Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified						12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Non-recurring basis Level 3	Dec. 31, 2011 Non-recurring basis Level 3	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Impaired loans	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Impaired loans Minimum	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Impaired loans Maximum	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets Minimum	Dec. 31, 2012 Non-recurring basis Level 3 Appraisal of collateral Foreclosed assets Maximum
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	$ 55,593	$ 76,283	$ 2,284	$ 4,905	$ 2,284
Foreclosed assets			$ 511	$ 794				$ 511
Appraisal adjustments (as a percent)						(12.00%)	(100.00%)		(51.70%)	(61.10%)