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Fair Value of Financial Instruments - Summary Of Carrying Amounts And Estimated Fair Values By Fair Value Hierarchy Of Certain Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Carrying Amount    
Financial assets:    
Loans, net $ 416,797 $ 396,756
Financial liabilities:    
Interest-bearing deposits 344,210 351,704
Estimated Fair Value    
Financial assets:    
Loans, net 404,325 380,967
Financial liabilities:    
Interest-bearing deposits 306,371 308,114
Level 2    
Financial liabilities:    
Interest-bearing deposits 306,371 308,114
Level 3    
Financial assets:    
Loans, net $ 404,325 $ 380,967