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Investment in Securities (Summary of Investment in Securities) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,562,334 $ 1,993,242
Unamortized Premium (Discount) (150,657) (143,262)
Amortized Cost 1,510,819 1,975,520
Gross Unrealized Gains 33,362 36,882
Gross Unrealized Losses (220,951) (45,567)
Investment Owned At Fair Value, Net 1,323,230 1,966,835
Securities, at fair value(1)(2) [1],[2] 1,522,772 2,087,360
Securities sold short, at fair value $ (199,542) $ (120,525)
Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.66% 3.52%
Weighted Average Yield 4.05% 3.24%
Weighted average life 7 years 1 month 2 days 5 years 11 months 8 days
Long    
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,778,662 $ 2,115,078
Unamortized Premium (Discount) (152,013) (144,853)
Amortized Cost 1,725,791 2,095,765
Gross Unrealized Gains 17,749 36,320
Gross Unrealized Losses (220,768) (44,725)
Securities, at fair value(1)(2) $ 1,522,772 $ 2,087,360
Long | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.67% 3.37%
Weighted Average Yield 4.29% 3.37%
Weighted average life 7 years 4 months 17 days 5 years 10 months 24 days
Long | 15-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 156,524 $ 223,140
Unamortized Premium (Discount) 4,390 10,668
Amortized Cost 160,914 233,808
Gross Unrealized Gains 0 696
Gross Unrealized Losses (18,212) (1,953)
Securities, at fair value(1)(2) $ 142,702 $ 232,551
Long | 15-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.54% 2.65%
Weighted Average Yield 1.76% 1.44%
Weighted average life 4 years 5 months 12 days 4 years 5 months 12 days
Long | 20-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 7,382 $ 46,353
Unamortized Premium (Discount) 393 2,800
Amortized Cost 7,775 49,153
Gross Unrealized Gains 0 16
Gross Unrealized Losses (1,488) (1,280)
Securities, at fair value(1)(2) $ 6,287 $ 47,889
Long | 20-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.41% 2.42%
Weighted Average Yield 1.56% 1.31%
Weighted average life 7 years 1 month 2 days 5 years 7 months 13 days
Long | 30-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,037,876 $ 1,265,499
Unamortized Premium (Discount) 22,495 59,047
Amortized Cost 1,060,371 1,324,546
Gross Unrealized Gains 0 8,187
Gross Unrealized Losses (130,864) (12,311)
Securities, at fair value(1)(2) $ 929,507 $ 1,320,422
Long | 30-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.32% 3.01%
Weighted Average Yield 2.91% 2.13%
Weighted average life 8 years 11 months 4 days 7 years
Long | Adjustable rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 6,672 $ 9,131
Unamortized Premium (Discount) 584 566
Amortized Cost 7,256 9,697
Gross Unrealized Gains 0 25
Gross Unrealized Losses (758) (266)
Securities, at fair value(1)(2) $ 6,498 $ 9,456
Long | Adjustable rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.41% 3.15%
Weighted Average Yield 2.29% 2.12%
Weighted average life 4 years 9 months 14 days 4 years 7 months 13 days
Long | Reverse mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 30,502 $ 50,601
Unamortized Premium (Discount) 3,189 3,215
Amortized Cost 33,691 53,816
Gross Unrealized Gains 0 300
Gross Unrealized Losses (2,895) (1,106)
Securities, at fair value(1)(2) $ 30,796 $ 53,010
Long | Reverse mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.47% 3.06%
Weighted Average Yield 2.39% 2.21%
Weighted average life 4 years 8 months 1 day 4 years 2 months 1 day
Long | Interest only securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 20,101 $ 32,607
Gross Unrealized Gains 1,510 3,371
Gross Unrealized Losses (2,086) (2,690)
Securities, at fair value(1)(2) $ 19,525 $ 33,288
Long | Interest only securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.53% 3.46%
Weighted Average Yield 9.63% 8.91%
Weighted average life 5 years 6 months 14 days 4 years 3 months 29 days
Long | Non-Agency RMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 331,522 $ 326,762
Unamortized Premium (Discount) (117,925) (130,015)
Amortized Cost 213,597 196,747
Gross Unrealized Gains 5,021 10,276
Gross Unrealized Losses (25,319) (5,418)
Securities, at fair value(1)(2) $ 193,299 $ 201,605
Long | Non-Agency RMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.85% 4.17%
Weighted Average Yield 7.28% 6.15%
Weighted average life 6 years 2 months 12 days 3 years 11 months 26 days
Long | CMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 38,996 $ 46,873
Unamortized Premium (Discount) (17,920) (23,570)
Amortized Cost 21,076 23,303
Gross Unrealized Gains 388 469
Gross Unrealized Losses (5,787) (892)
Securities, at fair value(1)(2) $ 15,677 $ 22,880
Long | CMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.60% 2.84%
Weighted Average Yield 8.45% 7.00%
