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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (54,724) $ (180,709) $ (134,402)
Net change in unrealized gain (loss) 224,337 143,922 (52,757)
Reclassification of net gain (loss) realized and included in earnings (10,983) 13,429 34,966
Other valuation adjustments for employee benefit plans (37,451) 2,398 (45,198)
Amortization of unrealized net loss on securities transferred to held to maturity (470) 3,153 3,296
Income tax expense (benefit) 40,640 36,917 (13,386)
Ending Balance 80,069 (54,724) (180,709)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 28,950 (50,125) (29,512)
Net change in unrealized gain (loss) 183,441 115,413 (52,060)
Reclassification of net gain (loss) realized and included in earnings     25,480
Income tax expense (benefit) 41,167 23,102 (5,967)
Ending Balance 171,224 28,950 (50,125)
Unrealized loss on securities transferred to available for sale   (13,236)  
Held to Maturity Securities Transferred from AFS [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 639 (12,044) (14,585)
Amortization of unrealized net loss on securities transferred to held to maturity (470) 3,153 3,296
Income tax expense (benefit) (107) 3,706 755
Ending Balance 276 639 (12,044)
Unrealized loss on securities transferred to available for sale   13,236  
Employee Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (101,278) (110,247) (79,078)
Reclassification of net gain (loss) realized and included in earnings 6,368 9,174 4,989
Other valuation adjustments for employee benefit plans (37,451) 2,398 (45,198)
Income tax expense (benefit) (6,788) 2,603 (9,040)
Ending Balance (125,573) (101,278) (110,247)
Gains and Losses on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 17,399 (8,293) (11,227)
Net change in unrealized gain (loss) 45,831 28,943 (697)
Reclassification of net gain (loss) realized and included in earnings (17,351) 4,255 4,497
Income tax expense (benefit) 6,368 7,506 866
Ending Balance 39,511 17,399 $ (8,293)
Equity Method Investment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (434)    
Net change in unrealized gain (loss) (4,935) (434)  
Ending Balance $ (5,369) $ (434)