COVER PAGE - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-14951
Entity Registrant Name	FEDERAL AGRICULTURAL MORTGAGE CORPORATION
Entity Incorporation, State or Country Code	X1
Entity Tax Identification Number	52-1578738
Entity Address, Address Line One	1999 K Street, N.W.
Entity Address, Address Line Two	4th Floor,
Entity Address, City or Town	Washington,
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20006
City Area Code	(202)
Local Phone Number	872-7700
Title of 12(g) Security	Class B voting common stock
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000845877
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date:	--12-31
Class A voting common stock
Entity Information [Line Items]
Title of 12(b) Security	Class A voting common stock
Trading Symbol	AGM.A
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		1,030,780
Class C non-voting common stock
Entity Information [Line Items]
Title of 12(b) Security	Class C non-voting common stock
Trading Symbol	AGM
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		9,309,771
6.000% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series C
Entity Information [Line Items]
Title of 12(b) Security	6.000% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series C
Trading Symbol	AGM.PRC
Security Exchange Name	NYSE
5.700% Non-Cumulative Preferred Stock, Series D
Entity Information [Line Items]
Title of 12(b) Security	5.700% Non-Cumulative Preferred Stock, Series D
Trading Symbol	AGM.PRD
Security Exchange Name	NYSE
5.750% Non-Cumulative Preferred Stock, Series E
Entity Information [Line Items]
Title of 12(b) Security	5.750% Non-Cumulative Preferred Stock, Series E
Trading Symbol	AGM.PRE
Security Exchange Name	NYSE
5.250% Non-Cumulative Preferred Stock, Series F
Entity Information [Line Items]
Title of 12(b) Security	5.250% Non-Cumulative Preferred Stock, Series F
Trading Symbol	AGM.PRF
Security Exchange Name	NYSE
4.875% Non-Cumulative Preferred Stock, Series G
Entity Information [Line Items]
Title of 12(b) Security	4.875% Non-Cumulative Preferred Stock, Series G
Trading Symbol	AGM.PRG
Security Exchange Name	NYSE
Class B voting common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		500,301