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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, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 847,399 | $ 1,195,574
Liabilities | 820,391 | $ 1,050,861
Number of VIEs | Investment |  | 22
Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | 847,399 | $ 1,028,124
Liabilities | $ 820,391 | $ 997,475
Number of VIEs | Investment | 20 | 21
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | $ 167,450
Liabilities |  | $ 53,386
Number of VIEs | Investment |  | 1
Residential loans held-for-investment at Redwood |  |
Variable Interest Entity [Line Items] |  |
Assets |  | $ 1,021,870
Residential loans held-for-investment at Redwood | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 839,976 | 1,021,870
Residential loans held-for-investment at Redwood | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Commercial loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 166,016
Commercial loans, held-for-investment | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Commercial loans, held-for-investment | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 166,016
Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 365
Restricted cash | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | 148 | 228
Restricted cash | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 137
Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 2,428
Accrued interest receivable | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,030 | 1,131
Accrued interest receivable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 1,297
Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 4,895
Other assets | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | 6,245 | 4,895
Other assets | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 804
Accrued interest payable | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 523 | 555
Accrued interest payable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 249
Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 100
Accrued expenses and other liabilities | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 100
Accrued expenses and other liabilities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 0
Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 1,049,957
Asset-backed securities issued | Sequoia Entities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 819,868 | 996,820
Asset-backed securities issued | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | $ 53,137

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