| Standard label: | Repurchase Agreements, Valuation, Policy [Policy Text Block] |
| Name: | us-gaap:RepurchaseAgreementsValuationPolicy |
| Documentation: | Disclosure of the accounting policy for determining which carrying amount is used for securities sold under repurchase agreements and the method used to determine that amount. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RepurchaseAgreementsValuationPolicy |
| Label | Role | Language |
| Repurchase Agreements, Valuation, Policy [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 25 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| FASB Accounting Standards Codification 825 10 50 28 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03(6)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |