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Shareholders' Equity and Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2018
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
March 31,
 
  
2018
  
2017
 
  
(In thousands, except
per share data)
 
Net income
 
$
9,161
  
$
5,974
 
         
Weighted average shares outstanding (1)
  
21,365
   
21,308
 
Effect of stock options
  
135
   
152
 
Stock units for deferred compensation plan for non-employee directors
  
125
   
119
 
Performance share units
  
49
   
60
 
Weighted average shares outstanding for calculation of diluted earnings per share
  
21,674
   
21,639
 
         
Net income per common share
        
Basic (1)
 
$
0.43
  
$
0.28
 
Diluted
 
$
0.42
  
$
0.28
 

(1)Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.