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LOSS AND LOSS ADJUSTMENT RESERVES - (Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance) (Details)
Dec. 31, 2017
Homeowners [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 55.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 25.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 6.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%
Commercial General Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 13.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 20.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 14.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 9.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 7.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 7.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 6.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 2.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 6.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 8.80%
Personal Auto Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 45.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 35.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 8.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 1.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%