Long Term Debt - Schedule of Securitization Debt of Consolidated VIEs (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Initial Principal	$ 184,810
Outstanding Principal	169,830
Fair Value	$ 167,115
United Auto Credit 2020-1-D
Debt Instrument [Line Items]
Final Scheduled Payment Date	Feb. 10, 2025
Initial Principal	$ 31,450
Contractual Interest Rate	2.88%
Outstanding Principal	$ 27,677
Fair Value	$ 27,685
United Auto Credit 2020-1-E
Debt Instrument [Line Items]
Final Scheduled Payment Date	Feb. 10, 2025
Initial Principal	$ 18,730
Contractual Interest Rate	5.19%
Outstanding Principal	$ 18,730
Fair Value	$ 18,766
United Auto Credit 2020-1-F
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jan. 12, 2026
Initial Principal	$ 7,360
Contractual Interest Rate	9.08%
Outstanding Principal	$ 7,360
Fair Value	$ 7,359
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	$ 22,333
Fair Value	$ 22,266
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	$ 29,201
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	$ 28,417
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	$ 20,049
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	$ 13,372