Guarantees and Commitments - Credit Quality Indicators (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total
Total	$ 9,011,820	$ 8,314,096
Current period charge-offs			$ 5,800
Agricultural Finance
Total
Current period charge-offs	(84)		5,759
Current period recoveries		(1,054)
Rural Infrastructure Finance
Year One
Total	741,021	242,570
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Two
Total	220,420	635,166
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Three
Total	629,223	774,941
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Four
Total	739,270	8,100
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Five
Total	7,932	86,878
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Prior
Total	649,830	628,903
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Revolving Loans - Amortized Cost Basis
Total	33,570	12,578
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Total
Total	3,021,266	2,389,136
Current period charge-offs	0	0	$ 0
Current period recoveries	0	0
Current period Agricultural Finance net charge-offs	0	0
Acceptable | Rural Infrastructure Finance
Year One
Total	741,021	242,570
Year Two
Total	220,420	612,366
Year Three
Total	629,223	774,941
Year Four
Total	739,270	8,100
Year Five
Total	7,932	86,878
Prior
Total	649,830	628,903
Revolving Loans - Amortized Cost Basis
Total	33,570	12,578
Total
Total	3,021,266	2,366,336
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
Substandard | Rural Infrastructure Finance
Year One
Total	0	0
Year Two
Total	0	22,800
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	22,800
Long-Term Standby Purchase Commitments and Guaranteed Securities
Total
Total	3,714,184	3,521,593
Long-Term Standby Purchase Commitments and Guaranteed Securities | Agricultural Finance
Year One
Total	202,998	376,027
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Two
Total	497,588	544,098
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Three
Total	537,752	245,089
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Four
Total	254,293	200,298
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Five
Total	212,165	251,812
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Prior
Total	1,183,111	1,089,305
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Revolving Loans - Amortized Cost Basis
Total	303,085	258,127
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Total
Total	3,190,992	2,964,756
Current period charge-offs	0	0
Current period recoveries	0	0
Current period Agricultural Finance net charge-offs	0	0
Long-Term Standby Purchase Commitments and Guaranteed Securities | Acceptable | Agricultural Finance
Year One
Total	202,998	376,027
Year Two
Total	496,269	537,521
Year Three
Total	535,798	244,365
Year Four
Total	254,293	188,452
Year Five
Total	207,379	235,865
Prior
Total	1,107,834	1,013,937
Revolving Loans - Amortized Cost Basis
Total	296,508	252,039
Total
Total	3,101,079	2,848,206
Long-Term Standby Purchase Commitments and Guaranteed Securities | Special mention | Agricultural Finance
Year One
Total	0	0
Year Two
Total	1,319	5,270
Year Three
Total	1,778	0
Year Four
Total	0	6,808
Year Five
Total	1,198	3,154
Prior
Total	42,680	38,042
Revolving Loans - Amortized Cost Basis
Total	3,205	2,354
Total
Total	50,180	55,628
Long-Term Standby Purchase Commitments and Guaranteed Securities | Substandard | Agricultural Finance
Year One
Total	0	0
Year Two
Total	0	1,307
Year Three
Total	176	724
Year Four
Total	0	5,038
Year Five
Total	3,588	12,793
Prior
Total	32,597	37,326
Revolving Loans - Amortized Cost Basis
Total	3,372	3,734
Total
Total	39,733	60,922
Long-Term Standby Purchase Commitments | Rural Infrastructure Finance
Year One
Total	0	0
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Two
Total	0	0
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Three
Total	0	0
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Four
Total	0	0
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Year Five
Total	0	0
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Prior
Total	470,659	499,594
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Revolving Loans - Amortized Cost Basis
Total	52,533	57,243
Current period charge-offs	0	0
Current period recoveries	0	0
Current period, net charge offs	0	0
Total
Total	523,192	556,837
Current period charge-offs	0	0
Current period recoveries	0	0
Current period Agricultural Finance net 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	470,659	499,594
Revolving Loans - Amortized Cost Basis
Total	52,533	57,243
Total
Total	523,192	556,837
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