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Other Investments - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) numberOfInvestment Investment	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) numberOfInvestment partnership Investment	Sep. 30, 2022 USD ($)	Dec. 31, 2018 partnership	Dec. 31, 2022 USD ($)
Net Investment Income [Line Items]
Number of partnerships consolidated | partnership			2		2
Collateral amounts	$ 1,775,977,000		$ 1,775,977,000			$ 1,379,856,000
Investment fair value changes, net	(31,430,000)	$ (57,697,000)	(36,153,000)	$ (151,789,000)
Investments	6,000,000		6,000,000
Other income, net	2,346,000	4,027,000	11,060,000	17,016,000
Interest income	177,074,000	177,662,000	534,571,000	534,517,000
MSR income, net	1,747,000	2,890,000	6,173,000	12,569,000
Strategic investments
Net Investment Income [Line Items]
Investment fair value changes, net	100,000	1,000,000	(3,000,000)	11,000,000
Other income, net	$ (2,000,000)	$ (300,000)	$ (3,000,000)	$ (400,000)
Strategic investments | RWT Horizons
Net Investment Income [Line Items]
Number of investments made | Investment	35		35
Investments	$ 23,000,000		$ 23,000,000
Strategic investments | Churchill Finance
Net Investment Income [Line Items]
Number of investments made | numberOfInvestment	7,000		7,000
Strategic investments | BPL Bridge Loans
Net Investment Income [Line Items]
Investments	$ 1,600,000		$ 1,600,000
Sale of investments	$ 29,000,000
Equity method investment, ownership percentage	20.00%		20.00%
MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	$ 26,033,000		$ 26,033,000			25,421,000
Aggregate principal balance	2,070,000,000.00		2,070,000,000.00			2,190,000,000
MSR income, net	2,000,000		6,000,000
Servicer advance financing
Net Investment Income [Line Items]
Collateral amounts	185,000,000		185,000,000
Income (loss) from equity method investments	5,000,000		16,000,000
Investment fair value changes, net	4,000,000		6,000,000
Held-for-sale residential loans
Net Investment Income [Line Items]
Mortgage servicing rights	219,813,000		219,813,000			269,259,000
Servicing asset, unpaid principal balance on underlying loan	10,450,000,000		10,450,000,000
Excess MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	38,427,000		38,427,000			$ 39,035,000
Investment fair value changes, net	(1,000,000)		(1,000,000)
Interest income	3,000,000		11,000,000
Fair value option elected aggregate carrying amount, asset	$ 0		$ 0

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