Loans - Schedule of Loans Measured at Fair Value (Details) - Fair Value - Fair Value, Recurring - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 44,303,296	$ 34,251,986
Accumulated interest	271,655	214,244
Cumulative fair value adjustments	2,027,061	1,937,131
Total fair value of loans	46,602,012	36,403,361
Fair value of loans 90 days or more delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	122,396	123,547
Accumulated interest	5,648	5,670
Cumulative fair value adjustments	(98,631)	(99,732)
Total fair value of loans	29,413	29,485
Personal Loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	26,101,759	20,243,217
Accumulated interest	180,704	151,079
Cumulative fair value adjustments	1,222,827	1,146,372
Total fair value of loans	27,505,290	21,540,668
Personal Loans \| Fair value of loans 90 days or more delinquent \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	104,008	104,486
Accumulated interest	5,163	5,286
Cumulative fair value adjustments	(85,488)	(85,843)
Total fair value of loans	23,683	23,929
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	16,134,415	12,875,440
Accumulated interest	81,501	58,277
Cumulative fair value adjustments	704,648	723,861
Total fair value of loans	16,920,564	13,657,578
Student Loans \| Fair value of loans 90 days or more delinquent \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	17,164	18,141
Accumulated interest	420	384
Cumulative fair value adjustments	(12,874)	(13,512)
Total fair value of loans	4,710	5,013
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	2,067,122	1,133,329
Accumulated interest	9,450	4,888
Cumulative fair value adjustments	99,586	66,898
Total fair value of loans	2,176,158	1,205,115
Home Loans \| Fair value of loans 90 days or more delinquent \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	1,224	920
Accumulated interest	65	0
Cumulative fair value adjustments	(269)	(377)
Total fair value of loans	$ 1,020	$ 543

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
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-Name Accounting Standards Codification
-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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