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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Changes in accumulated other comprehensive (loss) income by component, net of tax        
Beginning balance $ 1,254,171 $ 1,198,480 $ 1,221,939 $ 1,198,644
Other comprehensive income (loss) 10,084 22,801 22,288 12,265
Reclassification adjustment for (income) expense recognized in earnings 389 811 1,689 2,452
Ending balance 2,414,996 1,230,362 2,414,996 1,230,362
Accumulated Other Comprehensive Income (Loss)        
Changes in accumulated other comprehensive (loss) income by component, net of tax        
Beginning balance (39,378) (61,693) (52,882) (52,798)
Ending balance (28,905) (38,081) (28,905) (38,081)
Investment Securities Available-for-Sale        
Changes in accumulated other comprehensive (loss) income by component, net of tax        
Beginning balance (39,654) (59,733) (53,718) (52,546)
Other comprehensive income (loss) 10,173 20,429 24,237 13,242
Reclassification adjustment for (income) expense recognized in earnings 0 0 0 0
Ending balance (29,481) (39,304) (29,481) (39,304)
Net Change in Fair Value of Cash Flow Hedges        
Changes in accumulated other comprehensive (loss) income by component, net of tax        
Beginning balance (436) (3,289) (1,323) (1,581)
Other comprehensive income (loss) (89) 2,372 6 (977)
Reclassification adjustment for (income) expense recognized in earnings 389 811 1,181 2,452
Ending balance (136) (106) (136) (106)
Postretirement Benefits        
Changes in accumulated other comprehensive (loss) income by component, net of tax        
Beginning balance 712 1,329 2,159 1,329
Other comprehensive income (loss) 0 0 (1,955) 0
Reclassification adjustment for (income) expense recognized in earnings 0 0 508 0
Ending balance $ 712 $ 1,329 $ 712 $ 1,329