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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 225,669  
Options, Granted 0  
Options, Exercised (28,950)  
Options, Forfeited (1,000)  
Options, Outstanding, end of period 195,719 225,669
Options, Exercisable, end of period 171,719  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period $ 19.46  
Weighted Average Exercise Price Per Share, Granted  
Weighted Average Exercise Price Per Share, Exercised 26.46  
Weighted Average Exercise Price Per Share, Forfeited 28.55  
Weighted Average Exercise Price Per Share, Outstanding, end of period 18.38 $ 19.46
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 17.82  
Weighted Average Remaining Contractual Term, Outstanding 5 years 2 months 12 days 5 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercised During Period 3 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 8 years 2 months 12 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding, beginning of period $ 932  
Aggregate Intrinsic Value, Granted in Period 0  
Aggregate Intrinsic Value, Exercised in Period 0  
Aggregate Intrinsic Value, Forfeited in Period 0  
Aggregate Intrinsic Value, Outstanding, end of period 2,377 $ 932
Aggregate Intrinsic Value, Exercisable at end of period $ 2,181