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Note 5 - Loans and Allowance for Credit Losses (Details Textual)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 24, 2015
USD ($)
Oct. 31, 2014
USD ($)
Loans and Leases Receivable, Deferred Income $ 22,300,000 $ 18,400,000 $ 22,300,000 $ 18,400,000    
Sale of Loan Receivable, Selling Price         $ 80,300,000  
Sale of Loan Receivable, Estimated Loss         $ 900,000  
Servicing Asset at Fair Value, Amount $ 128,800,000 78,800,000 $ 128,800,000 78,800,000    
Minimum Debt Service Coverage 1.15%   1.15%      
Stress Test Assumption Increase Interest Rates 2.00%   2.00%      
Financing Receivable, Net $ 5,677,893,000 4,998,368,000 $ 5,677,893,000 4,998,368,000    
Financing Receivable, Modifications, Recorded Investment $ 8,900,000 $ 12,100,000 8,900,000 $ 12,100,000    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans     1,200,000      
Impaired Financing Receivable, Interest Income, Accrual Method     $ 48,000      
Financing Receivable, Modifications, Number of Contracts 10 8 4 4    
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 2,200,000 $ 1,900,000    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     2 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 5,200,000      
Performing Financial Instruments [Member]            
Financing Receivable, Modifications, Recorded Investment $ 3,500,000 $ 11,800,000 $ 3,500,000 $ 11,800,000    
Financing Receivable, Modifications, Number of Contracts 7          
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      
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied and Construction [Member]            
Percent Of Loan Portfolio 14.00%   14.00%      
Commercial Real Estateand Real Estate Construction Loans [Member]            
Percent Of Loan Portfolio 74.00%   74.00%      
Commercial Portfolio Segment [Member]            
Percent Of Loan Portfolio 21.00%   21.00%      
Financing Receivable, Net $ 1,200,728,000 1,052,257,000 $ 1,200,728,000 1,052,257,000    
Commercial Portfolio Segment [Member] | Maximum [Member]            
Loan Period     10 years      
Amortization Term     25 years      
Commercial Portfolio Segment [Member] | S B A Loans [Member]            
Percent Of Loan Portfolio 2.00%   2.00%      
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]            
Percent Of Loan Portfolio 67.00%   67.00%      
Financing Receivable, Net $ 1,060,000   $ 1,060,000      
Consumer Portfolio Segment [Member]            
Percent Of Loan Portfolio 2.00%   2.00%      
Residential Portfolio Segment [Member]            
Financing Receivable, Net $ 152,748,000 147,365,000 $ 152,748,000 $ 147,365,000    
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      
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]            
Percent Of Loan Portfolio 60.00%   60.00%      
Preferred Term [Member] | Commercial Portfolio Segment [Member] | Maximum [Member]            
Loan Period     7 years      
Preferred Term [Member] | Commercial Portfolio Segment [Member] | Minimum [Member]            
Loan Period     5 years      
Reclassified to Nonperforming Loans [Member] | Nonperforming Financial Instruments [Member]            
Financing Receivable, Modifications, Number of Contracts     2 0    
Virginia Heritage Bank [Member]            
Loans Fair Value At Acquisition $ 804,000,000   $ 804,000,000     $ 800,000,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value 3,000,000   3,000,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield 0   0      
Virginia Heritage Bank [Member] | Nonperforming Financial Instruments [Member]            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 587,000   587,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,600,000   1,600,000      
Virginia Heritage Bank [Member] | Loans Not Impaired [Member]            
Loans Fair Value At Acquisition 801,000,000   801,000,000      
Fidelity [Member] | Nonperforming Financial Instruments [Member]            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 491,000   491,000      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 548,000   548,000      
Home Equity Line of Credit [Member]            
Loans and Leases Receivable, Deferred Income $ 120,000 $ 144,000 $ 120,000 $ 144,000