Cover Page
May 27, 2020
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date May 27, 2020
Entity Registrant Name FEDERAL AGRICULTURAL MORTGAGE CORPORATION
City Area Code 202
Local Phone Number 872-7700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity File Number 001-14951
Entity Central Index Key 0000845877
Entity Tax Identification Number 52-1578738
Entity Address, Address Line One 1999 K Street, N.W., 4th Floor,
Entity Address, Postal Zip Code 20006
Amendment Flag false
Entity Incorporation, State or Country Code X1
Entity Address, City or Town Washington,
Entity Address, State or Province DC
Entity Emerging Growth Company false
Common Class A [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Class A voting common stock
Trading Symbol AGM.A
Security Exchange Name NYSE
Common Class C [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Class C non-voting common stock
Trading Symbol AGM
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Entity Information [Line Items]  
Title of 12(b) Security 5.875% Non-Cumulative Preferred Stock, Series A
Trading Symbol AGM.PRA
Security Exchange Name NYSE
Series C Preferred Stock [Member]  
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
Series D Preferred Stock [Member]  
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
Series E Preferred Stock  
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