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DEPOSITS: Summary of Deposit Accounts (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deposit [Line Items]
Total	$ 925,068	$ 995,691
Non-interest-bearing
Deposit [Line Items]
Total	284,854	278,966
Interest-bearing checking
Deposit [Line Items]
Total	183,388	192,989
Money market
Deposit [Line Items]
Total	233,317	265,661
Savings accounts
Deposit [Line Items]
Total	137,503	134,931
Certificates of deposit
Deposit [Line Items]
Total	$ 86,006	$ 123,144

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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

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- 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: