Investments (Details Textuals) (USD $)	12 Months Ended
	Dec. 31, 2012
Investment [Abstract]
Fair value of held to maturity securities transferred	$ 139,100,000
Amortized cost of held to maturity securities transferred	136,000,000
Net unrealized appreciation, net of tax, increase in AOCI & SHE from transfer	2,000,000
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	200,000
Gross unrealized losses on fixed income securities	9,500,000
Weighted-average life of mortgage-backed and asset-backed securities, Years	5.5
Domestic insurance companies deposited fixed income securities (at fair value) required by state insurance departments.	44,200,000
Domestic insurance companies deposited fixed income securities (at amortized cost) required by state insurance departments.	$ 42,400,000
Senior note, effective interest rate	6.37%