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Repurchase Agreements - Unencumbered Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Unencumbered Securities | $ 535,827 | $ 262,493
Agency RMBS |  |
Schedule of Investments [Line Items] |  |
Unencumbered Securities | 83,351 | 59,372
CMBS |  |
Schedule of Investments [Line Items] |  |
Unencumbered Securities | 235,199 | 107,040
Non-Agency RMBS |  |
Schedule of Investments [Line Items] |  |
Unencumbered Securities | 168,063 | 96,081
ABS |  |
Schedule of Investments [Line Items] |  |
Unencumbered Securities | $ 49,214 | $ 0

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