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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2017
Earnings Per Common Share [Abstract]  
Reconciliation Of Earnings And Shares Used In Calculating Basic And Diluted EPS
    2017      2016     2015  
Net income available to common shareholders $ 32,064   $ 30,469   $ 26,875  
Weighted average common shares outstanding:                  
Total shares issued   15,235     14,689     14,398  
Unvested restricted stock awards   (47 )   (75 )   (93 )
Treasury shares   (144 )   (178 )   (224 )
Total basic weighted average common shares outstanding   15,044     14,436     14,081  
Incremental shares from assumed:                  
Exercise of stock options   9     20     24  
Vesting of restricted stock awards   32     35     30  
Total diluted weighted average common shares outstanding   15,085     14,491     14,135  
 
Basic earnings per common share  $ 2.13   $ 2.11   $ 1.91  
Diluted earnings per common share  $ 2.13   $ 2.10   $ 1.90  
Shares Excluded From Computation Of Diluted EPS
Stock options - - -
Restricted stock awards 1 2 1
Total 1 2 1