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Stock Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 194,521  
Options, Granted 0  
Options, Exercised (3,200)  
Options, Forfeited (1,000)  
Options, Outstanding, end of period 190,321 194,521
Options, Exercisable, end of period 175,821  
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 $ 25.80  
Weighted Average Exercise Price Per Share, Forfeited 29.08  
Weighted Average Exercise Price Per Share, Outstanding, end of period 26.91 $ 26.91
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 26.78  
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 5 years 3 months 18 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 8 years 8 months 12 days  
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 83  
Aggregate Intrinsic Value, Forfeited in Period 29  
Aggregate Intrinsic Value, Outstanding, end of period 164 $ 363
Aggregate Intrinsic Value, Exercisable at end of period $ 164