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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 787,922 $ 751,030 $ 773,288 $ 745,997
Income tax (expense) benefit 25 (4,683) (667) (5,785)
Ending balance, net of tax 800,970 765,161 800,970 765,161
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (110,538) (135,627) (107,499) (149,181)
Other comprehensive (loss) income before reclassifications (1,800) 6,831 (7,687) 19,850
Reclassification adjustments included in net income 2,631 5,444 4,672 9,582
Income tax (expense) benefit (174) (2,577) 633 (6,180)
Net current-period other comprehensive income (loss), net of tax 657 9,698 (2,382) 23,252
Ending balance, net of tax (109,881) (125,929) (109,881) (125,929)
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax 18,312 21,680 12,803 31,227
Other comprehensive (loss) income before reclassifications 4,683 15,876 18,299 8,900
Reclassification adjustments included in net income (5,782) (6,054) (12,424) (11,162)
Income tax (expense) benefit 231 (2,063) (1,234) 474
Net current-period other comprehensive income (loss), net of tax (868) 7,759 4,641 (1,788)
Ending balance, net of tax 17,444 29,439 17,444 29,439
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (18,633) (19,365) (18,766) (19,502)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Reclassification adjustments included in net income 148 205 315 378
Income tax (expense) benefit (32) (43) (66) (79)
Net current-period other comprehensive income (loss), net of tax 116 162 249 299
Ending balance, net of tax (18,517) (19,203) (18,517) (19,203)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (110,859) (133,312) (113,462) (137,456)
Other comprehensive (loss) income before reclassifications 2,883 22,707 10,612 28,750
Reclassification adjustments included in net income (3,003) (405) (7,437) (1,202)
Income tax (expense) benefit 25 (4,683) (667) (5,785)
Net current-period other comprehensive income (loss), net of tax (95) 17,619 2,508 21,763
Ending balance, net of tax $ (110,954) $ (115,693) $ (110,954) $ (115,693)