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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying amounts of goodwill by operating segments | The carrying amounts of goodwill by operating segments for the six months ended June 30, 2021 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2021 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Additions to goodwill and other adjustments | — |  |  | — |  |  | — |
Balance at June 30, 2021 | $ | 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
June 30, 2021 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (56,584) |  |  | $ | 25,908 |
Customer relationship intangible | 2,470 |  |  | (1,375) |  |  | 1,095 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (57,959) |  |  | $ | 27,003 |
December 31, 2020 |  |  |  |  |
Core deposit intangibles | $ | 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 |
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 |  | Six Months Ended
| June 30, |  | June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,494 |  |  | $ | 1,789 |  |  | $ | 3,046 |  |  | $ | 3,639 |
Customer relationship intangible | 45 |  |  | 45 |  |  | 91 |  |  | 90 |
Total intangible amortization | $ | 1,539 |  |  | $ | 1,834 |  |  | $ | 3,137 |  |  | $ | 3,729 |
Estimated amortization expense of finite-lived intangible assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2021 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2021 | $ | 5,860 |  |  | $ | 181 |  |  | $ | 6,041 |
2022 | 4,940 |  |  | 181 |  |  | 5,121 |
2023 | 4,044 |  |  | 181 |  |  | 4,225 |
2024 | 3,498 |  |  | 181 |  |  | 3,679 |
2025 | 3,103 |  |  | 181 |  |  | 3,284 |

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