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Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 9,726,176 $ 9,132,925  
Current period change (523,375) 506,746 $ 490,709
Balance 10,139,180 9,726,176 9,132,925
URA(D) On Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 724,159 304,425  
Current period change 484,762 (419,734)  
Balance 239,397 724,159 304,425
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (115,390) (201,717)  
Current period change (62,091) 86,327  
Balance (177,481) (115,390) (201,717)
Benefit Plan Net Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (73,870) (74,556)  
Current period change 23,478 685  
Balance (50,392) (73,870) (74,556)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 534,899 28,152 (462,557)
Current period change (523,375) 506,746 490,709
Balance $ 11,523 $ 534,899 $ 28,152