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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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- Definition 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 + Details
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