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Guarantees - Reserve For Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |
Reserve for losses | $ 2,333 | $ 3,277 |  |
Farm & Ranch |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for losses | 1,366 | 2,097 | $ 2,020 | $ 2,164
Rural Utilities |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for losses | 967 | 1,180 | $ 1,400 | $ 0
LTSPCs and Farmer Mac Guaranteed Securities | Farm & Ranch |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for losses | 1,366 | 2,097 |  |
LTSPCs | Rural Utilities |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for losses | $ 967 | $ 1,180 |  |

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- Definition The reserve for guarantee losses is a liability account in the consolidated balance sheets that reflects an estimate of incurred credit losses related to the guaranty of unconsolidated trusts and other credit guarantees + References No definition available. + Details
Name: | agm_ReserveForLosses
Namespace Prefix: | agm_
Data Type: | xbrli:monetaryItemType
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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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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