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Losses And Loss Adjustment Expense Reserves - Average Annual Percentage Payout of Incurred Claims by Age (Details)
Dec. 31, 2016
Property insurance product line, automobile [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration insurance contracts, historical claims duration, year one 66.00%
Short-duration insurance contracts, historical claims duration, year two 17.10%
Short-duration insurance contracts, historical claims duration, year three 8.50%
Short-duration insurance contracts, historical claims duration, year four 4.90%
Short-duration insurance contracts, historical claims duration, year five 2.20%
Short-duration insurance contracts, historical claims duration, year six 0.70%
Short-duration insurance contracts, historical claims duration, year seven 0.40%
Short-duration insurance contracts, historical claims duration, year eight 0.10%
Short-duration insurance contracts, historical claims duration, year nine 0.10%
Short-duration insurance contracts, historical claims duration, year ten 0.00%
Property insurance product line, homeowners' [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration insurance contracts, historical claims duration, year one 66.10%
Short-duration insurance contracts, historical claims duration, year two 24.30%
Short-duration insurance contracts, historical claims duration, year three 4.60%
Short-duration insurance contracts, historical claims duration, year four 3.00%
Short-duration insurance contracts, historical claims duration, year five 1.00%
Short-duration insurance contracts, historical claims duration, year six 0.70%
Short-duration insurance contracts, historical claims duration, year seven 0.20%
Short-duration insurance contracts, historical claims duration, year eight 0.00%
Short-duration insurance contracts, historical claims duration, year nine 0.10%
Short-duration insurance contracts, historical claims duration, year ten 0.00%