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FAIR VALUE MEASUREMENTS - Level 3 inputs for financial instruments measured at fair value (Details)	6 Months Ended	12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020
FAIR VALUE MEASUREMENTS
Impaired loans	8.00%	8.00%

X

- Definition

Value of input used to measure servicing asset.

+ References

No definition available.

+ Details

Name:	rvsb_ImpairedLoansMeasurementInput
Namespace Prefix:	rvsb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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