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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 539,188 $ 581,992 $ 428,287
Change in debt securities available-for-sale:      
Unrealized holding gains (losses) for the period (21,205) (31,355) (1,004,054)
Reclassification for securities transferred to held-to-maturity 0 0 165,473
Reclassification adjustment for securities (gains) losses realized in income 212 6,265 88
Income tax effect 5,448 14,918 199,097
Unrealized gains (losses) on available-for-sale debt securities (15,545) (10,172) (639,396)
Change in securities held-to-maturity:      
Adjustment for securities transferred from available-for-sale 0 0 (165,473)
Amortization of unrealized losses on securities transferred     from available-for-sale 17,664 21,239 16,612
Income tax effect (4,486) (4,047) 36,197
Changes from securities held-to-maturity 13,178 17,192 (112,664)
Change in hedges:      
Net unrealized derivative gains (losses) on hedges (24,192) 69,276 (45,132)
Reclassification adjustment for (gains) losses realized in net income 17,628 (15,067) 2,587
Income tax effect 1,697 (13,479) 10,453
Changes from hedges (4,867) 40,730 (32,092)
Change in defined benefit pension plans:      
Amortization of net (gains) losses recognized in income 0 (182) 139
Income tax effect 0 45 (34)
Changes from defined benefit pension plans 0 (137) 105
Other comprehensive income (loss), net of tax (7,234) 47,613 (784,047)
Comprehensive income (loss) $ 531,954 $ 629,605 $ (355,760)