Benefit Plan (Details) (USD $)	1 Months Ended		12 Months Ended
	Oct. 31, 2012	Jan. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Benefit Plan (Textual) [Abstract]
Matching contribution to benefits plan	4.00%	3.00%	100.00%	2.00%
Employee matching contribution			50.00%
Contribution compensation maximum			5.00%
Expenses on contribution charged			$ 391,000	$ 160,000	$ 0
Interest expense related to Board of Directors deferred compensation plan			13,000	17,000	19,000
Interest expense related to officer non-qualified deferred compensation program			$ 32,000	$ 36,000	$ 40,000
Number of shares of common stock issuable under employee stock purchase plan of 2002			55,000
Number of shares issued under employee stock purchase plan			2,400	4,726
Number of shares available under employee stock purchase plan			5,040