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Stock plans (Tables) | 12 Months Ended
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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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- 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 + Details
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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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