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ORGANIZATION, CONSOLIDATION AND BASIS OF PRESENTATION (Narrative) (Details) - Premiums Written Net - Homeowners Multiperil Insurance Product Line - Customer Concentration Risk
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Ivantage Select Agency Inc        
Organization, Consolidation, And Basis of Preparation [Line Items]        
Concentration risk, percentage 23.60% 24.50% 23.50% 23.90%
SageSure Insurance Managers LLC        
Organization, Consolidation, And Basis of Preparation [Line Items]        
Concentration risk, percentage 25.20% 16.20% 22.40% 14.20%