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Earnings Per Common Share - Additional Information (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Disclosure Earning Per Share Additional Information [Abstract]
Options for aggregate common shares	232,000	232,000	232,000	197,000
Dilutive effect of stock options	10,918	1,328

- 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.

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