Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 36,400	$ 29,800
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	1,408,660
Due after one year through five years	2,540,713
Due after five years through ten years	994,839
Due after ten years	1,734,984
Debt securities, available-for-sale, amortized cost	6,679,196
Fair Value
Due within one year	1,406,146
Due after one year through five years	2,471,054
Due after five years through ten years	917,016
Due after ten years	1,655,996
Total, Fair Value	$ 6,450,212
Weighted- Average Yield
Due within one year	2.25%
Due after one year through five years	2.75%
Due after five years through ten years	2.51%
Due after ten years	2.60%
Total, Weighted-Average Yield	2.57%