Loans - Schedule of Loans Measured at Fair Value (Details) - Fair Value - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 38,390,916	$ 34,251,986
Accumulated interest	237,680	214,244
Cumulative fair value adjustments	2,038,653	1,937,131
Total fair value of loans	40,667,249	36,403,361
Fair value of loans 90 days or more delinquent
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	121,200	123,547
Accumulated interest	5,533	5,670
Cumulative fair value adjustments	(97,807)	(99,732)
Total fair value of loans	28,926	29,485
Personal Loans \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	22,317,947	20,243,217
Accumulated interest	161,450	151,079
Cumulative fair value adjustments	1,203,024	1,146,372
Total fair value of loans	23,682,421	21,540,668
Personal Loans \| Fair value of loans 90 days or more delinquent \| Personal Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	105,579	104,486
Accumulated interest	5,145	5,286
Cumulative fair value adjustments	(86,679)	(85,843)
Total fair value of loans	24,045	23,929
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	14,510,630	12,875,440
Accumulated interest	69,285	58,277
Cumulative fair value adjustments	756,905	723,861
Total fair value of loans	15,336,820	13,657,578
Student Loans \| Fair value of loans 90 days or more delinquent \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	14,659	18,141
Accumulated interest	343	384
Cumulative fair value adjustments	(10,976)	(13,512)
Total fair value of loans	4,026	5,013
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	1,562,339	1,133,329
Accumulated interest	6,945	4,888
Cumulative fair value adjustments	78,724	66,898
Total fair value of loans	1,648,008	1,205,115
Home Loans \| Fair value of loans 90 days or more delinquent \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	962	920
Accumulated interest	45	0
Cumulative fair value adjustments	(152)	(377)
Total fair value of loans	$ 855	$ 543

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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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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