Guarantees and Commitments - Off-Balance Sheet Guaranteed Securities (Details) - Farmer Mac Guaranteed USDA Securities - Unconsolidated VIE - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Total off-balance sheet Farmer Mac Guaranteed Securities	$ 489,193	$ 502,122
Agricultural Finance
Guarantor Obligations [Line Items]
Total off-balance sheet Farmer Mac Guaranteed Securities	488,095	500,953
Rural Infrastructure Finance
Guarantor Obligations [Line Items]
Total off-balance sheet Farmer Mac Guaranteed Securities	$ 1,098	$ 1,169