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Earnings per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income $ 2,541 $ 3,694
Denominator for basic net income per common share:    
Weighted average common shares outstanding (in shares) 12,648,000 12,504,000
Denominator for diluted net income per share:    
Weighted average common shares outstanding (in shares) 12,648,000 12,504,000
Dilutive effect of stock options and restricted stock (in shares) 190,000 209,000
Diluted weighted average shares (in shares) 12,838,000 12,713,000
Earnings per common share:    
Basic (in USD per share) $ 0.20 $ 0.30
Diluted (in USD per share) $ 0.20 $ 0.29
Number of shares not included in the computation of dilutive income per share 187,500 136,500
Antidilutive Effect [Member]    
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) $ 19.61 $ 19.90
Exercise price of shares not included in the computation of dilutive income per share, upper limit (in dollars per share) $ 33.36 $ 33.36