FINANCIAL DERIVATIVES - Schedule of Net Income/(Expense) Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Investments and cash equivalents	$ 345,501	$ 287,144	$ 82,659
Interest Income Loans	629,187	514,894	350,420
Total Interest Expense	(1,249,649)	(1,064,741)	(445,908)
Gains on financial derivatives	2,636	2,882	22,631
Interest expense on interest rate swaps	21,397	23,511	38,688
Designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Investments and cash equivalents	345,501	287,144	82,659
Interest Income Farmer Mac Guaranteed Securities and USDA Securities	628,828	590,250	283,769
Interest Income Loans	629,187	514,894	350,420
Total Interest Expense	(1,249,649)	(1,064,741)	(445,908)
Gains on financial derivatives	2,636	2,882	22,631
Total	356,503	330,429	293,571
Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(95,850)	(61,506)	82,743
Premium/discount amortization recognized on hedged items	(1,063)	(1,005)	(2,870)
Recognized on hedged items	(246,695)	(151,073)	(514,121)
Gains/(losses) on fair value hedging relationships	11,548	(5,394)	5,802
Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	(34)	(55)	(57)
Interest settlements reclassified from AOCI into net income on derivatives	20,657	20,643	1,213
Recognized on hedged items	(31,241)	(31,610)	(12,847)
Expense recognized on cash flow hedges	(10,618)	(11,022)	(11,691)
No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	2,636	2,882	22,631
Interest Income Investments and Cash Equivalents | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	44,303	33,488	16,199
Premium/discount amortization recognized on hedged items	2,134	1,860	(754)
Recognized on hedged items	(28,502)	18,472	(105,889)
Gains/(losses) on fair value hedging relationships	679	(973)	(1,167)
Interest Income Investments and Cash Equivalents | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0
Recognized on hedged items	0	0	0
Expense recognized on cash flow hedges	0	0	0
Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	213,759	183,396	142,809
Premium/discount amortization recognized on hedged items	0	0	0
Recognized on hedged items	(49,922)	89,437	(553,393)
Gains/(losses) on fair value hedging relationships	2,572	(1,714)	137
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0
Recognized on hedged items	0	0	0
Expense recognized on cash flow hedges	0	0	0
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest Income Loans | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	69,516	63,133	56,141
Premium/discount amortization recognized on hedged items	0	0	0
Recognized on hedged items	(66,852)	21,686	(341,162)
Gains/(losses) on fair value hedging relationships	4,361	(1,842)	9,954
Interest Income Loans | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0
Recognized on hedged items	0	0	0
Expense recognized on cash flow hedges	0	0	0
Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Total Interest Expense | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(423,428)	(341,523)	(132,406)
Premium/discount amortization recognized on hedged items	(3,197)	(2,865)	(2,116)
Recognized on hedged items	(101,419)	(280,668)	486,323
Gains/(losses) on fair value hedging relationships	3,936	(865)	(3,122)
Total Interest Expense | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	(34)	(55)	(57)
Interest settlements reclassified from AOCI into net income on derivatives	20,657	20,643	1,213
Recognized on hedged items	(31,241)	(31,610)	(12,847)
Expense recognized on cash flow hedges	(10,618)	(11,022)	(11,691)
Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Gains on financial derivatives | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	0	0	0
Premium/discount amortization recognized on hedged items	0	0	0
Recognized on hedged items	0	0	0
Gains/(losses) on fair value hedging relationships	0	0	0
Gains on financial derivatives | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0	0
Recognized on hedged items	0	0	0
Expense recognized on cash flow hedges	0	0	0
Gains on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	2,636	2,882	22,631
Interest Rate Swap | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	(18,895)	(99,800)	(79,201)
Income/(expense) related to interest settlements on fair value hedging relationships	(115,808)	(162,311)	672
Recognized on derivatives	258,243	145,679	519,923
Interest Rate Swap | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	2,424	4,395	13,012
Interest expense on interest rate swaps	(1,377)	(4,845)	(7,619)
Interest Rate Swap | Interest Income Investments and Cash Equivalents | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	40,224	35,377	2,727
Income/(expense) related to interest settlements on fair value hedging relationships	86,661	70,725	18,172
Recognized on derivatives	29,181	(19,445)	104,722
Interest Rate Swap | Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest expense on interest rate swaps	0	0	0
Interest Rate Swap | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	147,922	146,027	(19,486)
Income/(expense) related to interest settlements on fair value hedging relationships	361,681	329,423	123,323
Recognized on derivatives	52,494	(91,151)	553,530
Interest Rate Swap | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest expense on interest rate swaps	0	0	0
Interest Rate Swap | Interest Income Loans | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	68,346	64,648	(501)
Income/(expense) related to interest settlements on fair value hedging relationships	137,862	127,781	55,640
Recognized on derivatives	71,213	(23,528)	351,116
Interest Rate Swap | Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest expense on interest rate swaps	0	0	0
Interest Rate Swap | Total Interest Expense | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	(275,387)	(345,852)	(61,941)
Income/(expense) related to interest settlements on fair value hedging relationships	(702,012)	(690,240)	(196,463)
Recognized on derivatives	105,355	279,803	(489,445)
Interest Rate Swap | Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Interest expense on interest rate swaps	0	0	0
Interest Rate Swap | Gains on financial derivatives | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	0	0	0
Income/(expense) related to interest settlements on fair value hedging relationships	0	0	0
Recognized on derivatives	0	0	0
Interest Rate Swap | Gains on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	2,424	4,395	13,012
Interest expense on interest rate swaps	(1,377)	(4,845)	(7,619)
Treasury futures | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	1,589	3,332	17,238
Treasury futures | Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Treasury futures | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Treasury futures | Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Treasury futures | Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	0	0	0
Treasury futures | Gains on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
Gains on financial derivatives	$ 1,589	$ 3,332	$ 17,238