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Fair Value Measurements (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Fair Value Measurements (Textuals) [Abstract]        
Other real estate owned measured at fair value $ 25 $ 25   $ 47
Write down of Other Real Estate Owned   $ 2 $ 8 $ 8
Fair Value, Option, Quantitative Disclosures [Line Items]        
Closing ratio 82.00%      
Weighted average constant prepayment rate 15.00%      
Weighted average discount rate 10.10%      
MaximumMember
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Weighted average discount rate 40.00%      
MinimumMember
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Weighted average discount rate 0.00%