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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 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 6,064,698 | $ 6,081,715
Nonaccrual loans | 33,460 | 34,696
Unamortized net deferred loan fees | (928) | (1,704)
Total loans | 6,065,626 | 6,083,419
Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,908 | 11,763
Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 295 | 3,263
Accruing 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 1,004
Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,017,963 | 6,032,693
Commercial, financial, and agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 12,572 | 12,152
Total loans | 603,454 | 648,997
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 389 | 377
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 105 | 93
Commercial, financial, and agricultural | Accruing 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Commercial, financial, and agricultural | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 590,388 | 636,375
Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 603,454 | 648,997
Real estate, commercial | Real estate – construction, land development & other land loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 1,054 | 632
Total loans | 795,886 | 828,549
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,492 | 4,046
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
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] |  |
Loans | 0 | 286
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 793,340 | 823,585
Real estate, commercial | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 795,886 | 828,549
Real estate, commercial | Real estate – mortgage – commercial and other |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 15,216 | 16,231
Total loans | 3,234,949 | 3,194,737
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,294 | 164
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 1,496
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,217,439 | 3,176,846
Real estate, commercial | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,234,949 | 3,194,737
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 3,720 | 4,898
Total loans | 1,045,167 | 1,021,966
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,739 | 6,571
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20 | 1,488
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] |  |
Loans | 0 | 0
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,032,688 | 1,009,009
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,045,167 | 1,021,966
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 807 | 694
Total loans | 329,348 | 331,932
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 891 | 489
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36 | 124
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] |  |
Loans | 0 | 718
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 327,614 | 329,907
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 329,348 | 331,932
Consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 91 | 89
Total loans | 56,822 | 57,238
Consumer loans | Accruing 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 103 | 116
Consumer loans | Accruing 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 134 | 62
Consumer loans | Accruing 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Consumer loans | Accruing Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 56,494 | 56,971
Consumer loans | Loans, Excluding Purchased Credit Impaired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 56,822 | $ 57,238

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