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Servicing Assets (Key Economic Assumptions) (Details) - Mortgage related servicing assets [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum [Member]      
Servicing Assets At Fair Value [Line Items]      
Constant prepayment rate 4.30% 3.94% 4.24%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 10.00% 10.00% 10.00%
Maximum [Member]      
Servicing Assets At Fair Value [Line Items]      
Constant prepayment rate 9.02% 8.49% 9.14%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 12.00% 12.00% 12.00%