Farmer Mac Guaranteed Securities and USDA Securities - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
(Provision for)/release of losses | $	$ (1,323)	$ 860	$ (7,805)
Rural Infrastructure Finance
Debt Securities, Available-for-sale [Line Items]
(Provision for)/release of losses | $	$ 2,285	$ (512)	$ (4,709)
Farmer Mac Guaranteed Securities | AgVantage
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, securities in unrealized loss positions	95	13
Held-to-maturity, securities in unrealized loss positions	37	10
Unrealized loss position for more than 12 months, Number of securities in loss position	13	2
Debt securities, held-to-maturity, unrealized loss position for more than 12 months, Number of securities in loss position	4,000	0