FINANCIAL DERIVATIVES - Schedule of Net Income/(Expense) Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income Investments and Cash Equivalents	$ 88,985	$ 84,538	$ 172,293	$ 169,462
Interest Income Loans	185,039	153,105	356,803	297,685
Total Interest Expense	(302,225)	(316,366)	(592,700)	(626,315)
Gains (losses) on financial derivatives	80	(1,799)	(2,556)	280
Interest expense on interest rate swaps	5,837	2,526	9,217	9,840
Designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income Investments and Cash Equivalents	88,985	84,538	172,293	169,462
Interest Income Farmer Mac Guaranteed Securities and USDA Securities	124,998	166,063	251,340	332,876
Interest Income Loans	185,039	153,105	356,803	297,685
Total Interest Expense	(302,225)	(316,366)	(592,700)	(626,315)
Gains (losses) on financial derivatives	80	(1,799)	(2,556)	280
Total	96,877	85,541	185,180	173,988
Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(9,809)	(27,625)	(25,718)	(55,808)
Premium/discount amortization recognized on hedged items	73	(234)	(156)	(535)
Gains/(losses) on fair value hedging relationships, recognized on hedged items	25,239	(51,842)	111,787	(151,678)
Gains/(losses) on fair value hedging relationships	2,709	2,604	3,808	5,606
Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	(38)	(14)	(38)	(27)
Interest settlements reclassified from AOCI into net income on derivatives	3,746	5,393	7,571	10,824
Recognized on hedged items	(6,108)	(8,014)	(12,453)	(16,105)
Expense recognized on cash flow hedges	(2,400)	(2,635)	(4,920)	(5,308)
Designated as hedge | Interest Income Investments and Cash Equivalents | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	14,101	10,309	27,231	20,257
Premium/discount amortization recognized on hedged items	796	487	1,227	933
Gains/(losses) on fair value hedging relationships, recognized on hedged items	19,271	(3,361)	53,249	(30,882)
Gains/(losses) on fair value hedging relationships	11	99	(20)	368
Designated as hedge | Interest Income Investments and Cash Equivalents | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Expense recognized on cash flow hedges	0	0	0	0
Designated as hedge | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	56,672	52,651	112,543	104,356
Premium/discount amortization recognized on hedged items	0	0	0	0
Gains/(losses) on fair value hedging relationships, recognized on hedged items	37,769	(6,508)	119,787	(87,251)
Gains/(losses) on fair value hedging relationships	293	418	(175)	1,261
Designated as hedge | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Expense recognized on cash flow hedges	0	0	0	0
Designated as hedge | Interest Income Loans | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	19,633	16,705	38,601	33,302
Premium/discount amortization recognized on hedged items	0	0	0	0
Gains/(losses) on fair value hedging relationships, recognized on hedged items	8,860	(12,112)	53,840	(59,173)
Gains/(losses) on fair value hedging relationships	833	1,076	1,259	2,195
Designated as hedge | Interest Income Loans | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Expense recognized on cash flow hedges	0	0	0	0
Designated as hedge | Total Interest Expense | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(100,215)	(107,290)	(204,093)	(213,723)
Premium/discount amortization recognized on hedged items	(723)	(721)	(1,383)	(1,468)
Gains/(losses) on fair value hedging relationships, recognized on hedged items	(40,661)	(29,861)	(115,089)	25,628
Gains/(losses) on fair value hedging relationships	1,572	1,011	2,744	1,782
Designated as hedge | Total Interest Expense | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	(38)	(14)	(38)	(27)
Interest settlements reclassified from AOCI into net income on derivatives	3,746	5,393	7,571	10,824
Recognized on hedged items	(6,108)	(8,014)	(12,453)	(16,105)
Expense recognized on cash flow hedges	(2,400)	(2,635)	(4,920)	(5,308)
Designated as hedge | Losses on financial derivatives | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	0	0	0	0
Premium/discount amortization recognized on hedged items	0	0	0	0
Gains/(losses) on fair value hedging relationships, recognized on hedged items	0	0	0	0
Gains/(losses) on fair value hedging relationships	0	0	0	0
Designated as hedge | Losses on financial derivatives | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Expense recognized on cash flow hedges	0	0	0	0
Designated as hedge | Interest Rate Swap | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	13,730	(9,290)	26,764	(24,362)
