Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per 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
Quarterly Financial Data [Abstract]
Interest income	$ 14,452	$ 14,760	$ 14,344	$ 14,070	$ 14,359	$ 1,045	$ 14,308	$ 14,568	$ 57,626	$ 57,280	$ 63,884
Net interest income	10,951	11,077	10,320	10,038	10,003	9,538	9,504	9,758	42,385	38,803	39,820
Net income	3,199	3,336	2,432	2,389	2,788	2,272	1,216	1,792	11,356	8,068	5,713
Net income applicable to common shares	$ 3,008	$ 3,143	$ 2,239	$ 2,195	$ 2,594	$ 2,078	$ 1,023	$ 1,598	$ 10,585	$ 7,293	$ 4,936
Basic earnings per share	$ 0.39	$ 0.42	$ 0.30	$ 0.29	$ 0.35	$ 0.28	$ 0.14	$ 0.22	$ 1.40	$ 0.98	$ 0.66
Diluted earnings per share	$ 0.32	$ 0.35	$ 0.25	$ 0.25	$ 0.29	$ 0.24	$ 0.13	$ 0.19	$ 1.17	$ 0.84	$ 0.60