| Standard label: | Preferred Stock Redemption Premium |
| Name: | us-gaap:PreferredStockRedemptionPremium |
| Documentation: | The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. |
| 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:PreferredStockRedemptionPremium |
| Label | Role | Language |
| Preferred Stock Redemption Premium | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 260 10 S99 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 260 |
| Part Of Roll Up: |
| us-gaap:PreferredStockDividendsAndOtherAdjustments |
| us-gaap:StockholdersEquityPeriodIncreaseDecrease |