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Schedule of Mortgage-Backed Securities by Weighted Average Life (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,173,593	$ 1,242,266
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	27,631	31,401
Amortized Cost	$ 26,175	$ 30,395
Weighted Average Coupon Rate, Percent	2.62%	2.48%
Less than three years [Member] | Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 2,395	$ 2,558
Amortized Cost	$ 1,371	$ 1,543
Weighted Average Coupon Rate, Percent	3.23%	3.21%
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	$ 23,144	$ 24,736
Amortized Cost	$ 23,498	$ 25,478
Weighted Average Coupon Rate, Percent	2.70%	2.66%
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	$ 2,092	$ 4,107
Amortized Cost	$ 1,306	$ 3,374
Weighted Average Coupon Rate, Percent	0.59%	0.55%
Greater than eleven years [Member] | Non-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%
Fixed Rate [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,139,031	$ 1,203,107
Amortized Cost	$ 1,125,580	$ 1,200,329
Weighted Average Coupon Rate, Percent	4.04%	4.04%
Fixed Rate [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 56,198	$ 30,054
Amortized Cost	$ 55,792	$ 30,227
Weighted Average Coupon Rate, Percent	4.72%	4.76%
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	$ 426,760	$ 273,477
Amortized Cost	$ 420,717	$ 273,107
Weighted Average Coupon Rate, Percent	4.05%	3.78%
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	$ 654,427	$ 893,730
Amortized Cost	$ 647,435	$ 891,112
Weighted Average Coupon Rate, Percent	3.98%	4.10%
Fixed Rate [Member] | Greater than eleven years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,646	$ 5,846
Amortized Cost	$ 1,636	$ 5,883
Weighted Average Coupon Rate, Percent	4.00%	3.81%
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 6,931	$ 7,758
Amortized Cost	$ 8,660	$ 8,491
Weighted Average Coupon Rate, Percent	3.88%	3.82%
Interest-Only [Member] | Less than three years [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 4,859	$ 4,974
Amortized Cost	$ 6,335	$ 5,701
Weighted Average Coupon Rate, Percent	3.67%	3.55%
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	$ 2,072	$ 2,784
Amortized Cost	$ 2,325	$ 2,790
Weighted Average Coupon Rate, Percent	5.06%	4.97%
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	$ 0	$ 0
Amortized Cost	$ 0	$ 0
Weighted Average Coupon Rate, Percent	0.00%	0.00%
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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