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Other Investments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) investment	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) investment partnership	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Net Investment Income [Line Items]
Number of partnerships consolidated | partnership			2
Commitment to fund partnership	$ 148,000		$ 148,000		$ 148,000
Collateral amounts	1,124,750		1,124,750		1,306,932
Investment fair value changes, net	(57,697)	$ 26,077	(151,789)	$ 120,644
Investments	10,000		10,000
Other income, net	4,027	2,388	17,016	8,357
Interest income	177,662	$ 145,722	534,517	$ 412,722
Servicer advance financing
Net Investment Income [Line Items]
Collateral amounts	245,000		245,000
Equity investment income	5,000		15,000
Investment fair value changes, net	(4,000)		(10,000)
Held-for-sale residential loans
Net Investment Income [Line Items]
Mortgage servicing rights	274,934		274,934		350,923
Servicing asset, unpaid principal balance on underlying loan	11,680,000		11,680,000
Excess MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	40,452		40,452		44,231
Investment fair value changes, net	(400)		(4,000)
Interest income	4,000		12,000
Fair value option elected aggregate carrying amount, asset	0		5,000
Strategic investments
Net Investment Income [Line Items]
Investment fair value changes, net	1,000		11,000
Other income, net	$ 300		$ 400
Strategic investments | RWT Horizons
Net Investment Income [Line Items]
Number of investments made | investment	27		27
Investments	$ 24,000		$ 24,000
Strategic investments | Churchill Finance
Net Investment Income [Line Items]
Number of investments made | investment	6,000		6,000
MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	$ 24,796		$ 24,796		12,438
Aggregate principal balance	2,220,000		2,220,000		$ 2,120,000
MSR income (losses), net	$ 3,000		$ 13,000

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