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NEW ACCOUNTING PRONOUNCEMENTS (Details) - COVID 19	9 Months Ended
	Dec. 31, 2020 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Number of loan modifications approved	8
Outstanding loan balance, net of deferred fees	$ 26,600,000

X

- Definition

Number of loan modifications approved for the COVID-19

+ References

No definition available.

+ Details

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

X

- Definition

Amount of Short-term loan modifications payment deferral COVID-19 response.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=rvsb_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: