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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Summary Of Significant Accounting Policies [Line Items]
Assets Held-in-trust	$ 961,800,000	$ 890,600,000
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	1,100,000	$ 984,000
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

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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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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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