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Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  |  | $ 17,315
Amount Reclassified from Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | $ (30,468) | (6,064)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gain (loss) on sale of AFS securities | [1] | (25,480) |
Tax effect | [1] | 5,720 |
Net of tax | [1] | (19,760) |
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | HTM Securities Transferred from AFS [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of unrealized net loss on securities transferred to HTM | [1] | (3,296) | (3,786)
Tax effect | [1] | 755 | 1,393
Net of tax | [1] | (2,541) | (2,393)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items | [1] | (4,989) | (5,201)
Tax effect | [1] | 1,122 | 1,898
Net of tax | [1] | (3,867) | (3,303)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification of unrealized gain on cash flow hedges | [1] | 1,072 |
Tax effect | [1] | (244) |
Net of tax | [1] | 828 |
Amortization of loss on terminated cash flash hedges | [1] | (5,569) | (600)
Tax effect | [1] | 1,269 | 232
Net of tax | [1] | $ (4,300) | $ (368)
[1] | Amounts in parenthesis indicate reduction in net income.

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