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Farmer Mac Guaranteed Securities and USDA Guaranteed Securities - Schedule of Available-for-sale Securities (Details) - Farmer Mac Guaranteed Securities and USDA Securities [Member] $ in Thousands | Dec. 31, 2018 USD ($)
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Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
Available-for-sale Securities, Due within one year, Amortized Cost | $ 618,461
Available-for-sale Securities, Due after one year through five years, Amortized Cost | 2,889,110
Available-for-sale Securities, Due after five years through ten years, Amortized Cost | 1,248,615
Available-for-sale Securities, Due after ten years, Amortized Cost | 1,247,343
Available-for-sale Securities, Amortized Cost Basis | 6,003,529
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |
Available-for-sale Securities, Due within one year, Fair Value | 618,825
Available-for-sale Securities, Due after one year through five years, Fair Value | 2,887,325
Available-for-sale Securities, Due after five years through ten years, Fair Value | 1,239,658
Available-for-sale Securities, Due after ten years, Fair Value | 1,228,689
Available-for-sale, at fair value | $ 5,974,497
Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] |
Available-for-sale Securities, Due within one year, Weighted-Average Yield | 2.87%
Available-for-sale Securities, Due after one year through five years, Weighted-Average Yield | 3.12%
Available-for-sale Securities, Due after five years through ten years, Weighted-Average Yield | 3.21%
Available-for-sale Securities, Due after ten years, Weighted-Average Yield | 3.61%
Available-for-sale Securities, Total Weighted-Average Yield | 3.22%

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