Investment Securities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investment Securities (Textual) [Abstract]
Total fair value of investments securities, less than historical cost	$ 7,112,000		$ 2,605,000
Total fair value of investments securities, less than historical cost, percentage of portfolio	18.90%		6.30%
Investment securities pledged to secure a repurchase	9,320,000		9,185,000
Gross gain resulting from sales of available-for-sale securities	92,000	89,000
Net tax expense resulting from sales of available-for-sale securities	$ 31,000	$ 30,000