Investments In Securities - Trading Securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Agency Securities | ||
| Fair Value | ||
| Less than 12 months, fair value | $ 831,339 | |
| 12 months or more, fair value | 0 | |
| Total, fair value | 831,339 | |
| Unrealized Losses | ||
| Less than 12 months, unrealized loss | (2,653) | |
| 12 months or more, unrealized loss | 0 | |
| Total, unrealized loss | $ (2,653) | |
| Credit Risk and Non-Agency Securities | ||
| Fair Value | ||
| Less than 12 months, fair value | $ 362 | |
| 12 months or more, fair value | 0 | |
| Total, fair value | 362 | |
| Unrealized Losses | ||
| Less than 12 months, unrealized loss | (3) | |
| 12 months or more, unrealized loss | 0 | |
| Total, unrealized loss | $ (3) |