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DEPOSITS - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022
DEPOSITS
Time Deposits More Than 250,000	$ 40.3	$ 32.7

The aggregate amount of time deposit liabilities in denominations greater than $250,000.

No definition available.

Name:	rvsb_TimeDepositsMoreThan250000
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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