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Note 5 - Loans and Allowance for Credit Losses (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loans and Leases Receivable, Deferred Income $ 22,800 $ 18,900 $ 22,300
Servicing Asset at Fair Value, Amount $ 142,900   128,800
Minimum Debt Service Coverage 1.15    
Stress Test Assumption Increase Interest Rates 2.00%    
Financing Receivable, Net $ 5,824,946   $ 5,677,893
Financing Receivable, Modifications, Recorded Investment 8,800    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 304    
Impaired Financing Receivable, Interest Income, Accrual Method $ 90    
Financing Receivable Modifications Number of Contracts Outstanding 9   10
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 1 1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 237 $ 5,000  
Nonperforming TDRs Reclassified to Nonperforming Loans 0 1  
Nonperforming TDRs Reclassified to Nonperforming Loans, Amount   $ 5,000  
Financing Receivable, Modifications, Number of Contracts 0 0  
Nonperforming Financial Instruments [Member]      
Financing Receivable Modifications Number of Contracts Outstanding 2   3
Nonperforming Financial Instruments [Member] | Fidelity [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 486    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 543    
Nonperforming Financial Instruments [Member] | Virginia Heritage Bank [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 559    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 1,600    
Performing Financial Instruments [Member]      
Financing Receivable, Modifications, Recorded Investment $ 7,900 $ 6,800 $ 7,900
Financing Receivable Modifications Number of Contracts Outstanding 7   7
Financing Receivable, Modifications, Number of Contracts 7    
Maximum [Member]      
Loan To Value Ratio 80.00%    
Loan Period 90 days    
Minimum [Member]      
Interest Rate Adjustment Frequency 5 years    
Loan Period 30 days    
Owner Occupied Commercial Real Estate and Construction [Member]      
Percent Of Loan Portfolio 13.00%    
Income Producing Commercial Real Estate and Real Estate Construction [Member]      
Percent Of Loan Portfolio 61.00%    
Commercial Real Estateand Real Estate Construction Loans [Member]      
Percent Of Loan Portfolio 74.00%    
Commercial Portfolio Segment [Member]      
Percent Of Loan Portfolio 21.00%    
Financing Receivable, Net $ 1,235,832   $ 1,200,728
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 237    
Commercial Portfolio Segment [Member] | S B A Loans [Member]      
Percent Of Loan Portfolio 2.00%    
Commercial Portfolio Segment [Member] | A D C Loans [Member]      
Percent Of Loan Portfolio 64.10%    
Financing Receivable, Net $ 1,150,000    
Commercial Portfolio Segment [Member] | Maximum [Member]      
Loan Period 10 years    
Amortization Term 25 years    
Commercial Portfolio Segment [Member] | Maximum [Member] | Preferred Term [Member]      
Loan Period 7 years    
Commercial Portfolio Segment [Member] | Minimum [Member] | Preferred Term [Member]      
Loan Period 5 years    
Consumer Portfolio Segment [Member]      
Percent Of Loan Portfolio 2.00%    
Residential Portfolio Segment [Member]      
Financing Receivable, Net $ 155,021   $ 152,748
Residential Portfolio Segment [Member] | Real Estate Loan [Member]      
Percent Of Loan Portfolio 3.00%    
Loan Period 1 year 270 days