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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total, Gross realized gains $ 831 $ 164
Total, Gross realized losses (41) (11)
Net realized gains from securities 790 153
Gain on other investments 0 0
Total 0 0
Net realized investment gains 790 153
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 831 164
Equity Securities, Realized Loss (41) (11)
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