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Note 10 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

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

		Nine Months Ended September 30,
		2016								2015
		Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price
Beginning balance			298,740			$	9.97				759,683			$	11.36
Issued			3,000				49.49				-				-
Exercised			(24,458	)			13.10				(377,357	)			12.73
Forfeited			(1,100	)			15.48				(12,380	)			29.58
Expired			(6,637	)			12.87				(8,476	)			17.32
Ending balance			269,545			$	10.03				361,470			$	9.16

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

																Weighted-Average
Outstanding:								Stock Options				Weighted-Average				Remaining
Range of Exercise Prices								Outstanding				Exercise Price				Contractual Life
$	5.76			$	10.72				156,345			$	5.76				2.27
$	10.73			$	15.45				59,232				10.90				1.46
$	15.46			$	20.01				36,747				15.48				0.13
$	20.02			$	49.91				17,221				34.21				7.46
									269,545			$	10.03				2.13

Exercisable:								Stock Options				Weighted-Average
Range of Exercise Prices								Exercisable				Exercise Price
$	5.76			$	10.72				104,298			$	5.76
$	10.73			$	15.45				59,232				10.90
$	15.46			$	20.01				36,747				15.48
$	20.02			$	49.91				6,901				22.74
									207,178			$	9.52

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

		Nine Months Ended				Years Ended December 31,
		September 30, 2016				2015				2014
Expected volatility			24.23	%			31.21	%			34.25	%
Weighted-Average volatility			24.23	%			31.21	%			34.25	%
Expected dividends			0.0	%			0.0	%			0.0	%
Expected term (in years)			7.0				7.0				9.4
Risk-free rate			1.37	%			1.64	%			2.26	%
Weighted-average fair value (grant date)		$	14.27			$	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]

		Nine Months Ended September 30,
		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				45.45				78,070				36.06
Forfeited			(9,475	)			40.58				(4,150	)			29.18
Vested			(195,738	)			22.53				(195,503	)			20.74
Unvested at end			303,612			$	34.83				387,753			$	24.89

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