Fair Value Measurement - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Line of credit receivable	$ 111,916	$ 112,742
Notes receivable and residual certificates	105,066	97,416
Payable to securitization note holders (at fair value)	39,188	46,542
Loan servicing assets (at fair value)	45,437	40,941
Loan servicing liabilities (at fair value)	6,646	4,383
Beneficial interest assets (at fair value)	474,796	396,216
Beneficial interest liabilities	3,200	5,100
Trailing fee liability (at fair value)	5,980	5,761
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Line of credit receivable	111,916	112,742
Notes receivable and residual certificates	105,066	97,416
Payable to securitization note holders (at fair value)	39,188	46,542
Loan servicing assets (at fair value)	45,437	40,941
Loan servicing liabilities (at fair value)	6,646	4,383
Beneficial interest assets (at fair value)	474,796	396,216
Beneficial interest liabilities	$ 3,235	$ 5,075