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Note 2 - Mergers and Acquisitions (Details Textual) - USD ($)
 12 Months Ended
Oct. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination Weighted Average Grant Date Fair Value     $ 24.89
Business Combination, Acquisition Related Costs   $ 141,000   $ 4,699,000
Goodwill [1]   104,168,000 104,168,000    
Goodwill, Period Increase (Decrease)   [1] $ (257,000) [1] $ 257,000  
Virginia Heritage Bank [Member]          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 0.6632        
Convertible Stock Cash Received Per Share $ 7.50        
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination Weighted Average Grant Date Fair Value $ 401,497        
Payments to Acquire Businesses, Gross $ 45,400,000        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 4,010,261        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 914,000,000        
Loans Fair Value At Acquisition 800,000,000 804,000,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities 645,000,000        
Business Combination, Consideration Transferred $ 189,000,000        
Preferred Stock, Shares Outstanding 15,300        
Preferred Stock, Liquidation Preference Per Share $ 1,000        
Business Combination Shares Issued For Each Acquirees Share Converted 1        
Preferred Stock, Dividend Rate, Percentage 1.00%        
Business Combination, Acquisition Related Costs         $ 4,700,000
Goodwill $ 102,300,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 4,600,000        
Business Combination, Fair Value Credit Mark on Loan Portfolio $ 12,500,000        
Goodwill, Period Increase (Decrease)       $ (257,000)  
Virginia Heritage Bank [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life 1 year        
Virginia Heritage Bank [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life 5 years        
Virginia Heritage Bank [Member] | Core Deposits [Member]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 4,600,000 $ 2,600,000      
Finite-Lived Intangible Asset, Useful Life 4 years        
[1] The Company recorded an initial amount of unidentified intangible (goodwill) incident to the acquisition of Fidelity of approximately $360 thousand. Based on allowable adjustments through August 31, 2009, the unidentified intangible (goodwill) amounted to approximately $2.2 million. The Company recorded an initial amount of unidentified intangible (goodwill) incident to the acquisition of Virginia Heritage of approximately $102.3 million. Based on allowable adjustments through October 31, 2015, the unidentified intangible (goodwill) was reduced by $257 thousand.