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Organization of Medallion Financial Corp. and its Subsidiaries - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Medallion | Dec. 31, 2019 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |
Purchase price for City of Chicago taxi medallions out of foreclosure | $ 8,689,000 |
Number of medallions purchased out of foreclosure | Medallion | 159 |
Net realizable value of medallions | $ 2,932,000 | $ 3,091,000
Medallion Financing Trust I [Member] |  |
Subsidiary or Equity Method Investee [Line Items] |  |
Aggregate assets of trust | $ 36,083,000 |

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