| Standard label: | Nonperforming Financial Instruments [Member] |
| Name: | us-gaap:NonperformingFinancingReceivableMember |
| Documentation: | Category status of financial instruments in which payments are past due in accordance with the terms of the contract. Financial instruments include, but are not limited to, financing receivables, loans, debt, and investments. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:NonperformingFinancingReceivableMember |
| Label | Role | Language |
| Nonperforming Financial Instruments [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 29 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 326 20 50 5 | http://www.xbrl.org/2009/role/commonPracticeRef | 326 |