FAIR VALUE DISCLOSURES - Schedule of Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Income	Net Income	Net Income
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 5,558,633	$ 7,632,487	$ 6,358,451
Purchases	677,400	2,084,650	3,411,665
Settlements	(667,961)	(1,563,860)	(1,531,464)
Allowance for Losses	81	236	(264)
Realized and unrealized gains (losses) included in Income	(49,813)	91,607	(553,825)
Unrealized gains/(losses) included in Other Comprehensive Income	21,882	(2,391)	(52,076)
Transfers Out		(2,684,096)
Ending Balance	5,540,222	5,558,633	7,632,487
Available-for-sale securities | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	19,082	19,027	19,254
Purchases	0	0	0
Settlements	0	0	0
Allowance for Losses	0	6	19
Realized and unrealized gains (losses) included in Income	0	0	0
Unrealized gains/(losses) included in Other Comprehensive Income	394	49	(246)
Transfers Out		0
Ending Balance	19,476	19,082	19,027
Floating rate auction-rate certificates backed by Government guaranteed student loans | Floating interest rate | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	19,082	19,027	19,254
Purchases	0	0	0
Settlements	0	0	0
Allowance for Losses	0	6	19
Realized and unrealized gains (losses) included in Income	0	0	0
Unrealized gains/(losses) included in Other Comprehensive Income	394	49	(246)
Transfers Out		0
Ending Balance	19,476	19,082	19,027
Farmer Mac Guaranteed Securities | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,532,479	7,607,226	6,328,559
Purchases	677,400	2,084,650	3,411,665
Settlements	(667,175)	(1,562,720)	(1,527,978)
Allowance for Losses	81	230	(283)
Realized and unrealized gains (losses) included in Income	(49,727)	89,629	(552,907)
Unrealized gains/(losses) included in Other Comprehensive Income	21,488	(2,440)	(51,830)
Transfers Out		(2,684,096)
Ending Balance	5,514,546	5,532,479	7,607,226
Farmer Mac Guaranteed Securities | Level 3 | Recurring | AgVantage
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,522,712	7,599,379	6,316,145
Purchases	677,400	2,084,650	3,411,665
Settlements	(666,476)	(1,561,507)	(1,526,303)
Allowance for Losses	81	230	(283)
Realized and unrealized gains (losses) included in Income	(49,727)	89,629	(552,907)
Unrealized gains/(losses) included in Other Comprehensive Income	21,541	(5,573)	(48,938)
Transfers Out		(2,684,096)
Ending Balance	5,505,531	5,522,712	7,599,379
Farmer Mac Guaranteed Securities | Level 3 | Recurring | Farmer Mac Guaranteed USDA Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	9,767	7,847	12,414
Purchases	0	0	0
Settlements	(699)	(1,213)	(1,675)
Allowance for Losses	0	0	0
Realized and unrealized gains (losses) included in Income	0	0	0
Unrealized gains/(losses) included in Other Comprehensive Income	(53)	3,133	(2,892)
Transfers Out		0
Ending Balance	9,015	9,767	7,847
USDA Securities | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,241	1,767	4,401
Purchases	0	0	0
Settlements	(443)	(550)	(2,583)
Allowance for Losses	0	0	0
Realized and unrealized gains (losses) included in Income	20	24	(51)
Unrealized gains/(losses) included in Other Comprehensive Income	0	0	0
Transfers Out		0
Ending Balance	818	1,241	1,767
Guarantee and commitment obligations: | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,831	4,467	6,237
Purchases	0	0	0
Settlements	(343)	(590)	(903)
Allowance for Losses	0	0	0
Realized and unrealized gains (losses) included in Income	(106)	1,954	(867)
Unrealized gains/(losses) included in Other Comprehensive Income	0	0	0
Transfers Out		0
Ending Balance	5,382	5,831	4,467
Guarantee and commitment obligations: | Level 3 | Recurring | Guarantee Asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,831	4,467	6,237
Purchases	0	0	0
Settlements	(343)	(590)	(903)
Allowance for Losses	0	0	0
Realized and unrealized gains (losses) included in Income	(106)	1,954	(867)
Unrealized gains/(losses) included in Other Comprehensive Income	0	0	0
Transfers Out		0
Ending Balance	$ 5,382	$ 5,831	$ 4,467