Asset-Backed Securities Issued - Additional Information (Details)	9 Months Ended
Sep. 30, 2019
Asset-backed securities issued \| Contractual maturities of over five years
Debt Instrument [Line Items]
Contractual maturities of securities (in years)	5 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration