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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (621,127) | $ (772,182)
Net change in unrealized gain (loss) |  |  | 121,552 | (187,089)
Reclassification of net loss realized and included in earnings | $ 13,964 | $ 12,854 | 41,689 | 33,619
Valuation adjustments to employee benefit plans |  |  | 22,014 | (7,307)
Amortization of unrealized net loss on securities transferred to HTM | 461 | 421 | 1,279 | 1,343
Income tax (expense) benefit | (51,688) | 38,833 | (40,903) | 36,622
Ending Balance | (475,496) | (894,994) | (475,496) | (894,994)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (450,748) | (584,408)
Net change in unrealized gain (loss) |  |  | 132,391 | (142,980)
Income tax (expense) benefit |  |  | (28,958) | 32,757
Ending Balance | (347,315) | (694,631) | (347,315) | (694,631)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (9,385) | (10,734)
Amortization of unrealized net loss on securities transferred to HTM |  |  | 1,279 | 1,343
Income tax (expense) benefit |  |  | (268) | (302)
Ending Balance | (8,374) | (9,693) | (8,374) | (9,693)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (103,061) | (97,952)
Reclassification of net loss realized and included in earnings |  |  | 3,569 | 5,010
Valuation adjustments to employee benefit plans |  |  | 22,014 | (7,307)
Income tax (expense) benefit |  |  | (5,555) | 517
Ending Balance | (83,033) | (99,732) | (83,033) | (99,732)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (58,306) | (79,093)
Net change in unrealized gain (loss) |  |  | (10,495) | (44,823)
Reclassification of net loss realized and included in earnings |  |  | 38,120 | 28,609
Income tax (expense) benefit |  |  | (6,122) | 3,650
Ending Balance | (36,803) | (91,657) | (36,803) | (91,657)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 373 | 5
Net change in unrealized gain (loss) |  |  | (344) | 714
Ending Balance | $ 29 | $ 719 | $ 29 | $ 719

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