Loans And The Allowance For Credit Losses (Recorded Investment Of Loans, Including Nonaccrual And Restructured Loans, By Class) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	$ 726,000	$ 441,000
61-90 Days Past Due	17,000	22,000
91 Days or More Past Due	550,000	470,000
Total Past Due	1,293,000	933,000
Current	1,198,877,000	1,181,401,000
Financing receivables, Totals	1,200,170,000	1,182,334,000
91 Days more past due and Accruing	0
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	497,000	49,000
Total Past Due	497,000	49,000
Current	195,285,000	177,548,000
Financing receivables, Totals	195,782,000	177,597,000
Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	91,410,000	94,366,000
Financing receivables, Totals	91,410,000	94,366,000
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, Totals	461,459,000	469,529,000
Real Estate Loans – Residential [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	68,000	157,000
91 Days or More Past Due	471,000	391,000
Total Past Due	539,000	548,000
Current	424,182,000	431,191,000
Financing receivables, Totals	424,721,000	431,739,000
Real Estate Loans – Residential [Member] | Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	16,000	33,000
61-90 Days Past Due	17,000
91 Days or More Past Due	79,000	79,000
Total Past Due	112,000	112,000
Current	36,626,000	37,678,000
Financing receivables, Totals	36,738,000	37,790,000
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, Totals	419,500,000	412,447,000
Real Estate Loans – Commercial [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
61-90 Days Past Due		22,000
Total Past Due		22,000
Current	178,060,000	260,075,000
Financing receivables, Totals	178,060,000	260,097,000
Real Estate Loans – Commercial [Member] | Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	143,000	202,000
Total Past Due	143,000	202,000
Current	241,297,000	152,148,000
Financing receivables, Totals	241,440,000	152,350,000
Real Estate Loans – Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, Totals	28,512,000	23,858,000
Real Estate Loans – Construction [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,739,000	4,131,000
Financing receivables, Totals	2,739,000	4,131,000
Real Estate Loans – Construction [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	25,773,000	19,727,000
Financing receivables, Totals	25,773,000	19,727,000
Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days Past Due	2,000
Total Past Due	2,000
Current	3,452,000	4,504,000
Financing receivables, Totals	3,454,000	4,504,000
All Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	53,000	33,000
Financing receivables, Totals	$ 53,000	$ 33,000