Fair Value Measurement - Schedule of Significant Unobservable Inputs (Details) - Valuation Technique, Discounted Cash Flow - Fair Value, Inputs, Level 3	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Minimum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	5.86%	5.00%
Loans held in consolidated securitization	0.1083	0.0699
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.0616	0.0575
Payable to securitization note holders	0.1083	0.0699
Beneficial interest assets	6.50%	6.50%
Beneficial interest liabilities	10.40%	13.25%
Trailing fee liabilities	5.86%	5.00%
Minimum \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.01%	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	(9.06%)	(7.59%)
Beneficial interest liabilities	(7.94%)	(5.45%)
Trailing fee liabilities	0.02%	0.04%
Minimum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	1.08%	0.45%
Loans held in consolidated securitization	0.0724	0.0673
Notes receivable and residual certificates	0.0411	0.0411
Payable to securitization note holders	0.0724	0.0673
Beneficial interest assets	(9.30%)	(7.56%)
Beneficial interest liabilities	(2.62%)	(1.89%)
Trailing fee liabilities	0.97%	1.52%
Maximum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	13.00%	14.78%
Loans held in consolidated securitization	0.1500	0.1500
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.1300	0.1278
Payable to securitization note holders	0.1083	0.1040
Beneficial interest assets	14.50%	14.50%
Beneficial interest liabilities	12.75%	13.25%
Trailing fee liabilities	13.00%	14.78%
Maximum \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	91.50%	91.50%
Loans held in consolidated securitization	0.3568	0.3568
Notes receivable and residual certificates	0.6037	0.5028
Payable to securitization note holders	0.3568	0.3568
Beneficial interest assets	12.86%	13.42%
Beneficial interest liabilities	16.80%	9.18%
Trailing fee liabilities	73.64%	67.59%
Maximum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	99.75%	99.75%
Loans held in consolidated securitization	0.8984	0.8984
Notes receivable and residual certificates	0.9469	0.9577
Payable to securitization note holders	0.8984	0.8984
Beneficial interest assets	18.46%	15.50%
Beneficial interest liabilities	18.06%	8.36%
Trailing fee liabilities	94.69%	95.77%
Weighted Average \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	9.99%	9.51%
Loans held in consolidated securitization	0.1145	0.1043
Discount rate	0.0650	0.0650
Notes receivable and residual certificates	0.1109	0.1072
Payable to securitization note holders	0.1083	0.0965
Beneficial interest assets	12.39%	12.90%
Beneficial interest liabilities	12.69%	13.25%
Trailing fee liabilities	10.61%	10.15%
Weighted Average \| Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	16.54%	15.52%
Loans held in consolidated securitization	0.1625	0.1612
Notes receivable and residual certificates	0.2146	0.2110
Payable to securitization note holders	0.1625	0.1612
Beneficial interest assets	1.05%	0.89%
Beneficial interest liabilities	2.47%	1.90%
Trailing fee liabilities	19.86%	19.48%
Weighted Average \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	44.55%	43.41%
Loans held in consolidated securitization	0.4002	0.4050
Notes receivable and residual certificates	0.3410	0.3304
Payable to securitization note holders	0.4002	0.4050
Beneficial interest assets	3.00%	3.60%
Beneficial interest liabilities	2.39%	1.89%
Trailing fee liabilities	34.52%	34.59%