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EMPLOYEE BENEFIT PLANS (Detail Textuals 1)	12 Months Ended
	Mar. 31, 2019 USD ($) service shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Employee Stock Ownership Plan [Abstract]
Number of hours of service | service	1,000
Employee Stock Ownership Plan compensation expense | $		$ 148,000	$ 143,000
Bank purchased common stock on open market and contributed such shares to ESOP | shares	25,000
Employee benefits expense | $	$ 197,000
Shares held by the ESOP | shares	441,966

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- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Represents number hours of services.

+ References

No definition available.

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- Definition

Represents number of share related to esop.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvsb_
Data Type:	xbrli:sharesItemType
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- Definition

Amount of expense for employee benefit and equity-based compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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- Definition

Number of allocated shares held by the Employee Stock Option Plan at balance sheet date. Allocated shares are shares that have been assigned to individual participant accounts based on a known formula.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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