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Stock Plans - Additional Information (Details) - USD ($)			12 Months Ended
	Feb. 29, 2008	Jan. 03, 2006	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options under stock plan				30,827	25,227
Share based compensation expense			$ 69,000	$ 70,000	$ 25,000
Settlement of stock options				83,000
Restricted stock cost			$ 0	50,000
Share based compensation requisite service period			5 years
Restricted stock vested period			5 years
Unrecognized compensation expense			$ 0	$ 0
2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant as awards			129,207
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted					1,820
Unrecognized compensation expense			$ 108,000
SAR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options under stock plan			25,227
Stock appreciation rights granted	11,591	13,636
Strike price of per share	$ 27.50	$ 31.53
Expected volatility	22.21%	26.83%
Expected annual dividend yield	4.00%	2.42%
Risk-free interest rate	3.53%	0.90%
Expected term	7 years 6 months	1 year 9 months
Rights vesting period description			rights vested on a straight-line basis over a five year period
Stock appreciation rights vesting date			Jan. 02, 2011
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options under stock plan			5,600
Settlement of stock options			$ 83,000

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Restricted Stock Share Based Compensation Vesting Period

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Strike Price Per Share

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This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Unrecognized cost of unvested share-based compensation awards.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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