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Investment in Loans (Schedule of Residential Mortgage Loans) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 1,100,062  
Unamortized Premium (Discount) (127,647)  
Amortized Cost   $ 2,970,306
Fair Value [1] $ 1,091,523  
Weighted Average    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Coupon 4.21%  
Weighted Average Yield 4.47%  
Weighted average life 6 years 18 days  
Residential mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 652,119  
Fair Value 663,880  
Loans held-for-investment [Member] | Residential mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 652,119  
Unamortized Premium (Discount) 5,258  
Amortized Cost 657,377  
Gains 7,681  
Losses (1,178)  
Fair Value $ 663,880  
Loans held-for-investment [Member] | Residential mortgage loans | Weighted Average    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Coupon 6.49%  
Weighted Average Yield 5.12%  
Weighted average life 5 years 175 days  
Non-QM loan securitization | Residential mortgage loans | Consolidated Entities [Member] | Securitized loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fair Value $ 503,090  
[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.