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DEPOSITS - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020
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DEPOSITS |  |
Time deposits more than 250,000 | $ 31.7 | $ 35.9

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- Definition The aggregate amount of time deposit liabilities in denominations of $250,000 or more. + References No definition available. + Details
Name: | rvsb_TimeDepositsMoreThan250000
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration