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Summary of Stock Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Years
$ / shares
shares
Dec. 31, 2017
USD ($)
Years
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options outstanding | shares 155,158 174,510
Options granted | shares 0  
Options exercised | shares (19,352)  
Options outstanding weighted average exercise price | $ / shares $ 28.81 $ 28.70
Options outstanding weighted average exercise price - Granted | $ / shares 27.88  
Options outstanding weighted average exercise price - Exercised | $ / shares $ 0  
Options outstanding weighted average remaining term | Years 5.5 6.0
Options outstanding weighted average grant date fair value | $ $ 1,680 $ 1,901
Options granted weighted average grant date fair value | $ 0  
Options exercised weighted average grant date fair value | $ $ (221)  
Options exercisable at June 30, 2018 | shares 138,693  
Options exerciseable weighted average exercise price | $ / shares $ 28.65  
Options exerciseable weighted average remaining term | Years 5.4  
Options vested weighted average grant date fair value | $ $ 454  
Options vested during six months ended June 30, 2018 | shares 138,693  
Options exercisable weighted average grant date fair value | $ $ 1,456