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Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 01, 2016 USD ($)	Jul. 15, 2016 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 27, 2014
Goodwill, Impairment Loss			$ 1,490	$ 1,490	$ 1,492
Gain (Loss) on Disposition of Business							3,682
Acquisition of Bank Branches from First Bank [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets including Goodwill		$ 160,690
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable		149,120
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill and Intangible Assets		6,290
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total		134,380
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		134,310
Payments to Acquire Businesses, Gross		$ 3,840
Southwestern Virginia [Member] | Bank of America [Member]
Number of Operating Branches of Bank		7						7
Greenpoint Insurance Group [Member]
Proceeds from Divestiture of Businesses	$ 7,110
Sale of Business Earn-out Payments to be Received	$ 2,210
Sale of Business Earn-out Payments Term	3 years
Gain (Loss) on Disposition of Business							617
Goodwill and Intangible Asset Impairment, Total							6,490
Expenses Related to Divestiture of Business							46
Greenpoint Insurance Group [Member] | North Carolina [Member]
Number of Offices Sold	2
Greenpoint Insurance Group [Member] | Virginia [Member]
Number of Offices Sold	2
Divestiture of Bank Branches to First Bank [Member]
Gain (Loss) on Disposition of Business		$ 3,070
Disposal Group, Including Discontinued Operation, Assets, Total		162,170
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		155,540
Disposal Group Including Discontinued Operation Goodwill And Intangible Assets		2,330
Disposal Group, Including Discontinued Operation, Liabilities, Total		111,050
Disposal Group, Including Discontinued Operation, Liabilities, Deposits		111,020
Premium Received on Deposit Accounts Disposed of in Branch Sale		$ 4,070
Business Combination, Acquisition Related Costs							$ 684
Divestiture of Bank Branches to First Bank [Member] | North Carolina [Member]
Number of Branches Sold		6

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Amount of assets including goodwill acquired at the acquisition date.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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