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Investments In Securities and Fair Value (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     $ 2,550 $ 1,385
Total, gross realized losses     (2,250) (188)
Net realized gains from securities     300 1,197
Gain on other investments     32 2
Losses on Other Assets and Investments     (5) 0
Total     27 2
Net realized investment gains $ 186 $ 423 327 1,199
Corporate debt securities        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     30 0
Common stocks        
Debt Securities, Available-for-sale [Line Items]        
Equity securities, realized gain     2,520 1,385
Equity securities, realized loss     (1,768) (188)
Other-than-temporary impairment of securities        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized losses     $ (482) $ 0