Property and Casualty Unpaid Claims and Claim Expenses (Details 1)	Dec. 31, 2016
Homeowners [Member]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	76.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	18.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	2.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.10%
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%
Auto Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	41.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	34.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	13.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.10%
Auto Physical Damage [Member]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	95.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	4.90%
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%