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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, 2026
Mar. 31, 2025
Employee Benefit Plans [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of defined benefit pension and post-retirement items $ (496)  
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax [1] (81,336) $ (7,371)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loss on sale of AFS securities [1] (98,595) 0
Tax effect [1] 22,222 0
Net of tax [1] (76,373)  
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] (413) (405)
Tax effect [1] 93 109
Net of tax [1] (320) (296)
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] (17) (955)
Tax effect [1] 4 384
Net of tax [1] (13) (571)
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] (4,470) (6,950)
Tax effect [1] 1,009 1,607
Net of tax [1] (3,461) (5,343)
Amortization of loss on terminated cash flow hedges [1] $ (1,510) $ (1,510)
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] $ 341 $ 349
Net of tax [1] $ (1,169) $ (1,161)
[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 12 – Retirement Plans for additional details).