| Standard label: | Derivative Asset, Fair Value, Amount Not Offset Against Collateral |
| Name: | us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
| Documentation: | Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
| Label | Role | Language |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral | http://www.xbrl.org/2003/role/label | en-US |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 20 50 3 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 210 20 55 9 | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 210 20 55 10 | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 815 10 50 8 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| Part Of Roll Up: |
| us-gaap:DerivativeFairValueOfDerivativeNet |