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Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | $ 2,301 | $ (1,183)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Loss on sale of AFS securities | [1] | (1,707) |
Tax effect | [1] | 385 |
Net of tax | [1] | (1,322) |
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] | (261) | 56
Tax effect | [1] | 59 | (13)
Net of tax | [1] | (202) | 43
Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items | [1] | (1,209) | (1,954)
Tax effect | [1] | 273 | 439
Net of tax | [1] | (936) | (1,515)
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] | 3,875 | 6,136
Tax effect | [1] | (875) | (1,379)
Net of tax | [1] | 3,000 | 4,757
Amortization of gain (loss) on terminated cash flow hedges | [1] | 2,879 |
Tax effect | [1] | (650) |
Net of tax | [1] | 2,229 |
Gains and Losses on Equity Method Investment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification of unrealized loss on equity method investment | [1] | (468) | (4,468)
Net of tax | [1] | $ (468) | $ (4,468)
[1] | Amounts in parentheses indicate reduction in net income.

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