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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax $ 745,997 $ 912,172
Income tax (expense) benefit (1,102) 37,209
Ending balance, net of tax 751,030 784,241
Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (149,181) 84,716
Other comprehensive (loss) income before reclassifications 13,019 (201,045)
Reclassification adjustments included in net income 4,138 1,786
Income tax (expense) benefit (3,603) 41,844
Net current-period other comprehensive income (loss), net of tax 13,554 (157,415)
Ending balance, net of tax (135,627) (72,699)
Unrealized Gains (Losses) on Derivatives    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax 31,227 (1,257)
Other comprehensive (loss) income before reclassifications (6,976) 20,546
Reclassification adjustments included in net income (5,108) 1,322
Income tax (expense) benefit 2,537 (4,593)
Net current-period other comprehensive income (loss), net of tax (9,547) 17,275
Ending balance, net of tax 21,680 16,018
Retirement Plans    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (19,502) (23,754)
Other comprehensive (loss) income before reclassifications 0 0
Reclassification adjustments included in net income 173 206
Income tax (expense) benefit (36) (42)
Net current-period other comprehensive income (loss), net of tax 137 164
Ending balance, net of tax (19,365) (23,590)
Total    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (137,456) 59,705
Other comprehensive (loss) income before reclassifications 6,043 (180,499)
Reclassification adjustments included in net income (797) 3,314
Income tax (expense) benefit (1,102) 37,209
Net current-period other comprehensive income (loss), net of tax 4,144 (139,976)
Ending balance, net of tax $ (133,312) $ (80,271)