Reinsurance (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 01, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reimbursement Rate of Eligible Loss Adjustment Expenses Included in Retention					5.00%
Percentage of Flood Premiums Ceded	100.00%
Insurance Commissions and Fees, Flood Program	$ 188,000	$ 144,000	$ 268,000	$ 241,000
Reinsurance Costs and Recoveries, Net	3,033,000	838,000	3,226,000	1,563,000
Unaffiliated Private Reinsurers [Member] | Maximum [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Aggregate Coverage for Covered Losses Under Reinsurance Contract					360,060,000
Affiliated Entity [Member] | Catastrophe [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Coverage, Percentage Placed					100.00%
Affiliated Entity [Member] | Below Mandatory Layer [Member] | Catastrophe [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance, Losses Not Covered Prior to Coverage Beginning					20,000,000
Florida Hurricane Catastrophe Fund [Member] | Catastrophe [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance, Aggregate Value of Property Covered Under Contracts					490,600,000
Reinsurance, Losses Not Covered Prior to Coverage Beginning					187,200,000
Florida Hurricane Catastrophe Fund [Member] | Mandatory Layer [Member] | Maximum [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Coverage of Aggregate Value of Property Covered Under Contracts					90.00%
Aggregate Coverage for Covered Losses Under Reinsurance Contract					441,540,000
Unaffiliated Private Reinsurers [Member] | Below Mandatory Layer [Member] | Maximum [Member] | Catastrophe [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Aggregate Coverage for Covered Losses Under Reinsurance Contract					167,200,000
Unaffiliated Private Reinsurers [Member] | Excess-of-Loss [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Aggregate Coverage for Covered Losses Under Reinsurance Contract					$ 172,860,000
Reinsurance Coverage, Percentage Placed					100.00%