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Note 1 - Summary of Significant Accounting Policies (Details) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($)
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  | $ 0 |
Deferred Tax Assets, Valuation Allowance |  | $ 0 | $ 0 | $ 0
Banking Services [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Offices |  | 22 |  |
Lending Services [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Offices |  | 4 |  |
Virginia Heritage Bank [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans | $ 800,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities | 645,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings | 95,000,000 |  |  |
Goodwill | 102,300,000 |  |  |
Business Combination, Fair Value Credit Mark on Loan Portfolio | 12,500,000 |  |  |
Eagle Commercial Ventures, LLC [Member] | Risk Level, High [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Higher Risk Lending Transactions Outstanding |  | 7 | 4 |
Loans Receivable, Net |  | $ 11,500,000 | $ 6,200,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Virginia Heritage Bank [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans | 3,000,000 |  |  |
Minimum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Loan Period |  | 30 days |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |
Maximum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Loan Period |  | 90 days |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |
Core Deposits [Member] | Virginia Heritage Bank [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 4,600,000 |  |  |
Finite-Lived Intangible Asset, Useful Life | 6 years |  |  |
Servicing Contracts [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Other Intangible Assets, Net |  | $ 0 | $ 0 | $ 0
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |

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