Weighted average life 8 years 1 month 28 days 7 years 10 months 6 days
Long | Non-Agency IOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 23,450 $ 16,701
Gross Unrealized Gains 4,471 1,405
Gross Unrealized Losses (797) (394)
Securities, at fair value(1)(2) $ 27,124 $ 17,712
Long | Non-Agency IOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.20% 0.64%
Weighted Average Yield 14.84% 14.71%
Weighted average life 8 years 4 months 28 days 5 years 5 months 4 days
Long | CLOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 45,013 $ 70,444
Gross Unrealized Gains 2,999 5,919
Gross Unrealized Losses (17,477) (14,034)
Securities, at fair value(1)(2) $ 30,535 $ 62,329
Long | CLOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.87% 3.59%
Weighted Average Yield 8.69% 8.94%
Weighted average life 3 years 6 months 14 days 3 years 1 month 9 days
Long | Asset-backed securities, backed by consumer loans    
Securities, Available-for-sale [Line Items]    
Current Principal $ 111,727 $ 118,154
Unamortized Premium (Discount) (26,001) (43,139)
Amortized Cost 85,726 75,015
Gross Unrealized Gains 432 1,242
Gross Unrealized Losses (10,590) (3,149)
Securities, at fair value(1)(2) $ 75,568 $ 73,108
Long | Asset-backed securities, backed by consumer loans | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 12.00% 11.65%
Weighted Average Yield 12.93% 14.80%
Weighted average life 1 year 2 months 4 days 1 year 3 months 18 days
Long | Corporate debt securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ 25,161 $ 28,565
Unamortized Premium (Discount) (21,244) (24,425)
Amortized Cost 3,917 4,140
Gross Unrealized Gains 88 1,723
Gross Unrealized Losses (403) (309)
Securities, at fair value(1)(2) $ 3,602 $ 5,554
Long | Corporate debt securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.00% 0.65%
Weighted Average Yield 0.00% 7.50%
Weighted average life 1 year 1 month 6 days 1 year 11 months 15 days
Long | Corporate equity securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 10,578 $ 5,788
Gross Unrealized Gains 2,840 2,691
Gross Unrealized Losses (2,249) (923)
Securities, at fair value(1)(2) 11,169 7,556
Long | U.S. Treasury securities    
Securities, Available-for-sale [Line Items]    
Current Principal 32,300  
Unamortized Premium (Discount) 26  
Amortized Cost 32,326  
Gross Unrealized Gains 0  
Gross Unrealized Losses (1,843)  
Securities, at fair value(1)(2) $ 30,483  
Long | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.89%  
Weighted Average Yield 2.85%  
Weighted average life 5 years 3 months 29 days  
Short    
Securities, Available-for-sale [Line Items]    
Current Principal $ (216,328) (121,836)
Unamortized Premium (Discount) 1,356 1,591
Investment Sold, Not yet Purchased, Sale Proceeds (214,972) (120,245)
Gross Unrealized Gains 15,613 562
Gross Unrealized Losses (183) (842)
Securities sold short, at fair value $ (199,542) $ (120,525)
Short | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.93% 0.87%
Weighted Average Yield 2.21% 1.02%
Weighted average life 4 years 11 months 4 days 6 years 8 months 23 days
Short | Corporate debt securities    
Securities, Available-for-sale [Line Items]    
Current Principal   $ (93,750)
Unamortized Premium (Discount)   1,421
Investment Sold, Not yet Purchased, Sale Proceeds   (92,329)
Gross Unrealized Gains   406
Gross Unrealized Losses   (267)
Securities sold short, at fair value   $ (92,190)
Short | Corporate debt securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon   1.13%
Weighted Average Yield   1.31%
Weighted average life   7 years 9 months 21 days
Short | U.S. Treasury securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ (193,100)  
Unamortized Premium (Discount) 4,956  
Investment Sold, Not yet Purchased, Sale Proceeds (188,144)  
Gross Unrealized Gains 10,723  
Gross Unrealized Losses (183)  
Securities sold short, at fair value $ (177,604)  
Short | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.16%  
Weighted Average Yield 2.51%  
Weighted average life 5 years 2 months 26 days  
Short | European sovereign bonds    
Securities, Available-for-sale [Line Items]    
Current Principal $ (23,228) $ (28,086)
Unamortized Premium (Discount) (3,600) 170
Investment Sold, Not yet Purchased, Sale Proceeds (26,828) (27,916)
Gross Unrealized Gains 4,890 156
Gross Unrealized Losses 0 (575)
Securities sold short, at fair value $ (21,938) $ (28,335)
Short | European sovereign bonds | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.01% 0.01%
Weighted Average Yield 0.04% 0.05%
Weighted average life 2 years 5 months 4 days 3 years 2 months 4 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.
[2] Includes assets pledged as collateral to counterparties. See Note 11 for additional details on the Company's borrowings and related collateral.