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Share Based Compensation (Summary Of Activity In Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding Options, Exercised 0 (1,400) (17,255) (1,600)
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 $ 1,745 $ 1,645 $ 1,745 $ 1,645
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term     7 years 4 months 28 days 6 years 7 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 112,989 109,324 112,989 109,324
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 1,063 $ 898 $ 1,063 $ 898
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term     5 years 7 months 2 days 5 years 6 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 16.32 $ 15.77 $ 16.32 $ 15.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding Options, Beginning Balance     232,091 250,291
Outstanding Options, Granted     138,125 0
Outstanding Options, Exercised     (31,413) (1,600)
Outstanding Options, Forfeited     0 (3,200)
Outstanding Options, Expired     0 0
Outstanding Options, Ending Balance 338,803 245,491 338,803 245,491
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]        
Outstanding, Weighted-Average Exercise Price, Beginning Balance     $ 17.36 $ 17.75
Outstanding, Weighted-Average Exercise Price, Granted     23.94 0.00
Outstanding, Weighted-Average Exercise Price, Exercised     11.83 17.79
Outstanding, Weighted-Average Exercise Price, Forfeited     0.00 25.50
Outstanding, Weighted-Average Exercise Price, Expired     0.00 0.00
Outstanding, Weighted-Average Exercise Price, Ending Balance $ 20.56 $ 17.65 $ 20.56 $ 17.65