Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 35,800	$ 29,800
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	1,231,599
Due after one year through five years	2,420,343
Due after five years through ten years	1,276,934
Due after ten years	1,744,018
Debt securities, available-for-sale, amortized cost	6,672,894
Fair Value
Due within one year	1,233,753
Due after one year through five years	2,390,586
Due after five years through ten years	1,248,573
Due after ten years	1,727,334
Total, Fair Value	$ 6,600,246
Weighted- Average Yield
Due within one year	2.05%
Due after one year through five years	2.52%
Due after five years through ten years	2.55%
Due after ten years	2.63%
Total, Weighted-Average Yield	2.46%