Quarterly Results Of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Results Of Operations [Abstract]
Interest Income	$ 9,544	$ 9,348	$ 8,988	$ 9,098	$ 8,790	$ 8,720	$ 8,578	$ 8,526	$ 36,979	$ 34,615	$ 34,794
Interest Expense	589	563	548	545	556	555	619	641	2,245	2,371	3,180
Net interest income	8,955	8,785	8,440	8,553	8,234	8,165	7,959	7,885	34,734	32,244	31,614
Provision for loan losses	450	1,150	1,875	300	250	400	310	325	3,775	1,285	764
Other noninterest income	2,984	2,813	2,854	2,981	3,150	2,733	3,108	2,934	11,605	12,652	11,131
Securities gains (including gain on conversion)	8	(10)	2	(28)			8	718	22	8	280
Noninterest Expense	9,670	7,980	7,730	7,795	8,374	7,613	7,659	7,489	33,175	31,136	31,573
Income before income taxes	1,827	2,458	1,691	3,411	2,760	2,885	3,106	3,723	9,389	12,475	10,408
Federal income tax expense	104	383	130	685	493	306	632	839	1,302	2,271	2,006
Net income	$ 1,723	$ 2,075	$ 1,561	$ 2,726	$ 2,267	$ 2,579	$ 2,474	$ 2,884	$ 8,087	$ 10,204	$ 8,402
Basic earnings per share	$ 0.40	$ 0.48	$ 0.36	$ 0.64	$ 0.53	$ 0.61	$ 0.58	$ 0.68	$ 1.88	$ 2.40	$ 2.01
Diluted earnings per share	0.40	0.48	0.36	0.64	0.53	0.61	0.58	0.68	1.88	2.40	2.00
Dividend declared per share	$ 0.21	$ 0.21	$ 0.21	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.17	$ 0.82	$ 0.74	$ 0.68