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Earnings per share (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
    2015     2014  

For the three months ended March 31

  Basic     Diluted     Basic     Diluted  

Net Income (Numerator)

  $ 5,044      $ 5,044      $ 4,698      $ 4,698   

Average common shares outstanding (Denominator)

    7,548,358        7,548,358        7,550,253        7,580,480   

Earnings per share

  $ 0.67      $ 0.67      $ 0.62      $ 0.62