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Related Party Transactions - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 10, 2023 USD ($) tranche $ / shares shares	Mar. 31, 2025 USD ($) $ / shares	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) $ / shares	Oct. 23, 2024 USD ($) $ / shares shares	Apr. 26, 2024 USD ($)	Jun. 16, 2023 USD ($)	Sep. 14, 2022 USD ($)
Related Party Transaction [Line Items]
Warrants issued (in shares) | shares	4,193,453
Warrants issued, exercise price (in USD per share) | $ / shares	$ 0.01	$ 0.01		$ 0.01
Interest expense		$ 57,403	$ 54,465
Interest income		220,221	230,590
Asset-backed borrowings at amortized cost		1,281,274		$ 984,333
Corporate financing		199,669		203,751
Personal Loans
Related Party Transaction [Line Items]
Loan origination commitment, next twelve months, maximum amount							$ 300,000
Asset-Backed Notes
Related Party Transaction [Line Items]
Original amount		$ 2,100,000		2,475,000
Asset-Backed Notes | Senior Secured Term Loans
Related Party Transaction [Line Items]
Original amount					$ 235,000
Beneficial Owner
Related Party Transaction [Line Items]
Warrants issued (in shares) | shares	4,193,453				2,426,503
Warrants issued, exercise price (in USD per share) | $ / shares	$ 0.01				$ 0.01
Ownership percentage in stocks (greater than)		10.00%
Loans receivable at fair value		$ 204,300		241,300
Asset-backed borrowings at amortized cost		213,000		247,900
Corporate financing		99,800		$ 101,900
Beneficial Owner | Personal Loans
Related Party Transaction [Line Items]
Loan origination commitment, maximum amount						$ 370,900
Financing receivable, transfers		0	400
Interest income		16,300	4,800
Beneficial Owner | New Corporate Financing Facility
Related Party Transaction [Line Items]
Proceeds from issuance of debt	$ 75,000
Number of tranches | tranche	4
Beneficial Owner | Corporate Financing Facility
Related Party Transaction [Line Items]
Interest expense		5,200	11,500
Beneficial Owner | Secured Borrowing Agreement
Related Party Transaction [Line Items]
Interest expense		$ 6,400	$ 6,500
Beneficial Owner | Term Loan | Senior Secured Term Loans
Related Party Transaction [Line Items]
Original amount								$ 150,000
Beneficial Owner | Asset-Backed Notes | Senior Secured Term Loans
Related Party Transaction [Line Items]
Original amount					$ 235,000

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