Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Summary of stock option activity under the Company's various stock option plans
Outstanding Shares, Beginning	419,350
Shares, Granted
Shares, Exercised
Shares, Cancelled/expired	(6,446)
Outstanding Shares, Closing	412,904	419,350
Shares, Exercisable	364,717
Weighted-Average Exercise Price, Outstanding, Beginning	$ 11.06
Weighted-Average Exercise Price, Cancelled/expired	$ 11.04
Weighted-Average Exercise Price, Outstanding, Ending	$ 11.06	$ 11.06
Weighted-Average Exercise Price, Exercisable	$ 11.67
Weighted-Average Remaining Contractual Term (in years), Outstanding, Beginning	2 years 7 months 6 days	2 years 10 months 24 days
Weighted-Average Remaining Contractual Term (in years), Outstanding, Ending	2 years 7 months 6 days	2 years 10 months 24 days
Weighted-Average Remaining Contractual Term (in years), Exercisable	2 years 6 months
Aggregated Intrinsic Value, Outstanding	$ 87
Aggregate Intrinsic Value, Exercisable	$ 64