Fair Value Measurement - Loans at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Fair value	$ 1,010,421	$ 252,477
Loans (at fair value)
Financing Receivable, Past Due [Line Items]
Outstanding principal balance	1,047,714	277,228
Net fair value and accrued interest adjustments	(37,293)	(24,751)
Fair value	1,010,421	252,477
Loans (at fair value) | Auto Loans
Financing Receivable, Past Due [Line Items]
Fair value	397,700	50,100
Loans > 90 Days Past Due | Loans (at fair value)
Financing Receivable, Past Due [Line Items]
Outstanding principal balance	9,006	1,979
Net fair value and accrued interest adjustments	(7,006)	(1,692)
Fair value	$ 2,000	$ 287