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Note 3 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the three months ended 
 March 31,
(Dollars in thousands, except per share data)   2017   2016
         
Net income, as reported   $
12,260
    $
9,561
 
Divided by:                
Weighted average common shares outstanding    
29,019
     
29,097
 
Weighted average common stock equivalents    
4
     
14
 
Total weighted average common shares outstanding and common stock equivalents    
29,023
     
29,111
 
                 
Basic earnings per common share   $
0.42
    $
0.33
 
Diluted earnings per common share
(1)
  $
0.42
    $
0.33
 
Dividend payout ratio    
42.9
%    
51.5
%