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Note 4 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
   
(Dollars in thousands, except per share amounts)
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
61,163
     $
26,359
     $
117,283
     $
62,835
  
Less: distributed earnings allocated to participating securities
    
(68
 )    
(45
 )    
(196
 )    
(124
 )
Less: undistributed earnings allocated to participating securities
    
(244
 )    
(49
 )    
(375
 )    
(83
 )
Net income attributable to common stockholders (numerator for basic earnings per share)
    
60,851
      
26,265
      
116,712
      
62,628
  
Add back: undistributed earnings allocated to participating securities
    
244
      
49
      
375
      
83
  
Less: undistributed earnings reallocated to participating securities
    
(240
 )    
(49
 )    
(369
 )    
(83
 )
Numerator for diluted earnings per share under two class method
   $
60,855
     $
26,265
     $
116,718
     $
62,628
  
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted-average common shares outstanding
    
51,650,360
      
51,297,132
      
51,502,986
      
51,286,844
  
Add: dilutive effect of stock options
    
950,758
      
163,314
      
745,391
      
10,921
  
Denominator for diluted earnings per share under two class method
    
52,601,118
      
51,460,446
      
52,248,377
      
51,297,765
  
                                 
Basic Earnings Per Common Share
   $
1.18
     $
0.51
     $
2.27
     $
1.22
  
Diluted Earnings Per Common Share
   $
1.16
     $
0.51
     $
2.23
     $
1.22