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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 669,257 $ 539,188 $ 581,992
Change in debt securities available-for-sale:      
Unrealized holding gains (losses) for the period 320,063 (21,205) (31,355)
Reclassification adjustment for securities (gains) losses realized in income 37 212 6,265
Income tax effect (80,473) 5,448 14,918
Unrealized gains (losses) on available-for-sale debt securities 239,627 (15,545) (10,172)
Change in securities held-to-maturity:      
Amortization of unrecognized losses on securities transferred     from available-for-sale 15,855 17,664 21,239
Income tax effect (4,025) (4,486) (4,047)
Changes from securities held-to-maturity 11,830 13,178 17,192
Change in hedges:      
Net unrealized derivative gains (losses) on hedges 10,961 (24,192) 69,276
Reclassification adjustment for (gains) losses realized in net income 10,505 17,628 (15,067)
Income tax effect (5,551) 1,697 (13,479)
Changes from hedges 15,915 (4,867) 40,730
Change in defined benefit pension plans:      
Amortization of net (gains) losses recognized in income 0 0 (182)
Income tax effect 0 0 45
Changes from defined benefit pension plans 0 0 (137)
Other comprehensive income (loss), net of tax 267,372 (7,234) 47,613
Comprehensive income (loss) $ 936,629 $ 531,954 $ 629,605