LOANS - Schedule of Allowance for Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	$ 48,325	$ 47,167	$ 37,785	$ 35,340	$ 29,956	$ 23,223
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	15,795	15,472	9,400	11,134	6,635	5,132
Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	8,602	7,211	6,631	7,128	6,943	5,379
Infrastructure Finance loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	23,928	$ 24,484	21,754	$ 17,078	$ 16,378	$ 12,712
Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	48,325		37,785
Real Estate Loan | Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	15,795		9,400
Real Estate Loan | Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	8,602		6,631
Real Estate Loan | Infrastructure Finance loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Losses	$ 23,928		$ 21,754