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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Loans Held for Investment [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 5 years 10 months 24 days 6 years 4 months 24 days
Weighted average prepayment speed 14.40% 13.10%
Weighted average discount rate 3.50% 3.20%
Loans Held for Investment [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 3 years 3 months 18 days 4 years 4 months 24 days
Weighted average prepayment speed 6.10% 5.40%
Loans Held for Investment [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 9 years 8 years 1 month 6 days
Weighted average prepayment speed 45.80% 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 8.00% [1] 8.10%
Weighted average delinquency rate 10.30% [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) 106 [1] 64
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed 15.80% 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 12.90% 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 10 months 24 days 6 years 4 months 24 days
Weighted average prepayment speed 14.40% 13.10%
Weighted average discount rate 3.40% 3.10%
HMBS - Related Borrowings [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 3 years 3 months 18 days 4 years 4 months 24 days
Weighted average prepayment speed 6.10% 5.40%
HMBS - Related Borrowings [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Life 9 years 8 years 1 month 6 days
Weighted average prepayment speed 45.80% 51.90%
Mortgage Servicing Rights Pledged [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted average prepayment speed 16.20% 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 13.80% 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] aluation assumptions for Agency MSRs at June 30, 2018 include assumptions for MSRs we carried at amortized cost at December 31, 2017.