FARMER MAC GUARANTEED SECURITIES AND USDA SECURITIES - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
AgVantage
Weighted- Average Yield
Available-for-sale, accrued interest excluded	$ 60,300	$ 57,500
Farmer Mac Guaranteed Securities
Amortized Cost
Due within one year	755,000
Due after one year through five years	3,312,473
Due after five years through ten years	1,041,694
Due after ten years	933,622
Available-for-sale, amortized cost	6,042,789	5,835,658
Fair Value
Due within one year	753,819
Due after one year through five years	3,282,253
Due after five years through ten years	972,023
Due after ten years	846,003
Total fair value	$ 5,854,098	5,514,546
Weighted- Average Yield
Due within one year	4.37%
Due after one year through five years	3.81%
Due after five years through ten years	3.51%
Due after ten years	3.99%
Weighted-average yield	3.85%
Farmer Mac Guaranteed Securities | AgVantage
Amortized Cost
Available-for-sale, amortized cost	$ 6,034,583	5,826,948
Fair Value
Total fair value	$ 5,845,642	$ 5,505,531