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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Investment | Dec. 31, 2017 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 1,647,850 | $ 1,259,774
Liabilities | 1,546,066 | 1,167,157
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,647,850 | 1,259,774
Liabilities | $ 1,546,066 | $ 1,167,157
Number of VIEs (in investments) | Investment | 23 | 22
Sequoia | Residential loans held-for-investment, at Redwood |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,639,770 | $ 1,252,879
Sequoia | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 155 | 151
Sequoia | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,810 | 3,391
Sequoia | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,115 | 3,353
Sequoia | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 3,972 | 2,568
Sequoia | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 7 | 4
Sequoia | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,542,087 | 1,164,585
Legacy Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 630,167 | 637,184
Liabilities | $ 616,383 | $ 622,982
Number of VIEs (in investments) | Investment | 20 | 20
Legacy Sequoia | Residential loans held-for-investment, at Redwood |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 626,151 | $ 632,817
Legacy Sequoia | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 148 | 147
Legacy Sequoia | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 753 | 867
Legacy Sequoia | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,115 | 3,353
Legacy Sequoia | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 534 | 537
Legacy Sequoia | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 0
Legacy Sequoia | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 615,849 | 622,445
Sequoia Choice |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,017,683 | 622,590
Liabilities | $ 929,683 | $ 544,175
Number of VIEs (in investments) | Investment | 3 | 2
Sequoia Choice | Residential loans held-for-investment, at Redwood |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,013,619 | $ 620,062
Sequoia Choice | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 7 | 4
Sequoia Choice | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,057 | 2,524
Sequoia Choice | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Sequoia Choice | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 3,438 | 2,031
Sequoia Choice | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 7 | 4
Sequoia Choice | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 926,238 | $ 542,140

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