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Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Details
Fair value measurements, transfer of assets across levels	$ 0	$ 0

X

- Definition

Represents the monetary amount of Fair value measurements, transfer of assets across levels, during the indicated time period.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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