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Loans and Asset Quality Information - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | $ 35,076 | $ 24,866
Commercial, financial, and agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | 9,681 | 5,518
Real estate, commercial | Real estate – construction, land development & other land loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | 643 | 1,067
Real estate, commercial | Real estate – mortgage – commercial and other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | 17,191 | 8,820
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | 6,048 | 7,552
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | 1,333 | 1,797
Installment loans to individuals |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Nonaccrual loans | $ 180 | $ 112

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