LOANS - Schedule of Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	$ 15,902,213	$ 15,902,213	$ 13,877,051
Nonaccrual Loans	240,133	240,133	238,049
Total Loans	18,619,095	18,619,095	16,706,520
Nonaccrual loans with no associated allowance	52,400	52,400	59,200
Interest received on nonaccrual loans	12,200	15,800	6,500
Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	226,746	226,746	224,662
Total Loans	10,865,223	10,865,223	9,945,439
Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	9,352,264	9,352,264	8,484,748
Nonaccrual Loans	218,441	218,441	179,478
Total Loans	9,352,264	9,352,264	8,484,748
Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	1,512,959	1,512,959	1,460,691
Nonaccrual Loans	8,305	8,305	45,184
Total Loans	1,512,959	1,512,959	1,460,691
Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,753,872	7,753,872	6,761,081
Nonaccrual Loans	13,387	13,387	13,387
Total Loans	7,753,872	7,753,872	6,761,081
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	18,308,719	18,308,719	16,434,377
Current | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	10,568,234	10,568,234	9,686,683
Current | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	9,068,619	9,068,619	8,271,176
Current | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	1,499,615	1,499,615	1,415,507
Current | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	7,740,485	7,740,485	6,747,694
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	70,243	70,243	34,094
Total Past Due | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	70,243	70,243	34,094
Total Past Due | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	65,204	65,204	34,094
Total Past Due | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,039	5,039	0
Total Past Due | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0	0
30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	40,885	40,885	21,209
30-59 Days | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	40,885	40,885	21,209
30-59 Days | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	35,846	35,846	21,209
30-59 Days | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	5,039	5,039	0
30-59 Days | Infrastructure Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	0	0
60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	16,335	16,335	8,595
60-89 Days | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	16,335	16,335	8,595
60-89 Days | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	16,335	16,335	8,595
60-89 Days | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	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	0
90 Days and Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	13,023	13,023	4,290
90 Days and Greater | Total Agricultural Finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	13,023	13,023	4,290
90 Days and Greater | Farm & Ranch
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	13,023	13,023	4,290
90 Days and Greater | Corporate AgFinance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, at amortized cost	0	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	$ 0