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Schedule of Mortgage-Backed Securities by Weighted Average Life (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,050,521	$ 1,401,778
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	7,520	8,851
Amortized Cost	$ 6,620	$ 6,924
Weighted Average Coupon Rate, Percent	3.26%	3.73%
Less than three years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,840	$ 4,000
Amortized Cost	$ 1,779	$ 3,823
Weighted Average Coupon Rate, Percent	5.01%	5.35%
Greater than three years and less than seven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,636	$ 784
Amortized Cost	$ 351	$ 307
Weighted Average Coupon Rate, Percent	2.19%	3.88%
Greater than seven years and less than eleven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 2,226	$ 4,067
Amortized Cost	$ 2,656	$ 2,794
Weighted Average Coupon Rate, Percent	1.58%	2.29%
Greater than eleven years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,818	$ 0
Amortized Cost	$ 1,834	$ 0
Weighted Average Coupon Rate, Percent	5.78%	0.00%
Fixed Rate [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,027,372	$ 1,374,683
Amortized Cost	$ 994,067	$ 1,351,210
Weighted Average Coupon Rate, Percent	4.08%	4.10%
Fixed Rate [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 140,016	$ 53,620
Amortized Cost	$ 136,852	$ 52,683
Weighted Average Coupon Rate, Percent	4.33%	4.72%
Fixed Rate [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 842,456	$ 793,820
Amortized Cost	$ 812,785	$ 778,950
Weighted Average Coupon Rate, Percent	4.03%	4.18%
Fixed Rate [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 44,900	$ 496,334
Amortized Cost	$ 44,430	$ 488,956
Weighted Average Coupon Rate, Percent	4.06%	3.92%
Fixed Rate [Member] | Greater than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 0	$ 30,909
Amortized Cost	$ 0	$ 30,621
Weighted Average Coupon Rate, Percent	0.00%	3.97%
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 15,629	$ 18,244
Amortized Cost	$ 17,266	$ 17,795
Weighted Average Coupon Rate, Percent	3.25%	3.22%
Interest-Only [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 5,309	$ 3,695
Amortized Cost	$ 5,855	$ 3,407
Weighted Average Coupon Rate, Percent	4.60%	4.53%
Interest-Only [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 10,190	$ 14,446
Amortized Cost	$ 11,308	$ 14,283
Weighted Average Coupon Rate, Percent	2.68%	2.93%
Interest-Only [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 130	$ 103
Amortized Cost	$ 103	$ 105
Weighted Average Coupon Rate, Percent	0.34%	0.33%
Interest-Only [Member] | Greater than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 0	$ 0
Amortized Cost	$ 0	$ 0
Weighted Average Coupon Rate, Percent	0.00%	0.00%

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Cost of the investment.

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