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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Reconciliation Of Basic And Diluted Earnings Per Share
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2015   2014   2015   2014
 
Net income $ 3,931 $ 3,867 $ 11,685 $ 11,511
 
Weighted average common shares outstanding                
Basic   5,991,073   5,931,342   5,972,927 5,921,427 
Effect of dilutive employee stock options   75,757   52,581   81,667   44,147
Diluted   6,066,830   5,983,923   6,054,594 5,965,574 
 
Anti-dilutive options excluded from                
earnings per share calculation   64,763   41,256   66,960   85,431
 
Per Common Share Data:                
Basic earnings per share $ 0.66 $ 0.65 $ 1.96 $ 1.94
Diluted earnings per share $ 0.65 $ 0.65 $ 1.93 $ 1.93