Loans And The Allowance For Credit Losses (Aging Of Past Due Loans, Including Nonaccrual Loans, By Class) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 700	$ 39
60-89 Days Past Due	489	670
Over 90 Days Past Due	1,141	1,107
Total Past Due	2,330	1,816
Current	1,023,335	1,025,810
Total	1,025,665	1,027,626	943,350
Greater Than 90 Days and Accruing	0	0
Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	5,842	5,806
Total	5,842	5,806
Greater Than 90 Days and Accruing	0	0
All Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	356	399
Total	356	399
Greater Than 90 Days and Accruing	0	0
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	40
Over 90 Days Past Due	9	8
Total Past Due	9	48
Current	173,105	146,942
Total	173,114	146,990	165,665
Greater Than 90 Days and Accruing	0	0
Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	42,578	101,705
Total	42,578	101,705	37,933
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	464,202		418,246
Real Estate Loans – Residential [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	39
60-89 Days Past Due	413	305
Over 90 Days Past Due	603	731
Total Past Due	1,016	1,075
Current	424,524	400,256
Total	425,540	401,331
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Residential [Member] | Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	700	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	204	281
Total Past Due	904	281
Current	37,758	38,206
Total	38,662	38,487
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	329,698		304,347
Real Estate Loans – Commercial [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	76	325
Over 90 Days Past Due	325	87
Total Past Due	401	412
Current	219,602	205,844
Total	220,003	206,256
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Commercial [Member] | Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	109,695	107,659
Total	109,695	107,659
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,875		10,303
Real Estate Loans – Construction [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	1,749	1,798
Total	1,749	1,798
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Construction [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	0	0
Total Past Due	0	0
Current	8,126	17,195
Total	8,126	17,195
Greater Than 90 Days and Accruing	$ 0	$ 0