Guarantees and Commitments - Reserve For Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Guarantor Obligations [Line Items]
Reserve for losses	$ 1,433	$ 1,950
Agricultural Finance
Guarantor Obligations [Line Items]
Reserve for losses	819	1,068	$ 2,097	$ 2,164
Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Reserve for losses	$ 614	$ 882	$ 1,180	$ 0