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Servicing Assets (Key Economic Assumptions) (Details) - Mortgage related servicing assets [Member]
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Minimum [Member]    
Servicing Assets At Fair Value Line Items    
Constant prepayment rate 5.49% 5.60%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 10.00% 10.00%
Maximum [Member]    
Servicing Assets At Fair Value Line Items    
Constant prepayment rate 10.58% 10.08%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 12.00% 12.00%