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LOANS AND ACL - Aggregate loans to officers and directors (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Loans to Officers and Directors
Beginning balance	$ 2,196	$ 2,847	$ 3,790
Principal repayments	(496)	(651)	(943)
Ending balance	$ 1,700	$ 2,196	$ 2,847

X

- Definition

Represents the balance of aggregate loans to officers and directors, all of which are current.

+ References

No definition available.

+ Details

Name:	rvsb_LoansToOfficersAndDirectors
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents repayments of loans to officers and directors during the indicated period.

+ References

No definition available.

+ Details

Name:	rvsb_LoansToOfficersAndDirectorsPrincipalRepayments
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableRelatedPartiesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration