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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
Sep. 30, 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 $ 313,714  
Available-for-sale Securities, Due after one year through five years, Amortized Cost 2,726,577  
Available-for-sale Securities, Due after five years through ten years, Amortized Cost 1,299,644  
Available-for-sale Securities, Due after ten years, Amortized Cost 2,512,781  
Available-for-sale Securities, Amortized Cost Basis 6,852,716 $ 6,047,385
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]    
Available-for-sale Securities, Due within one year, Fair Value 314,376  
Available-for-sale Securities, Due after one year through five years, Fair Value 2,756,149  
Available-for-sale Securities, Due after five years through ten years, Fair Value 1,321,453  
Available-for-sale Securities, Due after ten years, Fair Value 2,525,830  
Available-for-sale, at fair value $ 6,917,808 $ 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 1.39%  
Available-for-sale Securities, Due after one year through five years, Weighted-Average Yield 1.79%  
Available-for-sale Securities, Due after five years through ten years, Weighted-Average Yield 2.05%  
Available-for-sale Securities, Due after ten years, Weighted-Average Yield 2.63%  
Available-for-sale Securities, Total Weighted-Average Yield 2.13%