Note 1 - Organization and Operations (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2016
USD ($)
shares
Aug. 31, 2010
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
$ / shares
May 30, 2014
Oct. 31, 2012
Nov. 30, 2011
Stock Issued During Period, Value, New Issues   $ 150,000 $ 61,323        
First Capital Bancorp [Member]              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 8,376,094            
Payments to Acquire Businesses, Gross $ 25,834            
Business Acquisition, Share Price | $ / shares       $ 7.32      
Business Combination, Consideration Transferred $ 87,147            
Provident Community Bancshares, Inc. [Member]              
Number of Branches         9    
Citizens South Banking Corporation [Member]              
Number of Branches           21  
Community Capital Corporation [Member]              
Number of Branches             18