Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	$ 21,878	$ 23,235
Less than 12 months, Unrealized Losses	226	997
More than 12 months, Fair Value	1,857	541
More than 12 months, Unrealized Losses	137	21
U.S. Treasury securities and obligations of U.S. government corporations and agencies [Member]
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	1,771
Less than 12 months, Unrealized Losses	11
More than 12 months, Fair Value
More than 12 months, Unrealized Losses
Obligations of states and political subdivisions [Member]
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	3,547	1,638
Less than 12 months, Unrealized Losses	62	17
More than 12 months, Fair Value		540
More than 12 months, Unrealized Losses		21
Corporate securities [Member]
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	3,665	10,101
Less than 12 months, Unrealized Losses	25	528
More than 12 months, Fair Value	1,851
More than 12 months, Unrealized Losses	137
Residential mortgage-backed securities [Member]
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	12,359	7,412
Less than 12 months, Unrealized Losses	105	44
More than 12 months, Fair Value	6	1
More than 12 months, Unrealized Losses
Equity securities [Member]
Summary of fixed maturities and equity securities with unrealized losses
Less than 12 months, Fair Value	536	4,084
Less than 12 months, Unrealized Losses	23	408
More than 12 months, Fair Value
More than 12 months, Unrealized Losses