Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 01, 2013 Common Stock, Class A Voting [Member]	Nov. 01, 2013 Common stock, Class B Voting [Member]	Nov. 01, 2013 Common stock, 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/A
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	true
Amendment Description	This Amendment No. 2 on Form 10-Q/A (“Amendment 2”) to the Quarterly Report on Form 10-Q of the Federal Agricultural Mortgage Corporation (“Farmer Mac”) for the fiscal quarter ended September 30, 2013 (the “Third Quarter 2013 Form 10-Q”), initially filed with the Securities and Exchange Commission (the “SEC”) on November 12, 2013 (the “Original Filing”), as amended by Amendment No. 1 on Form 10-Q/A filed with the SEC on November 12, 2013 (“Amendment 1”) is being filed because the certifications required by Rules 13a-14(a) and 15d-14(a) were not included as exhibits to the Original Filing due to a technological error and were filed separately with Amendment 1. Amendment 2 is now being filed to include the certifications required by Rules 13a-14(a) and 15d-14(a) as exhibits to the Original Filing, as a complete submission. Except as described above, no other changes have been made to the Third Quarter 2013 Form 10-Q, as amended by Amendment 1, and this Amendment 2 does not amend, update, or change the financial statements or disclosures in the Third Quarter 2013 Form 10-Q, as amended by Amendment 1. Therefore, this Amendment 2 does not reflect events occurring after the filing of the Original Filing or Amendment 1 or amend or update those disclosures, or related exhibits, affected by subsequent events. Accordingly, this Amendment 2 should be read in conjunction with Farmer Mac’s other filings with the SEC subsequent to the filing of the Original Filing and Amendment 1.
Trading Symbol	AGM
Entity Common Stock, Shares Outstanding		1,030,780	500,301	9,333,160