Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	$ 189		$ 569
Ending balance collectively evaluated for impairment	12,469		11,743
Financing receivables, Ending balance individually evaluated for impairment	1,600		3,022
Financing receivables, Ending balance collectively evaluated for impairment	1,102,415		1,079,901
Financing receivables, Totals	1,104,015		1,082,923
Allowance for loan losses	11,890		11,562
Reserve for undisbursed lines of credit	768		750
Total allowance for credit losses	12,658	12,588	12,312	11,817	11,632	11,353
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	0		149
Ending balance collectively evaluated for impairment	3,274		3,298
Financing receivables, Ending balance individually evaluated for impairment	283		233
Financing receivables, Ending balance collectively evaluated for impairment	168,932		164,790
Financing receivables, Totals	169,215		165,023
Allowance for loan losses	2,695		2,915
Reserve for undisbursed lines of credit	579		532
Total allowance for credit losses	3,274	3,411	3,447	3,102	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	400		522
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	45,319		84,689
Financing receivables, Totals	45,319		84,689
Allowance for loan losses	392		494
Reserve for undisbursed lines of credit	8		28
Total allowance for credit losses	400	655	522	410	542	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	3,432		3,221
Financing receivables, Ending balance individually evaluated for impairment	1,031		2,317
Financing receivables, Ending balance collectively evaluated for impairment	519,362		487,634
Financing receivables, Totals	520,393		489,951
Allowance for loan losses	3,474		3,494
Reserve for undisbursed lines of credit	87		88
Total allowance for credit losses	3,561	3,708	3,582	3,476	3,374	3,138
Real Estate Loans – Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	57		59
Ending balance collectively evaluated for impairment	4,785		4,440
Financing receivables, Ending balance individually evaluated for impairment	277		472
Financing receivables, Ending balance collectively evaluated for impairment	330,787		327,150
Financing receivables, Totals	331,064		327,622
Allowance for loan losses	4,799		4,444
Reserve for undisbursed lines of credit	43		55
Total allowance for credit losses	4,842	4,511	4,499	4,557	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	551		234
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	31,813		10,561
Financing receivables, Totals	31,813		10,561
Allowance for loan losses	500		187
Reserve for undisbursed lines of credit	51		47
Total allowance for credit losses	551	275	234	233	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	18		17
Financing receivables, Ending balance individually evaluated for impairment	9		0
Financing receivables, Ending balance collectively evaluated for impairment	5,658		4,701
Financing receivables, Totals	5,667		4,701
Allowance for loan losses	21		17
Reserve for undisbursed lines of credit	0		0
Total allowance for credit losses	21	16	17	21	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	9		11
Financing receivables, Ending balance individually evaluated for impairment	0		0
Financing receivables, Ending balance collectively evaluated for impairment	544		376
Financing receivables, Totals	544		376
Allowance for loan losses	9		11
Reserve for undisbursed lines of credit	0		0
Total allowance for credit losses	$ 9	$ 12	$ 11	$ 18	$ 1	$ 17