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Note 15 - Regulatory Capital (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure Text Block [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
  June 30, 2015   December 31, 2014
 
 		 Amount   Percent of
Assets		  
 		  
Amount		  
 		 Percent of
Assets
  (Dollars in thousands)
Tier I (leverage) capital:                                
Capital level   $ 483,407       9.13 %   $ 472,251       9.63 %
Requirement to be well capitalized     264,746       5.00       245,254       5.00  
Excess     218,661       4.13       226,997       4.63  
Common Equity Tier I risk-based capital:                                
Capital level   $ 483,407       13.07 %      n/a         n/a   
Requirement to be well capitalized     240,326       6.50        n/a         n/a   
Excess     243,081       6.57        n/a         n/a   
Tier 1 risk-based capital:                                
Capital level   $ 483,407       13.07 %   $ 472,251       13.87 %
Requirement to be well capitalized     295,786       8.00       204,345       6.00  
Excess     187,621       5.07       267,906       7.87  
Total risk-based capital:                                
Capital level   $ 506,491       13.70 %   $ 497,347       14.60 %
Requirement to be well capitalized     369,732       10.00       340,589       10.00  
Excess     136,759       3.70       156,758       4.60  
 

June 30, 2015

   December 31, 2014
  Amount  

Percent of

Assets

   Amount  

Percent of

Assets
  (Dollars in thousands)
Tier I (leverage) capital:                                
Capital level   $ 478,658       9.06 %   $ 471,233       9.62 %
Requirement to be well capitalized     264,295       5.00       244,960       5.00  
Excess     214,363       4.06       226,273       4.62  
Common Equity Tier I risk-based capital:                                
Capital level   $ 450,169       12.20 %      n/a         n/a   
Requirement to be well capitalized     239,927       6.50        n/a         n/a   
Excess     210,242       5.70        n/a         n/a   
Tier 1 risk-based capital:                                
Capital level   $ 478,658       12.97 %   $ 471,233       13.87 %
Requirement to be well capitalized     295,295       8.00       203,878       6.00  
Excess     183,363       4.97       267,355       7.87  
Total risk-based capital:                                
Capital level   $ 501,742       13.59 %   $ 496,329       14.61 %
Requirement to be well capitalized     369,119       10.00       339,797       10.00  
Excess     132,623       3.59       156,532       4.61