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Allowance for Loan Losses (Impaired Loans By Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 12,495	$ 14,341
Recorded Investment	11,445	13,400
Related Allowance	458	385
Average Recorded Investment	11,642	13,719	$ 14,400
Interest Income Recognized	322	415	$ 404
Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	34	8
Recorded Investment	34	8
Related Allowance	9	0
Average Recorded Investment	36	9
Interest Income Recognized	1	0
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,221	594
Recorded Investment	860	582
Related Allowance	195	15
Average Recorded Investment	909	654
Interest Income Recognized	40	35
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,941	3,194
Recorded Investment	1,907	2,867
Related Allowance	59	102
Average Recorded Investment	1,938	2,954
Interest Income Recognized	72	75
Construction And Farmland [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	362	1,320
Recorded Investment	316	1,324
Related Allowance	0	0
Average Recorded Investment	330	1,358
Interest Income Recognized	28	75
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8,937	9,225
Recorded Investment	8,328	8,619
Related Allowance	195	268
Average Recorded Investment	8,429	8,744
Interest Income Recognized	181	230
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	9,519	10,895
Recorded Investment	8,728	10,335
Average Recorded Investment	8,889	10,586
Interest Income Recognized	211	294
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	626	311
Recorded Investment	304	299
Average Recorded Investment	342	356
Interest Income Recognized	23	21
With No Related Allowance [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	330	869
Recorded Investment	331	772
Average Recorded Investment	336	778
Interest Income Recognized	15	15
With No Related Allowance [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	805	1,298
Recorded Investment	767	1,066
Average Recorded Investment	785	1,137
Interest Income Recognized	20	13
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	362	1,320
Recorded Investment	316	1,324
Average Recorded Investment	330	1,358
Interest Income Recognized	28	75
With No Related Allowance [Member] | Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	25	8
Recorded Investment	25	8
Average Recorded Investment	27	9
Interest Income Recognized	1	0
With No Related Allowance [Member] | Residential Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	17
Recorded Investment	0	17
Average Recorded Investment	0	18
Interest Income Recognized	0	0
With No Related Allowance [Member] | Residential Single Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,371	7,072
Recorded Investment	6,985	6,849
Average Recorded Investment	7,069	6,930
Interest Income Recognized	124	170
With No Related Allowance [Member] | Residential Multifamily [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
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	2,976	3,446
Recorded Investment	2,717	3,065
Related Allowance	458	385
Average Recorded Investment	2,753	3,133
Interest Income Recognized	111	121
With An Allowance Recorded [Member] | Commercial - Non Real Estate Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	595	283
Recorded Investment	556	283
Related Allowance	195	15
Average Recorded Investment	567	298
Interest Income Recognized	17	14
With An Allowance Recorded [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	203
Recorded Investment	0	203
Related Allowance	0	37
Average Recorded Investment	0	205
Interest Income Recognized	0	10
With An Allowance Recorded [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	806	824
Recorded Investment	809	826
Related Allowance	59	65
Average Recorded Investment	817	834
Interest Income Recognized	37	37
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	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] | Consumer Installment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9
Recorded Investment	9
Related Allowance	9
Average Recorded Investment	9
Interest Income Recognized	0
With An Allowance Recorded [Member] | Residential Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	217	458
Recorded Investment	44	115
Related Allowance	44	56
Average Recorded Investment	45	120
Interest Income Recognized	0	0
With An Allowance Recorded [Member] | Residential Single Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,349	1,678
Recorded Investment	1,299	1,638
Related Allowance	151	212
Average Recorded Investment	1,315	1,676
Interest Income Recognized	57	60
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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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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