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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]          
Carrying amount of goodwill $ 68,412   $ 68,412   $ 65,840
Amortization during the year $ 334 $ 288 $ 927 $ 876