| Standard label: | Deferred Policy Acquisition Costs, Amortization Expense |
| Name: | us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense |
| Documentation: | Amount of amortization expense (reversal of expense) for deferred policy acquisition costs. |
| 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:DeferredPolicyAcquisitionCostAmortizationExpense |
| Label | Role | Language |
| Deferred Policy Acquisition Costs, Amortization Expense | http://www.xbrl.org/2003/role/label | en-US |
| Deferred Policy Acquisition Costs, Amortization Expense, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 944 20 45 2 (d) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(7)(a)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 30 50 2B (a) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 30 50 1 (c) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 30 55 2 | http://www.xbrl.org/2003/role/exampleRef | 944 |
| FASB Accounting Standards Codification 944 40 65 2 (g)(1) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| Part Of Roll Up: |
| us-gaap:CostOfRevenue |
| us-gaap:AdjustmentForAmortization |