Loans And Allowance For Loan Losses (Schedule Of Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	$ 4,505	$ 3,350
Impaired loans, with no related allowance, Unpaid Principal Balance	4,710	3,574
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment	2,204	2,389
Impaired loans, with related allowance, Unpaid Principal Balance	4,279	4,464
Impaired loans, with related allowance, Related Allowance	424	373
Impaired loans, Recorded Investment, Total	6,709	5,739
Impaired loans, Unpaid Principal Balance, Total	8,989	8,038
Impaired loans, with no related allowance, Average Recorded Investment	4,696	4,497	$ 4,272
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	246	121	98
Impaired loans, with related allowance, Average Recorded Investment	2,078	2,661	960
Impaired loans, with related allowance, Cash Basis Interest Income Recognized			1
Impaired loans, Average Recorded Investment, Total	6,774	7,158	5,232
Impaired loans, Cash Basis Interest Income Recognized, Total	246	121	99
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	2,831	1,692
Impaired loans, with no related allowance, Unpaid Principal Balance	2,919	1,736
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment	1,650	531
Impaired loans, with related allowance, Unpaid Principal Balance	3,575	531
Impaired loans, with related allowance, Related Allowance	193	43
Impaired loans, with no related allowance, Average Recorded Investment	2,768	2,663	1,589
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	157	60	66
Impaired loans, with related allowance, Average Recorded Investment	1,619	532	572
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	130	202
Impaired loans, with no related allowance, Unpaid Principal Balance	130	352
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment	217	224
Impaired loans, with related allowance, Unpaid Principal Balance	367	374
Impaired loans, with related allowance, Related Allowance	173	175
Impaired loans, with no related allowance, Average Recorded Investment	239	346	537
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	4	10	4
Impaired loans, with related allowance, Average Recorded Investment	118	227	376
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Commercial Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment
Impaired loans, with no related allowance, Unpaid Principal Balance
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment		1,111
Impaired loans, with related allowance, Unpaid Principal Balance		3,036
Impaired loans, with related allowance, Related Allowance		58
Impaired loans, with no related allowance, Average Recorded Investment			1,514
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized
Impaired loans, with related allowance, Average Recorded Investment		1,243
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	139	106
Impaired loans, with no related allowance, Unpaid Principal Balance	139	106
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment
Impaired loans, with related allowance, Unpaid Principal Balance
Impaired loans, with related allowance, Related Allowance
Impaired loans, with no related allowance, Average Recorded Investment	156	143	162
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	9	8	3
Impaired loans, with related allowance, Average Recorded Investment
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	1,387	1,332
Impaired loans, with no related allowance, Unpaid Principal Balance	1,504	1,362
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment	322	515
Impaired loans, with related allowance, Unpaid Principal Balance	322	515
Impaired loans, with related allowance, Related Allowance	49	97
Impaired loans, with no related allowance, Average Recorded Investment	1,514	1,327	470
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	73	42	25
Impaired loans, with related allowance, Average Recorded Investment	325	650
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	16	18
Impaired loans, with no related allowance, Unpaid Principal Balance	16	18
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment
Impaired loans, with related allowance, Unpaid Principal Balance
Impaired loans, with related allowance, Related Allowance
Impaired loans, with no related allowance, Average Recorded Investment	17	18
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	1
Impaired loans, with related allowance, Average Recorded Investment
Impaired loans, with related allowance, Cash Basis Interest Income Recognized
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	2
Impaired loans, with no related allowance, Unpaid Principal Balance	2
Impaired loans, with no related allowance, Related Allowance
Impaired loans, with related allowance, Recorded Investment	15	8
Impaired loans, with related allowance, Unpaid Principal Balance	15	8
Impaired loans, with related allowance, Related Allowance	9
Impaired loans, with no related allowance, Average Recorded Investment	2
Impaired loans, with no related allowance, Cash Basis Interest Income Recognized	2	1
Impaired loans, with related allowance, Average Recorded Investment	16	9	12
Impaired loans, with related allowance, Cash Basis Interest Income Recognized			$ 1

Impaired Financing Receivable Related Allowance With No Related Allowance

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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 14A
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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