Guarantees and Commitments - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Total	$ 9,129,176	$ 9,008,979
Agricultural Finance
Guarantor Obligations [Line Items]
Total	3,728,259	3,714,184
Current
Guarantor Obligations [Line Items]
Total	10,809,497	10,459,282
Current | Agricultural Finance
Guarantor Obligations [Line Items]
Total	3,718,059	3,698,131
Total Past Due
Guarantor Obligations [Line Items]
Total	17,922	11,598
Total Past Due | Agricultural Finance
Guarantor Obligations [Line Items]
Total	10,200	16,053
30-59 Days
Guarantor Obligations [Line Items]
Total	10,182	10,066
30-59 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total	5,630	11,614
60-89 Days
Guarantor Obligations [Line Items]
Total	1,853	392
60-89 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total	0	622
90 Days and Greater
Guarantor Obligations [Line Items]
Total	5,887	1,140
90 Days and Greater | Agricultural Finance
Guarantor Obligations [Line Items]
Total	4,570	3,817
Agricultural Finance | Agricultural Finance
Guarantor Obligations [Line Items]
Total	3,237,845	3,190,992
Agricultural Finance | Current
Guarantor Obligations [Line Items]
Total	7,502,730	7,438,016
Agricultural Finance | Current | Agricultural Finance
Guarantor Obligations [Line Items]
Total	3,227,645	3,174,939
Agricultural Finance | Total Past Due
Guarantor Obligations [Line Items]
Total	17,922	11,598
Agricultural Finance | Total Past Due | Agricultural Finance
Guarantor Obligations [Line Items]
Total	10,200	16,053
Agricultural Finance | 30-59 Days
Guarantor Obligations [Line Items]
Total	10,182	10,066
Agricultural Finance | 30-59 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total	5,630	11,614
Agricultural Finance | 60-89 Days
Guarantor Obligations [Line Items]
Total	1,853	392
Agricultural Finance | 60-89 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total	0	622
Agricultural Finance | 90 Days and Greater
Guarantor Obligations [Line Items]
Total	5,887	1,140
Agricultural Finance | 90 Days and Greater | Agricultural Finance
Guarantor Obligations [Line Items]
Total	4,570	3,817
Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	3,306,767	3,021,266
Rural Infrastructure Finance | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	490,414	523,192
Rural Infrastructure Finance | Current
Guarantor Obligations [Line Items]
Total	3,306,767	3,021,266
Rural Infrastructure Finance | Current | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	490,414	523,192
Rural Infrastructure Finance | Total Past Due
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | Total Past Due | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 30-59 Days
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 30-59 Days | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 60-89 Days
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 60-89 Days | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 90 Days and Greater
Guarantor Obligations [Line Items]
Total	0	0
Rural Infrastructure Finance | 90 Days and Greater | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total	$ 0	$ 0