Investments (Details Textuals) (USD $)	6 Months Ended
	Jun. 30, 2011
Investment [Abstract]
Condition for categorizing the impaired securities	$ 500,000
Condition for categorizing the impaired securities, percentage	10.00%
Other-than-temporary impairments related to mortgage backed securities, after tax	900,000
Gross unrealized losses on fixed income securities	$ (16,374,000)
Weighted-average life of mortgage-backed and asset-backed securities, Years	4.9