Farmer Mac Guaranteed Securities and USDA Securities - Narrative (Details) - Farmer Mac Guaranteed Securities - AgVantage - security	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, securities in unrealized loss positions	106	95
Held-to-maturity, securities in unrealized loss positions	32	37
Unrealized loss position for more than 12 months, Number of securities in loss position	57	13
Debt securities, held-to-maturity, unrealized loss position for more than 12 months, Number of securities in loss position	22,000	4