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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | $ 4,365,419 | $ 3,920,718 | $ 4,127,636 | $ 3,803,661
Reclassification of net loss realized and included in earnings | 9,714 | 13,964 | 28,797 | 41,689
Amortization of unrealized net loss on securities transferred to HTM | 413 | 461 | 1,205 | 1,279
Income tax (expense) benefit | (14,661) | (51,688) | (56,054) | (40,903)
Balance | 4,474,479 | 4,174,687 | 4,474,479 | 4,174,687
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) |  |  | 202,858 | 132,391
Income tax (expense) benefit |  |  | (46,822) | (28,958)
Balance | (317,643) | (347,315) | (317,643) | (347,315)
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 |  |  | 1,205 | 1,279
Income tax (expense) benefit |  |  | (289) | (268)
Balance | (7,155) | (8,374) | (7,155) | (8,374)
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 |  |  | 2,623 | 3,569
Valuation adjustments to employee benefit plans |  |  |  | 22,014
Income tax (expense) benefit |  |  | (759) | (5,555)
Balance | (75,371) | (83,033) | (75,371) | (83,033)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (469,827) | (657,936) | (606,092) | (621,127)
Net change in unrealized gain (loss) |  |  | 215,684 | 121,552
Reclassification of net loss realized and included in earnings |  |  | 28,797 | 41,689
Valuation adjustments to employee benefit plans |  |  |  | 22,014
Amortization of unrealized net loss on securities transferred to HTM |  |  | 1,205 | 1,279
Income tax (expense) benefit |  |  | (56,054) | 40,903
Balance | (416,460) | (475,496) | (416,460) | (475,496)
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) |  |  | 9,770 | (10,495)
Reclassification of net loss realized and included in earnings |  |  | 26,174 | 38,120
Income tax (expense) benefit |  |  | (8,184) | (6,122)
Balance | (19,376) | (36,803) | (19,376) | (36,803)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 29 | 373
Net change in unrealized gain (loss) |  |  | 3,056 | (344)
Balance | $ 3,085 | $ 29 | $ 3,085 | $ 29

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