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LOANS RECEIVABLE - Aggregate loans to officers and directors (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Loans to Officers and Directors
Beginning balance	$ 625	$ 778	$ 981
Originations	8,174	977	359
Principal repayments	(3,491)	(1,130)	(562)
Ending balance	$ 5,308	$ 625	$ 778

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- 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

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- Definition

Represents loans to officers and directors, originated during the indicated period.

+ References

No definition available.

+ Details

Name:	rvsb_LoansToOfficersAndDirectorsOriginations
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- 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

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- Definition

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

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No definition available.

+ Details

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