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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Amounts of Goodwill by Operating Segments | The carrying amounts of goodwill by operating segments for the nine months ended September 30, 2023 are set forth in the table below. The deduction from goodwill resulted from measurement period adjustments following the RBC acquisition and is primarily related to adjustments on the fair value of other liabilities.
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2023 | $ | 988,941 |  |  | $ | 2,767 |  |  | $ | 991,708 |
Deductions to goodwill and other adjustments | (43) |  |  | — |  |  | (43) |
Balance at September 30, 2023 | $ | 988,898 |  |  | $ | 2,767 |  |  | $ | 991,665 |
Schedule of Finite-Lived Intangible Assets | The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
September 30, 2023 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (67,443) |  |  | $ | 15,049 |
Customer relationship intangible | 7,670 |  |  | (2,649) |  |  | 5,021 |
Total finite-lived intangible assets | $ | 90,162 |  |  | $ | (70,092) |  |  | $ | 20,070 |
December 31, 2022 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (64,339) |  |  | $ | 18,153 |
Customer relationship intangible | 7,670 |  |  | (1,647) |  |  | 6,023 |
Total finite-lived intangible assets | $ | 90,162 |  |  | $ | (65,986) |  |  | $ | 24,176 |
Schedule of Current Year Amortization Expense for Finite-Lived Intangible Assets | Current year amortization expense for finite-lived intangible assets is presented in the table below.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 977 |  |  | $ | 1,206 |  |  | $ | 3,103 |  |  | $ | 3,791 |
Customer relationship intangible | 334 |  |  | 45 |  |  | 1,003 |  |  | 136 |
Total intangible amortization | $ | 1,311 |  |  | $ | 1,251 |  |  | $ | 4,106 |  |  | $ | 3,927 |
Schedule of Estimated Amortization Expense of Finite-Lived Intangible Assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2023 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2023 | $ | 4,043 |  |  | $ | 1,337 |  |  | $ | 5,380 |
2024 | 3,498 |  |  | 1,192 |  |  | 4,690 |
2025 | 3,102 |  |  | 1,048 |  |  | 4,150 |
2026 | 2,899 |  |  | 860 |  |  | 3,759 |
2027 | 2,774 |  |  | 628 |  |  | 3,402 |

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