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Other Comprehensive Income (Loss) - Schedule of Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances $ 709,936 $ 682,597 $ 717,689 $ 663,054
Other comprehensive income 9,068 223 (15,808) 22,516
Ending balances 728,253 698,029 728,253 698,029
Available-for- Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (4,886) 25,838 20,609 4,039
Other comprehensive (loss) income before reclassifications 8,489 (257) (16,757) 21,866
Amounts reclassified from accumulated other comprehensive (loss) income 0 0 (249) (324)
Other comprehensive income 8,489 (257) (17,006) 21,542
Ending balances 3,603 25,581 3,603 25,581
Employee Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (52,064) (47,109) (52,683) (47,603)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 579 480 1,198 974
Other comprehensive income 579 480 1,198 974
Ending balances (51,485) (46,629) (51,485) (46,629)
Accumulated Other Comprehensive (Loss) Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (56,950) (21,271) (32,074) (43,564)
Other comprehensive (loss) income before reclassifications 8,489 (257) (16,757) 21,866
Amounts reclassified from accumulated other comprehensive (loss) income 579 480 949 650
Other comprehensive income 9,068 223 (15,808) 22,516
Ending balances $ (47,882) $ (21,048) $ (47,882) $ (21,048)