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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net $ 88 $ (4,327) $ (10,767)
Income tax expense (benefit) (116,446) (61,324) (29,147)
Interest income (expense) (1,327,936) (596,400) (596,094)
Salaries and employee benefits 575,626 284,098 293,590
Net income (428,287) (277,538) (226,409)
Amount Reclassified from AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (14,688) 6,631 12,262
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 (88) 4,327 10,767
Income tax expense (benefit) 21 (990) (2,375)
Net income (67) 3,337 8,392
Amount Reclassified from AOCI | Unrealized gains and losses on    held-to-maturity securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 4,047 0 0
Interest income (expense) (16,612) 0 0
Net income 12,565 0 0
Amount Reclassified from AOCI | Gains and Losses on Cash Flow Hedges | Interest Rate Contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 636 (1,131) (1,267)
Interest income (expense) (2,587) 4,605 5,153
Net income (1,951) 3,474 3,886
Amount Reclassified from AOCI | Defined Benefit Pension Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 34 59 5
Salaries and employee benefits (139) (239) (21)
Net income $ (105) $ (180) $ (16)