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Earnings per share ("EPS") (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Reconciliation of Basic EPS and Diluted EPS
The following table is a reconciliation of basic EPS and diluted EPS.
 
  Three Months Ended
June 30,		  Six Months Ended
June 30,		 
(in thousands except share and per share data) 
2019
  2018  
2019
  2018 
Basic EPS Computation:
                
Numerator:
                
Net income, Class A
 
$
7,460
  $7,076  
$
14,867
  $13,138 
Net income, Class B
  
2,006
   1,922   
4,017
   3,569 
Denominator:
                
Weighted average shares outstanding, Class A
  
3,620,449
   3,608,029   
3,615,389
   3,608,029 
Weighted average shares outstanding, Class B
  
1,947,460
   1,959,880   
1,952,520
   1,959,880 
Basic EPS, Class A
 
$
2.06
  $1.96  
$
4.11
  $3.64 
Basic EPS, Class B
  
1.03
   0.98   
2.06
   1.82 
  
 
 
  
 
 
  
 
 
  
 
 
 
     
Diluted EPS Computation:
                
Numerator:
                
Net income, Class A
 
$
7,460
  $7,076  
$
14,867
  $13,138 
Net income, Class B
  
2,006
   1,922   
4,017
   3,569 
  
 
 
  
 
 
  
 
 
  
 
 
 
Total net income, for diluted EPS, Class A computation
  
9,466
   8,998   
18,884
   16,707 
Denominator:
                
Weighted average shares outstanding, basic, Class A
  
3,620,449
   3,608,029   
3,615,389
   3,608,029 
Weighted average shares outstanding, Class B
  
1,947,460
   1,959,880   
1,952,520
   1,959,880 
  
 
 
  
 
 
  
 
 
  
 
 
 
Weighted average shares outstanding diluted, Class A
  
5,567,909
   5,567,909   
5,567,909
   5,567,909 
Weighted average shares outstanding, Class B
  
1,947,460
   1,959,880   
1,952,520
   1,959,880 
Diluted EPS, Class A
 
$
1.70
  $1.62  
$
3.39
  $3.00 
Diluted EPS, Class B
  
1.03
   0.98   
2.06
   1.82