Securitizations and Variable Interest Entities - Summary of Select Information Related to VIEs (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Assets
Restricted cash	[1]	$ 76,460	$ 103,522
Securities available for sale at fair value		263,530	142,226
Loans held for sale at fair value		142,370	121,902
Retail and certificate loans held for investment at fair value	[1]	229,719	636,686
Other loans held for investment at fair value		2,754,737	0
Other assets	[1]	302,546	187,399
Liabilities
Retail notes, certificates and secured borrowings at fair value	[1]	229,719	636,774
Payable on Structured Program borrowings	[1]	65,451	152,808
Other liabilities	[1]	303,951	244,551
Total liabilities		4,050,077	1,139,122
Consolidated VIEs
Assets
Restricted cash		13,462	15,983
Securities available for sale at fair value		0	0
Loans held for sale at fair value		41,734	98,190
Retail and certificate loans held for investment at fair value		10,281	52,620
Other loans held for investment at fair value		20,929	50,102
Other assets		584	1,270
Total assets		86,990	218,165
Liabilities
Retail notes, certificates and secured borrowings at fair value		10,281	52,620
Payable on Structured Program borrowings		65,451	152,808
Other liabilities		467	729
Total liabilities		76,199	206,157
Total net assets		10,791	12,008
Unconsolidated VIEs
Assets
Restricted cash		0	0
Securities available for sale at fair value		58,177	142,026
Loans held for sale at fair value		0	0
Retail and certificate loans held for investment at fair value		0	0
Other loans held for investment at fair value		0	0
Other assets		17,156	32,865
Total assets		75,333	174,891
Liabilities
Retail notes, certificates and secured borrowings at fair value		0	0
Payable on Structured Program borrowings		0	0
Other liabilities		0	0
Total liabilities		0	0
Total net assets		75,333	174,891
Total
Assets
Restricted cash		13,462	15,983
Securities available for sale at fair value		58,177	142,026
Loans held for sale at fair value		41,734	98,190
Retail and certificate loans held for investment at fair value		10,281	52,620
Other loans held for investment at fair value		20,929	50,102
Other assets		17,740	34,135
Total assets		162,323	393,056
Liabilities
Retail notes, certificates and secured borrowings at fair value		10,281	52,620
Payable on Structured Program borrowings		65,451	152,808
Other liabilities		467	729
Total liabilities		76,199	206,157
Total net assets		$ 86,124	$ 186,899

[1] Includes amounts in variable interest entities (VIEs) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included on the Consolidated Balance Sheets (Balance Sheet) above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. December 31,20212020Assets of consolidated VIEs, included in total assets aboveRestricted cash $13,462 $15,983 Loans held for sale at fair value41,734 98,190  Retail and certificate loans held for investment at fair value 10,281 52,620 Other loans held for investment at fair value20,929 50,102 Other assets 584 1,270 Total assets of consolidated VIEs$86,990 $218,165 Liabilities of consolidated VIEs, included in total liabilities aboveRetail notes, certificates and secured borrowings at fair value$10,281 $52,620 Payable on Structured Program borrowings65,451 152,808 Other liabilities467 729 Total liabilities of consolidated VIEs$76,199 $206,157