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Note 10 - Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

		Three Months Ended March 31,
		2016								2015
		Shares				Weighted- Average Exercise Price				Shares				Weighted- Average Exercise Price
Beginning balance			298,740			$	9.97				759,683			$	11.36
Issued			-				-				-				-
Exercised			(16,759	)			11.80				(280,425	)			12.40
Forfeited			(1,100	)			15.48				-				-
Expired			(6,037	)			13.57				(8,007	)			16.90
Ending balance			274,844			$	9.76				471,251			$	10.65

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Outstanding:				Stock Options				Weighted-Average				Weighted-Average Remaining
Range of Exercise Prices				Outstanding				Exercise Price				Contractual Life
$5.76		$9.21			157,495			$	5.76				2.78
$9.22		$15.47			96,544				12.61				1.41
$15.48		$22.66			11,657				19.05				4.68
$22.67		$49.50			9,148				36.61				7.40
					274,844			$	9.76				2.53

Exercisable:				Stock Options				Weighted-Average
Range of Exercise Prices				Exercisable				Exercise Price
$5.76		$9.21			105,448			$	5.76
$9.22		$15.47			96,544				12.61
$15.48		$22.66			10,337				18.93
$22.67		$49.50			2,648				24.59
					214,977			$	9.70

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Three Months Ended				Years Ended December 31,
		March 31, 2016				2015				2014
Expected volatility			n/a				31.21	%			34.25	%
Weighted-Average volatility			n/a				31.21	%			34.25	%
Expected dividends			0.0	%			0.0	%			0.0	%
Expected term (in years)			n/a				7.0				9.4
Risk-free rate			n/a				1.64	%			2.26	%
Weighted-average fair value (grant date)			n/a			$	16.73			$	13.49
Weighted-average fair value (grant date) for Virginia Heritage Bank ("VHB") options assumed			n/a				n/a			$	24.89

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

		Three Months Ended March 31,
		2016								2015
		Shares				Weighted- Average Grant Date Fair Value				Shares				Weighted- Average Grant Date Fair Value
Unvested at beginning			369,093			$	24.43				509,336			$	21.58
Issued			139,732				46.17				78,070				36.06
Forfeited			(766	)			37.48				(339	)			28.09
Vested			(195,188	)			22.53				(193,338	)			20.66
Unvested at end			312,871			$	35.29				393,729			$	24.90

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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