| Standard label: | Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |
| Name: | us-gaap:ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |
| Documentation: | Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |
| Label | Role | Language |
| Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 15 (c)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 10 50 17 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| Part Of Roll Up: |
| us-gaap:ImpairedFinancingReceivableAverageRecordedInvestment |