Income/(expense) related to interest settlements on fair value hedging relationships	3,994	(37,149)	890	(80,705)
Gains/(losses) on fair value hedging relationships, recognized on derivatives	(22,530)	54,446	(107,979)	157,284
Designated as hedge | Interest Rate Swap | Interest Income Investments and Cash Equivalents | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	7,261	10,408	14,346	20,705
Income/(expense) related to interest settlements on fair value hedging relationships	22,158	21,204	42,804	41,895
Gains/(losses) on fair value hedging relationships, recognized on derivatives	(19,260)	3,460	(53,269)	31,250
Designated as hedge | Interest Rate Swap | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	21,746	39,134	43,805	79,467
Income/(expense) related to interest settlements on fair value hedging relationships	78,418	91,785	156,348	183,823
Gains/(losses) on fair value hedging relationships, recognized on derivatives	(37,476)	6,926	(119,962)	88,512
Designated as hedge | Interest Rate Swap | Interest Income Loans | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	12,499	17,827	24,883	35,676
Income/(expense) related to interest settlements on fair value hedging relationships	32,132	34,532	63,484	68,978
Gains/(losses) on fair value hedging relationships, recognized on derivatives	(8,027)	13,188	(52,581)	61,368
Designated as hedge | Interest Rate Swap | Total Interest Expense | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	(27,776)	(76,659)	(56,270)	(160,210)
Income/(expense) related to interest settlements on fair value hedging relationships	(128,714)	(184,670)	(261,746)	(375,401)
Gains/(losses) on fair value hedging relationships, recognized on derivatives	42,233	30,872	117,833	(23,846)
Designated as hedge | Interest Rate Swap | Losses on financial derivatives | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	0	0	0	0
Income/(expense) related to interest settlements on fair value hedging relationships	0	0	0	0
Gains/(losses) on fair value hedging relationships, recognized on derivatives	0	0	0	0
No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	80	(1,799)	(2,556)	280
No hedge designation | Interest Income Investments and Cash Equivalents
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Interest Income Farmer Mac Guaranteed Securities and USDA Securities
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Interest Income Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Total Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Losses on financial derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	80	(1,799)	(2,556)	280
No hedge designation | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	(834)	(26)	(3,537)	729
Interest expense on interest rate swaps	(208)	(486)	110	(521)
No hedge designation | Interest Rate Swap | Interest Income Investments and Cash Equivalents
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
Interest expense on interest rate swaps	0	0	0	0
No hedge designation | Interest Rate Swap | Interest Income Farmer Mac Guaranteed Securities and USDA Securities
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
Interest expense on interest rate swaps	0	0	0	0
No hedge designation | Interest Rate Swap | Interest Income Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
Interest expense on interest rate swaps	0	0	0	0
No hedge designation | Interest Rate Swap | Total Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
Interest expense on interest rate swaps	0	0	0	0
No hedge designation | Interest Rate Swap | Losses on financial derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	(834)	(26)	(3,537)	729
Interest expense on interest rate swaps	(208)	(486)	110	(521)
No hedge designation | Treasury futures
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	1,122	(1,287)	871	72
No hedge designation | Treasury futures | Interest Income Investments and Cash Equivalents
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Treasury futures | Interest Income Farmer Mac Guaranteed Securities and USDA Securities
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Treasury futures | Interest Income Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Treasury futures | Total Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	0	0	0	0
No hedge designation | Treasury futures | Losses on financial derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on financial derivatives	$ 1,122	$ (1,287)	$ 871	$ 72