cm:Concept: us-gaap:EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanDescription
| Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Description |
| us-gaap:EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanDescription |
| Description of the terms of a loan made to the ESOP by a lender other than the employer, including interest rate and repayment requirements, and description of any guarantee of debt repayment made by the employer to the lender. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanDescription |