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Stock-Based Compensation - Summary of Option Activity (Details) - Stock options
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Employee and Director Options  
Options outstanding, start of year (in shares) | shares 632,446
Options granted (in shares) | shares 0
Options exercised (in shares) | shares 0
Options expired / forfeited (in shares) | shares 0
Options outstanding, end of year (in shares) | shares 632,446
Options vested and exercisable (in shares) | shares 251,114
Weighted Average Exercise Price  
Options outstanding, start of year (in usd per share) | $ / shares $ 11.61
Options granted (in usd per share) | $ / shares 0.00
Options exercised (in usd per share) | $ / shares 0.00
Options expired / forfeited (in usd per share) | $ / shares 0.00
Options outstanding, end of year (in usd per share) | $ / shares 11.61
Options vested and exercisable, weighted average exercise price (in usd per share) | $ / shares $ 13.38
Options outstanding, intrinsic value | $ $ 167
Options exercisable, intrinsic value | $ $ 67
Options outstanding, weighted average remaining contractual term 2 years 8 months 1 day
Options exercisable, weighted average remaining contractual term 2 years 10 months 6 days