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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (180,709) | $ (134,402)
Net change in unrealized gain or loss | $ 34,159 | $ (25,242) | 160,627 | (110,895)
Reclassification of net loss realized and included in earnings | 3,280 | 2,547 | 11,483 | 6,560
Valuation adjustment employee benefit plan |  |  | (7,015) | (9,039)
Amortization of unrealized net loss on securities transferred to HTM | 954 | 747 | 2,435 | 2,427
Income tax expense (benefit) | 7,331 | (4,978) | 37,977 | (25,170)
Ending Balance | (51,156) | (220,179) | (51,156) | (220,179)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net change in unrealized gain or loss |  |  | (434) |
Ending Balance | (434) |  | (434) |
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (50,125) | (29,512)
Net change in unrealized gain or loss |  |  | 125,589 | (92,477)
Income tax expense (benefit) |  |  | 28,395 | (20,985)
Ending Balance | 47,069 | (101,004) | 47,069 | (101,004)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (12,044) | (14,585)
Amortization of unrealized net loss on securities transferred to HTM |  |  | 2,435 | 2,427
Income tax expense (benefit) |  |  | 551 | 550
Ending Balance | (10,160) | (12,708) | (10,160) | (12,708)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (110,247) | (79,078)
Reclassification of net loss realized and included in earnings |  |  | 6,851 | 3,719
Valuation adjustment employee benefit plan |  |  | (7,015) | (9,039)
Income tax expense (benefit) |  |  | (37) | (1,205)
Ending Balance | (110,374) | (83,193) | (110,374) | (83,193)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (8,293) | (11,227)
Net change in unrealized gain or loss |  |  | 35,472 | (18,418)
Reclassification of net loss realized and included in earnings |  |  | 4,632 | 2,841
Income tax expense (benefit) |  |  | 9,068 | (3,530)
Ending Balance | $ 22,743 | $ (23,274) | $ 22,743 | $ (23,274)

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