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Note 15 - Net Income Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
2016
 
 
2015
 
 
2014
 
(dollars and shares in thousands, except per share data)
 
 
 
 
 
 
 
 
 
 
 
 
Basic:
                        
Net income available to common shareholders
   $
97,707
    $
83,566
    $
53,644
 
Average common shares outstanding
    
33,587
      
32,836
      
26,684
  
Basic net income per common share
   $
2.91
    $
2.54
    $
2.01
 
                         
Diluted:
                        
Net income available to common shareholders
   $
97,707
    $
83,566
    $
53,644
 
Average common shares outstanding
    
33,587
      
32,836
      
26,684
  
Adjustment for common share equivalents
    
594
      
643
      
867
  
Average common shares outstanding-diluted
    
34,181
      
33,479
      
27,551
  
Diluted net income per common share
   $
2.86
    $
2.50
    $
1.95
 
                         
Anti-dilutive shares
    
7
     
5
     
13