cm:Member: us-gaap:InterestRateFloorMember
| Interest Rate Floor [Member] |
| us-gaap:InterestRateFloorMember |
| Contracts in which the floor writer, in return for a premium, agrees to limit the risk associated with a decline in interest rates based on a notional amount. If rates fall below an agreed rate, the floor holder will receive cash payments from the floor writer equal to the difference between the market rate and an agreed rate multiplied by the notional principal amount. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:InterestRateFloorMember |