Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
AgVantage
Weighted- Average Yield
Held-to-maturity, accrued interest excluded	$ 58,900	$ 44,400
Farmer Mac Guaranteed Securities and USDA Securities
Amortized Cost
Due within one year	2,071,858
Due after one year through five years	1,321,681
Due after five years through ten years	453,755
Due after ten years	2,632,671
Total, Amortized Cost	6,479,965
Fair Value
Due within one year	2,066,836
Due after one year through five years	1,269,796
Due after five years through ten years	409,148
Due after ten years	2,297,803
Total, Fair Value	$ 6,043,583
Weighted- Average Yield
Due within one year	5.61%
Due after one year through five years	4.22%
Due after five years through ten years	4.30%
Due after ten years	4.19%
Total, Weighted- Average Yield	4.68%