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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)

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