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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, 2023 | Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 7,800,239 | $ 6,666,548
Unamortized net deferred loan fees | (1,276) | (1,403)
Loans | $ 7,798,963 | $ 6,665,145
Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 100.00% | 100.00%
Total SBA loans included in the table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 151,448 | $ 148,803
Guaranteed portions of SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 36,035 | 31,893
Unguaranteed portions of SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 115,413 | 116,910
Sold portions of SBA loans with servicing retained - not included in tables above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 380,634 | 392,370
Commercial, financial, and agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 885,032 | $ 641,941
Commercial, financial, and agricultural | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 11.00% | 9.00%
Real estate, commercial | Real estate – construction, land development & other land loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 1,092,026 | $ 934,176
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 | 14.00% | 14.00%
Real estate, commercial | Real estate mortgage – commercial and other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 4,026,258 | $ 3,510,261
Real estate, commercial | Real estate mortgage – commercial and other | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 52.00% | 53.00%
Real estate, mortgage | Real estate mortgage – residential (1-4 family) first mortgages |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 1,386,580 | $ 1,195,785
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 | 18.00% | 18.00%
Real estate, mortgage | Real estate mortgage – home equity loans / lines of credit |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 342,287 | $ 323,726
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 | 4.00% | 5.00%
Consumer loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 68,056 | $ 60,659
Consumer loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 1.00% | 1.00%

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