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Servicing Assets (Key Economic Assumptions) (Details) - Mortgage related servicing assets [Member]
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Minimum [Member]    
Servicing Assets At Fair Value Line Items    
Constant prepayment rate 4.43% 4.51%
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 12.17% 11.39%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 12.00% 12.00%