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LOANS AND ACL - Additional information (Details)
 6 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Deferred loan fees $ 4,300,000   $ 4,300,000
Discount on Loans receivable 1,100,000   1,200,000
Premiums on Loans receivable $ 1,700,000   1,700,000
Percentage of loans and extensions of credit outstanding 15.00%    
Loans pledged as collateral $ 1,054,764,000   $ 1,047,086,000
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    
Interest income foregone on non-accrual loans 23,000 $ 4,000 $ 16,000
Non-accrual loans with no ACL 716,000   94,000
Non-accrual loans with ACL 60,000   61,000
Non-accruals, Allowance 1,000   1,000
Total loans 1,070,191,000   1,062,460,000
30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 3,512,000   4,082,000
Fully Guaranteed SBA Or USDA Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,700,000   3,100,000
Assets pledged as collateral | FHLB and FRB Borrowing Arrangements      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral 755,900,000    
Assets pledged as collateral | Financing receivable | Commercial Business      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral 670,000   37,000
Assets pledged as collateral | Financing receivable | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral $ 46,000   $ 57,000