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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning $ 728,941 $ 717,689
Other comprehensive loss (79,899) (24,876)
Balances at Ending 657,492 709,936
Available-for- Sale Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (14,560) 20,609
Other comprehensive (loss) income before reclassifications (80,405) (25,246)
Amounts reclassified from accumulated other comprehensive (loss) income 0 (249)
Other comprehensive loss (80,405) (25,495)
Balances at Ending (94,965) (4,886)
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (41,390) (52,683)
Other comprehensive (loss) income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 506 619
Other comprehensive loss 506 619
Balances at Ending (40,884) (52,064)
Accumulated Other Comprehensive (Loss) Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (55,950) (32,074)
Other comprehensive (loss) income before reclassifications (80,405) (25,246)
Amounts reclassified from accumulated other comprehensive (loss) income 506 370
Other comprehensive loss (79,899) (24,876)
Balances at Ending $ (135,849) $ (56,950)