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Stock plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Plan

		2014					2013
				Weighted					Weighted
				Average					Average
December 31		Awards		Price			Awards		Price
Outstanding, beginning of year		30,827		$	30.37		25,227		$	29.66
Associated with merger							8,900			30.93
Granted
Settled		(30,827)		$	30.37		(3,150)			26.38
Forfeited							(150)			27.50
Outstanding, end of year							30,827			30.37
Exercisable, end of year							30,827		$	30.37

Schedule of Activity Related to Restricted Stock

Year Ended December 31		2015		2014		2013
Nonvested, January 1		14,309		17,245		15,425
Granted shares						1,820
Vested shares				2,936
Forfeited shares
Nonvested, December 31		14,309		14,309		17,245

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- References

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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

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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

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