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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) loan | Sep. 30, 2022 USD ($) loan | Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
PPP loans |  |  | $ 39,000,000 |  |  |  |
Total loans | $ 6,525,286,000 | $ 6,525,286,000 | 6,081,715,000 |  |  |  |
Unamortized discount on acquired loans | 12,500,000 | 12,500,000 | 17,200,000 |  |  |  |
Interest income on nonaccrual loans |  | 0 | 0 |  |  |  |
Financing receivable, revolving, converted to term loan during period | 2,400,000 | 4,600,000 |  |  |  |  |
Allowance for credit losses on loans | 86,587,000 | 86,587,000 | 78,789,000 | $ 82,181,000 | $ 63,628,000 | $ 65,022,000 | $ 52,388,000
Asset Pledged as Collateral |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Total loans | $ 5,200,000,000 | $ 5,200,000,000 | 4,300,000,000 |  |  |  |
Troubled Debt Restructuring |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Number of loans modified as TDR with commitments to lend funds | loan | 1 | 1 |  |  |  |  |
Commitment value for loans modified as TDR |  |  | 0 |  |  |  |
Consumer loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 2,818,000 | $ 2,818,000 | 2,656,000 | 2,630,000 | 2,369,000 | 2,363,000 | 1,478,000
Commercial, financial, and agricultural |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 17,586,000 | $ 17,586,000 | 16,249,000 | $ 15,450,000 | $ 13,500,000 | $ 14,809,000 | $ 11,316,000
Real Estate |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 90.00% |  |  |  |  |
Real Estate | Receivable Benchmark | Receivable Type Concentration Risk |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 90.00% |  |  |  |  |
Hotel | Minimum |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 1000.00% |  |  |  |  |
Hotel | Maximum |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 25.00% |  |  |  |  |
Non Real Estate |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 75.00% |  |  |  |  |
Officers and Directors |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Total loans | 5,800,000 | $ 5,800,000 |  |  |  |  |
Due from related parties | 6,100,000 | 6,100,000 | 600,000 |  |  |  |
Advances to related parties |  | 38,000 |  |  |  |  |
Repayments received from related parties |  | 400,000 |  |  |  |  |
Credit Card Loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Total loans | 42,000,000 | $ 42,000,000 | 37,900,000 |  |  |  |
Credit Card Loans | Receivable Benchmark | Receivable Type Concentration Risk | Consumer loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 57.00% |  |  |  |  |
Credit Card Loans | Receivable Benchmark | Receivable Type Concentration Risk | Commercial, financial, and agricultural |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 43.00% |  |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Presold mortgages in process of settlement | 1,700,000 | $ 1,700,000 | 1,500,000 |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | 12,306,000 | 12,306,000 | 13,506,000 |  |  |  |
SBA Loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Unamortized discount on acquired loans | $ 4,600,000 | $ 4,600,000 | $ 6,000,000.0 |  |  |  |

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