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Loans and Asset Quality Information - Schedule of Recorded Investment in Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | $ 4,735,013 | $ 4,451,525 | $ 4,247,765
Unamortized net deferred loan costs | (3,698) | 1,941 | 1,299
Total loans | 4,731,315 | 4,453,466 | 4,249,064
PCI Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 8,591 | 12,664 |
Commercial, financial, and agricultural |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 782,549 | 504,271 | 457,037
Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 782,412 | 504,058 |
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 570,672 | 530,866 | 518,976
Real estate, commercial | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 2,049,203 | 1,917,280 | 1,787,022
Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 570,522 | 530,700 |
Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 2,045,264 | 1,910,650 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 972,378 | 1,105,014 | 1,054,176
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 306,256 | 337,922 | 359,162
Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 968,151 | 1,099,671 |
Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 306,156 | 337,699 |
Installment loans to individuals |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 53,955 | 56,172 | $ 71,392
Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 53,917 | 56,083 |
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 4,613,259 | 4,338,381 |
Pass | PCI Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 6,901 | 8,098 |
Pass | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 762,091 | 486,081 |
Pass | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 560,845 | 522,767 |
Pass | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,988,684 | 1,873,594 |
Pass | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 943,455 | 1,063,735 |
Pass | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 297,795 | 328,903 |
Pass | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 53,488 | 55,203 |
Special Mention Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 61,260 | 50,321 |
Special Mention Loans | PCI Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 85 | 2,590 |
Special Mention Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 9,553 | 7,998 |
Special Mention Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 7,877 | 4,075 |
Special Mention Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 34,588 | 20,800 |
Special Mention Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 7,609 | 13,187 |
Special Mention Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,468 | 1,258 |
Special Mention Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 80 | 413 |
Classified Accruing Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 25,418 | 37,957 |
Classified Accruing Loans | PCI Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,605 | 1,976 |
Classified Accruing Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,087 | 4,461 |
Classified Accruing Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,157 | 2,791 |
Classified Accruing Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 4,801 | 7,436 |
Classified Accruing Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 11,039 | 15,197 |
Classified Accruing Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 5,560 | 5,741 |
Classified Accruing Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 169 | 355 |
Classified Nonaccrual Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 35,076 | 24,866 |
Classified Nonaccrual Loans | PCI Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 0 | 0 |
Classified Nonaccrual Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 9,681 | 5,518 |
Classified Nonaccrual Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 643 | 1,067 |
Classified Nonaccrual Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 17,191 | 8,820 |
Classified Nonaccrual Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 6,048 | 7,552 |
Classified Nonaccrual Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 1,333 | 1,797 |
Classified Nonaccrual Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | $ 180 | $ 112 |

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