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Stock Option Plans (Tables)

12 Months Ended

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

X

- 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

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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)

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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

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