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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
On-balance sheet assets, at fair value:
Maximum loss exposure	$ 349,997	$ 381,661
Principal balance of loans outstanding	10,580,216	8,364,148
Principal balance of loans 30 days delinquent	21,805	27,926
Interest-only, senior and subordinate securities, classified as trading
On-balance sheet assets, at fair value:
Securities	129,111	101,426
Subordinate securities, classified as AFS
On-balance sheet assets, at fair value:
Securities	162,314	219,255
Mortgage servicing rights
On-balance sheet assets, at fair value:
Securities	$ 58,572	$ 60,980

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This is the amount of the financial instruments that are considered delinquent (past due) at the end of the period.

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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