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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	5 years 10 months 24 days	6 years 4 months 24 days
Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Advance financing cost		5 years
Interest rate for computing float earnings		5 years
Weighted average cost to service (in dollars)		108
Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Advance financing cost	5 years	5 years
Interest rate for computing float earnings	5 years	5 years
Weighted average cost to service (in dollars)	90	64
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate for computing float earnings	5 years	5 years
Fair value inputs financing costs float earnings, basis spread	0.50%	0.50%
Fair value input, interest rate	2.75%	2.75%
Weighted average cost to service (in dollars)	297	305
Automotive Dealer Financing Notes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term		2 months 19 days
Fair value inputs average note rate		8.50%
Fair value inputs loan loss rate		21.50%
HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	5 years 10 months 24 days	6 years 4 months 24 days
Mortgage Servicing Rights Pledged [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate for computing float earnings	5 years
Fair value inputs financing costs float earnings, basis spread	0.50%	0.50%
Fair value input, interest rate	2.75%	2.75%
Weighted average cost to service (in dollars)	234	311
Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	14.70%	13.10%
Measurement Input, Prepayment Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions		8.80%
Measurement Input, Prepayment Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	8.50%	8.10%
Measurement Input, Prepayment Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	15.40%	16.60%
Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	14.70%	13.10%
Measurement Input, Prepayment Rate [Member] | Mortgage Servicing Rights Pledged [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	13.90%	17.00%
Measurement Input, Default Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions		10.90%
Measurement Input, Default Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	6.60%	1.00%
Measurement Input, Default Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	27.10%	28.50%
Measurement Input, Default Rate [Member] | Mortgage Servicing Rights Pledged [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	20.30%	28.90%
Measurement Input, Discount Rate [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	3.40%	3.20%
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions		9.20%
Measurement Input, Discount Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	9.10%	9.00%
Measurement Input, Discount Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	12.80%	13.00%
Measurement Input, Discount Rate [Member] | Automotive Dealer Financing Notes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions		10.00%
Measurement Input, Discount Rate [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	3.30%	3.11%
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights Pledged [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	12.00%	13.70%
LIBOR [Member] | Mortgage Servicing Rights Pledged [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate for computing float earnings		1 month
Minimum [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	3 years	4 years 4 months 24 days
Minimum [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	3 years	4 years 4 months 24 days
Minimum [Member] | Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	6.80%	5.40%
Minimum [Member] | Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	6.80%	5.40%
Maximum [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	7 years 7 months 6 days	8 years 1 month 6 days
Maximum [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value valuation assumptions, term	7 years 7 months 6 days	8 years 1 month 6 days
Maximum [Member] | Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	38.40%	51.90%
Maximum [Member] | Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Valuation Assumptions	38.40%	51.90%

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