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Financial Derivatives Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |  |
TotalAmountsofLineItemsPresentedintheConsolidatedStatementofIncome | $ 115,570 | $ 123,814 | $ 115,543
Hedged Liability Discontinued Fair Value Cumulative Increase Decrease | 300 |  |
Loans [Member] |  |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |  |
Derivative, Amount of Hedged Item | 194,617 | 149,304 |
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | (5,287) | (189) |
Long-term Debt [Member] |  |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |  |
Derivative, Amount of Hedged Item | (2,021,356) | (1,552,935) |
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 8,785 | 5,836 |
Farmer Mac Guaranteed Securities: |  |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |  |
Derivative, Amount of Hedged Item | 2,882,919 | 1,928,220 |
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | $ (906) | $ (22,853) |

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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References No definition available. + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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