Farmer Mac Guaranteed Securities and USDA Securities - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unrealized loss position for less than 12 months
Unrealized loss position for less than 12 months, Fair Value	$ 1,989,439	$ 537,162
Unrealized loss position for less than 12 months, Unrealized Loss	(9,419)	(636)
Unrealized loss position for more than 12 months
Unrealized loss position for more than 12 months, Fair Value	107,592	349,825
Unrealized loss position for more than 12 months, Unrealized Loss	(1,055)	(2,944)
USDA Securities:
Unrealized loss position for less than 12 months
Fair Value	0	0
Unrealized Loss	0	0
Unrealized loss position for more than 12 months
Fair Value	0	21,061
Unrealized Loss	0	(560)
Farmer Mac Guaranteed Securities and USDA Securities
Unrealized loss position for less than 12 months
Fair Value	1,387,236	49,939
Unrealized Loss	(12,764)	(61)
Unrealized loss position for more than 12 months
Fair Value	0	21,061
Unrealized Loss	0	(560)
AgVantage | Farmer Mac Guaranteed Securities
Unrealized loss position for less than 12 months
Fair Value	1,387,236	49,939
Unrealized Loss	(12,764)	(61)
Unrealized loss position for more than 12 months
Fair Value	0	0
Unrealized Loss	0	0
Unrealized loss position for less than 12 months
Unrealized loss position for less than 12 months, Fair Value	1,867,364	133,703
Unrealized loss position for less than 12 months, Unrealized Loss	(17,263)	(231)
Unrealized loss position for more than 12 months
Unrealized loss position for more than 12 months, Fair Value	90,971	981,757
Unrealized loss position for more than 12 months, Unrealized Loss	$ (2,747)	$ (15,007)