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Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual Loans with No Allowance | $ 12,196 |
Nonaccrual Loans with an Allowance | 19,072 |
Nonaccrual loans | 31,268 | $ 35,076
Commercial, financial, and agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual Loans with No Allowance | 510 |
Nonaccrual Loans with an Allowance | 9,019 |
Nonaccrual loans | 9,529 | 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 | 0 |
Nonaccrual Loans with an Allowance | 373 |
Nonaccrual loans | 373 | 643
Real estate, commercial | Real estate – mortgage – commercial and other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual Loans with No Allowance | 10,951 |
Nonaccrual Loans with an Allowance | 4,972 |
Nonaccrual loans | 15,923 | 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 | 735 |
Nonaccrual Loans with an Allowance | 3,599 |
Nonaccrual loans | 4,334 | 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 | 0 |
Nonaccrual Loans with an Allowance | 1,018 |
Nonaccrual loans | 1,018 | 1,333
Consumer loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual Loans with No Allowance | 0 |
Nonaccrual Loans with an Allowance | 91 |
Nonaccrual loans | $ 91 | $ 180

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