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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	6.1	6.0
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.143	0.146
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.018	0.028
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1	2.4
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.104	0.078
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.2	7.8
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.341	0.283
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.149	0.117
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.047	0.032
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.095	0.093
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	96	85
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.115	0.122
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.277	0.273
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.114	0.113
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	271	277
HMBS-Related Borrowings | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	6.1	6.0
HMBS-Related Borrowings | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.143	0.146
HMBS-Related Borrowings | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.016	0.027
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1	2.4
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.104	0.078
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.2	7.8
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.341	0.283
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.116	0.119
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.294	0.203
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.117	0.107
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	286	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]
Measurement input	0.02	0.02
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]
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]
Measurement input	0.02	0.02
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]
Measurement input	0.005	0.005

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- 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

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- Definition

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+ References

No definition available.

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