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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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