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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 | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  | $ 22,014 | $ (1,836)
Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items |  | 22,014 | (1,836)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | (10,858) | (7,762)
Reclassification out of 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 loss on securities transferred to HTM | [1] | (428) | (494)
Tax effect | [1] | 96 | 111
Net of tax | [1] | (332) | (383)
Reclassification out of Accumulated Other Comprehensive Income [Member] | 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] | (1,019) | (1,519)
Tax effect | [1] | 229 | 340
Net of tax | [1] | (790) | (1,179)
Reclassification out of Accumulated Other Comprehensive Income [Member] | 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] | (12,658) | (10,629)
Tax effect | [1] | 2,844 | 2,393
Net of tax | [1] | (9,814) | (8,236)
Amortization of gain on terminated cash flow hedges | [1] | $ 100 | $ 2,628
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Interest and Dividend Income, Operating | Interest and Dividend Income, Operating
Tax effect | [1] | $ (22) | $ (592)
Net of tax | [1] | $ 78 | $ 2,036
[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 11 – Retirement Plans for additional details).

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