GUARANTEES AND COMMITMENTS - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Total
Total	$ 10,041,653		$ 10,041,653		$ 9,623,119
Agricultural Finance
Total
Current period charge-offs	4,043	$ 0	4,043	$ 0
Rural Infrastructure Finance
Year One
Total	441,378		441,378		618,946
Current period charge-offs	0	0	0	0
Year Two
Total	547,120		547,120		720,522
Current period charge-offs	0	0	0	0
Year Three
Total	684,571		684,571		187,746
Current period charge-offs	0	0	0	0
Year Four
Total	188,592		188,592		593,841
Current period charge-offs	0	0	0	0
Year Five
Total	570,283		570,283		701,937
Current period charge-offs	0	0	0	0
Prior
Total	1,272,743		1,272,743		611,548
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	274,551		274,551		100,223
Current period charge-offs	0	0	0	0
Total
Total	3,979,238		3,979,238		3,534,763
Current period charge-offs	0	0	0	0
Acceptable | Rural Infrastructure Finance
Year One
Total	441,378		441,378		618,946
Year Two
Total	547,120		547,120		681,272
Year Three
Total	649,907		649,907		187,746
Year Four
Total	188,592		188,592		593,841
Year Five
Total	570,283		570,283		701,937
Prior
Total	1,272,743		1,272,743		611,548
Revolving Loans - Amortized Cost Basis
Total	274,551		274,551		100,223
Total
Total	3,944,574		3,944,574		3,495,513
Special mention | Rural Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		9,850
Year Three
Total	34,664		34,664		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	34,664		34,664		9,850
Substandard | Rural Infrastructure Finance
Year One
Total	0		0		0
Year Two
Total	0		0		29,400
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		29,400
Long-Term Standby Purchase Commitments and Guaranteed Securities
Total
Total	3,820,746		3,820,746		3,932,857
Long-Term Standby Purchase Commitments and Guaranteed Securities | Agricultural Finance
Year One
Total	9,001		9,001		169,429
Current period charge-offs	0	0	0	0
Year Two
Total	158,446		158,446		246,512
Current period charge-offs	0	0	0	0
Year Three
Total	233,703		233,703		517,862
Current period charge-offs	0	0	0	0
Year Four
Total	494,450		494,450		535,398
Current period charge-offs	0	0	0	0
Year Five
Total	518,122		518,122		266,882
Current period charge-offs	0	0	0	0
Prior
Total	1,408,407		1,408,407		1,256,770
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	400,924		400,924		404,991
Current period charge-offs	0	0	0	0
Total
Total	3,223,053		3,223,053		3,397,844
Current period charge-offs	0	0	0	0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Rural 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	368,801		368,801		419,190
Current period charge-offs	0	0	0	0
Revolving Loans - Amortized Cost Basis
Total	228,892		228,892		115,823
Current period charge-offs	0	0	0	0
Total
Total	597,693		597,693		535,013
Current period charge-offs	0	$ 0	0	$ 0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Acceptable | Agricultural Finance
Year One
Total	9,001		9,001		169,429
Year Two
Total	158,446		158,446		246,441
Year Three
Total	228,783		228,783		515,396
Year Four
Total	478,551		478,551		534,395
Year Five
Total	515,714		515,714		264,815
Prior
Total	1,334,544		1,334,544		1,185,811
Revolving Loans - Amortized Cost Basis
Total	391,099		391,099		391,335
Total
Total	3,116,138		3,116,138		3,307,622
Long-Term Standby Purchase Commitments and Guaranteed Securities | Acceptable | Rural 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	368,801		368,801		419,190
Revolving Loans - Amortized Cost Basis
Total	228,892		228,892		115,823
Total
Total	597,693		597,693		535,013
Long-Term Standby Purchase Commitments and Guaranteed Securities | Special mention | Agricultural Finance
Year One
Total	0		0		0
Year Two
Total	0		0		71
Year Three
Total	4,920		4,920		2,466
Year Four
Total	14,717		14,717		872
Year Five
Total	2,408		2,408		531
Prior
Total	47,945		47,945		44,631
Revolving Loans - Amortized Cost Basis
Total	8,602		8,602		8,565
Total
Total	78,592		78,592		57,136
Long-Term Standby Purchase Commitments and Guaranteed Securities | Special mention | Rural 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		0
Year Four
Total	1,182		1,182		131
Year Five
Total	0		0		1,536
Prior
Total	25,918		25,918		26,328
Revolving Loans - Amortized Cost Basis
Total	1,223		1,223		5,091
Total
Total	28,323		28,323		33,086
Long-Term Standby Purchase Commitments and Guaranteed Securities | Substandard | Rural 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