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Farmer Mac Guaranteed Securities and USDA Securities - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Unrealized loss position for less than 12 months    
Fair Value $ 465,469 $ 1,433,453
Unrealized Loss (1,344) (3,281)
Unrealized loss position for more than 12 months    
Fair Value 317,212 315,786
Unrealized Loss (2,569) (2,647)
Farmer Mac Guaranteed Securities and USDA Securities [Member]    
Unrealized loss position for less than 12 months    
Fair Value 0 707,813
Unrealized Loss 0 (2,456)
Unrealized loss position for more than 12 months    
Fair Value 766,000 3,042,061
Unrealized Loss (3,517) (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 480,032 976,318
Unrealized Loss (1,593) (10,188)
Unrealized loss position for less than 12 months    
Fair Value 921,296 1,480,423
Unrealized Loss (6,351) (9,364)
Unrealized loss position for more than 12 months    
Fair Value 1,378,063 1,599,679
Unrealized Loss (24,981) (42,003)
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 285,968 2,065,743
Unrealized Loss $ (1,924) $ (61,531)