| Standard label: | Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference |
| Name: | us-gaap:FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatusAggregatedDifference |
| Documentation: | For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are in nonaccrual status. |
| 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:FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatusAggregatedDifference |
| Label | Role | Language |
| Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 50 28 (e)(3) | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| Part Of Roll Up: |
| us-gaap:FairValueOptionLoansHeldAsAssetsAggregateDifference |