 Commercial and industrial ​ 3,137 ​ 2,996 ​ — ​ 1 ​ (1,094) ​ 5,040 Residential real estate ​ 5,010 ​ 1,732 ​ (40) ​ 13 ​ (146) ​ 6,569 Home equity ​ 285 ​ 603 ​ (22) ​ 11 ​ (54) ​ 823 Consumer other ​ 121 ​ (39) ​ (1) ​ 1 ​ (1) ​ 81 Total ​ $ 19,082 ​ $ 5,228 ​ $ (216) ​ $ 48 ​ $ (489) ​ $ 23,653 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ Balance at ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning of ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at (in thousands) Period Charge Offs Recoveries Provision End of Period Commercial construction ​ $ 317 ​ $ — ​ $ — ​ $ 78 ​ $ 395 Commercial real estate owner occupied ​ 2,368 ​ — ​ — ​ (882) ​ 1,486 Commercial real estate non-owner occupied ​ 4,695 ​ (871) ​ 25 ​ 1,465 ​ 5,314 Tax exempt ​ 67 ​ — ​ — ​ (10) ​ 57 Commercial and industrial ​ 3,262 ​ (179) ​ 9 ​ 231 ​ 3,323 Residential real estate ​ 4,213 ​ (8) ​ 7 ​ 79 ​ 4,291 Home equity ​ 320 ​ — ​ — ​ 8 ​ 328 Consumer other ​ 111 ​ (153) ​ 3 ​ 142 ​ 103 Total ​ $ 15,353 ​ $ (1,211) ​ $ 44 ​ $ 1,111 ​ $ 15,297 ​ ​ ​ Unfunded Commitments ​ The Company’s allowance for credit losses on unfunded commitments is recognized as a liability (other liabilities on the consolidated balance sheet), with adjustments to the reserve recognized in other non-interest expense in the consolidated statement of operations. The Company’s activity in the allowance for credit losses on unfunded commitments for the periods ended was as follows: ​ ​ ​ ​ ​ (in thousands) 2021 Balance at December 31, 2020 ​ $ 359 Impact of CECL adoption ​ ​ 1,616 Provision for credit losses ​ (156) Balance at March 31, 2021 ​ $ 1,819 ​ ​ ​ ​ ​ (in thousands) 2020 Balance at December 31, 2019 ​ $ 314 Provision for credit losses ​ 45 Balance at December 31, 2020 ​ $ 359 ​ Loan Origination/Risk Management: ​ Credit Quality Indicators: ​ The following are the definitions of the Company’s credit quality indicators: ​ Pass: ​ Special Mention: ​ Substandard: ​ Doubtful: ​ Loss: ​ The following tables present the Company’s loans by year of origination, loan segmentation and risk indicator as of March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ 2021 ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ Prior ​ Total Commercial construction ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 1,262 ​ $ 61,092 ​ $ 29,027 ​ $ 26,083 ​ $ — ​ $ — ​ $ 117,464 Special mention ​ — ​ — ​ — ​ — ​ — ​ — ​ — Substandard ​ — ​ — ​ — ​ — ​ — ​ — ​ — Total ​ $ 1,262 ​ $ 61,092 ​ $ 29,027 ​ $ 26,083 ​ $ — ​ $ — ​ $ 117,464 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate owner occupied ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 915 ​ $ 14,931 ​ $ 34,446 ​ $ 30,661 ​ $ 21,587 ​ $ 118,206 ​ $ 220,746 Special mention ​ — ​ — ​ 780 ​ — ​ — ​ 1,102 ​ 1,882 Substandard ​ — ​ — ​ — ​ 262 ​ 262 ​ 10,319 ​ 10,843 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ 188 ​ ​ ​ ​ ​ 188 ​ ​ 376 Total ​ $ 915 ​ $ 14,931 ​ $ 35,226 ​ $ 31,111 ​ $ 21,849 ​ $ 129,815 ​ $ 233,847 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate non-owner occupied ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 36,535 ​ $ 153,240 ​ $ 121,209 ​ $ 42,460 ​ $ 155,787 ​ $ 218,391 ​ $ 727,622 Special mention ​ — ​ — ​ — ​ 118 ​ — ​ 1,779 ​ 1,897 Substandard ​ — ​ — ​ — ​ 168 ​ 168 ​ 3,463 ​ 3,799 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 189 ​ ​ 189 Total ​ $ 36,535 ​ $ 153,240 ​ $ 121,209 ​ $ 42,746 ​ $ 155,955 ​ $ 223,822 ​ $ 733,507 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tax exempt ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 678 ​ $ 1,845 ​ $ 1,131 ​ $ 14,840 ​ $ 5,470 ​ $ 22,577 ​ $ 46,541 Special mention ​ — ​ — ​ — ​ — ​ — ​ — ​ — Substandard ​ — ​ — ​ — ​ — ​ — ​ — ​ — Total ​ $ 678 ​ $ 1,845 ​ $ 1,131 ​ $ 14,840 ​ $ 5,470 ​ $ 22,577 ​ $ 46,541 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 59,576 ​ $ 87,130 ​ $ 41,814 ​ $ 19,119 ​ $ 64,289 ​ $ 80,963 ​ $ 352,891 Special mention ​ 196 ​ 351 ​ 844 ​ 744 ​ 2,683 ​ 1,150 ​ 5,969 Substandard ​ — ​ — ​ 611 ​ 15,220 ​ 88 ​ 1,039 ​ 16,958 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 131 ​ ​ 445 ​ ​ 576 Total ​ $ 59,772 ​ $ 87,481 ​ $ 43,269 ​ $ 35,083 ​ $ 67,192 ​ $ 83,598 ​ $ 376,395 (continued) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ 2021 ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ Prior ​ Total Residential real estate ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 36,563 ​ $ 132,520 ​ $ 114,920 ​ $ 86,017 ​ $ 85,719 ​ $ 475,246 ​ $ 930,985 Nonperforming ​ — ​ — ​ — ​ 299 ​ 274 ​ 8,569 ​ 9,142 Total ​ $ 36,563 ​ $ 132,520 ​ $ 114,920 ​ $ 86,316 ​ $ 85,993 ​ $ 483,815 ​ $ 940,127 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Home equity ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 2,137 ​ $ 11,009 ​ $ 11,783 ​ $ 8,800 ​ $ 8,118 ​ $ 50,434 ​ $ 92,281 Nonperforming ​ — ​ — ​ — ​ — ​ 65 ​ 1,279 ​ 1,344 Total ​ $ 2,137 ​ $ 11,009 ​ $ 11,783 ​ $ 8,800 ​ $ 8,183 ​ $ 51,713 ​ $ 93,625 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer other ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 1,030 ​ $ 2,928 ​ $ 1,552 ​ $ 1,013 ​ $ 420 ​ $ 2,605 ​ $ 9,548 Nonperforming ​ — ​ — ​ — ​ — ​ — ​ 10 ​ 10 Total ​ $ 1,030 ​ $ 2,928 ​ $ 1,552 ​ $ 1,013 ​ $ 420 ​ $ 2,615 ​ $ 9,558 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Loans ​ $ 138,893 ​ $ 465,046 ​ $ 358,117 ​ $ 245,992 ​ $ 345,062 ​ $ 997,954 ​ $ 2,551,064 ​ The following table summarizes credit risk exposure indicators by portfolio segment, under the incurred loss methodology, as of the period indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Commercial ​ Commercial ​ Residential ​ ​ ​ ​ ​ ​ Real Estate ​ and Industrial ​ Real Estate ​ Consumer ​ Total Grade: ​ ​ ​ ​ ​ ​ Pass $ 1,053,773 ​ $ 422,016 ​ $ — ​ $ — ​ $ 1,475,789 Performing ​ ​ — ​ ​ — ​ ​ 914,749 ​ ​ 112,190 ​ ​ 1,026,939 Special mention ​ 6,075 ​ ​ 2,771 ​ ​ — ​ ​ — ​ ​ 8,846 Substandard ​ 22,267 ​ ​ 15,180 ​ ​ — ​ ​ — ​ ​ 37,447 Doubtful ​ 2,265 ​ ​ 1,100 ​ ​ — ​ ​ — ​ ​ 3,365 Loss ​ 1 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ 3 Non-performing ​ ​ — ​ ​ — ​ ​ 9,142 ​ ​ 1,354 ​ ​ 10,496 Total $ 1,084,381 ​ $ 441,069 ​ $ 923,891 ​ $ 113,544 ​ $ 2,562,885 ​ Past Dues ​ The following is a summary of past due loans for the periods ended: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 (in thousands) 30-59 60-89 90+ Total Past Due Current Total Loans Commercial construction ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 117,464 ​ $ 117,464 Commercial real estate owner occupied ​ 10 ​ — ​ 331 ​ 341 ​ 233,506 ​ 233,847 Commercial real estate non-owner occupied ​ 644 ​ 179 ​ 317 ​ 1,140 ​ 732,367 ​ 733,507 Tax exempt ​ — ​ — ​ — ​ — ​ 46,541 ​ 46,541 Commercial and industrial ​ 364 ​ — ​ 399 ​ 763 ​ 375,632 ​ 376,395 Residential real estate ​ 7,815 ​ 1,345 ​ 3,194 ​ 12,354 ​ 927,773 ​ 940,127 Home equity ​ 399 ​ 198 ​ 429 ​ 1,026 ​ 92,599 ​ 93,625 Consumer other ​ 4 ​ — ​ 100 ​ 104 ​ 9,454 ​ 9,558 Total ​ $ 9,236 ​ $ 1,722 ​ $ 4,770 ​ $ 15,728 ​ $ 2,535,336 ​ $ 2,551,064 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (in thousands) 30-59 60-89 90+ Total Past Due Current Total Loans Commercial construction ​ $ 74 ​ $ — ​ $ 1 ​ $ 75 ​ $ 117,807 ​ $ 117,882 Commercial real estate owner occupied ​ 1,309 ​ 464 ​ 438 ​ 2,211 ​ 217,006 ​ 219,217 Commercial real estate non-owner occupied ​ 503 ​ 674 ​ 624 ​ 1,801 ​ 714,975 ​ 716,776 Tax exempt ​ — ​ — ​ — ​ — ​ 47,862 ​ 47,862 Commercial and industrial ​ 161 ​ — ​ 193 ​ 354 ​ 355,330 ​ 355,684 Residential real estate ​ 9,178 ​ 2,511 ​ 3,200 ​ 14,889 ​ 980,327 ​ 995,216 Home equity ​ 1,062 ​ 614 ​ 375 ​ 2,051 ​ 98,045 ​ 100,096 Consumer other ​ 20 ​ — ​ 2 ​ 22 ​ 10,130 ​ 10,152 Total ​ $ 12,307 ​ $ 4,263 ​ $ 4,833 ​ $ 21,403 ​ $ 2,541,482 ​ $ 2,562,885 ​ Non-Accrual Loans ​ The following is a summary of non-accrual loans for the periods ended: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ ​ Nonaccrual With No ​ 90+ Days Past (in thousands) Nonaccrual Related Allowance Due and Accruing Commercial construction ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied ​ 1,576 ​ 895 ​ — Commercial real estate non-owner occupied ​ 930 ​ 742 ​ 50 Tax exempt ​ — ​ — ​ — Commercial and industrial ​ 1,067 ​ 641 ​ 15 Residential real estate ​ 9,142 ​ 3,405 ​ 24 Home equity ​ 1,344 ​ 352 ​ — Consumer other ​ 10 ​ — ​ 100 Total ​ $ 14,069 ​ $ 6,035 ​ $ 189 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Nonaccrual With No ​ 90+ Days Past (in thousands) Nonaccrual Related Allowance Due and Accruing Commercial construction ​ $ 258 ​ $ — ​ $ — Commercial real estate owner occupied ​ 2,400 ​ 929 ​ — Commercial real estate non-owner occupied ​ 383 ​ 118 ​ — Tax exempt ​ — ​ — ​ — Commercial and industrial ​ 1,223 ​ 1,065 ​ — Residential real estate ​ 5,883 ​ 4,948 ​ — Home equity ​ 1,345 ​ 1,346 ​ 267 Consumer other ​ 58 ​ 58 ​ — Total ​ $ 11,550 ​ $ 8,464 ​ $ 267 ​ ​ ​ Collateral Dependent Loans Loans that do not share risk characteristics are evaluated on an individual basis. For loans that are individually evaluated and collateral dependent, financial loans where the Company has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral, the ACL is measured based on the difference between the fair value of the collateral and the amortized cost basis of the asset as of the measurement date. ​ The following table presents the amortized cost basis of collateral-dependent loans by loan portfolio segment for the periods ended. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 (in thousands) Real Estate Other Real Estate Other Commercial construction ​ $ — ​ $ — ​ $ 259 ​ $ — Commercial real estate owner occupied ​ 1,576 ​ — ​ 3,441 ​ — Commercial real estate non-owner occupied ​ 930 ​ — ​ 383 ​ — Tax exempt ​ — ​ — ​ — ​ — Commercial and industrial ​ 564 ​ 503 ​ 625 ​ 607 Residential real estate ​ 9,142 ​ — ​ 7,432 ​ — Home equity ​ 1,344 ​ — ​ 1,493 ​ — Consumer other ​ 10 ​ — ​ 60 ​ — Total ​ $ 13,566 ​ $ 503 ​ $ 13,693 ​ $ 607 ​ Pre Adoption of ASC 326 – Impaired Loans ​ For periods prior to the adoption of CECL, loans were considered impaired when, based on current information and events, it was probable the Company would be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. The Company identified loan relationships having aggregate balances in excess of $150 thousand with potential credit weaknesses. Such loan relationships were identified primarily through the Company's analysis of internal loan evaluations, past due loan reports, TDRs and loans adversely classified. Each loan so identified was then individually evaluated for impairment. Substantially all impaired loans have historically been collateral dependent, meaning repayment of the loan was expected or was considered to be provided solely from the sale of the loan's underlying collateral. For such loans, the Company measured impairment based on the fair value of the loan's collateral, which is generally determined utilizing current appraisals. A specific reserve was established in an amount equal to the excess, if any, of the recorded investment in each impaired loan over the fair value of its underlying collateral, less estimated costs to sell. The Company's policy was to re-evaluate the fair value of collateral dependent loans at least every twelve months unless there is a known deterioration in the collateral's value, in which case a new appraisal is obtained. ​ ​ The tables reflects the activity associated with impaired loans in 2020 prior to the adoption of CECL. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Recorded Unpaid Principal Related Average Recorded Interest (in thousands) ​ Investment ​ Balance ​ Allowance ​ Investment ​ Income Recognized With no related allowance: ​ ​ ​ ​ ​ Construction and land development ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Other commercial real estate ​ 2,001 ​ 2,047 ​ — ​ 1,610 ​ — Commercial ​ 1,095 ​ 1,254 ​ — ​ 1,140 ​ 4 Agricultural ​ 361 ​ 150 ​ — ​ 114 ​ 2 Tax exempt loans ​ — ​ — ​ — ​ — ​ — Residential real estate ​ 2,745 ​ 3,165 ​ — ​ 1,077 ​ 17 Home equity ​ — ​ — ​ — ​ — ​ — Other consumer ​ — ​ — ​ — ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ Construction and land development ​ 258 ​ 258 ​ 205 ​ 203 ​ — Other commercial real estate ​ 1,963 ​ 2,108 ​ 1,038 ​ 1,973 ​ 17 Commercial ​ 282 ​ 289 ​ 164 ​ 73 ​ — Agricultural ​ — ​ — ​ — ​ — ​ — Tax exempt loans ​ — ​ — ​ — ​ — ​ — Residential real estate ​ 887 ​ 944 ​ 106 ​ 1,865 ​ 37 Home equity ​ 13 ​ 13 ​ — ​ 12 ​ 1 Other consumer ​ — ​ — ​ — ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ ​ ​ ​ ​ Commercial real estate ​ 4,222 ​ 4,413 ​ 1,243 ​ 3,786 ​ 17 Commercial and industrial ​ 1,738 ​ 1,693 ​ 164 ​ 1,327 ​ 6 Residential real estate ​ 3,632 ​ 4,109 ​ 106 ​ 2,942 ​ 54 Consumer ​ 13 ​ 13 ​ — ​ 12 ​ 1 Total impaired loans ​ $ 9,605 ​ $ 10,228 ​ $ 1,513 ​ $ 8,067 ​ $ 78 ​ Troubled Debt Restructuring Loans The Company’s loan portfolio also includes certain loans that have been modified in a Troubled Debt Restructuring ("TDR"), where economic concessions have been granted to borrowers who have experienced or are expected to experience financial difficulties. These concessions typically result from the Company’s loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance, or other actions. Certain TDRs are classified as non-performing at the time of restructure and may only be returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period, generally six months. TDRs are evaluated individually for impairment and may result in a specific allowance amount allocated to an individual loan. ​ The following tables include the recorded investment and number of modifications identified during the periods ended. The table includes the recorded investment in the loans prior to a modification and also the recorded investment in the loans after the loans were restructured. Modifications may include adjustments to interest rates, payment amounts, extensions of maturity, court ordered concessions or other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. There were no modifications qualifying as TDR’s for the three months ended March 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ Pre-Modification ​ Post-Modification ​ ​ ​ ​ ​ Number of ​ Outstanding ​ Outstanding ​ ​ ​ (in thousands) Modifications Balance Balance Reserve Commercial construction ​ — ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied — ​ — ​ — ​ — Commercial real estate non-owner occupied — ​ — ​ — ​ — Tax exempt — ​ — ​ — ​ — Commercial and industrial — ​ — ​ — ​ — Residential real estate — ​ — ​ — ​ — Home equity — ​ — ​ — ​ — Consumer other — ​ — ​ — ​ — Total — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ Pre-Modification ​ Post-Modification ​ ​ ​ ​ ​ Number of ​ Outstanding ​ Outstanding ​ ​ ​ (in thousands) Modifications Balance Balance Reserve Commercial construction ​ — ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied — ​ — ​ — ​ — Commercial real estate non-owner occupied 1 ​ 54 ​ 259 ​ — Tax exempt — ​ — ​ — ​ — Commercial and industrial 3 ​ 41 ​ 208 ​ — Residential real estate — ​ — ​ — ​ — Home equity 1 ​ 26 ​ 25 ​ — Consumer other 1 ​ 9 ​ 9 ​ — Total 6 ​ $ 130 ​ $ 501 ​ $ — ​ ​ The following tables summarize the types of loan concessions made for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ March 31, 2020 ​ ​ Post-Modification ​ Post-Modification ​ ​ Number of ​ Outstanding ​ Number of ​ Outstanding (in thousands) ​ Modifications ​ Balance ​ Modifications ​ Balance Interest rate, forbearance and maturity concession — ​ $ — 4 ​ $ 467 Forbearance and interest only payments — ​ — 1 ​ 25 Maturity concession — ​ — 1 ​ 9 Total — ​ $ — 6 ​ $ 501 ​ For the three ended March 31, 2021 there were no loans that were restructured that had subsequently defaulted during the period. The evaluation of certain loans individually for specific impairment includes loans that were previously classified as TDRs or continue to be classified as TDRs. ​ Modifications in response to COVID-19 The Company began offering short-term loan modifications to assist borrowers during the COVID-19 national emergency. The CARES Act along with a joint agency statement issued by banking agencies, provides that short-term modifications made in response to COVID-19 do not need to be accounted for as a TDR. Accordingly, the Company does not account for such loan modifications as TDRs. See Note 1 - Basis of Presentation ​ Foreclosure Residential mortgage loans collateralized by real estate that are in the process of foreclosure as of March 31, 2021 and December 31, 2020 totaled $343 thousand and $917 thousand, respectively. ​ Mortgage Banking The Company had identified and designated loans with an unpaid principal balance of $10.1 million and $23.7 million as residential loans held for sale at March 31, 2021 and December 31, 2020, respectively. The interest rate exposure on loans held for sale are mitigated through forward delivery commitments with certain approved secondary market investors. Forward delivery commitments were $31.3 million, and $50.6 million, respectively. Refer to Note 8 for further discussion of the Company's forward delivery commitments. ​ For the periods ended March 31, 2021 and December 31, 2020, the Company sold $69.2 million and $70.4 million, respectively, of residential mortgage loans on the secondary market, which resulted in a net gain on sale of loans (net of costs, including direct and indirect origination costs) of $1.9 million and $2.2 million, respectively. ​ The Company sells residential loans on the secondary market with the Company primarily retaining the servicing of these loans. Servicing sold loans helps to maintain customer relationships and the Company earns fees over the servicing period. Loans serviced for others are not included in the accompanying consolidated balance sheets. The risks inherent in servicing assets relate primarily to level of prepayments that result from shifts in interest rates. The Company obtains third party valuations of its servicing assets portfolio quarterly, which assumptions are reflected in Fair Value disclosures.

BORROWED FUNDS

BORROWED FUNDS	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
BORROWED FUNDS	​ NOTE 4. BORROWED FUNDS ​ Borrowed funds at March 31, 2021 and December 31, 2020 are summarized, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ (dollars in thousands) Carrying Value Average Rate ​ Carrying Value Average Rate Short-term borrowings ​ ​ ​ ​ ​ ​ ​ Advances from the FHLB ​ $ 85,329 0.51 % ​ $ 65,676 1.19 % Other borrowings ​ 24,276 0.16 ​ ​ 27,779 0.15 ​ Total short-term borrowings ​ 109,605 0.26 ​ ​ 93,455 0.44 ​ Long-term borrowings ​ ​ ​ ​ Advances from the FHLB ​ 182,605 1.73 ​ ​ 182,607 1.73 ​ Subordinated borrowings ​ 60,003 4.45 ​ ​ 59,961 4.34 ​ Total long-term borrowings ​ 242,608 2.40 ​ ​ 242,568 2.37 ​ Total ​ $ 352,213 1.20 % ​ $ 336,023 1.41 % ​ Short-term debt includes Federal Home Loan Bank of Boston (“FHLB”) advances with a maturity of less than one year. The Company also maintains a $1.0 million secured line of credit with the FHLB that bears a daily adjustable rate calculated by the FHLB. There was no outstanding balance on the FHLB line of credit for the periods ended March 31, 2021 and December 31, 2020. ​ The Company has the capacity to borrow funds on a secured basis utilizing the Borrower in Custody program and the Discount Window at the Federal Reserve Bank of Boston (the “FRB”). At March 31, 2021, the Company’s available secured line of credit at the FRB was $73.8 million. The Company has pledged certain loans and securities to the FRB to support this arrangement. There were no outstanding advances with the FRB for the periods ended March 31, 2021 December 31, 2020. ​ The Company maintains, with a correspondent bank, an unused unsecured federal funds line of credit that has an aggregate overnight borrowing capacity of $50.0 million as of March 31, 2021 and December 31, 2020. There was no outstanding balance on the line of credit as of March 31, 2021 and December 31, 2020. ​ Long-term FHLB advances consist of advances with a maturity of more than one year. The advances outstanding at March 31, 2021 include callable advances of $20.0 million and amortizing advances of $305 thousand. The advances outstanding at December 31, 2020 included $20.0 million of callable advances and $307 million of amortizing advances. All FHLB borrowings, including the line of credit, are secured by a blanket security agreement on certain qualified collateral, principally all residential first mortgage loans and certain securities. ​ A summary of maturities of FHLB advances as of March 31, 2021 is, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ Weighted Average (in thousands, except rates) ​ Amount ​ Rate 2021 ​ $ 85,329 0.51 % 2022 ​ 75,000 1.87 ​ 2023 ​ 80,000 1.77 ​ 2024 ​ 7,300 1.16 ​ 2025 ​ 20,000 1.21 ​ 2026 and thereafter ​ 305 1.79 ​ Total FHLB advances ​ $ 267,934 1.34 % ​ On November 26, 2019, the Company executed a Subordinated Note Purchase Agreement with an aggregate of $40.0 million of subordinated notes (the "Notes") to accredited investors. The Notes have a maturity date of December 1, 2029 and bear a fixed interest rate of 4.625% through December 1, 2024 payable semi-annually in arrears. From December 1, 2024 and thereafter the interest rate shall be reset quarterly to an interest rate per annum equal to the then current three-month SOFR plus 3.27%. The Company has the option beginning with the interest payment date of December 1, 2024, and on any scheduled payment date thereafter, to redeem the Notes, in whole or in part upon prior approval of the Federal Reserve. Netted with subordinated borrowings is amortized subordinated debt issuance costs of $617 thousand as of March 31, 2021 and issuance costs of $659 thousand net of amortization as of December 31, 2020. ​ The Company also has $20.6 million in floating Junior Subordinated Deferrable Interest Debentures ("Debentures") issued by NHTB Capital Trust II ("Trust II") and NHTB Capital Trust III ("Trust III"), which are both Connecticut statutory trusts. The Debentures were issued on March 30, 2004, carry a variable interest rate of 3-month LIBOR plus 2.79%, and mature in 2034. The debt is callable by the Company at the time when any interest payment is made. Trust II and Trust III are considered variable interest entities for which the Company is not the primary beneficiary. Accordingly, Trust II and Trust III are not consolidated into the Company’s financial statements.

DEPOSITS

DEPOSITS	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
DEPOSITS	​ NOTE 5. DEPOSITS ​ A summary of time deposits is, as follows: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 December 31, 2020 Time less than $100,000 ​ $ 309,408 ​ $ 325,646 Time $100,000 through $250,000 ​ 201,996 ​ 278,940 Time $250,000 or more ​ 127,032 ​ 93,775 Total ​ $ 638,436 ​ $ 698,361 ​ At March 31, 2021 and December 31, 2020, the scheduled maturities by year for time deposits are, as follows: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 ​ December 31, 2020 Within 1 year ​ $ 525,701 ​ $ 574,007 Over 1 year to 2 years ​ 56,988 ​ 61,584 Over 2 years to 3 years ​ 37,070 ​ 41,145 Over 3 years to 4 years ​ 10,682 ​ 12,875 Over 4 years to 5 years ​ 7,989 ​ 8,728 Over 5 years ​ 6 ​ 22 Total ​ $ 638,436 ​ $ 698,361 ​ Included in time deposits are brokered deposits of $136.6 million and $193.7 million at March 31, 2021 and December 31, 2020, respectively. Also included in time deposits are reciprocal deposits of $140.7 million and $125.0 million at March 31, 2021 and December 31, 2020, respectively.

CAPITAL RATIOS AND SHAREHOLDERS

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY	​ ​ NOTE 6. CAPITAL RATIOS AND SHAREHOLDERS’ EQUITY ​ The actual and required capital ratios are, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Regulatory ​ Regulatory ​ ​ March 31, ​ Minimum to be ​ December 31, ​ Minimum to be ​ ​ 2021 ​ "Well-Capitalized" ​ 2020 ​ "Well-Capitalized" Company (consolidated) ​ Total capital to risk-weighted assets 13.83 % 10.50 % 13.56 % 10.50 % Common equity tier 1 capital to risk-weighted assets 10.55 7.00 10.49 7.00 ​ Tier 1 capital to risk-weighted assets 11.34 8.50 11.28 8.50 ​ Tier 1 capital to average assets 8.27 5.00 8.12 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Bank ​ Total capital to risk-weighted assets 13.62 % 10.50 % 13.27 % 10.50 % Common equity tier 1 capital to risk-weighted assets 12.66 7.00 12.52 7.00 ​ Tier 1 capital to risk-weighted assets 12.66 8.50 12.52 8.50 ​ Tier 1 capital to average assets 9.23 5.00 9.02 5.00 ​ ​ At each date shown, the Company and the Bank met the conditions to be classified as “well-capitalized” under the relevant regulatory framework. To be categorized as "well-capitalized," an institution must maintain minimum total risk-based, Tier 1 risk-based, and Tier 1 leverage ratios as set forth in the table above. ​ The Company and the Bank are subject to the Basel III rule that requires the Company and the Bank to assess their Common equity tier 1 capital to risk-weighted assets and the Company and the Bank each exceed the minimum to be "well-capitalized." Effective January 1, 2019 all banking organizations must maintain a minimum Common equity tier 1 risk-based capital ratio of 7.0%, a minimum Tier 1 risk-based capital ratio of 8.5% and a minimum Total risk-based capital ratio of 10.5%. ​ Accumulated other comprehensive income (loss) ​ Components of accumulated other comprehensive income is, as follows: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 December 31, 2020 Accumulated other comprehensive income, before tax: ​ ​ Net unrealized gain on AFS securities ​ $ 5,884 ​ $ 13,069 Net unrealized gain on hedging derivatives ​ 485 ​ 3,144 Net unrealized loss on post-retirement plans ​ (1,850) ​ (1,850) ​ ​ ​ ​ ​ ​ ​ Income taxes related to items of accumulated other comprehensive income: ​ ​ Net unrealized gain on AFS securities ​ (1,374) ​ (3,046) Net unrealized gain on hedging derivatives ​ (113) ​ (733) Net unrealized loss on post-retirement plans ​ 432 ​ 432 Accumulated other comprehensive income ​ $ 3,464 ​ $ 11,016 ​ The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Before Tax Tax Effect Net of Tax Three Months Ended March 31, 2021 ​ ​ ​ Net unrealized loss on AFS securities: ​ ​ ​ Net unrealized loss arising during the period ​ $ (7,185) ​ $ 1,672 ​ $ (5,513) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on AFS securities ​ (7,185) ​ 1,672 ​ (5,513) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized gain on hedging derivatives: ​ ​ ​ ​ Net unrealized loss arising during the period ​ (2,659) ​ 620 ​ (2,039) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on cash flow hedging derivatives ​ (2,659) ​ 620 ​ (2,039) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on post-retirement plans: ​ ​ ​ ​ Net unrealized loss arising during the period ​ — ​ — ​ — Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on post-retirement plans ​ — ​ — ​ — Other comprehensive loss ​ $ (9,844) ​ $ 2,292 ​ $ (7,552) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ Net unrealized gain on AFS securities: ​ ​ ​ Net unrealized gain arising during the period ​ $ 5,492 ​ $ (1,378) ​ $ 4,114 Less: reclassification adjustment for gains (losses) realized in net income ​ 135 ​ (32) ​ 103 Net unrealized gain on AFS securities ​ 5,357 ​ (1,346) ​ 4,011 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on derivative hedgess: ​ ​ ​ ​ Net unrealized loss arising during the period ​ (2,382) ​ 650 ​ (1,732) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on cash flow derivative hedges ​ (2,382) ​ 650 ​ (1,732) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on post-retirement plans: ​ ​ ​ ​ Net unrealized loss arising during the period ​ — ​ — ​ — Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on post-retirement plans ​ — ​ — ​ — Other comprehensive income ​ $ 2,975 ​ $ (696) ​ $ 2,279 ​ ​ The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax impacts, for the three months ended March 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized Net loss on Net unrealized ​ ​ ​ ​ gain ​ effective cash ​ loss ​ ​ ​ ​ ​ on AFS ​ flow hedging ​ on pension ​ ​ ​ (in thousands) ​ Securities ​ derivatives ​ plans ​ Total Three Months Ended March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 10,021 ​ $ 2,413 ​ $ (1,418) ​ $ 11,016 Other comprehensive loss before reclassifications ​ (5,513) ​ (2,039) ​ — ​ (7,552) Less: amounts reclassified from accumulated other comprehensive income ​ — ​ — ​ — ​ — Total other comprehensive loss ​ (5,513) ​ (2,039) ​ — ​ (7,552) Balance at end of period ​ $ 4,508 ​ $ 374 ​ $ (1,418) ​ $ 3,464 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 5,549 ​ $ (481) ​ $ (1,157) ​ $ 3,911 Other comprehensive gain (loss) before reclassifications ​ 4,114 ​ (1,732) ​ — ​ 2,382 Less: amounts reclassified from accumulated other comprehensive income ​ 103 ​ — ​ — ​ 103 Total other comprehensive income (loss) ​ 4,011 ​ (1,732) ​ — ​ 2,279 Balance at end of period ​ $ 9,560 ​ $ (2,213) ​ $ (1,157) ​ $ 6,190 ​ The following tables presents the amounts reclassified out of each component of accumulated other comprehensive income for three months ended March 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ Affected Line Item where (in thousands) 2021 2020 Net Income is Presented Net realized gains on AFS securities: ​ ​ ​ ​ ​ ​ Before tax ​ $ — ​ $ 135 ​ Non-interest income Tax effect ​ — ​ (32) ​ Tax expense Total reclassifications for the period ​ $ — ​ $ 103 ​ Net of tax (1) Net realized gains before tax include no realized gains and losses for the three months ended March 31, 2021 and gross realized gains of $146 thousand and realized losses of $11 thousand for the three months ended March 31, 2020. ..

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
EARNINGS PER SHARE	​ NOTE 7. EARNINGS PER SHARE ​ The following table presents the calculation of earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, (in thousands, except per share and share data) 2021 2020 Net income ​ $ 9,480 ​ $ 7,721 ​ ​ ​ ​ ​ ​ ​ Average number of basic common shares outstanding ​ 14,933,554 ​ 15,558,132 Plus: dilutive effect of stock options and awards outstanding ​ 73,161 ​ 34,463 Average number of diluted common shares outstanding (1) ​ 15,006,715 ​ 15,592,595 ​ ​ ​ ​ ​ ​ ​ Earnings per share: ​ ​ Basic ​ $ 0.63 ​ $ 0.50 Diluted ​ $ 0.63 ​ $ 0.50 (1) Average diluted shares outstanding are computed using the treasury stock method.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES	​ ​ NOTE 8. DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES ​ The Company uses derivative instruments to minimize fluctuations in earnings and cash flows caused by interest rate volatility. The Company’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so the changes in interest rates do not have a significant effect on net interest income. Thus, all of the Company's derivative contracts are considered to be interest rate contracts. ​ The Company recognizes its derivative instruments on the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Company designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or loss. ​ The Company offers derivative products in the form of interest rate swaps, to commercial loan customers to facilitate their risk management strategies. These instruments are executed through Master Netting Arrangements ("MNA") with financial institution counterparties or Risk Participation Agreements ("RPA") with commercial bank counterparties, for which the Company assumes a pro rata share of the credit exposure associated with a borrower's performance related to the derivative contract with the counterparty. ​ The following tables present information about derivative assets and liabilities at March 31, 2021 and December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Notional ​ Average ​ Fair Value ​ Location Fair ​ ​ Amount ​ Maturity ​ Asset (Liability) Value Asset ​ (in thousands) (in years) (in thousands) (Liability) Cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on wholesale fundings ​ $ 75,000 ​ 3.8 ​ $ (1,379) ​ Other liabilities Interest rate swap on variable rate loans ​ ​ 50,000 ​ ​ 5.0 ​ ​ (278) ​ Other liabilities Total cash flow hedges ​ 125,000 ​ 4.3 ​ ​ (1,657) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on securities ​ 37,190 ​ 8.3 ​ 262 ​ Other assets Total fair value hedges ​ 37,190 ​ 8.3 ​ ​ 262 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward sale commitments ​ 31,382 ​ 0.2 ​ (85) ​ Other liabilities Customer Loan Swaps-MNA Counterparty ​ ​ 260,792 ​ ​ 6.8 ​ ​ (9,944) ​ Other liabilities Customer Loan Swaps-RPA Counterparty ​ ​ 119,285 ​ ​ 7.6 ​ ​ (5,482) ​ Other liabilities Customer Loan Swaps-Customer ​ ​ 380,077 ​ ​ 7.1 ​ ​ 15,426 ​ Other assets Total economic hedges ​ 791,536 ​ ​ ​ ​ (85) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate lock commitments ​ 6,735 ​ 0.2 ​ 46 ​ Other assets Total non-hedging derivatives ​ 6,735 ​ 0.2 ​ ​ 46 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 960,461 ​ ​ ​ ​ $ (1,434) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Notional ​ Average ​ Fair Value ​ Location Fair ​ ​ Amount ​ Maturity ​ Asset (Liability) Value Asset ​ (in thousands) (in years) (in thousands) (Liability) Cash flow hedges: ​ ​ ​ ​ ​ Interest rate swap on wholesale fundings ​ $ 75,000 ​ 4.0 ​ $ (2,664) ​ Other liabilities Total cash flow hedges ​ 75,000 ​ ​ ​ ​ (2,664) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on securities ​ 37,190 ​ 8.6 ​ 2,789 ​ Other assets Total fair value hedges ​ 37,190 ​ ​ ​ ​ 2,789 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward sale commitments ​ ​ 50,629 ​ 0.2 ​ (95) ​ Other liabilities Customer Loan Swaps-MNA Counterparty ​ ​ 235,947 ​ ​ 6.8 ​ ​ (15,938) ​ Other liabilities Customer Loan Swaps-RPA Counterparty ​ ​ 119,285 ​ ​ 7.9 ​ ​ (9,957) ​ Other liabilities Customer Loan Swaps-Customer ​ ​ 355,232 ​ ​ 7.1 ​ ​ 25,895 ​ Other assets Total economic hedges ​ 761,093 ​ ​ ​ ​ (95) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate lock commitments ​ 3,320 ​ 0.1 ​ 22 ​ Other assets Total non-hedging derivatives ​ 3,320 ​ ​ ​ ​ 22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 876,603 ​ ​ ​ ​ $ 52 ​ ​ ​ As of March 31, 2021 and December 31, 2020, the following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Amount of Fair ​ ​ Location of Hedged Item on ​ Carrying Amount of Hedged ​ Value Hedging Adjustment in ​ Balance Sheet Assets (Liabilities) Carrying Amount March 31, 2021 ​ ​ Interest rate swap on securities Securities Available for Sale ​ $ 39,070 ​ $ 1,880 ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Interest rate swap on securities Securities Available for Sale ​ $ 40,209 ​ $ 3,019 ​ Information about derivative assets and liabilities for March 31, 2021 and 2020, follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021 ​ Amount of ​ Amount of ​ ​ ​ ​ Gain (Loss) ​ ​ ​ Gain (Loss) ​ ​ ​ ​ ​ ​ Recognized in ​ ​ ​ Reclassified ​ Location of ​ Amount of ​ ​ Other ​ Location of Gain (Loss) ​ from Other ​ Gain (Loss) ​ Gain (Loss) ​ ​ Comprehensive ​ Reclassified from Other ​ Comprehensive ​ Recognized in ​ Recognized (in thousands) Income Comprehensive Income Income Income in Income Cash flow hedges: ​ ​ ​ Interest rate swap on wholesale funding ​ $ 987 ​ Interest expense ​ $ (188) Interest expense ​ $ (188) Interest rate swap on variable rate loans ​ ​ (213) ​ Interest income ​ ​ 8 ​ Interest income ​ ​ 8 Total cash flow hedges ​ 774 ​ ​ (180) ​ (180) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ Interest rate swap on securities ​ (2,813) Interest income ​ (137) Interest income ​ (137) Total fair value hedges ​ (2,813) ​ ​ (137) ​ (137) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ Forward commitments ​ — Other income ​ 10 Other income ​ 10 Total economic hedges ​ — ​ ​ 10 ​ 10 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ Interest rate lock commitments ​ — Other income ​ 24 Other income ​ 24 Total non-hedging derivatives ​ — ​ ​ 24 ​ 24 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ (2,039) ​ ​ ​ $ (283) ​ $ (283) ​ The Company expects approximately $390 thousand of losses (pre-tax) related to the Company’s cash flow hedges to be reclassified to earnings from AOCI over the next 12 months. This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of March 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ Amount of ​ Amount of ​ ​ ​ ​ Gain (Loss) ​ ​ ​ Gain (Loss) ​ ​ ​ ​ ​ ​ Recognized in ​ ​ ​ Reclassified ​ Location of ​ Amount of ​ ​ Other ​ Location of Gain (Loss) ​ from Other ​ Gain (Loss) ​ Gain (Loss) ​ ​ Comprehensive ​ Reclassified from Other ​ Comprehensive ​ Recognized in ​ Recognized (in thousands) ​ Income ​ Comprehensive Income ​ Income ​ Income ​ in Income Cash flow hedges: ​ ​ ​ Interest rate swap on wholesale funding ​ $ (3,945) Interest expense ​ $ (1) Interest expense ​ $ (1) Total cash flow hedges ​ ​ (3,945) ​ ​ ​ (1) ​ ​ (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ Interest rate swap on securities ​ 2,213 Interest income ​ (18) Interest income ​ (18) Total economic hedges ​ ​ 2,213 ​ ​ ​ (18) ​ (18) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ Forward commitments ​ — Other income ​ (11) Other income ​ (11) Total economic hedges ​ ​ — ​ ​ ​ (11) ​ (11) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ Interest rate lock commitments ​ — Other income ​ (34) Other Income ​ (34) Total non-hedging derivatives ​ ​ — ​ ​ ​ (34) ​ (34) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ (1,732) ​ $ (64) ​ $ (64) ​ Cash flow hedges ​ Interest rate swaps on wholesale funding In March and November 2019 and April 2020, the Company entered into interest rate swaps on wholesale borrowings (the "SWAPS") to limit its exposure to rising interest rates over a five year term on 3-month FHLB borrowings or brokered certificates, or a combination thereof at each maturity date. Under the terms of the agreement, the Company has two swaps each with a $50.0 million notional amount and pays a fixed interest rate of 2.46% and 1.53% respectively and one swap with a $25.0 million notional amount and pays a fixed rate of 0.59%. The financial institution counterparty pays the Company interest on the three-month LIBOR rate. The Company designated the swap as a cash flow hedge. ​ Based on direct and indirect events resulting from COVID-19 pandemic, the Company determined that $50 million of wholesale fundings were no longer necessary. As a result of the unprecedented nature of the pandemic the FASB staff believes that it would be acceptable for a company to determine that missed forecasts related to the effects of the COVID-19 pandemic need not be considered when determining whether it has exhibited a pattern of missing forecasts that would call into question its ability to accurately predict forecasted transactions and the propriety of using cash flow hedge accounting in the future for similar transactions. The FASB staff believes that this guidance did not contemplate forecasts changing so rapidly as a result of a pandemic. The March 2019 hedge with a $50.0 million notional amount and fixed rate of 2.46% was terminated in the fourth quarter of 2020, with $3.9 million loss recognized in acquisition, conversion, and other expenses as a result of the reclassification from other comprehensive income. ​ Interest rate swap on variable rate loans In March 2021, the Company entered into a contract with a counterparty to manage interest rate risk associated with its variable rate loans. The instrument is specifically designed to hedge the risk of changes in its cash flows from interest receipts attributable to changes in a contractually specified interest rate, on an amount of the Company’s variable rate loan assets equal to $50 million. The interest rate swap will effectively fix the Company’s interest rate on $50 million of 1 month USD-LIBOR-BBA (or LIBOR less two days) based loan assets at 0.806% plus the credit spread on the loans that reprices on weighted average basis. The Company designated the swap as a cash flow hedge. ​ Fair value hedges ​ Interest rate swap on securities For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged asset or liability attributable to the hedged risk are recognized in current earnings. The Company utilizes interest rate swaps designated as fair value hedges to mitigate the effect of changing interest rates on the fair values of fixed rate callable securities available-for-sale. The hedging strategy on securities converts the fixed interest rates to LIBOR-based variable interest rates. These derivatives are designated as partial term hedges of selected cash flows covering specified periods of time prior to the call dates of the hedged securities. During 2019, the Company entered into eight swap transactions with a notional amount of $37.2 million designated as fair value hedges. These derivatives are intended to protect against the effects of changing interest rates on the fair values of fixed rate securities. The fixed rates on the transactions have a weighted average of 1.696%. ​ Economic hedges ​ Forward sale commitments The Company utilizes forward sale commitments on residential mortgage loans to hedge interest rate risk and the associated effects on the fair value of interest rate lock commitments and loans originated for sale. The forward sale commitments are accounted for as derivatives. The Company typically uses a combination of best efforts and mandatory delivery contracts. The contracts are loan sale agreements where the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. Generally, the Company may enter into contracts just prior to the loan closing with a customer. ​ Customer loan derivatives The Company enters into customer loan derivatives to facilitate the risk management strategies for commercial banking customers. The Company mitigates this risk by entering into equal and offsetting loan swap agreements with highly rated third-party financial institutions. The loan swap agreements are free standing derivatives and are recorded at fair value in the Company's consolidated balance sheet. The Company is party to master netting arrangements with its financial institutional counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. ​ The master netting arrangements provide for a single net settlement of all loan swap agreements, as well as collateral or cash funds, in the event of default on, or termination of, any one contract. Collateral is provided by cash or securities received or posted by the counterparty with net liability positions, respectively, in accordance with contract thresholds. Currently, the Company has posted cash of $12.7 million with counterparties. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Offset in the Consolidated Balance Sheet ​ ​ Derivative ​ ​ ​ Cash Collateral ​ ​ ​ (in thousands) Liabilities Derivative Assets Pledged Net Amount As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ Customer Loan Derivatives: ​ ​ ​ ​ MNA counterparty ​ $ (9,944) ​ $ 9,944 ​ $ 12,700 ​ $ 12,700 RPA counterparty ​ (5,482) ​ 5,482 ​ — ​ — Total ​ $ (15,426) ​ $ 15,426 ​ $ 12,700 ​ $ 12,700 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Offset in the Consolidated Balance Sheet ​ ​ Derivative ​ ​ ​ Cash Collateral ​ ​ ​ (in thousands) Liabilities Derivative Assets Pledged Net Amount As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ Customer Loan Derivatives: ​ ​ ​ ​ MNA counterparty ​ $ (15,938) ​ $ 15,938 ​ $ 23,450 ​ $ 23,450 RPA counterparty ​ (9,957) ​ 9,957 ​ — ​ — Total ​ $ (25,895) ​ $ 25,895 ​ $ 23,450 ​ $ 23,450 ​ ​ Non-hedging derivatives ​ Interest rate lock commitments The Company enters into interest rate lock commitments (“IRLCs”) for residential mortgage loans, which commit the Company to lend funds to a potential borrower at a specific interest rate and within a specified period of time. IRLCs relate to the origination of residential mortgage loans that are held for sale are considered derivative financial instruments under applicable accounting guidance. Outstanding IRLCs expose the Company to the risk that the price of the mortgage loans underlying the commitments may decline due to increases in mortgage interest rates from inception of the rate lock to the funding of the loan. The IRLCs are free standing derivatives which are carried at fair value with changes recorded in non-interest income in the Company’s Consolidated Statements of Income. Changes in the fair value of IRLCs subsequent to inception are based on; (i) changes in the fair value of the underlying loan resulting from the fulfillment of the commitment and (ii) changes in the probability when the loan will fund within the terms of the commitment, which is affected primarily by changes in interest rates and the passage of time.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	​ ​ NOTE 9. FAIR VALUE MEASUREMENTS ​ A description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to all of the Company’s financial assets and financial liabilities that are carried at fair value. ​ Recurring Fair Value Measurements ​ The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ Level 1 Level 2 Level 3 Total (in thousands) ​ Inputs ​ Inputs ​ Inputs ​ Fair Value Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ — ​ $ 214,607 ​ $ — ​ $ 214,607 US Government agency ​ — ​ 76,185 ​ — ​ 76,185 Private label ​ — ​ 47,541 ​ — ​ 47,541 Obligations of states and political subdivisions thereof ​ — ​ 187,863 ​ — ​ 187,863 Corporate bonds ​ — ​ 100,207 ​ — ​ 100,207 Derivative assets ​ — ​ 15,426 ​ 46 ​ 15,472 Derivative liabilities ​ — ​ (16,805) ​ (85) ​ (16,890) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total (in thousands) ​ Inputs ​ Inputs ​ Inputs ​ Fair Value Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ — ​ $ 212,390 ​ $ — ​ $ 212,390 US Government agency ​ — ​ 85,632 ​ — ​ 85,632 Private label ​ — ​ 19,709 ​ — ​ 19,709 Obligations of states and political subdivisions thereof ​ — ​ 169,004 ​ — ​ 169,004 Corporate bonds ​ — ​ 98,311 ​ — ​ 98,311 Derivative assets ​ — ​ 28,684 ​ 22 ​ 28,706 Derivative liabilities ​ — ​ (28,559) ​ (95) ​ (28,654) ​ Securities Available for Sale: ​ Derivative Assets and Liabilities ​ Cash Flow and Fair Value Hedges. ​ Interest Rate Lock Commitments. ​ Forward Sale Commitments . ​ Customer Loan Derivatives. ​ Although the Company has determined that the majority of the inputs used to value its customer loan derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2021, the Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. ​ The table below presents the changes in Level 3 assets and liabilities that were measured at fair value on a recurring basis for the three months ended March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets (Liabilities) ​ ​ Interest Rate Lock ​ Forward (in thousands) Commitments Commitments Three Months Ended March 31, 2021 ​ ​ ​ ​ Balance at beginning of period ​ $ 22 ​ $ (95) Realized gain recognized in non-interest income ​ 24 ​ 10 Balance at end of period ​ $ 46 ​ $ (85) ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ Balance at beginning of period ​ $ 59 ​ $ (84) Realized gain recognized in non-interest income ​ 34 ​ 11 Balance at end of period ​ $ 93 ​ $ (73) ​ Quantitative information about the significant unobservable inputs within Level 3 recurring assets and liabilities is, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ Fair Value ​ Fair Value ​ ​ ​ ​ ​ Unobservable ​ (in thousands, except ratios) March 31, 2021 December 31, 2020 ​ Valuation Techniques Unobservable Inputs Input Value ​ Assets (Liabilities) ​ ​ ​ ​ ​ ​ ​ ​ Interest Rate Lock Commitment $ 46 ​ $ 22 ​ Historical trend Closing Ratio ​ 90 % ​ ​ ​ ​ ​ ​ Pricing Model ​ Origination Costs, per loan ​ $ 1.7 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward Commitments ​ (85) ​ (95) ​ Quoted prices for similar loans in active markets Freddie Mac pricing system ​ Pair-off contract price ​ Total ​ $ (39) ​ $ (73) ​ ​ ​ ​ Non-Recurring Fair Value Measurements ​ The Company is required, on a non-recurring basis, to adjust the carrying value or provide valuation allowances for certain assets using fair value measurements in accordance with GAAP. The following is a summary of applicable non-recurring fair value measurements: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurement ​ ​ March 31, 2021 ​ December 31, 2020 ​ March 31, 2021 ​ Date as of March 31, 2021 ​ ​ Level 3 ​ Level 3 ​ Total ​ Level 3 (in thousands) Inputs Inputs Gains (Losses) Inputs Assets ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ $ 10,556 ​ $ 8,746 ​ $ (1,810) ​ March 2021 Capitalized servicing rights ​ 4,693 ​ ​ 3,605 ​ (1,088) March 2021 Premises held for sale ​ 971 ​ ​ 962 ​ (9) December 2020 Total ​ $ 16,220 ​ $ 13,313 ​ $ (2,907) ​ There are no liabilities measured at fair value on a non-recurring basis in 2021 and 2020. ​ ​ Quantitative information about the significant unobservable inputs within Level 3 non-recurring assets is, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands, except ratios) Fair Value March 31, 2021 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets ​ ​ ​ ​ Individually evaluated loans ​ $ 7,238 Fair value of collateral-appraised value Loss severity ​ ​ 0% to 70% ​ ​ ​ ​ ​ ​ ​ Appraised value ​ ​ $0 to $1,792 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ 3,318 Discount cash flow Discount rate ​ 2.88% to 9.50% ​ ​ ​ ​ ​ ​ ​ Cash flows ​ ​ $7 to $953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capitalized servicing rights ​ 4,693 Discounted cash flow Constant prepayment rate (CPR) ​ 13.38 ​ ​ ​ Discount rate ​ 10.04 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Premises held for sale ​ 971 Fair value of asset less selling costs Appraised value ​ ​ $220 to $386 ​ ​ ​ ​ Selling Costs ​ 6% ​ Total ​ $ 16,220 ​ ​ (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. (b) The carrying value of premises held for sale was $0.0 million as of March 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands, except ratios) Fair Value Dec 31, 2020 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ $ 6,128 ​ Fair value of collateral-appraised value ​ Loss severity ​ ​ 0% to 70% ​ ​ ​ ​ ​ ​ ​ ​ Appraised value ​ ​ $0 to $1730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ 2,618 ​ Discount cash flow ​ Discount rate ​ 3.50% to 9.50% ​ ​ ​ ​ ​ ​ ​ ​ Cash flows ​ ​ $19 to $953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capitalized servicing rights ​ 3,605 ​ Discounted cash flow ​ Constant prepayment rate (CPR) ​ 18.53% ​ ​ ​ ​ ​ ​ ​ ​ Discount rate ​ 10.05% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Premises held for sale ​ 962 ​ Fair value of asset less selling costs ​ Appraised value ​ $220 to $386 ​ ​ ​ ​ ​ ​ ​ ​ Selling Costs ​ 6% ​ Total ​ $ 13,313 ​ ​ ​ ​ ​ ​ ​ ​ (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. ​ There were no Level 1 or Level 2 non-recurring fair value measurements for the periods ended March 31, 2021 and December 31, 2020. ​ Individually evaluated loans. ​ Capitalized loan servicing rights . ​ Other real estate owned (“OREO”). ​ Premises held for sale. ​ Summary of Estimated Fair Values of Financial Instruments ​ The estimated fair values, and related carrying amounts, of the Company’s financial instruments are included in the table below. Certain financial instruments and all non-financial instruments are excluded from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein may not necessarily represent the underlying fair value of the Company. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Amount Value Level 1 Level 2 Level 3 Financial Assets ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 223,512 ​ $ 223,512 ​ $ 223,512 ​ $ — ​ $ — Securities available for sale ​ 626,403 ​ 626,403 ​ — ​ 626,403 ​ — FHLB stock ​ 14,826 ​ 14,826 ​ — ​ 14,826 ​ — Loans held for sale ​ ​ 10,148 ​ ​ 10,148 ​ ​ — ​ ​ — ​ ​ 10,148 Net loans ​ 2,527,411 ​ 2,518,606 ​ — ​ — ​ 2,518,606 Accrued interest receivable ​ 3,688 ​ 3,668 ​ — ​ 3,668 ​ — Cash surrender value of bank-owned life insurance policies ​ 78,388 ​ 78,388 ​ — ​ 78,388 ​ — Derivative assets ​ 15,472 ​ 15,472 ​ — ​ 15,426 ​ 46 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial Liabilities ​ ​ ​ ​ ​ Non-maturity deposits ​ $ 2,273,906 ​ $ 2,274,973 ​ $ — ​ $ 2,274,973 ​ $ — Time deposits ​ ​ 638,436 ​ ​ 636,670 ​ ​ — ​ ​ 636,670 ​ ​ — Securities sold under agreements to repurchase ​ ​ 24,276 ​ ​ 24,276 ​ ​ — ​ ​ 24,276 ​ ​ — FHLB advances ​ 267,934 ​ 271,622 ​ — ​ 271,622 ​ — Subordinated borrowings ​ 60,003 ​ 57,133 ​ — ​ 57,133 ​ — Derivative liabilities ​ 16,890 ​ 16,890 ​ — ​ 16,805 ​ 85 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Amount Value Level 1 Level 2 Level 3 Financial Assets ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 226,007 ​ $ 226,007 ​ $ 226,007 ​ $ — ​ $ — Securities available for sale ​ 585,046 ​ 585,046 ​ — ​ 585,046 ​ — FHLB stock ​ 14,036 ​ 14,036 ​ — ​ 14,036 ​ — Loans held for sale ​ ​ 23,988 ​ ​ 24,163 ​ ​ — ​ ​ — ​ ​ 24,163 Net loans ​ 2,543,803 ​ 2,547,970 ​ — ​ — ​ 2,547,970 Accrued interest receivable ​ 2,964 ​ 2,964 ​ — ​ 2,964 ​ — Cash surrender value of bank-owned life insurance policies ​ 77,870 ​ 77,870 ​ — ​ 77,870 ​ — Derivative assets ​ 28,706 ​ 28,706 ​ — ​ 28,684 ​ 22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial Liabilities ​ ​ ​ ​ ​ Non-maturity deposits ​ $ 2,207,854 ​ $ 2,122,222 ​ $ — ​ $ 2,122,222 ​ $ — Time deposits ​ ​ 698,361 ​ ​ 694,700 ​ ​ — ​ ​ 694,700 ​ ​ — Short-term other borrowings ​ 27,779 ​ 27,779 ​ — ​ 27,779 ​ — FHLB advances ​ 248,283 ​ 252,698 ​ — ​ 252,698 ​ — Subordinated borrowings ​ 59,961 ​ 57,091 ​ — ​ 57,091 ​ — Derivative liabilities ​ 28,654 ​ 28,654 ​ — ​ 28,559 ​ 95 ​

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	​ ​ NOTE 10. REVENUE FROM CONTRACTS WITH CUSTOMER ​ The Company has accounted for the various non-interest revenue streams and related contracts under ASC 606. ​ Disaggregation of Revenue ​ The following tables present disaggregation of the Company’s non-interest revenue by major business line and timing of revenue recognition for the transfer of products or services: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, (in thousands) 2021 2020 Major Products/Service Lines ​ ​ Trust management fees ​ $ 3,175 ​ $ 3,046 Financial services fees ​ 491 ​ 323 Interchange fees ​ 1,712 ​ 1,738 Customer deposit fees ​ 1,049 ​ 1,110 Other customer service fees ​ 209 ​ 264 Total ​ $ 6,636 ​ $ 6,481 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, (in thousands) 2021 2020 Timing of Revenue Recognition ​ ​ Products and services transferred at a point in time ​ $ 3,287 ​ $ 3,273 Products and services transferred over time ​ 3,349 ​ 3,208 Total ​ $ 6,636 ​ $ 6,481 ​ Trust Management Fees ​ The trust management business generates revenue through a range of fiduciary services including trust and estate administration, wealth advisory, and investment management to individuals, businesses, not-for-profit organizations, and municipalities. Revenue from these services are generally recognized over time and is typically based on a time elapsed measure of service. Certain fees, such as bill paying fees, distribution fees, real estate sale fees, and supplemental tax service fees, are recorded as revenue at a point in time upon the completion of the service. ​ Financial Services Fees ​ Bar Harbor Financial Services is a branch office of Infinex, an independent registered broker dealer offering securities and insurance products not affiliated with the Company or its subsidiaries. The Company has a revenue sharing agreement with Infinex for any financial service fee income generated. Financial services fees are recognized at a point in time upon the completion of service requirements. ​ Interchange Fees ​ The Company earns interchange fees from transaction fees that merchants pay whenever a customer uses a debit card to make a purchase from their store. The fees are paid to the card-issuing bank to cover handling costs, fraud, bad debt costs and the risk involved in approving the payment. Interchange fees are generally recognized as revenue at a point in time upon the completion of a debit card transaction. ​ Customer Deposit Fees ​ The Customer Deposit business offers a variety of deposit accounts with a range of interest rates, fee schedules and other terms, which are designed to meet the customer's financial needs. Additional depositor-related services provided to customers include ATM, bank-by-phone, internet banking, internet bill pay, mobile banking, and other cash management services which include remote deposit capture, ACH origination, and wire transfers. These customer deposit fees are generally recognized by the Company at a point in time upon the completion of the service. ​ Other Customer Service Fees ​ The Company has certain incentive and referral fee arrangements with independent third parties in which fees are earned for new account activity, product sales, or transaction volume generated for the respective third parties. The Company also earns a percentage of the fees generated from third-party credit card plans promoted through the Bank. Revenue from these incentive and referral fee arrangements are recognized over time using the right to invoice measure of progress. ​ Contract Balances from Contracts with Customers ​ The following table provides information about contract assets or receivables and contract liabilities or deferred revenues from contracts with customers: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ March 31, 2021 ​ December 31, 2020 Balances from contracts with customers only: ​ ​ Other Assets ​ $ 1,293 ​ $ 1,121 Other Liabilities ​ 2,664 ​ 2,785 ​ The timing of revenue recognition, billings and cash collections results in contract assets or receivables and contract liabilities or deferred revenue on the consolidated balance sheets. For most customer contracts, fees are deducted directly from customer accounts and, therefore, there is no associated impact on the accounts receivable balance. For certain types of service contracts, the Company has an unconditional right to consideration under the service contract and an accounts receivable balance is recorded for services completed. When consideration is received, or such consideration is unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract, a contract liability is recorded. Contract liabilities are recognized as revenue after control of the products or services is transferred to the customer and all revenue recognition criteria have been met. ​ Costs to Obtain and Fulfill a Contract ​ The Company currently expenses contract costs for processing and administrative fees for debit card transactions. The Company also expenses custody fees and transactional costs associated with securities transactions as well as third party tax preparation fees. The Company has elected the practical expedient in ASC 340-40-25-4, whereby the Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets the Company otherwise would have recognized is one year or less.

LEASES

LEASES	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
LEASES	​ ​ NOTE 11. LEASES ​ A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. On January 1, 2019, the Company adopted ASU No. 2016-02 “Leases” ​ The Company elected the following practical expedients in conjunction with implementation of ASC 842 as follows: ● Package of practical expedients : o Lease classification as an operating lease under the prior standards is grandfathered. o Re-evaluation of embedded leases evaluated under the prior standards is not required. o No re-assessment of previously recorded initial direct lease costs. ● Election to exclude short-term leases (i.e., leases with initial terms of twelve months or less), from capitalization on the consolidated balance sheets. ​ The following table presents the consolidated statements of condition classification of the Company’s ROU assets and lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Classification March 31, 2021 December 31, 2020 Lease Right-of-Use Assets ​ ​ ​ ​ ​ Operating lease right-of-use assets Other assets ​ $ 10,056 ​ $ 10,338 ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease Liabilities ​ ​ Operating lease liabilities Other liabilities ​ 10,368 ​ 10,627 ​ The calculated amount of the ROU assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used for the present value of the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the ROU asset and lease liability. If there are multiple renewals typically only the next lease renewal is considered. Regarding the discount rate, ASC 842 requires the use of the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. ​ The following table presents the weighted average lease term and discount rate of the Company’s leases: ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 Weighted-average remaining lease term (in years) ​ ​ ​ ​ Operating leases ​ 9.02 ​ ​ 9.26 ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average discount rate ​ ​ ​ ​ Operating leases ​ 3.15 % ​ 3.15 % ​ The following table represents lease costs and other lease information. As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as real estate taxes, common area maintenance and utilities. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Three Months Ended (in thousands) March 31, 2021 March 31, 2020 Lease Costs ​ ​ Operating lease cost ​ $ 321 ​ $ 234 Variable lease cost ​ 81 ​ 144 Total lease cost ​ $ 402 ​ $ 378 ​ Future minimum payments for operating leases with initial or remaining terms of one year or more as of March 31, 2021 are, as follows: ​ ​ ​ ​ ​ (in thousands) Payments Twelve Months Ended: ​ March 31, 2022 ​ $ 1,300 March 31, 2023 ​ 1,319 March 31, 2024 ​ 1,323 March 31, 2025 ​ 1,240 March 31, 2026 ​ 1,085 Thereafter ​ 4,788 Total future minimum lease payments ​ 11,055 Amounts representing interest ​ (687) Present value of net future minimum lease payments ​ $ 10,368 ​

