Fair Value Measurements - Unobservable Inputs Assumptions - Securitized Debt (Details) - Loans held for investment - Level 3 - Variable Interest Entities, Primary Beneficiary	Jun. 30, 2023	Dec. 31, 2022
Discount Rate | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.05	0.05
Discount Rate | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.09	0.10
Discount Rate | Weighted Average Borrowing Rates
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.065	0.064
Prepay Rate | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.06
Prepay Rate | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.15	0.15
Prepay Rate | Weighted Average Borrowing Rates
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.092	0.104
CDR | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.07
CDR | Weighted Average Borrowing Rates
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.009	0.012
Loss Severity | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.20	0.30
Loss Severity | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.55	0.60
Loss Severity | Weighted Average Borrowing Rates
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.420	0.458