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GUARANTEES AND COMMITMENTS - Changes in Reserve for Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning balance | $ 1,711 |
Release of losses | (69) | $ 203
Ending balance | 1,642 |
Agricultural Finance |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning balance | 1,471 | 819
Release of losses | (64) | 577
Ending balance | 1,407 | 1,396
Rural Infrastructure Finance |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning balance | 240 | 614
Release of losses | (5) | (374)
Ending balance | $ 235 | $ 240

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense related to credit loss from transactions other than loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
Name: | us-gaap_ProvisionForOtherCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=agm_AgriculturalFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=agm_RuralInfrastructureFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |