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Guarantees - Schedule of Underlying Off-Balance Sheet Guaranteed Securities (Details) - Farmer Mac Guaranteed Securities - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019
Guarantor Obligations [Line Items] |  |
Guarantee and commitment obligation | $ 2,080 | $ 2,230
Weighted-average remaining maturity | 9 years 8 months 12 days | 9 years 9 months 18 days
Institutional Credit |  |
Guarantor Obligations [Line Items] |  |
Weighted-average remaining maturity | 4 years 8 months 12 days | 5 years

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- Definition Weighted average remaining maturity, Loans underlying guarantees not held by transferor + References No definition available. + Details
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Namespace Prefix: | agm_
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Balance Type: | na
Period Type: | duration

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |