Fair Value Measurements, Fair Value Inputs, Quantitative Information (Details) (Fair Value, Inputs, Level 3 [Member])	9 Months Ended
	Sep. 30, 2012
Appraisal collateral - appraisal approach [Member] | Maximum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	35.00%
Appraisal collateral - appraisal approach [Member] | Maximum [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	15.00%
Appraisal collateral - appraisal approach [Member] | Minimum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	5.00%
Appraisal collateral - appraisal approach [Member] | Minimum [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	0.00%
Appraisal collateral - appraisal approach [Member] | Weighted Average [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	(24.00%)
Appraisal collateral - appraisal approach [Member] | Weighted Average [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	(13.00%)
Appraisal collateral - cost to sell approach [Member] | Maximum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	17.00%
Appraisal collateral - cost to sell approach [Member] | Maximum [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	7.00%
Appraisal collateral - cost to sell approach [Member] | Minimum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	6.00%
Appraisal collateral - cost to sell approach [Member] | Minimum [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	0.00%
Appraisal collateral - cost to sell approach [Member] | Weighted Average [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	(13.00%)
Appraisal collateral - cost to sell approach [Member] | Weighted Average [Member] | Foreclosed real estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate (in hundredths)	(6.00%)