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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 |  |

X
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- Definition Period of time between origination and maturity of a loan, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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