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REAL ESTATE OWNED: Activity in REO (Real Estate Owned) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Real Estate Owned |  |  |
Balance at beginning of year, net | $ 298 | $ 595 | $ 1,603
Additions | 0 | 0 | 298
Dispositions | 0 | (267) | (937)
Writedowns | 0 | (30) | (369)
Balance at end of year, net | $ 298 | $ 298 | $ 595

X
- Definition Represents additions to Real Estate Owned (REO) during the indicated time period. + References No definition available. + Details
Name: | rvsb_RealEstateOwnedAdditions
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the balance of Real Estate Owned (REO) as of the indicated date. + References No definition available. + Details
Name: | rvsb_RealEstateOwnedBalance
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents dispositions of Real Estate Owned (REO) during the indicated time period. + References No definition available. + Details
Name: | rvsb_RealEstateOwnedDispositions
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents writedowns of Real Estate Owned (REO) during the indicated time period. + References No definition available. + Details
Name: | rvsb_RealEstateOwnedWritedowns
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RealEstateOwnedValuationAllowanceRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration