Loans And The Allowance For Credit Losses (Loan Loss Experience And Activity In The Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 12,312	$ 11,353
Charge-offs	(28)	0
Recoveries	54	29
Provision (credit)	250	250
Ending balance	12,588	11,632
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,447	2,905
Charge-offs	0	0
Recoveries	9	20
Provision (credit)	(45)	(192)
Ending balance	3,411	2,733
Municipal Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	522	309
Charge-offs	0	0
Recoveries	0	0
Provision (credit)	133	233
Ending balance	655	542
Real Estate Loans – Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,582	3,138
Charge-offs	(7)	0
Recoveries	3	1
Provision (credit)	130	235
Ending balance	3,708	3,374
Real Estate Loans – Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,499	4,484
Charge-offs	(1)	0
Recoveries	40	1
Provision (credit)	(27)	199
Ending balance	4,511	4,684
Real Estate Loans – Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	234	477
Charge-offs	0	0
Recoveries	1	7
Provision (credit)	40	(204)
Ending balance	275	280
Installment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	17	23
Charge-offs	0	0
Recoveries	0	0
Provision (credit)	(1)	(5)
Ending balance	16	18
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11	17
Charge-offs	(20)	0
Recoveries	1	0
Provision (credit)	20	(16)
Ending balance	$ 12	$ 1