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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Mar. 31, 2022 USD ($) years	Dec. 31, 2021 years USD ($)
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.4	5.7
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.168	0.160
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.036	0.026
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1.0	1.0
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.119	0.112
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.4	8.2
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.464	0.366
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.072	0.085
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.011	0.012
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.084	0.085
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	70	71
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.121	0.121
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.111	0.119
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.107	0.112
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	205	205
HMBS-Related Borrowings | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.4	5.7
HMBS-Related Borrowings | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.168	0.160
HMBS-Related Borrowings | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.035	0.025
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	1.0	1.0
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.119	0.112
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	8.4	8.2
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.464	0.366
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.104	0.109
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.078	0.088
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.100	0.105
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	178	182

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=123874694&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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