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JUNIOR SUBORDINATED DEBENTURES - Additional Information (Details)	6 Months Ended
	Sep. 30, 2022 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	0.0136%
Riverview Bancorp Statutory Trust II
JUNIOR SUBORDINATED DEBENTURES
Description of variable rate	three-month LIBOR
Interest basis spread on variable rate	0.0135%
Merchants Bancorp Statutory Trust I
JUNIOR SUBORDINATED DEBENTURES
Description of variable rate	three-month LIBOR
Interest basis spread on variable rate	0.031%

X

- 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.

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- Definition

The amount of the debentures issued by the company to the grantor trusts.

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X

- Definition

Represents the maximum number of consecutive quarters for deferred payment of each debenture.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Description of reference rate used for variable rate of debt instrument.

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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.

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