Loans And Allowance For Loan Losses (Schedule Of Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 6,585	$ 3,199
60-89 Days Past Due	929	1,177
90 Days or Greater	6,422	7,182
Total Past Due	13,936	11,558
Current	803,808	804,001
Total loans	817,744	815,559
Non-Accrual	8,545	9,632
Greater than 90 Days Past Due and Accruing	47	235
Commercial Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,639	228
60-89 Days Past Due	219	238
90 Days or Greater	1,144	1,041
Total Past Due	3,002	1,507
Current	312,659	322,986
Total loans	315,661	324,493
Non-Accrual	1,633	1,888
Greater than 90 Days Past Due and Accruing
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	596	22
60-89 Days Past Due	215	61
90 Days or Greater	589	990
Total Past Due	1,400	1,073
Current	76,643	58,300
Total loans	78,043	59,373
Non-Accrual	632	818
Greater than 90 Days Past Due and Accruing		216
Commercial Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	77
90 Days or Greater	2,029	2,359
Total Past Due	2,106	2,359
Current	13,417	19,761
Total loans	15,523	22,120
Non-Accrual	2,029	2,359
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	130	203
60-89 Days Past Due	144	12
90 Days or Greater	490	490
Total Past Due	764	705
Current	25,635	24,217
Total loans	26,399	24,922
Non-Accrual	562	664
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	3,951	2,452
60-89 Days Past Due	296	769
90 Days or Greater	1,824	1,951
Total Past Due	6,071	5,172
Current	289,946	291,931
Total loans	296,017	297,103
Non-Accrual	2,841	3,017
Greater than 90 Days Past Due and Accruing	28
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	63	219
60-89 Days Past Due	19
90 Days or Greater	257	274
Total Past Due	339	493
Current	52,626	52,810
Total loans	52,965	53,303
Non-Accrual	767	814
Greater than 90 Days Past Due and Accruing
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	129	75
60-89 Days Past Due	36	97
90 Days or Greater	89	77
Total Past Due	254	249
Current	17,771	18,752
Total loans	18,025	19,001
Non-Accrual	81	72
Greater than 90 Days Past Due and Accruing	19	19
Tax Exempt [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	15,111	15,244
Total loans	15,111	15,244
Greater than 90 Days Past Due and Accruing