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Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Zions Bancorporation, National Association | Sales of Farmer Mac Guaranteed Securities |  |  |
Related Party Transaction [Line Items] |  |  |
Sales of Farmer Mac Guaranteed Securities | $ 41,247 | $ 163,134 | $ 68,721
Zions Bancorporation, National Association | USDA Guarantee | USDA Securities: |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 10,764 | 8,875 | 19,120
Zions Bancorporation, National Association | Mortgages | Farm & Ranch |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 177,143 | 129,040 | 114,719
CFC |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 542,443 | 660,000 | 986,645
CFC | AgVantage Securities | Guarantee Obligations |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 250,000 | 575,000 | 675,000
CFC | AgVantage Securities | Revolving Credit Facility | Off-balance sheet |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 19,500 | 0 | 0
CFC | AgVantage Securities | US Government-sponsored Enterprises Debt Securities | Off-balance sheet |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | 0 | 0 | 300,000
CFC | Real Estate Loan |  |  |
Related Party Transaction [Line Items] |  |  |
Unpaid principal balance | $ 272,943 | $ 85,000 | $ 11,645

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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