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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Summary of Stock Option Activity [Table Text Block] |
|  | 2015 |  | 2014 |  | 2013
Number of shares under the plans: |  |  |  |  |  |
Outstanding and exercisable at beginning of year |  | 7,500 |  | 18,750 |  | 22,500
Granted |  | - |  | - |  | -
Canceled |  | - |  | - |  | -
Exercised |  | (7,500) |  | (11,250) |  | (3,750)
Outstanding and exercisable at end of year |  | - |  | 7,500 |  | 18,750
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Restricted | Performance |  | Weighted Average
|  | Stock | Stock |  | Grant Date
|  | Units | Units |  | Fair Value
Outstanding at January 1, 2013 |  | 176,646 | 59,725 | $ | 31.65
Granted |  | 12,973 | 31,418 |  | 42.49
Vested |  | (41,579) | - |  | 29.18
Adjustment for incentive awards not expected to vest |  | - | (18,408) |  | 35.84
Canceled |  | (18,314) | (11,084) |  | 33.55
Outstanding at December 31, 2013 |  | 129,726 | 61,651 | $ | 34.00
Granted |  | 19,051 | 34,652 |  | 44.07
Vested |  | (40,540) | (13,588) |  | 34.59
Adjustment for incentive awards not expected to vest |  | - | (7,845) |  | 43.59
Canceled |  | - | (2,880) |  | 44.13
Outstanding at December 31, 2014 |  | 108,237 | 71,990 | $ | 36.25
Granted |  | 29,656 | 41,114 |  | 44.93
Vested |  | (39,076) | (23,877) |  | 32.35
Adjustment for incentive awards not expected to vest |  | - | (53,228) |  | 43.26
Canceled |  | (5,000) | - |  | 44.84
Outstanding at December 31, 2015 |  | 93,817 | 35,999 | $ | 39.66
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | 2015 |  | 2014 |  | 2013
Number of shares available for future grant: |  |  |  |  |  |
Beginning of year |  | 469,840 |  | 513,280 |  | 517,280
End of year |  | 407,307 |  | 469,840 |  | 513,280

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
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- References No definition available. + Details
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