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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 | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items | [1] | $ (6,368) | $ (9,174)
Gains and Losses on Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification of unrealized gain or loss on cash flow hedges | [1] | 18,704 | (110)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | 9,238 | (12,833)
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 gain (loss) on securities transferred to HTM | [1] | 470 | (3,153)
Tax effect | [1] | (105) | 713
Net of tax | [1] | 365 | (2,440)
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 | [1] | 488 |
Tax effect | [1] | (109) |
Net of tax | [1] | 379 |
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax effect | [1] | 1,390 | 2,074
Net of tax | [1] | (4,978) | (7,100)
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] |  |  |
Tax effect | [1] | (4,182) | 25
Net of tax | [1] | 14,522 | (85)
Amortization of loss on terminated cash flow hedges | [1] | (1,353) | (4,145)
Tax effect | [1] | 303 | 937
Net of tax | [1] | $ (1,050) | $ (3,208)
[1] | Amounts in parentheses indicate reduction in net income.

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