v3.25.4
Borrowings - Summary of Borrowings (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2025
Line of Credit Facility [Line Items]          
Outstanding advances $ 0   $ 0   $ 0
Total borrowing capacity 47,000,000   47,000,000   40,500,000
Federal Reserve Bank Advances          
Line of Credit Facility [Line Items]          
Outstanding advances at any month-end during the period 0 $ 0 0 $ 0  
Outstanding advances 0   0   0
Private Banker's Bank          
Line of Credit Facility [Line Items]          
Outstanding advances at any month-end during the period 0 0   459,000  
Federal Home Loan Bank Of Topeka and Private Banker's Bank          
Line of Credit Facility [Line Items]          
Average balance outstanding 2,085,000 42,000 1,765,000 1,064,000  
Total maximum amount outstanding at any month-end during the period $ 0 $ 0 $ 8,500,000 $ 8,459,000  
Average interest rate during the period 4.22% 4.83% 4.46% 5.44%  
Additional borrowing capacity $ 2,025,000   $ 2,025,000   45,534,000
Total borrowing capacity 62,025,000   62,025,000   45,534,000
FHLB of Topeka          
Line of Credit Facility [Line Items]          
Outstanding advances at any month-end during the period 0 $ 0 8,500,000 $ 8,000,000  
Outstanding advances $ 0   $ 0   $ 0