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BASIS OF PRESENTATION (Detail Textuals) - USD ($)	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Basis Of Presentation [Abstract]
Bank sold deposits	$ 3,200,000
Gain on sale of deposits	$ 70,000
Gain on sale of Longview branch land and building		$ 355,000

X

- Definition

Represents amount of bank deposits recognized a gain on sale .

+ References

No definition available.

+ Details

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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

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration