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Share Based Compensation (Summary Of Activity In Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding Options, Exercised (200) (2,000)
Employee Stock Option and Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 1,918 $ 1,812
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 7 years 29 days 7 years 7 months 10 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 77,581 82,483
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 618 $ 541
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term 5 years 6 months 4 years 5 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 17.42 $ 16.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding Options, Beginning Balance 250,291 217,857
Outstanding Options, Granted 0 87,615
Outstanding Options, Exercised (200) (2,000)
Outstanding Options, Forfeited (3,000) 0
Outstanding Options, Expired 0 0
Outstanding Options, Ending Balance 247,091 303,472
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, Weighted-Average Exercise Price, Beginning Balance $ 17.75 $ 13.56
Outstanding, Weighted-Average Exercise Price, Granted 0.00 26.01
Outstanding, Weighted-Average Exercise Price, Exercised 17.79 6.21
Outstanding, Weighted-Average Exercise Price, Forfeited 26.01 0
Outstanding, Weighted-Average Exercise Price, Expired 0.00 0.00
Outstanding, Weighted-Average Exercise Price, Ending Balance $ 17.65 $ 17.20