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Earnings per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income $ 1,509 $ 2,562 $ 5,309 $ 6,870
Denominator for basic net income per common share:        
Weighted average common shares outstanding (in shares) 12,717,000 12,586,000 12,691,000 12,557,000
Denominator for diluted net income per share:        
Weighted average common shares outstanding (in shares) 12,717,000 12,586,000 12,691,000 12,557,000
Dilutive effect of stock options and restricted stock (in shares) 245,000 215,000 222,000 226,000
Diluted weighted average shares (in shares) 12,962,000 12,801,000 12,913,000 12,783,000
Earnings per common share:        
Basic (in USD per share) $ 0.12 $ 0.20 $ 0.42 $ 0.55
Diluted (in USD per share) $ 0.12 $ 0.20 $ 0.41 $ 0.54
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of shares not included in the computation of dilutive income per share (in shares) 52,500 107,500 105,833 107,500
Antidilutive Effect        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Exercise price of shares not included in the computation of dilutive income per share, lower limit (in USD per share) $ 30.41 $ 22.90 $ 22.90 $ 22.90
Exercise price of shares not included in the computation of dilutive income per share, upper limit (in USD per share) $ 33.36 $ 33.36 $ 33.36 $ 33.36