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Note 17 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

		2015								2014								2013
		Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price
Beginning balance			759,683			$	11.36				503,834			$	10.41				722,155			$	10.18
Issued			5,000				46.50				21,000				32.77				5,800				22.11
Assumed from
Virginia Heritage			-				-				401,497				13.16				-				-
Exercised			(443,912	)			12.03				(157,313	)			14.71				(198,588	)			9.99
Forfeited			(12,380	)			29.58				(8,110	)			33.06				(2,420	)			7.40
Expired			(9,651	)			18.19				(1,225	)			9.00				(23,113	)			10.05
Ending balance			298,740			$	9.97				759,683			$	11.36				503,834			$	10.41

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			$	9.21				162,269			$	5.76				2.95
$	9.22			$	15.47				108,529				12.41				1.59
$	15.48			$	22.66				18,794				19.28				6.81
$	22.67			$	49.50				9,148				36.61				7.65
									298,740			$	9.97				2.84

Exercisable:								Stock Options				Weighted-Average
Range of Exercise Prices								Exercisable				Exercise Price
$	5.76			$	9.21				105,359			$	5.76
$	9.22			$	15.47				101,859				12.51
$	15.48			$	22.66				15,714				19.45
$	22.67			$	49.50				2,648				24.59
									225,580			$	9.99

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

		Years Ended December 31,
		2015				2014				2013
Expected volatility			31.21	%			34.25	%			34.12	%
Weighted-Average volatility			31.21	%			34.25	%			34.12	%
Expected dividends			-				-				-
Expected term (in years)			7.0				9.4				7.5
Risk-free rate			1.64	%			2.26	%			1.31	%
Weighted-average fair value (grant date)		$	16.73			$	13.49			$	7.83
Weighted-average fair value (grant date) for Virginia Heritage Bank ("VHB") options assumed			n/a			$	24.89				n/a

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]

		Years Ended December 31,
(dollars in thousands)		2015				2014				2013
Proceeds from stock options exercised		$	5,176			$	2,313			$	1,984
Tax benefits realized from stock compensation			2,984				978				410
Intrinsic value of stock options exercised			11,042				3,184				3,060

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

		Years Ended December 31,
		2015								2014
		Shares				Weighted-Average Grant Date Fair Value				Shares				Weighted-Average Grant Date Fair Value
Unvested at beginning			509,336			$	21.58				614,580			$	18.71
Issued			78,070				36.06				87,927				33.50
Forfeited			(8,490	)			33.57				(8,250	)			25.28
Vested			(209,823	)			21.47				(184,921	)			17.54
Unvested at end			369,093			$	24.43				509,336			$	21.58

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Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period.

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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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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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