v3.26.1
(Schedule of Reverse Repurchase Agreements by Maturity) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Jun. 30, 2026
USD ($)
counterparty
Jun. 30, 2025
Dec. 31, 2025
USD ($)
counterparty
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1) [1]   $ 3,064,277   $ 2,655,444
Number of Counterparties with Outstanding Reverse Repurchase Agreements | counterparty   23   21
Total secured borrowings   $ 17,800,000   $ 16,300,000
Agency RMBS        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   110,005   193,105
Agency RMBS | 30 Days or Less        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   110,005   193,105
U.S. Treasury securities        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   139,584   33,310
U.S. Treasury securities | 30 Days or Less        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   139,584   33,310
Other        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   2,814,688   2,429,029
Other | 30 Days or Less        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   3,185   40,822
Other | 31-60 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   412,134   406,647
Other | 61-90 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   306,978   210,885
Other | 91-120 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   361,958   361,230
Other | 121-150 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   133,599   0
Other | 151 to 180 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   7,478   13,143
Other | 181 to 364 days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   502,381   217,900
Other | Greater than 364 days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase agreements(1)   $ 1,086,975   $ 1,178,402
Minimum        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   2.96%   2.79%
Repurchase agreements, remaining days to maturity   1 day 2 days  
Maximum        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   7.05%   7.05%
Repurchase agreements, remaining days to maturity   780 days 636 days  
Weighted Average        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.16%   5.18%
Repurchase agreements, remaining days to maturity 268 days 267 days    
Weighted Average | Agency RMBS        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   3.75%   4.00%
Repurchase agreements, remaining days to maturity 4 days 3 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   3.75%   4.00%
Repurchase agreements, remaining days to maturity 4 days 3 days    
Weighted Average | U.S. Treasury securities        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   3.73%   3.99%
Repurchase agreements, remaining days to maturity 2 days 1 day    
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   3.73%   3.99%
Repurchase agreements, remaining days to maturity 2 days 1 day    
Weighted Average | Other        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.28%   5.43%
Repurchase agreements, remaining days to maturity 304 days 290 days    
Weighted Average | Other | 30 Days or Less        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.03%   5.56%
Repurchase agreements, remaining days to maturity 17 days 17 days    
Weighted Average | Other | 31-60 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   4.49%   5.19%
Repurchase agreements, remaining days to maturity 46 days 47 days    
Weighted Average | Other | 61-90 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   4.47%   4.48%
Repurchase agreements, remaining days to maturity 75 days 77 days    
Weighted Average | Other | 91-120 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.20%   5.22%
Repurchase agreements, remaining days to maturity 115 days 117 days    
Weighted Average | Other | 121-150 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.73%   0.00%
Repurchase agreements, remaining days to maturity   126 days    
Weighted Average | Other | 151 to 180 Days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   4.33%   4.59%
Repurchase agreements, remaining days to maturity 161 days 163 days    
Weighted Average | Other | 181 to 364 days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.44%   5.86%
Repurchase agreements, remaining days to maturity 291 days 282 days    
Weighted Average | Other | Greater than 364 days        
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]        
Repurchase Agreements Interest Rate   5.72%   5.67%
Repurchase agreements, remaining days to maturity 505 days 526 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.