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Financial Derivatives - Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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HedgedItemsinFairValueHedgingRelationship [Line Items] |  |
Hedging adjustments on discontinued hedging relationships | $ 200 | $ 300
Loans [Member] |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |
Carrying Amount of Hedged Assets/(Liabilities) | 726,169 | 194,617
Cumulative Amount of Fair Value Hedging Adjustments included in the Carrying Amount of the Hedged Assets/(Liabilities) | 8,968 | (5,287)
Other Assets [Member] |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |
Carrying Amount of Hedged Assets/(Liabilities) | 1,981 | 0
Cumulative Amount of Fair Value Hedging Adjustments included in the Carrying Amount of the Hedged Assets/(Liabilities) | 1,981 | 0
Long-term Debt [Member] |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |
Carrying Amount of Hedged Assets/(Liabilities) | (2,103,633) | (2,021,356)
Cumulative Amount of Fair Value Hedging Adjustments included in the Carrying Amount of the Hedged Assets/(Liabilities) | 541 | 8,785
Farmer Mac Guaranteed Securities [Member] |  |
HedgedItemsinFairValueHedgingRelationship [Line Items] |  |
Carrying Amount of Hedged Assets/(Liabilities) | 3,360,615 | 2,882,919
Cumulative Amount of Fair Value Hedging Adjustments included in the Carrying Amount of the Hedged Assets/(Liabilities) | $ 58,445 | $ (906)

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- Definition [Line Items] for HedgedItemsinFairValueHedgingRelationship [Table] + References No definition available. + 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, 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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