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Variable Interest Entities - Additional Information - (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Held to maturity security | $ 8,557,000 |  | $ 8,487,000
Income from investment in CLO warehouse entities | 2,226,000 | $ 3,184,000 |
Collateralized Loan Obligation Funds |  |  |
Variable Interest Entity [Line Items] |  |  |
Held to maturity security | 8,557,000 |  | 8,487,000
Income from investment in CLO warehouse entities | 2,226,000 | 3,184,000 |
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 | $ 1,717,000 | $ 6,574,000 |

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