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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)
Mar. 31, 2023
USD ($)
year
Dec. 31, 2022
year
USD ($)
Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.080 0.076
Loans Held for Investment Reverse Mortgages | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 5.2 5.0
Loans Held for Investment Reverse Mortgages | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.175 0.180
Loans Held for Investment Reverse Mortgages | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.047 0.051
Loans Held for Investment Reverse Mortgages | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.9 1.0
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.123 0.132
Loans Held for Investment Reverse Mortgages | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 7.8 7.6
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.440 0.450
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.072 0.069
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.013 0.014
Fair Value Agency Mortgage Servicing Rights | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.096 0.096
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 72 72
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.079 0.079
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.105 0.101
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.105 0.106
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 205 201
HMBS-Related Borrowings | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 5.2 5.0
HMBS-Related Borrowings | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.175 0.180
HMBS-Related Borrowings | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.046 0.050
HMBS-Related Borrowings | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.9 1.0
HMBS-Related Borrowings | Minimum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.123 0.132
HMBS-Related Borrowings | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 7.8 7.6
HMBS-Related Borrowings | Maximum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.440 0.450
Mortgage Servicing Rights Pledged | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.076 0.076
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.073 0.071
Mortgage Servicing Rights Pledged | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.102 0.102
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 177 174