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DEPOSITS - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
DEPOSITS
Time deposits more than 250,000	$ 35.9	$ 10.5

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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