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BASIS OF PRESENTATION (Detail Textuals)	6 Months Ended
	Sep. 30, 2018 USD ($)
Basis Of Presentation [Abstract]
Bank sold deposits	$ 3,200,000
Gain on sale deposits	$ 70,000

X

- Definition

Represents amount of bank deposits recognized a gain on sale .

+ References

No definition available.

+ Details

Name:	rvsb_BankSoldDeposits
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	rvsb_BasisOfPresentationAbstract
Namespace Prefix:	rvsb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents amount of gain on sale of deposits.

+ References

No definition available.

+ Details

Name:	rvsb_GainOnSaleDeposits
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration