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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 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | $ 32,993 | $ 35,076 |
Loans, gross | 4,786,846 | 4,735,013 | $ 4,776,911
Unamortized net deferred loan fees | (4,782) | (3,698) | (6,848)
Total loans | 4,782,064 | 4,731,315 | 4,770,063
Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 3,354 | 16,318 |
Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 859 | 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 | 4,749,640 | 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 | 9,476 | 9,681 |
Loans, gross | 704,096 | 782,549 | 723,053
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 634 | 1,464 |
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 33 | 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 | 693,953 | 770,166 |
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 393 | 643 |
Loans, gross | 566,417 | 570,672 | 648,590
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 | 65 | 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 | 565,959 | 569,307 |
Real estate, commercial | Real estate – mortgage – commercial and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 15,886 | 17,191 |
Loans, gross | 2,262,492 | 2,049,203 | 1,959,078
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 1,425 | 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 | 0 | 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 | 2,245,181 | 2,022,422 |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 5,765 | 6,048 |
Loans, gross | 914,318 | 972,378 | 1,076,411
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 | 672 | 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 | 610 | 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 | 907,271 | 951,088 |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 1,345 | 1,333 |
Loans, gross | 285,595 | 306,256 | 318,618
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 | 474 | 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 | 159 | 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 | 283,617 | 303,693 |
Consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | 128 | 180 |
Loans, gross | 53,928 | 53,955 | $ 51,161
Consumer loans | Accruing 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 84 | 180 |
Consumer loans | Accruing 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans | 57 | 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 | 53,659 | 53,521 |
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | 704,096 | 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 | 566,417 | 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 | 2,262,492 | 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 | 914,318 | 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 | 285,595 | 306,156 |
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, gross | $ 53,928 | $ 53,917 |

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