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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 682,586 |
Due after one year through five years | 1,420,155 |
Due after five years through ten years | 204,350 |
Due after ten years | 1,858,636 |
Amortized Cost | 4,165,727 | $ 4,262,792
Fair Value |  |
Due within one year | 681,561 |
Due after one year through five years | 1,421,423 |
Due after five years through ten years | 202,025 |
Due after ten years | 1,840,650 |
Total | $ 4,145,659 | $ 4,191,352
Weighted- Average Yield |  |
Due within one year | 2.15% |
Due after one year through five years | 3.07% |
Due after five years through ten years | 3.45% |
Due after ten years | 3.62% |
Total | 3.18% |

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