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Variable Interest Entities - Additional Information - (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |  |  |
Held to maturity security |  |  |  | $ 8,403 | $ 8,557
Income from investment in CLO warehouse entities |  |  | $ 1,954 |  |
Collateralized Loan Obligation Funds |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Held to maturity security |  |  |  | 8,403 | 8,557
Income from investment in CLO warehouse entities | $ 0 |  | 1,954 |  |
Collateralized Loan Obligation Funds | Warehouse CLO Funds |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity investments |  |  |  | $ 0 | $ 0
Asset management fees |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Asset management fees |  | $ 1,717 | $ 1,717 |  |

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