| Standard label: | Debt Securities, Held-to-maturity, Threshold Period Past Due |
| Name: | us-gaap:DebtSecuritiesHeldToMaturityThresholdPeriodPastDue |
| Documentation: | Threshold period for when investment in debt security measured at amortized cost (held-to-maturity) is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible. |
| 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:DebtSecuritiesHeldToMaturityThresholdPeriodPastDue |
| Label | Role | Language |
| Debt Securities, Held-to-maturity, Threshold Period Past Due | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 326 20 50 14 | http://www.xbrl.org/2003/role/disclosureRef | 326 |