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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 800,970 $ 765,161 $ 773,288 $ 745,997
Income tax (expense) benefit 2,006 10,443 1,339 4,658
Ending balance, net of tax 805,254 728,595 805,254 728,595
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (109,881) (125,929) (107,499) (149,181)
Other comprehensive (loss) income before reclassifications 6,593 (52,882) (1,094) (33,032)
Reclassification adjustments included in net income 4,048 1,997 8,720 11,579
Income tax (expense) benefit (2,235) 10,686 (1,602) 4,506
Net current-period other comprehensive income (loss), net of tax 8,406 (40,199) 6,024 (16,947)
Ending balance, net of tax (101,475) (166,128) (101,475) (166,128)
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax 17,444 29,439 12,803 31,227
Other comprehensive (loss) income before reclassifications (13,658) 7,377 4,641 16,277
Reclassification adjustments included in net income (5,688) (6,408) (18,112) (17,570)
Income tax (expense) benefit 4,063 (203) 2,829 271
Net current-period other comprehensive income (loss), net of tax (15,283) 766 (10,642) (1,022)
Ending balance, net of tax 2,161 30,205 2,161 30,205
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (18,517) (19,203) (18,766) (19,502)
Other comprehensive (loss) income before reclassifications (1,002) 0 (1,002) 0
Reclassification adjustments included in net income 156 189 471 567
Income tax (expense) benefit 178 (40) 112 (119)
Net current-period other comprehensive income (loss), net of tax (668) 149 (419) 448
Ending balance, net of tax (19,185) (19,054) (19,185) (19,054)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (110,954) (115,693) (113,462) (137,456)
Other comprehensive (loss) income before reclassifications (8,067) (45,505) 2,545 (16,755)
Reclassification adjustments included in net income (1,484) (4,222) (8,921) (5,424)
Income tax (expense) benefit 2,006 10,443 1,339 4,658
Net current-period other comprehensive income (loss), net of tax (7,545) (39,284) (5,037) (17,521)
Ending balance, net of tax $ (118,499) $ (154,977) $ (118,499) $ (154,977)