Guarantees and Commitments - Changes in Reserve for Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			$ 1,950
Release of losses	$ (163)	$ (222)	(273)	$ (1,166)
Ending balance	1,677		1,677
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	993	1,366	1,068	2,097
Release of losses	(111)	(172)	(186)	(903)
Charge-offs	0	0	0	0
Ending balance	882	1,194	882	1,194
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	847	967	882	1,180
Release of losses	(52)	(50)	(87)	(263)
Charge-offs	0	0	0	0
Ending balance	$ 795	$ 917	$ 795	$ 917