Loan Securitization/Sale Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Investing and Servicing Segment \| Residential Loans
Loan Transfer Activities
Loans held-for-sale face amount	$ 0	$ 0	$ 0	$ 0
Commercial and Residential Lending Segment
Loan Transfer Activities
Loans held-for-sale face amount	0		0
Commercial and Residential Lending Segment \| First mortgage loan participation
Loan Transfer Activities
Loans held-for-sale face amount		231,700,000		231,700,000
Loans held for sale, sold fair value		229,900,000		229,900,000
Investing and Servicing Loan Sales
Loan Transfer Activities
Loans held-for-sale face amount	43,500,000		77,900,000	18,000,000.0
Loans held for sale, sold fair value	45,600,000		80,600,000	18,600,000
Infrastructure Lending Segment
Loan Transfer Activities
Loans held-for-sale face amount	0	0	0	0
RMBS \| Variable Interest Entity
Loan Transfer Activities
Payments to acquire marketable securities	232,700,000	$ 0	232,700,000	$ 0
RMBS holdings \| Variable Interest Entity
Loan Transfer Activities
Payments to acquire marketable securities	82,100,000		82,100,000
RMBS certificates \| Variable Interest Entity
Loan Transfer Activities
Payments to acquire marketable securities	$ 150,600,000		$ 150,600,000