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JUNIOR SUBORDINATED DEBENTURES (Detail Textuals) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Debentures issued to grantor trusts	$ 22,700
Common securities issued by grantor trusts	$ 681	$ 681
Riverview Bancorp Statutory Trust I
Debt Instrument [Line Items]
Interest basis spread on variable rate	1.36%
Description of variable rate	three-month LIBOR
Riverview Bancorp Statutory Trust II
Debt Instrument [Line Items]
Interest basis spread on variable rate	1.35%
Description of variable rate	three-month LIBOR

X

- Definition

Amount of the common securities issued by the grantor trusts, and which were purchased by the Company, and included in prepaid expenses and other assets in the Consolidated Balance Sheets.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the debentures issued by the company to the grantor trusts.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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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.

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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