Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	$ 438		$ 569
Ending balance collectively evaluated for impairment	12,553		11,743
Financing receivables, Ending balance individually evaluated for impairment	2,684		3,022
Financing receivables, Ending balance collectively evaluated for impairment	1,162,817		1,079,901
Financing receivables, Totals	1,165,501		1,082,923
Allowance for loan losses	12,199		11,562
Reserve for undisbursed lines of credit	792		750
Total allowance for credit losses	12,991	12,658	12,312	12,080	11,817	11,353
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	253		149
Ending balance collectively evaluated for impairment	3,171		3,298
Financing receivables, Ending balance individually evaluated for impairment	1,275		233
Financing receivables, Ending balance collectively evaluated for impairment	161,863		164,790
Financing receivables, Totals	163,138		165,023
Allowance for loan losses	2,810		2,915
Reserve for undisbursed lines of credit	614		532
Total allowance for credit losses	3,424	3,274	3,447	3,241	3,102	2,905
Municipal Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	0		0
Ending balance collectively evaluated for impairment	746		522
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	96,491		84,689
Financing receivables, Totals	96,491		84,689
Allowance for loan losses	731		494
Reserve for undisbursed lines of credit	15		28
Total allowance for credit losses	746	400	522	441	410	309
Real Estate Loans – Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	129		361
Ending balance collectively evaluated for impairment	3,015		3,060
Financing receivables, Ending balance individually evaluated for impairment	1,135		2,317
Financing receivables, Ending balance collectively evaluated for impairment	492,532		458,078
Financing receivables, Totals	493,667		460,395
Allowance for loan losses	3,057		3,333
Reserve for undisbursed lines of credit	87		88
Total allowance for credit losses	3,144	3,385	3,421	3,433	3,357	3,017
Real Estate Loans – Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	56		59
Ending balance collectively evaluated for impairment	5,062		4,601
Financing receivables, Ending balance individually evaluated for impairment	274		472
Financing receivables, Ending balance collectively evaluated for impairment	372,811		356,706
Financing receivables, Totals	373,085		357,178
Allowance for loan losses	5,075		4,605
Reserve for undisbursed lines of credit	43		55
Total allowance for credit losses	5,118	5,018	4,660	4,690	4,676	4,605
Real Estate Loans – Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	0		0
Ending balance collectively evaluated for impairment	533		234
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	32,768		10,561
Financing receivables, Totals	32,768		10,561
Allowance for loan losses	500		187
Reserve for undisbursed lines of credit	33		47
Total allowance for credit losses	533	551	234	231	233	477
Installment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	0		0
Ending balance collectively evaluated for impairment	18		17
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	5,898		4,701
Financing receivables, Totals	5,898		4,701
Allowance for loan losses	18		17
Reserve for undisbursed lines of credit	0		0
Total allowance for credit losses	18	21	17	19	21	23
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	0		0
Ending balance collectively evaluated for impairment	8		11
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	454		376
Financing receivables, Totals	454		376
Allowance for loan losses	8		11
Reserve for undisbursed lines of credit	0		0
Total allowance for credit losses	$ 8	$ 9	$ 11	$ 25	$ 18	$ 17