Loans - Schedule of Loans Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	$ 15,858,105	$ 13,557,074
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	10,536,999	8,610,434
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	5,240,059	4,877,177
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	81,047	69,463
Fair Value, Recurring \| Fair Value
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	15,216,504	13,155,622
Accumulated interest	89,998	75,257
Cumulative fair value adjustments	551,603	326,195
Total fair value of loans	15,858,105	13,557,074
Fair Value, Recurring \| Fair Value \| Fair Value of Loans 90 Days or More Delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	43,722	34,424
Accumulated interest	2,037	1,511
Cumulative fair value adjustments	(37,502)	(28,354)
Total fair value of loans	8,257	7,581
Fair Value, Recurring \| Fair Value \| Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	10,039,769	8,283,400
Accumulated interest	69,049	55,673
Cumulative fair value adjustments	428,181	271,361
Total fair value of loans	10,536,999	8,610,434
Fair Value, Recurring \| Fair Value \| Personal Loans \| Fair Value of Loans 90 Days or More Delinquent \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	37,754	27,989
Accumulated interest	1,731	1,207
Cumulative fair value adjustments	(34,219)	(25,022)
Total fair value of loans	5,266	4,174
Fair Value, Recurring \| Fair Value \| Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	5,086,953	4,794,517
Accumulated interest	20,787	19,433
Cumulative fair value adjustments	132,319	63,227
Total fair value of loans	5,240,059	4,877,177
Fair Value, Recurring \| Fair Value \| Student Loans \| Fair Value of Loans 90 Days or More Delinquent \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	5,968	6,435
Accumulated interest	306	304
Cumulative fair value adjustments	(3,283)	(3,332)
Total fair value of loans	2,991	3,407
Fair Value, Recurring \| Fair Value \| Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	89,782	77,705
Accumulated interest	162	151
Cumulative fair value adjustments	(8,897)	(8,393)
Total fair value of loans	81,047	69,463
Fair Value, Recurring \| Fair Value \| Home Loans \| Fair Value of Loans 90 Days or More Delinquent \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	$ 0	$ 0

Financing Receivable, Cumulative Fair Value Adjustments

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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

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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

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-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
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