| Standard label: | Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement |
| Name: | us-gaap:PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization |
| Documentation: | This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization |
| Label | Role | Language |
| Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 860 20 50 4 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 860 |
| Part Of Roll Up: |
| us-gaap:PrincipalAmountOutstandingOfLoansHeldInPortfolio |