Farmer Mac Guaranteed Securities and USDA Guaranteed Securities (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Payment Guarantee [Member] \| Farmer Mac and USDA Guaranteed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	$ 6,125,128	$ 5,411,696
Available-for-sale Securities, Amortized Cost Basis	6,130,811	5,431,203
Available-for-sale Securities, Unrealized Gains	131,267	139,214
Available-for-sale Securities, Unrealized Losses	(9,225)	(1,599)
Available-for-sale securities	6,252,853	5,568,818
Marketable Securities	6,223,627	5,611,889
Marketable Securities, Amortized Cost	6,235,725	5,644,333
Marketable Securities, Unrealized Gains	131,891	141,018
Marketable Securities, Unrealized Losses	(10,575)	(4,174)
Marketable securities	6,357,041	5,781,177
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	12,098	32,444
Farmer Mac Guarantee \| Farmer Mac I Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	3,339,200	2,730,000
Available-for-sale Securities, Amortized Cost Basis	3,339,360	2,741,192
Available-for-sale Securities, Unrealized Gains	92,223	67,895
Available-for-sale Securities, Unrealized Losses	(5,094)	(1,460)
Available-for-sale securities	3,426,489	2,807,627
Farmer Mac Guarantee \| Farmer Mac II Guaranteed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	26,238	35,410
Available-for-sale Securities, Amortized Cost Basis	25,786	34,692
Available-for-sale Securities, Unrealized Gains	909	924
Available-for-sale Securities, Unrealized Losses	(14)	(17)
Available-for-sale securities	26,681	35,599
Farmer Mac Guarantee \| Farmer Mac Guaranteed Securities - Rural Utilities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	1,298,506	1,410,800
Available-for-sale Securities, Amortized Cost Basis	1,298,506	1,410,800
Available-for-sale Securities, Unrealized Gains	18,530	35,246
Available-for-sale Securities, Unrealized Losses	(3,948)	0
Available-for-sale securities	1,313,088	1,446,046
USDA Guarantee \| USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale, at fair value	1,461,184	1,235,486
Available-for-sale Securities, Amortized Cost Basis	1,467,159	1,244,519
Available-for-sale Securities, Unrealized Gains	19,605	35,149
Available-for-sale Securities, Unrealized Losses	(169)	(122)
Available-for-sale securities	1,486,595	1,279,546
USDA Trading Securities Unpaid Principal Balance	98,499	200,193
Trading Securities Amortized Cost	104,914	213,130
Trading Securities, Unrealized Gains	624	1,804
Trading Securities, Unrealized Losses	(1,350)	(2,575)
Trading securities	104,188	212,359
Available-for-sale Securities [Member] \| Payment Guarantee [Member] \| Farmer Mac and USDA Guaranteed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	5,683	19,507
Available-for-sale Securities [Member] \| Farmer Mac Guarantee \| Farmer Mac I Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	160	11,192
Available-for-sale Securities [Member] \| Farmer Mac Guarantee \| Farmer Mac II Guaranteed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(452)	(718)
Available-for-sale Securities [Member] \| Farmer Mac Guarantee \| Farmer Mac Guaranteed Securities - Rural Utilities
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 \| USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	5,975	9,033
Trading Account Assets [Member] \| USDA Guarantee \| Trading Securities, USDA Guaranteed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	$ 6,415	$ 12,937

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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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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

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