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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of defined benefit pension and post-retirement items |  | $ 17,315 |  | $ 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] |  | $ (4,403) | (3,083)
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] |  | (1,680) | (1,749)
Tax effect | [1] |  | 380 | 657
Net of tax | [1] |  | (1,300) | (1,092)
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] |  | (2,448) | (3,105)
Tax effect | [1] |  | 555 | 1,114
Net of tax | [1] |  | (1,893) | $ (1,991)
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] |  | 979 |
Tax effect | [1] |  | (222) |
Net of tax | [1] |  | 757 |
Amortization of loss on terminated cash flash hedges | [1] |  | (2,544) |
Tax effect | [1] |  | 577 |
Net of tax | [1] |  | $ (1,967) |
[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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