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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 80,069 | $ (54,724)
Net change in unrealized gain or loss | $ (48,569) | $ 425 | (143,924) | 217,254
Reclassification of net income or loss realized and included in earnings | (6,425) | (4,076) | (9,337) | (6,593)
Valuation adjustment to employee benefit plans |  |  |  | (10,251)
Valuation Adjustments to Pension Plan attributable to VERIP and Curtailment |  |  | 59,606 |
Other valuation adjustments to employee benefit plans |  |  | (10,651) |
Amortization of unrealized net gain or loss on securities transferred to HTM | (33) | (89) | (134) | (378)
Income tax expense (benefit) | (12,363) | 48 | (24,569) | 46,370
Ending Balance | 198 | 98,938 | 198 | 98,938
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (5,369) | (434)
Net change in unrealized gain or loss |  |  | 438 | (4,935)
Reclassification of net income or loss realized and included in earnings |  |  | 4,468 |
Ending Balance | (463) | (5,369) | (463) | (5,369)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 171,224 | 28,950
Net change in unrealized gain or loss |  |  | (144,715) | 176,009
Reclassification of net income or loss realized and included in earnings |  |  | 2,166 |
Income tax expense (benefit) |  |  | (31,952) | 39,817
Ending Balance | 60,627 | 165,142 | 60,627 | 165,142
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 276 | 639
Amortization of unrealized net gain or loss on securities transferred to HTM |  |  | (134) | (378)
Income tax expense (benefit) |  |  | (30) | (85)
Ending Balance | 172 | 346 | 172 | 346
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (125,573) | (101,278)
Reclassification of net income or loss realized and included in earnings |  |  | 3,970 | 4,656
Valuation adjustment to employee benefit plans |  |  |  | (10,251)
Valuation Adjustments to Pension Plan attributable to VERIP and Curtailment |  |  | 59,606 |
Other valuation adjustments to employee benefit plans |  |  | (10,651) |
Income tax expense (benefit) |  |  | 11,783 | (1,265)
Ending Balance | (84,431) | (105,608) | (84,431) | (105,608)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 39,511 | 17,399
Net change in unrealized gain or loss |  |  | 353 | 46,180
Reclassification of net income or loss realized and included in earnings |  |  | (19,941) | (11,249)
Income tax expense (benefit) |  |  | (4,370) | 7,903
Ending Balance | $ 24,293 | $ 44,427 | $ 24,293 | $ 44,427

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