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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value of Options Granted | The fair value of options granted is estimated on the date of the grant using an option-pricing model with the following weighted-average assumptions:
December 31 |  | 2017 |  |  | 2016 |  |  | 2015 |
Dividend yields |  |  | 1.75 | % |  |  | 2.34 | % |  |  | 2.35 | %
Volatility factors of expected market price of common stock |  |  | 28.52 | % |  |  | 28.60 | % |  |  | 28.97 | %
Risk-free interest rates |  |  | 2.42 | % |  |  | 1.83 | % |  |  | 2.10 | %
Expected life of options |  |  | 8 years |  |  |  | 8 years |  |  |  | 8 years |
Summary of Status of Non-vested, Restricted and Performance Shares | A summary of the status of Horizon’s non-vested restricted and performance shares as of December 31, 2017 are presented below:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Non-vested beginning of year |  |  | 70,959 |  |  | $ | 15.59 |
Vested |  |  | (6,754 | ) |  |  | 14.80 |
Granted |  |  | 41,786 |  |  |  | 25.49 |
Forfeited |  |  | (9,461 | ) |  |  | 15.05 |
Non-vested, end of year |  |  | 96,530 |  |  |  | 19.98 |
Stock Options 2003 Plan [Member] |
Summary of Option Activity under 2003 Plan | A summary of option activity under the 2003 Plan as of December 31, 2017, and changes during the year then ended, is presented below:
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  |  |  |  | Average |  |  |  |
|  |  |  |  | Weighted- |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Average |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Term |  |  | Value |
Outstanding, beginning of year |  |  | 36,635 |  |  | $ | 7.25 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (9,185 | ) |  |  | 6.86 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding, end of year |  |  | 27,450 |  |  |  | 7.37 |  |  |  | 2.73 |  |  | $ | 560,691 |
Exercisable, end of year |  |  | 27,450 |  |  |  | 7.37 |  |  |  | 2.73 |  |  |  | 560,691 |
Stock Options 2013 Plan [Member] |
Summary of Option Activity under 2003 Plan | A summary of option activity under the 2013 Plan as of December 31, 2017, and changes during the year then ended, is presented below:
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  |  |  |  | Average |  |  |  |
|  |  |  |  | Weighted- |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Average |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Term |  |  | Value |
Outstanding, beginning of year |  |  | 286,586 |  |  | $ | 15.08 |  |  |  |  |  |  |  |  |
Granted |  |  | 43,502 |  |  |  | 25.14 |  |  |  |  |  |  |  |  |
Exercised |  |  | (108,434 | ) |  |  | 14.77 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (5,871 | ) |  |  | 15.64 |  |  |  |  |  |  |  |  |
Outstanding, end of year |  |  | 215,783 |  |  |  | 17.25 |  |  |  | 7.69 |  |  | $ | 2,276,823 |
Exercisable, end of year |  |  | 88,036 |  |  |  | 14.77 |  |  |  | 6.62 |  |  |  | 1,147,538 |

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- Definition Tabular disclosure for share-based compensation 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 (c)(2) -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 (d) -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 (e) -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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