| Standard label: | Loans and Leases Receivable, Deferred Income |
| Name: | us-gaap:LoansAndLeasesReceivableDeferredIncome |
| Documentation: | Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LoansAndLeasesReceivableDeferredIncome |
| Label | Role | Language |
| Loans and Leases Receivable, Deferred Income | http://www.xbrl.org/2003/role/label | en-US |
| Loans and Leases Receivable, Deferred Income, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 20 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 840 30 50 4 (a)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 840 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.7) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |