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Stock Based Compensation (Tables)

12 Months Ended

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

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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
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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
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-Name Accounting Standards Codification
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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