GUARANTEES AND COMMITMENTS - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Total Loans	$ 10,668,844	$ 9,623,119
Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	3,808,570	3,932,857
Current
Guarantor Obligations [Line Items]
Total Loans	12,450,327	11,264,691
Current | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	3,793,890	3,925,931
Total Past Due
Guarantor Obligations [Line Items]
Total Loans	60,825	30,270
Total Past Due | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	14,680	6,926
30-59 Days
Guarantor Obligations [Line Items]
Total Loans	14,363	15,326
30-59 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	2,090	2,776
60-89 Days
Guarantor Obligations [Line Items]
Total Loans	12,072	3,953
60-89 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	6,232	2,366
90 Days and Greater
Guarantor Obligations [Line Items]
Total Loans	34,390	10,991
90 Days and Greater | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	6,358	1,784
Agricultural Finance | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	3,197,407	3,397,844
Agricultural Finance | Current
Guarantor Obligations [Line Items]
Total Loans	8,066,972	7,729,928
Agricultural Finance | Current | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	3,182,727	3,390,918
Agricultural Finance | Total Past Due
Guarantor Obligations [Line Items]
Total Loans	60,825	30,270
Agricultural Finance | Total Past Due | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	14,680	6,926
Agricultural Finance | 30-59 Days
Guarantor Obligations [Line Items]
Total Loans	14,363	15,326
Agricultural Finance | 30-59 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	2,090	2,776
Agricultural Finance | 60-89 Days
Guarantor Obligations [Line Items]
Total Loans	12,072	3,953
Agricultural Finance | 60-89 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	6,232	2,366
Agricultural Finance | 90 Days and Greater
Guarantor Obligations [Line Items]
Total Loans	34,390	10,991
Agricultural Finance | 90 Days and Greater | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	6,358	1,784
Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total Loans	4,383,355	3,534,763
Rural Infrastructure Finance | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	611,163	535,013
Rural Infrastructure Finance | Current
Guarantor Obligations [Line Items]
Total Loans	4,383,355	3,534,763
Rural Infrastructure Finance | Current | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	611,163	535,013
Rural Infrastructure Finance | Total Past Due
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | Total Past Due | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 30-59 Days
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 30-59 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 60-89 Days
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 60-89 Days | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 90 Days and Greater
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | 90 Days and Greater | Long-Term Standby Purchase Commitments and Guaranteed Securities
Guarantor Obligations [Line Items]
Total Loans	$ 0	$ 0