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DEPOSITS (Detail Textuals) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Deposits [Abstract] |  |
Time deposits more than 250,000 | $ 10.8 | $ 12.1

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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