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	3 Months Ended
	Mar. 31, 2021
BASIS OF PRESENTATION
Consolidation	The consolidated financial statements (the “financial statements”) of Bar Harbor Bankshares and its subsidiaries (the “Company” or “Bar Harbor”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Bar Harbor Bankshares is a Maine Financial Institution Holding Company for the purposes of the laws of the state of Maine, and as such is subject to the jurisdiction of the Superintendent of the Maine Bureau of Financial Institutions. These financial statements include the accounts of the Company, its wholly owned subsidiary Bar Harbor Bank & Trust (the "Bank") and the Bank’s consolidated subsidiaries. The results of operations of companies or assets acquired are included only from the dates of acquisition. All material wholly owned and majority owned subsidiaries are consolidated unless GAAP requires otherwise. ​ In addition, these interim financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X, and accordingly, certain information and footnote disclosures normally included in financial statements prepared according to GAAP have been omitted. ​ The results for any interim period are not necessarily indicative of results for the full year. These consolidated financial statements should be read in conjunction with the audited financial statements and note disclosures for the Company's Annual Report on Form 10-K for the year ended December 31, 2020 previously filed with the Securities and Exchange Commission (the "SEC"). In management's opinion, all adjustments necessary for a fair statement are reflected in the interim periods presented.
Reclassifications	Reclassifications:
Allowance for Credit Loss on AFS Debt Securities	The disclosures below supplement updates the accounting policies previously disclosed in NOTE 1 – Summary of Significant Accounting Policies of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The updates reflect the adoption of the Financial Accounting Standards Board (FASB) Accounting Standards Updates (ASU) 2016-13, “Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments”, referred to as ASC 326 or, more commonly, referred to as Current Expected Credit Losses (CECL). Allowance for Credit Loss on AFS Debt Securities: A change in the allowance on AFS debt securities may be in full or a portion thereof, is recorded as expense (credit) within provision for credit losses on the consolidated statements of income. Losses are charged against the allowance when management believes the uncollectibility of an AFS debt security is confirmed based on the above described analysis. As of March 31, 2021 and January 1, 2021 (i.e. ASU 2016-13 adoption), there was no allowance carried on the Company's AFS debt securities. Refer to Note 2 of the consolidated financial statements for further discussion.
Loans	Loans: For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the contractual term of the loan using the level-yield method over the estimated lives of the related loans. When a loan is paid off, the unamortized portion of deferred fees or costs are recognized in interest income. Interest income on originated loans is accrued based upon the daily principal amount outstanding except for loans on non-accrual status. For acquired loans, interest income is accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan that was recognized based on the acquisition date fair value. When a loan is paid off, the unamortized portion of any premiums or discounts on loans are recognized in interest income.
Purchase Credit Deteriorated (PCD) Loans	Purchase Credit Deteriorated (PCD) Loans: ​ The Company adopted CECL using the prospective transition approach for financial assets purchased with credit deterioration that were previously classified as purchased credit impaired (PCI) and accounted for under ASC 310-30. In accordance with the standard, the Company did not reassess whether PCI assets met the definition of PCD assets as of the date of adoption. On January 1, 2021, the amortized cost basis of the PCD assets representing the noncredit discount will be accreted into interest income using the level-yield method over the estimated lives of the related loans. The converted PCD assets of $12.5 million were then pooled by call report coding and an additional allowance was calculated on the pooled assets separately from other loan pools totaling $524 thousand.
Non-performing loans	Non-performing loans: When a loan has been placed on non-accrual status, previously accrued and uncollected interest is reversed against interest on the loan. The interest on non-accrual loans is accounted for using the cash-basis or cost-recovery method depending on corresponding credit risk, until qualifying for return to accrual status. A loan can be returned to accrual status when collectability of principal is reasonably assured and the loan has performed for a period of time, generally six months. Previously, acquired loans that met the criteria for non-accrual of interest prior to the acquisition were considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company could reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans and any change in performance would have impacted accretable yield. After adoption of ASC 326 on January 1, 2021 the Company now treats these non-performing acquired loans that meet the criteria for non-accrual consistent with originated loans.
Allowance for Credit Losses	Allowance for Credit Losses: ​ Upon adoption of ASC 326 or CECL on January 1, 2021, the Company replaced the incurred loss impairment model that recognizes losses when it becomes probable that a credit loss will be incurred, with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the allowance when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged- off. The allowance is comprised of reserves measured on a collective (pool) basis based on a lifetime loss-rate model when similar risk characteristics exist. Loans that do not share risk characteristics are evaluated on an individual basis, generally larger non-accruing commercial loans and TDRs. ​ The Company uses the discounted cash flow (“DCF”) method to estimate expected credit losses for all loan portfolio segments measured on a collective (pool) basis. For each loan segment, the Company generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speeds, probability of default, and loss given default. The modeling of prepayment speeds is based on historical internal data. ​ The Company uses regression analysis of historical internal and peer data to determine suitable loss drivers to utilize when modeling lifetime probability of default. This analysis also determines how expected probability of default and loss given default will react to forecasted levels of the loss drivers. For all loan pools utilizing the DCF method, management utilizes various economic indicators such as changes in unemployment rates, gross domestic product, property values, housing starts, and other relevant factors as loss drivers. For all DCF models, management has determined that due to historic volatility in economic data, two quarters currently represents a reasonable and supportable forecast period, followed by a six-period reversion to historical mean levels for each of the various economic indicators. ​ The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Specific instrument effective yields are calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level Net Present Value ("NPV"). An allowance is established for the difference between the instrument’s NPV and amortized cost basis. ​ The allowance evaluation also considers various qualitative factors, such as: (i) changes to lending policies, underwriting standards and/or management personnel performing such functions, (ii) delinquency and other credit quality trends, (iii) credit risk concentrations, if any, (iv) changes to the nature of the Company's business impacting the loan portfolio, (v) and other external factors, that may include, but are not limited to, results of internal loan reviews, stress testing, examinations by bank regulatory agencies, or other events such as a natural disaster. ​ Arriving at an appropriate level of allowance involves a high degree of judgment. The determination of the adequacy of the allowance and provisioning for estimated losses is evaluated regularly based on review of loans, with particular emphasis on non-performing and other loans that management believes warrant special consideration. While management uses available information to recognize losses on loans, changing economic conditions and the economic prospects of the borrowers may necessitate future additions or reductions to the allowance.
Individually Evaluated Loans	Individually Evaluated Loans : ​ With the adoption of CECL, loans that do not share risk characteristics with existing pools are evaluated on an individual basis. For collateral dependent financial loans where the Company has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral. When repayment is expected to be from the operation of the collateral, the specific credit loss reserve is calculated as the amount by which the amortized cost basis of the financial asset exceeds the NPV from the operation of the collateral. When repayment is expected to be from the sale of the collateral, the specific credit loss reserve is calculated as the amount by which the amortized costs basis of the financial asset exceeds the fair value of the underlying collateral less estimated cost to sell. The allowance may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset.
Accrued Interest	Accrued Interest ​
Allowance for off-balance sheet credit exposures	Allowance for off-balance sheet credit exposures:
Impact Of Adoption	Impact of Adoption ​ The following table illustrates the adoption of CECL on January 1, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reclassification ​ Pre-CECL ​ Post-CECL ​ ​ ​ ​ ​ ​ ​ ​ to CECL ​ Adoption ​ Adoption ​ Impact of ​ ​ Pre-CECL ​ Portfolio ​ Portfolio ​ Portfolio ​ CECL (in thousands) Adoption Segmentation Segmentation Segmentation Adoption Assets: ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ Commercial construction ​ $ 131,123 ​ $ (13,241) ​ $ 117,882 ​ $ 117,882 ​ $ — Commercial real estate ​ 953,258 ​ (953,258) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 219,217 ​ 219,217 ​ 219,217 ​ — Commercial real estate non-owner occupied ​ — ​ 716,776 ​ 716,776 ​ 716,776 ​ — Tax exempt ​ 63,431 ​ (15,569) ​ 47,862 ​ 47,862 ​ — Commercial and industrial ​ 377,638 ​ (21,954) ​ 355,684 ​ 355,684 ​ — Residential real estate ​ 923,891 ​ 71,325 ​ 995,216 ​ 995,216 ​ — Home equity ​ 102,464 ​ (2,368) ​ 100,096 ​ 100,096 ​ — Consumer other ​ 11,080 ​ (928) ​ 10,152 ​ 10,152 ​ — Total loans ​ $ 2,562,885 ​ $ — ​ $ 2,562,885 ​ $ 2,562,885 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit losses on loans ​ ​ ​ ​ ​ Commercial construction ​ $ 1,044 ​ $ (220) ​ $ 824 ​ $ 2,020 ​ $ 1,196 Commercial real estate ​ 10,199 ​ (10,199) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 1,783 ​ 1,783 ​ 2,491 ​ 708 Commercial real estate non-owner occupied ​ — ​ 7,864 ​ 7,864 ​ 5,856 ​ (2,008) Tax exempt ​ 80 ​ (22) ​ 58 ​ 98 ​ 40 Commercial and industrial ​ 3,302 ​ (165) ​ 3,137 ​ 6,133 ​ 2,996 Residential real estate ​ 4,078 ​ 932 ​ 5,010 ​ 6,742 ​ 1,732 Home equity ​ 258 ​ 27 ​ 285 ​ 888 ​ 603 Consumer other ​ 121 ​ — ​ 121 ​ 82 ​ (39) Total allowance for credit losses on loans ​ $ 19,082 ​ $ — ​ $ 19,082 ​ $ 24,310 ​ $ 5,228 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ Allowance for credit losses on unfunded commitments ​ $ 359 ​ $ — ​ $ 359 ​ $ 1,975 ​ $ 1,616 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total allowance for credit losses ​ $ 19,441 ​ $ — ​ $ 19,441 ​ $ 26,285 ​ $ 6,844 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retained earnings: ​ ​ ​ ​ ​ Total increase in Allowance for credit losses ​ ​ ​ ​ ​ $ 6,844 Balance sheet reclassification ​ ​ ​ ​ ​ — Total pre-tax impact ​ ​ ​ ​ ​ 6,844 Tax effect ​ ​ ​ ​ ​ (1,602) Decrease to retained earnings ​ ​ ​ ​ ​ $ 5,242
Recent Accounting Pronouncements	Recent Accounting Pronouncements ​ The following table provides a brief description of recent accounting standards updates ("ASU") that could have a material impact to the Company’s consolidated financial statements upon adoption: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Standard Description Required Date Effect on financial statements Standards Adopted in 2021 ​ ​ ​ ASU 2016-13, Measurement of Credit Losses on Financial Instruments ASU 2018‑19, Codification Improvements to ASU 2016-13 ​ ​ This ASU amends Topic 326, Financial Instruments- Credit Losses to replace the current incurred loss accounting model with a current expected credit loss approach ("CECL") for financial instruments measured at amortized cost and other commitments to extend credit, such as of balance sheet credit exposures (loan comitments, unused line of credit and stand-by letters of credit). The amendments require entities to consider all available relevant information when estimating current expected credit losses, including details about past events, current conditions, and reasonable and supportable forecasts. The resulting allowance for credit losses is to reflect the portion of the amortized cost basis that the entity does not expect to collect. The amendments also eliminate the current accounting model for purchased credit impaired loans and certain off-balance sheet exposures. Additional quantitative and qualitative disclosures are required upon adoption. ​ ​ January 1, 2022 ​ ​ ​ Adoption of this ASU is expected to primarily change how the Company estimates credit losses with the application of the expected credit loss model. The Company will apply the standard's provisions as a cumulative effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company's CECL implementation efforts in the first quarter focused on the finalization and board approval of the final CECL model, completed modelling of off-balance sheet credit risks, completed formal governance and control documentation, and developed and presented revised disclosures for board approval. million. Equity was reduced by million in the first quarter due to adoption. The coverage ratio of ACL to total loans increased to ​ Standard Description Required Date Effect on financial statements Standards Adopted in 2021 ​ ​ ​ ASU 2018-14 Compensation- Disclosure Requirements for Defined Pension Plans Topic 715-20 ​ ​ This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other post-retirement benefit plans. ​ ​ January 1, 2021 ​ ​ Adoption of this ASU did not have a material impact on the Company's consolidated financial statements. The impact will be reflected in the Company’s annual 10-K disclosures of employee benefit plans. ASU 2020-01, Investments—Equity Securities, Investments Equity Method and Joint Ventures, and Derivatives and Hedging ​ ​ In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which added Topic 321, Investments – Equity Securities, and made targeted improvements to address certain aspects of accounting for financial instruments. The amendments in this Update affect all entities that apply the guidance in Topics 321, 323, and 815 and (1) elect to apply the measurement alternative or (2) enter into a forward contract or purchase an option to purchase securities that, upon settlement of the forward contract or exercise of the purchased option, would be accounted for under the equity method of accounting. ​ ​ December 15, 2020 ​ ​ The adoption had no material impact on the Company's consolidated financial statements. The Company’s equity method investments which primarily consist of community limited partnership investments are in compliance with the new guidance prospectively in 2021. ASU 2020-04 Facilitation of the Effects of Reference Rate Reform, Topic 848, as amended in ASU 2021-01 ​ ​ This ASU provides temporary optional expedients and exceptions to GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rate ("SOFR"). For instance, companies can (1) elect not to apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. A company that makes this election would not have to re-measure the contracts at the modification date or reassess a previous accounting determination. Companies can also (2) elect various optional expedients that would allow them to continue applying hedge accounting for hedging relationships affected by reference rate reform, if certain criteria are met. Finally, companies can (3) make a one-time election to sell and/or reclassify held-to-maturity debt securities that ​ ​ May be elected through December 31, 2022. ​ ​ The Company is currently evaluating all of its contracts, hedging relationships and other transactions that will be effected by reference rates that are being discontinued and determining which elections need to be made. The Company is currently evaluating all of its contracts, hedging relationships and other transactions that will be effected by reference rates that are being discontinued and determining which elections need to be made reference an interest rate affected by reference rate reform. ​ ​ Rate Reform Elections at March 31, 2021 ​ Adherence to ISDA Fallback Protocol The ISDA 2020 IBOR Fallbacks Protocol (the “ISDA Fallback Protocol”) was made available for adherence on October 23, 2020 with an effective date of January 25, 2021. Once adhered to by both counterparties in a bilateral relationship and the effective date is reached, the ISDA Fallback Protocol represents a change to the contractual terms of derivatives governed by each respective ISDA agreement between the Company and a derivative counterparty. The change relates to reference rate reform and represents the potential for addition of or changes to contractual terms and was developed by a private-sector working group convened by a regulator as referenced in 848-20-15-5(g). For all of the Company’s interest rate swaps that meet the scope requirements of 848-10-15-3 and 848-10-15-3A and for which the Company adhered to the ISDA Fallback Protocol, the Company makes the following elections: • Modification related elections • Option to not reassess a previous accounting determination (paragraph 848-20-35-4). • Hedge accounting related modifications • Option to not dedesignate a hedging relationship due to a change in a critical term (paragraph 848-30-25-3). • Option to change the contractual terms of a hedging instrument, hedged item, or forecasted transaction and to not dedesignate a hedging relationship (paragraph 848-30-25-5). ​ Cash flow hedges The Company hereby amends the hedge documentation, without dedesignating and redesignating, for all outstanding cash flow hedging relationships for the following elections: ​ • Probability of forecasted transactions: The Company elects the expedient in ASC 848-50-25-2 to assert probability of the hedged interest payments/receipts regardless of any expected modification in terms related to reference rate reform. • Assessment of effectiveness: In accordance with ASC 848-30-25-4, ASC 848-30-25-8, and ASC 848-50-35-1 through 35-24 the Company has the option to change the method of assessing effectiveness upon a change in the critical terms of the derivative or the hedged transactions and upon the end of relief under ASC 848. At this time the Company elects to continue the method of assessing effectiveness as documented in the original hedge documentation and elects to apply the expedient in ASC 848-50-35-17 so that the reference rate on the hypothetical derivative matches the reference rate on the hedging instrument. For new hedging relationships designated subsequent to the date of this memorandum, the Company elects to apply the expedient in ASC 848-50-25-11 to assume that the reference rate will not be replaced for the remainder of the hedging relationship. ​ New hedging activity The Company makes the same elections for each hedging relationship designated subsequent to March 31, 2021. Any hedging relationship-specific elections beyond the elections noted above will be documented in the respective inception hedge documentation. Subsequent election of optional expedients and exceptions after the March 31, 2021 will be documented in accordance with the elections being made here.

BASIS OF PRESENTATION (Tables)

BASIS OF PRESENTATION (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Schedule of impact of CECL adoption	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reclassification ​ Pre-CECL ​ Post-CECL ​ ​ ​ ​ ​ ​ ​ ​ to CECL ​ Adoption ​ Adoption ​ Impact of ​ ​ Pre-CECL ​ Portfolio ​ Portfolio ​ Portfolio ​ CECL (in thousands) Adoption Segmentation Segmentation Segmentation Adoption Assets: ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ Commercial construction ​ $ 131,123 ​ $ (13,241) ​ $ 117,882 ​ $ 117,882 ​ $ — Commercial real estate ​ 953,258 ​ (953,258) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 219,217 ​ 219,217 ​ 219,217 ​ — Commercial real estate non-owner occupied ​ — ​ 716,776 ​ 716,776 ​ 716,776 ​ — Tax exempt ​ 63,431 ​ (15,569) ​ 47,862 ​ 47,862 ​ — Commercial and industrial ​ 377,638 ​ (21,954) ​ 355,684 ​ 355,684 ​ — Residential real estate ​ 923,891 ​ 71,325 ​ 995,216 ​ 995,216 ​ — Home equity ​ 102,464 ​ (2,368) ​ 100,096 ​ 100,096 ​ — Consumer other ​ 11,080 ​ (928) ​ 10,152 ​ 10,152 ​ — Total loans ​ $ 2,562,885 ​ $ — ​ $ 2,562,885 ​ $ 2,562,885 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit losses on loans ​ ​ ​ ​ ​ Commercial construction ​ $ 1,044 ​ $ (220) ​ $ 824 ​ $ 2,020 ​ $ 1,196 Commercial real estate ​ 10,199 ​ (10,199) ​ — ​ — ​ — Commercial real estate owner occupied ​ — ​ 1,783 ​ 1,783 ​ 2,491 ​ 708 Commercial real estate non-owner occupied ​ — ​ 7,864 ​ 7,864 ​ 5,856 ​ (2,008) Tax exempt ​ 80 ​ (22) ​ 58 ​ 98 ​ 40 Commercial and industrial ​ 3,302 ​ (165) ​ 3,137 ​ 6,133 ​ 2,996 Residential real estate ​ 4,078 ​ 932 ​ 5,010 ​ 6,742 ​ 1,732 Home equity ​ 258 ​ 27 ​ 285 ​ 888 ​ 603 Consumer other ​ 121 ​ — ​ 121 ​ 82 ​ (39) Total allowance for credit losses on loans ​ $ 19,082 ​ $ — ​ $ 19,082 ​ $ 24,310 ​ $ 5,228 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ Allowance for credit losses on unfunded commitments ​ $ 359 ​ $ — ​ $ 359 ​ $ 1,975 ​ $ 1,616 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total allowance for credit losses ​ $ 19,441 ​ $ — ​ $ 19,441 ​ $ 26,285 ​ $ 6,844 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retained earnings: ​ ​ ​ ​ ​ Total increase in Allowance for credit losses ​ ​ ​ ​ ​ $ 6,844 Balance sheet reclassification ​ ​ ​ ​ ​ — Total pre-tax impact ​ ​ ​ ​ ​ 6,844 Tax effect ​ ​ ​ ​ ​ (1,602) Decrease to retained earnings ​ ​ ​ ​ ​ $ 5,242

SECURITIES AVAILABLE FOR SALE (

SECURITIES AVAILABLE FOR SALE (Tables)	3 Months Ended
	Mar. 31, 2021
SECURITIES AVAILABLE FOR SALE
Summary of Securities Available for Sale	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ Unrealized ​ Unrealized ​ ​ ​ (in thousands) Amortized Cost Gains Losses Fair Value March 31, 2021 ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 213,049 ​ $ 4,860 ​ $ (3,302) ​ $ 214,607 US Government agency ​ 74,293 ​ 2,211 ​ (319) ​ 76,185 Private label ​ 47,576 ​ 111 ​ (146) ​ 47,541 Obligations of states and political subdivisions thereof ​ 185,985 ​ 3,081 ​ (1,203) ​ 187,863 Corporate bonds ​ 99,616 ​ 1,560 ​ (969) ​ 100,207 Total securities available for sale ​ $ 620,519 ​ $ 11,823 ​ $ (5,939) ​ $ 626,403 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ ​ ​ Unrealized ​ Unrealized ​ ​ ​ (in thousands) Amortized Cost Gains Losses Fair Value December 31, 2020 ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 206,834 ​ $ 6,018 ​ $ (462) ​ $ 212,390 US Government agency ​ 82,878 ​ 2,870 ​ (116) ​ 85,632 Private label ​ 19,810 ​ 40 ​ (141) ​ 19,709 Obligations of states and political subdivisions thereof ​ 164,766 ​ 4,244 ​ (6) ​ 169,004 Corporate bonds ​ 97,689 ​ 1,465 ​ (843) ​ 98,311 Total securities available for sale ​ $ 571,977 ​ $ 14,637 ​ $ (1,568) ​ $ 585,046
Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) Securities, Segregated by Contractual Maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale (in thousands) Amortized Cost Fair Value Within 1 year $ 4,776 ​ $ 4,848 Over 1 year to 5 years ​ 20,745 ​ 20,965 Over 5 years to 10 years ​ 75,062 ​ 73,650 Over 10 years ​ 185,018 ​ 188,607 Total bonds and obligations ​ 285,601 ​ 288,070 Mortgage-backed securities ​ 334,918 ​ 338,333 Total securities available for sale ​ $ 620,519 ​ $ 626,403
Schedule of Gains and Losses from Sale of AFS Securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, (in thousands) 2021 2020 Gross gains on sales of available for sale securities ​ $ — ​ $ 146 Gross losses on sales of available for sale securities ​ — ​ (11) Net gains on sale of available for sale securities ​ $ — ​ $ 135
Schedule of Securities with Unrealized Losses, Segregated by the Duration of Continuous Unrealized Loss Positions	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Over Twelve Months ​ Total ​ ​ Gross ​ ​ Gross ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair (in thousands) Losses Value Losses Value Losses Value March 31, 2021 ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 3,073 ​ $ 96,384 ​ $ 229 ​ $ 3,803 ​ $ 3,302 ​ $ 100,187 US Government agency ​ 300 ​ 14,716 ​ 19 ​ 4,204 ​ 319 ​ 18,920 Private label ​ 2 ​ 15,822 ​ 144 ​ 19,257 ​ 146 ​ 35,079 Obligations of states and political subdivisions thereof ​ 1,203 ​ 56,813 ​ — ​ — ​ 1,203 ​ 56,813 Corporate bonds ​ 128 ​ 14,622 ​ 841 ​ 19,158 ​ 969 ​ 33,780 Total securities available for sale ​ $ 4,706 ​ $ 198,357 ​ $ 1,233 ​ $ 46,422 ​ $ 5,939 ​ $ 244,779 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Over Twelve Months ​ Total ​ Gross ​ ​ Gross ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair (in thousands) ​ Losses ​ Value ​ Losses ​ Value ​ Losses ​ Value December 31, 2020 ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ US Government-sponsored enterprises ​ $ 209 ​ $ 40,285 ​ $ 253 ​ $ 4,323 ​ $ 462 ​ $ 44,608 US Government agency ​ 45 ​ 6,776 ​ 71 ​ 3,297 ​ 116 ​ 10,073 Private label ​ — ​ — ​ 141 ​ 19,514 ​ 141 ​ 19,514 Obligations of states and political subdivisions thereof ​ 6 ​ 5,577 ​ — ​ — ​ 6 ​ 5,577 Corporate bonds ​ 555 ​ 21,774 ​ 288 ​ 11,712 ​ 843 ​ 33,486 Total securities available for sale ​ $ 815 ​ $ 74,412 ​ $ 753 ​ $ 38,846 ​ $ 1,568 ​ $ 113,258

