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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

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