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Servicing Assets (Key Economic Assumptions) (Details)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Constant prepayment rate 5.02% 4.38%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 10.00% 10.00%
Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Constant prepayment rate 19.08% 8.96%
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 15.50% 12.00%