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Fair Value Measurements - Rollforward of Loans held for investment and held for sale and Securitized Debt Measured at Estimated Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 3,826,505	$ 1,971,683	$ 2,766,951	$ 1,306,072
Originations	713,017	456,328	2,033,018	1,257,225
Loans liquidated	(155,963)	(93,065)	(437,624)	(232,615)
Acquisition		1,500		16,490
REO Transfer	(23,186)	(4,227)	(42,526)	(6,448)
Principal paydowns and payoffs	(19,519)	(12,784)	(43,707)	(26,586)
Unrealized gain included in net income	30,463	35,246	95,205	72,003
Loans transfer (to held for sale) from held for investment		(936)		(32,515)
Loans repurchased		973		1,092
Ending balance	4,371,317	2,354,718	4,371,317	2,354,718
Loans Held For Investment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Ending balance	4,371,317		4,371,317
Loans Held For Sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance				17,590
Originations	2,071	18,947	47,879	18,947
Loans liquidated		(936)	(46,953)	(49,366)
Principal paydowns and payoffs				(31)
Unrealized gain included in net income	519		519
Realized gain (loss) included in net income	0	284	1,145	(424)
Loans transfer (to held for sale) from held for investment		936		32,515
Ending balance	2,590	19,231	2,590	19,231
Securitized Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	3,232,769	1,509,952	2,207,408	877,417
Additions	666,237	286,966	2,022,738	1,005,044
Principal paydowns and payoffs	(160,105)	(72,645)	(512,511)	(165,150)
Total gain (loss) gain included in net income	9,988	24,995	31,254	31,957
Ending balance	$ 3,748,889	$ 1,749,268	$ 3,748,889	$ 1,749,268

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

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (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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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (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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