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LOSS AND LOSS ADJUSTMENT RESERVES - (Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance) (Details)
Dec. 31, 2018
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 57.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 23.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 5.70%
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 2.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.10%
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 14.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 18.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 18.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 9.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 7.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 6.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 7.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 4.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 9.60%
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 41.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 32.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 16.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.50%
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%