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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Basic And Diluted Earning Per Share [Line Items]    
Net earnings $ 1,699 $ 1,440
Weighted average common shares outstanding - basic (in shares) 3,149,090 [1] 2,922,719 [1]
Assumed exercise of stock options 38,652 [1] 48,462 [1]
Weighted average common shares outstanding - diluted (in shares) 3,187,742 [1] 2,971,181 [1]
Net earnings per share :    
Basic (in dollars per share) $ 0.54 [2] $ 0.47 [2]
Diluted (in dollars per share) $ 0.53 [2] $ 0.46 [2]
[1] Share and per share values for the period ended March 31, 2013 have been adjusted to give effect to the 5% stock dividend paid during December 2013.
[2] Per share amounts for the period ended March 31, 2013 have been adjusted to give effect to the 5% stock dividend paid during December 2013.