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
Mar. 31, 2024	Mar. 31, 2023
Liabilities
Net impact on earnings	$ (277,908)	$ 164,222
Elective repurchases	16,600
Securitization clean-up calls		39,900
Residual interests classified as debt
Liabilities
Fair value at beginning of period	(7,396)	(17,048)
Impact on Earnings	(73)	(89)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	3,340	1,572
Other Changes	0	0
Fair value at end of period	(4,129)	(15,565)
Loans at fair value
Assets
Fair value at beginning of period	22,056,057	13,557,074
Impact on Earnings	(286,543)	150,405
Purchases	16,580	40,591
Sales	(1,557,041)	(77,880)
Issuances	4,030,562	3,566,518
Settlements	(2,371,634)	(1,380,988)
Other Changes	3,185	2,385
Fair value at end of period	21,891,166	15,858,105
Personal loans
Assets
Fair value at beginning of period	15,330,573	8,610,434
Impact on Earnings	(269,426)	86,200
Purchases	16,580	40,039
Sales	(1,262,854)	0
Issuances	3,278,882	2,951,358
Settlements	(2,035,697)	(1,150,926)
Other Changes	(1,053)	(106)
Fair value at end of period	15,057,005	10,536,999
Student loans
Assets
Fair value at beginning of period	6,725,484	4,877,177
Impact on Earnings	(17,117)	64,699
Purchases	0	0
Sales	(294,187)	0
Issuances	751,680	525,373
Settlements	(335,937)	(229,681)
Other Changes	4,238	2,491
Fair value at end of period	6,834,161	5,240,059
Home loans
Assets
Fair value at beginning of period		69,463
Impact on Earnings		(494)
Purchases		552
Sales		(77,880)
Issuances		89,787
Settlements		(381)
Other Changes		0
Fair value at end of period		81,047
Servicing rights
Assets
Fair value at beginning of period	180,469	149,854
Impact on Earnings	5,226	12,084
Purchases	980	613
Sales	(53)	(135)
Issuances	75,554	954
Settlements	(21,424)	(16,856)
Other Changes	0	0
Fair value at end of period	240,752	146,514
Residual investments
Assets
Fair value at beginning of period	35,920	46,238
Impact on Earnings	732	1,104
Purchases	2,553	0
Sales	0	(306)
Issuances	0	0
Settlements	(3,352)	(4,076)
Other Changes	0	0
Fair value at end of period	35,853	42,960
Purchase price earn out
Assets
Fair value at beginning of period		54
Impact on Earnings		9
Purchases		0
Sales		0
Issuances		0
Settlements		(63)
Other Changes		0
Fair value at end of period		0
IRLCs
Assets
Fair value at beginning of period	2,155	216
Impact on Earnings	2,436	634
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(2,155)	(216)
Other Changes	0	0
Fair value at end of period	2,436	634
Student loan commitments
Assets
Fair value at beginning of period	5,465	(236)
Impact on Earnings	314	75
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(5,465)	236
Other Changes	0	0
Fair value at end of period	314	75
Third party warrants
Assets
Fair value at beginning of period	630	630
Impact on Earnings	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other Changes	0	0
Fair value at end of period	$ 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, Recurring Basis, Asset, Elective Repurchases

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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
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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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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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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