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Farmer Mac Guaranteed Securities and USDA Securities - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized loss position for less than 12 months |  |
Fair Value | $ 984,827 | $ 1,433,453
Unrealized Loss | (3,465) | (3,281)
Unrealized loss position for more than 12 months |  |
Fair Value | 536,464 | 315,786
Unrealized Loss | (2,886) | (2,647)
Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 246,546 | 707,813
Unrealized Loss | (886) | (2,456)
Unrealized loss position for more than 12 months |  |
Fair Value | 3,100,273 | 3,042,061
Unrealized Loss | (26,455) | (71,719)
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 212,783 | 669,610
Unrealized Loss | (67) | (1,760)
Unrealized loss position for more than 12 months |  |
Fair Value | 1,030,571 | 976,318
Unrealized Loss | (5,865) | (10,188)
Unrealized loss position for less than 12 months |  |
Fair Value | 552,404 | 1,480,423
Unrealized Loss | (3,779) | (9,364)
Unrealized loss position for more than 12 months |  |
Fair Value | 1,633,673 | 1,599,679
Unrealized Loss | (29,791) | (42,003)
USDA Guarantees [Member] | USDA Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 33,763 | 38,203
Unrealized Loss | (819) | (696)
Unrealized loss position for more than 12 months |  |
Fair Value | 2,069,702 | 2,065,743
Unrealized Loss | $ (20,590) | $ (61,531)

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