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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, 2017
Dec. 31, 2016
Stock-Based Compensation [Abstract]    
Options, Outstanding, beginning of period 160,429  
Options, Granted 0  
Options, Exercised (14,200)  
Options, Forfeited (1,000)  
Options, Outstanding, end of period 145,229 160,429
Options, Exercisable, end of period 129,229  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period $ 27.37  
Weighted Average Exercise Price Per Share, Granted  
Weighted Average Exercise Price Per Share, Exercised 26.85  
Weighted Average Exercise Price Per Share, Forfeited 28.55  
Weighted Average Exercise Price Per Share, Outstanding, end of period 27.42 $ 27.37
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 26.66  
Weighted Average Remaining Contractual Term, Outstanding 5 years 4 months 24 days 5 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 6 months  
Weighted Average Remaining Contractual Term, Forfeited During Period 8 years 9 months 18 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 10 months 24 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 1,969 $ 932
Aggregate Intrinsic Value, Exercisable at end of period $ 1,969