Selected Condensed Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of selected quarterly financial information
Interest income	$ 9,363	$ 9,100	$ 8,912	$ 8,743	$ 8,817	$ 8,790	$ 8,534	$ 8,557	$ 36,118	$ 34,698	$ 35,142
Interest expense	1,714	1,737	1,782	1,865	2,037	2,082	2,156	2,428	7,097	8,702	11,854
Net interest income	7,649	7,363	7,130	6,878	6,780	6,708	6,378	6,129	29,021	25,996	23,288
Provision for loan losses	825	775	750	1,125	950	1,125	1,275	1,200	3,475	4,550	5,270
Noninterest income	987	1,055	878	882	897	1,286	741	837	3,802	3,762	2,770
Noninterest expenses	5,771	5,510	5,301	5,230	5,053	5,025	4,655	4,779	21,812	19,513	17,867
Income before income tax expense	2,040	2,133	1,957	1,405	1,674	1,844	1,189	987	7,536	5,695	2,921
Income tax expense	601	714	657	444	541	618	374	299	2,416	1,833	833
Net income	1,439	1,419	1,300	961	1,133	1,226	815	688	5,120	3,862	2,088
Preferred stock dividend	191	191	191	197	204	204	216	216	771	840	865
Discount accretion						180	106	73		360	279
Redemption of preferred stock				20			96		(980)	(904)
Net income available to common shareholders	$ 1,248	$ 1,228	$ 1,109	$ 784	$ 929	$ 842	$ 589	$ 399	$ 4,369	$ 2,758	$ 944
Earnings per common share
Basic	$ 0.29	$ 0.29	$ 0.26	$ 0.18	$ 0.22	$ 0.20	$ 0.14	$ 0.09	$ 1.02	$ 0.65	$ 0.22
Diluted	$ 0.27	$ 0.27	$ 0.25	$ 0.18	$ 0.22	$ 0.19	$ 0.13	$ 0.09	$ 0.98	$ 0.64	$ 0.22
Weighted average common shares outstanding
Basic	4,316,890	4,271,652	4,269,097	4,262,330	4,241,280	4,229,819	4,225,993	4,222,622	4,279,992	4,229,928	4,200,980
Diluted	4,551,182	4,490,026	4,423,141	4,371,324	4,305,127	4,349,971	4,436,920	4,267,813	4,458,918	4,339,958	4,286,418