Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	$ 20,993,836	$ 13,557,074
Total loans held for investment, at amortized cost	361,248	307,957
Total loans	21,355,084	13,865,031
Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	894,073	931,701
Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	114,007	98,793
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	14,850,996	8,610,434
Personal Loans \| Personal loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	618,829	663,004
Student Loans \| Student loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	6,041,544	4,877,177
Student Loans \| Student loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	275,244	268,697
Home loans \| Home loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	101,296	69,463
Credit card \| Credit card
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	247,241	209,164
Commercial real estate \| Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	104,743	88,652
Commercial and industrial \| Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	5,917	7,179
Residential real estate and other consumer \| Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	$ 3,347	$ 2,962

Financing Receivable, After Allowance For Credit Loss , Including Held-For-Sale

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- Definition

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.

+ References

No definition available.

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- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481852/948-310-45-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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