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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

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- References No definition available. + Details
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- 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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