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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net Earnings Available to Common Shareholders        
Basic earnings per share $ 2,493 $ 2,442 $ 7,445 $ 7,572
Effect of dilutive securities: Restricted stock units 0 0 0 0
Diluted earnings per share $ 2,493 $ 2,442 $ 7,445 $ 7,572
Common Shares        
Basic earnings per share (in shares) 5,534,581 5,617,125 5,573,743 5,615,556
Effect of dilutive securities: Restricted stock units (in shares) 52,861 27,599 45,466 24,173
Diluted earnings per share (in shares) 5,587,442 5,644,724 5,619,209 5,639,729
Per Share Amount        
Basic earnings per share $ 0.45 $ 0.43 $ 1.34 $ 1.35
Diluted earnings per share $ 0.45 $ 0.43 $ 1.32 $ 1.34