SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Variable Interest Entity [Line Items]
Carrying Value of Assets	$ 39,290,192	$ 35,370,157	$ 32,995,909
Carrying Value of Liabilities	$ 37,435,758	$ 33,651,208
Farmer Mac Guaranteed Securities
Variable Interest Entity [Line Items]
Weighted-average remaining maturity	20 years 1 month 6 days	20 years 8 months 12 days
Unconsolidated VIE | Farmer Mac Guaranteed Securities
Variable Interest Entity [Line Items]
Max Exposure to Loss	$ 453,642	$ 466,441
Carrying Value of Assets	89,367	85,791
Carrying Value of Liabilities	$ 4,808	$ 5,020