cm:Level3TextBlock: us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock |
Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. |
cm:Level3TextBlock |
Text Block (HTML) (nonnum:textBlockItemType) |
For Period (duration) |
(no balance type) |
false |
us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock |
AvailableForsaleSecuritiesReconciliation |