XML 95 R81.htm IDEA: XBRL DOCUMENT v3.8.0.1
Losses And Loss Adjustment Expense Reserves - Average Annual Percentage Payout of Incurred Claims by Age (Details)
Dec. 31, 2017
Property insurance product line, automobile [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration insurance contracts, historical claims duration, year one 65.80%
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 5.00%
Short-duration insurance contracts, historical claims duration, year five 2.30%
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 0.00%
Short-duration insurance contracts, historical claims duration, year ten 0.10%
Property insurance product line, homeowners' [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration insurance contracts, historical claims duration, year one 0.00%
Short-duration insurance contracts, historical claims duration, year two 0.00%
Short-duration insurance contracts, historical claims duration, year three 0.00%
Short-duration insurance contracts, historical claims duration, year four 0.00%
Short-duration insurance contracts, historical claims duration, year five 0.00%
Short-duration insurance contracts, historical claims duration, year six 0.00%
Short-duration insurance contracts, historical claims duration, year seven 0.00%
Short-duration insurance contracts, historical claims duration, year eight 0.00%
Short-duration insurance contracts, historical claims duration, year nine 0.00%
Short-duration insurance contracts, historical claims duration, year ten 0.00%