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Organization of Medallion Financial Corp. and its Subsidiaries - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Medallion
Dec. 31, 2021
USD ($)
Subsidiary or Equity Method Investee [Line Items]    
Purchase price for City of Chicago taxi medallions out of foreclosure $ 8.7  
Number of medallions purchased out of foreclosure | Medallion 159  
Net realizable value of medallions $ 1.0 $ 1.0
Medallion Financing Trust I [Member]    
Subsidiary or Equity Method Investee [Line Items]    
Aggregate assets of trust $ 34.0