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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 4,127,636 $ 3,803,661
Reclassification of net loss realized and included in earnings 9,415 13,577
Amortization of unrealized net loss on securities transferred to HTM 405 428
Income tax (expense) benefit (28,212) 9,392
Balance 4,278,672 3,853,436
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (473,679) (450,748)
Net change in unrealized gain (loss) 102,125 (48,264)
Income tax (expense) benefit (24,014) 10,927
Balance (395,568) (488,085)
Held to Maturity Securities Transferred from AFS [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (8,071) (9,385)
Amortization of unrealized net loss on securities transferred to HTM 405 428
Income tax (expense) benefit (109) (96)
Balance (7,775) (9,053)
Employee Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (77,235) (103,061)
Reclassification of net loss realized and included in earnings 955 1,019
Valuation adjustments to employee benefit plans   22,014
Income tax (expense) benefit (384) (5,176)
Balance (76,664) (85,204)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (606,092) (621,127)
Net change in unrealized gain (loss) 109,512 (77,799)
Reclassification of net loss realized and included in earnings 9,415 13,577
Valuation adjustments to employee benefit plans   22,014
Amortization of unrealized net loss on securities transferred to HTM 405 428
Income tax (expense) benefit (28,212) 9,392
Balance (514,972) (653,515)
Gains and Losses on Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (47,136) (58,306)
Net change in unrealized gain (loss) 7,560 (29,191)
Reclassification of net loss realized and included in earnings 8,460 12,558
Income tax (expense) benefit (3,705) 3,737
Balance (34,821) (71,202)
Equity Method Investment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 29 373
Net change in unrealized gain (loss) (173) (344)
Balance $ (144) $ 29