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Shareholders' Equity and Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Shareholders' Equity and Earnings Per Common Share [Abstract]  
Reconciliation of Basic and Diluted Net Income Per Share
A reconciliation of basic and diluted net income per common share follows:

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2019
  
2018
  
2019
  
2018
 
  
(In thousands, except per share data)
 
Net income
 
$
10,730
  
$
8,817
  
$
20,111
  
$
17,978
 
                 
Weighted average shares outstanding (1)
  
23,036
   
24,109
   
23,310
   
22,745
 
Stock units for deferred compensation plan for non-employee directors
  
128
   
126
   
130
   
125
 
Effect of stock options
  
112
   
224
   
119
   
179
 
Performance share units
  
37
   
51
   
39
   
50
 
Weighted average shares outstanding for calculation of diluted earnings per share
  
23,313
   
24,510
   
23,598
   
23,099
 
                 
Net income per common share
                
Basic (1)
 
$
0.47
  
$
0.37
  
$
0.86
  
$
0.79
 
Diluted
 
$
0.46
  
$
0.36
  
$
0.85
  
$
0.78
 
 
(1)Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.