Loans And Allowance For Loan Losses (Schedule Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	$ 5,949		$ 6,603
Impaired loans, with no related allowance, Recorded Investment, Subtotal	3,681		4,244
Impaired loans, with no related allowance, Unpaid Principal Balance	8,401		9,192
Impaired loans, with no related allowance, Unpaid Principal Balance, Subtotal	4,208		4,863
Impaired loans, with related allowance, Recorded Investment, Subtotal	2,268		2,359
Impaired loans, with related allowance, Unpaid Principal Balance, Subtotal	4,193		4,329
Impaired loans, Related Allowance, Subtotal	120		120
Impaired loans, Related Allowance	120		120
Impaired loans, with no related allowance, Average Recorded Investment, Subtotal	4,237	7,859
Impaired loans, with no related allowance, Interest Recorded, Subtotal	21	55
Impaired loans, with related allowance, Average Recorded Investment, Subtotal	2,268	1,228
Impaired loans, with related allowance, Interest Recorded, Subtotal
Impaired loans, Average Recorded Investment, Total	6,505	9,087
Impaired loans, Interest Recorded, Total	21	55
Commercial Real Estate Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	2,163		2,662
Impaired loans, with no related allowance, Unpaid Principal Balance	2,525		3,072
Impaired loans, with related allowance, Recorded Investment	239
Impaired loans, with related allowance, Unpaid Principal Balance	239
Impaired loans, Related Allowance	75
Impaired loans, with no related allowance, Average Recorded Investment	2,245	3,190
Impaired loans, with no related allowance, Interest Recorded	17	55
Impaired loans, with related allowance, Average Recorded Investment	239	367
Impaired loans, with related allowance, Interest Recorded
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	654		841
Impaired loans, with no related allowance, Unpaid Principal Balance	714		966
Impaired loans, with no related allowance, Average Recorded Investment	917	913
Impaired loans, with no related allowance, Interest Recorded	1
Impaired loans, with related allowance, Average Recorded Investment		100
Impaired loans, with related allowance, Interest Recorded
Commercial Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with related allowance, Recorded Investment	2,029		2,359
Impaired loans, with related allowance, Unpaid Principal Balance	3,954		4,329
Impaired loans, Related Allowance	45		120
Impaired loans, with no related allowance, Average Recorded Investment	205	3,024
Impaired loans, with no related allowance, Interest Recorded
Impaired loans, with related allowance, Average Recorded Investment	2,029	761
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	562		664
Impaired loans, with no related allowance, Unpaid Principal Balance	637		748
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	582	592
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	266		77
Impaired loans, with no related allowance, Unpaid Principal Balance	296		77
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	268	140
Impaired loans, with no related allowance, Interest Recorded	2
Impaired loans, with related allowance, Interest Recorded
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	22
Impaired loans, with no related allowance, Unpaid Principal Balance	22
Impaired loans, with no related allowance, Average Recorded Investment	18
Impaired loans, with no related allowance, Interest Recorded	1
Impaired loans, with related allowance, Interest Recorded
Other Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, with no related allowance, Recorded Investment	14
Impaired loans, with no related allowance, Unpaid Principal Balance	14
Impaired loans, with no related allowance, Average Recorded Investment	2
Impaired loans, with no related allowance, Interest Recorded
Impaired loans, with related allowance, Interest Recorded