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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 143,802 $ 147,876 $ 385,315 $ 449,512
Change in debt securities available-for-sale:        
Unrealized holding gains (losses) for the period 216,995 (208,626) 154,498 (304,061)
Reclassification adjustment for securities (gains) losses realized in income 76 241 90 5,440
Income tax effect (54,153) 51,903 (38,470) 83,092
Unrealized gains (losses) on available-for-sale securities 162,918 (156,482) 116,118 (215,529)
Change in securities held-to-maturity:        
Amortization of unrealized losses on securities transferred     from available-for-sale 4,740 5,623 13,434 16,574
Income tax effect (1,203) (1,430) (3,411) (2,861)
Changes from securities held-to-maturity 3,537 4,193 10,023 13,713
Change in hedges:        
Net unrealized derivative gains (losses) on hedges 23,654 (15,574) (2,540) 45,547
Reclassification adjustment for (gains) losses realized in net income 4,936 4,927 14,560 (19,893)
Income tax effect (7,393) 2,754 (3,108) (6,094)
Changes from hedges 21,197 (7,893) 8,912 19,560
Change in defined benefit pension plans:        
Amortization of net (gains) losses recognized in income 0 0 0 (182)
Income tax effect 0 0 0 45
Changes from defined benefit pension plans 0 0 0 (137)
Other comprehensive income (loss), net of tax 187,652 (160,182) 135,053 (182,393)
Comprehensive income (loss) $ 331,454 $ (12,306) $ 520,368 $ 267,119