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Note 4 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2018
    
2017
    
2018
    
2017
  
   
(Dollars in thousands, except per share amounts)
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
53,392
     $
61,163
     $
156,055
     $
117,283
  
Less: distributed earnings allocated to participating securities
    
(106
 )    
(68
 )    
(307
 )    
(196
 )
Less: undistributed earnings allocated to participating securities
    
(222
 )    
(244
 )    
(613
 )    
(375
 )
Net income attributable to common stockholders (numerator for basic earnings per share)
    
53,064
      
60,851
      
155,135
      
116,712
  
Add back: undistributed earnings allocated to participating securities
    
222
      
244
      
613
      
375
  
Less: undistributed earnings reallocated to participating securities
    
(218
 )    
(240
 )    
(602
 )    
(369
 )
Numerator for diluted earnings per share under two class method
   $
53,068
     $
60,855
     $
155,146
     $
116,718
  
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted-average common shares outstanding
    
56,171,619
      
55,782,389
      
56,023,996
      
55,623,225
  
Add: dilutive effect of stock options
    
1,055,040
      
1,026,819
      
1,005,719
      
805,022
  
Denominator for diluted earnings per share under two class method
    
57,226,659
      
56,809,208
      
57,029,715
      
56,428,247
  
                                 
Basic Earnings Per Common Share
   $
0.94
     $
1.09
     $
2.77
     $
2.10
  
Diluted Earnings Per Common Share
   $
0.93
     $
1.07
     $
2.72
     $
2.07