Parent Company Only Financial Information (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 992	$ 3,723	$ 2,618	$ 3,146	$ 2,339	$ 2,216	$ 2,003	$ 1,714	$ 10,479	$ 8,272	$ 7,843
Other assets									(2,975)	(2,156)	(2,563)
Other liabilities									(1,766)	1,059	(523)
Net cash provided by operating activities									13,480	11,540	8,098
Net cash used in investing activities									(186,523)	(172,845)	(82,465)
Proceeds from issuance of common stock									14,804	499	216
Cash dividends paid									(3,819)	(3,258)	(3,049)
Purchase of Treasury stock									(342)	(80)	(210)
Net cash provided by financing activities									181,289	151,768	86,090
Net increase (decrease) in cash and equivalents									8,246	(9,537)	11,723
Beginning of year				13,084				22,621	13,084	22,621	10,898
End of year	21,330				13,084				21,330	13,084	22,621
Parent Company [Member]
Net income									10,479	8,272	7,843
Undistributed earnings of subsidiaries									(9,150)	(4,449)	(7,230)
Other assets									(13)	371	(267)
Other liabilities									(183)	(1,972)	191
Net cash provided by operating activities									1,133	2,222	537
Investment in subsidiaries									(11,791)	(250)
Net cash used in investing activities									(11,791)	(250)
Proceeds from issuance of common stock									15,015	316
Cash dividends paid									(3,819)	(2,998)	(2,765)
Purchase of Treasury stock									(342)	(80)
Net cash provided by financing activities									10,854	(2,762)	(2,765)
Net increase (decrease) in cash and equivalents									196	(790)	(2,228)
Beginning of year				$ 240				$ 1,030	240	1,030	3,258
End of year	$ 436				$ 240				$ 436	$ 240	$ 1,030