Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Estimated fair value of impaired loans on nonrecurring basis
Impaired loans, Carrying value	$ 12,546	$ 8,832
Impaired loans, Provision for (Reduction of) Loan Losses	$ 341	$ 335