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Fair Value Measurements (Details) - USD ($) $ in Thousands | 6 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Details |  |
Fair value measurements, transfer of assets across levels | $ 0 | $ 0

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- Definition Represents the monetary amount of Fair value measurements, transfer of assets across levels, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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