LOANS - Changes in the Allowance for Losses (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 16,031,000
Ending balance	14,288,000
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	6,884,000	$ 6,775,000
Provision for/(release of) losses	220,000	4,197,000
Charge-offs	0	0
Ending balance	7,104,000	10,972,000
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,936,000	4,044,000
Provision for/(release of) losses	599,000	(111,000)
Charge-offs	0	0
Ending balance	4,535,000	3,933,000
Farm & Ranch | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses	1,400,000	1,100,000
Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,948,000	2,731,000
Provision for/(release of) losses	(379,000)	4,308,000
Charge-offs	0	0
Ending balance	2,569,000	7,039,000
Corporate AgFinance | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses	0	4,600,000
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	9,147,000	8,314,000
Provision for/(release of) losses	(1,963,000)	(3,613,000)
Charge-offs	0	0
Ending balance	7,184,000	4,701,000
Rural Infrastructure Finance | Collateral Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses	$ 0	$ 0