SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Variable Interest Entity [Line Items]
Assets	$ 36,729,246	$ 35,370,157	$ 31,803,939
Liabilities	$ 35,012,225	$ 33,651,208
Farmer Mac Guaranteed Securities
Variable Interest Entity [Line Items]
Weighted-average remaining maturity	20 years 4 months 24 days	20 years 8 months 12 days
Unconsolidated VIE \| Farmer Mac Guaranteed Securities
Variable Interest Entity [Line Items]
Max Exposure to Loss	$ 454,899	$ 466,441
Assets	85,300	85,791
Liabilities	$ 4,876	$ 5,020

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others.

+ References

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details