Loans And The Allowance For Credit Losses (Aging Of Past Due Loans, Including Nonaccrual Loans, By Class) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 9	$ 39
60-89 Days Past Due	214	670
Over 90 Days Past Due	2,030	1,107
Total Past Due	2,253	1,816
Current	1,070,626	1,025,810
Total	1,072,879	1,027,626	1,008,076
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	7	0
Total Past Due	7	0
Current	5,252	5,806
Total	5,259	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	334	399
Total	334	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	150	40
Over 90 Days Past Due	9	8
Total Past Due	159	48
Current	169,291	146,942
Total	169,450	146,990	156,043
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	82,048	101,705
Total	82,048	101,705	97,015
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	477,321		425,620
Real Estate Loans – Residential [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1	39
60-89 Days Past Due	64	305
Over 90 Days Past Due	887	731
Total Past Due	952	1,075
Current	437,690	400,256
Total	438,642	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	8	0
60-89 Days Past Due	0	0
Over 90 Days Past Due	726	281
Total Past Due	734	281
Current	37,945	38,206
Total	38,679	38,487
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	327,182		310,863
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	0	325
Over 90 Days Past Due	401	87
Total Past Due	401	412
Current	217,162	205,844
Total	217,563	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	109,619	107,659
Total	109,619	107,659
Greater Than 90 Days and Accruing	0	0
Real Estate Loans – Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,285		12,238
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	1,960	1,798
Total	1,960	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	9,325	17,195
Total	9,325	17,195
Greater Than 90 Days and Accruing	$ 0	$ 0