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Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Option Activity |
|  | 2016 |  | 2015
Options outstanding at the |  |  |  |  |  |  |  |
beginning of the year |  |  | 1,267,802 |  |  |  | 1,357,813 |
Options granted |  |  | 171,000 |  |  |  | 47,000 |
Options forfeited |  |  | (33,825 | ) |  |  | (39,375 | )
Options exercised |  |  | (316,699 | ) |  |  | (97,636 | )
Options outstanding at |  |  |  |  |  |  |  |
the end of the year |  |  | 1,088,278 |  |  |  | 1,267,802 |
Options exercisable at the |  |  |  |  |  |  |  |
end of the year |  |  | 769,403 |  |  |  | 970,017 |
Common stock available for future grants at the end of the year |  |  | 66,850 |  |  |  | 201,350 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |
Granted |  | $ | 21.41 |  |  | $ | 18.90 |
Forfeited |  |  | 15.03 |  |  |  | 15.65 |
Exercised |  |  | 10.99 |  |  |  | 12.79 |
Outstanding |  |  | 14.18 |  |  |  | 12.46 |
Exercisable |  |  | 12.29 |  |  |  | 11.72 |
Summary of Options Outstanding |
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding | Weighted- Average Remaining Contractual Life (Years) | Weighted- Average Exercise Price |  | Number Exercisable | Weighted- Average Exercise Price
$7.30 to $10.10 | 214,038 | 4 | $ 9.49 |  | 214,038 | $ 9.49
$10.11 to $12.14 | 221,865 | 5 | 10.85 |  | 212,490 | 10.80
$12.15 to $14.68 | 218,000 | 5 | 13.49 |  | 182,000 | 13.44
$14.69 to $16.98 | 216,375 | 6 | 16.35 |  | 134,125 | 16.20
$16.99 to $21.49 | 218,000 | 9 | 20.84 |  | 26,750 | 19.09
| 1,088,278 |  |  |  | 769,403 |
Assumptions Used to Value Option Grants |
|  | 2016 |  | 2015
Expected life in years |  |  | 5 |  |  |  | 5 |
Interest rate |  |  | 1.07 – 1.24% |  |  |  | 1.33 – 1.62% |
Volatility |  |  | .236-.258 |  |  |  | .234-.252 |
Dividend yield |  |  | 1.6% - 2.0% |  |  |  | 1.95% - 2.10% |

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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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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=6415400&loc=d3e5070-113901 + Details
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