Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 56,800	$ 51,500
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	1,704,120
Due after one year through five years	3,553,450
Due after five years through ten years	1,203,613
Due after ten years	1,698,291
Available-for-sale, Amortized Cost	8,159,474
Fair Value
Due within one year	1,694,039
Due after one year through five years	3,399,931
Due after five years through ten years	1,112,712
Due after ten years	1,538,733
Total, Fair Value	$ 7,745,415
Weighted- Average Yield
Due within one year	5.02%
Due after one year through five years	3.80%
Due after five years through ten years	3.68%
Due after ten years	4.43%
Total, Weighted-Average Yield	4.16%