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Related Party Transactions - Zions (Details) - Zions First National Bank [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Related Party's percent of Farmer Mac Total Outstanding Book of Business | 5.00% | 5.30% |
Related Party Transaction, Expenses from Transactions with Related Party | $ 11,500 | $ 9,900 | $ 9,300
Sale of Farmer Mac Guaranteed Securities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 128,924 | $ 273,586 | $ 255,338
Common Class A, Voting [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Common Stock Ownership Percentage by a Related Party | 31.20% |  |
Farm & Ranch [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Related Party's Percent of Total Program Loans | 11.20% | 15.90% | 23.90%
Related Party Transaction, Related Party's percent of total Program | 7.50% | 11.20% | 15.20%
USDA Guarantee [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Related Party's percent of total Program | 3.80% | 3.40% | 3.60%
Mortgages [Member] | Farm & Ranch [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 126,449 | $ 153,140 | $ 178,890
USDA Securities [Member] | USDA Guarantee [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 20,368 | $ 16,600 | $ 13,718

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