Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Loan commitments, at fair value	$ 3,917			$ 2,584
Operating Lease, Expense	400	$ 300
Operating Lease, Right-of-Use Asset	5,773			3,279
Operating Lease, Liability	$ 6,089			$ 3,524
Operating Lease, Weighted Average Remaining Lease Term	7 years 6 months			5 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	8.85%			7.31%
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 802
Operating Leases, Future Minimum Payments, Due in Two Years	1,240
Operating Leases, Future Minimum Payments, Due in Three Years	1,237
Operating Leases, Future Minimum Payments, Due in Four Years	1,140
Operating Leases, Future Minimum Payments, Due in Five Years	929
Operating Leases, Future Minimum Payments, Due Thereafter	3,467
Operating Leases, Future Minimum Payments Due	8,815
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(2,726)
Investment in Other Loan Originator
Other Commitments [Line Items]
Unfunded commitment	5,500			$ 5,500
Mortgage Originator
Other Commitments [Line Items]
Unfunded commitment			$ 442,700	475,400
Maximum guarantees	50,000
Total Purchase Commitment	500,000
Amount outstanding under guarantee			$ 17,500	9,500
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
Equity investments in securitization-related risk retention vehicle
Other Commitments [Line Items]
Maximum guarantees	15,500
Drawn down amount being guaranteed	400			1,000
Reverse mortgage loans
Other Commitments [Line Items]
Contractual Obligation	2,000,000			1,900,000
Residential mortgage loans
Other Commitments [Line Items]
Unfunded commitment	343,300			288,000
Corporate loan [Member]
Other Commitments [Line Items]
Unfunded commitment	2,900			3,000
Corporate loan [Member] | Line of Credit
Other Commitments [Line Items]
Unfunded commitment	900			$ 900
Lending Commitment	$ 1,000