Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 51,500	$ 29,800
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	1,675,756
Due after one year through five years	3,295,169
Due after five years through ten years	1,331,931
Due after ten years	1,716,639
Debt securities, available-for-sale, amortized cost	8,019,495
Fair Value
Due within one year	1,670,398
Due after one year through five years	3,149,966
Due after five years through ten years	1,230,818
Due after ten years	1,556,044
Total, Fair Value	$ 7,607,226
Weighted- Average Yield
Due within one year	4.27%
Due after one year through five years	3.49%
Due after five years through ten years	3.50%
Due after ten years	4.12%
Total, Weighted-Average Yield	3.78%