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Organization - Organization (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | $ 19,724,524 | $ 19,007,311 | $ 17,399,475
Farm & Ranch [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 7,233,972 | 6,867,586 | 6,139,304
USDA Guarantees [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 2,515,620 | 2,352,214 | 2,094,375
Rural Utilities [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 1,592,115 | 1,882,633 | 1,878,110
Institutional Credit [Member] [Member] |  |  |
Product Information [Line Items] |  |  |
On and Off Balance Sheet Program Assets, At Principal Balance | 8,382,817 | $ 7,904,878 | $ 7,287,686
Notes Payable to Banks [Member] |  |  |
Product Information [Line Items] |  |  |
Notes Payable | 1,600,000 |  |
Medium-term Notes [Member] |  |  |
Product Information [Line Items] |  |  |
Notes Payable | $ 14,600,000 |  |

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