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LOANS AND ALLOWANCE FOR CREDIT LOSSES FOR LOANS - Additional information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
loan
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Deferred loan fees $ 4,200,000 $ 4,200,000   $ 4,700,000      
Discount On Loans Receivable 1,200,000 1,200,000   1,300,000      
Receivable with Imputed Interest, Premium 1,800,000 1,800,000   1,900,000      
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 1,029,757,000 $ 1,029,757,000   $ 1,008,649,000      
Percentage Of Loans And Extensions Of Credit Outstanding   15.00%          
Number of loans to one borrower over regulatory limit | loan   0   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) 15,352,000 15,352,000 $ 15,361,000 $ 15,364,000 $ 15,466,000 $ 15,346,000 $ 15,309,000
Non-accrual loans with no ACL 105,000 105,000          
Non-accrual loans with ACL 63,000 63,000          
Non-accruals, Allowance 1,000 1,000          
Interest income foregone on non-accrual loans   30,000 8,000 10,000      
Total loans 1,045,109,000 1,045,109,000   1,024,013,000      
30-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 5,558,000 5,558,000   1,779,000      
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 | 30-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 2,500,000 2,500,000   1,800,000      
Assets pledged as collateral | FHLB and FRB Borrowing Arrangements              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 738,800,000 738,800,000          
Assets pledged as collateral | Financing receivable | Commercial Business              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 42,000 42,000          
Assets pledged as collateral | Financing receivable | Commercial Real Estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 63,000 63,000          
Commercial and Industrial | Commercial Business              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 224,506,000 224,506,000   229,404,000      
Commercial and Industrial | Commercial Business | 30-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 2,455,000 2,455,000   1,778,000      
Commercial Real Estate Portfolio Segment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 931,842,000 931,842,000   925,907,000      
Commercial Real Estate Portfolio Segment | Commercial Business              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses (in dollars) 5,134,000 5,134,000 5,265,000 5,280,000 5,118,000 5,339,000 3,123,000
Total loans 224,506,000 224,506,000   229,404,000      
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) 7,219,000 7,219,000 7,279,000 7,391,000 7,137,000 7,138,000 8,894,000
Total loans 574,496,000 574,496,000   583,501,000      
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) 1,733,000 1,733,000 $ 1,595,000 1,584,000 $ 1,793,000 $ 1,604,000 1,127,000
Total loans 113,267,000 113,267,000   98,106,000      
Consumer | 30-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Total loans 981,000 981,000   1,000      
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 $ 97,760,000 $ 97,760,000   $ 96,366,000