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Document Entity Information Statement
6 Months Ended
Jun. 30, 2014
Aug. 01, 2014
Common Class A, Voting [Member]
Aug. 01, 2014
Common Class B, Voting [Member]
Aug. 01, 2014
Common Class C, Non-Voting [Member]
Document Information [Line Items]        
Entity Registrant Name FEDERAL AGRICULTURAL MORTGAGE CORP      
Entity Central Index Key 0000845877      
Current Fiscal Year End Date --12-31      
Entity Filer Category Accelerated Filer      
Document Type 10-Q      
Document Period End Date Jun. 30, 2014      
Document Fiscal Year Focus 2014      
Document Fiscal Period Focus Q2      
Amendment Flag false      
Trading Symbol AGM      
Entity Common Stock, Shares Outstanding   1,030,780 500,301 9,393,199