Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value	$ 26,823	$ 5,518
12 months or longer, Fair value	212	2,951
Less than 12 months, Gross Unrealized Losses	(272)	(192)
12 months or longer, Total Gross Unrealized Losses	(78)	(202)
Gross Unrealized Losses	(350)	(394)
U.S. government and agencies [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value
12 months or longer, Fair value
Less than 12 months, Gross Unrealized Losses
12 months or longer, Total Gross Unrealized Losses
Gross Unrealized Losses
State [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value
12 months or longer, Fair value
Less than 12 months, Gross Unrealized Losses
12 months or longer, Total Gross Unrealized Losses
Gross Unrealized Losses
Political subdivisions [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value
12 months or longer, Fair value
Less than 12 months, Gross Unrealized Losses
12 months or longer, Total Gross Unrealized Losses
Gross Unrealized Losses
Revenue and assessment [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value	702
Less than 12 months, Gross Unrealized Losses	(6)
Gross Unrealized Losses	(6)
Corporate bonds [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value	25,997	4,451
12 months or longer, Fair value		1,849
Less than 12 months, Gross Unrealized Losses	(246)	(174)
12 months or longer, Total Gross Unrealized Losses		(34)
Gross Unrealized Losses	(246)	(208)
Non-agency backed - residential [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value	124	898
12 months or longer, Fair value	212	614
Less than 12 months, Gross Unrealized Losses	(20)	(11)
12 months or longer, Total Gross Unrealized Losses	(78)	(156)
Gross Unrealized Losses	(98)	(167)
Non-agency backed - commercial [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
12 months or longer, Fair value		488
12 months or longer, Total Gross Unrealized Losses		(12)
Gross Unrealized Losses		(12)
Mutual Fund [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value
12 months or longer, Fair value
Less than 12 months, Gross Unrealized Losses
12 months or longer, Total Gross Unrealized Losses
Gross Unrealized Losses
Agency backed [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value
12 months or longer, Fair value
Less than 12 months, Gross Unrealized Losses
12 months or longer, Total Gross Unrealized Losses
Gross Unrealized Losses
Redeemable preferred stock [Member]
Fair value and gross unrealized losses of investments, available-for-sale, by the length of time
Less than 12 months, Fair value		169
Less than 12 months, Gross Unrealized Losses		(7)
Gross Unrealized Losses		$ (7)