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Fair Value Measurements - Schedule of Loans HFI at Fair Value Activity and Aggregate Fair Value of HFI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of loans held for investment	$ 3,858,118		$ 3,858,118		$ 2,235,710
Balance at Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of loans held for investment	3,161,857		3,161,857		4,251,852
Loans held for investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,237,850	$ 818,882	473,314	$ 1,027,798
Originations	1,101,924	0	2,049,125	0
Purchases	58,600	0	86,235	12,744
Principal payments	(255,726)	(184,327)	(432,382)	(402,787)
Realized charge-offs, net of recoveries, recorded in earnings	(6,680)	(14,278)	(10,281)	(41,483)
Fair value adjustments recorded in earnings	(50,902)	11,459	(80,945)	35,464
Fair value at end of period	2,085,066	$ 631,736	2,085,066	$ 631,736
Fair value of loans held for investment	2,085,066		2,085,066		473,314
Loans held for investment | Balance at Fair Value | Off-balance Sheet Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Aggregate unpaid principal balance	2,189,229		2,189,229		495,649
Cumulative fair value adjustments	(104,163)		(104,163)		(22,335)
Fair value of loans held for investment	2,085,066		2,085,066		473,314
Loans held for investment | Balance at Fair Value | Off-balance Sheet Loans | 90 or more days past due
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Aggregate unpaid principal balance	6,292		6,292		5,177
Cumulative fair value adjustments	(5,171)		(5,171)		(4,183)
Fair value of loans held for investment	$ 1,121		$ 1,121		$ 994

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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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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