LOANS - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	$ 11,636,815	$ 11,183,408
Nonaccrual loans	196,709	168,915
Total Loans	13,986,939	13,609,172
Nonaccrual loans with no associated allowance	36,400	41,500
Interest received on nonaccrual loans	1,300	4,900
Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	196,709	168,915
Total Loans	8,877,949	8,834,689
Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,506,747	7,453,015
Nonaccrual loans	151,795	123,546
Total Loans	7,506,747	7,453,015
Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	1,371,202	1,381,674
Nonaccrual loans	44,914	45,369
Total Loans	1,371,202	1,381,674
Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,108,990	4,774,483
Nonaccrual loans	0	0
Total Loans	5,108,990	4,774,483
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	13,750,605	13,410,152
Current | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	8,641,615	8,635,669
Current | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,320,821	7,299,364
Current | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	1,320,794	1,336,305
Current | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,108,990	4,774,483
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	39,625	30,105
Total Past Due | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	39,625	30,105
Total Past Due | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	34,131	30,105
Total Past Due | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,494	0
Total Past Due | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0
30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	22,498	16,478
30-59 Days | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	22,498	16,478
30-59 Days | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	17,004	16,478
30-59 Days | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,494	0
30-59 Days | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0
60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,031	7,268
60-89 Days | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,031	7,268
60-89 Days | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,031	7,268
60-89 Days | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0
60-89 Days | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0
90 Days and Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	10,096	6,359
90 Days and Greater | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	10,096	6,359
90 Days and Greater | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	10,096	6,359
90 Days and Greater | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0
90 Days and Greater | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	$ 0	$ 0