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Note 4 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
 
  
June 30,
   
June 30,
 
 
  
2017
    
2016
    
2017
    
2016
  
 
  
(Dollars in thousands, except per share amounts)
  
Numerator
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income
 
$
33,871
 
 
$
26,913
 
 
$
56,120
 
 
$
36,476
 
Less: distributed earnings allocated to participating securities
 
 
(61
)
 
 
(39
)
 
 
(128
)
 
 
(79
)
Less: undistributed earnings allocated to participating securities
 
 
(98
)
 
 
(47
)
 
 
(140
)
 
 
(36
)
Net income attributable to common stockholders (numerator for basic earnings per share)
 
 
33,712
 
 
 
26,827
 
 
 
55,852
 
 
 
36,361
 
Add back: undistributed earnings allocated to participating securities
 
 
98
 
 
 
47
 
 
 
140
 
 
 
36
 
Less: undistributed earnings reallocated to participating securities
 
 
(96
)
 
 
(47
)
 
 
(138
)
 
 
(36
)
Numerator for diluted earnings per share under two class method
 
$
33,714
 
 
$
26,827
 
 
$
55,854
 
 
$
36,361
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
51,514,309
 
 
 
51,293,917
 
 
 
51,428,079
 
 
 
51,281,643
 
Add: dilutive effect of stock options
 
 
929,814
 
 
 
10,912
 
 
 
637,889
 
 
 
9,716
 
Denominator for diluted earnings per share under two class method
 
 
52,444,123
 
 
 
51,304,829
 
 
 
52,065,968
 
 
 
51,291,359
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic Earnings Per Common Share
 
$
0.65
 
 
$
0.52
 
 
$
1.09
 
 
$
0.71
 
Diluted Earnings Per Common Share
 
$
0.64
 
 
$
0.52
 
 
$
1.07
 
 
$
0.71