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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 4,460,117 $ 4,127,636
Reclassification of net loss realized and included in earnings 104,592 9,415
Amortization of unrealized net loss on securities transferred to HTM 413 405
Income tax (expense) benefit (14,911) (28,212)
Balance 4,419,592 4,278,672
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (293,835) (473,679)
Net change in unrealized gain (loss) (30,250) 102,125
Reclassification of net loss realized and included in earnings 98,595  
Income tax (expense) benefit (15,404) (24,014)
Balance (240,894) (395,568)
Held to Maturity Securities Transferred from AFS [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (6,858) (8,071)
Amortization of unrealized net loss on securities transferred to HTM 413 405
Income tax (expense) benefit (93) (109)
Balance (6,538) (7,775)
Employee Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (61,448) (77,235)
Reclassification of net loss realized and included in earnings 17 955
Valuation adjustments to employee benefit plans (496)  
Income tax (expense) benefit 108 (384)
Balance (61,819) (76,664)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (376,251) (606,092)
Net change in unrealized gain (loss) (38,474) 109,512
Reclassification of net loss realized and included in earnings 104,592 9,415
Valuation adjustments to employee benefit plans (496)  
Amortization of unrealized net loss on securities transferred to HTM 413 405
Income tax (expense) benefit (14,911) (28,212)
Balance (325,127) (514,972)
Gains and Losses on Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (14,795) (47,136)
Net change in unrealized gain (loss) (8,098) 7,560
Reclassification of net loss realized and included in earnings 5,980 8,460
Income tax (expense) benefit 478 (3,705)
Balance (16,435) (34,821)
Equity Method Investment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 685 29
Net change in unrealized gain (loss) (126) (173)
Balance $ 559 $ (144)