v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Summary Of Significant Accounting Policies [Line Items]        
Allowance for credit losses (in dollars) $ 15,248,000 $ 15,374,000 $ 15,364,000 $ 15,309,000
Asset, Held-in-Trust 908,100,000 877,900,000    
ASU 2016-13 | Adjustment        
Summary Of Significant Accounting Policies [Line Items]        
Allowance for credit losses (in dollars)     $ 42,000 $ 42,000
Merchants Bancorp        
Summary Of Significant Accounting Policies [Line Items]        
Core Deposit Intangibles, gross $ 1,400,000 1,400,000    
Core Deposit Intangibles | Merchants Bancorp        
Summary Of Significant Accounting Policies [Line Items]        
Estimated amortized period of Core Deposit Intangibles 10 years      
Accumulated amortization $ 1,300,000 $ 1,200,000    
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2027 $ 77,000      
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