| Standard label: | Leveraged Leases, Income Statement, Income from Leveraged Leases |
| Name: | us-gaap:LeveragedLeasesIncomeStatementIncomeFromLeveragedLeases |
| Documentation: | Pretax lease income allocated in proportionate amounts from unearned income. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LeveragedLeasesIncomeStatementIncomeFromLeveragedLeases |
| Label | Role | Language |
| Leveraged Leases, Income Statement, Income from Leveraged Leases | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 840 30 45 5 | http://www.xbrl.org/2003/role/disclosureRef | 840 |
| FASB Accounting Standards Codification 842 50 45 1 | http://www.xbrl.org/2003/role/disclosureRef | 842 |
| Part Of Roll Up: |
| us-gaap:LeveragedLeasesIncomeStatementNetIncomeFromLeveragedLeases |