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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Nov. 30, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares additional issued | 500 |  |  |  |  |
Additional Shares exercised | 500 |  |  |  |  |
Assets Held-in-trust |  |  | $ 1,300,000,000 | $ 1,300,000,000 |  |
Operating lease right-of-use assets |  |  | 7,907,000 | 8,782,000 |  |
Operating lease liabilities |  |  | 8,306,000 | 9,201,000 |  |
Loans and Leases Receivable, Gross, Total |  |  | 990,408,000 | 943,235,000 |  |
Loans Issued Under Coronavirus Aid, Relief, and Economic Security Act [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Total |  |  | $ 0 |  |  |
Core Deposit Intangibles | Merchants Bancorp |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated amortized period of Core Deposit Intangibles |  |  | 10 years |  |  |
Core Deposit Intangibles, gross |  |  | $ 1,400,000 | 1,400,000 |  |
Accumulated amortization |  |  | 868,000 | 744,000 |  |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2023 |  |  | 116,000 |  |  |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2024 |  |  | 108,000 |  |  |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2025 |  |  | 100,000 |  |  |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2026 |  |  | 93,000 |  |  |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2027 |  |  | $ 78,000 |  |  |
Building and improvements | Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 45 years |  |  |
Furniture and equipment | Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 3 years |  |  |
Furniture and equipment | Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 20 years |  |  |
Leasehold improvements | Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 15 years |  |  |
Leasehold improvements | Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  |  | 25 years |  |  |
Trust Company |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares issued |  | 1,500 |  |  |  |
Number of stock options exercised |  | 1,500 |  |  |  |
Non controlling Interest |  |  | $ 212,000 | 154,000 |  |
Net income attributable to the noncontrolling interest |  |  | $ 19,000 | $ 10,000 | $ 5,000 |
Trust Company | Riverview Community Bank |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 97.30% |  |  | 100.00%
Trust Company | Riverview Trust Company's President And Chief Executive Officer |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Noncontrolling interest percentage |  |  | 2.70% |  |  |

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