COMMITMENTS AND CONTINGENCIES - Additional Information (Details)	3 Months Ended
Jun. 30, 2021 USD ($)
COMMITMENTS AND CONTINGENCIES
Threshold limit for honoring of commitments	45 days
Loans under warranty	$ 56,700,000
Allowance for FHLMC loans	$ 12,000

Loans reflecting that if the underlying assets do not conform to the specifications, the Bank may have an obligation to repurchase the assets or indemnify the purchaser against loss.

No definition available.

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