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Note 7 - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Oct. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2014	Aug. 31, 2009	Aug. 31, 2008
Note 7 - Intangible Assets (Details) [Line Items]
Amortization of Intangible Assets	$ 1,500		$ 743	$ 614
Goodwill, Period Increase (Decrease)		$ (257)
Fidelity [Member]
Note 7 - Intangible Assets (Details) [Line Items]
Goodwill	2,200					$ 360
Virginia Heritage Bank [Member]
Note 7 - Intangible Assets (Details) [Line Items]
Goodwill					$ 102,300
Goodwill, Period Increase (Decrease)		$ (257)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					4,600
Core Deposits [Member] | Fidelity [Member]
Note 7 - Intangible Assets (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	502						$ 2,300
Core Deposits [Member] | Virginia Heritage Bank [Member]
Note 7 - Intangible Assets (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3,500				$ 4,600

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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