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Schedule of Mortgage-Backed Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Mortgage-Backed Securities [Line Items] |  |
Mortgage-backed securities, at fair value | $ 1,050,521 | $ 1,401,778
Residential Mortgage Backed Securities [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | 963,646 | 1,305,706
Unamortized Premium (Discount) | 37,041 | 52,428
Amortized Cost | 1,017,953 | 1,375,929
Gross Unrealized Gain on Securities | 36,788 | 28,518
Gross Unrealized Losses on Securities | (4,220) | (2,669)
Mortgage-backed securities, at fair value | $ 1,050,521 | $ 1,401,778
Weighted Average Coupon | 3.94% | 3.98%
Weighted Average Yield | 3.11% | 3.17%
Weighted Average Life (Years) | 4 years 29 days | 5 years 11 months 1 day
Non-Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 10,507 | $ 10,947
Unamortized Premium (Discount) | (3,887) | (4,023)
Amortized Cost | 6,620 | 6,924
Gross Unrealized Gain on Securities | 1,395 | 1,928
Gross Unrealized Losses on Securities | (495) | (1)
Mortgage-backed securities, at fair value | $ 7,520 | $ 8,851
Weighted Average Coupon | 3.26% | 3.73%
Weighted Average Yield | 10.81% | 13.48%
Weighted Average Life (Years) | 5 years 1 month 6 days | 5 years 11 months 4 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 124,511 | $ 173,350
Unamortized Premium (Discount) | 2,519 | 3,498
Amortized Cost | 127,030 | 176,848
Gross Unrealized Gain on Securities | 5,347 | 4,424
Gross Unrealized Losses on Securities | (2) | (41)
Mortgage-backed securities, at fair value | $ 132,375 | $ 181,231
Weighted Average Coupon | 3.53% | 3.45%
Weighted Average Yield | 2.92% | 2.89%
Weighted Average Life (Years) | 3 years 7 months 28 days | 4 years 21 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 1,087 | $ 1,276
Unamortized Premium (Discount) | 78 | 80
Amortized Cost | 1,165 | 1,356
Gross Unrealized Gain on Securities | 22 | 29
Gross Unrealized Losses on Securities | 0 | 0
Mortgage-backed securities, at fair value | $ 1,187 | $ 1,385
Weighted Average Coupon | 5.00% | 5.00%
Weighted Average Yield | 3.42% | 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 | $ 708,062 | $ 996,451
Unamortized Premium (Discount) | 30,759 | 45,099
Amortized Cost | 738,821 | 1,041,550
Gross Unrealized Gain on Securities | 27,106 | 19,676
Gross Unrealized Losses on Securities | (707) | (2,348)
Mortgage-backed securities, at fair value | $ 765,220 | $ 1,058,878
Weighted Average Coupon | 4.13% | 4.18%
Weighted Average Yield | 3.05% | 3.12%
Weighted Average Life (Years) | 4 years 2 months 23 days | 6 years 8 months 15 days
Adjustable Rate Mortgages | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 28,823 | $ 32,122
Unamortized Premium (Discount) | 1,013 | 927
Amortized Cost | 29,836 | 33,049
Gross Unrealized Gain on Securities | 490 | 264
Gross Unrealized Losses on Securities | (93) | (58)
Mortgage-backed securities, at fair value | $ 30,233 | $ 33,255
Weighted Average Coupon | 3.74% | 3.79%
Weighted Average Yield | 2.13% | 2.41%
Weighted Average Life (Years) | 3 years 1 month 17 days | 4 years 2 months 12 days
Reverse mortgages [Member] | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 90,656 | $ 91,560
Unamortized Premium (Discount) | 6,559 | 6,847
Amortized Cost | 97,215 | 98,407
Gross Unrealized Gain on Securities | 1,951 | 1,549
Gross Unrealized Losses on Securities | (809) | (22)
Mortgage-backed securities, at fair value | $ 98,357 | $ 99,934
Weighted Average Coupon | 4.49% | 4.53%
Weighted Average Yield | 2.78% | 2.73%
Weighted Average Life (Years) | 5 years 4 months 9 days | 5 years 7 months 28 days
Interest-Only [Member] | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Amortized Cost | $ 17,266 | $ 17,795
Gross Unrealized Gain on Securities | 477 | 648
Gross Unrealized Losses on Securities | (2,114) | (199)
Mortgage-backed securities, at fair value | $ 15,629 | $ 18,244
Weighted Average Coupon | 3.25% | 3.22%
Weighted Average Yield | 7.92% | 9.11%
Weighted Average Life (Years) | 3 years 3 months 7 days | 3 years 11 months 19 days
Agency Securities [Member] | Agency RMBS [Member] |  |
Mortgage-Backed Securities [Line Items] |  |
Current Principal | $ 953,139 | $ 1,294,759
Unamortized Premium (Discount) | 40,928 | 56,451
Amortized Cost | 1,011,333 | 1,369,005
Gross Unrealized Gain on Securities | 35,393 | 26,590
Gross Unrealized Losses on Securities | (3,725) | (2,668)
Mortgage-backed securities, at fair value | $ 1,043,001 | $ 1,392,927
Weighted Average Coupon | 3.94% | 3.99%
Weighted Average Yield | 3.06% | 3.12%
Weighted Average Life (Years) | 4 years 25 days | 5 years 11 months 1 day

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