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Farmer Mac Guaranteed Securities and USDA Securities - Narrative (Details) $ in Millions | Jun. 30, 2020 security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Institutional Credit | Farmer Mac Guaranteed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, securities in unrealized loss positions | 13 | 17
Held-to-maturity, securities in unrealized loss positions | 0 | 4
Number of securities in loss position | 6 | 13
USDA Guarantees | 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 | $ |  | $ 50.1

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