Loans and Allowance for Loan Losses (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Loans and Allowance for Loan Losses (Textual) [Abstract]
Total loans	$ 1,035,288,000	$ 1,094,037,000	$ 1,035,288,000	$ 1,094,037,000	$ 1,072,422,000
Amount of decrease in total loans			37,100,000
Accrued troubled debt restructurings included in nonperforming loans	0		0		0
Percentage decrease in total loans			3.50%
Interest income recognized on impaired loans	400,000	100,000	1,100,000	100,000
Number of past due days for loans modified as TDR			30 days
Purchases of loans not held-for-sale	0	0	0	0
Sales of loans not held-for-sale	0	0	0	0
Reclassifications of loans held-for-sale	$ 0	$ 0	$ 0	$ 0