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Investment in Securities (Summary of Investment in Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Securities, Available-for-sale [Line Items]      
Current Principal   $ 1,993,242 $ 1,408,233
Unamortized Premium (Discount)   (143,262) (196,118)
Amortized Cost   1,975,520 1,474,155
Gross Unrealized Gains   36,882 60,617
Gross Unrealized Losses   (45,567) (59,229)
Investment Owned At Fair Value, Net   1,966,835 1,475,543
Securities, at fair value(1)(2) [1],[2]   2,087,360 1,514,185
Securities sold short, at fair value   $ (120,525) $ (38,642)
Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.52% 3.92%
Weighted Average Yield 4.77% 3.24%  
Weighted average life 4 years 5 months 26 days 5 years 11 months 8 days  
Long      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 2,115,078 $ 1,446,237
Unamortized Premium (Discount)   (144,853) (199,280)
Amortized Cost   2,095,765 1,508,997
Gross Unrealized Gains   36,320 60,617
Gross Unrealized Losses   (44,725) (55,429)
Securities, at fair value(1)(2)   $ 2,087,360 $ 1,514,185
Long | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.37% 3.84%
Weighted Average Yield 4.88% 3.37%  
Weighted average life 4 years 5 months 12 days 5 years 10 months 24 days  
Long | 15-year fixed-rate mortgages      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 223,140 $ 67,875
Unamortized Premium (Discount)   10,668 2,543
Amortized Cost   233,808 70,418
Gross Unrealized Gains   696 1,832
Gross Unrealized Losses   (1,953) (36)
Securities, at fair value(1)(2)   $ 232,551 $ 72,214
Long | 15-year fixed-rate mortgages | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   2.65% 3.30%
Weighted Average Yield 1.83% 1.44%  
Weighted average life 3 years 2 months 26 days 4 years 5 months 12 days  
Long | 20-year fixed-rate mortgages      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 46,353 $ 50,131
Unamortized Premium (Discount)   2,800 3,097
Amortized Cost   49,153 53,228
Gross Unrealized Gains   16 182
Gross Unrealized Losses   (1,280) 0
Securities, at fair value(1)(2)   $ 47,889 $ 53,410
Long | 20-year fixed-rate mortgages | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   2.42% 2.57%
Weighted Average Yield 1.08% 1.31%  
Weighted average life 4 years 5 months 15 days 5 years 7 months 13 days  
Long | 30-year fixed-rate mortgages      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 1,265,499 $ 626,021
Unamortized Premium (Discount)   59,047 30,738
Amortized Cost   1,324,546 656,759
Gross Unrealized Gains   8,187 25,765
Gross Unrealized Losses   (12,311) (444)
Securities, at fair value(1)(2)   $ 1,320,422 $ 682,080
Long | 30-year fixed-rate mortgages | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.01% 3.99%
Weighted Average Yield 2.35% 2.13%  
Weighted average life 4 years 2 months 1 day 7 years  
Long | Adjustable rate mortgages      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 9,131 $ 6,171
Unamortized Premium (Discount)   566 159
Amortized Cost   9,697 6,330
Gross Unrealized Gains   25 124
Gross Unrealized Losses   (266) 0
Securities, at fair value(1)(2)   $ 9,456 $ 6,454
Long | Adjustable rate mortgages | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.15% 3.66%
Weighted Average Yield 2.27% 2.12%  
Weighted average life 3 years 5 months 1 day 4 years 7 months 13 days  
Long | Reverse mortgages      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 50,601 $ 89,383
Unamortized Premium (Discount)   3,215 5,152
Amortized Cost   53,816 94,535
Gross Unrealized Gains   300 3,123
Gross Unrealized Losses   (1,106) (29)
Securities, at fair value(1)(2)   $ 53,010 $ 97,629
Long | Reverse mortgages | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.06% 3.97%
Weighted Average Yield 2.37% 2.21%  
Weighted average life 4 years 7 months 6 days 4 years 2 months 1 day  
Long | Interest only securities      
Securities, Available-for-sale [Line Items]      
Amortized Cost   $ 32,607 $ 43,406
Gross Unrealized Gains   3,371 5,808
Gross Unrealized Losses   (2,690) (1,558)
Securities, at fair value(1)(2)   $ 33,288 $ 47,656
Long | Interest only securities | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.46% 3.36%
Weighted Average Yield 10.01% 8.91%  
Weighted average life 4 years 10 months 6 days 4 years 3 months 29 days  
Long | Non-Agency RMBS      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 326,762 $ 321,842
Unamortized Premium (Discount)   (130,015) (131,083)
Amortized Cost   196,747 190,759
Gross Unrealized Gains   10,276 15,880
Gross Unrealized Losses   (5,418) (5,549)
Securities, at fair value(1)(2)   $ 201,605 $ 201,090
Long | Non-Agency RMBS | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   4.17% 3.15%
