| Standard label: | Impaired Financing Receivable, Unpaid Principal Balance |
| Name: | us-gaap:ImpairedFinancingReceivableUnpaidPrincipalBalance |
| Documentation: | Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. |
| 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:ImpairedFinancingReceivableUnpaidPrincipalBalance |
| Label | Role | Language |
| Impaired Financing Receivable, Unpaid Principal Balance | http://www.xbrl.org/2003/role/label | en-US |
| Impaired Financing Receivable, Unpaid Principal Balance, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 15 (a)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |