FAIR VALUE DISCLOSURES - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financial assets:
Financial derivatives	$ 30,650	$ 27,789
Guarantee and commitment fees receivable	49,706	50,499
Financial liabilities:
Financial derivatives	53,697	77,326
Guarantee and commitment obligation	47,476	48,326
Fair Value
Financial assets:
Cash and cash equivalents	1,030,329	1,024,007
Loans	14,363,500	12,924,604
Financial derivatives	30,650	27,789
Guarantee and commitment fees receivable	57,129	57,562
Financial liabilities:
Notes payable	28,401,929	26,759,873
Debt securities of consolidated trusts held by third parties	2,192,102	1,910,302
Financial derivatives	53,697	77,326
Guarantee and commitment obligation	54,900	55,388
Fair Value | Investment securities
Financial assets:
Marketable securities	6,697,624	5,973,571
Fair Value | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	7,857,285	8,215,646
Fair Value | USDA Securities
Financial assets:
Marketable securities	2,203,130	2,113,342
Carrying Amount
Financial assets:
Cash and cash equivalents	1,030,329	1,024,007
Loans	14,479,983	13,204,638
Financial derivatives	30,650	27,789
Guarantee and commitment fees receivable	49,706	50,499
Financial liabilities:
Notes payable	28,843,331	27,371,174
Debt securities of consolidated trusts held by third parties	2,157,962	1,929,628
Financial derivatives	53,697	77,326
Guarantee and commitment obligation	47,476	48,326
Carrying Amount | Investment securities
Financial assets:
Marketable securities	6,697,258	5,973,301
Carrying Amount | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	7,862,498	8,232,234
Carrying Amount | USDA Securities
Financial assets:
Marketable securities	$ 2,407,198	$ 2,371,352