Securitizations and Variable Interest Entities - Summary of Select Information Related to VIEs (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Assets
Restricted cash	[1]	$ 66,285	$ 76,460
Securities available for sale at fair value		359,157	263,530
Retail and certificate loans held for investment at fair value	[1]	87,144	229,719
Other loans held for investment at fair value		4,503,726	2,754,737
Other assets	[1]	495,132	302,546
Loans held for sale at fair value		90,058	142,370
Total assets		6,775,074	4,900,319
Liabilities
Retail notes, certificates and secured borrowings at fair value	[1]	87,144	229,719
Payable on Structured Program borrowings	[1]	11,185	65,451
Other liabilities	[1]	320,055	303,951
Total liabilities		5,653,664	4,050,077
Consolidated VIEs
Assets
Restricted cash		8,600	13,462
Securities available for sale at fair value		0	0
Retail and certificate loans held for investment at fair value		2,940	10,281
Other loans held for investment at fair value		6,375	20,929
Other assets		218	584
Loans held for sale at fair value		0	41,734
Total assets		18,133	86,990
Liabilities
Retail notes, certificates and secured borrowings at fair value		2,940	10,281
Payable on Structured Program borrowings		11,185	65,451
Other liabilities		39	467
Total liabilities		14,164	76,199
Total net assets		3,969	10,791
Unconsolidated VIEs
Assets
Restricted cash		0	0
Securities available for sale at fair value		22,445	58,177
Retail and certificate loans held for investment at fair value		0	0
Other loans held for investment at fair value		0	0
Other assets		11,351	17,156
Loans held for sale at fair value			0
Total assets		33,796	75,333
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		33,796	75,333
Total
Assets
Restricted cash		8,600	13,462
Securities available for sale at fair value		22,445	58,177
Retail and certificate loans held for investment at fair value		2,940	10,281
Other loans held for investment at fair value		6,375	20,929
Other assets		11,569	17,740
Loans held for sale at fair value			41,734
Total assets		51,929	162,323
Liabilities
Retail notes, certificates and secured borrowings at fair value		2,940	10,281
Payable on Structured Program borrowings		11,185	65,451
Other liabilities		39	467
Total liabilities		14,164	76,199
Total net assets		$ 37,765	$ 86,124

[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed 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. September 30, 2022December 31, 2021Assets of consolidated VIEs, included in total assets aboveRestricted cash$8,600 $13,462 Loans held for sale at fair value— 41,734  Retail and certificate loans held for investment at fair value 2,940 10,281 Other loans held for investment at fair value6,375 20,929 Other assets 218 584 Total assets of consolidated VIEs$18,133 $86,990 Liabilities of consolidated VIEs, included in total liabilities aboveRetail notes, certificates and secured borrowings at fair value$2,940 $10,281 Payable on Structured Program borrowings11,185 65,451 Other liabilities39 467 Total liabilities of consolidated VIEs$14,164 $76,199