| Standard label: | Fair Value, Concentration of Risk, Disclosure Items [Domain] |
| Name: | us-gaap:FairValueConcentrationOfRiskDisclosureItemsDomain |
| Documentation: | Provides the general information items required or determined to be disclosed with respect to all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FairValueConcentrationOfRiskDisclosureItemsDomain |
| Label | Role | Language |
| Fair Value, Concentration of Risk, Disclosure Items [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 50 21 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| FASB Accounting Standards Codification 825 10 50 22 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| FASB Accounting Standards Codification 825 10 50 23 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |