LOANS AND ALLOWANCE FOR CREDIT LOSSES - Reconciliation of the allowance for loan losses (Details) - USD ($)	3 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Reconciliation of the allowance for loan losses
Beginning balance	$ 15,309,000
Charge-offs	(11,000)
Recoveries	3,000
Ending balance	15,343,000
Reconciliation of the allowance for loan losses
Beginning balance	15,309,000	$ 14,523,000
Charge-offs		(6,000)
Recoveries		42,000
Ending balance		14,559,000
Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	42,000
Commercial Real Estate Portfolio Segment \| Commercial Business
Reconciliation of the allowance for loan losses
Beginning balance	3,123,000
Provision for (recapture of) loan losses	208,000
Ending balance	5,215,000
Reconciliation of the allowance for loan losses
Beginning balance	3,123,000	2,422,000
Provision for (recapture of) loan losses		73,000
Ending balance		2,495,000
Commercial Real Estate Portfolio Segment \| Commercial Business \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	1,884,000
Commercial Real Estate Portfolio Segment \| Commercial Real Estate
Reconciliation of the allowance for loan losses
Beginning balance	8,894,000
Provision for (recapture of) loan losses	(195,000)
Ending balance	7,205,000
Reconciliation of the allowance for loan losses
Beginning balance	8,894,000	9,037,000
Provision for (recapture of) loan losses		(495,000)
Ending balance		8,542,000
Commercial Real Estate Portfolio Segment \| Commercial Real Estate \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	(1,494,000)
Commercial Real Estate Portfolio Segment \| Land
Reconciliation of the allowance for loan losses
Beginning balance	93,000
Provision for (recapture of) loan losses	(10,000)
Ending balance	123,000
Reconciliation of the allowance for loan losses
Beginning balance	93,000	168,000
Provision for (recapture of) loan losses		(19,000)
Ending balance		149,000
Commercial Real Estate Portfolio Segment \| Land \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	40,000
Commercial Real Estate Portfolio Segment \| Multi-Family
Reconciliation of the allowance for loan losses
Beginning balance	798,000
Provision for (recapture of) loan losses	(13,000)
Ending balance	293,000
Reconciliation of the allowance for loan losses
Beginning balance	798,000	845,000
Provision for (recapture of) loan losses		17,000
Ending balance		862,000
Commercial Real Estate Portfolio Segment \| Multi-Family \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	(492,000)
Commercial Real Estate Portfolio Segment \| Real Estate Construction
Reconciliation of the allowance for loan losses
Beginning balance	764,000
Provision for (recapture of) loan losses	(65,000)
Ending balance	830,000
Reconciliation of the allowance for loan losses
Beginning balance	764,000	393,000
Provision for (recapture of) loan losses		125,000
Ending balance		518,000
Commercial Real Estate Portfolio Segment \| Real Estate Construction \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	131,000
Consumer
Reconciliation of the allowance for loan losses
Beginning balance	1,127,000
Provision for (recapture of) loan losses	75,000
Charge-offs	(11,000)
Recoveries	3,000
Ending balance	1,677,000
Reconciliation of the allowance for loan losses
Beginning balance	1,127,000	943,000
Provision for (recapture of) loan losses		257,000
Charge-offs		(6,000)
Recoveries		42,000
Ending balance		1,236,000
Consumer \| ASU 2016-13
Reconciliation of the allowance for loan losses
Recoveries	0
Consumer \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	483,000
Unallocated
Reconciliation of the allowance for loan losses
Beginning balance	510,000
Reconciliation of the allowance for loan losses
Beginning balance	510,000	715,000
Provision for (recapture of) loan losses		42,000
Ending balance		$ 757,000
Unallocated \| Adjustment \| ASU 2016-13
Reconciliation of the allowance for loan losses
Beginning balance	$ (510,000)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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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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-Publisher FASB
-Name Accounting Standards Codification
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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
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Amount of expense related to estimated loss from loan and lease transactions.

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