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FEDERAL HOME LOAN BANK ADVANCES - Additional Information (Details) $ in Millions	12 Months Ended
	Mar. 31, 2020 USD ($)
FEDERAL HOME LOAN BANK ADVANCES
Percentages of federal home loan banks credit line facility	45.00%
Additional borrowing from FHlB	$ 235.9
Loans pledged as collateral to FHIB	$ 397.2

X

- Definition

Represents percentages related to credit line facility is equal to 45% of total assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount related to loans pledged as collateral to FHIB.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

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- Definition

Amount of cash inflow from Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration