Loans - Schedule of Loans Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Fair value of loans 90 days or more delinquent	$ 7,959,382	$ 5,952,972
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Fair value of loans 90 days or more delinquent	3,247,510	2,876,509
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Fair value of loans 90 days or more delinquent	135,262	212,709
Personal Loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Fair value of loans 90 days or more delinquent	3,977,612	2,054,850
Fair Value, Recurring \| Fair Value
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal	7,743,579	5,755,228
Accumulated interest	32,815	22,490
Cumulative fair value adjustments	182,988	175,254
Fair value of loans 90 days or more delinquent	7,959,382	5,952,972
Fair Value, Recurring \| Fair Value \| Fair Value of Loans 90 Days or More Delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal	9,632	6,354
Accumulated interest	322	181
Cumulative fair value adjustments	(7,999)	(5,054)
Fair value of loans 90 days or more delinquent	1,955	1,481
Fair Value, Recurring \| Fair Value \| Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal	3,657,693	3,356,344
Accumulated interest	9,601	9,990
Cumulative fair value adjustments	47,081	84,503
Fair value of loans 90 days or more delinquent	3,714,375	3,450,837
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	1,372	1,589
Accumulated interest	18	32
Cumulative fair value adjustments	(733)	(865)
Fair value of loans 90 days or more delinquent	657	756
Fair Value, Recurring \| Fair Value \| Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal	142,118	210,111
Accumulated interest	159	190
Cumulative fair value adjustments	(7,015)	2,408
Fair value of loans 90 days or more delinquent	135,262	212,709
Fair Value, Recurring \| Fair Value \| Personal Loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal	3,943,768	2,188,773
Accumulated interest	23,055	12,310
Cumulative fair value adjustments	142,922	88,343
Fair value of loans 90 days or more delinquent	4,109,745	2,289,426
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	8,260	4,765
Accumulated interest	304	149
Cumulative fair value adjustments	(7,266)	(4,189)
Fair value of loans 90 days or more delinquent	$ 1,298	$ 725

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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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-Publisher FASB
-Name Accounting Standards Codification
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