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JUNIOR SUBORDINATED DEBENTURES - Additional Information (Details) | 12 Months Ended |
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Mar. 31, 2023 USD ($) item | Mar. 31, 2022 USD ($)
JUNIOR SUBORDINATED DEBENTURES |  |
Maximum number of consecutive quarters for deferred payment of each debenture | item | 20 |
Debentures issued to grantor trusts | $ 26,900,000 | $ 26,800,000
Common securities issued by grantor trusts | $ 836,000 | $ 836,000
Riverview Bancorp Statutory Trust I |  |
JUNIOR SUBORDINATED DEBENTURES |  |
Description of variable rate | three-month LIBOR |
Interest basis spread on variable rate | 1.36% |
Riverview Bancorp Statutory Trust II |  |
JUNIOR SUBORDINATED DEBENTURES |  |
Description of variable rate | three-month LIBOR |
Interest basis spread on variable rate | 1.35% |
Merchants Bancorp Statutory Trust I |  |
JUNIOR SUBORDINATED DEBENTURES |  |
Description of variable rate | three-month LIBOR |
Interest basis spread on variable rate | 3.10% |

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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_
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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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- 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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- Definition Description of reference rate used for variable rate of debt instrument. + 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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- Details
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Balance Type: |
Period Type: |

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- Details
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