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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss)    
Balance $ 9,059,108 $ 5,890,415
Accumulated Other Comprehensive Income (Loss) (42,728) 230,254
Balance 9,030,916 8,624,361
Benefit Plans    
Accumulated Other Comprehensive Income (Loss)    
Balance 565 578
Balance 565 578
Unrealized Losses on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss)    
Balance (283,946) (607,499)
Other comprehensive income (loss) before reclassifications (42,728) 56,586
Amounts reclassified from accumulated other comprehensive loss   173,668
Accumulated Other Comprehensive Income (Loss) (42,728) 230,254
Balance (326,674) (377,245)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss)    
Balance (283,381) (606,921)
Other comprehensive income (loss) before reclassifications (42,728) 56,586
Amounts reclassified from accumulated other comprehensive loss   173,668
Accumulated Other Comprehensive Income (Loss) (42,728) 230,254
Balance $ (326,109) $ (376,667)