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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 9,132,925 $ 7,860,797  
Current period change 506,746 490,709 $ (300,465)
Balance 9,726,176 9,132,925 7,860,797
URA(D) On Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 304,425 (179,392)  
Current period change 419,734 485,261  
Balance 724,159 304,425 (179,392)
URA(D) On Securities OTTI [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Current period change (1,444)  
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (201,717) (215,747)  
Current period change 86,327 14,030  
Balance (115,390) (201,717) (215,747)
Benefit Plan Net Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (74,556) (67,418)  
Current period change 685 (7,138)  
Balance (73,870) (74,556) (67,418)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 28,152 (462,557) (160,891)
Current period change 506,746 490,709 (300,465)
Balance $ 534,899 $ 28,152 $ (462,557)