Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Other Commitments [Line Items]
Loan commitments, at fair value	$ 8,827		$ 8,827		$ 6,692
Operating Lease, Expense	300	$ 400	900	$ 1,100
Operating Lease, Right-of-Use Asset	4,118		4,118		5,161
Operating Lease, Liability	$ 4,630		$ 4,630		$ 5,704
Operating Lease, Weighted Average Remaining Lease Term	7 years 2 months 12 days		7 years 2 months 12 days		7 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	9.19%		9.19%		8.87%
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 234		$ 234
Operating Leases, Future Minimum Payments, Due in Two Years	954		954
Operating Leases, Future Minimum Payments, Due in Three Years	964		964
Operating Leases, Future Minimum Payments, Due in Four Years	957		957
Operating Leases, Future Minimum Payments, Due in Five Years	948		948
Operating Leases, Future Minimum Payments, Due Thereafter	2,519		2,519
Operating Leases, Future Minimum Payments Due	6,576		6,576
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1,946)		(1,946)
Affiliated REIT
Other Commitments [Line Items]
Purchase Commitment, Amount Contributed	25,000		25,000
Investment in Other Loan Originator
Other Commitments [Line Items]
Unfunded commitment	30,500		30,500		$ 5,600
Mortgage Originator
Other Commitments [Line Items]
Unfunded commitment	359,500		359,500		369,000
Total Purchase Commitment			500,000
Mortgage loan originator
Other Commitments [Line Items]
Loan Purchase Commitments, at Fair Value	10		10		(1,600)
Mortgage loan originator | Equity Method Investee
Other Commitments [Line Items]
Loan Purchase Commitments, at Fair Value	48		48		(900)
Non-Exchange Traded Equity Investment in Mortgage Originators [Member] | Related party mortgage originator (with flow mortgage loan purchase and sale agreement)
Other Commitments [Line Items]
Maximum guarantees	15,000		15,000		15,000
Equity investments in securitization-related risk retention vehicle
Other Commitments [Line Items]
Maximum guarantees	15,500		15,500
Drawn down amount being guaranteed					1,000
Reverse mortgage loans
Other Commitments [Line Items]
Contractual Obligation	2,200,000		2,200,000		2,100,000
Loan Purchase Commitments
Other Commitments [Line Items]
UPB of loans committed to purchase	669,600		669,600		352,700
Loan Purchase Commitments | Equity Method Investee
Other Commitments [Line Items]
UPB of loans committed to purchase	135,600		135,600		136,000
Loan Purchase Commitments | Mortgage loan originator
Other Commitments [Line Items]
Loan Purchase Commitments, at Fair Value	100		100		(200)
UPB of loans committed to purchase	49,100		49,100		25,600
Loan Purchase Commitments | Mortgage loan originator B
Other Commitments [Line Items]
Loan Purchase Commitments, at Fair Value	(100)		(100)		(400)
UPB of loans committed to purchase	35,400		35,400		52,400
Residential mortgage loans
Other Commitments [Line Items]
Unfunded commitment	223,100		223,100		288,400
Corporate loan [Member]
Other Commitments [Line Items]
Unfunded commitment					2,600
Corporate loan [Member] | Line of Credit
Other Commitments [Line Items]
Unfunded commitment	$ 800		800		$ 900
Lending Commitment			$ 1,000