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Note 15 - Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |
Beginning balance |  |  | 501,334 |  |  | $ | 10.34 |  |  |  | 722,155 |  |  | $ | 10.18 |  |  |  | 919,371 |  |  | $ | 10.23 |
Issued |  |  | 21,000 |  |  |  | 32.77 |  |  |  | 3,300 |  |  |  | 20.03 |  |  |  | 5,500 |  |  |  | 15.48 |
Assumed from |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Heritage |  |  | 401,497 |  |  |  | 13.16 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | (157,313 | ) |  |  | 14.71 |  |  |  | (198,588 | ) |  |  | 9.99 |  |  |  | (167,882 | ) |  |  | 10.01 |
Forfeited |  |  | (8,110 | ) |  |  | 33.06 |  |  |  | (2,420 | ) |  |  | 7.40 |  |  |  | (3,493 | ) |  |  | 6.22 |
Expired |  |  | (1,225 | ) |  |  | 9.00 |  |  |  | (23,113 | ) |  |  | 10.05 |  |  |  | (31,341 | ) |  |  | 13.92 |
Ending balance |  |  | 757,183 |  |  | $ | 11.31 |  |  |  | 501,334 |  |  | $ | 10.34 |  |  |  | 722,155 |  |  | $ | 10.18 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Outstanding: |  |  | Stock Options Outstanding |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Life |
Range of Exercise Prices |  |  |  |  |  |  |  |  |  |  |  |  |
$ | 5.76 $ 9.22 |  |  |  | 249,788 |  |  | $ | 5.95 |  |  |  | 3.73 |
$ | 9.22 $ 15.47 |  |  |  | 365,467 |  |  |  | 11.18 |  |  |  | 1.74 |
$ | 15.48 $ 24.41 |  |  |  | 119,052 |  |  |  | 19.57 |  |  |  | 3.50 |
$ | 24.42 $ 32.36 |  |  |  | 22,876 |  |  |  | 28.94 |  |  |  | 5.85 |
|  |  |  |  | 757,183 |  |  | $ | 11.31 |  |  |  | 2.80 |
Exercisable: |  |  | Stock Options Exercisable |  |  | Weighted-Average Exercise Price |
Range of Exercise Prices |  |  |  |  |  |  |  |  |
$ | 5.76 $ 9.22 |  |  |  | 192,878 |  |  | $ | 6.00 |
$ | 9.22 $ 15.47 |  |  |  | 348,429 |  |  |  | 11.20 |
$ | 15.48 $ 24.41 |  |  |  | 113,112 |  |  |  | 19.68 |
$ | 24.42 $ 32.36 |  |  |  | 9,876 |  |  |  | 24.43 |
|  |  |  |  | 664,295 |  |  | $ | 11.33 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Expected volatility |  |  | 34.25 | % |  |  | 34.12 | % |  |  | 36.64 | %
Weighted-Average volatility |  |  | 34.25 | % |  |  | 34.12 | % |  |  | 36.64 | %
Expected dividends |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term (in years) |  |  | 9.4 |  |  |  | 7.5 |  |  |  | 7.5 |
Risk-free rate |  |  | 2.26 | % |  |  | 1.31 | % |  |  | 1.13 | %
Weighted-average fair value (grant date) |  | $ | 13.49 |  |  | $ | 7.83 |  |  | $ | 6.35 |
Weighted-average fair value (grant date) for VHB options assumed |  | $ | 24.89 |  |  | n/a |  |  | n/a |
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] |
|  | Years Ended December 31, |
(dollars in thousands) |  | 2014 |  |  | 2013 |  |  | 2012 |
Proceeds from stock options exercised |  | $ | 2,313 |  |  | $ | 1,984 |  |  | $ | 1,685 |
Tax benefits related to stock options exercised |  |  | 978 |  |  |  | 410 |  |  |  | 369 |
Intrinsic value of stock options exercised |  |  | 3,184 |  |  |  | 3,060 |  |  |  | 1,100 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested at beginning |  |  | 614,580 |  |  | $ | 18.71 |  |  |  | 348,350 |  |  | $ | 13.79 |
Issued |  |  | 87,927 |  |  |  | 33.50 |  |  |  | 424,450 |  |  |  | 20.64 |
Forfeited |  |  | (8,250 | ) |  |  | 25.28 |  |  |  | (1,318 | ) |  |  | 15.73 |
Vested |  |  | (184,921 | ) |  |  | 17.54 |  |  |  | (156,902 | ) |  |  | 13.04 |
Unvested at end |  |  | 509,336 |  |  | $ | 21.58 |  |  |  | 614,580 |  |  | $ | 18.71 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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