LOANS - Changes in the Allowance for Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			$ 16,031,000
Provision for/(release of) losses	$ 6,179,000	$ 1,073,000	4,378,000	$ 1,620,000
Ending balance	16,500,000		16,500,000
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	7,104,000	10,972,000	6,884,000	6,775,000
Provision for/(release of) losses	5,629,000	330,000	5,849,000	4,527,000
Charge-offs	(4,043,000)	0	(4,043,000)	0
Ending balance	8,690,000	11,302,000	8,690,000	11,302,000
Farm & Ranch
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,535,000	3,933,000	3,936,000	4,044,000
Provision for/(release of) losses	242,000	2,000	841,000	(109,000)
Charge-offs	(101,000)	0	(101,000)	0
Ending balance	4,676,000	3,935,000	4,676,000	3,935,000
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	2,569,000	7,039,000	2,948,000	2,731,000
Provision for/(release of) losses	5,387,000	328,000	5,008,000	4,636,000
Charge-offs	(3,942,000)	0	(3,942,000)	0
Ending balance	4,014,000	7,367,000	4,014,000	7,367,000
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	7,184,000	4,701,000	9,147,000	8,314,000
Provision for/(release of) losses	626,000	745,000	(1,337,000)	(2,868,000)
Charge-offs	0	0	0	0
Ending balance	$ 7,810,000	$ 5,446,000	7,810,000	5,446,000
Rural Infrastructure Finance | Collateral Pledged
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for/(release of) losses			$ 0	$ 0