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v3.20.2

FAIR VALUE MEASUREMENTS - Level 3 inputs for financial instruments measured at fair value (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020
FAIR VALUE MEASUREMENTS |  |
Impaired loans | 8.00% | 8.00%

X
- Definition Value of input used to measure servicing asset. + References No definition available. + Details
Name: | rvsb_ImpairedLoansMeasurementInput
Namespace Prefix: | rvsb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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