Guarantees and Commitments - Changes in Reserve for Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 1,950
Provision for losses	(517)	$ (1,327)	$ 250
Ending balance	1,433	1,950
Agricultural Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,068	2,097	2,164
Provision for losses	(249)	(1,029)	81
Ending balance	819	1,068	2,097
Agricultural Finance | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			(148)
Agricultural Finance | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			2,016
Rural Infrastructure Finance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	882	1,180	0
Provision for losses	(268)	(298)	169
Ending balance	$ 614	$ 882	1,180
Rural Infrastructure Finance | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			1,011
Rural Infrastructure Finance | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance			$ 1,011