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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] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Due within one year, Amortized Cost $ 300,000  
Available-for-sale Securities, Due after one year through five years, Amortized Cost 2,902,108  
Available-for-sale Securities, Due after five years through ten years, Amortized Cost 894,854  
Available-for-sale Securities, Due after ten years, Amortized Cost 791,942  
Available-for-sale Securities, Amortized Cost Basis 4,888,904 $ 6,047,385
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]    
Available-for-sale Securities, Due within one year, Fair Value 300,151  
Available-for-sale Securities, Due after one year through five years, Fair Value 2,913,881  
Available-for-sale Securities, Due after five years through ten years, Fair Value 891,773  
Available-for-sale Securities, Due after ten years, Fair Value 747,880  
Available-for-sale, at fair value $ 4,853,685 $ 6,040,949
Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract]    
Available-for-sale Securities, Due within one year, Weighted-Average Yield 1.44%  
Available-for-sale Securities, Due after one year through five years, Weighted-Average Yield 1.84%  
Available-for-sale Securities, Due after five years through ten years, Weighted-Average Yield 2.16%  
Available-for-sale Securities, Due after ten years, Weighted-Average Yield 1.43%  
Available-for-sale Securities, Total Weighted-Average Yield 1.81%