LOANS - Changes in the Allowance for Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			$ 16,031,000
Provision for/(release of) losses	$ 3,428,000	$ (136,000)	7,806,000	$ 1,484,000
Ending balance	19,951,000		19,951,000
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	8,690,000	11,302,000	6,884,000	6,775,000
Provision for/(release of) losses	1,911,000	(3,714,000)	7,760,000	813,000
Charge-offs	0	0	(4,043,000)	0
Ending balance	10,601,000	7,588,000	10,601,000	7,588,000
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,676,000	3,935,000	3,936,000	4,044,000
Provision for/(release of) losses	156,000	(25,000)	997,000	(134,000)
Charge-offs	0	0	(101,000)	0
Ending balance	4,832,000	3,910,000	4,832,000	3,910,000
Farm & Ranch | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses			1,200,000	1,100,000
Corporate AgFinance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,014,000	7,367,000	2,948,000	2,731,000
Provision for/(release of) losses	1,755,000	(3,689,000)	6,763,000	947,000
Charge-offs	0	0	(3,942,000)	0
Ending balance	5,769,000	3,678,000	5,769,000	3,678,000
Corporate AgFinance | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses			1,100,000	0
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	7,810,000	5,446,000	9,147,000	8,314,000
Provision for/(release of) losses	1,540,000	3,580,000	203,000	712,000
Charge-offs	0	0	0	0
Ending balance	$ 9,350,000	$ 9,026,000	9,350,000	9,026,000
Rural Infrastructure Finance | Collateral Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses			$ 0	$ 0