The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Allowance for Losses and Concentration of Credit Risk - Defaulted Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 LTSPCs	Sep. 30, 2011 LTSPCs	Mar. 31, 2011 LTSPCs defaulted_loan	Sep. 30, 2012 LTSPCs	Sep. 30, 2011 LTSPCs	Sep. 30, 2012 LTSPCs Farmer Mac I Guaranteed Securities defaulted_loan	Sep. 30, 2011 LTSPCs Farmer Mac I Guaranteed Securities defaulted_loan	Sep. 30, 2012 LTSPCs Farmer Mac I Guaranteed Securities defaulted_loan	Sep. 30, 2011 LTSPCs Farmer Mac I Guaranteed Securities defaulted_loan	Sep. 30, 2012 Farmer Mac Guaranteed Securities Farmer Mac I Guaranteed Securities	Sep. 30, 2011 Farmer Mac Guaranteed Securities Farmer Mac I Guaranteed Securities	Sep. 30, 2012 Farmer Mac Guaranteed Securities Farmer Mac I Guaranteed Securities	Sep. 30, 2011 Farmer Mac Guaranteed Securities Farmer Mac I Guaranteed Securities
Certain Loans Acquired in Transfer Acquired During Period [Line Items]
Number of defaulted loans								2			7	5	12	18
Unpaid prinical balance during acquisition date						$ 432	$ 0		$ 2,962	$ 13,974	$ 7,174	$ 2,921	$ 11,031	$ 21,266	$ 6,742	$ 2,921	$ 8,069	$ 7,292
Contractually required payments receivable											7,373	2,922	11,230	21,314
Impairment recognized subsequent to acquistion period	367	42	382	3,812
Recovery/release of allowance for defaulted loans	46	5	979	19
Outstanding balance	40,715		40,715		35,773
Carrying amount	$ 35,046		$ 35,046		$ 29,461