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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     $ 1,385 $ 688
Total, gross realized losses     (188) (63)
Net realized gains from securities     1,197 625
Gain on other investments     2 4
Total     2 4
Net realized investment gains $ 423 $ 188 1,199 629
Special revenue issuer obligations of U.S. states, territories and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     0 0
Total, gross realized losses     0 0
Corporate debt securities        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized gains     0 0
Common stocks        
Debt Securities, Available-for-sale [Line Items]        
Equity securities, realized gain     1,385 688
Equity securities, realized loss     (188) (63)
General obligations of U.S. states, territories and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized losses     0 0
Other-than-temporary impairment of securities        
Debt Securities, Available-for-sale [Line Items]        
Total, gross realized losses     $ 0 $ 0