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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Unamortized premium (discount) on acquired loans | $ (17,300,000) |  |  | $ (24,000,000.0) |  |
Total loans, net of deferred loan costs/(fees) | $ 8,013,538,000 |  |  | $ 8,150,102,000 |  |
Number of loans to debtors with nonperforming loans | loan | 2 |  |  | 1 |  |
Nonperforming loans, commitment to lend | $ 0 |  |  | $ 0 |  |
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 | 122,718,000 | 108,198,000 | $ 110,058,000 | 109,853,000 | $ 109,230,000 | $ 90,967,000
Hurricane |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 755,394,000 |  |  |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | $ 13,000,000.0 |  |  |  |  |
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent | 1.53% |  |  |  |  |
Portions Of Western North And South Carolina | Hurricane |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent | 3.01% |  | 1.29% |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease), Percent | 0.0016 |  |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans, net of deferred loan costs/(fees) | $ 6,600,000,000 |  |  | 6,500,000,000 |  |
Consumer loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | 3,088,000 | 3,010,000 | $ 3,329,000 | 2,992,000 | 2,688,000 | 2,900,000
Consumer loans | Hurricane |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 0 |  |  |  |  |
Commercial and industrial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | 18,143,000 | 22,444,000 | 19,837,000 | 21,227,000 | 23,442,000 | 17,718,000
Commercial and industrial | Hurricane |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | $ 10,481,000 |  |  |  |  |
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Concentration risk percentage | 88.00% |  |  |  |  |
Officers and Directors |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans, net of deferred loan costs/(fees) | $ 63,300,000 |  |  | 63,700,000 |  |
Number of new loans | loan | 1 |  |  |  |  |
Financing receivable, excluding accrued interest, advances | $ 1,300,000 |  |  |  |  |
Repayments received from related parties | 1,600,000 |  |  |  |  |
Officers and Directors | Unused lines of Credit |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable, excluding accrued interest, available credit | 1,000,000.0 |  |  | 2,700,000 |  |
Residential Mortgage Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Presold mortgages in process of settlement | 800,000 |  |  | 1,000,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | 9,277,000 | $ 11,819,000 | $ 9,860,000 | 11,369,000 | $ 13,019,000 | $ 13,306,000
SBA Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Unamortized premium (discount) on acquired loans | $ (3,300,000) |  |  | $ (3,500,000) |  |

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