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COMMITMENTS AND CONTINGENCIES - Additional Information (Details)	6 Months Ended
	Sep. 30, 2020 USD ($)
COMMITMENTS AND CONTINGENCIES
Threshold limit for honoring of commitments	45 days
Loans under warranty	$ 82,900,000
Allowance for FHLMC loans	$ 12,000

X

- Definition

Represents amount of Allowance for FHLMC loans Federal Home Loan Mortgage Corporation.

+ References

No definition available.

+ Details

Name:	rvsb_AllowanceForFederalHomeLoanMortgageCorporationLoans
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Loans reflecting that if the underlying assets do not conform to the specifications, the Bank may have an obligation to repurchase the assets or indemnify the purchaser against loss.

+ References

No definition available.

+ Details

Name:	rvsb_LoansUnderWarranty
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represent the threshold limit for honoring of commitments.

+ References

No definition available.

+ Details

Name:	rvsb_ThresholdLimitForHonoringOfCommitments
Namespace Prefix:	rvsb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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