Fair Value Measurement - Schedule of Significant Unobservable Inputs (Details) - Valuation Technique, Discounted Cash Flow - Fair Value, Inputs, Level 3	Sep. 30, 2026	Dec. 31, 2025
Minimum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	5.94%	5.00%
Loans held in consolidated securitization	0.1119	0.0699
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.0624	0.0575
Payable to securitization note holders	0.1119	0.0699
Beneficial interest assets	6.50%	6.50%
Beneficial interest liabilities	11.50%	13.25%
Minimum \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.02%	0.01%
Loans held in consolidated securitization	0.0067	0.0067
Notes receivable and residual certificates	0.0038	0.0038
Payable to securitization note holders	0.0067	0.0067
Beneficial interest assets	(10.37%)	(7.59%)
Beneficial interest liabilities	(7.98%)	(5.45%)
Minimum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	1.07%	0.45%
Loans held in consolidated securitization	0.0700	0.0673
Notes receivable and residual certificates	0.0411	0.0411
Payable to securitization note holders	0.0700	0.0673
Beneficial interest assets	(3.27%)	(7.56%)
Beneficial interest liabilities	(9.93%)	(1.89%)
Maximum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	13.42%	14.78%
Loans held in consolidated securitization	0.1500	0.1500
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.1313	0.1278
Payable to securitization note holders	0.1119	0.1040
Beneficial interest assets	14.50%	14.50%
Beneficial interest liabilities	12.75%	13.25%
Maximum \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	92.21%	91.50%
Loans held in consolidated securitization	0.3603	0.3568
Notes receivable and residual certificates	0.6037	0.5028
Payable to securitization note holders	0.3603	0.3568
Beneficial interest assets	15.51%	13.42%
Beneficial interest liabilities	28.57%	9.18%
Maximum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	99.61%	99.75%
Loans held in consolidated securitization	0.8933	0.8984
Notes receivable and residual certificates	0.9474	0.9577
Payable to securitization note holders	0.8933	0.8984
Beneficial interest assets	19.84%	15.50%
Beneficial interest liabilities	28.50%	8.36%
Weighted Average \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	9.97%	9.51%
Loans held in consolidated securitization	0.1174	0.1043
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.1103	0.1072
Payable to securitization note holders	0.1119	0.0965
Beneficial interest assets	12.38%	12.90%
Beneficial interest liabilities	12.57%	13.25%
Weighted Average \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	17.56%	15.52%
Loans held in consolidated securitization	0.1634	0.1612
Notes receivable and residual certificates	0.2219	0.2110
Payable to securitization note holders	0.1634	0.1612
Beneficial interest assets	1.05%	0.89%
Beneficial interest liabilities	4.20%	1.90%
Weighted Average \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	42.70%	43.41%
Loans held in consolidated securitization	0.3912	0.4050
Notes receivable and residual certificates	0.3399	0.3304
Payable to securitization note holders	0.3912	0.4050
Beneficial interest assets	3.76%	3.60%
Beneficial interest liabilities	2.24%	1.89%