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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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 9,726,176  
Current period change (299,820) $ (297,903)
Balance 9,682,882 8,580,944
URA(D) On Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 724,159 304,425
Balance 431,878 56,426
URA(D) On Securities OTTI [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Current period change (292,281) (247,999)
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (115,390) (201,717)
Current period change (9,582) (50,824)
Balance (124,972) (252,541)
Benefit Plan Net Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (73,870) (74,556)
Current period change 2,043 920
Balance (71,827) (73,636)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 534,899 28,152
Current period change (299,820) (297,903)
Balance $ 235,079 $ (269,751)