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Note 14 - Regulatory Capital (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
    December 31, 2016   December 31, 2015
        Percent of       Percent of
    Amount   Assets   Amount   Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $
607,033
     
10.12
%   $
494,690
     
8.89
%
Requirement to be well capitalized    
299,848
     
5.00
     
278,175
     
5.00
 
Excess    
307,185
     
5.12
     
216,515
     
3.89
 
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $
607,033
     
14.12
%   $
494,690
     
12.62
%
Requirement to be well capitalized    
279,443
     
6.50
     
254,768
     
6.50
 
Excess    
327,590
     
7.62
     
239,922
     
6.12
 
                                 
Tier I risk-based capital:                                
Capital level   $
607,033
     
14.12
%   $
494,690
     
12.62
%
Requirement to be well capitalized    
343,930
     
8.00
     
313,560
     
8.00
 
Excess    
263,103
     
6.12
     
181,130
     
4.62
 
                                 
Total risk-based capital:                                
Capital level   $
629,262
     
14.64
%   $
516,226
     
13.17
%
Requirement to be well capitalized    
429,913
     
10.00
     
391,950
     
10.00
 
Excess    
199,349
     
4.64
     
124,276
     
3.17
 
    December 31, 2016   December 31, 2015
        Percent of       Percent of
    Amount   Assets   Amount   Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $
539,228
     
9.00
%   $
490,919
     
8.84
%
Requirement to be well capitalized    
299,654
     
5.00
     
277,611
     
5.00
 
Excess    
239,574
     
4.00
     
213,308
     
3.84
 
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $
506,432
     
11.79
%   $
462,883
     
11.83
%
Requirement to be well capitalized    
279,121
     
6.50
     
254,335
     
6.50
 
Excess    
227,311
     
5.29
     
208,548
     
5.33
 
                                 
Tier I risk-based capital:                                
Capital level   $
539,228
     
12.56
%   $
490,919
     
12.55
%
Requirement to be well capitalized    
343,534
     
8.00
     
313,028
     
8.00
 
Excess    
195,694
     
4.56
     
177,891
     
4.55
 
                                 
Total risk-based capital:                                
Capital level   $
636,457
     
14.82
%   $
512,454
     
13.10
%
Requirement to be well capitalized    
429,417
     
10.00
     
391,285
     
10.00
 
Excess    
207,040
     
4.82
     
121,169
     
3.10