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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Jun. 30, 2021 USD ($) years	Dec. 31, 2020 USD ($) years
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.7	5.9
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.160	0.154
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.022	0.019
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1.2	0.9
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.108	0.106
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.4	8.0
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.329	0.288
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.091	0.118
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.021	0.030
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.086	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 | $	78	79
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.121	0.115
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.280	0.280
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.110	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 | $	272	270
HMBS-Related Borrowings | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.7	5.9
HMBS-Related Borrowings | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.160	0.154
HMBS-Related Borrowings | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.020	0.017
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1.2	0.9
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.108	0.106
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.4	8.0
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.329	0.288
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.117	0.115
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.294	0.298
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.110	0.114
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	285	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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