Sales of Receivables and Servicing Rights - Servicing Rights and Residual Interests Economic Assumptions (Details) - bps	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fixed-rate
Schedule of Servicing Assets at Amortized Value
Weighted- Average Life (in years)	6 years 6 months	5 years 10 months 24 days
Prepayment Speed (annual) (as a percent)	10.70%	12.10%
OAS (bps)	693	727
Adjustable-rate
Schedule of Servicing Assets at Amortized Value
Weighted- Average Life (in years)	2 years 8 months 12 days	3 years 9 months 18 days
Prepayment Speed (annual) (as a percent)	28.80%	18.30%
OAS (bps)	626	681