Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	$ 25,330,429	$ 22,745,783
Total loans held for sale, at lower of amortized cost or fair value	124,367	116,966
Total loans held for sale	25,454,796	22,862,749
Loans held for investment	15,336,820	13,657,578
Secured loans	1,381,174	1,516,736
Total loans held for investment	16,717,994	15,174,314
Total loans	42,172,790	38,037,063
Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	62,091	65,796
Personal loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	23,682,421	21,540,668
Total loans held for sale, at lower of amortized cost or fair value	124,367	116,966
Home loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for sale, at fair value	1,648,008	1,205,115
Student loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	15,336,820	13,657,578
Covered by financial guarantees	4,025,290	4,410,038
Student loans \| Student Loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	62,091	65,796
Secured loans
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	741,266	873,981
Credit card \| Credit card
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	465,471	467,854
Commercial and consumer banking:
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	174,437	174,901
Commercial and consumer banking: \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	157,926	159,265
Commercial and consumer banking: \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	3,988	4,161
Commercial and consumer banking: \| Residential real estate and other consumer
Loans and Leases Receivable Disclosure [Line Items]
Secured loans	$ 12,523	$ 11,475

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

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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-Section 45
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