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Fair Value Measurements: Schedule of Assets measured at fair value on a non-recurring basis (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Mar. 31, 2016
--- | --- | ---
Assets, Fair Value Disclosure, Nonrecurring | $ 1,339 | $ 1,736
Impaired loans |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,084 | 1,092
Real estate owned |  |
Assets, Fair Value Disclosure, Nonrecurring | 255 | 644
Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,339 | 1,092
Fair Value, Inputs, Level 3 | Impaired loans |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,084 | 1,092
Fair Value, Inputs, Level 3 | Real estate owned |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 255 | $ 644

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | rvsb_NonRecurringAssetsAxis=rvsb_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rvsb_NonRecurringAssetsAxis=rvsb_RealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |