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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Debt securities gains (losses), net $ 76     $ 241     $ 90 $ 5,440
Income tax (expense) benefit (41,280)     (44,304)     (109,018) (133,118)
Interest income (expense) (391,724)     (375,086)     (1,136,603) (1,138,745)
Salaries and employee benefits 147,494     131,541     456,490 404,715
Net income (143,802) $ (121,229) $ (120,284) (147,876) $ (155,036) $ (146,600) (385,315) (449,512)
Amount Reclassified from AOCI                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net income (7,254)     (8,024)     (20,885) (1,565)
Amount Reclassified from AOCI | Unrealized gains and losses on    available-for-sale securities                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Debt securities gains (losses), net (76)     (241)     (90) (5,440)
Income tax (expense) benefit 19     63     23 1,407
Net income (57)     (178)     (67) (4,033)
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 1,203     1,430     3,411 4,186
Interest income (expense) (4,740)     (5,623)     (13,434) (16,574)
Net income (3,537)     (4,193)     (10,023) (12,388)
Amount Reclassified from AOCI | Gains and losses on hedges    Interest rate contracts | Interest rate contracts                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income tax (expense) benefit 1,276     1,274     3,765 (5,174)
Interest income (expense) (4,936)     (4,927)     (14,560) 19,893
Net income $ (3,660)     $ (3,653)     (10,795) 14,719
Amount Reclassified from AOCI | Actuarial gains (losses)                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income tax (expense) benefit             0 (45)
Salaries and employee benefits             0 182
Net income             $ 0 $ 137