Property and Equipment (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and Equipment (Textual)
Depreciation and amortization expense	$ 979,000	$ 884,000	$ 853,000
Building [Member]
Property and Equipment (Textual)
Increase in property and equipment	1,100,000
Leasehold Improvements [Member]
Property and Equipment (Textual)
Increase in property and equipment	506,000
Furniture and equipment [Member]
Property and Equipment (Textual)
Increase in property and equipment	$ 708,000