Farmer Mac Guaranteed Securities and USDA Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
AgVantage
Weighted- Average Yield
Held-to-maturity, accrued interest excluded	$ 33,600	$ 44,400
Farmer Mac Guaranteed Securities and USDA Securities
Amortized Cost
Due within one year	288,106
Due after one year through five years	570,623
Due after five years through ten years	298,239
Due after ten years	2,029,136
Total, Amortized Cost	3,186,104
Fair Value
Due within one year	282,871
Due after one year through five years	523,236
Due after five years through ten years	266,808
Due after ten years	1,792,212
Total, Fair Value	$ 2,865,127
Weighted- Average Yield
Due within one year	2.77%
Due after one year through five years	2.20%
Due after five years through ten years	3.42%
Due after ten years	3.39%
Total, Weighted- Average Yield	3.10%