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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 | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, net of tax | [1] | $ 7,656 |  | $ 6,363
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) |  | (2,166)
Tax effect | [1] | 385 |  | 487
Net of tax | [1] | (1,322) |  | (1,679)
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] | (961) |  | 134
Tax effect | [1] | 217 |  | (30)
Net of tax | [1] | (744) |  | 104
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] | (1,963) |  | (3,970)
Tax effect | [1] | 443 |  | 884
Net of tax | [1] | (1,520) |  | (3,086)
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] | 5,786 |  | 18,771
Tax effect | [1] | (1,306) |  | (4,188)
Net of tax | [1] | 4,480 |  | 14,583
Amortization of gain on terminated cash flow hedges |  | 8,733 | [1] | 1,170
Tax effect |  | (1,971) | [1] | (261)
Net of tax |  | $ 6,762 | [1] | 909
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] |  |  | (4,468)
Net of tax | [1] |  |  | $ (4,468)
[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 10 – Retirement Plans for additional details)

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