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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, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items | [1] | $ 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 | [1] | 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 | [2] | (4,579) | $ (3,631)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gain on sale of AFS securities | [2] |  | 1,435
Tax effect | [2] |  | (502)
Net of tax | [2] |  | 933
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 | [2] | (2,726) | (2,736)
Tax effect | [2] | 1,012 | 1,029
Net of tax | [2] | (1,714) | (1,707)
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 | [2],[3] | (4,144) | (4,395)
Tax effect | [2] | 1,491 | 1,538
Net of tax | [2] | (2,653) | $ (2,857)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of loss on terminated cash flash hedges | [2] | (335) |
Tax effect | [2] | 123 |
Net of tax | [2] | $ (212) |
[1] | For further discussion of the pension plan amendment, see Note 11 - Retirement Plans.
[2] | Amounts in parenthesis indicate reduction in net income.
[3] | 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 11 - Retirement Plans for additional details).

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