NEW ACCOUNTING PRONOUNCEMENTS (Details)	6 Months Ended
Sep. 30, 2021 loan
NEW ACCOUNTING PRONOUNCEMENTS
Number of loan modifications approved	0

Number of loan modifications approved for the COVID-19

No definition available.

Name:	rvsb_LoanModificationRelatedToCovid19
Namespace Prefix:	rvsb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration