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Investment in Securities (Maturities of Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) [1],[2] $ 1,518,377 $ 1,459,465
Debt Securities, Available-for-Sale, Amortized Cost $ 1,445,337 $ 1,399,411
Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.78% 4.46%
Long    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 1,518,377 $ 1,459,465
Debt Securities, Available-for-Sale, Amortized Cost $ 1,602,641 $ 1,620,957
Long | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.95% 4.12%
Long | Agency RMBS    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 840,512 $ 951,371
Debt Securities, Available-for-Sale, Amortized Cost $ 883,044 $ 1,060,358
Long | Agency RMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.99% 3.40%
Long | Agency RMBS | Less than three years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 89,649 $ 20,547
Debt Securities, Available-for-Sale, Amortized Cost $ 89,955 $ 21,976
Long | Agency RMBS | Less than three years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.39% 3.57%
Long | Agency RMBS | Greater than three years less than seven years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 346,074 $ 242,472
Debt Securities, Available-for-Sale, Amortized Cost $ 360,574 $ 267,229
Long | Agency RMBS | Greater than three years less than seven years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.49% 3.46%
Long | Agency RMBS | Greater than seven years less than eleven [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 404,789 $ 685,742
Debt Securities, Available-for-Sale, Amortized Cost $ 432,515 $ 768,041
Long | Agency RMBS | Greater than seven years less than eleven [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.30% 3.38%
Long | Agency RMBS | Greater than eleven year [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 0 $ 2,610
Debt Securities, Available-for-Sale, Amortized Cost $ 0 $ 3,112
Long | Agency RMBS | Greater than eleven year [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.00% 2.72%
Long | Agency RMBS | Interest only securities    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 12,712 $ 16,892
Debt Securities, Available-for-Sale, Amortized Cost $ 11,891 $ 17,365
Long | Agency RMBS | Interest only securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.08% 1.36%
Long | Agency RMBS | Interest only securities | Less than three years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 1,541 $ 2,202
Debt Securities, Available-for-Sale, Amortized Cost $ 1,546 $ 2,501
Long | Agency RMBS | Interest only securities | Less than three years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.57% 0.90%
Long | Agency RMBS | Interest only securities | Greater than three years less than seven years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 8,227 $ 11,081
Debt Securities, Available-for-Sale, Amortized Cost $ 7,601 $ 11,343
Long | Agency RMBS | Interest only securities | Greater than three years less than seven years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.77% 1.58%
Long | Agency RMBS | Interest only securities | Greater than seven years less than eleven [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 2,676 $ 3,345
Debt Securities, Available-for-Sale, Amortized Cost $ 2,448 $ 3,207
Long | Agency RMBS | Interest only securities | Greater than seven years less than eleven [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.84% 1.94%
Long | Agency RMBS | Interest only securities | Greater than eleven year [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 268 $ 264
Debt Securities, Available-for-Sale, Amortized Cost $ 296 $ 314
Long | Agency RMBS | Interest only securities | Greater than eleven year [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.68% 0.68%
Long | Non-Agency RMBS and CMBS    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 312,245 $ 253,459
Debt Securities, Available-for-Sale, Amortized Cost $ 341,979 $ 279,411
Long | Non-Agency RMBS and CMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.04% 4.17%
Long | Non-Agency RMBS and CMBS | Less than three years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 116,076 $ 81,122
Debt Securities, Available-for-Sale, Amortized Cost $ 117,707 $ 84,695
Long | Non-Agency RMBS and CMBS | Less than three years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.41% 3.66%
Long | Non-Agency RMBS and CMBS | Greater than three years less than seven years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 131,314 $ 109,722
Debt Securities, Available-for-Sale, Amortized Cost $ 135,591 $ 115,716
Long | Non-Agency RMBS and CMBS | Greater than three years less than seven years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 7.05% 5.41%
Long | Non-Agency RMBS and CMBS | Greater than seven years less than eleven [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 58,741 $ 36,179
Debt Securities, Available-for-Sale, Amortized Cost $ 74,401 $ 44,611
Long | Non-Agency RMBS and CMBS | Greater than seven years less than eleven [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.04% 3.05%
Long | Non-Agency RMBS and CMBS | Greater than eleven year [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 6,114 $ 26,436
Debt Securities, Available-for-Sale, Amortized Cost $ 14,280 $ 34,389
Long | Non-Agency RMBS and CMBS | Greater than eleven year [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.38% 3.53%
Long | Non-Agency RMBS    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 269,474 $ 238,890
Debt Securities, Available-for-Sale, Amortized Cost $ 287,777 $ 258,137
Long | Non-Agency RMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.07% 4.33%
Long | Non-Agency RMBS | Interest only securities    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 38,776 $ 26,972
Debt Securities, Available-for-Sale, Amortized Cost $ 35,214 $ 24,588
Long | Non-Agency RMBS | Interest only securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.17% 0.18%
Long | Non-Agency RMBS | Interest only securities | Less than three years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 3,885 $ 4,347
Debt Securities, Available-for-Sale, Amortized Cost $ 4,535 $ 3,913
Long | Non-Agency RMBS | Interest only securities | Less than three years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.10% 0.15%
Long | Non-Agency RMBS | Interest only securities | Greater than three years less than seven years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 11,014 $ 3,723
Debt Securities, Available-for-Sale, Amortized Cost $ 11,343 $ 4,247
Long | Non-Agency RMBS | Interest only securities | Greater than three years less than seven years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.28% 1.47%
Long | Non-Agency RMBS | Interest only securities | Greater than seven years less than eleven [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 23,555 $ 18,902
Debt Securities, Available-for-Sale, Amortized Cost $ 19,072 $ 16,428
Long | Non-Agency RMBS | Interest only securities | Greater than seven years less than eleven [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.15% 0.16%
Long | Non-Agency RMBS | Interest only securities | Greater than eleven year [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 322 $ 0
Debt Securities, Available-for-Sale, Amortized Cost $ 264 $ 0
Long | Non-Agency RMBS | Interest only securities | Greater than eleven year [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.25% 0.00%
Long | CLOs And Other Securities [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 293,004 $ 199,660
Debt Securities, Available-for-Sale, Amortized Cost $ 307,447 $ 229,436
Long | CLOs And Other Securities [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.40% 4.91%
Long | CLOs And Other Securities [Member] | Less than three years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 99,770 $ 96,371
Debt Securities, Available-for-Sale, Amortized Cost $ 114,709 $ 120,086
Long | CLOs And Other Securities [Member] | Less than three years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 6.02% 5.42%
Long | CLOs And Other Securities [Member] | Greater than three years less than seven years [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 106,529 $ 53,804
Debt Securities, Available-for-Sale, Amortized Cost $ 107,727 $ 59,754
Long | CLOs And Other Securities [Member] | Greater than three years less than seven years [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 5.13% 3.69%
Long | CLOs And Other Securities [Member] | Greater than seven years less than eleven [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 86,705 $ 49,485
Debt Securities, Available-for-Sale, Amortized Cost $ 85,011 $ 49,596
Long | CLOs And Other Securities [Member] | Greater than seven years less than eleven [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.12% 4.01%
Long | CLOs And Other Securities [Member] | Greater than eleven year [Member]    
Securities, Available-for-sale [Line Items]    
Securities, at fair value(1)(2) $ 0 $ 0
Debt Securities, Available-for-Sale, Amortized Cost $ 0 $ 0
Long | CLOs And Other Securities [Member] | Greater than eleven year [Member] | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.00% 0.00%
[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.
[2] Includes assets pledged as collateral to counterparties. See Note 14 for additional details on the Company's borrowings and related collateral.