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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%