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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | Changes in the carrying amount of goodwill during the years ended December 31, 2020 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2018 | $ | 930,161 |  |  | $ | 2,767 |  |  | $ | 932,928 |
Measurement period adjustments to goodwill from Brand acquisition | 6,755 |  |  | — |  |  | 6,755 |
Balance at December 31, 2019 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Additions to goodwill and other adjustments | — |  |  | — |  |  | — |
Balance at December 31, 2020 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Summary 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
December 31, 2020 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (53,539) |  |  | $ | 28,953 |
Customer relationship intangible | 2,470 |  |  | (1,284) |  |  | 1,186 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (54,823) |  |  | $ | 30,139 |
December 31, 2019 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (46,599) |  |  | $ | 35,893 |
Customer relationship intangible | 2,470 |  |  | (1,103) |  |  | 1,367 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (47,702) |  |  | $ | 37,260 |
Estimated amortization expense of finite-lived intangible assets for future periods | The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
| Core Deposit Intangible |  | Customer Relationship Intangible |  | Total
2021 | $ | 5,860 |  |  | $ | 181 |  |  | $ | 6,041 |
2022 | 4,940 |  |  | 181 |  |  | 5,121 |
2023 | 4,042 |  |  | 181 |  |  | 4,223 |
2024 | 3,498 |  |  | 181 |  |  | 3,679 |
2025 | 3,102 |  |  | 181 |  |  | 3,283 |

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