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DEPOSITS - Summary of Deposit Accounts (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
DEPOSITS
Total	$ 990,448	$ 925,068
Non-interest-bearing
DEPOSITS
Total	271,031	284,854
Interest-bearing checking
DEPOSITS
Total	187,798	183,388
Money market
DEPOSITS
Total	169,798	233,317
Savings accounts
DEPOSITS
Total	226,880	137,503
Certificates of deposit
DEPOSITS
Total	$ 134,941	$ 86,006

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- Definition

Represents the balance of deposit accounts, as of the indicated date.

+ References

No definition available.

+ Details

Name:	rvsb_DepositAccountsBalance
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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

Name:	rvsb_DepositLineItems
Namespace Prefix:	rvsb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	rvsb_DepositsTypeAxis=rvsb_NonInterestBearingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rvsb_DepositsTypeAxis=rvsb_InterestCheckingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rvsb_DepositsTypeAxis=rvsb_MoneyMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rvsb_DepositsTypeAxis=rvsb_SavingsAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rvsb_DepositsTypeAxis=rvsb_CertificatesOfDeposit1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: