| Standard label: | Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due |
| Name: | us-gaap:FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue |
| Documentation: | This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. |
| 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:FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue |
| Label | Role | Language |
| Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 50 28 (e)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |