| Standard label: | Restrictions on Cash and Cash Equivalents [Table Text Block] |
| Name: | us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock |
| Documentation: | Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. |
| Object type: | cm:Level3TextBlock |
| 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:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock |
| Examples of this text block disclosure: | RestrictedCashAndCashEquivalents |
| Label | Role | Language |
| Restrictions on Cash and Cash Equivalents [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 230 10 50 8 | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03(1)(a)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03(a)(2)) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |