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Fair Value of Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable at fair value	$ 2,770,486,000		$ 2,778,523,000
Derivative asset	14,202,000		13,771,000
Derivative, underlying cash flows	16,800,000		$ 16,900,000
Transfers into level 3	0	$ 0
Transfers out of level 3	0	$ 0
Unsecured Personal Loans Receivable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable at fair value	2,569,700,000
Secured Personal Loans Receivable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable at fair value	$ 200,800,000

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