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FAIR VALUE MEASUREMENTS: Level 3 inputs for financial instruments measured at fair value (Details 2) - Nonrecurring basis - Level 3 - Impaired loans - Appraised value or discounted cash flows - Adjustment for market conditions or discount rate	9 Months Ended
	Dec. 31, 2018	[1]
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans Measurement Input	5.25%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans Measurement Input	8.00%
[1] There were no adjustments to appraised values of impaired loans as of December 31, 2018 and March 31, 2018.

X

- 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

X

- 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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Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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