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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax $ 807,200 $ 800,970 $ 811,942 $ 773,288
Income tax (expense) benefit (8,874) 2,006 (4,465) 1,339
Ending balance, net of tax 834,850 805,254 834,850 805,254
Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (123,451) (109,881) (112,199) (107,499)
Other comprehensive (loss) income before reclassifications 16,327 6,593 (2,504) (1,094)
Reclassification adjustments included in net income 26,474 4,048 31,061 8,720
Income tax (expense) benefit (8,989) (2,235) (5,997) (1,602)
Net current-period other comprehensive income (loss), net of tax 33,812 8,406 22,560 6,024
Ending balance, net of tax (89,639) (101,475) (89,639) (101,475)
Unrealized Gains (Losses) on Derivatives        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (3) 17,444 6,303 12,803
Other comprehensive (loss) income before reclassifications 828 (13,658) (2,715) 4,641
Reclassification adjustments included in net income (1,988) (5,688) (6,427) (18,112)
Income tax (expense) benefit 243 4,063 1,919 2,829
Net current-period other comprehensive income (loss), net of tax (917) (15,283) (7,223) (10,642)
Ending balance, net of tax (920) 2,161 (920) 2,161
Retirement Plans        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (18,031) (18,517) (19,002) (18,766)
Other comprehensive (loss) income before reclassifications 0 (1,002) 0 (1,002)
Reclassification adjustments included in net income 614 156 1,844 471
Income tax (expense) benefit (128) 178 (387) 112
Net current-period other comprehensive income (loss), net of tax 486 (668) 1,457 (419)
Ending balance, net of tax (17,545) (19,185) (17,545) (19,185)
Total        
AOCI Attributable to Parent, Net of Tax        
Beginning balance, net of tax (141,485) (110,954) (124,898) (113,462)
Other comprehensive (loss) income before reclassifications 17,155 (8,067) (5,219) 2,545
Reclassification adjustments included in net income 25,100 (1,484) 26,478 (8,921)
Income tax (expense) benefit (8,874) 2,006 (4,465) 1,339
Net current-period other comprehensive income (loss), net of tax 33,381 (7,545) 16,794 (5,037)
Ending balance, net of tax $ (108,104) $ (118,499) $ (108,104) $ (118,499)