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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee Benefit Plans [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of defined benefit pension and post-retirement items [1] $ (6,368) $ (9,174)
Gains and Losses on Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification of unrealized gain or loss on cash flow hedges [1] 18,704 (110)
Amount Reclassified from Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax [1] 9,238 (12,833)
Amount Reclassified from 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 gain (loss) on securities transferred to HTM [1] 470 (3,153)
Tax effect [1] (105) 713
Net of tax [1] 365 (2,440)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Gain on sale of AFS securities [1] 488  
Tax effect [1] (109)  
Net of tax [1] 379  
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Tax effect [1] 1,390 2,074
Net of tax [1] (4,978) (7,100)
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Tax effect [1] (4,182) 25
Net of tax [1] 14,522 (85)
Amortization of loss on terminated cash flow hedges [1] (1,353) (4,145)
Tax effect [1] 303 937
Net of tax [1] $ (1,050) $ (3,208)
[1] Amounts in parentheses indicate reduction in net income.