Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 63,600	$ 51,500
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	2,243,310
Due after one year through five years	3,366,125
Due after five years through ten years	1,248,415
Due after ten years	1,707,478
Debt securities, available-for-sale, amortized cost	8,565,328
Fair Value
Due within one year	2,239,632
Due after one year through five years	3,248,962
Due after five years through ten years	1,174,976
Due after ten years	1,561,884
Total, Fair Value	$ 8,225,454
Weighted- Average Yield
Due within one year	4.69%
Due after one year through five years	3.59%
Due after five years through ten years	3.61%
Due after ten years	4.23%
Total, Weighted-Average Yield	4.00%