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Investment in Securities (Summary of Investment in Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,437,517 $ 2,282,149
Unamortized Premium (Discount) (174,092) (150,821)
Amortized Cost 1,537,690 2,342,369
Gross Unrealized Gains 43,657 43,801
Gross Unrealized Losses (113,243) (9,638)
Investment Owned At Fair Value, Net 1,468,104 2,376,532
Securities, at fair value(1) [1] 1,481,395 2,449,941
Securities sold short, at fair value $ (13,291) $ (73,409)
Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.13% 4.23%
Weighted Average Yield 4.96% 4.01%
Weighted average life 4 years 5 months 12 days 5 years 10 months 24 days
Long    
Securities, Available-for-sale [Line Items]    
Current Principal $ 1,450,751 $ 2,355,498
Unamortized Premium (Discount) (174,157) (151,329)
Amortized Cost 1,550,859 2,415,210
Gross Unrealized Gains 43,634 43,738
Gross Unrealized Losses (113,098) (9,007)
Securities, at fair value(1) $ 1,481,395 $ 2,449,941
Long | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.10% 4.15%
Weighted Average Yield 5.00% 4.09%
Weighted average life 4 years 5 months 15 days 5 years 10 months 17 days
Long | 15-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 74,791 $ 314,636
Unamortized Premium (Discount) 2,405 6,369
Amortized Cost 77,196 321,005
Gross Unrealized Gains 2,001 2,604
Gross Unrealized Losses (7) (203)
Securities, at fair value(1) $ 79,190 $ 323,406
Long | 15-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.55% 3.05%
Weighted Average Yield 2.47% 2.28%
Weighted average life 3 years 6 months 21 days 3 years 18 days
Long | 20-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 752 $ 804
Unamortized Premium (Discount) 46 49
Amortized Cost 798 853
Gross Unrealized Gains 30 24
Gross Unrealized Losses 0 0
Securities, at fair value(1) $ 828 $ 877
Long | 20-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.67% 4.62%
Weighted Average Yield 2.97% 2.99%
Weighted average life 3 years 11 months 15 days 4 years 9 months 18 days
Long | 30-year fixed-rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 699,907 $ 1,358,762
Unamortized Premium (Discount) 32,413 64,846
Amortized Cost 732,320 1,423,608
Gross Unrealized Gains 22,005 13,821
Gross Unrealized Losses (341) (2,830)
Securities, at fair value(1) $ 753,984 $ 1,434,599
Long | 30-year fixed-rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.17% 4.20%
Weighted Average Yield 2.89% 2.95%
Weighted average life 3 years 10 months 20 days 6 years 7 months 17 days
Long | Adjustable rate mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 8,645 $ 9,651
Unamortized Premium (Discount) 345 315
Amortized Cost 8,990 9,966
Gross Unrealized Gains 82 90
Gross Unrealized Losses (18) (54)
Securities, at fair value(1) $ 9,054 $ 10,002
Long | Adjustable rate mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.99% 3.99%
Weighted Average Yield 1.66% 2.03%
Weighted average life 3 years 29 days 4 years 1 month 2 days
Long | Reverse mortgages    
Securities, Available-for-sale [Line Items]    
Current Principal $ 122,183 $ 122,670
Unamortized Premium (Discount) 7,747 8,133
Amortized Cost 129,930 130,803
Gross Unrealized Gains 2,317 2,023
Gross Unrealized Losses (1,646) (26)
Securities, at fair value(1) $ 130,601 $ 132,800
Long | Reverse mortgages | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.23% 4.43%
Weighted Average Yield 2.80% 2.78%
Weighted average life 6 years 1 month 20 days 6 years 8 months 1 day
Long | Interest only securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 37,801 $ 34,044
Gross Unrealized Gains 5,442 1,624
Gross Unrealized Losses (899) (389)
Securities, at fair value(1) $ 42,344 $ 35,279
Long | Interest only securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.72% 2.81%
Weighted Average Yield 10.24% 9.27%
Weighted average life 3 years 6 months 10 days 3 years 10 months 9 days
Long | Non-Agency RMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 278,092 $ 274,353
Unamortized Premium (Discount) (112,903) (122,685)
Amortized Cost 165,189 151,668
Gross Unrealized Gains 9,344 12,549
Gross Unrealized Losses (15,301) (1,081)
Securities, at fair value(1) $ 159,232 $ 163,136
Long | Non-Agency RMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.01% 3.41%
Weighted Average Yield 6.02% 7.25%
Weighted average life 5 years 1 month 13 days 5 years 3 months 21 days
Long | CMBS    
Securities, Available-for-sale [Line Items]    
Current Principal $ 165,470 $ 185,417
Unamortized Premium (Discount) (60,960) (67,961)
Amortized Cost 104,510 117,456
Gross Unrealized Gains 0 2,990
Gross Unrealized Losses (32,728) (480)
Securities, at fair value(1) $ 71,782 $ 119,966
Long | CMBS | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.17% 3.31%
