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Farmer Mac Guaranteed Securities and USDA Securities - Narrative (Details) $ in Millions | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 security
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USDA Securities | USDA Securities: | Payment Deferral, CARES Act | Loans Insured or Guaranteed by US Government Authorities, CARES Act |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid principal balances | $ | $ 92.9 |
AgVantage Securities | Farmer Mac Guaranteed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, securities in unrealized loss positions | 11 | 17
Held-to-maturity, securities in unrealized loss positions | 2 | 4
Number of securities in loss position | 7 | 13

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