Residential Whole Loans - Net Gain/(Loss) on Residential Whole Loans Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	$ (34,761)	$ 54,380
Residential whole loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(34,761)	54,380
Residential whole loans \| Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(19,385)	45,196
Residential whole loans \| Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(10,591)	6,747
Residential whole loans \| Business purpose loans \| Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	1,451	17,831
Residential whole loans \| Business purpose loans \| Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(2,106)	(9,149)
Residential whole loans \| Business purpose loans \| Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(9,936)	(1,935)
Residential whole loans \| Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(4,573)	949
Residential whole loans \| Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	$ (212)	$ 1,488