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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (772,182) | $ (53,935)
Net change in unrealized gain (loss) |  |  | (187,089) | (961,892)
Reclassification of net income or loss realized and included in earnings | $ 12,854 | $ (1,441) | 33,619 | (10,849)
Valuation adjustments to employee benefit plans |  |  | (7,307) | (8,397)
Amortization of unrealized net loss on securities transferred to HTM | 421 | 434 | 1,343 | 961
Income tax (expense) benefit | 38,833 | 83,250 | 36,622 | 221,331
Ending Balance | (894,994) | (812,781) | (894,994) | (812,781)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (584,408) | 11,037
Net change in unrealized gain (loss) |  |  | (142,980) | (844,250)
Reclassification of net income or loss realized and included in earnings |  |  |  | 1,707
Transfer of net unrealized loss from AFS to HTM securities portfolio |  |  |  | 15,405
Income tax (expense) benefit |  |  | 32,757 | 186,685
Ending Balance | (694,631) | (629,416) | (694,631) | (629,416)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (10,734) | 153
Transfer of net unrealized loss from AFS to HTM securities portfolio |  |  |  | (15,405)
Amortization of unrealized net loss on securities transferred to HTM |  |  | 1,343 | 961
Income tax (expense) benefit |  |  | (302) | 3,260
Ending Balance | (9,693) | (11,031) | (9,693) | (11,031)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (97,952) | (80,946)
Reclassification of net income or loss realized and included in earnings |  |  | 5,010 | 1,963
Valuation adjustments to employee benefit plans |  |  | (7,307) | (8,397)
Income tax (expense) benefit |  |  | 517 | 1,452
Ending Balance | (99,732) | (85,928) | (99,732) | (85,928)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (79,093) | 16,284
Net change in unrealized gain (loss) |  |  | (44,823) | (118,110)
Reclassification of net income or loss realized and included in earnings |  |  | 28,609 | (14,519)
Income tax (expense) benefit |  |  | 3,650 | 29,934
Ending Balance | (91,657) | (86,411) | (91,657) | (86,411)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 5 | (463)
Net change in unrealized gain (loss) |  |  | 714 | 468
Ending Balance | $ 719 | $ 5 | $ 719 | $ 5

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