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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net $ 6,265 $ 88 $ (4,327)
Income tax expense (benefit) (169,310) (116,446) (61,324)
Interest income (expense) (1,503,153) (1,327,936) (596,400)
Salaries and employee benefits 546,364 575,626 284,098
Net income (581,992) (428,287) (277,538)
Amount Reclassified from AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (9,234) (14,688) 6,631
Amount Reclassified from AOCI | Unrealized Gains and Losses on Available- for-Sale Debt Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net (6,265) (88) 4,327
Income tax expense (benefit) 1,620 21 (990)
Net income (4,645) (67) 3,337
Amount Reclassified from AOCI | Amortization of unrealized losses on    held-to-maturity securities transferred    from available-for-sale      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 5,372 4,047 0
Interest income (expense) (21,239) (16,612) 0
Net income 15,867 12,565 0
Amount Reclassified from AOCI | Gains and Losses on Hedges | Interest rate contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) (3,926) 636 (1,131)
Interest income (expense) 15,067 (2,587) 4,605
Net income 11,141 (1,951) 3,474
Amount Reclassified from AOCI | Defined Benefit Pension Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) (45) 34 59
Salaries and employee benefits 182 (139) (239)
Net income $ 137 $ (105) $ (180)