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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Aug. 31, 2009
Aug. 31, 2008
Amortization of Intangible Assets $ 1,700 $ 1,500   $ 743      
Goodwill [1] 104,168 104,168          
Goodwill, Period Increase (Decrease) [1] (257) [1] $ 257        
Core Deposits [Member]              
Amortization of Intangible Assets 1,200 1,200          
Finite-Lived Intangible Assets, Net 2,779 $ 3,986          
Fidelity [Member]              
Goodwill           $ 2,200 $ 360
Fidelity [Member] | Core Deposits [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 209           $ 2,300
Virginia Heritage Bank [Member]              
Goodwill         $ 102,300    
Goodwill, Period Increase (Decrease)     $ (257)        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles         4,600    
Virginia Heritage Bank [Member] | Core Deposits [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 2,600       $ 4,600    
[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.