Loans - Schedule of Loans Measured at Fair Value (Details) - Fair Value, Recurring - Fair Value - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 21,011,621	$ 13,155,622
Accumulated interest	148,990	75,257
Cumulative fair value adjustments	961,644	326,195
Total fair value of loans	22,122,255	13,557,074
Fair value of loans 90 days or more delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	90,532	34,424
Accumulated interest	4,216	1,511
Cumulative fair value adjustments	(75,460)	(28,354)
Total fair value of loans	19,288	7,581
Personal loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	14,498,629	8,283,400
Accumulated interest	114,541	55,673
Cumulative fair value adjustments	717,403	271,361
Total fair value of loans	15,330,573	8,610,434
Personal loans \| Fair value of loans 90 days or more delinquent \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	81,591	27,989
Accumulated interest	4,023	1,207
Cumulative fair value adjustments	(70,191)	(25,022)
Total fair value of loans	15,423	4,174
Student loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	6,445,586	4,794,517
Accumulated interest	34,357	19,433
Cumulative fair value adjustments	245,541	63,227
Total fair value of loans	6,725,484	4,877,177
Student loans \| Fair value of loans 90 days or more delinquent \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	8,446	6,435
Accumulated interest	187	304
Cumulative fair value adjustments	(5,021)	(3,332)
Total fair value of loans	3,612	3,407
Home loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	67,406	77,705
Accumulated interest	92	151
Cumulative fair value adjustments	(1,300)	(8,393)
Total fair value of loans	66,198	69,463
Home loans \| Fair value of loans 90 days or more delinquent \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	495	0
Accumulated interest	6	0
Cumulative fair value adjustments	(248)	0
Total fair value of loans	$ 253	$ 0

Financing Receivable, Cumulative Fair Value Adjustments

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Financing Receivable, Unpaid Principal, Before Allowance For Credit Loss

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Publisher FASB
-URI https://asc.fasb.org//310-10/tableOfContent

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