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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     $ 1,604 $ 952
Total, gross realized losses     (1,490) (177)
Net realized gains from securities     114 775
Gain on other investments     32 1
Losses on Other Assets and Investments     (5) 0
Total     27 1
Net realized investment gains $ 553 $ (14) 141 776
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     1,574 952
Equity securities, realized loss     (1,008) (177)
Other-than-temporary impairment of securities        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized losses     $ (482) $ 0