v3.24.1.u1
Fair Value - Schedule of Quantitative Information for Level 3 Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities $ 100,319 $ 102,368
Domestic servicing rights 19,612 19,384
VIE assets 66,169,669 69,504,196
VIE liabilities 59,129,488 62,481,214
Primary Beneficiary    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Woodstar Fund investments 2,008,937 2,012,833
VIE assets 48,000  
VIE liabilities 10,200  
Fair value measurements on recurring basis | Loans under fair value option    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option 2,642,219 2,645,637
Fair value measurements on recurring basis | RMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities 100,319 102,368
Fair value measurements on recurring basis | CMBS    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Available-for-sale securities 19,486 18,600
Fair value measurements on recurring basis | Woodstar Fund investments    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Woodstar Fund investments 2,008,937 2,012,833
Fair value measurements on recurring basis | Domestic servicing rights    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 19,612 19,384
Fair value measurements on recurring basis | VIE assets | Primary Beneficiary    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE assets 41,633,853 43,786,356
Fair value measurements on recurring basis | VIE liabilities | Primary Beneficiary    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE liabilities 40,065,423 42,175,734
Fair value measurements on recurring basis | Level III | Loans under fair value option    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loans under fair value option $ 2,642,219 $ 2,645,637
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 4 years 4 years 3 months 18 days
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 0.02 0.05
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 38 years 3 months 18 days 38 years 6 months
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 0.101 0.099
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 900 900
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 0.93 1.40
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 1.086
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 26 years 6 months 27 years 4 months 24 days
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 0.046 0.045
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 749 749
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 0.65 0.68
Fair value measurements on recurring basis | Level III | Loans under fair value option | 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 1.014
Fair value measurements on recurring basis | 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 $ 100,319 $ 102,368
Loss severity for specified percentage of portfolio (as a percent) 3.00% 5.00%
Fair value measurements on recurring basis | Level III | RMBS | Minimum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loss severity for specified percentage of portfolio (as a percent) 45.00% 45.00%
Fair value measurements on recurring basis | 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 0.029
Fair value measurements on recurring basis | 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 0.010 0.010
Fair value measurements on recurring basis | 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
Fair value measurements on recurring basis | 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 0.09 0.08
Fair value measurements on recurring basis | 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 0.27 0.30
Fair value measurements on recurring basis | Level III | RMBS | Minimum | Annual coupon deterioration    
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
Fair value measurements on recurring basis | Level III | RMBS | Minimum | Putback amount per projected total collateral loss    
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
Fair value measurements on recurring basis | Level III | RMBS | Maximum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Loss severity for specified percentage of portfolio (as a percent) 80.00% 80.00%
Fair value measurements on recurring basis | 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 0.091 0.096
Fair value measurements on recurring basis | 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 0.041 0.042
Fair value measurements on recurring basis | 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 0.63 0.99
Fair value measurements on recurring basis | 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
Fair value measurements on recurring basis | 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 0.79 0.78
Fair value measurements on recurring basis | Level III | RMBS | Maximum | Annual coupon deterioration    
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 0.006 0.013
Fair value measurements on recurring basis | Level III | RMBS | Maximum | Putback amount per projected total collateral loss    
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 0.08 0.08
Fair value measurements on recurring basis | 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 0.052
Fair value measurements on recurring basis | 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 0.017 0.017
Fair value measurements on recurring basis | 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 0.13 0.17
Fair value measurements on recurring basis | 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 0.14 0.14
Fair value measurements on recurring basis | 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 0.51 0.51
Fair value measurements on recurring basis | Level III | RMBS | Weighted-average | Annual coupon deterioration    
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 0.001 0.001
Fair value measurements on recurring basis | Level III | RMBS | Weighted-average | Putback amount per projected total collateral loss    
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 0.005 0.005
Fair value measurements on recurring basis | 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 $ 19,486 $ 18,600
Fair value measurements on recurring basis | 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 days 0 years
Fair value measurements on recurring basis | 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
Fair value measurements on recurring basis | 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 4 months 24 days 6 years 8 months 12 days
Fair value measurements on recurring basis | 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 0.748 5.401
Fair value measurements on recurring basis | 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 2 years 3 months 18 days 2 years 4 months 24 days
Fair value measurements on recurring basis | 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 0.111 0.106
Fair value measurements on recurring basis | Level III | Woodstar Fund investments    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Woodstar Fund investments $ 2,008,937 $ 2,012,833
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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 0.0425  
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | Implied 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   0.0425
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.063
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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 0.030 0.030
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.048
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.070
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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 0.072 0.069
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.055
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.067
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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 0.055 0.054
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | 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   0.052
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | Weighted-average | 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 0.0425  
Fair value measurements on recurring basis | Level III | Woodstar Fund investments | Weighted-average | Implied 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   0.0425
Fair value measurements on recurring basis | Level III | Domestic servicing rights    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights $ 19,612 $ 19,384
Fair value measurements on recurring basis | Level III | Domestic servicing rights | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 0.0850 0.0850
Fair value measurements on recurring basis | Level III | Domestic servicing rights | 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
Fair value measurements on recurring basis | Level III | Domestic servicing rights | Weighted-average | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
Domestic servicing rights 0.0850 0.0850
Fair value measurements on recurring basis | Level III | Domestic servicing rights | 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
Fair value measurements on recurring basis | Level III | VIE assets | Minimum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 0 days 0 years
Fair value measurements on recurring basis | Level III | VIE assets | Minimum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE assets 0 0
Fair value measurements on recurring basis | Level III | VIE assets | Maximum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 9 years 8 months 12 days 10 years
Fair value measurements on recurring basis | Level III | VIE assets | Maximum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE assets 5.518 6.910
Fair value measurements on recurring basis | Level III | VIE assets | Weighted-average    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 2 years 1 year 9 months 18 days
Fair value measurements on recurring basis | Level III | VIE assets | Weighted-average | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE assets 0.252 0.159
Fair value measurements on recurring basis | Level III | VIE assets | Primary Beneficiary    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE assets $ 41,633,853 $ 43,786,356
Fair value measurements on recurring basis | Level III | VIE liabilities | Minimum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 0 days 0 years
Fair value measurements on recurring basis | Level III | VIE liabilities | Minimum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE liabilities 0 0
Fair value measurements on recurring basis | Level III | VIE liabilities | Maximum    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 9 years 8 months 12 days 10 years
Fair value measurements on recurring basis | Level III | VIE liabilities | Maximum | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE liabilities 5.518 6.910
Fair value measurements on recurring basis | Level III | VIE liabilities | Weighted-average    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE duration (in years) 1 year 8 months 12 days 1 year 8 months 12 days
Fair value measurements on recurring basis | Level III | VIE liabilities | Weighted-average | Debt yield    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE liabilities 0.156 0.114
Fair value measurements on recurring basis | Level III | VIE liabilities | Primary Beneficiary    
Quantitative information for Level 3 Fair Value Measurements for assets and liabilities measured at fair value on recurring basis    
VIE liabilities $ 5,358,517 $ 5,604,796