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Short-Term Debt - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2024	Dec. 31, 2019	Dec. 31, 2023	Jul. 01, 2022
Short-term Debt [Line Items]
Average balance of short-term debt		$ 951,000
Accrued interest payable on short-term debt		4,000		$ 6,000
Short-term debt, net	[1]	1,251,444		1,558,222
Convertible notes
Short-term Debt [Line Items]
Repurchased debt instrument		27,000
Convertible notes, net
Short-term Debt [Line Items]
Short-term debt, net		$ 115,792		$ 142,558
Riverbend Funding, LLC | Minimum
Short-term Debt [Line Items]
Fixed interest rate (as a percentage)					6.00%
Riverbend Funding, LLC | Maximum
Short-term Debt [Line Items]
Fixed interest rate (as a percentage)					8.00%
Recourse Subordinate Securities Financing Receivable | Redwood
Short-term Debt [Line Items]
Long-term debt, weighted average interest rate, over time			4.21%
Recourse Subordinate Securities Financing Receivable | Redwood | October 2022 through September 2023
Short-term Debt [Line Items]
Long-term debt, weighted average interest rate, over time			5.71%
Recourse Subordinate Securities Financing Receivable | Redwood | October 2023 through September 2024
Short-term Debt [Line Items]
Long-term debt, weighted average interest rate, over time			7.21%
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At March 31, 2024 and December 31, 2023, assets of consolidated VIEs totaled $11,850,461 and $10,988,885, respectively. At March 31, 2024 and December 31, 2023, liabilities of consolidated VIEs totaled $10,921,862 and $10,096,308, respectively. See Note 4 for further discussion.

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