| Standard label: | Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows |
| Name: | us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows |
| Documentation: | This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security. |
| 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:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows |
| Label | Role | Language |
| Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 320 10 50 8B (f) | http://fasb.org/us-gaap/role/ref/legacyRef | 320 |