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, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Guarantee and commitment obligation	$ 6,269	$ 6,461
Weighted-average remaining maturity	21 years 3 months 18 days	21 years 4 months 24 days
AgVantage Securities
Guarantor Obligations [Line Items]
Weighted-average remaining maturity	1 year 8 months 12 days	2 years