Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
AgVantage
Weighted- Average Yield
Held-to-maturity, accrued interest excluded	$ 41,100	$ 42,100
Farmer Mac Guaranteed Securities and USDA Securities
Amortized Cost
Due within one year	613,850
Due after one year through five years	727,249
Due after five years through ten years	266,980
Due after ten years	2,148,654
Total	3,756,733
Fair Value
Due within one year	606,761
Due after one year through five years	664,058
Due after five years through ten years	227,512
Due after ten years	1,797,978
Total	$ 3,296,309
Weighted- Average Yield
Due within one year	2.17%
Due after one year through five years	1.97%
Due after five years through ten years	3.06%
Due after ten years	3.25%
Total	2.79%