Stock-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of the status of the stock options
Outstanding Stock option, Beginning balance	107,375
Stock option, Exercised	(31,875)	(28,750)	(8,206)
Outstanding Stock option, Ending balance	75,500	107,375
Outstanding Weighted-average Exercise Price, Beginning balance	$ 15.75
Weighted-average Exercise Price, Exercised	$ 13.30
Outstanding Weighted-average Exercise Price, Ending balance	$ 16.79	$ 15.75
Options vested and exercisable	75,500
Fair value of options granted during 2012
Number of authorized stock-based awards available for grant	424,941

Share-based compensation arrangement by share-based payment award options granted in period fair value.

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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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

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- Definition

The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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- Definition

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

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

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