v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
Mar. 31, 2025
Mar. 31, 2024
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