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Other Investments - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) partnership numberOfInvestment Investment	Mar. 31, 2023 USD ($)	Dec. 31, 2018 partnership	Dec. 31, 2023 USD ($)
Net Investment Income [Line Items]
Number of partnerships consolidated | partnership	2		2
Total Collateral for Long-Term Debt	$ 1,550,658			$ 1,565,514
(Decrease) increase in allowance for credit losses on AFS securities	21,837	$ (4,392)
Principal payments on real estate securities	294	255
Interest income	204,740	178,516
MSR income, net	4,225	$ 1,077
Strategic investments
Net Investment Income [Line Items]
(Decrease) increase in allowance for credit losses on AFS securities	$ 1,000
Number of investments made | numberOfInvestment	7,000
MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	$ 27,417			24,877
Aggregate principal balance	2,000,000			2,190,000
MSR income, net	$ 4,000
RWT Horizons | Strategic investments
Net Investment Income [Line Items]
Number of investments made | Investment	36
Investments	$ 22,000
Oaktree Capital Management, L.P. | Strategic investments
Net Investment Income [Line Items]
Investments	5,000
Sale of investments	$ 52,000
Equity method investment, ownership percentage	20.00%
Servicer advance financing
Net Investment Income [Line Items]
Total Collateral for Long-Term Debt	$ 176,000
Repayments received	9,000
Income (loss) from equity method investments	5,000
(Decrease) increase in allowance for credit losses on AFS securities	(1,000)
Held-for-sale residential loans
Net Investment Income [Line Items]
Mortgage servicing rights	216,033			225,345
Servicing asset, unpaid principal balance on underlying loan	9,920,000
Excess MSRs
Net Investment Income [Line Items]
Mortgage servicing rights	36,122			$ 37,367
(Decrease) increase in allowance for credit losses on AFS securities	(1,000)
Interest income	3,000
Fair value option elected aggregate carrying amount, asset	9,000
Construction Draws On Residential Investor Bridge Loans | Redwood
Net Investment Income [Line Items]
Principal payments on real estate securities	$ 15,000

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