| Standard label: | Proceeds from Maturities, Prepayments and Calls of Short-term Investments |
| Name: | us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments |
| Documentation: | The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments |
| Label | Role | Language |
| Proceeds from Maturities, Prepayments and Calls of Short-term Investments | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 12 | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 230 10 45 13 | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |