LOANS - Changes in the Allowance for Losses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 15,089,000
(Release of)/provision for losses	858,000	$ 1,323,000	$ (860,000)
Ending balance	16,031,000	15,089,000
Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	15,089,000
Ending balance	16,031,000	15,089,000
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	100,000	3,400,000	(1,400,000)
Agricultural Finance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	6,775,000	3,442,000	3,745,000
(Release of)/provision for losses	109,000	3,417,000	(1,357,000)
Recovery			1,054,000
Charge-offs	0	(84,000)
Ending balance	6,884,000	6,775,000	3,442,000
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0	(84,000)
Farm & Ranch | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,044,000	2,882,000	3,404,000
(Release of)/provision for losses	(108,000)	1,246,000	(1,576,000)
Recovery			1,054,000
Charge-offs	0	(84,000)
Ending balance	3,936,000	4,044,000	2,882,000
Farm & Ranch | Operating Segments
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	(145,000)	1,463,000	(1,574,000)
Farm & Ranch | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	1,000,000	1,900,000
Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0	0
Corporate AgFinance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,731,000	560,000	341,000
(Release of)/provision for losses	217,000	2,171,000	219,000
Recovery			0
Charge-offs	0	0
Ending balance	2,948,000	2,731,000	560,000
Corporate AgFinance | Operating Segments
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	207,000	2,136,000	210,000
Corporate AgFinance | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	0	2,400,000
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	800,000	(2,300,000)	500,000
Charge-offs	0	0
Rural Infrastructure Finance | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	8,314,000	10,599,000	10,087,000
(Release of)/provision for losses	833,000	(2,285,000)	512,000
Recovery			0
Charge-offs	0	0
Ending balance	9,147,000	8,314,000	$ 10,599,000
Rural Infrastructure Finance | Collateral Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
(Release of)/provision for losses	$ 0	$ 0