Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	$ 15,858,105	$ 13,557,074
Total loans held for investment, at amortized cost	328,029	307,957
Total loans	16,186,134	13,865,031
Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	1,164,464	931,701
Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	111,115	98,793
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	10,536,999	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	962,476	663,004
Student Loans \| Student loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	5,240,059	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	201,988	268,697
Home loans \| Home loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	81,047	69,463
Credit card \| Credit card
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	216,914	209,164
Commercial real estate \| Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	101,453	88,652
Commercial and industrial \| Commercial and consumer banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, at amortized cost	6,659	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	$ 3,003	$ 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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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

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-Topic 310
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-Section 45
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