Reinsurance Activity (Details 2) (USD $)	9 Months Ended			6 Months Ended	9 Months Ended					0 Months Ended			9 Months Ended
	Sep. 30, 2013 Catastrophic coverage First layer of protection	Sep. 30, 2013 Catastrophic coverage Second layer of protection	Sep. 30, 2013 Catastrophic coverage Third layer of protection	Jun. 30, 2013 Catastrophic coverage Fourth layer of protection	Sep. 30, 2013 Catastrophic coverage Fourth layer of protection	Sep. 30, 2013 ASIC Catastrophic coverage	Sep. 30, 2013 NLIC Catastrophic coverage	Sep. 30, 2013 NLC Multi-line excess of loss coverage	Sep. 30, 2013 NLC Catastrophic coverage item	Jul. 02, 2013 NLC Catastrophic coverage Maximum	Jul. 02, 2013 NLC Catastrophic coverage Fourth layer of protection	Jul. 02, 2013 NLC Catastrophic coverage Third and fourth layer of protection	Sep. 30, 2013 NLIC and ASIC Catastrophic coverage Maximum
Reinsurance activity
Loss amount covered under reinsurance contract		$ 25,000,000	$ 50,000,000		$ 100,000,000	$ 6,500,000		$ 700,000		$ 140,000,000	$ 100,000,000
Reinsurance retention amount	8,000,000					1,500,000	8,000,000	300,000					8,000,000
Number of layers of protection under reinsurance									4
Reinsurance coverage in losses per event	$ 17,000,000	$ 25,000,000	$ 50,000,000	$ 70,000,000	$ 40,000,000						$ 40,000,000
Renewal period of reinsurance contract												2 years