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JUNIOR SUBORDINATED DEBENTURES (Detail Textuals) | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) Quarter
Debt Instrument [Line Items] |  |
Maximum number of consecutive quarters for deferred payment of each debenture | Quarter |  | 20
Debentures issued to grantor trusts | $ 26,500,000 | $ 26,500,000
Common securities issued by grantor trusts | $ 836,000 | $ 836,000
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 |
Merchants Bancorp Statutory Trust I |  |
Debt Instrument [Line Items] |  |
Interest basis spread on variable rate | 3.10% |
Description of variable rate | three-month LIBOR |

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- 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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Balance Type: | debit
Period Type: | instant

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- 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
Balance Type: | credit
Period Type: | instant

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- Definition Represents the maximum number of consecutive quarters for deferred payment of each debenture. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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Period Type: | duration

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- 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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- 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. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |