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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) | Mar. 31, 2025 | Mar. 31, 2024
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Summary Of Significant Accounting Policies [Line Items] |  |
Asset, Held-in-Trust | $ 877,900,000 | $ 961,800,000
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 | $ 1,400,000 | 1,400,000
Accumulated amortization | 1,200,000 | $ 1,100,000
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 |

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