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Guarantees - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Guarantor Obligations [Line Items] |  |
Minimum term of guarantees | 1 year |
Maximum term of gurantees | 30 years |
Farm & Ranch Loans and USDA Guarantees |  |
Guarantor Obligations [Line Items] |  |
Commitments to purchase | $ 125,800,000 | $ 65,100,000
Rural Utilities Loans |  |
Guarantor Obligations [Line Items] |  |
Commitments to purchase | 0 |
Guarantee and commitment obligation |  |
Guarantor Obligations [Line Items] |  |
Total off-balance sheet Farmer Mac Guaranteed Securities | 3,300,000,000 | 3,500,000,000
Guarantee obligations issued prior to January 1, 2003 |  |
Guarantor Obligations [Line Items] |  |
Total off-balance sheet Farmer Mac Guaranteed Securities | $ 10,800,000 | $ 15,500,000

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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