| Standard label: | Deferred Policy Acquisition Costs, Amortization Expense, Accrued Interest |
| Name: | us-gaap:DeferredPolicyAcquisitionCostsAmortizationExpenseAccruedInterest |
| Documentation: | Amount of amortization expense for deferred policy acquisition costs from accrued interest on unamortized balance. |
| 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:DeferredPolicyAcquisitionCostsAmortizationExpenseAccruedInterest |
| Label | Role | Language |
| Deferred Policy Acquisition Costs, Amortization Expense, Accrued Interest | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 30 50 1 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| FASB Accounting Standards Codification 944 30 35 7 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |