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Guarantees and Commitments - Reserve For Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |  |  |
Reserve for losses | $ 1,677 |  | $ 1,950 |  |  |
Agricultural Finance |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Reserve for losses | 882 | $ 993 | 1,068 | $ 1,194 | $ 1,366 | $ 2,097
Rural Infrastructure Finance |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Reserve for losses | 795 | $ 847 | 882 | $ 917 | $ 967 | $ 1,180
LTSPCs and Farmer Mac Guaranteed Securities | Agricultural Finance |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Reserve for losses | 882 |  | 1,068 |  |  |
LTSPCs | Rural Infrastructure Finance |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Reserve for losses | $ 795 |  | $ 882 |  |  |

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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
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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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- Details
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- Details
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- Details
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- Details
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