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Counterparty Risk (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Risks and Uncertainties [Abstract]    
Financial Instruments transferred as collateral for repurchase agreements $ 1,790,000 $ 2,013,000
Financial Instruments transferred as collateral for repurchase agreements, Unsettled $ 86,700 36,300
Concentration risk threshold 15.00%  
Unencumbered investments held in custody $ 13,300  
Cash and cash equivalents $ 44,656 $ 42,671 [1]
[1] Ellington Financial Inc.'s Condensed Consolidated Balance Sheet includes assets and liabilities of variable interest entities it has consolidated. See Note 9 for additional details on Ellington Financial Inc.'s consolidated variable interest entities.