Loans - Schedule of Loans Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	$ 20,993,836	$ 13,557,074
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	14,850,996	8,610,434
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	6,041,544	4,877,177
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Total fair value of loans	101,296	69,463
Fair Value, Recurring \| Fair Value
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	20,216,371	13,155,622
Accumulated interest	131,816	75,257
Cumulative fair value adjustments	645,649	326,195
Total fair value of loans	20,993,836	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	77,147	34,424
Accumulated interest	3,735	1,511
Cumulative fair value adjustments	(63,920)	(28,354)
Total fair value of loans	16,962	7,581
Fair Value, Recurring \| Fair Value \| Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	14,177,004	8,283,400
Accumulated interest	105,156	55,673
Cumulative fair value adjustments	568,836	271,361
Total fair value of loans	14,850,996	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	68,432	27,989
Accumulated interest	3,400	1,207
Cumulative fair value adjustments	(58,676)	(25,022)
Total fair value of loans	13,156	4,174
Fair Value, Recurring \| Fair Value \| Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	5,929,047	4,794,517
Accumulated interest	26,497	19,433
Cumulative fair value adjustments	86,000	63,227
Total fair value of loans	6,041,544	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	8,502	6,435
Accumulated interest	335	304
Cumulative fair value adjustments	(5,104)	(3,332)
Total fair value of loans	3,733	3,407
Fair Value, Recurring \| Fair Value \| Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	110,320	77,705
Accumulated interest	163	151
Cumulative fair value adjustments	(9,187)	(8,393)
Total fair value of loans	101,296	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]
Unpaid principal balance	213	0
Accumulated interest	0	0
Cumulative fair value adjustments	(140)	0
Total fair value of loans	$ 73	$ 0

Financing Receivable, Cumulative Fair Value Adjustments

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Financing Receivable, Unpaid Principal, Before Allowance For Credit Loss

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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
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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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
-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

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-Section 45
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-Publisher FASB
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