Guarantees and Commitments - Changes in Reserve for Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance			$ 1,433
(Release of)/provision for losses	$ (45)	$ (167)	227	$ (440)
Ending Balance	1,660		1,660
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,471	882	819	1,068
(Release of)/provision for losses	(59)	(139)	593	(325)
Ending Balance	1,412	743	1,412	743
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	234	795	614	882
(Release of)/provision for losses	14	(28)	(366)	(115)
Ending Balance	$ 248	$ 767	$ 248	$ 767