Stock Option Plan (Details) (USD $)	12 Months Ended
Dec. 31, 2012
Number of options:
Number of Options outstanding, beginning	63,408
Number of Options granted
Number of Options exercised
Number of Options forfeited or expired	4,500
Number of Options outstanding, ending	58,908
Number of Options exercisable	58,908
Weighted Average Exercise Price of Options outstanding, beginning	$ 13.95
Weighted Average Exercise Price of Options granted
Weighted Average Exercise Price of Options exercised
Weighted Average Exercise Price of Options forfeited or expired	$ 13.95
Weighted Average Exercise Price of Options outstanding, ending	$ 13.95
Weighted Average Exercise Price of Options exercisable	$ 13.95
Weighted Average Remaining Contractual Term:
Weighted Average Remaining Contractual Term of Options outstanding, ending	0 years 9 months
Weighted Average Remaining Contractual Term of Options exercisable	0 years 9 months
Aggregate Intrinsic Value:
Aggregate Intrinsic Value of Options outstanding, ending
Aggregate Intrinsic Value of Options exercisable

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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