v3.26.1
Fair Value - Schedule of Significant Assumptions used in Valuation (Details)
Mar. 31, 2026
year
USD ($)
Dec. 31, 2025
year
USD ($)
Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.094 0.098
Loans Held for Investment Reverse Mortgages | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.049 0.048
Loans Held for Investment Reverse Mortgages | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.8 0.6
Loans Held for Investment Reverse Mortgages | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.131 0.131
Loans Held for Investment Reverse Mortgages | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 7.8 7.8
Loans Held for Investment Reverse Mortgages | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.260 0.266
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 4.7 4.7
Loans Held for Investment Reverse Mortgages | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.190 0.189
Fair Value Agency Mortgage Servicing Rights | Minimum | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.041 0.040
Fair Value Agency Mortgage Servicing Rights | Minimum | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.047 0.057
Fair Value Agency Mortgage Servicing Rights | Minimum | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.088 0.089
Fair Value Agency Mortgage Servicing Rights | Minimum | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.104 0.105
Fair Value Agency Mortgage Servicing Rights | Minimum | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.015 0.004
Fair Value Agency Mortgage Servicing Rights | Minimum | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.096 0.048
Fair Value Agency Mortgage Servicing Rights | Minimum | Cost to service (in dollars) | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 71 67
Fair Value Agency Mortgage Servicing Rights | Minimum | Cost to service (in dollars) | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 110 92
Fair Value Agency Mortgage Servicing Rights | Maximum | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.085 0.100
Fair Value Agency Mortgage Servicing Rights | Maximum | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.090 0.106
Fair Value Agency Mortgage Servicing Rights | Maximum | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.090 0.151
Fair Value Agency Mortgage Servicing Rights | Maximum | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.134 0.150
Fair Value Agency Mortgage Servicing Rights | Maximum | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.020 0.010
Fair Value Agency Mortgage Servicing Rights | Maximum | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.128 0.091
Fair Value Agency Mortgage Servicing Rights | Maximum | Cost to service (in dollars) | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 73 69
Fair Value Agency Mortgage Servicing Rights | Maximum | Cost to service (in dollars) | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 225 108
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.064 0.068
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.068 0.077
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.088 0.092
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.105 0.106
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.018 0.005
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.114 0.056
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Cost to service (in dollars) | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 72 67
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Cost to service (in dollars) | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 118 96
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.043 0.054
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.114 0.095
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.119 0.090
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 174 158
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.073 0.075
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.127 0.145
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.159 0.177
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 218 189
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.051 0.064
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.119 0.104
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.126 0.120
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 182 173
HMBS - Related Borrowings | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.048 0.047
HMBS - Related Borrowings | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.8 0.6
HMBS - Related Borrowings | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.131 0.131
HMBS - Related Borrowings | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 7.8 7.8
HMBS - Related Borrowings | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.260 0.266
HMBS - Related Borrowings | Weighted Average | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 4.7 4.7
HMBS - Related Borrowings | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.190 0.189
Mortgage Servicing Rights Pledged | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 5.2 5.2
Mortgage Servicing Rights Pledged | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.054 0.052
Mortgage Servicing Rights Pledged | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.094 0.096
Mortgage Servicing Rights Pledged | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.038 0.033
Mortgage Servicing Rights Pledged | Cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 127 124