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RESTRICTED ASSETS (Details)	Mar. 31, 2021 USD ($)
Other Restricted Assets [Abstract]
Minimum reserve balance	$ 0

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- Definition

Represents the amount of reserve balances either on hand or on deposit with the Federal Reserve Bank of San Francisco ("FRB"), based on a percentage of deposits as of the date indicated, as required by regulations of the Board of Governors of the Federal Reserve System ("Federal Reserve Board").

+ References

No definition available.

+ Details

Name:	rvsb_MinimumReserveBalance
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_OtherRestrictedAssetsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration