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Note 17 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Shares |  |  | Weighted- Average Exercise Price |
Beginning balance |  |  | 298,740 |  |  | $ | 9.97 |  |  |  | 759,683 |  |  | $ | 11.36 |  |  |  | 503,834 |  |  | $ | 10.41 |
Issued |  |  | 3,000 |  |  |  | 49.49 |  |  |  | 5,000 |  |  |  | 46.50 |  |  |  | 21,000 |  |  |  | 32.77 |
Assumed from |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Heritage |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 401,497 |  |  |  | 13.16 |
Exercised |  |  | (77,144 | ) |  |  | 14.48 |  |  |  | (443,912 | ) |  |  | 12.03 |  |  |  | (157,313 | ) |  |  | 14.71 |
Forfeited |  |  | (1,100 | ) |  |  | 15.48 |  |  |  | (12,380 | ) |  |  | 29.58 |  |  |  | (8,110 | ) |  |  | 33.06 |
Expired |  |  | (6,637 | ) |  |  | 12.87 |  |  |  | (9,651 | ) |  |  | 18.19 |  |  |  | (1,225 | ) |  |  | 9.00 |
Ending balance |  |  | 216,859 |  |  | $ | 8.80 |  |  |  | 298,740 |  |  | $ | 9.97 |  |  |  | 759,683 |  |  | $ | 11.36 |
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 |  |  |  | 154,535 |  |  |  | $ 5.76 |  |  |  | 2.02 |
$ | 10.73 |  |  | $ | 15.45 |  |  |  | 47,886 |  |  |  | 10.83 |  |  |  | 1.49 |
$ | 15.46 |  |  | $ | 20.01 |  |  |  | 447 |  |  |  | 16.66 |  |  |  | 6.22 |
$ | 20.02 |  |  | $ | 49.91 |  |  |  | 13,991 |  |  |  | 35.12 |  |  |  | 7.23 |
|  |  |  |  |  |  |  |  | 216,859 |  |  |  | $ 8.80 |  |  |  | 2.25 |
Exercisable: |  |  |  |  |  |  | Stock Options |  |  | Weighted-Average |  |  |  |  |
Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |  |  |  |  |
$ | 5.76 |  |  | $ | 10.72 |  |  |  | 102,488 |  |  |  | $ 5.76 |  |  |  |  |
$ | 10.73 |  |  | $ | 15.45 |  |  |  | 47,886 |  |  |  | 10.83 |  |  |  |  |
$ | 15.46 |  |  | $ | 20.01 |  |  |  | 447 |  |  |  | 16.66 |  |  |  |  |
$ | 20.02 |  |  | $ | 49.91 |  |  |  | 4,921 |  |  |  | 23.83 |  |  |  |  |
|  |  |  |  |  |  |  |  | 155,742 |  |  |  | $ 7.92 |  |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected volatility |  |  | 24.23 | % |  |  | 31.21 | % |  |  | 34.25 | %
Weighted-Average volatility |  |  | 24.23 | % |  |  | 31.21 | % |  |  | 34.25 | %
Expected dividends |  |  | - |  |  |  | - |  |  |  | - |
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 Cash Proceeds Received from Share-based Payment Awards [Table Text Block] |
|  | Years Ended December 31, |
(dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Proceeds from stock options exercised |  | $ | 955 |  |  | $ | 5,176 |  |  | $ | 2,313 |
Tax benefits realized from stock compensation |  |  | 400 |  |  |  | 2,984 |  |  |  | 978 |
Intrinsic value of stock options exercised |  |  | 2,824 |  |  |  | 11,042 |  |  |  | 3,184 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Years Ended December 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 |  |  |  | 45.45 |  |  |  | 78,070 |  |  |  | 36.06 |
Forfeited |  |  | (10,480 | ) |  |  | 40.28 |  |  |  | (8,490 | ) |  |  | 33.57 |
Vested |  |  | (202,153 | ) |  |  | 23.22 |  |  |  | (209,823 | ) |  |  | 21.47 |
Unvested at end |  |  | 296,192 |  |  | $ | 34.61 |  |  |  | 369,093 |  |  | $ | 24.43 |

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- Definition 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. + 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 (j) -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 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. + 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 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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