Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified						3 Months Ended			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Non-recurring basis Level 3	Dec. 31, 2012 Non-recurring basis Level 3	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Impaired loans	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Impaired loans Minimum	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Impaired loans Maximum	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets Minimum	Mar. 31, 2013 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets Maximum
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	$ 51,477	$ 55,593	$ 2,669	$ 2,284	$ 2,669
Foreclosed assets			$ 123	$ 511				$ 123
Appraisal adjustments (as a percent)						(2.30%)	(100.00%)		(38.20%)	(100.00%)