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Business Concentration (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Net Premiums Written [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 14.00% | 22.60%
Texas [Member] | Geographic Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 24.80% | 32.20%
North Carolina [Member] | Geographic Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration percentage | 30.50% | 26.60%

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