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4. Net Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net Earnings Available to Common Shareholders        
Basic earnings $ 1,477 $ 1,161 $ 3,078 $ 2,471
Effect of dilutive securities: Stock options 0 0 0 0
Diluted earnings $ 1,477 $ 1,161 $ 3,078 $ 2,471
Common Shares        
Basic earnings per common share (in shares) 5,613,495 5,544,160 5,613,495 5,544,160
Effect of dilutive securities: Stock options (in shares) 5,589 3,928 5,185 1,964
Diluted earnings per common share (in shares) 5,619,084 5,548,088 5,618,680 5,546,124
Per Share Amount        
Basic earnings per common share (in dollars per share) $ 0.26 $ 0.21 $ 0.55 $ 0.45
Diluted earnings per common share (in dollars per share) $ 0.26 $ 0.21 $ 0.55 $ 0.45