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Investments (Gross Gains And Losses Realized) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments [Abstract]        
Gross realized gains $ 0 $ 2,722 $ 4,276 $ 3,978
Gross realized losses 0 (54) 0 (465)
Net investment security gains $ 0 $ 2,668 $ 4,276 $ 3,513