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Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | $ 31,268 | $ 35,076 |
Loans, gross | 4,873,230 | 4,735,013 | $ 4,819,175
Unamortized net deferred loan fees | (3,389) | (3,698) | (5,439)
Total loans | 4,869,841 | 4,731,315 | 4,813,736
Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 2,331 | 16,318 |
Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 1,233 | 5,271 |
Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 719 |
Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 4,838,398 | 4,677,629 |
Purchased credit impaired |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 0 |
Loans, gross |  | 8,591 |
Purchased credit impaired | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 328 |
Purchased credit impaired | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 112 |
Purchased credit impaired | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 719 |
Purchased credit impaired | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans |  | 7,432 |
Commercial, financial, and agricultural |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 9,529 | 9,681 |
Loans, gross | 612,554 | 782,549 | 804,831
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 584 | 1,464 |
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 60 | 1,101 |
Commercial, financial, and agricultural | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Commercial, financial, and agricultural | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 602,381 | 770,166 |
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 373 | 643 |
Loans, gross | 588,103 | 570,672 | 653,120
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 572 |
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 587,730 | 569,307 |
Real estate, commercial | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 15,923 | 17,191 |
Loans, gross | 2,423,341 | 2,049,203 | 1,983,622
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 346 | 2,540 |
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 334 | 3,111 |
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 2,406,738 | 2,022,422 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 4,334 | 6,048 |
Loans, gross | 914,266 | 972,378 | 1,017,087
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 668 | 10,146 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 738 | 869 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 908,526 | 951,088 |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 1,018 | 1,333 |
Loans, gross | 281,219 | 306,256 | 310,326
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 606 | 1,088 |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 67 | 42 |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 279,528 | 303,693 |
Consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 91 | 180 |
Loans, gross | 53,747 | 53,955 | $ 50,189
Consumer loans | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 127 | 180 |
Consumer loans | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 34 | 36 |
Consumer loans | Accruing 90 Days or More Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 0 | 0 |
Consumer loans | Accruing Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 53,495 | 53,521 |
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 612,554 | 782,412 |
Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 588,103 | 570,522 |
Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 2,423,341 | 2,045,264 |
Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 914,266 | 968,151 |
Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 281,219 | 306,156 |
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | $ 53,747 | $ 53,917 |

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