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Repurchase Agreements (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Repurchase Agreements [Abstract] |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] | The following table provides information on the remaining term to maturity and original term to maturity for the Company’s repurchase agreements as of the periods indicated:
|  | December 31, 2017 |  | December 31, 2016
Remaining Term to Maturity |  | Balance |  | WAVG Original Term to Maturity |  | Balance |  | WAVG Original Term to Maturity
Less than 30 days |  | $ | 2,240,791 |  |  | 49 |  |  | $ | 2,480,213 |  |  | 58 |
30 to 90 days |  | 274,231 |  |  | 90 |  |  | 418,739 |  |  | 87 |
91 to 180 days |  | 50,880 |  |  | 121 |  |  | — |  |  | — |
Total |  | $ | 2,565,902 |  |  | 54 |  |  | $ | 2,898,952 |  |  | 63 |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] | The Company’s repurchase agreements outstanding as of December 31, 2017 and December 31, 2016 are summarized in the following tables:
|  | December 31, 2017 |  | December 31, 2016
Collateral Type |  | Balance |  | Weighted Average Rate |  | Fair Value of Collateral Pledged |  | Balance |  | Weighted Average Rate |  | Fair Value of Collateral Pledged
Agency RMBS |  | $ | 836,281 |  |  | 1.47 | % |  | $ | 867,120 |  |  | $ | 1,157,302 |  |  | 0.82 | % |  | $ | 1,191,147 |
Non-Agency RMBS |  | — |  |  | — | % |  | — |  |  | 26,149 |  |  | 1.98 | % |  | 31,952 |
Agency CMBS |  | 1,003,146 |  |  | 1.44 | % |  | 1,071,904 |  |  | 1,005,726 |  |  | 0.82 | % |  | 1,095,002 |
Non-Agency CMBS |  | 15,508 |  |  | 2.47 | % |  | 18,212 |  |  | 66,881 |  |  | 1.63 | % |  | 77,840 |
Agency CMBS IO |  | 324,163 |  |  | 2.17 | % |  | 372,077 |  |  | 346,892 |  |  | 1.57 | % |  | 407,481 |
Non-Agency CMBS IO |  | 263,694 |  |  | 2.43 | % |  | 311,571 |  |  | 291,199 |  |  | 1.67 | % |  | 341,139 |
U.S. Treasuries |  | 123,110 |  |  | 1.85 | % |  | 124,215 |  |  | — |  |  | — | % |  | — |
Securitization financing bond |  | — |  |  | — | % |  | — |  |  | 4,803 |  |  | 2.00 | % |  | 5,278 |
Total repurchase agreements |  | $ | 2,565,902 |  |  | 1.67 | % |  | $ | 2,765,099 |  |  | $ | 2,898,952 |  |  | 1.03 | % |  | $ | 3,149,839 |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] | The following table lists the counterparties with whom the Company had over 10% of its shareholders’ equity at risk (defined as the excess of collateral pledged over the borrowings outstanding):
|  | December 31, 2017
Counterparty Name |  | Balance |  | Weighted Average Rate |  | Equity at Risk
Wells Fargo Bank, N. A. and affiliates |  | $ | 311,351 |  |  | 2.43 | % |  | $ | 56,383 |

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- Definition Tabular disclosure, as of the balance sheet date, of the amount at risk under repurchase agreements with any individual counterparty or group of related counterparties which exceeds 10 percent of stockholders' equity. Includes the name of each counterparty or group of related counterparties, the amount at risk with each, and the weighted average maturity of the repurchase agreements with each. The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure, as of the most recent balance sheet date, of securities or other assets sold under repurchase agreements when this amount exceeds 10 percent of total assets. Disclosure may include the following: the type of securities or assets sold under agreements to repurchase, the carrying amount, market value (including accrued interest plus any cash or other assets on deposit. The information is segregated into securities maturing (1) overnight; (2) term up to 30 days; (3) term of 30 to 90 days; (4) term over 90 days; (5) demand. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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