Loans (Recorded Investment In Financing Receivable Modified As TDR Within 12 Months) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) contracts	Mar. 31, 2020 USD ($) contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	36	49
Recorded Investment | $	$ 1,034	$ 5,060
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | $	$ 1,000	$ 5,100
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts		2
Recorded Investment | $		$ 4,068
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	10	4
Recorded Investment | $	$ 763	$ 443
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	4
Recorded Investment | $		$ 71
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0
PPP loans receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0
Bank Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0
GFSC loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	5
Recorded Investment | $	$ 25
Check loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0
Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0
Consumer less GFSC and Check Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	19
Recorded Investment | $	$ 210
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	2
Recorded Investment | $	$ 0	$ 92
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	2	1
Recorded Investment | $	$ 36	$ 17
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts		36
Recorded Investment | $		$ 369
Finance Leases Financing Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0
Recorded Investment | $	$ 0	$ 0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period | $	300	4,500
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period | $	$ 700	$ 500