Accumulated Other Comprehensive Loss - Schedule 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
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 38,482	$ 36,982	$ 38,666	$ 38,402
Other comprehensive (loss) income	2,190	212	489	(2,955)
Ending balance	77,794	36,138	77,794	36,138
Unrealized Gains and Losses on Available-for- Sale Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,419)	(5,236)	(4,718)	(2,033)
Other comprehensive (loss) income	2,190	197	489	(3,006)
Ending balance	(4,229)	(5,039)	(4,229)	(5,039)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(389)	(1,656)	(389)	(1,692)
Other comprehensive (loss) income	0	15	0	51
Ending balance	(389)	(1,641)	(389)	(1,641)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,808)	(6,892)	(5,107)	(3,725)
Other comprehensive (loss) income	2,190	212	489	(2,955)
Ending balance	$ (4,618)	$ (6,680)	$ (4,618)	$ (6,680)