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Other Investments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) numberOfInvestment Investment	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) numberOfInvestment partnership Investment	Jun. 30, 2022 USD ($)	Dec. 31, 2018 partnership	Dec. 31, 2022 USD ($)
Net Investment Income [Line Items]
Number of partnerships consolidated | partnership			2		2
Collateral amounts	$ 1,480,062		$ 1,480,062			$ 1,379,856
Investment fair value changes, net	(4,596)	$ (87,972)	(4,723)	$ (94,092)
Investments	6,000		6,000
Other income, net	4,158	7,006	8,714	12,989
Interest income	178,981	167,455	357,497	356,855
MSR income, net	3,349	5,376	4,426	9,679
Strategic investments
Net Investment Income [Line Items]
Investment fair value changes, net	(3,000)	10,000	(3,000)	10,000
Other income, net	$ (1,000)	$ (300)	$ (1,000)	$ (200)
Strategic investments | RWT Horizons
Net Investment Income [Line Items]
Number of investments made | Investment	33		33
Investments	$ 23,000		$ 23,000
Strategic investments | Churchill Finance
Net Investment Income [Line Items]
Number of investments made | numberOfInvestment	6,000		6,000
MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	$ 26,242		$ 26,242			25,421
Aggregate principal balance	2,110,000		2,110,000			2,190,000
MSR income, net	3,000		4,000
Servicer advance financing
Net Investment Income [Line Items]
Collateral amounts	203,000		203,000
Income (loss) from equity method investments	5,000		10,000
Investment fair value changes, net	4,000		2,000
Held-for-sale residential loans
Net Investment Income [Line Items]
Mortgage servicing rights	234,304		234,304			269,259
Servicing asset, unpaid principal balance on underlying loan	10,740,000		10,740,000
Excess MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	39,877		39,877			$ 39,035
Investment fair value changes, net	1,000		1,000
Interest income	4,000		7,000
Fair value option elected aggregate carrying amount, asset	$ 0		$ 0

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