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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Reconciliation Of Basic And Diluted Earnings Per Share
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2016   2015   2016   2015
 
Net income $ 3,632 $ 3,931 $ 12,349 $ 11,685
 
Weighted average common                
shares outstanding                
Basic   6,042,384   5,991,073   6,024,365   5,972,927
Effect of dilutive employee stock options   65,408   75,757   67,339   81,667
Diluted   6,107,792   6,066,830   6,091,704   6,054,594
 
Anti-dilutive options excluded from                
earnings per share calculation   67,884   64,763   71,690   66,960
 
Per Common Share Data:                
Basic earnings per share $ 0.60 $ 0.66 $ 2.05 $ 1.96
Diluted earnings per share $ 0.59 $ 0.65 $ 2.03 $ 1.93