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Investment in Securities (Summary of Investment in Securities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,466,617 $ 1,993,242
Unamortized Premium (Discount) (164,198) (143,262)
Amortized Cost 1,399,411 1,975,520
Gross Unrealized Gains 30,549 36,882
Gross Unrealized Losses (179,698) (45,567)
Investment Owned At Fair Value, Net 1,250,262 1,966,835
Securities, at fair value(1)(2) [1],[2] 1,459,465 2,087,360
Securities sold short, at fair value $ (209,203) $ (120,525)
Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.58% 3.52%
Weighted Average Yield 4.41% 3.24%
Weighted average life 6 years 8 months 1 day 5 years 11 months 8 days
Long    
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,692,787 $ 2,115,078
Unamortized Premium (Discount) (168,822) (144,853)
Amortized Cost 1,620,957 2,095,765
Gross Unrealized Gains 17,475 36,320
Gross Unrealized Losses (178,967) (44,725)
Securities, at fair value(1)(2) $ 1,459,465 $ 2,087,360
Long | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.59% 3.37%
Weighted Average Yield 4.70% 3.37%
Weighted average life 6 years 11 months 4 days 5 years 10 months 24 days
Long | 15-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 140,409 $ 223,140
Unamortized Premium (Discount) 4,613 10,668
Amortized Cost 145,022 233,808
Gross Unrealized Gains 0 696
Gross Unrealized Losses (14,892) (1,953)
Securities, at fair value(1)(2) $ 130,130 $ 232,551
Long | 15-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.59% 2.65%
Weighted Average Yield 1.73% 1.44%
Weighted average life 4 years 3 months 18 days 4 years 5 months 12 days
Long | 20-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 7,253 $ 46,353
Unamortized Premium (Discount) 380 2,800
Amortized Cost 7,633 49,153
Gross Unrealized Gains 0 16
Gross Unrealized Losses (1,301) (1,280)
Securities, at fair value(1)(2) $ 6,332 $ 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 1.57% 1.31%
Weighted average life 6 years 11 months 12 days 5 years 7 months 13 days
Long | 30-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 846,582 $ 1,265,499
Unamortized Premium (Discount) 20,961 59,047
Amortized Cost 867,543 1,324,546
Gross Unrealized Gains 228 8,187
Gross Unrealized Losses (89,105) (12,311)
Securities, at fair value(1)(2) $ 778,666 $ 1,320,422
Long | 30-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.54% 3.01%
Weighted Average Yield 3.12% 2.13%
Weighted average life 8 years 6 months 25 days 7 years
Long | Adjustable rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 6,410 $ 9,131
Unamortized Premium (Discount) 581 566
Amortized Cost 6,991 9,697
Gross Unrealized Gains 0 25
Gross Unrealized Losses (737) (266)
Securities, at fair value(1)(2) $ 6,254 $ 9,456
Long | Adjustable rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.41% 3.15%
Weighted Average Yield 2.20% 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 $ 29,658 $ 50,601
Unamortized Premium (Discount) 3,511 3,215
Amortized Cost 33,169 53,816
Gross Unrealized Gains 0 300
Gross Unrealized Losses (3,180) (1,106)
Securities, at fair value(1)(2) $ 29,989 $ 53,010
Long | Reverse mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.50% 3.06%
Weighted Average Yield 2.60% 2.21%
Weighted average life 4 years 10 months 2 days 4 years 2 months 1 day
Long | Interest only securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 17,365 $ 32,607
Gross Unrealized Gains 1,179 3,371
Gross Unrealized Losses (1,652) (2,690)
Securities, at fair value(1)(2) $ 16,892 $ 33,288
Long | Interest only securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.36% 3.46%
Weighted Average Yield 10.11% 8.91%
Weighted average life 5 years 3 months 25 days 4 years 3 months 29 days
Long | Non-Agency RMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 388,304 $ 326,762
Unamortized Premium (Discount) (130,167) (130,015)
Amortized Cost 258,137 196,747
Gross Unrealized Gains 5,228 10,276
Gross Unrealized Losses (24,475) (5,418)
Securities, at fair value(1)(2) $ 238,890 $ 201,605
Long | Non-Agency RMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.33% 4.17%
Weighted Average Yield 7.29% 6.15%
Weighted average life 5 years 8 months 26 days 3 years 11 months 26 days
Long | CMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 38,996 $ 46,873
