Quarterly Condensed Statements of Income (Schedule of Quarterly Condensed Statements of Income) (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 Information Disclosure [Abstract]
Total interest and dividend income	$ 6,169	$ 6,265	$ 6,121	$ 5,938	$ 6,051	$ 6,253	$ 6,396	$ 6,150	$ 24,493	$ 24,850	$ 25,036
Net interest income after provision for loan losses	6,117	6,354	5,494	5,408	5,252	5,773	6,191	5,372	23,373	22,588	22,451
Noninterest income	1,335	3,830	1,644	1,629	2,222	1,473	1,560	1,351	8,438	6,606	7,462
Noninterest expenses	5,774	5,518	6,131	5,058	4,844	5,333	4,966	4,843	22,481	19,986	20,367
Income before income taxes	1,678	4,666	1,007	1,979	2,630	1,913	2,785	1,880	9,330	9,208	9,546
Net income	$ 1,355	$ 3,289	$ 798	$ 1,455	$ 2,434	$ 1,385	$ 1,958	$ 1,363	$ 6,897	$ 7,140	$ 7,158
Net income per common share, basic (in US dollars per share)	$ 0.38	$ 0.94	$ 0.23	$ 0.42	$ 0.71	$ 0.40	$ 0.57	$ 0.40	$ 1.97	$ 2.08	$ 2.11
Net income per common share, diluted (in US dollars per share)	0.38	0.94	0.23	0.42	0.71	0.40	0.57	0.40	1.97	2.08	2.11
Dividends per common share (in USD per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.19	$ 0.19	$ 0.19	$ 0.80	$ 0.77	$ 0.76