Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	$ 13,825
Nonaccrual Loans with an Allowance	19,168
Nonaccrual loans	32,993	$ 35,076
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	0
Nonaccrual Loans with an Allowance	9,476
Nonaccrual loans	9,476	9,681
Real estate, commercial | Real estate – construction, land development & other land loans
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	221
Nonaccrual Loans with an Allowance	172
Nonaccrual loans	393	643
Real estate, commercial | Real estate – mortgage – commercial and other
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	11,467
Nonaccrual Loans with an Allowance	4,419
Nonaccrual loans	15,886	17,191
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	1,759
Nonaccrual Loans with an Allowance	4,006
Nonaccrual loans	5,765	6,048
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	378
Nonaccrual Loans with an Allowance	967
Nonaccrual loans	1,345	1,333
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	0
Nonaccrual Loans with an Allowance	128
Nonaccrual loans	$ 128	$ 180