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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 |  |  |

X
- Definition Amortization period for loans, 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 Percent of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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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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- Definition The increase (decrease) in accreditable yield (the excess of the loan's cash flows expected to be collected over the investor's initial investment in the loan) for the period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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