FINANCIAL DERIVATIVES - Schedule of Net Income/(Expense) Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Investments and cash equivalents	$ 83,308	$ 84,924
Interest Income Loans	171,764	144,580
Total Interest Expense	(290,475)	(309,949)
(Losses)/gains on financial derivatives	(2,636)	2,079
Interest expense on interest rate swaps	3,380	7,314
Designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Investments and cash equivalents	83,308	84,924
Interest Income Farmer Mac Guaranteed Securities and USDA Securities	126,342	166,813
Interest Income Loans	171,764	144,580
Total Interest Expense	(290,475)	(309,949)
(Losses)/gains on financial derivatives	(2,636)	2,079
Total	88,303	88,447
Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(15,909)	(28,182)
Premium/discount amortization recognized on hedged items	(229)	(302)
Recognized on hedged items	86,547	(99,836)
(Losses)/gains on fair value hedging relationships	1,099	3,002
Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	(14)
Interest settlements reclassified from AOCI into net income on derivatives	3,825	5,431
Recognized on hedged items	(6,345)	(8,091)
Expense recognized on cash flow hedges	(2,520)	(2,674)
No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	(2,636)	2,079
Interest Income Investments and Cash Equivalents | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	13,130	9,948
Premium/discount amortization recognized on hedged items	431	445
Recognized on hedged items	33,978	(27,521)
(Losses)/gains on fair value hedging relationships	(31)	268
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
Interest settlements reclassified from AOCI into net income on derivatives	0	0
Recognized on hedged items	0	0
Expense recognized on cash flow hedges	0	0
Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	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	55,871	51,705
Premium/discount amortization recognized on hedged items	0	0
Recognized on hedged items	82,017	(80,743)
(Losses)/gains on fair value hedging relationships	(468)	843
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
Interest settlements reclassified from AOCI into net income on derivatives	0	0
Recognized on hedged items	0	0
Expense recognized on cash flow hedges	0	0
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Interest Income Loans | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	18,968	16,598
Premium/discount amortization recognized on hedged items	0	0
Recognized on hedged items	44,981	(47,061)
(Losses)/gains on fair value hedging relationships	427	1,119
Interest Income Loans | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0
Recognized on hedged items	0	0
Expense recognized on cash flow hedges	0	0
Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Total Interest Expense | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	(103,878)	(106,433)
Premium/discount amortization recognized on hedged items	(660)	(747)
Recognized on hedged items	(74,429)	55,489
(Losses)/gains on fair value hedging relationships	1,171	772
Total Interest Expense | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	(14)
Interest settlements reclassified from AOCI into net income on derivatives	3,825	5,431
Recognized on hedged items	(6,345)	(8,091)
Expense recognized on cash flow hedges	(2,520)	(2,674)
Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Losses on financial derivatives | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on hedged items	0	0
Premium/discount amortization recognized on hedged items	0	0
Recognized on hedged items	0	0
(Losses)/gains on fair value hedging relationships	0	0
Losses on financial derivatives | Designated as hedge | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Premium/discount amortization recognized on hedged items	0	0
Interest settlements reclassified from AOCI into net income on derivatives	0	0
Recognized on hedged items	0	0
Expense recognized on cash flow hedges	0	0
Losses on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	(2,636)	2,079
Interest Rate Swap | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	13,036	(15,073)
Income/(expense) related to interest settlements on fair value hedging relationships	(3,102)	(43,557)
Recognized on derivatives	(85,448)	102,838
Interest Rate Swap | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	(2,703)	754
Interest expense on interest rate swaps	318	(34)
Interest Rate Swap | Interest Income Investments and Cash Equivalents | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	7,085	10,297
Income/(expense) related to interest settlements on fair value hedging relationships	20,646	20,690
Recognized on derivatives	(34,009)	27,789
Interest Rate Swap | Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Interest expense on interest rate swaps	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	22,059	40,332
Income/(expense) related to interest settlements on fair value hedging relationships	77,930	92,037
Recognized on derivatives	(82,485)	81,586
Interest Rate Swap | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Interest expense on interest rate swaps	0	0
Interest Rate Swap | Interest Income Loans | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	12,386	17,849
Income/(expense) related to interest settlements on fair value hedging relationships	31,354	34,447
Recognized on derivatives	(44,554)	48,180
Interest Rate Swap | Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Interest expense on interest rate swaps	0	0
Interest Rate Swap | Total Interest Expense | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	(28,494)	(83,551)
Income/(expense) related to interest settlements on fair value hedging relationships	(133,032)	(190,731)
Recognized on derivatives	75,600	(54,717)
Interest Rate Swap | Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Interest expense on interest rate swaps	0	0
Interest Rate Swap | Losses on financial derivatives | Designated as hedge | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	0	0
Income/(expense) related to interest settlements on fair value hedging relationships	0	0
Recognized on derivatives	0	0
Interest Rate Swap | Losses on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	(2,703)	754
Interest expense on interest rate swaps	318	(34)
Treasury futures | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	(251)	1,359
Treasury futures | Interest Income Investments and Cash Equivalents | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Treasury futures | Interest Income Farmer Mac Guaranteed Securities and USDA Securities | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Treasury futures | Interest Income Loans | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Treasury futures | Total Interest Expense | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	0	0
Treasury futures | Losses on financial derivatives | No hedge designation
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains on financial derivatives	$ (251)	$ 1,359