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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net $ (37) $ (212) $ (6,265)
Income tax expense (benefit) (172,136) (141,250) (169,310)
Interest income (expense) 2,057,874 1,530,783 1,503,153
Salaries and employee benefits (749,013) (603,095) (546,364)
Net income 669,257 539,188 581,992
Amount Reclassified from AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (19,646) (26,404) (9,234)
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 (37) (212) (6,265)
Income tax expense (benefit) 10 55 1,620
Net income (27) (157) (4,645)
Amount Reclassified from AOCI | Amortization of unrecognized 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) 4,025 4,486 5,372
Interest income (expense) (15,855) (17,664) (21,239)
Net income (11,830) (13,178) (15,867)
Amount Reclassified from AOCI | Gains and Losses on Hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 2,716 4,559 (3,926)
Interest income (expense) (10,505) (17,628) 15,067
Net income (7,789) (13,069) 11,141
Amount Reclassified from AOCI | Defined Benefit Pension Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 0 0 (45)
Salaries and employee benefits 0 0 182
Net income $ 0 $ 0 $ 137