Fair Value Measurements - Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Liabilities
Net impact on earnings	$ (49,103)	$ 42,332	$ 66,685	$ 29,495
Securitization clean-up calls	0	129,733	39,936	465,472
Residual interests classified as debt
Liabilities
Fair value at beginning of period	(11,332)	(54,436)	(17,048)	(93,682)
Impact on Earnings	(927)	(1,453)	(414)	(7,078)
Purchases	0	0	(1,203)	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	2,065	10,155	8,471	55,026
Other Changes	0	0	0	0
Fair value at end of period	(10,194)	(45,734)	(10,194)	(45,734)
IRLCs
Liabilities
Fair value at beginning of period		1,120		3,759
Impact on Earnings		(927)		(2,846)
Purchases		0		0
Sales		0		0
Issuances		0		0
Settlements		(1,120)		(1,840)
Other Changes		0		0
Fair value at end of period		(927)		(927)
Student loan commitments
Liabilities
Fair value at beginning of period		(254)
Fair value at beginning of period				2,220
Impact on Earnings		(1,409)		(1,640)
Purchases		0		0
Sales		0		0
Issuances		0		0
Settlements		254		(1,989)
Other Changes		0		0
Fair value at end of period		(1,409)		(1,409)
Fair value at end of period		(1,409)		(1,409)
Loans at fair value
Assets
Fair value at beginning of period	18,213,667	7,959,382	13,557,074	5,952,972
Impact on Earnings	(59,325)	39,359	32,239	12,128
Purchases	22,317	1,277,469	197,484	1,627,941
Sales	(348,849)	(1,075,549)	(839,833)	(4,689,357)
Issuances	5,160,995	3,483,189	13,106,984	10,007,998
Settlements	(1,995,567)	(732,035)	(5,058,439)	(1,964,932)
Other Changes	598	(27,759)	(1,673)	(22,694)
Fair value at end of period	20,993,836	10,924,056	20,993,836	10,924,056
Personal loans
Assets
Fair value at beginning of period	12,751,163	4,109,745	8,610,434	2,289,426
Impact on Earnings	(45,072)	65,463	16,083	92,332
Purchases	20,724	1,276,175	61,053	1,504,112
Sales	(15,006)	(749,648)	(65,019)	(2,851,466)
Issuances	3,885,967	2,809,759	10,578,306	7,307,612
Settlements	(1,746,760)	(582,188)	(4,349,646)	(1,415,820)
Other Changes	(20)	(28,102)	(215)	(24,992)
Fair value at end of period	14,850,996	6,901,204	14,850,996	6,901,204
Student loans
Assets
Fair value at beginning of period	5,383,921	3,714,375	4,877,177	3,450,837
Impact on Earnings	(14,615)	(23,895)	17,278	(68,541)
Purchases	0	34	111,923	121,741
Sales	0	(74,080)	(96,678)	(877,920)
Issuances	919,330	457,184	1,840,070	1,839,710
Settlements	(247,751)	(148,913)	(706,429)	(543,077)
Other Changes	659	343	(1,797)	2,298
Fair value at end of period	6,041,544	3,925,048	6,041,544	3,925,048
Home loans
Assets
Fair value at beginning of period	78,583	135,262	69,463	212,709
Impact on Earnings	362	(2,209)	(1,122)	(11,663)
Purchases	1,593	1,260	24,508	2,088
Sales	(333,843)	(251,821)	(678,136)	(959,971)
Issuances	355,698	216,246	688,608	860,676
Settlements	(1,056)	(934)	(2,364)	(6,035)
Other Changes	(41)	0	339	0
Fair value at end of period	101,296	97,804	101,296	97,804
Servicing rights
Assets
Fair value at beginning of period	145,663	176,964	149,854	168,259
Impact on Earnings	7,419	6,182	28,428	26,860
Purchases	549	1,062	1,570	3,008
Sales	(132)	(3,965)	(1,257)	(5,552)
Issuances	4,143	10,681	11,580	42,299
Settlements	(14,988)	(22,486)	(47,521)	(66,436)
Other Changes	0	0	0	0
Fair value at end of period	142,654	168,438	142,654	168,438
Residual investments
Assets
Fair value at beginning of period	38,389	94,978	46,238	121,019
Impact on Earnings	434	664	1,240	1,716
Purchases	0	0	0	0
Sales	0	(490)	(807)	(710)
Issuances	0	0	0	0
Settlements	(3,367)	(8,318)	(11,215)	(35,191)
Other Changes	0	0	0	0
Fair value at end of period	35,456	86,834	35,456	86,834
Purchase price earn out
Assets
Fair value at beginning of period		625	54	4,272
Impact on Earnings		52	9	1,094
Purchases		0	0	0
Sales		0	0	0
Issuances		0	0	0
Settlements		(553)	(63)	(5,242)
Other Changes		0	0	0
Fair value at end of period	0	124	0	124
IRLCs
Assets
Fair value at beginning of period	1,352		216
Impact on Earnings	1,545		3,168
Purchases	0		363
Sales	0		0
Issuances	0		0
Settlements	(1,352)		(2,202)
Other Changes	0		0
Fair value at end of period	1,545		1,545
Student loan commitments
Assets
Fair value at beginning of period	189
Fair value at beginning of period			(236)
Impact on Earnings	1,751		2,015
Purchases	0		0
Sales	0		0
Issuances	0		0
Settlements	(189)		(28)
Other Changes	0		0
Fair value at end of period	1,751		1,751
Fair value at end of period	1,751		1,751
Third party warrants
Assets
Fair value at beginning of period	630	766	630	1,369
Impact on Earnings	0	(136)	0	(739)
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Other Changes	0	0	0	0
Fair value at end of period	$ 630	$ 630	$ 630	$ 630

Fair Value, Measurement With Unobservable Inputs Reconciliation, Including Transfers, Recurring Basis, Assets Value

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Including Transfers, Recurring Basis, Liability Value

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Gain (Loss) Included In Earnings

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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