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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-Based Compensation [Abstract] |
Summary of Stock Option Activity [Table Text Block] |
| 2015 |  | 2014 |  | 2013
|  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  |
|  |  | Average |  | Average |  |  |  | Average |  | Average |  |  |  | Average |  | Aggregate
|  |  | Exercise |  | Intrinsic |  |  |  | Exercise |  | Intrinsic |  |  |  | Exercise |  | Intrinsic
| Options |  | Price |  | Value |  | Options |  | Price |  | Value |  | Options |  | Price |  | Value
Outstanding, beginning of year | 206,463 |  | $ | 26.74 |  |  |  |  | 219,540 |  | $ | 26.64 |  |  |  |  | 225,670 |  | $ | 26.27 |  |  |
Granted | 14,500 |  |  | 28.55 |  |  |  |  | 12,500 |  |  | 29.08 |  |  |  |  | 28,600 |  |  | 27.07 |  |  |
Exercised | (16,859) |  |  | 26.19 |  |  |  |  | (25,577) |  |  | 27.05 |  |  |  |  | (24,127) |  |  | 23.83 |  |  |
Forfeited | (9,583) |  |  | 27.02 |  |  |  |  | - |  |  | - |  |  |  |  | (10,603) |  |  | 28.92 |  |  |
Outstanding, end of year | 194,521 |  | $ | 26.91 |  | $ | 362,754 |  | 206,463 |  | $ | 26.74 |  | $ | 477,640 |  | 219,540 |  | $ | 26.64 |  | $ | 146,970
Exercisable, end of year | 180,021 |  | $ | 26.78 |  | $ | 359,854 |  | 193,963 |  | $ | 26.59 |  | $ | 477,640 |  | 190,940 |  | $ | 26.58 |  | $ | 146,900
Schedule of Fair Value Assumptions [Table Text Block] |
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Dividend yield |  | 3.77% |  |  | 3.57% |  |  | 3.49%
Expected life |  | 10 years |  |  | 10 years |  |  | 10 years
Expected volatility |  | 24.35% |  |  | 24.97% |  |  | 25.91%
Risk-free interest rate |  | 2.28% |  |  | 2.17% |  |  | 3.01%
Weighted average fair value of options granted | $ | 4.89 |  | $ | 5.30 |  | $ | 5.72
Schedule of Outstanding Stock Options [Table Text Block] |
|  |  | Average |  |  |  |  |  | Average
| Options |  | Exercise |  | Remaining |  | Options |  | Exercise
| Outstanding |  | Price |  | Life, Years |  | Exercisable |  | Price
| 16,174 |  |  | 27.62 |  | 0.3 |  | 16,174 |  |  | 27.62
| 15,400 |  |  | 28.64 |  | 1.0 |  | 15,400 |  |  | 28.64
| 15,400 |  |  | 28.41 |  | 2.0 |  | 15,400 |  |  | 28.41
| 15,400 |  |  | 25.00 |  | 3.0 |  | 15,400 |  |  | 25.00
| 14,397 |  |  | 25.99 |  | 4.0 |  | 14,397 |  |  | 25.99
| 1,100 |  |  | 24.44 |  | 4.2 |  | 1,100 |  |  | 24.44
| 18,700 |  |  | 25.25 |  | 5.0 |  | 18,700 |  |  | 25.25
| 22,200 |  |  | 24.97 |  | 6.0 |  | 22,000 |  |  | 24.97
| 23,100 |  |  | 27.05 |  | 7.0 |  | 23,100 |  |  | 27.05
| 1,100 |  |  | 27.55 |  | 7.0 |  | 1,100 |  |  | 27.55
| 2,000 |  |  | 28.95 |  | 7.7 |  | 2,000 |  |  | 28.95
| 23,250 |  |  | 26.90 |  | 8.0 |  | 23,250 |  |  | 26.90
| 12,000 |  |  | 29.08 |  | 9.0 |  | 12,000 |  |  | 29.08
| 14,500 |  |  | 28.55 |  | 10.0 |  | - |  |  | -
Total | 194,521 |  |  |  |  |  |  | 180,021 |  |  |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | 2015 |  | 2014
|  |  |  | Weighted-Average |  |  |  | Weighted-Average
|  | Number of |  | Grant Date |  | Number of |  | Grant Date
|  | Shares |  | Fair Value |  | Shares |  | Fair Value
Non-vested, beginning of year |  | 9,300 |  | $29.08 |  | - |  | $0.00
Granted |  | 6,650 |  | 28.55 |  | 9,300 |  | 29.08
Vested |  | (1,860) |  | 29.08 |  | - |  | -
Forfeited |  | (280) |  | 29.08 |  | - |  | -
Non-vested at December 31 |  | 13,810 |  | $28.82 |  | 9,300 |  | $29.08

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