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Allowance for Loan Losses (Impaired Loans By Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 8,381	$ 9,453
Recorded Investment	7,420	8,590
Related Allowance	300	962
Average Recorded Investment	7,685	8,898	$ 11,600
Interest Income Recognized	301	383	$ 322
Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9	0
Recorded Investment	8	0
Related Allowance	0	0
Average Recorded Investment	9	0
Interest Income Recognized	0	0
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	364	1,535
Recorded Investment	228	1,316
Related Allowance	0	650
Average Recorded Investment	269	1,485
Interest Income Recognized	21	85
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,145	2,976
Recorded Investment	3,062	2,926
Related Allowance	149	193
Average Recorded Investment	3,098	2,965
Interest Income Recognized	107	105
Construction And Farmland [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	488	332
Recorded Investment	433	281
Related Allowance	100	0
Average Recorded Investment	450	297
Interest Income Recognized	33	27
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,375	4,610
Recorded Investment	3,689	4,067
Related Allowance	51	119
Average Recorded Investment	3,859	4,151
Interest Income Recognized	140	166
All Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized		0
With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,946	4,822
Recorded Investment	4,034	4,015
Average Recorded Investment	4,260	4,177
Interest Income Recognized	152	171
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	364	564
Recorded Investment	228	356
Average Recorded Investment	269	422
Interest Income Recognized	21	25
With No Related Allowance [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	369	0
Recorded Investment	356	0
Average Recorded Investment	358	0
Interest Income Recognized	4	0
With No Related Allowance [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	407	558
Recorded Investment	329	501
Average Recorded Investment	335	511
Interest Income Recognized	0	4
With No Related Allowance [Member] | Construction And Farmland Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment		0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With No Related Allowance [Member] | Construction And Farmland Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	301	332
Recorded Investment	246	281
Average Recorded Investment	263	297
Interest Income Recognized	25	27
With No Related Allowance [Member] | Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9	0
Recorded Investment	8	0
Average Recorded Investment	9	0
Interest Income Recognized	0	0
With No Related Allowance [Member] | Residential Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	276	468
Recorded Investment	65	92
Average Recorded Investment	68	93
Interest Income Recognized	1	0
With No Related Allowance [Member] | Residential Single Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,854	2,616
Recorded Investment	2,435	2,499
Average Recorded Investment	2,583	2,565
Interest Income Recognized	80	101
With No Related Allowance [Member] | Residential Multifamily [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	366	284
Recorded Investment	367	286
Average Recorded Investment	375	289
Interest Income Recognized	21	14
With No Related Allowance [Member] | All Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		0
Recorded Investment		0
Average Recorded Investment		0
Interest Income Recognized		0
With An Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,435	4,631
Recorded Investment	3,386	4,575
Related Allowance	300	962
Average Recorded Investment	3,425	4,721
Interest Income Recognized	149	212
With An Allowance Recorded [Member] | Commercial - Non Real Estate Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	971
Recorded Investment	0	960
Related Allowance	0	650
Average Recorded Investment	0	1,063
Interest Income Recognized	0	60
With An Allowance Recorded [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,369	2,418
Recorded Investment	2,377	2,425
Related Allowance	149	193
Average Recorded Investment	2,405	2,454
Interest Income Recognized	103	101
With An Allowance Recorded [Member] | Construction And Farmland Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | Construction And Farmland Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	187	0
Recorded Investment	187	0
Related Allowance	100	0
Average Recorded Investment	187	0
Interest Income Recognized	8	0
With An Allowance Recorded [Member] | Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | Residential Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | Residential Single Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	879	1,242
Recorded Investment	822	1,190
Related Allowance	51	119
Average Recorded Investment	833	1,204
Interest Income Recognized	38	51
With An Allowance Recorded [Member] | Residential Multifamily [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | All Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	$ 0	$ 0

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