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Restricted Stock Units Issued (Detail) - Restricted Stock Units (RSUs) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Units |  |
Beginning Restricted Stock Units | 33,588 | 23,576
Restricted Stock Units Granted | 8,505 | 8,965
Dividend Equivalents Earned | 1,252 | 1,047
Restricted Stock Units Settled | 0 | 0
Ending Restricted Stock Units | 43,345 | 33,588
Weighted-Average Stock Price |  |
Beginning Restricted Stock Units | $ 31.83 | $ 29.90
Restricted Stock Units Granted | 38.51 | 36.54
Dividend Equivalents Earned | 41.00 | 35.01
Restricted Stock Units Settled | 0 | 0
Ending Restricted Stock Units | $ 33.40 | $ 31.83

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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