LOANS AND ACL - Reconciliation of the allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Reconciliation of the allowance for loan losses
Beginning balance	$ 15,364	$ 15,309
Provision for (recapture of) loan losses	100
Charge-offs	(123)	(13)
Recoveries	33	26
Ending balance	15,374	15,364	$ 15,309
Reconciliation of the allowance for loan losses before ASU
Beginning balance		15,309	14,523
Provision for (recapture of) loan losses			750
Charge-offs			(17)
Recoveries			53
Ending balance			15,309
Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	42	42
Ending balance		42	42
Commercial Real Estate Portfolio Segment \| Commercial Business
Reconciliation of the allowance for loan losses
Beginning balance	5,280	3,123
Provision for (recapture of) loan losses	(248)	273
Recoveries	1
Ending balance	5,033	5,280	3,123
Reconciliation of the allowance for loan losses before ASU
Beginning balance		3,123	2,422
Provision for (recapture of) loan losses			701
Ending balance			3,123
Commercial Real Estate Portfolio Segment \| Commercial Business \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		1,884
Ending balance			1,884
Commercial Real Estate Portfolio Segment \| Commercial Real Estate
Reconciliation of the allowance for loan losses
Beginning balance	7,391	8,894
Provision for (recapture of) loan losses	181	(9)
Charge-offs	(80)
Ending balance	7,492	7,391	8,894
Reconciliation of the allowance for loan losses before ASU
Beginning balance		8,894	9,037
Provision for (recapture of) loan losses			(143)
Ending balance			8,894
Commercial Real Estate Portfolio Segment \| Commercial Real Estate \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		(1,494)
Ending balance			(1,494)
Commercial Real Estate Portfolio Segment \| Land
Reconciliation of the allowance for loan losses
Beginning balance	106	93
Provision for (recapture of) loan losses	(23)	(27)
Ending balance	83	106	93
Reconciliation of the allowance for loan losses before ASU
Beginning balance		93	168
Provision for (recapture of) loan losses			(75)
Ending balance			93
Commercial Real Estate Portfolio Segment \| Land \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		40
Ending balance			40
Commercial Real Estate Portfolio Segment \| Multi-Family
Reconciliation of the allowance for loan losses
Beginning balance	367	798
Provision for (recapture of) loan losses	77	61
Ending balance	444	367	798
Reconciliation of the allowance for loan losses before ASU
Beginning balance		798	845
Provision for (recapture of) loan losses			(47)
Ending balance			798
Commercial Real Estate Portfolio Segment \| Multi-Family \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		(492)
Ending balance			(492)
Commercial Real Estate Portfolio Segment \| Real Estate Construction
Reconciliation of the allowance for loan losses
Beginning balance	636	764
Provision for (recapture of) loan losses	(156)	(259)
Ending balance	480	636	764
Reconciliation of the allowance for loan losses before ASU
Beginning balance		764	393
Provision for (recapture of) loan losses			371
Ending balance			764
Commercial Real Estate Portfolio Segment \| Real Estate Construction \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		131
Ending balance			131
Consumer
Reconciliation of the allowance for loan losses
Beginning balance	1,584	1,127
Provision for (recapture of) loan losses	269	(39)
Charge-offs	(43)	(13)
Recoveries	32	26
Ending balance	$ 1,842	1,584	1,127
Reconciliation of the allowance for loan losses before ASU
Beginning balance		1,127	943
Provision for (recapture of) loan losses			148
Charge-offs			(17)
Recoveries			53
Ending balance			1,127
Consumer \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		483
Ending balance			483
Unallocated
Reconciliation of the allowance for loan losses
Beginning balance		510
Ending balance			510
Reconciliation of the allowance for loan losses before ASU
Beginning balance		510	715
Provision for (recapture of) loan losses			(205)
Ending balance			510
Unallocated \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance		$ (510)
Ending balance			$ (510)

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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