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Reinsurance (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
Covering certain loss occurrences including hurricanes | $ 2,700,000 |
Reinsurance and Insurance Operations (Additional Textual) [Abstract] |  |
In-force policyholder coverage for windstorm exposures | 127,000,000,000 |
Percentage of premium ceded | 45.00% | 50.00%
Percentage reduction of premium ceded | 5.00% |
Maximum catastrophic event pre-tax liability retained T25 arrangement | 91,500,000 |
Maximum catastrophic event losses T25 arrangement | 1,733,000,000 |
Aggregate premium installment payments T25 arrangement | 72,981,000 |
Option One [Member] |  |
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
Covering certain loss occurrences including hurricanes | 75,000,000 |
Option One [Member] | Minimum [Member] |  |
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess | 45.00% |
Covering certain loss occurrences including hurricanes | 75,000,000 |
Option Two [Member] |  |
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
Covering certain loss occurrences including hurricanes | 105,000,000 |
Option Two [Member] | Minimum [Member] |  |
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
Covering certain loss occurrences including hurricanes | $ 45,000,000 |
Option Two [Member] | Maximum [Member] |  |
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess | 55.00% |

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