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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 816,623 $ 787,922 $ 811,942 $ 773,288
Income tax (expense) benefit 2,570 25 4,409 (667)
Ending balance, net of tax 807,200 800,970 807,200 800,970
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (115,078) (110,538) (112,199) (107,499)
Other comprehensive (loss) income before reclassifications (12,618) (1,800) (18,831) (7,687)
Reclassification adjustments included in net income 2,019 2,631 4,587 4,672
Income tax (expense) benefit 2,226 (174) 2,992 633
Net current-period other comprehensive income (loss), net of tax (8,373) 657 (11,252) (2,382)
Ending balance, net of tax (123,451) (109,881) (123,451) (109,881)
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax 1,781 18,312 6,303 12,803
Other comprehensive (loss) income before reclassifications (392) 4,683 (3,543) 18,299
Reclassification adjustments included in net income (1,866) (5,782) (4,439) (12,424)
Income tax (expense) benefit 474 231 1,676 (1,234)
Net current-period other comprehensive income (loss), net of tax (1,784) (868) (6,306) 4,641
Ending balance, net of tax (3) 17,444 (3) 17,444
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (18,517) (18,633) (19,002) (18,766)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Reclassification adjustments included in net income 616 148 1,230 315
Income tax (expense) benefit (130) (32) (259) (66)
Net current-period other comprehensive income (loss), net of tax 486 116 971 249
Ending balance, net of tax (18,031) (18,517) (18,031) (18,517)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (131,814) (110,859) (124,898) (113,462)
Other comprehensive (loss) income before reclassifications (13,010) 2,883 (22,374) 10,612
Reclassification adjustments included in net income 769 (3,003) 1,378 (7,437)
Income tax (expense) benefit 2,570 25 4,409 (667)
Net current-period other comprehensive income (loss), net of tax (9,671) (95) (16,587) 2,508
Ending balance, net of tax $ (141,485) $ (110,954) $ (141,485) $ (110,954)