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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 765,161 $ 731,782 $ 745,997 $ 912,172
Income tax (expense) benefit 10,443 10,993 4,658 63,902
Ending balance, net of tax 728,595 707,636 728,595 707,636
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (125,929) (137,792) (149,181) 84,716
Other comprehensive (loss) income before reclassifications (52,882) (67,721) (33,032) (354,649)
Reclassification adjustments included in net income 1,997 1,495 11,579 6,768
Income tax (expense) benefit 10,686 13,908 4,506 73,055
Net current-period other comprehensive income (loss), net of tax (40,199) (52,318) (16,947) (274,826)
Ending balance, net of tax (166,128) (190,110) (166,128) (190,110)
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax 29,439 21,857 31,227 (1,257)
Other comprehensive (loss) income before reclassifications 7,377 15,226 16,277 42,819
Reclassification adjustments included in net income (6,408) (1,572) (17,570) 94
Income tax (expense) benefit (203) (2,868) 271 (9,013)
Net current-period other comprehensive income (loss), net of tax 766 10,786 (1,022) 33,900
Ending balance, net of tax 30,205 32,643 30,205 32,643
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (19,203) (23,400) (19,502) (23,754)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Reclassification adjustments included in net income 189 224 567 671
Income tax (expense) benefit (40) (47) (119) (140)
Net current-period other comprehensive income (loss), net of tax 149 177 448 531
Ending balance, net of tax (19,054) (23,223) (19,054) (23,223)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (115,693) (139,335) (137,456) 59,705
Other comprehensive (loss) income before reclassifications (45,505) (52,495) (16,755) (311,830)
Reclassification adjustments included in net income (4,222) 147 (5,424) 7,533
Income tax (expense) benefit 10,443 10,993 4,658 63,902
Net current-period other comprehensive income (loss), net of tax (39,284) (41,355) (17,521) (240,395)
Ending balance, net of tax $ (154,977) $ (180,690) $ (154,977) $ (180,690)