cm:Concept: us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent
       
          
          | Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Current | 
       
       
          
          | us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent | 
       
       
          
          | The current portion of the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Credit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent |