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Note 5 - Loans and Allowance for Credit Losses (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Jul. 24, 2015 USD ($)
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income (in Dollars) | $ 17,400 | $ 15,200 | $ 17,400 | $ 15,200 | $ 15,600 |
Servicing Asset at Fair Value, Amount (in Dollars) | $ 68,900 |  | $ 68,900 |  | 67,900 |
Minimum Debt Service Coverage | 1.15 |  | 1.15 |  |  |
Stress Test Assumption, Increase in Interest Rates | 2.00% |  | 2.00% |  |  |
Financing Receivable, Net (in Dollars) | $ 4,776,965 |  | $ 4,776,965 |  | $ 4,312,399 |
Loan Percent | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans (in Dollars) |  |  | $ 822 |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method (in Dollars) |  |  | $ 127 |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 0 | 1 |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment (in Dollars) |  |  |  | $ 2,100 |  |
Financing Receivable, Modifications, Number of Contracts | 3 | 1 | 4 | 1 |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 15,445 | $ 2,100 | $ 13,729 |
Nonperforming Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 0 | 1 |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 215 |  | 227 |
Performing Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment (in Dollars) | $ 15,200 | $ 7,900 | 15,200 | $ 7,900 | 13,500 |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 15,230 |  | 13,502 |
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied and Construction [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 11.00% |  | 11.00% |  |  |
Commercial Real Estate Portfolio Segment [Member] | ADC Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Net (in Dollars) | $ 987,800 |  | $ 987,800 |  |  |
Loan Percent | 44.00% |  | 44.00% |  |  |
Commercial Real Estate and Real Estate Construction Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 73.00% |  | 73.00% |  |  |
Commercial Real Estate and Real Estate Construction Loans [Member] | Excluding Owner Occupied Commercial Real Estate and Commercial Construction Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 62.00% |  | 62.00% |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 21.00% |  | 21.00% |  |  |
Financing Receivable, Net (in Dollars) | $ 1,007,659 |  | $ 1,007,659 |  | $ 916,226 |
Loan Percent | 21.00% | 23.00% | 21.00% | 23.00% | 21.00% |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 1,387 |  | $ 227 |
Commercial Portfolio Segment [Member] | SBA Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 1.00% |  | 1.00% |  |  |
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 215 |  | 227 |
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment (in Dollars) |  |  | $ 1,172 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 3.00% |  | 3.00% |  |  |
Sale of Loan Receivable, Selling Price (in Dollars) |  |  |  |  |  | $ 79,000
Sale of Loan Receivable, Estimated Loss (in Dollars) |  |  |  |  |  | $ 879
Residential Portfolio Segment [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Financing Receivable, Net (in Dollars) | $ 147,720 |  | $ 147,720 |  | $ 148,018 |
Loan Percent | 3.00% | 4.00% | 3.00% | 4.00% | 3.00% |
Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Percent of Loan Portfolio | 3.00% |  | 3.00% |  |  |
Fidelity [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) | $ 1,800 |  | $ 1,800 |  |  |
Virginia Heritage Bank [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) | $ 2,900 |  | $ 2,900 |  |  |
Maximum [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan to Value Ratio | 80.00% |  | 80.00% |  |  |
Loan Period |  |  | 90 days |  |  |
Maximum [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 10 years |  |  |
Amortization Term |  |  | 25 years |  |  |
Maximum [Member] | Commercial Portfolio Segment [Member] | Land Acquisition, Development, and Construction Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 24 months |  |  |
Maximum [Member] | Commercial Portfolio Segment [Member] | Preferred Term [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 7 years |  |  |
Maximum [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 26 months |  |  |
Maximum [Member] | Residential Portfolio Segment [Member] | Land Acquisition, Development, and Construction Loans [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 36 months |  |  |
Minimum [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Interest Rate Adjustment Frequency |  |  | 5 years |  |  |
Loan Period |  |  | 30 days |  |  |
Minimum [Member] | Commercial Portfolio Segment [Member] | Preferred Term [Member] |  |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |
Loan Period |  |  | 5 years |  |  |

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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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