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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, 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 | $ 1,200,000,000 |
Operating lease liabilities |  |  | 9,201,000 |  |
Loans and Leases Receivable, Gross, Total |  |  | 943,235,000 | 911,509,000 |
Loans Issued Under Coronavirus Aid, Relief, and Economic Security Act [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross, Total |  |  | $ 18,100,000 |  |
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 |  |  | $ 1,360,000 | 1,360,000 |
Accumulated amortization |  |  | 744,000 | 604,000 |
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2022 |  |  | 125,000 |  |
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, thereafter |  |  | $ 77,000 |  |
Building and improvements |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives |  |  | up to 45 years |  |
Furniture and equipment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives |  |  | 3 to 20 years |  |
Leasehold improvements |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives |  |  | 15 to 25 years, or estimated lease term if shorter |  |
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 |  |  | $ 154,000 | 107,000 |
Net income attributable to the noncontrolling interest |  |  | $ 10,000 | $ 5,000 |
Trust Company | Riverview Community Bank |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership percentage |  |  | 97.80% |  | 100.00%

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