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Note 15 - Net Income per Common Share (Tables)
12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

2015

   

2014

   

2013

 

(dollars and shares in thousands, except per share data)

                       

Basic:

                       

Net income available to common shareholders

  $ 83,566     $ 53,644     $ 46,441  

Average common shares outstanding

    32,836       26,684       25,726  

Basic net income per common share

  $ 2.54     $ 2.01     $ 1.81  
                         

Diluted:

                       

Net income available to common shareholders

  $ 83,566     $ 53,644     $ 46,441  

Average common shares outstanding

    32,836       26,684       25,726  

Adjustment for common share equivalents

    643       867       633  

Average common shares outstanding-diluted

    33,479       27,551       26,359  

Diluted net income per common share

  $ 2.50     $ 1.95     $ 1.76  
                         

Anti-dilutive shares

    5       13       35