Loans And Allowance For Loan Losses (Schedule Of Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,686	$ 2,628
60-89 Days Past Due	992	1,293
90 Days or Greater	7,599	10,095
Total Past Due	11,277	14,016
Current	797,728	714,425
Total loans	809,005	728,441
Greater than 90 Days Past Due and Accruing	954
Commercial Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	667	264
60-89 Days Past Due		284
90 Days or Greater	1,515	2,504
Total Past Due	2,182	3,052
Current	296,602	282,432
Total loans	298,784	285,484
Greater than 90 Days Past Due and Accruing	196
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	512	294
60-89 Days Past Due	27	201
90 Days or Greater	692	996
Total Past Due	1,231	1,491
Current	77,392	60,959
Total loans	78,623	62,450
Greater than 90 Days Past Due and Accruing	154
Commercial Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		91
60-89 Days Past Due		142
90 Days or Greater	2,599	2,993
Total Past Due	2,599	3,226
Current	22,507	26,834
Total loans	25,106	30,060
Greater than 90 Days Past Due and Accruing
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	67	162
60-89 Days Past Due	109
90 Days or Greater	401	526
Total Past Due	577	688
Current	25,629	25,892
Total loans	26,206	26,580
Greater than 90 Days Past Due and Accruing
Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	949	1,690
60-89 Days Past Due	754	644
90 Days or Greater	2,092	2,553
Total Past Due	3,795	4,887
Current	288,327	234,912
Total loans	292,122	239,799
Greater than 90 Days Past Due and Accruing	572
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	440	40
60-89 Days Past Due	8
90 Days or Greater	257	266
Total Past Due	705	306
Current	52,339	51,156
Total loans	53,044	51,462
Greater than 90 Days Past Due and Accruing	29
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	51	87
60-89 Days Past Due	94	22
90 Days or Greater	43	257
Total Past Due	188	366
Current	19,490	22,540
Total loans	19,678	22,906
Greater than 90 Days Past Due and Accruing	3
Tax Exempt [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	15,442	9,700
Total loans	15,442	9,700
Greater than 90 Days Past Due and Accruing