LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional information (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan	Mar. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan fees	$ 4,600,000	$ 4,700,000		$ 4,600,000
Discount On Loans Receivable	1,200,000	1,300,000		1,200,000
Premiums On Loans Receivable.	1,900,000	1,900,000		1,900,000
Collateral dependent loans	$ 1,029,701,000	1,008,649,000		$ 1,029,701,000
Percentage Of Loans And Extensions Of Credit Outstanding	15.00%
Number of loans to one borrower over regulatory limit | loan				0
Financing receivable, excluding accrued interest, modified in period, amount	$ 0
Financing receivable, excluding accrued interest, modified, subsequent default	0
Allowance for credit losses (in dollars)	15,364,000	15,364,000	$ 15,343,000	$ 15,364,000	$ 15,309,000
Non-accrual loans with no ACL	126,000			126,000
Non-accrual loans with ACL	34,000			34,000
Non-accruals, Allowance	1,000			1,000
Interest income foregone on non-accrual loans	2,000	10,000	3,000
Total loans	1,045,065,000	1,024,013,000		1,045,065,000
30 To 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	10,231,000	1,779,000		10,231,000
Adjustment | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)					42,000
Fully Guaranteed SBA Or USDA Loans | 30 To 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	722,000			722,000
Asset Pledged as Collateral | FHLB and FRB Borrowing Arrangements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral dependent loans	784,000,000.0			784,000,000.0
Asset Pledged as Collateral | Financing receivable | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral dependent loans	53,000			53,000
Asset Pledged as Collateral | Financing receivable | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral dependent loans	73,000			73,000
Commercial and Industrial | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	238,493,000	229,404,000		238,493,000
Commercial and Industrial | Commercial Business | 30 To 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,811,000	1,778,000		1,811,000
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	942,166,000	925,907,000		942,166,000
Commercial Real Estate Portfolio Segment | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)	5,141,000	5,280,000	5,215,000	5,141,000	3,123,000
Total loans	238,493,000	229,404,000		238,493,000
Commercial Real Estate Portfolio Segment | Commercial Business | Adjustment | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)					1,884,000
Commercial Real Estate Portfolio Segment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)	7,303,000	7,391,000	7,205,000	7,303,000	8,894,000
Total loans	578,115,000	583,501,000		578,115,000
Commercial Real Estate Portfolio Segment | Commercial Real Estate | 30 To 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,409,000			8,409,000
Commercial Real Estate Portfolio Segment | Commercial Real Estate | Adjustment | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)					(1,494,000)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)	1,675,000	1,584,000	$ 1,677,000	1,675,000	1,127,000
Total loans	102,899,000	98,106,000		102,899,000
Consumer | 30 To 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,000	1,000		11,000
Consumer | Adjustment | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses (in dollars)					$ 483,000
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 96,083,000	$ 96,366,000		$ 96,083,000