Weighted Average Yield 7.60% 6.62%
Weighted average life 8 years 11 months 15 days 8 years 11 months 8 days
Long | Non-Agency IOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 6,044 $ 6,517
Gross Unrealized Gains 1,776 1,817
Gross Unrealized Losses (316) (18)
Securities, at fair value(1) $ 7,504 $ 8,316
Long | Non-Agency IOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.98% 1.10%
Weighted Average Yield 21.18% 8.18%
Weighted average life 3 years 5 months 12 days 4 years 1 month 20 days
Long | CLOs    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 228,873 $ 169,238
Gross Unrealized Gains 156 4,219
Gross Unrealized Losses (59,756) (3,014)
Securities, at fair value(1) $ 169,273 $ 170,443
Long | CLOs | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 4.18% 5.05%
Weighted Average Yield 8.22% 9.62%
Weighted average life 4 years 9 months 10 days 4 years 9 months
Long | Asset-backed securities, backed by consumer loans    
Securities, Available-for-sale [Line Items]    
Current Principal $ 77,534 $ 67,080
Unamortized Premium (Discount) (22,007) (19,154)
Amortized Cost 55,527 47,926
Gross Unrealized Gains 193 1,596
Gross Unrealized Losses (1,093) (912)
Securities, at fair value(1) $ 54,627 $ 48,610
Long | Asset-backed securities, backed by consumer loans | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 11.68% 12.17%
Weighted Average Yield 15.13% 14.00%
Weighted average life 1 year 1 month 28 days 1 year 2 months 19 days
Long | Corporate debt securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ 21,953 $ 22,125
Unamortized Premium (Discount) (21,476) (21,241)
Amortized Cost 477 884
Gross Unrealized Gains 133 229
Gross Unrealized Losses 0 0
Securities, at fair value(1) $ 610 $ 1,113
Long | Corporate debt securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.00% 0.00%
Weighted Average Yield 0.00% 0.00%
Weighted average life 1 month 28 days 3 months 29 days
Long | Corporate equity securities    
Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,547 $ 1,242
Securities, at fair value(1) 712 1,394
Corporate equity, gross unrealized gains 155 152
Corporate equity, gross unrealized losses (990) 0
Long | U.S. Treasury securities    
Securities, Available-for-sale [Line Items]    
Current Principal 1,424  
Unamortized Premium (Discount) 233  
Amortized Cost 1,657  
Gross Unrealized Gains 0  
Gross Unrealized Losses (3)  
Securities, at fair value(1) $ 1,654  
Long | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 2.00%  
Weighted Average Yield 1.33%  
Weighted average life 29 years 10 months 24 days  
Short    
Securities, Available-for-sale [Line Items]    
Current Principal $ (13,234) (73,349)
Unamortized Premium (Discount) 65 508
Investment Sold, Not yet Purchased, Sale Proceeds (13,169) (72,841)
Gross Unrealized Gains 23 63
Gross Unrealized Losses (145) (631)
Securities sold short, at fair value $ (13,291) $ (73,409)
Short | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.22% 1.65%
Weighted Average Yield 0.41% 1.66%
Weighted average life 4 years 10 months 24 days 5 years 5 months 26 days
Short | Corporate debt securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ (1,650) $ (450)
Unamortized Premium (Discount) 244 (6)
Investment Sold, Not yet Purchased, Sale Proceeds (1,406) (456)
Gross Unrealized Gains 23 0
Gross Unrealized Losses (36) (15)
Securities sold short, at fair value $ (1,419) $ (471)
Short | Corporate debt securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 3.91% 5.44%
Weighted Average Yield 5.21% 5.21%
Weighted average life 21 years 8 months 26 days 4 years 10 months 24 days
Short | U.S. Treasury securities    
Securities, Available-for-sale [Line Items]    
Current Principal $ (2,000) $ (63,140)
Unamortized Premium (Discount) (151) 381
Investment Sold, Not yet Purchased, Sale Proceeds (2,151) (62,759)
Gross Unrealized Gains 0 63
Gross Unrealized Losses (3) (298)
Securities sold short, at fair value $ (2,154) $ (62,994)
Short | U.S. Treasury securities | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.50% 1.76%
Weighted Average Yield 0.71% 1.87%
Weighted average life 9 years 10 months 17 days 6 years 1 month 9 days
Short | European sovereign bonds    
Securities, Available-for-sale [Line Items]    
Current Principal $ (9,584) $ (9,759)
Unamortized Premium (Discount) (28) 133
Investment Sold, Not yet Purchased, Sale Proceeds (9,612) (9,626)
Gross Unrealized Gains 0 0
Gross Unrealized Losses (106) (318)
Securities sold short, at fair value $ (9,718) $ (9,944)
Short | European sovereign bonds | Weighted Average    
Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 0.76% 0.77%
Weighted Average Yield 0.12% 0.12%
Weighted average life 1 year 3 months 29 days 1 year 6 months 29 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.