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Dividends and Basic Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Dividends and Basic Earnings Per Common Share [Abstract]  
Calculation of Basic Earnings per Common Share
The following table calculates the basic earnings per common share for the periods indicated.

(net income in thousands)
 
2017
  
2016
  
2015
 
Net Income
 
$
28,370
  
$
29,723
  
$
27,392
 
Weighted Average Number of Common Shares Outstanding
  
809,834
   
793,970
   
786,582
 
Basic Earnings Per Common Share
 
$
35.03
  
$
37.44
  
$
34.82