Loans (Recorded Investment In Financing Receivable Modified As TDR Within 12 Months) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) contracts	Jun. 30, 2020 USD ($) contracts	Jun. 30, 2021 USD ($) contracts	Jun. 30, 2020 USD ($) contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	21	30	27	34
Recorded Investment | $	$ 660,000	$ 4,613,000	$ 1,102,000	$ 4,660,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | $	$ 700,000	$ 4,600,000	$ 1,100,000	$ 4,700,000
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts		1		2
Recorded Investment | $		$ 4,043,000		$ 4,051,000
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	1	0	1
Recorded Investment | $		$ 16,000		$ 16,000
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	5	3	6	3
Recorded Investment | $	$ 334,000	$ 294,000	$ 373,000	$ 294,000
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	2	0	2
Recorded Investment | $		$ 37,000		$ 37,000
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0	0	0
PPP loans receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0		0
Bank Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0		0
GFSC loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0		0
Check loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0		0
Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0		0
Consumer less GFSC and Check Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	14		17
Recorded Investment | $	$ 100,000		$ 113,000
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	1	0	1	0
Recorded Investment | $	$ 220,000		$ 220,000
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	1	0	1
Recorded Investment | $	$ 0	$ 14,000	$ 0	$ 14,000
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	1	2	2	2
Recorded Investment | $	$ 6,000	$ 30,000	$ 34,000	$ 30,000
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts		20		23
Recorded Investment | $		$ 179,000		$ 218,000
Finance Leases Financing Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Contracts	0	0	1	0
Recorded Investment | $	$ 0	$ 0	$ 362,000	$ 0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period | $	44,000	4,200,000	84,000	4,200,000
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period | $	$ 600,000	$ 400,000	$ 1,000,000.0	$ 500,000