| Standard label: | Debt Securities, Available-for-sale, Maturity Date |
| Name: | us-gaap:DebtSecuritiesAvailableForSaleMaturityDate |
| Documentation: | Maturity date of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in CCYY-MM-DD format. |
| Object type: | cm:Concept |
| Data type: | Date (xbrli:dateItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DebtSecuritiesAvailableForSaleMaturityDate |
| Label | Role | Language |
| Debt Securities, Available-for-sale, Maturity Date | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 820 10 50 2 (bbb)(2) | http://www.xbrl.org/2009/role/commonPracticeRef | 820 |