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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 6,065,626 | $ 6,083,419
Unamortized net deferred loan fees | (928) | (1,704)
Total loans | $ 6,064,698 | $ 6,081,715
Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 100.00% | 100.00%
Total non-PPP SBA loans included in the table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | $ 159,960 | $ 171,149
Guaranteed portions of non-PPP SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 33,024 | 48,377
Unguaranteed portions of non-PPP SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 126,936 | 122,772
Sold portions of SBA loans with servicing retained - not included in tables above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 426,601 | 414,240
Commercial, financial, and agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 603,454 | $ 648,997
Commercial, financial, and agricultural | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 10.00% | 11.00%
Real estate, commercial | Real estate – construction, land development & other land loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 795,886 | $ 828,549
Real estate, commercial | Real estate – construction, land development & other land loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 13.00% | 13.00%
Real estate, commercial | Real estate – mortgage – commercial and other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 3,234,949 | $ 3,194,737
Real estate, commercial | Real estate – mortgage – commercial and other | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 53.00% | 53.00%
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 1,045,167 | $ 1,021,966
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 17.00% | 17.00%
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 329,348 | $ 331,932
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 6.00% | 5.00%
Consumer loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 56,822 | $ 57,238
Consumer loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 1.00% | 1.00%

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