Equity - Quarterly Dividends Paid by Farmer Mac (Details) - $ / shares						3 Months Ended												12 Months Ended
	May 27, 2021	Aug. 20, 2020	May 20, 2020	May 13, 2019	Jun. 20, 2014	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Series A
Class of Stock [Line Items]
Preferred stock, dividend rate																				5.875%
Preferred stock dividends (in dollars per share)														$ 0	$ 0.2530	$ 0.3672	$ 0.3672
Series C
Class of Stock [Line Items]
Preferred stock, dividend rate					6.00%													6.00%	6.00%	6.00%
Preferred stock dividends (in dollars per share)						$ 0.3750	$ 0.3750	$ 0.3750	$ 0.3750	$ 0.3750	$ 0.3750	$ 0.3750	$ 0.3750	0.3750	0.3750	0.3750	0.3750
Series D
Class of Stock [Line Items]
Preferred stock, dividend rate				5.70%														5.70%	5.70%	5.70%
Preferred stock dividends (in dollars per share)						0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563	0.3563
Series E
Class of Stock [Line Items]
Preferred stock, dividend rate			5.75%															5.75%	5.75%	5.75%
Preferred stock dividends (in dollars per share)						0.3594	0.3594	0.3594	0.3594	0.3594	0.3594	0.3594	0.3594	0.3594	0.3594	0.2276	0
Series E | May 20, 2020 to July 17, 2020
Class of Stock [Line Items]
Preferred stock dividends (in dollars per share)																0.2276
Series E | July 17, 2020 to September 19, 2020
Class of Stock [Line Items]
Preferred stock dividends (in dollars per share)															0.2530
Series F
Class of Stock [Line Items]
Preferred stock, dividend rate		5.25%																5.25%	5.25%	5.25%
Preferred stock dividends (in dollars per share)						0.3281	0.3281	0.3281	0.3281	0.3281	0.3281	0.3281	0.3281	$ 0.3281	0.2078	$ 0	$ 0
Series F | August 20, 2020 to October 17, 2020
Class of Stock [Line Items]
Preferred stock dividends (in dollars per share)															$ 0.2078
Series G
Class of Stock [Line Items]
Preferred stock, dividend rate	4.875%																	4.875%	4.875%
Preferred stock dividends (in dollars per share)						$ 0.3047	$ 0.3047	$ 0.3047	$ 0.3047	$ 0.3047	$ 0.3047	$ 0.1693	$ 0