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Note 5 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended June 30,
    
Six months ended June 30,
  
(Dollars in thousands, except share and per share data)
  
2018
    
2017
    
2018
    
2017
  
Net income
   $
73,664
     $
51,415
     $
137,480
     $
100,356
  
                                 
Weighted-average shares:
                                
Basic weighted-average number of common shares outstanding
    
81,236,315
      
79,840,188
      
81,180,160
      
79,772,268
  
                                 
Dilutive effect of weighted-average outstanding common share equivalents
                                
Warrants
    
278,080
      
410,677
      
286,718
      
413,625
  
Options
    
-
      
24,169
      
-
      
29,002
  
Restricted stock units
    
260,591
      
287,573
      
261,099
      
273,410
  
Diluted weighted-average number of common shares outstanding
    
81,774,986
      
80,562,607
      
81,727,977
      
80,488,305
  
                                 
Average stock options and restricted stock units with anti-dilutive effect
    
6,521
      
-
      
22,624
      
9,895
  
Earnings per common share:
                                
Basic
   $
0.91
     $
0.64
     $
1.69
     $
1.26
  
Diluted
   $
0.90
     $
0.64
     $
1.68
     $
1.25