GUARANTEES AND COMMITMENTS - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Total
Total	$ 9,837,962		$ 9,623,119
Agricultural Finance
Total
Current period charge-offs	0	$ 0
Rural Infrastructure Finance
Year One
Total	192,160		618,946
Current period charge-offs	0	0
Year Two
Total	572,095		720,522
Current period charge-offs	0	0
Year Three
Total	700,374		187,746
Current period charge-offs	0	0
Year Four
Total	189,652		593,841
Current period charge-offs	0	0
Year Five
Total	585,661		701,937
Current period charge-offs	0	0
Prior
Total	1,283,649		611,548
Current period charge-offs	0	0
Revolving Loans - Amortized Cost Basis
Total	163,162		100,223
Current period charge-offs	0	0
Total
Total	3,686,753		3,534,763
Current period charge-offs	0	0
Acceptable | Rural Infrastructure Finance
Year One
Total	192,160		618,946
Year Two
Total	572,095		681,272
Year Three
Total	665,560		187,746
Year Four
Total	189,652		593,841
Year Five
Total	585,661		701,937
Prior
Total	1,283,649		611,548
Revolving Loans - Amortized Cost Basis
Total	163,162		100,223
Total
Total	3,651,939		3,495,513
Special mention | Rural Infrastructure Finance
Year One
Total	0		0
Year Two
Total	0		9,850
Year Three
Total	34,814		0
Year Four
Total	0		0
Year Five
Total	0		0
Prior
Total	0		0
Revolving Loans - Amortized Cost Basis
Total	0		0
Total
Total	34,814		9,850
Substandard | Rural Infrastructure Finance
Year One
Total	0		0
Year Two
Total	0		29,400
Year Three
Total	0		0
Year Four
Total	0		0
Year Five
Total	0		0
Prior
Total	0		0
Revolving Loans - Amortized Cost Basis
Total	0		0
Total
Total	0		29,400
Rural Infrastructure Finance:
Total
Total	3,883,355		3,932,857
Rural Infrastructure Finance: | Agricultural Finance
Year One
Total	686		169,429
Current period charge-offs	0
Year Two
Total	167,655		246,512
Current period charge-offs	0
Year Three
Total	237,965		517,862
Current period charge-offs	0
Year Four
Total	506,137		535,398
Current period charge-offs	0
Year Five
Total	525,482		266,882
Current period charge-offs	0
Prior
Total	1,459,080		1,256,770
Current period charge-offs	0
Revolving Loans - Amortized Cost Basis
Total	372,366		404,991
Current period charge-offs	0
Total
Total	3,269,371		3,397,844
Current period charge-offs	0
Rural Infrastructure Finance: | Acceptable | Agricultural Finance
Year One
Total	686		169,429
Year Two
Total	167,655		246,441
Year Three
Total	236,692		515,396
Year Four
Total	503,681		534,395
Year Five
Total	520,556		264,815
Prior
Total	1,380,938		1,185,811
Revolving Loans - Amortized Cost Basis
Total	362,500		391,335
Total
Total	3,172,708		3,307,622
Rural Infrastructure Finance: | Special mention | Agricultural Finance
Year One
Total	0		0
Year Two
Total	0		71
Year Three
Total	71		2,466
Year Four
Total	2,456		872
Year Five
Total	4,817		531
Prior
Total	51,388		44,631
Revolving Loans - Amortized Cost Basis
Total	8,612		8,565
Total
Total	67,344		57,136
Rural Infrastructure Finance: | Substandard | Agricultural Finance
Year One
Total	0		0
Year Two
Total	0		0
Year Three
Total	1,202		0
Year Four
Total	0		131
Year Five
Total	109		1,536
Prior
Total	26,754		26,328
Revolving Loans - Amortized Cost Basis
Total	1,254		5,091
Total
Total	29,319		33,086
Long-Term Standby Purchase Commitments | Rural Infrastructure Finance
Year One
Total	0		0
Current period charge-offs	0	0
Year Two
Total	0		0
Current period charge-offs	0	0
Year Three
Total	0		0
Current period charge-offs	0	0
Year Four
Total	0		0
Current period charge-offs	0	0
Year Five
Total	0		0
Current period charge-offs	0	0
Prior
Total	391,099		419,190
Current period charge-offs	0	0
Revolving Loans - Amortized Cost Basis
Total	222,885		115,823
Current period charge-offs	0	0
Total
Total	613,984		535,013
Current period charge-offs	0	$ 0
Long-Term Standby Purchase Commitments | Acceptable | Rural Infrastructure Finance
Year One
Total	0		0
Year Two
Total	0		0
Year Three
Total	0		0
Year Four
Total	0		0
Year Five
Total	0		0
Prior
Total	391,099		419,190
Revolving Loans - Amortized Cost Basis
Total	222,885		115,823
Total
Total	613,984		535,013
Long-Term Standby Purchase Commitments | Special mention | Rural Infrastructure Finance
Year One
Total	0		0
Year Two
Total	0		0
Year Three
Total	0		0
Year Four
Total	0		0
Year Five
Total	0		0
Prior
Total	0		0
Revolving Loans - Amortized Cost Basis
Total	0		0
Total
Total	0		0
Long-Term Standby Purchase Commitments | Substandard | Rural Infrastructure Finance
Year One
Total	0		0
Year Two
Total	0		0
Year Three
Total	0		0
Year Four
Total	0		0
Year Five
Total	0		0
Prior
Total	0		0
Revolving Loans - Amortized Cost Basis
Total	0		0
Total
Total	$ 0		$ 0