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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

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

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

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

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

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