LOANS AND ACL - Additional information (Details)	3 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Mar. 31, 2026 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan fees	$ 4,200,000		$ 4,300,000
Discount on Loans receivable	988,000		1,000,000
Premiums on Loans receivable	1,500,000		1,600,000
Loans pledged as collateral	$ 1,077,963,000		$ 1,077,236,000
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, subsequent default	$ 0
Interest income foregone on non-accrual loans	148,000	$ 4,000
Non-accrual loans with no ACL	8,600,000		$ 7,500,000
Non-accrual loans with ACL	119,000		226,000
Non-accruals, Allowance	3,000		5,000
Assets pledged as collateral \| FHLB and FRB Borrowing Arrangements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	739,700,000
Assets pledged as collateral \| Financing receivable \| Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	487,000		519,000
Assets pledged as collateral \| Financing receivable \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	8,100,000		$ 7
Commercial Real Estate Portfolio Segment \| Commercial Real Estate \| Payment deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 3,000,000
Financing receivable, excluding accrued interest, modified in period, percentage	1.00%
Financing receivable, modified period	6 months

Amount of deferred interest and fee income, unamortized costs incurred to originate loans unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans covered under loss sharing agreements.

No definition available.