FAIR VALUE DISCLOSURES - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets:
Financial derivatives	$ 27,867	$ 27,789
Guarantee and commitment fees receivable	49,888	50,499
Financial liabilities:
Financial derivatives	63,389	77,326
Guarantee and commitment obligation	47,679	48,326
Fair Value
Financial assets:
Cash and cash equivalents	1,048,135	1,024,007
Loans	13,476,915	12,924,604
Financial derivatives	27,867	27,789
Guarantee and commitment fees receivable	56,159	57,562
Financial liabilities:
Notes payable	27,479,303	26,759,873
Debt securities of consolidated trusts held by third parties	1,911,578	1,910,302
Financial derivatives	63,389	77,326
Guarantee and commitment obligation	53,950	55,388
Fair Value | Investment securities
Financial assets:
Marketable securities	6,252,795	5,973,571
Fair Value | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,069,599	8,215,646
Fair Value | USDA Securities
Financial assets:
Marketable securities	2,172,063	2,113,342
Carrying Amount
Financial assets:
Cash and cash equivalents	1,048,135	1,024,007
Loans	13,623,484	13,204,638
Financial derivatives	27,867	27,789
Guarantee and commitment fees receivable	49,888	50,499
Financial liabilities:
Notes payable	27,975,196	27,371,174
Debt securities of consolidated trusts held by third parties	1,894,920	1,929,628
Financial derivatives	63,389	77,326
Guarantee and commitment obligation	47,679	48,326
Carrying Amount | Investment securities
Financial assets:
Marketable securities	6,252,486	5,973,301
Carrying Amount | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,074,791	8,232,234
Carrying Amount | USDA Securities
Financial assets:
Marketable securities	$ 2,377,341	$ 2,371,352