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Note 5 - Loans and Allowance for Credit Losses (Details Textual)
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jul. 24, 2015
USD ($)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied and Construction [Member]        
Percent Of Loan Portfolio 13.00%      
Commercial Real Estate Portfolio Segment [Member] | A D C Loans [Member]        
Financing Receivable, Net $ 1,120,000,000      
Loan Percent 45.40%      
Commercial Real Estateand Real Estate Construction Loans [Member] | Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]        
Percent Of Loan Portfolio 60.00%      
Commercial Real Estateand Real Estate Construction Loans [Member]        
Percent Of Loan Portfolio 73.00%      
Commercial Portfolio Segment [Member] | S B A Loans [Member]        
Percent Of Loan Portfolio 2.70%      
Commercial Portfolio Segment [Member] | Land Acquisition Development and Construction Loans [Member] | Maximum [Member]        
Loan Period 2 years      
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%      
Financing Receivable, Net $ 1,060,047,000   $ 1,052,257,000  
Loan Percent 21.00% 21.00% 21.00%  
Consumer Portfolio Segment [Member]        
Percent Of Loan Portfolio 3.00%      
Sale of Loan Receivable, Selling Price       $ 80,300,000
Sale of Loan Receivable, Estimated Loss       $ 879,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member]        
Percent Of Loan Portfolio 3.00%      
Loan Period 2 years 30 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 $ 149,159,000   $ 147,365,000  
Loan Percent 3.00% 3.00% 3.00%  
Maximum [Member]        
Loan To Value Ratio 80.00%      
Loan Period 7 years 180 days      
Minimum [Member]        
Interest Rate Adjustment Frequency 5 years      
Loan Period 2 years 180 days      
Reclassified to Nonperforming Loans [Member] | Nonperforming Financial Instruments [Member]        
Financing Receivable, Modifications, Recorded Investment $ 5,000,000      
Financing Receivable, Modifications, Number of Contracts 0 0    
Fidelity [Member] | Nonperforming Financial Instruments [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 504,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 561,000      
Virginia Heritage Bank [Member] | Nonperforming Financial Instruments [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 1,200,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 2,300,000      
Performing Financial Instruments [Member]        
Financing Receivable, Modifications, Recorded Investment 6,800,000 $ 13,400,000 $ 11,800,000  
Loans and Leases Receivable, Deferred Income 18,900,000 $ 15,800,000 18,400,000  
Servicing Asset at Fair Value, Amount $ 77,700,000   78,800,000  
Minimum Debt Service Coverage 1.15%      
Stress Test Assumption Increase Interest Rates 2.00%      
Financing Receivable, Net $ 5,155,871,000   $ 4,998,368,000  
Loan Percent 100.00% 100.00% 100.00%  
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease) $ 0      
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 335,000      
Impaired Financing Receivable, Interest Income, Accrual Method $ 74,000      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 1 0    
Financing Receivable, Modifications, Number of Contracts 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 5,000,000