Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	$ 678	$ 569
Ending balance collectively evaluated for impairment	11,910	11,743
Financing receivables, Ending balance individually evaluated for impairment	3,415	3,022
Financing receivables, Ending balance collectively evaluated for impairment	1,098,298	1,079,901
Financing receivables, Totals	1,101,713	1,082,923
Allowance for loan losses	11,796	11,562
Reserve for undisbursed lines of credit	792	750
Total allowance for credit losses	12,588	12,312	11,632	11,353
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	126	149
Ending balance collectively evaluated for impairment	3,285	3,298
Financing receivables, Ending balance individually evaluated for impairment	724	233
Financing receivables, Ending balance collectively evaluated for impairment	167,776	164,790
Financing receivables, Totals	168,500	165,023
Allowance for loan losses	2,829	2,915
Reserve for undisbursed lines of credit	582	532
Total allowance for credit losses	3,411	3,447	2,733	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	655	522
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	85,211	84,689
Financing receivables, Totals	85,211	84,689
Allowance for loan losses	648	494
Reserve for undisbursed lines of credit	7	28
Total allowance for credit losses	655	522	542	309
Real Estate Loans – Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	491	361
Ending balance collectively evaluated for impairment	3,217	3,221
Financing receivables, Ending balance individually evaluated for impairment	2,401	2,317
Financing receivables, Ending balance collectively evaluated for impairment	501,825	487,634
Financing receivables, Totals	504,226	489,951
Allowance for loan losses	3,621	3,494
Reserve for undisbursed lines of credit	87	88
Total allowance for credit losses	3,708	3,582	3,374	3,138
Real Estate Loans – Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	58	59
Ending balance collectively evaluated for impairment	4,453	4,440
Financing receivables, Ending balance individually evaluated for impairment	281	472
Financing receivables, Ending balance collectively evaluated for impairment	323,927	327,150
Financing receivables, Totals	324,208	327,622
Allowance for loan losses	4,452	4,444
Reserve for undisbursed lines of credit	59	55
Total allowance for credit losses	4,511	4,499	4,684	4,484
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	275	234
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	14,115	10,561
Financing receivables, Totals	14,115	10,561
Allowance for loan losses	218	187
Reserve for undisbursed lines of credit	57	47
Total allowance for credit losses	275	234	280	477
Installment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	3	0
Ending balance collectively evaluated for impairment	13	17
Financing receivables, Ending balance individually evaluated for impairment	9	0
Financing receivables, Ending balance collectively evaluated for impairment	5,183	4,701
Financing receivables, Totals	5,192	4,701
Allowance for loan losses	16	17
Reserve for undisbursed lines of credit	0	0
Total allowance for credit losses	16	17	18	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	12	11
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	261	376
Financing receivables, Totals	261	376
Allowance for loan losses	12	11
Reserve for undisbursed lines of credit	0	0
Total allowance for credit losses	$ 12	$ 11	$ 1	$ 17