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PREMISES AND EQUIPMENT (Detail Textuals) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2010 USD ($) Branch | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Property, Plant and Equipment [Abstract] |  |  |  |
Depreciation and amortization expense |  | $ 1,200,000 | $ 1,100,000 | $ 1,300,000
Amortization expense |  | 77,000 | 77,000 | 89,000
Accumulated amortization for capital lease |  | 1,300,000 | 1,200,000 |
Number of branch location sold | Branch | 2 |  |  |
Deferred gain loss on cancellation of lease | $ 2,100,000 | 857,000 |  |
Rent expense |  | $ 2,100,000 | $ 1,800,000 | $ 1,800,000

X
- Definition Represents amount of Deferred gain loss on cancellation of lease. + References No definition available. + Details
Name: | rvsb_DeferredGainLossOnCancellationOfLease
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents number of branch location sold. + References No definition available. + Details
Name: | rvsb_NumberOfBranchLocationSold
Namespace Prefix: | rvsb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the accumulated amortization for Premises and Equipment Capital Leases as of the indicated date. + References No definition available. + Details
Name: | rvsb_PremisesAndEquipmentAccumulatedAmortizationForCapitalLease
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amortization expense for Premises and Equipment during the indicated period. + References No definition available. + Details
Name: | rvsb_PremisesAndEquipmentAmortizationExpense
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the depreciation expense for Premises and Equipment during the indicated period. + References No definition available. + Details
Name: | rvsb_PremisesAndEquipmentDepreciationExpense
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration