Residential Consumer Loans - Schedule of Activity of Residential Consumer Loans Held-for-Sale (Details) - Residential Consumer Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans acquired	$ 6,159,685	$ 2,976,206	$ 12,741,522	$ 5,313,391
Principal balance of loans sold	1,583,458	841,238	3,154,007	1,261,751
Principal balance of loans transferred to consolidated securitization entities (transferred from HFS to HFI)	3,730,360	2,049,465	8,319,852	3,673,365
Unconsolidated Aspire Securitization
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans sold	$ 919,505	$ 0	$ 1,310,782	$ 0