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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock option plans |
STOCK OPTION PLANS |
Schedule of summary of activity under the stock option plans |
|  | December 31,
|  | 2017 |  | 2016
|  | Number of |  | Weighted |  | Number of |  | Weighted
|  | Shares |  | Average |  | Shares |  | Average
|  | Underlying |  | Exercise |  | Underlying |  | Exercise
(Dollars in thousands, except per share data) |  | Options |  | Price |  | Options |  | Price
Options outstanding at beginning of period |  | 248,314 |  | $ | 12.80 |  | 647,074 |  | $ | 10.99
Granted |  | 80,000 |  | $ | 21.00 |  | — |  | $ | —
Forfeited |  | (56,832) |  | $ | 10.14 |  | (5,062) |  | $ | 9.85
Exercised |  | (11,160) |  | $ | 10.47 |  | (393,698) |  | $ | 9.87
Options outstanding at end of period |  | 260,322 |  | $ | 16.00 |  | 248,314 |  | $ | 12.80
Schedule of fair value of each option grant estimated on the date of grant using the Black-Scholes option pricing model |
| Year Ended |  |  | Year Ended |
| December 31, |  |  | December 31, |
| 2017 |  |  | 2015 |
Dividend yield | 0.95 | % |  | 1.19 | %
Expected volatility | 35.97 | % |  | 8.96 | %
Risk free interest rate | 2.42 | % |  | 2.05 | %
Expected life in years | 6.0 |  |  | 6.0 |
Schedule of exercisable, unvested and outstanding of stock options and restricted stock |
|  | December 31, 2017
Stock Options |  |  | Exercisable |  |  | Unvested |  |  | Outstanding
Number of shares underlying options |  |  | 127,122 |  |  | 133,200 |  |  | 260,322
Weighted-average exercise price per share |  | $ | 12.49 |  | $ | 19.36 |  | $ | 16.00
Aggregate intrinsic value (in thousands) |  | $ | 2,183 |  | $ | 1,372 |  | $ | 3,555
Weighted-average contractual term (years) |  |  | 4.5 |  |  | 8.6 |  |  | 6.6
Restricted Stock |
STOCK OPTION PLANS |
Schedule of exercisable, unvested and outstanding of stock options and restricted stock |
|  | December 31, 2017
Restricted stock |  |  | Exercisable |  |  | Unvested |  |  | Outstanding
Number of shares underlying restricted stock |  |  | — |  |  | 212,580 |  |  | 212,580
Weighted-average grant date fair value per share |  | $ | — |  | $ | 27.27 |  | $ | 27.27
Aggregate grant date fair value (in thousands) |  | $ | — |  | $ | 5,797 |  | $ | 5,797
Weighted-average contractual term (years) |  |  | — |  |  | 4.4 |  |  | 4.4

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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