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NEW ACCOUNTING PRONOUNCEMENTS (Details) - COVID 19 | 3 Months Ended
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Jun. 30, 2020 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |
Number of loan modifications approved | 141
Outstanding loan balance, net of deferred fees | $ 171,700,000

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- Definition Number of loan modifications approved for the COVID-19 + References No definition available. + Details
Name: | rvsb_LoanModificationRelatedToCovid19
Namespace Prefix: | rvsb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of Short-term loan modifications payment deferral COVID-19 response. + References No definition available. + Details
Name: | rvsb_ShortTermLoanModificationsPaymentDeferralCovid19Response
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnusualOrInfrequentItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=rvsb_Covid19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |