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Schedule of Mortgage-Backed Securities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Mortgage-Backed Securities [Line Items]    
Mortgage-backed securities, at fair value $ 1,154,047 $ 1,401,778
Residential Mortgage Backed Securities [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal 1,065,092 1,305,706
Unamortized Premium (Discount) 24,719 52,428
Amortized Cost 1,105,834 1,375,929
Gross Unrealized Gain on Securities 50,424 28,518
Gross Unrealized Losses on Securities (2,211) (2,669)
Mortgage-backed securities, at fair value $ 1,154,047 $ 1,401,778
Weighted Average Coupon 3.66% 3.98%
Weighted Average Yield 2.95% 3.17%
Weighted Average Life (Years) 4 years 3 months 5 years 11 months 1 day
Non-Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 58,642 $ 10,947
Unamortized Premium (Discount) (19,626) (4,023)
Amortized Cost 39,016 6,924
Gross Unrealized Gain on Securities 2,991 1,928
Gross Unrealized Losses on Securities (20) (1)
Mortgage-backed securities, at fair value $ 41,987 $ 8,851
Weighted Average Coupon 1.31% 3.73%
Weighted Average Yield 6.37% 13.48%
Weighted Average Life (Years) 6 years 6 months 14 days 5 years 11 months 4 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 64,491 $ 173,350
Unamortized Premium (Discount) 1,681 3,498
Amortized Cost 66,172 176,848
Gross Unrealized Gain on Securities 3,004 4,424
Gross Unrealized Losses on Securities (7) (41)
Mortgage-backed securities, at fair value $ 69,169 $ 181,231
Weighted Average Coupon 3.61% 3.45%
Weighted Average Yield 2.66% 2.89%
Weighted Average Life (Years) 3 years 3 months 14 days 4 years 21 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 1,077 $ 1,276
Unamortized Premium (Discount) 71 80
Amortized Cost 1,148 1,356
Gross Unrealized Gain on Securities 43 29
Gross Unrealized Losses on Securities 0 0
Mortgage-backed securities, at fair value $ 1,191 $ 1,385
Weighted Average Coupon 5.00% 5.00%
Weighted Average Yield 3.19% 3.34%
Weighted Average Life (Years) 4 years 5 months 15 days 5 years 1 month 2 days
30-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 825,850 $ 996,451
Unamortized Premium (Discount) 36,144 45,099
Amortized Cost 861,994 1,041,550
Gross Unrealized Gain on Securities 38,247 19,676
Gross Unrealized Losses on Securities (238) (2,348)
Mortgage-backed securities, at fair value $ 900,003 $ 1,058,878
Weighted Average Coupon 3.88% 4.18%
Weighted Average Yield 2.84% 3.12%
Weighted Average Life (Years) 4 years 3 months 3 days 6 years 8 months 15 days
Adjustable Rate Mortgages | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 25,471 $ 32,122
Unamortized Premium (Discount) 559 927
Amortized Cost 26,030 33,049
Gross Unrealized Gain on Securities 797 264
Gross Unrealized Losses on Securities 0 (58)
Mortgage-backed securities, at fair value $ 26,827 $ 33,255
Weighted Average Coupon 3.59% 3.79%
Weighted Average Yield 2.24% 2.41%
Weighted Average Life (Years) 3 years 2 months 12 days 4 years 2 months 12 days
Reverse mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 89,561 $ 91,560
Unamortized Premium (Discount) 5,890 6,847
Amortized Cost 95,451 98,407
Gross Unrealized Gain on Securities 4,942 1,549
Gross Unrealized Losses on Securities 0 (22)
Mortgage-backed securities, at fair value $ 100,393 $ 99,934
Weighted Average Coupon 4.10% 4.53%
Weighted Average Yield 2.51% 2.73%
Weighted Average Life (Years) 5 years 2 months 23 days 5 years 7 months 28 days
Interest-Only [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Amortized Cost $ 16,023 $ 17,795
Gross Unrealized Gain on Securities 400 648
Gross Unrealized Losses on Securities (1,946) (199)
Mortgage-backed securities, at fair value $ 14,477 $ 18,244
Weighted Average Coupon 3.21% 3.22%
Weighted Average Yield 5.01% 9.11%
Weighted Average Life (Years) 3 years 5 months 4 days 3 years 11 months 19 days
Agency Securities [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 1,006,450 $ 1,294,759
Unamortized Premium (Discount) 44,345 56,451
Amortized Cost 1,066,818 1,369,005
Gross Unrealized Gain on Securities 47,433 26,590
Gross Unrealized Losses on Securities (2,191) (2,668)
Mortgage-backed securities, at fair value $ 1,112,060 $ 1,392,927
Weighted Average Coupon 3.78% 3.99%
Weighted Average Yield 2.82% 3.12%
Weighted Average Life (Years) 4 years 1 month 17 days 5 years 11 months 1 day