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Note 5 - Loans and Allowance for Credit Losses (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied and Construction [Member]            
Percent Of Loan Portfolio 13.00%     13.00%    
Commercial Real Estateand Real Estate Construction Loans [Member] | Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]            
Percent Of Loan Portfolio 61.00%     61.00%    
Commercial Real Estateand Real Estate Construction Loans [Member]            
Percent Of Loan Portfolio 74.00%     74.00%    
Commercial Portfolio Segment [Member] | S B A Loans [Member]            
Percent Of Loan Portfolio 2.50%     2.50%    
Commercial Portfolio Segment [Member] | Land Acquisition Development and Construction Loans [Member] | Maximum [Member]            
Loan Period       2 years    
Commercial Portfolio Segment [Member] | A D C Loans [Member]            
Financing Receivable, Net $ 942,800,000     $ 942,800,000    
Loan Percent 66.50%     66.50%    
Commercial Portfolio Segment [Member] | Maximum [Member] | Preferred Term [Member]            
Loan Period       7 years    
Commercial Portfolio Segment [Member] | Maximum [Member]            
Loan Period       10 years    
Amortization Term       25 years    
Commercial Portfolio Segment [Member] | Minimum [Member] | Preferred Term [Member]            
Loan Period       5 years    
Commercial Portfolio Segment [Member]            
Percent Of Loan Portfolio 21.00%     21.00%    
Financing Receivable, Net $ 1,130,042,000     $ 1,130,042,000   $ 1,052,257,000
Loan Percent 21.00%   21.00% 21.00% 21.00% 21.00%
Consumer Portfolio Segment [Member]            
Percent Of Loan Portfolio 2.00%     2.00%    
Residential Portfolio Segment [Member] | Real Estate Loan [Member]            
Percent Of Loan Portfolio 3.00%     3.00%    
Loan Period       1 year 300 days    
Residential Portfolio Segment [Member] | Land Acquisition Development and Construction Loans [Member] | Maximum [Member]            
Loan Period       3 years    
Residential Portfolio Segment [Member]            
Financing Receivable, Net $ 154,439,000     $ 154,439,000   $ 147,365,000
Loan Percent 3.00%   3.00% 3.00% 3.00% 3.00%
Maximum [Member]            
Loan To Value Ratio 80.00%     80.00%    
Loan Period       90 days    
Minimum [Member]            
Interest Rate Adjustment Frequency       5 years    
Loan Period       30 days    
Reclassified to Nonperforming Loans [Member] | Nonperforming Financial Instruments [Member]            
Financing Receivable, Modifications, Recorded Investment $ 5,000,000     $ 5,000,000    
Financing Receivable, Modifications, Number of Contracts       1 1  
Fidelity [Member] | Nonperforming Financial Instruments [Member]            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 495,000     $ 495,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 553,000     553,000    
Virginia Heritage Bank [Member] | Nonperforming Financial Instruments [Member]            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 1,100,000     1,100,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,200,000     2,200,000    
Performing Financial Instruments [Member]            
Financing Receivable, Modifications, Recorded Investment 2,900,000   $ 15,200,000 2,900,000 $ 15,200,000 $ 11,800,000
Loans and Leases Receivable, Deferred Income 20,900,000   $ 17,400,000 20,900,000 $ 17,400,000 18,400,000
Servicing Asset at Fair Value, Amount $ 113,400,000     $ 113,400,000   78,800,000
Minimum Debt Service Coverage 1.15%     1.15%    
Stress Test Assumption Increase Interest Rates 2.00%     2.00%    
Financing Receivable, Net $ 5,481,975,000     $ 5,481,975,000   $ 4,998,368,000
Loan Percent 100.00%   100.00% 100.00% 100.00% 100.00%
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 436,000     $ 1,300,000    
Impaired Financing Receivable, Interest Income, Accrual Method $ 97,000     271,000    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment       $ 5,000,000    
Financing Receivable, Modifications, Number of Contracts 1   3 3 4  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 801,000   $ 1,600,000 $ 1,400,000 $ 1,900,000  
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease)   $ 0        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       1 0