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(Schedule of Reverse Repurchase Agreements by Maturity) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
counterparty
Dec. 31, 2021
USD ($)
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements [1] $ 2,717,638 $ 2,469,763
Number of Counterparties with Outstanding Reverse Repurchase Agreements | counterparty 23  
Total secured borrowings $ 4,000,000 3,600,000
Agency RMBS    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,498,106 1,639,887
Agency RMBS | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 202,858 180,059
Agency RMBS | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 375,075 254,027
Agency RMBS | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 217,310 154,520
Agency RMBS | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 50,194 129,057
Agency RMBS | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 153,828 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 243,732 275,915
Agency RMBS | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 255,109 570,694
Credit    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,219,532 829,876
Credit | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 9,228 377,440
Credit | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 82,719 102,567
Credit | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 251,658 96,823
Credit | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 404,311 35,346
Credit | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 5,392 87,863
Credit | Total Credit Assets    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 226,893 126,484
Credit | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 3,353
Credit | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 239,331 $ 0
Minimum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.14% 0.10%
Repurchase agreements, remaining days to maturity 1 day 3 days
Maximum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 4.22% 3.75%
Repurchase agreements, remaining days to maturity 548 days 638 days
Weighted Average    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 1.22% 0.82%
Repurchase agreements, remaining days to maturity 151 days 134 days
Weighted Average | Agency RMBS    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.31% 0.19%
Repurchase agreements, remaining days to maturity 107 days 144 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 0.20% 0.17%
Repurchase agreements, remaining days to maturity 14 days 9 days
Weighted Average | Agency RMBS | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.24% 0.23%
Repurchase agreements, remaining days to maturity 46 days 44 days
Weighted Average | Agency RMBS | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.36% 0.20%
Repurchase agreements, remaining days to maturity 73 days 70 days
Weighted Average | Agency RMBS | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.24% 0.16%
Repurchase agreements, remaining days to maturity 104 days 105 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 0.37% 0.16%
Repurchase agreements, remaining days to maturity 166 days 164 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 0 days 366 days
Weighted Average | Agency RMBS | 121-150 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 0.30% 0.17%
Repurchase agreements, remaining days to maturity 135 days 136 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 0.44% 0.20%
Repurchase agreements, remaining days to maturity 236 days 260 days
Weighted Average | Non-Agency RMBS | 121-150 Days    
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 2.33% 2.08%
Repurchase agreements, remaining days to maturity 206 days 114 days
Weighted Average | Credit | 30 Days or Less    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 1.37% 2.09%
Repurchase agreements, remaining days to maturity 17 days 16 days
Weighted Average | Credit | 31-60 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 1.76% 1.38%
Repurchase agreements, remaining days to maturity 45 days 44 days
Weighted Average | Credit | 61-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 2.48% 1.50%
Repurchase agreements, remaining days to maturity 69 days 78 days
Weighted Average | Credit | 91-120 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 2.17% 2.00%
Repurchase agreements, remaining days to maturity 116 days 109 days
Weighted Average | Credit | 151 to 180 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 3.75% 2.82%
Repurchase agreements, remaining days to maturity 168 days 151 days
Weighted Average | Credit | Total Credit Assets    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 2.54% 2.58%
Repurchase agreements, remaining days to maturity 503 days 462 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% 1.56%
Repurchase agreements, remaining days to maturity   139 days
Weighted Average | Credit | More Than 360 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Interest Rate 2.45% 0.00%
Repurchase agreements, remaining days to maturity 282 days  
[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.