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Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - Amount Reclassified from Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | $ (7,495) | $ (4,403)
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] | (1,481) | (1,680)
Tax effect | [1] | 335 | 380
Net of tax | [1] | (1,146) | (1,300)
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] | (4,527) | (2,448)
Tax effect | [1] | 1,023 | 555
Net of tax | [1] | (3,504) | (1,893)
Gains and Losses on Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification of unrealized gain (loss) on cash flow hedges | [1] | (1,204) | 979
Tax effect | [1] | 272 | (222)
Net of tax | [1] | (932) | 757
Amortization of loss on terminated cash flow hedges | [1] | (2,472) | (2,544)
Tax effect | [1] | 559 | 577
Net of tax | [1] | $ (1,913) | $ (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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