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Junior Subordinated Debentures (Details)	Sep. 30, 2016 USD ($)
Details
Debentures issued to grantor trusts	$ 22,700,000
Common securities issued by grantor trusts	$ 681,000

X

- Definition

Amount of the common securities issued by the grantor trusts, and which were purchased by the Company, and included in prepaid expenses and other assets in the Consolidated Balance Sheets.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of the debentures issued by the company to the grantor trusts.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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