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(Schedule of Reverse Repurchase Agreements by Maturity) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2022
USD ($)
counterparty
Dec. 31, 2021
USD ($)
counterparty
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements [1]   $ 2,609,685 $ 2,469,763
Number of Counterparties with Outstanding Reverse Repurchase Agreements | counterparty   26 23
Total secured borrowings   $ 12,200,000 $ 3,600,000
Agency RMBS      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   939,653 1,639,887
Agency RMBS | 30 Days or Less      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   668,924 180,059
Agency RMBS | 31-60 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   91,048 254,027
Agency RMBS | 61-90 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   158,782 154,520
Agency RMBS | 91-120 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   4,751 129,057
Agency RMBS | 151 to 180 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   0 71,824
Agency RMBS | Total Credit Assets      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   0 3,791
Agency RMBS | 121-150 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   16,148 275,915
Agency RMBS | More Than 360 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   0 570,694
U.S. Treasury securities      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   69,347 0
U.S. Treasury securities | 30 Days or Less      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   69,347 0
Credit      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   1,600,685 829,876
Credit | 30 Days or Less      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   462,284 377,440
Credit | 31-60 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   119,619 102,567
Credit | 61-90 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   119,471 96,823
Credit | 91-120 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   358,010 35,346
Credit | 151 to 180 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   6,981 87,863
Credit | Total Credit Assets      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   0 126,484
Credit | 121-150 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   142,939 3,353
Credit | More Than 360 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements   $ 391,381 $ 0
Minimum      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   0.63% 0.10%
Repurchase agreements, remaining days to maturity 3 days 3 days  
Maximum      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   7.97% 3.75%
Repurchase agreements, remaining days to maturity 638 days 263 days  
Weighted Average      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   5.50% 0.82%
Repurchase agreements, remaining days to maturity 134 days 78 days  
Weighted Average | Agency RMBS      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   3.91% 0.19%
Repurchase agreements, remaining days to maturity 144 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   4.09% 0.17%
Repurchase agreements, remaining days to maturity 9 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   2.32% 0.23%
Repurchase agreements, remaining days to maturity 44 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   3.96% 0.20%
Repurchase agreements, remaining days to maturity 70 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   5.20% 0.16%
Repurchase agreements, remaining days to maturity 105 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   0.00% 0.16%
Repurchase agreements, remaining days to maturity 164 days 0 days  
Weighted Average | Agency RMBS | Total Credit Assets      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   0.00% 0.13%
Repurchase agreements, remaining days to maturity 366 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   4.76% 0.17%
Repurchase agreements, remaining days to maturity 136 days 131 days  
Weighted Average | Agency RMBS | More Than 360 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   0.00% 0.20%
Repurchase agreements, remaining days to maturity 260 days 0 days  
Weighted Average | U.S. Treasury securities      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   4.31% 0.00%
Repurchase agreements, remaining days to maturity 0 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   4.31% 0.00%
Repurchase agreements, remaining days to maturity 0 days 3 days  
Weighted Average | Non-Agency RMBS | Total Credit Assets      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements, remaining days to maturity   0 days  
Weighted Average | Non-Agency RMBS | More Than 360 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreements, remaining days to maturity 0 days    
Weighted Average | Credit      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   6.48% 2.08%
Repurchase agreements, remaining days to maturity 114 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   6.40% 2.09%
Repurchase agreements, remaining days to maturity 16 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   6.00% 1.38%
Repurchase agreements, remaining days to maturity 44 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   6.13% 1.50%
Repurchase agreements, remaining days to maturity 78 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   6.30% 2.00%
Repurchase agreements, remaining days to maturity 109 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   6.72% 2.82%
Repurchase agreements, remaining days to maturity 151 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   0.00% 2.58%
Repurchase agreements, remaining days to maturity 462 days    
Weighted Average | Credit | 121-150 Days      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase Agreements Interest Rate   7.12% 1.56%
Repurchase agreements, remaining days to maturity 139 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   6.74% 0.00%
Repurchase agreements, remaining days to maturity   240 days  
[1] Ellington Financial Inc.'s Consolidated Balance Sheets include assets and liabilities of variable interest entities it has consolidated. See Note 11 for additional details on Ellington Financial Inc.'s consolidated variable interest entities.