Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	$ 10,570
Nonaccrual Loans with an Allowance	28,996
Nonaccrual loans	39,566	$ 35,076
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	0
Nonaccrual Loans with an Allowance	10,330
Nonaccrual loans	10,330	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	227
Nonaccrual Loans with an Allowance	313
Nonaccrual loans	540	643
Real estate, commercial | Real estate – mortgage – commercial and other
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	7,521
Nonaccrual Loans with an Allowance	13,133
Nonaccrual loans	20,654	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	2,444
Nonaccrual Loans with an Allowance	3,763
Nonaccrual loans	6,207	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	1,298
Nonaccrual loans	1,676	1,333
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual Loans with No Allowance	0
Nonaccrual Loans with an Allowance	159
Nonaccrual loans	$ 159	$ 180