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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Securities gains (losses) |  | $ 351 |  | $ 4,293 |  | $ 26,673
Income taxes |  | (103,297) |  | (219,946) |  | $ (125,585)
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 23,667 |  | 3,419 |  |
Unrealized losses on securities available for sale |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Securities gains (losses) | [1] | 351 |  | 4,293 |  |
Income taxes | [1] | (81) |  | (1,588) |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | (270) |  | (2,705) |  |
Unrealized losses on securities available for sale transferred to held to maturity |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net interest income | [1] | (17,106) |  |  |  |
Income taxes | [1] | 3,934 |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [2] | 13,172 | [1] | 0 |  |
Defined Benefit Pension Items |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Employee Benefits, prior service costs | [1] | 79 |  | 210 |  |
Reclassification adjustment for losses included in income before income taxes | [1] | 13,902 |  | 9,510 |  |
Total before taxes |  | 13,981 |  | 9,720 | [1] |
Income taxes | [1] | 3,216 |  | 3,596 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | $ 10,765 |  | $ 6,124 |  |
[1] | Amounts in parentheses indicate debits to profit/loss.
[2] | All amounts are net of tax. Amounts in parentheses indicate debits.

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