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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of stock option payment awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted average fair values:
| 2015 |  | 2014 |  | 2013
Weighted average fair value of grants | $ | - |  | $ | - |  | $ | 2.50-2.87
Risk-free interest rate |  | -% |  |  | -% |  |  | 1.86-2.29%
Dividend yield |  | -% |  |  | -% |  |  | 1.76-2.11%
Expected volatility |  | -% |  |  | -% |  |  | 23.21-33.74%
Expected life in months |  |  |  |  | - |  |  | 69-90
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Option activity under the principal option plans as of December 31, 2015 and changes during the twelve months ended December 31, 2015 were as follows:
|  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  | Average |  |  |
|  |  | Weighted- |  | Remaining |  |  |
|  |  | Average |  | Contractual |  |  |
|  |  | Exercise |  | Term |  | Aggregate
| Shares |  | Price |  | (In Years) |  | Intrinsic Value
Outstanding at December 31, 2014 | 882,657 |  | $ | 5.65 |  |  |  |  |
Granted | - |  |  | - |  |  |  |  |
Exercised | (340,492) |  |  | 4.19 |  |  |  |  |
Forfeited/cancelled/expired | (6,259) |  |  | 5.60 |  |  |  |  |
Outstanding at December 31, 2015 | 535,906 |  | $ | 6.48 |  | 3.16 |  | $ | 6,541,740
Exercisable at December 31, 2015 | 532,376 |  | $ | 6.43 |  | 3.13 |  | $ | 6,526,031
Schedule of Share Based Compensation Stock Option Plan Table Text Block | Information related to the stock option plan during 2015:
| 2015
Intrinsic value of options exercised | $ | 5,218,993
Cash received from options exercised |  | 1,424,814
Tax benefit realized from options exercised |  | 341,000
Weighted average fair value of options granted |  | -
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The below table represents information regarding restricted shares currently outstanding at December 31, 2015:
|  |  | Weighted-
|  |  | Average
| Nonvested |  | Grant Date
| Shares |  | Fair Value
Nonvested at December 31, 2014 | 50,303 |  | $ | 11.79
Granted | 69,258 |  |  | 18.13
Vested | (19,061) |  |  | 11.53
Forfeited/cancelled/expired | (3,598) |  |  | 18.43
Nonvested at December 31, 2015 | 96,902 |  | $ | 16.81
Schedule of Unearned Performance Unit Awards [Table Text Block] | A summary of the status of unearned performance unit awards and the change during the period is presented in the table below:
|  |  | Weighted-
|  |  | Average
|  |  | Grant Date
| Shares |  | Fair Value
Unearned at December 31, 2014 | - |  | $ | -
Awarded | 94,585 |  |  | 19.46
Forfeited | - |  |  | -
Expired | - |  |  | -
Unearned at December 31, 2015 | 94,585 |  | $ | 19.46

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- Definition Tabular disclosure of schedule of unearned performance unit awards. + References No definition available. + Details
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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 restricted stock units. + 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 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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