| Standard label: | Debt Securities, Held-to-maturity, Threshold Period Past Due, Writeoff |
| Name: | us-gaap:DebtSecuritiesHeldToMaturityThresholdPeriodPastDueWriteoff |
| Documentation: | Threshold period for when investment in debt security measured at amortized cost (held-to-maturity) is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. |
| Object type: | cm:Concept |
| Data type: | xbrli:durationItemType |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DebtSecuritiesHeldToMaturityThresholdPeriodPastDueWriteoff |
| Label | Role | Language |
| Debt Securities, Held-to-maturity, Threshold Period Past Due, Writeoff | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 326 20 50 14 | http://www.xbrl.org/2009/role/commonPracticeRef | 326 |