Business Segment Reporting - Narrative (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total notes payable	$ 11,519,280,000	$ 12,339,950,000
Farmer Mac II LLC [Member]
Segment Reporting Information [Line Items]
Assets, Fair Value Disclosure	1,800,000,000
Total notes payable	429,000,000
Preferred Stock outstanding	250,000,000
Common Stock outstanding	$ 1,000,000,000