Investment Securities (Details Textual) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Investment Securities (Textual) [Abstract]
Proceeds from sale of investments	$ 8,000	$ 27,161,000	$ 27,200,000
Gross Realized Gain from Sale of Investment	1,000	1,276,000	1,300,000
Unrealized Loss From Investment less than 12 months	16,482,000		6,994,000
Unrealized Loss From Investment More than 12 months	44,000		52,000
Investment Securities Pledged	$ 10,000,000		$ 13,700,000