Weighted Average Yield 6.40% 6.15%  
Weighted average life 5 years 5 months 15 days 3 years 11 months 26 days  
Long | CMBS      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 46,873 $ 188,085
Unamortized Premium (Discount)   (23,570) (61,763)
Amortized Cost   23,303 126,322
Gross Unrealized Gains   469 1,655
Gross Unrealized Losses   (892) (16,910)
Securities, at fair value(1)(2)   $ 22,880 $ 111,067
Long | CMBS | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   2.84% 2.71%
Weighted Average Yield 7.47% 7.00%  
Weighted average life 8 years 1 month 2 days 7 years 10 months 6 days  
Long | Non-Agency IOs      
Securities, Available-for-sale [Line Items]      
Amortized Cost   $ 16,701 $ 8,123
Gross Unrealized Gains   1,405 1,792
Gross Unrealized Losses   (394) (305)
Securities, at fair value(1)(2)   $ 17,712 $ 9,610
Long | Non-Agency IOs | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   0.64% 1.17%
Weighted Average Yield 18.85% 14.71%  
Weighted average life 3 years 5 months 26 days 5 years 5 months 4 days  
Long | CLOs      
Securities, Available-for-sale [Line Items]      
Amortized Cost   $ 70,444 $ 208,907
Gross Unrealized Gains   5,919 2,563
Gross Unrealized Losses   (14,034) (30,199)
Securities, at fair value(1)(2)   $ 62,329 $ 181,271
Long | CLOs | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   3.59% 3.67%
Weighted Average Yield 8.50% 8.94%  
Weighted average life 3 years 6 months 3 years 1 month 9 days  
Long | Asset-backed securities, backed by consumer loans      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 118,154 $ 69,646
Unamortized Premium (Discount)   (43,139) (24,936)
Amortized Cost   75,015 44,710
Gross Unrealized Gains   1,242 221
Gross Unrealized Losses   (3,149) (6)
Securities, at fair value(1)(2)   $ 73,108 $ 44,925
Long | Asset-backed securities, backed by consumer loans | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   11.65% 11.95%
Weighted Average Yield 18.57% 14.80%  
Weighted average life 1 year 1 month 9 days 1 year 3 months 18 days  
Long | Corporate debt securities      
Securities, Available-for-sale [Line Items]      
Current Principal   $ 28,565 $ 27,083
Unamortized Premium (Discount)   (24,425) (23,187)
Amortized Cost   4,140 3,896
Gross Unrealized Gains   1,723 1,296
Gross Unrealized Losses   (309) (3)
Securities, at fair value(1)(2)   $ 5,554 $ 5,189
Long | Corporate debt securities | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   0.65% 2.13%
Weighted Average Yield 6.75% 7.50%  
Weighted average life 3 years 1 month 6 days 1 year 11 months 15 days  
Long | Corporate equity securities      
Securities, Available-for-sale [Line Items]      
Amortized Cost   $ 5,788 $ 1,604
Gross Unrealized Gains   2,691 376
Gross Unrealized Losses   (923) (390)
Securities, at fair value(1)(2)   7,556 1,590
Short      
Securities, Available-for-sale [Line Items]      
Current Principal   (121,836) (38,004)
Unamortized Premium (Discount)   1,591 3,162
Investment Sold, Not yet Purchased, Sale Proceeds   (120,245) (34,842)
Gross Unrealized Gains   562 0
Gross Unrealized Losses   (842) (3,800)
Securities sold short, at fair value   $ (120,525) $ (38,642)
Short | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   0.87% 0.26%
Weighted Average Yield 0.09% 1.02%  
Weighted average life 3 years 1 month 17 days 6 years 8 months 23 days  
Short | Corporate debt securities      
Securities, Available-for-sale [Line Items]      
Current Principal     $ (200)
Unamortized Premium (Discount)     (1)
Investment Sold, Not yet Purchased, Sale Proceeds     (201)
Gross Unrealized Gains     0
Gross Unrealized Losses     (17)
Securities sold short, at fair value     $ (218)
Short | Corporate debt securities | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon     5.09%
Weighted Average Yield 4.67%    
Weighted average life 6 years 5 months 1 day    
Short | U.S. Treasury 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 | U.S. Treasury 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 | European sovereign bonds      
Securities, Available-for-sale [Line Items]      
Current Principal   $ (28,086) $ (37,804)
Unamortized Premium (Discount)   170 3,163
Investment Sold, Not yet Purchased, Sale Proceeds   (27,916) (34,641)
Gross Unrealized Gains   156 0
Gross Unrealized Losses   (575) (3,783)
Securities sold short, at fair value   $ (28,335) $ (38,424)
Short | European sovereign bonds | Weighted Average      
Securities, Available-for-sale [Line Items]      
Weighted Average Coupon   0.01% 0.23%
Weighted Average Yield 0.06% 0.05%  
Weighted average life 3 years 1 month 9 days 3 years 2 months 4 days  
[1] Ellington Financial Inc.'s 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.