LOANS AND ALLOWANCE FOR CREDI_2

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, (in thousands) 2021 2020 Commercial construction ​ $ 117,464 ​ $ 117,882 Commercial real estate owner occupied ​ 233,847 ​ 219,217 Commercial real estate non-owner occupied ​ 733,507 ​ 716,776 Tax exempt ​ 46,541 ​ 47,862 Commercial and industrial ​ 376,395 ​ 355,684 Residential real estate ​ 940,127 ​ 995,216 Home equity ​ 93,625 ​ 100,096 Consumer other ​ 9,558 ​ 10,152 Total loans ​ 2,551,064 ​ 2,562,885 Allowance for credit losses ​ 23,653 ​ 19,082 Net loans ​ $ 2,527,411 ​ $ 2,543,803
Summary of Unamortized Net Costs and Premiums in Business Activity Loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, (in thousands) 2021 2020 Unamortized net loan origination costs ​ $ 3,774 ​ $ 5,157 Unamortized net premium on purchased loans ​ (82) ​ (85) Total unamortized net costs and premiums ​ $ 3,692 ​ $ 5,072
Schedule of Activity in the Allowance for Loan Losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021 ​ ​ Balance at ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning of ​ Impact of ASC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at (in thousands) Period 326 Charge Offs Recoveries Provision End of Period Commercial construction ​ $ 824 ​ $ 1,196 ​ $ — ​ $ 18 ​ $ (246) ​ $ 1,792 Commercial real estate owner occupied ​ 1,783 ​ 708 ​ (153) ​ 0 ​ 1,014 ​ 3,352 Commercial real estate non-owner occupied ​ 7,864 ​ (2,008) ​ — ​ 4 ​ 42 ​ 5,902 Tax exempt ​ 58 ​ 40 ​ — ​ — ​ (4) ​ 94 Commercial and industrial ​ 3,137 ​ 2,996 ​ — ​ 1 ​ (1,094) ​ 5,040 Residential real estate ​ 5,010 ​ 1,732 ​ (40) ​ 13 ​ (146) ​ 6,569 Home equity ​ 285 ​ 603 ​ (22) ​ 11 ​ (54) ​ 823 Consumer other ​ 121 ​ (39) ​ (1) ​ 1 ​ (1) ​ 81 Total ​ $ 19,082 ​ $ 5,228 ​ $ (216) ​ $ 48 ​ $ (489) ​ $ 23,653 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ Balance at ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning of ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at (in thousands) Period Charge Offs Recoveries Provision End of Period Commercial construction ​ $ 317 ​ $ — ​ $ — ​ $ 78 ​ $ 395 Commercial real estate owner occupied ​ 2,368 ​ — ​ — ​ (882) ​ 1,486 Commercial real estate non-owner occupied ​ 4,695 ​ (871) ​ 25 ​ 1,465 ​ 5,314 Tax exempt ​ 67 ​ — ​ — ​ (10) ​ 57 Commercial and industrial ​ 3,262 ​ (179) ​ 9 ​ 231 ​ 3,323 Residential real estate ​ 4,213 ​ (8) ​ 7 ​ 79 ​ 4,291 Home equity ​ 320 ​ — ​ — ​ 8 ​ 328 Consumer other ​ 111 ​ (153) ​ 3 ​ 142 ​ 103 Total ​ $ 15,353 ​ $ (1,211) ​ $ 44 ​ $ 1,111 ​ $ 15,297 ​
Schedule of Loans by Risk Rating	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ 2021 ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ Prior ​ Total Commercial construction ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 1,262 ​ $ 61,092 ​ $ 29,027 ​ $ 26,083 ​ $ — ​ $ — ​ $ 117,464 Special mention ​ — ​ — ​ — ​ — ​ — ​ — ​ — Substandard ​ — ​ — ​ — ​ — ​ — ​ — ​ — Total ​ $ 1,262 ​ $ 61,092 ​ $ 29,027 ​ $ 26,083 ​ $ — ​ $ — ​ $ 117,464 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate owner occupied ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 915 ​ $ 14,931 ​ $ 34,446 ​ $ 30,661 ​ $ 21,587 ​ $ 118,206 ​ $ 220,746 Special mention ​ — ​ — ​ 780 ​ — ​ — ​ 1,102 ​ 1,882 Substandard ​ — ​ — ​ — ​ 262 ​ 262 ​ 10,319 ​ 10,843 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ 188 ​ ​ ​ ​ ​ 188 ​ ​ 376 Total ​ $ 915 ​ $ 14,931 ​ $ 35,226 ​ $ 31,111 ​ $ 21,849 ​ $ 129,815 ​ $ 233,847 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate non-owner occupied ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 36,535 ​ $ 153,240 ​ $ 121,209 ​ $ 42,460 ​ $ 155,787 ​ $ 218,391 ​ $ 727,622 Special mention ​ — ​ — ​ — ​ 118 ​ — ​ 1,779 ​ 1,897 Substandard ​ — ​ — ​ — ​ 168 ​ 168 ​ 3,463 ​ 3,799 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 189 ​ ​ 189 Total ​ $ 36,535 ​ $ 153,240 ​ $ 121,209 ​ $ 42,746 ​ $ 155,955 ​ $ 223,822 ​ $ 733,507 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tax exempt ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 678 ​ $ 1,845 ​ $ 1,131 ​ $ 14,840 ​ $ 5,470 ​ $ 22,577 ​ $ 46,541 Special mention ​ — ​ — ​ — ​ — ​ — ​ — ​ — Substandard ​ — ​ — ​ — ​ — ​ — ​ — ​ — Total ​ $ 678 ​ $ 1,845 ​ $ 1,131 ​ $ 14,840 ​ $ 5,470 ​ $ 22,577 ​ $ 46,541 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ Risk rating: ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 59,576 ​ $ 87,130 ​ $ 41,814 ​ $ 19,119 ​ $ 64,289 ​ $ 80,963 ​ $ 352,891 Special mention ​ 196 ​ 351 ​ 844 ​ 744 ​ 2,683 ​ 1,150 ​ 5,969 Substandard ​ — ​ — ​ 611 ​ 15,220 ​ 88 ​ 1,039 ​ 16,958 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 131 ​ ​ 445 ​ ​ 576 Total ​ $ 59,772 ​ $ 87,481 ​ $ 43,269 ​ $ 35,083 ​ $ 67,192 ​ $ 83,598 ​ $ 376,395 (continued) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ 2021 ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ Prior ​ Total Residential real estate ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 36,563 ​ $ 132,520 ​ $ 114,920 ​ $ 86,017 ​ $ 85,719 ​ $ 475,246 ​ $ 930,985 Nonperforming ​ — ​ — ​ — ​ 299 ​ 274 ​ 8,569 ​ 9,142 Total ​ $ 36,563 ​ $ 132,520 ​ $ 114,920 ​ $ 86,316 ​ $ 85,993 ​ $ 483,815 ​ $ 940,127 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Home equity ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 2,137 ​ $ 11,009 ​ $ 11,783 ​ $ 8,800 ​ $ 8,118 ​ $ 50,434 ​ $ 92,281 Nonperforming ​ — ​ — ​ — ​ — ​ 65 ​ 1,279 ​ 1,344 Total ​ $ 2,137 ​ $ 11,009 ​ $ 11,783 ​ $ 8,800 ​ $ 8,183 ​ $ 51,713 ​ $ 93,625 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer other ​ ​ ​ ​ ​ ​ ​ Performing ​ $ 1,030 ​ $ 2,928 ​ $ 1,552 ​ $ 1,013 ​ $ 420 ​ $ 2,605 ​ $ 9,548 Nonperforming ​ — ​ — ​ — ​ — ​ — ​ 10 ​ 10 Total ​ $ 1,030 ​ $ 2,928 ​ $ 1,552 ​ $ 1,013 ​ $ 420 ​ $ 2,615 ​ $ 9,558 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Loans ​ $ 138,893 ​ $ 465,046 ​ $ 358,117 ​ $ 245,992 ​ $ 345,062 ​ $ 997,954 ​ $ 2,551,064 ​ The following table summarizes credit risk exposure indicators by portfolio segment, under the incurred loss methodology, as of the period indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Commercial ​ Commercial ​ Residential ​ ​ ​ ​ ​ ​ Real Estate ​ and Industrial ​ Real Estate ​ Consumer ​ Total Grade: ​ ​ ​ ​ ​ ​ Pass $ 1,053,773 ​ $ 422,016 ​ $ — ​ $ — ​ $ 1,475,789 Performing ​ ​ — ​ ​ — ​ ​ 914,749 ​ ​ 112,190 ​ ​ 1,026,939 Special mention ​ 6,075 ​ ​ 2,771 ​ ​ — ​ ​ — ​ ​ 8,846 Substandard ​ 22,267 ​ ​ 15,180 ​ ​ — ​ ​ — ​ ​ 37,447 Doubtful ​ 2,265 ​ ​ 1,100 ​ ​ — ​ ​ — ​ ​ 3,365 Loss ​ 1 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ 3 Non-performing ​ ​ — ​ ​ — ​ ​ 9,142 ​ ​ 1,354 ​ ​ 10,496 Total $ 1,084,381 ​ $ 441,069 ​ $ 923,891 ​ $ 113,544 ​ $ 2,562,885
Summary of Past Due Loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 (in thousands) 30-59 60-89 90+ Total Past Due Current Total Loans Commercial construction ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 117,464 ​ $ 117,464 Commercial real estate owner occupied ​ 10 ​ — ​ 331 ​ 341 ​ 233,506 ​ 233,847 Commercial real estate non-owner occupied ​ 644 ​ 179 ​ 317 ​ 1,140 ​ 732,367 ​ 733,507 Tax exempt ​ — ​ — ​ — ​ — ​ 46,541 ​ 46,541 Commercial and industrial ​ 364 ​ — ​ 399 ​ 763 ​ 375,632 ​ 376,395 Residential real estate ​ 7,815 ​ 1,345 ​ 3,194 ​ 12,354 ​ 927,773 ​ 940,127 Home equity ​ 399 ​ 198 ​ 429 ​ 1,026 ​ 92,599 ​ 93,625 Consumer other ​ 4 ​ — ​ 100 ​ 104 ​ 9,454 ​ 9,558 Total ​ $ 9,236 ​ $ 1,722 ​ $ 4,770 ​ $ 15,728 ​ $ 2,535,336 ​ $ 2,551,064 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 (in thousands) 30-59 60-89 90+ Total Past Due Current Total Loans Commercial construction ​ $ 74 ​ $ — ​ $ 1 ​ $ 75 ​ $ 117,807 ​ $ 117,882 Commercial real estate owner occupied ​ 1,309 ​ 464 ​ 438 ​ 2,211 ​ 217,006 ​ 219,217 Commercial real estate non-owner occupied ​ 503 ​ 674 ​ 624 ​ 1,801 ​ 714,975 ​ 716,776 Tax exempt ​ — ​ — ​ — ​ — ​ 47,862 ​ 47,862 Commercial and industrial ​ 161 ​ — ​ 193 ​ 354 ​ 355,330 ​ 355,684 Residential real estate ​ 9,178 ​ 2,511 ​ 3,200 ​ 14,889 ​ 980,327 ​ 995,216 Home equity ​ 1,062 ​ 614 ​ 375 ​ 2,051 ​ 98,045 ​ 100,096 Consumer other ​ 20 ​ — ​ 2 ​ 22 ​ 10,130 ​ 10,152 Total ​ $ 12,307 ​ $ 4,263 ​ $ 4,833 ​ $ 21,403 ​ $ 2,541,482 ​ $ 2,562,885
Summary of Information Pertaining to Non-Accrual Loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ ​ Nonaccrual With No ​ 90+ Days Past (in thousands) Nonaccrual Related Allowance Due and Accruing Commercial construction ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied ​ 1,576 ​ 895 ​ — Commercial real estate non-owner occupied ​ 930 ​ 742 ​ 50 Tax exempt ​ — ​ — ​ — Commercial and industrial ​ 1,067 ​ 641 ​ 15 Residential real estate ​ 9,142 ​ 3,405 ​ 24 Home equity ​ 1,344 ​ 352 ​ — Consumer other ​ 10 ​ — ​ 100 Total ​ $ 14,069 ​ $ 6,035 ​ $ 189 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Nonaccrual With No ​ 90+ Days Past (in thousands) Nonaccrual Related Allowance Due and Accruing Commercial construction ​ $ 258 ​ $ — ​ $ — Commercial real estate owner occupied ​ 2,400 ​ 929 ​ — Commercial real estate non-owner occupied ​ 383 ​ 118 ​ — Tax exempt ​ — ​ — ​ — Commercial and industrial ​ 1,223 ​ 1,065 ​ — Residential real estate ​ 5,883 ​ 4,948 ​ — Home equity ​ 1,345 ​ 1,346 ​ 267 Consumer other ​ 58 ​ 58 ​ — Total ​ $ 11,550 ​ $ 8,464 ​ $ 267
Schedule of amortized cost basis of collateral-dependent loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 (in thousands) Real Estate Other Real Estate Other Commercial construction ​ $ — ​ $ — ​ $ 259 ​ $ — Commercial real estate owner occupied ​ 1,576 ​ — ​ 3,441 ​ — Commercial real estate non-owner occupied ​ 930 ​ — ​ 383 ​ — Tax exempt ​ — ​ — ​ — ​ — Commercial and industrial ​ 564 ​ 503 ​ 625 ​ 607 Residential real estate ​ 9,142 ​ — ​ 7,432 ​ — Home equity ​ 1,344 ​ — ​ 1,493 ​ — Consumer other ​ 10 ​ — ​ 60 ​ — Total ​ $ 13,566 ​ $ 503 ​ $ 13,693 ​ $ 607
Summary of Impaired Loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Recorded Unpaid Principal Related Average Recorded Interest (in thousands) ​ Investment ​ Balance ​ Allowance ​ Investment ​ Income Recognized With no related allowance: ​ ​ ​ ​ ​ Construction and land development ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Other commercial real estate ​ 2,001 ​ 2,047 ​ — ​ 1,610 ​ — Commercial ​ 1,095 ​ 1,254 ​ — ​ 1,140 ​ 4 Agricultural ​ 361 ​ 150 ​ — ​ 114 ​ 2 Tax exempt loans ​ — ​ — ​ — ​ — ​ — Residential real estate ​ 2,745 ​ 3,165 ​ — ​ 1,077 ​ 17 Home equity ​ — ​ — ​ — ​ — ​ — Other consumer ​ — ​ — ​ — ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ With an allowance recorded: ​ ​ ​ ​ ​ Construction and land development ​ 258 ​ 258 ​ 205 ​ 203 ​ — Other commercial real estate ​ 1,963 ​ 2,108 ​ 1,038 ​ 1,973 ​ 17 Commercial ​ 282 ​ 289 ​ 164 ​ 73 ​ — Agricultural ​ — ​ — ​ — ​ — ​ — Tax exempt loans ​ — ​ — ​ — ​ — ​ — Residential real estate ​ 887 ​ 944 ​ 106 ​ 1,865 ​ 37 Home equity ​ 13 ​ 13 ​ — ​ 12 ​ 1 Other consumer ​ — ​ — ​ — ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ ​ ​ ​ ​ Commercial real estate ​ 4,222 ​ 4,413 ​ 1,243 ​ 3,786 ​ 17 Commercial and industrial ​ 1,738 ​ 1,693 ​ 164 ​ 1,327 ​ 6 Residential real estate ​ 3,632 ​ 4,109 ​ 106 ​ 2,942 ​ 54 Consumer ​ 13 ​ 13 ​ — ​ 12 ​ 1 Total impaired loans ​ $ 9,605 ​ $ 10,228 ​ $ 1,513 ​ $ 8,067 ​ $ 78
Schedule of Recorded Investment and Number of Modifications for TDRs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ Pre-Modification ​ Post-Modification ​ ​ ​ ​ ​ Number of ​ Outstanding ​ Outstanding ​ ​ ​ (in thousands) Modifications Balance Balance Reserve Commercial construction ​ — ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied — ​ — ​ — ​ — Commercial real estate non-owner occupied — ​ — ​ — ​ — Tax exempt — ​ — ​ — ​ — Commercial and industrial — ​ — ​ — ​ — Residential real estate — ​ — ​ — ​ — Home equity — ​ — ​ — ​ — Consumer other — ​ — ​ — ​ — Total — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ Pre-Modification ​ Post-Modification ​ ​ ​ ​ ​ Number of ​ Outstanding ​ Outstanding ​ ​ ​ (in thousands) Modifications Balance Balance Reserve Commercial construction ​ — ​ $ — ​ $ — ​ $ — Commercial real estate owner occupied — ​ — ​ — ​ — Commercial real estate non-owner occupied 1 ​ 54 ​ 259 ​ — Tax exempt — ​ — ​ — ​ — Commercial and industrial 3 ​ 41 ​ 208 ​ — Residential real estate — ​ — ​ — ​ — Home equity 1 ​ 26 ​ 25 ​ — Consumer other 1 ​ 9 ​ 9 ​ — Total 6 ​ $ 130 ​ $ 501 ​ $ — ​
Summary of Loan Concessions	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ March 31, 2020 ​ ​ Post-Modification ​ Post-Modification ​ ​ Number of ​ Outstanding ​ Number of ​ Outstanding (in thousands) ​ Modifications ​ Balance ​ Modifications ​ Balance Interest rate, forbearance and maturity concession — ​ $ — 4 ​ $ 467 Forbearance and interest only payments — ​ — 1 ​ 25 Maturity concession — ​ — 1 ​ 9 Total — ​ $ — 6 ​ $ 501
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Activity in the Allowance for Loan Losses	​ ​ ​ ​ ​ (in thousands) 2021 Balance at December 31, 2020 ​ $ 359 Impact of CECL adoption ​ ​ 1,616 Provision for credit losses ​ (156) Balance at March 31, 2021 ​ $ 1,819 ​ ​ ​ ​ ​ (in thousands) 2020 Balance at December 31, 2019 ​ $ 314 Provision for credit losses ​ 45 Balance at December 31, 2020 ​ $ 359

BORROWED FUNDS (Tables)

BORROWED FUNDS (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Borrowed Funds	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ (dollars in thousands) Carrying Value Average Rate ​ Carrying Value Average Rate Short-term borrowings ​ ​ ​ ​ ​ ​ ​ Advances from the FHLB ​ $ 85,329 0.51 % ​ $ 65,676 1.19 % Other borrowings ​ 24,276 0.16 ​ ​ 27,779 0.15 ​ Total short-term borrowings ​ 109,605 0.26 ​ ​ 93,455 0.44 ​ Long-term borrowings ​ ​ ​ ​ Advances from the FHLB ​ 182,605 1.73 ​ ​ 182,607 1.73 ​ Subordinated borrowings ​ 60,003 4.45 ​ ​ 59,961 4.34 ​ Total long-term borrowings ​ 242,608 2.40 ​ ​ 242,568 2.37 ​ Total ​ $ 352,213 1.20 % ​ $ 336,023 1.41 %
Summary of Maturities of FHLB Advances	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ Weighted Average (in thousands, except rates) ​ Amount ​ Rate 2021 ​ $ 85,329 0.51 % 2022 ​ 75,000 1.87 ​ 2023 ​ 80,000 1.77 ​ 2024 ​ 7,300 1.16 ​ 2025 ​ 20,000 1.21 ​ 2026 and thereafter ​ 305 1.79 ​ Total FHLB advances ​ $ 267,934 1.34 %

DEPOSITS (Tables)

DEPOSITS (Tables)	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Summary of Time Deposits	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 December 31, 2020 Time less than $100,000 ​ $ 309,408 ​ $ 325,646 Time $100,000 through $250,000 ​ 201,996 ​ 278,940 Time $250,000 or more ​ 127,032 ​ 93,775 Total ​ $ 638,436 ​ $ 698,361
Time Deposit Maturities	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 ​ December 31, 2020 Within 1 year ​ $ 525,701 ​ $ 574,007 Over 1 year to 2 years ​ 56,988 ​ 61,584 Over 2 years to 3 years ​ 37,070 ​ 41,145 Over 3 years to 4 years ​ 10,682 ​ 12,875 Over 4 years to 5 years ​ 7,989 ​ 8,728 Over 5 years ​ 6 ​ 22 Total ​ $ 638,436 ​ $ 698,361

CAPITAL RATIOS AND SHAREHOLDE_2

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Schedule of Actual and Required Capital Ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Regulatory ​ Regulatory ​ ​ March 31, ​ Minimum to be ​ December 31, ​ Minimum to be ​ ​ 2021 ​ "Well-Capitalized" ​ 2020 ​ "Well-Capitalized" Company (consolidated) ​ Total capital to risk-weighted assets 13.83 % 10.50 % 13.56 % 10.50 % Common equity tier 1 capital to risk-weighted assets 10.55 7.00 10.49 7.00 ​ Tier 1 capital to risk-weighted assets 11.34 8.50 11.28 8.50 ​ Tier 1 capital to average assets 8.27 5.00 8.12 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Bank ​ Total capital to risk-weighted assets 13.62 % 10.50 % 13.27 % 10.50 % Common equity tier 1 capital to risk-weighted assets 12.66 7.00 12.52 7.00 ​ Tier 1 capital to risk-weighted assets 12.66 8.50 12.52 8.50 ​ Tier 1 capital to average assets 9.23 5.00 9.02 5.00 ​
Schedule of Components of Accumulated Other Comprehensive Income	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) March 31, 2021 December 31, 2020 Accumulated other comprehensive income, before tax: ​ ​ Net unrealized gain on AFS securities ​ $ 5,884 ​ $ 13,069 Net unrealized gain on hedging derivatives ​ 485 ​ 3,144 Net unrealized loss on post-retirement plans ​ (1,850) ​ (1,850) ​ ​ ​ ​ ​ ​ ​ Income taxes related to items of accumulated other comprehensive income: ​ ​ Net unrealized gain on AFS securities ​ (1,374) ​ (3,046) Net unrealized gain on hedging derivatives ​ (113) ​ (733) Net unrealized loss on post-retirement plans ​ 432 ​ 432 Accumulated other comprehensive income ​ $ 3,464 ​ $ 11,016
Schedule of Components of Other Comprehensive Income (Loss)	The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Before Tax Tax Effect Net of Tax Three Months Ended March 31, 2021 ​ ​ ​ Net unrealized loss on AFS securities: ​ ​ ​ Net unrealized loss arising during the period ​ $ (7,185) ​ $ 1,672 ​ $ (5,513) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on AFS securities ​ (7,185) ​ 1,672 ​ (5,513) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized gain on hedging derivatives: ​ ​ ​ ​ Net unrealized loss arising during the period ​ (2,659) ​ 620 ​ (2,039) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on cash flow hedging derivatives ​ (2,659) ​ 620 ​ (2,039) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on post-retirement plans: ​ ​ ​ ​ Net unrealized loss arising during the period ​ — ​ — ​ — Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on post-retirement plans ​ — ​ — ​ — Other comprehensive loss ​ $ (9,844) ​ $ 2,292 ​ $ (7,552) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ Net unrealized gain on AFS securities: ​ ​ ​ Net unrealized gain arising during the period ​ $ 5,492 ​ $ (1,378) ​ $ 4,114 Less: reclassification adjustment for gains (losses) realized in net income ​ 135 ​ (32) ​ 103 Net unrealized gain on AFS securities ​ 5,357 ​ (1,346) ​ 4,011 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on derivative hedgess: ​ ​ ​ ​ Net unrealized loss arising during the period ​ (2,382) ​ 650 ​ (1,732) Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on cash flow derivative hedges ​ (2,382) ​ 650 ​ (1,732) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized loss on post-retirement plans: ​ ​ ​ ​ Net unrealized loss arising during the period ​ — ​ — ​ — Less: reclassification adjustment for gains (losses) realized in net income ​ — ​ — ​ — Net unrealized loss on post-retirement plans ​ — ​ — ​ — Other comprehensive income ​ $ 2,975 ​ $ (696) ​ $ 2,279 ​
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net unrealized Net loss on Net unrealized ​ ​ ​ ​ gain ​ effective cash ​ loss ​ ​ ​ ​ ​ on AFS ​ flow hedging ​ on pension ​ ​ ​ (in thousands) ​ Securities ​ derivatives ​ plans ​ Total Three Months Ended March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 10,021 ​ $ 2,413 ​ $ (1,418) ​ $ 11,016 Other comprehensive loss before reclassifications ​ (5,513) ​ (2,039) ​ — ​ (7,552) Less: amounts reclassified from accumulated other comprehensive income ​ — ​ — ​ — ​ — Total other comprehensive loss ​ (5,513) ​ (2,039) ​ — ​ (7,552) Balance at end of period ​ $ 4,508 ​ $ 374 ​ $ (1,418) ​ $ 3,464 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 5,549 ​ $ (481) ​ $ (1,157) ​ $ 3,911 Other comprehensive gain (loss) before reclassifications ​ 4,114 ​ (1,732) ​ — ​ 2,382 Less: amounts reclassified from accumulated other comprehensive income ​ 103 ​ — ​ — ​ 103 Total other comprehensive income (loss) ​ 4,011 ​ (1,732) ​ — ​ 2,279 Balance at end of period ​ $ 9,560 ​ $ (2,213) ​ $ (1,157) ​ $ 6,190
Reclassification out of Accumulated Other Comprehensive Income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ Affected Line Item where (in thousands) 2021 2020 Net Income is Presented Net realized gains on AFS securities: ​ ​ ​ ​ ​ ​ Before tax ​ $ — ​ $ 135 ​ Non-interest income Tax effect ​ — ​ (32) ​ Tax expense Total reclassifications for the period ​ $ — ​ $ 103 ​ Net of tax (1) Net realized gains before tax include no realized gains and losses for the three months ended March 31, 2021 and gross realized gains of $146 thousand and realized losses of $11 thousand for the three months ended March 31, 2020.

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, (in thousands, except per share and share data) 2021 2020 Net income ​ $ 9,480 ​ $ 7,721 ​ ​ ​ ​ ​ ​ ​ Average number of basic common shares outstanding ​ 14,933,554 ​ 15,558,132 Plus: dilutive effect of stock options and awards outstanding ​ 73,161 ​ 34,463 Average number of diluted common shares outstanding (1) ​ 15,006,715 ​ 15,592,595 ​ ​ ​ ​ ​ ​ ​ Earnings per share: ​ ​ Basic ​ $ 0.63 ​ $ 0.50 Diluted ​ $ 0.63 ​ $ 0.50 (1) Average diluted shares outstanding are computed using the treasury stock method.

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Information About Derivative Assets and Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Notional ​ Average ​ Fair Value ​ Location Fair ​ ​ Amount ​ Maturity ​ Asset (Liability) Value Asset ​ (in thousands) (in years) (in thousands) (Liability) Cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on wholesale fundings ​ $ 75,000 ​ 3.8 ​ $ (1,379) ​ Other liabilities Interest rate swap on variable rate loans ​ ​ 50,000 ​ ​ 5.0 ​ ​ (278) ​ Other liabilities Total cash flow hedges ​ 125,000 ​ 4.3 ​ ​ (1,657) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on securities ​ 37,190 ​ 8.3 ​ 262 ​ Other assets Total fair value hedges ​ 37,190 ​ 8.3 ​ ​ 262 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward sale commitments ​ 31,382 ​ 0.2 ​ (85) ​ Other liabilities Customer Loan Swaps-MNA Counterparty ​ ​ 260,792 ​ ​ 6.8 ​ ​ (9,944) ​ Other liabilities Customer Loan Swaps-RPA Counterparty ​ ​ 119,285 ​ ​ 7.6 ​ ​ (5,482) ​ Other liabilities Customer Loan Swaps-Customer ​ ​ 380,077 ​ ​ 7.1 ​ ​ 15,426 ​ Other assets Total economic hedges ​ 791,536 ​ ​ ​ ​ (85) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate lock commitments ​ 6,735 ​ 0.2 ​ 46 ​ Other assets Total non-hedging derivatives ​ 6,735 ​ 0.2 ​ ​ 46 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 960,461 ​ ​ ​ ​ $ (1,434) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Notional ​ Average ​ Fair Value ​ Location Fair ​ ​ Amount ​ Maturity ​ Asset (Liability) Value Asset ​ (in thousands) (in years) (in thousands) (Liability) Cash flow hedges: ​ ​ ​ ​ ​ Interest rate swap on wholesale fundings ​ $ 75,000 ​ 4.0 ​ $ (2,664) ​ Other liabilities Total cash flow hedges ​ 75,000 ​ ​ ​ ​ (2,664) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on securities ​ 37,190 ​ 8.6 ​ 2,789 ​ Other assets Total fair value hedges ​ 37,190 ​ ​ ​ ​ 2,789 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward sale commitments ​ ​ 50,629 ​ 0.2 ​ (95) ​ Other liabilities Customer Loan Swaps-MNA Counterparty ​ ​ 235,947 ​ ​ 6.8 ​ ​ (15,938) ​ Other liabilities Customer Loan Swaps-RPA Counterparty ​ ​ 119,285 ​ ​ 7.9 ​ ​ (9,957) ​ Other liabilities Customer Loan Swaps-Customer ​ ​ 355,232 ​ ​ 7.1 ​ ​ 25,895 ​ Other assets Total economic hedges ​ 761,093 ​ ​ ​ ​ (95) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate lock commitments ​ 3,320 ​ 0.1 ​ 22 ​ Other assets Total non-hedging derivatives ​ 3,320 ​ ​ ​ ​ 22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 876,603 ​ ​ ​ ​ $ 52 ​ ​
Schedule of Amounts Recorded On The Balance Sheet	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Amount of Fair ​ ​ Location of Hedged Item on ​ Carrying Amount of Hedged ​ Value Hedging Adjustment in ​ Balance Sheet Assets (Liabilities) Carrying Amount March 31, 2021 ​ ​ Interest rate swap on securities Securities Available for Sale ​ $ 39,070 ​ $ 1,880 ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Interest rate swap on securities Securities Available for Sale ​ $ 40,209 ​ $ 3,019
Schedule of Derivative Instruments Gain (Loss)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021 ​ Amount of ​ Amount of ​ ​ ​ ​ Gain (Loss) ​ ​ ​ Gain (Loss) ​ ​ ​ ​ ​ ​ Recognized in ​ ​ ​ Reclassified ​ Location of ​ Amount of ​ ​ Other ​ Location of Gain (Loss) ​ from Other ​ Gain (Loss) ​ Gain (Loss) ​ ​ Comprehensive ​ Reclassified from Other ​ Comprehensive ​ Recognized in ​ Recognized (in thousands) Income Comprehensive Income Income Income in Income Cash flow hedges: ​ ​ ​ Interest rate swap on wholesale funding ​ $ 987 ​ Interest expense ​ $ (188) Interest expense ​ $ (188) Interest rate swap on variable rate loans ​ ​ (213) ​ Interest income ​ ​ 8 ​ Interest income ​ ​ 8 Total cash flow hedges ​ 774 ​ ​ (180) ​ (180) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ Interest rate swap on securities ​ (2,813) Interest income ​ (137) Interest income ​ (137) Total fair value hedges ​ (2,813) ​ ​ (137) ​ (137) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ Forward commitments ​ — Other income ​ 10 Other income ​ 10 Total economic hedges ​ — ​ ​ 10 ​ 10 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ Interest rate lock commitments ​ — Other income ​ 24 Other income ​ 24 Total non-hedging derivatives ​ — ​ ​ 24 ​ 24 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ (2,039) ​ ​ ​ $ (283) ​ $ (283) ​ The Company expects approximately $390 thousand of losses (pre-tax) related to the Company’s cash flow hedges to be reclassified to earnings from AOCI over the next 12 months. This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of March 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ Amount of ​ Amount of ​ ​ ​ ​ Gain (Loss) ​ ​ ​ Gain (Loss) ​ ​ ​ ​ ​ ​ Recognized in ​ ​ ​ Reclassified ​ Location of ​ Amount of ​ ​ Other ​ Location of Gain (Loss) ​ from Other ​ Gain (Loss) ​ Gain (Loss) ​ ​ Comprehensive ​ Reclassified from Other ​ Comprehensive ​ Recognized in ​ Recognized (in thousands) ​ Income ​ Comprehensive Income ​ Income ​ Income ​ in Income Cash flow hedges: ​ ​ ​ Interest rate swap on wholesale funding ​ $ (3,945) Interest expense ​ $ (1) Interest expense ​ $ (1) Total cash flow hedges ​ ​ (3,945) ​ ​ ​ (1) ​ ​ (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedges: ​ ​ ​ ​ Interest rate swap on securities ​ 2,213 Interest income ​ (18) Interest income ​ (18) Total economic hedges ​ ​ 2,213 ​ ​ ​ (18) ​ (18) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Economic hedges: ​ ​ ​ ​ Forward commitments ​ — Other income ​ (11) Other income ​ (11) Total economic hedges ​ ​ — ​ ​ ​ (11) ​ (11) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-hedging derivatives: ​ ​ ​ Interest rate lock commitments ​ — Other income ​ (34) Other Income ​ (34) Total non-hedging derivatives ​ ​ — ​ ​ ​ (34) ​ (34) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ (1,732) ​ $ (64) ​ $ (64)
Schedule of Offsetting Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Offset in the Consolidated Balance Sheet ​ ​ Derivative ​ ​ ​ Cash Collateral ​ ​ ​ (in thousands) Liabilities Derivative Assets Pledged Net Amount As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ Customer Loan Derivatives: ​ ​ ​ ​ MNA counterparty ​ $ (9,944) ​ $ 9,944 ​ $ 12,700 ​ $ 12,700 RPA counterparty ​ (5,482) ​ 5,482 ​ — ​ — Total ​ $ (15,426) ​ $ 15,426 ​ $ 12,700 ​ $ 12,700 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Offset in the Consolidated Balance Sheet ​ ​ Derivative ​ ​ ​ Cash Collateral ​ ​ ​ (in thousands) Liabilities Derivative Assets Pledged Net Amount As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ Customer Loan Derivatives: ​ ​ ​ ​ MNA counterparty ​ $ (15,938) ​ $ 15,938 ​ $ 23,450 ​ $ 23,450 RPA counterparty ​ (9,957) ​ 9,957 ​ — ​ — Total ​ $ (25,895) ​ $ 25,895 ​ $ 23,450 ​ $ 23,450

