Basis of Presentation and Significant Accounting Policies Asset Acquisition (Details) |
Jul. 31, 2018 |
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| Basis of Presentation and Significant Accounting Policies [Abstract] | |
| Agency RMBS, as a percentage of gross assets, acquired in connection with the acquisition of CYS Investments, Inc. | 89.00% |
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- Definition Basis of Presentation and Significant Accounting Policies [Abstract] No definition available.
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- Definition Percent of similar identifiable assets of the gross assets acquired in a business combination No definition available.
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