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Note 2 - Mergers and Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 31, 2014
Oct. 01, 2011
Dec. 31, 2015
Oct. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination (in Shares)     0   401,497 0
Preferred Stock, Shares Outstanding (in Shares) 15,300          
Business Combination, Acquisition Related Costs     $ 141   $ 4,699  
Goodwill, Period Increase (Decrease)       $ (257)    
Series C Preferred Stock [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Preferred Stock, Shares Outstanding (in Shares)     0   15,300  
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) $ 1,000   $ 1,000   $ 1,000  
Preferred Stock, Dividend Rate, Percentage 1.00%          
Series B Preferred Stock [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Preferred Stock, Shares Outstanding (in Shares)     0   56,600  
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) $ 1,000   $ 1,000   $ 1,000  
Preferred Stock, Dividend Rate, Percentage   1.00%        
Virginia Heritage Bank [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Goodwill $ 102,300          
Virginia Heritage Bank [Member] | Series A Preferred Stock [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Preferred Stock, Shares Outstanding (in Shares) 15,300          
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) $ 1,000          
Virginia Heritage Bank [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares) 0.6632          
Convertible Stock Cash Received Per Share (in Dollars per share) $ 7.50          
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination (in Shares) 401,497          
Payments to Acquire Businesses, Gross $ 45,400          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) 4,010,261          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 914,000          
Loans Fair Value At Acquisition 800,000   $ 804,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities 645,000          
Business Combination, Consideration Transferred 189,000          
Business Combination, Acquisition Related Costs     4,700      
Goodwill 102,300          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 4,600          
Goodwill, Period Increase (Decrease)       $ (257)    
Virginia Heritage Bank [Member] | Series C Preferred Stock [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Business Combination Shares Issued For Each Acquirees Share Converted (in Shares) 1          
Minimum [Member] | Virginia Heritage Bank [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Property, Plant and Equipment, Useful Life 1 year          
Maximum [Member] | Virginia Heritage Bank [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Property, Plant and Equipment, Useful Life 5 years          
Core Deposits [Member] | Virginia Heritage Bank [Member]            
Note 2 - Mergers and Acquisitions (Details) [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 4,600   $ 3,500      
Finite-Lived Intangible Asset, Useful Life 5 years