cm:Concept: us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities
       
          
          | Securities Borrowed Transactions and Securities Loaned Transactions, Types of Securities | 
       
       
          
          | us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities | 
       
       
          
          | This describes the types of securities (for example, government, equities, etc.) in which the entity conducts securities borrowed transactions and securities loaned transactions. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Text/String (xbrli:stringItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities |