| Standard label: | Proceeds, Debt Securities, Available-for-sale, Previously Written Off, Recovery |
| Name: | us-gaap:ProceedsDebtSecuritiesAvailableForSalePreviouslyWrittenOffRecovery |
| Documentation: | Amount of cash inflow from recovery of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), previously written off. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ProceedsDebtSecuritiesAvailableForSalePreviouslyWrittenOffRecovery |
| Label | Role | Language |
| Proceeds, Debt Securities, Available-for-sale, Previously Written Off, Recovery | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 12 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |