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(Schedule of Reverse Repurchase Agreements by Maturity) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
counterparty
Dec. 31, 2022
USD ($)
counterparty
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) [1] $ 2,967,437 $ 2,609,685
Number of Counterparties with Outstanding Reverse Repurchase Agreements | counterparty 26 26
Total secured borrowings $ 13,100,000 $ 12,200,000
Agency RMBS    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 1,095,341 939,653
Agency RMBS | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 1,076,710 668,924
Agency RMBS | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 15,786 91,048
Agency RMBS | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 914 158,782
Agency RMBS | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 0 4,751
Agency RMBS | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 1,931 0
Agency RMBS | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 0 16,148
U.S. Treasury securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 155,016 69,347
U.S. Treasury securities | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 155,016 69,347
Credit    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 1,566,852 1,600,685
Credit | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 124,617 462,284
Credit | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 136,434 119,619
Credit | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 82,992 119,471
Credit | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 290,215 358,010
Credit | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 5,980 6,981
Credit | Total Credit Assets    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 58,631 0
Credit | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 0 142,939
Credit | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 867,983 391,381
Reverse mortgage loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) 150,228 0
Reverse mortgage loans | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements(1) $ 150,228 $ 0
Minimum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 4.81% 0.63%
Repurchase agreements, remaining days to maturity 2 days 3 days
Maximum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 8.68% 7.97%
Repurchase agreements, remaining days to maturity 513 days 263 days
Weighted Average    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.67% 5.50%
Repurchase agreements, remaining days to maturity 126 days 78 days
Weighted Average | Agency RMBS    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 5.55% 3.91%
Repurchase agreements, remaining days to maturity 18 days 29 days
Weighted Average | Agency RMBS | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 5.55% 4.09%
Repurchase agreements, remaining days to maturity 17 days 14 days
Weighted Average | Agency RMBS | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 5.81% 2.32%
Repurchase agreements, remaining days to maturity 49 days 45 days
Weighted Average | Agency RMBS | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.16% 3.96%
Repurchase agreements, remaining days to maturity 72 days 73 days
Weighted Average | Agency RMBS | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.00% 5.20%
Repurchase agreements, remaining days to maturity 0 days 118 days
Weighted Average | Agency RMBS | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.23% 0.00%
Repurchase agreements, remaining days to maturity 159 days 0 days
Weighted Average | Agency RMBS | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.00% 4.76%
Repurchase agreements, remaining days to maturity 0 days 131 days
Weighted Average | U.S. Treasury securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 5.51% 4.31%
Repurchase agreements, remaining days to maturity 2 days 3 days
Weighted Average | U.S. Treasury securities | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 5.51% 4.31%
Repurchase agreements, remaining days to maturity 2 days 3 days
Weighted Average | Credit    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.44% 6.48%
Repurchase agreements, remaining days to maturity 199 days 110 days
Weighted Average | Credit | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.80% 6.40%
Repurchase agreements, remaining days to maturity 22 days 7 days
Weighted Average | Credit | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.03% 6.00%
Repurchase agreements, remaining days to maturity 41 days 48 days
Weighted Average | Credit | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.85% 6.13%
Repurchase agreements, remaining days to maturity 74 days 77 days
Weighted Average | Credit | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.36% 6.30%
Repurchase agreements, remaining days to maturity 116 days 116 days
Weighted Average | Credit | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 6.68% 6.72%
Repurchase agreements, remaining days to maturity 161 days 156 days
Weighted Average | Credit | Total Credit Assets    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 8.61% 0.00%
Repurchase agreements, remaining days to maturity 513 days 0 days
Weighted Average | Credit | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.00% 7.12%
Repurchase agreements, remaining days to maturity 0 days 144 days
Weighted Average | Credit | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.61% 6.74%
Repurchase agreements, remaining days to maturity 268 days 240 days
Weighted Average | Reverse mortgage loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.97% 0.00%
Repurchase agreements, remaining days to maturity 282 days 0 days
Weighted Average | Reverse mortgage loans | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 7.97% 0.00%
Repurchase agreements, remaining days to maturity 282 days 0 days
[1] Ellington Financial Inc.'s Consolidated Balance Sheets include assets and liabilities of variable interest entities it has consolidated. See Note 12 for additional details on Ellington Financial Inc.'s consolidated variable interest entities.