GUARANTEES AND COMMITMENTS - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Total Loans	$ 9,837,962	$ 9,623,119
Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	3,883,355	3,932,857
Current
Guarantor Obligations [Line Items]
Total Loans	11,472,618	11,264,691
Current | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	3,868,467	3,925,931
Total Past Due
Guarantor Obligations [Line Items]
Total Loans	33,341	30,270
Total Past Due | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	14,888	6,926
30-59 Days
Guarantor Obligations [Line Items]
Total Loans	13,764	15,326
30-59 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	4,791	2,776
60-89 Days
Guarantor Obligations [Line Items]
Total Loans	3,954	3,953
60-89 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	528	2,366
90 Days and Greater
Guarantor Obligations [Line Items]
Total Loans	15,623	10,991
90 Days and Greater | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	9,569	1,784
Agricultural Finance | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	3,269,371	3,397,844
Agricultural Finance | Current
Guarantor Obligations [Line Items]
Total Loans	7,785,865	7,729,928
Agricultural Finance | Current | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	3,254,483	3,390,918
Agricultural Finance | Total Past Due
Guarantor Obligations [Line Items]
Total Loans	33,341	30,270
Agricultural Finance | Total Past Due | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	14,888	6,926
Agricultural Finance | 30-59 Days
Guarantor Obligations [Line Items]
Total Loans	13,764	15,326
Agricultural Finance | 30-59 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	4,791	2,776
Agricultural Finance | 60-89 Days
Guarantor Obligations [Line Items]
Total Loans	3,954	3,953
Agricultural Finance | 60-89 Days | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	528	2,366
Agricultural Finance | 90 Days and Greater
Guarantor Obligations [Line Items]
Total Loans	15,623	10,991
Agricultural Finance | 90 Days and Greater | Agricultural Finance
Guarantor Obligations [Line Items]
Total Loans	9,569	1,784
Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total Loans	3,686,753	3,534,763
Rural Infrastructure Finance | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total Loans	613,984	535,013
Rural Infrastructure Finance | Current
Guarantor Obligations [Line Items]
Total Loans	3,686,753	3,534,763
Rural Infrastructure Finance | Current | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total Loans	613,984	535,013
Rural Infrastructure Finance | Total Past Due
Guarantor Obligations [Line Items]
Total Loans	0	0
Rural Infrastructure Finance | Total Past Due | Rural Infrastructure Finance
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 | Rural Infrastructure Finance
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 | Rural Infrastructure Finance
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 | Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total Loans	$ 0	$ 0