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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 | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  |  | $ 17,315
Employee Benefit Plans [Member] |  |  |
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] | $ (6,951) | (4,579)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Held to Maturity 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] | (2,427) | (2,726)
Tax effect | [1] | 550 | 1,012
Net of tax | [1] | (1,877) | (1,714)
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],[2] | (3,719) | (4,144)
Tax effect | [1] | 842 | 1,491
Net of tax | [1] | (2,877) | (2,653)
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] | 1,264 |
Tax effect | [1] | (286) |
Net of tax | [1] | 978 |
Amortization of loss on terminated cash flash hedges | [1] | (4,105) | (335)
Tax effect | [1] | 930 | 123
Net of tax | [1] | $ (3,175) | $ (212)
[1] | Amounts in parentheses indicate reduction in net income.
[2] | These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 12 - Retirement Plans for additional details).

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