Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	$ 139		$ 63
Ending balance collectively evaluated for impairment	12,859		12,752
Financing receivables, Ending balance individually evaluated for impairment	1,404		791
Financing receivables, Ending balance collectively evaluated for impairment	1,256,528		1,181,543
Financing receivables, Totals	1,257,932		1,182,334
Allowance for loan losses	12,210		11,833
Reserve for undisbursed lines of credit	788		982
Total allowance for credit losses	12,998	$ 12,891	12,815	$ 12,858	$ 12,906	$ 12,828
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment	3,391		3,331
Financing receivables, Ending balance individually evaluated for impairment	566		134
Financing receivables, Ending balance collectively evaluated for impairment	206,501		177,463
Financing receivables, Totals	207,067		177,597
Allowance for loan losses	2,833		2,583
Reserve for undisbursed lines of credit	558		748
Total allowance for credit losses	3,391	3,450	3,331	3,403	3,656	3,354
Municipal Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment	660		636
Financing receivables, Ending balance collectively evaluated for impairment	108,423		94,366
Financing receivables, Totals	108,423		94,366
Allowance for loan losses	631		623
Reserve for undisbursed lines of credit	29		13
Total allowance for credit losses	660	369	636	702	386	768
Real Estate Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance individually evaluated for impairment	139		63
Ending balance collectively evaluated for impairment	2,900		3,064
Financing receivables, Ending balance individually evaluated for impairment	838		657
Financing receivables, Ending balance collectively evaluated for impairment	447,794		468,872
Financing receivables, Totals	448,632		469,529
Allowance for loan losses	2,959		3,038
Reserve for undisbursed lines of credit	80		89
Total allowance for credit losses	3,039	3,126	3,127	3,281	3,246	3,081
Real Estate Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment	5,308		5,251
Financing receivables, Ending balance collectively evaluated for impairment	450,673		412,447
Financing receivables, Totals	450,673		412,447
Allowance for loan losses	5,238		5,209
Reserve for undisbursed lines of credit	70		42
Total allowance for credit losses	5,308	5,354	5,251	5,044	5,089	5,085
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment	544		415
Financing receivables, Ending balance collectively evaluated for impairment	40,748		23,858
Financing receivables, Totals	40,748		23,858
Allowance for loan losses	493		325
Reserve for undisbursed lines of credit	51		90
Total allowance for credit losses	544	533	415	400	494	512
Installment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment	56		13
Financing receivables, Ending balance collectively evaluated for impairment	2,370		4,504
Financing receivables, Totals	2,370		4,504
Allowance for loan losses	56		13
Total allowance for credit losses	56	$ 59	13	16	18	18
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance collectively evaluated for impairment			42
Financing receivables, Ending balance collectively evaluated for impairment	19		33
Financing receivables, Totals	$ 19		33
Allowance for loan losses			42
Total allowance for credit losses			$ 42	$ 12	$ 17	$ 10