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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Unfunded loan commitments | $ 435,627 | $ 170,365
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Unfunded loan commitments | $ 435,627 |

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- Definition Mortgage Loans on Real Estate, Commitment to Lend, Unfunded Amount + References No definition available. + Details
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |