Guarantees and Commitments - Schedule of Underlying Off-Balance Sheet Guaranteed Securities (Details) - Farmer Mac Guaranteed USDA Securities - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Guarantee and commitment obligation	$ 6,737	$ 7,355
Weighted-average remaining maturity	21 years 7 months 6 days	21 years 8 months 12 days
AgVantage Securities
Guarantor Obligations [Line Items]
Weighted-average remaining maturity	2 years 6 months	3 years