Selected Condensed Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of selected quarterly financial information
Interest income	$ 10,560	$ 10,253	$ 9,790	$ 9,344	$ 9,363	$ 9,100	$ 8,912	$ 8,743	$ 39,948	$ 36,118	$ 34,698
Interest expense	1,726	1,762	1,720	1,700	1,714	1,737	1,782	1,865	6,908	7,097	8,702
Net interest income	8,834	8,491	8,070	7,644	7,649	7,363	7,130	6,878	33,040	29,021	25,996
Provision for loan losses	900	1,325	950	1,000	825	775	750	1,125	4,175	3,475	4,550
Noninterest income	1,733	1,560	1,518	969	987	1,055	878	882	5,780	3,802	3,762
Noninterest expenses	6,756	6,066	6,315	5,769	5,771	5,510	5,301	5,230	24,907	21,812	19,513
Income before income tax expense	2,911	2,660	2,323	1,844	2,040	2,133	1,957	1,405	9,738	7,536	5,695
Income tax expense	928	834	757	594	601	714	657	444	3,113	2,416	1,833
Net income	1,983	1,826	1,566	1,250	1,439	1,419	1,300	961	6,625	5,120	3,862
Preferred stock dividends	217	253	253	193	191	191	191	197	915	771	840
Add: Redemption of preferred stock								20		20	96
Net income available to common shareholders	$ 1,766	$ 1,573	$ 1,313	$ 1,057	$ 1,248	$ 1,228	$ 1,109	$ 784	$ 5,710	$ 4,369	$ 2,758
Earnings per common share
Basic	$ 0.32	$ 0.33	$ 0.28	$ 0.23	$ 0.29	$ 0.29	$ 0.26	$ 0.18	$ 1.15	$ 1.02	$ 0.65
Diluted	$ 0.30	$ 0.31	$ 0.26	$ 0.22	$ 0.27	$ 0.27	$ 0.25	$ 0.18	$ 1.10	$ 0.98	$ 0.64
Weighted average common shares outstanding
Basic	5,586,620	4,829,514	4,825,588	4,672,270	4,316,890	4,271,652	4,269,097	4,262,330	4,980,595	4,279,992	4,229,928
Diluted	5,835,002	5,046,487	5,029,724	4,877,448	4,551,182	4,490,026	4,423,141	4,371,324	5,199,376	4,458,918	4,339,958