Allowance for Loan Losses (Allowance for Loan Losses By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 4,411	$ 4,505	$ 4,959
Charge-Offs	(236)	(370)	(607)
Recoveries	504	901	341
Provision for (recovery of) loan losses	777	(625)	(188)
Ending Balance	5,456	4,411	4,505
Ending balance: Individually evaluated for impairment	962	458	385
Ending balance: collectively evaluated for impairment	4,494	3,953	4,120
Loans: Ending balance	607,315	569,238	517,125
Ending balance individually evaluated for impairment	8,559	11,426	13,380
Ending balance collectively evaluated for impairment	598,756	557,812	503,745
Construction And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	332	450	775
Charge-Offs	0	(19)	0
Recoveries	266	535	144
Provision for (recovery of) loan losses	(15)	(634)	(469)
Ending Balance	583	332	450
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	583	332	450
Loans: Ending balance	61,926	52,354	31,791
Ending balance individually evaluated for impairment	280	315	1,320
Ending balance collectively evaluated for impairment	61,646	52,039	30,471
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,754	1,992	2,322
Charge-Offs	(24)	(55)	(535)
Recoveries	28	212	124
Provision for (recovery of) loan losses	30	(395)	81
Ending Balance	1,788	1,754	1,992
Ending balance: Individually evaluated for impairment	119	195	268
Ending balance: collectively evaluated for impairment	1,669	1,559	1,724
Loans: Ending balance	229,784	227,305	231,532
Ending balance individually evaluated for impairment	4,044	8,315	8,608
Ending balance collectively evaluated for impairment	225,740	218,990	222,924
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,627	1,522	1,268
Charge-Offs	0	(1)	0
Recoveries	78	65	8
Provision for (recovery of) loan losses	283	41	246
Ending Balance	1,988	1,627	1,522
Ending balance: Individually evaluated for impairment	193	59	102
Ending balance: collectively evaluated for impairment	1,795	1,568	1,420
Loans: Ending balance	265,595	239,915	208,525
Ending balance individually evaluated for impairment	2,919	1,904	2,864
Ending balance collectively evaluated for impairment	262,676	238,011	205,661
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	570	235	211
Charge-Offs	(139)	(187)	0
Recoveries	100	44	11
Provision for (recovery of) loan losses	388	478	13
Ending Balance	919	570	235
Ending balance: Individually evaluated for impairment	650	195	15
Ending balance: collectively evaluated for impairment	269	375	220
Loans: Ending balance	33,086	37,427	30,341
Ending balance individually evaluated for impairment	1,316	858	581
Ending balance collectively evaluated for impairment	31,770	36,569	29,760
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	69	69	109
Charge-Offs	(33)	(59)	(30)
Recoveries	19	40	49
Provision for (recovery of) loan losses	(2)	19	(59)
Ending Balance	53	69	69
Ending balance: Individually evaluated for impairment	0	9	0
Ending balance: collectively evaluated for impairment	53	60	69
Loans: Ending balance	8,470	10,187	12,677
Ending balance individually evaluated for impairment	0	34	7
Ending balance collectively evaluated for impairment	8,470	10,153	12,670
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	29	22	53
Charge-Offs	(40)	(49)	(42)
Recoveries	13	5	5
Provision for (recovery of) loan losses	95	51	6
Ending Balance	97	29	22
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	97	29	22
Loans: Ending balance	8,454	2,050	2,259
Ending balance individually evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	8,454	2,050	2,259
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	30	215	221
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision for (recovery of) loan losses	(2)	(185)	(6)
Ending Balance	28	30	215
Ending balance: Individually evaluated for impairment		0	0
Ending balance: collectively evaluated for impairment	28	30	215
Loans: Ending balance	0	0	0
Ending balance individually evaluated for impairment		$ 0	$ 0
Ending balance collectively evaluated for impairment	$ 0