Reinsurance Activity (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2015
Multi-line excess of loss coverage
Reinsurance activity
Loss amount covered under reinsurance contract	$ 500,000
Reinsurance retention amount	500,000
Catastrophic coverage | First layer of protection
Reinsurance activity
Reinsurance retention amount	8,000,000
Reinsurance coverage in losses per event	17,000,000
Catastrophic coverage | Second layer of protection
Reinsurance activity
Loss amount covered under reinsurance contract	25,000,000
Reinsurance coverage in losses per event	25,000,000
Catastrophic coverage | Third layer of protection
Reinsurance activity
Loss amount covered under reinsurance contract	50,000,000
Reinsurance coverage in losses per event	50,000,000
Catastrophic coverage | Fourth layer of protection
Reinsurance activity
Loss amount covered under reinsurance contract	100,000,000
Reinsurance coverage in losses per event	40,000,000
ASIC | Catastrophic coverage
Reinsurance activity
Loss amount covered under reinsurance contract	6,500,000
Reinsurance retention amount	1,500,000
NLIC | Catastrophic coverage
Reinsurance activity
Reinsurance retention amount	8,000,000
NLC | Catastrophic coverage
Reinsurance activity
Loss amount covered under reinsurance contract	10,000,000
Number of layers of protection under reinsurance	4
Participation retained (as a percent)	9.00%
Retention of losses (as a percent)	9.00%
NLIC and ASIC | Catastrophic coverage
Reinsurance activity
Number of significant catastrophe experienced	1
NLIC and ASIC | Catastrophic coverage | Maximum
Reinsurance activity
Reinsurance retention amount	$ 8,000,000