Guarantees and Commitments - Schedule of Underlying Off-Balance Sheet Guaranteed Securities (Details) - Farmer Mac Guaranteed USDA Securities - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Guarantee and commitment obligation	$ 6,607	$ 7,355
Weighted-average remaining maturity	21 years 4 months 24 days	21 years 8 months 12 days
AgVantage Securities
Guarantor Obligations [Line Items]
Weighted-average remaining maturity	2 years 2 months 12 days	3 years