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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance) (Details) - Homeowners [Member]
Dec. 31, 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 53.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 28.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 7.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 4.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%