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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 | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans, gross |  | $ 4,786,846 | $ 4,735,013 | $ 4,776,911
Unamortized net deferred loan fees |  | (4,782) | (3,698) | (6,848)
Loans |  | $ 4,782,064 | 4,731,315 | 4,770,063
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 |  | $ 158,695 | 169,662 |
SBA Loans, Guaranteed Portion |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  | 32,315 | 33,959 |
SBA Loans, Unguaranteed Portion |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  | 126,380 | 135,703 |
SBA Loans, Sold Portion |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  | 426,940 | 395,398 |
Commercial, financial, and agricultural |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans, gross |  | $ 704,096 | 782,549 | 723,053
Commercial, financial, and agricultural | Loan Category Concentration Risk | Financing Receivable |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Percentage | 17.00% | 15.00% |  |
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans, gross |  | $ 566,417 | 570,672 | 648,590
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 |  | $ 2,262,492 | 2,049,203 | 1,959,078
Real estate, commercial | Real estate – mortgage – commercial and other | Loan Category Concentration Risk | Financing Receivable |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Percentage | 43.00% | 47.00% |  |
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans, gross |  | $ 914,318 | 972,378 | 1,076,411
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 | 21.00% | 19.00% |  |
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans, gross |  | $ 285,595 | 306,256 | 318,618
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 |  | $ 53,928 | $ 53,955 | $ 51,161
Consumer loans | Loan Category Concentration Risk | Financing Receivable |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Percentage | 1.00% | 1.00% |  |

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