Long Term Debt - Schedule of Aggregate Principal Balance and Fair Value of Finance Receivables Pledged to Securitization Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Asset Pledged as Collateral without Right
Debt Instrument [Line Items]
Aggregate Principal Balance	$ 490,496	$ 84,477
Asset Pledged as Collateral with Right
Debt Instrument [Line Items]
Fair Value	430,022	77,904
United Auto Credit 2021-1 | Asset Pledged as Collateral without Right
Debt Instrument [Line Items]
Aggregate Principal Balance	57,829	84,477
United Auto Credit 2021-1 | Asset Pledged as Collateral with Right
Debt Instrument [Line Items]
Fair Value	54,464	$ 77,904
United Auto Credit 2022-2 | Asset Pledged as Collateral without Right
Debt Instrument [Line Items]
Aggregate Principal Balance	170,368
United Auto Credit 2022-2 | Asset Pledged as Collateral with Right
Debt Instrument [Line Items]
Fair Value	143,263
United Auto Credit 2023-1 | Asset Pledged as Collateral without Right
Debt Instrument [Line Items]
Aggregate Principal Balance	262,299
United Auto Credit 2023-1 | Asset Pledged as Collateral with Right
Debt Instrument [Line Items]
Fair Value	$ 232,295