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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Mar. 31, 2021 years USD ($)	Dec. 31, 2020 years USD ($)
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.5	5.9
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.165	0.154
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.024	0.019
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.9	0.9
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.107	0.106
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.9	8.0
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.376	0.288
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.100	0.118
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.026	0.030
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.092	0.092
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	76	79
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.114	0.115
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.278	0.280
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.115	0.114
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	270	270
HMBS-Related Borrowings | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.9	5.9
HMBS-Related Borrowings | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.165	0.154
HMBS-Related Borrowings | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.023	0.017
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.9	0.9
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.107	0.106
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.0	8.0
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.376	0.288
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.114	0.115
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.295	0.298
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.115	0.114
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	286	287

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

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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.

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