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Farmer Mac Guaranteed Securities and USDA Securities - Narrative (Details) - AgVantage $ in Millions | Jul. 01, 2023 USD ($) | Sep. 30, 2023 security | Dec. 31, 2022 security
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Held-to-maturity, transfer in | $ | $ 2,700.0 |  |
Held-to-maturity, transfer in, unrealized loss | $ | 31.9 |  |
Held-to-maturity, transfer in, accumulated unrealized loss | $ | $ 31.9 |  |
Farmer Mac Guaranteed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, securities in unrealized loss positions |  | 76 | 95
Held-to-maturity, securities in unrealized loss positions |  | 59 | 37
Unrealized loss position for more than 12 months, Number of securities in loss position |  | 64 | 13
Debt securities, held-to-maturity, unrealized loss position for more than 12 months, Number of securities in loss position |  | 26 | 4

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