v3.26.1
Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss)        
Beginning balance $ 7,828,443 $ 7,499,897 $ 7,807,698 $ 7,435,127
Other comprehensive (loss) gain before reclassification (1,732) 8,496 (24,837) 35,708
Amounts reclassified to earnings (282) (133) (401) (263)
Other comprehensive (loss) income, net (2,014) 8,363 (25,238) 35,445
Ending balance 7,917,144 7,575,421 7,917,144 7,575,421
Total Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss)        
Beginning balance (97,603) (128,252) (74,379) (155,334)
Ending balance (99,617) (119,889) (99,617) (119,889)
Unrealized Gains and Losses on AFS Securities        
Accumulated Other Comprehensive Income (Loss)        
Beginning balance (87,665) (106,686) (64,553) (133,898)
Other comprehensive (loss) gain before reclassification (4,031) 8,496 (27,136) 35,708
Amounts reclassified to earnings 0 0 (7) 0
Other comprehensive (loss) income, net (4,031) 8,496 (27,143) 35,708
Ending balance (91,696) (98,190) (91,696) (98,190)
Unrealized Gains and Losses on Derivatives        
Accumulated Other Comprehensive Income (Loss)        
Beginning balance 297 1,027 420 1,245
Other comprehensive (loss) gain before reclassification 0 0 0 0
Amounts reclassified to earnings (125) (221) (248) (439)
Other comprehensive (loss) income, net (125) (221) (248) (439)
Ending balance 172 806 172 806
Defined Benefit Pension and Postretirement Benefit Plans        
Accumulated Other Comprehensive Income (Loss)        
Beginning balance (10,235) (22,593) (10,246) (22,681)
Other comprehensive (loss) gain before reclassification 2,299 0 2,299 0
Amounts reclassified to earnings (157) 88 (146) 176
Other comprehensive (loss) income, net 2,142 88 2,153 176
Ending balance $ (8,093) $ (22,505) $ (8,093) $ (22,505)