Loans - Schedule of Loans Measured at Fair Value (Details) - Fair Value, Recurring - Fair Value - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 20,950,389	$ 21,011,621
Accumulated interest	143,802	148,990
Cumulative fair value adjustments	856,452	961,644
Total fair value of loans	21,950,643	22,122,255
Fair value of loans 90 days or more delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	111,514	90,532
Accumulated interest	4,508	4,216
Cumulative fair value adjustments	(93,099)	(75,460)
Total fair value of loans	22,923	19,288
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	14,332,874	14,498,629
Accumulated interest	116,366	114,541
Cumulative fair value adjustments	607,765	717,403
Total fair value of loans	15,057,005	15,330,573
Personal Loans \| Fair value of loans 90 days or more delinquent \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	102,581	81,591
Accumulated interest	4,313	4,023
Cumulative fair value adjustments	(87,603)	(70,191)
Total fair value of loans	19,291	15,423
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	6,559,211	6,445,586
Accumulated interest	27,414	34,357
Cumulative fair value adjustments	247,536	245,541
Total fair value of loans	6,834,161	6,725,484
Student Loans \| Fair value of loans 90 days or more delinquent \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	8,735	8,446
Accumulated interest	184	187
Cumulative fair value adjustments	(5,397)	(5,021)
Total fair value of loans	3,522	3,612
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	58,304	67,406
Accumulated interest	22	92
Cumulative fair value adjustments	1,151	(1,300)
Total fair value of loans	59,477	66,198
Home Loans \| Fair value of loans 90 days or more delinquent \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	198	495
Accumulated interest	11	6
Cumulative fair value adjustments	(99)	(248)
Total fair value of loans	$ 110	$ 253

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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