| Standard label: | Fixed Rate Residential Mortgage [Member] |
| Name: | us-gaap:FixedRateResidentialMortgageMember |
| Documentation: | Loan to purchase or refinance residential real estate such as a home, in which the real estate itself serves as collateral for the loan and in which the interest rate and the amount of each payment remain constant throughout the life of the loan. |
| 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:FixedRateResidentialMortgageMember |
| Label | Role | Language |
| Fixed Rate Residential Mortgage [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |