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Organization - Organization (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | $ 17,399,475 | $ 15,898,820 | $ 14,597,758
Medium-term Notes [Member] |  |  |
Product Information [Line Items] |  |  |
Notes Payable | 9,900,000 |  |
Discount Notes [Member] |  |  |
Product Information [Line Items] |  |  |
Notes Payable | 3,800,000 |  |
Farm & Ranch [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 6,139,304 | 5,725,299 | 5,417,174
USDA Guarantees [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 2,094,375 | 1,918,277 | 1,798,034
Rural Utilities [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 1,878,110 | 1,530,990 | 985,609
Institutional Credit [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | $ 7,287,686 | $ 6,724,254 | $ 6,396,941

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