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Dividends and Basic Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2018
Dividends and Basic Earnings Per Common Share [Abstract]  
Calculation of Basic Earnings per Share
The following table calculates the basic earnings per common share for the three and six months ended June 30, 2018 and 2017.
 
  
Three Months
Ended June 30,
  
Six Months
Ended June 30,
 
(net income in thousands)
 
2018
  
2017
  
2018
  
2017
 
Net Income
 
$
10,550
  
$
8,187
  
$
20,491
  
$
16,008
 
Weighted Average Number of Common Shares Outstanding
  
817,893
   
808,704
   
815,114
   
808,347
 
Basic Earnings Per Common Share Amount
 
$
12.90
  
$
10.12
  
$
25.14
  
$
19.80