FAIR VALUE DISCLOSURES - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets:
Financial derivatives	$ 49,197	$ 37,478
Guarantee and commitment fees receivable	46,077	49,832
Financial liabilities:
Financial derivatives	64,351	117,131
Guarantee and commitment obligation	43,939	47,563
Fair Value
Financial assets:
Cash and cash equivalents	842,056	888,707
Loans	11,974,136	10,426,021
Financial derivatives	49,197	37,478
Guarantee and commitment fees receivable	53,624	58,465
Financial liabilities:
Notes payable	26,673,965	25,670,971
Debt securities of consolidated trusts held by third parties	1,607,791	1,268,563
Financial derivatives	64,351	117,131
Guarantee and commitment obligation	51,486	56,195
Fair Value | Investment securities
Financial assets:
Marketable securities	5,896,066	4,981,249
Fair Value | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,706,073	9,710,074
Fair Value | USDA Securities
Financial assets:
Marketable securities	2,112,084	2,036,046
Carrying Amount
Financial assets:
Cash and cash equivalents	842,056	888,707
Loans	12,367,333	11,039,349
Financial derivatives	49,197	37,478
Guarantee and commitment fees receivable	46,077	49,832
Financial liabilities:
Notes payable	27,129,456	26,336,542
Debt securities of consolidated trusts held by third parties	1,616,513	1,351,069
Financial derivatives	64,351	117,131
Guarantee and commitment obligation	43,939	47,563
Carrying Amount | Investment securities
Financial assets:
Marketable securities	5,895,793	4,979,504
Carrying Amount | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	8,722,762	9,745,548
Carrying Amount | USDA Securities
Financial assets:
Marketable securities	$ 2,344,715	$ 2,355,412