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Schedule of Mortgage-Backed Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Mortgage-Backed Securities [Line Items]    
Mortgage-backed securities, at fair value $ 1,394,568 $ 1,540,296
Residential Mortgage Backed Securities [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal 1,304,349 1,482,349
Unamortized Premium (Discount) 55,698 64,576
Amortized Cost 1,372,191 1,563,665
Gross Unrealized Gain on Securities 26,776 6,149
Gross Unrealized Losses on Securities (4,399) (29,518)
Mortgage-backed securities, at fair value $ 1,394,568 $ 1,540,296
Weighted Average Coupon 4.03% 4.19%
Weighted Average Yield 3.21% 3.50%
Weighted Average Life (Years) 5 years 120 days 7 years 135 days
Non-Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 11,128 $ 13,755
Unamortized Premium (Discount) (4,084) (4,324)
Amortized Cost 7,044 9,431
Gross Unrealized Gain on Securities 2,132 1,806
Gross Unrealized Losses on Securities 0 (4)
Mortgage-backed securities, at fair value $ 9,176 $ 11,233
Weighted Average Coupon 3.91% 4.38%
Weighted Average Yield 11.38% 12.59%
Weighted Average Life (Years) 5 years 321 days 5 years 252 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 153,142 $ 135,537
Unamortized Premium (Discount) 2,771 3,307
Amortized Cost 155,913 138,844
Gross Unrealized Gain on Securities 4,193 655
Gross Unrealized Losses on Securities (94) (1,968)
Mortgage-backed securities, at fair value $ 160,012 $ 137,531
Weighted Average Coupon 3.46% 3.56%
Weighted Average Yield 2.94% 2.88%
Weighted Average Life (Years) 4 years 40 days 4 years 330 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 17,251 $ 7,267
Unamortized Premium (Discount) 742 575
Amortized Cost 17,993 7,842
Gross Unrealized Gain on Securities 355 0
Gross Unrealized Losses on Securities 0 (337)
Mortgage-backed securities, at fair value $ 18,348 $ 7,505
Weighted Average Coupon 4.54% 4.00%
Weighted Average Yield 3.37% 2.53%
Weighted Average Life (Years) 4 years 15 days 5 years 321 days
30-year fixed rate mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 996,703 $ 1,237,047
Unamortized Premium (Discount) 47,996 57,470
Amortized Cost 1,044,699 1,294,517
Gross Unrealized Gain on Securities 17,757 2,731
Gross Unrealized Losses on Securities (3,537) (23,734)
Mortgage-backed securities, at fair value $ 1,058,919 $ 1,273,514
Weighted Average Coupon 4.21% 4.22%
Weighted Average Yield 3.26% 3.48%
Weighted Average Life (Years) 5 years 325 days 8 years 37 days
Adjustable Rate Mortgages | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 36,681 $ 17,752
Unamortized Premium (Discount) 1,193 1,217
Amortized Cost 37,874 18,969
Gross Unrealized Gain on Securities 339 1
Gross Unrealized Losses on Securities (101) (727)
Mortgage-backed securities, at fair value $ 38,112 $ 18,243
Weighted Average Coupon 3.85% 4.02%
Weighted Average Yield 2.27% 2.63%
Weighted Average Life (Years) 2 years 303 days 3 years 330 days
Reverse mortgages [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 89,444 $ 70,991
Unamortized Premium (Discount) 7,080 6,331
Amortized Cost 96,524 77,322
Gross Unrealized Gain on Securities 1,946 5
Gross Unrealized Losses on Securities (34) (1,423)
Mortgage-backed securities, at fair value $ 98,436 $ 75,904
Weighted Average Coupon 4.60% 4.61%
Weighted Average Yield 2.85% 2.90%
Weighted Average Life (Years) 5 years 270 days 5 years 212 days
Interest-Only [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Amortized Cost $ 12,144 $ 16,740
Gross Unrealized Gain on Securities 54 951
Gross Unrealized Losses on Securities (633) (1,325)
Mortgage-backed securities, at fair value $ 11,565 $ 16,366
Weighted Average Coupon 3.03% 4.41%
Weighted Average Yield 2.99% 9.00%
Weighted Average Life (Years) 3 years 113 days 4 years 88 days
Agency Securities [Member] | Agency RMBS [Member]    
Mortgage-Backed Securities [Line Items]    
Current Principal $ 1,293,221 $ 1,468,594
Unamortized Premium (Discount) 59,782 68,900
Amortized Cost 1,365,147 1,554,234
Gross Unrealized Gain on Securities 24,644 4,343
Gross Unrealized Losses on Securities (4,399) (29,514)
Mortgage-backed securities, at fair value $ 1,385,392 $ 1,529,063
Weighted Average Coupon 4.03% 4.19%
Weighted Average Yield 3.17% 3.45%
Weighted Average Life (Years) 5 years 117 days 7 years 139 days