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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	6.50	6.00
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.132	0.146
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.020	0.028
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	1.20	2.40
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.080	0.078
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	8.40	7.80
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.243	0.283
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.175	0.117
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.048	0.032
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.094	0.093
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	93	85
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.122	0.122
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.257	0.273
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.113	0.113
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	278	277
HMBS-Related Borrowings | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	6.50	6.00
HMBS-Related Borrowings | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.132	0.146
HMBS-Related Borrowings | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.018	0.027
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	1.20	2.40
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.080	0.078
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	8.40	7.80
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.243	0.283
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.123	0.119
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.277	0.203
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.114	0.107
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	292	223
5-Year Swap Rate | Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Advance Financing Cost, Basis Spread on Variable Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.02	0.0275
5-Year Swap Rate | Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Interest Rate for Computing Float Earnings, Basis Spread on Variable Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.005	0.005
5-Year Swap Rate | Mortgage Servicing Rights Pledged | Measurement Input, Advance Financing Cost, Basis Spread on Variable Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.0200	0.0275
5-Year Swap Rate | Mortgage Servicing Rights Pledged | Measurement Input, Interest Rate for Computing Float Earnings, Basis Spread on Variable Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input	0.005	0.005

X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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