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Other Investments - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Investment partnership	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 partnership
Investment [Line Items]
Number of partnerships consolidated | partnership	2			2
Collateral amounts	$ 1,565,514	$ 1,379,856
Investment fair value gains (losses), net	(44,400)	(178,272)	$ 114,624
Other income, gains (losses)	12,886	21,204	12,018
Interest income	724,462	707,854	574,926
Mortgage servicing rights income (loss), net	7,033	14,879	2,380
Strategic investments
Investment [Line Items]
Investment fair value gains (losses), net	(3,000)	13,000	0
Other income, gains (losses)	$ (3,000)	(1,000)	1,000
Number of investments made | Investment	7
MSRs
Investment [Line Items]
Servicing asset, fair value	$ 24,877	25,421
Associated principal	2,030,000	2,190,000
RWT Horizons
Investment [Line Items]
Investments accounted for under the fair value option	3,000
Measurement alternative, fair value option	29,000
Carrying amount of equity method investments	$ 24,000
RWT Horizons | Strategic investments
Investment [Line Items]
Number of investments made | Investment	34
Investments	$ 21,000
BPL Bridge Loans | Strategic investments
Investment [Line Items]
Investments	4,000
Sale of investments	$ 79,000
Equity method investment, ownership percentage	20.00%
Equity Method Income, Joint Venture | Strategic investments
Investment [Line Items]
Sale of investments	$ 200
Asset Management Fees | Strategic investments
Investment [Line Items]
Sale of investments	100
Servicer advance financing
Investment [Line Items]
Collateral amounts	185,000
Income (loss) on investments	21,000	20,000	12,000
Investment fair value gains (losses), net	12,000	(11,000)	(1,000)
Held-for sale residential loans
Investment [Line Items]
Servicing asset, fair value	225,345	269,259
Servicing asset, unpaid principal balance on underlying loan	10,180,000
Excess MSRs
Investment [Line Items]
Servicing asset, fair value	37,367	39,035
Investment fair value gains (losses), net	(2,000)	(5,000)	8,000
Interest income	14,000	$ 16,000	$ 13,000
Fair value option elected aggregate carrying amount, asset	$ 0

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