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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:

X

- Details

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