Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Interest income	$ 14,951	$ 14,531	$ 14,658	$ 14,743	$ 14,452	$ 14,760	$ 14,344	$ 14,070	$ 58,883	$ 57,626	$ 57,280
Net interest income	11,733	11,305	11,458	11,520	10,951	11,077	10,320	10,038	46,016	42,385	38,803
Net income	4,146	3,661	4,010	4,285	3,199	3,336	2,432	2,389	16,102	11,356	8,068
Net income applicable to common shares	$ 4,146	$ 3,661	$ 4,010	$ 4,285	$ 3,008	$ 3,143	$ 2,239	$ 2,195	$ 16,102	$ 10,585	$ 7,293
Basic earnings per share	$ 0.39	$ 0.34	$ 0.38	$ 0.49	$ 0.39	$ 0.42	$ 0.30	$ 0.29	$ 1.56	$ 1.40	$ 0.98
Diluted earnings per share	$ 0.39	$ 0.34	$ 0.38	$ 0.41	$ 0.32	$ 0.35	$ 0.25	$ 0.25	$ 1.50	$ 1.17	$ 0.84