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Stock-Based Compensation Plan - Restricted stock (Details) - Restricted stock
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Weighted Average Grant Date Fair Value  
Unrecognized compensation cost | $ $ 689
Weighted-average recognition period (in months) 29 months
Amended and Restated 2008 Option Plan  
Number of Shares  
Balance at the beginning of the year (in shares) | shares 50,629
Granted (in shares) | shares 1,000
Forfeited (in shares) | shares (2,750)
Balance at the end of the year (in shares) | shares 48,879
Weighted Average Grant Date Fair Value  
Outstanding at the beginning of the year (in dollars per share) | $ / shares $ 17.57
Granted (in dollars per share) | $ / shares 17.25
Forfeited (in dollars per share) | $ / shares 18.68
Outstanding at the end of the year (in dollars per share) | $ / shares $ 17.50