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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax $ 773,288 $ 745,997
Income tax (expense) benefit (692) (1,102)
Ending balance, net of tax 787,922 751,030
Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (107,499) (149,181)
Other comprehensive (loss) income before reclassifications (5,887) 13,019
Reclassification adjustments included in net income 2,041 4,138
Income tax (expense) benefit 807 (3,603)
Net current-period other comprehensive income (loss), net of tax (3,039) 13,554
Ending balance, net of tax (110,538) (135,627)
Unrealized Gains (Losses) on Derivatives    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax 12,803 31,227
Other comprehensive (loss) income before reclassifications 13,616 (6,976)
Reclassification adjustments included in net income (6,642) (5,108)
Income tax (expense) benefit (1,465) 2,537
Net current-period other comprehensive income (loss), net of tax 5,509 (9,547)
Ending balance, net of tax 18,312 21,680
Retirement Plans    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (18,766) (19,502)
Other comprehensive (loss) income before reclassifications 0 0
Reclassification adjustments included in net income 167 173
Income tax (expense) benefit (34) (36)
Net current-period other comprehensive income (loss), net of tax 133 137
Ending balance, net of tax (18,633) (19,365)
Total    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (113,462) (137,456)
Other comprehensive (loss) income before reclassifications 7,729 6,043
Reclassification adjustments included in net income (4,434) (797)
Income tax (expense) benefit (692) (1,102)
Net current-period other comprehensive income (loss), net of tax 2,603 4,144
Ending balance, net of tax $ (110,859) $ (133,312)