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Securities, Agency IO (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Summary of our Agency IOs activity |  |  |  |  |
Balance at beginning of period |  |  | $ 5,403,463 |  |
Changes in fair value |  |  | (343,642) | $ (46,021) |
Balance at end of period | $ 4,707,085 |  | 4,707,085 |  |
Interest-only Securities (Agency IOs) under the SBL Program |  |  |  |  |
Summary of our Agency IOs activity |  |  |  |  |
Balance at beginning of period | 4,602,722 |  | 4,786,175 |  |
Additions from the Acquisition |  |  |  | 4,908,283 |
Changes in fair value | (160,190) |  | (343,643) | (46,021) |
Balance at end of period | 4,442,532 | $ 4,862,262 | 4,442,532 | 4,862,262 |
UPB | 839,200,000 |  | 839,200,000 |  | $ 904,400,000
Interest income | $ 300,000 | $ 300,000 | $ 900,000 | $ 300,000 |

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