Goodwill and Intangible Assets (Details Textual) (USD $)	12 Months Ended						6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Standard Commercial Business Unit [Member]	Dec. 31, 2011 E&S Commercial Business Unit [Member]	Sep. 30, 2012 E&S Commercial Business Unit [Member] Put or Call Option [Member]	Dec. 31, 2011 General Aviation Business Unit [Member]	Dec. 31, 2011 Personal Lines Business Unit [Member]	Jul. 01, 2011 Texas Builders Insurance Company [Member]	Sep. 30, 2012 Texas Builders Insurance Company [Member]	Jul. 01, 2011 Texas Builders Insurance Company [Member] Sixteen Full Calendar Quarters [Member] Maximum [Member]	Dec. 31, 2012 Excess and Umbrella Business Unit [Member]	Aug. 29, 2008 Excess and Umbrella Business Unit [Member]	Aug. 29, 2008 Excess and Umbrella Business Unit [Member] Put or Call Option [Member]
Business Acquisition, Percentage of Voting Interests Acquired				20.00%							80.00%	20.00%
Business Combination, Consideration Transferred				$ 1,700,000							$ 15,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid							1,600,000	350,000
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable									3,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount							165,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount		$ 2,100,000	$ 19,900,000		$ 9,700,000	$ 5,300,000				$ 7,700,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years