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Summary of Stock Activity (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Years
$ / shares
shares
Dec. 31, 2018
USD ($)
Years
$ / shares
shares
Share-based Payment Arrangement [Abstract]    
Options outstanding | shares 147,538 147,538
Options granted | shares 0  
Options exercised | shares 0  
Options outstanding weighted average exercise price | $ / shares $ 33.48 $ 33.48
Options outstanding weighted average exercise price - Granted | $ / shares 0  
Options outstanding weighted average exercise price - Exercised | $ / shares $ 0  
Options outstanding weighted average remaining term | Years 6.4 6.7
Options outstanding weighted average grant date fair value | $ $ 1,782 $ 1,782
Options granted weighted average grant date fair value | $ 0  
Options exercised weighted average grant date fair value | $ $ 0  
Options exercisable at March 31, 2019 | shares 119,714  
Options exerciseable weighted average exercise price | $ / shares $ 31.59  
Options exerciseable weighted average remaining term | Years 5.9  
Options vested weighted average grant date fair value | $ $ 0  
Options vested during three months ended March 31, 2019 | shares 0  
Options exercisable weighted average grant date fair value | $ $ 1,346