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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) Investment	Dec. 31, 2016 USD ($) Investment
Variable Interest Entity [Line Items]
Assets	$ 995,768	$ 798,317
Liabilities	945,873	773,980
Sequoia
Variable Interest Entity [Line Items]
Assets	995,768	798,317
Liabilities	$ 945,873	$ 773,980
Number of VIEs (in investments) | Investment	21	20
Sequoia | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 990,437	$ 791,636
Sequoia | Restricted cash
Variable Interest Entity [Line Items]
Assets	147	148
Sequoia | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	2,164	1,000
Sequoia | REO
Variable Interest Entity [Line Items]
Assets	3,020	5,533
Sequoia | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	1,585	518
Sequoia | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	944,288	773,462
Legacy Sequoia
Variable Interest Entity [Line Items]
Assets	677,199	798,317
Liabilities	$ 658,500	$ 773,980
Number of VIEs (in investments) | Investment	20	20
Legacy Sequoia | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 673,134	$ 791,636
Legacy Sequoia | Restricted cash
Variable Interest Entity [Line Items]
Assets	147	148
Legacy Sequoia | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	898	1,000
Legacy Sequoia | REO
Variable Interest Entity [Line Items]
Assets	3,020	5,533
Legacy Sequoia | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	540	518
Legacy Sequoia | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	657,960	773,462
Sequoia Choice
Variable Interest Entity [Line Items]
Assets	318,569	0
Liabilities	$ 287,373	$ 0
Number of VIEs (in investments) | Investment	1	0
Sequoia Choice | Residential loans held-for-investment, at Redwood
Variable Interest Entity [Line Items]
Assets	$ 317,303	$ 0
Sequoia Choice | Restricted cash
Variable Interest Entity [Line Items]
Assets	0	0
Sequoia Choice | Accrued interest receivable
Variable Interest Entity [Line Items]
Assets	1,266	0
Sequoia Choice | REO
Variable Interest Entity [Line Items]
Assets	0	0
Sequoia Choice | Accrued interest payable
Variable Interest Entity [Line Items]
Liabilities	1,045	0
Sequoia Choice | Asset-backed securities issued
Variable Interest Entity [Line Items]
Liabilities	$ 286,328	$ 0

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- Definition

Number of Variable Interest Entities, Acquired and Consolidated

+ References

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

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