Unamortized Premium (Discount) (17,722) (23,570)
Amortized Cost 21,274 23,303
Gross Unrealized Gains 287 469
Gross Unrealized Losses (6,992) (892)
Securities, at fair value(1)(2) $ 14,569 $ 22,880
Long | CMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.54% 2.84%
Weighted Average Yield 8.43% 7.00%
Weighted average life 8 years 3 months 29 days 7 years 10 months 6 days
Long | Non-Agency IOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 24,588 $ 16,701
Gross Unrealized Gains 3,566 1,405
Gross Unrealized Losses (1,182) (394)
Securities, at fair value(1)(2) $ 26,972 $ 17,712
Long | Non-Agency IOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.18% 0.64%
Weighted Average Yield 14.21% 14.71%
Weighted average life 7 years 7 months 24 days 5 years 5 months 4 days
Long | CLOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 45,240 $ 70,444
Gross Unrealized Gains 3,217 5,919
Gross Unrealized Losses (17,396) (14,034)
Securities, at fair value(1)(2) $ 31,061 $ 62,329
Long | CLOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.16% 3.59%
Weighted Average Yield 9.37% 8.94%
Weighted average life 3 years 21 days 3 years 1 month 9 days
Long | Asset-backed securities, backed by consumer loans    
Securities, Available-for-sale [Line Items]    
Current Principal $ 115,604 $ 118,154
Unamortized Premium (Discount) (28,282) (43,139)
Amortized Cost 87,322 75,015
Gross Unrealized Gains 278 1,242
Gross Unrealized Losses (13,956) (3,149)
Securities, at fair value(1)(2) $ 73,644 $ 73,108
Long | Asset-backed securities, backed by consumer loans | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 11.87% 11.65%
Weighted Average Yield 13.42% 14.80%
Weighted average life 1 year 2 months 15 days 1 year 3 months 18 days
Long | Corporate debt securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ 30,872 $ 28,565
Unamortized Premium (Discount) (23,337) (24,425)
Amortized Cost 7,535 4,140
Gross Unrealized Gains 551 1,723
Gross Unrealized Losses (553) (309)
Securities, at fair value(1)(2) $ 7,533 $ 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 2 years 1 month 28 days 1 year 11 months 15 days
Long | Corporate equity securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 9,799 $ 5,788
Gross Unrealized Gains 2,941 2,691
Gross Unrealized Losses (1,629) (923)
Securities, at fair value(1)(2) 11,111 7,556
Long | U.S. Treasury securities    
Securities, Available-for-sale [Line Items]    
Current Principal 88,699  
Unamortized Premium (Discount) 640  
Amortized Cost 89,339  
Gross Unrealized Gains 0  
Gross Unrealized Losses (1,917)  
Securities, at fair value(1)(2) $ 87,422  
Long | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.58%  
Weighted Average Yield 3.46%  
Weighted average life 7 years 21 days  
Short    
Securities, Available-for-sale [Line Items]    
Current Principal $ (226,170) (121,836)
Unamortized Premium (Discount) 4,624 1,591
Investment Sold, Not yet Purchased, Sale Proceeds (221,546) (120,245)
Gross Unrealized Gains 13,074 562
Gross Unrealized Losses (731) (842)
Securities sold short, at fair value $ (209,203) $ (120,525)
Short | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.94% 0.87%
Weighted Average Yield 2.29% 1.02%
Weighted average life 4 years 9 months 25 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 $ (200,850)  
Unamortized Premium (Discount) 6,132  
Investment Sold, Not yet Purchased, Sale Proceeds (194,718)  
Gross Unrealized Gains 10,025  
Gross Unrealized Losses (731)  
Securities sold short, at fair value $ (185,424)  
Short | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.18%  
Weighted Average Yield 2.60%  
Weighted average life 5 years 1 month 28 days  
Short | European sovereign bonds    
Securities, Available-for-sale [Line Items]    
Current Principal $ (25,320) $ (28,086)
Unamortized Premium (Discount) (1,508) 170
Investment Sold, Not yet Purchased, Sale Proceeds (26,828) (27,916)
Gross Unrealized Gains 3,049 156
Gross Unrealized Losses 0 (575)
Securities sold short, at fair value $ (23,779) $ (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 2 months 1 day 3 years 2 months 4 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.
[2] Includes assets pledged as collateral to counterparties. See Note 13 for additional details on the Company's borrowings and related collateral.