Selected Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Selected Quarterly Financial Data [Abstract]
Interest income	$ 8,409	$ 8,309	$ 8,289	$ 8,369	$ 8,518	$ 8,169	$ 8,015	$ 8,013	$ 33,377	$ 32,715	$ 31,417
Interest expense	1,309	1,364	1,408	1,516	1,627	1,655	1,728	1,716	5,597	6,727	6,922
NET INTEREST INCOME	7,100	6,945	6,881	6,853	6,891	6,514	6,287	6,297	27,780	25,988	24,495
Net income	$ 2,122	$ 2,136	$ 1,495	$ 2,379	$ 1,338	$ 1,926	$ 972	$ 1,875
Earnings per share basic	$ 0.51	$ 0.51	$ 0.36	$ 0.58	$ 0.33	$ 0.47	$ 0.24	$ 0.46	$ 1.96	$ 1.49	$ 1.34
Earnings per share diluted	$ 0.51	$ 0.51	$ 0.36	$ 0.58	$ 0.33	$ 0.47	$ 0.24	$ 0.46	$ 1.95	$ 1.49	$ 1.34