Guarantees and Commitments - Changes in Reserve for Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			$ 1,950
Release of losses	$ (167)	$ (111)	(440)	$ (1,277)
Ending balance	1,510		1,510
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	882	1,194	1,068	2,097
Release of losses	(139)	(91)	(325)	(994)
Charge-offs	0	0	0	0
Ending balance	743	1,103	743	1,103
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	795	917	882	1,180
Release of losses	(28)	(20)	(115)	(283)
Charge-offs	0	0	0	0
Ending balance	$ 767	$ 897	$ 767	$ 897