GUARANTEES AND COMMITMENTS - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Total
Total	$ 12,226,915		$ 12,226,915		$ 11,183,408
Agricultural Finance
Total
Current period charge-offs	2,840	$ 4,043	2,840	$ 4,043
Infrastructure Finance
Year One
Total	587,381		587,381		1,158,427
Current period charge-offs	0	0	0	0
Year Two
Total	1,256,486		1,256,486		534,499
Current period charge-offs	0	0	0	0
Year Three
Total	603,926		603,926		642,402
Current period charge-offs	0	0	0	0
Year Four
Total	637,172		637,172		174,232
Current period charge-offs	0	0	0	0
Year Five
Total	181,651		181,651		574,135
Current period charge-offs	0	0	0	0
Prior
Total	1,730,271		1,730,271		1,229,626
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	487,769		487,769		461,162
Current period charge-offs	0	0	0	0
Total
Total	5,484,656		5,484,656		4,774,483
Current period charge-offs	0	0	0	0
Acceptable | Infrastructure Finance
Year One
Total	587,381		587,381		1,158,427
Year Two
Total	1,256,486		1,256,486		521,143
Year Three
Total	578,282		578,282		578,882
Year Four
Total	580,908		580,908		174,232
Year Five
Total	181,651		181,651		574,135
Prior
Total	1,730,271		1,730,271		1,229,626
Revolving Loans - Amortized Cost Basis
Total	487,769		487,769		461,162
Total
Total	5,402,748		5,402,748		4,697,607
Special mention | Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		0
Year Three
Total	0		0		34,388
Year Four
Total	9,699		9,699		0
Year Five
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans - Amortized Cost Basis
Total	0		0		0
Total
Total	9,699		9,699		34,388
Substandard | Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		13,356
Year Three
Total	25,644		25,644		29,132
Year Four
Total	46,565		46,565		0
Year Five
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans - Amortized Cost Basis
Total	0		0		0
Total
Total	72,209		72,209		42,488
Long-Term Standby Purchase Commitments and Guaranteed Securities
Total
Total	4,634,352		4,634,352		4,267,519
Long-Term Standby Purchase Commitments and Guaranteed Securities | Agricultural Finance
Year One
Total	36,634		36,634		70,757
Current period charge-offs	0	0	0	0
Year Two
Total	87,943		87,943		169,609
Current period charge-offs	0	0	0	0
Year Three
Total	169,964		169,964		273,717
Current period charge-offs	0	0	0	0
Year Four
Total	267,236		267,236		580,836
Current period charge-offs	0	0	0	0
Year Five
Total	570,045		570,045		594,297
Current period charge-offs	0	0	0	0
Prior
Total	1,880,137		1,880,137		1,379,249
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	468,067		468,067		466,323
Current period charge-offs	0	0	0	0
Total
Total	3,480,026		3,480,026		3,534,788
Current period charge-offs	0	0	0	0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Infrastructure Finance
Year One
Total	0		0		0
Current period charge-offs	0	0	0	0
Year Two
Total	0		0		0
Current period charge-offs	0	0	0	0
Year Three
Total	0		0		0
Current period charge-offs	0	0	0	0
Year Four
Total	0		0		0
Current period charge-offs	0	0	0	0
Year Five
Total	0		0		0
Current period charge-offs	0	0	0	0
Prior
Total	342,546		342,546		355,848
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	811,780		811,780		376,883
Current period charge-offs	0	0	0	0
Total
Total	1,154,326		1,154,326		732,731
Current period charge-offs	0	$ 0	0	$ 0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Acceptable | Agricultural Finance
Year One
Total	36,634		36,634		70,757
Year Two
Total	87,943		87,943		163,646
Year Three
Total	162,125		162,125		267,551
Year Four
Total	246,485		246,485		563,747
Year Five
Total	548,374		548,374		583,598
Prior
Total	1,813,260		1,813,260		1,312,988
Revolving Loans - Amortized Cost Basis
Total	455,175		455,175		452,909
Total
Total	3,349,996		3,349,996		3,415,196
Long-Term Standby Purchase Commitments and Guaranteed Securities | Acceptable | Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		0
Year Three
Total	0		0		0
Year Four
Total	0		0		0
Year Five
Total	0		0		0
Prior
Total	342,546		342,546		355,848
Revolving Loans - Amortized Cost Basis
Total	809,740		809,740		376,883
Total
Total	1,152,286		1,152,286		732,731
Long-Term Standby Purchase Commitments and Guaranteed Securities | Special mention | Agricultural Finance
Year One
Total	0		0		0
Year Two
Total	0		0		5,963
Year Three
Total	7,839		7,839		4,920
Year Four
Total	20,751		20,751		15,954
Year Five
Total	7,589		7,589		4,354
Prior
Total	43,494		43,494		44,964
Revolving Loans - Amortized Cost Basis
Total	12,572		12,572		12,197
Total
Total	92,245		92,245		88,352
Long-Term Standby Purchase Commitments and Guaranteed Securities | Special mention | Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		0
Year Three
Total	0		0		0
Year Four
Total	0		0		0
Year Five
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans - Amortized Cost Basis
Total	0		0		0
Total
Total	0		0		0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Substandard | Agricultural Finance
Year One
Total	0		0		0
Year Two
Total	0		0		0
Year Three
Total	0		0		1,246
Year Four
Total	0		0		1,135
Year Five
Total	14,082		14,082		6,345
Prior
Total	23,383		23,383		21,297
Revolving Loans - Amortized Cost Basis
Total	320		320		1,217
Total
Total	37,785		37,785		31,240
Long-Term Standby Purchase Commitments and Guaranteed Securities | Substandard | Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		0
Year Three
Total	0		0		0
Year Four
Total	0		0		0
Year Five
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans - Amortized Cost Basis
Total	2,040		2,040		0
Total
Total	$ 2,040		$ 2,040		$ 0