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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)
Jun. 30, 2022
year
USD ($)
Dec. 31, 2021
USD ($)
year
Loans Held for Investment Reverse Mortgages | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 5.2 5.7
Loans Held for Investment Reverse Mortgages | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.173 0.160
Loans Held for Investment Reverse Mortgages | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.042 0.026
Loans Held for Investment Reverse Mortgages | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 1.1 1.0
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.119 0.112
Loans Held for Investment Reverse Mortgages | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 9.5 8.2
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.470 0.366
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.069 0.085
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.011 0.012
Fair Value Agency Mortgage Servicing Rights | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.085 0.085
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 70 71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.120 0.121
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.108 0.119
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.107 0.112
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 199 205
HMBS-Related Borrowings | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 5.2 5.7
HMBS-Related Borrowings | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.173 0.160
HMBS-Related Borrowings | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.042 0.025
HMBS-Related Borrowings | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 1.1 1.0
HMBS-Related Borrowings | Minimum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.119 0.112
HMBS-Related Borrowings | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 9.5 8.2
HMBS-Related Borrowings | Maximum | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.470 0.366
Mortgage Servicing Rights Pledged | Weighted average prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.102 0.109
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.074 0.088
Mortgage Servicing Rights Pledged | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.100 0.105
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 171 182