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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 | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  | $ (10,251) |
Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  | (10,251) |
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | 2,171 | $ (7,495)
Reclassification out of Accumulated Other Comprehensive Income | Held to Maturity Securities Transferred from AFS [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of unrealized net gain or loss or gain on securities transferred to HTM | [1] | 289 | (1,481)
Tax effect | [1] | (65) | 335
Net of tax | [1] | 224 | (1,146)
Reclassification out of Accumulated Other Comprehensive Income | 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] | (2,944) | (4,527)
Tax effect | [1] | 666 | 1,023
Net of tax | [1] | (2,278) | (3,504)
Reclassification out of Accumulated Other Comprehensive Income | 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] | 6,550 | (1,204)
Tax effect | [1] | (1,482) | 272
Net of tax | [1] | 5,068 | (932)
Amortization of loss on terminated cash flow hedges | [1] | (1,089) | (2,472)
Tax effect | [1] | 246 | 559
Net of tax | [1] | $ (843) | $ (1,913)
[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 other noninterest expense (see Note 12 – Retirement Plans for additional details).

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