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Borrowings - Summary of Borrowings (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Line of Credit Facility [Line Items]          
Outstanding advances         $ 0
Total borrowing capacity $ 32,000   $ 32,000   40,500
Private Banker's Bank          
Line of Credit Facility [Line Items]          
Outstanding advances at any month-end during the period   $ 459   $ 459  
Federal Home Loan Bank Of Topeka and Private Banker's Bank          
Line of Credit Facility [Line Items]          
Average balance outstanding 3,091 5,208 1,621 3,463  
Total maximum amount outstanding at any month-end during the period $ 8,500 $ 8,459 $ 8,500 $ 8,459  
Average interest rate during the period 4.53% 5.68% 4.57% 5.72%  
Additional borrowing capacity $ 37,028   $ 37,028   45,534
Total borrowing capacity 45,528   45,528   $ 45,534
FHLB of Topeka          
Line of Credit Facility [Line Items]          
Outstanding advances at any month-end during the period 8,500 $ 8,000 8,500 $ 8,000  
Outstanding advances $ 8,500   $ 8,500