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Repurchase Agreements - Unencumbered Investment Securities (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]  
Unencumbered securities $ 535,827
Agency RMBS  
Schedule of Investments [Line Items]  
Unencumbered securities 83,351
CMBS  
Schedule of Investments [Line Items]  
Unencumbered securities 235,199
Non-Agency RMBS  
Schedule of Investments [Line Items]  
Unencumbered securities 168,063
ABS  
Schedule of Investments [Line Items]  
Unencumbered securities $ 49,214