Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	$ 29,681,448	$ 22,745,783
Total loans held for sale, at lower of amortized cost or fair value	55,841	116,966
Total loans held for sale	29,737,289	22,862,749
Loans held for investment	16,920,564	13,657,578
Secured loans	1,275,529	1,516,736
Total loans held for investment	18,196,093	15,174,314
Total loans	47,933,382	38,037,063
Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	57,909	65,796
Personal loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	27,505,290	21,540,668
Total loans held for sale, at lower of amortized cost or fair value	55,841	116,966
Home loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	2,176,158	1,205,115
Student loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	16,920,564	13,657,578
Covered by financial guarantees	3,667,582	4,410,038
Student loans \| Student Loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	57,909	65,796
Secured loans
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	615,195	873,981
Credit card \| Credit card
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	479,972	467,854
Commercial and consumer banking:
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	180,362	174,901
Commercial and consumer banking: \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	163,613	159,265
Commercial and consumer banking: \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	3,847	4,161
Commercial and consumer banking: \| Residential real estate and other consumer
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	$ 12,902	$ 11,475

Financing Receivable, After Allowance For Credit Loss, Including Receivables At Fair Value And Excluding Held-For-Sale

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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