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BASIS OF PRESENTATION (Detail Textuals) | 6 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Basis Of Presentation [Abstract] |
Bank sold deposits | $ 3,200,000
Gain on sale deposits | $ 70,000

X
- Definition Represents amount of bank deposits recognized a gain on sale . + References No definition available. + Details
Name: | rvsb_BankSoldDeposits
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | rvsb_BasisOfPresentationAbstract
Namespace Prefix: | rvsb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amount of gain on sale of deposits. + References No definition available. + Details
Name: | rvsb_GainOnSaleDeposits
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration