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Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 7,435,127 $ 6,701,391 $ 6,400,802
Other comprehensive income (loss) before reclassifications 82,228 (7,788) 17,635
Amounts reclassified to earnings (1,273) (1,090) (89)
Other comprehensive income (loss) , net 80,955 (8,878) 17,546
Ending balance 7,807,698 7,435,127 6,701,391
Total Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (155,334) (146,456) (164,002)
Ending balance (74,379) (155,334) (146,456)
Unrealized Gains and Losses on AFS Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (133,898) (115,502) (127,818)
Other comprehensive income (loss) before reclassifications 69,346 (18,397) 12,950
Amounts reclassified to earnings (1) 1 (634)
Other comprehensive income (loss) , net 69,345 (18,396) 12,316
Ending balance (64,553) (133,898) (115,502)
Unrealized Gains and Losses on Derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1,245 2,114 2,233
Other comprehensive income (loss) before reclassifications 0 0 (757)
Amounts reclassified to earnings (825) (869) 638
Other comprehensive income (loss) , net (825) (869) (119)
Ending balance 420 1,245 2,114
Defined benefit pension and postretirement benefit plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (22,681) (33,068) (38,417)
Other comprehensive income (loss) before reclassifications 12,882 10,609 5,442
Amounts reclassified to earnings (447) (222) (93)
Other comprehensive income (loss) , net 12,435 10,387 5,349
Ending balance $ (10,246) $ (22,681) $ (33,068)