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Other Comprehensive Income (Loss) - Schedule of Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances $ 624,318 $ 728,253 $ 728,941 $ 717,689
Other comprehensive (loss) income before reclassifications (64,873) (7,852) (188,727) (24,609)
Amounts reclassified from accumulated other comprehensive (loss) income 505 640 1,440 1,589
Other comprehensive loss (64,368) (7,212) (187,287) (23,020)
Ending balances 572,959 722,357 572,959 722,357
Available-for- Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (138,414) 3,603 (14,560) 20,609
Other comprehensive (loss) income before reclassifications (64,873) (7,852) (188,727) (24,609)
Amounts reclassified from accumulated other comprehensive (loss) income 37 41 37 (208)
Other comprehensive loss (64,836) (7,811) (188,690) (24,817)
Ending balances (203,250) (4,208) (203,250) (4,208)
Employee Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (40,455) (51,485) (41,390) (52,683)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 468 599 1,403 1,797
Other comprehensive loss 468 599 1,403 1,797
Ending balances (39,987) (50,886) (39,987) (50,886)
Accumulated Other Comprehensive (Loss) Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (178,869) (47,882) (55,950) (32,074)
Other comprehensive loss (64,368) (7,212) (187,287) (23,020)
Ending balances $ (243,237) $ (55,094) $ (243,237) $ (55,094)