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LOANS - Additional information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
LOANS
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	$ 3,735,000		$ 4,427,000
Recorded investment - with allowance	6,528,000		6,540,000
Specific allowances	730,000		740,000
Loans receivable	1,538,190,000		1,564,849,000
Allowance for Loan losses	14,271,000	$ 11,661,000	13,537,000	$ 11,385,000
Interest and fees	18,549,000	19,491,000
Financing receivable charge-offs	180,000	11,000
Provision (credit) for loan losses	891,000	259,000
Increase (decrease) in provision for loan losses	(632,000)
Amount of net charge related to specific loans	147,000	182,000
Amount of net increase (decrease) in specific allowances on loans	10,000	199,000
Amount of net charge offs related to a specific loan	157,000
Amount of increase (decrease) in the provision for loan losses from collectively determined portion of allowance	748,000
Amount of increase (decrease) in the provision for loan losses from unallocated portion of allowance	4,000	92,000
Recorded Investment	12,005,000		15,734,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	0		0
Income From Repayments Of PCI Loans In Excess Of Carrying Amounts	1,398,000
Decrease in the collectively determined portion of the allowance for loan losses		15,000
Financing Receivable Allowance For Credit Losses Recovery Setoff Against Allowances Provided		17,000
Purchased Credit Impaired
LOANS
Loans receivable	3,983,000		6,558,000
Loans Modified, Recorded Investment	3,983,000		6,558,000
Small Business Administration - Paycheck Protection Program
LOANS
Interest and fees	575,000	1,998,000
Paycheck Protection Program - 1st Draw
LOANS
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	18,000
Contractual principal balances	905,000
Recorded Investment	887,000
Paycheck Protection Program - 2nd Draw
LOANS
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	357,000
Contractual principal balances	11,847,000
Recorded Investment	11,490,000
Unfunded Loan Commitment
LOANS
Allowance for Loan losses	0		0
Commercial
LOANS
Loans receivable	960,143,000		978,371,000
Allowance for Loan losses	8,922,000	6,564,000	8,293,000	6,308,000
Financing receivable charge-offs	150,000	0
Provision (credit) for loan losses	779,000	242,000
Commercial | Purchased Credit Impaired
LOANS
Loans receivable	3,913,000		6,485,000
Commercial | Paycheck Protection Program - 1st Draw
LOANS
Loans receivable	887,000		1,356,000
Allowance for Loan losses	0		0
Commercial | Paycheck Protection Program - 1st Draw | Purchased Credit Impaired
LOANS
Loans receivable	0		0
Commercial | Paycheck Protection Program - 2nd Draw
LOANS
Loans receivable	11,490,000		25,508,000
Allowance for Loan losses	0		0
Commercial | Paycheck Protection Program - 2nd Draw | Purchased Credit Impaired
LOANS
Loans receivable	0		0
Commercial | Commercial and industrial
LOANS
Recorded investment - with allowance	72,000		72,000
Specific allowances	72,000		72,000
Loans receivable	159,793,000		159,073,000
Allowance for Loan losses	2,841,000	2,187,000	2,723,000	2,245,000
Financing receivable charge-offs	150,000	0
Provision (credit) for loan losses	268,000	(72,000)
Commercial | Commercial and industrial | Purchased Credit Impaired
LOANS
Loans receivable	39,000		763,000
Commercial | Real estate loan
LOANS
Recorded investment - with allowance	6,456,000		6,468,000
Specific allowances	658,000		668,000
Loans receivable	585,677,000		569,840,000
Allowance for Loan losses	5,017,000	3,350,000	4,405,000	3,051,000
Financing receivable charge-offs	0	0
Provision (credit) for loan losses	612,000	299,000
Commercial | Real estate loan | Purchased Credit Impaired
LOANS
Loans receivable	3,874,000		4,144,000
Unallocated
LOANS
Allowance for Loan losses	667,000	677,000	671,000	585,000
Financing receivable charge-offs	0	0
Provision (credit) for loan losses	(4,000)	92,000
Residential mortgage
LOANS
Loans receivable	560,285,000		569,346,000
Allowance for Loan losses	4,445,000	4,200,000	4,338,000	$ 4,253,000
Financing receivable charge-offs	0	0
Provision (credit) for loan losses	91,000	$ (55,000)
Residential mortgage | Purchased Credit Impaired
LOANS
Loans receivable	$ 70,000		$ 73,000

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