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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, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 750,694 | $ 798,317
Liabilities | 728,923 | 773,980
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 750,694 | 798,317
Liabilities | $ 728,923 | $ 773,980
Number of VIEs (in investments) | Investment | 20 | 20
Sequoia | Residential loans held-for-investment at Redwood |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 745,621 | $ 791,636
Sequoia | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 148 | 148
Sequoia | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 972 | 1,000
Sequoia | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,953 | 5,533
Sequoia | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 532 | 518
Sequoia | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 728,391 | $ 773,462

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