Loans And Allowance For Loan Losses (Schedule Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	$ 7,575		$ 7,575		$ 9,015
Impaired loans, with no related allowance, Recorded Investment, Subtotal	7,101		7,101		7,943
Impaired loans, with no related allowance, Unpaid Principal Balance	9,782		9,782		11,116
Impaired loans, with no related allowance, Unpaid Principal Balance, Subtotal	9,308		9,308		10,044
Impaired loans, with related allowance, Recorded Investment, Subtotal	474		474		1,072
Impaired loans, with related allowance, Unpaid Principal Balance, Subtotal	474		474		1,072
Impaired loans, Related Allowance, Subtotal	130		130		335
Impaired loans, Related Allowance	130		130		335
Impaired loans, with no related allowance, Average Recorded Investment, Subtotal	7,579	3,222	7,847
Impaired loans, with no related allowance, Interest Recorded, Subtotal	54		105
Impaired loans, with related allowance, Average Recorded Investment, Subtotal	693	6,253	804	7,263
Impaired loans, with related allowance, Interest Recorded, Subtotal
Impaired loans, Average Recorded Investment, Total	8,272	9,475	8,651	9,574
Impaired loans, Interest Recorded, Total	54		105
Commercial Real Estate Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	3,709		3,709		3,301
Impaired loans, with no related allowance, Unpaid Principal Balance	3,829		3,829		3,431
Impaired loans, with related allowance, Recorded Investment					176
Impaired loans, with related allowance, Unpaid Principal Balance					176
Impaired loans, Related Allowance					100
Impaired loans, with no related allowance, Average Recorded Investment	3,814	1,740	3,589	1,199
Impaired loans, with no related allowance, Interest Recorded	47		96
Impaired loans, with related allowance, Average Recorded Investment		1,304		2,075
Impaired loans, with related allowance, Interest Recorded
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	514		514		973
Impaired loans, with no related allowance, Unpaid Principal Balance	579		579		1,043
Impaired loans, with related allowance, Recorded Investment	100		100		135
Impaired loans, with related allowance, Unpaid Principal Balance	100		100		135
Impaired loans, Related Allowance	100		100		135
Impaired loans, with no related allowance, Average Recorded Investment	603	972	702	638
Impaired loans, with no related allowance, Interest Recorded	6		6
Impaired loans, with related allowance, Average Recorded Investment	100	341	100	453
Impaired loans, with related allowance, Interest Recorded
Commercial Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	2,225		2,225		2,992
Impaired loans, with no related allowance, Unpaid Principal Balance	4,150		4,150		4,893
Impaired loans, with related allowance, Recorded Investment	374		374		761
Impaired loans, with related allowance, Unpaid Principal Balance	374		374		761
Impaired loans, Related Allowance	30		30		100
Impaired loans, with no related allowance, Average Recorded Investment	2,424	334	2,813	264
Impaired loans, with no related allowance, Interest Recorded
Impaired loans, with related allowance, Average Recorded Investment	593	4,608	704	4,735
Impaired loans, with related allowance, Interest Recorded
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	596		596		595
Impaired loans, with no related allowance, Unpaid Principal Balance	671		671		595
Impaired loans, with related allowance, Recorded Investment
Impaired loans, with related allowance, Unpaid Principal Balance
Impaired loans, Related Allowance
Impaired loans, with no related allowance, Average Recorded Investment	603	176	605	210
Impaired loans, with no related allowance, Interest Recorded
Impaired loans, with related allowance, Average Recorded Investment
Impaired loans, with related allowance, Interest Recorded
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	57		57		82
Impaired loans, with no related allowance, Unpaid Principal Balance	79		79		82
Impaired loans, with related allowance, Recorded Investment
Impaired loans, with related allowance, Unpaid Principal Balance
Impaired loans, Related Allowance
Impaired loans, with no related allowance, Average Recorded Investment	135		138
Impaired loans, with no related allowance, Interest Recorded	1		3
Impaired loans, with related allowance, Interest Recorded