| Standard label: | Financing Receivable, Covered and Not Covered, after Allowance for Credit Loss, Fee, Premium, and Discount |
| Name: | us-gaap:FinancingReceivableCoveredAndNotCoveredAfterAllowanceForCreditLossFeePremiumAndDiscount |
| Documentation: | Amount, after allowance for credit loss and unamortized deferred fee, premium, and discount, of financing receivable covered under loss sharing agreement and financing receivable not covered under loss sharing agreement. |
| 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:FinancingReceivableCoveredAndNotCoveredAfterAllowanceForCreditLossFeePremiumAndDiscount |
| Label | Role | Language |
| Financing Receivable, Covered and Not Covered, after Allowance for Credit Loss, Fee, Premium, and Discount | http://www.xbrl.org/2003/role/label | en-US |
| Financing Receivable, Covered and Not Covered, after Allowance for Credit Loss, Fee, Premium, and Discount, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 45 2 | http://www.xbrl.org/2009/role/commonPracticeRef | 310 |