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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 121,229 $ 155,036 $ 241,513 $ 301,636
Change in debt securities available-for-sale:        
Unrealized holding gains (losses) for the period (17,788) (120,159) (62,497) (95,435)
Reclassification adjustment for securities (gains) losses realized in income (2) (17) 14 5,199
Income tax effect 4,441 30,043 15,683 31,189
Unrealized gains (losses) on available-for-sale securities (13,349) (90,133) (46,800) (59,047)
Change in securities held-to-maturity:        
Amortization of unrealized losses on securities transferred     from available-for-sale 4,376 5,122 8,694 10,951
Income tax effect (1,111) (1,300) (2,208) (1,431)
Changes from securities held-to-maturity 3,265 3,822 6,486 9,520
Change in hedges:        
Net unrealized derivative gains (losses) on hedges (7,035) 13,272 (26,194) 61,121
Reclassification adjustment for (gains) losses realized in net income 4,747 (32,112) 9,624 (24,820)
Income tax effect 592 4,872 4,285 (8,848)
Changes from hedges (1,696) (13,968) (12,285) 27,453
Change in defined benefit pension plans:        
Amortization of net (gains) losses recognized in income 0 6 0 (182)
Income tax effect 0 (2) 0 45
Changes from defined benefit pension plans 0 4 0 (137)
Other comprehensive income (loss), net of tax (11,780) (100,275) (52,599) (22,211)
Comprehensive income (loss) $ 109,449 $ 54,761 $ 188,914 $ 279,425