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Fair Value - Significant Unobservable Inputs (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option $ 2,323,543 $ 2,516,008
Woodstar Fund investments 1,727,499 2,073,533
Domestic servicing rights 28,280 22,390
VIE assets 34,493,164 38,937,576
VIE liabilities 32,803,806 37,288,545
RMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities 88,283 93,806
CMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities 32,522 27,345
Level III    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 2,323,543 2,516,008
Woodstar Fund investments 1,727,499 2,073,533
Domestic servicing rights 28,280 22,390
VIE assets 34,493,164 38,937,576
VIE liabilities $ 3,831,053 $ 5,514,152
Level III | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 0.0900 0.0850
Level III | Implied direct capitalization rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.0499 0.0443
Level III | Discount rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 0.15 0.15
Level III | Minimum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option, duration 2 years 3 months 18 days 3 years 3 months 18 days
VIE assets duration 0 years 0 years
VIE liabilities duration 0 years 0 years
Level III | Minimum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.028 0.028
VIE assets 0 0
VIE liabilities 0 0
Level III | Minimum | FICO score    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 585 585
Level III | Minimum | LTV    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.01 0.04
Level III | Minimum | Purchase price    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.800 0.800
Level III | Minimum | Discount rate - properties    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.070 0.065
Level III | Minimum | Discount rate - debt    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.032 0.030
Level III | Minimum | Terminal capitalization rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.050 0.048
Level III | Maximum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option, duration 36 years 6 months 37 years 6 months
VIE assets duration 8 years 9 years
VIE liabilities duration 8 years 9 years
Level III | Maximum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.108 0.105
VIE assets 4.201 7.531
VIE liabilities 4.201 7.531
Level III | Maximum | FICO score    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 829 829
Level III | Maximum | LTV    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 1 0.93
Level III | Maximum | Purchase price    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 1.068 1.068
Level III | Maximum | Discount rate - properties    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.078 0.073
Level III | Maximum | Discount rate - debt    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.056 0.064
Level III | Maximum | Terminal capitalization rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.058 0.055
Level III | Weighted-average    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option, duration 25 years 6 months 25 years 10 months 24 days
VIE assets duration 3 years 3 months 18 days 2 years 7 months 6 days
VIE liabilities duration 2 years 10 months 24 days 2 years
Level III | Weighted-average | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.045 0.046
Domestic servicing rights 0.0900 0.0850
VIE assets 0.221 0.264
VIE liabilities 0.121 0.171
Level III | Weighted-average | FICO score    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 750 750
Level III | Weighted-average | LTV    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 0.63 0.64
Level III | Weighted-average | Purchase price    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 1.013 1.013
Level III | Weighted-average | Discount rate - properties    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.075 0.070
Level III | Weighted-average | Discount rate - debt    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.049 0.047
Level III | Weighted-average | Terminal capitalization rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.055 0.052
Level III | Weighted-average | Implied direct capitalization rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.0499 0.0443
Level III | Weighted-average | Discount rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 0.15 0.15
Level III | RMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities $ 88,283 $ 93,806
Level III | RMBS | Minimum | Constant prepayment rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.022 0.022
Level III | RMBS | Minimum | Constant default rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.007 0.008
Level III | RMBS | Minimum | Loss severity    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0 0
Level III | RMBS | Minimum | Delinquency rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.07 0.08
Level III | RMBS | Minimum | Servicer advances    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.31 0.22
Level III | RMBS | Maximum | Constant prepayment rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.110 0.092
Level III | RMBS | Maximum | Constant default rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.075 0.033
Level III | RMBS | Maximum | Loss severity    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.81 0.62
Level III | RMBS | Maximum | Delinquency rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.24 0.25
Level III | RMBS | Maximum | Servicer advances    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.70 0.78
Level III | RMBS | Weighted-average | Constant prepayment rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.046 0.045
Level III | RMBS | Weighted-average | Constant default rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.015 0.016
Level III | RMBS | Weighted-average | Loss severity    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.10 0.13
Level III | RMBS | Weighted-average | Delinquency rate    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.13 0.13
Level III | RMBS | Weighted-average | Servicer advances    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.49 0.51
Level III | CMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities $ 28,197 $ 27,345
Level III | CMBS | Minimum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
CMBS, term 0 years 0 years
Level III | CMBS | Minimum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0 0
Level III | CMBS | Maximum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
CMBS, term 6 years 8 months 12 days 6 years 8 months 12 days
Level III | CMBS | Maximum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.639 0.585
Level III | CMBS | Weighted-average    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
CMBS, term 1 year 3 months 18 days 2 years 2 months 12 days
Level III | CMBS | Weighted-average | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities, measurement input 0.107 0.126