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Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Held-to-maturity Securities (Details) - Farmer Mac Guaranteed Securities and USDA Securities [Member] - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 461,295 |
Due after one year through five years | 1,043,619 |
Due after five years through ten years | 201,354 |
Due after ten years | 1,910,412 |
Amortized Cost | 3,616,680 | $ 4,262,792
Fair Value |  |
Due within one year | 461,085 |
Due after one year through five years | 1,059,512 |
Due after five years through ten years | 202,753 |
Due after ten years | 1,928,268 |
Total | $ 3,651,618 | $ 4,191,352
Weighted- Average Yield |  |
Due within one year | 2.55% |
Due after one year through five years | 3.23% |
Due after five years through ten years | 3.44% |
Due after ten years | 3.61% |
Total | 3.36% |

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