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Note 3 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the three months ended
June 30,
  For the six months ended
June 30,
    2018   2017   2018   2017
    (Dollars in thousands, except per share data)
Net income, as reported   $
13,923
    $
12,725
    $
25,335
    $
24,985
 
Divided by:                                
Weighted average common shares outstanding    
28,845
     
29,135
     
28,909
     
29,077
 
Weighted average common stock equivalents    
1
     
1
     
1
     
3
 
Total weighted average common shares outstanding and common stock equivalents    
28,846
     
29,136
     
28,910
     
29,080
 
                                 
Basic earnings per common share   $
0.48
    $
0.44
    $
0.88
    $
0.86
 
Diluted earnings per common share
(1)
  $
0.48
    $
0.44
    $
0.88
    $
0.86
 
Dividend payout ratio    
41.7
%    
40.9
%    
45.5
%    
41.9
%