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Note 5 - Loans and Allowance for Credit Losses (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 24, 2015 USD ($) | Oct. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | $ 18,400,000 | $ 15,600,000 |  |  |
Servicing Asset at Fair Value, Amount | $ 78,800,000 | 67,900,000 |  |  |
Minimum Debt Service Coverage | 1.15 |  |  |  |
Stress Test Assumption, Increase in Interest Rates | 2.00% |  |  |  |
Financing Receivable, Net | $ 4,998,368,000 | $ 4,312,399,000 |  |  |
Loan Percent | 100.00% | 100.00% |  |  |
Loans and Leases Receivable, Allowance | $ 52,687,000 | $ 46,075,000 |  |  | $ 40,921,000
Financing Receivable, Modifications, Recorded Investment | 1,900,000 | $ 8,000,000 |  |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 1,000,000 |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method | $ 629,000 |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 | 8 |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 11,600,000 |  |  |
Financing Receivable, Modifications, Number of Contracts | 4 | 4 |  |  |
Performing Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 11,800,000 | $ 13,500,000 |  |  |
Sold [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 9,100,000 |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 4 |  |  |
Reclassified To OREO [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 2,000,000 |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |  |  |
Reclassified To Nonperforming Loans [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |  |  |
Charged Off [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 95,000 |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |  |  |
Paid Off [Member] | Performing Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 3,300,000 |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 2 |  |  |  |
Home Equity Line of Credit [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | $ 144,000 | $ 182,000 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Sale of Loan Receivable, Selling Price |  |  | $ 80,300,000 |  |
Sale of Loan Receivable, Estimated Loss |  |  | $ 900,000 |  |
Percent of Loan Portfolio | 2.00% |  |  |  |
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 | 12.00% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] | ADC Loans [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Net | $ 1,070,000 |  |  |  |
Loan Percent | 49.00% |  |  |  |
Commercial Real Estate and Real Estate Construction Loans [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Percent of Loan Portfolio | 74.00% |  |  |  |
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% |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Percent of Loan Portfolio | 21.00% |  |  |  |
Financing Receivable, Net | $ 1,052,257,000 | $ 916,226,000 |  |  |
Loan Percent | 21.00% | 21.00% |  |  |
Loans and Leases Receivable, Allowance | $ 11,563,000 | $ 13,222,000 |  |  | 9,780,000
Commercial Portfolio Segment [Member] | SBA Loans [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Percent of Loan Portfolio | 1.00% |  |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Net | $ 147,365,000 | $ 148,018,000 |  |  |
Loan Percent | 3.00% | 3.00% |  |  |
Loans and Leases Receivable, Allowance | $ 1,268,000 | $ 1,259,000 |  |  | $ 944,000
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% |  |  |  |
Virginia Heritage Bank [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loans Fair Value At Acquisition | $ 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 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 1,300,000 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield | 0 |  |  |  |
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 | 1,300,000 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | 2,300,000 |  |  |  |
Virginia Heritage Bank [Member] | Loans Not Impaired [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loans Fair Value At Acquisition | 801,000,000 |  |  |  |
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 | 509,000 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | 566,000 |  |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 3,000 |  |  |  |
Paid Off [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | 217,000 |  |  |
Reclassified To Nonperforming Loans [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 227,000 |  |  |
Maximum [Member] |  |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |
Loan to Value Ratio | 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 | 10 years |  |  |  |
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 |  |  |  |

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 Loans acquired in a business combination, at fair value of the receivables acquired, for both loans transferred in and otherwise accounted for. + References No definition available. + Details
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- Definition The selling price of the indirect consumer loan portfolio acquired in the Merger under the contract. + References No definition available. + Details
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- Definition Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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 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 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 amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + 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=49124121&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, 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=49124121&loc=SL6953682-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122625-111746 + Details
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