Fair Value Measurement (Details 1) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Investments [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Estimate	476
Investments [Member] | Appraisal of collateral [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Measurements, Valuation Techniques	Appraisal of collateral
Investments [Member] | Appraisal of collateral [Member] | Maximum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	30.00%
Fair Value Assumptions, Liquidation expense	12.00%
Investments [Member] | Appraisal of collateral [Member] | Minimum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	20.00%
Fair Value Assumptions, Liquidation expense	8.00%
Other real estate owned [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Estimate	464
Other real estate owned [Member] | Appraisal of collateral [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Measurements, Valuation Techniques	Appraisal of collateral
Other real estate owned [Member] | Appraisal of collateral [Member] | Maximum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	30.00%
Fair Value Assumptions, Liquidation expense	10.00%
Other real estate owned [Member] | Appraisal of collateral [Member] | Minimum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	10.00%
Fair Value Assumptions, Liquidation expense	0.00%
Impaired Loans [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Estimate	25,506
Impaired Loans [Member] | Appraisal of collateral [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Measurements, Valuation Techniques	Appraisal of collateral
Impaired Loans [Member] | Appraisal of collateral [Member] | Maximum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	30.00%
Fair Value Assumptions, Liquidation expense	10.00%
Fair Value Assumptions, Holding period	30 months
Impaired Loans [Member] | Appraisal of collateral [Member] | Minimum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Appraisal adjustments	10.00%
Fair Value Assumptions, Liquidation expense	0.00%
Fair Value Assumptions, Holding period	0 months
Impaired Loans [Member] | Discounted cash flows [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Measurements, Valuation Techniques	Discounted cash flows
Impaired Loans [Member] | Discounted cash flows [Member] | Maximum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Discount rates	8.40%
Impaired Loans [Member] | Discounted cash flows [Member] | Minimum [Member]
Quantitative Information about Level 3 Fair Value Measurements
Fair Value Assumptions, Discount rates	3.00%