Residential Consumer Loans - Schedule of Unsecuritized Residential Consumer Loans Held-for-Sale (Details) - Residential Consumer Loans - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
UPB	$ 3,004,597	$ 3,022,360
Fair value of loans	3,063,421	3,092,014
Market value of loans pledged as collateral under short-term borrowing agreements	$ 3,050,559	$ 3,066,067
Weighted average coupon	6.47%	6.59%