Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	$ 15,116,482	$ 15,396,771
Loans held for investment, at fair value	6,834,161	6,725,484
Loans held for investment, after allowance for credit loss	1,250,231	836,159
Total loans held for investment	8,084,392	7,561,643
Total loans	23,200,874	22,958,414
Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	388,980	502,757
Loans held for investment, at fair value	158,191	221,461
Senior Secured Loans Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	845,794	446,463
Commercial and Consumer Banking
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	131,506	117,068
Personal loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	15,057,005	15,330,573
Personal loans \| Personal loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	388,980	502,757
Home loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	59,477	66,198
Student loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, at fair value	6,834,161	6,725,484
Covered by financial guarantees	2,343,557	2,459,103
Student loans \| Student Loans \| Variable Interest Entity, Primary Beneficiary
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale, at fair value	158,191	221,461
Credit card \| Credit card
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	272,931	272,628
Commercial real estate \| Commercial and Consumer Banking
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	122,612	106,326
Commercial and industrial \| Commercial and Consumer Banking
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	5,522	6,075
Residential real estate and other consumer \| Commercial and Consumer Banking
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment, after allowance for credit loss	$ 3,372	$ 4,667

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

+ References

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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-Topic 310
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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