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Earnings per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 1,259 $ 614 $ 3,800 $ 4,308
Denominator for basic net income per common share:        
Weighted average common shares outstanding (in shares) 12,709,000 12,579,000 12,678,000 12,542,000
Denominator for diluted net income per share:        
Weighted average common shares outstanding (in shares) 12,709,000 12,579,000 12,678,000 12,542,000
Dilutive effect of stock options and restricted stock (in shares) 227,000 251,000 209,000 232,000
Diluted weighted average shares (in shares) 12,936,000 12,830,000 12,887,000 12,774,000
Earnings per common share:        
Basic (in USD per share) $ 0.10 $ 0.05 $ 0.30 $ 0.34
Diluted (in USD per share) $ 0.10 $ 0.05 $ 0.29 $ 0.34
Number of shares not included in the computation of dilutive income per share (in shares) 107,500 52,500 107,500 107,500
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 dollars per share) $ 22.90 $ 30.41 $ 22.90 $ 22.90
Exercise price of shares not included in the computation of dilutive income per share, upper limit (in dollars per share) $ 33.36 $ 33.36 $ 33.36 $ 33.36