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v3.25.1

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