Fair Value Measurements - Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Liabilities
Net impact on earnings	$ 224,116	$ 165,210
Securitization clean-up calls	39,936	518,659
Residual interests classified as debt
Liabilities
Fair value at beginning of period	(17,048)	(93,682)
Impact on Earnings	(425)	(6,608)
Purchases	(1,203)	0
Sales	0	0
Issuances	0	0
Settlements	11,280	83,242
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	(7,396)	(17,048)
Student loan commitments
Liabilities
Fair value at beginning of period	(236)	2,220
Impact on Earnings		(1,876)
Purchases		0
Sales		0
Issuances		0
Settlements		(580)
Other Changes		0
Fair value at end of period		(236)
Loans at fair value
Assets
Fair value at beginning of period	13,557,074	5,952,972
Impact on Earnings	175,654	134,078
Purchases	198,657	2,498,447
Sales	(2,064,295)	(4,884,392)
Issuances	17,428,597	12,985,381
Settlements	(7,172,046)	(3,064,074)
Other Changes	(1,386)	(65,338)
Transfers Out of Level 3	(66,198)
Fair value at end of period	22,056,057	13,557,074
Personal loans
Assets
Fair value at beginning of period	8,610,434	2,289,426
Impact on Earnings	(5,045)	129,132
Purchases	61,951	1,677,682
Sales	(938,403)	(2,911,491)
Issuances	13,801,065	9,773,705
Settlements	(6,197,997)	(2,322,634)
Other Changes	(1,432)	(25,386)
Transfers Out of Level 3	0
Fair value at end of period	15,330,573	8,610,434
Student loans
Assets
Fair value at beginning of period	4,877,177	3,450,837
Impact on Earnings	174,005	15,786
Purchases	111,923	817,864
Sales	(96,678)	(877,920)
Issuances	2,630,040	2,245,499
Settlements	(970,690)	(734,937)
Other Changes	(293)	(39,952)
Transfers Out of Level 3	0
Fair value at end of period	6,725,484	4,877,177
Home loans
Assets
Fair value at beginning of period	69,463	212,709
Impact on Earnings	6,694	(10,840)
Purchases	24,783	2,901
Sales	(1,029,214)	(1,094,981)
Issuances	997,492	966,177
Settlements	(3,359)	(6,503)
Other Changes	339	0
Transfers Out of Level 3	(66,198)	0
Fair value at end of period	0	69,463
Assets, Excluding Home Equity Loan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset transfers into level 3	0	0
Servicing rights
Assets
Fair value at beginning of period	149,854	168,259
Impact on Earnings	34,700	39,651
Purchases	2,464	3,712
Sales	(1,259)	(22,020)
Issuances	59,119	45,126
Settlements	(64,409)	(84,874)
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	180,469	149,854
Residual Investments
Assets
Fair value at beginning of period	46,238	121,019
Impact on Earnings	1,375	2,240
Purchases	3,235	0
Sales	(807)	(36,732)
Issuances	0	0
Settlements	(14,121)	(40,289)
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	35,920	46,238
IRLCs
Assets
Fair value at beginning of period	216	3,759
Impact on Earnings	5,323	(2,630)
Purchases	363	0
Sales	0	0
Issuances	0	0
Settlements	(3,747)	(913)
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	2,155	216
Student loan commitments
Assets
Fair value at beginning of period	(236)
Impact on Earnings	7,480
Purchases	0
Sales	0
Issuances	0
Settlements	(1,779)
Other Changes	0
Transfers Out of Level 3	0
Fair value at end of period	5,465	(236)
Third party warrants
Assets
Fair value at beginning of period	630	1,369
Impact on Earnings	0	(739)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	630	630
Purchase price earn-out
Assets
Fair value at beginning of period	54	4,272
Impact on Earnings	9	1,094
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(63)	(5,312)
Other Changes	0	0
Transfers Out of Level 3	0
Fair value at end of period	$ 0	$ 54

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

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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 transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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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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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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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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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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