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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) | 12 Months Ended
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Mar. 31, 2021 USD ($)
COMMITMENTS AND CONTINGENCIES |
Threshold limit for honoring of commitments | 45 days
Commitments to sell | $ 0
Loans under warranty | 63,300,000
Allowance for FHLMC loans | $ 12,000

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
Name: | us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration