Long Term Debt - Schedule of Securitization Debt of Consolidated VIEs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Debt Instrument [Line Items]
Initial Principal	$ 127,270
Outstanding Principal	98,484
Fair Value	$ 95,494
United Auto Credit 2021-1-B
Debt Instrument [Line Items]
Final Scheduled Payment Date	Mar. 11, 2024
Initial Principal	$ 33,540
Contractual Interest Rate	0.68%
Outstanding Principal	$ 4,754
Fair Value	$ 4,752
United Auto Credit 2021-1-C
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jun. 10, 2026
Initial Principal	$ 29,640
Contractual Interest Rate	0.84%
Outstanding Principal	$ 29,640
Fair Value	$ 29,352
United Auto Credit 2021-1-D
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jun. 10, 2026
Initial Principal	$ 29,380
Contractual Interest Rate	1.14%
Outstanding Principal	$ 29,380
Fair Value	$ 28,487
United Auto Credit 2021-1-E
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jun. 10, 2026
Initial Principal	$ 20,800
Contractual Interest Rate	2.58%
Outstanding Principal	$ 20,800
Fair Value	$ 19,517
United Auto Credit 2021-1-F
Debt Instrument [Line Items]
Final Scheduled Payment Date	Sep. 10, 2027
Initial Principal	$ 13,910
Contractual Interest Rate	4.30%
Outstanding Principal	$ 13,910
Fair Value	$ 13,386