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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Jun. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Equity Method Investments [Line Items] |  |  |
Total damages including punitive | $ 70,000 |  |
Damages sought by plaintiff | $ 700,000 |  |
Unfunded loan commitments |  | $ 1,095,598 | $ 435,627
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unfunded loan commitments |  | $ 1,100,000 |

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