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Mortgage-Backed Securities | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Mortgage-Backed Securities | Mortgage-Backed Securities The following tables present details of the Company's mortgage-backed securities portfolio at March 31, 2020 and December 31, 2019, respectively. The Company's Agency RMBS include mortgage pass-through certificates and CMOs representing interests in or obligations backed by pools of residential mortgage loans issued or guaranteed by a U.S. government agency or government-sponsored enterprise, or "GSE." The non-Agency RMBS portfolio is not issued or guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or any agency of the U.S. Government and is therefore subject to greater credit risk. By RMBS Type March 31, 2020:
($ in thousands) |  |  |  |  |  |  | Gross Unrealized |  |  |  | Weighted Average
| Current Principal |  | Unamortized Premium (Discount) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value |  | Coupon(1) |  | Yield |  | Life (Years)(2)
Agency RMBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
15-year fixed-rate mortgages | $ | 124,511 |  |  | $ | 2,519 |  |  | $ | 127,030 |  |  | $ | 5,347 |  |  | $ | (2 | ) |  | $ | 132,375 |  |  | 3.53% |  | 2.92% |  | 3.66
20-year fixed-rate mortgages | 1,087 |  |  | 78 |  |  | 1,165 |  |  | 22 |  |  | — |  |  | 1,187 |  |  | 5.00% |  | 3.42% |  | 4.46
30-year fixed-rate mortgages | 708,062 |  |  | 30,759 |  |  | 738,821 |  |  | 27,106 |  |  | (707 | ) |  | 765,220 |  |  | 4.13% |  | 3.05% |  | 4.23
Adjustable rate mortgages | 28,823 |  |  | 1,013 |  |  | 29,836 |  |  | 490 |  |  | (93 | ) |  | 30,233 |  |  | 3.74% |  | 2.13% |  | 3.13
Reverse mortgages | 90,656 |  |  | 6,559 |  |  | 97,215 |  |  | 1,951 |  |  | (809 | ) |  | 98,357 |  |  | 4.49% |  | 2.78% |  | 5.36
Interest only securities | n/a |  |  | n/a |  |  | 17,266 |  |  | 477 |  |  | (2,114 | ) |  | 15,629 |  |  | 3.25% |  | 7.92% |  | 3.27
Total Agency RMBS | 953,139 |  |  | 40,928 |  |  | 1,011,333 |  |  | 35,393 |  |  | (3,725 | ) |  | 1,043,001 |  |  | 3.94% |  | 3.06% |  | 4.07
Non-Agency RMBS | 10,507 |  |  | (3,887 | ) |  | 6,620 |  |  | 1,395 |  |  | (495 | ) |  | 7,520 |  |  | 3.26% |  | 10.81% |  | 5.10
Total RMBS | $ | 963,646 |  |  | $ | 37,041 |  |  | $ | 1,017,953 |  |  | $ | 36,788 |  |  | $ | (4,220 | ) |  | $ | 1,050,521 |  |  | 3.94% |  | 3.11% |  | 4.08
(1) | Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral.
(2) | Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.
December 31, 2019:
($ in thousands) |  |  |  |  |  |  | Gross Unrealized |  |  |  | Weighted Average
| Current Principal |  | Unamortized Premium (Discount) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value |  | Coupon(1) |  | Yield |  | Life (Years)(2)
Agency RMBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
15-year fixed-rate mortgages | $ | 173,350 |  |  | $ | 3,498 |  |  | $ | 176,848 |  |  | $ | 4,424 |  |  | $ | (41 | ) |  | $ | 181,231 |  |  | 3.45% |  | 2.89% |  | 4.06
20-year fixed-rate mortgages | 1,276 |  |  | 80 |  |  | 1,356 |  |  | 29 |  |  | — |  |  | 1,385 |  |  | 5.00% |  | 3.34% |  | 5.09
30-year fixed-rate mortgages | 996,451 |  |  | 45,099 |  |  | 1,041,550 |  |  | 19,676 |  |  | (2,348 | ) |  | 1,058,878 |  |  | 4.18% |  | 3.12% |  | 6.71
Adjustable rate mortgages | 32,122 |  |  | 927 |  |  | 33,049 |  |  | 264 |  |  | (58 | ) |  | 33,255 |  |  | 3.79% |  | 2.41% |  | 4.20
Reverse mortgages | 91,560 |  |  | 6,847 |  |  | 98,407 |  |  | 1,549 |  |  | (22 | ) |  | 99,934 |  |  | 4.53% |  | 2.73% |  | 5.66
Interest only securities | n/a |  |  | n/a |  |  | 17,795 |  |  | 648 |  |  | (199 | ) |  | 18,244 |  |  | 3.22% |  | 9.11% |  | 3.97
Total Agency RMBS | 1,294,759 |  |  | 56,451 |  |  | 1,369,005 |  |  | 26,590 |  |  | (2,668 | ) |  | 1,392,927 |  |  | 3.99% |  | 3.12% |  | 5.92
Non-Agency RMBS | 10,947 |  |  | (4,023 | ) |  | 6,924 |  |  | 1,928 |  |  | (1 | ) |  | 8,851 |  |  | 3.73% |  | 13.48% |  | 5.93
Total RMBS | $ | 1,305,706 |  |  | $ | 52,428 |  |  | $ | 1,375,929 |  |  | $ | 28,518 |  |  | $ | (2,669 | ) |  | $ | 1,401,778 |  |  | 3.98% |  | 3.17% |  | 5.92
(1) | Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral.
(2) | Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.
By Estimated Weighted Average Life As of March 31, 2020:
($ in thousands) |  | Agency RMBS |  | Agency Interest Only Securities |  | Non-Agency RMBS
Estimated Weighted Average Life(1) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2)
Less than three years |  | $ | 140,016 |  |  | $ | 136,852 |  |  | 4.33 | % |  | $ | 5,309 |  |  | $ | 5,855 |  |  | 4.60 | % |  | $ | 1,840 |  |  | $ | 1,779 |  |  | 5.01 | %
Greater than three years and less than seven years |  | 842,456 |  |  | 812,785 |  |  | 4.03 | % |  | 10,190 |  |  | 11,308 |  |  | 2.68 | % |  | 1,636 |  |  | 351 |  |  | 2.19 | %
Greater than seven years and less than eleven years |  | 44,900 |  |  | 44,430 |  |  | 4.06 | % |  | 130 |  |  | 103 |  |  | 0.34 | % |  | 2,226 |  |  | 2,656 |  |  | 1.58 | %
Greater than eleven years |  | — |  |  | — |  |  | — | % |  | — |  |  | — |  |  | — | % |  | 1,818 |  |  | 1,834 |  |  | 5.78 | %
Total |  | $ | 1,027,372 |  |  | $ | 994,067 |  |  | 4.08 | % |  | $ | 15,629 |  |  | $ | 17,266 |  |  | 3.25 | % |  | $ | 7,520 |  |  | $ | 6,620 |  |  | 3.26 | %
(1) | Average lives of RMBS are generally shorter than stated contractual maturities.
(2) | Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral.
As of December 31, 2019:
($ in thousands) |  | Agency RMBS |  | Agency Interest Only Securities |  | Non-Agency RMBS
Estimated Weighted Average Life(1) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2) |  | Fair Value |  | Amortized Cost |  | Weighted Average Coupon(2)
Less than three years |  | $ | 53,620 |  |  | $ | 52,683 |  |  | 4.72 | % |  | $ | 3,695 |  |  | $ | 3,407 |  |  | 4.53 | % |  | $ | 4,000 |  |  | $ | 3,823 |  |  | 5.35 | %
Greater than three years and less than seven years |  | 793,820 |  |  | 778,950 |  |  | 4.18 | % |  | 14,446 |  |  | 14,283 |  |  | 2.93 | % |  | 784 |  |  | 307 |  |  | 3.88 | %
Greater than seven years and less than eleven years |  | 496,334 |  |  | 488,956 |  |  | 3.92 | % |  | 103 |  |  | 105 |  |  | 0.33 | % |  | 4,067 |  |  | 2,794 |  |  | 2.29 | %
Greater than eleven years |  | 30,909 |  |  | 30,621 |  |  | 3.97 | % |  | — |  |  | — |  |  | — | % |  | — |  |  | — |  |  | — | %
Total |  | $ | 1,374,683 |  |  | $ | 1,351,210 |  |  | 4.10 | % |  | $ | 18,244 |  |  | $ | 17,795 |  |  | 3.22 | % |  | $ | 8,851 |  |  | $ | 6,924 |  |  | 3.73 | %
(1) | Average lives of RMBS are generally shorter than stated contractual maturities.
(2) | Weighted average coupon represents the weighted average pass-through rates of the securities rather than the weighted average gross mortgage rates of the underlying collateral.
The following tables reflect the components of interest income on the Company's RMBS for the three-month periods ended March 31, 2020 and 2019:
|  | Three-Month Period Ended March 31, 2020 |  | Three-Month Period Ended March 31, 2019
($ in thousands) |  | Coupon Interest |  | Net Amortization |  | Interest Income |  | Coupon Interest |  | Net Amortization |  | Interest Income
Agency RMBS |  | $ | 14,179 |  |  | $ | (4,843 | ) |  | $ | 9,336 |  |  | $ | 16,269 |  |  | $ | (4,146 | ) |  | $ | 12,123 |
Non-Agency RMBS |  | 89 |  |  | 107 |  |  | 196 |  |  | 112 |  |  | 132 |  |  | 244 |
Total |  | $ | 14,268 |  |  | $ | (4,736 | ) |  | $ | 9,532 |  |  | $ | 16,381 |  |  | $ | (4,014 | ) |  | $ | 12,367 |
For the three-month periods ended March 31, 2020 and 2019, the Catch-up Premium Amortization Adjustment was $(0.7) million and $(0.9) million, respectively. At March 31, 2020, the Company had gross unrealized losses on RMBS of $(4.2) million, of which $(2.1) million relates to adverse changes in estimated future cash flows on Agency IOs and non-Agency RMBS, primarily resulting from an increase in expected prepayments. For the three-month period ended March 31, 2019, the Company recognized an impairment charge of $1.1 million relating to its Agency IOs, which is included in Net realized gains (losses) on securities, on the Consolidated Statement of Operations. This impairment charge was due to an adverse change in estimated future cash flows resulting from an increase in expected prepayments.

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