Quarterly Financial Information (Unaudited) (Schedule Of Quarterly Financial Information) (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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information (Unaudited) [Abstract]
Interest income	$ 7,038	$ 7,006	$ 6,715	$ 6,736	$ 6,660	$ 6,612	$ 6,438	$ 6,304	$ 6,402	$ 6,295	$ 6,145	$ 6,002	$ 27,495	$ 26,014	$ 24,844
Interest expense	(601)	(585)	(574)	(598)	(605)	(580)	(647)	(697)	(759)	(730)	(721)	(707)	(2,358)	(2,529)	(2,917)
Net interest income	6,437	6,421	6,141	6,138	6,055	6,032	5,791	5,607	5,643	5,565	5,424	5,295	25,137	23,485	21,927
Provision for loan losses	(375)	(225)	(275)	(150)	(575)	(200)	(150)	(150)	(250)	(210)	(300)	(300)	(1,025)	(1,075)	(1,060)
Gain on sale and recovery of investment securities			9		54	8	16	2	298		94	207	9	80	599
Other income	2,194	2,024	2,091	1,687	1,873	2,015	1,817	1,748	1,749	1,748	1,727	1,531	7,996	7,453	6,755
Other expenses	(5,489)	(5,409)	(5,369)	(5,388)	(4,952)	(5,239)	(5,744)	(5,087)	(5,247)	(4,910)	(4,761)	(4,785)	(21,655)	(21,022)	(19,703)
Income before taxes	2,767	2,811	2,597	2,287	2,455	2,616	1,730	2,120	2,193	2,193	2,184	1,948	10,462	8,921	8,518
Provision for income taxes	(738)	(776)	(669)	(586)	(634)	(687)	50	(547)	(555)	(562)	(557)	(492)	(2,769)	(1,818)	(2,166)
Net income	$ 2,029	$ 2,035	$ 1,928	$ 1,701	$ 1,821	$ 1,929	$ 1,780	$ 1,573	$ 1,638	$ 1,631	$ 1,627	$ 1,456	$ 7,693	$ 7,103	$ 6,352
Net income per share - basic	$ 0.83	$ 0.83	$ 0.79	$ 0.69	$ 0.74	$ 0.79	$ 0.73	$ 0.65	$ 0.67	$ 0.68	$ 0.67	$ 0.61	$ 3.14	$ 2.91	$ 2.63
Net income per share - diluted	$ 0.83	$ 0.82	$ 0.79	$ 0.69	$ 0.74	$ 0.79	$ 0.73	$ 0.64	$ 0.67	$ 0.67	$ 0.67	$ 0.61	$ 3.13	$ 2.90	$ 2.62