Accumulated Other Comprehensive Loss - Schedule of Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ 1,903	$ 1,381	$ 5,091	$ 4,478
Income tax (expense) benefit	(218)	260	(709)	(137)
Net income (loss)	937	(1,056)	2,856	691
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	2,190	212	489	(2,955)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for- Sale Debt Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt Securities gains (losses), net	2,772	251	617	(3,800)
Income tax (expense) benefit	(582)	(54)	(128)	794
Net income (loss)	2,190	197	489	(3,006)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	0	19	0	59
Income tax (expense) benefit	0	(4)	0	(8)
Net income (loss)	$ 0	$ 15	$ 0	$ 51