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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details) |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2023 USD ($) | Sep. 30, 2023 USD ($) loan | Sep. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) loan | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Unamortized discount on acquired loans |  | $ (26,500,000) |  |  | $ (11,600,000) |  |
Total loans, net of deferred loan fees |  | $ 8,027,037,000 |  |  | $ 6,665,145,000 |  |
Number of loans to debtors with nonperforming loans | loan |  | 2 |  |  | 1 |  |
Nonperforming loans, commitment to lend |  | $ 100,000 |  |  |  |  |
Interest income on nonaccrual loans |  | 0 | $ 0 |  |  |  |
Non accrual individually evaluated loan threshold |  | 500,000 |  |  |  |  |
Collateral dependent individually evaluated loan threshold |  | 500,000 |  |  |  |  |
Allowance for credit losses on loans |  | 108,198,000 | 86,587,000 | $ 109,230,000 | $ 90,967,000 | $ 82,181,000 | $ 78,789,000
GrandSouth |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | $ 5,610,000 |  |  |  |  |  |
Allowance for credit loss, increase from acquisition, non-PCD | $ 12,200,000 |  |  |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Total loans, net of deferred loan fees |  | 6,400,000,000 |  |  | 5,300,000,000 |  |
Consumer loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  | 3,010,000 | 2,818,000 | 2,688,000 | 2,900,000 | 2,630,000 | 2,656,000
Commercial and industrial |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  | $ 22,444,000 | 17,586,000 | $ 23,442,000 | 17,718,000 | $ 15,450,000 | 16,249,000
Real Estate |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 90.00% |  |  |  |  |
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 88.00% |  |  |  |  |
Hotel | Minimum |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans |  | 10.00% |  |  |  |  |
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, net of deferred loan fees |  | $ 5,500,000 |  |  | 6,000,000 |  |
Number of new loans | loan |  | 2 |  |  |  |  |
Financing receivable, excluding accrued interest, advances |  | $ 45,000 |  |  |  |  |
Repayments received from related parties |  | 500,000 |  |  |  |  |
Officers and Directors | Unused lines of Credit |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Financing receivable, excluding accrued interest, available credit |  | 1,300,000 |  |  | 1,200,000 |  |
Residential Mortgage Loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Presold mortgages in process of settlement |  | 3,200,000 |  |  | 800,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  | 11,819,000 | $ 12,306,000 |  | 13,306,000 |  | $ 13,506,000
SBA Loans |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Unamortized discount on acquired loans |  | $ (3,600,000) |  |  | $ (4,300,000) |  |

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