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ Level 1 Level 2 Level 3 Total (in thousands) ​ Inputs ​ Inputs ​ Inputs ​ Fair Value Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ — ​ $ 214,607 ​ $ — ​ $ 214,607 US Government agency ​ — ​ 76,185 ​ — ​ 76,185 Private label ​ — ​ 47,541 ​ — ​ 47,541 Obligations of states and political subdivisions thereof ​ — ​ 187,863 ​ — ​ 187,863 Corporate bonds ​ — ​ 100,207 ​ — ​ 100,207 Derivative assets ​ — ​ 15,426 ​ 46 ​ 15,472 Derivative liabilities ​ — ​ (16,805) ​ (85) ​ (16,890) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total (in thousands) ​ Inputs ​ Inputs ​ Inputs ​ Fair Value Available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ US Government-sponsored enterprises ​ $ — ​ $ 212,390 ​ $ — ​ $ 212,390 US Government agency ​ — ​ 85,632 ​ — ​ 85,632 Private label ​ — ​ 19,709 ​ — ​ 19,709 Obligations of states and political subdivisions thereof ​ — ​ 169,004 ​ — ​ 169,004 Corporate bonds ​ — ​ 98,311 ​ — ​ 98,311 Derivative assets ​ — ​ 28,684 ​ 22 ​ 28,706 Derivative liabilities ​ — ​ (28,559) ​ (95) ​ (28,654)
Schedule of Changes in Level 3 Assets Measured on a Recurring Basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets (Liabilities) ​ ​ Interest Rate Lock ​ Forward (in thousands) Commitments Commitments Three Months Ended March 31, 2021 ​ ​ ​ ​ Balance at beginning of period ​ $ 22 ​ $ (95) Realized gain recognized in non-interest income ​ 24 ​ 10 Balance at end of period ​ $ 46 ​ $ (85) ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ Balance at beginning of period ​ $ 59 ​ $ (84) Realized gain recognized in non-interest income ​ 34 ​ 11 Balance at end of period ​ $ 93 ​ $ (73)
Schedule of Changes in Level 3 Liabilities Measured on a Recurring Basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets (Liabilities) ​ ​ Interest Rate Lock ​ Forward (in thousands) Commitments Commitments Three Months Ended March 31, 2021 ​ ​ ​ ​ Balance at beginning of period ​ $ 22 ​ $ (95) Realized gain recognized in non-interest income ​ 24 ​ 10 Balance at end of period ​ $ 46 ​ $ (85) ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ Balance at beginning of period ​ $ 59 ​ $ (84) Realized gain recognized in non-interest income ​ 34 ​ 11 Balance at end of period ​ $ 93 ​ $ (73)
Schedule of Quantitative Information, Valuation, Recurring	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Significant ​ ​ Fair Value ​ Fair Value ​ ​ ​ ​ ​ Unobservable ​ (in thousands, except ratios) March 31, 2021 December 31, 2020 ​ Valuation Techniques Unobservable Inputs Input Value ​ Assets (Liabilities) ​ ​ ​ ​ ​ ​ ​ ​ Interest Rate Lock Commitment $ 46 ​ $ 22 ​ Historical trend Closing Ratio ​ 90 % ​ ​ ​ ​ ​ ​ Pricing Model ​ Origination Costs, per loan ​ $ 1.7 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward Commitments ​ (85) ​ (95) ​ Quoted prices for similar loans in active markets Freddie Mac pricing system ​ Pair-off contract price ​ Total ​ $ (39) ​ $ (73) ​ ​ ​
Summary of Applicable Non-Recurring Fair Value Measurements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurement ​ ​ March 31, 2021 ​ December 31, 2020 ​ March 31, 2021 ​ Date as of March 31, 2021 ​ ​ Level 3 ​ Level 3 ​ Total ​ Level 3 (in thousands) Inputs Inputs Gains (Losses) Inputs Assets ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ $ 10,556 ​ $ 8,746 ​ $ (1,810) ​ March 2021 Capitalized servicing rights ​ 4,693 ​ ​ 3,605 ​ (1,088) March 2021 Premises held for sale ​ 971 ​ ​ 962 ​ (9) December 2020 Total ​ $ 16,220 ​ $ 13,313 ​ $ (2,907)
Schedule of Quantitative Information, Valuation, Non-recurring	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands, except ratios) Fair Value March 31, 2021 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) Assets ​ ​ ​ ​ Individually evaluated loans ​ $ 7,238 Fair value of collateral-appraised value Loss severity ​ ​ 0% to 70% ​ ​ ​ ​ ​ ​ ​ Appraised value ​ ​ $0 to $1,792 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ 3,318 Discount cash flow Discount rate ​ 2.88% to 9.50% ​ ​ ​ ​ ​ ​ ​ Cash flows ​ ​ $7 to $953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capitalized servicing rights ​ 4,693 Discounted cash flow Constant prepayment rate (CPR) ​ 13.38 ​ ​ ​ Discount rate ​ 10.04 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Premises held for sale ​ 971 Fair value of asset less selling costs Appraised value ​ ​ $220 to $386 ​ ​ ​ ​ Selling Costs ​ 6% ​ Total ​ $ 16,220 ​ ​ (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties. (b) The carrying value of premises held for sale was $0.0 million as of March 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands, except ratios) Fair Value Dec 31, 2020 Valuation Techniques Unobservable Inputs Range (Weighted Average) (a) ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ $ 6,128 ​ Fair value of collateral-appraised value ​ Loss severity ​ ​ 0% to 70% ​ ​ ​ ​ ​ ​ ​ ​ Appraised value ​ ​ $0 to $1730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Individually evaluated loans ​ 2,618 ​ Discount cash flow ​ Discount rate ​ 3.50% to 9.50% ​ ​ ​ ​ ​ ​ ​ ​ Cash flows ​ ​ $19 to $953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capitalized servicing rights ​ 3,605 ​ Discounted cash flow ​ Constant prepayment rate (CPR) ​ 18.53% ​ ​ ​ ​ ​ ​ ​ ​ Discount rate ​ 10.05% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Premises held for sale ​ 962 ​ Fair value of asset less selling costs ​ Appraised value ​ $220 to $386 ​ ​ ​ ​ ​ ​ ​ ​ Selling Costs ​ 6% ​ Total ​ $ 13,313 ​ ​ ​ ​ ​ ​ ​ ​ (a) Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individual properties.
Summary of Estimated Fair Values, and Related Carrying Amounts, of Financial Instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Amount Value Level 1 Level 2 Level 3 Financial Assets ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 223,512 ​ $ 223,512 ​ $ 223,512 ​ $ — ​ $ — Securities available for sale ​ 626,403 ​ 626,403 ​ — ​ 626,403 ​ — FHLB stock ​ 14,826 ​ 14,826 ​ — ​ 14,826 ​ — Loans held for sale ​ ​ 10,148 ​ ​ 10,148 ​ ​ — ​ ​ — ​ ​ 10,148 Net loans ​ 2,527,411 ​ 2,518,606 ​ — ​ — ​ 2,518,606 Accrued interest receivable ​ 3,688 ​ 3,668 ​ — ​ 3,668 ​ — Cash surrender value of bank-owned life insurance policies ​ 78,388 ​ 78,388 ​ — ​ 78,388 ​ — Derivative assets ​ 15,472 ​ 15,472 ​ — ​ 15,426 ​ 46 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial Liabilities ​ ​ ​ ​ ​ Non-maturity deposits ​ $ 2,273,906 ​ $ 2,274,973 ​ $ — ​ $ 2,274,973 ​ $ — Time deposits ​ ​ 638,436 ​ ​ 636,670 ​ ​ — ​ ​ 636,670 ​ ​ — Securities sold under agreements to repurchase ​ ​ 24,276 ​ ​ 24,276 ​ ​ — ​ ​ 24,276 ​ ​ — FHLB advances ​ 267,934 ​ 271,622 ​ — ​ 271,622 ​ — Subordinated borrowings ​ 60,003 ​ 57,133 ​ — ​ 57,133 ​ — Derivative liabilities ​ 16,890 ​ 16,890 ​ — ​ 16,805 ​ 85 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Amount Value Level 1 Level 2 Level 3 Financial Assets ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 226,007 ​ $ 226,007 ​ $ 226,007 ​ $ — ​ $ — Securities available for sale ​ 585,046 ​ 585,046 ​ — ​ 585,046 ​ — FHLB stock ​ 14,036 ​ 14,036 ​ — ​ 14,036 ​ — Loans held for sale ​ ​ 23,988 ​ ​ 24,163 ​ ​ — ​ ​ — ​ ​ 24,163 Net loans ​ 2,543,803 ​ 2,547,970 ​ — ​ — ​ 2,547,970 Accrued interest receivable ​ 2,964 ​ 2,964 ​ — ​ 2,964 ​ — Cash surrender value of bank-owned life insurance policies ​ 77,870 ​ 77,870 ​ — ​ 77,870 ​ — Derivative assets ​ 28,706 ​ 28,706 ​ — ​ 28,684 ​ 22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial Liabilities ​ ​ ​ ​ ​ Non-maturity deposits ​ $ 2,207,854 ​ $ 2,122,222 ​ $ — ​ $ 2,122,222 ​ $ — Time deposits ​ ​ 698,361 ​ ​ 694,700 ​ ​ — ​ ​ 694,700 ​ ​ — Short-term other borrowings ​ 27,779 ​ 27,779 ​ — ​ 27,779 ​ — FHLB advances ​ 248,283 ​ 252,698 ​ — ​ 252,698 ​ — Subordinated borrowings ​ 59,961 ​ 57,091 ​ — ​ 57,091 ​ — Derivative liabilities ​ 28,654 ​ 28,654 ​ — ​ 28,559 ​ 95

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, (in thousands) 2021 2020 Major Products/Service Lines ​ ​ Trust management fees ​ $ 3,175 ​ $ 3,046 Financial services fees ​ 491 ​ 323 Interchange fees ​ 1,712 ​ 1,738 Customer deposit fees ​ 1,049 ​ 1,110 Other customer service fees ​ 209 ​ 264 Total ​ $ 6,636 ​ $ 6,481 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, (in thousands) 2021 2020 Timing of Revenue Recognition ​ ​ Products and services transferred at a point in time ​ $ 3,287 ​ $ 3,273 Products and services transferred over time ​ 3,349 ​ 3,208 Total ​ $ 6,636 ​ $ 6,481
Contract Balances from Contracts with Customers	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ March 31, 2021 ​ December 31, 2020 Balances from contracts with customers only: ​ ​ Other Assets ​ $ 1,293 ​ $ 1,121 Other Liabilities ​ 2,664 ​ 2,785

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
ROU Assets and Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) Classification March 31, 2021 December 31, 2020 Lease Right-of-Use Assets ​ ​ ​ ​ ​ Operating lease right-of-use assets Other assets ​ $ 10,056 ​ $ 10,338 ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease Liabilities ​ ​ Operating lease liabilities Other liabilities ​ 10,368 ​ 10,627
Additional Information Regarding Leases	​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 Weighted-average remaining lease term (in years) ​ ​ ​ ​ Operating leases ​ 9.02 ​ ​ 9.26 ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average discount rate ​ ​ ​ ​ Operating leases ​ 3.15 % ​ 3.15 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Three Months Ended (in thousands) March 31, 2021 March 31, 2020 Lease Costs ​ ​ Operating lease cost ​ $ 321 ​ $ 234 Variable lease cost ​ 81 ​ 144 Total lease cost ​ $ 402 ​ $ 378
Future Minimum Payments for Leases	​ ​ ​ ​ ​ (in thousands) Payments Twelve Months Ended: ​ March 31, 2022 ​ $ 1,300 March 31, 2023 ​ 1,319 March 31, 2024 ​ 1,323 March 31, 2025 ​ 1,240 March 31, 2026 ​ 1,085 Thereafter ​ 4,788 Total future minimum lease payments ​ 11,055 Amounts representing interest ​ (687) Present value of net future minimum lease payments ​ $ 10,368

BASIS OF PRESENTATION (Details)

BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance on AFS debt securities	$ 0	$ 0
PCD assets	12,500
PCD assets, allowance	$ 524
Deferred tax		5,639	$ 1,745
Equity		405,581	411,341	$ 403,755	$ 396,407
Accounting Standards Update 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance on AFS debt securities		$ 0
Reserve for unfunded commitments			359
Accounting Standards Update 2016-13 | Impact of CECL Adoption
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for unfunded commitments			1,616
Equity			$ (5,242)

BASIS OF PRESENTATION - Impact

BASIS OF PRESENTATION - Impact of Adoption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	$ 2,562,885	$ 2,551,064
Total allowance for credit losses on loans	19,082	23,653	$ 15,297	$ 15,353
Decrease to retained earnings	195,607	196,561
Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	47,862	46,541
Total allowance for credit losses on loans	58	94	57	67
Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	100,096	93,625
Total allowance for credit losses on loans	285	823	328	320
Total commercial loans | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	117,882	117,464
Total allowance for credit losses on loans	824	1,792	395	317
Total commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	1,084,381
Total commercial real estate | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	219,217	233,847
Total allowance for credit losses on loans	1,783	3,352	1,486	2,368
Total commercial real estate | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	716,776	733,507
Total allowance for credit losses on loans	7,864	5,902	5,314	4,695
Total commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	441,069
Total commercial and industrial | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	355,684	376,395
Total allowance for credit losses on loans	3,137	5,040	3,323	3,262
Total residential real estate | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	995,216	940,127
Total allowance for credit losses on loans	5,010	6,569	4,291	4,213
Total consumer | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	10,152	9,558
Total allowance for credit losses on loans	121	$ 81	$ 103	$ 111
Post-CECL Adoption Portfolio Segmentation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	2,562,885
Total allowance for credit losses on loans	24,310
Allowance for credit losses on OBS credit exposures	1,975
Total allowance for credit losses	26,285
Post-CECL Adoption Portfolio Segmentation | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	117,882
Total allowance for credit losses on loans	2,020
Post-CECL Adoption Portfolio Segmentation | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	219,217
Total allowance for credit losses on loans	2,491
Post-CECL Adoption Portfolio Segmentation | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	716,776
Total allowance for credit losses on loans	5,856
Post-CECL Adoption Portfolio Segmentation | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	47,862
Total allowance for credit losses on loans	98
Post-CECL Adoption Portfolio Segmentation | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	355,684
Total allowance for credit losses on loans	6,133
Post-CECL Adoption Portfolio Segmentation | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	995,216
Total allowance for credit losses on loans	6,742
Post-CECL Adoption Portfolio Segmentation | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	100,096
Total allowance for credit losses on loans	888
Post-CECL Adoption Portfolio Segmentation | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	10,152
Total allowance for credit losses on loans	82
Impact of CECL Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	5,228
Impact of CECL Adoption | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	40
Impact of CECL Adoption | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	603
Impact of CECL Adoption | Total commercial loans | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	1,196
Impact of CECL Adoption | Total commercial real estate | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	708
Impact of CECL Adoption | Total commercial real estate | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	(2,008)
Impact of CECL Adoption | Total commercial and industrial | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	2,996
Impact of CECL Adoption | Total residential real estate | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	1,732
Impact of CECL Adoption | Total consumer | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	(39)
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	2,562,885
Total allowance for credit losses on loans	19,082
Allowance for credit losses on OBS credit exposures	359
Total allowance for credit losses	19,441
Accounting Standards Update 2016-13 | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	117,882
Total allowance for credit losses on loans	824
Accounting Standards Update 2016-13 | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	219,217
Total allowance for credit losses on loans	1,783
Accounting Standards Update 2016-13 | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	716,776
Total allowance for credit losses on loans	7,864
Accounting Standards Update 2016-13 | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	47,862
Total allowance for credit losses on loans	58
Accounting Standards Update 2016-13 | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	355,684
Total allowance for credit losses on loans	3,137
Accounting Standards Update 2016-13 | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	995,216
Total allowance for credit losses on loans	5,010
Accounting Standards Update 2016-13 | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	100,096
Total allowance for credit losses on loans	285
Accounting Standards Update 2016-13 | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	10,152
Total allowance for credit losses on loans	121
Accounting Standards Update 2016-13 | Impact of CECL Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	5,228
Allowance for credit losses on OBS credit exposures	1,616
Total allowance for credit losses	6,844
Total increase in Allowance for credit losses	6,844
Total pre-tax impact	6,844
Tax effect	(1,602)
Decrease to retained earnings	5,242
Coverage ratio of ACL to total loans		0.94%
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	1,196
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	708
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	(2,008)
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	40
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	2,996
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	1,732
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	603
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for credit losses on loans	(39)
Accounting Standards Update 2016-13 | Pre-CECL Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	2,562,885
Total allowance for credit losses on loans	19,082
Allowance for credit losses on OBS credit exposures	359
Total allowance for credit losses	$ 19,441
Coverage ratio of ACL to total loans	0.76%
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	$ 131,123
Total allowance for credit losses on loans	1,044
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	953,258
Total allowance for credit losses on loans	10,199
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	63,431
Total allowance for credit losses on loans	80
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	377,638
Total allowance for credit losses on loans	3,302
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	923,891
Total allowance for credit losses on loans	4,078
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	102,464
Total allowance for credit losses on loans	258
Accounting Standards Update 2016-13 | Pre-CECL Adoption | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	11,080
Total allowance for credit losses on loans	121
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	(13,241)
Total allowance for credit losses on loans	(220)
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	(953,258)
Total allowance for credit losses on loans	(10,199)
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	219,217
Total allowance for credit losses on loans	1,783
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate non-owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	716,776
Total allowance for credit losses on loans	7,864
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Tax exempt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	(15,569)
Total allowance for credit losses on loans	(22)
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	(21,954)
Total allowance for credit losses on loans	(165)
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Residential mortgages
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	71,325
Total allowance for credit losses on loans	932
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Home equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	(2,368)
Total allowance for credit losses on loans	27
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Consumer other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	$ (928)

SECURITIES AVAILABLE FOR SALE -

SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Amortized Cost	$ 620,519	$ 571,977
Gross Unrealized Gains	11,823	14,637
Gross Unrealized Losses	(5,939)	(1,568)
Fair Value	626,403	585,046
US Government-sponsored enterprises
Investment Holdings [Line Items]
Amortized Cost	213,049	206,834
Gross Unrealized Gains	4,860	6,018
Gross Unrealized Losses	(3,302)	(462)
Fair Value	214,607	212,390
US Government agency
Investment Holdings [Line Items]
Amortized Cost	74,293	82,878
Gross Unrealized Gains	2,211	2,870
Gross Unrealized Losses	(319)	(116)
Fair Value	76,185	85,632
Private label
Investment Holdings [Line Items]
Amortized Cost	47,576	19,810
Gross Unrealized Gains	111	40
Gross Unrealized Losses	(146)	(141)
Fair Value	47,541	19,709
Obligations of states and political subdivisions thereof
Investment Holdings [Line Items]
Amortized Cost	185,985	164,766
Gross Unrealized Gains	3,081	4,244
Gross Unrealized Losses	(1,203)	(6)
Fair Value	187,863	169,004
Corporate bonds
Investment Holdings [Line Items]
Amortized Cost	99,616	97,689
Gross Unrealized Gains	1,560	1,465
Gross Unrealized Losses	(969)	(843)
Fair Value	$ 100,207	$ 98,311

SECURITIES AVAILABLE FOR SALE_2

SECURITIES AVAILABLE FOR SALE - Maturity of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Within 1 year	$ 4,776
Over 1 year to 5 years	20,745
Over 5 years to 10 years	75,062
Over 10 years	185,018
Total bonds and obligations	285,601
Mortgage-backed securities	334,918
Amortized Cost	620,519	$ 571,977
Fair Value
Within 1 year	4,848
Over 1 year to 5 years	20,965
Over 5 years to 10 years	73,650
Over 10 years	188,607
Total bonds and obligations	288,070
Mortgage-backed securities	338,333
Total securities available for sale	$ 626,403	$ 585,046

