| Standard label: | Other than Securities Investment [Member] |
| Name: | us-gaap:OtherThanSecuritiesInvestmentMember |
| Documentation: | When the investment holdings table includes investments other than securities, this member categorizes all non-security investments to segregate them from security investments. |
| 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:OtherThanSecuritiesInvestmentMember |
| Label | Role | Language |
| Other than Securities Investment [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 5 (SX 210.12-12) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 320 S99 5 (SX 210.12-13.1) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |