Loans (Recorded Investment In Financing Receivable Modified As TDR Within 12 Months) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) contracts	Sep. 30, 2017 USD ($) contracts	Sep. 30, 2018 USD ($) contracts	Sep. 30, 2017 USD ($) contracts	Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Troubled Debt Restructuring, Classification removed	$ 200		$ 2,400	$ 0
Number of Contracts | contracts	52	44	63	58
Recorded Investment	$ 1,112	$ 825	$ 1,290	$ 1,088
Financing Receivable, Modifications, Recorded Investment, During Period	3,704	$ 4,938	6,566	$ 10,765
Troubled Debt Restructuring Included In Nonaccrual Loans	25,200		25,200		$ 38,500
Nonaccrual Trouble Debt Restructuring Current	$ 19,400		19,400		$ 32,400
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			$ 12
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	1	1	1
Recorded Investment	$ 1	$ 20	$ 1	$ 20
Financing Receivable, Modifications, Recorded Investment, During Period	$ 574	$ 1,415	$ 800	$ 4,169
Residential Real Estate Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	0	1
Recorded Investment		$ 17		$ 17
Financing Receivable, Modifications, Recorded Investment, During Period	$ 304	$ 498	$ 304	$ 702
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	8	6	9	6
Recorded Investment	$ 688	$ 427	$ 789	$ 426
Financing Receivable, Modifications, Recorded Investment, During Period	$ 246	$ 417	$ 1,062	$ 1,669
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	2	3	3
Recorded Investment	$ 108	$ 27	$ 108	$ 32
Financing Receivable, Modifications, Recorded Investment, During Period	469	168	860	529
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period				8
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 336	$ 151	$ 453	$ 216
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 621	$ 834	$ 1,216	$ 1,152
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	0	2
Recorded Investment		$ 72		$ 248
Financing Receivable, Modifications, Recorded Investment, During Period	$ 1,154	$ 1,455	$ 1,859	$ 2,320
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	40	33	50	45
Recorded Investment	$ 315	$ 262	$ 392	$ 345
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	897	2,061	2,043	3,608
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0	12	0
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	22	400	208	400
Accruing Financing Receivable Modifications [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	55	144	55	144
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	211	90	746
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	453	123	735	478
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0	0	0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	336	110	437	175
Accruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	31	99	59	140
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		974	447	1,525
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	2,807	2,877	4,523	7,157
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	552	1,015	592	3,769
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	249	354	249	558
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	246	206	972	923
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	16	45	125	51
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period				8
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		41	16	41
Nonaccruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	590	735	1,157	1,012
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 1,154	$ 481	$ 1,412	$ 795