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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Loans Held for Investment [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 5 years 9 months 18 days 6 years 4 months 24 days
Weighted average prepayment speed 14.70% 13.10%
Weighted average discount rate 3.70% 3.20%
Loans Held for Investment [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 2 years 9 months 18 days 4 years 4 months 24 days
Weighted average prepayment speed 6.30% 5.40%
Loans Held for Investment [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 7 years 7 months 6 days 8 years 1 month 6 days
Weighted average prepayment speed 41.30% 51.90%
Mortgage Servicing Rights - Amortized Costs [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed   8.80%
Weighted average delinquency rate   10.90%
Advance financing cost   5 years
Interest rate for computing float earnings   5 years
Weighted average discount rate   9.20%
Weighted average cost to service (in dollars)   108
Fair Value Agency Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed 8.10% [1] 8.10%
Weighted average delinquency rate 9.90% [1] 1.00%
Advance financing cost 5 years [1] 5 years
Interest rate for computing float earnings 5 years [1] 5 years
Weighted average discount rate 9.00% [1] 9.00%
Weighted average cost to service (in dollars) 105 [1] 64
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed 15.70% 16.60%
Weighted average delinquency rate 27.60% 28.50%
Fair value inputs financing costs float earnings, basis spread 0.50% 0.50%
Fair value input, interest rate 2.75% 2.75%
Weighted average discount rate 12.70% 13.00%
Weighted average cost to service (in dollars) 301 305
HMBS - Related Borrowings [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 5 years 9 months 18 days 6 years 4 months 24 days
Weighted average prepayment speed 14.70% 13.10%
Weighted average discount rate 3.70% 3.10%
HMBS - Related Borrowings [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 2 years 9 months 18 days 4 years 4 months 24 days
Weighted average prepayment speed 6.30% 5.40%
HMBS - Related Borrowings [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 7 years 7 months 6 days 8 years 1 month 6 days
Weighted average prepayment speed 41.30% 51.90%
Mortgage Servicing Rights Pledged [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed 16.10% 17.00%
Weighted average delinquency rate 28.10% 28.90%
Fair value inputs financing costs float earnings, basis spread 0.50% 0.50%
Fair value input, interest rate 2.75% 2.75%
Weighted average discount rate 13.70% 13.70%
Weighted average cost to service (in dollars) 307 311
London Interbank Offered Rate (LIBOR) [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Interest rate for computing float earnings 5 years 5 years
London Interbank Offered Rate (LIBOR) [Member] | Mortgage Servicing Rights Pledged [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Interest rate for computing float earnings 5 years 5 years
[1] Valuation assumptions for Agency MSRs at September 30, 2018 include assumptions for MSRs we carried at amortized cost at December 31, 2017. Effective January 1, 2018, we elected fair value accounting for our remaining MSRs that we had previously carried at amortized cost.