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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, 2016
Dec. 31, 2015
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 194,521  
Options, Granted 0  
Options, Exercised (6,052)  
Options, Forfeited (16,019)  
Options, Outstanding, end of period 172,450 194,521
Options, Exercisable, end of period 157,950  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period $ 26.91  
Weighted Average Exercise Price Per Share, Granted  
Weighted Average Exercise Price Per Share, Exercised 26.37  
Weighted Average Exercise Price Per Share, Forfeited 27.71  
Weighted Average Exercise Price Per Share, Outstanding, end of period 26.85 $ 26.91
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 26.70  
Weighted Average Remaining Contractual Term, Outstanding 4 years 10 months 24 days 5 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 6 months  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 6 months  
Aggregate Intrinsic Value, Outstanding, beginning of period $ 363  
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 383 $ 363
Aggregate Intrinsic Value, Exercisable at end of period $ 375