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Stock-Based Compensation (Restricted Stock Activity) (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares        
Outstanding, Beginning Balance (in shares) 139,451 145,588 99,238  
Granted (in shares) 126,432 139,451 145,558  
Vested (in shares) (81,494) (145,558) (99,238)  
Canceled/Forfeited (in shares) 0 0 0  
Outstanding, Ending Balance (in shares) 184,389 139,451 145,588 99,238
Weighted Average Exercise Price        
Outstanding, Beginning Balance (in dollars per share) $ 21.34 $ 19.17 $ 28.22  
Granted (in dollars per share) 27.06 21.34 19.17  
Vested (in dollars per share) 21.20 19.17 28.22  
Canceled/Forfeited (in dollars per share) 0.00 0.00 0.00  
Outstanding, Ending Balance (in dollars per share) $ 25.32 $ 21.34 $ 19.17 $ 28.22
Weighted Average Remaining Contractual Life (years)        
Weighted Average Remaining Contractual Life (years) 8 years 8 months 60 days 9 years 1 month 18 days 9 years 1 month 12 days 9 years
Aggregate Intrinsic Value (in thousands)        
Aggregate Intrinsic Value, Outstanding $ 4,831 $ 4,483 $ 3,246 $ 2,286
Aggregate Intrinsic Value, Granted 3,421 3,007 2,886  
Aggregate Intrinsic Value, Vested $ 2,361 $ 2,963 $ 2,100