v3.26.3
Fair Value - Schedule of Significant Assumptions used in Valuation (Details)
Sep. 30, 2026
year
USD ($)
Dec. 31, 2025
year
USD ($)
Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.096 0.098
Loans Held for Sale - Fair Value | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.075 0.075
Loans Held for Sale - Fair Value | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.2 0.2
Loans Held for Sale - Fair Value | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.089 0.066
Loans Held for Sale - Fair Value | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 11.1 9.2
Loans Held for Sale - Fair Value | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.391 0.385
Loans Held for Sale - Fair Value | Weighted Average | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 1.8 1.8
Loans Held for Sale - Fair Value | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.327 0.251
Loans Held for Investment Reverse Mortgages | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.057 0.048
Loans Held for Investment Reverse Mortgages | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.3 0.6
Loans Held for Investment Reverse Mortgages | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.133 0.131
Loans Held for Investment Reverse Mortgages | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 6.2 7.8
Loans Held for Investment Reverse Mortgages | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.445 0.266
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 3.1 4.7
Loans Held for Investment Reverse Mortgages | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.273 0.189
Fair Value Agency Mortgage Servicing Rights | Minimum | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.039 0.040
Fair Value Agency Mortgage Servicing Rights | Minimum | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.029 0.057
Fair Value Agency Mortgage Servicing Rights | Minimum | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.099 0.089
Fair Value Agency Mortgage Servicing Rights | Minimum | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.105 0.105
Fair Value Agency Mortgage Servicing Rights | Minimum | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.017 0.004
Fair Value Agency Mortgage Servicing Rights | Minimum | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.082 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 69 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 105 92
Fair Value Agency Mortgage Servicing Rights | Maximum | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.071 0.100
Fair Value Agency Mortgage Servicing Rights | Maximum | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.076 0.106
Fair Value Agency Mortgage Servicing Rights | Maximum | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.101 0.151
Fair Value Agency Mortgage Servicing Rights | Maximum | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.147 0.150
Fair Value Agency Mortgage Servicing Rights | Maximum | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.021 0.010
Fair Value Agency Mortgage Servicing Rights | Maximum | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.118 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 120 108
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.056 0.068
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.043 0.077
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Discount rate | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.099 0.092
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Discount rate | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.120 0.106
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Delinquency | GSE    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.019 0.005
Fair Value Agency Mortgage Servicing Rights | Weighted Average | Delinquency | Ginnie Mae    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.105 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 114 96
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.033 0.054
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.104 0.095
Fair Value Non-Agency Mortgage Servicing Rights | Minimum | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.124 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 173 158
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.072 0.075
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.117 0.145
Fair Value Non-Agency Mortgage Servicing Rights | Maximum | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.148 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 208 189
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.046 0.064
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.109 0.104
Fair Value Non-Agency Mortgage Servicing Rights | Weighted Average | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.132 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 181 173
HMBS - Related Borrowings | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.057 0.047
HMBS - Related Borrowings | Minimum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.3 0.6
HMBS - Related Borrowings | Minimum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.133 0.131
HMBS - Related Borrowings | Maximum | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 6.2 7.8
HMBS - Related Borrowings | Maximum | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.445 0.266
HMBS - Related Borrowings | Weighted Average | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 3.1 4.7
HMBS - Related Borrowings | Weighted Average | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.273 0.189
Mortgage Servicing Rights Pledged | Life in years    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 4.8 5.2
Mortgage Servicing Rights Pledged | Prepayment speed    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.044 0.052
Mortgage Servicing Rights Pledged | Discount rate    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.101 0.096
Mortgage Servicing Rights Pledged | Delinquency    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input 0.037 0.033
Mortgage Servicing Rights Pledged | Cost to service (in dollars)    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Measurement input | $ 127.8 123.9