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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]        
Total, Gross realized gains     $ 952 $ 484
Total, Gross realized losses     (177) (47)
Net realized gains from securities     775 437
Gain on other investments     1 4
Total     1 4
Net realized investment gains $ (14) $ 288 776 441
Issuer Obligations Of U S States Territories And Political Subdivisions Special Revenue [Member]        
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 And Nonredeemable Preferred Stocks        
Debt Securities, Available-for-sale [Line Items]        
Equity Securities, Realized Gain     952 484
Equity Securities, Realized Loss     (177) (47)
General Obligations Of U.S. States, Territories And Political Subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Total, Gross realized losses     0 0
Impairments of Debt And Equity Securities [Member]        
Debt Securities, Available-for-sale [Line Items]        
Total, Gross realized losses     $ 0 $ 0