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Dividends and Basic Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 and 2017.

  
Three Months
Ended September 30,
  
Nine Months
Ended September 30,
 
(net income in thousands)
 
2018
  
2017
  
2018
  
2017
 
Net Income
 
$
12,000
  
$
8,581
  
$
32,491
  
$
24,589
 
Weighted Average Number of Common Shares Outstanding
  
793,418
   
810,291
   
807,129
   
809,002
 
Basic Earnings Per Common Share Amount
 
$
15.12
  
$
10.59
  
$
40.26
  
$
30.39