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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net earnings $ 1,440 $ 1,727
Weighted average common shares outstanding - basic (1) (in shares) 2,922,719 [1] 2,921,967 [1]
Assumed exercise of stock options (1) 48,462 [1] 12,108 [1]
Weighted average common shares outstanding - diluted (1) (in shares) 2,971,181 [1] 2,934,076 [1]
Net earnings per share (1):    
Basic (in dollars per share) $ 0.49 [1] $ 0.59 [1]
Diluted (in dollars per share) $ 0.48 [1] $ 0.59 [1]
[1] Share and per share values for the period ended March 31, 2012 have been adjusted to give effect to the 5% stock dividend paid during December 2012.