Guarantees and Commitments - Schedule of Underlying Off-Balance Sheet Guaranteed Securities (Details) - Farmer Mac Guaranteed USDA Securities - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Guarantee and commitment obligation		$ 6,461	$ 7,355
Weighted-average remaining maturity	21 years 8 months 12 days	21 years 4 months 24 days
AgVantage Securities
Guarantor Obligations [Line Items]
Weighted-average remaining maturity	3 years	2 years