| Standard label: | Loans and Leases Receivable, Allowance |
| Name: | us-gaap:LoansAndLeasesReceivableAllowance |
| Documentation: | Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance 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:LoansAndLeasesReceivableAllowance |
| Label | Role | Language |
| Loans and Leases Receivable, Allowance | http://www.xbrl.org/2003/role/label | en-US |
| Loans and Leases Receivable, Allowance, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Loans and Leases Receivable, Allowance, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Loans and Leases Receivable, Allowance, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 11B (c)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 10 50 11B (g) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 10 S99 4 (SAB Topic 6.L.1) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 30 50 2 (b)(1)(ii) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.7(d)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |