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Loss and Loss Adjustment Expense Reserves - Supplementary information about average historical claims (Details)
Dec. 31, 2016
Private Passenger Automobile  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 68.00%
Year 2 18.00%
Year 3 6.00%
Year 4 4.00%
Year 5 2.00%
Year 6 1.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Commercial Automobile  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 51.00%
Year 2 21.00%
Year 3 8.00%
Year 4 7.00%
Year 5 5.00%
Year 6 3.00%
Year 7 1.00%
Year 8 0.00%
Year 9 0.00%
Year 10 1.00%
Homeowners  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 64.00%
Year 2 22.00%
Year 3 5.00%
Year 4 2.00%
Year 5 1.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%