Other Comprehensive Income (Loss) - Schedule of Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 657,492	$ 709,936	$ 728,941	$ 717,689
Other comprehensive (loss) income before reclassifications	(43,449)	8,489	(123,854)	(16,757)
Amounts reclassified from accumulated other comprehensive (loss) income	429	579	935	949
Other comprehensive (loss) income	(43,020)	9,068	(122,919)	(15,808)
Ending balances	624,318	728,253	624,318	728,253
Available-for- Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(94,965)	(4,886)	(14,560)	20,609
Other comprehensive (loss) income before reclassifications	(43,449)	8,489	(123,854)	(16,757)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	(249)
Other comprehensive (loss) income	(43,449)	8,489	(123,854)	(17,006)
Ending balances	(138,414)	3,603	(138,414)	3,603
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(40,884)	(52,064)	(41,390)	(52,683)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	429	579	935	1,198
Other comprehensive (loss) income	429	579	935	1,198
Ending balances	(40,455)	(51,485)	(40,455)	(51,485)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(135,849)	(56,950)	(55,950)	(32,074)
Other comprehensive (loss) income	(43,020)	9,068	(122,919)	(15,808)
Ending balances	$ (178,869)	$ (47,882)	$ (178,869)	$ (47,882)