| Standard label: | Cash |
| Name: | us-gaap:Cash |
| Documentation: | Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:Cash |
| Label | Role | Language |
| Cash | http://www.xbrl.org/2003/role/label | en-US |
| Cash, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Cash, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.1) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 946 210 45 20 | http://www.xbrl.org/2003/role/disclosureRef | 946 |
| FASB Accounting Standards Codification 946 210 45 21 | http://www.xbrl.org/2003/role/disclosureRef | 946 |
| Part Of Roll Up: |
| us-gaap:CashAndDueFromBanks |