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Other Assets and Liabilities - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2018 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2018 USD ($) property | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) property | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other Assets and Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Mortgage servicing rights |  | $ 63,785 | $ 63,785 |  | $ 63,598 |  |  |
Security purchase deposit |  | 57,982 | 57,982 |  | 0 |  |  |
Investment receivable |  | 36,463 | 36,463 |  | 1,147 |  |  |
Real estate owned (REO) |  | $ 2,915 | 2,915 |  | $ 3,354 |  |  |
Amount related to transfers into REO |  |  | 2,000 |  |  |  |  |
REO liquidations |  |  | 3,000 |  |  |  |  |
Unrealized gain resulting from market valuation adjustments on REO |  |  | $ 300 |  |  |  |  |
Legacy Sequoia |  |  |  |  |  |  |  |
Other Assets and Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Number of REO properties recorded on balance sheet (in properties) | property |  | 10 | 10 |  | 14 |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |
Other Assets and Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Minority interest acquired | 20.00% |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 10,000 |  |  |  |  |  |  |
Option to purchase additional equity, option term | 1 year |  |  |  |  |  |  |
Option to purchase additional remaining equity | $ 40,000 |  |  |  |  |  |  |
Loan flow purchase agreement, agreement term | 1 year |  |  |  |  |  |  |
Equity Method Investments |  | $ 7,000 | $ 7,000 |  |  |  |  |
Cost method investment, purchase option |  | 4,000 | 4,000 |  |  |  |  |
Equity method investment earnings (losses), excluding intangible asset amortization |  | 200 |  |  |  |  |  |
Equity method investment earnings (losses) |  | 100 |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  |  |  |  |
Other Assets and Other Liabilities [Line Items] |  |  |  |  |  |  |  |
MSRs |  | 63,785 | 63,785 | $ 64,674 | $ 63,598 | $ 62,928 | $ 63,770 | $ 118,526
Mortgage servicing rights |  | 5,020,000 | 5,020,000 |  | $ 5,560,000 |  |  |
Real estate securities |  |  |  |  |  |  |  |
Other Assets and Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Investment receivable |  | $ 35,000 | $ 35,000 |  |  |  |  |

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