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Note 9 - Net Income Per Common Share (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Six Months Ended June 30,
   
Three Months Ended June 30,
 
(dollars and shares in thousands, except per share data)
 
2016
   
2015
   
2016
   
2015
 
Basic:
                               
Net income available to common shareholders
  $ 47,467     $ 39,997     $ 24,145     $ 20,759  
Average common shares outstanding
    33,554       32,231       33,588       33,367  
Basic net income per common share
  $ 1.41     $ 1.24     $ 0.72     $ 0.62  
                                 
Diluted:
                               
Net income available to common shareholders
  $ 47,467     $ 39,997     $ 24,145     $ 20,759  
Average common shares outstanding
    33,554       32,231       33,588       33,367  
Adjustment for common share equivalents
    592       664       595       631  
Average common shares outstanding-diluted
    34,146       32,895       34,183       33,998  
Diluted net income per common share
  $ 1.39     $ 1.22     $ 0.71     $ 0.61  
                                 
Anti-dilutive shares
    6.5       13.0       6.5       13.0