| Standard label: | Fair Value, Option, Credit Risk, Gains (Losses) on Assets |
| Name: | us-gaap:FairValueOptionCreditRiskGainsLossesOnAssets |
| Documentation: | This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FairValueOptionCreditRiskGainsLossesOnAssets |
| Label | Role | Language |
| Fair Value, Option, Credit Risk, Gains (Losses) on Assets | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 50 30 (c)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |