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Loans, Allowance for Credit Losses, and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 4,873,230 | $ 4,735,013 | $ 4,819,175
Unamortized net deferred loan fees | (3,389) | (3,698) | (5,439)
Loans | $ 4,869,841 | $ 4,731,315 | 4,813,736
Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 100.00% | 100.00% |
SBA Loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans | $ 151,060 | $ 169,662 |
SBA Loans, Guaranteed Portion |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans | 27,542 | 33,959 |
SBA Loans, Unguaranteed Portion |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans | 123,518 | 135,703 |
SBA Loans, Sold Portion |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans | 424,662 | 395,398 |
Commercial, financial, and agricultural |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 612,554 | $ 782,549 | 804,831
Commercial, financial, and agricultural | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 12.00% | 17.00% |
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 588,103 | $ 570,672 | 653,120
Real estate, commercial | Real estate – construction, land development & other land loans | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 12.00% | 12.00% |
Real estate, commercial | Real estate – mortgage – commercial and other |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 2,423,341 | $ 2,049,203 | 1,983,622
Real estate, commercial | Real estate – mortgage – commercial and other | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 50.00% | 43.00% |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 914,266 | $ 972,378 | 1,017,087
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 19.00% | 21.00% |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 281,219 | $ 306,256 | 310,326
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 6.00% | 6.00% |
Consumer loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans, gross | $ 53,747 | $ 53,955 | $ 50,189
Consumer loans | Loan Category Concentration Risk | Financing Receivable |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Percentage | 1.00% | 1.00% |

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