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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
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
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
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax [1] $ (22,994) (33,477)
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] (1,205) (1,279)
Tax effect [1] 289 268
Net of tax [1] (916) (1,011)
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] (2,623) (3,569)
Tax effect [1] 759 775
Net of tax [1] (1,864) (2,794)
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 loss on cash flow hedges [1] (21,594) (37,257)
Tax effect [1] 4,917 8,257
Net of tax [1] (16,677) (29,000)
Amortization of loss on terminated cash flow hedges [1] $ (4,580) $ (863)
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] $ 1,043 $ 191
Net of tax [1] $ (3,537) $ (672)
[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 13 – Retirement Plans for additional details).