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v3.21.2

LOANS RECEIVABLE - Aggregate loans to officers and directors (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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