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Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock-Based Compensation [Abstract] |
Summary of Stock Option Activity [Table Text Block] |
| 2012 |  | 2011 |  | 2010
| Options |  | Weighted Average Exercise Price |  | Average Intrinsic Value |  | Options |  | Weighted Average Exercise Price |  | Average Intrinsic Value |  | Options |  | Weighted Average Exercise Price |  | Average Intrinsic Price
Outstanding, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
beginning of year | 209,914 |  | $ | 28.43 |  |  |  |  | 189,639 |  | $ | 28.52 |  |  |  |  | 170,915 |  | $ | 28.07 |  |  |
Granted | 27,500 |  |  | 29.75 |  |  |  |  | 29,000 |  |  | 27.43 |  |  |  |  | 28,000 |  |  | 27.74 |  |  |
Exercised | (18,577 | ) |  | 24.41 |  |  |  |  | (2,575 | ) |  | 19.69 |  |  |  |  | (9,276 | ) |  | 17.68 |  |  |
Forfeited | (12,711 | ) |  | 29.57 |  |  |  |  | (6,150 | ) |  | 30.25 |  |  |  |  | — |  |  | — |  |  |
Outstanding, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
end of year | 206,126 |  | $ | 28.90 |  | $ | 256,499 |  | 209,914 |  | $ | 28.43 |  | $ | 113,352 |  | 189,639 |  | $ | 28.52 |  | $ | 146,361
Exercisable, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
end of year | 178,626 |  | $ | 28.76 |  | $ | 256,499 |  | 180,914 |  |  | 28.59 |  |  | 112,152 |  | 161,639 |  |  | 28.66 |  |  | 145,471
Schedule of Fair Value Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Dividend yield |  |  | 3.27% |  |  | 3.30% |  |  | 3.04% |
Expected life |  |  | 10 years |  |  | 7 years |  |  | 7 years |
Expected volatility |  |  | 25.37% |  |  | 25.35% |  |  | 27.18% |
Risk-free interest rate |  |  | 1.76% |  |  | 1.39% |  |  | 2.72% |
Weighted average fair value of options granted |  | $ | 5.61 |  | $ | 4.70 |  | $ | 6.12 |
Schedule of Outstanding Stock Options [Table Text Block] |
|  | Options Outstanding |  | Average Exercise Price |  | Remaining Life, Years |  | Options Exercisable |  | Average Exercise Price |
|  | 13,426 |  | $ | 23.95 |  | 1.0 |  | 13,426 |  | $ | 23.95 |
|  | 14,700 |  |  | 30.00 |  | 2.0 |  | 14,700 |  |  | 30.00 |
|  | 21,000 |  |  | 30.38 |  | 3.3 |  | 21,000 |  |  | 30.38 |
|  | 19,500 |  |  | 31.50 |  | 4.0 |  | 19,500 |  |  | 31.50 |
|  | 19,500 |  |  | 31.25 |  | 5.0 |  | 19,500 |  |  | 31.25 |
|  | 19,000 |  |  | 27.50 |  | 6.0 |  | 19,000 |  |  | 27.50 |
|  | 1,000 |  |  | 28.90 |  | 6.3 |  | 1,000 |  |  | 28.90 |
|  | 18,500 |  |  | 28.59 |  | 7.0 |  | 18,500 |  |  | 28.59 |
|  | 1,000 |  |  | 26.88 |  | 7.2 |  | 1,000 |  |  | 26.88 |
|  | 22,500 |  |  | 27.77 |  | 8.0 |  | 22,500 |  |  | 27.77 |
|  | 1,000 |  |  | 26.27 |  | 8.5 |  | 1,000 |  |  | 26.27 |
|  | 27,500 |  |  | 27.47 |  | 9.0 |  | 27,500 |  |  | 27.47 |
|  | 27,500 |  |  | 29.75 |  | 10.0 |  | --- |  |  | --- |
Total |  | 206,126 |  | $ | 28.90 |  | 6.1 |  | 178,626 |  | $ | 28.76 |

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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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