| Standard label: | Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |
| Name: | us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount |
| Documentation: | Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value. |
| 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:EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount |
| Label | Role | Language |
| Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 321 10 50 3 (b) | http://www.xbrl.org/2003/role/disclosureRef | 321 |