SECURITIES AVAILABLE FOR SALE_3

SECURITIES AVAILABLE FOR SALE - Gains and Losses from AFS Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
SECURITIES AVAILABLE FOR SALE
Gross gains on sales of available for sale securities		$ 146
Gross losses on sales of available for sale securities		(11)
Net gains on sale of available for sale securities	$ 0	$ 135

SECURITIES AVAILABLE FOR SALE_4

SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Gross Unrealized Losses
Less Than Twelve Months	$ 4,706	$ 815
Over Twelve Months	1,233	753
Total	5,939	1,568
Fair Value
Less Than Twelve Months	198,357	74,412
Over Twelve Months	46,422	38,846
Total	244,779	113,258
US Government-sponsored enterprises
Gross Unrealized Losses
Less Than Twelve Months	3,073	209
Over Twelve Months	229	253
Total	3,302	462
Fair Value
Less Than Twelve Months	96,384	40,285
Over Twelve Months	3,803	4,323
Total	100,187	44,608
US Government agency
Gross Unrealized Losses
Less Than Twelve Months	300	45
Over Twelve Months	19	71
Total	319	116
Fair Value
Less Than Twelve Months	14,716	6,776
Over Twelve Months	4,204	3,297
Total	18,920	10,073
Private label
Gross Unrealized Losses
Less Than Twelve Months	2
Over Twelve Months	144	141
Total	146	141
Fair Value
Less Than Twelve Months	15,822
Over Twelve Months	19,257	19,514
Total	35,079	19,514
Obligations of states and political subdivisions thereof
Gross Unrealized Losses
Less Than Twelve Months	1,203	6
Total	1,203	6
Fair Value
Less Than Twelve Months	56,813	5,577
Total	56,813	5,577
Corporate bonds
Gross Unrealized Losses
Less Than Twelve Months	128	555
Over Twelve Months	841	288
Total	969	843
Fair Value
Less Than Twelve Months	14,622	21,774
Over Twelve Months	19,158	11,712
Total	$ 33,780	$ 33,486

SECURITIES AVAILABLE FOR SALE_5

SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)security	Jan. 01, 2021USD ($)
Investment Holdings [Line Items]
Allowance on AFS debt securities | $	$ 0	$ 0
Accounting Standards Update 2016-13
Investment Holdings [Line Items]
Allowance on AFS debt securities | $	$ 0
US Government-sponsored enterprises
Investment Holdings [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	50
Available for sale securities portfolio, number of securities (security)	556
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	1.55%
US Government agency
Investment Holdings [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	13
Available for sale securities portfolio, number of securities (security)	158
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	0.43%
Private label
Investment Holdings [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	12
Available for sale securities portfolio, number of securities (security)	29
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	0.31%
Obligations of states and political subdivisions thereof
Investment Holdings [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	16
Available for sale securities portfolio, number of securities (security)	144
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	0.65%
Corporate bonds
Investment Holdings [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	8
Available for sale securities portfolio, number of securities (security)	33
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	0.97%

LOANS AND ALLOWANCE FOR CREDI_3

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)loan	Dec. 31, 2020USD ($)loan	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,551,064	$ 2,562,885
Allowance for credit losses	23,653	19,082	$ 15,297	$ 15,353
Net loans	2,527,411	2,543,803
Accrued interest receivable for loans	11,900	11,400
Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	46,541	47,862
Allowance for credit losses	94	58	57	67
Net loans	46,541
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	93,625	100,096
Allowance for credit losses	$ 823	$ 285	328	320
Paycheck Protection Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans outstanding | loan	1,057	746
Outstanding principal balance	$ 77,900	$ 53,800
Paycheck Protection Program, Round 2021 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans outstanding | loan	956
Outstanding principal balance		57,400
Total commercial loans | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 117,464	117,882
Allowance for credit losses	1,792	824	395	317
Net loans	117,464
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,084,381
Total commercial real estate | Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	233,847	219,217
Allowance for credit losses	3,352	1,783	1,486	2,368
Net loans	233,847
Total commercial real estate | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	733,507	716,776
Allowance for credit losses	5,902	7,864	5,314	4,695
Net loans	733,507
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		441,069
Total commercial and industrial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	376,395	355,684
Allowance for credit losses	5,040	3,137	3,323	3,262
Net loans	376,395
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	940,127	995,216
Allowance for credit losses	6,569	5,010	4,291	4,213
Total consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,558	10,152
Allowance for credit losses	$ 81	$ 121	$ 103	$ 111

LOANS AND ALLOWANCE FOR CREDI_4

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Unamortized Net Costs and Premiums (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unamortized net loan origination costs	$ 3,774	$ 5,157
Unamortized net premium on purchased loans	(82)	(85)
Total unamortized net costs and premiums	$ 3,692	$ 5,072

LOANS AND ALLOWANCE FOR CREDI_5

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Activity in the allowance for loan losses
Balance at beginning of period	$ 19,082	$ 15,353	$ 15,353
Charged-off loans	(216)	(1,211)
Recoveries on charged-off loans	48	44
Provision for credit losses	(489)	1,111
Balance at end of period	23,653	15,297	19,082
Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	5,228
Balance at end of period			5,228
Commercial construction | Total commercial loans
Activity in the allowance for loan losses
Balance at beginning of period	824	317	317
Recoveries on charged-off loans	18
Provision for credit losses	(246)	78
Balance at end of period	1,792	395	824
Commercial construction | Total commercial loans | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	1,196
Balance at end of period			1,196
Commercial real estate owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	1,783	2,368	2,368
Charged-off loans	(153)
Recoveries on charged-off loans	0
Provision for credit losses	1,014	(882)
Balance at end of period	3,352	1,486	1,783
Commercial real estate owner occupied | Total commercial real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	708
Balance at end of period			708
Commercial real estate non-owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	7,864	4,695	4,695
Charged-off loans		(871)
Recoveries on charged-off loans	4	25
Provision for credit losses	42	1,465
Balance at end of period	5,902	5,314	7,864
Commercial real estate non-owner occupied | Total commercial real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	(2,008)
Balance at end of period			(2,008)
Tax exempt
Activity in the allowance for loan losses
Balance at beginning of period	58	67	67
Provision for credit losses	(4)	(10)
Balance at end of period	94	57	58
Tax exempt | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	40
Balance at end of period			40
Commercial and industrial | Total commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period	3,137	3,262	3,262
Charged-off loans		(179)
Recoveries on charged-off loans	1	9
Provision for credit losses	(1,094)	231
Balance at end of period	5,040	3,323	3,137
Commercial and industrial | Total commercial and industrial | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	2,996
Balance at end of period			2,996
Residential mortgages | Total residential real estate
Activity in the allowance for loan losses
Balance at beginning of period	5,010	4,213	4,213
Charged-off loans	(40)	(8)
Recoveries on charged-off loans	13	7
Provision for credit losses	(146)	79
Balance at end of period	6,569	4,291	5,010
Residential mortgages | Total residential real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	1,732
Balance at end of period			1,732
Home equity
Activity in the allowance for loan losses
Balance at beginning of period	285	320	320
Charged-off loans	(22)
Recoveries on charged-off loans	11
Provision for credit losses	(54)	8
Balance at end of period	823	328	285
Home equity | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	603
Balance at end of period			603
Consumer other | Total consumer
Activity in the allowance for loan losses
Balance at beginning of period	121	111	111
Charged-off loans	(1)	(153)
Recoveries on charged-off loans	1	3
Provision for credit losses	(1)	142
Balance at end of period	81	103	121
Consumer other | Total consumer | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	(39)
Balance at end of period			(39)
Unfunded Loan Commitment
Activity in the allowance for loan losses
Balance at beginning of period	359	$ 314	314
Provision for credit losses	(156)		45
Balance at end of period	1,819		359
Unfunded Loan Commitment | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	$ 1,616
Balance at end of period			$ 1,616

LOANS AND ALLOWANCE FOR CREDI_6

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Credit quality information
2021	$ 138,893
2020	465,046
2019	358,117
2018	245,992
2017	345,062
Prior	997,954
Total	2,527,411	$ 2,543,803
Total	2,551,064	2,562,885
Total commercial real estate
Credit quality information
Total		1,084,381
Total commercial and industrial
Credit quality information
Total		441,069
Residential real estate
Credit quality information
Total		923,891
Consumer
Credit quality information
Total		113,544
Performing
Credit quality information
Total		1,026,939
Performing | Residential real estate
Credit quality information
Total		914,749
Performing | Consumer
Credit quality information
Total		112,190
Nonperforming
Credit quality information
Total		10,496
Nonperforming | Residential real estate
Credit quality information
Total		9,142
Nonperforming | Consumer
Credit quality information
Total		1,354
Pass
Credit quality information
Total		1,475,789
Pass | Total commercial real estate
Credit quality information
Total		1,053,773
Pass | Total commercial and industrial
Credit quality information
Total		422,016
Special mention
Credit quality information
Total		8,846
Special mention | Total commercial real estate
Credit quality information
Total		6,075
Special mention | Total commercial and industrial
Credit quality information
Total		2,771
Substandard
Credit quality information
Total		37,447
Substandard | Total commercial real estate
Credit quality information
Total		22,267
Substandard | Total commercial and industrial
Credit quality information
Total		15,180
Doubtful
Credit quality information
Total		3,365
Doubtful | Total commercial real estate
Credit quality information
Total		2,265
Doubtful | Total commercial and industrial
Credit quality information
Total		1,100
Loss
Credit quality information
Total		3
Loss | Total commercial real estate
Credit quality information
Total		1
Loss | Total commercial and industrial
Credit quality information
Total		2
Commercial construction | Total commercial loans
Credit quality information
2021	1,262
2020	61,092
2019	29,027
2018	26,083
Total	117,464
Total	117,464	117,882
Commercial construction | Pass | Total commercial loans
Credit quality information
2021	1,262
2020	61,092
2019	29,027
2018	26,083
Total	117,464
Commercial real estate owner occupied | Total commercial real estate
Credit quality information
2021	915
2020	14,931
2019	35,226
2018	31,111
2017	21,849
Prior	129,815
Total	233,847
Total	233,847	219,217
Commercial real estate owner occupied | Pass | Total commercial real estate
Credit quality information
2021	915
2020	14,931
2019	34,446
2018	30,661
2017	21,587
Prior	118,206
Total	220,746
Commercial real estate owner occupied | Special mention | Total commercial real estate
Credit quality information
2019	780
Prior	1,102
Total	1,882
Commercial real estate owner occupied | Substandard | Total commercial real estate
Credit quality information
2018	262
2017	262
Prior	10,319
Total	10,843
Commercial real estate owner occupied | Doubtful | Total commercial real estate
Credit quality information
2018	188
Prior	188
Total	376
Commercial real estate non-owner occupied | Total commercial real estate
Credit quality information
2021	36,535
2020	153,240
2019	121,209
2018	42,746
2017	155,955
Prior	223,822
Total	733,507
Total	733,507	716,776
Commercial real estate non-owner occupied | Pass | Total commercial real estate
Credit quality information
2021	36,535
2020	153,240
2019	121,209
2018	42,460
2017	155,787
Prior	218,391
Total	727,622
Commercial real estate non-owner occupied | Special mention | Total commercial real estate
Credit quality information
2018	118
Prior	1,779
Total	1,897
Commercial real estate non-owner occupied | Substandard | Total commercial real estate
Credit quality information
2018	168
2017	168
Prior	3,463
Total	3,799
Commercial real estate non-owner occupied | Doubtful | Total commercial real estate
Credit quality information
Prior	189
Total	189
Tax exempt
Credit quality information
2021	678
2020	1,845
2019	1,131
2018	14,840
2017	5,470
Prior	22,577
Total	46,541
Total	46,541	47,862
Tax exempt | Pass
Credit quality information
2021	678
2020	1,845
2019	1,131
2018	14,840
2017	5,470
Prior	22,577
Total	46,541
Commercial and industrial | Total commercial and industrial
Credit quality information
2021	59,772
2020	87,481
2019	43,269
2018	35,083
2017	67,192
Prior	83,598
Total	376,395
Total	376,395	355,684
Commercial and industrial | Pass | Total commercial and industrial
Credit quality information
2021	59,576
2020	87,130
2019	41,814
2018	19,119
2017	64,289
Prior	80,963
Total	352,891
Commercial and industrial | Special mention | Total commercial and industrial
Credit quality information
2021	196
2020	351
2019	844
2018	744
2017	2,683
Prior	1,150
Total	5,969
Commercial and industrial | Substandard | Total commercial and industrial
Credit quality information
2019	611
2018	15,220
2017	88
Prior	1,039
Total	16,958
Commercial and industrial | Doubtful | Total commercial and industrial
Credit quality information
2017	131
Prior	445
Total	576
Residential mortgages | Residential real estate
Credit quality information
2021	36,563
2020	132,520
2019	114,920
2018	86,316
2017	85,993
Prior	483,815
Total	940,127
Residential mortgages | Performing | Residential real estate
Credit quality information
2021	36,563
2020	132,520
2019	114,920
2018	86,017
2017	85,719
Prior	475,246
Total	930,985
Residential mortgages | Nonperforming | Residential real estate
Credit quality information
2018	299
2017	274
Prior	8,569
Total	9,142
Home equity
Credit quality information
2021	2,137
2020	11,009
2019	11,783
2018	8,800
2017	8,183
Prior	51,713
Total	93,625	$ 100,096
Home equity | Performing
Credit quality information
2021	2,137
2020	11,009
2019	11,783
2018	8,800
2017	8,118
Prior	50,434
Total	92,281
Home equity | Nonperforming
Credit quality information
2017	65
Prior	1,279
Total	1,344
Consumer other | Consumer
Credit quality information
2021	1,030
2020	2,928
2019	1,552
2018	1,013
2017	420
Prior	2,615
Total	9,558
Consumer other | Performing | Consumer
Credit quality information
2021	1,030
2020	2,928
2019	1,552
2018	1,013
2017	420
Prior	2,605
Total	9,548
Consumer other | Nonperforming | Consumer
Credit quality information
Prior	10
Total	$ 10

LOANS AND ALLOWANCE FOR CREDI_7

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 15,728	$ 21,403
Current	2,535,336	2,541,482
Total loans	2,551,064	2,562,885
Past Due More Than 90 days and Accruing	189	267
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,236	12,307
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,722	4,263
90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,770	4,833
Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		1,084,381
Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans		441,069
Commercial construction | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due		75
Current	117,464	117,807
Total loans	117,464	117,882
Commercial construction | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		74
Commercial construction | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		1
Commercial real estate owner occupied | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	341	2,211
Current	233,506	217,006
Total loans	233,847	219,217
Commercial real estate owner occupied | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	10	1,309
Commercial real estate owner occupied | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		464
Commercial real estate owner occupied | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	331	438
Commercial real estate non-owner occupied | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,140	1,801
Current	732,367	714,975
Total loans	733,507	716,776
Past Due More Than 90 days and Accruing	50
Commercial real estate non-owner occupied | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	644	503
Commercial real estate non-owner occupied | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	179	674
Commercial real estate non-owner occupied | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	317	624
Tax exempt
Financing Receivable, Past Due [Line Items]
Current	46,541	47,862
Total loans	46,541	47,862
Commercial and industrial | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	763	354
Current	375,632	355,330
Total loans	376,395	355,684
Past Due More Than 90 days and Accruing	15
Commercial and industrial | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	364	161
Commercial and industrial | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	399	193
Residential mortgages | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	12,354	14,889
Current	927,773	980,327
Total loans	940,127	995,216
Past Due More Than 90 days and Accruing	24
Residential mortgages | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,815	9,178
Residential mortgages | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,345	2,511
Residential mortgages | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,194	3,200
Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,026	2,051
Current	92,599	98,045
Total loans	93,625	100,096
Past Due More Than 90 days and Accruing		267
Home equity | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	399	1,062
Home equity | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	198	614
Home equity | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	429	375
Consumer other | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	104	22
Current	9,454	10,130
Total loans	9,558	10,152
Past Due More Than 90 days and Accruing	100
Consumer other | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4	20
Consumer other | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 100	$ 2

LOANS AND ALLOWANCE FOR CREDI_8

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Non-accrual loans
Total loans	$ 14,069	$ 11,550
Nonaccrual With No Related Allowance	6,035	8,464
Nonaccrual, Past Due 90 days and Accruing	189	267
Commercial construction | Total commercial loans
Non-accrual loans
Total loans		258
Commercial real estate owner occupied | Total commercial real estate
Non-accrual loans
Total loans	1,576	2,400
Nonaccrual With No Related Allowance	895	929
Commercial real estate non-owner occupied | Total commercial real estate
Non-accrual loans
Total loans	930	383
Nonaccrual With No Related Allowance	742	118
Nonaccrual, Past Due 90 days and Accruing	50
Commercial and industrial | Total commercial and industrial
Non-accrual loans
Total loans	1,067	1,223
Nonaccrual With No Related Allowance	641	1,065
Nonaccrual, Past Due 90 days and Accruing	15
Residential mortgages | Total residential real estate
Non-accrual loans
Total loans	9,142	5,883
Nonaccrual With No Related Allowance	3,405	4,948
Nonaccrual, Past Due 90 days and Accruing	24
Home equity
Non-accrual loans
Total loans	1,344	1,345
Nonaccrual With No Related Allowance	352	1,346
Nonaccrual, Past Due 90 days and Accruing		267
Consumer other | Total consumer
Non-accrual loans
Total loans	10	58
Nonaccrual With No Related Allowance		$ 58
Nonaccrual, Past Due 90 days and Accruing	$ 100

LOANS AND ALLOWANCE FOR CREDI_9

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Allowance for loan losses
Loans and Leases Receivable, Net Amount	$ 2,527,411	$ 2,543,803
Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	13,566	13,693
Other
Allowance for loan losses
Loans and Leases Receivable, Net Amount	503	607
Commercial construction | Total commercial loans
Allowance for loan losses
Loans and Leases Receivable, Net Amount	117,464
Commercial construction | Total commercial loans | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount		259
Commercial real estate owner occupied | Total commercial real estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	233,847
Commercial real estate owner occupied | Total commercial real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	1,576	3,441
Commercial real estate non-owner occupied | Total commercial real estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	733,507
Commercial real estate non-owner occupied | Total commercial real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	930	383
Tax exempt
Allowance for loan losses
Loans and Leases Receivable, Net Amount	46,541
Commercial and industrial | Total commercial and industrial
Allowance for loan losses
Loans and Leases Receivable, Net Amount	376,395
Commercial and industrial | Total commercial and industrial | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	564	625
Commercial and industrial | Total commercial and industrial | Other
Allowance for loan losses
Loans and Leases Receivable, Net Amount	503	607
Residential mortgages | Total residential real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	9,142	7,432
Home equity | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	1,344	1,493
Consumer other | Total consumer | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	$ 10	$ 60

LOANS AND ALLOWANCE FOR CRED_10

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Recorded Investment
Total	$ 9,605
Unpaid Principal Balance
Total	10,228
Related Allowance
With an allowance recorded	1,513
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment	8,067
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest Income Recognized	78
Specific reserve for loans individually evaluated, threshold		$ 150
Commercial construction
Recorded Investment
With an allowance recorded	258
Unpaid Principal Balance
With an allowance recorded	258
Related Allowance
With an allowance recorded	205
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with related allowance	203
Other commercial real estate
Recorded Investment
With no related allowance	2,001
With an allowance recorded	1,963
Unpaid Principal Balance
With no related allowance	2,047
With an allowance recorded	2,108
Related Allowance
With an allowance recorded	1,038
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	1,610
Average recorded investment, with related allowance	1,973
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest income recognized, with related allowance	17
Commercial
Recorded Investment
With no related allowance	1,095
With an allowance recorded	282
Unpaid Principal Balance
With no related allowance	1,254
With an allowance recorded	289
Related Allowance
With an allowance recorded	164
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	1,140
Average recorded investment, with related allowance	73
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest income recognized, with no related allowance	4
Agricultural
Recorded Investment
With no related allowance	361
Unpaid Principal Balance
With no related allowance	150
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	114
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest income recognized, with no related allowance	2
Residential mortgages
Recorded Investment
With no related allowance	2,745
With an allowance recorded	887
Unpaid Principal Balance
With no related allowance	3,165
With an allowance recorded	944
Related Allowance
With an allowance recorded	106
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	1,077
Average recorded investment, with related allowance	1,865
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest income recognized, with no related allowance	17
Interest income recognized, with related allowance	37
Home equity
Recorded Investment
With an allowance recorded	13
Unpaid Principal Balance
With an allowance recorded	13
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with related allowance	12
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest income recognized, with related allowance	1
Total commercial real estate
Recorded Investment
Total	4,222
Unpaid Principal Balance
Total	4,413
Related Allowance
With an allowance recorded	1,243
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment	3,786
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest Income Recognized	17
Total commercial and industrial
Recorded Investment
Total	1,738
Unpaid Principal Balance
Total	1,693
Related Allowance
With an allowance recorded	164
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment	1,327
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest Income Recognized	6
Total residential real estate
Recorded Investment
Total	3,632
Unpaid Principal Balance
Total	4,109
Related Allowance
With an allowance recorded	106
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment	2,942
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest Income Recognized	54
Total consumer
Recorded Investment
Total	13
Unpaid Principal Balance
Total	13
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment	12
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Interest Income Recognized	$ 1

LOANS AND ALLOWANCE FOR CRED_11

LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Borrower's sustained repayment performance period	6 months
Number of Modifications	0	6
Pre-Modification Outstanding Recorded Investment		$ 130
Post-Modification Outstanding Recorded Investment		$ 501
Number of modifications which subsequently defaulted | loan	0
Interest rate, forbearance and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		4
Post-Modification Outstanding Recorded Investment		$ 467
Forbearance and interest only payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		1
Post-Modification Outstanding Recorded Investment		$ 25
Maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		1
Post-Modification Outstanding Recorded Investment		$ 9
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		1
Pre-Modification Outstanding Recorded Investment		$ 26
Post-Modification Outstanding Recorded Investment		$ 25
Total commercial real estate | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		1
Pre-Modification Outstanding Recorded Investment		$ 54
Post-Modification Outstanding Recorded Investment		$ 259
Total commercial and industrial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		3
Pre-Modification Outstanding Recorded Investment		$ 41
Post-Modification Outstanding Recorded Investment		$ 208
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans collateralized by real estate property in the process of foreclosure	$ 343		$ 917
Total consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | loan		1
Pre-Modification Outstanding Recorded Investment		$ 9
Post-Modification Outstanding Recorded Investment		$ 9

LOANS AND ALLOWANCE FOR CRED_12

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Mortgage Banking (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total residential loans included in held for sale loans	$ 10,148	$ 23,988
Residential mortgages | Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total residential loans included in held for sale loans	10,100	23,700
Forward delivery commitments	31,300	50,600
Sale of loans	69,200	70,400
Net gains on sales of loans	$ 1,900	$ 2,200

BORROWED FUNDS - Summary of Bor

BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Short-term borrowings
Carrying Value	$ 109,605	$ 93,455
Weighted Average Rate	0.26%	0.44%
Long-term borrowings
Carrying Value	$ 242,608	$ 242,568
Weighted Average Rate	2.40%	2.37%
Total borrowings	$ 352,213	$ 336,023
Weighted Average Rate	1.20%	1.41%
Advances from the FHLB
Short-term borrowings
Carrying Value	$ 85,329	$ 65,676
Weighted Average Rate	0.51%	1.19%
Long-term borrowings
Carrying Value	$ 182,605	$ 182,607
Weighted Average Rate	1.73%	1.73%
Other borrowings
Short-term borrowings
Carrying Value	$ 24,276	$ 27,779
Weighted Average Rate	0.16%	0.15%
Subordinated borrowings
Long-term borrowings
Carrying Value	$ 60,003	$ 59,961
Weighted Average Rate	4.45%	4.34%

BORROWED FUNDS - Additional Inf

BORROWED FUNDS - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding advances of FRB	$ 109,605,000	$ 93,455,000
Outstanding amount	242,608,000	242,568,000
Financial Guarantee | NHTB Capital Trust II and NHTB Capital Trust III
Debt Instrument [Line Items]
Debentures issued by variable interest entities	$ 20,600,000
LIBOR | Financial Guarantee
Debt Instrument [Line Items]
Interest rate margin	2.79%
Callable Advances
Debt Instrument [Line Items]
Outstanding amount	$ 20,000,000	20,000,000
Amortizing Advances
Debt Instrument [Line Items]
Outstanding amount	305,000,000	307,000,000
Advances from the FHLB
Debt Instrument [Line Items]
Line of credit maintained	1,000,000
Outstanding balance on the FHLB line of credit	0	0
Outstanding advances of FRB	85,329,000	65,676,000
Outstanding amount	182,605,000	182,607,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Line of credit maintained	73,800,000
Outstanding advances of FRB	0	0
Federal Reserve Bank Advances | Unsecured Debt
Debt Instrument [Line Items]
Line of credit maintained	50,000,000	50,000,000
Outstanding balance on unused unsecured federal funds line of credit	$ 0	$ 0

BORROWED FUNDS - Maturities of

BORROWED FUNDS - Maturities of FHLB Advances (Details) $ in Thousands	Mar. 31, 2021USD ($)
Amount
2021	$ 85,329
2022	75,000
2023	80,000
2024	7,300
2025	20,000
2026 and thereafter	305
Total FHLB advances	$ 267,934
Weighted Average Rate
2021	0.51%
2022	1.87%
2023	1.77%
2024	1.16%
2025	1.21%
2026 and thereafter	1.79%
Total FHLB advances	1.34%

BORROWED FUNDS - Subordinated a

BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - Subordinated borrowings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Nov. 26, 2019
Debt Instrument [Line Items]
Debt issuance costs		$ 659
Principal amount of debt issued			$ 40,000
Fixed interest rate			4.625%
Debt issuance costs	$ 617
SOFR
Debt Instrument [Line Items]
Interest rate margin	3.27%

DEPOSITS - Components (Details)

DEPOSITS - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Time less than $100,000	$ 309,408	$ 325,646
Time $100,000 through $250,000	201,996	278,940
Time $250,000 or more	127,032	93,775
Total	$ 638,436	$ 698,361

DEPOSITS - Maturities, Brokered

DEPOSITS - Maturities, Brokered, Reciprocal (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Time Deposits, Fiscal Year Maturity [Abstract]
Within 1 year	$ 525,701	$ 574,007
Over 1 year to 2 years	56,988	61,584
Over 2 years to 3 years	37,070	41,145
Over 3 years to 4 years	10,682	12,875
Over 4 years to 5 years	7,989	8,728
Over 5 years	6	22
Total	638,436	698,361
Brokered deposits	136,600	193,700
Reciprocal deposits	$ 140,700	$ 125,000

CAPITAL RATIOS AND SHAREHOLDE_3

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Actual and Required Capital Ratios (Details)	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2019
Actual
Total capital to risk-weighted assets, ratio	13.83	13.56
Common equity tier 1 capital to risk-weighted assets, ratio	10.55	10.49
Tier 1 capital to risk-weighted assets, ratio	11.34	11.28
Tier 1 capital to average assets, ratio	8.27	8.12
Capital Required For Capital Adequacy [Abstract]
Regulatory minimum to be well capitalized, Total capital to risk-weighted assets, ratio	10.50	10.50
Regulatory minimum to be well capitalized, Common equity tier 1 capital to risk-weighted assets, ratio	7.00%	7.00%
Regulatory minimum to be well capitalized, Tier 1 capital to risk-weighted assets, ratio	8.50	8.50
Regulatory minimum to be well capitalized, Tier 1 capital to average assets, ratio	5	5
Bank
Actual
Total capital to risk-weighted assets, ratio	13.62	13.27
Common equity tier 1 capital to risk-weighted assets, ratio	12.66	12.52
Tier 1 capital to risk-weighted assets, ratio	12.66	12.52
Tier 1 capital to average assets, ratio	9.23	9.02
Capital Required For Capital Adequacy [Abstract]
Regulatory minimum to be well capitalized, Total capital to risk-weighted assets, ratio	10.50	10.50
Regulatory minimum to be well capitalized, Common equity tier 1 capital to risk-weighted assets, ratio	7.00%	7.00%	7.00%
Regulatory minimum to be well capitalized, Tier 1 capital to risk-weighted assets, ratio	8.50	8.50	8.5
Regulatory minimum to be well capitalized, Tier 1 capital to average assets, ratio	5	5	10.5

CAPITAL RATIOS AND SHAREHOLDE_4

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 3,464	$ 11,016
Net unrealized gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	5,884	13,069
Income taxes related to items of accumulated other comprehensive income:	(1,374)	(3,046)
Accumulated other comprehensive income	4,508	10,021	$ 9,560	$ 5,549
Net unrealized gain (loss) on hedging derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	485	3,144
Income taxes related to items of accumulated other comprehensive income:	(113)	(733)
Accumulated other comprehensive income	374	2,413	(2,213)	(481)
Net unrealized loss on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(1,850)	(1,850)
Income taxes related to items of accumulated other comprehensive income:	432	432
Accumulated other comprehensive income	$ (1,418)	$ (1,418)	$ (1,157)	$ (1,157)

CAPITAL RATIOS AND SHAREHOLDE_5

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net unrealized gain (loss) arising during the period
Before Tax	$ (2,039)	$ (1,732)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	(283)	(64)
Other comprehensive income
Before Tax	(9,844)	2,975
Tax Effect	2,292	(696)
Total other comprehensive (loss) income	(7,552)	2,279
Net unrealized gain (loss) on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax	(7,185)	5,492
Tax Effect	1,672	(1,378)
Net of Tax	(5,513)	4,114
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax		135
Tax Effect		(32)
Net of Tax	0	103
Other comprehensive income
Before Tax	(7,185)	5,357
Tax Effect	1,672	(1,346)
Total other comprehensive (loss) income	(5,513)	4,011
Net unrealized gain (loss) on hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(2,659)	(2,382)
Tax Effect	620	650
Net of Tax	(2,039)	(1,732)
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0	0
Other comprehensive income
Before Tax	(2,659)	(2,382)
Tax Effect	620	650
Total other comprehensive (loss) income	(2,039)	(1,732)
Net unrealized loss on post-retirement plans
Net unrealized gain (loss) arising during the period
Net of Tax	0	0
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0	0
Other comprehensive income
Total other comprehensive (loss) income	$ 0	$ 0

CAPITAL RATIOS AND SHAREHOLDE_6

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of period	$ 11,016
Total other comprehensive (loss) income	(7,552)	$ 2,279
Balance at end of period	11,016		$ 3,464
Net unrealized gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of period	10,021	5,549
Other comprehensive gain (loss) before reclassifications	(5,513)	4,114
Less: amounts reclassified from accumulated other comprehensive income	0	103
Total other comprehensive (loss) income	(5,513)	4,011
Balance at end of period	10,021	5,549	4,508	$ 9,560
Net unrealized gain (loss) on hedging derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of period	2,413	(481)
Other comprehensive gain (loss) before reclassifications	(2,039)	(1,732)
Less: amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive (loss) income	(2,039)	(1,732)
Balance at end of period	2,413	(481)	374	(2,213)
Net unrealized loss on post-retirement plans
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of period	(1,418)	(1,157)
Other comprehensive gain (loss) before reclassifications	0	0
Less: amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive (loss) income	0	0
Balance at end of period	(1,418)	(1,157)	(1,418)	(1,157)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of period	11,016	3,911
Other comprehensive gain (loss) before reclassifications	(7,552)	2,382
Less: amounts reclassified from accumulated other comprehensive income	0	103
Total other comprehensive (loss) income	(7,552)	2,279
Balance at end of period	$ 11,016	$ 3,911	$ 3,464	$ 6,190

CAPITAL RATIOS AND SHAREHOLDE_7

CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Amounts Reclassified Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest income	$ 10,248	$ 8,421
Tax expense	(2,188)	(1,793)
Net realized gains and losses	$ 0
Available-for-sale Securities, Gross Realized Gains		146
Available-for-sale Securities, Gross Realized Losses		11
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest income		135
Tax expense		(32)
Net of tax		$ 103

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 9,480	$ 7,721
Average number of basic common shares outstanding (in shares)	14,933,554	15,558,132
Plus: dilutive effect of stock options and awards outstanding (in shares)	73,161	34,463
Average number of diluted common shares outstanding (in shares)	15,006,715	15,592,595
Earnings per share:
Basic (in dollars per share)	$ 0.63	$ 0.50
Diluted (in dollars per share)	$ 0.63	$ 0.50

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 960,461	$ 876,603
Fair Value Asset (Liability)	(1,434)	52
Interest rate swap on deposits
Derivative [Line Items]
Notional Amount	50,000	50,000	$ 25,000
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional Amount	$ 125,000	75,000
Weighted Average Maturity (in years)	4 years 3 months 18 days
Fair Value Asset (Liability)	$ (1,657)	(2,664)
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements
Derivative [Line Items]
Notional Amount	$ 75,000	$ 75,000
Weighted Average Maturity (in years)	3 years 9 months 18 days	4 years
Fair Value Asset (Liability)	$ (1,379)	$ (2,664)
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans
Derivative [Line Items]
Notional Amount	$ 50,000
Weighted Average Maturity (in years)	5 years
Fair Value Asset (Liability)	$ (278)
Designated as hedging instrument | Fair value hedges
Derivative [Line Items]
Notional Amount	$ 37,190	37,190
Weighted Average Maturity (in years)	8 years 3 months 18 days
Fair Value Asset (Liability)	$ 262	2,789
Designated as hedging instrument | Fair value hedges | Interest rate swap on deposits
Derivative [Line Items]
Notional Amount	$ 37,190	$ 37,190		$ 37,200
Weighted Average Maturity (in years)	8 years 3 months 18 days	8 years 7 months 6 days
Fair Value Asset (Liability)	$ 262	$ 2,789
Hedged Asset, Fair Value Hedge	39,070	40,209
Cumulative amount of fair value hedging adjustment in carrying amount	1,880	3,019
Designated as hedging instrument | Economic hedges
Derivative [Line Items]
Notional Amount	791,536	761,093
Fair Value Asset (Liability)	(85)	(95)
Designated as hedging instrument | Economic hedges | Forward sale commitments
Derivative [Line Items]
Notional Amount	$ 31,382	$ 50,629
Weighted Average Maturity (in years)	2 months 12 days	2 months 12 days
Fair Value Asset (Liability)	$ (85)	$ (95)
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | MNA counterparty
Derivative [Line Items]
Notional Amount	$ 260,792	$ 235,947
Weighted Average Maturity (in years)	6 years 9 months 18 days	6 years 9 months 18 days
Fair Value Asset (Liability)	$ (9,944)	$ (15,938)
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | RPA counterparty
Derivative [Line Items]
Notional Amount	$ 119,285	$ 119,285
Weighted Average Maturity (in years)	7 years 7 months 6 days	7 years 10 months 24 days
Fair Value Asset (Liability)	$ (5,482)	$ (9,957)
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | Customer
Derivative [Line Items]
Notional Amount	$ 380,077	$ 355,232
Weighted Average Maturity (in years)	7 years 1 month 6 days	7 years 1 month 6 days
Fair Value Asset (Liability)	$ 15,426	$ 25,895
Not designated as hedging instrument
Derivative [Line Items]
Notional Amount	$ 6,735	3,320
Weighted Average Maturity (in years)	2 months 12 days
Fair Value Asset (Liability)	$ 46	22
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Notional Amount	$ 6,735	$ 3,320
Weighted Average Maturity (in years)	2 months 12 days	1 month 6 days
Fair Value Asset (Liability)	$ 46	$ 22

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Amount of Gain (Loss) recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	$ (2,039)	$ (1,732)
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	(283)	(64)
Amount of Gain (Loss) Recognized in Income	(283)	(64)
Loss reclassification from AOCI to Earnings expected over the next 12 months	390
Designated as hedging instrument | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	774	(3,945)
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	(180)	(1)
Amount of Gain (Loss) Recognized in Income	(180)	(1)
Designated as hedging instrument | Cash flow hedges | Interest rate swap on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	987	(3,945)
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	(188)	(1)
Amount of Gain (Loss) Recognized in Income	(188)	(1)
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(213)
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	8
Amount of Gain (Loss) Recognized in Income	8
Designated as hedging instrument | Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(2,813)	2,213
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	(137)	(18)
Amount of Gain (Loss) Recognized in Income	(137)	(18)
Designated as hedging instrument | Fair value hedges | Interest rate swap on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(2,813)	2,213
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	(137)	(18)
Amount of Gain (Loss) Recognized in Income	(137)	(18)
Designated as hedging instrument | Economic hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	10	(11)
Amount of Gain (Loss) Recognized in Income	10	(11)
Designated as hedging instrument | Economic hedges | Forward sale commitments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	10	(11)
Amount of Gain (Loss) Recognized in Income	10	(11)
Not designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	24	(34)
Amount of Gain (Loss) Recognized in Income	24	(34)
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	24	(34)
Amount of Gain (Loss) Recognized in Income	$ 24	$ (34)

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)item	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)item	Apr. 30, 2020USD ($)item	Dec. 31, 2019USD ($)item	Nov. 30, 2019	Mar. 31, 2019
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 889		$ 103
Notional amount of interest rate swap	960,461	$ 876,603		$ 876,603
Interest rate swap on variable rate loans
Derivative [Line Items]
Variable rate loan assets	$ 50,000
Interest rate swap on variable rate loans | LIBOR less two days
Derivative [Line Items]
Variable interest rate	0.806%
Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item		2		2	1
Acquisition, conversion and other expenses		$ 3,900
Term of interest rate swap				5 years
Fixed rate of interest rate swap					0.59%		1.53%	2.46%
Notional amount of interest rate swap	$ 50,000	$ 50,000		$ 50,000	$ 25,000
Fixed interest rate, weighted average		2.46%		2.46%
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional amount of interest rate swap	125,000	$ 75,000		$ 75,000
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements
Derivative [Line Items]
Notional amount of interest rate swap	75,000	75,000		75,000
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans
Derivative [Line Items]
Notional amount of interest rate swap	50,000
Designated as hedging instrument | Fair value hedges
Derivative [Line Items]
Notional amount of interest rate swap	37,190	37,190		37,190
Designated as hedging instrument | Fair value hedges | Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item						8
Notional amount of interest rate swap	$ 37,190	$ 37,190		$ 37,190		$ 37,200
Fixed interest rate, weighted average						1.696%

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Cash Collateral Pledged	$ 12,700	$ 23,450
Net Amount	12,700	23,450
MNA counterparty
Derivative [Line Items]
Cash Collateral Pledged	12,700	23,450
Net Amount	12,700	23,450
Customer loan derivative liability
Derivative [Line Items]
Derivative liabilities	(15,426)	(25,895)
Customer loan derivative liability | MNA counterparty
Derivative [Line Items]
Derivative liabilities	(9,944)	(15,938)
Customer loan derivative liability | RPA counterparty
Derivative [Line Items]
Derivative liabilities	(5,482)	(9,957)
Customer loan derivative asset
Derivative [Line Items]
Derivative Assets	15,426	25,895
Customer loan derivative asset | MNA counterparty
Derivative [Line Items]
Derivative Assets	9,944	15,938
Customer loan derivative asset | RPA counterparty
Derivative [Line Items]
Derivative Assets	$ 5,482	$ 9,957

FAIR VALUE MEASUREMENTS - Measu

FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 626,403	$ 585,046
US Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	214,607	212,390
US Government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	76,185	85,632
Private label
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	47,541	19,709
Obligations of states and political subdivisions thereof
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	187,863	169,004
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	100,207	98,311
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Derivative assets	0
Derivative liabilities	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	626,403	585,046
Derivative assets	15,426	28,684
Derivative liabilities	(16,805)	(28,559)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Derivative assets	46	22
Derivative liabilities	(85)	(95)
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	15,472	28,706
Derivative liabilities	(16,890)	(28,654)
Recurring | US Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	214,607	212,390
Recurring | US Government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	76,185	85,632
Recurring | Private label
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	47,541	19,709
Recurring | Obligations of states and political subdivisions thereof
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	187,863	169,004
Recurring | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	100,207	98,311
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liabilities	0
Recurring | Level 1 | US Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 1 | US Government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 1 | Private label
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 1 | Obligations of states and political subdivisions thereof
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Recurring | Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	15,426	28,684
Derivative liabilities	(16,805)	(28,559)
Recurring | Level 2 | US Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	214,607	212,390
Recurring | Level 2 | US Government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	76,185	85,632
Recurring | Level 2 | Private label
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	47,541	19,709
Recurring | Level 2 | Obligations of states and political subdivisions thereof
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	187,863	169,004
Recurring | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	100,207	98,311
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	46	22
Derivative liabilities	(85)	$ (95)
Recurring | Level 3 | US Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 3 | US Government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 3 | Private label
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities available for sale	0
Recurring | Level 3 | Obligations of states and political subdivisions thereof
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Recurring | Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 0

FAIR VALUE MEASUREMENTS - Chang

FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Net Derivative Asset (Liability), Gain (Loss), Statement of Income [Extensible List]	Noninterest Income	Noninterest Income
Interest rate lock commitments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	$ 22	$ 59
Realized gain recognized in non-interest income	24	34
Ending balance	46	93
Forward Commitments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	(95)	(84)
Realized gain recognized in non-interest income	10	11
Ending balance	$ (85)	$ (73)

FAIR VALUE MEASUREMENTS - Unobs

FAIR VALUE MEASUREMENTS - Unobservable Inputs Recurring (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Derivative asset (liability), fair value	$ (1,434,000)	$ 52,000
Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Total	(39,000)	(73,000)
Recurring | Level 3 | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Derivative asset (liability), fair value	$ 46,000	22,000
Closing Ratio	90.00%
Origination Costs, per loan	$ 1,700
Recurring | Level 3 | Forward Commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Derivative asset (liability), fair value	$ (85,000)	$ (95,000)

FAIR VALUE MEASUREMENTS - Mea_2

FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) - Non-recurring - Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Assets
Individually evaluated loans	$ 10,556	$ 8,746
Capitalized servicing rights	4,693	3,605
Premises held for sale	971	962
Total	16,220	13,313
Total Gains (Losses)	(2,907)
Impaired loans
Assets
Total Gains (Losses)	(1,810)
Capitalized servicing rights
Assets
Total Gains (Losses)	(1,088)
Assets held for sale
Assets
Premises held for sale	971	$ 962
Total Gains (Losses)	$ (9)

FAIR VALUE MEASUREMENTS - Uno_2

FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - Non-recurring - Level 3 - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	$ 10,556	$ 8,746
Capitalized servicing rights	4,693	3,605
Premises held for sale	971	962
Total	16,220	13,313
Premises held for sale, carrying value	0
Fair value of collateral -appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	7,238	6,128
Discount cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	$ 3,318	$ 2,618
Impaired loans | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Loss severity	0.00%	0.00%
Appraised value	$ 0	$ 0
Cash flows	$ 7	$ 19
Discount rate	2.88%	3.50%
Impaired loans | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Loss severity	70.00%	70.00%
Appraised value	$ 1,792	$ 1,730
Cash flows	$ 953	$ 953
Discount rate	9.50%	9.50%
Capitalized servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Constant prepayment rate (CPR)	13.38%	18.53%
Discount rate	10.04%	10.05%
Assets held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Premises held for sale	$ 971	$ 962
Selling Costs	6.00%	6.00%
Assets held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Appraised value	$ 220	$ 220
Assets held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Appraised value	$ 386	$ 386

FAIR VALUE MEASUREMENTS - Fair

FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Securities available for sale	$ 626,403	$ 585,046
Level 1
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	0
FHLB stock	0
Loans held for sale	0
Net loans	0
Accrued interest receivable	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	0
Financial Liabilities
Securities sold under agreements to repurchase	0
FHLB advances	0
Derivative liabilities	0
Level 1 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 1 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 1 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Level 2
Financial Assets
Cash and cash equivalents	0
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	0
Net loans	0
Accrued interest receivable	3,668	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,426	28,684
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	271,622	252,698
Derivative liabilities	16,805	28,559
Level 2 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,274,973	2,122,222
Level 2 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	636,670	694,700
Level 2 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	57,133	57,091
Level 3
Financial Assets
Cash and cash equivalents	0
Securities available for sale	0
FHLB stock	0
Loans held for sale	10,148	24,163
Net loans	2,518,606	2,547,970
Accrued interest receivable	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	46	22
Financial Liabilities
Securities sold under agreements to repurchase	0
FHLB advances	0
Derivative liabilities	85	95
Level 3 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 3 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 3 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Carrying Amount
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	10,148	23,988
Net loans	2,527,411	2,543,803
Accrued interest receivable	3,688	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,472	28,706
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	267,934	248,283
Derivative liabilities	16,890	28,654
Carrying Amount | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,273,906	2,207,854
Carrying Amount | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	638,436	698,361
Carrying Amount | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	60,003	59,961
Total Fair Value
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	10,148	24,163
Net loans	2,518,606	2,547,970
Accrued interest receivable	3,668	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,472	28,706
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	271,622	252,698
Derivative liabilities	16,890	28,654
Total Fair Value | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,274,973	2,122,222
Total Fair Value | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	636,670	694,700
Total Fair Value | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	$ 57,133	$ 57,091

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 6,636	$ 6,481
Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	3,287	3,273
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	3,349	3,208
Trust management fees
Disaggregation of Revenue [Line Items]
Revenue	3,175	3,046
Financial services fees
Disaggregation of Revenue [Line Items]
Revenue	491	323
Interchange fees
Disaggregation of Revenue [Line Items]
Revenue	1,712	1,738
Customer deposit fees
Disaggregation of Revenue [Line Items]
Revenue	1,049	1,110
Other customer service fees
Disaggregation of Revenue [Line Items]
Revenue	$ 209	$ 264

REVENUE FROM CONTRACTS WITH C_4

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Balances from contracts with customers only:
Other Assets	$ 1,293	$ 1,121
Other Liabilities	$ 2,664	$ 2,785
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false]	true

LEASES - Assets and liabilities

LEASES - Assets and liabilities (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets		$ 10,056	$ 10,338
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other Asset	Other Asset
Operating lease liabilities		$ 10,368	$ 10,627
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Other Liabilities	Other Liabilities
Lease, Practical Expedients, Package [true false]	true

LEASES - Lease Term and Cost (D

LEASES - Lease Term and Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term (in years)	9 years 7 days		9 years 3 months 3 days
Weighted-average discount rate	3.15%		3.15%
Operating lease cost	$ 321	$ 234
Variable lease cost	81	144
Total lease cost	$ 402	$ 378

LEASES - Future Minimum Payment

LEASES - Future Minimum Payments for Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
March 31, 2022	$ 1,300
March 31, 2023	1,319
March 31, 2024	1,323
March 31, 2025	1,240
March 31, 2026	1,085
Thereafter	4,788
Total future minimum lease payments	11,055
Amounts representing interest	(687)
Operating lease liabilities	$ 10,368	$ 10,627