Farmer Mac Guaranteed Securities and USDA Guaranteed Securities - (Details) (USD $)	0 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Payment Guarantee [Member] \| Farmer Mac and USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	$ 6,669,951,000	$ 6,125,128,000
Available-for-sale Securities, Amortized Cost Basis	6,674,559,000	6,130,811,000
Available-for-sale Securities, Unrealized Gains	88,693,000	131,267,000
Available-for-sale Securities, Unrealized Losses	(57,805,000)	(9,225,000)
Available-for-sale securities	6,705,447,000	6,252,853,000
Marketable Securities	6,728,982,000	6,223,627,000
Marketable Securities, Amortized Cost	6,738,734,000	6,235,725,000
Marketable Securities, Unrealized Gains	88,919,000	131,891,000
Marketable Securities, Unrealized Losses	(59,887,000)	(10,575,000)
Marketable Securities	6,767,766,000	6,357,041,000
Payment Guarantee [Member] \| Categories of Investments, Marketable Securities, Trading Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	9,752,000	12,098,000
Farmer Mac Guarantee [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	5,098,209,000	4,663,944,000
Available-for-sale Securities, Amortized Cost Basis	5,097,891,000	4,663,652,000
Available-for-sale Securities, Unrealized Gains	82,213,000	111,662,000
Available-for-sale Securities, Unrealized Losses	(41,348,000)	(9,056,000)
Available-for-sale securities	5,138,756,000	4,766,258,000
Farmer Mac Guarantee [Member] \| Farm & Ranch Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	3,539,650,000	3,339,200,000
Available-for-sale Securities, Amortized Cost Basis	3,539,784,000	3,339,360,000
Available-for-sale Securities, Unrealized Gains	72,464,000	92,223,000
Available-for-sale Securities, Unrealized Losses	(13,725,000)	(5,094,000)
Available-for-sale securities	3,598,523,000	3,426,489,000
Farmer Mac Guarantee [Member] \| USDA Guarantees - Farmer Mac Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	24,925,000	26,238,000
Available-for-sale Securities, Amortized Cost Basis	24,473,000	25,786,000
Available-for-sale Securities, Unrealized Gains	1,239,000	909,000
Available-for-sale Securities, Unrealized Losses	(4,000)	(14,000)
Available-for-sale securities	25,708,000	26,681,000
Farmer Mac Guarantee [Member] \| Farmer Mac Guaranteed Securities - Rural Utilities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	1,533,634,000	1,298,506,000
Available-for-sale Securities, Amortized Cost Basis	1,533,634,000	1,298,506,000
Available-for-sale Securities, Unrealized Gains	8,510,000	18,530,000
Available-for-sale Securities, Unrealized Losses	(27,619,000)	(3,948,000)
Available-for-sale securities	1,514,525,000	1,313,088,000
USDA Guarantee [Member] \| USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	1,571,742,000	1,461,184,000
Available-for-sale Securities, Amortized Cost Basis	1,576,668,000	1,467,159,000
Available-for-sale Securities, Unrealized Gains	6,480,000	19,605,000
Available-for-sale Securities, Unrealized Losses	(16,457,000)	(169,000)
Available-for-sale securities	1,566,691,000	1,486,595,000
Trading Securities Unpaid Principal Balance	59,031,000	98,499,000
Trading Securities Amortized Cost	64,175,000	104,914,000
Trading Securities, Unrealized Gains	226,000	624,000
Trading Securities, Unrealized Losses	(2,082,000)	(1,350,000)
Trading securities	62,319,000	104,188,000
Available-for-sale Securities [Member] \| Payment Guarantee [Member] \| Farmer Mac and USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	4,608,000	5,683,000
Available-for-sale Securities [Member] \| Farmer Mac Guarantee [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(318,000)	(292,000)
Available-for-sale Securities [Member] \| Farmer Mac Guarantee [Member] \| Farm & Ranch Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	134,000	160,000
Available-for-sale Securities [Member] \| Farmer Mac Guarantee [Member] \| USDA Guarantees - Farmer Mac Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(452,000)	(452,000)
Available-for-sale Securities [Member] \| Farmer Mac Guarantee [Member] \| Farmer Mac Guaranteed Securities - Rural Utilities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	0	0
Available-for-sale Securities [Member] \| USDA Guarantee [Member] \| USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	4,926,000	5,975,000
Trading Account Assets [Member] \| USDA Guarantee [Member] \| Trading Securities, USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	$ 5,144,000	$ 6,415,000

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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