FAIR VALUE DISCLOSURES - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial assets:
Financial derivatives	$ 27,789	$ 37,478
Guarantee and commitment fees receivable	50,499	49,832
Financial liabilities:
Financial derivatives	77,326	117,131
Guarantee and commitment obligation	48,326	47,563	$ 46,582	$ 43,926
Fair Value
Financial assets:
Cash and cash equivalents	1,024,007	888,707
Loans	12,924,604	10,426,021
Financial derivatives	27,789	37,478
Guarantee and commitment fees receivable	57,562	58,465
Financial liabilities:
Notes payable	26,759,873	25,670,971
Debt securities of consolidated trusts held by third parties	1,910,302	1,268,563
Financial derivatives	77,326	117,131
Guarantee and commitment obligation	55,388	56,195
Fair Value | Investment securities
Financial assets:
Marketable securities	5,973,571	4,981,249
Fair Value | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,215,646	9,710,074
Fair Value | USDA Securities
Financial assets:
Marketable securities	2,113,342	2,036,046
Carrying Amount
Financial assets:
Cash and cash equivalents	1,024,007	888,707
Loans	13,204,638	11,039,349
Financial derivatives	27,789	37,478
Guarantee and commitment fees receivable	50,499	49,832
Financial liabilities:
Notes payable	27,371,174	26,336,542
Debt securities of consolidated trusts held by third parties	1,929,628	1,351,069
Financial derivatives	77,326	117,131
Guarantee and commitment obligation	48,326	47,563
Carrying Amount | Investment securities
Financial assets:
Marketable securities	5,973,301	4,979,504
Carrying Amount | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,232,234	9,745,548
Carrying Amount | USDA Securities
Financial assets:
Marketable securities	$ 2,371,352	$ 2,355,412