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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 1,259,774 | $ 798,317
Liabilities | 1,167,157 | 773,980
Legacy Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 637,184 | 798,317
Liabilities | $ 622,982 | $ 773,980
Number of VIEs | Investment | 20 | 20
Legacy Sequoia | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 632,817 | $ 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 | 867 | 1,000
Legacy Sequoia | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,353 | 5,533
Legacy Sequoia | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 537 | 518
Legacy Sequoia | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 |
Legacy Sequoia | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 622,445 | 773,462
Sequoia Choice |  |
Variable Interest Entity [Line Items] |  |
Assets | 622,590 | 0
Liabilities | $ 544,175 | $ 0
Number of VIEs | Investment | 2 | 0
Sequoia Choice | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 620,062 | $ 0
Sequoia Choice | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 4 | 0
Sequoia Choice | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,524 | 0
Sequoia Choice | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Sequoia Choice | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 2,031 | 0
Sequoia Choice | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 4 |
Sequoia Choice | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 542,140 | 0
Total Consolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,259,774 | 798,317
Liabilities | $ 1,167,157 | $ 773,980
Number of VIEs | Investment | 22 | 20
Total Consolidated VIEs | Residential loans, held-for-investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,252,879 | $ 791,636
Total Consolidated VIEs | Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 151 | 148
Total Consolidated VIEs | Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,391 | 1,000
Total Consolidated VIEs | REO |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,353 | 5,533
Total Consolidated VIEs | Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 2,568 | 518
Total Consolidated VIEs | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 4 |
Total Consolidated VIEs | Asset-backed securities issued |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 1,164,585 | $ 773,462

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