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Short-term Borrowings and Long-term Debt - Schedule of Notes, Certificates and Secured Borrowings at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total retail notes, certificates and secured borrowings [1] $ 298,541 $ 636,774
Loans Held for Investment | Secured Borrowings    
Debt Instrument [Line Items]    
Loans pledged as collateral   800
Fair Value, Measurements, Recurring    
Debt Instrument [Line Items]    
Retail notes 283,141 583,219
Certificates 15,388 52,620
Secured borrowings 12 935
Total retail notes, certificates and secured borrowings $ 298,541 $ 636,774
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.