LOANS - Allowance for Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 14,288	$ 16,031
Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	14,288	16,031
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	7,104	6,884	$ 10,972	$ 6,775
Agricultural Finance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	7,104	6,884
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,535	3,936	3,933	4,044
Farm & Ranch | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,535	3,936
Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,569	2,948	7,039	2,731
Corporate AgFinance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,569	2,948
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	7,184	9,147	$ 4,701	$ 8,314
Rural Infrastructure Finance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 7,184	$ 9,147