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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Balance $ 7,860,797 $ 8,340,736      
Current period change 490,709 (300,465) $ 57,123    
Balance 9,132,925 7,860,797 8,340,736    
URA(D) On Securities [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Balance (179,392) 49,969      
Current period change 485,261 (226,954)      
Change to beginning balance due to adoption of Accounting Standards Update 2016-01   (1,201)    
Balance 304,425 (179,392) 49,969    
URA(D) On Securities OTTI [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Current period change (1,444) (1,206)      
Foreign Currency Translation Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Balance (215,747) (138,931)      
Current period change 14,030 (76,816)      
Balance (201,717) (215,747) (138,931)    
Benefit Plan Net Gain (Loss) [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Balance (67,418) (71,929)      
Current period change (7,138) 4,511      
Balance (74,556) (67,418) (71,929)    
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Balance (462,557) (160,891) (216,764)    
Current period change 490,709 (300,465) 57,123    
Change to beginning balance due to adoption of Accounting Standards Update 2016-01   (1,201) $ (1,250) $ (1,250)
Balance $ 28,152 $ (462,557) $ (160,891)