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Farmer Mac Guaranteed Securities and USDA Securities - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Unrealized loss position for less than 12 months    
Fair Value $ 1,038,301 $ 1,433,453
Unrealized Loss (1,591) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 343,049 315,786
Unrealized Loss (2,658) (2,647)
Farmer Mac Guaranteed Securities and USDA Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 17,081 707,813
Unrealized Loss (57) (2,456)
Unrealized loss position for more than 12 months    
Fair Value 596,546 3,042,061
Unrealized Loss (1,933) (71,719)
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 0 669,610
Unrealized Loss 0 (1,760)
Unrealized loss position for more than 12 months    
Fair Value 316,340 976,318
Unrealized Loss (660) (10,188)
Unrealized loss position for less than 12 months    
Fair Value 507,482 1,480,423
Unrealized Loss (1,107) (9,364)
Unrealized loss position for more than 12 months    
Fair Value 1,623,361 1,599,679
Unrealized Loss (37,115) (42,003)
USDA Guarantees [Member] | Farmer Mac Guaranteed Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 17,081  
Unrealized Loss (57)  
Unrealized loss position for more than 12 months    
Fair Value 0  
Unrealized Loss 0  
USDA Guarantees [Member] | USDA Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 0 38,203
Unrealized Loss 0 (696)
Unrealized loss position for more than 12 months    
Fair Value 280,206 2,065,743
Unrealized Loss $ (1,273) $ (61,531)