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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax $ 811,942 $ 773,288
Income tax (expense) benefit 1,839 (692)
Ending balance, net of tax 816,623 787,922
Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (112,199) (107,499)
Other comprehensive (loss) income before reclassifications (6,213) (5,887)
Reclassification adjustments included in net income 2,568 2,041
Income tax (expense) benefit 766 807
Net current-period other comprehensive income (loss), net of tax (2,879) (3,039)
Ending balance, net of tax (115,078) (110,538)
Unrealized Gains (Losses) on Derivatives    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax 6,303 12,803
Other comprehensive (loss) income before reclassifications (3,151) 13,616
Reclassification adjustments included in net income (2,573) (6,642)
Income tax (expense) benefit 1,202 (1,465)
Net current-period other comprehensive income (loss), net of tax (4,522) 5,509
Ending balance, net of tax 1,781 18,312
Retirement Plans    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (19,002) (18,766)
Other comprehensive (loss) income before reclassifications 0 0
Reclassification adjustments included in net income 614 167
Income tax (expense) benefit (129) (34)
Net current-period other comprehensive income (loss), net of tax 485 133
Ending balance, net of tax (18,517) (18,633)
Total    
AOCI Attributable to Parent, Net of Tax    
Beginning balance, net of tax (124,898) (113,462)
Other comprehensive (loss) income before reclassifications (9,364) 7,729
Reclassification adjustments included in net income 609 (4,434)
Income tax (expense) benefit 1,839 (692)
Net current-period other comprehensive income (loss), net of tax (6,916) 2,603
Ending balance, net of tax $ (131,814) $ (110,859)