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FAIR VALUE MEASUREMENTS - Level 3 inputs for financial instruments measured at fair value (Details) - Nonrecurring basis - Level 3 - Impaired loans - Discounted cash flows - Discount rate | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019
Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans Measurement Input | [1] | 6.25% | 6.25%
Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired Loans Measurement Input | [1] | 8.00% | 8.00%
[1] | There were no adjustments to appraised values of impaired loans as of September 30, 2019 and March 31, 2019.

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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- Details
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- Details
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