| Standard label: | Allowance for Loan and Lease Losses, Period Increase (Decrease) |
| Name: | us-gaap:AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) of allowance reserve for credit loss. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease |
| Label | Role | Language |
| Allowance for Loan and Lease Losses, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Allowance for Loan and Lease Losses, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.7(d)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |