| Standard label: | US Government-sponsored Enterprises Debt Securities [Member] |
| Name: | us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
| Documentation: | Debentures, bonds and other debt securities issued by US government sponsored entities (GSEs), for example, but not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB). Excludes debt issued by the Government National Mortgage Association (GNMA or Ginnie Mae). |
| 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:USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
| Label | Role | Language |
| US Government-sponsored Enterprises Debt Securities [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (d)(ii) | http://www.xbrl.org/2009/role/commonPracticeRef | 715 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03(6)(a)(1)) | http://www.xbrl.org/2003/role/disclosureRef | 942 |