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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (53,935) | $ 80,069
Net change in unrealized gain or loss | $ (367,437) | $ (48,569) | (961,892) | (143,924)
Reclassification of net income or loss realized and included in earnings | (1,441) | (6,425) | (10,849) | (9,337)
Valuation adjustments to pension plan attributable to VERIP and curtailment |  |  |  | 59,606
Other valuation adjustments to employee benefit plans |  |  | (8,397) | (10,651)
Amortization of unrealized net gain or loss on securities transferred to HTM | 434 | (33) | 961 | (134)
Income tax (expense) benefit | 83,250 | 12,363 | 221,331 | 24,569
Ending Balance | (812,781) | 198 | (812,781) | 198
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 11,037 | 171,224
Net change in unrealized gain or loss |  |  | (844,250) | (144,715)
Reclassification of net income or loss realized and included in earnings |  |  | 1,707 | 2,166
Transfer of net unrealized loss from AFS to HTM securities portfolio |  |  | 15,405 |
Income tax (expense) benefit |  |  | 186,685 | 31,952
Ending Balance | (629,416) | 60,627 | (629,416) | 60,627
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 153 | 276
Transfer of net unrealized loss from AFS to HTM securities portfolio |  |  | (15,405) |
Amortization of unrealized net gain or loss on securities transferred to HTM |  |  | 961 | (134)
Income tax (expense) benefit |  |  | 3,260 | 30
Ending Balance | (11,031) | 172 | (11,031) | 172
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (80,946) | (125,573)
Reclassification of net income or loss realized and included in earnings |  |  | 1,963 | 3,970
Valuation adjustments to pension plan attributable to VERIP and curtailment |  |  |  | 59,606
Other valuation adjustments to employee benefit plans |  |  | (8,397) | (10,651)
Income tax (expense) benefit |  |  | 1,452 | (11,783)
Ending Balance | (85,928) | (84,431) | (85,928) | (84,431)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 16,284 | 39,511
Net change in unrealized gain or loss |  |  | (118,110) | 353
Reclassification of net income or loss realized and included in earnings |  |  | (14,519) | (19,941)
Income tax (expense) benefit |  |  | 29,934 | 4,370
Ending Balance | (86,411) | 24,293 | (86,411) | 24,293
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (463) | (5,369)
Net change in unrealized gain or loss |  |  | 468 | 438
Reclassification of net income or loss realized and included in earnings |  |  |  | 4,468
Ending Balance | $ 5 | $ (463) | $ 5 | $ (463)

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