Loan Quality And Allowance For Loan Losses (Allowance For Loan Losses, By Loan Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	$ 11,307	$ 10,318	$ 11,075	$ 10,086
Charge-offs	(46)	(818)	(118)	(2,971)
Recoveries	32	35	166	245
Provision	250	1,150	420	3,325
Allowance, Ending Balance	11,543	10,685	11,543	10,685
Loans evaluated for allowance individually					$ 12,589	$ 14,683
Loans evaluated for allowance collectively					898,914	879,190
Total Loans					911,503	893,873
Allowance established for loan evaluated collectively					11,543	11,075
Total Allowance	11,307	10,318	11,075	10,086	11,543	11,075
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans					211,121	218,783
Residential Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	281	205	224	194
Provision	(42)	8	15	19
Allowance, Ending Balance	239	213	239	213
Loans evaluated for allowance individually					469	480
Loans evaluated for allowance collectively					9,107	8,495
Total Loans					9,576	8,975
Allowance established for loan evaluated collectively					239	224
Total Allowance	281	205	224	194	239	224
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	6,052	5,940	6,109	5,649
Charge-offs	(9)	(776)	(14)	(2,730)
Recoveries	17	5	17	18
Provision	198	876	146	3,108
Allowance, Ending Balance	6,258	6,045	6,258	6,045
Loans evaluated for allowance individually					11,180	13,523
Loans evaluated for allowance collectively					392,566	377,061
Total Loans					403,746	390,584
Allowance established for loan evaluated collectively					6,258	6,109
Total Allowance	6,052	5,940	6,109	5,649	6,258	6,109
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	2,023	1,596	1,893	1,519
Charge-offs	(6)		(8)	(66)
Recoveries	5	7	111	129
Provision	(19)	132	7	153
Allowance, Ending Balance	2,003	1,735	2,003	1,735
Loans evaluated for allowance individually					190
Loans evaluated for allowance collectively					282,337	270,826
Total Loans					282,527	270,826
Allowance established for loan evaluated collectively					2,003	1,893
Total Allowance	2,023	1,596	1,893	1,519	2,003	1,893
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	100	97	100	102
Charge-offs	(31)	(42)	(83)	(126)
Recoveries	4	22	30	64
Provision	19	21	45	58
Allowance, Ending Balance	92	98	92	98
Loans evaluated for allowance collectively					4,533	4,705
Total Loans					4,533	4,705
Allowance established for loan evaluated collectively					92	100
Total Allowance	100	97	100	102	92	100
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	1,454	1,138	1,321	1,325
Provision	112	115	245	(72)
Allowance, Ending Balance	1,566	1,253	1,566	1,253
Allowance established for loan evaluated collectively					1,566	1,321
Total Allowance	1,454	1,138	1,321	1,325	1,566	1,321
First Liens [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	1,075	1,023	1,105	989
Charge-offs			(13)	(49)
Recoveries	1	1	2	34
Provision	(15)	(3)	(33)	47
Allowance, Ending Balance	1,061	1,021	1,061	1,021
Loans evaluated for allowance individually					697	628
Loans evaluated for allowance collectively					160,283	167,942
Total Loans					160,980	168,570
Allowance established for loan evaluated collectively					1,061	1,105
Total Allowance	1,075	1,023	1,105	989	1,061	1,105
Junior Liens & Lines Of Credit [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning Balance	322	319	323	308
Recoveries	5		6
Provision	(3)	1	(5)	12
Allowance, Ending Balance	324	320	324	320
Loans evaluated for allowance individually					53	52
Loans evaluated for allowance collectively					50,088	50,161
Total Loans					50,141	50,213
Allowance established for loan evaluated collectively					324	323
Total Allowance	$ 322	$ 319	$ 323	$ 308	$ 324	$ 323