| Standard label: | Compensation and Employee Benefit Plans, Other than Share-based Compensation [Text Block] |
| Name: | us-gaap:CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationTextBlock |
| Documentation: | The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. |
| Object type: | cm:Level1TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationTextBlock |
| Examples of this text block disclosure: | CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationDisclosure |
| Label | Role | Language |
| Compensation and Employee Benefit Plans, Other than Share-based Compensation [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 710 | http://fasb.org/us-gaap/role/ref/legacyRef | 710 |
| FASB Accounting Standards Codification 712 | http://fasb.org/us-gaap/role/ref/legacyRef | 712 |
| FASB Accounting Standards Codification 715 | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |