Borrowings - Summary of Borrowings (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Line of Credit Facility [Line Items]
Outstanding advances	$ 0		$ 0		$ 0
Total borrowing capacity	40,500,000		40,500,000		40,100,000
FHLB of Topeka
Line of Credit Facility [Line Items]
Average balance outstanding	42,000	$ 158,000	1,064,000	$ 2,580,000
Maximum amount outstanding at any month-end during the period	$ 0	$ 0	$ 8,459,000	$ 8,000,000
Average interest rate during the period	4.83%	5.06%	5.44%	5.37%
Additional borrowing capacity	$ 45,546,000		$ 45,546,000		45,099,000
Total borrowing capacity	$ 45,546,000		$ 45,546,000		$ 45,099,000