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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) | 3 Months Ended
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Jun. 30, 2025 USD ($)
COMMITMENTS AND CONTINGENCIES |
Threshold limit for honoring of commitments | 45 days
Loans under warranty | $ 27,300,000
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