| Standard label: | Grandfathered ESOP Expense Recognition, Dividends Paid to ESOP |
| Name: | us-gaap:GrandfatheredESOPExpenseRecognitionDividendsPaidToESOP |
| Documentation: | For grandfathered ESOP shares acquired prior to January 1, 1993, the dividends paid to the ESOP. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GrandfatheredESOPExpenseRecognitionDividendsPaidToESOP |
| Label | Role | Language |
| Grandfathered ESOP Expense Recognition, Dividends Paid to ESOP | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 105 10 70 2 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 105 |