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Related Party Transactions - Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
Zions First National Bank [Member] |
Related Party Transaction [Line Items] |
Schedule of Related Party Transactions [Table Text Block] | The following transactions occurred between Farmer Mac and Zions during 2018, 2017, and 2016: Table 3.1
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Unpaid Principal Balance: |  |  |  |  |
Purchases: |  |  |  |  |
Loans | $ | 114,719 |  |  | $ | 126,449 |  |  | $ | 153,140 |
USDA Securities | 19,120 |  |  | 20,368 |  |  | 16,600 |
Sales of Farmer Mac Guaranteed Securities | 68,721 |  |  | 128,924 |  |  | 273,586 |
CFC [Member] |
Related Party Transaction [Line Items] |
Schedule of Related Party Transactions [Table Text Block] | The following transactions occurred between Farmer Mac and CFC during 2018, 2017, and 2016: Table 3.2
Farmer Mac Loan Purchases and Guarantees
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Unpaid Principal Balance: |  |  |  |  |
Loans | $ | 11,645 |  |  | $ | 137,341 |  |  | $ | 50,491 |
On-balance sheet AgVantage Securities | 675,000 |  |  | 350,000 |  |  | 250,000 |
Off-balance sheet revolving floating rate AgVantage facility | 300,000 |  |  | — |  |  | — |
LTSPCs | — |  |  | — |  |  | 441,404 |
Total purchases and guarantees | $ | 986,645 |  |  | $ | 487,341 |  |  | $ | 741,895 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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