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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 784,241 $ 858,597 $ 912,172 $ 875,297
Income tax benefit (expense) 15,700 (6,726) 52,909 1,114
Ending balance, net of tax 731,782 894,400 731,782 894,400
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (72,699) 76,131 84,716 116,078
Other comprehensive (loss) income before reclassifications (85,883) 33,166 (286,928) (15,813)
Reclassification adjustments included in net income 3,487 375 5,273 (1,212)
Income tax benefit (expense) 17,303 (7,044) 59,147 3,575
Net current-period other comprehensive (loss) income, net of tax (65,093) 26,497 (222,508) (13,450)
Ending balance, net of tax (137,792) 102,628 (137,792) 102,628
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax 16,018 (7,144) (1,257) (17,091)
Other comprehensive (loss) income before reclassifications 7,047 (3,104) 27,593 7,919
Reclassification adjustments included in net income 344 1,599 1,666 3,167
Income tax benefit (expense) (1,552) 315 (6,145) (2,329)
Net current-period other comprehensive (loss) income, net of tax 5,839 (1,190) 23,114 8,757
Ending balance, net of tax 21,857 (8,334) 21,857 (8,334)
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (23,590) (29,401) (23,754) (29,907)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Reclassification adjustments included in net income 241 (9) 447 632
Income tax benefit (expense) (51) 3 (93) (132)
Net current-period other comprehensive (loss) income, net of tax 190 (6) 354 500
Ending balance, net of tax (23,400) (29,407) (23,400) (29,407)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (80,271) 39,586 59,705 69,080
Other comprehensive (loss) income before reclassifications (78,836) 30,062 (259,335) (7,894)
Reclassification adjustments included in net income 4,072 1,965 7,386 2,587
Income tax benefit (expense) 15,700 (6,726) 52,909 1,114
Net current-period other comprehensive (loss) income, net of tax (59,064) 25,301 (199,040) (4,193)
Ending balance, net of tax $ (139,335) $ 64,887 $ (139,335) $ 64,887